Recorder
Abstract
Problem to be solved.To reduce fluctuation of head-paper distance and reduction of cock ring height, and prevent ink droplets from landing and shifting.
Solution.A plurality of convex portions 9 and concave portions 10 extending in a sheet transport direction are alternately arranged on a platen 7. The wavy holding spur 11 is rotatably supported by the torsion coil spring 12 downstream of the recording region and is pressed against the recess 10. A paper ejection roller pair 13 is provided substantially downstream of the convex portion 9. The recording sheet S rises toward the recording head 1 due to the cock ring caused by swelling, but since a considerable amount is absorbed by the recess 10, it does not come into contact with the recording head 1 and is PP (abbreviation of peak to peak). Is also kept low. After the tip of the recording sheet S passes through the paper ejection roller pair 13, the mountain of the cock ring is crushed by the transport spur 13b, and the PP is further lowered by being divided between the wavy holding spur 11 and the transport spur 13b. [Selection diagram] Fig. 1
Term
Term ended
Projected expiry passed 17 September 2022, 4 years ago.
- Priority and filed
- Published
- Projected expiry
- Today
20 claims: 7 independent, 13 dependent
- 1記録シートを搬送する搬送手段と、前記記録シートに記録を行う記録ヘッドと対向する位置に配置され、前記記録シートの搬送方向に延びる複数の凹部および凸部が形成されたプラテンとを具備した記録装置において、前記記録ヘッドの搬送方向下流で、かつ前記各凹部に対向する位置に圧接して配置されている回転可能な回転体を有することを特徴とする記録装置。
- 2前記記録ヘッドの搬送方向下流で、かつ前記各凸部に対向する位置に圧接して配置されている回転可能な回転体を有する、請求項1に記載の記録装置。
- 3前記回転体が配置された位置における、前記各凸部と前記各凹部との段差が少なくとも0.5mm以下である、請求項1または2に記載の記録装置。
- 4記録シートを搬送する搬送手段と、前記記録シートに記録を行う記録ヘッドと対向する位置に配置され、前記記録シートの搬送方向に延び、高さが最も高い突起からなる複数の第1の突起、および前記各第1の突起より高さの低い突起からなる複数の第2の突起を含む、少なくとも2種類以上の異なる高さの突起群を有するプラテンとを具備した記録装置において、前記記録ヘッドの搬送方向下流で、前記各第2の突起の少なくとも1種類に圧接して配置されている回転可能な回転体を有することを特徴とする記録装置。
- 5前記記録ヘッドの搬送方向下流で、前記各第1の突起に対向する位置に圧接して配置されている回転可能な回転体を有する、請求項4に記載の記録装置。
- 6前記各第1の突起と、前記各第2の突起のうち前記回転体が圧接された突起との段差が、少なくとも0.5mm以下である、請求項4または5に記載の記録装置。
- 7前記記録ヘッドと対向する位置に配置されたプラテンに、前記記録シートの搬送方向に延びて設けられた、複数の凹部、複数の凸部、高さが最も高い突起からなる複数の第1の突起、および前記各第1の突起より高さの低い突起からなる複数の第2の突起のうち前記回転体の圧接される箇所が、前記プラテンに回転可能に支持されたコロ部材で形成されており、該コロ部材の外周上部は、その搬送方向上流と略同一高さを有する、請求項1から6のいずれか1項に記載の記録装置。
- 8記録シートを搬送する搬送手段と、前記記録シートに記録を行う記録ヘッドと対向する位置に配置され、前記記録シートの搬送方向に延びる複数の凹部および凸部を有するプラテンとを具備した記録装置において、前記記録ヘッドの搬送方向下流で、かつ前記各凹部に対向する位置に配置され、少なくとも高さ方向に弾性移動可能に支持された回転可能な回転体を有するとともに、該回転体が対向する前記各凹部には前記回転体が接触しないようにスリットが形成されており、前記記録シートが無い状態で、前記回転体の外周下部が、前記各凹部と略同一高さ、および前記スリット内のいずれかの位置するように保持されていることを特徴とする記録装置。
- 9前記記録ヘッドの搬送方向下流で、かつ前記プラテンの複数の凸部に対向する位置に配置され、少なくとも高さ方向に弾性移動可能に支持された回転可能な別の回転体を有するとともに、該別の回転体が対向する前記各凸部には前記別の回転体が接触しないように別のスリットが形成されており、前記記録シートが無い状態で、前記別の回転体の外周下部が、前記各凸部と略同一高さ、および前記別のスリット内のいずれかに位置するように保持されている、請求項8に記載の記録装置。
- 10前記別の回転体が配置された位置における前記各凸部と、前記スリットが形成された前記各凹部との段差が、少なくとも0.5mm以下である、請求項8または9に記載の記録装置。
- 11前記記録ヘッドの搬送方向下流に位置する搬送手段が、前記各凸部の略搬送方向下流に記録シートを挟持して搬送する搬送ローラ対を有する、請求項1から3、7から10のいずれか1項に記載の記録装置。
- 12記録シートを搬送する搬送手段と、前記記録シートに記録を行う記録ヘッドと対向する位置に配置され、前記記録シートの搬送方向に延び、高さが最も高い突起からなる複数の第1の突起と、前記各第1の突起より高さの低い突起からなる複数の第2の突起とを含む、少なくとも2種類以上の異なる高さの突起群を有するプラテンとを具備した記録装置において、前記記録ヘッドの搬送方向下流で、前記各第2の突起の少なくとも1種類に対向する位置に配置され、少なくとも高さ方向に弾性移動可能に支持された回転可能な回転体を有するとともに、該回転体が対向する前記突起群の突起には、前記回転体が接触しないようにスリットが形成されており、前記記録シートが無い状態で、前記回転体の外周下部が、前記回転体が対向する前記突起群の突起と略同一高さ、および前記スリット内のいずれかに位置するように保持されていることを特徴とする記録装置。
- 13前記記録ヘッドの搬送方向下流で、前記第1の突起に対向する位置に配置され、少なくとも高さ方向に弾性移動可能に支持された回転可能な別の回転体を有するとともに、該別の回転体が対向する前記突起群の突起には、前記別の回転体が接触しないように別のスリットが形成されており、前記記録シートが無い状態で、前記別の回転体の外周下部が、前記別の回転体が対向する前記突起群の突起と略同一高さ、および前記別のスリット内のいずれかに位置するように保持されている、請求項12に記載の記録装置。
- 14前記別の回転体が配置された前記各第1の突起と、前記各第2の突起のうち前記スリットが設けられた各突起との段差が、少なくとも0.5mm以下である、請求項12または13に記載の記録装置。
- 15前記回転体および前記別の回転体のそれぞれに対向する溝形状のスリット部が形成されたコロ部材が、前記プラテンに回転可能に支持されており、前記コロ部材の溝形状の両側部が、前記プラテンの搬送方向上流の面と略同一高さに位置している、請求項8から10、12から14のいずれか1項に記載の記録装置。
- 16前記記録ヘッドの搬送方向下流に位置する搬送手段が、前記第1の突起の略搬送方向下流に、記録シートを挟持して搬送する搬送ローラ対を有する、請求項4から7、12から15のいずれか1項に記載の記録装置。
- 17前記プラテンが、前記記録シートの搬送方向に延びる複数の凹部および凸部を有しており、前記記録ヘッドの搬送方向上流に、前記記録シートに対して前記凸部で山となり、前記凹部で谷となる波打ち形状を付与する波打ち形状付与手段を有する、請求項1から16に記載の記録装置。
- 18前記波打ち形状付与手段が、前記記録ヘッドの搬送方向上流に位置する搬送ローラ対と前記凸部および前記凹部とを有し、前記搬送ローラ対のニップ位置が、前記凸部よりも上方に位置し、かつ前記搬送ローラ対のうち前記記録シートの非記録面に当接するローラに対して、もう一方の記録面に当接するローラが前記記録ヘッド側にオフセットして配置されていることにより、前記記録シートを前記プラテンに押し付ける構成である、請求項17に記載の記録装置。
- 19前記波打ち形状付与手段が、前記凸部および凹部に記録シートを導くためのシートガイド部材であり、前記記録シートを前記凹部に導くための突起部を有している、請求項17に記載の記録装置。
- 20前記シートガイド部材の突起部が弾性変形可能である、請求項19に記載の記録装置。
Independent claims20
190 paragraphs in 1 section, as filed
【0001】
[Technical field to which the invention belongs]
The present invention relates to an apparatus for recording on a sheet by a recording means, and more particularly to a configuration of an inkjet recording apparatus for ejecting ink droplets from an inkjet recording means to perform recording in a recording area and before and after the recording area.
【0002】
[Conventional technology]
Inkjet recording equipment eliminates the effects of wrinkles and wavy shapes (hereinafter referred to as cock rings) that occur when ink is applied to a recording sheet, which is a recording medium, as much as possible in order to perform stable recording. It is necessary to prevent the recording sheet that is curled due to the influence of the above from floating toward the recording head so that the distance between the surface of the recording sheet and the recording head is maintained. This is because when the floating of the recording sheet becomes high enough to come into contact with the recording head, the ink droplets adhering to the recording head are transferred and the unfixed ink applied to the recording sheet itself is rubbed. This causes the recording sheet to become dirty, and at the same time, causes problems such as clogging of the ink ejection port itself of the recording head.
【0003】
Conventionally, techniques for solving the above-mentioned problems have been disclosed (see, for example, Patent Document 1 and Patent Document 2).
【0004】
[Patent Document 1]
Japanese Unexamined Patent Publication No. 2000-071532 [Patent Document 2]
Japanese Unexamined Patent Publication No. 2000-158644 First, a first conventional example relating to Patent Document 1 will be described with reference to FIGS. 12 and 13.
【0005】
The inkjet recording apparatus 100 has a transport roller 102, which is a sheet transport means, upstream of the recording sheet transport direction of the recording head 101, and a pinch roller 103, which is pressed against the sheet and rotates in a driven manner, and a discharge roller 104 downstream of the sheet transport direction. And, it has a paper ejection spur 105 that is pressed against it and rotates in a driven manner. Further, a platen 106 for guiding the back surface of the recording sheet S is provided at a position facing the recording head 101, and a plurality of ribs 107 for forming waviness in the sheet material width direction of the recording sheet S are formed on the upper surface of the platen 106. Recesses 108 are formed alternately. A sheet material holding plate 110 having protrusions 109 for guiding the recording sheet S is installed in each recess 108 upstream of the platen 106 in the recording sheet transport direction. Further, downstream of the recess 108 in the recording sheet transport direction, a wavy holding spur 112 for pressing the recording sheet S in each recess 108 direction is similarly installed. Further, the paper ejection roller 104 and the paper ejection spur 105 described above are located downstream in the sheet transport direction of each rib 107 of the platen 106, and the height of the nip formed by the paper ejection roller 104 and the paper ejection spur 105 is the rib 107. It is arranged at almost the same height as.
【0006】
In the above configuration, the behavior of the recording sheet S on the platen 106 will be described with reference to FIG. 13, which is a view taken along the line D of FIG.
【0007】
The recording sheet S that has passed through the sheet material holding plate 110 is given a wavy shape as shown by the solid line S5 in FIG. At this time, when the recorded image has a high density, a large amount of recording ink using water as the main solvent is injected, and the recording sheet S swells. Here, since the apex of the wavy shape of the recording sheet S is pressed by the rib 107 and the horizontal portion 111 of the sheet material holding plate 110 immediately before the recording area, it is difficult to move due to swelling. On the contrary, since the movement is not regulated in the plurality of recesses 108, the extension due to the swelling of the recording sheet S mainly occurs in the recesses 108. Since the cock ring is reliably displaced downward by the protrusion 109, the recording sheet S after recording becomes like S6 shown by the broken line in FIG. Then, when the recording sheet S on which the cock ring as shown in S6 is formed in the recording area is further conveyed, the paper ejection roller 104 and the paper ejection accelerating 105 are maintained in the state of the cock ring by the wavy holding accelerating 112. Since these paper ejection roller pairs are arranged downstream of the plurality of ribs 107, they are located at the ridges of the cock ring and also maintain the cock ring state.
【0008】
In addition, although the recording sheet S is curled due to the atmospheric environment, the recording sheet S is given a wavy shape upstream of the recording area, and the wavy holding spur even after the rear end of the recording sheet S passes through the sheet material holding plate 110. The wavy shape is maintained by 112. Therefore, the stiffness of the recording sheet S becomes stronger and the curl is corrected, so that the recording sheet S is prevented from floating on the recording head 101 side.
【0009】
Next, a second conventional example related to Patent Document 2 will be described with reference to FIGS. 14 to 16. In addition, here, the same description as in the first conventional example omits duplicate description.
【0010】
The inkjet recording apparatus 200 has a transport roller 202, which is a sheet transport means, upstream of the recording sheet transport direction of the recording head 201, and a pinch roller 203 that is pressed against the sheet and rotates in a driven manner, and a discharge roller 204 downstream of the sheet transport direction. It has a paper ejection spur 205 that is pressed against it and rotates in a driven manner. Further, a platen 206 for guiding the back surface of the recording sheet S is provided at a position facing the recording head 201, and a plurality of ribs 207 for forming waviness in the sheet material width direction of the recording sheet S are formed on the upper surface of the platen 206. , A plurality of auxiliary ribs 208 having a height lower than that of the rib 207 are provided. The transfer roller 202 and the pinch roller 203 located upstream of the platen 206 in the recording sheet transfer direction are such that the pinch roller 203 is in the platen 206 direction with respect to the transfer roller 202 as shown in FIG. 15 which is an EE cross-sectional view of FIG. It is arranged offset and is configured such that its nip position is above the rib 207. Therefore, the recording sheet S is conveyed so as to be pressed against the rib 207 from diagonally above, and as shown in the solid line S7 of FIG. 16 which is the F arrow view of FIG. 14, the rib 207 is between the mountain and the rib 207. A wavy shape that becomes a valley is given. Further, the above-mentioned paper ejection roller 204 and paper ejection spur 205 are located downstream in the sheet transport direction of each rib 207 of the platen 206, and similarly, the recording sheet S is placed between the ribs 207 downstream in the recording sheet transport direction between the ribs 207. , And a wavy holding spur 209 for holding between the paper ejection rollers 204 is installed.
【0011】
In the above configuration, as shown in FIG. 16, the behavior of the recording sheet S on the platen 206 becomes a wavy shape like S7 shown by the solid line before recording by the recording head 201, and a high-density recorded image. When is recorded, an extension due to swelling of the recording sheet S occurs between the rib 207 and the auxiliary rib 208 toward the direction away from the recording head 201, as shown by the broken line S8.
【0012】
[Problems to be Solved by the Invention]
However, in the configuration shown in the conventional example, the first problem is that the depth of the wavy valleys given to the recording sheet changes before and after the tip portion of the recording sheet reaches the wavy holding spur. Be done. This is because the wavy shape (depth of peaks and valleys) formed by the offset of the sheet material holding plate 110 and the pinch roller 203 with respect to the transport roller 202 upstream of the recording head naturally differs depending on the difference in the thickness and rigidity of the recording sheet. In addition, it varies depending on the location depending on the density of fibers in one sheet. However, the height of the wavy holding spurs (112, 209) is placed lower than the ribs 107 and 207 in consideration of parts tolerances and mounting tolerances in order to surely push the recording sheet between the ribs 107 and 207. ing. Therefore, in many cases, the depth of the valley will increase after the tip of the recording sheet reaches the wavy holding spur. Further, here, the wavy holding spur 209 is rotatably supported by a torsion coil spring 210 so as to be elastically movable, and is configured to be movable in the height direction to some extent due to the rigidity of the recording sheet. Since it is provided to give a shape, its influence cannot be completely eliminated.
【0013】
As a result, before and after the tip of the recording sheet reaches the wavy holding spur, the distance from the recording head to the recording surface of the recording sheet changes, and when forming an image, scanning of the recording head is performed in the same manner as multiple paper feeds. In repeated multi-pass recording and the like, the landing position of the ink droplets may be displaced, resulting in color deviation of the image and a feeling of roughness.
【0014】
As a second problem, when a high-density recorded image is recorded on the recording sheet, the swelling of the recording sheet is a wavy valley portion previously given to the recording sheet, as described in the conventional example. That is, it occurs in the direction away from the recording head between the recess 108 and the rib 207 of the platen and the auxiliary rib 208, and prevents the contact with the recording head. However, there is also an adverse effect by that amount, and in the portion where the cock ring is generated, the recording surface of the recording sheet is moved away from the recording head, so that the landing deviation of the ink droplet becomes large. Further, even in the unrecorded area to be recorded from now on, the valley portion is moved away from the recording head due to the influence of the large waviness in the area where the cock ring is generated, and the landing deviation of the ink droplet is also large.
【0015】
A third issue is that the depth of the wavy valleys given to the recording sheet changes before and after the rear end of the recording sheet passes through the transport rollers (102, 202). This occurs when the non-recording surface of the recording sheet is supported by the transport roller over the entire width direction, and is supported only by the ribs 107 and 207 of the platen. That is, in the state before the rear end of the recording sheet passes through the transport roller, the transport roller portion supports the entire width of the recording sheet when trying to give a wavy shape that becomes a valley between the ribs 107 and 207 of the platen. Because it is, it is affecting as a drag. However, after the rear end of the recording sheet passes through the transport roller, this drag force disappears, so that the depth of the valley increases. As a result, the landing position of the ink droplets may be displaced, and the color of the image may be displaced or a feeling of roughness may occur.
【0016】
The present invention has been made in view of the above problems, and an object of the present invention is to prevent the recording head and the recording sheet from coming into contact with each other due to the influence of a cock ring or curl, from the front end to the rear end of the recording sheet. The present invention is to provide a recording device that keeps the distance between the recording head and the recording surface of the recording sheet (hereinafter referred to as the head-sheet distance) unchanged over the entire area. Another object of the present invention is to grow the cock ring generated when a high-density recorded image is recorded, not in the direction away from the recording head, but to grow toward the recording head side, and to obtain the cock ring. By reducing the difference in height between peaks and valleys (hereinafter referred to as PP (abbreviation of peak to peak)), we decided to prevent contact with the recording head and eliminate the deterioration of ink droplet landing deviation as much as possible. is there.
【0017】
[Means for solving problems]
In order to achieve the above object, the first recording device of the present invention is arranged at a position facing the transport means for transporting the recording sheet and the recording head for recording on the recording sheet, and is arranged in the transport direction of the recording sheet. In a recording device provided with a plurality of extending concave portions and a platen on which a convex portion is formed, a rotatable rotating body is arranged by pressure contacting a position downstream of the transport direction of the recording head and facing each of the concave portions. It is characterized by having.
【0018】
Further, it may have a rotatable rotating body which is arranged by pressure contacting a position downstream of the transport direction of the recording head and facing each convex portion.
【0019】
Further, it is preferable that the step between each convex portion and each concave portion at the position where the rotating body is arranged is at least 0.5 mm or less, and this value is the wavy shape given upstream in the transport direction in the recording area. It is better to decide by how many PPs are kept.
【0020】
According to the first invention described above, since the rotating body corresponding to the wavy holding spur in the above-mentioned conventional example is rotatably pressed and arranged in the concave portion of the platen, the height of the rotating body is surely determined. Moreover, since the depth of the wavy valley of the recording sheet is also determined by this recess, the head-sheet distance can be stably maintained in the entire area from the front end to the rear end of the recording sheet.
【0021】
Further, when a high-density recorded image is recorded, a wavy shape in which the convex portion of the platen is a peak and the concave portion is a valley is given in advance, so that the wavy amplitude grows in a direction of increasing. Since the height of the wavy valley is determined by the concave part of the platen and is pressed by the rotating body, the swelling of the recording sheet is absorbed so that the bottom surface of the valley expands, and it cannot be absorbed here. The swelling of the recording sheet spreads to the wavy peaks and grows as a cock ring so as to slightly swell toward the recording head. Here, when the tip of the recording sheet reaches the transport roller pair arranged downstream in the transport direction, the ridge portion of this cock ring is crushed, and the cock ring ridge is formed between the rotating body (wavy holding spur) and the transport roller pair. Divide. That is, since the PP is lowered by dividing one mountain into two, it is possible to prevent the ink droplets from coming into contact with the recording head and to eliminate the landing deviation of the ink droplets as much as possible.
【0022】
Further, the second recording device of the present invention is arranged at a position facing the conveying means for conveying the recording sheet and the recording head for recording on the recording sheet, extends in the conveying direction of the recording sheet, and has a height. A platen having at least two different height protrusions, including a plurality of first protrusions consisting of the tallest protrusions and a plurality of second protrusions consisting of protrusions lower in height than each of the first protrusions. A recording device comprising the above, characterized in that it has a rotatable rotating body that is arranged by pressure contacting at least one type of each of the second protrusions downstream in the transport direction of the recording head.
【0023】
Here, it may have a rotatable rotating body that is pressed and placed at a position facing each first protrusion downstream in the transport direction of the recording head.
【0024】
Further, it is preferable that the step between each of the first protrusions and the protrusion of which the rotating body is pressure-welded among the second protrusions is at least 0.5 mm or less, and this value is the wavy shape given upstream in the transport direction. However, it is better to decide by how many PPs are kept in the recording area.
【0025】
Further, a plurality of first protrusions composed of a plurality of recesses, a plurality of protrusions, and a protrusion having the highest height are provided on a platen arranged at a position facing the recording head so as to extend in the transport direction of the recording sheet. , And a plurality of second protrusions composed of protrusions having a height lower than that of each first protrusion, the portion to be pressure-contacted by the rotating body is formed of a roller member rotatably supported by the platen. The upper part of the outer periphery of the member may have substantially the same height as the upstream portion in the transport direction.
【0026】
According to the second invention described above, the rotating body corresponding to the wavy holding spur in the above-mentioned conventional example is rotatably pressed and arranged on at least one of the plurality of second protrusions of the platen, so that it is reliable. Since the height of the rotating body is determined and the depth of the wavy valley of the recording sheet is also determined by this second protrusion, the distance between the head and the sheet is determined in the entire area from the front end to the rear end of the recording sheet. It is possible to keep it stable.
【0027】
In addition, when a high-density recorded image is recorded, the highest convex portion of the plurality of protrusions on the platen is at least one type of peak and second protrusion, and is rotatably pressure-welded. Since the wavy shape that becomes a valley is given to the portion having the rotating body, the wavy amplitude grows in the direction of increasing. Although the height of the wavy valley is determined by the second protrusion of the platen, it grows as a cock ring in the direction in which the valley becomes deeper between these protrusions and cannot be absorbed here. The swelling of the recording sheet spreads to the wavy peak portion, that is, the highest protrusion portion, and grows as a cock ring so as to slightly bulge toward the recording head side. Next, when the tip of the recording sheet reaches the transport roller pair arranged downstream in the transport direction, the ridge portion of this cock ring is crushed, and the cock ring ridge is formed between the rotating body (waving holding spur) and the transport roller pair. Divide. That is, since the PP is lowered by dividing one mountain into two, it is possible to prevent the ink droplets from coming into contact with the recording head and to eliminate the deterioration of the landing deviation of the ink droplets as much as possible.
【0028】
Further, the third recording device of the present invention is arranged at a position facing the conveying means for conveying the recording sheet and the recording head for recording on the recording sheet, and has a plurality of recesses extending in the conveying direction of the recording sheet. In a recording device provided with a platen having a convex portion, a rotatable rotation that is arranged downstream of the transport direction of the recording head and at a position facing each of the concave portions, and is supported so as to be elastically movable at least in the height direction. A slit is formed in each of the recesses facing the rotating body while having a body so that the rotating body does not come into contact with each other, and in the absence of the recording sheet, the lower part of the outer circumference of the rotating body is the recess. It is characterized in that it is held so as to have substantially the same height as the above and at any position in the slit.
【0029】
Further, it has another rotatable rotating body which is arranged downstream in the transport direction of the recording head and faces a plurality of convex portions of the platen and is supported so as to be elastically movable at least in the height direction. Another slit is formed in each convex portion facing the rotating body so that another rotating body does not come into contact with each other, and in the absence of a recording sheet, the lower part of the outer circumference of the other rotating body is abbreviated as each convex portion. It may be held so as to be located at the same height and in another slit.
【0030】
Further, the step between each convex portion at the position where another rotating body is arranged and each concave portion where the slit is formed may be at least 0.5 mm or less, and the transfer located downstream of the transfer direction of the recording head may be performed. The means may have a transport roller pair that sandwiches and transports the recording sheet substantially downstream of each convex portion in the transport direction.
【0031】
Further, the fourth recording device of the present invention is arranged at a position facing the conveying means for conveying the recording sheet and the recording head for recording on the recording sheet, extends in the conveying direction of the recording sheet, and has a height. It has at least two or more different height protrusions, including a plurality of first protrusions consisting of the tallest protrusions and a plurality of second protrusions consisting of protrusions having a height lower than each of the first protrusions. In a recording device provided with a platen, the rotatable device is arranged at a position facing at least one type of each of the second protrusions downstream in the transport direction of the recording head, and is supported so as to be elastically movable at least in the height direction. A slit is formed in the protrusions of the protrusion group with the rotating body facing the rotating body so that the rotating body does not come into contact with the rotating body. However, the rotating body is held so as to be located at substantially the same height as the protrusions of the protrusions facing each other and in any of the slits.
【0032】
Further, it has another rotatable rotating body which is arranged at a position facing the first protrusion and is supported so as to be elastically movable at least in the height direction downstream in the transport direction of the recording head, and the other rotating body. Another slit is formed in the protrusions of the group of protrusions facing each other so that the other rotating bodies do not come into contact with each other. It may be held so as to be located at substantially the same height as the protrusions of the group of protrusions to be formed and at any of the protrusions in another slit.
【0033】
Further, it is preferable that the step between each of the first protrusions on which another rotating body is arranged and each of the second protrusions provided with slits is at least 0.5 mm or less.
【0034】
Further, a roller member having groove-shaped slit portions facing each of the rotating body and another rotating body is rotatably supported by the platen, and both side portions of the groove shape of the roller member convey the platen. It may be located at substantially the same height as the surface upstream in the direction.
【0035】
Further, the transport means located downstream in the transport direction of the recording head may have a transport roller pair for sandwiching and transporting the recording sheet substantially downstream in the transport direction of the first protrusion.
【0036】
Further, the platen has a plurality of concave portions and convex portions extending in the transport direction of the recording sheet, and has a wavy shape in which the convex portions form peaks and the concave portions form valleys upstream of the recording head in the transport direction. It may have a wavy shape imparting means for imparting.
【0037】
Further, the wavy shape imparting means has a transport roller pair located upstream in the transport direction of the recording head, a convex portion and a concave portion, and the nip position of the transport roller pair is located above the convex portion and the transport roller. Of the pair, the roller that contacts the non-recording surface of the recording sheet is offset from the roller that contacts the other recording surface to the recording head side, so that the recording sheet is pressed against the platen. Alternatively, the wavy shape imparting means may be a sheet guide member for guiding the recording sheet to the convex portion and the concave portion, and may have a protrusion for guiding the recording sheet to the concave portion. Often, in this case, the protrusions of the seat guide member may be elastically deformable.
【0038】
According to the above-mentioned third and fourth inventions, the same effect as that of the first and second inventions can be obtained, and the rotating body does not come into contact with the platen in the absence of the recording sheet. For example, even when a spur having a plurality of protrusions on the outer peripheral surface is used as the rotating body, the spur is not damaged. Further, the slit formed here is wide enough to avoid contact with the rotating body, and is not wide enough to push the recording sheet between the slits.
【0039】
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment) The recording apparatus according to the first embodiment of the present invention will be described with reference to the drawings.
【0040】
FIG. 1 is a perspective view in which a part around the platen of the recording device of the present invention is cut out, and FIG. 2 is a sectional view taken along line AA in FIG.
【0041】
In FIG. 1, the recording head 1 is mounted on the carriage 2, and the carriage 2 is driven by a carriage motor (not shown) via a timing belt 3, and is driven by a guide rail 4 and a support rail 6 provided on the chassis 5. It is supported and is designed to scan back and forth on the platen 7.
【0042】
On the other hand, the recording sheet S is conveyed to the nip position of the transfer roller pair 8 including the transfer roller 8a and the pinch roller 8b by a feeding mechanism (not shown), and skewing and the like are corrected. Here, the pinch roller 8b receives the urging force of the pinch roller spring 8d via the pinch roller holder 8c and is urged to the transport roller 8a. As a result, the pinch roller 8b is driven by the rotation of the transport roller 8a, and the recording sheet S can be sandwiched and transported. At this time, as shown in FIG. 2, the pinch roller 8b is urged at a position offset to the downstream side in the transport direction with respect to the transport roller 8a, and the nip position of the transport roller vs. 8 is located above the platen 7. , The recording sheet S is conveyed so as to be pressed against the platen 7 from diagonally above.
【0043】
On the transport surface of the platen 7, a plurality of convex portions 9 and concave portions 10 extending in the sheet transport direction are alternately arranged at intervals of 20 to 40 mm. Therefore, when the recording sheet S is pressed against the platen 7 by the transport roller pair 8, it is given a wavy shape in which the convex portion 9 forms a peak and the concave portion 10 forms a valley. Here, the step between the convex portion 9 and the concave portion 10 is preferably 0.5 mm or less, and this value is the position of the wavy valley portion described above in the recording area of each recording device, specifically, the recording range of the recording head 1. It is better to set it below the height.
【0044】
Further, a wavy holding spur 11 is arranged in the recess 10 downstream of the recording area, and the center of rotation thereof is rotatably supported by the torsion coil spring 12 and is pressed against the recess 10. As a result, when the tip of the recording sheet S reaches the wavy holding spur 11, the wavy holding spur 11 rotates and moves upward by the thickness of the recording sheet S, and the recording sheet S is moved upward by the thickness of the wavy holding spur and the recess 10. It can be introduced in between. Here, the "spur" is a disk-shaped one having a plurality of sharp protrusions on the outer circumference, and the sharp protrusions abut on the recording surface of the recording sheet with a small area, and the recording sheet S is downstream of the recording area. When there is unfixed ink on the top, it assists in transporting the recording sheet without disturbing the recorded image. Here, when the recording device uses ink having good fixability, it is not limited to spurs, and may be, for example, a simple molded disk shape.
【0045】
Further, a paper ejection roller pair 13 including a paper ejection roller 13a and a transport spur 13b is provided substantially downstream of the convex portion 9. Here, in the paper ejection roller 13a, a paper ejection roller 13a formed of an elastic body such as rubber is formed on the paper ejection roller shaft 13c by press fitting or the like. The center of rotation of the transport spur 13b is rotatably supported by the torsion coil spring 12, and is urged by the paper ejection roller 13a. As a result, the transport spur 13b is driven by the rotation of the paper ejection roller 13a, and the recording sheet S can be sandwiched and transported.
【0046】
In such a configuration, the recording sheet S for which recording has been completed is transported to and stored in a paper output tray (not shown).
【0047】
Next, the behavior of the recording sheet S before recording and when a high-density recorded image is recorded will be described with reference to FIGS. 3 (a) to 3 (d). Note that these figures show the B arrow view in FIG. 1, FIG. 3 (a) shows the state before the tip of the recording sheet S reaches the wavy holding spur 11, and FIG. 3 (b) shows the recording sheet. The tip of S has passed the wavy holding spur 11, FIG. 3 (c) shows the tip of the recording sheet S passing through the paper ejection roller pair 13, and FIG. 3 (d) shows the rear end of the recording sheet S being the transport roller. It represents the state of passing through 8 vs. 8. Further, the solid line S1 representing the recording sheet S in each figure is a recording sheet in an unrecorded state before recording by the recording head 1, or a low-density recorded image is recorded, and the recording sheet is almost swelled. The broken line S2 represents a state in which a high-concentration recorded image is recorded, and the recording sheet S swells and cockling occurs.
【0048】
First, in (a) to (d) of FIG. 3, a recording sheet in an unrecorded state before recording or a low-concentration recorded image shown by the solid line S1 is recorded, and swelling hardly occurs. The recording sheet will be described.
【0049】
First, the behavior before the tip of the recording sheet reaches the wavy holding spur 11 will be described. The recording sheet S1 is conveyed so as to be pressed against the platen 7 by the transfer roller pair 8, so that the recording sheet S1 is provided with a wavy shape in which the convex portion 9 forms a peak and the concave portion 10 forms a valley. Here, since the step between the convex portion 9 and the concave portion 10 is set to be equal to or lower than the height of the wavy valley portion described above in the recording range, the non-recording surface of the recording sheet S1 located at the valley portion contacts the concave portion 10. doing. Further, since the mountain portion is pressed against the convex portion 9 by the transport roller pair 8, the non-recording surface is also in contact with the convex portion 9. (State of FIG. 3A) Next, a state in which the tip of the recording sheet has passed the wavy holding spur 11 will be described. Originally, the wavy holding spur 11 was arranged in a state of being pressed against the recess 10, so that the wavy holding spur 11 only rises by the thickness of the recording sheet S1 as it is conveyed, and the posture and head of the recording sheet S1. -There is no change in the distance between seats. (State of FIG. 3B) Next, a state in which the tip of the recording sheet has passed through the paper ejection roller pair 13 will be described. (The paper ejection roller 13a is not shown in FIG. 3.) Again, the paper ejection roller pair 13 is provided substantially downstream of the convex portion 9, and the height of the nip thereof is also substantially the same as the convex portion 9. Since the transport spur 13b is placed in, the transport spur 13b only rises by the thickness of the recording sheet S1 as it is transported, and the posture of the recording sheet S1 and the head-seat distance do not change (Fig. 3 (c)). Status).
【0050】
Finally, a state in which the rear end of the recording sheet has passed through the transfer rollers vs. 8 will be described. Here, the pressing force of the transport roller pair 13 against the platen 7 is lost, but the peak portion of the recording sheet S1 is held by the paper ejection roller pair 13, and the valley portion is pressed against the recess 10 by the wavy holding spur 11. Therefore, there is no change in the attitude of the recording sheet S1 and the distance between the head and the sheet. Further, in the present embodiment, since the wavy holding spur 11 is arranged upstream in the recording sheet transport direction with respect to the paper ejection roller pair 13, the weight of the tip portion of the recording sheet that has already passed through the paper ejection roller pair 13 causes. Even if the recording sheet bows with the paper ejection roller pair 13 as the base point, that is, the tip of the recording sheet hangs downward, the rear end of the recording sheet does not rise toward the recording head 1. (State of FIG. 3D) As described above, in the present invention, a recording sheet in an unrecorded state before recording by the recording head 1 or a low-density recorded image is recorded, and the recording sheet is almost swelled. In the state where it does not occur, the wavy shape and the head-sheet distance do not change from the front end to the rear end of the recording sheet, so that it is possible to prevent the ink droplets from landing and shifting.
【0051】
Further, although the recording sheet is curled due to the atmospheric environment, the wavy shape is given upstream of the recording area, and the wavy shape is maintained by the wavy holding spur 11 even after the rear end passes through the transport roller pair 13. Therefore, the stiffness of the recording sheet S becomes stronger and the curl is corrected, so that the recording sheet S is prevented from floating on the recording head 1 side.
【0052】
Next, a state in which a high-density recorded image is recorded on the recording sheet and cockling occurs, which is indicated by the broken line S2 in FIGS. 3A to 3D, will be described.
【0053】
First, the behavior before the tip of the recording sheet reaches the wavy holding spur 11 will be described. When a high-density recorded image is recorded, the convex portion of the platen 7 is preliminarily provided with a wavy shape in which the convex portion is a peak and the concave portion is a valley. Try to absorb as it grows. However, since the height of the valley portion is determined by the recess 10 of the platen 7, the swelling of the recording sheet S2 is absorbed so that the bottom surface of the valley portion expands, and the swelling of the recording sheet S2 that could not be absorbed here is absorbed. , It spreads to the wavy mountain part and grows as a cock ring so as to slightly swell toward the recording head 1 side (state in Fig. 3 (a)).
【0054】
Here, since the valley portion was not supported in the conventional example, the swelling of the recording sheet S2 was absorbed by the valley portion being lowered. Therefore, the mountain part hardly swelled to the recording head 1 side, but the PP became larger by that amount, and as a result, the head-seat distance in the area to be recorded from now on was also widened. On the other hand, in the present embodiment, the bottom surface of the valley portion is widened, but the distance between the head and the sheet is not widened, and the mountain portion is slightly raised toward the recording head 1, but the swelling of the recording sheet S2 is in the valley portion. A significant amount has been absorbed so that it does not come into contact with the recording head 1.
【0055】
Next, a state in which the tip of the recording sheet has passed the wavy holding spur 11 will be described. Originally, the wavy holding spur 11 was arranged in a state of being pressed against the recess 10, so here, the wavy holding spur 11 only rises by the thickness of the recording sheet S2 as it is conveyed, and the state of the recording sheet S2. Is the same as the state shown in Fig. 3 (a) (state in Fig. 3 (b)).
【0056】
Next, a state in which the tip of the recording sheet reaches the paper ejection roller pair 13 will be described. Here, since the nip height of the paper ejection roller pair 13 is arranged at substantially the same height as the convex portion 9, the cock ring pile is floated from the convex portion 9 as shown in FIG. 3 (b). When it arrives, this mountain is crushed and divided into the left and right sides of the transport spur 13b, that is, between the wavy holding spur 11 and the transport spur 13b. Therefore, when one mountain is divided into two, the PP is even lower than in the conventional example (state in Fig. 3 (c)).
【0057】
Finally, a state in which the rear end of the recording sheet has passed through the transfer rollers vs. 8 will be described. Here, as described above, there is no lift of the rear end due to the bowing of the front end of the recording sheet, and the state of the recording sheet S2 is the same as the state shown in FIG. 3 (c) (state in FIG. 3 (d)). ..
【0058】
As described above, in the present invention, a high-density recorded image is recorded, and even when a cock ring occurs, the valley of the cock ring does not fall below a predetermined height, and the bottom surface of the valley portion expands. As a result, the swelling is absorbed, and the swelling that could not be absorbed here spreads to the wavy peaks and grows as a cock ring so that it slightly swells toward the recording head 1, but the swelling of the recording sheet is in the valleys. Since a considerable amount is absorbed, it is possible to keep the PP low rather than contacting the recording head 1. Further, after the tip of the recording sheet passes through the paper ejection roller pair 13, the number of cock ring ridges is doubled, so that the PP is further suppressed. Therefore, it is possible to minimize the ink landing deviation and prevent contact with the recording head.
【0059】
As a supplement here, the larger the number of wavy peaks in the swelling of the recording sheet, the lower the PP, which is the amplitude, can be suppressed. Therefore, it has been pointed out that the number of ridges should be increased from the beginning in the form of giving the wavy shape to the recording sheet in advance, but in order to give the wavy shape to the originally flat recording sheet, , The pitch of the mountain needs to be about 20-40mm. If you ignore this and try to increase the number of mountains, the place that should be a valley becomes a mountain, or the adjacent mountains become one mountain, and a phenomenon that floats on the recording head side occurs. The reason why the number of ridges of the cock ring can be doubled in the present invention is that one ridge is divided into two ridges by the transport spur 13b for the recording sheet in which the cock ring is generated and the rigidity is weakened to some extent. is there.
【0060】
Since the recording device in each of the following embodiments is basically the same as the recording device in the first embodiment, only the differences from the first embodiment will be described, and the same members will be indicated by the same reference numerals. To do. (Second Embodiment) In the first embodiment, the spurs arranged on the platen 7 are only the wavy holding spurs 11 pressed against the recess 10, but in the present embodiment, as shown in FIG. In addition to the wavy holding spur 11, the convex spur 14 is also arranged on the convex portion 9. The convex spur 14 is arranged at substantially the same position as the wavy holding spur 11 in the transport direction, and its rotation center is rotatably supported by the torsion coil spring 15 and is pressed against the convex portion 9. .. By adopting such a configuration, in a recording sheet in an unrecorded state or a recording sheet in which swelling due to recording hardly occurs, the recording sheet can be more reliably brought into close contact with the convex portion 9, and the cock ring can be obtained. It is possible to double the number of ridges before reaching the output roller pair 13 in the recording sheet in which the problem occurs. (Third Embodiment) In this embodiment, as shown in FIG. 5, a notch 7a is formed in the platen 7, and a paper ejection roller pair 13 is arranged at the position of the notch 7a. As a result, the paper ejection roller pair 13 is arranged at substantially the same position as the wavy holding spur 11 in the transport direction.
【0061】
However, in this case, in order to prevent the rear end of the recording sheet from floating after the rear end of the recording sheet has passed through the transport roller pair 8, the transport spur 13b is offset to the upstream side in the transport direction with respect to the paper ejection roller 13a to record the recording paper. It is necessary to have a configuration in which the rear end is pressed in the platen 7 direction. With such a configuration of the present embodiment, the depth direction of the device can be shortened and space saving can be realized. (Fourth Embodiment) In the first embodiment, the height of the recess 10 is configured to be the same from the upstream to the downstream in the transport direction, but in the present embodiment, the height on the upstream side is as shown in FIG. The recess is made low. That is, a first recess 16 and a second recess 17 are provided on the platen 7. The step between the second concave portion 17 and the convex portion 9 is configured in the same manner as before, and the first concave portion 16 is configured lower than the second concave portion 17. Further, in the position of the second recess 17 in the transport direction, it is located approximately directly below the recording position of the recording head 1. With such a configuration of the present embodiment, the amplitude of the wavy shape is configured to be larger in the range of the first recess 16 than in the range of the second recess 17, so that the second recess 17 is surely made. It is possible to spread the wavy shape to the range of, and it is particularly effective when the transport roller pair 8 is far from the recording position of the recording head 1 or when the length of the recording head 1 is long. (Fifth Embodiment) In each of the above-described embodiments, there is one type of convex portion and one type of concave portion formed on the platen 7, but the recording device of the present embodiment has the platen 7 as shown in FIG. Three types of convex parts with different heights are provided on the top.
【0062】
In FIG. 7, a first convex portion 18 having a different height, a second convex portion 19, and a third convex portion 20 are arranged on the platen 7. Of these protrusions, the first convex portion 18 is the highest, followed by the second convex portion 19, and the lowest is the third convex portion 20. Here, the step between the first convex portion 18 and the second convex portion 19 is preferably 0.5 mm or less, and this value is set in the recording area of each recording device, specifically, in the recording range of the recording head 1. It is better to set it below the height where the above-mentioned wavy valley is located. The third convex portion 20 is arranged between the first convex portion 18 and the second convex portion 20. Further, the wavy holding spur 11 is configured to be pressed against the second convex portion 19.
【0063】
Next, the behavior of the recording sheet S before recording and when a high-density recorded image is recorded will be described with reference to FIGS. 8 (a) to 8 (d). Note that these figures show the C arrow view in FIG. 7, FIG. 8 (a) shows the state before the tip of the recording sheet S reaches the wavy holding spur 11, and FIG. 8 (b) shows the recording sheet. The tip of S has passed the wavy holding spur 11, FIG. 8 (c) shows the tip of the recording sheet S passing through the paper ejection roller pair 13, and FIG. 8 (d) shows the rear end of the recording sheet S being the transport roller. It represents the state of passing through 8 vs. 8. In addition, the solid line S3 representing the recording sheet S in each figure represents a recording sheet in an unrecorded state before recording is performed, or a state in which a low-density recorded image is recorded and almost no swelling occurs, and a broken line S4 Indicates a state in which a high-density recorded image is recorded, the recording sheet is swollen, and cockling occurs.
【0064】
First, in FIGS. 8 (a) to 8 (d), the unrecorded recording sheet before recording or the low-density recorded image shown by the solid line S3 is recorded, and swelling hardly occurs. I will explain the recording sheet. Regarding this, the contact point of the wavy valley portion is changed from the concave portion 10 to the second convex portion 19 with respect to the one according to FIG. 3 used in the first embodiment, and the behavior of the recording sheet itself is changed. Since there is no change, detailed explanation will be omitted.
【0065】
Next, a state in which a high-density recorded image shown by a broken line S4 in FIGS. 8 (a) to 8 (d) is recorded and cockling occurs will be described.
【0066】
First, the behavior before the tip of the recording sheet reaches the wavy holding spur 11 will be described. When a high-density recorded image is recorded, the recording sheet is basically swollen because the first convex portion 18 is preliminarily provided with a wavy shape and the second convex portion 19 is provided with a valley. Attempts to absorb by increasing the amplitude of the undulations. However, since the height of the valley portion is determined by the second convex portion 19, the valley portion is divided into two and occurs between the second convex portion 19 and the third convex portion 20 to cause swelling. Absorb. In addition, the swelling of the recording sheet that could not be absorbed here spreads to the wavy peaks, but the amount absorbed in the valleys is larger than that in the first embodiment, and the recording is performed. The amount of swelling toward the head 1 side decreases (state in Fig. 8 (a)).
【0067】
Next, the behavior of the wavy holding spur 11 in the state where the tip of the recording sheet 1 has passed through the wavy holding spur 11 is the same as that of the first embodiment, and the state of the recording sheet S4 is the same as the state shown in FIG. 8a. (State in Figure 8 (b)).
【0068】
Next, a state in which the tip of the recording sheet reaches the paper ejection roller pair 13 will be described. Here, since the nip height of the paper ejection roller pair 13 is arranged at substantially the same height as the first convex portion 18, it floats from the first convex portion 18 as shown in FIG. 8 (b). When the cock ring peak arrives in this state, this peak is crushed and divided into the left and right sides of the transport spur 13b, that is, between the wavy holding spur 11 and the transport spur 13b. Therefore, when one mountain is divided into two, the PP is even lower than in the conventional example (state in Fig. 8 (c)).
【0069】
Finally, a state in which the rear end of the recording sheet has passed through the transfer rollers vs. 8 will be described. Here, as described above, there is no lift of the rear end due to the bowing of the front end of the recording sheet, and the state of the recording sheet S2 is the same as the state shown in FIG. 3 (c) (state in FIG. 8 (d)). ..
【0070】
As described above, in the present embodiment, it is possible to further reduce the amount of swelling toward the recording head 1 in the state before reaching the wavy holding spur 11 when the cock ring occurs. However, at that time, the distance between the head and the sheet in the valley part increases slightly, so a film-based recording sheet in which cockling is unlikely to occur is suitable for the main device. In this case, the distance between the head 1 and the first convex portion 18 is shortened as much as possible so that a high image can be obtained. Although it spreads, it is possible to prevent contact with the recording head 1.
【0071】
Here, in the present embodiment, the spurs arranged on the platen 7 are only the wavy holding spurs 11 that abut on the second convex portion 19, but as shown in the second embodiment, the first convex portion is used. The convex spur 14 that abuts on 18 may be arranged, or the paper ejection roller pair 13 may be arranged at substantially the same position as the wavy holding spur 11 in the transport direction as shown in the third embodiment. Further, as shown in the fourth embodiment, the upstream side of the second and third convex portions 19 and 20 may be lowered by one step. Further, the type of the convex portion is limited to three in the present embodiment, but the present invention is not limited to this, and it is preferable that at least two or more types are provided. (Sixth Embodiment) In each of the above-described embodiments, the wavy holding spur 11 and the convex spur 14 are directly pressed against the concave and convex portions on the platen 7, but the recording device of the present embodiment is shown in FIG. As shown in, a rotatable roller is provided on the platen 7.
【0072】
In FIG. 9, the convex roller 21 is rotatably provided on the platen 7 so that the upper surface of the outer periphery thereof is substantially the same height as the convex 9 downstream of the recording region of the convex 9. Further, the recess roller 22 is rotatably provided on the platen 7 so that the upper surface of the outer periphery thereof is substantially the same height as the recess 10 downstream of the recording area of the recess 10. The convex spur 14 is pressed against the convex roller 21, and the wavy holding spur 11 is pressed against the concave roller 22.
【0073】
In the above configuration, the recording sheet S is sandwiched between the wavy holding spur 11 and the rotatable concave roller 22 and between the convex spur 14 and the rotatable convex roller 21. It is possible to reduce the transport resistance of S. Further, since the convex portion roller 21 and the concave portion roller 22 are directly incorporated into the platen 7, it is easy to make the outer peripheral upper surface thereof substantially the same height as the height of the convex portion 9 and the concave portion 10, respectively. Therefore, the other effects are similar to those obtained in the second embodiment. (7th Embodiment) In each of the above-described embodiments, the wavy holding spur 11 and the convex spur 14 are directly pressed against the convex portion 9 and the concave portion 10 on the platen 7, but the record of this embodiment is recorded. As shown in FIG. 10, the device keeps the lower surface of the outer circumference of the spurs equal to or less than the convex portion 9 and the concave portion 10 in the absence of the recording sheet S, and on the platen 7 so that these spurs do not come into contact with the platen. It has a structure with slits.
【0074】
In FIG. 10, the wavy holding spur 23 is supported by a torsion coil spring 25 so that its rotation center is rotatable and elastically movable in the height direction. Further, the height of the lower surface of the outer circumference is held by a spur holder (not shown) so as to be located at the same height or less with respect to the recess 10. Similarly, the convex spur 24 is supported by a torsion coil spring 26 so that its center of rotation is rotatable and elastically movable in the height direction. Further, the height of the lower surface of the outer circumference is held by a spur holder (not shown) so as to be located at the same height or less with respect to the convex portion 9. Further, the recess 10 where the wavy holding spur 23 is located is provided with a slit 27 to the extent that the wavy holding spur 23 does not come into contact with the recess 10. Similarly, a slit 28 is also provided in the convex portion 9 where the convex spur 24 is located. Therefore, when the recording sheet S reaches these wavy holding spurs 23 and 24, these wavy holding spurs 23 and 24 rotate with the transportation of the recording sheet S from the concave portion 10 and the convex portion 9 by the thickness of the recording sheet S. Move upwards. Here, since the slits 27 and 28 have a slit width such that the wavy holding spurs 23 and the convex spurs 24 do not come into contact with each other, the recording sheet S is not pushed between the slits 27 and 28 by these spurs. .. Therefore, the posture of the recording sheet S is the same as that described in each of the above-described embodiments, in which the concave portion 10 has a wavy valley and the convex portion 9 has a mountain.
【0075】
In the above configuration, before the recording sheet S reaches the wavy holding spurs 23 and the convex spurs 24, the wavy holding spurs 23 and 24 do not come into contact with the platen 7, so that the outer peripheral surface of the spurs Damage to the provided protrusions is prevented. On the contrary, it is possible to prevent the platen 7 from being scratched by these protrusions, and to avoid jams and damage caused by the recording sheet S being caught in the scratches. The other effects are the same as those obtained in the second embodiment. (8th Embodiment) In the 7th embodiment, the slit is directly provided on the platen, but in the recording device of the present embodiment, as shown in FIG. 11, the slit portion is as described in the 6th embodiment. It is composed of rollers.
【0076】
The convex slit roller 29 is formed with a small diameter portion 29b in which the diameter of the portion corresponding to the convex spur 24 is smaller than the diameter of both side portions 29a. The upper surface of the convex portion 9 is rotatably provided on the platen 7 so as to be substantially the same height as the upstream side of the recording sheet S in the transport direction. Similarly, the recessed slit roller 30 is formed with a small diameter portion 30b in which the diameter of the portion corresponding to the wavy holding spur 23 is smaller than the diameter of both side portions 30a. It is rotatably provided on the platen 7 so that the upper surface of the outer circumference is substantially the same height as the recess 10 on the upstream side in the transport direction of the recording sheet S. That is, the convex slit roller 29 and the concave slit roller 30 of the present embodiment have the small diameter portions 29b and 30b between the side portions 29a and 30a functioning in the same manner as the slit described in the sixth embodiment. Is.
【0077】
As described above, in the configuration of the present embodiment, the effects of the sixth embodiment and the effects of the seventh embodiment can be obtained together.
【0078】
Although the embodiments have been described above with specific examples, it goes without saying that the recording device may be configured by combining the embodiments described above. Further, as the waviness imparting means upstream of the recording area, the same configuration as that of the second conventional example has been described, but the same configuration as that of the first conventional example may be used, and the waviness imparting means on the upstream side is limited. It's not something to do.
【0079】
[Effect of the invention]
As described above, according to the first invention, since the rotating body is rotatably pressed and placed in the recess of the platen, the height of the rotating body is surely determined, and the wavy valley of the recording sheet is formed. Since the depth is also determined by this recess, it is possible to maintain a stable head-sheet distance over the entire area from the front end to the rear end of the recording sheet.
【0080】
Also, even when a high-density recorded image is recorded, the height of the wavy valley is determined by the recess of the platen and is pressed by the rotating body, so that the bottom surface of the valley expands. By absorbing the swelling of the recording sheet and dividing the cock ring ridge due to the swelling of the recording sheet that could not be absorbed here into two by a transport roller pair, the PP becomes low, preventing contact with the recording head. At the same time, it is possible to eliminate the landing deviation of the ink droplets as much as possible.
【0081】
Further, according to the second invention, since the rotating body is rotatably pressed and arranged on at least one kind of a plurality of second protrusions of the platen, the height of the rotating body is surely determined and recorded. Since the depth of the wavy valley of the sheet is also determined by this second protrusion, it is possible to maintain a stable head-seat distance over the entire area from the front end to the rear end of the recording sheet.
【0082】
Further, according to the third and fourth inventions, the same effects as those of the first and second inventions can be obtained, and in the absence of the recording sheet, the rotating body does not come into contact with the platen. Even when a spur having a plurality of protrusions on the outer peripheral surface is used as the body, the spur is not damaged.
[Simple explanation of drawings]
FIG. 1 is a perspective view of a recording device according to the first embodiment of the present invention.
FIG. 2 is an AA cross-sectional view of the recording device shown in FIG.
FIG. 3 is a diagram illustrating the behavior of a recording sheet with a view taken along the arrow B of the recording device shown in FIG.
FIG. 4 is a perspective view of a recording device according to a second embodiment of the present invention.
FIG. 5 is a perspective view of a recording device according to a third embodiment of the present invention.
FIG. 6 is a cross-sectional view of a recording device according to a fourth embodiment of the present invention.
FIG. 7 is a perspective view of a recording device according to a fifth embodiment of the present invention.
FIG. 8 is a diagram illustrating the behavior of the C arrow view recording sheet of the recording device shown in FIG. 7.
FIG. 9 is a perspective view of a recording device according to a sixth embodiment of the present invention.
FIG. 10 is a perspective view of a recording device according to a seventh embodiment of the present invention.
FIG. 11 is a perspective view of a recording device according to an eighth embodiment of the present invention.
FIG. 12 is a perspective view of a recording device according to the first conventional example.
13 is a diagram for explaining the behavior of the recording sheet with a view taken along the arrow D of the recording device shown in FIG. 12. FIG.
FIG. 14 is a perspective view of a recording device according to a second conventional example.
FIG. 15 is a sectional view taken along line EE of the recording device shown in FIG.
FIG. 16 is a diagram for explaining the behavior of the recording sheet with a view taken along the line F of the recording device shown in FIG.
[Explanation of symbols]
1 Recording Head 2 Carriage 3 Timing Belt 4 Guide Rail 5 Chassis 6 Support Rail 7 Platen 8 Transport Roller vs. 8a Transport Roller 8b Pinch Roller 8c Pinch Roller Holder 8d Pinch Roller Spring 9 Convex 10 Concave 11 Rippling Holding Spur 12, 15 Torsion Coil Spring 13 Paper ejection roller pair 13a, 13b Paper ejection roller 13c Paper ejection roller shaft 14 Convex spur 15 Torsion coil spring 16 First concave 17 Second concave 18 First convex 19 Second convex 20 Third convex 21 Convex roller 22 Concave roller 23 Holding spur 24 Convex spur 27, 28 Slit 29 Convex slit roller 29a, 30a Both sides 30 Concave slit roller
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6 members in 2 offices
Priority claims2
| Document | Office | Kind | Date |
|---|---|---|---|
| 2002269861 | Japan | A | |
| JP20020269861 | – | – | – |
Members6
| Document | Office | Kind | |
|---|---|---|---|
| JP2004106978AThis record | Japan | A | |
| US2004126164A1 | United States of America | A1 | |
| US6896432B2 | United States of America | B2 | |
| US2005168557A1 | United States of America | A1 | |
| US7232269B2 | United States of America | B2 | |
| JP4073008B2 | Japan | B2 |
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Numbers
- Publication
- 2004106978
- Publication, DOCDB
- 2004106978
- Publication, EPODOC
- JP2004106978
- Application
- 269861
- Application, DOCDB
- 2002269861
- Application, EPODOC
- JP20020269861
Titles3
- Japanese
- 記録装置
- English
- Recording device
- English
- RECORDER
Classification
- CPC, 3
- B41J11/005
- B41J11/06
- B41J13/14
- IPC, 8
- B41J2 01
- B41J11 00
- B41J11 02
- B41J11 06
- B41J13 02
- B41J13 14
- B65H29 22
- B65H29 70