Sewing machine equipped for producing shaped seams

[Detailed Description of the Invention]

Technical field The present invention has the sending device and model blind stitch forming device which can be adjusted with an adjustment, and is the model blind stitch forming device, The sensor which scans the next edge which is arranged ahead [ needle ] and is carrying out intermediary extension also of the angle to the first edge of sewing materials for calculation of the number of blind stitches, It has a switching circuit controlled by the pulse dispatch machine and program which have been connected with the arm shaft of a sewing machine, and this switching circuit is related with the Like sewing machine which the terminal point which can be beforehand set by the pulse to which a sewing machine is sent from a sensor and a pulse dispatch machine is made to suspend. Conventional technology The sewing machine of the above-mentioned kind is publicly known intermediary To have, for example by the British patent public presentation No. 44648 gazette. This sewing machine has one positioning motor and a blind stitch forming device of a corner. Under the present circumstances, the blind stitch of a corner belongs to the high-class classification of a model blind stitch (Formnahte). This blind stitch forming device has a sensor arranged ahead of a needle, and the sensor is used for calculating the number of puncture in order to scan the next edge which made the angle and has extended to the first edge of the material with Sewing of sewing materials. The device has a microprocessor circuit, and this circuit controls the positioning motor for stopping a sewing machine, where a needle is thrust into the point of the corner where sewing materials were defined beforehand. Somewhat is equal, or when sewing similar sewing materials, when a sewing machine's sewing the first sewing materials, in order that a blind stitch program may be made, it is operated by Duty, and the number of the puncture to the response of a sensor, the number of the puncture after the response of a sensor, and the speed to sew are memorized in that case. When sewing other sewing materials, a sewing machine is automatically operated by the microprocessor circuit using the data with Sewing memorized in the program phase. the number of blind stitches of the end field of sewing materials -- the influence which causes the obstacle by the state of the stretch from which sewing materials differ variously, the slide between the sending device of a sewing machine, and sewing materials, etc. by the edge scan of which calculation is canceled -- the accuracy of the length of a blind stitch -- within the limits of ±1 blind-stitch length -- I'm stuck -- as long as -- it is compensated. In what kind of angle position of the arm shaft of a sewing machine, it sets at what kind of time of blind stitch formation, The pulse dispatch machine connected with the arm shaft of the sewing machine is used, and it is a microprocessor circuit so that it can be decided whether a run of the edge of the sewing materials in which the sensor was scanned is answered, The number of the blind stitches after the response of a sensor is decided from the difference of the angle position of the arm shaft memorized between program phases, and the angle position measured in the sewing materials carried out after that. Thus, the accuracy of length is raised to the length of ±0.5 blind stitch in a blind stitch. However, in the case of the same material [ reach / or / in the case of a different material, / it / since surface character is different from each other, or since the thickness of material is different from each other ], because of the circumstances of the cloth it is running in the different direction, since variously different invoice voice occurs, various the above-mentioned Like accuracy cannot reach. When the slide which changes whenever sewing materials change occurred between the sending device and the sewing materials of each time of a sewing machine and the first sewing materials were sewn in it with manual operation as a result, it was recorded on it, and it sews in it, and a price program stops namely, already suiting it precisely to the following sewing materials in such a case. However, when the most convenient, even though the accuracy of ±0.5 blind-stitch length is acquired, the blind stitch which is completed and is visible becomes a problem, therefore from the edge of both sewing materials, only an equal distance separates and it is located again. For the blind stitch of the corner of the Like clothes which pose a problem, the range of the common difference of the length of one blind stitch has too large the puncture of the last of the blind stitch formed correctly. Object In order that the present invention may have a device for forming a It matched model blind stitch in the blind stitch or edge of the corner of the device for forming a model blind stitch, for example, a line, and two rows exactly and a sewing-machine needle may form the last puncture of a blind stitch, It aims at providing the sewing machine by which puncture is correctly carried out to the last point defined beforehand regardless of the state of sending at [ the ] every sewing materials. Elements of the Invention In order that the present invention may achieve the above-mentioned object, in order to actually decide the difference between the amounts of sending with the amount of target sending of sewing materials, The amount of sending in which the amount of target sending was adjusted by the switching circuit with the input device, The mutual interval of the 1st sensor and the 2nd sensor which is arranged forward and backward and forms the scanning device for a sewing-materials edge in the sending direction, It can be set as the 1st pulse sum computed according to the number of pulses which occurs from a pulse dispatch machine by one rotation of an arm shaft, the calculation actually performed in the switching circuit of a pulse where the amount of sending is sent from a pulse dispatch machine between the responses of the 1st sensor and the 2nd sensor -- it can be set by the 2nd pulse sum formed of distance, A regulation means is attached to an adjustment and the regulation means is a switching circuit, It is actually dependent on the difference between the amounts of sending, and the angle position of the arm shaft at the time of a response of the 1st sensor with the amount of target sending, only a quantity equal to the quotient shown for the integer by the division by the number of the remaining blind stitches of the distance between the end in the case of the response of the 1st sensor of the blind stitch which sewing materials should form completely for every sending movement of material sending, and the puncture position needed for the last blind stitch is sent -- as -- control -- possible intermediary To have -- it is characterized by things. EFFECT OF THE INVENTION Under the present circumstances, it is although the length of the superfluous last blind stitch that he therefore follows to a case before Is, with across the defined terminal point at them will be caused when regulation of a blind stitch adjustment is not changing, That is distributed on the remaining blind stitch by sending and decreasing the length of a blind stitch simultaneously in consideration of the slide between a device and sewing materials, The Seams form which has very uniform appearance in the terminal point defined beforehand thus about the length of a stitch simultaneously with it other than carrying out puncture correctly is attained. When the superfluous length of the equality of a blind stitch form is slight, a blind stitch is decreased by regulation of a blind stitch adjustment, On the other hand, although the small length of the beginning of the last blind stitch that occurs when superfluous length is size further improves by enlarging a blind stitch and distributing it by regulation of a blind stitch adjustment, in being this latter, the number of blind stitches decreases only by one. The size of the angle between the first edge of the material with Sewing of sewing materials and the next edge is inputted into the memory storage of the switching circuit controlled by a program via the input device provided with the keyboard, for example like the interval of the blind stitch to the edge of sewing materials. As for the interval of a blind stitch, it is possible for fixed intermediary To have to sandwich the angle to which one and the different edge which carries out an intermediary set are different in one corner in only one sewing materials generally with a number belonging to the same sewing materials or production Lot of sewing materials. Therefore, it is not convenient to memorize the quantity of various different angles with an input device, and while Sewing attachment advances, direct measurement Perilla frutescens (L.) Britton var. crispa (Thunb.) Decne. is carried out about sewing materials, It is convenient to lead to the switching circuit controlled by a program just before the amendment process for the remaining blind stitch located ahead of the last point which should be scanned starts. Since sewing materials sew on and the angle between the first edge of material and the next edge is measured, the 2nd and 3rd sensors can be arranged ahead of the 1st sensor. To the sending direction, these separate an interval mutually and are located in a transverse direction. Under the present circumstances, the quantity of an angle corresponds to total of the pulse of the pulse dispatch machine recorded on within a time [ between the responses of two sensors, the 2nd sensor and the 3rd sensor, arranged to the sending direction at a transverse direction ]. When sewing the blind stitch of a Noodle corner to two rows by 2 needle sewing machine which has a needle bar which can cancel connection separately, the point of the corner of an inside blind stitch is controlled by regulation which the regulation means which acts on an adjustment suited by the switching circuit controlled by a program like the last point of the blind stitch of one row. After canceling connection of an inside needle bar, an outside blind stitch is sewn on to the last point of that, and the number of puncture is defined by the switching circuit currently again controlled by the program depending on the length of a stitch, and the case in that case. since it will not become if the length of a blind stitch does not have A foreigner equally to the length of the blind stitch of the portion of other blind stitches in most in the remaining portion of an outside blind stitch Before the operation start sewn on, a puncture centering control device is adjusted beforehand, taking the angle between the edges of sewing materials, and the mutual interval of the sequence of a parallel blind stitch into consideration, and it is at an outside blind stitch thus, Regulation must be performed so that the blind stitch of the length of the blind stitch from which the integral multiple of one more puncture or one puncture hardly changes may be formed after dissociating an inside needle bar. one of the two sensors, the 2nd sensor for according to another formation of the object of the present invention, being arranged ahead of the 1st sensor and measuring the actual value of the amount of sewing-materials sending, and the 3rd sensor, -- the members forming of a scanning device -- intermediary To have. Under the present circumstances, it exists depending on the case. The sum of the pulse from the pulse dispatch machine recorded on within a time [ between the responses of two sensors, the 1st sensor and the 2nd sensor arranged almost simultaneously by the quantity of the slide between a sending device and sewing materials ], It corresponds to a difference with a number of a pulse of sums calculated from the quantity of sending set as the adjustment in consideration of the amount of sending in case there is no slide of sewing materials. According to [ since it is not only dependent on material, but it can be dependent on the number of rotations of a sewing machine of the slide between a sending device and sewing materials ] another formation of the object of the present invention Reduction of the number of rotations of a sewing machine is carried out at exactly good time by the 4th sensor arranged ahead of the sensor attached conventionally, and a sewing machine is thus operated by fixed low-speed rotation between sending measurement processes so that the edge following the next of sewing materials may be scanned. EXAMPLE The present invention is explained below in detail by the example shown in the attachment figure. Sewing machine 1 by which only the part is shown in Drawing 1 has arm 2 and head 3. Arm shaft 4 currently supported movably inside arm 2 drives taking sleeve 7 via crank 5 and coupling rod 6. Led so that needle bars 8 and 9 of left-hand side and right-hand side are slippery and may move to the inside of taking sleeve 7, these needle bars have small board 10 of a transverse direction, respectively. Two devotion levers 11 and 12 are supported movably by taking sleeve 7. The upper end portion of devotion levers 11 and 12 is formed as Entrainment hook, small board 10 of the transverse direction is held in the connecting position shown in the figure, and needle bars 8 and 9 are combined with taking sleeve 7 by that in shape restraint. The back end of devotion levers 11 and 12 is supporting projection part 13 bent by the transverse direction. Trouble of the rotation of change axis 14 is made possible to the inside of head 3, and the change axis has a section of a semi-circle in most in the range of devotion levers 11 and 12 which exercises up and down. Devotion levers 11 and 12 and change axis 14 are the members forming of operation device 15, and this operation device is described as the first example in the West Germany utility model No. 1972377 specification, and is the same as the operation device shown in the 1st and 2 figure of that specification. Lever 16 adhered to the lower end of change axis 14, and it has connected the lever with piston rod 18 of compressed air cylinder 19 via fork-like head 17. The casing of compressed air cylinder 19 adheres to the casing of 2nd compressed air cylinder 20, and piston rod 21 of this cylinder is pivoted via joint piece 22 by support board 23 which adhered to head 3. Change axis 14 is rotated in three different change positions by two compressed air cylinders 19 and 20 connected to a line. Needle bars 8 and 9 are supporting one needle 24, respectively. Two control and material sending 25 which are not illustrated with needle 24 collaborate. Material sending 25 adheres to support object 27 currently supported movably by the lower part of needle plate 26 of the sewing machine shown in Drawing 5. Support object 27 encloses eccentric ring 28 at the end formed in the shape of a fork, and the eccentric ring adheres to axis 29 currently driven in synchronization by arm shaft 4. Eccentric ring 28 gives movement raised for every blind stitch formation process to material sending 25. Support object 27 is connected with crank 30 formed in the shape of a fork, and this crank adheres on rocking axis 31. Since rocking axis 31 is driven, eccentric ring 33 adheres to axis 32 currently driven in synchronization like the front by arm shaft 4, and joint combination of the eccentric lever 34 of this eccentric ring is carried out at pin 35. this pin -- connection -- pestle 36 is supported movably -- the connection -- the pestle is connected with crank 38 which adheres to rocking axis 31 by pin 37. eccentricity -- in the side of pestle 34, it is connection on pin 35 -- pestle 39 adheres -- this connection -- the pestle is holding pin 41 currently supported by crank 40. connection -- the effective length of pestle 36 is connection -- it is equal to the effective length of pestle 39. as a result, the time of two pins 37 and 41 being mutually located in a line on the straight line -- rocking axis 31 -- eccentricity -- even if pestle 34 is moving, it will be in a state of rest. the eccentricity which acts on rocking axis 31 -- in order to change movement of pestle 34, a diameter is firmly clamped by Noodle regulating axis 42 in a completely different class, and, as for the regulating axis, crank 40 is supporting regulation crank 43 further. it is revolution to the surroundings of axis 46 in which engaging of clutch of this crank was carried out to the end of revolution lever 45 via spheroid joint tension stick 44, and the revolution lever carried out position fixation -- possible intermediary To have. Another free end of revolution lever 45 had spherical projection part 47, and it has projected this projection part between two side walls of regulation cam 48 of regulation ring 49 currently supported movably rotatably. surrounding regulating axis 42 -- one end -- the regulating-axis top -- and rotation spring 51 in which the other end adheres to opportunity frame 50 of sewing machine 1 has always forced projection part 47 of revolution lever 45 on one side of the side wall of regulation cam 48. Members forming 39 thru/or 51 forms device 52 which adjusts the size of sending movement of material sending 25, and in this case, regulation cam 48 is formed spirally, and while the blind stitch is 0 thru/or 6 mm in length, it is adjusted. As for the circumference of regulation ring 49, Worm gear 53 is formed and Worm 54 fits into this. Worm 54 adheres to axis 55 of stepping motor 56, and the stepping motor is arranged on board 57 of machine frame 50 so that it can adjust. The potentio meter 58 is arranged in the place of opportunity frame 50 at the extension top of regulating axis 42, and regulation member 59 which is the The potentio meter adheres in the direction punching of an axis of regulating axis 42. The potentio meter 58 is combined with the input edge of microprocessor 61 (Drawing 2) via lead 60, and the microprocessor forms the switching circuit controlled by a program. On support object 62 arranged at head 3, distance is separated before two needle bars 8 and 9 in the sending direction, Or the 1st sensor 64 adheres to this side in the position which separated distance from control 63 shown in Drawing 2nd [ the ] or 5 with the schematic illustration, the 1st sensor 64 comprises an optical dispatch machine and a euphotic machine, and it is Standing. The 1st sensor 64 collaborated with reflective foil (Reflexfolie) 65 (Drawing 5) which adheres on needle plate 26, and it has combined it with the input edge of microprocessor 61 via lead 66. By reaching scanning point 68 shown in the 3rd and 5 figure, light 67 emitted from the optical dispatch machine of the 1st sensor 64 is reflected by the euphotic machine, when reflective foil 65 is exposed. It is Usefulness intermediary To have as scanning device 70 to separate distance before the 1st sensor 64 on support object 62, for the 2nd same sensor 69 to be arranged, and for this 2nd sensor 69 detect the quantity of sending movement of sewing materials W in combination with the 1st sensor 64. Light 71 of the 2nd sensor 69 enters into scanning point 72 (Drawing 5). The 2nd sensor 69 is combined with the input edge of microprocessor 61 via lead 73. It is Usefulness intermediary To have for separating distance to the near side of needle 24 to the 2nd sensor 69, the same kind as the above of the 3rd sensor being arranged at support object 62, and the 3rd sensor 74 defining the quantity of angle alpha between two edges K1 and K2 of sewing materials W in combination with the 2nd sensor 69. Light 75 of the 3rd sensor 74 enters into scanning point 76. The 3rd sensor 74 is combined with the input edge of microprocessor 61 via lead 77. On support object 62, distance is separated ahead of the 2nd sensor 69, the same kind as a front of the 4th sensor 78 is arranged at it, and light 79 of this 4th sensor 78 enters into scanning point 80, and the 4th sensor 78 is connected to the input edge of microprocessor 61 via lead 81. Scanning points 68, 72, and 80 are located on straight line 82 (Drawing 5) which has extended in parallel with the direction V of sending. Pulse dispatch machine 83 shown by the schematic illustration in Drawing 2 adheres to arm shaft 4, and includes pulse disk 85 provided with many slit marks 84, and light scanning apparatus 86 which answers this slit mark. Pulse dispatch machine 83 is combined with the input edge of microprocessor 61 via lead 87. Slit mark 84 exists in some pulse disks 85. That is, it exists only in the portion which passes light scanning apparatus 86 between the phases of sending of material sending 25. Thus, pulse dispatch machine 83 sends a pulse to microprocessor 61 only between the phases of sending of sewing machine 1. Or it is clear that it is also possible to intercept connection with lead 87 certainly using the pulse dispatch machine which sends the pulse between 1 rotations of arm shaft 4 when it is not a phase of sending. Input device 89 shown by the schematic illustration in Drawing 2 is further connected to microprocessor 61 via lead 88, and this input device possesses the keyboard for making data input. One outgoing end of microprocessor 61 is combined with the switching circuit of stepping motor 56 publicly known and unillustrated via lead 90. Another outgoing end of microprocessor 61 is combined with the switching circuit of publicly known and unillustrated positioning motor 92 via lead 91, and the motor is carrying out drive combination with arm shaft 4 of sewing machine 1 via belt driving apparatus 93. The two remaining outgoing ends of microprocessor 61 are connected to two change magnets of method change-over valves 96 and 97 of 2 position 4 via two amplifiers and two leads 94 and 95 which are not illustrated. It is useful for change-over valves 96 and 97 to carry out the control operation of the compressed air cylinders 19 and 20, and the source of compressed air is shown by 98 in that case. The operation mode of the sewing machine of the present invention is as follows. It is described that corner blind stitch 99 of one row on sewing materials W which have the next edge K2 which has extended right-angled to the first edge K1 of material with Sewing first sews on. Usually, the blind stitch of one row is formed by 1 needle sewing machine. In order to describe simply, the blind stitch of one row will be sewn on using the two Like needle sewing machine mentioned above. In this case, the command which change-over valve 97 switches to another position from the position shown in Drawing 2 is given to microprocessor 61 via input device 89, Switching control of the compressed air cylinder 19 is carried out by that, and lever 16 circles, and change axis 14 revolves a connection release position in devotion lever 11 thus. Thus, left-hand side needle bar 8 has connection to a Across drive canceled at the whole period of blind stitch formation, and fixed support is carried out in the top dead center position of the needle bar. The quantity of the length of a blind stitch is further given to microprocessor 61 via input device 89, and blind stitch 99 is formed by the length. Microprocessor 61 gives the command corresponding to the above to stepping motor 56, and a stepping motor rotates regulation ring 49 by that. Rotational movement of regulation ring 49 is transmitted to regulating axis 42 via revolution lever 45, spheroid joint tension stick 44, and regulation crank 43. Under the present circumstances, the position of coupling rod 39 to coupling rod 36 changes, and thus, eccentric ring 33 expects material sending 25, and gives sending movement corresponding to the length of the blind stitch of a passage. Rotational movement of regulating axis 42 which arises when setting up the length of a blind stitch produces in analog change of the resistance of The potentio meter 58 combined with the regulating axis 42. This value that simulates the length Lst of the set-up blind stitch is given to microprocessor 61 like a front. Finally in addition, the quantity of interval a of the first edge K1 of sewing materials W and blind stitch 99 is given to microprocessor 61 via input device 89. In the case of sewing materials W which have the next edge K2 following this which has extended right-angled to the first edge K1 of a blind stitch, blind stitch 99 must finish in respect of [ E ] the equal corner distant [ distance length ] from both edges K1 and K2. After giving data required with Sewing, it sews on, and a process is carried out. The next edge K2 passes through the bottom of the 4th front sensor 78 first near the termination of a process with Sewing. As soon as it exposes in point 80 scanning [ reflective foil 65 Ga ], the 4th sensor 78 gives a switching pulse to microprocessor 61. Then, it can switch to the low-speed rotation as which the microprocessor was able to determine positioning motor 92 beforehand by this switching pulse, and can be stopped by sewing machine 1 in the low-speed rotation that there is no delay after that. The next edge K2 passes through the bottom of the 2nd two sensor 69 and the 3rd sensor 74 simultaneously after that. As soon as reflective foil 65 is exposed at scanning points 72 and 76, as for the 2nd and 3rd sensors 69 and 74, a change pulse is given to microprocessor 61, respectively. Since simultaneous Occurrence of the two change pulses is carried out, microprocessor 61 gets to know that the next edge K2 is making angle alpha=90 * to the first edge K1. Under the present circumstances, from intermediary To have with a distance equal to a over the next edge K2 of point E of the corner appointed beforehand, the change pulse of the 3rd sensor 74 does not give any change to an operation of others of microprocessor 61 in this case. The change pulse of the 2nd sensor 69 makes the pulse sent from pulse dispatch machine 83 only in the phase of sending each time from the time of this occurring add in the memory storage of microprocessor 61. And addition is continued until this 1st sensor 64 gives a change pulse to microprocessor 61, when the next edge K2 passes through the bottom of the 1st next sensor 64 and reflective foil 65 is exposed at scanning point 68. Thus, the sum of the pulse of pulse generator 83 corresponding to an actual motion of obtained sewing materials W, It is compared with the number of the pulses calculated by microprocessor 61 at the same time, and this number is obtained by doing division of the interval of scanning points 72 and 68 by the factor memorized by microprocessor 61 depending on the length Lst of the set-up blind stitch. The sum of the pulse of pulse dispatch machine 83 will become equal correctly at the number of the pulses calculated by the factor depending on the interval between scanning points 72 and 68, and the length Lst of an original blind stitch, if a slide did not occur between the phases of sending between material sending 25 and sewing materials W. However, in the usual case, a slide occurs between material sending 25 and sewing materials W, and especially the quantity of this slide is influenced with the thickness of sewing materials, elasticity, and the surface characteristic. Since there is a slide, the sum of the pulse of more pulse dispatch machines 83 in the time interval between two change pulses of the 2nd and 1st sensors 69 and 64 than the case where it is sending without a slide is recorded. Under the present circumstances, the quantity of the whole slide is equal to the difference of the sum of the recorded pulse, and the numerical value of the calculated pulse. :L=Lst-Z in which it compares with blind stitch length Lst adjusted, and microprocessor 61 calculates as follows small blind stitch length L of blind stitch 99 realized in fact when a slide occurs₁/Z₂Under the present circumstances, Z₁The numerical value and Z of a pulse which were Is calculated(ed)₂It is the sum of the pulse recorded on the time interval between two change pulses, the 2nd sensor 69 of Is, and the 1st sensor 64. Microprocessor 61 starts an operation with dispatch of the change pulse by the 1st sensor 64 located back, If Sewing attachment is carried out, without calculating length L of the actual blind stitch beforehand detected by the microprocessor, and changing regulation of adjustment 52 after the response of the 1st sensor 64, it will be computed what kind of length the remaining length S sewn on becomes. Since it is completely accidental that the start of the phase of sending arises simultaneously when the change pulse of the 1st sensor 64 located back is sent, it is in microprocessor 61, Remaining length L of the blind stitch started by totaling the pulse of pulse dispatch machine 83 generated by the termination of a blind stitch from the response time of the 1st sensor 64 located back_RIt detects. :S=L by which the remaining length S sewn on is calculated by the following formula_R+ n-L However, n is the number of the perfect blind stitches after the response of the 1st sensor 64 located back. In Drawing 3, point 100 shows the position relevant to sewing materials W at the time of passing scanning point 68 of the 1st sensor 64 that the next edge K2 of needle 24 of needle bar 9 connected mutually is located back. It projects exceeding point E of the corner appointed beforehand, and length S which the remainder sews on in the example of the blind stitch shown in Drawing 3 is in that case L._ALength (it is called the prescribed range length) and L from a point of the beginning of the blind stitch of Is the last to point E of a corner_BIt is the excessive length of the blind stitch of Is the last. Next, remaining length L of the blind stitch in which microprocessor 61 has begun material sending 25, the slide between sewing materials W, and sewing_RAmount of of, and prescribed range length [ of the last blind stitch ] L_AAnd excessive length L_RLength L by which blind stitch 99 which must continue Sewing attachment after the response of the 1st sensor 64 in order to make it the last puncture finish in respect of [ E ] the corner appointed beforehand correctly after taking into consideration several n of a perfect blind stitch was amended_KIt computes. Length L excessive when the remainder sews and it calculates length S of the price_BIt is Is small and is prescribed range length L._AIn being But size, it decreases the length of a blind stitch, and it is excessive length L._BIt is made to distribute to the n remaining blind stitches. Under the present circumstances, length [ which is sewn on ] S of the amended remainder_K:S calculated by the formula of Is the next_KI=S-L_B=L_R+ n-L_KI=L_R+(L-L_B/n) Length L excessive when calculating length S with the remaining Sewing_BIt is But size and is prescribed range length L._AWhen it is Is small, it is prescribed range length [ of the last blind stitch ] L._AIt is allotted by Is, the length of a blind stitch is increased, and the number of the blind stitches of the remainder in that case decreases only by one. Length [ which is sewn on ] S of the amendment Now remainder_K:S calculated by the formula of Is the next_K=S-L+L_A=L_R+(n-1)L+L_A=L_R+(n-1)L_K=L_R+(n-1)(L+L_A/(n-1)) Length [ of the blind stitch immediately set as stepping motor 56 beforehand with the quick processing speed of microprocessor 61 after the response of the 1st sensor 64 located back as a matter of fact ] L_stAnd length [ of the blind stitch computed and amended ] L_KThe regulation command corresponding to a of difference is told, and stepping motor 56 is adjusted in the mode which suits adjustment 52. Length [ of the amended blind stitch ] L_KSince the slide between material sending 25 and sewing materials W which are generated depending on the case is taken into consideration and compensated when calculating, blind stitch 99 is ended in respect of [ E ] the corner appointed beforehand correctly. Prescribed range length [ of the blind stitch of the last of length S with the remaining Sewing calculated simultaneously with it ] L_AOr excessive length L_BLength [ of the amended blind stitch which is obtained in this case since it is uniformly distributed to the blind stitch of Is a large number ] L_KIt only differs from length L of the blind stitch of blind stitch 99 besides Is merely slightly. Thus, about the length of a blind stitch, the blind stitch appearance which looks very uniform is acquired. :b=a/sinalpha by which distance b from point E of a corner to the next edge K2 will be calculated by the following formula if angle alpha of Komata is size from 90 * a is an interval of the blind stitch and edge which were mentioned above here. Under the present circumstances, the quantity of angle alpha is equal to the sum of the pulse from pulse dispatch machine 83 recorded within the time interval [ two sensors the 2nd located in the center and the 3rd, 69 and 74 answer ] of a between. Length [ which is sewn on ] S of the remainder amended when alpha was 90 * since it was sin90 *=1_KOr length [ of the amended blind stitch ] L_KIt is alike and does not have any influence. In contrast, length [ which the amended remainder sews on when alpha differs from 90 * ] S_KOr length [ of the amended blind stitch ] L_KWhen calculating, it has a consequence of having Suitableed. When sewing the blind stitch of a Noodle corner on two rows, point E1 of the corner of blind stitch 101 (Drawing 5) of the inner side located in the distance of c to the next edge K2 is controlled by adjusting adjustment 52 suitably by microprocessor 61 like point E of the corner of blind stitch 99 of one row. After the blind stitch of the last of inside blind stitch 101 is completed in respect of [ E1 ] a corner, needle bar 8 has connection to a drive canceled in the top dead center position of that. for this reason -- being alike -- microprocessor 61 is a change about change-over valve 97 -- and devotion lever 11 is thus revolved by the connection release position. after connection of needle bar 8 is canceled, outside blind stitch 102 is sewn on to point E2 of the corner of that -- that time -- portion d of this remaining blind stitch -- an intermediary -- depending on the length of a required blind stitch, and the case, the number of blind stitches is again calculated by microprocessor 61. After the blind stitch of the last of outside blind stitch 102 is completed in respect of [ E2 ] a corner, sewing machine 1 stops, after needle bar 9 has stopped in the lower dead center position, and it to sewing materials W are rotated by the surroundings of needle 24 which now serves as the axis of rotation, and are located in edge K2 in parallel with the sending direction V. As soon as sewing materials W are rotated by the new position, sewing machine 1 is operated again and outside blind stitch 103 is sewn on only using point Needle bar 9. When outside blind stitch 103 reaches length equal to length d of the remaining blind stitch of blind stitch 102, microprocessor 61 makes needle bar 8 connect with a drive again, and returns an adjustment to the value set as Beginning. After this time, two blind stitches 103 and 104 are sewn on by the length of an equal blind stitch like blind stitches 101 and 102 in front of an amendment phase.

[Brief Description of the Drawings]

Drawing 1 is a perspective view of the drive mechanism of 2 needle sewing machine which has a needle bar which connection to a drive can cancel separately, Drawing 2 is a schematic illustration showing connection between the elements which differ in a variously different instrument for the device of model sewing, these mutuals, and a sewing machine variously, Drawing 3 is a schematic illustration in which sewing on and showing two examples of a process the corner by the blind stitch which is not amended sews on, and according to a process and the amended blind stitch, Drawings 4 are a schematic illustration in which the corner of the sewing materials which have the edge which accomplishes an obtuse angle mutually and intersects it sewing on, and showing a process, and a schematic illustration in which the corner by 2 needle sewing machine sewing Drawing 5 on, and showing a process. 1 ...... A sewing machine, 4 ...... An arm shaft, 52 ...... An adjustment, 56 ...... A stepping motor, 61 ...... A microprocessor, 64, 69, 74, 78 ...... A sensor, 70 ...... A scanning device, W ...... Sewing materials, K1 [ ...... The first edge of material with Sewing, K2 ] [ ...... The next edge following the first edge, alpha ] [ ...... An angle V ] [ ...... The direction of sending. ]