Grip cylinder

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a grip body summarized in claim 1.

【0002】

[Problems to be Solved by Conventional Techniques and Inventions]

The grip cylinder is used in a sheet-fed printing machine, for example, as an impression cylinder. This impression cylinder needs to be configured with a grip claw, especially a row of grip claws, to hold the sheet of paper. For the grip claw or the grip claw row, for example, the sheet is picked up from the paper feed cylinder or directly from the paper feed table, and after the sheet paper is printed, the sheet paper is passed to the paper feed cylinder via the taxiway. It has a function to hang. And, in the superordinate concept, such a transfer body is also intended to fall into the category of a grip body. In addition, the grip body provided in the folding mechanism also falls into this category.

【0003】

Well-known grip body, eg European Patent EP-0-061-607-B1 In the sheet paper delivery cylinder specified by No., the opening and closing of the grip claw is mechanically controlled by the control cam. The control cam forms an inner cam (inner control cam) or an outer cam (outer control cam), and the cam roller is pressed against the inner cam or the outer cam by the urging force generated by the spring. As a result, the outer cam and the inner cam perform pressure contact control of the cam roller. At this time, a shaft cam having one side or both sides is provided. In such a cam system, a certain pre-given cam curve needs to be repeated at each rotation. Also, when the movement of the grip claw is required to repeat once in two rotations instead of repeating every one rotation (in such a case, it occurs in the grip cylinder and the receiving cylinder in the folding mechanism). Requires a separate control cam. This control cam is directly connected to the first control cam to form the periodicity as described above. Due to the impression cylinder of the sheet-fed printing press formed as a grip cylinder, the surface of a rubber cylinder having a circumference several times the circumference of the impression cylinder, for example, a plate cylinder having four printing plates, or The case where the sheet of paper attached to the impression cylinder surface passes directly through the surface of the plate cylinder also corresponds to the above case. In such a case, the sheet paper needs to be held by the impression cylinder for a time corresponding to a plurality of rotations. This rotation speed corresponds to the ratio of the circumference of the plate cylinder to the circumference of the impression cylinder. Therefore, if four printing plates are provided on the plate cylinder, the rotation speed is four.

【0004】

According to German Patent DE-PS-259-237, the grip claw closing mechanism for the grip body in the printing machine is disclosed. In this mechanism, an electromagnet controlled by a fixed disk-shaped contact plate is installed inside the body. Then, when an electric current is passed through this electromagnet and a magnetic field is generated in the anchor installed on the claw shaft, the electromagnet moves this anchor. In addition, German Patent DE-AS-21-13-750 discloses a grip body with a grip claw. In this grip body, the movement of the grip claws in both directions is controlled by an electromagnet installed inside the grip body. Both of the above electromagnets are energized by a sliding ring installed outside the body.

【0005】

An object of the present invention is to provide a grip body that can be controlled by a simple electromagnetic method.

【0006】

[Means for solving problems]

The above problem is solved by a grip cylinder based on the technique shown for the first time, as described in claim 1.

【0007】

According to the present invention, the electromagnet is fixedly installed on the outside of the grip body. The magnetic field generated in the anchor by passing an electric current through the electromagnet makes it possible to control by a simple method that does not use slip contact. This prevents the electromagnet from rotating with the grip.

【0008】

According to a preferred embodiment of the present invention, when the grip claw is given an operation that is not synchronized with the rotation speed of the grip cylinder, or when the grip claw is moved only once during n rotations of the grip cylinder, this is performed. A simple control mechanism to realize it is provided. This results in a significant simplification of the mechanical structure.

【0009】

Even though only one control cam is provided, the same curved path is not repeated for each rotation of the grip. That is, it is possible to realize arbitrary cycle control. At this time, the second control cam is reduced, and the springs and cam rollers required for this control cam are also reduced. The electrically controllable control cam according to the present invention is also used as a component of an electromagnet at the same time. The present invention is characterized in that only a small amount of mechanical adjustment is required.

【0010】

Other preferred embodiments of the present invention are manifested by the dependent claims.

【0011】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a side sectional view showing a grip cylinder provided with a grip mechanism. FIG. 2 is a side sectional view different from FIG. 1 showing a grip body with an anchor. FIG. 3 is a cross-sectional view showing a grip body. FIG. 4 is a side view and a cross-sectional view showing two electromagnets formed as a fixed circular ring.

【0012】

As shown in FIG. 1, the grip body 1 is rotatably installed in the printing machine via the shaft 2. The grip cylinder 1 is configured to have a claw shaft 3 having a plurality of individual grip claws 4, and the grip claws 4 sandwich the printing paper or sheet of paper with respect to the claw base 5. .. The claw base 5 is fixed to the body of the grip body 2 by bolts 6. The grip claw 4 is rotatably attached around the rotating shaft 7. The lower edge 40 of the grip 4 is pressed against the upper edge 50 of the claw base 5 by the push spring 8 fixed to the grip 4 on the one hand and the body of the grip 1 on the other hand. , The edge of the sheet of paper is retained. FIG. 1 shows the open state of the device 3.

【0013】

As shown in FIG. 2, the cam roller 10 rotatably attached around the rotating shaft 100 on the claw shaft 3 can rotate together with the anchor 9 in common with respect to the rotating shaft 7. While the electromagnet, i.e., the magnetic field in the anchor 9 is not generated by passing an electric current through the stator 12, the claw shaft 3 is directed by the push spring 8 around the rotating shaft 7 toward the shaft 2 of the grip body 1. The state of being urged to rotate is maintained, whereby the holding state of the grip claw 4 is maintained. At least the region 11 is provided with a stator 12 (shown in FIG. 3) formed in a substantially arcuate shape. The protrusion 130 protruding from the housing 13 of the stator 12 forms an outer cam with respect to the cam roller 10 in the region 11. When an electric current is passed through the stator 12 and the housing 13 is magnetized, the resulting magnetic force attracts the anchor 9 and cam roller 10 to the protrusion 130 in region 11, thereby forming from the protrusion 130. The cam roller 10 is pressed against the outer cam. Both the anchor 9 and the housing 13 are made of a magnetizable material that is not a permanent magnet. When the grip device 3 is opened, for example, at position A, the sheet of paper is housed in the grip device from the paper feed cylinder, and the grip device rotates in the direction indicated by the arrow C. Reach a new area 14. The stator 12 is not provided in this region 14, and the grip claw 4 is closed again by the restoring torque of the push spring 8.

【0014】

According to another embodiment, the stator 12 is formed as a concentric ring surrounding the end face of the grip body 1, and the protrusions 130 are provided in the regions 11 and 14 accordingly. When a current is passed through the stator 12, the cam roller in the region 14 is pressed and controlled in the direction of the shaft 2 to rotate, and holds the sheet of paper at that time. This operation continues until the cam roller reaches region 11 again.

【0015】

In each of both embodiments, when necessary, the pressing force of the push spring 8 or the pressing control in the region 14 holds the sheet once sandwiched by the grip claw 4 for as long as necessary. When it becomes necessary, it is possible to generate a magnetic field in the housing 13 in the stator 12 in the region 11 to release the sheet again. That is, it is possible to sequentially feed the sheet paper to the taxiway arranged at the point B. When the grip cylinder 1 is used as an impression cylinder in a sheet-fed printing machine and the sheet-fed paper is printed in four colors by a plate cylinder having a size four times as large as the impression cylinder, the sheet-fed paper is placed on the taxiway. Before being fed, it must be held on the outer surface of the impression cylinder during four revolutions of the impression cylinder. Then, a magnetic field must be generated in the housing 13 before the impression cylinder makes four turns and the sheet of paper reaches region 11 from region 14, which causes the anchor 9 to swivel outward. The grip claw 4 is separated from the sheet of paper.

【0016】

As shown in FIG. 3, the grip body 1 is installed between the side wall portion 16 and the side wall portion 17 by two rows of ball bearings 15.

【0017】

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a grip cylinder 1 that can be incorporated as an impression cylinder of a sheet-fed printing press, a paper feed cylinder or a transfer cylinder of a sheet-fed printing press, or as a grip cylinder of a folding mechanism. In the present invention, instead of using a mechanical cam control device, the grip claw 4 is swiveled by using an anchor 9 which is magnetizable and swivel with the cam roller 10 instead of a permanent magnet. At this time, when a current is passed through the stator 12, the housing 13 of the stator 12 is magnetized, whereby the anchor 9 is attracted toward the housing 13 against the restoring torque of the push spring 8.

【0018】

As shown in FIG. 2, instead of guiding the cam roller 10 by the outer cam, it is possible to guide the cam roller 10 by the inner cam by using the same method. In this case, the stator 12 is formed as a ring between the shaft 2 and the cam roller 10, and the stator 12 is covered by a housing corresponding to the housing 13 shown in FIGS. 2 and 3. Further, instead of providing only one claw shaft 3 having a plurality of grip claws 4 on the grip cylinder, it is possible to provide a plurality of claw shafts 3. At this time, for example, three individual claw shafts 3 are provided on the surface of the grip body 1.

【0019】

Instead of using the push spring 8, a permanent magnet or another electromagnet is used with the stator 12', housing 13', and protrusion 130', as shown in FIGS. 4 (a), 4 (b) (arrows). As shown in D) it is possible to rotate the anchor 90 in both directions. At this time, when a current is passed through either one of the two electromagnets or a strong current is passed through one of them, a large torque is applied to the anchor 90, which causes the claw shaft 3 to be rotated. Then, in the closed state, the claw base 5 also functions as a stopper for the grip claw 4 and the anchor 90. Further, another stopper for the anchor is formed by, for example, a bolt attached to the end face of the grip body 1. In this case, the control cam and cam roller are unnecessary.

【0020】

Further, the electromagnet can be fixedly installed on one end face portion of the grip body (shown in FIG. 3) or both end face portions. When there is one electromagnet, the torque acting in the opposite direction to the torque generated by the push spring 8 or the permanent magnet is applied to the anchor 9 or the anchor 90 by the electromagnet, and the electromagnet is fixedly installed.

【0021】

The electromagnet is controlled independently of the movement of the grip body 1, for example, by an encoder. And, as with the magnetic attraction, it is also possible to utilize the magnetic repulsive force generated by magnets or electromagnets with the same poles facing each other.

[Simple explanation of drawings]

[Figure 1]

It is a side sectional view which shows the holding body provided with the holding mechanism.

[Figure 2]

It is a side sectional view different from FIG. 1 showing a grip body equipped with an anchor.

[Fig. 3]

It is sectional drawing which shows the addition body.

[Fig. 4]

It is a side view and a sectional view which shows two electromagnets formed as a fixed circular ring.

[Explanation of symbols]

1 Addition body 3rd axis 4 Mouth claws 5th stand 8 spring 9,90 anchor 10 cam roller 12,12'stator (electromagnet) 14 Stopper 130,130'Protrusion (housing member)