JP2003291305A - Gripper driving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gripper driving apparatus wherein adjustment of timing for delivery of sheet paper can be easily carried out, and in printing, designing of a printing cam surface for controlling action of a gripper is easy. <P>SOLUTION: An adjusting cam surface is provided separately from the printing cam surface. A quasi-paper delivery part falsely reproducing a posture of a gripper when sheet paper is delivered in printing at a position different from a delivery position in printing is provided on the adjusting cam surface. The abutting cam surface of a cam follower can be changed from the printing cam surface to the adjusting cam surface. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripper drive device, and more particularly to adjustment of sheet delivery timing.

[0002]

2. Description of the Related Art Generally, in an offset sheet-fed printing press which uses a sheet as a printing sheet, various cylinders are provided with grippers for holding the edge of the sheet. For example, a double-sided printing machine capable of switching between single-sided printing and double-sided printing as shown in FIG. 1 includes a paper feeding unit 1, a printing unit 2 and a paper discharging unit 3, and the printing unit 2 includes two printing units 4, 4. It is equipped with 5. A transfer cylinder 8 (first transfer cylinder), a storage cylinder 9 (second transfer cylinder), and a reversing cylinder 10 are provided between the two printing units 4 and 5.
Is provided, and the sheet is transferred from the impression cylinder 6 of the printing unit 4 on the upstream side to the impression cylinder 7 of the printing unit 5 on the downstream side. Specifically, at the time of double-sided printing, after one surface is printed by the upstream printing unit 4, it is reversed by the reversing cylinder 10 of the paper delivery unit and passed to the downstream printing unit 5, and remains. The other side is printed. Further, during single-sided printing, since the front and back sides are not reversed by the paper delivery unit, both printing units 4 and 5 perform multicolor printing on only one side. In the case of the printing machine shown in FIG. 1, two colors are printed on both sides during double-sided printing, and a total of four colors are printed on one side during single-sided printing.

In the printing machine having such a structure, the impression cylinders 6 and 7, the transfer cylinder 8 and the storage cylinder 9 are of a single-claw type that holds the front end of the sheet together with a nail seat (nail rest). A gripper 11 is provided, and the reversing cylinder 10 has a reversing gripper 1
3 is provided. The reversing gripper 13 is a double-nail type gripper that grips a sheet with a parent claw and a child claw, and grips the front end of the sheet during single-sided printing, and the rear end of the sheet during double-sided printing. Hold the part and turn it over.

Specifically, when performing single-sided printing, as shown in FIG.
As shown in FIG. 5, the reversing gripper 13 has a gripper 11 of the storage cylinder 9 in a posture in which a tip of a claw faces rearward in a rotation direction of the reversing cylinder 10 at a contact point between the storage cylinder 9 and the reversing cylinder 10.
Receive the sheet by holding the front edge of the sheet. Then, while maintaining that posture, the sheet rotates to the direction of the arrow P together with the reversing cylinder 10, and the sheet is delivered to the impression cylinder 7 at the contact point between the reversing cylinder 10 and the impression cylinder 7 on the downstream side. After that, after turning once by a predetermined angle toward the front side of the reversing cylinder 10 in the rotation direction, before turning to the counter contact point with the storage cylinder 9, it reversely turns toward the rear side in the rotation direction of the reversing cylinder 10 to turn the storage cylinder 9 Hold the front edge of the sheet at the contact point with. On the other hand, when printing on both sides,
As shown in FIG. 3, the reversing gripper 13 is suction-held by the paper suction device 12 of the storage cylinder 9 with the tip of the claw facing forward in the rotation direction of the reversing cylinder 10 at the contact point with the storage cylinder 9. Hold the rear edge of the sheet. And the reversing body 10
When the sheet is turned upside down by turning about 180 degrees toward the rear side in the rotation direction of the reversing cylinder 10 in accordance with the rotation of the
The sheet is delivered at the contact point with. After that, the reversing gripper 13 contacts the storage cylinder 9 again, and the tip of the claw is again contacted with the reversing cylinder 1.
In order to face the front side in the rotational direction of 0, between the counter contact point with the impression cylinder 7 and the counter contact point with the storage cylinder 9, the reversing cylinder 10 is turned approximately 180 degrees toward the front side in the rotational direction.

An example of a gripper driving device for driving and controlling the reversing gripper 13 is, for example, Japanese Patent Publication No. 56-2.
The one described in Japanese Patent Laid-Open No. 017 is known. As shown in FIG. 9, the reversing gripper 13 is mounted on the drive shaft 24 and rotates about the drive shaft 24 to perform an opening / closing operation and a turning operation. That is, the gripper drive device includes the drive shaft 2
Segment gear 31 having a pinion 29 attached to the end portion of No. 4 and a tooth portion 31a meshing with the pinion 29
(Driving gear). The segment gear 31
Is rotatably provided around a gear shaft 40 that is axially supported by the end surface of the reversing cylinder 10. A cam follower 35 is attached to the segment gear 31,
The cam follower 35 is mounted on the cam surface 33a of the disk-shaped cam member (not shown) fixed to the inside of the frame (not shown).
The segment gear 31 swings around the gear shaft 40 by traveling according to the rotation of the reversing cylinder 10. As the segment gear 31 swings in this way, the drive shaft 24 rotates by a predetermined angle, and the reversing gripper 13 performs the opening / closing operation and the turning operation as described above.

As described above, since the operation of the reversing gripper 13 is different between the double-sided printing and the single-sided printing, the gripper driving device is provided with the double-sided printing cam surface and the single-sided printing cam surface. The reversal gripper 13 is driven and controlled according to the printing state by switching the contacting cam surface.

By the way, in such various grippers, the timing at which the sheets are delivered is important. That is, the timing at which the sheet is received from the upstream cylinder and the timing at which the sheet is delivered to the downstream cylinder are important. If the delivery timing is off, delivery failure may occur. Therefore, if the delivery timing is off, adjustment is required. Also, since the grippers are arranged side by side along the axial direction of the body at intervals,
It is necessary to adjust the timing for each gripper so that each gripper opens and closes simultaneously to deliver sheets.

The adjustment of the delivery timing is performed by adjusting the delivery position, that is, the gap between the claws of the gripper at the delivery position and the delivery position. The gap between the claws of the gripper is the gap between the claw and the claw seat (claw base) in the case of the one-claw type, and the gap between the claws in the case of the two-claw type. For example, in the case of a double-claw type, if the gap between the two claws at the receiving position is larger than a predetermined value,
The timing of receiving the sheet becomes later than the regular one, and conversely, when the gap is smaller than the predetermined value, the timing of receiving the sheet becomes earlier than the regular one.
Therefore, it is necessary to adjust the gap to a predetermined value at the transfer position.

For this gap adjustment, a sheet having a predetermined thickness (for example, a thickness of 0.08 mm) generally called a reference sheet is used. Taking the case of a double-claw type as an example, by inserting this reference sheet between both claws at the delivery position, the gap at the delivery position is adjusted to be approximately the same as the thickness of the reference sheet. This gap adjustment may be performed at either the receiving position or the delivering position. Generally, since the delivery timing is adjusted sequentially from the upstream side along the paper feed, it is performed at the receiving position side.

For example, the reverse gripper 13 as described above.
In the case of 1, the sheet is received from the gripper 11 of the storage cylinder 9 at the contact point with the storage cylinder 9, and at the receiving position from the storage cylinder 9, the reference paper is used and the distance between the claws of the reversing gripper 13 is increased. Adjust the gap of.

[0011]

However, since the space for accommodating the adjusting tool between the storage cylinder 9 and the reversing cylinder 10 is small in the vicinity of the contact point with the storage cylinder 9, the work is originally performed. This is a difficult place to do. In addition, as can be seen from FIG. 1, since the receiving position from the storage cylinder 9 is located at the lower part of the printing machine, the operator must perform the gap adjustment work by diving under the reversing cylinder 10. Therefore, extremely large effort is required for adjusting the gap at the receiving position.

In order to reduce such work load,
By devising the shape of the cam surface, it is possible to simulate the posture in which the reversing gripper 13 receives the sheet at another position different from the actual receiving position, and to perform the gap adjustment at that position. Conceivable.

Specifically, a pseudo paper delivery position in which the reverse gripper 13 takes the same posture as the delivery position is provided between the delivery position to the impression cylinder 7 and the reception position from the storage cylinder 9. Therefore, in addition to the portion corresponding to the delivery position to the impression cylinder 7 and the portion corresponding to the receiving position from the storage cylinder 9, the cam surface has a portion having the same displacement amount as the displacement amount of the cam follower in those portions. Formed separately,
The cam follower is brought into contact with the portion corresponding to the pseudo paper delivery position, and in that state, the gap of the reversing gripper 13 is adjusted.

As described above, by forming a pseudo paper delivery portion on the cam surface for pseudo reproduction at a position different from the delivery position of the gripper when delivering sheets during printing, Since the gap can be adjusted at the pseudo paper delivery position where it is easy to work, the workability is improved.

However, there is a problem that it is not easy to design the pseudo paper delivery portion on one cam surface because of the design of the cam surface. In particular, since the reversing gripper 13 is a double-claw type and its turning center is located substantially on the outer peripheral surface of the reversing cylinder 10, the operation from the transfer position to the receiving position is more than that of a normal single-claw type gripper. The cam surface for the reversing gripper has a complicated shape than the cam surface for the one-claw type gripper. Therefore, it is actually extremely difficult to further provide the pseudo paper delivery section on the cam surface which is more complicated than the one-claw type. Also, in the case of a cylinder in which grippers are arranged at a plurality of positions at intervals in the circumferential direction, that is, in the case of a double or more cylinder, a plurality of cam followers are required corresponding to the number of positions of the grippers, and one A plurality of cam followers travel on the cam surface at the same time. Therefore, there are more restrictions on the design of the cam surface than on the cam surface in the case of a single cylinder, and even in that case, it is very difficult to separately form the pseudo paper delivery section on one cam surface.

In any case, there is a problem in that it is not easy to design the cam surface if the pseudo paper delivery portion is additionally provided on the printing cam surface for controlling the operation of the gripper during printing.

Therefore, the present invention has been made in view of the above-mentioned problems of the related art, and it is possible to easily adjust the delivery timing of the sheet and to control the operation of the gripper at the time of printing. An object of the present invention is to provide a gripper driving device whose surface can be easily designed.

[0018]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a gripper drive device according to the present invention is a printing device for controlling the operation of a gripper for gripping a sheet at the time of printing. A gripper drive device configured to drive and control the gripper by the movement of the cam follower, which comprises a cam surface for use and a cam follower that travels on the cam surface as the cylinder rotates, and separates from the printing cam surface. An adjustment cam surface is provided, and a pseudo paper delivery unit for artificially reproducing the attitude of the gripper when delivering a sheet at the time of printing at a position different from the delivery position at the time of printing is provided on the adjustment cam surface. It is characterized in that the cam surface provided and contacting the cam follower can be switched between the printing cam surface and the adjusting cam surface.

In particular, a support shaft rotatably supported by a bearing portion provided on the barrel and a cam lever fixed to the support shaft are provided, and a cam follower is provided on the cam lever. It is preferable that the bearing and the bearing move integrally.

Further, the outer peripheral surface of the body is provided with a separation movable portion which is separated from the other area of the outer peripheral surface, and a bearing portion is provided inside the separation movable portion so that the separation movable portion can be moved when the cam surface is switched. It is preferable that the portion and the bearing portion move integrally.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of the present invention will be described with reference to the drawings. However, duplicated description of the same components as those of the above-mentioned conventional one will be omitted, and substantially the same components will be described. The same reference numerals are given to parts having functions.

In FIG. 1, both the upper and lower impression cylinders 6 and 7 are double cylinders, the transfer cylinder 8 and the reversing cylinder 10 are also double cylinders, and the storage cylinder 9 is a triple cylinder. Therefore, in the storage cylinder 9,
A total of three grippers 11 and paper suction devices 12 are arranged at intervals of approximately 120 degrees, and the transfer cylinder 8 has
The grippers 11 for gripping the front end of the sheet are arranged to face each other by approximately 180 degrees, and the front end of the sheet is gripped by the reversing cylinder 10 for single-sided printing and the rear end of the sheet for double-sided printing. The reverse grippers 13 are arranged to face each other by approximately 180 degrees.

The reversing cylinder 10 shown in FIG. 2 is constructed so as to rotate integrally with the rotary shaft 20, and the rotary shaft 20 is rotatably supported by the left and right frames 21 and 22 via bearings 23. There is. The reversing cylinder 10 includes a reversing gripper 13
A pair of drive shafts 24 mounted with are mounted at positions facing each other by approximately 180 degrees. As shown in FIG. 2, the drive shaft 24 is parallel to the rotation shaft 20 of the reversing cylinder 10, and a plurality of reversing grippers 13 are arranged in parallel along the axial direction of the reversing cylinder 10. The respective reversing grippers 13 are the same at the same time. The operation of.

As shown in FIG. 7, the reversing gripper 13 is constructed so as to grasp a sheet by cooperation of the parent claw 25 and the child claw 26. The drive shaft 24 is composed of a claw tube 27 and a claw shaft 28 that is coaxially inserted into the claw tube 27. The claw tube 27 is for driving and controlling the child claw 26, and the claw shaft 28 is for driving and controlling the master claw 25. Therefore, the claw shaft 25 is fixed to the claw shaft 28, and the claw shaft 26 is fixed.
Is fixed to the nail tube 27. However, it may be fixed on the contrary.

As shown in FIG. 2, pinions 29 and 30 are attached to one end (left end in the drawing) of the claw tube 27 and the other end (right end in the drawing) of the claw shaft 28, respectively.
Mesh with segment gears 31 and 32 (driving gears) provided at both ends of the reversing cylinder 10. That is,
A gripper driving device for driving and controlling the child claw 26 is provided on one end side (left end in the drawing) of the reversing cylinder 10, and a parent claw 25 is driven and controlled on the other end side (right end in the drawing) of the reversing cylinder 10. A gripper drive is provided. Since the gripper driving device for the child pawl 26 and the gripper driving device for the parent pawl 25 have substantially the same configuration except for the cam members 33 and 34, the gripper driving device for the child pawl 26 will be mainly described below. explain.

FIG. 3 shows a gripper drive for the claw 26. The reversing cylinder 10 is a double cylinder and is provided with a pair of drive shafts 24 facing each other by approximately 180 degrees. Therefore, the cam followers 35, the segment gears 31, and the like for the child claws 26 have a point-symmetrical positional relationship with respect to the center of the reversing cylinder 10 so that the reversing gripper 13 is driven and controlled independently for each drive shaft 24. As described above, a pair is provided so as to face each other by approximately 180 degrees.

The segment gear 31 is formed in a fan shape of approximately 90 degrees and has a tooth portion 31a which meshes with the pinion 29 on the outer periphery thereof. The segment gear 31 is the drive shaft 2
4 is fixed to a gear shaft 40 that is parallel to the gear shaft 4, and the gear shaft 40 is rotatably supported on the end surface of the reversing cylinder 10. Therefore, the segment gear 31 rotates about the gear shaft 40 so as to swing together with the gear shaft 40 within a predetermined angle range. The gear shaft 40 is arranged on a line connecting the drive shaft 24 and the center of the reversing cylinder 10.

On the other hand, the cam follower 35 is provided at the tip of a cam lever 42 fixed to a lever shaft 41 (support shaft) arranged in parallel with the gear shaft 40. The lever shaft 4
1 is rotatably supported by the reversing cylinder 10, and the cam lever 42 rotates integrally with the lever shaft 41 with the lever shaft 41 as a fulcrum. In this way, the cam follower 35 is separated from the segment gear 31 and
It is provided on a cam lever 42 that rotates about a spindle different from. Therefore, a transmission means for transmitting the operation of the cam lever 42 to the segment gear 31 is provided. That is, as transmission means, two arm members 43 and 44 are provided between the lever shaft 41 and the gear shaft 40. One arm member 43 is fixed to the gear shaft 40 and rotates about the gear shaft 40 as a fulcrum, and a cam surface 43a is formed at the tip thereof. The other arm member 44
Is fixed to the lever shaft 41 and rotates about the lever shaft 41 as a fulcrum, and a roller 45 that comes into contact with the cam surface 43a of the one arm member 43 is attached to the tip end of the roller 45.
That is, a cam mechanism is composed of both arm members 43 and 44, and the operation of the cam lever 42 is transmitted to the segment gear 31 via the cam mechanism.

The operation of the cam follower 35 is amplified to a predetermined magnification by the cam lever 42 and both arm members 43 and 44 and transmitted to the segment gear 31.

The gear shaft 40 for the child claw 26 is arranged coaxially with the gear shaft (not shown) in the gripper driving device for the parent claw 25 arranged on the opposite end surface of the reversing cylinder 10. A torsion bar (not shown) as a torsion spring is connected between both gear shafts. The contact force between the roller 45 and the cam surface 43a of the one arm member 43 is maintained by the spring force of the torsion bar, and the cam followers 35 and 36 are pressed against the cam surfaces of the cam members 33 and 34.

The rotating direction of the reversing cylinder 10 is the direction of arrow P shown in FIG. Therefore, the cam follower on the child claw 26 side is located on the front side in the rotation direction of the reversing cylinder 10 with respect to the reversing gripper 13. On the contrary, the cam follower on the side of the main nail 25 is
It is located behind the reversing gripper 13 in the direction of rotation of the reversing cylinder 10.

Next, the cam member will be described. A cam member 33 for the child claw 26 and a cam member 34 for the parent claw 25 are provided inside the left and right frames 21, 22, respectively. On the outer peripheral surfaces of these cam members 33, 34, there are cam surfaces 33a, 34a for single-sided printing and a cam surface 33 for double-sided printing.
b and 34b are juxtaposed along the axial direction of the reversing cylinder 10. When switching between double-sided printing and single-sided printing, the cam followers 35, 3 are moved by moving both cam members 33, 34 along the axial direction of the reversing cylinder 10.
The cam surface with which 6 abuts is switched. The movement of the cam members 33, 34 is performed by a known driving means such as an air cylinder. In this way, by switching the cam surfaces on which the cam followers 35 and 36 contact, different drive control is performed for single-sided printing and double-sided printing. In the cam member 33 for the child claw 26, the one-sided printing cam surface 33a is located outside the two-sided printing cam surface 33b in the axial direction, whereas the cam member 34 for the parent claw 25 is used.
In contrast, on the contrary, the single-sided printing cam surface 34a is located axially inward of the double-sided printing cam surface 34b.

More specifically, when the cam member 33 for the child claw 26 is viewed from the inside in the axial direction of the reversing cylinder 10, FIG.
It becomes like (a). The cam follower 35 travels in the direction of arrow P on the cam surface as the reversing cylinder 10 rotates. In the case of single-sided printing, the cam surface 3 at the transfer position B to the impression cylinder 7
3a has a height close to the maximum height, and the child claw 26 takes a delivery posture. After that, as the height of the cam surface 33a becomes lower, the child claw 26 once turns to the front side in the rotation direction of the reversing cylinder 10, that is, in the direction in which the claw opens, by the spring force of the torsion bar. Thereafter, as the height of the cam surface 33a gradually increases toward the receiving position A1 from the storage cylinder 9, the child claw 26 turns in the direction in which the claw closes, and at the receiving position A1, the cam surface 33a is close to the maximum height. At a height, the claw 26 takes a receiving posture. Between the receiving position A1 and the delivery position B, the cam surface 33a has the maximum height, and the claw 26 maintains the state in which the sheet is strongly gripped. On the other hand, in the case of double-sided printing, from the delivery position B to the point C
Up to the same position as in single-sided printing, but from point C, the height becomes even lower than that of the cam surface 33a for single-sided printing, and becomes the minimum height at the receiving position A2. The height of the cam surface 33b gradually increases, reaches the maximum height at a point C on the way, and then the maximum height is maintained up to the transfer position B. The difference in the receiving position between the double-sided printing and the single-sided printing is that the position of the drive shaft 24 is used as a reference.

On the other hand, when the cam member 34 for the parent claw 25 is viewed from the inside in the axial direction of the reversing cylinder 10, it becomes as shown in FIG. The cam follower 36 travels in the arrow P direction on the cam surface as the reversing cylinder 10 rotates. In the case of single-sided printing, the cam surface 34a extends from the receiving position A1 to the delivery position B.
Is at the minimum height, and the cam follower 36 has its cam surface 34
It is in a state of floating from a. This is because the parent claw 25 comes into contact with the stopper 60 when the cam surface becomes lower than a predetermined value. After passing the delivery position B, the cam surface 34a reaches the maximum height at the point C. Before the point C, the parent claw 25 swivels away from the stopper 60, and thereafter swivels in a direction approaching the stopper 60. On the other hand, for double-sided printing, after the point C, the cam surface 34
After b becomes high and reaches the maximum height at the receiving position A2, the height of the cam surface 34b gradually decreases and becomes the minimum height at a predetermined position (point C) to reach the delivery position B.

The switching of the cam surfaces is performed when the cam surfaces for double-sided printing and the cam surface for single-sided printing are at the same height. Specifically, since there is a pair of cam followers facing each other by 180 degrees for one cam member, the operation is performed at the point C. However,
It may be point D.

The cam member 33 for the child claw 26 is further provided with an adjusting cam surface 33c on the outer side in the axial direction of the one-sided printing cam surface 33a. The adjustment cam surface 33c is for pseudo-reproducing the attitude of the reversing gripper 13 when receiving the sheet during single-sided printing at a position different from the receiving position A1 during single-sided printing. The adjustment cam surface 33c is provided with a pseudo paper delivery section G having the same height as the receiving position A1 of the single-sided printing cam surface 33a. The pseudo paper delivery section G is provided between the delivery position B and the delivery position A1 for single-sided printing. The pseudo paper delivery unit G may be a point, but preferably has a predetermined angle area.

It should be noted that the cam member 34 for the parent claw 25 is not provided with an adjusting cam surface. The reversing body 10 is provided with the main nail 2
5 is provided with a stopper 60 that supports it from the inside in the radial direction, and at the receiving position A1 during single-sided printing, the parent claw 25 is in a position in contact with the stopper 60. Therefore, the attitude of the parent pawl 25 at the receiving position A1 is determined by the stopper 60 regardless of the shape of the cam surface 34a. Therefore, when adjusting the gap, the cam follower 36 on the parent claw 25 side may be removed from the cam member 34 to be in a free state, so that the cam member 34 for the parent claw 25 is not provided with an adjusting cam surface. .

The switching from the one-sided printing cam surface 33a to the adjustment cam surface 33c is performed by moving the cam follower 35 itself in the axial direction by a method described later. First, at the point E on the one-sided printing cam surface 34a, the cam follower 36 on the parent claw 25 side is moved inward in the axial direction to be in a free state. Then, the cam follower 35 on the child claw 26 side is moved outward in the axial direction at the point E of the one-sided printing cam surface 33a, and moved from the one-sided printing cam surface 33a to the adjustment cam surface 33c side. In addition, the parent claw 25 side, the child claw 2
On both sides of the six sides, the cam followers 35 and 36 are in a floating state without abutting on the single-sided printing cam surfaces 33a and 34a at the point E, so that the cam followers 35 and 36 can be moved easily. Both claws 25 and 26 are structured so that they cannot be opened beyond a predetermined angle, and at point E,
While the main claw 25 is in contact with the stopper 60,
Since the height of the one-sided printing cam surface 33a on the side of the child claw 26 is further lower than the height corresponding to the maximum opening angle,
At the point E, the cam follower 35 for the claw 26 is in a floating state.

Next, when adjusting the gap, the cam follower 3
A method for moving 5, 36 in the axial direction will be described. As shown in FIGS. 5 and 6, on the outer peripheral surface of the reversing cylinder 10,
A separation movable unit 50 is provided which is separated from the other region of the outer peripheral surface. A bracket 51 is fixed to the inside of the separable movable portion 50, and a pair of bearing portions 52 are provided on the bracket 51.
1 is rotatably supported. Although FIG. 5 shows the child claw 26 side, the parent claw 25 side is also provided with the separation movable portion 50 as shown in FIG. That is, a total of four separate movable portions 50 are provided on the outer peripheral surface of the reversing cylinder 10.
The detachable movable part 50 is usually attached to the reversing cylinder 10 by bolts 53.
It is fixed to the inner wall 54 and rotates integrally with the other region of the outer peripheral surface.

Further, between the inner side wall 54 of the reversing cylinder 10 and the separable movable portion 50, the rotary shaft 5 is attached to the inner side wall 54 of the reversing cylinder 10.
A disk-shaped rotating body 56, into which 5 is inserted and which is rotatably supported on the inner wall 54, is provided. The rotary shaft 55 is located at the center of the rotary body 56, while a hexagonal bolt 57 is screwed onto the outer surface of the rotary body 56 at a position eccentric from the rotary shaft 55 so that its head projects. A long hole 58 that is long in the circumferential direction is formed through the separable movable portion 50, and the head of the hexagon bolt 57 is engaged with the long hole 58. Then, with the bolt 53 loosened, set the tool to the hexagon bolt 57
The hexagon head bolt 5
7, the rotating body 56 rotates about 180 degrees around the rotating shaft 55, and the separation movable unit 50 moves from the state of FIG. 6A to the state of FIG. 6B in the axial direction of the reversing cylinder 10. Move to. As described above, the lever shaft 41 is provided inside the separable movable portion 50 via the bearing portion 52. Therefore, the separable movable portion 50, the bearing portion 52, the lever shaft 41, the cam lever 42, and the cam follower 36 are provided. The cam follower 36 on the parent claw 25 side moves as shown in FIG.
As shown in (b), the cam member 34 is separated inward in the axial direction. After the movement, the bolt 53 is tightened to fix the separation movable unit 50 at that position. The same applies to the child claw 26 side, and the cam follower 36 on the parent claw 25 side is separated from the movable section 50.
After being moved together, the cam follower 35 on the side of the child claw 26 is moved from the state shown in FIG.
It is moved outward in the axial direction to the state shown in (b) so as to face the adjustment cam surface 33c.

In the gripper driving device constructed as described above, since the adjusting cam surface 33c having the pseudo paper delivery portion G is separately provided, the double-sided printing cam surface 33b.
It is not necessary to form the pseudo paper delivery portion G on the single-sided printing cam surface 33a, and the degree of freedom in designing the two-sided printing cam surfaces 33a and 33b is increased. In particular, since the reversing gripper 13 has a large movement as in the present embodiment and the reversing cylinder 10 is a double cylinder, the effect of providing the adjusting cam surface 33c separately is great.

Further, as shown in FIG. 8B, since the pseudo paper delivery portion G is located above the reversing cylinder 10, the workability of gap adjustment becomes good.

Further, when the cam followers 35 and 36 are moved, the lever shaft 41 and the bearing portion 52 thereof are integrally moved, so that the cam followers 35 and 36 are moved.
It is possible to prevent a change in the operation of the reversing gripper 13 caused by moving the. Although it is possible to move only the lever shaft 41 without moving the bearing portion 52, it is possible to move the lever shaft 41 by the bearing portion 52 in the axial direction because the supporting position of the lever shaft 41 by the bearing portion 52 changes in the axial direction. Since the support state of the shaft 41 may change and the operation of the reversing gripper 13 may also change, the lever shaft 41
It is preferable to move the bearing portion 52 and the bearing portion 52 integrally.

Further, since the separation movable portion 50 is also constructed so as to be moved integrally, workability is good. That is, the bearing 5
Since 2 is located inside the outer peripheral surface of the reversing cylinder 10, it is generally not easy to move the bearing portion 52 together with the lever shaft 41 from the outside, but the separation movable portion 50 is provided and the separation movable portion 50 is provided. The workability is improved by integrally moving the bearing with the bearing portion 52.

Although the structure in which the cam followers 35 and 36 are manually moved has been described, the structure may be such that the cam followers 35 and 36 are automatically moved by the driving means. In addition, the cam member 33,
The 34 side may be moved.

Of course, the present invention is also applicable to a gripper driving device for driving and controlling a normal one-claw type gripper 11.
However, since the double-jaw type reversing gripper 13 has a larger movement than the single-jaw type gripper 11, the gripper driving device for the reversing gripper 13 is more effective. Further, although it can be applied to a single cylinder, it is highly effective for a double cylinder as described above and a triple cylinder or more.

[0047]

As described above, since the adjusting cam surface is provided separately from the printing cam surface, the design of the printing cam surface is facilitated and the sheet delivery timing is adjusted. Therefore, the work of adjusting the gap of the gripper is facilitated.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a double-sided printing machine.

FIG. 2 is a schematic plan view showing a reversing cylinder of the printing machine.

FIG. 3 is a schematic view of the reversing cylinder seen from the axial direction.

FIG. 4A shows a cam member on the child claw side, and FIG. 4B shows a cam member on the parent claw side.

5A and 5B are cross-sectional views of a main part of the reversing cylinder, in which (A) shows a single-sided printing and (B) shows a gap adjustment.

FIG. 6 is a plan view of a main part of the reversing cylinder, in which (a) shows a single-sided printing, and (b) shows a gap adjustment.

FIG. 7 is a sectional view showing an inversion gripper.

8A and 8B show the operation of the reversing gripper, in which FIG. 8A shows double-sided printing, and FIG. 8B shows single-sided printing.

FIG. 9 is a schematic view showing a conventional gripper driving device.

[Explanation of symbols]

10 ... Inversion cylinder, 11 ... Gripper, 13 ... Inversion gripper (gripper), 33, 34 ... Cam members, 33a, 34a
... double-sided printing cam surface, 33b, 34b ... single-sided printing cam surface, 33c ... adjusting cam surface, 35, 36 ... cam follower, 41 ... lever shaft (support shaft), 42 ... cam lever, 50
... Separable movable part, 51 ... Bracket, 52 ... Bearing part

Claims (3)

[Claims] 1. A printing cam surface for controlling the operation of a gripper for gripping a sheet at the time of printing, and a cam follower that travels on the cam surface as the cylinder rotates, and the gripper is moved by the movement of the cam follower. A gripper drive device configured to drive and control, wherein the adjustment cam surface is provided separately from the printing cam surface, and the attitude of the gripper at the time of transferring a sheet during printing is printed on the adjustment cam surface. A pseudo paper delivery unit is provided for pseudo reproduction at a position different from the delivery position at the time, and the cam surface with which the cam follower contacts can be switched between the printing cam surface and the adjustment cam surface. Gripper drive. 2. A support shaft rotatably supported by a bearing portion provided on the barrel, and a cam lever fixed to the support shaft. The cam lever is provided with a cam follower, and the support shaft is provided when the cam surface is switched. The gripper drive device according to claim 1, wherein the bearing part and the bearing part move integrally. 3. An outer peripheral surface of the body is provided with a separation movable portion which is separated from the other area of the outer peripheral surface, and a bearing portion is provided inside the separation movable portion so that the separation movable portion can be moved when the cam surface is switched. The gripper drive device according to claim 2, wherein the portion and the bearing portion move integrally.