JP2003266633A - Gripper driver of reversing cylinder for perfecting press and reversing cylinder of perfecting press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gripper driver which can accurately control to drive a reversing gripper and to provide the reversing cylinder having the same. <P>SOLUTION: A perfecting press comprises a pinion attached to a drive shaft which mounts the reversing gripper, a drive gear engaged with the pinion, and a cam follower running on a cam surface of a control cam and provided at a cam lever rotating at a supporting shaft different from that of the drive gear as a center. In this press, the reversing gripper is controlled to be driven by transmitting the operation of the lever to the drive gear via a transmission means. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripper driving device for a reversing cylinder in a double-sided printing machine and a reversing cylinder for a double-sided printing machine.

[0002]

2. Description of the Related Art Generally, a double-sided printing machine of this type is designed to transfer a sheet from an impression cylinder of an upstream printing unit to an impression cylinder of a downstream printing unit. Is equipped with. The paper delivery unit is
A sheet having a transfer cylinder (first transfer cylinder), a storage cylinder (second transfer cylinder), and a reversing cylinder in order from the upstream side, and one surface of which is printed by the impression cylinder on the upstream side is a transfer cylinder. After passing through the storage cylinder to the reversing cylinder, the front and back are reversed by the reversing cylinder, and the other surface is printed by the impression cylinder.

As such a reversing cylinder, for example, Japanese Patent Publication No.
The one described in Japanese Unexamined Patent Publication No. 6-2017 is known. As shown in FIG. 5, the reversing cylinder 10 includes a reversing gripper 13 that grips the front end portion or the rear end portion of the sheet. The reverse 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, at the time of double-sided printing, the reversing gripper 13 grips the rear end of the sheet sucked and held by the paper suction device 12 of the storage cylinder 9 at the counter contact A between the storage cylinder 9 and the reversing cylinder 10. . Then, as indicated by the radiation 82, the sheet is turned around the drive shaft 24 toward the rear side in the rotational direction of the reversing cylinder 10 in accordance with the rotation of the reversing cylinder 10 to turn the sheet upside down, and the reversing cylinder is rotated. The sheet is delivered to the downstream impression cylinder 7 at the counter contact B between 10 and the downstream impression cylinder 7. After that, the reversing gripper 13 pivots toward the front side in the rotation direction of the reversing cylinder 10 by approximately 180 degrees like the radiation 83 so that the tip end side thereof again faces the front side in the rotation direction of the reversing body 10 at the counter contact A.

The reversing cylinder 10 is provided with a gripper driving device for controlling the reversing gripper 13 in this manner. That is, the gripper driving device includes a segment gear 31 (driving gear) having a pinion 29 attached to an end of the driving shaft 24 and a tooth portion 31a meshing with the pinion 29.
It has and. The segment gear 31 includes the reversing cylinder 10
Is provided so as to be rotatable around a gear shaft 40 pivotally supported on the end face of the. A cam follower 35 is attached to the segment gear 31, and the cam follower 35 rotates the reversing cylinder 10 on the cam surface 33a of a control cam (not shown) fixed inside the frame (not shown). By traveling accordingly, the segment gear 31 swings around the gear shaft 40. In this way segment gear 3
The drive shaft 24 rotates by a predetermined angle due to the swinging of 1, and the reversing gripper 13 performs the opening / closing operation and the turning operation as described above.

[0006]

By the way, the reversing cylinder 10 shown in FIG. 5 is a so-called single cylinder having a drive shaft 24 on which the reversing gripper 13 is mounted at one location on the outer peripheral surface. On the other hand, it is conceivable to adopt a so-called double barrel structure in which the drive shafts 24 are provided at two positions on the outer peripheral surface, that is, at positions facing each other by approximately 180 degrees. In this case, the gripper drive device also drives the drive shaft 2 in order to drive and control the drive shafts 24 at two locations independently.
Although it is necessary for each four, it is impossible to dispose two segment gears 31 having a substantially O shape as shown in FIG.

Therefore, the present inventor manufactured a substantially C-shaped segment gear 31 as shown in FIG.
Since the distance from to the tooth portion 31a becomes long, the rigidity of the segment gear 31 is insufficient, and it is difficult to accurately drive and control the reversing gripper 13.

[0008] Such a problem is remarkable in the reversing cylinder 10 having a size larger than that of the double cylinder, but can occur in a single cylinder. That is, when the segment gear 31 cannot adopt a highly rigid shape such as a substantially O-shape due to space restrictions or the like, similarly, the gripper drive that can drive and control the reversing gripper 13 with high accuracy. Equipment is required.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a gripper driving device capable of driving and controlling a reversing gripper with high accuracy, and a reversing cylinder including the gripper driving device.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a gripper driving device for a reversing cylinder in a double-sided printing machine according to the present invention is a single sheet in the reversing cylinder of a double-sided printing machine. A gripper driving device for driving and controlling a reversing gripper that grips paper and reverses it, wherein a pinion attached to a drive shaft on which the reversing gripper is mounted, a drive gear that meshes with the pinion, and a cam of a control cam. A cam follower that travels on the surface, the cam follower is provided on a cam lever that rotates about a support shaft different from the support shaft of the drive gear, and the operation of the cam lever is transmitted to the drive gear via transmission means. It is characterized in that it is configured to drive and control the reversing gripper.

Further, the reversing cylinder of the double-sided printing machine according to the present invention is provided with a pair of drive shafts, each of which has a reversing gripper for gripping a sheet and reversing the inside and the other, facing each other by about 180 degrees. The gripper drive device according to claim 1 is provided for each drive shaft so as to independently control the drive.

[0012]

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.

FIG. 1 shows a double-sided printing machine having a reversing cylinder provided with a gripper device according to this embodiment. The double-sided printing machine comprises a paper feed unit 1, a paper discharge unit 3, and a printing unit 2, and the printing unit 2 has two printing units 4 and 5, and a paper delivery unit between the printing units 4 and 5. Is provided. The double-sided printing machine is capable of switching between single-sided printing and double-sided printing, and at the time of double-sided printing, one side is double-colored by the upstream printing unit 4 and then the front and back sides are reversed by the reversing cylinder 10. The printing unit 5 on the downstream side performs two-color printing on the other surface. During single-sided printing, one side is printed in four colors in both printing units 4 and 5. 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, a total of three grippers 11 and three paper suction devices 12 are arranged on the storage cylinder 9 at intervals of approximately 120 degrees, and on the transfer cylinder 8, a gripper 11 for gripping the front end of the sheet is approximately 180. Arranged opposite to each other,
Reversing grippers 13 that hold the front end of the sheet during single-sided printing and the rear end of the sheet during double-sided printing are arranged to face each other by approximately 180 degrees.

The operation of the reversing gripper 13 is the same as that described with reference to FIG. 5 during double-sided printing. The operation of the reversing gripper 13 during single-sided printing will be outlined. At the counter contact A in FIG. 5, the reversing gripper 13 grips the front end of the sheet and then rotates with the reversing cylinder 10 while maintaining that state, and the counter contact B At, the sheet is delivered to the impression cylinder 7 on the downstream side. After that, a predetermined turning operation is performed in front of the counter contact A in order to take a posture of gripping the front end portion of the sheet.
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 that drives and controls the reversing gripper 13 also performs different drive control between the double-sided printing and the single-sided printing. This point will be described later.

By the way, FIG. 2 shows the reversing cylinder 1 of this embodiment.
0 is shown. The reversing cylinder 10 is configured to rotate integrally with the rotating shaft 20, and the rotating shaft 20 is rotatably supported by the left and right frames 21 and 22 via bearings 23. The reversing cylinder 10 is provided with a pair of drive shafts 24 on which the reversing grippers 13 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. 3, the reversing gripper 13 is configured to grip a sheet by the 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 pawl tube 27 and the other end (right end in the drawing) of the pawl 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 surface (the left end surface in the drawing) of the reversing cylinder 1.
On the other end surface of 0 (the right end surface in the figure), a gripper drive device for driving and controlling the parent claw 25 is provided. Since the gripper driving device for the child claw 26 and the gripper driving device for the parent claw 25 have the same configuration, the gripper driving device for the child claw 26 will be described below. In FIG. 2, a control cam 33 for the child claw 26 and a control cam 34 for the parent claw 25 are fixed inside the left and right frames 21 and 22, respectively. These control cams 33 and 34 have cam surfaces 33a and 34a for single-sided printing and a cam surface 3 for double-sided printing on their outer peripheral surfaces.
3b, 34b, and when switching between double-sided printing and single-sided printing, both control cams 33, 34 are turned over by the reversing cylinder 10.
By moving the cam followers 35 and 36 in the axial direction, the cam surfaces with which the cam followers 35 and 36 come into contact are switched. By switching the cam surface with which the cam followers 35, 36 are in contact, different drive control is performed for single-sided printing and double-sided printing.

In FIG. 4, a gripper drive for the pawl 26 is shown. The reversing cylinder 10 is a double cylinder, and a pair of drive shafts 24 are provided to face each other by about 180 degrees. Therefore, in order to drive and control the reversing grippers 13 independently for each drive shaft 24, the reversing cylinders 10 The gripper driving device is also about 180
One pair are provided facing each other. The pair of claws 26
The gripper driving device for the vehicle is arranged in a position symmetrical with respect to the center of the reversing cylinder 10. Incidentally, a pair of parent nails 25
The reversing cylinder 10 is provided with a total of four gripper driving devices together with the gripper driving devices for use with the gripper driving device.

The segment gear 31 is formed in a fan shape of about 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 (support shaft) parallel to
Are rotatably supported on the end face 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, 36 are connected to the cam surfaces 33a, 33b, 34a of the control cams 33, 34. It is pressed against 34b.

In the gripper driving device constructed as described above, the cam follower 35 is separated from the segment gear 31, so that the segment gear 31 can be designed more freely and can be miniaturized. Therefore, it becomes easy to sufficiently secure the rigidity of the segment gear 31, and the reversing gripper 13 can be driven and controlled with high accuracy. Further, the separated cam follower 35 is provided with a lever shaft 41 arranged in parallel with the gear shaft 40 of the segment gear 31.
Is provided on the cam lever 42 that rotates about the fulcrum, and the movement of the cam follower 35 is transmitted to the segment gear 31 via the cam mechanism. Therefore, the entire gripper drive device can be made compact and its weight can be reduced. it can. Further, by adopting the cam mechanism as the transmission means, the transmission means can be simplified and downsized.
In addition to the cam mechanism, for example, a link mechanism or a gear train may be used as the transmission means.

Further, when the reversing cylinder 10 is a double cylinder as in this embodiment, it is necessary to dispose a pair of gripper driving devices on the end face thereof. The effect of making the gripper drive device compact is greater than that of the single cylinder. However, this gripper drive device can be applied to the reversing cylinder 10 having three or more drive shafts 24 with three or more drive shafts, or a single cylinder, and in any case, the segment gear 31 can have high rigidity. Highly accurate reverse gripper 1
3 drive control becomes possible.

Although the segment gear 31 partially having the tooth portion 31a is used as the drive gear, it may be a general spur gear or the like having the tooth portion on the entire circumference.

[0026]

As described above, by providing the cam follower on the cam lever that rotates about a support shaft different from the support shaft of the drive gear, the drive gear can be made compact and highly rigid, and the reversing gripper can be made high. The drive can be controlled with high precision. In particular, when the reversing cylinder is a double cylinder, the effect of making the drive gear compact and highly rigid is significant.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a double-sided printing machine according to an embodiment of the present invention.

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

FIG. 3 is a sectional view of a main part of the reversing cylinder.

FIG. 4 is a schematic view of the reversing cylinder seen from the axial direction.

FIG. 5 is a schematic view showing a conventional reversing cylinder.

FIG. 6 is a schematic view showing a conventional reversing cylinder.

[Explanation of symbols]

10 ... Inversion cylinder, 13 ... Inversion gripper, 24 ... Drive shaft, 2
7 ... Claw tube (driving shaft), 28 ... Claw shaft (driving shaft), 29, 3
0 ... Pinion, 31, 32 ... Segment gear (driving gear), 33, 34 ... Control cam, 33a, 33b, 34
a, 34b ... cam surface, 35, 36 ... cam follower, 40
... Gear shaft (support shaft), 41 ... Lever shaft (support shaft), 42 ... Cam lever

Claims (2)

[Claims] 1. A gripper driving device for driving and controlling a reversing gripper (13) for gripping a sheet and reversing the front and back in a reversing cylinder (10) of a double-sided printing machine, wherein the reversing gripper (13) is mounted. A pinion (29) attached to the drive shaft (24), and the pinion (29)
And a cam follower (35) that travels on the cam surface (33a) of the control cam (33). The cam follower (35) serves as a support shaft (40) of the drive gear (31). Are provided on cam levers (42) that rotate about different spindles (41), and the cam levers (42)
The gripper driving device for the reversing cylinder in the double-sided printing press, wherein the reversing gripper (13) is configured to be driven and controlled by transmitting the above operation to the driving gear (31) through the transmitting means. 2. A pair of drive shafts (24), each having a reversing gripper (13) for gripping a sheet and reversing the inside and the other side thereof, are installed so as to face each other by approximately 180 degrees.
4. The reversing cylinder of a double-sided printing machine, wherein the gripper driving device according to claim 1 is provided for each drive shaft (24) so as to independently drive and control each 4).