JPH03190737A - Plate twisting apparatus of plate cylinder for printing press - Google Patents

Abstract

PURPOSE:To apply no strain to a form bed by making either one of a biting vise or a biting end vise shakable around the pin fixed to a plate cylinder and making the other vise movable along the slide surface formed by the circular arc around the pin at the time of the development of the form bed. CONSTITUTION:The upper and lower biting vises 4b, 4a claming the biting edge part of a form bed 12 and the upper and lower biting end vises 13b, 13a clamping the biting end edge part of the form bed 12 are provided in opposed relation to the groove 6a provided to a plate cylinder 6 in its axial direction by drilling. At this time, either one of the biting vises or the biting end vises is made shakable around the pin fixed to the plate cylinder 6 by the push and pull rod operated from the outside of the plate cylinder 6. Further, the other one of them is made movable along the slide surfaces 16, 17 formed by the circular arc around the pin at the time of the development of the form bed in connection with the shaking vises.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plate twisting device for a plate cylinder of a sheet-fed printing press or the like.

[Conventional technology and its issues]

-i) If the printing plate attached to the plate cylinder in a sheet-fed printing press is tilted with respect to the paper being transported, it is not possible to accurately print on the paper. For this reason, printing presses are equipped with a plate twisting device, which corrects the tilted plate surface.

Conventionally, regarding this type of plate twisting device, many proposals have been made for plate twisting devices that can be adjusted even during printing press operation, one of which is as follows. That is, Japanese Patent Application Laid-Open No. 1-108046 discloses that the edges of the printing plate are connected by a pair of links (cuspical side vise and cuspal side vise). Clamp and connect these links with other opposing short side links at both ends in the direction of the plate cylinder axis to form a parallelogram link, and one short side link of this parallelogram link. is reciprocated in an arc around a pin fixed to the plate cylinder using an air cylinder built into the cylinder, and the other short side link is moved around another pin fitted into that link. A device is shown in which the printing plate is twisted so that the bite side and the buttside side of the printing plate are shifted from each other even during operation of the printing press by swinging the plate.

However, in such a plate twisting device, since the opposing short-side links move differently, the twisting operation at both ends of the plate cylinder becomes uneven, which may cause distortion to the plate, and also Since it only supported both edges, there was a problem in that when the printing plate and printing cylinder were fixed, the middle part of the printing plate was bent.

[Failure to solve the problem]

Therefore, in the present invention, upper and lower bite-side vises that clamp the bite-side edges of the printing plate, and upper and lower bite-side vises that clamp the bite-side edges of the printing plate, are connected to the plate cylinder. In a printing press cylinder provided facing a groove bored in the axial direction, either the bite-side vise or the butt-side vise is controlled by a push-pull rod operated from outside the plate cylinder. It is movable around a fixed bottle, and the other side is moved in conjunction with the swinging vise and along a sliding surface formed by an arc centered on the bottle when the printing plate is unfolded. The present invention provides a plate twisting device for a plate cylinder for a printing press, which is characterized by the following:

〔Example〕

The present invention will be described in detail with reference to an embodiment in which the present invention is applied to a sheet-fed printing press shown in the accompanying drawings.

Fig. 1 is an overall side view of the embodiment of the present invention, Fig. 2 is a cross-sectional view from ■ to Fig. 1, Fig. 3 is a cross-sectional view of the occlusal side from x to Fig. 1, and Fig. 4 is a cross-sectional view from Figure 5 is a cross-sectional view of the buttock side at ■~ in Figure 1, Figure 6 is a cross-sectional view from ■~ in Figure 1, Figure 7 is a developed view for explaining the operation, Figure 8 1 is a cross-sectional view of the first embodiment, FIG. 9 is a cross-sectional view of FIG. 8, and FIGS. 10 and 11 are views of other embodiments.

In these figures, reference numeral 1 denotes a bite-side vise seat attached to a groove 6a formed in the axial direction of the plate cylinder 6.

Also, in the groove 6a, a vise pressure side pin 2a and a plate cylinder side pin 2b are provided.
A vise pressure side pin 2a of the lever 2 with an eccentric pin consisting of
is installed rotatably. The plate cylinder side pin 2b of the lever 2 with an eccentric pin provided in the groove 6a is fitted into this bite-side vise seat 1.

The pins 2a and 2b of this lever 2 with an eccentric pin are eccentric with respect to each other, and a horizontal lever 20 is provided extending from the connecting portion of these pins 2a and 2b.

This vise pressure side pin 2a is fitted into a hook-shaped slide piece 3, and this slide piece 3 is fitted into a slide groove 1a bored in the bite side vise seat 1 so as to be movable in the axial direction of the plate cylinder. are doing. A notch 1b is bored in the lower surface of the slide groove 1a so that the lever 2C can swing.

The occlusal vise seat 1 is rotatably supported around a bottle 5 fixed to the axial center of the plate cylinder 6, and a lower occlusal vise seat 1 is provided on the upper surface of the occlusal vise seat 1. A force 4a is placed. These occlusal vise 1 and lower occlusal vise 4a are regulated by a support rail 9 fixed to the upper surface of the occlusal vise 1 so that they can move in the circumferential direction and axial direction of the plate cylinder. There is. Further, the bite-side vise seat 1 and the lower bite-side vise 4a are fixed in the circumferential direction of the plate cylinder by an adjustment bolt 7, and fixed in the axial direction of the plate cylinder by another adjustment bolt 8.

A guide bar 4C and a lower bite side vise 4b are fixed to the upper side of the lower bite side vise 4a by fixing bolts (not shown). Then, the edge of the printing plate 12 is clamped between the lower bite side vise 4b and the lower bite side vise 4a, and the lower bite side vise 4b is moved on the support rail 9 in the circumferential direction of the plate cylinder using the adjustment bolt 7. move it,
This printing plate 12 is made to be tense.

The bite-side vise seat 1 and the plate cylinder 6 are regulated by support rails 9a fixed to the plate cylinder 6, so that they can only move in the circumferential direction and axial direction of the plate cylinder.

On the other hand, reference numeral 14 denotes a cusp-side vise seat, which is attached to the groove 6a of the plate cylinder 6 opposite to the cusp-side vise seat 1. This butt side vise seat 14 is regulated by a support rail 15a fixed to the plate cylinder 6 so as to be able to move in the circumferential direction and axial direction of the plate cylinder. A lever 20 with an eccentric pin is rotatably protruded from the center of the groove 6a in the axial direction of the plate cylinder.
These bins 20a and 20b are eccentric to each other, and a horizontal lever 20c extends from the connecting portion of these bins 20a and 20b. This plate cylinder side pin 20a is fitted into a hook-shaped slide piece 21, and this slide bead 21 is fitted into a slide groove 14a bored in the butt side vise pressure 14 so as to be movable in the plate cylinder circumferential direction. It matches. A notch 14b through which the lever 20C can swing is bored in the lower surface of the slide groove 14a.

A plurality of sliding surfaces 16 are formed in the vise pressure on the cuspal side side 14 and are arranged in parallel on the side of the vise seat on the counter-biting side. The formed slides 18 are in contact with each other. In addition, these sliding surfaces 16°18 are all in the shape of concentric circular arcs as shown in Fig. 7, and the center O of the radius R is
is on a line that is perpendicular to the axis of the plate cylinder and passes through the bin 5, so its radius R is the shortest distance from the center O of the pin 5 on the surface of the plate cylinder when the plate 12 is unfolded.

Also, on the upper surface of the buttock side vise pressure 14, there is a lower buttock side vise 13a.
is placed, and the buttock side vise pressure 14 and the lower buttock side vise pressure 13a are the support rail 1 fixed to the upper surface of the buttock side vice pressure 14.
5 to allow movement in the circumferential direction and axial direction of the plate cylinder.

The butt end side vise pressure 14 is fixed to the lower butt end side vise 13a by an adjustment bolt 23 in the circumferential direction of the plate cylinder, and is fixed by another adjustment bolt 24 in the axial direction of the plate cylinder.

A guide bar 13c and a lower occlusal vise 13b are fixed to the upper side of the lower occlusal vise 13a by fixing bolts (not shown). The lower bite side vise 13b is the lower bite side vise 1.
3a, and move the lower buttock side vise 13b to the lower buttock side vise seat 14 using the adjustment bolt 23 on the support rail 15a in the circumferential direction of the plate cylinder. , this printing plate 12 is made to be tense.

By the way, the eccentric bottle levers 2 and 20 are connected by a connecting lever 25, 26.

That is, the connecting lever 25 is rotatably pin-coupled to the eccentric pin-equipped lever 2, and also slidably passes through the spring support bracket 11a fixed in the groove 6a. In addition, the other connecting lever 26 is the lever 2 with an eccentric bottle.
0, and slidably passes through another spring support bracket 11b fixed in the groove 6a. These connecting levers 25 and 26 are pin-coupled to each other via a movable bracket 27.

Therefore, if one lever with eccentric bottle 2 is swung,
Connection lever 25 → movable bracket 27 → connection lever 26
As a result, the other lever 0 with an eccentric bottle is swung, and as a result, the butt end side vise pressure 14 is moved along the slide rail 17's underside 18.

In addition to the spring support bracket 118.11b through which the connecting lever 25.26 is slidably inserted, other spring support brackets (118.11b) (118.11b, 118.11b, 118.11b, 118.11b, and 118.11b), through which the connecting lever 25.26 is slidably passed, are fixed to other spring support brackets (118.11b, 118.11b),
For these spring support brackets 11, lower bite side vise 4
A spring 10 is interposed between it and the lower cusp side vise 13c, and a spring 19 is interposed between it and the lower cusp side vise 13c. These springs 10 and 19 press the occlusal vise 1 and the cuspal vise pressure 14, respectively. In particular, the spring 19 presses the cusp side vise pressure 14 against the slide tray 17.

Next, referring to the means for operating the lever 2 with an eccentric bottle, a first embodiment is shown in FIGS. 8 and 9.
A second embodiment is shown in FIG. 10, and a third embodiment is shown in FIG. 11. First, in FIGS. It is guided by a presser metal fitting that does not cover the plate, and is movable in the axial direction of the plate cylinder. One end of a connecting rod 29 is connected to the upper surface of the movable bracket 27 by a pin 28. One end of a bell crank 30 is connected to the other end of the connecting rod 29 by a pin 31, and the bell crank 30 is rotatably supported by a bracket 33 fixed to the plate cylinder 6 by a pin 32. This bell crank 3
A bracket 34 is suspended from the other end of 0 by a pin 35, and a pair of roller followers 36 are attached to this bracket 34.
is suspended. These roller followers 36 sandwich a disc rail 38 of a gear 37 with a disc rail.

This gear with disc rail 37 has a bearing housing 39
It is supported by a feed screw portion 41, and its gear portion 42 meshes with a gear shaft 40.

This gear shaft 40 is supported by a bearing 43 fixed to a drive side frame 44.

Note that the plate cylinder 6 is supported by the driving side frame 44 through a bearing 45.

Next, to describe the operation of this embodiment, during operation of the sheet-fed printing press, the printing plate 12 is applied to the transferred printing paper (not shown).
If the gear shaft 40 is rotated by an appropriate remote or automatic driving device (not shown), the gear 37 with a disc rail will try to rotate; Since it meshes with the feed screw portion 41 carved in the housing 39, the gear 37 with the disk rail
is screwed forward and backward relative to the hair ring housing 39 in the axial direction of the plate cylinder. As a result, the roller followers 36 holding the disc rail portion 38 are moved in the same direction.
Bracket 34 on which the roller follower 36 is suspended
move in the same direction, and that movement causes the bell crank 30 to swing through the bin 35.

The gear portion 42 moves in the same direction as the disk rail gear 37 and the bearing housing 39 move in the direction of the plate cylinder axis, but since it slides on the tooth surface, there is no problem in meshing with the gear shaft 40. In addition, the bearing housing 39
is fixed to the plate cylinder 6 in the axial direction by a bearing 45, so when the plate cylinder 6 is adjusted in the axial direction by a plate cylinder left-right adjustment device (not shown), the plate cylinder 6 and the hair ring housing 39 are integrally connected. Since it moves in the axial direction of the plate cylinder, the disc rail gear 37 also accompanies it. Therefore, the axial adjustment of the plate cylinder 6 has no effect on the plate twisting device of this embodiment.

The swinging of the bell crank 30 pushes and pulls the connecting rod 29, pushing and pulling the movable bracket 27 with respect to the plate cylinder 6, and the connecting levers 25 and 26 move in the axial direction of the plate cylinder by the same amount of movement. do. Therefore, the eccentric bottle levers 2 and 20 swing slightly in opposite directions. The swung lever 2 with an eccentric bottle tries to rotate the slide piece 3 by the amount of eccentricity, but since the pin 5 on the bite side vise seat 1 cannot move in the axial direction of the plate cylinder,
The occlusal vise seat 1 is rotated around the bottle 5.

Therefore, the occlusal side position of the printing plate 12 can be corrected by applying a twist to the integrated lower occlusal side vise 4b using the adjusting bolt 7.8. At this time, the distance between the center of the bin 5 and the center of the vise pressure side bin 2b of the lever with eccentric pin changes, but this is due to the slide groove 1a of the slide piece 3.
This is absorbed by the movement in the axial direction of the plate cylinder, and the bite-side vise seat 1 and the lever with eccentric bottle 2 can move smoothly.

On the other hand, as the lever 20 with the eccentric pin swings, the slide piece 21 is rotated by the amount of eccentricity, so the butt-side vise seat 14 tries to rotate, but this rotation is caused by the sliding surface of the slide rail 17. 18 and resists the elasticity of the spring 19, it moves in an arc, that is, rotates around the bottle 5 as the center 0. Therefore, it is possible to correct the position of the printing plate 12 on the buttock side by applying the same twist as the lower bite side vise 4b to the lower bite side vise 13b, which is integrated with the adjustment bolts 23 and 24. can.

Next, the second embodiment shown in FIG. 10 will be described. The movable bracket 27 is slidably guided from its upper surface in the axial direction of the plate cylinder by a presser metal fitting 46. One end of a connecting rod 29 is fixed to the movable bracket 27, and the other end of the connecting rod 29 is fixed to the side surface of a donut-shaped disk 47. Further, this connecting rod 29 is supported by a bush 48 fixed to the plate cylinder 6 so as to be slidable in the axial direction.

A plurality of support rods 49 are fixed to the side surfaces of the disc 47, and the support rods 49 are supported by a bush 50 fixed to the plate cylinder 6 so as to be slidable in the axial direction.

Therefore, the donut-shaped disk 47 is supported by the plate cylinder 6 by the connecting rod 29 and a plurality of support rods 49, and the plate cylinder 6 is
It is designed to rotate with the Also, this disk 47
is sandwiched between a plurality of opposing rollers 51, 51, and these rollers 51, 51 are rotatably embedded in a gear with rollers 52. Therefore, as in the first embodiment shown in FIG. 8 described above, when the gear shaft 40 is rotated, the roller gear 52 is screwed forward and backward by the feed line screw 41, and the connecting rod 29 is pushed and pulled. Ru.

Note that since the rotational movement of the plate cylinder 6 involves the rollers 51, it does not affect the gear with rollers 47.

Next, referring to the embodiment shown in FIG. 11, a bottom groove 6b is further bored in the groove 6a of the plate cylinder 6.
A rotating shaft 53 is installed horizontally at b.

One end of this rotating shaft 53 is rotatably supported by a support 54, and the other end is rotatably supported by an ultra-small septa 55.

A feed screw portion 56 is carved in the intermediate portion of the rotary shaft 53, and the feed screw portion 56 is screwed into a screw hole of the movable bracket 27 to pass through it. Therefore, the rotating shaft 5 is operated by the motor 55 connected to the rotary connector (not shown).
3 rotates, the plate cylinder is moved back and forth in the axial direction via the movable bracket 27 by the non-feed portion 56.

Although the embodiments shown in FIGS. 1 to 7 are configured so that the occlusal side vise is swung around the pin, the present invention is not limited to this, and the occlusal side vise is It may also be made to swing around the pin.

[Effects of the Invention] According to the present invention, either the occlusal vise or the cuspal vise is made swingable around the pin fixed to the plate cylinder,
The other vise was made movable along the sliding surface formed by an arc centered on this bottle when the plate was unfolded, so that the parallelogram on the plate was not deformed.
Therefore, there is almost no distortion in the printing plate.

[Brief explanation of drawings]

Fig. 1 is an overall side view of the embodiment of the present invention, Fig. 2 is a cross-sectional view from ■ to Fig. 1, Fig. 3 is a cross-sectional view of the occlusal side from x to Fig. 1, and Fig. 4 is a cross-sectional view from Figure 5 is a cross-sectional view of the buttock side at ■~ in Figure 1, Figure 6 is a cross-sectional view from ■~ in Figure 1, Figure 7 is a developed view for explaining the operation, Figure 8 1 is a sectional view of the first embodiment, FIG. 9 is a sectional view of FIG. 8, and FIGS. 10 and 11 are views of other embodiments. 4b, 4a...Upper and lower bite side vise, 5...Bin, 6...
... Plate cylinder, 6a... Groove, 12... Plate plate, 13b, 1
3a... Upper and lower buttock side vices, 16.17... Sliding surface, 29... Connecting rod, 53... Rotating shaft. Sub-Agent Patent Attorney Yoshihiko Okabe Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] (1) Upper and lower bite-side vises that clamp the bite-side edges of the printing plate, and upper and lower bite-side vises that clamp the bite-side edges of the printing plate, in the axial direction of the plate cylinder. In a printing plate cylinder for a printing press, which is provided opposite to the perforated groove, either the bite-side vise or the butt-side vise is controlled by a pin fixed to the plate cylinder by a push-pull rod operated from outside the plate cylinder. and the other is movable along a sliding surface formed by an arc centered on the pin when the printing plate is unfolded, in conjunction with the swinging vise. A plate twisting device for a plate cylinder for a printing press, characterized by: