JP2591668B2 - Adjustment device for gap between cylinders of double-sided printing sheet-fed printing press - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder-to-cylinder gap adjusting device that adjusts the gap between cylinders according to the thickness of printing paper in a double-sided printing sheet-fed printing press.

[Conventional technology]

As a type of sheet-fed printing press, various double-sided printing presses have been developed that enable one machine to print on the front and back sides of paper. Of these, front printing is multicolor printing and back printing is available. For one-color printed materials, those having a structure in which a back-printing unit is provided between a sheet feeding device and a first-color front printing unit have been developed.

A back-printing unit in this type of printing press includes a back-printing cylinder on which a plate is mounted, a back-printing rubber cylinder in contact with the back-printing cylinder and transferring an image formed on the plate surface, and a back-printing rubber. A back-pressing cylinder is provided to contact the cylinder with a gap therebetween and to apply printing pressure during printing, and the back-press cylinder is in contact with the front-press cylinder of the first-color front-surface printing unit with a gap.

With this configuration, the image on the backing blanket cylinder is transferred to the paper conveyed in addition to the claws of the backing printing cylinder from the sheet feeding device via the swing device and the transfer cylinder. This paper is back-printed, and the paper is transferred from the back-press impression cylinder pawls to the front-press impression cylinder pawls. The printing of the second and subsequent colors is performed while being conveyed after being replaced by the claws with the torso.

[Problems to be solved by the invention]

However, in such a conventional double-sided printing sheet-fed printing press, the gap between the back printing impression cylinder and the front printing impression cylinder is set to be larger than the thickness of the thickest paper in view of a margin. In the case of (1), there is a problem in that the printing register at the time of replacement is out of order and the quality of the printed matter is deteriorated, or the backlash of the gear between the two impression cylinders is increased to cause noise or printing trouble.

[Means for solving the problem]

In order to solve such a problem, in the present invention, a back-printing printing cylinder, and a back-printing pressure cylinder that is in contact with the back-printing printing cylinder and the front printing pressure cylinder with a gap therebetween are provided on the inner circumference of the bearing. The shaft center of the circle and the shaft center of the supporting outer circle are eccentrically supported by an eccentric bearing, and the outer peripheral portions of the two eccentric bearings are connected by a connecting member, and one of the eccentric bearings is connected by a rotating operation member.

[Action]

When the paper thickness is changed, when the eccentric bearing of the printing cylinder for back printing is rotated by the rotation operating member, the printing cylinder for back printing is slightly moved by the eccentric action, and the gap between this and the printing cylinder for back printing is adjusted. At the same time, the eccentric bearing of the back printing cylinder connected by the connecting member rotates and the back printing cylinder slightly moves due to the eccentric action, and the gap between this and the front printing cylinder is adjusted. The gap corresponds to the thickness of the paper, so that the gripping of the paper is not defective. Also,
Even in the case of thick paper, the gap does not become unnecessarily large, so that gear back crash does not become a problem.

〔Example〕

1 and 2 show an embodiment of an apparatus for adjusting a clearance between cylinders according to the present invention. FIG. 1 is a schematic front view of the apparatus, and FIG. It is an outline front view of a machine. In the figure, a printing press 1 includes a paper feeding device 2, a back printing unit 3, front printing units 4, 5, and a paper discharging device 6, and the paper feeding device 2 has paper 7 loaded thereon. Stack 8
And a sucker device (not shown). Between the paper feeding device 2 and the back-printing unit 3, 1
A feeder board 9 for sliding the paper 7 sucked sheet by sheet is supported at an angle, and a swinging device 11 for carrying the paper 7 in addition is provided above a front end of a supporting plate 10 supported next to the front end thereof. Is provided.

Between the left and right frames of the back-printing unit 3, a back-printing plate 12 is mounted on the peripheral surface, and a back-printing plate cylinder 12 rotating in a direction indicated by an arrow in the drawing is supported by a shaft. A pair of left and right eccentric bearings 13 is provided diagonally above. In the eccentric bearing 13, the axis Y of the support outer circle 13a and the axis O of the bearing inner circle 13b are eccentric by the symbol t in the drawing, and the support outer circle 13a is fitted into the bearing hole of the frame. Supported together. A back-printing rubber cylinder 14 as a back-printing printing cylinder that rotates in the direction indicated by the arrow in the figure around a bracket around the inner circumferential circle 13b of the eccentric bearing 13 has a It is supported in contact with 12. Further, a pair of left and right eccentric bearings 15 are provided on the sides of the back printing blanket cylinder 14, and the eccentric bearings 15 are composed of a shaft center X of a support outer circumference circle 15a and a bearing inner circumference circle 1a.
The axis P of 5b only shown at t ₁ in FIG. Are eccentric,
The supporting outer circumference circle 15a is supported by fitting it into a bearing hole of the frame. And, in the bearing inner circumference circle 15b of the eccentric bearing 15,
A back printing pressure cylinder 16 having a diameter twice as large as that of the back printing plate cylinder 12 and rotating in a direction indicated by an arrow in the figure is supported by a circumferential surface thereof in contact with a back printing rubber 14. An eccentric bearing is provided between the back printing blanket cylinder 14 and the back printing pressure cylinder 16.
A clearance T that is adjusted by a clearance adjusting device (described later) including 13 and 15 is provided.
An ink and a fountain solution are supplied by an ink device and a water supply device (not shown) to form an image. Reference numeral 17 denotes a transfer cylinder which is rotatably supported between the left and right frames with the circumferential surface of the transfer cylinder 16 being in contact with the back printing pressure cylinder 16 and rotating in the direction indicated by the arrow in the figure. Backing impression cylinder
It is configured to be replaced with 16 nails. The front printing unit 4 for the first color has a front printing cylinder 18 having the same diameter as the back printing cylinder 16 and rotating in the direction indicated by the arrow in the figure, and is rotatable with the peripheral surface thereof in contact with the back printing cylinder 16. The two impression cylinders 1
Between 6 and 18, gap T ₁ is provided to be adjusted by the gap adjusting device which will be described later. Above the front impression cylinder 18, a blanket cylinder
19 is supported with its peripheral surface in contact with the
Above the plate cylinder 20, a plate cylinder 20 having a printing plate mounted on the peripheral surface is pivotally supported with the peripheral surface facing the plate cylinder 20. The plate cylinder 20 is provided with an ink device and a water supply device for supplying ink and dampening solution to the plate surface. The second-color surface printing unit 5 also includes a surface impression cylinder 21, a blanket cylinder 22, and a plate cylinder 23.
23 is provided with an inking device and a water supply device. A transfer cylinder 24 having the same diameter as these is provided between the front impression cylinders 18 and 21.
The paper 7 transferred between the two impression cylinders 16 and 18 due to the change of the claws is arranged in the transfer cylinder 24.
It is configured to be delivered and conveyed between the two impression cylinders 18 and 21 via a.

The clearance adjustment device generally denoted by reference numeral 25 includes both the eccentric bearings 13 and 15 and a rod 26 as a connecting member that connects the outer peripheral portions thereof.The outer peripheral portion of the eccentric bearing 13 includes: An operating rod 27 is pivotally mounted. One end of the operation rod 27 is inserted into a hole of a stud 28 pivotally attached to the frame, and a screw hole of a knob 29 is screwed into a screw portion of the protruding end so as to be able to advance and retreat. Thus, when the knob 29 is pinched and rotated, the operation rod 27 advances and retreats in the direction of the arrow by the screw action, and the eccentric bearing 13 moves to the axis Y.
Around the shaft center O so that the clearance T
Is configured to be adjusted. Further eccentric bearing 13
Is rotated, the eccentric bearing 15 connected by the rod 26 is rotated around the axis X so that the axis P rotates.
T ₁ is configured to be adjusted.

The paper discharge device 6 includes a paper take-up cylinder 30 which rotates in contact with the front printing pressure cylinder 21.
And a pair of sprockets 31 fixed to both end shafts thereof. Between the sprocket 31 and the sprocket 32, a paper discharge chain 33 for transporting the printed paper 7 is stretched. Reference numeral 34 denotes a paper platform on which the paper 7 released from the holding of the claws of the paper output chain 33 is loaded.

The operation of the printing press configured as described above will be described. The paper 7 on the loading table 8 is sucked one by one by the suction port of the sucker device, sent out onto the feeder board 9, registered on the difference plate 10, and then replaced with the claws of the transfer drum 17 by the swing device. Transported. The paper 7 is replaced by the claws of the back printing pressure cylinder 16 and is conveyed by rotation of the cylinder, and passes between the two cylinders 14 and 16. Since the image is transferred to the blanket surface,
This image is transferred to the back surface of the paper 7 and subjected to back printing. The back-printed paper 7 is conveyed by being changed from the claws of the back printing impression cylinder 16 to the claws of the front printing impression cylinder 18, and passes between the two cylinders 18 and 19. Since the image has been transferred to the blanket surface of the blanket cylinder 19, the image is transferred to the surface of the paper 7 and the first color printing is performed. After that, the paper 7 conveyed through the transfer drum 24 is applied to the paper
After being subjected to color printing, the paper is conveyed by the conveyance chain 33, and then discharged onto the paper stacking platform and stacked.

When the thickness of the paper 7 is changed, when the knob 29 is pinched and rotated, the operation rod 27 moves forward and backward by the screw action and the eccentric bearing 13 rotates. Moves to adjust the gap T between the back printing blanket cylinder 14 and the back printing pressure cylinder 16 according to the paper thickness. Further, the rotation of the eccentric bearing 13 rotates the eccentric bearing 15 connected to the eccentric bearing 13 by the rod 26, and the eccentric action moves the back printing pressure cylinder 16 to move the back printing pressure cylinder 16
The gap T ₁ of the the table printing impression cylinder 18 is adjusted to correspond to the paper thickness. That is, gap T ₁ is adjusted in conjunction with the adjustment of the gap T.

In this embodiment, an example in which the operating rod 27 is moved forward and backward by a manual operation has been described, but the operating rod 27 may be driven forward and backward by an air cylinder or the like.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in a two-sided printing sheet-fed printing press, a back printing cylinder, and a back printing cylinder which is in contact with the back printing cylinder and the front impression cylinder with a gap therebetween. The impression cylinder is supported by an eccentric bearing in which the shaft center of the bearing inner circumferential circle and the shaft center of the supporting outer circumferential circle are eccentric, and the outer peripheral portions of these two eccentric bearings are connected by a connecting member. By connecting the rotating operation members, when the paper thickness is changed, the gap between the back printing press cylinder and the front printing press cylinder is adjusted in conjunction with the gap adjusting operation between the back printing press cylinder and the back printing press cylinder. As a result, an appropriate gap corresponding to the paper thickness is ensured, so that the printing register is not misaligned due to poor holding of the paper and the quality of the printed matter is improved. Further, it is not necessary to make the gap larger than the maximum paper thickness, and the minimum amount of backlash is ensured, so that noise and printing trouble can be prevented. Furthermore, the operability is improved because the two gaps can be adjusted simultaneously.

[Brief description of the drawings]

1 and 2 show an embodiment of an apparatus for adjusting a gap between cylinders of a sheet-fed printing press according to the present invention. FIG. 1 is a schematic front view of the apparatus, and FIG. 1 is a schematic front view of a single-color printing sheet-fed printing press. 1 ... printing machine, 7 ... paper, 12 ... back plate cylinder, 13, 15 ...
Eccentric bearings, 13a, 15a… support outer circumference circle, 13b, 15b… shaft support inner circumference circle, 14… back printing rubber cylinder, 16… back printing pressure cylinder, 18… front printing pressure cylinder, 25… Clearance adjustment device, 26… Rod, 27… Operation rod, 29… Knob, O, P ……
X, Y… Axial axis of support outer circumference circle, T, T ₁ … Gap, t, t ₁ ……
Eccentric amount.

Claims (1)

(57) [Claims] 1. A printing cylinder for back-printing, and a back-press cylinder in contact with the printing cylinder for back-printing and the front-side printing cylinder with a gap therebetween, the shaft center of the inner circumferential circle of the bearing and the supporting outer-circle circle. The double-sided printing sheet is characterized in that the eccentric bearings are eccentrically supported by an eccentric bearing, and the outer peripheral portions of both eccentric bearings are connected by a connecting member, and a rotating operation member is connected to one of the eccentric bearings. A device for adjusting the clearance between cylinders of a printing press.