JPS58175663A - Printing machine ink supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink supply device in a printing press that supplies printing ink that has flowed out from an ink fountain and been transferred between rollers to a plate surface on a plate cylinder.

In a printing press, printing ink stored in an ink fountain flows out from the gap between a fountain roller rotating inside the ink fountain and an ink blade whose tip is in contact with the circumferential surface of the fountain roller, and is passed through a plurality of mixing rollers. The ink is transferred while being leveled in the circumferential direction and axial direction by the vibration roller and the ink roller, and is then supplied to the plate surface on the plate cylinder by a plurality of ink forming rollers. The ink forming roller, which is in contact with the printing plate in the printing state, separates from the printing plate in conjunction with the removal of the printing cylinder when the state is not printing, and when the printing state shifts to the printing state, the ink forming roller is in contact with the printing cylinder. They are linked and brought into contact with the hanmen.

FIG. 1 is a schematic side view of a single-color double-sided printing offset rotary press as an example of a conventional printing press, and FIGS. 2 and 3 are side views of a conventional ink supply device, respectively. To give an overview of the printing press, the printing unit 2 of the printing press 1 includes an upper printing device 3 and a lower printing device 4, which are disposed with blanket cylinders 5°6 vertically facing each other. The printing devices 3 and 4 are provided with blanket cylinders 5 and 6 as well as plate cylinders 7 and 8 that are in contact with the blanket cylinders 5 and 6. A plurality of ink application rollers 9, 10 are removably attached to the circumference of the plate mounted on each plate cylinder 7, 8, and include ink fountains 12 and 12 for storing ink for printing. An inking device for transferring ink from a group of rollers (not shown) to a reinking roller 9 and 10 is attached. Further, a transfer cylinder 13 and a transfer cylinder 14 are in contact with the upper rubber cylinder 5. Then, the sheets fed one by one onto the differential plate 16 by the sheet feeding device 15 pass through the swing 17 and the transfer cylinder 13, and are then picked up by the claws of the blanket cylinder 5. On the other hand, the ink forming roller 9.10 and the water supply device 18.19 form an image on the printing plate and the upper and lower blanket cylinders 5
, 6, so that the images on the blanket cylinders 5 and 6 are transferred to both sides of the paper that is conveyed by the claws of the blanket cylinder 5, and double-sided printing is performed. The sheets are sequentially gripped and conveyed by the transfer cylinder 14 and the claws of the sheet discharge chain 20, and then released and dropped onto the sheet stacking table 21, where they are stacked. To remove the printing cylinder when the state shifts to a non-printing state, first remove the lower blanket cylinder 6 from the upper blanket cylinder 5, then remove the transfer cylinder 14 from the upper blanket cylinder 5, and then remove the upper blanket cylinder 6 from the upper blanket cylinder 5. is removed from the plate cylinder 7.

Also, as mentioned above, in conjunction with this, the ink forming roller 9
, 10 are separated from the plate surfaces on the plate cylinders 7, 8. Further, when transitioning from a non-printing state to a printing state, this reverse order is used.

However, when attaching and detaching the torso as described above,
The upper blanket cylinder 5 and the transfer cylinder 14, which are equipped with claws for conveying the paper, move each time the cylinders are attached and detached, and the position where the paper is gripped changes, making it impossible to maintain registration accuracy. There was a problem that noise and scratches were generated when the body was attached and detached.

Therefore, an arrangement has been proposed in which the arrangement of the trunks is the same as that shown in FIG. 1, but only the mechanism for attaching and removing the trunks is improved. That is, in this case, in FIG. 1, the lower blanket cylinder 6 is first removed from the upper blanket cylinder 5 and the lower plate cylinder 8, and then the upper plate cylinder 7 is removed from the upper blanket cylinder 5. However, in the case of doroi, it is performed in the reverse order. This eliminates the movement of the barrel with the claws. Therefore, ink supply devices that can accommodate such a cylinder attachment/detachment device have been proposed, and FIGS. 2 and 3 respectively show side views of conventional ink supply devices of this type. . First, to explain what is shown in Fig. 2, the plate cylinder 7 is supported by an eccentric bearing whose inner circumferential circle and outer circumferential circle are eccentric by an amount indicated by the symbol t in the figure, and this eccentric bearing is rotated. Accordingly, the plate cylinder 7 is configured to be attached to and detached from the upper blanket cylinder 5. When starting the printing operation, the air cylinder 22 is operated and the piston rod 23 is extended, so that the L-shaped bar 24 rotates counterclockwise in the figure to the state shown in the figure, and the cam lever 25 is moved to the supporting shaft. The cam surface 25a and the cam follower 2 rotate counterclockwise around the cam surface 25a and occupy the position shown in the figure.
6, the roller arm 2B is rotated by the elastic force of the compression coil spring 29, and the ink applying roller 9 supported by the roller arm 2B is pressed against the plate surface of the plate cylinder 7, and ink is supplied. When the ink has been supplied to the entire plate surface, the plate cylinder 7
At the same time that paper is fed between the upper and lower blanket cylinders 5 and 6, the eccentric bearing of the plate cylinder 7 rotates, and the plate cylinder 7 is inserted into the upper blanket cylinder 5. Moreover, in the case of removing the body, the process is performed in the reverse order.

However, in such a conventional ink supply device, when the plate cylinder 7 is in the unloaded state, the cam lever 25 escapes and the ink forming roller 9 is pressed, so that the plate cylinder 7 is not inserted into the cylinder. The ink form roller 9 will be pressed with a pressure greater than the normal contact pressure at that time, and this overpressure may reduce the durability of the ink form roller 9. There was a problem in that the contact pressure of the ink form roller 9 changes when the ink is inserted into the cylinder, which tends to cause printing problems such as shock marks.Therefore, as shown in Fig. 3, the roller arm 28 is By providing a bolt-type stopper 30 and bringing it into contact with the outer periphery of an eccentric bearing 31 that pivotally supports the plate cylinder 7, the movement of the inking roller 9 can be made to follow the movement of the plate cylinder, thereby avoiding the above-mentioned overpressure. However, in this case, skill is required to adjust the stopper 30, and it is impossible to perform this adjustment during operation. The plate cylinder 7 may wear out in a short period of time, making adjustment difficult, or the direction of movement of the plate cylinder 7 and the axial direction of the stopper 30 may be misaligned, making it difficult to maintain a constant contact pressure. There were many points.

The present invention was developed in view of the above points, and the cam for attaching and detaching the ink forming roller to and from the plate cylinder is formed in three stages and is fitted into the concentric part of the plate cylinder of the eccentric bearing of the plate cylinder. By rotating this cam in two stages before and after the plate cylinder loading operation, the change in contact pressure of the ink forming roller with respect to the plate cylinder before and during the plate cylinder loading operation is reduced, and overpressure is avoided and the ink is injected. The present invention provides an ink supply device for a printing press that improves the durability of the formation roller and prevents printing failures. Embodiments of the present invention will be described in detail below with reference to the drawings.

This embodiment shows an example in which the present invention is applied to a single-color double-sided printing offset rotary printing press. Fig. 4 is a side view thereof, Fig. 5 is a developed plan view partially cut away, and Fig. 6 is a partially cutaway plan view. FIG. 7 is a side view of the vicinity of the ink forming roller. Of the two printing cylinder attachment and detachment devices described above, this device is applied to the latter device that attaches and detaches the plate cylinder to and from the blanket cylinder. The explanation of the order of attachment and detachment will be omitted, and will be explained later using the same figure if necessary. In these figures, the frame 41 of the printing unit 2 has an outer circumferential circle 42.
An eccentric bearing 42 with a flange, in which the axial center F of a and the axial center Fl of the inner circumferential circle 42b are eccentric by an amount indicated by the symbol t in the figure, is attached to the outer circumferential circle 4.
2a is rotatably supported on the shaft, and the inner circumferential circle 42b has a
A cylinder gear 43 rotatably supports the plate cylinder 7 which is drivingly connected to the driving side and rotates. A nine rod 44 is pivotally attached to the flange of the eccentric bearing 42, and extends downward, and its lower end is pivotably attached to a lever with a roller (not shown), and receives signals from the paper feeder side and manual pushbutton operation. The eccentric bearing 42 is rotated by moving the rod forward and backward in the vertical direction via an air cylinder and a cam, and the plate cylinder 7 is attached to and detached from the upper blanket cylinder 5 by the eccentric action. has been done. Plate cylinder 7
A pair of shaking rollers 45 are installed above the left and right frames 4.
At both ends of each swinging roller 41, there is a nine roller arm 46 formed in an L shape as shown in FIGS. Each pair of roller arms 47 is loosely mounted adjacent to each other, and movement in the axial direction is restricted by a nut 4B. Note that these roller arms 46.
47 has a different shape, but the structure is the same, so only the roller arm 46 is shown in FIG. 4, and only the roller arm 46 side will be described thereafter. The roller arm 46 has one free end formed in a split-shape shape, and the shaft hole of the split part is formed in three stages with a bearing part 49a, a shaft support 49b, and a fitting part 49C. The roller holder 49 has its shaft support 49b pivotally supported and is fixed by split fastening. This roller holder 49 has a concentric bearing portion 49.
a, the shaft center F2 of the fitting part 49C and the shaft center of the shaft support 49b are eccentric by the amount shown by the symbol t2 in the figure,
The ink forming roller 9 is rotatably supported with its circumferential surface in contact with the circumferential surface of the plate cylinder 7. In addition, the inset part 49
A bearing pin 50 formed in a step shape is capped on C and fixed with a set screw, and by loosening the split fastening and applying a spanner to the hole of this bearing pin 50 to rotate it, an eccentric effect can be applied. The ink forming roller 9 is rotated eccentrically, and the contact pressure against the swinging roller 45 and the plate cylinder 7 is set in accordance with the thickness of the ink forming roller 9. Further, the small diameter portion and the large diameter portion of the bearing pin 50 are eccentric by the same amount as the eccentricity amount indicated by the symbol tlI, and the bearing pin 5o is subjected to the eccentric phase in the same phase as the eccentric phase of the roller holder 49. A cam follower 51 is fitted and fixed to the small diameter portion of the cap, that is, the small diameter portion concentric with the inking roller 9 . Reference numeral 52 denotes a spring shaft which is fixed to the frame 41 with bolts and slidably supported by a protruding post 53, whose lower end is pivotally connected to the other free end of the roller arm 46 by a pin 54. A compression coil spring 55 is mounted on the spring shaft 52 for applying a rotational force to the roller arm 46 in the direction of pressing the ink forming roller 9 against the plate cylinder 7 . Further, an adjusting nut 56 for adjusting the contact pressure of the ink placement roller 9 against the plate cylinder 7 is screwed onto the threaded portion of the spring shaft 52 protruding from the post 53. A groove is provided on the outer peripheral portion to engage the protrusion of the locking plate spring 57.

The ink form roller device configured in this manner is provided with a detachable device for attaching and detaching the ink form roller 9 to and from the plate cylinder 7. It is composed of a detachable cam 6o and a drive device 61 that rotates the detachable cam 6o. The driving device 61 includes a pair of air cylinders 6 connected with the pistons extending in opposite directions.
2.63, and a rod end 65 screwed onto the working end of the piston rod 64 of the air cylinder 62 is pivotally supported by a supporting shaft 66 that is fixed to the frame 41 with a bolt and projects. To do this, the piston rod 64
remains stationary, and the cylinder is guided by a guide 67 to move forward and backward.

Further, a rod end 68a screwed onto the working end of the piston rod 68 of the other air cylinder 63 protrudes in the radial direction from the tip of a lever shaft 69 rotatably mounted between the left and right frames 41. The piston rod 68 is pivotally connected to the free end of the lever 7o so that the cylinder remains stationary and the piston rod 68 expands and contracts. A bracket 11 is fixed to the frame 41 and supports the protrusion of the lever shaft 69. Then, the lever shaft 69 and the roller attachment/detachment cam 6o
are connected like a link by a lever 72 and a connecting rod 75 whose both ends are pivotally connected by pins 73 and 74.

On the other hand, the roller attachment/detachment cam 60 is integrally formed with a disc-shaped cam body and a boss fitted into a circular hole of the cam body and fixed with a set screw. It is rotatably fitted onto the outer circumferential surface 42C of the protruding eccentric bearing 42. The outer circumferential surface 42C is formed concentrically with the inner circumferential axis Fi of the eccentric bearing 42, that is, the axis of the plate cylinder 7. Additionally, three elongated holes 76 are drilled in the cam body, dividing the circumferential direction into 73 equal parts.
A bushing 77 with a flange fitted into the frame 6 is fixed to the frame 41 with a bolt 78. By doing this, the roller attachment/detachment cam 60 is restricted from moving in the axial direction, and by making the outer diameter of the bushing 77 sufficiently smaller than the inner diameter of the elongated hole 76, eccentric movement of the plate cylinder 7 is prevented. It is possible to follow and move. The outer peripheral cam surface of the roller attachment/detachment cam 60 mounted in this manner has a large diameter portion 60a for each ink forming roller 9, and
It is formed into a three-stage shape with a medium diameter part 60b and a small diameter part 60C, and the diameter of each part is set as follows. Suwachi,
The large diameter portion 60a is a cam surface that contacts the cam follower 51 when the plate cylinder 7 is removed from the blanket cylinder 5, and at this time, the ink forming roller 9 is separated from the plate cylinder 7. It is set so that The medium diameter portion 60b is a cam surface that brings the cam follower 51 into contact with the plate cylinder 7 just before it is inserted into the blanket cylinder 5 and during the insertion operation, and at this time, the ink forming roller 9 is It is set so that it is in pressure contact with 7. Note that when the cam follower 51 is in contact with the large diameter portion 60a and the medium diameter portion 60b, the roller arm 46 is compressing the compression coil spring 55, and there is no space between the adjustment nut 56 and the post 53. A gap is formed. Further, the small diameter portion 60c is connected to the cam follower 51 when the anti-slip plate cylinder 7 is completely inserted into the blanket cylinder 5.
At this time, the ink form roller 9 is in pressure contact with the plate cylinder 7, the adjustment nut 56 is in contact with the post 53, and the ink form roller 9 is in contact with the compression coil spring 55. It is pressed against the plate cylinder 7 by a preset spring pressure.

The operation of the ink supply device configured as above will be explained. After manually inserting the plate cylinder 7 prior to printing work,
Roller arm 46.4 which is the shaft support of ink forming roller 9
7 is loosened and the bearing pin 50 is rotated to adjust the contact pressure to the swing roller 45 to match the diameter of the ink forming roller 9. Also, by rotating the adjustment nut 56, the compression coil spring 55 is adjusted. By expanding and contracting, the contact pressure of the inking roller 9 with respect to the plate cylinder 7 is adjusted. Then, the plate cylinder 7 is manually removed from the blanket cylinder 5, and the ink loading and unloading cam 60 is rotated by manually operating the air cylinders 62 and 63, so that the size of the cam 60 is increased as shown in FIG. When the diameter portion 60a is opposed to the cam follower 51, the ink forming roller 9 is separated from the plate cylinder 7.

In this state, when the cylinder attachment/detachment is switched to automatic and printing work is started, the air cylinder 63 is actuated by a signal from a timing regulating device (not shown) and the piston rod 68 is contracted. The detachable cam 60 rotates on the outer peripheral surface 42C of the eccentric bearing 42 in the counterclockwise direction in FIG.
0 to the middle diameter portion 60b. Therefore, the ink application roller 9 is pressed against the plate surface of the plate cylinder 7 by the swinging of the roller arms 46 and 47 due to the elastic force of the compression coil spring 55, and ink is supplied to the plate surface. In this case, since the medium diameter portion 60b serves as a stopper, the contact pressure of the inking roller 9 does not become excessive. A moment later than this, the cylinder for attaching and detaching the plate cylinder 7 operates and pulls the rod 44 downward.
The eccentric bearing 42 rotates, and the plate cylinder 7 is inserted into the blanket cylinder 5 due to its eccentric action. In this case, the ink attachment/detachment cam 6
0 is fitted to the outer peripheral surface 410 concentric with the plate cylinder 7, and the plate cylinder 7
The ink forming roller 9 moves eccentrically following the movement of the plate cylinder 7, and the relative position between the ink forming roller 9 and the plate cylinder 7 does not change before and after the printing process.
The contact pressure of the ink forming roller 9 does not change. Further, as the roller attachment/detachment cam 60 moves, the elongated hole 76 is displaced relative to the bolt 78 fixed to the frame 41, but since the bush 77 has a smaller diameter than the elongated hole 76, this movement is not hindered. . In addition, before inserting the body, Bost 5
Adjustment nut 56, which was separated from 3, is now fully inserted.
There is no gap with the boss 53. At the same time as the cylinder insertion is completed, the other air cylinder 62 operates and the piston rod 64
contracts, and the ink attachment/detachment cam 60 rotates further to face the small diameter portion 60C, but the ink roller arms 46 and 47 do not rotate any further because the ink forming roller 9 is in pressure contact with the plate cylinder 7. The cam follower 51 has a small diameter portion 60C on the cam surface.
It is separated from. Konoto! The adjusting nut 56 continues to rest against the post 53, so that the ink applicator roller 9 is subjected to a predetermined contact pressure preset on the compression coil spring 55.

After an image is formed on the printing plate by supplying dampening water from the water supply device in parallel with ink being supplied to the printing plate in this way, the lower comb cylinder 6 transfers the ink to the upper blanket cylinder 5.
The upper and lower blanket cylinders 5,
Printing is performed on the paper that passes between 6 and 6.

Although this embodiment shows an example in which the present invention is applied to a single-color printing press, it can also be applied to a multi-color printing press.

As is clear from the above description, according to the present invention, in the ink supply device of a printing press, the ink forming roller attachment/detachment cam formed in three stages is mounted on the concentric part of the plate cylinder of the eccentric bearing for the plate cylinder and is driven. The device is connected to a means, and is configured to be rotated one step before loading the plate cylinder to perform ink deposition, then to load the plate cylinder, and then to perform a second rotation. In particular, the contact pressure of the ink form roller does not become excessive before the plate cylinder is inserted, which improves the durability of the ink form roller, and the ink form roller follows the movement of the plate cylinder when the plate cylinder is inserted. Since the contact pressure of the ink forming roller does not change before and after insertion, printing problems such as shock marks can be prevented and the quality of printed matter can be improved.

[Brief explanation of drawings]

Fig. 1 is a side view of a monochrome offset/rotary printing press to explain cylinder attachment/detachment, Figs. 2 and 3 are side views of a conventional ink supply device of the printing press, and Figs. 4 to 7, respectively. 4 shows an embodiment of the ink supply device for a printing press according to the present invention, FIG. 4 is a side view thereof, FIG. 5 is a partially cutaway exploded plan view, and FIG. 6 is a partially cutaway exploded view. The front view and FIG. 7 are side views of the vicinity of the ink forming roller. 1... Printing machine, 5... Rubber cylinder, 7... Plate cylinder, 9... Ink forming roller, 42... Eccentric bearing,
46.47＠...-Roller arm, 51...Fist cam follower, 5-mi battle・φ・Compression coil spring, 60-meeting φφΦ roller detachable cam, 60a・m-・Large diameter part, 60b・・Fist Medium diameter part, 60c fist... Small diameter part, 62, 63... Air cylinder, F1φ... Axis center of plate cylinder. Patent Applicant Komori Printing Machinery Co., Ltd. Agent Masaki Yamakawa (and one other person) 19- Figure 6 Figure 7 Procedural Amendment Export) 1. Display of the case 1982 Patent No. 59140 2, Name of the invention Printing machine ink supply device 3, Person making the amendment Relationship to the case Patent applicant 5, Drawing subject to the amendment 6, Contents of the amendment No. Correct Figure 3 as shown in the attached sheet.

Claims (1)

[Claims] A plate cylinder is supported by an eccentric bearing and is attached to and detached from the mating cylinder by the rotation of the eccentric bearing, and a plate cylinder is supported by a swingable roller arm and is attached to and detached from the plate cylinder by the swing of the roller arm. In a printing press equipped with an ink forming roller, a roller attachment/detachment cam having an outer peripheral cam surface corresponding to the cam follower on the roller arm side and rotatably fitted in a concentric circle of the plate cylinder of the eccentric bearing; a driving means for rotating the cam; and a contact pressure adjusting means for the inking roller, which includes a spring member that applies a rotational force to the roller arm in the direction of pressing the cam follower against the cam surface; The cam surface of the removable cam is connected to the large diameter part that allows the cam follower to come into contact with the inking roller when the plate cylinder is removed and separates the ink form roller from the plate cylinder, and the cam follower that makes contact with the cam follower immediately before and during the inserting operation of the plate cylinder. Printing characterized in that the ink forming roller is formed in three stages, including a medium diameter portion that faces the plate cylinder and a small diameter portion that faces the cam follower with a gap when the plate cylinder is completely loaded. Machine ink supply device. .