JPH0818428B2 - Ink device for printing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an inking device for a printing press for supplying ink to a printing plate.

[Conventional technology]

The inking device of the printing machine that supplies ink to the surface of the plate mounted on the plate cylinder is equipped with an ink fountain that stores ink and a group of rollers that evenly knead in each direction while transferring the ink that flows from this ink fountain. The ink transferred to the shaking roller at the end of the roller group is supplied to the plate surface via the ink forming roller. The swing roller of such an inking device is
The inking roller is rotated and laterally driven from the driving side, and the inking roller is supported by the shaft end of the shaking roller via an arm and is in contact with the shaking roller. The ink application roller is configured to be attached to and detached from the plate surface by swinging the arm. In this way, the inking roller, which is in contact with the swing roller and the plate surface and transfers the ink while rotating, is generally driven by a gear connected to the swing roller and driven to rotate by a groove cam provided at the end. It was driven sideways.

Further, Japanese Patent Application Laid-Open No. 60-101049 proposes that the inking roller is rotated and laterally swung by friction between the shaking roller and the peripheral surface without being actively driven.

By the way, shaking the inking roller is performed to disperse a partial pattern residue called a ghost on the plate surface, but if the inking roller and the shaking amount are large, the durability of the mechanism and the plate surface Since the printing durability, that is, the ability to withstand printing of the printing plate, that is, the so-called plate retention, decreases, it is preferable that the swing amount is small, and it is desirable to adjust the swing amount according to the ghost level.

[Problems to be solved by the invention]

However, the inking roller in the above-mentioned conventional inking device cannot be adjusted not only in one provided with a grooved cam but also in one laterally driven by friction with the shaking roller, so that the amount of shaking cannot be adjusted. There was a problem that the above did not resolve. In particular, in the case where the groove cam was provided, the swing mechanism could not be stopped, and in order to increase the durability, a roller that does not swing and a roller that swings were prepared and exchanged according to the printed matter. However, there was a problem that the preparation time was extended including the above and the productivity was lowered and the amount of waste paper generated at that time was increased.

[Means for solving problems]

In order to solve such a problem, according to the present invention, an inking roller is fitted to a rotatable roller shaft whose movement in the axial direction is regulated, and to the roller shaft so as to be rotatable and swingable, A roller body that is rotated and laterally driven by friction with a swinging roller, a swinging width adjusting member that is screwed to screw portions at both ends of the roller shaft so as to be axially movable, and the swinging width adjusting member and the roller. The left and right compression coil springs are interposed between the both ends of the main body to store elastic force, and regulate the lateral swing of the roller main body at a compression limit adjusted by the swing width adjusting member.

[Action]

When the swing roller rotates and swings sideways, the inking roller that contacts this also swings and swings sideways. At this time, the lateral swing of the roller body is restricted at the position where the compression coil spring has been compressed, and the swing amount is determined by the adjusting position of the swing width adjusting member.

〔Example〕

1 and 2 show an embodiment of an inking device according to the present invention. FIG. 1 is a partially cutaway plan view of an end portion of an inking roller, and FIG. 2 is a double-sided rotary printing in which the present invention is embodied. FIG. In the figure, a printing unit of a printing machine is provided with two sets of upper and lower printing devices 1 and 2, and each printing device 1 and 2 is provided with a plate cylinder 3 having a printing plate mounted on its peripheral surface. Each plate cylinder 3 has an ink fountain 4 that stores ink.
And an inking device 7 including a large number of roller groups 6 including a pot roller 5, and a water supply device 10 including a water boat 8 for storing dampening water and a plurality of rollers 9. Reference numerals 11 are upper and lower blanket cylinders that are respectively in contact with the plate cylinder 3, and the blanket cylinders 11 are also in contact with each other, and a blanket is wound around the peripheral surface thereof. Reference numeral 12 is a web that is run while being sandwiched between the upper and lower blanket cylinders.

In the roller group 6 of the inking device 7 in the printing devices 1 and 2 as described above, two swinging rollers 13 and three inking rollers 14 are arranged at the end portions of the plate cylinder 3 adjacent to each other. That is, the swing roller 13 is axially supported by the left and right frames and is rotationally driven from the driving side, and the swing mechanism provided at the shaft end portion reciprocates in the axial direction at a predetermined cycle and swing width to laterally move. It is configured to shake. An arm (not shown) is fixed to both end shafts of the oscillating roller 13, and a roller shaft 16 forming an ink application roller 14 is provided at its own step on a bearing 15 provided at a free end of the arm. It is rotatably supported by being restricted from moving in the axial direction. A roller body 17 that forms the inking roller 14 together with the roller shaft 16 is fitted on the roller shaft 16 via a plurality of slide bearings 18, and is rotatable with respect to the roller shaft 16 and axially. It is reciprocally movable. The roller body 17 is formed of a metal tube 17a and a rubber 17b covering the metal tube 17a. With this structure, when the arm is swung, the inking roller 14 is brought into contact with the swing roller 13 and the plate cylinder 3, and is rotated by the friction with the swing roller 13 and swings sideways. Reference numeral 19 is an oil hole for lubricating the slide bearing 18, and 20 is a grease cap. The inking roller 14 is provided with a mechanism that regulates the lateral swing end and adjusts the swing amount. That is, a swing width adjusting screw 21 with a flange is screwed to the screw portions 16a provided at both ends of the roller shaft 16, and is configured to advance and retreat on the screw portion 16a by rotating this. ing. Reference numeral 21a is a screw for fixing the swing width adjusting screw 21 at the adjusting position, and 21b is a hole for inserting the turning spanner. This swing width adjusting screw
A plurality of compression coil springs 22 are interposed between the flange of 21 and the bottom surface 17c of the hole portion of the roller body 17 while accumulating elastic force. By doing so, when the roller body 17 shakes, the left and right compression coil springs 22 are alternately compressed, and the lateral swing is regulated at the end of compression. Then, when the swing width adjusting screw 21 is tightened, for example, the compression coil spring 22 is compressed, so that the amount of compression is reduced and the swing amount is reduced.

The operation of the printing press thus configured will be described. When ink and dampening water are stored in the ink fountain 4 and the water tank 8, and the machine is operated, the ink flowing out from the ink fountain 4 is kneaded while being transferred between the roller groups 6, and is evened in each direction. It is supplied to the printing plate by the deposition roller 14. The dampening water pulled up from the water boat 8 is leveled in each direction by the rollers 9 and supplied to the plate surface. An image is formed on the plate surface by the supplied ink and dampening water, and this image is transferred to the blanket cylinder 11 and then to the web for double-sided printing.

In such a printing operation, the swing roller 13 is driven from the driving side and swings sideways while rotating, so that the roller body 17 of the inking roller 14 which is in contact with the swing roller 13 also rolls due to friction with the swing roller 13. Rotate sideways on the shaft 16 and rotate with the roller 16. When the roller body 17 is laterally swung, the left and right compression coil springs 22 are alternately compressed to move forward and backward, so that the impact at the swing end is alleviated and the roller body 17 moves when the compression coil spring 22 is completely compressed. After that, only the swing roller 13 swings sideways. That is, the lateral swing amount of the roller body 17 is restricted by the compression coil spring 22. Then, for example, when it is desired to increase the swing amount, the screw 21a is loosened, the spanner is projected into the hole 21b, and the swing width adjusting screw 21 is rotated in the loosening direction.
When 21a is tightened, the compression coil spring 22 extends and the compression margin increases, so that the swing amount of the roller body 17 increases.
Also, tightening the swing width adjusting screw 21 reduces the swing amount,
The swing amount can be adjusted arbitrarily. Therefore, if the swing amount of the inking roller 14 is adjusted according to the pattern of the printed matter, the swing amount of the inking roller 14 with respect to the plate surface changes, and the ghost can be dispersed according to the pattern.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, in the inking device of the printing machine, the inking roller is provided with a rotatable roller shaft whose movement in the axial direction is restricted, and a swing and lateral swing motion on the roller shaft. A roller main body which is freely fitted and is driven to rotate and laterally swing by friction with the swing roller; and a swing width adjusting member which is screwed to threaded portions at both ends of the roller shaft so as to be axially movable and adjustable. The left and right compressions, which are interposed between the swing width adjusting member and both ends of the roller body by accumulating elastic force and restrict the lateral swing of the roller body at a compression limit adjusted by the swing width adjusting member. By virtue of the configuration of the coil spring, when the oscillating roller rotates and laterally oscillates, the inking roller that is in contact therewith also oscillates and laterally oscillates. In addition to being regulated at a certain position, the swing width can be arbitrarily adjusted by rotating the swing width adjusting member, so that the ghost is appropriately dispersed according to the printed matter, and the quality of the printed matter is significantly improved. At the same time, since the swing width is adjusted by screwing the swing width adjusting member, the lateral swing amount of the roller body can be adjusted accurately and easily. Further, since the swing amount can be minimized, the durability of the mechanism and the printing durability of the printing plate are improved. Further, since the impact at the end of swinging the roller body is absorbed by the compression coil spring,
It enables quiet operation with less wear and tear. In addition, since the roller shaft is rotatable, the same supporting structure can be used for the wearing roller that is rotatably supported and does not have the lateral swing function. Therefore, the supporting structure is modified. The printer can be used in common without the need.

[Brief description of drawings]

1 and 2 show an embodiment of an inking device of a printing machine according to the present invention. FIG. 1 is a partially cutaway plan view of an end portion of an inking roller, and FIG. It is a cylinder arrangement figure of a rotary printing press. 13 …… Shaking roller, 14 …… Inking roller, 16 …… Roller shaft, 16a …… Screw part, 17 …… Roller body, 21 …… Swing width adjusting screw, 22 …… Compression coil spring.

Claims (1)

[Claims] 1. An inking device of a printing machine, comprising an oscillating roller which is rotationally driven from a driving side and laterally oscillating in an axial direction, and an inking roller which is in contact with the oscillating roller. A rotatable roller shaft whose movement in the axial direction is restricted, a roller body fitted to the roller shaft so as to be rotatable and swingable, and driven to rotate and swing by friction with the swing roller, and the roller. A swing width adjusting member screwed into a screw portion at both ends of the shaft so as to be movable and adjustable in the axial direction, and an elastic force is accumulated between the swing width adjusting member and both ends of the roller body, and is interposed. An inking device for a printing press, comprising left and right compression coil springs that regulate lateral swing of the roller body at a compression limit adjusted by the swing width adjusting member.