JP2598273B2 - Printing machine ink unit - 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 unit of a printing press that supplies ink to the surface of a plate mounted on a plate cylinder consists of an ink fountain that stores ink, and a group of rollers that uniformly kneads ink flowing from this ink fountain in each direction while transferring ink. The ink transferred to the swing roller at the end of the roller group is supplied to the printing plate via the ink application roller. The swing roller of such an ink device is rotated and oscillated from the driving side,
The ink application roller is supported by the shaft end of the swing roller via an arm and is in contact with the swing roller. The ink application roller is configured to be attached to and detached from the plate surface by swinging the arm. The ink application roller that transfers ink while rotating in contact with the swing roller and the plate surface in this manner is generally connected to the swing roller by a gear and driven to rotate by a groove cam provided at an end. Japanese Patent Application Laid-Open No. 60-101049 proposes an apparatus in which the ink application roller is not positively driven but is rotated and oscillated by friction between the peripheral surface of the ink roller and the roller.

By the way, this ink roller is shaken in order to disperse a partial pattern residue on the plate surface, which is called a ghost. Since the printing durability deteriorates, 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 ink application roller in the conventional ink device described above cannot be adjusted not only with the grooved cam but also the one that is driven to oscillate by friction with the oscillating roller. There was a problem that did not resolve. In particular, with a grooved cam, the swing mechanism could not be stopped, and in order to increase durability, a roller that does not swing and a roller that swings were prepared and exchanged according to the printed material, so the nip adjustment However, there is a problem that the preparation time is extended, including the above, and the productivity is reduced and the amount of waste paper generated at that time is increased.

[Means for solving the problem]

In order to solve such problems, in the present invention, the ink application roller, a roller shaft whose movement in the axial direction is regulated,
A swing width adjusting screw formed of a roller body supported on the roller shaft so as to be movable in the axial direction, and being screwed to both ends of the ink applying roller so as to be axially movable and adjustable on the roller shaft; An air chamber closed with the end of the roller body, and an air passage closed by the swing width adjusting screw when the air chamber is moved in the axial direction of the roller body; And a flow rate adjusting member for expanding and contracting the sectional area of the air passage is provided.

[Action]

When the oscillating roller rotates and oscillates, the ink application roller in contact with the oscillating roller also rotates and oscillates. At this time, the roll of the roller body is buffered by compressing the air in the left and right air chambers connected by the air passage, and the movement limit is restricted. By moving the swing width adjusting screw forward and backward, the cross sectional area of the air chamber changes and the swing width is adjusted, and by operating the flow rate adjusting member, the cross sectional area of the air passage changes and the swing amount and swing speed are adjusted. Is done.

〔Example〕

1 to 4 show an embodiment of an inking device for a printing press according to the present invention. FIG. 1 is a longitudinal sectional view of an ink application roller, FIG. 2 is an enlarged longitudinal sectional view of an end of an air passage, FIG. FIG. 3 is a schematic plan view showing the vicinity of the ink application roller for explaining a printing state, and FIG. 4 is a cylinder arrangement diagram of a two-sided rotary printing press embodying the present invention. In the figure, a printing unit of a printing press 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 a peripheral surface. Each plate cylinder 3 has an ink fountain 4 for storing ink.
And an inking device 7 including a plurality of roller groups 6 including a jar roller 5 and a water supply device 10 including a watercraft 8 for storing dampening water and a plurality of rollers 9. Numerals 11 denote upper and lower blanket cylinders which respectively contact the plate cylinder 3, and the blanket cylinders 11 also contact each other, and a blanket is wound around the peripheral surface thereof. Reference numeral 12 denotes a web which is held between upper and lower blanket cylinders and travels.

In the roller group 6 of the inking device 7 in such printing devices 1 and 2, two oscillating rollers 13 and three inking rollers 14 are arranged at the end portions of the printing drum 3 near the plate cylinder 3, respectively. That is, the swing roller 13 is rotatably driven from the driving side while being pivotally supported by the left and right frames, and reciprocates in the axial direction at a predetermined cycle and swing width by a swing mechanism (not shown) provided at the end of the shaft. 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. In addition to the roller shaft 16, the ink applying roller 14
The roller body 17 is formed of a pair of left and right bearings 18 slidably fitted on a roller shaft 16, a roller tube 19 in which these bearings 18 are fitted at both ends and integrated, tube
And a rubber tube 20 coated on the roller shaft 19.
It is configured to reciprocate in the axial direction above and rotate with the roller shaft 16. 16a is an oil groove for lubrication. A swing width adjusting screw 21 is screwed into the screw portion 16b at both ends of the roller shaft 16 so as to be rotatable forward and backward, and the outer peripheral surface thereof and both ends of the inner hole of the roller tube 19 are slidably fitted. ing. An air chamber 2 whose cross-sectional area is expanded and contracted by the adjustment of the swing width adjusting screw 21 between each swing width adjusting screw 21 and the bearing 18.
2,23 are respectively formed. Reference numeral 24 denotes a bolt for fixing the swing width adjusting screw 21 after the advance / retreat adjustment. Left and right air chamber 2
2 and 23 are connected by an air passage 25 provided over almost the entire length of the roller tube 19, and the roller shaft 16 and the swing width adjusting screw 21 are stationary in the axial direction, and the roller body 17 reciprocates. The air in the air chamber 22 and the air chamber 23
It is configured such that the air in the inside is alternately compressed.
By this compression, both the air chambers 22 and 23 are alternately sealed, so that the impact at the lateral swing end of the roller body 17 is reduced, and the both ends of the swing width are regulated. The swing width is adjusted by the forward / backward adjustment of the swing width adjusting screw 21. Further, one end of the air passage 25 is opened at the end face of the roller tube 19, and an adjusting screw 26 as a flow rate adjusting member is screwed into a screw hole at the opening end. The cross-sectional area of the air passage 25 is enlarged and reduced so that the air flow rate between the air chambers 22 and 23 is adjusted. The swing amount and swing speed of the roller body 17 are adjusted by the flow rate adjustment.

The operation of the ink device configured as described above will be described. Wet the ink in the ink fountain 4 and the watercraft 8 and store the water,
When the machine is operated, the ink flowing out of the ink fountain 4 is kneaded during the transfer between the roller groups 6, is leveled in each direction, and is supplied to the plate surface by the ink application roller 14. In addition, watercraft 8
The dampening solution pulled up from the plate is leveled in each direction by rollers 9 and supplied to the plate surface. An image is formed on the plate surface with the supplied ink and the dampening solution, and the image is transferred to the blanket cylinder 11 and then further transferred to a web for double-sided printing.

In such a printing operation, the oscillating roller 13 is driven from the driving side to oscillate while rotating. It rotates with the roller bearing 16 while oscillating on the 16. When the roller body 17 is swayed, first, when the roller body 17 moves rightward in FIG. 1, the air chamber 22 is compressed, and the air inside the air chamber 22 is compressed.
When the roller body 17 moves by a predetermined amount, the opening of the air passage 25 is closed by the swing width adjusting screw 21 and the air chamber 22 is sealed. The movement limit is regulated while the shock is alleviated by the pressure,
It moves in the opposite direction together with the swing roller 13. Similarly, when moving to the left in the drawing, the air chamber 23 is compressed and the air chamber 22 is opened, the air chamber 23 is closed, the roller body 17 stops while being buffered, and then moves to the right. . In this way, the roller body 17 continues reciprocating while alternately compressing the air chambers 22,23. Then, when the swing width adjusting screw 21 is rotationally adjusted, for example, in a tightening direction, the entrance of the air passage 25 closes quickly, and the swing width is reduced. Also,
When the swing width adjusting screw 21 is rotationally adjusted in a loosening direction, the swing width increases. Further, when the adjustment screw 26 in FIG. 2 is rotated and adjusted, for example, in the tightening direction, the cross-sectional area of the air passage 25 is reduced, and the flow rate of the air is reduced. Become smaller. By loosening the adjusting screw 26, the swing speed is increased and the swing width is increased. Thus, the swing speed and swing width of the ink applying roller 14 can be freely adjusted by the adjusting screw 26.

As a result, the ink 27 on the ink applying roller 14 spreads as shown in FIG.
Ghosting is eliminated by blurring the edges of the image 28 on the plate cylinder 3.

〔The invention's effect〕

As is clear from the above description, according to the main body, in the inking device of the printing press, the inking roller is supported by the roller shaft whose movement in the axial direction is restricted, and movably in the axial direction by the roller shaft. An air chamber formed with a roller body and closed at both ends of the ink application roller with a swing width adjusting screw which is screwed to the roller shaft so as to be movable in the axial direction and an end of the roller body. Are formed, and these two air chambers are connected by an air passage whose opening with the air chamber is closed by the swing width adjusting screw by the axial movement of the roller body, and the cross-sectional area of the air passage is enlarged and reduced. By providing the flow rate adjusting member, the ink application roller rotates and oscillates with the frictional force with the swinging roller, so that the ghost of the plate surface is dispersed in the roller width direction and the quality of the printed matter is improved. Since the shock at the time shaking of the swing is reduced by air pressure, allowing less operation with wear in quiet. In addition, the swing width and swing speed of the ink application roller can be easily and continuously adjusted by adjusting the rotation of the swing width adjusting screw and the flow rate adjusting member. By being able to set it appropriately and to the minimum necessary, it is possible to satisfy both the durability of the swing mechanism and the printing durability of the plate surface,
The function of the device is improved.

[Brief description of the drawings]

1 to 4 show an embodiment of an inking device for a printing press according to the present invention. FIG. 1 is a longitudinal sectional view of an inking roller.
FIG. 2 is an enlarged longitudinal sectional view of an end portion of an air passage, FIG. 3 is a schematic plan view showing the vicinity of an ink application roller for explaining a printing state, and FIG. 4 is a double-sided rotary printing press embodying the present invention. FIG. 1,2 ... printing machine, 3 ... plate cylinder, 7 ... inking unit, 13 ...
… Swing roller, 14… ink application roller, 16… roller shaft, 16… screw part, 17… roller body, 21… swing width adjustment screw, 22, 23… air chamber, 24… bolt 25 ... air passage, 26 ... adjustment screw.

Claims (1)

(57) [Claims] 1. An inking device for a printing press, comprising: a swing roller driven to rotate from the driving side and driven to oscillate in the axial direction; and an inking roller in contact with the swing roller and a plate surface. The roller is formed by a roller shaft whose movement in the axial direction is regulated, and a roller body supported movably in the axial direction by the roller shaft. An air chamber closed by a swing width adjusting screw screwed so as to be movable in the axial direction and an end of the roller body is formed, and both air chambers are moved by moving the roller body in the axial direction. An inking device for a printing press, comprising a flow control member that is connected by an air passage whose opening to an air chamber is closed by a swing width adjustment screw and that expands and contracts a cross-sectional area of the air passage.