JPH05162290A - Ink feeder of printer - Google Patents

Abstract

PURPOSE:To achieve relaxation of impact force when an ink inductor comes in contact with an ink distributing roller. CONSTITUTION:An ink inductor 1 between an ink fountain roller 3 and an ink distributing roller 2 is arranged, in a freely reciprocative manner, in a roller shaft direction by an angle theta to the roller shaft direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply device for a printing press using an ink fountain system.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a roller arrangement of a printing machine, and FIG. 5 shows an enlarged view of an ink feeding roller portion. As shown in FIG. 4, in the printing machine, the ink is transferred from the ink source roller 3 to the kneading roller 2 by the intermittent operation of the ink feeding roller 1, and the kneading roller 22 thins the ink and transfers it to the plate cylinder 8. On the other hand, the non-image area of the plate on the plate cylinder 8 (the part where ink does not adhere)
Water is supplied from the dampening roller group 7 to the plate cylinder 8. A pattern is formed on the plate cylinder 8 by the ink and water, the pattern is offset to the rubber bracket cylinder 9, and further transferred onto the paper surface to complete printing.

The ink feeding roller 1 is an ink source roller 3
This is a roller for supplying ink from the kneading roller 2 to the kneading roller 2. However, since the difference in the number of rotations between the ink source roller 3 and the ink kneading roller 2 is large, as shown in FIG.
Intermittently through the bracket 55, the ink source roller 3
The ink is transferred to the kneading roller 2 to transfer the ink. This intermittent contact speed operates following the printing speed of the printing machine. As the ink feeding roller 1, a roller whose outer surface is covered with rubber is generally used.

[0004]

Ink feeding roller 1
At the time of contact with the ink kneading roller 2 during the intermittent reciprocating motion, the ink feeding roller 1 is restrained from rotating by the slow-rotating ink source roller 3, and a considerable impact force is applied to obtain a constant pressing pressure. Accompany. This impact force is transmitted through the kneading roller group 22 and reaches the plate cylinder 8 and the blanket cylinder 9 which are the printing units. As a result, the amount of ink transferred to the printing paper differs, which appears as a printing obstacle. The magnitude of the impact force increases in proportion to the printing speed. The present invention provides a means for reducing this impact force and aims to eliminate printing defects.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to the embodiments. The present invention is based on an ink source roller 3 and an ink kneading roller 2. Ink feeding roller 1 disposed between and
Is disposed so as to be reciprocally movable in the roller axis direction at a predetermined angle θ with respect to the roller axis direction.

[0006]

The ink feeding roller of the present invention is incorporated in a rail on a base, and slides on the rail by a reciprocating mechanism. This rail has an angle with respect to each roller axial direction, and by sliding, the rollers contacting the calling roller are alternately changed.

Since the reciprocating motion is converted from the rotary motion so as to draw a sine curve, the shock can be mitigated unlike the pendulum motion. Conventional clearance between rollers is 5-10m
Although there is a m, this is related to the lift amount of the spring and the solenoid (electromagnet) involved in the pendulum motion and could not be made too small. The moving speed can be reduced.

[0008]

1 and 2 show one embodiment of the present invention. The ink feeding roller 1 together with the support base 4 is incorporated in a rail provided on the base 44. The ink feeding roller 1 is installed at the same level as and parallel to the central positions of the ink source roller 3 and the kneading roller 2.

On the other hand, since the rail of the pedestal 44 is displaced from each roller by an angle of θ in the figure, when the support base 4 of the ink feeding roller 1 slides on the rail, the rail of the pedestal 44 is kept parallel to each roller in the figure. If it moves only by that amount, it will separate from the kneading roller 2 and come into contact with the ink source roller 3. The slide amount 1 is determined by the gap between the ink source roller 3 and the kneading roller 2 and the rail angle θ of the pedestal 44.

When the rail angle θ is as small as possible, the moving speed of the calling roller can be made small, so that the impact force at the time of contacting both rollers becomes small. In the embodiment, the moving distance l≈30 mm, the ink source roller 3 and the calling roller 1
The rail angle θ was determined so that the gap between and was 2 mm. Further, the reciprocating motion of the calling roller 1 was connected to the support base 4 by using a general method such as an oscillating roller used in a printing machine for converting the rotational motion of the ink roller.

FIG. 3 shows the operating state of the calling roller 1 in this embodiment in comparison with the conventional example. Each of the rollers comes into contact with the ink source roller 3 and the kneading roller 2 alternately every one rotation of the plate cylinder. It will be understood that in this embodiment, since the gap between the original roller and the kneading roller can be reduced, the contact speed with the other roller is reduced.

Moreover, since the motion process is always in the "moving" state, it is possible to prevent the bouncing phenomenon caused by the impact at the time of contact which has been conventionally generated. As described above, according to the present invention, it is possible to greatly reduce the impact force at the time of contact with the roller and prevent printing trouble.

[0013]

As described above, according to the present invention, by changing the ink displacing roller from the conventional pendulum motion to the reciprocating motion, the impact force at the time of contact with the ink source roller and the kneading roller can be greatly reduced, and the printing failure is caused. This has the effect of preventing the occurrence of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is an operation state diagram of a calling roller.

FIG. 4 is a side view of a conventional roller arrangement.

FIG. 5 is a cross-sectional view of a conventional ink feeding roller.

[Explanation of symbols]

 1 Ink feeding roller 2 Ink kneading roller 3 Ink source roller

Claims (1)

[Claims] 1. An ink take-up roller provided between an ink source roller and an ink kneading roller is provided so as to be reciprocally movable in the roller axial direction at a predetermined angle with respect to the roller axial direction. Ink supply device for printing machines.