JPH0976468A - Rocking device of ink transfer roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automate adjustment of contact pressure to a vibrator roller of an ink transfer roller. SOLUTION: A rocking device comprises a rocking axis 4 to be rocked by a cam mechanism, a rocking arm 13 which is freely supported by the rocking axis 4 at its one end and has at its other end an ink transfer roller 3 which is pressed by an urging means 14 so as to be directed in a direction of a doctor roller 1, and a bracket 19 which is fixed to the rocking axis 4 and has a pushing means 23 which pushes the rocking arm 13 by an elastic force stronger than that of the urging means 14 only when the rocking axis 4 is rocked in a direction of a vibrator roller 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inking device for an offset printing machine, and more particularly, to an oscillating device for an ink transfer roller for transferring ink stored in an ink fountain from a doctor roller to a vibrator roller of a kneading roller group.

[0002]

BACKGROUND OF THE INVENTION In an inking unit of an offset printing machine, ink stored in an ink fountain is transferred from a doctor roller to a first vibrator roller of a kneading roller group by an ink transfer roller. Then, while passing through the kneading roller group, the ink is repeatedly split and transferred, kneaded and supplied from the inking roller to the plate surface.

The ink transfer roller, which is intermittently oscillated between the doctor roller and the vibrator roller, has a role of sequentially sending out a fixed amount of ink required for printing. It is necessary that the contact pressure between the transfer roller and the vibrator roller be constant.

However, the diameter of the ink transfer roller changes due to wear over time, and it is necessary to adjust the contact pressure.

[0005]

Japanese Patent Publication No. 7-4931 discloses a means for manually adjusting the contact pressure, but such a manual adjustment has been troublesome.

The present invention has been made in view of the above problems,
An oscillating device for an advanced ink transfer roller is provided, and its purpose is to automate the contact pressure adjustment of the ink transfer roller and make it so-called maintenance-free.

[0007]

To this end, the swinging device of the ink transfer roller according to the present invention has a swinging shaft (4) which is swung by a cam mechanism and one end of which is the swinging shaft (4). ), An ink transfer roller (3) is disposed at the other end, and the ink transfer roller (3) is shaken by the biasing means (14) so as to move toward the doctor roller (1). Moving arm (13) and swing shaft (4)
When the swing shaft (4) is fastened to the vibrator roller (2), the swing arm (13) is pushed with a stronger elastic force than the biasing means (14). A bracket (19) provided with a moving means (23).

[0008]

With the cam mechanism, the swing shaft (4) is alternately swung in the doctor roller (1) direction and the vibrator roller (2) direction, but when it is swung in the doctor roller (1) direction, The pushing means (23) provided on the bracket (19) does not function, and the ink transfer roller (3) is moved to the doctor roller (1) by the elastic force of only the urging means (14).
Contact with.

On the contrary, when the swing shaft (4) is swung in the direction of the vibrator roller (2), the pushing means (23) is provided.
Overcomes the elastic force of the biasing means (14) and pushes the swing arm (13), whereby the ink transfer roller (3) contacts the vibrator roller (2).

The contact pressure at this time is determined by the pushing means (2
It is a value obtained by subtracting the elastic force of the urging means (14) from the elastic force of 3). Since this value can be regarded as constant regardless of the wear of the ink transfer roller (3), it is not necessary to adjust the contact pressure. Become.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic side view showing an embodiment of a rocking device for an ink transfer roller according to the present invention, FIG. 2 is a schematic side view of a cam mechanism for driving a rocking shaft, and FIG. 3 is a cross section of the device of the present invention. FIG.

Between the doctor roller (1) and the vibrator roller (2), between the side wall (5) of the printing machine, a swing shaft (4) serving as a reference shaft when the ink transfer roller (3) is swung and swung. Have been handed over to. The swing shaft (4) is supported by the side wall (5) freely, and by a well-known cam mechanism described below, the clockwise direction (direction of the vibrator roller (2)) and the counterclockwise direction (direction of the vibrator roller (2)) of FIG. It is alternately swung in the direction of the doctor roller (1).

As shown in FIG. 2, a cam plate (6) which is timely rotated by the power of the printer body is rotatably provided outside the side wall (5). 6), a cam follower (9) at one end of a lever (8) having a substantially L-shape that is swung about a pivot (7).
Are in contact. The other end of the lever (8) has a cam spring (10) for pressing the cam follower (9) against the cam plate (6) and also has a roller bearing (11). This roller bearing (11)
Engages the free end of a cam bracket (12), one end of which is fixedly connected to the swing shaft (4).

Therefore, when the cam plate (6) is driven and rotated, a swinging motion of the lever (8) is generated around the pivot (7), and this swinging motion is caused by the cam bracket (1).
It is transmitted from 2) to the swing shaft (4).

Returning to FIG. 1 again, one end of the swing arm (13) is freely supported by the swing shaft (4), and the other end supports the end of the ink transfer roller (3). At the same time, it is biased in the direction of the doctor roller (1) by the biasing means (14).

The urging means (14) includes a spring (1
One end of a guide shaft (16) having 5) is connected to the swing arm (4) by a pin (17), and the other end is inserted into a guide stopper (18). Therefore, the elastic force of the spring (15) constantly urges the swing arm (13) and thus the ink transfer roller (3) in the doctor roller (1) direction (counterclockwise direction in the drawing).

While the swing arm (13) is free with respect to the swing shaft (4), the bracket (19) provided in parallel with the swing arm (13) is attached to the swing shaft (4). It is consolidated and united. A push bolt (21), which is preferably biased by a strong elastic member (20) such as a disc spring, is inserted into the free end of the bracket so as to be movable in the axial direction. A retaining nut (22) is attached to the rear end of the push bolt (21) with a sufficient margin, but the head side can contact or separate from the tip of the swing arm (13). The pushing bolt (21) and the elastic member (20) constitute a pushing means (23).

By the movement of the cam mechanism described above, the swing shaft (4) alternately swings in the clockwise direction (direction of the vibrator roller (2)) and the counterclockwise direction (direction of the doctor roller (1)) in FIG. To be done. Of these, when it is swung in the direction of the doctor roller (1), the push bolt (21) is separated from the swing arm (13), and the elastic force thereof is generated.
Ink transfer roller (13) as it does not work on 3)
Is contacted with the doctor roller (1) by the force of the spring (15) of the biasing means (14) to receive the ink.

On the contrary, when the swing shaft (4) is swung in the direction of the vibrator roller (2), the pushing bolt provided on the bracket (19) integral with the swing shaft (4). (21) contacts the tip of the swing arm (13), and the force of the elastic member (20) overcomes the elastic force of the urging means (14) while pushing and swinging the swing arm (13). Let As a result, the ink transfer roller (3) contacts the vibrator roller (2) and sends the ink to the kneading roller group.

As mentioned above, the contact pressure at this time is
It is a value obtained by subtracting the elastic force of the spring (15) of the urging means (14) from the elastic force of the elastic member (20) of the pushing means (23) and is not affected by the circumstances of the ink transfer roller (3). Since it is constant, there is no need to adjust the contact pressure, and so-called maintenance-free operation is realized.

[0021]

According to the swinging device of the ink transfer roller according to the present invention, the adjustment work of the contact pressure is not necessary and the maintenance is free, which can contribute to the automation and sophistication of the printing machine. .

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of an oscillating device for an ink transfer roller according to the present invention.

FIG. 2 is a schematic side view of a cam mechanism that drives a swing shaft.

FIG. 3 is an explanatory sectional view of the device of the present invention.

[Explanation of symbols]

 1 Doctor Roller 2 Vibrator Roller 3 Ink Transfer Roller 4 Swing Shaft 6 Cam Plate 8 Lever 12 Cam Bracket 13 Swing Arm 14 Biasing Means 15 Spring 19 Bracket 20 Elastic Member 21 Push Bolt 23 Pushing Means

Claims (1)

[Claims] 1. A swing shaft (4) which is swung by a cam mechanism, and one end of which is freely supported by the swing shaft (4),
An ink transfer roller (3) is arranged at the other end, and a swing arm (13) pressed by a biasing means (14) so that the ink transfer roller (3) is directed toward the doctor roller (1), The swing arm is fixed to the swing shaft (4) and has a stronger elastic force than the biasing means (14) only when the swing shaft (4) is swung in the direction of the vibrator roller (2). An ink transfer roller swinging device having a bracket (19) provided with a pushing means (23) for pushing the (13).