JPH0123826Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an ink supply device for a printing device.
In particular, the present invention relates to an ink supply device used in a single-cylinder stencil printing device.

BACKGROUND TECHNOLOGY As one of the ink supply devices used in a single-cylinder stencil printing device, the ink supply device is disposed on the outer circumferential surface along one generatrix line and in contact with the inner circumferential surface of a cylindrical plate cylinder. A squeegee roller that rotates in synchronization with the rotation of the cylindrical plate cylinder therearound and a predetermined gap between the outer peripheral surface of the squeegee roller and arranged substantially parallel to the axis of the squeegee roller. and a doctor rod, the ink pool is formed in a wedge-shaped space formed between the squeegee roller and the doctor rod, and the printing ink in the ink pool is transferred to the gap as the squeegee roller rotates. The ink supplying device which operates to deposit a layer of a predetermined thickness on the outer circumferential surface of the squeegee roller and transfer it to the inner circumferential surface of the cylindrical plate cylinder is a patent application by the same applicant as the present applicant. Patent Application No. 128043 (1972)
55889) has already been proposed.

In the above-mentioned ink supply device, the contact pressure of the squeegee roller against the cylindrical plate cylinder and the size of the gap between the squeegee roller and the doctor rod determine the ink supply on the printing surface (the outer peripheral surface of the cylindrical plate cylinder). Preferably, the contact pressure and the gap can each be adjusted individually, since this determines the print density. An ink supply device with an adjustment mechanism capable of making these adjustments was disclosed in a patent application filed in 1983 by the same applicant as the present applicant.
This method has already been proposed in No. 13986 (Japanese Unexamined Patent Publication No. 56-64872).

Problems to be Solved by the Invention The above-mentioned ink supply device with an adjustment mechanism achieves the intended purpose, but in this case,
It is difficult to adjust the gap between the squeegee roller and the doctor rod, and the gap cannot be finely adjusted.

The present invention provides an ink supply device for a printing device configured so that the contact pressure of the cylindrical plate cylinder against the squeegee roller and the size of the gap between the squeegee roller and the doctor rod can be individually and finely adjusted with good workability. The purpose is to

Means for Solving the Problems According to the present invention, the above-mentioned object includes a frame body having a pair of side plates parallel to each other, and a pair of squeegee roller supports each pivotally supported by the pair of side plates. The arm is disposed between the squeegee roller support arm and the pair of squeegee roller support arms, and is rotatably supported by the squeegee roller support arm around its own central axis, and extends along one generatrix line on the outer peripheral surface of the cylindrical plate cylinder. a squeegee roller that slides on the peripheral surface; a first adjusting and fixing means that adjustably fixes the squeegee roller support arm to the side plate at a predetermined mounting angle; a pair of doctor rod support plates disposed between the pair of doctor rod support plates, supported by the doctor rod support plates, extending substantially parallel to the axis of the squeegee roller, and connecting with the outer circumferential surface of the squeegee roller; a doctor rod defining a gap therebetween; and second adjusting and fixing means for adjusting and fixing the doctor rod support plate to the squeegee roller support arm at a predetermined mounting angle. This is accomplished by the ink supply of the device.

Effects and Effects of the Invention According to the configuration as described above, the contact pressure of the squeegee roller with respect to the cylindrical plate cylinder is adjusted by adjusting the mounting angle of the squeegee roller support arm with respect to the side plate by the first adjusting and fixing means. Separately, the size of the gap between the squeegee roller and the doctor rod is adjusted by adjusting the angle at which the doctor rod support plate is attached to the squeegee roller support arm by the second adjusting and fixing means. The first and second adjusting and fixing means may be configured to fix them at a position remote from the pivot axis of the squeegee roller support arm or the pivot axis of the doctor rod support plate, respectively, thereby reducing the contact pressure. The size of the gap can be adjusted individually and minutely with good workability.

Since the doctor rod support plate is supported by the squeegee roller support arm and is fixed to the squeegee roller support arm by the second adjustment fixing means, the side plate of the squeegee roller support arm is used to adjust the contact pressure of the squeegee roller against the cylindrical plate cylinder. The clearance of the doctor rod to the squeegee roller does not change even if the mounting angle to the squeegee roller is changed, and vice versa.

Embodiments Hereinafter, the present invention will be described in detail by way of embodiments with reference to the accompanying drawings.

The attached figure shows one embodiment of an ink supply device for a printing device according to the present invention. In the figure, 1
2 shows a frame of the ink supply device, and the frame has a pair of side plates 2 provided parallel to each other. On each side plate 2, a squeegee roller support arm 4 is attached to each side plate 2 by a pivot 3. It is mounted so that it can rotate around it. A squeegee roller 5 is disposed between the pair of side plates 2, and the squeegee roller engages with a squeegee roller support arm 4 at a central shaft 6 provided at both ends of the squeegee roller. It is rotatably supported around the central axis and is in sliding contact with the inner peripheral surface of the cylindrical plate cylinder D along one generatrix.

The squeegee roller support arm 4 has a fork portion 7 at one end, and is engaged with a first eccentric cam 9 fixed to the side plate 2 by a mounting screw 8 at the fork portion. The first eccentric cam 9 fixes the squeegee roller support arm 4 to the side plate 2, and when the mounting screw 8 is loosened, the mounting rotational posture relative to the side plate 2 can be freely adjusted. to pivot the squeegee roller support arm 4
It is adapted to be rotationally displaced relative to the side plate 2 around.

A pivot 3 provided on each of the pair of side plates 2 rotatably supports a doctor rod support plate 10 separately from the squeegee roller support arm 4. A doctor rod 11 made of a round bar member is disposed between the pair of side plates 2, and the doctor rod has a central shaft 12 at both ends thereof, and the central shaft 12 is connected to the side plate 2 and the squeegee roller support arm, respectively. 4, and is rotatably engaged with the doctor rod support plate 10. That is, the doctor rod 11 is supported by the doctor rod support plate 10 so as to be rotatable about its own central axis. Since the elongated holes 2a and 4a are each arc-shaped elongated holes centered on the pivot shaft 3, the doctor rod support plate 10 can be rotated relative to the squeegee roller support arm 4 around the pivot shaft 3 while supporting the doctor rod 11. It is becoming possible to do so. The doctor rod 11 extends substantially parallel to the axis of the squeegee roller 5 and defines a gap 13 between it and the outer peripheral surface of the squeegee roller 5 that extends along one generatrix of the squeegee roller. There is.

The doctor rod support plate 10 has a long hole 14 extending in a direction substantially perpendicular to the extending direction of the long hole 4a at one end, and a squeegee roller support arm is attached to the long hole by a mounting screw 15. A second eccentric cam 16 fixed to 4 is engaged. The second eccentric cam 16 fixes the doctor rod support plate 10 to the squeegee roller support arm 4, and when the mounting screw 15 is loosened, the second eccentric cam 16 can freely rotate and attach to the squeegee roller support arm 4. The doctor rod support plate 1 is adjusted accordingly.
0 is rotatably displaced about the pivot shaft 3 relative to the squeegee roller support arm 4.

A sprocket 17 is attached to the central shaft 6 of the squeegee roller 5, and an endless transmission belt 18 is engaged with the sprocket. The endless transmission belt 18 connects the squeegee roller 4 to the cylindrical plate cylinder D.
The plate cylinder D is rotated in the same direction as the rotation direction of the cylinder D, that is, counterclockwise in the figure, in synchronization with the rotation of the cylindrical plate cylinder D.

An inner case of a one-way clutch 19 is fixedly connected to the central shaft 12 of the doctor rod 11. One end of a cam interlocking lever 20 is fixedly connected to the outer race of the one-way clutch 19. The cam interlocking lever 20 engages with an eccentric cam 22 fixed to the central shaft 6 of the squeegee roller 5 at a fork portion 21 formed at the other end, and rotates around the central shaft 12 by rotation of the eccentric cam 22. It is designed to swing at a predetermined rotation angle. The one-way clutch 19 is adapted to freely allow its outer race to rotate in the counterclockwise direction in the drawings relative to the inner race.

Therefore, only the clockwise rotation of the cam interlocking lever 20, which reciprocates due to the action of the eccentric cam 22 as the squeegee roller 5 rotates, is transmitted to the doctor rod 11 by the one-way clutch 19, and the doctor rod 11 is rotated by the squeegee roller. It rotates intermittently in the rotation direction opposite to the rotation direction 4, that is, in the clockwise direction in the figure.

Squeegee roller 5 from ink supply pipe 23
As the squeegee roller 5 rotates, the printing ink that has been supplied to the top moves toward the wedge-shaped space between the squeegee roller 5 and the doctor rod 11, and fills the ink pool formed in the wedge-shaped space. It is rolled up into the ink mass to form a fluid ink mass. The printing ink in this ink pool P passes through the gap 13 as the squeegee roller 5 rotates, and adheres to the outer circumferential surface of the squeegee roller 5 in a layer with a thickness determined by the size of the gap, and forms a layer on the cylindrical plate cylinder D. Sent to the inner peripheral surface.

In the above configuration, the squeegee roller 5
The contact pressure with respect to the cylindrical plate cylinder D is adjusted by adjusting the rotational attitude of the first eccentric cam 9 when attached to the side plate 2. By changing the mounting rotational posture of the first eccentric cam 9 with respect to the side plate 2, the squeegee roller support arm 4 rotates around the pivot shaft 3, and as a result, the squeegee roller 5 rotates with respect to the cylindrical plate cylinder D. The installation position changes. That is, as the squeegee roller support arm 4 rotates clockwise in the figure around the pivot shaft 3, the contact pressure of the squeegee roller 5 against the cylindrical plate cylinder D increases, and in contrast, the squeegee roller The contact pressure of the squeegee roller 5 against the cylindrical plate cylinder D decreases as the roller support arm 4 rotates counterclockwise in the figure about the pivot shaft 3.

The size of the gap 13 can be adjusted by rotating the doctor rod support plate 10 around the pivot shaft 3 with respect to the squeegee roller support arm 4 by adjusting the rotational attitude of the second eccentric cam 16 relative to the squeegee roller support arm 4. It will be done. That is, by rotationally displacing the doctor rod support plate 10 relative to the squeegee roller support arm 4 around the pivot shaft 3 in the clockwise direction in the figure, the gap 13 is reduced; In response to rotational displacement of the support arm 4 around the pivot 3 in the counterclockwise direction in the figure, the gap 1 is
3 increases.

In this embodiment, the doctor rod support plate 10 is supported by the side plate 2 along with the squeegee roller support arm 4 by the pivot 3;
The doctor rod support plate 10 only needs to be supported by the squeegee roller support arm 14 in order to follow the rotation of the doctor rod 4, and the doctor rod support plate 10 is attached to the squeegee roller support arm 1 by a different pivot at a position different from the pivot 3.
4 may be supported.

Since both the contact pressure and the gap size are adjusted by eccentric cams, delicate adjustments can be made reliably with good workability.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

The attached figure is a front view showing one embodiment of an ink supply device for a printing apparatus according to the present invention. ... Frame body, 2 ... Side plate, 3 ... Pivot, 4 ... Squeegee roller support arm, 5 ... Squeegee roller, 6 ... Center shaft, 7 ... Fork part, 8 ...
Mounting screw, 9... First eccentric cam, 10... Doctor rod support plate, 11... Doctor rod, 12...
Central axis, 13... Gap, 14... Long hole, 15...
Mounting screw, 16...Second eccentric cam, 17...Sprocket, 18...Endless transmission belt, 19...One-way clutch, 20...Cam interlocking lever, 2
1...Fork part, 22... Eccentric cam, 23...
Ink supply pipe.

Claims (1)

[Scope of utility model registration request] a frame body including a pair of side plates parallel to each other; a pair of squeegee roller support arms each pivoted to the pair of side plates; and a frame body disposed between the pair of squeegee roller support arms to support the squeegee roller. a squeegee roller that is rotatably supported around its own central axis by an arm and whose outer circumferential surface is in sliding contact with the inner circumferential surface of the cylindrical plate cylinder along one generatrix; a first adjusting and fixing means fixed to the side plate at a mounting angle; a pair of doctor rod support plates each pivotally supported by the pair of squeegee roller support arms; and a first adjustment fixing means disposed between the pair of doctor rod support plates. a doctor rod supported by the doctor rod support plate, extending substantially parallel to the axis of the squeegee roller and defining a gap between the doctor rod support plate and the outer peripheral surface of the squeegee roller; an ink supply device for a printing device, comprising a second adjusting and fixing means for fixing to the squeegee roller support arm at an attachment angle.