JPS6135957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing device, and particularly to a single-cylinder type printing device having a printing ink supply roller that contacts the inner peripheral surface of a cylindrical plate cylinder and supplies printing ink to the plate cylinder. It relates to a printing ink supply roller support device in a printing device.

As a stencil printing device or a textile printing device, there is an ink-permeable cylindrical printing cylinder that is supplied with printing ink on its inner circumference and rotates around its central axis, and an inner circumferential surface of the cylindrical printing cylinder on its outer circumferential surface. Printing devices are known from the prior art having a printing ink supply roller arranged in contact with a printing ink supply roller and rotating about its central axis.

In such a printing device as described above, the printing ink is brought to the contact area between the printing ink supply roller and the cylindrical plate cylinder by the rotation of the printing ink supply roller, where it is transferred to the inner peripheral surface of the cylindrical plate cylinder. The contact pressure of the printing ink supply roller against the plate cylinder affects printing density, and in order to obtain printed matter with appropriate printing density, the contact pressure must be set to an appropriate value in advance. The appropriate value of this contact pressure varies depending on the structure of the wall of the plate cylinder, the thickness of the base paper film, the viscosity of the printing ink, the difference in color of the printing ink, the printing speed, the ambient temperature, etc. Therefore, when installing a new plate cylinder into a printing device, it is necessary to take into account the type of base paper and printing ink used, as well as to deal with manufacturing irregularities in the plate cylinder, and to set the above-mentioned contact pressure to an appropriate value. have to adjust. Furthermore, even when printing is performed using the same printing cylinder and the same printing ink, if the surrounding temperature differs greatly, the viscosity of the printing ink will differ, and the above-mentioned appropriate value will also differ, so it is necessary to change the above-mentioned contact pressure. Become.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing ink supply roller support device configured to easily and reliably adjust the contact pressure of the printing ink supply roller against the plate cylinder.

According to the present invention, an ink-permeable cylindrical plate cylinder whose inner periphery is supplied with printing ink and rotates around its own central axis, and an outer periphery of which the inner periphery of the cylindrical plate cylinder is supplied with printing ink. A printing ink supply roller support device in a printing device having a printing ink supply roller arranged to be in contact with a surface and rotating around its own central axis, which rotatably supports the cylindrical plate cylinder. a support suspended by a shaft; a lever pivotally supported at one end by the support and rotatably supporting the printing ink supply roller at an intermediate portion;
a cam adjustably mounted on the support, the cam engaging the other end of the lever to rotate the lever in a direction in which the printing ink supply roller is moved away from the cylindrical plate cylinder. This is achieved by means of a printing ink supply roller support device characterized in that it is adapted to prevent.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The figure is a side view showing the main parts of one embodiment of a printing device equipped with a printing ink supply roller support device according to the present invention. The printing device has a cylindrical plate cylinder 1 having a predetermined width. Cylindrical plate cylinder 1
has a porous structure that allows printing ink to pass through. The cylindrical plate cylinder 1 is rotated counterclockwise around its central axis 2 by an electric motor, not shown. A stencil paper 3 is attached to the outer peripheral surface of the cylindrical plate cylinder 1. The stencil paper 3 is held in close contact with the outer peripheral surface of the cylindrical plate cylinder 1 due to the viscosity of the printing ink, and rotates integrally with the cylindrical plate cylinder 1.

The central shaft 2 supports a support 4 in a suspended manner within the cylindrical plate cylinder 1. The support body 4 rotatably supports one end of a lever 6 via a shaft 5, and the lever 6 rotatably supports a printing ink supply roller 8 via a shaft 7 at its intermediate portion. The printing ink supply roller 8 contacts the inner circumferential surface of the cylindrical plate cylinder 1 with its outer circumferential surface, and rotates counterclockwise around the shaft 7 as the cylindrical plate cylinder 1 rotates. It's becoming like that.

A cylindrical eccentric cam 10 is attached to the support body 4 by screws 9. The eccentric cam 10 engages the lever 6 with a part of its outer peripheral surface, and prevents the lever from rotating in the direction in which the printing ink supply roller 8 is separated from the cylindrical plate cylinder 1.
It acts to press the plate cylinder against the inner circumferential surface of the plate cylinder.
The eccentric cam 10 is fixed at an arbitrary rotational position by a screw 9, and by adjusting the fixed position, the pressing force (contact pressure) of the printing ink supply roller 8 against the plate cylinder is adjusted. There is.

Further, the support body 4 has a long hole 11 and a squeegee element 1.
It supports mounting pins 13 provided at both ends of 2. The squeegee element 12 is constituted by a round bar member. Squeegee element 12 is attached to mounting pin 1
A compressed coil spring 15 provided between the mounting pin 13 and the shaft 7 surrounds a threaded rod 14 with a head that passes through the shaft 3 and is screwed to the shaft 7. strongly encouraged,
A predetermined small gap is defined between the printing ink supply roller 8 and the outer peripheral surface of the printing ink supply roller 8. Squeegee element 12
In the figure, a printing ink supply pipe 16 is provided on the right side, and the printing ink supplied from this printing ink supply pipe 16 is applied to the outer peripheral surface of the printing ink supply roller 8 and the squeegee element 1 as the printing ink supply roller 8 rotates.
An ink reservoir is formed in a wedge-shaped space defined by the outer circumferential surface of 2.

Further, the support body 4 includes a mounting member 1 including a spring piece portion 18.
7 supports the ink scraping piece 19.

The printing ink supply roller 8, the lever 6, the eccentric cam 10, the squeegee element 12, etc. are supported on the support 4, and when the support 4 is pulled out along the axial direction of the shaft 2, all of them are pulled out and made into a unit. ing.

Further, the outer circumferential portion of the cylindrical plate cylinder 1 is provided with a
A press roller 20 facing the printing ink supply roller 8 across from the printing ink supply roller 8 is rotatably provided by a shaft 21 .

The printing ink in the ink reservoir is transferred to the cylindrical plate cylinder 1.
As the printing ink supply roller 8 rotates in the counterclockwise direction as seen in the figure, printing is carried out through the gap between the printing ink supply roller 8 and the squeegee element 12. The ink layer is uniformly applied to the outer circumferential surface of the ink supply roller 8, and is transferred to the contact area between the cylindrical plate cylinder 1 and the printing ink supply roller 8, and is transferred to the inner surface of the cylindrical plate cylinder 1 in the contact area. It adheres to the circumferential surface and is further pressed by the printing ink supply roller 8 into the cylindrical plate cylinder 1 . This printing ink passes through the plate cylinder 1 and is applied to the back side of the stencil paper 3, further passes through the perforations of the stencil paper 3, and is pressed against the surface of the stencil paper 3 by the press roller 20. The process moves to a piece of printing paper that has not yet been printed, and forms a printed image on that paper.

The printing density in the above printing is determined by the size of the gap between the printing ink supply roller 8 and the squeegee element, the rotation speed of the cylindrical plate cylinder 1, the pressing force of the press roller 20, and the printing ink supply roller 8. It is determined by the contact pressure with the cylindrical plate cylinder 1. The higher the contact pressure, the higher the printing density. Therefore, if it is desired to increase the print density, the eccentric cam 10 may be rotated eccentrically to push down the lever 6 more forcefully. This increases the contact pressure between the printing ink supply roller 8 and the cylindrical plate cylinder 1, thereby increasing the printing density.

In the above embodiment, an eccentric cam is used, but the cam that controls the rotation of the lever 6 may be a wedge-shaped plate cam or the like.

[Brief explanation of the drawing]

The figure is a side view showing the main parts of one embodiment of a printing device equipped with a roller support device according to the present invention. 1 - cylindrical plate cylinder, 2 - central shaft, 3 - stencil paper,
4-support body, 5-shaft, 6-lever, 7-shaft, 8-
Printing ink supply roller, 9 - screw, 10 - eccentric cam, 11 - long hole, 12 - squeegee element, 13 -
Mounting pin, 14 - threaded rod, 15 - compression coil spring, 16 - ink supply pipe, 17 - mounting member,
18 - spring piece, 19 - scraping piece, 20 - press roller, 21 - shaft.

Claims (1)

[Claims] 1. An ink-permeable cylindrical plate cylinder whose inner periphery is supplied with printing ink and rotates around its own central axis; A printing ink supply roller support device in a printing device having a printing ink supply roller rotating around a central axis, the support being suspended by a shaft that rotatably supports the cylindrical plate cylinder. a lever that is pivotally supported at one end by the support and rotatably supports the printing ink supply roller at an intermediate portion; and a cam adjustably attached to the support; A printing ink supply roller support device, wherein the printing ink supply roller support device is adapted to engage with the other end of the lever to prevent rotation of the lever in a direction in which the printing ink supply roller moves away from the cylindrical plate cylinder. .