JPH0286447A - Rotary screen printer - Google Patents

Abstract

PURPOSE:To make possible the formation of a cylindrical original plate on a screen by forming a directly photosensitive synthetic resin layer on the screen provided tensely in a cylindrical form by right and left circular drum. CONSTITUTION:A photosensitive synthetic resin layer is formed on the surface of a screen 3 coiled cylindrically by using a pair of right and left circular drums 2, 2 which rotate synchronously. Characters and patterns to be printed are printed on the photosensitive resin layer by exposing a negative plate to light. After this, the unexposed part of the resin layer is removed by cleaning to form a stencil plate (original plate). The drums 2, 2 with this original plate are rotated on printing paper, and at the same time, ink is supplied to the inner peripheral surface of the screen 3 from inside the drums 2, 2 using a feeder plate 4 to print the printing paper.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention involves wrapping a screen in a cylindrical shape, forming a photosensitive synthetic resin layer on the screen, and applying a negative pattern to the screen.
This invention relates to a new type of rotary screen printing machine that prints the print, then washes the synthetic resin layer to form a stencil, and prints using this stencil as an original.

<Prior Art> In conventional screen printing machines, all the screens are formed flat by being stretched under tension on a rectangular frame. A photosensitive synthetic resin layer is then formed on this flat screen through means such as coating, and a negative copy of the print or pattern to be printed is exposed and printed on this, and then the unexposed areas are washed. is removed to form a stencil, and this stencil is used as an original for printing.

<Problems to be Solved by the Invention> Therefore, in conventional screen printing machines, printing speed is limited because the original plate is placed on a flat surface, and high-speed printing such as rotary printing is difficult. The major drawback is that it cannot be done.

Therefore, the main object of the present invention is to provide a rotary screen printing machine that solves the above-mentioned conventional problems by incorporating a new method not previously available in the field of screen printing.

Means for Solving the Problems In order to achieve the above object, the present invention provides a pair of left and right circles rotatably supported by a shaft l at an appropriate interval and interlocked to rotate synchronously. Drum 2.2 and
A fine mesh screen 3 is stretched in a cylindrical shape along the outer circumferential surface of the left and right circular drums 2.2, and a supply plate 4 supplies ink from the inside of the drum to the inner circumferential surface of the screen 3. and the drum 2
．． and a drive mechanism for rotating the circular drum 2.2, and the circular drum 2.2 is formed so that it can be moved in a direction that moves away from each other and can be fixed at a desired position,
Further, a photosensitive synthetic resin layer for forming an original is formed on the surface of the screen 3.

In the above structure, a photosensitive synthetic resin layer is formed by means such as coating on the surface of the screen 3 which is wound into a cylindrical shape by the left and right drums 2.2, and the prints to be printed thereon are formed. After exposing and printing a negative on which a pattern has been copied, it is washed and the unexposed areas are removed to form a stencil, and this stencil is used as an original for printing.

<Example> The present invention will be described in detail below with reference to the drawings.

In the figure, reference numeral 2.2 denotes a pair of left and right circular drums 2.2 supported at an appropriate distance from the shaft l, and a sleeve 5 supported on the shaft l so as to be slidable in the axial direction. is rotatably held. Further, the left and right drums 2.2 are provided with a synchronizer H so that they rotate simultaneously.
They are interlocked and connected via 4A. In the embodiment shown in the figure, the interlocking mechanism B is constructed as follows. That is, a shaft 7 is supported by a pillar 6.6 fixed to the shaft 1, and a gear 8.8 fixed to both ends of the shaft 7 is formed by meshing with a gear 9 formed on the inner surface of the circular drum 2.2. As a result, the left and right drums 2.2 are configured to rotate in synchronization.

Reference numeral 3 denotes a fine mesh screen which is stretched in a cylindrical shape along the outer peripheral surface of the left and right circular drums 2.2, and the material of this screen is not compatible with conventional screen printing machines. Substantially the same material as the screen used. The tension of the screen 3 in the left-right direction (in the axial direction of the shaft 1) is maintained by tightening a nut member 10 screwed onto the shaft 1 inside the drum. By screwing this nut member IO outward, the sleeve 5 is moved outward together with the drum 2, thereby maintaining the tension of the screen 3 in the left-right direction. In addition, the tension in the circumferential direction of the screen 3 can be maintained by an appropriate means, for example, when it is attached to the drum 2.2, it is tensioned using a suitable jig and the joints are connected by means such as soldering or adhesive tape. Bye.

A supply plate 4 that supplies ink from inside the drum to the inner peripheral surface of the screen 3 is fixed to the shaft i. The tip portion 4a of the supply plate 4 is made of a relatively flexible material, such as rubber, and is configured to contact the screen 3 with a soft touch. The ink supply passage 1 penetrates through the center of the shaft 72.
Ink is supplied from 1 to an ink reservoir 13 at the tip of the plate 4 through an oversized portion 12 formed in the plate 4. Further, the ink supply passage 11 is connected to an ink tank T via a pipe 14 and a pump P.

Furthermore, the circular drum 2 is connected via gears 15, 16 and appropriate transmissions to a motor (not shown), which makes it possible to drive the drum in rotation during printing.

Also, in the embodiment shown in the figure, a shaft supporting the drum 2.2! A sleeve 5 is formed so that it can be attached to and detached from the pillar 17, so that the drum can be removed from the printing machine together with the screen 3 stretched around the drum circumference, and the stencil forming operation using photosensitive synthetic resin can be carried out at a separate location. However, it is of course possible to carry out the stencil forming work without necessarily removing the drum while it is still set in the printing press.

Note that the means for synchronously rotating the left and right drums 2.2 is not limited to the above-mentioned embodiment; for example, as shown in FIG. .19 respectively gear 20.20.21.2
1 may be connected to a drive shaft 22 directly connected to the motor M.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structure of the above-described embodiments. , it can be implemented with appropriate changes within the scope of achieving the effects described below.

<Effects of the Invention> Since the present invention is configured as described above, a photosensitive synthetic resin layer is directly formed on the screen 3 which is cylindrically stretched by the left and right circular drums 2.2. In exposure printing, a cylindrical original plate can be formed on a screen by washing the negative, and by rotating the drum to which this original plate is attached over the printing paper, ink is supplied from the ink supply plate 4 inside the drum. Since the left and right drums 2.2 are configured to rotate synchronously when the drums rotate, twisting and distortion phenomena occur in the screen and the thin original formed integrally with the screen. This has remarkable effects such as enabling continuous high-speed printing by rotary printing, which was not possible with conventional screen printing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing one embodiment of the present invention; Figure 2 is a longitudinal sectional view of Figure 1; FIG. 3 is a sectional view showing another embodiment. 1 is the shaft, 2.2 is a circular drum, is the screen, 4 is the ink supply plate Ru.

Claims (2)

[Claims] (1) A pair of left and right circular drums 2, 2 rotatably supported by the shaft 1 at an appropriate interval and interlocked to rotate synchronously, and these left and right circular drums 2, 2.
A fine mesh screen 3 stretched in a cylindrical shape along the outer peripheral surface of the circular drum, a supply plate 4 that supplies ink from the inside of the drum to the inner peripheral surface of the screen 3, and the drums 2, 2. The circular drums 2, 2 are formed so that they can be moved in directions away from each other and can be fixed at a desired position, and a stencil is formed on the surface of the screen 3. For forming a photosensitive synthetic resin layer for formation,
rotary screen printing machine (2) The rotary screen printing machine according to claim 1, wherein the circular drums 2, 2 and the shaft 1 together with the screen 3 stretched over the surface of the circular drums 2, 2 are configured to be detachable from the printing machine.