SU449480A3 - Rotary screen printing machine - Google Patents

Description

(54) ROTARY Stencil PRINTING MACHINE

I

This invention relates to a technique for producing printed products using stencil forms.

A rotary screen printing machine is known, comprising a cylindrical screen and a squeegee mounted on a bracket, as well as a mechanism for feeding the material to be printed.

Such devices are inconvenient because uneven nrogib cancer l occurs in them. Therefore it is difficult to print on large format materials.

A distinctive feature of the proposed machine is that the doctor blade is made of metal with a thickness of less than 17 ° of its width, which makes it possible to evenly distribute the pressure in the contact strip and vary the angle from 90 to 3 °. The machine is made easier and tough enough, which makes it possible for the HGHviH format of the traf

FIG. 1 nokaaana proposed stencil machine, cross section; Fig 2 is an embodiment of mechanism 1 of the mode; in fig. 3 - orientation scheme

contact zones; Fig. 2 is a circuit for applying a print of ink to a tape.

The machine includes a controller 1 for vertical movement of the pressing mechanism 2, the pressing mechanism comprises a holder. 3 with clamp 4 fixing the squeegee 5.

. The printing machine also includes an element 6 for nodalisation of the material on which printing is performed. When printing on a sufficiently rigid material, element 6 is a roc. A support belt 7 is used for printing on soft material.

The squeegee 5 is made of a thin metal strip, the thickness of which is less than 1% of its width.

The regulator 1 contains a pneumatic cylinder with which the clamping mechanism 2 can be raised or lowered to adjust the position of the i rac & Assign a gel-cylindrical stencil 8. The down position of the pressing mechanism 2 and, consequently, the angle at which the squeegee 5 is pressed to the stencil, can be changed by adjusting the haikoy 9. The squeegee 5 is fixed by two straps 10 and 11 located on the holder 3 made in the form of a pipe through which paint is supplied i. The rotary lever 12 serves to rotate the holder 3 when, it is necessary to move the contact zone 1.3. The bracket 14 is stirred, the lever 12 can be turned accordingly (acting on the shoulder. As a result, the squeegee 5 can be installed in the desired position. The controller 1 can be rotated relative to the axis of the bracket 16 fixed to the frame (see FIG. 3). The tori 1 interacts with the holder 3 by the clips 17. The clips are located outside the stencil S and are hingedly connected to the pins 18 of the levers 19. The free ends 2 of each lever 19 are fixed to the riders and 21, but can be mixed with the help of nuts 22. Thus, therientatsi contact zones 13. Depending on the orientation of con tact print ink 23 on the tape 24 may be zone coated in various ways. If the contact area is focused {Figure 4), then the imprint is produced partly on the surface, and partially in the thickness of the tape. If it is necessary to obtain an imprint only on the surface of the tape, the contact zone is shifted backwards compared to the position in FIG. 4 Sfig. B) If it is necessary that the paint is fully absorbed into the tape, the contact area is forward {FIG. b). Advantage: the proposed machine is a reduction in the weight of the mechanism of adhesion and effort in it, which allows to reduce the format of the machine without fear of tearing the uneven flexure of the roller, which causes uneven distribution of paint on the print. The friction between the squeegee and the stencil decreases as the squeegee is made of metal; that increases the life of the machine. Metal squeegee allows you to get a different angle between the tangent to the edge of the squeegee and the tangent to the surface of the stencil in the contact zone in the range from 90 to 3 °. The two-point suspension of the RAC reduces the maximal value of the deflection of the rakl compared with the use of the suspension along the entire length of the squeegee. The subject matter of the invention is a rotary screen printing machine containing a material feeding mechanism for printing, a cylindrical stencil squeegee placed inside a cylindrical stencil, a squeeze pressure mechanism to the stencil, which is made from metal, the elastic modulus of which lies in the range of 1 500 000-2 ZOO 000 kg / cm, while the thickness. less than 1% of its width.

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