DE2262081A1 - DEVICE FOR INKING OR PRINTING TRACKS - Google Patents

Description

The invention relates to a device for dyeing or printing webs of material, preferably pile fabric, on stencil printing machines, in particular rotary stencil printing machines, with a
the side of the stencil facing away from the web to be printed on,

When dyeing or printing pile goods, for example so-called Tufted carpets, on rotary stencil printing machines it is necessary to transfer large amounts of dye through the openings of the screen cylinder to be applied to the web in order to achieve perfect coloring and print quality. There are known doctor devices in which the Dye through the stencil openings with the help of voniloll or doctor blades is pressed through. The paint mass is brought by means of a paint tube or the like in front of the roller or doctor blade, where it e.g. creates a paint sump forms or in a bottomless trough, the so-called paint tray, which is sealed against the stencil wall and a squeegee element is arranged inside it is kept in stock.

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In all these squeegee devices, it is difficult to actually hindurchzupressen the required amount of dye through the screen cylinder, ^§ furthermore can be the inking only within certain limits control, for example by changing the peripheral speed of the roller blade, or by adjusting the angular position of the doctor blade. In addition, the contact pressure between the squeegee element and the round stencil, which is necessary with these squeegee devices, results in a penetration-damaging effect on the web in the area of the paint application.

The object of the present invention is a squeegee device with the aid of which a sufficiently strong and also meterable application of paint can be applied the web, preferably on pile fabric, can be achieved without hindering penetration.

According to the invention this is achieved in that the paint tray al $ against the screen cylinder open and sealed, otherwise on all sides closed hollow body is formed in which a liquid pressure is maintained in the preferably low-viscosity paint mass by hydrostatic means.

The application of paint can be mainly done by enlarging or control reduction in hydraulic pressure.

The invention is explained with the aid of a schematic drawing, without being restricted to this example.

The paint pan consists of a hollow body 1 and the elastic lips 2, 3, which are in close contact with the circular blade 4. Particularly useful it is when the ends of the sealing lips rest against the screen cylinder with a slight pre-tension. Below the round template 4 is the to printed web 5, the printing blanket 6 and electromagnets 7. The sealing lips 2, 3 are firmly attached by round rods 8 made of magnetizable material the template wall 4 pressed on. These round bars 8 are with the sealing lips 2, 3 are not firmly connected, but just lie loosely on these lips 2, 3. So that the round bars 8 their functional location in the radial direction can not leave, they are held loosely by retaining plates 9. The retaining plates 9 are spaced apart from one another in the longitudinal direction of the hollow body 1 arranged and are according to an inventive feature as spring elements designed so that they also use the round rods for magnetic pressure 8 press down on the sealing lips 2, 3. The entire hollow body 1 is

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filled with preferably low-viscosity paint 10, but only in the area that is released by the sealing lips 2, 3 with respect to the round template 4, into the area under the round template 4 Web 5 can penetrate. The pressure within the paint mass becomes hydrostatic generated, and corresponds at the point 11 to the height difference 12 to the mirror 13 of a raised paint vessel 14. This mirror 13 is scanned via an air jet nozzle 15, the control pulses of which fed to a controller 17 via a pulse line 16 and from here via a command line 18 passed on to the paint pump 19 or the paint pump motor will. When the level 13 falls, dye is accordingly transferred via the line 20 from the ink reservoir 21 into the superscript Paint vessel 14 is pumped and when the intended level 13 is exceeded this pumping process is interrupted. Via the pipeline 22 then flows from Color vessel 14 of the dye in the hollow body!. Suitably several Pipes 22 are provided, the junctions of which are uniform over the length of the paint tray are distributed in order to make differences even when handling wide webs of material, which can be several meters in the case of so-called tufted carpets, for example in the paint application due to uneven pressure distribution in the paint tray.

When the printing machine is shut down, the ink mass 10 is sucked out of the ink pan via a suction pipe 23 and at the same time, e.g. electromagnetically actuated valve 24 in the pipeline 22 closed.

The device according to the invention is based on the example shown, when printing on rotary stencil printing machines, by no means limited, it can also be used, for example, with carpet flat printing machines will. The ink pan can also be open at the top, the achievable hydrostatic pressure being limited by the overall height of the ink pan.

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309828/0737

BAO ORIGINAL

Claims (10)

2267081 Claims I.) Device for dyeing or printing webs of material, preferably pile fabric, on stencil printing machines, in particular rotary stencil printing machines, with an ink pan arranged on the side of the stencil facing away from the web to be printed, characterized in that the ink pan is an open and sealed against the screen cylinder, Hollow body (1) which is otherwise closed on all sides is formed, in which a liquid pressure in the preferably low-viscosity paint mass (10) is maintained by hydrostatic means. 2. Apparatus according to claim 1, characterized in that the paint trough (1) is connected by at least one pipe (22) to a high-lying paint vessel (14) which is regulated in its color level. 3. Device according to claim 1, characterized g e characterizing t, that for sealing between the paint tray (1) and Siebschablorie (4) sealing elements, for example sealing lips (2, 3) are installed, which by the interaction of magnetic, mechanical and elastic of by Deformation of the sealing elements itself caused forces are pressed against the stencil wall. 4. Apparatus according to claim 3, characterized labeled in such eichnet that are provided for sealing the ink tray towards the screen cylinder flexible sealing lips (2, 3). 5. Apparatus according to claim 4, characterized in that the free ends of the sealing lips (2, 3) rest resiliently on the screen template /. -S- 309828/0737 6. Vorrichtunq according to claim 2, characterized in that at least one air jet nozzle (15) is installed to regulate the color level (13) in the paint vessel (14). 7. Device according to one of claims 3 to 5, characterized in that on each of the two sealing lips (2, 3) in its position to the sealing lip with radial clearance held rod (28) made of magnetizable material rests loosely, which together with an existing one magnetic pressing device (7) presses the sealing lip (2, 3) against the screen cylinder (4). 8. The device according to claim 2, characterized in that there are several pipelines, the junctions of which are distributed evenly in the paint tray over the length of the paint tray. 9. The device according to claim 1, d a by g ekennzei chnet that a suction tube (23) is built into the paint tray. 10. Vorrichtunq according to one of the preceding claims, characterized by the fact that the retaining plates (3), which loosely hold the round rods (8) belonging to the magnetic contact pressure in their position, are designed as spring elements. 309828/0737 L e r s e i t e