Printing screen coating method and apparatus
AssigneeFirma Ernst Harlacher
InventorRudolf Gasser
Life of this patent
Estimating the term…
Abstract
Flat printing screens can be coated on one or both sides by the method and apparatus. A liquid is applied to a screen by one or two squeegees secured to carriages moved up and down on rubber sprocket belts driven by a motor. The speed of application can be adjusted according to the desired thickness of the coating and the viscosity of the liquid. The squeegees are mutually offset somewhat in height to reliably prevent the liquid from running out when the squeegees are not in motion. Application takes place regularly and reproducibly even in the case of a thick coating. The drive by means of rubber sprocket belts and a counterweight ensure vibration-free movement of the squeegees along the screen.
Claims6
Apparatus for coating both sides of a vertically disposed flat printing screen with liquid material, comprising
- means for holding said screen in a vertical plane,
- two horizontally disposed squeegees, both including container means to contain said liquid material,
- drive means for causing said squeegees to move vertically along opposite sides of said screen and to apply said liquid material from each container means to opposite surfaces of said screen, and
- control means for controlling said drive means.
Apparatus for coating both sides of a vertically disposed flat printing screen with liquid material, comprising
- means for holding said screen in a vertical plane,
- two horizontally disposed squeeges, both including container means to contain said liquid material, and both having respective front edges facing said screen, said edges being mutually offset in height in order not to press against one another during operation,
- drive means for causing said squeegees to move vertically along opposite sides of said screen and to apply said liquid material from said container means to opposite surfaces of said screen, and
- control means for controlling said drive means.
Apparatus for coating both sides of a vertically disposed flat printing screen with liquid material, comprising
- means for holding said screen in a vertical plane,
- two horizontally disposed squeegees, both including container means to contain said liquid material,
- a frame including two uprights,
- two carriages vertically displaceable along said two uprights and connected to said squeegees, drive means comprising a motor, a shaft, and at least one sprocket belt for causing said carriages and said squeegees to move vertically along opposite sides of said screen and to apply said liquid material from said container means to opposite surfaces of said screen,
- control means for controlling said drive means, and
- adjustment means affixed to said carriages for adjusting the positions of said squeegees, including
- a vertical upper cylinder having a piston,
- a vertical slide connected to said piston,
- two crossbars connected to said carriages and bearing said squeegees,
- two horizontal slides connected to said levers for moving said squeegees horizontally,
- two tilting arms secured to said squeegees and pivoted on said horizontal slides, and
- two lower cylinders having pistons connected to said tilting arms for pivoting said tilting arms and thereby tilting said squeegees.
Dependencies are inferred from the claim text.