Apparatus for making stencils for use in screen printing machines

摘要

Apparatus for making stencils of the type having a rectangular frame and a woven fabric stretched upon and affixed to the frame for use in a screen printing machine has a table which supports four rows of neighboring fabric stretching devices surrounding a rectangular portion of the upper side of the table. Each stretching device has a support the underside of which abuts the upper side of the table, and a double-acting hydraulic or pneumatic cylinder and piston unit pivoted to the support and having a piston rod extendable toward and retractable away from the frame at the rectangular portion of the upper side of the table. The free end of each piston rod carries tongs having a pair of fabric-engaging jaws which stretch the fabric during retraction of the respective piston rod.