GB776429A - An automatic screen printing machine - Google Patents

Abstract

776,429. Stencilling-apparatus; feeding and delivering sheets. HAUCK, W. C. Nov. 1, 1955 [Nov. 13, 1954], No. 31147/55. Classes 100(1) and 100(2) An automatic screen-printing machine comprises a flat stencil and a complementary flat bed for supporting material to be printed, which are movable relative tc a squeegee during printing, the stencil on the bed or back being adapted to be moved in a path or paths defined by one or more endless chains or belts. The sheet support bed 1, Fig. 1, and stencil 2 are each coupled at their opposite transverse edges by couplings 10a, 10b, 11a, 11b, to four pairs of endless belts 6c, 4c, 5c, 3c, all of which belts are rotated so that the support and stencil move to the right past a stationary squeegee for printing and are moved a part while remaining horizontal on their return run. Only one of the members need be coupled to a belt, thus in Fig. 8, the bed 1 is so coupled, and is also provided with a lug 34 which reciprocates the stencil 1 along a rail 32 on which it rests on rollers 33a, 33b members 37 being adjustable to vary the height of the stencil. Furthermore, only one edge need be coupled to the belt resulting in a pivotal movement to a sloping position on the return stroke. The bed 1, Fig. 5, is supported by rollers 25, 26 on a rail 23 pivoted at 24, while a coupling 10a connects it to the belt 4c. Alternatively, the bed 1 is secured to a rack 27, Fig. 6a engaging a gear 28. In another form, anextension of the bed 1 carries a roller running on a fixed rail, while the opposite edge is coupled to a belt, which runs over two belt wheels one of which may be longer than the other to produce greater inclination. The belt wheels 6b, 4a, 5b, 3a, Fig. 1, may be mounted on a common shaft. The squeegee can also be adjustable in height. Sheet-forwarders. A sheet 41, Fig. 11, is separated from a pile 42 by a reciprocating fusion roller 46. As the bed 1 moves into its upper run, a suction gripper 43 secured thereto engages the edge of the sheet and pulls it behind the bed on its upper run, the sheet resting on flexible belts 51 weighted at 53, Fig. 12..As the bed moves into its lower run a stationary stop 54 projects between the belts, and on the lower return run engages the sheet and moves it on to the bed. Sheetdelivery. As the bed supporting a sheet 39, Fig. 10, moves on to its lower run, the edge of the sheet is engaged through a slot in the bed by a suction arm 38, which is then swung clockwise to remove the sheet from the bed.