GB179372A - Improvements in or relating to sheet-delivery mechanism of printing machines - Google Patents

Abstract

179,372. Linotype & Machinery, Ltd., and Spence, F. March 9, 1921. Delivery apparatus.- Relates to sheetdelivery mechanism for printing - machines of the kind comprising a number of bars supported by a reciprocating carriage, which bars during the inward travel of the carriage pass between the delivery tapes and during the outward travel receive a sheet from the tapes, the sheet being swept off the bars on to the delivery board during the next inward travel of the carriage by the action of pivoted fingers lifted to engage the inner edge of the sheet and subsequently lowered out of the way of the carriage during its next outward travel, and consists in the combination of sheet-pusher fingers adapted to swing about an horizontal axis and an oscillating slotted arm for imparting said swinging motion, characterized by the fact that the slot in the oscillating arm is non-radial to the axis about which it oscillates, positive stops acting on the fingers being dispensed with so as to minimize trouble from accidental breaking of the fingers. As shown, the bars are supported by the reciprocating carriage 3 and pass on the inward travel of the latter between the tapes 5 and tape rollers 6. The fingers 8 are secured to a rock-shaft 9 mounted in brackets 10 adjustable along rods 11 at opposite sides of the machine, and are rocked by means of an arm 14 secured to the shaft 9 and formed with a non-radial slot 15 engaged by a stud 16 on one arm 17 of a bell-crank lever. Carried by the other arm 18 of the lever is a swivelling block 19 clamped by a screw 21 to a rod 20 connected to a pivoted lever 22 adapted to be actuated by a roller 24 on the carriage 3 when the latter reaches the limit of its outward travel, whereby the fingers 8 are raised, as shown in Fig. 2, in readiness to sweep off the sheet lying on the bars 1 when the carriage travels inward again. Another lever 26, pivoted at 25 and having a projection 27 resting on the arm 17 of the bell-crank, is raised at the same time as the fingers 8 are lifted and takes up a position in the path of the roller 24 so that by the time the sheet has been swept off the bars 1 and on the further inward movement of the carriage 3, the roller 24 engages the lever 26, thereby lowering the fingers 8 into the prone position. A rod 28 is pivoted to the rocking- arm 14 and passes through the slotted swivelling pivot 25 of the lever 26, and is encircled by a coil spring acting between the shoulder 30 and the pivot 25 to retain the fingers 8 in their terminal positions. The arrangement of the stud 16 and slot 15 may be reversed, the former being carried on the rocking-arm 14 and the latter provided in the arm 17 of the bell-crank.