GB456641A - Improvements in control devices for printing machines - Google Patents

Abstract

456,641. Printing - machines; feeding sheets. DRESDEN - LEIPZIGER SCHNELLPRESSEN-FABRIK AKT.-GES., Coswig, near Dresden, Germany. May 22, 1936, No. 14527. Convention date, Aug. 17, 1935. [Classes 100 (i) and 100 (ii)] In a printing-machine a feeler device is provided which acts in conjunction with a common driving-member, e.g. a rod 9 which is raised by an oscillating lever 5 to operate the front stops 22, a pivoted cam 47 which allows the grippers 59 to close on the sheet, and also to raise the feeler members 26 and a sheet-guiding or smoothing device 39. If the rod 9 is not raised a chain 17 is operated to throw-off the printing impression member. This chain passes over pulleys 7, 16 carried respectively by the lever 5 and rod 9, and is fixed to a pin 18 on the lever 5. If a sheet is not fed correctly to the feed table 21 the feelers 26 engage apertures 25 in the table and hold fast a shaft 30 which is connected by a lever arm 31 to the rod 9. The rod 9 thus remains fixed as the pivoted lever 5 rises under the action of a grooved cam 3. As the chain pulley 16 does not rise, the raising of the pin 18 and pulley 7 operates the chain to throw-off the impression. If the feelers 26 are prevented by a sheet from engaging the apertures 25, the chain is not operated as the pulley 16 rises also, and in addition the following operations take place which are stopped if the rod 9 does not rise. The bottom end of rod 9, which is guided by a cam groove 15, moves to the left as the lever 5 begins to rise, and a projection 20 on the rod is engaged by a shoulder 19 in a recess 8 of the lever 5 through which the rod 9 passes. The raising of the rod 9 is assisted by a spring 10, and as the rod rises the shaft 30 is rotated to raise the feelers 26 by the action of an abutment 67, and the sheet guiding and smoothing device 39 is raised by the action of a spring- controlled bolt 33 carried by the arm 31 on an abutment 37 on a sleeve 38 which encircles the shaft 30 and carries the device 39. A roller 41 carried by the rod 9 acts on an arm 42 of a pivoted lever 43 which controls the position of a pivoted cam 49 and moves it to the position in which the grippers 59 can close on the sheet. The cam 49 is continuous with a fixed cam 50 which opens the grippers during transfer of the sheet. The pivoted lever 43 also acts to depress the front stops 22 by acting on an adjustable stop 65 on the lever 63 of the stops.