Patent GB-548563-A (GB)
Title: An improved repeat mechanism for printing machines
IPC: B41L47/58
Filed: 1941-04-10
Abstract: 548,563. Series-printing machines. ADREMA, Ltd., and SANDERSON, T. E. F. April 10, 1941. No. 4780. [Class 100 (ii)] Relates to repeat printing mechanism for machines of the kind in which printing plates are fed successively by a shuttle device from a magazine to the printing station beneath an impression pad carried by an oscillating platen arm, the feed movement of the plate taking place on the upwards, non-printing movement of the platen arm. The feed shuttle is actuated by the platen arm through a dis-connectable latch controlled by a rockable finger 15, Fig. 2, on a shaft 45. When the shaft 45 is rocked in a clockwise direction, the finger 15 is depressed and allows the latch to become operative to feed a printing plate. This movement of the shaft 45 is effected by the engagement with a nose 25a on a rocker 25 fixed to the shaft 45, of a pin 24 on a disc 21 turned step by step, the initial distance of the pin 24 from the nose determining the number of prints from the plate in the case of duplicate, triplicate and quadruplicate impressions. The step by step movement of the disc 21 is effected by a pawl 31 operated with the platen arm and engaging spaced pins 23 on the disc 21, reverse movement of the disc being prevented by a locking gravity pawl 36 engaging pins 22 on the opposite side of the disc. A pin 47 on the arm 37 of the pawl 36 normally idles in a slot 46 in a link 34a connected to a rocker 34 through which extends a rod 33 projecting from the pawl 31. When the rocker 25 is turned by the pin 24, a pin 41 on this rocker lifts a bar 40 reciprocating in synchronism with the movements of the platen arm so that a block 42 on the bar engages a pin 44 on the pawl 36, disconnecting the pawl from the pins 22 and causing the pin 47 to raise the link 34a so that the rocker 34 disconnects the pawl 31 from the pins 23. The disc 21 is thus freed and is returned to its initial position by a spring. This initial position is determined for duplicate, triplicate or quadruplicate impressions by the depression of a corresponding key "2", "3", or "4" which acts upon a bar 27 carried by a quadrant 28 to turn the quadrant to a corresponding extent. This quadrant meshes with a pinion 29 which has a lug engaging a lug on the disc 21 so that the disc is turned in an anti-clockwise direction to a set position in which it is held by the pawl 36. For ordinary consecutive printing, a key "1" is depressed, thereby depressing a link 54, having a slot engaging a pin on the rocker 25. The rocker is thereby turned to move the finger 15 to an inoperative position. At the same time a pin 56, Fig. 2, actuates the rocker 34 to move the pawls 31, 36 to an inoperative position. To print indefinitely from any plate, a key "OO" is depressed. This acts directly on the rocker 34, to move the pawls 31, 36 to the inoperative position but the rocker 25 is not actuated so that the finger 15 continues to hold the shuttle inoperative. When plates are to be skipped, a skip control pedal is depressed to disconnect the platen arm from us operating mechanism and at the same time, a rocker 48, pivoted on the shaft 45, is turned so that a pin 50 thereon lifts the rocker 25 to allow the unwanted plate to be fed through the machine. At the same time, a second pin 49 on the rocker 48 acts through a trip plate 51 pivoted on the pin 47, to move the pawls 36, 31 to the inoperative position. Specification 548,562 is referred to.