Patent GB-1057661-A (GB)
Title: Improvements in or relating to duplicating and like machines
IPC: B41L11/00
Filed: 1962-04-27
Abstract: 1,057,661. Duplicating and like machines. BLOCK & ANDERSON Ltd. (D. Veenman). July 29, 1963 [April 27, 1962], No. 16281/62. Heading B6C. In a duplicating or like machine, a clip securing the master sheet or a masking sheet is opened and closed by power operation from a continuously rotating shaft, when the printing. drum is at rest, the connection to the shaft being under manual control, one actuation of which causes the clip to be opened and next actuation causes the clip to be closed. In one form, Fig. 1, a continuously-rotating shaft 20 has a gearwheel 19 fixed thereto, and a plate 14 and eccentric 21 freely rotatable thereon, the plate and eccentric being secured to one another. Two semicircular pawls 16 are pivoted on the plate 14, the tail 17 of each one abutting against the toothed head 18 of the other. The pawls 16 are spring-biased to engage the teeth with the gear 19 but are normally held inoperative by a clutch-control-lever 10 engaging one of the heads 18. Temporary clockwise movement of the lever 10 brought about by an operator through a cable 25, or direct key pressure or by an electromagnet controlled by a switch causes the members 14, 21 to be coupled to the gear 19 for half a revolution. During this rotation, the eccentric 21, which has locating notches 21a, 21b acts upon a roller 22 carried by a lever 23, and this lever carries a second roller 26 engaging a lever 27 operating the clip to open it. A second actuation of control lever 10 causes another halfrevolution of the eccentric 21 to open the clip. According to a second embodiment, Fig. 3 (not shown), the control lever 10 engages one or other of notches (30a, 30b) in a disc (30) freely rotatable on a continuously rotating shaft 20, and the disc (30) is connected to the eccentric 21, which is also free on the shaft, by a spring (36) which allows a limited relative rotary movement between the parts (30, 21). The shaft 20 has a rubber drive surface (31) thereon, and the eccentric 21 has rollers (32) with cut-away parts (33) and which are adjacent to the surface (31). With the lever 10 engaging one of the notches (30a, 30b) the spring (36) is stressed and the disc (30) is rotated relatively to the eccentric and in consequence rollers (32) are rotated to present their cut-away faces (33) towards. the surface (31) so that no drive takes place. Upon operation of the lever 10, the spring (36) causes relative rotation between the parts (21, 30) and also rotation of the rollers (32) into driving engagement with the surface (31) so that the eccentric rotates through half a revolution to operate the lever 23 and open or close the clip. In a third construction, Fig. 5, a rod 40 corresponding to control lever 10 is moved downwardly to initiate a clip actuation. A notch 40a on the rod moves the end of a link 41 downwardly into the path of a pin 44 on a continuouslyrotating disc 45, so that the link 41 is moved to actuate a lever 43 corresponding to lever 23, Fig. 1. A catch lever 48 moves under a roller 46 on the lever 43 to hold the lever in its displaced position. In this position, a lug 50 on a lever 51 pivoted to the catch lever is disposed beneath the notch 40a so that subsequent actuation of control-rod 40 causes, through the lever 51, release of the lever 43 so that the clip mechanism is again operated. If more than one clip is employed, separate control means for each clip are provided. Electric lamps or other means may be provided for indicating whether a clip is opened or closed.