Patent GB-988889-A (GB)
Title: Improvements in or relating to guillotine back stop control units
Inventor: GOREHAM PETER ERNEST
IPC: G05B19/12
Filed: 1962-05-22
Abstract: 988,889. Guillotine cutting machines; punching. VICTORY - KIDDER PRINTING MACHINE CO. Ltd. May 22, 1963 [May 22, 1962], No. 19630/62. Heading B4B. A guillotine back stop control unit for cutting paper stacks comprises a tape 5, Fig. 1, which is driven by means 3 in synchronism with the movement of the back stop and is provided with a plurality of channels of control indicia, the portions of the indicia in the first channel corresponding to positions at which the back stop is to be halted in a first forward movement for a series of cuts to be made in the stack, the position of the indicia in the second channel corresponding to the stopping of the back stop in a reverse direction, and the positions of the indicia in the third channel corresponding to positions at which the back stop is to be halted in a second forward movement for a second series of cuts to be made in the stack which has been swung through right-angles after cutting of the first series. Sensing means 11 sense the positions of the indicia in the channels and switch means 21, Fig. 2, select the operative channel on the tape. As described, sprocketed Manilla tape punched with holes arranged in three parallel rows 38 ... 40, Fig. 7 (i.e. the above-mentioned control channels) is wound from a spool 6, Fig. 1, to a spool 7, and vice versa, by a conductive disc 3 bearing pins 4 and driven in synchronism with the movement of the back stop. A framework 10 movable towards the disc by a lever 12 carries two sets of sensing brushes 11a, 11b, each including three brushes which contact the disc 3 through the punched holes in the tape. An apertured disc 13 is mounted for movement with the back stop shaft 2, Fig. 2, and is engaged with corresponding apertures in the disc 3 by a pin 14, Fig. 1. In operation, a system of relays and switches provide for control of the machine in response to actuation of a switch 16, Fig. 2, having " Hand," " Manual," " Semi-automatic " and " Automatic " positions. In the " Hand " position the guillotine is operated by buttons 17 and the back stop by a wheel 35. The position is also used to set up the tape-programme, by moving the back-stop to the desired position, operating the disc clutch 13 by removing the pin 14 from the discs 3, 13, displacing the tape to a punching position corresponding to the distance between the brushes 11 and the punches 15, and reinserting the pin 14, the required hole being made by manual depression of an appropriate punch 15, and resetting the clutch to return the tape to its original sensing position. In the " Manual " position of switch 16, the forward button 19 is operated to open a reverse-clutch circuit and prevent the back stop being reversed if both forward and reverse buttons 19, 20 are operated together. A forward clutch is arranged to drive the back stop forwards only while button 19 is pressed. On its release, when the back stop is in its required position, the guillotine is operated by buttons 17. At the end of the back stop movement limit-switches operate to de-energize the forward clutch and stop movement of the back stop. To return the backstop, the button 20 makes a circuit through the reverse clutch until released or movement is stopped by an appropriate limit switch. In the " Semi-automatic " position of switch 16, switches 22 are pressed to prepare a relay circuit and movement of the back-stop continues until a circuit is made through a sensing brush 1 la, and the forward-clutch is disconnected, a brake solenoid is energized and the back stop is halted. The guillotine buttons 17 are pressed and the back stop halts until buttons 22 are pressed again to repeat the cycle. For reverse movement, button 20 is depressed, the reverse clutch is operated until the track 2 brush 11b is operative, which operates a relay to disconnect the back-stop drive and apply a brake. At the end of the reverse movement track 3 is selected by switch 21, the paper stack is turned through 90 degrees and the back stop is moved as described for track 1, the third track controlling the transverse cutting operation. In the " Automatic " position of switch 16, operation is somewhat as above, but a circuit is made to operate the guillotine without using buttons 17. When the cut is nearly complete, a further switch closes to make a circuit through a relay and brushes 11a, 11c energizes a further relay and resume forward feeding by the backstop. When the appropriate sensing brush 11b senses apertures in track 2, the reverse clutch operates causing the back stop to be moved in the reverse direction without applying the brake. When a second brush 11b senses a further aperture a relay is energized to de-energize the reverse clutch and a brake is applied arresting the back-stop. The paper stack is then turned through 90 degrees, the third track is selected, and the back stop is operated as before.