Patent GB-826573-A (GB)
Title: Improvements in or relating to paper-cutting machines
IPC: B26D5/20
Filed: 1956-06-22
Abstract: 826,573. Paper-cutting machines. SCHNEIDER WERK G.m.b.H. June 22, 1956 [June 25, 1955], No. 19419/56. Class 31 (1). A paper-cutting machine is combined with magnetic recording and reproducing apparatus employing a magnetizable record carrier in the form of a tape or wire, the record carrier being directly or indirectly set in motion by the back gauge of the machine, which back gauge is driven by a motor, and being guided past a fixed record/replay head, whereby, when the apparatus is set for " record," signals are recorded on the record carrier, the signals corresponding to definite positions of the back gauge, and when the apparatus is set to " replay," the previously recorded signals produce control pulses in the apparatus which are amplified and serve to switch off the back gauge motor and to switch on a motor for a clamp and knife bar, and in which switching in of the back gauge motor after each stopping thereof and after each cut is completed, is effected by a switch which is operated by the movement of the cutting knife into the rest position, or by a time control. As shown, a spindle 5 for moving the back gauge 4 is connected to a movable scale tape 7 which runs over a forward and backward reversing reel 8. The spindle 5 is driven by an electric motor 10 through a gear 11 and has mounted on the rear end thereof a gear-wheel 12 which meshes with gear-wheels 13, 14 on shafts 17, 18 on which are mounted reels 19, 20 upon one of which a magnetizable record carrier in the form of a steel wire or tape 21 is wound for unwinding on to the other reel. The tape 21 is guided past a magnetic record/replay head 22 connected to an amplifier 23 from which various current conductors lead to the controls. The tape 21 can be of any length which is a multiple of the travel of the back gauge. In operation, assuming the back gage 4 to be in its most rearward position, the motor 10 is switched on to advance the back gauge until the desired first cutting position can be read off on the scale tape 7 whereupon the spindle 5 is finely adjusted by means of a hand wheel 6. The magnetic recording device is then switched on and by a push button an impulse is produced so that the record head records a signal on the carrier 21. The back gauge is then advanced to the next position and again a signal is recorded on the carrier 21, this operation being repeated until the whole spacing and cutting programme is recorded. The back gauge is now moved back to its rear position, and the magnetic device switched to " replay." The pile of paper to be cut is placed on a table 1, and the advance switched in. When the back gauge reaches the first desired cutting position, the signal on the record carrier produces an impulse in the magnetic device, which is amplified and stops the back gauge by a relay and starts the operation of the clamp and knife-bar at the same time. When the cut is completed, the above-mentioned switching operations are reversed, e.g. by a switch operated by the knife-bar after the completed cut or by a time control device, i.e. the spindle 5 is again driven for further advance of the back gauge 4, and at the same time the tape 21 is further wound off the reel 19 on to the reel 20, until the next signal on the tape 21 passes the head 22, by which the abovementioned switching operations for stopping the back gauge 4 and the start of the cutting operation are repeated. When the cutting of the programme is completed, the back gauge is moved backwards and the signal markings recorded on the tape 21 erased by operation of an " erase " switch. One or more further carriers 21a may be arranged to run parallel to the carrier 21. Alternatively, several programmes may be recorded independently of each other on to a single tape.