Masson Scott Thrissell Engineering Limited

John Edward Mockett

Graham A Byrt

Bernard Albert Graves

A stack of sheets is formed in a paper cutter by feeding spaced sheets from a first conveyor to a second and slower conveyor to overlap the sheets which are then fed onto a pallet, the latter being lowered as more sheets are fed. When a stack is near completion the first and second conveyors are decelerated and some sheets diverted from the first conveyor to form a gap in the flow of sheets, the second conveyor only is then accelerated for a period of time to enlarge the gap and then decelerate, both conveyors then being accelerated to normal speed. An auxiliary support is then moved into the path of the sheets falling on to the pallet in the gap previously created. While the completed stack is being removed a new stack is forming on the auxiliary support. The full pallet is replaced by an empty one and the auxiliary support is withdrawn to permit the new stack to drop onto the pallet. The gap may be created without diverting any sheets from the first conveyor and the stack may be changed without the use of the auxiliary support.

Sheet stacking apparatus

A continuous web of paper is fed from a reel by a driven roller and a cooperating pressure roller and cut into sheets by a pair of rotating knives. The shafts on which the driven roller and one of the knives are mounted, are drivingly connected by a presettably variable ratio gear box and the drive is obtained from a main motor which is connected to the driven roller shaft. A differential gear is positioned between the main motor and the driven roller, the shafts of which are connected to two of the input/outputs of the differential gear. The casing of the differential gear is connected to an auxiliary motor which is connected to a speed regulator. The speed of the web and the rotational speeds of the driven roller and the knife shaft are monitored and compared with the desired sheet length and a signal indicative of any error between the desired and actual sheet length is used to control the speed regulator.

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Deptford, United Kingdom

John Edward Mockett