Apparatus for trimming stacks of paper sheets or the like

Details Apparatus for trimming stacks of paper sheets or the like Apparatus for trimming stacks of paper sheets or the like

1985-09-16

1986-10-07

Schran, Donald R.

Cutting

Tool engages work during dwell of intermittent workfeed

Interlock between tool actuating and work feed means

83240, 83305, 83557, 83925A, B26D 722, B26D 514

Patent

active

046152490

ABSTRACT:
A machine for trimming the edges of stacked paper sheets at a trimming station has a conveyor which delivers successive stacks to the trimming station, several knives which are movable from raised positions to lower end positions to thereby trim the respective edges of a stack at the trimming station, anvil blocks which are penetrated into by the cutting edges of the knives when the knives complete their working strokes subsequent to trimming of a stack, and a control unit which prevents the knives from contacting the respective blocks if the knives perform working strokes in the absence of a stack at the trimming station. The control unit can shift the working strokes of the knives and/or lower the blocks to thus ensure that the cutting edges of the knives are arrested short of the respective blocks when a photocell detects the absence of a stack at the trimming station while the knives perform their working strokes.

REFERENCES:
patent: 4134334 (1979-01-01), Johnson
patent: 4202232 (1980-05-01), Muller

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