Apparatus for trimming the marginal portions of paper sheets or

Details Apparatus for trimming the marginal portions of paper sheets or Apparatus for trimming the marginal portions of paper sheets or

1982-06-18

1984-11-06

Schran, Donald R.

Cutting

Rotatable disc tool pair or tool and carrier

Tool element mounted for adjustment

83349, 83676, 83925A, B26D 120

Patent

active

044805187

ABSTRACT:
An apparatus for simultaneously trimming both lateral marginal portions of a scalloped stream of sheets has a transporting unit which is driven to advance the stream in a horizontal cutting plane flanked by two stationary counterknives which are mounted below the cutting plane and whose cutting portions are disposed in the cutting plane. The sheets in the cutting plane are biased against the transporting unit and their marginal portions are trimmed by the cutting edges of radial knives mounted on two coaxial rotary holders disposed at a level above the cutting plane and each cooperating with a different one of the counterknives. The cutting edges of the knives are inclined with reference to the longitudinal directions of the respective knives and orbit along endless paths which are intersected by the cutting plane so that each cutting edge which reaches the cutting plane moves below such plane before beginning to move upwardly and above the cutting plane. The cutting plane and the cutting edges make an angle of 0.degree.-15.degree. when the cutting edges reach the cutting plane, and the angle between the cutting plane and the cutting edges is 15.degree.-45.degree. when the respective knives extend at right angles to the cutting plane so that the cutting edges are disposed in the lowermost portions of their respective endless paths. The speed at which the cutting edges orbit greatly exceeds the speed of travel of sheets in the cutting plane.

REFERENCES:
patent: 1510782 (1924-10-01), Hussey
patent: 1676048 (1928-07-01), Philbrick
patent: 2771949 (1956-11-01), Sigoda
patent: 3726167 (1973-04-01), Barbour

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