Automatic knife alignment for shear

Details Automatic knife alignment for shear Automatic knife alignment for shear

1982-12-06

1986-12-02

Yost, Frank T.

Cutting

Operation controlled by detector means responsive to work

Positioning of tool controlled

83640, B26D 726

Patent

active

046256059

ABSTRACT:
A device is provided to automatically adjust the horizontal space between movable and fixed knives of a metal cutting shear. Bellcranks are mounted on opposite sides of the shear frame with first arms in contact with the outboard vertical sides of the movable knife holder and with second arms positioned beneath the opposite outboard ends of the shear hold down clamp. Followers on the hold down clamp make contact with the second arms as the hold down clamp is lowered into clamping engagement with the top surface of a metal strip or plate to be sheared. The followers shift the second arms downwardly causing the first arms to shift the movable knife horizontally toward the fixed knife. The respective lengths of the first and second arms are selected to cause the horizontal shift of the movable knife to be a predetermined fraction of the vertical movement of the second arms to provide the correct clearance between knives for the determined thickness of the strip about to be sheared.

REFERENCES:
patent: 3282141 (1966-11-01), Gautron
patent: 3371569 (1968-03-01), Pearson et al.
patent: 3756110 (1973-09-01), Von Arx
patent: 3968714 (1976-07-01), Kuchyt
patent: 4507997 (1985-04-01), Ikeda

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