Punching apparatus

Details Punching apparatus Punching apparatus

1988-09-26

1990-06-26

Yost, Frank T.

Cutting

Means to drive or to guide tool

With simple rectilinear reciprocating motion only

83213, 83543, 83859, 72452, 74 57, B26F 104

Patent

active

049361783

ABSTRACT:
A punching apparatus, preferably for punching intermittently moving webs of synthetic thermoplastics, comprises top and bottom tools, which are mounted in a machine frame and at least one of which is connected to a drive for moving said one tool up and down. The tools for making the punching cut consist of a knife plate or a knife ring and a backing plate or a backing ring and at the end of the punching cut strike against each other or almost contact each other.

REFERENCES:
patent: 1134047 (1915-03-01), Hunter
patent: 1224471 (1917-05-01), Kollock et al.
patent: 1763500 (1930-06-01), Bowen
patent: 3072003 (1963-01-01), Sirugue
patent: 3111053 (1963-11-01), Svensson
patent: 3386324 (1968-06-01), Ihle
patent: 3760676 (1973-09-01), Daniels
patent: 4638731 (1987-01-01), Kato

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