Severing by tearing or breaking – Breaking or tearing apparatus – Combined with preliminary weakener or with nonbreaking cutter
Patent
1974-11-25
1977-04-12
Gilden, Leon
Severing by tearing or breaking
Breaking or tearing apparatus
Combined with preliminary weakener or with nonbreaking cutter
225 4, 225103, 83171, B26F 300
Patent
active
040170128
ABSTRACT:
A positive acting apparatus or machine is disclosed having an upper, downwardly movable blade assembly and a lower fixed position opposed blade assembly for cutting-off selected lengths of a resin or plastic sheetlike material. Fluid motors are employed for raising and lowering the upper blade assembly, and rack and gear means is provided for assuring that both end portions of the assembly move in exact synchronism. The upper blade is aligned with and operated on the same vertical plane as the lower blade, and means is provided for stopping downward movement of the upper blade when it approaches close adjacency with but before it engages the lower blade. Electrical heating elements extend longitudinally along the blade assemblies and are energized to maintain the blades at a raised temperature during their applicatin to the material. A withdrawal of the upper blade assembly after its downward stroke causes the under-engagement of an ejector with the main body of the material to move it upwardly with respect to and off the lower blade. Later, the advance portion of the material is severed from the main body by breaking the sheet at the line of previous blade action.
REFERENCES:
patent: 1706227 (1929-03-01), Gray
patent: 2334940 (1943-11-01), Tourneau
patent: 2789640 (1957-04-01), Belden
patent: 2997905 (1961-08-01), Larson
patent: 3757627 (1973-09-01), Lange
patent: 3821911 (1974-07-01), Seme
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