Electrical impulse hot hole punch for making a tear-resistant ho

Details Electrical impulse hot hole punch for making a tear-resistant ho Electrical impulse hot hole punch for making a tear-resistant ho

1989-11-13

1992-08-18

Bartis, Anthony

Electric heating

Heating devices

Tool or instrument

83 16, 83171, 156515, 1565832, 219233, 219243, H05B 100, B26D 710, B26F 312

Patent

active

051401339

ABSTRACT:
An electrical impulse hot hole punch apparatus is presented herein for making a tear-resistant hole in a sheet of thermoplastic film. The apparatus includes an electric heating element which is supported for selective reciprocal movement transverse to a sheet of film between a first position, remote from the film, and a film melt position at which the heating element is positioned proximate to the film. An impulse generating circuit is operative in response to the heating element being moved to its film melt position for purposes of supplying an electric current pulse to the heating element. The current pulse has a time duration on the order of one half cycle of an AC voltage pulse and is of a magnitude sufficient to heat the heating element to a temperature in excess of the melting point of the film.

REFERENCES:
patent: 3525279 (1970-08-01), Christian
patent: 3654829 (1972-04-01), Anderson
patent: 3687789 (1972-08-01), Wheeler
patent: 3822164 (1974-07-01), Guido et al.
patent: 3876858 (1975-04-01), Davis et al.
patent: 3902042 (1975-08-01), Goldfarb et al.
patent: 4093491 (1978-06-01), Whelpton et al.
patent: 4414872 (1983-11-01), Bard et al.
patent: 4449434 (1984-05-01), Johnson

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