Method and apparatus for forming element-free spaces in slide fa

Details Method and apparatus for forming element-free spaces in slide fa Method and apparatus for forming element-free spaces in slide fa

1984-06-22

1987-01-27

Schran, Donald R.

Metal working

Method of mechanical manufacture

Of a slide fastener

29 332, 29770, 83921, B23P 1100

Patent

active

046385428

ABSTRACT:
A punch blade depresses the coupling heads of a length of successive filamentary coupling elements toward a knockout blade while sandwiching stringer tapes between upper and lower grippers. The punch blade is lowered until lower legs of the coupling elements are cut off by cutter blades. The punch blade and the knockout blade are then lifted while gripping the severed coupling elements therebetween to forcibly remove the coupling elements out of engagement with sewing threads on the stringer tapes. The upper grippers have confronting steps for engaging the sewing threads so that the severed coupling elements can be detached reliably and smoothly from the stringer tapes without unduly tensioning the sewing threads and stringer tapes. The punch blade may have a vertical reinforcement member attached to at least one side edge thereof and having a lower tooth projecting downwardly beyond a lower edge for being pressed against the coupling elements. The lower tooth enters between adjacent coupling elements to position the coupling elements against unwanted longitudinal displacement with respect to the punch blade.

REFERENCES:
patent: 3128543 (1964-04-01), Fasciano
patent: 3456328 (1969-07-01), Wasko
patent: 3490133 (1970-01-01), Gleirdmeyer et al.
patent: 3763546 (1973-10-01), Perlman
patent: 3812754 (1974-05-01), Kawakami
patent: 3852869 (1974-12-01), Shimai
patent: 3863323 (1975-02-01), Takamatsu
patent: 4131223 (1978-12-01), Aureli
patent: 4404722 (1983-09-01), Shimai

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