US 4,573,383 A · Apparatus for forming gaps in a slide fastener chain

Abstract

A space forming apparatus for producing an element-free space section of predetermined length at predetermined intervals in continuous slide fastener chain. Said apparatus comprises a transfer table for intermittently transferring the continuous slide fastener chain, a die disposed in the center of the transfer table, a punch disposed opposite to the die and having a longitudinal length substantially the same as that of the spaced sections to be formed, said punch being provided with a center projecting rib extending along a center line of a punch body, a pair of parallel inner cutting blades disposed on the both sides of the rib and a pair of parallel outer cutting blades disposed on the outer side each of the inner cutting blades, and a chain fixing device located on both sides of the die and opposite sites to them for clamping and securing the right and left stringers when the severed fragments of the coupling elements are removed from the sewing threads.

Claims6

Dependent claims

A punch for making spaced sections having a predetermined design into a pair of stringers in which a pair of elongated coupling elements in the form of continuous coils of synthetic resin monofilament are sewn to a pair of fastener tapes with sewing threads;

said punch comprising:
a center projecting rib extending along a center line of the lower surface of a punch body and having substantially the same length as that of the spaced section to be formed;
a pair of parallel left and right inner cutting blades formed on the lower surface of the punch body, said inner cutting blades being spaced from the center projecting rib at a distance less than half off the length between the pair of sewing threads to cut the upper leg portions of the coupling elements, said inner cutting blades having a short length in a longitudinal direction to cut at least one wind of the coupling elements adjacent to one end of the spaced section;
and
a pair of parallel left and right outer cutting blades formed on the lower surface of the punch body, said outer blades being spaced from the center projecting rib at a distance longer than half of the length between the pair of sewing threads to cut the connecting reversed portions of the coupling elements, said outer cutting elements having a long length in a longitudinal direction to cut the remaining winds of the coupling elements adjacent to the other end of the spaced section to be formed.

2 more elements

A space forming apparatus for producing an element-free spaced section of predetermined length at predetermined intervals in continuous slide fastener chain, comprising a transfer table for intermittently transfering the continuous slide fastener chain, a die disposed in the center of the transfer table, a space forming punch movably disposed for movement in the direction perpendicular to the direction of transfer of the slide fastener chain, a seizing device or ejector movable disposed for movement in the direction perpendicular to the direction of transfer of the slide fastener chain and sized to match that of the punch, and a chain fixing device located on both sides of the die and opposite sites to them for clamping and securing the right and left stringers, said space forming apparatus being characterized in that the punch comprises:

a center projecting rib extending along a center line of the lower surface of the punch body and having substantially the same length as that of the spaced section to be formed;
a pair of parallel left and right inner cutting blades formed on the lower surface of the punch body, said inner cutting blades being spaced from the center projecting rib at a distance less than half of the length between the pair of sewing threads to cut the upper leg portions of the coupling elements, said inner cutting blades having a short length in a longitudinal direction to cut at least one wind of the coupling elements adjacent to one end of the spaced section;
and
a pair of parallel left and right outer cutting blades formed on the lower surface of the punch body, said outer blades being spaced from the center projecting rib at a distance longer than half of the length between the pair of sewing threads to cut the connecting reversed portions of the coupling elements, said outer cutting elements having a long length in a longitudinal direction to cut the remaining winds of the coupling elements adjacent to the other end of the spaced section to be formed.

1 more element

Dependencies are inferred from the claim text.

Apparatus for forming gaps in a slide fastener chain

Life of this patent

Apparatus for forming gaps in a slide fastener chain

Life of this patent

Abstract

Claims6