Apparatus for forming an element-free gap in a continuous slide fastener chain
AssigneeYoshida Kogyo K. K.
InventorHideo Shimai
Life of this patent
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Abstract
An apparatus for forming an element-free gap in a continuous slide fastener chain. In the apparatus, a reciprocating punch blade has cutting edges along opposite sides and is relieved at opposite ends along the cutting edges so as to form a pair of wing portions disposed one on each side of the punch blade. An elongated slot formed in a die for receiving the cutting edges has at its opposite ends a pair of lateral branches disposed one on each side of the elongated slot in opposite relation to the sides of the punch blade on which the wing portions are disposed. The wing portions and the lateral branches jointly serve to protect a pair of coupling elements disposed adjacent to the opposite ends of the space section from being cut by the punch blade.
Claims10
An apparatus for forming a space section devoid of coupling elements in a continuous slide fastener chain having a pair of rows of interengaged coupling elements, the apparatus comprising:
- (a) a stationary die having an elongated vertical slot opening to the top surface of said die for underlying the interengaged coupling elements;
- (b) a reciprocable punch blade movable toward and away from said die and having cutting edges along opposite sides, said cutting edges being projectable into said elongated slot for cutting the interengaged coupling element along a length corresponding to the length of the space section to be formed, and
- (c) means responsive to the position of said punch blade for locating the slide fastener chain in the desired position relative to said punch blade,
- (d) said punch blade being relieved at opposite ends along said cutting edges so as to form a pair of wing portions disposed one on each side of said punch blade, said elongated slot in said die having at its opposite ends a pair of lateral branches disposed one on each side of said elongated slot in opposite relation to said sides of said punch blade on which said wing portions are disposed, respectively.
Dependencies are inferred from the claim text.