Abstract An apparatus is disclosed for producing fastener-element-free gaps in a continuous slide fastener chain. The apparatus comprises a punch block, a cutting punch reciprocally movable therein, and a die block positioned in oppositely spaced relation to said punch block and having a recess for receiving a group of fastener elements to be severed, said cutting punch having an upward stroke limited such that the distance between an extreme operating end of said punch and the bottom surface of said recess is smaller than the overall thickness of said fastener chain but larger than the thickness of said fastener elements. The arrangement of the apparatus ensures that adjacent longitudinal edges of the fastener stringer tapes are deflected upwardly progressively away from each other as the fastener chain is moved past the cutting punch so that a group of fastener elements severed off the deflected edges of said tapes along a length of the chain corresponding to a fastener-element-free gap to be produced.
An apparatus for producing fastener-element-free gaps in a continuous slide fastener chain having a pair of oppositely disposed stringer tapes carrying along their adjacent longitudinal edges two rows of interlocking fastener elements, the coupling parts of which elements on the one stringer tape extend into the longitudinal edge region of the other stringer tape when the fastener is closed, said apparatus comprising a punch block, a cutting punch reciprocally movable therein, and a die block positioned in oppositely spaced relation to said punch block and having a recess for receiving a group of fastener elements to be severed and an opening formed centrally of said recess for receiving said cutting punch during the downward stroke thereof in which said group of fastener elements is severed, said cutting punch having an upward stroke limited such that the distance between an extreme operating end of said punch and the bottom surface of said recess is smaller than the overall thickness of said fastener chain but larger than the thickness of said fastener elements.
Claim 2
Independent Claim
171 words
An apparatus for producing fastener-element-free gaps in a continuous slide fastener chain having a pair of oppositely disposed stringer tapes carrying along their adjacent longitudinal edges two rows of interlocking fastener elements, the coupling parts of which elements on the one stringer tape extend into the longitudinal edge region of the other stringer tape when the fastener is closed, said apparatus comprising a punch block, a cutting punch reciprocally movable therein, and a die block positioned in oppositely spaced relation to said punch block and having a recess for receiving a group of fastener elements to be severed and an opening formed centrally of said recess for receiving said cutting punch during the downward stroke thereof in which said group of fastener elements is severed, said cutting punch having an upward stroke limited such that the distance between an extreme operating end of said punch and the bottom surface of said recess is smaller than the overall thickness of said fastener chain but larger than the thickness of said fastener elements.
Claim 3
Dependent Claim
44 words
The apparatus as defined in claim 1 which further includes an auxiliary cutter attached to said cutting punch, said cutter having a bladed tip end situated up above the lower end of said punch block when said cutting punch is held in retracted position.