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US 3,987,533 AGranted
Method and apparatus for manufacturing slide fastener stringer with improved fastening element count
AssigneeTextron Inc.
InventorJan Erik Sandgren
Life of this patent
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Abstract
In the manufacture of a slide fastener stringer, the relative count of fastening elements per unit length of the tape of the stringer being manufactured is continuously monitored and used as a feedback control to adjust the relative rate of advancement of either a train of fastening elements or a stringer-tape-forming member.
Claims22
A method of manufacturing a continuous stringer for a slide fastener comprising
- advancing a continuous train of fastening elements to an assembly station,
- advancing a continuous stringer-tape-forming member to the assembly station,
- assembling the train of fastening elements and the stringer-tape-forming member at the assembly station to form a continuous stringer having a carrier tape with the fastening elements secured to one edge of the tape,
- advancing the continuous stringer from the assembly station,
- sensing the relative quantity of fastening elements per unit length of the tape in the stringer after the assembly station, and
- controlling the relative rate of advancement of one of the continuous train of fastening elements and the continuous stringer-tape-forming member to the assembly station in response to the sensing to produce a continuous stringer having a substantially predetermined quantity of fastening elements per unit length of the tape.
3 more elements
An apparatus for manufacturing a continuous stringer for a slide fastener comprising
- means for assembling a continuous train of fastening elements and a continuous stringer-tape-forming member into a continuous stringer having a carrier tape with the fastening elements secured to one edge of the tape,
- first means for advancing the continuous train of fastening elements to the assembly means,
- second means for advancing the continuous stringer-tape-forming member to the assembly means,
- means for sensing the relative quantity of fastening elements per unit length of the carrier tape in the stringer, and
- means responsive to the sensing means for controlling one of the first and second advancing means to produce a substantially predetermined quantity of fastening elements per unit length of the carrier tape.
2 more elements
Dependencies are inferred from the claim text.