Sewing machine with latch back device
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United States of America Patent
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Apr 20, 1993
Grant Date -
N/A
app pub date -
Dec 20, 1990
filing date -
Dec 20, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for creating a 'serging', 'overlock' or '504' stitch wherein the excess thread chain (44) extending from the sewing machine needle to the previously sewn garment part (54) is cut in a manner to create a leading thread chain of a predetermined length extending from the sewing machine needle, and the free end of the leading thread chain is drawn off by a stream of air flowing into a hollow member (31) acting as a chaining tongue (29). The leading thread chain is subsequently progressively withdrawn from the chaining tongue and oversewn into the stitching of a succeeding garment. The hollow member (31) acting as the chaining tongue (29) is integrally formed with the throat plate (21) of the sewing machine (20). A vacuum reservoir (81) is connected to the hollow member (31) to create the air flow through the hollow member to draw the leading thread chain therein.
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