Importance

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Abstract

A looper mechanism for use in a sewing machine which includes a needle moved substantially vertically through a needle plate while inclined in a feed direction of cloth. The looper mechanism includes a lower looper which performs an arcuate reciprocating motion crosswise to the locus of the needle at the lower side of the needle plate, and an upper looper which performs an elliptically-arcuate reciprocating motion crosswise to the locus of the lower looper at the side of the needle plate and crosswise to the locus of the needle at the upper side of the needle. A needle thread which is passed through the needle, an lower-looper thread passed through the lower looper and an upper-looper thread passed through the upper looper being cross with one another to perform sewing. At least one of the upper looper and the lower looper has a hollow structure through which a looper thread is passed from a thread inlet of the looper to a tapered thread outlet. The hollow structure is a tube member and a groove engageable with the tube member, or the combination of a groove and a lid member covering the groove. The thread inlet of the looper may be funnel-shaped.

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First Claim