Button hole sewing machine

Sewing – Special machines – Buttonhole

Patent

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Details

112294, D05B 306, D05B 6502

Patent

active

058485732

ABSTRACT:
A buttonhole sewing machine includes a holding mechanism attached to a holder arm which reciprocates in a direction perpendicular to an amplitude direction of a needle. The holding mechanism includes a workpiece holder plate and constitutes a parallelogram linkage. The holding mechanism maintains a parallelogram shape even when the holder plate slants on a fold of the workpiece, and securely holds the workpiece. This buttonhole sewing machine also includes a cutting mechanism which cuts thread and braid in a short manner even when the holder plate slants. The cutting mechanism has a rotary cutter and a fixed cutter, and the fixed cutter is fixed on the holder plate while inclined from a proximal portion to a distal portion. A wire member is connected to the mobile cutter to facilitate the rotation of the rotary cutter even when the holder plate slants.

REFERENCES:
patent: 3847101 (1974-11-01), Tolle
patent: 4616582 (1986-10-01), Hager
patent: 4919061 (1990-04-01), Riss

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