Importance

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Abstract

A buttonhole closing device for a lockstitch bar tacking sewing machine comprises a feed plate for holding the buttonhole of a sewn product thereon, an arch clamp frame which is supported by the feed plate on the side thereof so as to be vertically swingable, a first and a second movable clamp feet which are swingably connected to the arch clamp frame by way of pins separately and which are arranged on the left and right sides of a center clamp foot at the clamp portions formed at the front ends thereof respectively, a clamp foot unit driving mechanism, pin portions and cam portions for converting the longitudinal movement of the clamp foot unit driving mechanism into the lateral swinging of the first and second movable clamp feet and driving units for driving the clamp foot unit driving mechanism forward or backward. As a result, it is possible to arrange the clamp foot unit driving mechanism for separately moving the first and second movable clamp feet toward the center line of the buttonhole apart from the operator's hands, so that he can secure a broad space for handling the sewn products to improve operability.

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First Claim