Importance

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Abstract

Disclosed is a button-hole sewing machine which includes an electric motor for driving the sewing machine; a machine body including a bed for holding a workpiece in cooperation with a workpiece clamping means; a stitch forming device for working button-holes in the workpiece and including a mechanism for driving a needle bar which supports a needle, a looper-spreader mechanism for driving a looper and a spreader, and a turning mechanism for turning the needle bar, the looper and the spreader. The needle bar driving mechanism includes a vertical reciprocation mechanism and a needle lateral vibrating mechanism; and an arm shaft for driving the up/down moving mechanism. The mechane further includes a bed shaft for driving the looper-spreader mechanism; a cutting mechanism for forming button-holes in the work; a control cam mechanism including a rapid feed mechanism for rapidly feeding the bed and a stitch feeding mechanism; a vertical shaft linked with the arm shaft for driving the needle vibrating mechanism, the lower shaft, and the stitch feeding mechanism; and a clutch means for transmitting torque of the motor to a rapid feed shaft to rapidly feed the bed through the rapid feeding mechanism in a rapid feeding mode and for transmitting the torque to selected one of the arm, vertical, and bed shafts to cause the stitch forming device to perform stitch forming through the stitch feeding mechanism. The motor is directly mounted on the machine body for portability.

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First Claim