US 5,850,791 A · Sewing machine having movable bed

Abstract

A sewing machine including a needle bar having a sewing needle, a spindle for driving the needle bar, a bed portion movable selectively to a using position or a retracted position, and a rotary hook housed in the bed portion. A stitch is formed by the cooperation of the sewing needle and the rotary hook. A rotary hook drive motor is provided in the bed portion for driving the rotary hook. A sensor is provided for detecting a position of the bed portion. The needle bar and the spindle is selectively disconnected from each other. If the bed portion is out of the using position, and this out position is detected by the sensor, the needle bar is released from the spindle for stopping the sewing needle. Further, in this case, the rotation of the rotary hook drive motor is also stopped.

Claims20

Dependent claims

A sewing machine for stitching a workpiece fabric with a needle thread and a bobbin thread comprising:

a base frame;
at least one head portion mounted on the base frame;
at least one bed portion movable between a using position and a retracting position with respect to the at least one head portion, the bed portion accommodating therein a rotary hook containing the bobbin thread;
a needle bar having a lower end fixedly provided with a sewing needle through which the needle thread is passed, the needle bar being supported and reciprocally driven by the at least one head portion, a stitching being formed by cooperation of the sewing needle and the rotary hook;
judgment means for making judgment as to whether or not the at least one bed portion is at the using position;
and
stitch suspension means for stopping the cooperation of the sewing needle and the rotary hook when the judgment means determines that the bed portion is out of the using position.

4 more elements

Dependencies are inferred from the claim text.

Sewing machine having movable bed

Life of this patent

Sewing machine having movable bed

Life of this patent

Abstract

Claims20