Sewing machine having needle bar disconnecting mechanism and thr

Details Sewing machine having needle bar disconnecting mechanism and thr Sewing machine having needle bar disconnecting mechanism and thr

1991-03-27

1992-07-28

Nerbun, Peter

Sewing

Elements

Driving mechanisms

112291, 112300, 112453, D05B 6900, D05B 6500, D05B 302

Patent

active

051332728

ABSTRACT:
A sewing machine incorporates a needle bar disconnecting mechanism (3) and a thread cutting mechanism (9). The needle bar disconnecting mechanism (3) is interposed between an arm spindle (2) and a needle bar (4), which normally transmits rotations of the arm spindle (2) to the needle bar (4) to vertically move the latter up and down but disconnects the needle bar (4) from the arm spindle (2) to stop the vertical movement of the needle bar (4) when actuated. The thread cutting mechanism (9) cuts threads at the termination of stitching. A rotational phase detecting mechanism (11) is provided for detecting a rotational phase of the arm spindle (2). An electronic control circuit (12) actuates the needle bar disconnecting mechanism (3) when the rotational phase detecting mechanism (11) detects that the arm spindle (2) has reached a predetermined rotational phase after the thread cutting mechanism (9) is actuated. Therefore, after the threads are cut, a needle (5) attached to the needle bar (4) does not stick into a workpiece fabric.

REFERENCES:
patent: 3889615 (1975-06-01), Uozake et al.
patent: 4173193 (1979-11-01), Morinaga et al.
patent: 4325313 (1982-04-01), Kawai et al.
patent: 4592297 (1986-06-01), Asano et al.
patent: 4744319 (1988-05-01), Rohr
patent: 4995328 (1991-02-01), Tanaka

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