Sewing machine with a device for amending thread tightening by n

Details Sewing machine with a device for amending thread tightening by n Sewing machine with a device for amending thread tightening by n

1988-11-02

1990-08-21

Nerbun, Peter

Sewing

Special machines

Darning

112241, 112254, 112453, D05B 302, D05B 4704, D05B 4900

Patent

active

049496573

ABSTRACT:
A sewing machine comprises a thread deflecting device arranged between a thread take-up lever and a needle and which in response to a swinging movement of a needle bar effected in response to selection of a zigzag stitch, deflects the upper thread laterally of a fabric feeding direction. A thread blocking device is provided on one side of the thread deflecting device. The sewing machine further comprises an actuator operated in response to actuation of a zigzag stitch pattern selecting key to move the thread blocking device to an operative position thereof. The thread blocking device in the operative position blocks the upper thread as it is deflected in one direction by the thread deflecting device to give a predetermined degree of tension to the upper thread, so that the stitch is tightened on one side of the zigzag stitch in addition to the tightening of the stitch by a thread take-up lever.

REFERENCES:
patent: 4690083 (1987-09-01), Hara et al.
patent: 4706589 (1987-11-01), Tsukioka
patent: 4793273 (1988-12-01), Hara et al.

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