Device for locking the needle bar of a sewing machine in one of

Details Device for locking the needle bar of a sewing machine in one of Device for locking the needle bar of a sewing machine in one of

1978-12-21

1980-03-18

Hunter, H. Hampton

Sewing

Elements

Starting or stopping

D05B 6922

Patent

active

041933621

ABSTRACT:
A device for a sewing machine for making functional and ornamental stitches permits locking the needle bar according to signals that are given from a pulse transmitter, which monitors the rotational position of the top shaft, to a control system which actuates the drive motor of the sewing machine in coincidence with a foot starter. The sewing machine possesses a manually adjustable stitch selector and a device controlled by the needle bar drive for monitoring the relative position of the end of an ornamental stitch pattern. With both the stitch selector and the monitor device are operatively connected respective reversing switches adapted to be brought each into one of two change-over positions. The two reversing switches are so connected that in the "ornamental stitch" position of the stitch selector the reversing switch of the monitor device in one position relays the position signals of the lower needle bar position to the control system and in the other position closes a break contact of an indicator circuit which signals the approximation of the end of an ornamental stitch pattern. If during the signaling operation the foot starter is released, the control system locks the needle bar in its lower end position after a certain number of stitches. If the stitch selector is in its "functional stitch" position, then upon release of the foot starter, the control system locks the needle bar in its upper final position.

REFERENCES:
patent: 3174450 (1965-03-01), Becker et al.
patent: 3636902 (1972-01-01), Matsubara et al.
patent: 3788250 (1974-01-01), Soeda
patent: 3804043 (1974-04-01), Benson et al.
patent: 4013933 (1977-03-01), Dohi et al.

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