Sewing – Elements – Starting or stopping
Patent
1975-06-23
1978-04-11
Hunter, H. Hampton
Sewing
Elements
Starting or stopping
D05B 6922
Patent
active
040833160
ABSTRACT:
A sewing machine for making continuous and intermittent stitches has a main shaft which is continuously rotated by a pulley and a clutch mechanism during the making of continuous stitches. The clutch mechanism is repeatedly disengaged by a blocking device when the machine makes intermittent stitches. The blocking device is rotatable, within limits, on the main shaft and can be arrested by a pawl which is mounted on a holder controlled by a stitch selecting cam. The cam can move the pawl nearer to or further away from the blocking device and the pawl has a follower which is located in the path of movement of a second cam, which is integral with the blocking device or rotates with the main shaft, when the stitch selecting cam has moved the pawl nearer to the blocking device whereby the rotating second cam pivots a pallet of the pawl into the path of movement of a shoulder on the blocking device. The clutch mechanism has an actuating lever which normally couples the pulley to the main shaft but disengages the pulley from the main shaft when pivoted by a surface on the blocking device while the latter is held by the pawl. When the stitch selecting cam is set for intermittent stitching, each actuation of the foot pedal results in rotation of the main shaft through one full revolution, and the main shaft thereupon arrests the needle in the upper dead center position.
REFERENCES:
patent: 3253685 (1966-05-01), Marola et al.
Hunter H. Hampton
Janome Sewing Machine Co. Ltd.
Striker Michael J.
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