Lockstitch sewing machine

Details Lockstitch sewing machine Lockstitch sewing machine

1984-09-07

1985-11-19

Hunter, H. Hampton

Sewing

Special machines

Leather sewing

112 58, 112243, 112239, 112274, D05B 1502

Patent

active

045534900

ABSTRACT:
A lockstitch sewing machine has, in addition to stitch forming instrumentalities (22, 24), a needle thread control arrangement (32) by which the tension in the needle thread (T2) is controlled during stitch formation. In addition, said arrangement (32) ensures that each formed stitch is drawn into the body of the workpiece, by pulling on the thread while it remains clamped by thread clamping means (200, 202). This pulling takes place in the early stages of the formation of the next stitch so that, at the end of the machine stitching cycle, the final stitch is not set by this arrangement (32). Instead, electrically actuated stitch setting means (220 to 226) is provided operable in response to an "end of cycle" signal supplied by control means by which further "end of cycle" functions (e.g. release of a presser foot (36) and of the thread clamping means (200, 202) are also controlled.

REFERENCES:
patent: 658604 (1900-09-01), Warren
patent: 684540 (1901-10-01), Chadbourn
patent: 957954 (1910-05-01), Heys
patent: 2928361 (1960-03-01), Ashworth et al.

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