Stitch shortening device for a blind stitch sewing machine

Details Stitch shortening device for a blind stitch sewing machine Stitch shortening device for a blind stitch sewing machine

1984-09-04

1985-10-29

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

112178, D05B 124, D05B 2722

Patent

active

045494959

ABSTRACT:
A stitch shortening device for a blind stitch sewing machine. A multiple cam is provided for reciprocating the feed drive lever. An adjustment wheel with peripheral teeth regulates the drive position of the multiple cam for lengthening or shortening the stitch by adjusting the feed drive. A pneumatic motor drives a toothed wheel meshing with the peripheral teeth of the adjusting wheel. When the pneumatic power is applied, the motor rotates the adjusting wheel in the direction of rotation of the sewing machine shaft but at a greater speed to maintain the adjusting wheel in large stitch drive position. When the operator activates a switch to cut off the pneumatic drive, the toothed wheel is idled and the adjusting wheel is moved into short stitch drive position. Applying the pneumatic power again moves the adjusting wheel into large stitch drive position again.

REFERENCES:
patent: 2894470 (1959-07-01), Buono
patent: 3985088 (1976-10-01), Sugahara
patent: 4416207 (1983-11-01), Maier
patent: 4462325 (1984-07-01), Motta et al.

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