Sewing – Stitch forming – Feeding work material
Patent
1983-03-10
1984-07-31
Schroeder, Werner H.
Sewing
Stitch forming
Feeding work material
112200, D05B 2702
Patent
active
044623259
ABSTRACT:
An apparatus for adjusting stitch length in a sewing machine by means of a selectively adjustable eccentric possessing a self-locking device. The apparatus includes a support collar fixed on the machine's main shaft with an eccentric support mounted on the support collar which is operatively connected to a connecting rod for actuating the machine's feed dog. The eccentric support includes a central opening within which the adjustable eccentric is operatively disposed and which forms an integral part of a support ring rotatably mounted on the machine's main shaft. A manually operable push button serves to hold the support ring stationary and to release the self-locking device. The machine includes the conventional hand wheel fixed on one end of the machine's main shaft and, while the pushbutton is held in a depressed condition, the self-locking device remains in a released state thus enabling the selective rotation of the machine's main shaft by the hand wheel. This rotation effects a change in position of the adjustable eccentric within the eccentric support and the amount the connecting rod travels to actuate the feed dog. The selective positioning of the adjustable eccentric is maintained by release of the push button that activates the self-locking device.
REFERENCES:
patent: 2161579 (1939-06-01), Kaier
patent: 2491449 (1949-12-01), Hirsch
patent: 2718860 (1955-09-01), Hale
patent: 2851976 (1958-09-01), Covert
Motta Bruno
Nava Erminio
Falik Andrew M.
Rockwell-Rimoldi S.p.A.
Schroeder Werner H.
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