Sewing – With tables or stands – For plural sewing units
Patent
1975-04-25
1976-04-13
Schroeder, Werner H.
Sewing
With tables or stands
For plural sewing units
D05B 2722
Patent
active
039496910
ABSTRACT:
An automatic back-tack feed control mechanism for the work feed regulating system of a sewing machine which feed regulating system includes a rock shaft and a feed block adapted to influence movement imparted to a feed dog for transporting work fabric transversely of the work surface of the machine according to a selected stitch length. A stitch length selector dial located on the machine includes a reverse feed button connected through a rock arm ultimately to the rock shaft so as to tilt the feed block for reverse feed motion of the feed dog for back tacking. At one preselected stitch length, back tacking is automatic for a predetermined number of stitches since the depression of the reverse feed button actuates a latch lever which locks the rock arm in a reverse feed position until a ratchet mechanism also set in motion by depression of the reverse feed button causes disengagement of the latch lever and rock arm whereby the feed dog is again placed in a forward feed mode. Camming means are also provided so that manual, non-automatic, back tacking can be performed at other selected stitch lengths.
REFERENCES:
patent: 3468273 (1969-09-01), Lester
patent: 3742881 (1973-07-01), Heine et al.
patent: 3796172 (1974-03-01), Seiriki
Bell E. L.
Nerbun Peter
Schroeder Werner H.
Smith R. E.
The Singer Company
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