Sewing – Special machines – Darning
Patent
1982-03-02
1984-09-11
Feldbaum, Ronald
Sewing
Special machines
Darning
112315, D05B 300
Patent
active
044703619
ABSTRACT:
Railway sewing apparatus is disclosed for sewing and piecing together the free ends of two separate sheets of fabric which includes a frame 10 on which a horizontally extending rail A is carried. A sewing unit B is carried for horizontal movement back and forth across the rail and a sewing machine 50 is carried by the sewing unit. A D.C. drive motor 76 and rack and pinion gear drive 18, 82 impart a drive motion for driving the sewing unit B across rail A when energized. Means for driving the sewing machine 50 at a constant sewing speed is provided by a separate A.C. motor 44. An electrical control circuit 100 provides a variable output responsive to the position of the sewing unit on the rail energizing the drive motor as sensed by cams 36, 38 and switches 92, 94. The drive control has a first output at 128 energizing the drive motor means at a first, low drive speed over a first portion of the rail and a second output at 128 energizing the drive motor at a second, high drive speed over a second portion of the rail. Thus, a greater number of stitches per inch is sewn in the fabric positioned over the first portion of the rail than the number of stitches in the fabric positioned over the second portion of the rail.
REFERENCES:
patent: 2593196 (1952-04-01), Rotherham
patent: 2724352 (1955-11-01), Gentry et al.
patent: 2836133 (1958-05-01), Gamble et al.
patent: 2836135 (1958-05-01), Briggs
patent: 3396686 (1968-08-01), Davidson et al.
patent: 3750603 (1973-08-01), Martin
patent: 4242974 (1981-01-01), Beckerman
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