Sewing – With tables or stands – For plural sewing units
Patent
1976-12-07
1978-01-10
Krizmanich, George H.
Sewing
With tables or stands
For plural sewing units
112239, D05B 2704
Patent
active
040672751
ABSTRACT:
A device for sewing machines for displacing sewn material for a short period of time, comprises a shifting foot which is mounted on a bracket on the main frame of the sewing machine with a parallel linkage. A foot raising and lowering drive mechanism is also mounted on the frame, and it comprises a piston and cylinder combination connected to the linkage for raising the foot upwardly and downwardly. In addition, a foot shifting mechanism is supported on a plate forming a part of the linkage and it includes a piston and cylinder combination which is connected to a lever arm portion of the linkage. The connection includes a piston rod forked end having a small pin which rides in a large diameter bore of the lever arm so as to provide a lost motion for yielding of the shifting foot with the material at times. The lever arm is urged against the pin by a spring which may be adjusted along with end positions of the piston rod.
REFERENCES:
patent: 3099974 (1963-08-01), Chudner
patent: 3437062 (1969-04-01), Hacklander
patent: 3483835 (1969-12-01), Krnac et al.
patent: 3540391 (1970-11-01), Haye
patent: 3688712 (1972-09-01), Edwards
patent: 3954071 (1976-05-01), Mall et al.
Krizmanich George H.
Pfaff Industriemaschinen GmbH
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