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US 4,067,275 AGranted
Device for sewing machines for displacing sewn material for a short period of time
AssigneePfaff Industriemaschinen GmbH
InventorErich Willenbacher
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AssigneePfaff Industriemaschinen GmbH
InventorErich Willenbacher
Estimating the term…
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.
A device for displacing sewn material for use with a sewing machine, comprising a shifting foot, a linkage connected to said foot, means for supporting said linkage adjacent the sewing machine, foot lifting drive means connected to said linkage to raise and lower said foot to move it out of and into engagement with the material, foot shifting drive means connected to said linkage to shift said foot relative to the material feed direction, said foot shifting drive means including a movable member, a lost motion connection between said movable member and said linkage for displacing said linkage with said shifting foot while permitting said foot to give way and adjustable stop means for limiting the displacement of said shifting foot.
Dependencies are inferred from the claim text.