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US 4,067,271 AGranted
Workpiece guiding device for sewing machines
AssigneePfaff Industriemaschinen GmbH
InventorsEugen Angele, Erich Willenbacher
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AssigneePfaff Industriemaschinen GmbH
InventorsEugen Angele, Erich Willenbacher
Estimating the term…
A guiding device for sewing machines which have means for feeding cloth of workpieces into association with a moving needle in a stitch forming area for effecting edge parallel seams, comprises a support table with a bottom plate supported on the table and having at least a portion spaced above the table and defining a cloth layer feed space and with a top plate overlying at least a portion of the bottom plate and spaced above it and defining a workpiece layer passageway therebetween. The top plate has a pressure point which may be urged toward a complementary point on the bottom plate at a location spaced from the stitch forming area. A plurality of pins supported on the bottom plate and extending upwardly through the top plate are arranged to extend laterally and in an acute angle to a line extending in the workpiece feed direction. A spring is arranged to bear downwardly on the top plate and adjustment means for varying the spacing between the top and bottom plate and the clamping effect of the top plate over the bottom plate is supported on the bottom plate and has means bearing on the spring which may be shifted in order to vary the effect of biasing force thereof and the spacing between the top and bottom plate.
A guiding device for sewing machines having means for feeding cloth workpieces into association with a moving needle in a stitch forming area for effecting edge parallel seams, comprising a support table, a bottom plate supported on said support table, a top plate overlying said bottom plate and defining a workpiece layer passageway therebetween and having a pressure point at a spaced location from the stitch forming area, means defining a ruler between said top and bottom plates in said workpiece layer passageway and extending laterally at an acute angle to a line extending in the workpiece feed direction, spring means bearing downwardly on said top plate, and adjustment means carried on said table and operatively associated with said spring means and said top plate to vary both the effect of biasing force thereof and the spacing between said top and bottom plates.
A guiding device for sewing machines having means for feeding cloth workpieces into association with a moving needle in a stitch forming area for effecting edge parallel seams, comprising a support table, a bottom plate supported on said support table, a top plate overlying said bottom plate and defining a workpiece layer passageway therebetween and having a pressure point at a spaced location from the stitch forming area, means defining a ruler between said top and bottom plates in said workpiece layer passageway and extending laterally at an acute angle to a line extending in the workpiece feed direction, spring means bearing downwardly on said top plate, adjustment means carried on said table and operatively assciated with said spring means to vary the effect of biasing force thereof and the spacing between said top and bottom plates, wherein said spring means comprises a leaf spring having one end bearing on said top plate and an opposite end, means supporting said opposite end above said bottom plate, said adjustment means comprising an eccentric engageable with said spring intermediate its length to vary the force acting on said spring.
A guiding device for sewing machines having means for feeding cloth workpieces into association with a moving needle in a stitch forming area in order to form edge parallel seams on the workpiece, comprising a support table, a bottom plate mounted on said support table, a top plate overlying said bottom plate and having at least a portion spaced above said bottom plate and defining a workpiece layer passageway between said top and bottom plates and having a pressure point at a spaced location from the stitch forming area, a spring secured to said table and having a contact portion bearing downwardly on said top plate, and an adjustable clamping member mounted on said table and engageable with said spring and said top plate simultaneously to vary the biasing force of said spring and the spacing between said top and bottom plates.
A guiding device for sewing machines having means for feeding cloth workpieces into association with a moving needle in a stitch forming area in order to form edge parallel seams on the workpiece, comprising a support table, a bottom plate mounted on said support table, a top plate overlying said bottom plate and having at least a portion spaced above said bottom plate and defining a workpiece layer passageway between said top and bottom plates and having a pressure point at a spaced location from the stitch forming area, a spring secured to said table and having a contact portion bearing downwardly on said top plate, and an adjustable clamping member mounted on said table and engageable with said spring and said top plate simultaneously to vary the biasing force of said spring and the spacing between said top and bottom plates, including a wedge member movable mounted on said top plate and having a wedging surface tapering downwardly toward said top plate, a leaf spring having an end bearing downwardly on said top plate, and means mounting said spring on said support table over said top plate.
Dependencies are inferred from the claim text.