Work feed device in sewing machines

Details Work feed device in sewing machines Work feed device in sewing machines

1983-09-30

1984-09-04

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

112313, D05B 2702

Patent

active

044690398

ABSTRACT:
A work feed device for sewing machines, which comprises feed dog carrier bars performing an elliptical movement with the aid of two mechanisms; namely, an advancing mechanism and a raising mechanism. The advancing mechanism is composed of an oscillating shaft provided with arms, which in turn are connected to the feed dog support bars at the opposite end to that where the dogs are mounted. The raising mechanism comprises a support making a vertical reciprocating movement and which is provided with a horizontal guide along which the feed dog support bars are moved reciprocatingly by the advancing mechanism. Finally, vertical movement of the support comprises two connecting rods approximately parallel to one another. They are pivoted at one end to the said support and at the other end to a part connected to the frame of the sewing machine.

REFERENCES:
patent: 3611817 (1971-10-01), Smith
patent: 4027609 (1977-06-01), Kerr
patent: 4159004 (1979-06-01), Ross
patent: 4295434 (1981-10-01), Hsiao

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