Upper feed dog device

Details Upper feed dog device Upper feed dog device

1981-11-09

1983-12-20

Schroeder, Werner H.

Sewing

Stitch forming

Feeding work material

D05B 2706

Patent

active

044210477

ABSTRACT:
An upper feed dog for sewing machines carried by an actuating arm pivotably mounted on a support fixed to the upper surface of the main feed bar that carries the main lower feed dog. A control arm has one end pivotably connected to the same pivot as the actuating arm and its opposite end is pivotably connected to a guide block carried in one end of a double-forked lever. The opposite end of this lever is operatively associated with an oscillatably driven shaft, the motion of which is transmitted to the actuating arm by a coil spring interposed between the latter arm and the control arm and is effective so as to cause pressure of the upper feed dog on a workpiece to be progressive and prevent direct impact between the control arm and the actuating arm, whereby the operating noise level of the machine operating at high speed is greatly reduced.

REFERENCES:
patent: 4199995 (1980-04-01), Murakami
patent: 4285294 (1981-08-01), Aida
patent: 4295434 (1981-10-01), Hsiao

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