Sewing machine

Details Sewing machine Sewing machine

1981-05-04

1983-05-03

Hunter, H. Hampton

Sewing

Elements

Presser devices

112256, D05B 2902, D05B 7100

Patent

active

043817220

ABSTRACT:
In a sewing machine having a presser foot and a pressure imparting member for applying a downward pressure to the presser foot, there is disposed, in an inner chamber of a frame, an oil pump drivingly connected to a main shaft. The oil pump having an inlet port for drawing the oil from an oil reservoir and an outlet port for deliverying the oil under the pressure corresponding to the speed of the main shaft. Also a presser actuating device is provided between the oil pump and the presser foot and designed to apply an additional downward pressure to the presser foot by means of the oil from the outlet port so as to increase the downward pressure of the presser foot.

REFERENCES:
patent: 2541888 (1951-02-01), Pinkvoss
patent: 2750908 (1956-06-01), Odermann et al.

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