Workpiece holding-down device in a sewing machine

Details Workpiece holding-down device in a sewing machine Workpiece holding-down device in a sewing machine

1984-11-13

1986-05-13

Schroeder, Werner H.

Sewing

Elements

Presser devices

112311, D05B 2902

Patent

active

045879117

ABSTRACT:
A sewing machine with a workpiece holding-down device comprises an arm movable between an upper position and a lower position and normally biased to the upper position. An auxiliary workpiece holding-down member is movable between an upper position and a lower position in synchronization with the rotation of a main shaft and is normally biased to the upper position. A disengageable interconnecting means is interposed between the main shaft and auxiliary holding-down member. Electromagnetic means is energized upon starting of a sewing operation and is deenergized upon the completion of formation of a seam. An operation means is operable in response to energization of the electromagnetic means to impart an operative force to the auxiliary holding-down member and a holding-down arm and releases the operative force in response to the deenergization of the electromagnetic means.

REFERENCES:
patent: 2970557 (1961-02-01), Schwab et al.
patent: 4214543 (1980-07-01), Garron et al.

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