Sewing – Work manipulating – Guides
Patent
1979-03-08
1981-06-09
Nerbun, Peter P.
Sewing
Work manipulating
Guides
D05B 302
Patent
active
042717736
ABSTRACT:
A pulse motor rotation phase adjusting system for a sewing machine includes a pulse motor operative for positioning a needle of the sewing machine in accordance with the predetermined stitch coordinates of a selected pattern. The pulse motor is adapted to be set to one of the stepping rotation phases in dependence upon the predetermined combinations of the magnetic forces generated by the windings of the pulse motor. A light interrupting arrangement is provided in the system which is connected to the output shaft of the pulse motor and serves for detecting the respective rotation phases of the pulse motor within a range of the maximum needle swinging amplitude and to produce a signal corresponding to predetermined combination of the magnetic forces, which signal is read out by a control circuit operatively connected to the pulse motor to rotate and reset the same to its initial position in accordance with said predetermined stitch coordinates when the electric power is applied to the sewing machine.
REFERENCES:
patent: 3970016 (1976-07-01), Yanikoski
patent: 4006391 (1977-02-01), Deering et al.
patent: 4131075 (1978-12-01), Wurst
Kakinuma Toshihide
Kume Toshiaki
Makabe Hachiro
Takenoya Hideaki
Watanabe Kazuo
Janome Sewing Machine Co. Ltd.
Nerbun Peter P.
Striker Michael J.
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