Sewing – Stitch forming – Feeding work material
Patent
1986-11-24
1987-09-29
Nerbun, Peter
Sewing
Stitch forming
Feeding work material
112456, D05B 2722
Patent
active
046962476
ABSTRACT:
A feed device drives a feed dog directly by a stepping motor having a predetermined number P of excitation modes, and devised so that the output shaft thereof is turned by a unit amount S when the excitation mode is changed over. A stopper is disposed so as to define the range of the horizontal feed motion of the feed dog. An excitation control means excites the stepping motor in a specific excitation mode at the start or at the end of horizontal feed operation. The specific excitation mode is one of the excitation modes in which the stepping motor is excited while the output shaft thereof is turned by an amount P.multidot.S/2 from a position where the output shaft of the stepping motor is restrained from rotation by the stopper. When the step-out of the stepping motor occurs due to an excessive load acting through the feed dog on the stepping motor during stitching operation, the output shaft of the stepping motor is held at a predetermined angular position by the stopper, and then the stepping motor is excited in the specific excitation mode to restore the stepping motor to synchronism from step-out. Thus, the deformation of the pattern is limited to the least extent.
REFERENCES:
patent: 4236469 (1980-12-01), Takenoya et al.
patent: 4286532 (1981-09-01), Tonomura
patent: 4625667 (1986-12-01), Hammermann
Brother Kogyo Kabushiki Kaisha
Nerbun Peter
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