Sewing – Special machines – Buttonhole
Patent
1989-03-01
1990-02-13
Hunter, H. Hampton
Sewing
Special machines
Buttonhole
112274, 112284, D05B 300, D05B 6926
Patent
active
048996734
ABSTRACT:
A control device for a cyclic sewing machine for controlling driving condition of a main shaft of a cyclically operated sewing machine. The control device includes a clutch mechanism provided between a driving source and a main shaft, a switching member for switching the clutch mechanism between a power cutoff condition, a low-speed drive condition and a high-speed drive condition, a control cam rotatable at a reduced speed in interlinked relation to the main shaft, and a lost-motion connecting means. When switch the sewing machine from the power cutoff condition to the low-speed condition, a lost-motion is produced between the operating member and the switching member. The control cam is rotated in response to rotation of the main shaft, the operating member and the switching member are moved in accordance with cam profile. The clutch mechanism and hence the main shaft are switched between the drive conditions based on the movement of the switching member.
REFERENCES:
patent: 3482535 (1969-12-01), Hayashi et al.
patent: 3693564 (1972-09-01), Hsiao
patent: 3705561 (1972-12-01), Sakawa et al.
patent: 3832961 (1974-09-01), Nakamura et al.
patent: 3859940 (1975-01-01), Nakamura
patent: 3894500 (1975-07-01), Hsiao
patent: 3908568 (1975-09-01), Fujii
patent: 4730565 (1988-03-01), Iizuka
Takahashi Akio
Yasuda Mamoru
Brother Kogyo Kabushiki Kaisha
Hunter H. Hampton
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