Controlled starting and stopping of tufting machines

Details Controlled starting and stopping of tufting machines Controlled starting and stopping of tufting machines

1989-08-16

1990-01-23

Hunter, H. Hampton

Sewing

Special machines

Embroidering

112275, 112 804, D05C 1520, D05B 6910

Patent

active

048950874

ABSTRACT:
A tufting machine having a mainshaft rotatably driven by one or more A.C. motors reciprocably drives a needle bar carrying a multiplicity of needles. Two brakes are associated with the shaft, the first brake being actuated when the motors are deenergized, and the second brake is actuated after the speed of the shaft has been reduced to a predetermined speed which permits the shaft to be stopped with the needle bar and the needles at the top of the reciprocating stroke. The motors may also be gradually started so that attainment of full speed is not reached until after the expiration of a predetermined time interval. Thus, "stop marks" may be substantially eliminated.

REFERENCES:
patent: 3221683 (1965-12-01), Abelsma
patent: 3529560 (1970-09-01), Jackson
patent: 3753061 (1973-08-01), Owens
patent: 3800718 (1974-04-01), Johnson
patent: 3967566 (1976-07-01), Spiegel et al.
patent: 4010700 (1977-03-01), Webb
patent: 4151805 (1979-05-01), Long et al.
patent: 4586446 (1986-05-01), Cooper
patent: 4707643 (1987-11-01), Rohr et al.
patent: 4714039 (1987-12-01), Shimada
patent: 4765267 (1988-08-01), Nakamura

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