Yarn supply apparatus with electronic yarn tension control, part

Details Yarn supply apparatus with electronic yarn tension control, part Yarn supply apparatus with electronic yarn tension control, part

1987-08-10

1988-06-21

Gilreath, Stanley N.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

66125R, 66132R, 66146, 242 45, 242 47, 242 54R, B65H 5120, B65H 5130

Patent

active

047520442

ABSTRACT:
A yarn supply element (5, 150) that supplies the yarn substantially without slip and is rotatably supported has yarn guide elements (14, 15, 16; 158) and is coupled to an electric motor (3) of regulated frequency that drives it. In the yarn travel path following the yarn supply element, there are yarn tension sensing means (21) that monitor the yarn (17) unwinding from the yarn supply element and that emit and electrical signal that is supplied to a control circuit (52), which supplies the motor with a frequency signal. To assure satisfactory yarn supply even in the event of abrupt changes in yarn utilization, a device (21, 19) for forming a yarn reserve is provided along the yarn travel path following the yarn supply element. The size of the yarn reserve is dimensioned to be sufficient to cover the yarn requirement during start up of the motor. Associated with this device are means (28, 50-55) for automatically refilling the yarn reserve to an original size no later than after the startup of the motor. Furthermore the control circuit also has a circuit arrangement (63) which at least during the startup of the motor limits the variation over time of the frequency of the frequency signal (53) in such a manner that the loaded motor is capable of following up the change in frequency.

REFERENCES:
patent: 2938365 (1960-05-01), Lassiter
patent: 3083924 (1963-04-01), Vossen et al.
patent: 3093330 (1963-06-01), Schmidt
patent: 3677036 (1972-07-01), Hatay
patent: 3858416 (1975-01-01), White et al.
patent: 3962891 (1976-06-01), Rouzaud
patent: 4673139 (1987-06-01), Memminger et al.
patent: 4706476 (1987-11-01), Memminger et al.

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