Back to results
US 4,777,791 AGranted
Method of shutting down a rotor spinning machine
AssigneeHollingsworth (U.K.) Limited
InventorsAlfred Wood, John Rothwell
Life of this patent
Estimating the term…
Abstract
The invention provides for the spinning units of a multi-position rotor spinning machine to be driven by a common AC drive motor powered by a static inverter enabling the power supply frequency to the AC motor to be controlled for controlling the rate of acceleration and the operating speed and the rate of deceleration of the AC drive motor. This facilitates a method of mass stopping.
Claims7
A method of shutting down a multi-position rotor spinning machine comprising progressively reducing the input frequency to AC drive means powering the various spinning units to a predetermined reduced operating speed;
- and on attainment of said predetermined reduced operating speed, stopping sliver feed to the various rotor spinning units;
- measuring the rotation of the yarn delivery rollers after the instant of stopping sliver feed to determine the length of yarn delivered;
- and braking the yarn delivery rollers to a standstill once a predetermined yarn length has been delivered following the stopping of the sliver feed;
- and including the step of deflecting the yarn delivery path to a tortuous configuration in which a yarn reserve loop is formed.
1 more element
Dependencies are inferred from the claim text.