Method and apparatus for a joint start-up and stopping of the spinning positions of an open-end spinning machine
AssigneeRieter Machine Works, Ltd.
InventorAndre Lattion
Life of this patent
Estimating the term…
Abstract
The start-stop program for the open-end spinning machine causes the external suction means to be rendered ineffective during the stopping process before the rotor falls below a speed necessary to maintain tension in the fiber ring in the fiber collecting groove of the rotor. Also, the program causes the external suction means to be effective on the rotor during a start-up only after the rotor has reached a speed sufficient to maintain the fiber ring tensioned in the collecting groove.
Claims8
An open-end spinning machine comprising
- at least one spinning position having a rotatable rotor therein for spinning fiber into yarn;
- a fiber sliver feed means for delivering sliver to said spinning position;
- a fiber opening means for opening the fiber delivered to said spinning position;
- a plurality of yarn take-off rolls for removing yarn from said spinning position;
- an external suction means in communication with said spinning position for subjecting said position to a vacuum;
- and
- a control means connected to each of said rotor feed means, opening means, take-off rolls, and suction means for selectively activating and deactivating each of said rotor, feed means, opening means, take-off rolls and suction means, wherein said suction means is activated during a start-up of the machine as a function of rotor speed and is deactivated during stopping of the machine as a function of rotor speed.
A method of joint starting and stopping an open-end spinning machine having a plurality of spinning positions, each said spinning position having a rotatable rotor therein containing a fiber collecting groove for spinning fiber into yarn and each said spinning position being in communicaion with an external suction means for subjecting said position to a vacuum, means for delivering fibers to said rotor and means for taking-off yarn from said rotor;
- said method comprising the steps of
- rendering said vacuum ineffective within said rotor during stopping of a spinning process and before said rotor falls below a rotational speed of a first minimal value required to maintain tension in a fiber ring in said groove, and
- subjecting said rotor to said vacuum after said rotor has exceeded a rotational speed of a second minimum value sufficient to maintain a fiber ring tensioned in said groove during start-up of the machine.
Dependencies are inferred from the claim text.