Method and device for starting the operation of a friction spinning machine

Abstract

Method for starting the operation of a friction spinning machine, including friction surfaces movable in opposing directions for forming a spinning wedge, a device for supplying fiber to the spinning wedge, a thread withdrawal device, at least one suction device acting on the spinning wedge during the spinning operation, a suction tube disposed at an end of the machine opposite the thread withdrawal device, and a suction air source connectible to the suction device and to the suction tube, which includes: stopping the fiber supply and the motion of the friction surfaces; disconnecting the suction device from the suction source; supplying suction air from the suction source through the suction tube at the spinning wedge for inserting a thread into the spinning wedge; keeping the thread in a tensioned condition in vicinity of the spinning wedge; operating the suction device with a given suction power; moving the friction surfaces around the thread with a given speed to remove the twist of the thread at a given location; breaking the thread with tension at the given location severing a piece of thread; sucking the severed piece of thread into the suction tube; resuming the fiber supply at a given rate; moving the friction surfaces in opposing directions at a pre-determined speed greater than the given speed; and resuming a normal state of the machine for the spinning operation by supplying the fiber at a rate greater than the given rate, increasing the suction power of the suction device beyond the given suction power, increasing the speed of motion of the friction surfaces to a speed above the predetermined speed, and increasing the thread withdrawal speed.

Dependencies are inferred from the claim text.