Method for piecing a thread on open-end spinning units
AssigneesFritz Stahlecker, Hans Stahlecker
InventorFritz Stahlecker
Life of this patent
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Abstract
In piecing a thread, it is important for each piecing operation to be performed under uniform conditions. In order to provide uniform conditions for the area of the fibre feed, the fibre tuft offered to the opening means is trimmed in a certain manner, which is then the same for every piecing operation, before the sliver feed is switched on.
Claims18
A method for piecing a thread on open-end spinning units, in which a thread is returned to a spinning rotor, placed on a ring of fibres deposited in said spinning rotor, and then drawn off again, in which said ring of fibres is formed from fibres removed from an opened sliver, with said sliver being offered to opening means by feed means in the form of a fibre tuft;
- further comprising:
- shortening of a fibre tuft to form predetermined short fibres with said feed means switched off,
- switching said feed means on for producing a ring of shortened fibres in said spinning rotor,
- wherein the spinning rotor runs up from its stopped condition to its operating speed during the piecing operation,
- wherein the thread is placed on the ring of fibres before said spinning rotor reaches said operating speed,
- and wherein a quantity of fibres are fed at a rate which is smaller than the feed rate of fibres fed during normal operation until said thread is placed on said ring of fibres.
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising:
- preparing shortened fibres,
- supplying said shortened fibres to said spinning rotor to form a ring of shortened fibres,
- returning a thread end to said ring of shortened fibres while rotating said spinning rotor to piece said thread end with said ring of shortened fibres,
- drawing off said thread,
- and supplying normal length fibres to said spinning rotor to form more thread following the piecing connection formed with said shortened ring of fibres,
- wherein said preparing and supplying of said shortened fibres are performed in a predetermined manner to form a predetermined configuration of said ring of shortened fibres, whereby uniform repetitive piecing operations are accommodated.
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising:
- shortening fibres of a fibre tuft being supplied by feeding means,
- performing a first stage switching of said feeding means to feed the shortened fibres to said spinning rotor as a starting ring of shortened fibres for piecing with a thread end to be returned to the spinning rotor,
- and performing a second stage switching of said feeding means to feed fibres of normal length which are longer than said shortened fibres to said spinning rotor after said first stage switching.
Dependencies are inferred from the claim text.