Method and apparatus for the weft insertion in a jet weaving machine

A method for inserting weft threads in a jet weaving machine for weaving a cloth comprising drawing off a predeterminable length of a weft thread from a winding drum during each work cycle of the machine, inserting the weft thread into an open shed with a main nozzle which is fed with a transport medium, binding the weft thread into the cloth by changing the shed, severing the weft thread at an edge of the cloth near the main nozzle, and interrupting the drawing off of the weft thread to be inserted at least once during each work cycle by releasing at first a first predeterminable thread length to be drawn off the winding drum and thereafter releasing at least one further predeterminable thread length to be drawn off the winding drum.

An air jet weaving machine comprising a thread supply apparatus having a winding drum from which, in each work cycle, a weft thread of predeterminable length to be inserted can be drawn off, a main nozzle for the insertion of the weft thread into an open shed, it being possible for said main nozzle to be fed with a transport medium, a severing device for severing the weft thread at the cloth edge which is near the main nozzle, and a thread withdrawal device for interrupting the drawing off of the weft thread to be inserted at least once during each work cycle in such a manner that at first a first predeterminable thread length is released for the drawing off from the winding drum and then at least one further predeterminable thread length is released for drawing off from the winding drum.

A method for inserting weft threads in an air jet weaving machine for weaving a cloth comprising directing the weft thread with a flow of air into an open shed on the weaving machine during an operating cycle of the machine by drawing the weft thread off a weft thread supply, prior to commencing a new operating cycle changing the shed to thereby bind the inserted thread to the cloth, and interrupting the drawing off of the weft thread by first releasing a first predetermined length of the weft thread from the weft thread supply for insertion into the shed and thereafter releasing a further predetermined length of the weft thread from the weft thread supply.