In the air-jet or water-jet machines, we should better speak of thread length pre-measuring devices, as the feeder has the task of winding on its own drum a thread length which corresponds exactly to an insertion. In modern pre-measuring devices, the thread length wound on the drum is controlled by optoelectronic sensors.
The feeders are supplied together with various outfits and adjustment possibilities, which vary according to the yarn type and count and to the insertion system used. Each of them is equipped with an independent motor, which speed can be modified within a wide range of values. The feeders can also be connected with the driving unit of the weaving machine and interact with it. Their general structure is presented in the scheme as per figure the thread is taken off from the cone by a thread guide 1 composed of an eyelet obtained on a ring which is put in rotation by an electric motor M. The thread guide winds the thread on a drum 2, consisting of a series of fixed segments alternated with a series of oscillating segments. These segments, through their movement, move the coils forward along the surface, positioning them in a regular way and keeping them separated one from the other.
At the moment of the insertion, the thread unwinds from the drum with a torsional movement opposite to the winding movement, passing through a braking system 3 which has the task of bringing the thread tension to the desired value and of maintaining it constant, and finally through another thread guide 4. A photocell system or any other system, suitably adjusted, will bring about the length of the thread reserve which is wound on the feeder’s drum.
Textile Weaving Machines | Piotex Textile Marketing Company
Piotex deals with the Textile Weaving Machines and it is used for combining warp and weft components to make a woven structure and to hold the warp threads.
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Nice Drawing,weft storage feeders or weft accumulators