Textiles: weaving – Weft manipulation – Weaving with stationary weft supply
Patent
1997-06-03
1998-08-25
Falik, Andy
Textiles: weaving
Weft manipulation
Weaving with stationary weft supply
139 1E, D03D 4718, D03D 5100
Patent
active
057974330
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an improvement made to weaving machines and, more particularly, to a new way of ensuring drive and synchronization between the various means which the machine comprises, in order to produce a fabric.
In the rest of the description, the invention will be described with regard to a weaving machine, in which the insertion of the weft is carried out by means of two grippers introduced simultaneously into the shed from each side of the machine, one gripper serving for delivering the weft yarn, taken from a bobbin located on one side of the machine, as far as the middle of the width of the latter, where there is then a transfer to the second gripper which, during its retraction, delivers the yarn on the side opposite to the feed side, the displacements of the said grippers within the shed being ensured by an assembly commonly referred to by the expression "rapier or flexible band".
It is clear that this is not limiting, and that the invention could equally be used for other types of weaving machine employing means other than positive grippers for ensuring the insertion of the weft.
The production of a fabric involves: formation of the shed and the winding-up of the fabric produced, and; beating it up against the last pick made by means of a reed carried by a batten.
Hitherto, for executing the control and synchronization of the various elements which make it possible to carry out these operations, weaving machines have comprised a single motor which, by means of a clutch/brake assembly, drives in rotation a driveshaft, known as a "main shaft", which extends over the entire width of the machine and from which mechanical connections make it possible to ensure that the various members of the machine are driven in synchronism.
From a practical point of view, such a concept is satisfactory, but it nevertheless has the disadvantages that it requires a high-power motor capable of transmitting a high torque which, as an indication, is of the order of 70 m.kg for a weaving machine which makes it possible to obtain articles having a width of 2 to 4 meters and which rotates at a speed of 400 to 500 strokes per minute.
Moreover, the transmission of movement to the various members (warp-yarn beam, winding-up system, advance and retraction of the insertion grippers, control of the batten) utilizing mechanical transmissions appreciably complicates the structure of these machines.
A solution making it possible to solve all these problems has been found, this being the subject of the present invention.
SUMMARY OF THE INVENTION
In general terms, therefore, the invention relates to an improvement made to weaving machines, in which the insertion of the weft is carried out by means of two grippers introduced simultaneously into the shed from each side of the machine, one gripper serving for delivering the weft yarn, taken from a bobbin located on one side of the machine, as far as the middle of the width of the latter, where there is then a transfer to the second gripper which, during its retraction, delivers the yarn on the side opposite to the feed side, the pick put in place subsequently being beaten up against the last pick of the fabric by means of a reed carried by a batten.
The invention is characterized in that the control of the weft insertion means and of the batten is carried out by means of two electric motors arranged on each side of the machine: the batten-carrying housing located on the same side as the said motor; frequency converters and being connected to one another by synchronizing means; such synchronizing means consist in a simple way of a rigid connection connecting the two machine shafts to one another.
Although it is possible to consider ensuring the control of the warp unwinder and of the fabric winder, on the one hand, and of the displacement of the frames ensuring the formation of the shed, on the other hand, by means of mechanical connections with the two abovementioned driveshafts, according to a preferred embodiment of the invention each
REFERENCES:
patent: 5158119 (1992-10-01), Pezzoli et al.
patent: 5276627 (1994-01-01), Makino et al.
patent: 5502231 (1996-03-01), Bassing
patent: 5642757 (1997-07-01), Froment et al.
Falik Andy
ICBT Diederichs
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