Method of regulating warp yarn tension in a weaving machine

DETAILED DESCRIPTION It is an object of the present invention, therefore, to provide a method of warp yarn regulating in a weaving machine, the use of which can prevent formation of fabric defects such as weaving bar as are produced by irregular warp yarn tension due to reversed operation of the loom.
It is another object of the invention to provide a method of warp yarn regulating which can permit restarting of the loom with no troublesome procedure associated with adjustment of the rate at which the warp yarns are delivered from a warp beam and of the cloth fell position.
In an embodiment of the method according to the invention contemplated to achieve the above objects, variation of warp yarn tension from a reference value corresponding to an optimum tension is detected by a tension roller which is movable with a change in the tension, and the rate at which the warp yarns are unwound from the warp beam is controlled by a speed reducer whose variable speed reduction ratio is adjusted depending upon the extent and direction of the movement of the tension roller; i.
e.
, said rate is controlled in such a way that it is decelerated with a decrease of the warp yarn tension or accelerated with an increase thereof so that the warp yarns are regulated properly within a permissible range of tension.
When the loom is operated in its reverse direction and the warp beam is also reversed to rewind the warp yarns thereon, however, controlling of the rate at which the warp yarns are rewound on the warp beam is made in an opposite way as compared with the controlling of the rate of unwinding in the above-mentioned normal forward operation of the weaving machine, i.
e.
, the rate of rewinding is decelerated with an increase of the warp yarn tension while it is accelerated with a decrease thereof so that the warp yarn tension may be regulated properly during the reversing rotation of the loom.
The above and other objects, advantages and features of the present invention will become more readily apparent to those skilled in the art from the following detailed description of a preferred embodiment according thereto, taken in conjunction with the accompanying drawings, wherein: