Pile loom

Abstract

There is provided an apparatus capable of maintaining a pile warp tension at a desired value even under a high speed operation of a pile loom in a pile warp tension controller of the pile loom. The pile warp tension controller controls a biasing force relative to a tension roller in synchronization with a relative motion between a reed and a woven cloth which is performed in correspondence with a pile formation, and also controls the biasing force relative to the a tension roller so as to apply a tension in a prescribed period including at least a beating time for pile formation within a period where the relative motion is performed, which tension is lower than an applied tension in a period other than the period where the relative motion is performed, and the tension roller is elastically deformable in the range of a winding of the pile warp.

What is claimed is:  
     
         1 . A pile loom comprising an electromotive actuator for driving a tension roller relative to a pile warp and a pile warp tension controller for controlling the driving of the electromotive actuator in correspondence with pile weaving, 
 wherein the tension roller is elastically deformable in the range of winding of the pile warp.    
     
     
         2 . The pile loom according to  claim 1 , wherein the pile warp tension controller torque drives the electromotive actuator in response to a torque command value which is set in correspondence with an applied tension.  
     
     
         3 . The pile loom according to  claim 1 , wherein the pile warp tension is structured such that the electromotive actuator undergoes selectively either a torque control or a positional control, a position command value for executing the positional control during a period when a relative motion between a reed and a woven cloth is performed for pile weaving and a torque command value corresponding to the applied tension for executing the torque control during a period other than the period when the relative motion is performed are respectively set in the pile warp tension controller, and wherein the pile warp tension controller selects the corresponding command values or controls to drive the electromotive actuator when periods of the relative motion between the reed and woven cloth are switched therebetween.  
     
     
         4 . The pile loom according to  claim 2 , wherein the command value for applying a tension, which is lower than a tension applied during a second period other than a first period, is set in the pile warp tension controller during the first period which is determined to include at least a beating time for forming a pile within a period when the relative motion between the reed and woven cloth is performed for pile weaving, and wherein the pile warp tension controller selects the corresponding torque command value to torque drive the electromotive actuator when periods of relative motion between the reed and woven cloth are switched therebetween.  
     
     
         5 . The pile loom according to  claim 3 , wherein the positional command value during the first period which is determined to include at least the beating time for forming a pile within a period when the relative motion between the reed and woven cloth for pile weaving is performed is set in the pile warp tension controller at a value to reduce the applied tension during the second period owing to the cooperation with the relative motion between the reed and woven cloth.  
     
     
         6 . The pile loom according to  claim 1 , wherein a positional command value for reducing the tension variation of the pile warp caused by the relative motion between the reed and woven cloth for pile weaving is set in the pile warp tension controller, and the pile warp tension controller performs a positional control of the electromotive actuator in response to the positional command value.  
     
     
         7 . A pile loom comprising support means, for displaceably supporting a tension roller relative to a pile warp, and driving mechanisms connected to a main shaft of the pile loom for swingably driving the support means, in correspondence with the relative motion between the reed and the woven cloth which is performed in correspondence with a pile weaving, wherein the tension roller is elastically deformed in the range of winding of the pile warp.  
     
     
         8 . The pile loom according to any of  claims 1  to  7 , wherein the tension roller is formed of a leaf spring which is extended in a weaving width direction and curved in correspondence with a warp path.