Workstation of a textile machine and method for monitoring the thread run of a running thread at a workstation of a textile machine

Abstract

A method for monitoring the thread run at a workstation of a textile machine having a thread feeding device for supplying a thread, a traversing device for traversing the supplied thread, a thread winding device for winding the traversed thread onto a run-on bobbin, a pneumatic thread storage, a thread storage unit with a thread guide arm pivotably mounted about a pivot axis, a controllable drive unit for reversible pivoting of the thread guide arm, and a sensor unit collecting sensor information about a thread tension acting on the thread guide arm and/or a position of the thread guide arm, and transmitting the sensor information to a control system associated with the workstation. The thread storage unit is arranged at the workstation such that the control system detects a thread breakage and/or an emptied pneumatic thread storage on the basis of the transmitted sensor information.

1 . A workstation of a textile machine comprising:
 a thread feeding device for supplying a thread;   a traversing device for traversing the supplied thread;   a thread winding device for winding the traversed thread onto a run-on bobbin;   a pneumatic thread storage;   a thread storage unit having a thread guide arm pivotably mounted about a pivot axis;   a controllable drive unit for reversible pivoting of the thread guide arm; and   a sensor unit which is designed and arranged for collecting sensor information about a thread force acting on the thread guide arm, a rotational movement and/or position of the thread guide arm, and for transmitting the sensor information to a control system associated with the workstation;   wherein the thread storage unit is arranged at the workstation such that the control system detects a thread breakage and/or the thread storage unit being empty based on the sensor information.   
     
     
         2 . The workstation according to  claim 1 , wherein the control system is designed to deactivate a suction air flow operating the thread storage unit and/or to interrupt a working process taking place at the workstation. 
     
     
         3 . The workstation according to  claim 1 , wherein the sensor unit has an incremental encoder for collecting the sensor information about the thread force acting on the thread guide arm and/or the position of the thread guide arm. 
     
     
         4 . The workstation according to  claim 1 , wherein the control system is designed to control the controllable drive unit for regulating a thread tension of the thread and/or a storage quantity of the thread. 
     
     
         5 . The workstation according to  claim 1 , wherein:
 the thread guide arm is mounted so as to be freely rotatable and has a first magnetic coupling element arranged at a distance from the pivot axis;   the controllable drive unit has a second magnetic coupling element arranged so as to be adjustable relative to the first magnetic coupling element and acts in a magnetically repelling manner on the first magnetic coupling element and which is arranged on the drive unit so the second magnetic coupling element can be brought into operative connection with the first magnetic coupling element; and   an adjustment of the second magnetic coupling element in a direction of the first magnetic coupling element causes a displacement of the first magnetic coupling element in the same direction.   
     
     
         6 . The workstation according to  claim 5 , wherein the second magnetic coupling element is arranged on a support which can be adjusted coaxially about the pivot axis of the thread guide arm by the drive unit. 
     
     
         7 . The workstation according to  claim 6 , wherein the drive unit has an electric motor with a drive shaft which is connected to the support in a rotationally fixed manner and on which the thread guide arm is mounted so as to be freely rotatable. 
     
     
         8 . The workstation according to claim  76 , wherein the support is arranged on a coupling disc arranged coaxially to the drive shaft and connected to the drive shaft in a rotationally fixed manner. 
     
     
         9 . The workstation according to  claim 6 , characterized in that the first magnetic coupling element is removably fastened to the thread guide arm. 
     
     
         10 . The workstation according to  claim 6 , wherein the first magnetic coupling element and the second magnetic coupling element are designed as permanent magnets. 
     
     
         11 . A method for monitoring a thread run of a running thread at the workstation of the textile machine according to  claim 1 , wherein the sensor unit transmits the sensor information about the thread force acting on the thread guide arm, and the rotational movement and/or position of the thread guide arm to the control system associated with the workstation, and wherein the control system evaluates the sensor information, and in the event of:
 a detected thread breakage, interrupts a working process at the workstation; and/or   the thread storage unit being detected as being empty, deactivates a suction air flow operating the thread storage unit.