Method and device for heating a rotatably mounted guide casing of a guide roller

Abstract

The invention relates to a method and a device for heating rotatably mounted guide casing of a guide roller for guiding and heating threads. The guide roller has a guide casing which is held on the circumference of an axle support by means of an air bearing. To heat the guide casing, compressed air is heated outside the guide roller and supplied to the air bearing within the guide roller.

1 . Method for heating a rotatably mounted guide casing of a guide roller for guiding and heating threads, in which the guide casing is held on the circumference of an axle support by means of an air bearing, comprising:
 heating compressed air outside the guide roller, and   supplying the heated compressed air to the air bearing for the guide casing.   
     
     
         2 . Method according to  claim 1  wherein heating includes:
 receiving, in a separate compressed air heater, compressed air from a compressed air source, and 
 applying heat to the compressed air while the compressed air is in the separate compressed air heater. 
 
     
     
         3 . Method according to  claim 1  wherein the compressed air is heated to a setpoint temperature, an actual temperature of the compressed air is detected, and the heating of the compressed air is regulated as a function of a deviation between the setpoint temperature and the actual temperature. 
     
     
         4 . Method according to  claim 1  wherein supplying the heated compressed air includes:
 distributing the heated compressed air within the guide roller by means of a porous sliding casing in an air gap of the air bearing. 
 
     
     
         5 . Method according to  claim 1  wherein supplying the heated compressed air includes:
 distributing the heated compressed air within the guide roller in an air gap of the air bearing via multiple nozzle holes. 
 
     
     
         6 . Device, comprising:
 a guide roller which has a rotatably mounted guide casing and an axle support, an air bearing being provided between the guide casing and the axle support,   a compressed air source,   a compressed air line, which couples the compressed air source to the air bearing, and   a heating means to heat compressed air associated with the compressed air line, the heating means being disposed outside the guide roller.   
     
     
         7 . Device according to  claim 6  wherein the heating means is formed by an electric compressed air heater which is connected in the compressed air line between the compressed air source and a compressed air connection for the guide roller. 
     
     
         8 . Device according to  claim 6 , further comprising:
 a heat control system, and   a temperature sensor for detecting an actual temperature of the heated compressed air, the heat control system and the temperature sensor being associated with the heating means.   
     
     
         9 . Device according to  claim 7  wherein the air bearing is formed by an air gap between the guide casing and a porous sliding casing, the porous sliding casing being held at the circumference of the axle support, at which at least one annular chamber which is connected to the compressed air connection is provided. 
     
     
         10 . Device according to  claim 9 , wherein the porous sliding casing is formed from an open-pore sintered metal or sintering coal. 
     
     
         11 . Device according to  claim 7  wherein the air bearing is formed by an air gap between the guide casing and the axle support, the axle support having multiple nozzle openings at the circumference which are connected to the compressed air connection and which open into the air gap. 
     
     
         12 . Device according to  claim 6  wherein the guide casing has a hollow cylindrical design and has a thrust ring at each of the two ends, the thrust rings being connected to the guide casing in a rotationally fixed manner and delimiting the air gap of the air bearing toward both end faces. 
     
     
         13 . A method of operating a melt spinning device, including (i) a guide roller which has a rotatably mounted guide casing and an axle support, an air bearing being provided between the guide casing and the axle support, (ii) a compressed air source, (iii) a compressed air line which couples the compressed air source to the air bearing, and (iv) a heating means to heat compressed air associated with the compressed air line, the heating means being disposed outside the guide roller, the method comprising:
 guiding, heating and stretching one or more threads through multiple godets, at least one of the godets cooperating with the guide roller to guide the thread.   
     
     
         14 . Method according to  claim 13  wherein a godet casing of one of the godets and the guide casing of the guide roller are heated to the same surface temperature.