Fleece-Laying Apparatus

Abstract

In a fleece layer of the carriage cross-lapper type, the laying carriage conveyor belt ( 14 ) wraps around the first laying roller ( 12 ), the upper and lower strands ( 14 o, 14 u ) of the belt being parallel to each other as they proceed from the first laying roller ( 12 ). An endless cover belt ( 23 ), which travels around in the laying carriage ( 5 ), wraps around the second laying roller ( 13 ), the cover belt having upper and lower strands ( 23 o, 23 u ), which are parallel to each other as they proceed from the second laying roller ( 13 ) in the direction opposite that of the laying carriage conveyor belt ( 14 ). The mutual distances between the web entrance ( 8, 9 ), the upper carriage ( 4 ), the laying carriage ( 5 ), and the output conveyor belt ( 2 ) perpendicular to the transport directions of same are so small that the card web ( 11 ) to be laid is enclosed in a sandwich-like manner between the adjacent strands of the web entrance conveyor belt ( 6 ), of the upper carriage conveyor belt ( 20 ), and of the laying carriage conveyor belt ( 14 ), where the laid fleece on the output conveyor belt ( 2 ) is contacted by the laying carriage conveyor belt ( 14 ) and by the cover belt ( 23 ).

1 . A fleece-laying apparatus of the carriage cross-lapper type, comprising:
 a stationary web entrance;   an upper carriage and a laying carriage in each of which an endless conveyor belt travels; and   two laying rollers arranged in parallel at a same height in the laying carriage, the laying rollers forming a laying gap between them for delivering the card web to be laid to an output conveyor belt above which the two carriages are movably guided in a machine stand transversely to the transport direction of the output conveyor belt, wherein
 (a) a laying carriage conveyor belt wraps around the first laying roller, the upper and lower strands of the belt extending parallel to each other from the first laying roller, 
 (b) an endless cover belt which travels around in the laying carriage wraps around the second laying roller, the cover belt having upper and lower strands which extend parallel to each other from the second laying roller in the direction opposite that of the laying carriage conveyor belt, and 
 (c) the mutual distances between the web entrance, the upper carriage, the laying carriage, and the output conveyor belt in a direction perpendicular to the transport directions of same are so small that a first portion of the card web to be laid is enclosed in a sandwich-like manner between the adjacent strands of the web entrance conveyor belt and of the upper carriage conveyor belt, and a second portion of the card web to be laid is enclosed in a sandwich-like manner between the adjacent strands of the upper carriage conveyor belt and of the laying carriage conveyor belt, where the laid fleece on the output conveyor belt is contacted by the laying carriage conveyor belt and by the cover belt. 
   
   
   
       2 . The fleece-laying apparatus according to  claim 1  wherein, in the upper carriage, a second deflecting roller, around which the lower strand of the web entrance conveyor belt wraps, is closely adjacent to, and at the same height as, a first deflecting roller, which deflects the upper carriage conveyor belt. 
   
   
       3 . The fleece-laying apparatus according to  claim 2  wherein, in the upper carriage, a third deflecting roller is supported, around which the lower strand of the web entrance conveyor belt is guided to the second deflecting roller. 
   
   
       4 . The fleece-laying apparatus according to  claim 1  wherein:
 in the area farthest away from the laying rollers, the laying carriage conveyor belt and the cover belt are each guided over a deflecting roller of a diameter smaller than that of the laying rollers;   a belt spreader is located between each of these deflecting rollers and the associated laying roller, each of these spreaders holding the sections of the upper and lower strands of the laying carriage conveyor belt and of the cover belt extending between it and the associated laying roller parallel to each other; and   said deflecting rollers are mounted at a first height such that the section of the upper strand of the belt in question extending between it and the belt spreader extends as a straight continuation of the adjacent belt section located between the belt spreader and the associated laying roller.   
   
   
       5 . The fleece-laying apparatus according to  claim 4  wherein the deflecting rollers of reduced diameter are each supported in a bracket, by means of which they can be moved individually from the first height to a second height, at which the section of the lower strand of the belt in question extending between the deflecting roller and the belt spreader extends as a straight continuation of the adjacent belt section located between the belt spreader and the associated laying roller. 
   
   
       6 . The fleece-laying apparatus according to  claim 5  wherein the brackets for the deflecting rollers of reduced diameter are designed in such a way that the first and second heights are stable end positions, between which unstable intermediate positions are present. 
   
   
       7 . The fleece-laying apparatus according to  claim 5  wherein laterally projecting drivers are formed on the deflecting rollers of reduced diameter or their brackets, and, in the machine stand, devices are provided which, when the laying carriage moves, shift the deflecting rollers to the first or second height position as a function of the direction in which the laying carriage moves. 
   
   
       8 . The fleece-laying apparatus according to  claim 4  wherein between each laying roller and its associated belt spreader, a belt support device is provided, which supports the upper strand of the belt in question from underneath. 
   
   
       9 . The fleece-laying apparatus according to  claim 1  wherein, in the upper carriage, a belt support device is provided, which supports the upper strand of the upper carriage conveyor belt from underneath. 
   
   
       10 . The fleece-laying apparatus according to  claim 2  wherein the first and second deflecting rollers in the upper carriage are in toothed engagement with each other. 
   
   
       11 . The fleece-laying apparatus according  claim 1  wherein the laying rollers are in toothed engagement with each other, and one of them is in engagement with a toothed belt, which is routed through the laying carriage and guided over and driven by deflecting and drive pinions supported in the machine stand. 
   
   
       12 . The fleece-laying apparatus according to  claim 1  wherein the upper carriage conveyor belt is air-permeable.