Abstract:
A device is used for the transfer of harness elements ( 21 ) from a conveying member ( 21 ) in a drawing-in machine for warp yarns onto carrying members of a weaving machine, that has an ejector for removing the harness elements from the conveying member. In order to provide a device in which the carrying members are aligned as exactly as possible at the moment when the harness elements are transferred onto them, there is provided a guide roller for the harness elements which is mounted rotatably about an axis and which has guides for the carrying member which guide the carrying members in two orthogonal directions.

Description:
BACKGROUND OF THE INVENTION 
     The invention relates to a device for the transfer of harness elements from a conveying member in a drawing-in machine for warp yarns onto carrying members of a weaving machine, with an ejector for removing the harness elements from the conveying member. 
     EP 500 848 has already disclosed such a device, in which the carrying members, designed as carrying rails, have an oblique entry flank directed downwards. Ejectors push the harness elements from carrying pins of a conveying member up onto these entry flanks, so that the harness elements slide along these entry flanks onto the carrying rails. The carrying rails are retained or supported against gravity by holding bolts which are capable of being moved in and out and which are fastened to a transport system. In their moved-in position, these holding bolts position the carrying rails. The holding bolts are moved out in order to allow the harness elements to pass at the relevant point. 
     A disadvantage of the known device mentioned is to be seen in that, in order to allow the harness elements to pass, the guidance or support of the carrying rails is temporarily removed precisely when the harness element passes over from the carrying pins of the conveying member onto the carrying rail. This puts exact alignment of the carrying pins and carrying rails at risk. This adverse circumstance can, admittedly, be eased by arranging the said guide of the carrying rails as far as possible from the conveying member, but, even then, the exact alignment of the carrying pins and carrying rails is impaired. 
     SUMMARY OF THE INVENTION 
     The invention, provides a device in which the carrying members are aligned as exactly as possible at the moment when the harness elements are transferred onto them. 
     This is achieved in that the carrying members or carrying rails are guided by a guide roller which is arranged very near the end of the carrying member at the conveying member and which has guides for the carrying member which guide the latter in two orthogonal directions, that is to say laterally and in the direction of gravity, during the transfer of the harness elements. The guide roller has a recess which, starting from the circumference, extends towards the axis and serves, on the one hand, for providing space for the lock-transfer of the end eyes of the harness elements and, on the other hand, for providing an engagement surface for the forward movement of the harness elements on the carrying member by means of the guide roller. In this case, the guide roller, together with the recess, forms a transfer lock for the harness elements. 
     The advantages achieved by means of the invention are to be seen, in particular, in that the carrying member is guided in an exact and defined manner at the moment when the harness elements are transferred from the conveying member, guidance for the lock-transfer of the harness elements being partially cancelled only when the harness element has already been taken up by the carrying member. In this case, the carrying members are always guided laterally by the guide roller, whatever the position of the latter. Another advantage is to be seen in that the guide roller executes a simple rotational movement and, at the same time, propels the harness elements some distance forwards. The guide roller may be designed for any number of adjacent carrying members. While a single harness element is being propelled forwards by the guide roller, the latter additionally holds back harness elements which have already been transported, so that these cannot be pushed towards the conveying member again. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     The invention is explained in more detail below by means of an example and with reference to the accompanying figures: 
     FIG. 1 is a schematic sectional view of the device according to the invention. 
     FIG. 2 shows part of the device on an enlarged scale. 
     FIG. 3 shows a view of the device in a first operating phase, the said view having been pivoted through 90° in relation to FIG.  1 . 
     FIGS. 4 and 5 show the device in two further operating phases. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     FIG. 1 shows a section through part of a guide roller  1  for a plurality of carrying members  2 ,  3 ,  4 , which are arranged next to one another at equal intervals. The guide roller  1  is mounted on a shaft  5  rotatably about an axis  6  in a way not illustrated in any more detail, but known per se, and is connected to a drive  7 . The guide roller  1  has lateral guides  8 ,  9  for guiding the carrying member  4  in the direction of an arrow  10  and guides  11  for guidance in the direction of an arrow  12 , and therefore for guidance in two orthogonal directions. The guides  8 ,  9  are interrupted or widened in the region of a recess  13  and therefore do not form a closed circular ring. A harness element  14 , which is located on the carrying member  4 , is depicted in the recess  13 . A region delimited by an arc of a circle  15  shows a section through the guide roller  1 , this section in turn, being located in the region of the guides  8 ,  9 ,  11 , although, in this case, the carrying member  2 , which is guided by these guides  8 ,  9 ,  11 , is depicted. 
     FIG. 2 once again shows, on an enlarged scale, the carrying member  2  together with the guides  8 ,  9 ,  11  of the guide roller  1 . 
     FIG. 3 shows, from another viewing angle, the arrangement of the guide rollers in or in front of a drawing-in machine for warp yarns. Since the harness elements  16 , illustrated diagrammatically here, have an eye  17 ,  18  at the top and bottom in each case, two carrying rails  19 ,  20  are also provided as carrying member. The drawing-in machine has, as part of a conveying member  21 ,  21 ′ for each harness element, two holding bolts  22 ,  23 , a plurality of which are arranged next to one another, for example, on a rotating chain in each case, as is known, for example, from EP 500 848 already mentioned. Moreover, the drawing-in machine preferably has two ejectors  24 ,  25 , which are each illustrated here in the initial position  26 ,  27  and in the end position  28 ,  29 . These ejectors are capable of executing a lifting movement out of the initial position into the end position. However, such ejectors  24 ,  25  are known per se and therefore the way in which they are driven is not described in any more detail either. A guide roller  30 ,  31  is also provided for each carrying rail  19 ,  20 . The said guide rollers are illustrated in section here, the section running in a plane which is illustrated in FIG. 1 by a broken line  32  and, in principle, passes through the center of the harness elements. Thus, the recess  33 ,  33 ′, which corresponds to the recess  13  (FIG. 1) and which, starting from the circumference  34 ,  34 ′, extends towards the axis  35 , is also rendered clearly visible. The recess  33  causes the guide  36 , corresponding to the guide  11  (FIG.  1 ), to extend approximately over three quarters of the circumference. This proportion is greater for the lateral guides  37 ,  38 , which correspond to the guides  8 ,  9  (FIG.  1 ). The guide roller is arranged very near the end  46 ,  47  of the carrying rails  19 ,  20  or of the carrying member and so as to be adjacent to the conveying member  21 ,  21 ′. 
     FIG. 4 again shows the same elements as FIG.  3 . These elements are therefore also given the same reference symbols. However, the guide rollers  30 ,  31  and the harness element  16  have assumed a different position. The harness element  16  has been grasped by guide surfaces  39 ,  40  in the recesses  33 ,  33 ′ and moved on the carrying rails  19 ,  20 . The ejectors  24 ,  25  are still in their end positions  28 ,  29 . 
     FIG. 5 shows, yet again, the same elements as FIG.  3 . Here, the harness element  16  is illustrated as having been transported even further. 
     The device operates as follows: A harness element  16 , such as, for example, a heald or drop wire, is guided in a way known per se, on two holding bolts  22 ,  23 , in front of the carrying rails  19 ,  20  by synchronously rotating conveying members  21 ,  21 ′. The ejectors  24 ,  25  then move out of the initial positions  26 ,  27  into the end positions  28 ,  29 , the end eyes  17 ,  18  of the harness element  16  being stripped from the holding bolts  22 ,  23  in the direction of an arrow  45  and being pushed onto the carrying rails  19 ,  20 . During this time, the carrying rails  19 ,  20  are guided laterally by the guides  37 ,  38 ,  37 ′  38 ′ and vertically by the guide  36 ,  36 ′. The harness element  16  is then grasped by the guide rollers  30 ,  31 , which rotate in the direction of the arrows  41 ,  42 . Since the channel defined by the guides  8 ,  9 ,  11  (FIG. 1) and  36 ,  37 ,  38  and  36 ′,  37 ′  38 ′ is as narrow as a carrying rail  19 ,  20 , but narrower than an end eye  17 ,  18 , a boundary  43 ,  44  of the recess  33 ,  33 ′ forms a guide surface  39 ,  40  (FIG.  4 ), along which the end eyes  17 ,  18  slide and, at the same time, are moved further on the carrying rail  19 ,  20 . In this case, the guidance of the carrying rails  19 ,  20  by the guides  36 ,  36 ′ is lost for a short time in the region of the position as shown in FIG. 4, but this is not a disadvantage, since the transfer of the harness element  16  onto the carrying rails  19 ,  20  has already taken place. The lateral guidance of the carrying rails by the guides  8 ,  9  (FIG. 1) and  37 ,  38  and  37 ′,  38 ′ is always maintained. In the position shown in FIG. 5, guidance is once again effective on all sides. From then on, the guide roller  30 ,  31 , via the circumference  34 ,  34 ′, supports the harness elements against backward movement. 
     The rotational movement of the guide roller may be continuous or controlled in a specific manner by means of control and monitoring elements. In the case of continuous movement, the position of the recesses  13 ,  33  give rise to periods of time in which the ejectors  24 ,  25  can eject the harness element  16 . However, the movement of the guide roller may also be governed by the conveying member  21 , so that the guide roller waits in a position according to FIG. 3 until the ejectors  24 ,  25  have performed their task. The guide roller then executes a complete revolution as quickly as possible, in order to return to the position according to FIG.  3 . In this case, the guide roller may be driven by means of a DC motor or a stepping motor. Corresponding rotary transducers have to be provided for monitoring the position. In any event, however, the drive  7  is operatively coordinated with the drive of the ejectors  24 ,  25 , as can be gathered from the manner of operation described.