Abstract:
Device for continuous winding of webs onto winding shafts or winding cores to winding rollers, with a pressure roller supported in a frame that can be engaged on the winding shaft or winding core. This engagement is effected with limited friction and in a sensitive manner by means of a drive, with the pressure roller being supported on at least one steering rod that is pivot-connected to two guides, the other ends of which are pivot-supported in the frame.

Description:
This is a nationalization of PCT/EP02/07272 filed Jul. 1, 2002 and published in German. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The invention relates to a device for continuous winding of webs, preferably webs made of thermoplastic synthetic material, onto winding shafts or winding cores to winding rollers, with arms supporting the winding shaft that is preferably equipped with a drive, with a pressure roller that can be engaged on the winding shaft or winding core, or the forming winding roller, which is supported in a frame, and with a knife separating the web during a roller change. 
   2. Description of the Related Art 
   In winding devices of this type, the pressure roller is pressed against the winding core, or the forming winding roller, by means of a drive device in order to achieve a tightly wound winding roller without any trapped air between the individually wound layers. Devices of the previously stated type are known in which the pressure roller is supported on a carriage that is equipped with a drive that moves the pressure roller and presses against the winding core, or the forming winding roller. The carriage movable in the guides of a frame can be moved only against substantial inevitable friction forces; even together with the pressure roller supported on the same, it creates substantial masses that must be moved during the travel of the carriage. 
   SUMMARY OF THE INVENTION 
   It is therefore the task of the invention to create a device of the previously stated type that enables an engagement of the pressure roller with the winding core, or the forming winding roller, which is low in friction. 
   According to the invention, this task is solved in that the pressure roller is supported on at least one steering rod, which is pivot-connected to two guides, the other ends of which are pivot-supported in the frame, and that the steering rod, or one of the guides, is equipped with a drive device. 
   Purposefully, the pressure roller is supported between two steering rods, each of which is pivot-connected to two guides, the other ends of which are pivot-supported in the frame. 
   The steering rod with two guides provided according to the invention forms a four-joint carrying system that absorbs the weight of the pressure roller in a favorable manner. The device according to the invention is therefore characterized in that the pressure roller is supported low in friction between steering rods of four-joint systems. In the device according to the invention, the pressure roller can be engaged sensitively with the winding core or the forming winding roller by means of its drive device, because there are no large friction forces that must be overcome. Due to the fact that the pressure roller is not supported on a carriage, the masses to be moved are reduced. The pressure roller is moved by means of its drive in horizontal direction only so that the influence of the mass on the contact force is negligible. 
   Purposefully, the drive device consists of at least one pneumatic cylinder. 
   Purposefully, the pressure roller is supported in sections of the steering rod that reach over a guide in the direction of the winding roller. An especially preferred embodiment provides that the guides consist of a front guide or rocker seen from the direction of the winding core or winding roller, which is longer in length than the rear guide. If the winding roller is supported between the sections of the steering rods reaching over the two front guides at a distance to the front guides, the rear, shorter guides pivot the steering rods around the joints at the front guides due to their smaller pivoting radius in such a manner that a pivoting movement of the steering rod superposes the increasing effect of the four-joint system so that the pressure roller performs a linear movement during its displacement in the direction of the winding core or winding roller. 
   This approximate straight guide can be improved by the fact that the shorter rear guides, based on their pivot bearings, extend from the frame at an acute angle to the longer front guides. 
   A further embodiment of the invention provides that the guides are supported on a carriage that can be moved in a frame. The carriages are equipped with a controlled drive, which moves the same once the path of the approximate straight guide of the system consisting of the guides and steering rods has been depleted. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     One embodiment of the invention is explained in further detail based on the drawing. It shows: 
       FIG. 1  a side view of the winding device according to the invention with a distant front side wall of the frame, 
       FIG. 2  the four-joint system each consisting of two guides and steering rods for the approximate straight guide of the pressure roller as drawn from  FIG. 1 , and 
       FIG. 3  an exploded top view of the four-joint system consisting of two guides and one steering rod on one side. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
   Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
     FIG. 1  shows a rear, plate-shaped side component  1 , which is part of a frame. The front side component is removed in order to better view the devices arranged between the side components. 
   A carriage is guided horizontally movable between the side components  1 . Only the side wall  2  of the carriage is illustrated, as the front side wall is again removed for reasons of better illustration. The side walls  2  of the carriage are connected to each other by not illustrated traverse members. The side walls  2  are guided in a movable manner in guides  3  of the side components  1  that are illustrated in broken lines. At its upper side edge, at least the side wall  2  is equipped with a gear rod  4 , which engages with the pinion gear  5  of a gear motor  6 , which is controlled by the electronic machine control for moving the carriage with the side walls  2 . 
   On both sides of a shaft  7  that is supported between the side walls  2 , two-armed levers  8  are pivot-supported, the arms  10  of which point in the direction of the winding core  9 , which carry the charging electrode  12  that expands across the width of the web  11 . The interior arms  13  of the two-armed lever  8  are equipped with axle journals  14 , on which rollers  15  are supported, which are guided in guides  16  of the side components  1  of the frame, and which consist of slotted holes. The guides  16  consist of a laterally extending section  17  and, connected to the same, of a section  18  extending parallel to the guide  3 . 
   Attached to the arms  10  of the two-armed lever  8  extending toward the exterior, are not only the electrode  12 , but also a linear unit, such as a piston rod-less pneumatic cylinder, which moves a knife  19  across the width of the web  11  for the purpose of cutting the web  11 . 
   On both sides of the shaft  7 , front guides or rockers  20  are pivot-supported on the interior sides of the carriage side walls  2 , which are pivoted by means of the pneumatic cylinder  23 , the piston rods  21  of which are pivot-supported on journals  22  of the rockers  20 . The cylinders  23  are pivot-supported on journals  24  of the carriage side walls  2 . 
   Tension springs  25  are arranged below the pneumatic cylinders  23  parallel to the same, the ends of which are suspended from journals  26  of the rocker  20 , and journals  27  of the side wall  2 . 
   The rockers  20  carry axle journals  30  above the pneumatic cylinders  23 , on which coupling elements  31  are supported. At their rear ends, the coupling elements  31  are pivot-connected to rear guides  32  in the joints  33 , the upper ends of which are pivot-supported on axle journals  34  of the side walls  2 . The coupling elements  31 , which may be embodied as steering rods, transfer the rockers  20  in the direction of the winding core  9 . The pressure roller  38  is supported between the free ends of the coupling elements  31 . 
   The electrode  12  may consist of a number of needles, and is laterally encased by rails that provide protective cover. 
   The arrangement of the knife  19  with the piston rod-free pneumatic cylinder on the carrier of the electrodes  12  results in a cut closely above the roller gap between the winding core  9  and the pressure roller  38  once the knife is activated so that a web start with a short flap is created. 
   The web  11  moves in the direction of arrow A, and is fed to the pressure roller  38  by a guide roller  39 , which may be supported, for example, between the side walls  2  of the carriage. 
   The two-armed levers  8  with electrodes  12  and knives  19 , as well as the guides  16  for the rollers  15  of the interior arms of the two-armed levers  8  are arranged laterally reversed to a midplane  140  which extends through the axes of the winding core  9  and the pressure roller  38 . In this way, a simple conversion of the winding device to winding from left to right is possible. 
     FIG. 2  shows the four-joint system for the approximate straight guide of the pressure roller  38 , consisting of the guides and the steering rod, which has been pulled out of  FIG. 1  for the purpose of better illustration. The guide forming rockers  20  on each side are attached to the pivoting shaft  7 , or clamped to the same, which are supported between the side walls  2  of the carriage movable in the guides  3  of the side components  1  in the manner shown in  FIG. 3 . The guides  32  are pivot-supported on the axle journals  34 , which are firmly connected to the side walls  2  in the manner shown in  FIG. 3 . The coupling elements or steering rods  31  are articulated in the joints  30  on the rockers  20 , and in the joints  33  on the guides  32 . The steering rods  31  surmount the rockers  20  by sections  40  of a certain length, between which the pressure roller  38  is supported. 
   The guide  32  is shorter than the rocker  20  between their joints  7  and  30 . In the embodiment example illustrated, the guide  32  is inclined at a right angle in the direction of the rocker  20  based on its upper bearing  34 . The different length of the rockers  20  and of the guides  32 , as well as the distances of the joints  30  and  33  on the steering rods  31 , and the lengths of the coupling rod sections  40  between the bearings for the pressure roller  38  and the bearings  30  on the rockers  20  are coordinated in such a manner that, during the pivoting of the steering rods between the position of the pressure roller  38  illustrated in  FIG. 2  as a full line, in which the steering rods are displaced in the direction of the winding core, and the retreated position illustrated as a semi-colon line, the movement of the pressure roller occurs approximately linear in horizontal direction. 
   The rockers  20  surmount the steering rods  31  by sections  41  of a certain length toward the bottom. For each section a bearing journal  22  is provided below the steering rod  31 , on which the piston rod  21  of the pneumatic cylinder  23  is supported, which in turn is pivot-supported on the journal  24  that is firmly connected to the side wall  2 . 
   Tension springs  25  are spanned below the pneumatic cylinder  23  between the journals  26  of the sections  41  of the rockers  20  and the journals  27  provided on the side walls  2 , which serve the purpose of increasing the adjusting range of the contact force that is exerted on the rockers  20  by means of the pneumatic cylinders  23 . 
   The invention being thus described, it will be apparent that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be recognized by one skilled in the art are intended to be included within the scope of the following claims.