Abstract:
The invention relates to a method for drawing in a material web ( 33, 34, 36, 37 ) according to which the part ( 59 ) of the tip ( 41 ) laterally projecting over the lateral edge ( 42 ) of the material web is separated lengthwise at least once by means of a slitting device ( 21 ). The invention also relates to a corresponding device for carrying out the method.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention is directed to a method and to a device for drawing-in a web of material. A start of a web tip, which extends laterally of the web, is cut off.  
         BACKGROUND OF THE INVENTION  
         [0002]    It is known from DE 196 21 507 C1 to draw paper webs into web-fed rotary printing presses. Paper web draw-in devices are used for this purpose.  
           [0003]    DE  26   57   789  A1 describes a device for drawing-in a paper web. A draw-in tip of the web is cut off a draw-in mechanism by a cutting device at the side of the longitudinal former.  
         SUMMARY OF THE INVENTION  
         [0004]    The object of the present invention is directed to providing a method and a device for drawing-in a web of material.  
           [0005]    In accordance with the present invention, this object is attained by providing a start of the web tip which is extending laterally past an alignment line of one of the lateral edges of the web. This start of the web tip is cut off the web draw-in assembly. This cut-off start can be grasped by a conveying system and removed. A strip may be cut between the draw-in assembly and the web. A cutting arrangement to accomplish this can be situated upstream of a former roller or on an end of a driveable web guide roller. A disposal station can be provided to dispose of the cut-off start.  
           [0006]    The advantages to be gained by the present invention consist, in particular, in that, following the automatic draw-in of a web of material, the fastening assemblies, for example a formed-on paper tip, are automatically cut off the draw-in mechanism, which may be, for example a draw-in chain, at a preselectable location of a machine, which machine may be, for example, a web-fed rotary printing press.  
           [0007]    The cut-off of the paper web draw-in tip from the paper web takes place at a fixed location, for example at a combining roller which is located upstream of the entry of the web of material into a former. The draw-in speed can be increased. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]    A preferred embodiment of the present invention is represented in the drawings and will be described in greater detail in what follows.  
         [0009]    Shown are in:  
         [0010]    [0010]FIG. 1, a schematic representation of a side elevation view of a device in accordance with the present invention without bearing points, in  
         [0011]    [0011]FIG. 2, a front view of the device shown in FIG. 1, but with bearing points, and wherein the shaft of the guide roller is represented as rotated around the shaft of the upper cutter, and in  
         [0012]    [0012]FIG. 3, an enlarged representation of a draw-in mechanism with the tip of a fastening assembly. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0013]    A guide roller  01 , for example a paper guide roller  01 , is seated or supported on both ends in spaced lateral frames  02 ,  03 , as seen in FIG. 2. The left end  04  of the paper guide roller  01  which has a barrel length “a” is rotatably seated in the lateral frame  02  by the use of a shaft journal  06 , while the right end  07  of the paper guide roller  01  has an extended shaft journal  08 , which is supported by the use of bearings  09 , for example by the use of roller bearings  09 , in a sleeve  11 , which sleeve  11  is, in turn, seated fixed in the right lateral frame  03  and is arranged coaxially with relation to the shaft journal  08 . With its end  12  remote from the guide roller  01 , the sleeve  11  projects from the lateral frame  03  and supports a gear wheel  13 . The end  14  of the shaft journal  08 , which is remote from the roller  01  also projects out of the sleeve  11  and is connected, fixed against relative rotation, via a bushing  16 , with the driveshaft  17  of a motor  18 , which motor  18  may be, for example, an electric motor  18 . The motor  18  is flanged to the exterior of an outer housing  19 , which outer housing  19  is fastened on the outer side of the lateral frame  03  that is remote from the roller  01 .  
         [0014]    A longitudinal cutting arrangement  21  located outside the barrel length “a” and on an end, such as the right end  07 , of the paper guide roller  01 . This longitudinal cutting arrangement  21  consists of at least of an upper cutter  22 , for example a circular cutter  22 , which upper cutter  22  is fastened on a driveable cutter shaft  26  extending axis-parallel with the shaft journal  08  and seated in the lateral frame  03 , as well as in a wall  23  of an inner housing  24  which is fastened on the inner side of the lateral frame  03 ; i.e. the side of the lateral frame  03  close to the roller  01 .  
         [0015]    A cutting edge of the cutter  22  works together with a lower counter cutter  27 , for example in the form of a cutter ring located on the end of the sleeve  11  which is close to the roller  01 .  
         [0016]    While the paper guide roller  01  can be permanently driven by the motor  18  via its shaft journal  08 , the upper cutter  22  located on the shaft  26 , as well as the counter cutter  27  arranged on the sleeve  11 , can also be driven by the provision of a controllable coupling  28 , for example a magnetic coupling  28 .  
         [0017]    The controllable coupling  28  is located inside the outer housing  19  between a cutter shaft gear wheel  29 , fastened on the shaft  26 , and a coupling gear wheel  31 , which is rotatably seated on the shaft  26 . The coupling gear wheel  31  meshes with a bushing gear wheel  32  arranged, fixed against rotation, on the bushing  16 . All of the various bearings used in this assembly are identified by  09 .  
         [0018]    The mode of functioning of the longitudinal cutting arrangement  21  depicted in FIG. 2 is as follows:  
         [0019]    The paper guide roller  01  is driven when the motor  18  is switched on. The bushing gear wheel  32 , which is fixed on the bushing  16 , rotates simultaneously with the paper guide roller  01 , and meshes with the coupling gear wheel  31 , which can freely rotate on the cutter shaft  26 . After the coupling  28  is engaged, the cutter shaft  26 , with the upper cutter  22 , is caused to rotate. At the same time, torque is transmitted from the cutter shaft gear wheel  29 , which is fixedly arranged on the cutter shaft  26 , to the sleeve gear wheel  13  which is fixed on the sleeve  11 , so that the lower counter cutter  27  is also driven and moves along.  
         [0020]    The engagement of the coupling  28  can be caused by a sensor, which is not specifically represented. Aswitched-on time of the coupling  28  can be limited.  
         [0021]    The longitudinal cutting arrangement  21 , or the paper guide roller  01  with the longitudinal cutting arrangement, is arranged, viewed in the production direction, for example upstream of a former inlet roller of a former, so that the paper guide roller  01  is used as the combining roller for webs of material  33 ,  34 ,  36 ,  37 , for example paper webs  33 ,  34 ,  36 ,  37 , entering into the former, as may be seen by referring to FIG. 1. In the course of a web draw-in process, the paper webs  33 ,  34 ,  36 ,  37  each reach the paper web guide roller  01  at different times by operation of a draw-in mechanism  39 , shown in FIG. 3, and which may be, for example, a finite driven roller chain  39 , guided, for example, in a common guide rail  38  fixed on the lateral frame  03 . Each one of the several paper webs  33 ,  34 ,  36 ,  37  has on its leading end or tip a fastening assembly  41 , for example a glued-on or formed-on paper web tip  41 , whose start  59  projects laterally past a lateral or side edge  42 , or laterally past an alignment line  61  of the lateral edge  42  of the paper webs  33 ,  34 ,  36 ,  37 . This paper web tip start  59  also extends past the area of the barrel length “a” of the paper guide roller  01 . The start  59  of the paper web tip  41  is fastened to an extended chain bolt lug or connecting fixture  43  of the roller chain.  
         [0022]    If now the paper web tip  41  reaches the now coupled-in and therefore driven longitudinal cutting arrangement  21 , an element or segment  46  of the paper web tip  41 , which element or segment  41  is delimited by the generated cutting line  44  represented in dash-dotted lines and which element or segment  41  is fastened to the chain bolt  43 , is cut longitudinally, i.e. in the production direction, off the paper web tip  41  and is removed by continued operation of the roller chain  39 .  
         [0023]    The cutting line  44  of the cutter  22  and the counter cutter  27  extends outside of the paper webs  33 ,  34 ,  36  or  37  and in close vicinity of the web lateral edge  42 , as seen in FIG. 3. It is also possible to employ a belt system as the draw-in mechanism  39 .  
         [0024]    In accordance with a second preferred embodiment of the present invention, a second upper cutter  47 , as depicted in FIG. 2, is arranged remote from the roller  01  on the cutter shaft  26  at a distance “c” from the first upper cutter  22 . This second upper cutter  47  cooperates with a second lower counter cutter  48  located on the sleeve  11 . The second upper cutter  47  and the second counter cutter  48  are embodied analogous to the previously described first cutter  22  and first counter cutter  27 .  
         [0025]    Following the arrival of a paper web tip  41  at the longitudinal cutting arrangement  21  in accordance with the second embodiment, an approximately trapezoidal strip  49  is cut out of the paper web tip  41  by the driven longitudinal cutting arrangement  21 , which strip  49  is delimited longitudinally by the cutting line  44  of the first cutter  22  and the first counter cutter  27 , as well as by the cutting line  51 , created by the second cutter  47  and the second counter cutter  48  and with cutting line  51  extending parallel in respect to cutting line  42  and being represented by dash-dotted lines, as may be seen in FIG. 3.  
         [0026]    The cutting lines  44 ,  51  run in such a way that neither the lateral edge  42  of the paper webs  33 ,  34 ,  36 ,  37 , nor the chain bolt  43  are damaged.  
         [0027]    In accordance with a third preferred embodiment, this strip  49 , or the element or segment  46 , which is fastened to the draw-in mechanism  39  , can be removed from the draw-in mechanism  39  by two endless conveying or belt systems  52 ,  53 , as seen in FIGS. 2 and 3, which belt systems  52 ,  53  grip, or clamp the strip  49 , and convey it to a disposal station  54 , for example. The disposal station  54  can consist, for example, of an aspirating device with an upstream connected comminuting device, which is not specifically represented.  
         [0028]    One of the strands of the conveying or belt systems  52 ,  53  is guided between the first cutter  22  and the first counter cutter  27 , or the second cutter  47  and the second counter cutter  48 , as shown in FIG. 2, and each belt system  52 ,  53  runs over deflection rollers  55 ,  56 , as well as through drive and tightening stations  57 ,  58 , respectively.  
         [0029]    The gear wheels  31 ,  32  of the drive mechanism of the longitudinal cutting arrangement  21  are dimensioned in such a way that the circumferential speed of the first upper cutter  22  and the first counter cutter  27  and of the second cutter  47  and the second counter cutter  48  are different, by up to approximately 10%, from the circumferential speed of the paper guide roller  01 .  
         [0030]    The starts  59  of the paper web tips  41  can be separated one after the other and in any arbitrary sequence from the paper webs  33 ,  34 ,  36 ,  37 .  
         [0031]    In accordance with a fourth preferred embodiment of the present invention it is also possible to generate a cutting line  44  with the first cutter  22  and with the first counter cutter  27  and to strip the element or segment  46  of the paper web tip  41 , which is now only fastened on the chain bolt  43 , off the chain bolt  43 . Stripping off of the element or segment  46  can be performed by passing the chain bolt  43  over an up ramp, which rises as far as the free length of the chain bolt  43  and which is fixed in place on the lateral frame.  
         [0032]    While preferred embodiments of a method and device for drawing in a material web, in accordance with the present invention, are set forth fully and completely hereinabove, it will be apparent to one of skill in the art that various changes in, for example, the type of web being drawn-in, the drive for the draw-in mechanism, the types of bearings used, and the like could be made without departing from the true spirit and scope of the present invention, which is accordingly to be limited only by the appended claims.