Abstract:
The present invention proposes a plastic film guiding device of a packaging machine, which comprises a frame, a screw rod, a walking block, a positioning rod, a pair of slanting rods, and a pair of slide bodies. The plastic film guiding device of the present invention is arranged in suspended way to reduce its contact with the surface of a machine table so that the present invention suffers less heat to facilitate the adjustment. Most importantly, the present invention has instant width-adjusting function, and can simultaneously perform identical adjustments to the widths of both sides. The adjustment is fast, and the positions of movement are exact. Moreover, fine adjustment of width can be performed at any time during the operation of the machine.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a plastic film guiding device of a packaging machine and, more particularly, to a moving structure of a guiding device, which is capable of simultaneously controlling the widths of both sides.  
         BACKGROUND OF THE INVENTION  
         [0002]    [0002]FIG. 1 shows a prior art guiding device of packaging plastic film, wherein a pair of dissymmetrical bottom plates  11  are locked on a machine table, and a width-adjusting rod  12  is locked slantingly on the surface of each of the bottom plates  11 . The width-adjusting rod  12  has a T-shaped cross section. A width-adjusting seat  13  is telescoped on the width-adjusting rod  12 . A corresponding T-shaped groove is formed in the width-adjusting seat  13 . A screw hole  14  penetrating to the T-shaped groove is formed on the side plane of the width-adjusting seat  13 . The width-adjusting seat  13  is locked on the width-adjusting rod  11  through a turn button  15 . Inclined planes are formed at the facing ends of the two width-adjusting seats  13 . An article guiding rod  16  is joined at each of the two inclined planes so that the two article guiding rods  16  are parallel. The outer side of each of the article guiding rods  16  slantingly joins the lower end of a height-adjusting rod  17  with the vertical plane thereof. The height-adjusting rod  17  also has a T-shaped cross section. A height-adjusting seat  18  is telescoped on the height-adjusting rod  17 . The height-adjusting seat  18  is          -shaped. The top plane of each of the height-adjusting seats  18  has a through screw hole  19 . The height-adjusting seat  18  is locked on the height-adjusting rod  17  through a turn button  191 . The inner side plane of each of the height-adjusting seats  18  joins a hooked plastic film guiding plate  192 .  
           [0003]    This prior art structure has been used for many years. Although its function is very good, its adjustment is not convenient. This prior art structure is joined against the surface of a machine table. The bottom plane of the machine table has a heating device. Guided-in plastic film is sleeved on an article and the both sides thereof are heated for packaging. For controlling the guiding-in of plastic film, the plastic film guiding device is provided to control the width and height of package. The length of package is also controlled using a cutting device at the rear end.  
           [0004]    Because the mechanisms of the prior art are individually fixed, the assembly is not easy after disassembled for maintenance or cleaning so that professional technicians are required. Therefore, the adjustment of the prior art structure is not convenient. All turn buttons must be loosened beforehand when setting each specification to perform the adjustment. Especially, because the installed position thereof is very near the heating device, the machine must be halt when the adjustment is performed. That is, heating must be stopped to facilitate manual adjustment. Moreover, the adjustment is separately performed at both sides, and the control is carried out through the help of scale rules at both sides. However, slight error still exists. Therefore, the run-in time and process are relatively lengthened. The present invention aims to resolve the above problems in the prior art.  
         SUMMARY OF THE INVENTION  
         [0005]    One object of the present invention is to provide a plastic film guiding device of a packaging machine. The guiding device is arranged in suspended way to reduce its contact with the surface of a machine table so that the present invention suffers less heat to facilitate the adjustment. Most importantly, the present invention has instant width-adjusting function, and can simultaneously perform identical adjustments to the widths of both sides. The adjustment is fast, and the positions of movement are exact. Moreover, fine adjustment of width can be performed at any time during the operation of the machine.  
           [0006]    The present invention comprises a frame, a screw rod, a walking block, a positioning rod, a pair of slanting rods, and a pair of slide bodies. The frame comprises two bottom plates, two side plates, a top plate, a front axle sheet, and a rear axle sheet. The front and rear axle sheets are installed at the centerline of the frame. The front axle sheet has a pivotally-joining hole, and the rear axle sheet has a screw hole. The screw rod penetrates the screw hole with the front end thereof joined in the pivotally-joining hole and the rear end thereof joining an adjuster. A screw hole penetrating from front to rear is formed in the walking block to be passed through by the screw rod so that the walking block can be led to move forwards or backwards by the screw rod. A transverse hole is formed at the bottom of the walking block. The positioning rod is threaded in the transverse hole to be fixed perpendicular to the screw rod. The inner end of the slanting rod is joined at the top plate, and the outer end thereof protrudes out forwards. The positioning rods are symmetrically arranged. Each slide body has a slide block and a guide block. Each slide block is telescoped in the slanting rod via a slide groove. The inner end of the slide block joins downwards the guide block so that the two guide blocks are parallel arranged. The guide block joins one end of a height-adjusting rod. The pair of guide blocks are led to move by the adjuster for controlling the guided-in width of plastic film and for successfully guiding in articles. The height-adjusting rod is joined on the outer side plane of the guide block and is slantingly forward and upward. A fixing block is telescoped on the height-adjusting rod. The fixing block has a slide way therein to be passed through and has a control turn button for adjustment. The outer end of the height-adjusting rod joins a hooked plastic film guiding plate. An adjustable hanging device is provided above the top plate.  
           [0007]    The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which: 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS:  
       [0008]    [0008]FIG. 1 is a perspective view of the prior art.  
         [0009]    [0009]FIG. 2 is a perspective view of the present invention;  
         [0010]    [0010]FIG. 3 is an exploded perspective view of the present invention;  
         [0011]    [0011]FIG. 4 is a top view of the present invention when not moved yet;  
         [0012]    [0012]FIG. 5 is an action position diagram of the present invention when already moved;  
         [0013]    [0013]FIG. 6 is a side view of the present invention when performing height adjustment; and  
         [0014]    [0014]FIG. 7 is a perspective view of the present invention with a hanging device attached thereon. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0015]    As shown in FIGS.  2  to  6 , a plastic film guiding device  2  of a packaging machine of the present invention comprises a frame  21 , a screw rod  22 , a walking block  23 , a positioning rod  24 , a pair of slanting rods  28 , and a pair of slide bodies  25 . The frame  21  comprises two bottom plates  211 , two side plates  212 , a top plate  213 , a front axle sheet  214 , and a rear axle sheet  216 . The front axle sheet  214  and the rear axle sheet  216  are provided at the centerline of the frame  21 . The front axle sheet  214  has a pivotally-joining hole  215 , and the rear axle sheet  216  has a screw hole  217 .  
         [0016]    The screw rod  22  penetrates the screw hole  217  with the front end thereof joined in the pivotally-joining hole  215  and the rear end thereof joining an adjuster  218  (such as a manual wheel shown in the figure). The screw rod  22  is driven by the adjuster  218 .  
         [0017]    A screw hole  231  penetrating from front to rear is formed in the walking block  23  to be passed through by the screw rod  22  so that the walking block  23  can be led to move forwards or backwards by the screw rod  22 . A transverse hole  232  and a bottom screw hole  234  are formed at lower part of the bottom of the walking block  23 . The positioning rod  24  is threaded in the transverse hole  232  to be fixed perpendicular to the screw rod  22 .  
         [0018]    As shown in the FIGS.  2  to  6 , the positioning rod  24  can be a circular transverse rod passing through the transverse hole  232 , and is fixed in the walking block  23  by locking a stud  233  in the bottom screw hole  234  of the walking block  23 . The inner end of the slanting rod  28  is joined on the top plate  213 , and the outer end thereof protrudes out forwards. The positioning rods  28  are symmetrically arranged with respect to the centerline of the frame  21  to be approximately          -shaped.  
         [0019]    Each of the slide bodies  25  has a slide block  251  and a guide block  254 . Each slide block  251  is telescoped in the slanting rod  28  via a slide groove  252 . As shown in the FIGS.  2  to  6 , the slanting rods  28  seem to be not connected to the slide groove  252 . There are two ways to resolve this problem. The first way: a slide block of a linear bearing is formed on the periphery of the slanting rod, and the slide track of the linear bearing is fixedly provided in the slide groove  252 , thereby forming a linear slide structure. The second way: the slide groove  252  forms a mouth-shaped passage, and the slide bodies  25  are directly hanged on the slanting rods  28 . The inner end of the slide block  251  joins downwards the guide block  254  so that the two guide blocks  254  of the two slide bodies  25  are parallel arranged. The guide block  254  joins one end of a height-adjusting rod  26 .  
         [0020]    As shown in the FIGS.  2  to  6 , the slide block is slightly triangular. The top end of the guide block  254  is joined on the side plane of the slide block  251  by means of a triangular block  253 . The inner side of the lower end of the guide block  254  joins an L-shaped guide plate  255 . The outer end of the L-shaped guide plate  255  protrudes out forwards. The L-shaped guide plate  255  is used for controlling the guided-in width of the plastic film  4  and for successfully guiding in articles.  
         [0021]    The height-adjusting rod  26  is joined on the outer side plane of the guide block  254  and is slantingly forward and upward. A fixing block  27  is telescoped on the height-adjusting rod  26 . The fixing block  27  has a slide way  271  therein to be passed through and has a control turn button  273  for locking and adjusting. The fixing block  27  is covered by a cover plate  272 , which is locked on the fixing block  27  with a plurality of small screws screwed in holes of the cover plate  272 . The control turn button  273  also passes through a central hole of the cover plate  272  to be locked on the surface of the height-adjusting rod  26 . The outer end of each height-adjusting rod  26  joins a hooked plastic film guiding plate  275 . The plastic film guiding plate  275  is used for guiding in the plastic film  4 .  
         [0022]    Each height-adjusting rod  26  has scales  261  thereon. The fixing block  27  moves upwards and downwards on the height-adjusting rod  26  to set the guided-in height of the plastic film  4 . A scale ruler  210  is provided on the side plane of the front section of the top plate  213  for controlling the to and fro motion and the expanded size of the slide bodies  25  so as to become the control scales for width adjustment.  
         [0023]    As shown in FIG. 6, when the fixing block  27  is moved upwards (outwards) from a distance of length e to a distance of length f away from the bottom of the bottom plate  211 , and also from a distance of length c to a distance of length d away from the front end of the bottom plate  211 , the height adjustment of the guided-in plastic film is completed.  
         [0024]    The present invention can also be hanging type. As shown in FIG. 7, a hanging device  29  is provided above the top plate and is joined at the centerline of the frame. The top plate  213  has a slide groove  219 . The two sides of a horizontal part  291  of an L-shaped plate  290  are joined in the slide groove  219 . The relationship between the slide groove  219  and the L-shaped plate  290  can be the relationship between a T-shaped groove and a raised edge or the relationship between similar structures. At least a fixing screw  292  is provided above the L-shaped plate  290  to pass from a long hole of the horizontal part  291  to the screw hole of the top plate  213  so that not only the L-shaped plate  290  can join the guiding device  2 , but also the for and aft position of the guiding device  2  can be adjusted.  
         [0025]    The front end of a vertical part  293  of the L-shaped plate  290  joins an adjusting block  296 . The vertical part  293  has a long hole  294 . An adjusting screw  295  passes through the long hole  294  to lock the L-shaped plate  290  on the surface of the adjusting block  296 . The adjusting screw  295  can be loosened for adjusting the height of the adjusting block  296  so that the up and down height of the guiding device  2  of the present invention can be adjusted. A scale ruler  35  can be provided on the side surface of the vertical part  293  of the L-shaped plate  290  for adjusting the height of the hanging device  29 .  
         [0026]    A through groove  297  is formed in the adjusting block  296  to be penetrated by a rod  298  (a circular rod or a square rod). A positioning screw  30  on the top plane of the adjusting block  296  is locked in the screw hole  299  of the adjusting block  296  for adjusting the left and right position of the guiding device  2  of the present invention. A scale ruler  37  can be provided on the rod  298 , and a scale ruler  36  can be provided on the top side surface of the vertical part of the L-shaped plate  290  for adjusting the horizontal position of the hanging device  29 .  
         [0027]    The other end of the rod  298  is joined on a side plane  3  of a machine table through an eared fixing seat  33 . The rod  298  is locked on the machine table with a pair of screws  32  passing through holes of the eared fixing seat  33 . Thereby, the present invention can be hanged above the surface of the machine table, showing a structure different from the prior art.  
         [0028]    The present invention utilizes the turn of an adjuster to lead a pair of slide bodies  25 . Because a pair of slanting rods  28  is arranged as          -shape, the slide bodies will generate synchronous left and right motion, i.e., simultaneous motion toward or away from each other. As shown in FIG. 5, solid lines show the position before adjustment, while dashed lines show the position after adjustment. The distance between the two L-shaped guiding plates  255  is b before adjustment, and the distance between them becomes a after adjustment. As shown in FIG. 5, the outer ends of the L-shaped guide plates  255  shrink from outer site to inner site. Thereby, the width control of the guiding device  2  becomes synchronous shrinkage or enlargement, and the adjustment can be performed whenever and wherever. In other words, instant adjustment can also be performed during the process. This is totally different from the prior art. Moreover, it is not necessary to adjust a pair of turn buttons as the prior art, and it is not necessary to halt the machine for adjustment.  
         [0029]    Furthermore, a hanging device is added in the present invention to hang the guiding device  2  high. This is totally different from the prior art, wherein the guiding device can only be installed on the surface of a machine table. Therefore, the heat suffered by the whole guiding device can be reduced so that width and height adjustment can be performed more conveniently. The present invention utilizes a pair of fixing blocks for height adjustment. Therefore, the present invention has better effects of guiding and adjustment for plastic film than the prior art.  
         [0030]    Although the present invention has been described with reference to the preferred embodiments thereof, it will be understood that the invention is not limited to the details thereof. Various substitutions and modifications have been suggested in the foregoing description, and others will occur to those of ordinary skill in the art. Therefore, all such substitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims.