Patent Publication Number: US-6904684-B2

Title: Strapping packaging device

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a strapping packaging device, particularly to one having functions of compressing a strap-clamping member precisely and cutting off a packaging strap easily at the same time. 
     A conventional manually operated strapping packaging device, as shown in  FIG. 1 , includes a strap-compressing device  2 , a strap-rolling device  3  and a cutting device  4  combined together. In using, firstly a packaging strap  5  is tightly tied around an article to be packaged, and then both ends of the packaging strap are overlapped and fitted around with a strap-clamping member  6  to be tightly pressed together by means of a strapping sealer  7 . 
     However, the conventional strapping packaging device  1  and the strapping sealer  7  have to be prepared and used independently, therefore a user has to carry on operating at two different locations with two different tools, inconvenient in using. 
     SUMMARY OF THE INVENTION 
     A main objective of the invention is to offer a strapping packaging device able to have its compressing device compressing a strap-clamping member, and its cutting device cutting off a packaging strap at the same time. 
     Another objective of the invention is to offer a strapping packaging device having its eccentric cam actuated to force a lateral roller to rotate and actuate a slide base simply move up and down along a guide rod and let a press block directly compress the strap-clamping member with precision. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This invention will be better understood by referring to the accompanying drawings, wherein: 
         FIG. 1  is a perspective view of a conventional strapping packaging device and a strapping sealer in a used condition: 
         FIG. 2  is a perspective view of a strapping packaging device in the present invention: 
         FIG. 3  is a side cross-sectional view of the strapping packaging device in the present invention: 
         FIG. 4  is a cross-sectional view of a compressing device of the strapping packaging device in the present invention: 
         FIG. 5  is a cross-sectional view of a cutting device of the strapping packaging device in the present invention: 
         FIG. 6  is a side cross-sectional view of the cutting device assembled with other components in the present invention: 
         FIG. 7  is a side cross-sectional view of a packaging strap in an inserted condition in the present invention: 
         FIG. 8  is a side cross-sectional view of the cutting device cutting off a packaging strap in the present invention: 
         FIG. 9  is a side cross-sectional view of a compressing device having its press block compress the strap-clamping member in the present invention: 
         FIG. 10  is a cross-sectional view of another embodiment of the press block in the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A strapping packaging device in the present invention, as shown in  FIG. 2 , includes a body  10 , a compressing device  20 , a cutting device  30 , s strap-rolling device  40  and a strap-pressing device  50  as main components combined together. 
     The body  10 , as shown in  FIGS. 3 and 4 , is provided with a fixed base  11  at the front end. The fixed base  11  is provided with a hollow receiving space  12  in the center, a lateral shaft hole  13  at an intermediate portion, and a support block  14  protruding out backward on the outer side and having a lateral insert hole  141 . Besides, as shown in  FIG. 5 , the fixed base  11  is formed at the rear side with a vertical through hole  15  having a first and a second receiving hole  151  and  152  respectively at an upper and a lower portion, with the diameter of the first and the second hole  151 ,  152  larger than that of the vertical hole  15 . The body  10  is further provided with a bottom base  17 , as shown in  FIG. 4 . Between the fixed base  11  and the bottom base  17  is a receiving space  18  having an upper and a lower position hole  181  and  182  provided symmetrically to face each other. Further, a blade base hole  19  is provided at a proper location of the outer side of the fixed base  11 , horizontally extending inward from the outer side of the fixed base  11  to communicate with the vertical hole  15 . 
     The compressing device  20 , as shown in  FIGS. 2 ,  3  and  4 , consists of a transmitting shaft  21 , an eccentric cam  22 , an operating rod  23 , a slide base  24 , a press block  25  and a compression spring  26 . 
     The transmitting shaft  21  has its inner end pivotally fitted in the lateral shaft hole  13  of the fixed base  11  and passing through the receiving space  12  and its outer end protruding out of the fixed base  11  and having a key groove  211 . 
     The eccentric cam  22  is pivotally positioned at the center of the transmitting shaft  21  and received in the receiving space  12  of the fixed base  11 . 
     The operating rod  23  is pivotally connected on the transmitting shaft  21  and positioned outside the fixed base  11 . The operating rod  23  is bored at the front end with a fixing hole  231  having a key slot  232 , with a fixing key  233  inserted in the key slot  232  of the operating rod  23  and the key hole  211  of the transmitting shaft  21 . Further, the operating rod  23  has its intermediate portion bent into a curved section  234  and its end connected with a handle  235 . 
     The slide base  24 , as shown in  FIG. 2 , is received in the slide space  121  under the receiving space  12  of the fixed base  11  to slide up and down therein. As shown in  FIG. 4 , the slide base  24  is provided at the upper center with a vertical receiving hollow  241  having a lateral shaft hole  242  at a proper location of an intermediate portion for receiving a support rod  243 . Then, a roller  244  is fixed around the support rod  243  in the receiving hollow  241  and positioned exactly under the eccentric cam  22  and contacting with the same cam  22 . In addition, a vertical slide hole  245  is provided in the slide base  24  at one side of the receiving groove  241  of the slide base  24 . The vertical slide hole  245  receiving a guide rod  246  having opposing ends inserted into the upper and lower positioning holes  181  and  182 . The guide rod  246  guides and limits the slide base  24  to move axially up and down only. The slide base  24  is further bored with a notch  247  at a lower right side, two threaded holes  248  at proper positions in the inner wall and an insert hole  249  in the bottom. 
     The press block  25  for compressing a strap-clamping member  70  is bored with two locking holes  251  at the outer edge respectively for two locking bolts  252  to be inserted therein and lock the press block  25  fixedly at the notch  247  of the slide base  24 . The press block  25  is further provided at the front bottom with an elastic pin  253  and a spring  254  on the elastic pin  253 , which has an inward slanting press surface  255  at its lower end. Thus, the elastic pin  253  is actuated to rise up to let the strap-clamping member  70  get in the blade base hole  19 , and then protrude downward, letting its press surface  255  hold the front edge of the strap-clamping member  70  after the strap-clamping member  70  moves in the blade base hole  19 . 
     The compression spring  26  has one end positioned in the insert hole  249  of the slide base  24  and the other end resting against the topside of the bottom base  17 . 
     The cutting device  30 , as shown in  FIGS. 5 and 6 , consists of a pull rod  31 , a push rod  32 , a sleeve  33 , a spring  34 , an upper blade  35 , and a lower blade  36 . 
     The pull rod  31  is formed with a handle  311  at the rear end and a connecting head  312  at the front end. The connecting head  312  is fitted astride the support block  14  of the fixed base  11  and provided with a pivotal hole  313  pivotally combined with a lateral insert hole  141  by means of a pivotal shaft  314 . A press block  315  extends forward from the connecting head  312 , and will be pushed downward when the pull rod  31  is turned around with the pivotal shaft  314  acting as a fulcrum. Additionally, the press block  315  is formed with a threaded hole  316  in the center for receiving an adjusting bolt  317  having its bottom end protrude out of the bottom of the press block  315 . 
     The push rod  32  is fitted in the vertical hole  15  of the fixed base  11  and has its top end positioned exactly under the adjusting bolt  317  of the pull rod  31  in order to let the adjusting bolt  317  rest against the push rod  32 . The push rod  32  is formed with an annular recess  321  on the top outer circumference for fitting a C-shaped clasp  322  therein, and a connecting fork  323  at the lower end in the second receiving hole  152  of the fixed base  11 . The connecting fork  323  has a pinhole  324  horizontally passing through the connecting fork  323  for receiving a position pin  325  therein. 
     The sleeve  33  with a step-cylindrical shape fits around the upper end of the push rod  32 , fitting in the first receiving hole  151  of the fixed base  11 , and having a round through hole  331  in the center and a receiving space  332  in the interior of the lower end. 
     The spring  34  fits around the push rod  32 , having its upper end extending into the receiving space  332  of the sleeve  33  and its lower end elastically pushing against the bottom side of the first receiving hole  151  of the fixed base  11 . 
     The upper blade  35  is firmly fixed in the blade base hole  19 , having a downward cutting edge  351  at the front end. 
     The lower blade  36  is coaxially and pivotally combined with the upper blade  35 , having an upward cut edge  361  at the front end facing the cutting edge  351  of the upper blade  35 . The lower blade  36  has a fixing hole  362  in the center and a connecting head  363  extending inward at the inner side to be inserted in the connecting fork  323  of the push rod  32 . The connecting head  363  has a fit groove  364  in the rear end pivotally engaged with the position pin  325  of the connecting fork  323 . 
     Moreover, the strap-rolling device  40  and the strap-pressing device  50  in the present invention respectively have the same structure as that of a conventional one, with their details omitted here. 
     In assembling, as shown in  FIGS. 4 and 5 , firstly, the lateral roller  244  is pivotally fitted in the receiving hollow  241  of the slide base  24 , and the support rod  243  is inserted into the shaft hole  242  to be assembled with the lateral roller  244 . Then, the press block  25  is fixed in the notch  247  to be combined together with the slide base  24  by means of the locking bolt  252 , and the compression spring  26  has its upper end sticking in the insert hole  249  of the slide base  24  and its lower end resting against the bottom base  17 . At the same time, the guide rod  246  is deposited in the vertical slide hole  245  of the slide base  24  and has its opposite ends respectively lie in the position hole  181  and  182  of the fixed base  11  to let the guide rod  246  erected in the receiving space  18  between the fixed base  11  and the bottom base  17 , and then the bottom base  17  is locked in position. In order to let the slide base  24  move comparatively smoothly, the opposite sides of an intermediate projecting portion  2401  at its outer side can be respectively fixed with two position members  111  to make the slide base  24  move up and down along the guide rod  246  in the receiving space  18 , as shown in  FIGS. 6 and 7 . 
     Next, as shown in  FIG. 4 , the eccentric cam  22  together with the transmitting shaft  21  is pivotally positioned in the receiving space  12  of the fixed base  11 , and the operating rod  23  is positioned outside the fixed base  11  and pivotally connected with the transmitting shaft  21  by the fixing key  233  inserted through the key hole  232  of the operating rod  23  and engaged with the key hole  211  of the transmitting shaft  21 . 
     Subsequently, as shown in  FIG. 5 , the pull rod  31  is fitted in the vertical hole  15  of the fixed base  11  and has its connecting fork  323  positioned in the second receiving hole  152  of the fixed base  11 . Then, the spring  34  is fitted around the push rod  32  at the first receiving hole  151  and covered up by the sleeve  33 , and a C-shaped clasp is locked in the annular recess  321  of the push rod  32 , thus the push rod  32  restricted to move up and down in the vertical hole  15 . 
     After that, the upper blade  35  and the lower blade  36  are coaxially and pivotally combined together by a fixing pin  37  and placed in the blade base hole  19  of the fixed base  11 , with their cutting edges  351  and  361  positioned at the outer side of the blade base hole  19  for facilitating cutting off a packaging strap. Then, the connecting head  363  of the lower blade  36  is inserted in the connecting fork  323  of the push rod  32  and has its connecting groove  364  at the end pivotally fitted with the position pin  325  of the push rod  32  to permit the lower blade  36  to move up and down together with the push rod  32  in cutting in cooperation with the upper blade  35 . 
     Lastly, as shown in  FIG. 6 , the pull rod  31  has its connecting head  312  pivotally secured on the support block  14  of the fixed base  11  by means of the pivotal shaft  314 , and the adjusting bolt  317  of the press block  315  is screwed in the threaded hole  316 , enabling the adjusting bolt  317  to contact with and push against the top end of the push rod  32 . 
     In using, as shown in  FIGS. 4 and 8 , the strap-clamping member  70  is first placed under the compressing device  20  through the front end of the compressing device  20 , and the elastic pin  253  is actuated to protrude downward and has its press surface  255  holding the front edge of the strap-clamping member  70 . Synchronously, the opposite sides of the strap-clamping member  70  are respectively stuck by the inner position block  171  and the outer position block  172  of the bottom base  17 , and the rear side held by the stopping member  112  protruding downward under the fixed base  11 , as shown in  FIGS. 6 and 7 . 
     Then, as shown in  FIG. 7 , the fixed end  61  of a packaging strap  60  is inserted from back to front through the strap-pressing device  50 , the strap-rolling device  40 , the cutting device  30  and an intermediate through hole  71  of the strap-clamping member  70  under the compressing device  20  to be pressed securely by the strap-pressing device  50 . While the free end  62  of the packaging strap  60  is inserted from front to back through the intermediate through hole  71  of the strap-clamping member  70  to overlap on the fixed end  61  and continue to pass through between the upper blade  35  and the lower blade  36  of the cutting device  30 , wound around the outer edge of the strap-rolling wheel  41  of the strap-rolling device  40  and having its end inserted in the seam  42  of the strap-rolling wheel  41  and secured therein. Then, pull the handle  43  of the strap-rolling device  40  to rotate the strap-rolling wheel  41  to tighten the free end  62  of the packaging strap  60  and binding a box tightly. 
     Next, as shown in  FIG. 9 , press down the operating rod  23  of the compressing device  20 , letting the eccentric cam  22  press the lateral roller  244  to move downward together with the slide base  24  and the pressing block  25 , which presses the strap-clamping member  70  deformed so as to make the overlapped portion of the fixed and the free ends  61  and  62  of the packaging strap  60  tightened and engaged with each other. 
     Lastly, as shown in  FIG. 5 , pull up the pull rod  31 , letting the adjusting bolt  317  of the press block  315  force the push rod  32  move down together with its connecting fork  323 , which will actuate the connecting head  363  of the lower blade  36  move down, and with the fixing pin  37  acting as a fulcrum, the cutting edge  361  of the lower blade  36  will move up to cut off the packaging strap  60  in cooperation with help of the cutting edge  351  of the upper blade  35 . 
     Furthermore, threaded hole  29  can also be provided at the bottom of the notch  247  of the slide base  24 , and locking holes  256  preset in number are bored at the bottom edge of the press block  25 , with a locking bolt  257  inserted from the bottom through the locking hole  257  and the threaded hole  29  to lock the press block  25  and the slide base  24  together. 
     As can be noted from the above description, this invention has the following advantages. 
     1. The strapping packaging device can not only press the strap-clamping member  70  by the compressing device  20 , but also cut off the packaging strap by the cutting device  30  at the same time, easy and convenient in use. 
     2. The eccentric cam  22  is actuated to press the lateral roller  244  to force the slide base  24  simply move up and down along the guide rod  246 , so that the press block  25  can directly compress the strap-clamping member  70  precisely and smoothly. 
     While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.