Patent Document

BACKGROUND OF THE INVENTION 
     1) Field of the Invention 
     The invention herein relates to an improved structure portable strapping machine of simple arrangement that is easy and convenient to utilize for strapping heavy or large objects which are difficult to ship, the improved structure strapping device of the present invention thereby providing for greater ease, convenience, speed, and reliability. 
     2) Description of the Prior Art 
     The conventional means of securely strapping difficult-to-ship, large dimension or heavy packaged objects typically consists of a wrapping a steel band with a portable, manually operated tool. While such an approach effectively achieves the strapping of packaged objects, said steel band has the disadvantages of high cost, excessive weight, and injury hazards. Furthermore, since such steel band strapping tools are operated by hand, work efficiency is low and operation is troublesome, inconvenient, and laborious. 
     SUMMARY OF THE INVENTION 
     The primary objective of the invention herein is to provide an improved structure portable strapping machine in which after a PET plastic band is wrapped around a strapped object, since it is drawn taut by a strap pulling device and then a swinging device applies pressure and rapidly sways against the top layer of the overlaid section, the overlaid section of said band is welded into a single structural entity by heat generated by high-speed friction, thereby ensuring easy, convenient, rapid, and safe strapping operation. 
     Another objective of the invention herein is to provide an improved structure portable strapping machine in which a cutting device blade consists of a saw-toothed cutting edge and, furthermore, when the swinging device applies downward pressure on the band and the top layer surface of the band overlaid section is tensively contacted and pressed, said band overlaid section is subjected to the swinging device and its high-speed reciprocal swaying such that the saw-toothed cutting edge of said blade rapidly and, furthermore, efficiently cuts the band without affecting the stationary condition of the bottom layer. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an isometric drawing of an embodiment of the invention herein. 
         FIG. 2  is an exploded drawing of an embodiment of the invention herein. 
         FIG. 3  is a cross-sectional drawing of the piston of the invention herein ascending to the top dead center point during the strapping operation. 
         FIG. 4  is an orthographic drawing of the strap puller motor of the invention herein turning upward during the strapping operation. 
         FIG. 5  is an orthographic drawing of the strap puller motor of the invention herein in the down position during the strapping operation. 
         FIG. 6  is a cross-sectional drawing of the piston of the invention herein descending during the strapping operation. 
         FIG. 7  is an orthographic drawing of the adjustment screw of the invention herein against the gear box bottom section. 
         FIG. 8  is an orthographic drawing of the strapping plate of the invention herein being pushed by the inside of the strap. 
         FIG. 9  is an orthographic drawing of  FIG. 8 , as viewed from a lateral perspective. 
         FIG. 10  is an orthographic drawing of the strapping plate of the invention herein stopped at the outer cover of the gear box side mount. 
         FIG. 11  is an orthographic drawing of  FIG. 10 , as viewed from a lateral perspective. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIG. 1 ,  FIG. 2 , and  FIG. 3 , the improved structure portable strapping machine of the invention herein is comprised of: 
     A main body  10  having a cylinder  101  at its upper end, and an open, downward oriented passage  102  at its lower end, a guide hole  103  contiguously disposed between said cylinder  101  and passage  102 , and an outer cover  11  attached to its top section, wherein said outer cover  11  has a sleeve hole  111  at the center and an air chamber  112  is formed around the sleeve hole  111 . 
     A plurality of elastic components  20  installed inside the cylinder  101  at the upper end of the main body  10 . 
     A piston component  30  fitted into the cylinder  101  at the upper end of the main body  10  by means of a sealing ring  301  and resiliently supported upward at the lower end by the elastic components  20 , a locating post  302  projecting upward from the center, said locating post  302  also capable of sliding in the sleeve hole  111  of the outer cover  11  at the main body  10  top end, a blind hole  303  at the center, and an air guide hole  304  disposed at the lower end of said blind hole  303  that is in continuity with the exterior. 
     A cutting device  40  consisting of a blade  401  that slides along one side wall  104  at the lower end of the main body  10 , a large through-hole  4011  disposed in the center section, a locating slot  4012  near the upper end, and a saw-toothed cutting edge  4013  along the bottom end; an elastic component  402  installed in the locating slot  4012  near the top end of the blade  401 ; a drive rod  403 , the upper end of which is attached to the piston  30  with the lower end inserted through the locating slot  4012  near the upper end of the blade  401  and supported by the elastic component  402  such that tensive downward pressure is always applied to the blade  401 . 
     A swinging device  50  consisting of a rocker arm  501  situated in the passage  102  at the lower end of the main body  10  and concealed inside a side cover  12  disposed lateral to the lower end of the main body  10 , the upper extremity of which is inserted into the main body  10  guide hole  103  and hinged to a locating pin  5011  at the piston  30 , and an elongated guide hole  5012  formed near the lower extremity; an upper friction block  502  capable of swaying to the left and right that is hinged to the lower extremity of the rocker arm  501 ; an eccentric rod  503 , the eccentric section  5031  at the middle portion of which is situated at the elongated guide hole  5012  near the lower extremity of the rocker arm  501 , with a bearing  5032  installed against its circumferential surface via the elongated guide hole  5012  such its two ends are in a pivotable state at the side cover  12  at the lower end of the main body  10  and the side wall  104 ; a drive motor  504  situated at the exterior lateral extent of the side wall  104  at the lower end of the main body  10  and aligned over the cutting device  40  blade  401 , the center shaft  5041  of which penetrates the blade  401  through-hole  4011  and is then installed to the eccentric rod  503  such that the rotation of the eccentric rod  503  causes the leftward and rightward swaying of the rocker arm  501  and the upper friction block  502  installed at the lower extremity of the rocker arm  501 . 
     A strap pulling device  60  consisting of a base  601  situated at the bottom section of the main base  10  that has a locating arm  6011  extending upward from one side and an arcuate guide hole  6012  formed at the lower extent of the locating arm  6011 ; a gear box  602  that includes a screw  6021  capable of swaying upward and downward which is insertionally positioned at the locating arm  6011  at one side of the base  601  and enmeshed with an internally disposed worm gear  6022  and worm shaft  6023 , wherein said locating worm gear  6022  shaft  6024  is also inserted through the locating arm  6011  arcuate guide hole  6012 ; a strap puller wheel  603  at the opposite side and upper extent of the base  601  situated with the worm gear  6022  on the same shaft  6024 ; a gear box side mount  604  situated with the gear box  602  on the same screw  6021  insertionally positioned at the base  601  locating arm  6011 , the lower end of which provides for the insertional positioning of a worm gear  6022  as well as a strap puller wheel  603  shaft  6024 , and a side cover  6041  over the anterior upper extent of the strap puller wheel  603 ; an anti-slip block  605  installed at the base  601  aligned with the puller wheel  603 ; a lower friction block  606  installed at the base  601  aligned with the swinging device  50  upper friction block  502 ; a strapping plate  607 , the upper end of which is pivotably installed on the surface at the front end of the base locating arm  6011  with a locating screw  6071  and capable of swaying freely having an elastic component  6072  (can be a return spring) at the locating screw  6071 , with one end of said elastic component  6072  resting against inner side of the strapping plate  607  such that the strapping plate  607  is always subjected to tensive force towards the strap puller wheel  603  and a horizontally oriented arcuate slot  6073  is formed in the lower end, said horizontally oriented arcuate slot  6073  providing for the insertion of a screw  6074  that is fastened to the surface at the front end of the base locating arm  6011 ; and a strap puller motor  608  of long tubular shape installed at one end of the gear box  602  that directly drives the worm shaft  6023  and enables the rotation of the enmeshed worm gear  6022 , the shaft  6024 , and the strap puller wheel  603 . 
     An elastic component  70  installed at one side of the main body  10 , the lower end of which directly supports the surface at the upper end of the gear box  602  such that the strap puller motor  608 , the gear box  602 , the strap puller wheel  603 , and the gear box side mount  604  are always subjected to tensive downward pressure via the fulcrum of the base  601  locating arm  6011 . 
     A handle  80  disposed at one side of the main base  10  and situated at the upper extent of the long tubular-shaped strap puller motor  608  that provides for the manual upward and downward turning of the strap puller motor  608 , the gear box  602 , the strap puller wheel  603 , and the gear box side mount  604 . 
     An air pressure control valve  90  installed at the rear end of the main base  10  that is controlled by a plurality of switches  901 ,  902 , and  903 , through which compressed air is respectively conveyed to a main body  1  air duct A (see  FIG. 3 ), a drive motor  504  air intake port  5042  (see  FIG. 2 ), and a strap puller motor  608  air pipe B to the air chamber  112  in the outer cover  11  at the upper end of the main body  10 , the swinging device  50  drive motor  504 , and the strap pulling device  60  strap puller motor  608 , thereby controlling the operation of the cutting device  40 , the swinging device  50 , and the strap pulling device  60 . 
     Utilizing said structure of the invention herein, referring again to  FIG. 4 , after the operator wraps a PET plastic band K around a strapped object E, the thumb of one hand is placed on the handle  80  and the remaining four fingers grasp the strap pulling device  60  strap puller motor  608  to turn it upward, causing said strap pulling device  60  gear box  602 , strap puller wheel  603 , and gear box side mount  604  to each travel upward on the screw  6021  serving as the axial point at the base locating arm  6011  such that said strap puller wheel  603  is swung upward, following which a large interval results due to its disengaged enmeshment from the anti-slip block  605 ; utilizing said piston  30  that is normally subject to the decompression of the elastic components  20  and thereby shoved upward to the top dead center point, the upper friction block  502  of said swinging device  50  rocker arm  501  and the blade  401  of the cutting device  40  drive rod  403  are lifted into a retracted state, the operator then directly inserts the overlaid section K′ of the band K wrapped around the strapped object E into one side of the strap pulling device  60  base  601 , thereby positioning it at the lower extent of the strap puller wheel  603 , the upper friction block  502 , and the blade  401 ; referring to  FIG. 5  and  FIG. 6 , after the band K overlaid section K′ is definitely positioned at the lower extent of the strap puller wheel  603 , the upper friction block  502 , and the blade  401 , the operator lowers the strap puller motor  608 , causing said strap puller wheel  603  to exert downward pressure on the band K and utilizing the elastic component  70  installed at one side of said main body  10  that always exerts tensive pressure against the upper end of the strap pulling device  60  gear box  602 , when said strap puller motor  608  lowered such that the strap puller wheel  603  is pressed down, the overlaid section K′ is subjected to elastic pressure and directly clutched by the strap puller wheel  603  and the anti-slip block  605 ; when the operator presses the first switch  901  of the air pressure control valve  90  and thereby causes compressed air to power the strap pulling device  60  strap puller motor  608 , the motive force is transferred via the worm shaft  6023 , the worm gear  6022 , and the shaft  6024  to the strap puller wheel  603  such that the top layer of the overlaid section K′ is directly contacted and pressed by the strap puller wheel  603  and thereby drawn and shifted tight; after band K winding operation around the strapped object E is completed, the operator releases the first switch  901  of the air pressure control valve  90  and next presses the second switch  902 , causing said compressed air to simultaneously enter the air chamber  112  (see  FIG. 6 ) in the outer cover  11  of the main body  10  to power the swinging device  50  drive motor  504  as well as the main body cylinder  101  to provide compression for the downward movement of the piston  30  inside, thereby pressing down the upper friction block  502  of swinging device  50  rocker arm  501  hinged at its lower end such that after its said downward movement, the upper friction block  502  tensively contacts the top layer of the overlaid section K′ and, at the same time, the motive force of the eccentric rod  503  powered by drive motor  504  is transferred to the rocker arm  501  such that the upper friction block  502  hinged to the lower end of said rocker arm  501  is impelled to sway rapidly to the left and the right, the rapid rubbing of the overlaid section K′ top layer by the upper friction block  502  generating high heat that directly welds it to the overlaid bottom layer into a single structural entity. 
     In said description, when the cylinder  30  is impelled downward and the swinging device  50  welds the band K overlaid section K′, since said cutting device  40  drive rod  403  is similarly attached to the cylinder  30  and moves down with it, and the blade  401  insertionally positioned at the drive rod  403  is supported by the elastic component  402  and also capable of moving downward under tensive pressure to contact the top layer of the band K overlaid section K′, since the blade  401  cutting edge  4013  is saw-toothed, and said top layer of the band K overlaid section K′ is subjected to the swaying operation of the swinging device  50  upper friction block  502  and the consequent rapid leftward and rightward rubbing, the saw-toothed edge of the blade  401  rapidly and, furthermore, reliably cuts the top layer of the band K overlaid section K′, enabling the wrapping of the strapped object E. Of course, since the bottom layer of the band K overlaid section K′ is not impelled by the swinging device  50  upper friction block  502 , tightness is maintained and it remains fixed, said blade  401  not having any cutting effect on the fixed lower layer band K, thereby ensuring the strapping integrity of the band K. 
     After the welding and cutting of the band K wrapped wound around the strapped object E, the operator releases the second switch  902  of the air pressure control valve  90  and next presses the third switch  903  and since the swinging device  50  drive motor  504  is thereafter no longer driven and air is discharged from the air chamber  112  in the outer cover  11  of the main body, as indicated in  FIG. 3 , said cylinder  30  is resiliently returned by the elastic component  20 , the upper friction block  502  and the cutting device  40  blade  401  also moving upward and returning away from the strapping band K. 
     Referring to  FIG. 7 , an adjustment screw  6015  is installed in the bottom section at one side of said strap pulling device  60  base  601 , with the exposed said adjustment screw  6015  against the gear box  602  bottom section capable of high and low adjustment such that when the operator releases the strap puller motor  608  and the gear box  602  as well as the strap puller wheel  603  such that both are pressed downward, the exposed height adjustment of said adjustment screw  6015  causes the gear box  602  and the strap puller wheel  603  to be pressed downward a certain range, enabling the strap puller wheel  603  to reach an optimal height to contact the band K such that the band K is reliably and efficiently drawn taut. In other words, due to the high and low adjustment operation of said adjustment screw  6015 , said strap puller wheel  603  can be articulated to the best height for contacting the band K, thereby reliably and efficiently enabling bands K of various thickness to become pulled tight. 
     Referring to  FIG. 8  and  FIG. 9 , since the strapping plate  607  installed on the surface at the front end of the base  601  locating arm  6011  is subjected to the tensive force of the elastic component  6072  and always subjected to tensive force towards the strap puller wheel  603 , when the band K wrapped around the strapped object E is pulled into the strap pulling device  60  base and situated at the lower extent of the strap puller wheel  603 , the elastically loaded strapping plate  607  is directly pushed inward by the band K with a locating screw  6071  serving as the axial point, thereby fully impelling the strap puller wheel  603  to the band K. Conversely, referring to  FIG. 10  and  FIG. 11 , when the strap puller motor  608  is turned upward and consequently nudges the strap puller wheel  603  up such that it is disengaged from enmeshment with the anti-slip block  605  and the band K does not enter the lower extent of the strap puller wheel  603 , since said strapping plate  607  is always elastically pressured towards the strap puller wheel  603 , it is not pushed inward by the band K and gear box side mount  604  rises upward, but automatically elastically pressured towards the strap puller wheel  603  and, furthermore, stopped at the gear box side mount  604  side cover  6041  area such that the strap puller wheel  603  along the same axis as the gear box side mount  604  cannot go downward, furthermore, the strap puller wheel  603  is disengaged from enmeshment with anti-slip block  605 , thereby precluding unintentional contact with the air pressure control valve  90  first switch  901  such that when the strap puller motor  608  is driven, direct abrasion and damage cannot occur between said strap puller wheel  603  and the anti-slip block  605 . 
     Of course, since the horizontally oriented arcuate slot  6073  is formed in the lower end of said strapping plate  607 , as per actual utilization requirements, the user can tighten it with the screw  6074  to achieve the most suitable positioning and thereby maintain stationary placement.

Technology Category: 7