Structure portable strapping machine

An improved structure portable strapping machine in which a band is articulated via a strap pulling device, a swinging device, and a cutting device and then bound tight by a friction welding means to facilitate strapping objects of various shapes and dimensions that are difficult to ship. As such, utilization of the improved structure portable strapping machine of the present invention is easy, convenient, rapid, reliable, and safe.

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.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring toFIG. 1,FIG. 2, andFIG. 3, the improved structure portable strapping machine of the invention herein is comprised of:

A main body10having a cylinder101at its upper end, and an open, downward oriented passage102at its lower end, a guide hole103contiguously disposed between said cylinder101and passage102, and an outer cover11attached to its top section, wherein said outer cover11has a sleeve hole111at the center and an air chamber112is formed around the sleeve hole111.

A plurality of elastic components20installed inside the cylinder101at the upper end of the main body10.

A piston component30fitted into the cylinder101at the upper end of the main body10by means of a sealing ring301and resiliently supported upward at the lower end by the elastic components20, a locating post302projecting upward from the center, said locating post302also capable of sliding in the sleeve hole111of the outer cover11at the main body10top end, a blind hole303at the center, and an air guide hole304disposed at the lower end of said blind hole303that is in continuity with the exterior.

A cutting device40consisting of a blade401that slides along one side wall104at the lower end of the main body10, a large through-hole4011disposed in the center section, a locating slot4012near the upper end, and a saw-toothed cutting edge4013along the bottom end; an elastic component402installed in the locating slot4012near the top end of the blade401; a drive rod403, the upper end of which is attached to the piston30with the lower end inserted through the locating slot4012near the upper end of the blade401and supported by the elastic component402such that tensive downward pressure is always applied to the blade401.

A swinging device50consisting of a rocker arm501situated in the passage102at the lower end of the main body10and concealed inside a side cover12disposed lateral to the lower end of the main body10, the upper extremity of which is inserted into the main body10guide hole103and hinged to a locating pin5011at the piston30, and an elongated guide hole5012formed near the lower extremity; an upper friction block502capable of swaying to the left and right that is hinged to the lower extremity of the rocker arm501; an eccentric rod503, the eccentric section5031at the middle portion of which is situated at the elongated guide hole5012near the lower extremity of the rocker arm501, with a bearing5032installed against its circumferential surface via the elongated guide hole5012such its two ends are in a pivotable state at the side cover12at the lower end of the main body10and the side wall104; a drive motor504situated at the exterior lateral extent of the side wall104at the lower end of the main body10and aligned over the cutting device40blade401, the center shaft5041of which penetrates the blade401through-hole4011and is then installed to the eccentric rod503such that the rotation of the eccentric rod503causes the leftward and rightward swaying of the rocker arm501and the upper friction block502installed at the lower extremity of the rocker arm501.

A strap pulling device60consisting of a base601situated at the bottom section of the main base10that has a locating arm6011extending upward from one side and an arcuate guide hole6012formed at the lower extent of the locating arm6011; a gear box602that includes a screw6021capable of swaying upward and downward which is insertionally positioned at the locating arm6011at one side of the base601and enmeshed with an internally disposed worm gear6022and worm shaft6023, wherein said locating worm gear6022shaft6024is also inserted through the locating arm6011arcuate guide hole6012; a strap puller wheel603at the opposite side and upper extent of the base601situated with the worm gear6022on the same shaft6024; a gear box side mount604situated with the gear box602on the same screw6021insertionally positioned at the base601locating arm6011, the lower end of which provides for the insertional positioning of a worm gear6022as well as a strap puller wheel603shaft6024, and a side cover6041over the anterior upper extent of the strap puller wheel603; an anti-slip block605installed at the base601aligned with the puller wheel603; a lower friction block606installed at the base601aligned with the swinging device50upper friction block502; a strapping plate607, the upper end of which is pivotably installed on the surface at the front end of the base locating arm6011with a locating screw6071and capable of swaying freely having an elastic component6072(can be a return spring) at the locating screw6071, with one end of said elastic component6072resting against inner side of the strapping plate607such that the strapping plate607is always subjected to tensive force towards the strap puller wheel603and a horizontally oriented arcuate slot6073is formed in the lower end, said horizontally oriented arcuate slot6073providing for the insertion of a screw6074that is fastened to the surface at the front end of the base locating arm6011; and a strap puller motor608of long tubular shape installed at one end of the gear box602that directly drives the worm shaft6023and enables the rotation of the enmeshed worm gear6022, the shaft6024, and the strap puller wheel603.

An elastic component70installed at one side of the main body10, the lower end of which directly supports the surface at the upper end of the gear box602such that the strap puller motor608, the gear box602, the strap puller wheel603, and the gear box side mount604are always subjected to tensive downward pressure via the fulcrum of the base601locating arm6011.

A handle80disposed at one side of the main base10and situated at the upper extent of the long tubular-shaped strap puller motor608that provides for the manual upward and downward turning of the strap puller motor608, the gear box602, the strap puller wheel603, and the gear box side mount604.

An air pressure control valve90installed at the rear end of the main base10that is controlled by a plurality of switches901,902, and903, through which compressed air is respectively conveyed to a main body1air duct A (seeFIG. 3), a drive motor504air intake port5042(seeFIG. 2), and a strap puller motor608air pipe B to the air chamber112in the outer cover11at the upper end of the main body10, the swinging device50drive motor504, and the strap pulling device60strap puller motor608, thereby controlling the operation of the cutting device40, the swinging device50, and the strap pulling device60.

Utilizing said structure of the invention herein, referring again toFIG. 4, after the operator wraps a PET plastic band K around a strapped object E, the thumb of one hand is placed on the handle80and the remaining four fingers grasp the strap pulling device60strap puller motor608to turn it upward, causing said strap pulling device60gear box602, strap puller wheel603, and gear box side mount604to each travel upward on the screw6021serving as the axial point at the base locating arm6011such that said strap puller wheel603is swung upward, following which a large interval results due to its disengaged enmeshment from the anti-slip block605; utilizing said piston30that is normally subject to the decompression of the elastic components20and thereby shoved upward to the top dead center point, the upper friction block502of said swinging device50rocker arm501and the blade401of the cutting device40drive rod403are 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 device60base601, thereby positioning it at the lower extent of the strap puller wheel603, the upper friction block502, and the blade401; referring toFIG. 5andFIG. 6, after the band K overlaid section K′ is definitely positioned at the lower extent of the strap puller wheel603, the upper friction block502, and the blade401, the operator lowers the strap puller motor608, causing said strap puller wheel603to exert downward pressure on the band K and utilizing the elastic component70installed at one side of said main body10that always exerts tensive pressure against the upper end of the strap pulling device60gear box602, when said strap puller motor608lowered such that the strap puller wheel603is pressed down, the overlaid section K′ is subjected to elastic pressure and directly clutched by the strap puller wheel603and the anti-slip block605; when the operator presses the first switch901of the air pressure control valve90and thereby causes compressed air to power the strap pulling device60strap puller motor608, the motive force is transferred via the worm shaft6023, the worm gear6022, and the shaft6024to the strap puller wheel603such that the top layer of the overlaid section K′ is directly contacted and pressed by the strap puller wheel603and thereby drawn and shifted tight; after band K winding operation around the strapped object E is completed, the operator releases the first switch901of the air pressure control valve90and next presses the second switch902, causing said compressed air to simultaneously enter the air chamber112(seeFIG. 6) in the outer cover11of the main body10to power the swinging device50drive motor504as well as the main body cylinder101to provide compression for the downward movement of the piston30inside, thereby pressing down the upper friction block502of swinging device50rocker arm501hinged at its lower end such that after its said downward movement, the upper friction block502tensively contacts the top layer of the overlaid section K′ and, at the same time, the motive force of the eccentric rod503powered by drive motor504is transferred to the rocker arm501such that the upper friction block502hinged to the lower end of said rocker arm501is impelled to sway rapidly to the left and the right, the rapid rubbing of the overlaid section K′ top layer by the upper friction block502generating high heat that directly welds it to the overlaid bottom layer into a single structural entity.

In said description, when the cylinder30is impelled downward and the swinging device50welds the band K overlaid section K′, since said cutting device40drive rod403is similarly attached to the cylinder30and moves down with it, and the blade401insertionally positioned at the drive rod403is supported by the elastic component402and also capable of moving downward under tensive pressure to contact the top layer of the band K overlaid section K′, since the blade401cutting edge4013is saw-toothed, and said top layer of the band K overlaid section K′ is subjected to the swaying operation of the swinging device50upper friction block502and the consequent rapid leftward and rightward rubbing, the saw-toothed edge of the blade401rapidly 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 device50upper friction block502, tightness is maintained and it remains fixed, said blade401not 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 switch902of the air pressure control valve90and next presses the third switch903and since the swinging device50drive motor504is thereafter no longer driven and air is discharged from the air chamber112in the outer cover11of the main body, as indicated inFIG. 3, said cylinder30is resiliently returned by the elastic component20, the upper friction block502and the cutting device40blade401also moving upward and returning away from the strapping band K.

Referring toFIG. 7, an adjustment screw6015is installed in the bottom section at one side of said strap pulling device60base601, with the exposed said adjustment screw6015against the gear box602bottom section capable of high and low adjustment such that when the operator releases the strap puller motor608and the gear box602as well as the strap puller wheel603such that both are pressed downward, the exposed height adjustment of said adjustment screw6015causes the gear box602and the strap puller wheel603to be pressed downward a certain range, enabling the strap puller wheel603to 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 screw6015, said strap puller wheel603can 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 toFIG. 8andFIG. 9, since the strapping plate607installed on the surface at the front end of the base601locating arm6011is subjected to the tensive force of the elastic component6072and always subjected to tensive force towards the strap puller wheel603, when the band K wrapped around the strapped object E is pulled into the strap pulling device60base and situated at the lower extent of the strap puller wheel603, the elastically loaded strapping plate607is directly pushed inward by the band K with a locating screw6071serving as the axial point, thereby fully impelling the strap puller wheel603to the band K. Conversely, referring toFIG. 10andFIG. 11, when the strap puller motor608is turned upward and consequently nudges the strap puller wheel603up such that it is disengaged from enmeshment with the anti-slip block605and the band K does not enter the lower extent of the strap puller wheel603, since said strapping plate607is always elastically pressured towards the strap puller wheel603, it is not pushed inward by the band K and gear box side mount604rises upward, but automatically elastically pressured towards the strap puller wheel603and, furthermore, stopped at the gear box side mount604side cover6041area such that the strap puller wheel603along the same axis as the gear box side mount604cannot go downward, furthermore, the strap puller wheel603is disengaged from enmeshment with anti-slip block605, thereby precluding unintentional contact with the air pressure control valve90first switch901such that when the strap puller motor608is driven, direct abrasion and damage cannot occur between said strap puller wheel603and the anti-slip block605.

Of course, since the horizontally oriented arcuate slot6073is formed in the lower end of said strapping plate607, as per actual utilization requirements, the user can tighten it with the screw6074to achieve the most suitable positioning and thereby maintain stationary placement.