Patent ID: 7073431
Filing Date: 2006-07-11
Classification: B65B

Abstract:
1. An improved structure portable strapping machine comprised of: a main body having a cylinder at an upper end, an open and downwardly oriented passage at a lower end, a guide hole contiguously disposed between said cylinder and said passage, and an outer cover attached to a top section of said main body, wherein said outer cover has a sleeve hole at a center thereof and an air chamber is formed around said sleeve hole; a plurality of elastic components installed inside said cylinder at the upper end of said main body; a piston component situated in a sealed state within said cylinder at the upper end of said main body and resiliently supported upwardly at the lower end by said elastic components and a locating post projecting upward from the center, said locating post being slidable in said sleeve hole of said outer cover at the upper end of said main body; a cutting device consisting of a blade that slides along one side wall at the lower end of said main body, a large through-hole disposed in a center section of the blade, a locating slot near an upper end of the blade, and a saw-toothed cutting edge along a bottom end of the blade; an elastic component installed in said locating slot near the top end of said blade; a drive rod having an upper end attached to said piston with a lower end of the drive rod inserted through said locating slot near the upper end of said blade and supported by said elastic component such that tensive downward pressure is always applied to said blade; a swinging device consisting of a rocker arm situated in said passage at the lower end of said main body and concealed inside a side cover disposed lateral to the lower end of said main body, an upper extremity of said rocker arm being inserted into said main body guide hole and hinged to a locating pin at said piston, and an elongated guide hole being formed near a lower extremity of said rocker arm; an upper friction block being hinged to the lower extremity of said rocker arm; an eccentric rod having an eccentric section at a middle portion thereof being situated at said elongated guide hole near the lower extremity of said rocker arm; a drive motor situated at an exterior lateral extent of said side wall at the lower end of said main body and aligned over said cutting device blade, the drive motor having a center shaft that penetrates said blade through-hole and is then installed to said eccentric rod such that the rotation of said eccentric rod causes a leftward and rightward swaying of said upper friction block installed at the lower extremity of said rocker arm; a strap pulling device consisting of a base situated at the a bottom section of said main body and having a locating arm extending upwardly from one side and an arcuate guide hole formed at a lower extent of said locating arm; a gear box including a screw extending through said locating arm at one side of said base, and an internally disposed worm gear enmeshed with a worm shaft, wherein a shaft of said worm gear is also inserted through said locating arm arcuate guide hole; a strap puller wheel at an opposite side and upper extent of said base being situated with said worm gear on said shaft of said worm gear; a gear box side mount being situated with said gear box on said screw extending through said locating arm, a lower end of said gear box side mount providing for the insertional positioning of said worm gear as well as said strap puller wheel shaft, and a side cover over an anterior upper extent of said strap puller wheel; an anti-slip block installed at said base aligned with said swinging device upper friction block; a lower fiction block installed at said base aligned with said swinging device upper friction block; a strap puller motor of long tubular shape being installed at one end of said gear box that directly drives said worm shaft and enables rotation of the enmeshed said worm gear, the shaft, and the strap puller wheel; an elastic component installed at one side of said main body and having a lower end directly supporting a surface at an upper end of said gear box such that said strap puller motor, said gear box, said strap puller wheel, and said gear box side mount are always subjected to tensive downward pressure via a fulcrum of said base locating arm; a handle disposed at one side of said main body and situated at an upper extent of the long tubular shaped of said strap puller motor that provides for the manual upward and downward turning of said strap puller motor, said gear box, said strap puller wheel and said gear box side mount; an air pressure control valve installed at a rear end of the said main body being controlled by a plurality of switches through which compressed air is respectively conveyed to an air duct of said main body, an air intake port of said drive motor, and an air pipe of said strap puller motor to said air chamber in said outer cover at the upper end of said main body, said swinging device drive motor, and said strap pulling device strap puller motor, thereby controlling operation of said cutting device, said swinging device, and said strap pulling device; said strap pulling device has a strapping plate, an upper end of said strapping plate being pivotally installed on a surface at a front end of said base locating arm and being freely swayable, and always subjected to the tensive force of an elastic component towards said strap puller wheel, and a horizontally oriented arcuate slot being formed in a lower end of said strapping plate, said horizontally oriented arcuate slot providing for the insertion of a screw that is fastened to said locating arm.