Membrane strapping apparatus

Abstract

A membrance strapping apparatus includes a hold-pull rod pivotally connected with a membrance release unit and a roller unit. A pulling-force adjusting unit is provided between the hold-pull rod and the roller unit and the membrance release unit is provided with a shaft rod for supporting a membrance roll. Thus, a user can conveniently make use of the membrance strapping apparatus to release membrance for carrying out strapping operation. The pulling-force adjusting unit can be operated for controlling pivotal rotation angles of the roller unit to enable a user to adjust directions and tightness of strapping in accordance with practical need and assist the user to conveniently complete strapping work for firmly strapping an article.

What is claimed is: 
     
         1 . A membrance strapping apparatus comprising:
 a hold-pull rod, said hold-pull rod having two ends respectively extending to a same direction to form a combination rod and a base, said combination rod bored with a first positioning hole and a first fixing hole, said combination rod provided thereon with a quick-detaching member, said base disposed with a second positioning hole and a second fixing hole;   a membrance release unit, said membrance release unit pivotally assembled between said base and said combination rod, said membrance release unit provided with a shaft rod, said shaft rod having two ends respectively formed with a first positioning member and a second positioning member respectively corresponding to said first positioning hole and said second positioning hole, said memberance release unit pivotally combined with said base and said combination rod by said first positioning member and said second positioning member;   a roller unit, said roller unit assembled between said base and said combination rod, said roller unit composed of a first roller and a second roller, said first roller and said second roller having their same ends respectively fixed with a first gear and a second gear, said first gear meshed with said second gear, said first roller and said second roller having their outer sides respectively cover with a housing; and   a pulling-force adjusting unit, said pulling-force adjusting unit positioned between said hold-pull rod and said roller unit, said pulling force adjusting unit comprising a positioning member, an elastic member and a control member, said elastic member having a fixed end connected with said hold-pull rod, said positioning member connected a free end of said elastic member, said positioning member able to be positioned on said hold-pull rod by elastic force of said elastic member, said control member connected with both said positioning member and said roller unit.   
     
     
         2 . The membrance strapping apparatus as claimed in  claim 1 , wherein said quick-detaching member consists of a spring and a shaft cover, said spring received in said first positioning hole and connected with said shaft cover, said shaft cover fitted on said first positioning member by resilience of said spring. 
     
     
         3 . The membrance strapping apparatus as claimed in  claim 1 , wherein said shaft rod of said membrance release unit has a circumferential side fixed thereon with a plurality of tightening sheets. 
     
     
         4 . The membrance strapping apparatus as claimed in  claim 1 , wherein number of gear teeth of said first gear is more than that of said second gear, and gear ratio of said first gear and said second gear is between 1.1 and 1.3. 
     
     
         5 . The membrance strapping apparatus as claimed in  claim 1 , wherein said roller unit contains a first connecting rod and a second connecting rod, which are respectively set in said first roller and said second roller, said first connecting rod and said first roller being coaxial, said second connecting rod and said second roller provided coaxially, said first connecting rod and said second connecting rod respectively having their two ends protruding out of said housings, said first connecting rod having two ends respectively and pivotally combined with said first fixing hole and said second fixing hole, said second connecting rod secured with said housings. 
     
     
         6 . The membrance strapping apparatus as claimed in  claim 1 , wherein said positioning member is a positioning ring, said positioning member provided with a plurality of positioning recesses corresponding to said combination rod, said elastic member is a spring, said elastic member received in said first fixing hole, said control member being a control rod, said control rod having one end connected with said housing adjacent to a location of said second roller and another end connected with said positioning ring. 
     
     
         7 . The membrance strapping apparatus as claimed in  claim 1 , wherein said membrance release unit includes a first position-limiting block and a second position-limiting block, said first position-limiting block having a central portion bored with a threaded hole, said shaft rod having one end provided with male threads at an outer circumferential side, said second position-limiting block disposed with a position-limiting hole corresponding to another end of said shaft rod. 
     
     
         8 . The membrance strapping apparatus as claimed in  claim 7 , wherein said first position-limiting block has one side secured with a first position-limiting stud and said second position-limiting block having one end fixed with a second position-limiting stud, said first position-limiting stud and said second position-limiting stud having their circumferential sides respectively formed with stepped surfaces. 
     
     
         9 . The membrance strapping apparatus as claimed in  claim 1 , wherein said base with a combination hole at a location corresponding to one side of said combination rod, said hold-pull rod having one end formed with a threaded hole corresponding to said combination hole, said membrance strapping apparatus comprising a telescopic rod, said telescopic rod having one end correspondingly inserted in said combination hole of said base, said telescopic rod threadably combined with said threaded hole of said hold-pull rod.