Patent ID: 7377212

Claim:
An automatic band conveying device installed inside a main body of a strapping machine and using a band transmitting device to pass a band through a band rail that is elastically installed on said main body, said band rail comprising a -shaped separating portion, a L-shaped blocking plate fixed on the main body, a band rail groove formed adjustable between the separating portion and the blocking plate, and a compression spring is placed between the separating portion and the blocking plate, said automatic band conveying device comprising a pressing rail device composed of a main gate, an electromagnetic valve, a connecting rod and a pressing plate: said main plate is fixed on said main body and said main plate provided with a positioning plate and two extended ears extended out respectively from its top side and its bottom side; said electromagnetic valve provided with a positioning member that is fixed on said main plate, a movable member pivotally fixed on said positioning member and able to be magnetically attracted to have a displacement by said positioning member; said connecting rod provided with a supporter that is pivotally fixed on said main plate, a first end of said connecting rod located at one side of said supporter is connected to said movable member of said electromagnetic valve, a second end of said connecting rod is mutually moved together with said pressing plate; and said pressing plate provided with a supporting member that is pivotally fixed on one of the extended ears, a driving side formed at one side of said supporting member for moving together with said second end of said connecting rod, a pressing side formed at another side of said supporting member for leaning the -shaped separating portion of said band rail, said driving side provided with a sliding groove that is concaved at a preset portion of said driving side for corresponding to said second end of said connecting rod.