Reinforcing bar binding machine

• Main Author: Shindou, Shigeki
• Format: Patent
• Language: English
• Published: 27.01.2023
• Subjects: BUILDING; BUILDING IMPLEMENTS OR OTHER BUILDING AIDS, OR THEIRUSE; CONVEYING; FIXED CONSTRUCTIONS; FORMS; HANDLING BUILDING MATERIALS ON THE SITE; HANDLING THIN OR FILAMENTARY MATERIAL; MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGINGARTICLES OR MATERIALS; PACKING; PERFORMING OPERATIONS; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTINGBUILDINGS; SCAFFOLDING; SHUTTERING; STORING; TRANSPORTING; UNPACKING

Curling mechanisms provided for the guide part of known reinforcing bar binding machines have a number of problems. First, it is difficult to form a constant curl diameter of the wire that is to be wound around the reinforcing bars into a loop shape. Second, the components for curling are always rubbed by the steel wire and are thus worn. Third, the wear increases a feeding resistance of the wire, so that the wire feeding is not smoothly performed. Fourth, the curling function is weakened due to the wear during the repeating use, so that the curl diameter of the wire increases. Finally, the components may be hardened against the wear. In a particular aspect the present invention provides a reinforcing bar binding machine which is configured to detachably mount a wire reel thereto, to feed a wire from the mounted wire reel, to feed the wire to a guide part provided at a tip portion of a binding machine main body, to curl the wire at the guide part, to feed the wire around reinforcing bars positioned at an inner side of the guide part so that the wire is wound around the reinforcing bars, to cut the wire and to twist the wire to thus bind the reinforcing bars, wherein the guide part comprises: a guiding part that is configured to guide feeding of the wire from the wire reel; a cutting part that is configured to cut the wire after a predetermined length of the wire is fed from the guiding part; a curl guide that is configured to guide the wire fed from the guiding part or the cutting part so as to curl the fed wire; a first guide member that is configured to be in contact with an outer surface which is an outer side of the wire to be bent and configured to curl the wire; a second guide member that is configured to be in contact with an inner surface which is an inner side of the wire to be bent and configured to curl the wire; and a third guide member that is configured to be in contact with an outer surface which is an outer side of the wire to be bent and configured to curl the wire, wherein the first guide member, the second guide member and the third guide member are arranged in order from the guiding part, and wherein any one of the first guide member, the second guide member and the third guide member serves as the cutting part.