Binding machine

Abstract

A binding machine includes: a curl forming portion configured to form an annular feeding path for winding the wire fed by a wire feeding portion around a to-be-bound object; and a binding portion configured to twist the wire wound on the to-be-bound object. The curl forming portion includes an arm part configured to curl the wire fed by the wire feeding portion, and a curl guide part configured to guide the wire curled by the arm part to the binding portion. The curl guide part includes a bottom surface portion on a radially outer side of the annular feeding path. The bottom surface portion includes a guiding portion forming at least a part of a tip portion side of the curl guide part and configured to guide a tip of the wire toward a base end portion side of the curl guide part.

What is claimed is: 
     
         1 . A binding machine comprising:
 a wire feeding portion configured to feed a wire;   a curl forming portion configured to form an annular feeding path for winding the wire fed by the wire feeding portion around a to-be-bound object; and   a binding portion configured to twist the wire wound on the to-be-bound object, wherein   the curl forming portion comprises
 an arm part configured to curl the wire fed by the wire feeding portion, and 
 a curl guide part configured to guide the wire curled by the arm part to the binding portion, 
   the curl guide part comprises a bottom surface portion on a radially outer side of the annular feeding path, and   the bottom surface portion comprises a guiding portion forming at least a part of a tip portion side of the curl guide part and configured to guide a tip of the wire toward a base end portion side of the curl guide part.   
     
     
         2 . A binding machine comprising:
 a wire feeding portion configured to feed a wire;   a curl forming portion configured to form an annular feeding path for winding the wire fed by the wire feeding portion around a to-be-bound object; and   a binding portion configured to twist the wire wound on the to-be-bound object, wherein   the curl forming portion comprises
 an arm part configured to curl the wire fed by the wire feeding portion, and 
 a curl guide part configured to guide the wire curled by the arm part to the binding portion, 
   the curl guide part comprises a bottom surface portion on a radially outer side of the annular feeding path,   the bottom surface portion comprises a guiding portion forming at least a part of a tip portion side of the curl guide part,   the guiding portion has an inclined surface inclined with respect to the bottom surface portion in a direction in which a first end portion on the tip portion side of the curl guide part becomes closer to the arm part than a second end portion on a base end portion side of the curl guide part, and   the inclined surface is configured such that a dimension of the first end portion with respect to the second end portion is longer in a direction parallel to a virtual extension line of the bottom surface portion than in a direction orthogonal to the virtual extension line of the bottom surface portion.   
     
     
         3 . The binding machine according to  claim 1 , wherein the guiding portion has an inclined surface inclined with respect to the bottom surface portion on a trajectory along which the tip of the wire passes. 
     
     
         4 . The binding machine according to  claim 2 , wherein a cross-sectional shape of the inclined surface in a direction parallel to the annular feeding path is a straight line shape. 
     
     
         5 . The binding machine according to  claim 2 , wherein
 the binding portion comprises a wire locking body to which the wire is to be locked, and   the inclined surface is inclined toward the wire locking body.   
     
     
         6 . The binding machine according to  claim 2 , wherein the inclined surface is inclined with respect to the bottom surface portion such that an entering angle of the wire with respect to the inclined surface just before the tip of the wire comes into contact with the inclined surface becomes 50° or less. 
     
     
         7 . The binding machine according to  claim 2 , wherein an angle of the inclined surface with respect to the bottom surface portion is 50° or less. 
     
     
         8 . The binding machine according to  claim 2 , wherein the curl guide part comprises side surface portions provided on both sides in an axial direction of the annular feeding path with respect to the bottom surface portion and the inclined surface. 
     
     
         9 . The binding machine according to  claim 8 , wherein a gap between the inclined surface and the side surface portion is equal to or less than a diameter of the wire. 
     
     
         10 . The binding machine according to  claim 1 , wherein
 the curl guide part is provided at the tip portion with a width-expanding portion where a width of the bottom surface portion along an axial direction of the annular feeding path narrows toward the base end portion, and   the guiding portion is provided on at least a part of the width-expanding portion on the tip portion side of the curl guide part.   
     
     
         11 . The binding machine according to  claim 1 , wherein a radial length of the annular feeding path formed by the curl forming portion is 100 mm or longer. 
     
     
         12 . The binding machine according to  claim 1 , comprising an inclined portion inclined with respect to the bottom surface portion in a direction toward the binding portion on the base end portion side of the curl guide part with respect to the bottom surface portion, wherein
 the guiding portion, the bottom surface portion, and the inclined portion are configured to guide the tip of the wire toward the base end portion side of the curl guide part.   
     
     
         13 . The binding machine according to  claim 2 , comprising an inclined portion inclined with respect to the bottom surface portion in a direction toward the binding portion on the base end portion side of the curl guide part with respect to the bottom surface portion.