End machine

Abstract

The present invention provides a rebar tying machine that allows the arm to be easily inserted between the installed rebars. [Solution] The rebar tying machine 1A includes a main body 10 having a gripping part, a wire feeding part 3 for feeding wire W, an arm part 50 protruding from the main body 10 in one direction for curling the wire W fed by the wire feeding part 3, a curl guide part 51 protruding from the main body 10 in one direction and spaced apart from the arm part 50 in another direction intersecting the one direction, and a tying part 7 provided on the main body 10 for twisting the curled wire W. The arm part 50 is parallel to the twist axis L1 of the tying part 7 and includes an outer inclined surface 53a that slopes outward from the tip 50b with respect to the arm tip center line L2 that passes through the tip 50b of the arm part 50, and an inner inclined surface 54 that slopes inward from the tip 50b.

Description

Technical Field

[0001] The present invention relates to a tying machine for tying a bundle of reinforcing bars or the like with a wire.

Background Art

[0002] In concrete structures, reinforcing bars are used to improve the strength, and they are tied with wires so that the reinforcing bars do not shift from a predetermined position during concrete placement.

[0003] Conventionally, a tying machine called a reinforcing bar tying machine has been proposed, in which a wire is wound around two or more reinforcing bars, and the wire wound around the reinforcing bars is twisted to tie the two or more reinforcing bars with the wire.

[0004] The tying machine is held by an operator by hand, and while visually recognizing an arm portion through which a wire called a nose or the like passes, it is inserted between the arranged reinforcing bars, and the wire wound around the reinforcing bars and sent by the driving force of a motor is twisted by a tying portion that rotates by the driving force of the motor, so that the reinforcing bars are tied with the wire (see, for example, Patent Documents 1 and 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a conventional tying machine, when an operator holds the tying machine by hand and views it from the rear side, which is the side opposite to the arm portion through the main body portion, the visibility of the arm portion (nose) is poor, and it is difficult to insert the arm portion from the tip between the arranged reinforcing bars.

[0007] This invention was made to solve these problems, and aims to provide a binding machine that allows the arm to be easily inserted between the arranged reinforcing bars. [Means for solving the problem]

[0008] To solve the above-mentioned problems, the present invention provides a binding machine comprising: a main body having a gripping portion; a wire feeding portion provided on the main body for feeding wire; an arm portion protruding from the main body in one direction for curling the wire fed by the wire feeding portion; a curl guide portion protruding from the main body in one direction and spaced apart from the arm portion in another direction intersecting the one direction; and a binding portion provided on the main body for twisting the curled wire, wherein the arm portion is parallel to the twist axis of the binding portion for twisting the wire and has an outer inclined surface that slopes outward from the tip and an inner inclined surface that slopes inward from the tip with respect to the center line of the arm tip passing through the tip of the arm portion. [Effects of the Invention]

[0009] In this invention, the arm portion can be easily inserted linearly from its tip into the space between the installed reinforcing bars, making it easier to position the intersection of the reinforcing bars between the arm portion and the curl guide portion. Furthermore, even if the tip of the arm portion comes into contact with the reinforcing bar, the inwardly inclined surface is guided along the reinforcing bar, making it easier to position the intersection of the reinforcing bars between the arm portion and the curl guide portion. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of the internal configuration of an example of a rebar tying machine according to this embodiment. [Figure 2] This is a side cross-sectional view of a key part, showing an example of a rebar tying machine according to this embodiment. [Figure 3] This is an external side view showing an example of a rebar tying machine according to this embodiment. [Figure 4] This is an external perspective view showing an example of a rebar tying machine according to this embodiment. [Figure 5] This is an external perspective view showing an example of a rebar tying machine according to this embodiment. [Modes for carrying out the invention]

[0011] Hereinafter, with reference to the drawings, an example of a rebar tying machine as an embodiment of the tying machine of the present invention will be described.

[0012] <Example of the configuration of the rebar tying machine according to this embodiment> Figure 1 is a side view of the internal structure of an example of the rebar tying machine of this embodiment, Figure 2 is a side view of the main part of an example of the rebar tying machine of this embodiment, and Figure 3 is an external side view of an example of the rebar tying machine of this embodiment. Figures 4 and 5 are external perspective views of an example of the rebar tying machine of this embodiment.

[0013] The rebar tying machine 1A is designed to be held and used by a worker, and comprises a main body 10 and a handle 11 that serves as a gripping part. The rebar tying machine 1A feeds the wire W in the forward direction indicated by arrow F, wraps it around the rebar S to be tied, feeds the wire W in the reverse direction indicated by arrow R to wrap it around the rebar S, then twists the wire W to tie the rebar S with the wire W. The rebar tying machine 1A ties the rebar S with multiple wires W, in this example, two wires W.

[0014] To achieve the functions described above, the rebar tying machine 1A includes a magazine 2 for storing wire W, a wire feeding unit 3 for feeding wire W, and a wire guide unit 4 for guiding the wire W being fed to the wire feeding unit 3. The rebar tying machine 1A also includes a curl forming unit 5 that forms an annular feeding path for winding the wire W fed by the wire feeding unit 3 around the rebar S, and a cutting unit 6 for cutting the wire W wrapped around the rebar S. Furthermore, the rebar tying machine 1A includes a tying unit 7 for twisting the wire W wrapped around the rebar S, and a drive unit 8 for driving the tying unit 7.

[0015] The magazine 2 is an example of a storage part, in which a reel 20 around which a long wire W is wound so as to be unreeled is rotatably and removably stored. The wire W is a wire made of a metal wire capable of plastic deformation, a wire in which the metal wire is coated with resin, or a stranded wire. In a configuration where two wires W are used to bind the reinforcing bar S, the reel 20 has two wires W wound thereon and is configured to be able to pull out the two wires W simultaneously from the reel 20.

[0016] The wire feeding part 3 includes a pair of feeding gears 30 that sandwich and feed the wire W. In the wire feeding part 3, the rotational operation of a feeding motor (not shown) is transmitted to the feeding gears 30, causing the feeding gears 30 to rotate. Also, the wire feeding part 3 can switch the forward and reverse directions of the rotational direction of the feeding motor (not shown), thereby switching the rotational direction of the feeding gears 30 and switching the forward and reverse directions of the feeding direction of the wire W. In a configuration where two wires W are used to bind the reinforcing bar S, the wire feeding part 3 feeds the two wires W side by side in the radial direction of the wire W.

[0017] The wire guide part 4 is arranged on the upstream side and the downstream side of the feeding gears 30 with respect to the feeding direction of the wire W fed in the forward direction. In a configuration where two wires W are used to bind the reinforcing bar S, the wire guide part 4 aligns the two incoming wires W in parallel along the direction in which the pair of feeding gears 30 are arranged and guides them between the pair of feeding gears 30.

[0018] The curl forming part 5 includes an arm part 50 that gives a curl to the wire W fed by the wire feeding part 3, and a curl guide part 51 that guides the wire W with a curl formed by the arm part 50 to the binding part 7.

[0019] The cutting part 6 includes a fixed blade part 60, a movable blade part 61 that cuts the wire W in cooperation with the fixed blade part 60, and a transmission mechanism 62 that transmits the operation of the binding part 7 to the movable blade part 61. The cutting part 6 cuts the wire W by the rotational operation of the movable blade part 61 with the fixed blade part 60 as a fulcrum shaft.

[0020] The end portion 7 includes a wire locking body 70 to which the wire W is locked and a sleeve 71 that actuates the wire locking body 70. The drive unit 8 includes a torsion motor 80 and a speed reducer 81 that performs deceleration and torque amplification.

[0021] In the reinforcing bar tying machine 1A, the handle portion 11 extends downward from the main body portion 10. Further, a battery 15 is detachably attached to the lower portion of the handle portion 11. Also, in the reinforcing bar tying machine 1A, a magazine 2 is provided in front of the handle portion 11.

[0022] The tip of the magazine 2 of the reinforcing bar tying machine 1A is positioned rearward of a straight line L3 passing through the tip of the arm portion 5 and the tip of the curl guide portion 51. Thereby, contact between the magazine 2 and the reinforcing bars S arranged in a lattice pattern is suppressed.

[0023] In the reinforcing bar tying machine 1A, a trigger 12 is provided on the front side of the handle portion 11. The control unit 100 controls the torsion motor 80 and a feed motor (not shown) according to the state of a switch (not shown) that is pushed by the operation of the trigger 12.

[0024] Also, the reinforcing bar tying machine 1A includes a abutting portion 91 against which the reinforcing bar S abuts, provided at the front portion of the main body portion 10A. The abutting portions 91 are provided in a pair on the left and right between the arm portion 50 and the curl guide portion 51.

[0025] <Configuration example of the curl forming portion of the present embodiment> Next, the details of the curl forming portion 5 of the present embodiment will be described.

[0026] The arm portion 50 projects from the main body portion 10 in one direction indicated by the arrow A. The curl guide portion 51 projects from the main body portion 10 in one direction indicated by the arrow A and is provided spaced apart from the arm portion 50 in another direction indicated by the arrow B that intersects the one direction.

[0027] The curl-forming section 5 creates a coil in the wire W that is fed by the wire feeding section 3 and passes through the arm section 50, and then guides the coiled wire W to the binding section 7 with the curl guide section 51. As a result, the curl-forming section 5 forms a feeding path for the wire W, as shown by the dashed line, from the arm section 50 through the curl guide section 51 to the binding section 7. The feeding path for the wire W from the arm section 50 through the curl guide section 51 to the binding section 7 is called the annular feeding path Ru.

[0028] The arm portion 50 comprises a groove-forming portion 52a and a pair of side portions 52b and 52c. The groove-forming portion 52a is sandwiched between the side portions 52b and 52c of the arm portion 50, and a groove portion 50a having a width sufficient for the wire W to pass through is formed between the pair of side portions 52b and 52c. The bottom surface of the groove 50a is formed by the groove-forming portion 52a, and it extends along the circumferential direction of the annular feeding path Ru, regulating the position of the wire W that is moving outward with respect to the radial direction of the annular feeding path Ru. In a configuration in which two wires W are used to tie together a reinforcing bar S, the arm portion 50 aligns the two incoming wires W in parallel between the pair of side portions 52b and 52c in a direction that is aligned along the axial direction of the annular feeding path Ru.

[0029] The arm portion 50 is parallel to the twist axis L1 of the binding portion 7, which passes through the axis of the wire locking body 70 and sleeve 71 that twist the wire W in a rotational motion, and includes an outer inclined surface 53a that inclins outward from the tip portion 50b and an inner inclined surface 54a that inclins inward from the tip portion 50b, with respect to the arm tip center line L2 that passes through the tip portion 50b of the arm portion 50.

[0030] In the configuration where the rebar tying machine 1A is used with the twist axis L1 in a horizontal orientation, the outer inclined surface 53a is composed of, for example, a straight slope that inclines upward from the tip portion 50b with respect to the center line of the arm tip. The inner inclined surface 54a is composed of, for example, a straight slope that inclines downward from the tip portion 50b with respect to the center line of the arm tip.

[0031] The arm portion 50 is continuous with the outer inclined surface 53a and includes an outer surface portion 53b that extends linearly toward the base end portion 50c of the arm portion 50. The outer surface portion 53b is composed of, for example, a surface parallel to the torsion axis L1.

[0032] The arm portion 50 is shaped to move away from the torsion axis L1 as it approaches the base end portion 50c, and is equipped with an inner surface portion 54b facing the curl guide portion 51. In the configuration in which the rebar tying machine 1A is used with the torsion axis L1 in a horizontal orientation, the inner surface portion 54b is composed of a straight slope that inclines upward as it approaches the base end portion 50c, widening the gap with the curl guide portion 51. The inner surface portion 54b may extend to the base end portion 50c of the arm portion 50, or it may extend to a position away from the base end portion 50c by a distance approximately equal to the radius of the rebar S.

[0033] The arm portion 50 is located between the outer surface portion 53b and the main body portion 10 and has an outer base end surface 53c that inclins toward the torsion axis L1 as it approaches the base end portion 50c. The outer base end surface 53c is composed of an upright slope that is visible when the rebar tying machine 1A is viewed from the rear along the direction indicated by arrow A. For this reason, the inclination angle of the outer base end surface 53c with respect to the torsion axis L1 is greater than the inclination angle of the outer inclined surface 53a with respect to the torsion axis L1.

[0034] The arm portion 50 is configured such that the thickness T between the outer surface connected to the outer inclined surface 53a and the inner surface connected to the inner inclined surface 54a is substantially constant, from the tip portion 50b to the base portion 50c.

[0035] The arm portion 50 is configured to have a curved shape with a convex tip portion 50b, or a flat shape aligned with a direction intersecting the torsion axis L1.

[0036] The arm portion 50 has a convex corner portion 54c on its inner surface connected to the inner inclined surface 54a. The arm portion 50 also has an inner reverse inclined surface 54d on its inner surface connected to the corner portion 54c, which is inclined in the opposite direction to the inner inclined surface 54a and connected to the inner surface portion 54b.

[0037] The arm portion 50 is composed of an outer inclined surface 53a and an inner reverse inclined surface 54d which are substantially parallel, and an outer surface portion 53b and an inner surface portion 54b which are substantially parallel. Even if the inner surface portion 54b is inclined upward towards the base end portion 50c, the inclination angle of the inner surface portion 54b with respect to the torsion axis L1 is smaller than the inclination angle of the inner reverse inclined surface 54d, and the outer surface portion 53b and the inner surface portion 54b are considered to be substantially parallel.

[0038] Furthermore, regarding the thickness T between the outer surface and the inner surface of the arm portion 50, as the inner surface portion 54b is inclined upward toward the base end portion 50c, the thickness T2 of the portion where the outer surface portion 53b is formed becomes narrower than the thickness T1 of the portion where the outer inclined surface 53a is formed. However, if the inclination angle of the inner surface portion 54b with respect to the torsion axis L1 is small within the predetermined range described above, it is considered to be approximately constant.

[0039] The arm portion 50 is configured such that the inclination angle α1 of the inner inclined surface 54a with respect to the torsion axis L1, that is, the inclination angle α1 of the inner inclined surface 54a with respect to the center line L2 of the arm tip, is 45° or less. Furthermore, the arm portion 50 is configured such that the inclination angle α2 of the outer inclined surface 53a with respect to the torsion axis L1, that is, the inclination angle α2 of the outer inclined surface 53a with respect to the center line L2 of the arm tip, is 45° or less.

[0040] The arm portion 50 is provided with a wire relief portion 55 at the tip of the groove portion 50a. The tip side of the groove forming portion 52a of the arm portion 50 is shorter than the pair of side portions 52b and 52c, and the wire relief portion 55 is formed in the pair of side portions 52b and 52c in a groove shape that allows the wire W to pass through toward the tip portion 50b of the arm portion 50.

[0041] The curl-forming portion 51 may be fixed to the main body portion 10, or it may be attached to the main body portion 10 so as to be movable in a direction toward or toward the arm portion 50. For example, the curl-forming portion 51 may be attached to the main body portion 10 so as to be rotatable with the end of the main body portion 10 as a pivot point, and biased toward the arm portion 50.

[0042] <Example of the rebar tying operation of the rebar tying machine of this embodiment> When the reinforcing bar S is placed between the arm portion 50 and the curl guide portion 51 of the curl forming portion 5 and the trigger 12 is operated, a feed motor (not shown) is driven in the forward rotation direction, and the wire W, which is held by a pair of feed gears 30, is fed in the forward direction indicated by the arrow F.

[0043] In a configuration where reinforcing bars S are bound together with two wires W, the wire feeding unit 3 and the wire guide unit 4 feed the two wires W in parallel along the axial direction of the annular feeding path Ru.

[0044] The wire W, which is fed in the forward direction, passes through the wire locking body 70 of the binding section 7 and is fed to the arm section 50 of the curl forming section 5. As the wire W passes through the arm section 50, it acquires a curl that causes it to wrap around the reinforcing bar S along the annular feeding path Ru.

[0045] The wire W, which has been coiled in the arm section 50, is further fed in the forward direction by the wire feeding section 3, which guides it to the curl guide section 51, and then to the binding section 7 in the curl guide section 51.

[0046] As the wire W is further fed in the forward direction by the wire feeding unit 3, the wire W passes through the wire locking body 70, and when the tip of the wire W is fed to a predetermined position, the drive of the feed motor (not shown) is stopped.

[0047] After stopping the forward feeding of the wire W, the torsion motor 80 is driven in the forward rotation direction. The rotation of the sleeve 71 is restricted in the operating range where the wire W is locked by the wire locking body 70. As a result, the rotation of the torsion motor 80 is converted into linear motion, and the sleeve 71 moves in the forward direction, arrow C1. When the sleeve 71 moves forward, the wire W is locked by a predetermined operation of the wire locking body 70.

[0048] After advancing the sleeve 71 to the position where the wire W is locked by the wire locking body 70, the rotation of the torsion motor 80 is temporarily stopped and the feed motor is driven in the reverse direction.

[0049] This causes the pair of feed gears 30 to reverse direction, and the wire W, which is held between the pair of feed gears 30, is fed in the opposite direction indicated by arrow R. This reverse feeding motion of the wire W causes it to wrap around the reinforcing bar S.

[0050] After the wire W is wrapped around the reinforcing bar S and the reverse rotation of the feed motor is stopped, the torsion motor 80 is driven in the forward rotation direction, causing the sleeve 71 to move further forward as indicated by arrow C1. The forward movement of the sleeve 71 is transmitted to the cutting section 6 by the transmission mechanism 62, causing the movable blade section 61 to rotate, and the wire W is cut at a predetermined position by the operation of the fixed blade section 60 and the movable blade section 61.

[0051] By driving the torsion motor 80 in the forward rotation direction, the sleeve 71 is moved forward as indicated by arrow C1, cutting the two wires W. Almost simultaneously, the wire locking body 70 pushes the wires W forward, bending the tip and end ends of the wires W toward the reinforcing bars S.

[0052] After the tip and end of the wire W are bent toward the reinforcing bar S, the torsion motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to move further forward. Once the sleeve 71 has moved to the predetermined position, the restriction on the rotation of the sleeve 71 is released.

[0053] As a result, the torsion motor 80 is driven further in the forward rotation direction, causing the sleeve 71 to rotate and initiating the twisting of the wire W locked by the wire locking body 70. When it is detected that the load on the torsion motor 80 has reached its maximum due to the twisting of the wire W, the forward rotation of the torsion motor 80 is stopped. Next, when the torsion motor 80 is driven in the reverse rotation direction, the sleeve 71 moves in the direction of arrow C2, which is the rear direction, with its rotation restricted.

[0054] When the sleeve 71 moves backward, the wire locking body 70 releases the wire W from being locked, and the wire W that has tied the reinforcing bar S comes out of the wire locking body 70. Once the wire W that has tied the reinforcing bar S comes out of the wire locking body 70, it becomes possible to remove the arm portion 50 and the curl guide portion 51 from the point where the wire W is tied.

[0055] In the rebar tying machine 1A, the wire feed speed is faster when feeding the wire W in the reverse direction and wrapping it around the rebar S than when feeding the wire W in the forward direction. However, for the first tying operation after loading the reel 20, or the first tying operation after turning on the power, the tying speed may be controlled so that in subsequent tying operations, the wire feed speed is greater than or equal to the wire feed speed when feeding the wire W in the forward direction, but less than the wire feed speed when feeding the wire W in the reverse direction and wrapping it around the rebar S.

[0056] <Examples of the effects of the curl-forming portion of this embodiment> The arm portion 50 is parallel to the torsion axis L1 and includes an outer inclined surface 53a that inclins outward from the tip portion 50b with respect to the arm tip center line L2 that passes through the tip portion 50b of the arm portion 50, and an inner inclined surface 54a that inclins inward from the tip portion 50b.

[0057] This configuration makes it easier to insert the arm portion 50 linearly from the tip portion 50b into the grid-like arrangement of reinforcing bars S, and makes it easier to position the intersection of the reinforcing bars S between the arm portion 50 and the curl guide portion 51. Even if the tip portion 50b comes into contact with a reinforcing bar S, the inner inclined surface 54a is guided along the reinforcing bar S, making it easier to position the intersection of the reinforcing bars S between the arm portion 50 and the curl guide portion 51.

[0058] Furthermore, the arm portion 50 is continuous with the outer inclined surface 53a and includes an outer surface portion 53b that extends linearly toward the base end portion 50c of the arm portion 50. This allows the direction in which the rebar tying machine 1A should be moved to be indicated by the extension direction of the outer surface portion 53b, thereby improving the visibility of the arm portion 50.

[0059] Furthermore, the arm portion 50 is shaped to move away from the torsion axis L1 as it approaches the base end portion 50c of the arm portion 50, and is equipped with an inner surface portion 54b that faces the curl guide portion 51, thereby making it less likely for the reinforcing bar S placed between the arm portion 50 and the curl guide portion 51 to come into contact with the arm portion 50.

[0060] Furthermore, the arm portion 50 is located between the outer surface portion 53b and the main body portion 10, and has an outer base end surface 53c that inclins toward the torsion axis L1 as it approaches the base end portion 50c of the arm portion 50. This makes it easier to recognize the position of the outer surface portion 53b when viewing the rebar tying machine 1A from the rear side of the main body portion 10, and makes it easier to recognize the direction in which the rebar tying machine 1A should be moved.

[0061] Furthermore, the arm portion 50 is configured such that the inclination angle of the outer base end surface 53c with respect to the torsion axis L1 is greater than the inclination angle of the outer inclined surface 53a with respect to the torsion axis, making it easier to recognize the position of the outer surface portion 53b.

[0062] Furthermore, the arm portion 50 is configured such that the thickness between the outer surface connected to the outer inclined surface 53a and the inner surface connected to the inner inclined surface 54a is substantially constant from the tip portion 50b to the base portion 50c. This prevents the gap between the arm portion 50 and the curl guide portion 51 from narrowing even at the base portion 50c side of the arm portion 50, thereby securing space for inserting the reinforcing bar S between the arm portion 50 and the curl guide portion 51. Moreover, by moving the reinforcing bar tying machine 1A in a linear motion, the reinforcing bar S can be inserted until it abuts against the abutment portion 91, while preventing contact between the reinforcing bar S and the arm portion 50.

[0063] Furthermore, the arm portion 50 is configured such that its tip portion 50b is flat or arc-shaped along a direction intersecting the torsion axis L2. This prevents damage to the arm portion 50 when it comes into contact with an obstacle such as the ground on the back side of the reinforcing bar S being worked on.

[0064] Furthermore, by providing the arm portion 50 with a convex corner portion 54c on the inner surface connected to the inner inclined surface 53a, the inner surface of the arm portion 50 becomes easier to see, and contact between the reinforcing bar S and the arm portion 50 near the inner inclined surface 54a can be suppressed.

[0065] Furthermore, the arm portion 50 is configured such that the inclination angle of the inner inclined surface 54a with respect to the torsion axis L1 is 45° or less. This ensures that even if the inner inclined surface 54a comes into contact with the reinforcing bar S, the inner inclined surface 54a is guided along the reinforcing bar S, making it easier to position the intersection of the reinforcing bars S between the arm portion 50 and the curl guide portion 51.

[0066] Furthermore, the arm portion 50 is configured such that the inclination angle of the outer inclined surface 53a with respect to the torsion axis L1 is 45° or less, resulting in a tapered shape at the tip of the arm portion 50, which makes it easier to insert the arm portion 50 linearly from the tip portion 50b into the grid-like arrangement of reinforcing bars S.

[0067] Furthermore, the arm portion 50 is provided with an inner inverted inclined surface 54d on the inner surface connected to the corner portion 54c, which is inclined in the opposite direction to the inner inclined surface 54a. This prevents the reinforcing bar S from getting caught on the inner surface of the arm portion 50 when pulling it out from between the arm portion 50 and the curl guide portion 51.

[0068] Furthermore, the arm portion 50 is equipped with a wire relief portion 55 at the tip of the groove portion 50a. This allows the wire W to escape from the wire relief portion 55 toward the outside of the annular feeding path Ru even if an obstacle such as the ground is present on the back side of the reinforcing bar S being worked on and the wire W comes into contact with the obstacle and cannot be fed normally. This prevents the wire W from getting stuck in the binding portion 7 or the like. [Explanation of Symbols]

[0069] 1A... Rebar tying machine, 10... Main body, 11... Handle (gripping part), 2... Magazine, 20... Reel, 3... Wire feeding part, 30... Feed gear, 5... Curl forming part, 50... Arm part, 50a... Groove part, 50b... Tip part, 50c... Base end part, 51... Curl guide part, 52a... Groove forming part, 52b, 52c... Side parts, 53a... Outer inclined surface, 53b... Outer surface, 53c... Outer base end surface, 54a... Inner inclined surface, 54b... Inner surface, 54c... Corner part, 54d... Inner reverse inclined surface, 6... Cutting part, 7... Tying part, 8... Drive part, Ru... Annular feeding path, W... Wire

Claims

1. A main body having a gripping portion, The main body is provided with a wire feeding unit for feeding wires, An arm portion that protrudes from the main body in one direction and causes the wire fed by the wire feeding section to curl, A curl guide portion is provided that protrudes from the main body in one direction and is spaced apart from the arm portion in another direction intersecting the one direction, The main body is provided with a binding section for twisting a wire that has been given a coiled shape, The aforementioned arm portion is The binding portion that twists the wire has an outer inclined surface that slopes outward from the tip and an inner inclined surface that slopes inward from the tip, with respect to the center line of the arm tip that passes through the tip of the arm portion, parallel to the twist axis of the binding portion that twists the wire. Binding machine.

2. The arm portion has an outer surface that is continuous with the outer inclined surface and extends linearly toward the base end of the arm portion. The binding machine according to claim 1.

3. The arm portion has a shape that moves away from the torsion axis as it approaches the base end of the arm portion, and has an inner surface portion that faces the curl guide portion. The binding machine according to claim 1.

4. The arm portion is located between the outer surface portion and the main body portion, and has an outer base end surface that slopes toward the torsion axis as it approaches the base end of the arm portion. The binding machine according to claim 2.

5. The inclination angle of the outer base end surface with respect to the torsion axis is set to be greater than the inclination angle of the outer inclined surface with respect to the torsion axis. The binding machine according to claim 4.

6. The arm portion is configured such that the thickness between the outer surface connected to the outer inclined surface and the inner surface connected to the inner inclined surface is constant, from the tip to the base end. The binding machine according to claim 1.

7. The tip portion is configured to be flat or arc-shaped along a direction intersecting the torsion axis. The binding machine according to claim 1.

8. The arm portion has a convex corner on the inner surface that connects to the inner inclined surface. The binding machine according to claim 1.

9. The inclination angle of the inner inclined surface with respect to the torsion axis is configured to be 45° or less. The binding machine according to claim 1.

10. The inclination angle of the outer inclined surface with respect to the torsion axis is configured to be 45° or less. The binding machine according to claim 1.

11. The arm portion has an inner inverted inclined surface on the inner surface connected to the corner portion, which is inclined in the opposite direction to the inner inclined surface. The binding machine according to claim 8.

12. The arm portion has a groove-forming portion and a pair of side portions, and between the pair of side portions there is a groove through which a wire passes, and the tip of the groove portion has a wire relief portion. The binding machine according to claim 1.

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