Binding machine

Abstract

A reinforcing bar binding machine (1A) includes: a body part (10); a wire feeding part (3) that feeds a wire; an arm part (50) that protrudes from the body part in one direction and curls the fed wire; a curl guide part (51) that is provided apart from the arm part in the other direction; and a binding part (7) that twists the curled wire. The arm part comprises an outer inclined surface (53a) that is inclined outward from a tip portion (50b) of the arm part and an inner inclined surface (54) that is inclined inward from the tip portion, with respect to an arm tip center line that is parallel to a twist axis of the binding part and passes through the tip portion.

Description

Tying machine

[0001] The present invention relates to a tying machine for tying tying objects such as reinforcing bars with a wire.

[0002] Reinforcing bars are used in concrete structures to improve strength, and are tied with wires so that the reinforcing bars do not shift from their predetermined positions 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 passes, is inserted between the arranged reinforcing bars, and the wire wound around the reinforcing bars sent by the driving force of a motor is twisted by a tying portion rotated by the driving force of the motor, whereby the reinforcing bars are tied with the wire (see, for example, Patent Documents 1 and 2).

[0005] Japanese Patent Application Laid-Open No. 2003-64876, Japanese Patent Application Laid-Open No. 2006-193979

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

[0007] The present invention has been made to solve such problems, and an object thereof is to provide a tying machine that enables an arm portion to be easily inserted between arranged reinforcing bars.

[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.

[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.

[0010] This is a side view of the internal configuration of an example of a rebar tying machine according to this embodiment. This is a side cross-sectional view of the main part of an example of a rebar tying machine according to this embodiment. This is an external side view of an example of a rebar tying machine according to this embodiment. This is an external perspective view of an example of a rebar tying machine according to this embodiment. This is an external perspective view of an example of a rebar tying machine according to this embodiment.

[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 of this embodiment> Figure 1 is an internal configuration diagram viewed from the side, showing an example of the rebar tying machine of this embodiment. Figure 2 is a side cross-sectional view of the main part, showing an example of the rebar tying machine of this embodiment. Figure 3 is an external side view showing an example of the rebar tying machine of this embodiment. Figures 4 and 5 are external perspective views showing an example of the rebar tying machine of this embodiment.

[0013] The rebar tying machine 1A is designed to be held and used by an operator, 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, then feeds the wire W in the reverse direction indicated by arrow R to wrap it around the rebar S, twists the wire W, and ties 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] Magazine 2 is an example of a storage unit, in which a reel 20, on which a long wire W is wound so that it can be dispensed, is stored in a rotatable and detachable manner. The wire W can be made of a metal wire that can be plastically deformed, a metal wire coated with resin, or a stranded wire. In a configuration in which two wires W are used to tie together reinforcing bars S, the reel 20 is wound with two wires W, and the two wires W can be pulled out from the reel 20 simultaneously.

[0016] The wire feeding unit 3 is equipped with a pair of feed gears 30 that grip and feed the wire W. The rotational motion of a feed motor (not shown) is transmitted to the feed gears 30, causing the feed gears 30 to rotate. The wire feeding unit 3 can also switch the rotation direction of the feed gears 30 by switching the forward and reverse rotation direction of the feed motor (not shown), thereby switching the forward and reverse feeding direction of the wire W. In a configuration in which two wires W are used to tie together reinforcing bars S, the wire feeding unit 3 feeds the two wires W side by side in the radial direction of the wires W.

[0017] The wire guide section 4 is positioned upstream and downstream of the feed gear 30 with respect to the feeding direction of the wire W being fed in the forward direction. In a configuration in which two wires W are used to tie together a reinforcing bar S, the wire guide section 4 guides the two incoming wires W in parallel along the direction in which the pair of feed gears 30 are aligned, between the pair of feed gears 30.

[0018] The curl-forming section 5 includes an arm section 50 that gives the wire W, which is fed by the wire feeding section 3, a curl guide section 51 that guides the wire W, which has been given a curl by the arm section 50, to the binding section 7.

[0019] The cutting unit 6 comprises a fixed blade section 60, a movable blade section 61 that cuts the wire W in cooperation with the fixed blade section 60, and a transmission mechanism 62 that transmits the operation of the binding unit 7 to the movable blade section 61. The cutting unit 6 cuts the wire W by the rotational movement of the movable blade section 61 with the fixed blade section 60 as the pivot axis.

[0020] The binding section 7 includes a wire locking body 70 into which the wire W is locked, and a sleeve 71 that operates the wire locking body 70. The drive section 8 includes a torsion motor 80 and a reduction gear 81 that performs reduction and torque amplification.

[0021] The rebar tying machine 1A has a handle 11 that extends downward from the main body 10. Furthermore, a battery 15 is detachably attached to the lower part of the handle 11. In addition, the rebar tying machine 1A has a magazine 2 located in front of the handle 11.

[0022] In the rebar tying machine 1A, the tip of the magazine 2 is positioned behind the straight line L3 that passes through the tip of the arm section 50 and the tip of the curl guide section 51. This prevents the magazine 2 from coming into contact with the rebars S arranged in a grid pattern.

[0023] The rebar tying machine 1A has a trigger 12 on the front side of the handle 11. The control unit 100 controls the twisting motor 80 and the feed motor (not shown) according to the state of a switch (not shown) that is pressed by the operation of the trigger 12 of the rebar tying machine 1A.

[0024] Furthermore, the rebar tying machine 1A is equipped with abutment sections 91 at the front of the main body 10A against which the rebar S abuts. The abutment sections 91 are provided in pairs on the left and right sides between the arm section 50 and the curl guide section 51.

[0025] <Example of the configuration of the curl-forming section of this embodiment> Next, the details of the curl-forming section 5 of this embodiment will be described.

[0026] The arm portion 50 protrudes from the main body portion 10 in the direction indicated by arrow A. The curl guide portion 51 protrudes from the main body portion 10 in the direction indicated by arrow A, and is also provided spaced apart from the arm portion 50 in the other direction indicated by arrow B, which intersects with the direction indicated by arrow A.

[0027] The curl-forming section 5 creates a curl in the wire W that is fed by the wire feeding section 3 and passes through the arm section 50, and then guides the wire W, which has been curled by the arm section 50, 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 for the wire W to pass through is formed between the pair of side portions 52b and 52c. The bottom surface of the groove portion 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 facing 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 center line L2 of the arm tip 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, for example, composed of 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 has 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, and the distance between it and the curl guide portion 51 widens. 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 in a direction approaching 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 be either an arc shape with a convex tip portion 50b, or a flat shape along 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. The inclination angle α1 is set to be greater than 0°, and preferably greater than 25° from the viewpoint of making it easier to recognize the position of the reinforcing bars. 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. The inclination angle α2 is set to be greater than 0°.

[0040] The arm portion 50 includes a wire relief portion 55 at the tip of the groove portion 50a. The arm portion 50 is configured such that the tip side of the groove forming portion 52a is shorter than the pair of side surfaces 52b and 52c, and a groove shape through which the wire W can pass toward the tip portion 50b of the arm portion 50 is formed in the pair of side surfaces 52b and 52c, and the wire relief portion 55 is formed.

[0041] The curl forming portion 5 may be fixed to the main body portion 10, or may be attached to the main body portion 10 so as to be movable in a direction of approaching and separating from the arm portion 50. For example, the curl forming portion 5 may be attached to the main body portion 10 in a state where it can rotate about the end portion of the main body portion 10 as a fulcrum and is biased in a direction approaching the arm portion 50.

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

[0043] In the case of a configuration in which the steel bar S is bound with two wires W, the two wires W are fed in a state of being arranged in parallel along the axial direction of the annular feed path Ru by the wire feed portion 3 and the wire guide portion 4.

[0044] The wire W fed in the positive direction passes through the wire locking body 70 of the binding portion 7 and is fed to the arm portion 50 of the curl forming portion 5. By passing through the arm portion 50, the wire W is given a winding habit of being wound around the steel bar S along the annular feed path Ru.

[0045] The wire W with a winding habit formed by the arm portion 50 is further fed in the positive direction by the wire feed portion 3, is guided to the curl guide portion 51, and is guided to the binding portion 7 by the curl guide portion 51.

[0046] When the wire W is further fed in the positive direction by the wire feed portion 3, the wire W passes through the wire locking body 70 and 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 locking body 70 locks the wire W. As a result, the rotation of the torsion motor 80 is converted into linear movement, and the sleeve 71 moves in the direction of arrow C1 which is the forward direction. 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 feeding motor is driven in the reverse rotation direction.

[0049] As a result, the pair of feeding gears 30 reverses, and the wire W sandwiched between the pair of feeding gears 30 is fed in the reverse direction indicated by arrow R. In the operation of feeding the wire W in the reverse direction, the wire W is wound around the reinforcing bar S.

[0050] After winding the wire W around the reinforcing bar S and stopping the driving of the feeding motor in the reverse rotation direction, the torsion motor 80 is driven in the forward rotation direction, so that the sleeve 71 moves further in the forward direction indicated by arrow C1. The operation of the sleeve 71 moving forward is transmitted to the cutting portion 6 by the transmission mechanism 62, so that the movable blade portion 61 rotates, and a predetermined position of the wire W is cut by the operations of the fixed blade portion 60 and the movable blade portion 61.

[0051] By driving the torsion motor 80 in the forward rotation direction to move the sleeve 71 in the forward direction indicated by arrow C1 to cut the two wires W, almost simultaneously, the wire W is pushed forward by the wire locking body 70, and the tip side and the terminal side of the wire W are bent toward the reinforcing bar S side.

[0052] After bending the tip side and the terminal side of the wire W toward the reinforcing bar S side, the torsion motor 80 is further driven in the forward rotation direction, so that the sleeve 71 moves further forward. When the sleeve 71 moves to a 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 feeding 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 feeding speed is greater than or equal to the wire feeding speed when feeding the wire W in the forward direction, but less than the wire feeding speed when feeding the wire W in the reverse direction and wrapping it around the rebar S.

[0056] <Example of the effect of the curl-forming part 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 points 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 points 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 provided 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 L1, 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 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 L1. 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 54a, 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.

[0069] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. Furthermore, the components of the above embodiments may be combined in any way without departing from the spirit of the invention.

[0070] This application is based on Japanese Patent Application No. 2024-171451 filed on September 30, 2024, and its contents are incorporated herein by reference.

[0071] 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 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 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, which is parallel to the twist axis of the binding portion that twists the wire.

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

3. The strapping machine according to claim 1, wherein 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.

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

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

6. The binding machine according to claim 1, wherein 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 of the arm.

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

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

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

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

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

12. The binding machine according to claim 1, wherein 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 portion through which the wire passes, and the tip of the groove portion has a wire relief portion.

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