End machine

Abstract

To provide a reinforcement binding machine that stabilizes a wire position along an axial direction of an annular feed path in the feed path for a wire fed from a curl guide by wire feeding by a wire feed section.SOLUTION: A reinforcement binding machine 1A has a magazine 2A to store a reel 20 around which a wire W is wound, a curl formation section 5A to wind the wire W fed by a wire feed section around a reinforcement, and a binding section 7A to twist the wire W wound around the reinforcement. The curl formation section 5A has a curl guide 50a to curl the wire W and an induction guide 50b to guide the wire W curled by the curl guide 50a to the binding section 7A. The magazine 2A is disposed by being offset in a first direction based on the curl guide 50a. The curl guide 50a has a delivery direction guide section 57 having an outlet part 57a for the wire W so that the outlet part is inclined in a direction toward the first direction.SELECTED DRAWING: Figure 1D

Description

Technical Field

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

Background Art

[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] Therefore, there is proposed a tying machine called a reinforcing bar tying machine that includes a feeding means capable of feeding a wire and winding it around a reinforcing bar, and a tying means for tying the reinforcing bar by gripping and twisting the wire wound around the bundle by the feeding means, thereby winding the wire around two or more reinforcing bars and twisting the wire wound around the reinforcing bars to tie the two or more reinforcing bars with the wire (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When the diameter of the reinforcing bar to be tied increases, it is necessary to increase the diameter of the feeding path of the wire wound annularly around the reinforcing bar. However, when the diameter of the annular wire feeding path increases, the position of the wire along the axial direction of the annular feeding path varies within the feeding path of the wire fed out from the curl guide by the wire feeding section.

[0006] This variation increases as the diameter of the annular feed path increases. Also, because the wire housing is offset in one direction relative to the curl guide, the wire fed from the housing and coiled by the curl guide will move in the opposite direction to the one in which the housing is offset. As a result, there is a possibility that the wire will not enter the guide. On the other hand, if the guide is made larger to allow the wire to enter the guide, it may worsen operability due to the increased size and weight of the binding machine.

[0007] The present invention was made to solve these problems, and aims to provide a bundling machine that stabilizes the position of the wire along the axial direction of the annular feeding path within the wire feeding path of the wire fed from the curl guide by the wire feeding section. [Means for solving the problem]

[0008] To solve the above-mentioned problems, the present invention provides a binding machine comprising a storage section for storing wire, a wire feeding section for feeding the wire stored in the storage section, a curl forming section that forms an annular feeding path for winding the wire fed by the wire feeding section around the bundled object, and a binding section for twisting the wire wound around the bundled object. The curl forming section comprises a curl guide for giving the wire fed by the wire feeding section a curl, and a guide for guiding the wire that has been given a curl by the curl guide to the binding section. The storage section is positioned offset in one direction with respect to the curl guide, and the curl guide is a binding machine that feeds the wire in one direction.

[0009] Because the housing is positioned offset in one direction relative to the curl guide, the wire fed from the housing and coiled by the curl guide is directed in the other direction, which is the opposite direction to the one in which the housing is offset.

[0010] In this invention, when a wire that has been coiled by a curl guide is fed out in one direction, the amount of displacement of the wire moving in the other direction relative to the curl guide can be reduced compared to the case where the wire is not fed out in one direction. [Effects of the Invention]

[0011] In this invention, the wire, which has been coiled in the curl guide, is fed in one direction, so that even if the diameter of the annular feeding path is large, multiple wires can be fed from the curl guide into the guide guide. As a result, there is no need to enlarge the guide guide, which suppresses the increase in the size and weight of the binding machine and prevents deterioration of operability. [Brief explanation of the drawing]

[0012] [Figure 1A] This is a side view of the internal configuration, showing an example of the overall configuration of the rebar tying machine according to the first embodiment. [Figure 1B] This is an internal diagram viewed from the front, showing an example of the overall configuration of a rebar tying machine according to the first embodiment. [Figure 1C] This is a side view showing an example of the overall configuration of a rebar tying machine according to the first embodiment. [Figure 1D] This is a front view showing an example of the overall configuration of a rebar tying machine according to the first embodiment. [Figure 2A] This is a side view showing an example of a curl guide. [Figure 2B] This is a top view showing an example of a curl guide. [Figure 2C] This is a bottom view showing an example of a curl guide. [Figure 2D] This is a front view showing an example of a curl guide. [Figure 2E] This is a side view showing an example of a curl guide with some parts removed. [Figure 2F] This is a front cross-sectional view showing an example of a curl guide. [Figure 2G] This is a perspective view of a key component showing an example of the parallel-oriented guidance section of a curl guide. [Figure 2H] It is a cross-sectional view showing an example of a delivery direction guiding portion of a curl guide. [Figure 3] It is a perspective view showing an example of a cutting portion. [Figure 4A] It is a cross-sectional plan view showing an example of a bundling portion and a driving portion. [Figure 4B] It is a cross-sectional plan view showing an example of a bundling portion and a driving portion. [Figure 5A] It is a perspective view showing an example of an operation of cutting a wire at a cutting portion. [Figure 5B] It is a perspective view showing an example of an operation of cutting a wire at a cutting portion. [Figure 5C] It is a perspective view showing an example of an operation of cutting a wire at a cutting portion. [Figure 5D] It is a perspective view showing an example of an operation of cutting a wire at a cutting portion. [Figure 6A] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6B] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6C] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6D] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6E] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6F] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6G] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 6H] It is a side cross-sectional view of a main part showing an example of an operation of a steel bar bundling machine according to the first embodiment. [Figure 7A] It is a side view showing an example of an operation of guiding the direction in which wires are parallel in a curl guide. [Figure 7B] It is an enlarged side view of a main part showing an example of an operation of guiding the direction in which wires are parallel in a curl guide. [Figure 7C] This is an enlarged perspective view of a key part showing an example of how a curl guide guides wires to be aligned in parallel. [Figure 7D] This is a cross-sectional view of a key part showing an example of the operation of guiding the wire in the wire delivery direction guidance section. [Figure 8A] This is a front cross-sectional view of a curl guide showing an example of the operation and effect of the rebar tying machine of this embodiment. [Figure 8B] This is a front cross-sectional view of a curl guide, illustrating an example of the problems with conventional rebar tying machines. [Figure 9] This is a front view showing an example of the main components of a rebar tying machine according to a second embodiment. [Figure 10A] This is a side view showing another example of a curl guide. [Figure 10B] This is a top view showing another example of a curl guide. [Figure 10C] This is a bottom view showing another example of a curl guide. [Figure 10D] This is a front view showing another example of a curl guide. [Figure 11A] This is a side view showing another example of a curl guide. [Figure 11B] This is a top view showing another example of a curl guide. [Figure 11C] This is a front view showing another example of a curl guide. [Modes for carrying out the invention]

[0013] 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.

[0014] <Example of the configuration of the rebar tying machine according to the first embodiment> Figure 1A is a side view showing an example of the overall configuration of the rebar tying machine of the first embodiment, Figure 1B is a front view showing an example of the overall configuration of the rebar tying machine of the first embodiment, Figure 1C is a side view showing an example of the overall configuration of the rebar tying machine of the first embodiment, and Figure 1D is a front view showing an example of the overall configuration of the rebar tying machine of the first embodiment.

[0015] The rebar tying machine 1A is designed to be held and used by the worker, and comprises a main body 10A and a handle 11A. 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.

[0016] To achieve the functions described above, the rebar tying machine 1A includes a magazine 2A for storing wires W, a wire feeding unit 3A for feeding two wires W side by side in the radial direction of the wires W, and a wire guide 4A for guiding the two wires W fed to the wire feeding unit 3A. The rebar tying machine 1A also includes a curl forming unit 5A that forms an annular feeding path for winding the two wires W fed by the wire feeding unit 3A around the rebar S, and a cutting unit 6A for cutting the two wires W wrapped around the rebar S. Furthermore, the rebar tying machine 1A includes a tying unit 7A for twisting the two wires W wrapped around the rebar S, and a drive unit 8A for driving the tying unit 7A.

[0017] Magazine 2A is an example of a storage compartment, in which a reel 20 on which a long wire W is wound so as to 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.

[0018] The reel 20 comprises a cylindrical hub portion 21 around which the wire W is wound, and a pair of flange portions 22 and 23 integrally provided on both axial ends of the hub portion 21. The flange portions 22 and 23 are roughly disc-shaped with a larger diameter than the hub portion 21 and are provided concentrically with the hub portion 21. The reel 20 is designed so that two wires W are wound around the hub portion 21, and two wires W can be pulled out from the reel 20 simultaneously.

[0019] As shown in Figure 1D, the rebar tying machine 1A is positioned such that the magazine 2A is offset in a first direction indicated by arrow C1, which is one direction relative to the curl guide 50a of the curl forming section 5A, which will be described later. As a result, as shown in Figure 1B, the reel 20 of the rebar tying machine 1A is mounted in a state offset in the first direction indicated by arrow C1, along the axial direction of the reel 20 which is aligned with the axial direction of the hub section 21, relative to the wire feeding path FL defined by the wire feeding section 3A and wire guide 4A.

[0020] The wire feeding section 3A is equipped with a pair of feed gears 30 (30L, 30R) that grip and feed two parallel wires W. The rotational motion of the feed motor 31 is transmitted to one of the feed gears 30L in the wire feeding section 3A. Furthermore, the rotational motion of one feed gear 30L is transmitted to the other feed gear 30R through the meshing of gear parts provided on the outer circumference of the feed gears 30L and 30R. As a result, one feed gear 30L is the driving side and the other feed gear 30R is the driven side.

[0021] The wire feeding section 3A arranges two wires W in parallel along the direction in which the pair of feed gears 30L and 30R are aligned. In the wire feeding section 3A, one wire W contacts the groove of one feed gear 30L, and the other wire W contacts the groove of the other feed gear 30R, so that the two wires W contact each other. As a result, the wire feeding section 3A feeds the two wires W, which are sandwiched between the pair of feed gears 30 (30L, 30R), along the direction in which the wires W extend, due to the frictional force generated between one feed gear 30L and one wire W, the frictional force generated between the other feed gear 30R and the other wire W, and the frictional force generated between the two wires W, as the pair of feed gears 30 (30L, 30R) rotate.

[0022] Furthermore, the wire feeding section 3A switches the rotation direction of the feed gear 30 by switching the rotation direction of the feed motor 31, thereby switching the forward and reverse direction of the wire W being fed.

[0023] The wire guides 4A are positioned upstream and downstream of the feed gear 30 with respect to the feed direction of the wire W being fed in the forward direction. The wire guides 4A guide 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.

[0024] The wire guide 4A is configured such that the upstream opening has a larger opening area than the downstream opening in the forward feeding direction of the wire W, and part or all of the inner surface of the opening is tapered. This makes it easy to insert the wire W, which has been pulled out from the reel 20 stored in the magazine 2A, into the wire guide 4A.

[0025] The curl-forming section 5A includes a curl guide 50a that sets a curl in the two wires W fed by the wire feeding section 3A and restricts the direction in which the two wires W are parallel, and a guide guide 50b that guides the two wires W, which have been set with a curl by the curl guide 50a, to the binding section 7A. The curl-forming section 5A sets a curl in the two wires W that are fed by the wire feeding section 3A and pass through the curl guide 50a, thereby forming an annular feeding path Ru as shown by the dashed line in Figure 1, which passes from the curl guide 50a through the guide guide 50b to the binding section 7A. The curl guide 50a causes the two wires W to pass through the annular feeding path Ru in an aligned radial direction. The curl guide 50a also guides the two wires W so that they are aligned radially along the annular feeding path Ru.

[0026] The cutting section 6A 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 section 7A to the movable blade section 61. The cutting section 6A cuts the wire W by the rotational movement of the movable blade section 61 with the fixed blade section 60 as the pivot axis. In addition, the cutting section 6A guides the two wires W so that they are aligned radially along the annular feed path Ru when cutting two wires W.

[0027] The binding section 7A 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 8A includes a motor 80 and a reduction gear 81 that performs reduction and torque amplification.

[0028] The rebar tying machine 1A is equipped with a feed restricting section 90 at the end of the feed path of the wire W, which passes through the annular feed path Ru and is locked by the wire locking body 70, so that the tip of the wire W abuts against it. The rebar tying machine 1A also has the curl guide 50a and guide guide 50b of the curl forming section 5A described above provided at the front end of the main body 10A. Furthermore, the rebar tying machine 1A has a stopper section 91 against which the rebar S abuts, provided at the front end of the main body 10A, between the curl guide 50a and the guide guide 50b. The rebar tying machine 1A is also equipped with a protrusion 56 on the curl guide 50a so that the main body 10A can receive the force applied to the curl guide 50a. The protrusion 56 is provided on the main body 10A side of the curl guide 50a, and is configured to protrude in the direction of the main body 10A so that it can contact the main body 10A.

[0029] The rebar tying machine 1A has a handle section 11A that extends downward from the main body section 10A. Furthermore, a battery 15A is detachably attached to the lower part of the handle section 11A. The rebar tying machine 1A also has a magazine 2A located in front of the handle section 11A. The rebar tying machine 1A houses the wire feeding section 3A, cutting section 6A, tying section 7A, and the drive section 8A that drives the tying section 7A, etc., as described above, in the main body section 10A.

[0030] The rebar tying machine 1A has a trigger 12A on the front of the handle 11A and a switch 13A inside the handle 11A. The control unit 100A controls the feed motor 31 and motor 80 according to the state of the switch 13A pressed by the operation of the trigger 12A.

[0031] <Example of the main components of the rebar tying machine of this embodiment> • Example of a curl guide configuration Figure 2A is a side view showing an example of a curl guide, Figure 2B is a top view showing an example of a curl guide, Figure 2C is a bottom view showing an example of a curl guide, and Figure 2D is a front view showing an example of a curl guide. Figure 2E is a side view showing an example of a curl guide with some parts removed. Furthermore, Figure 2F is a front cross-sectional view showing an example of a curl guide, and Figure 2G is a perspective view of the main part showing an example of the parallel direction guide section of a curl guide. Figure 2H is a cross-sectional view showing an example of the delivery direction guide section of a curl guide. Here, Figure 2F is a cross-sectional view taken along line AA in Figure 2A, and Figure 2H is a cross-sectional view taken along line BB in Figure 2A. Next, an example of a curl guide 50a will be described with reference to each figure.

[0032] The curl guide 50a includes a first wire guide 51 that restricts the position of the wire W toward the radial outer side with respect to the radial direction of the annular feed path Ru shown by arrow D1 in Figures 2E and 2F, along the circumferential direction of the annular feed path Ru shown by arrow D2.

[0033] Furthermore, the curl guide 50a includes a second wire guide 52 that restricts the position of the wire W moving toward one side in the axial direction with respect to the axial direction of the annular feed path Ru, indicated by arrow D3 in Figures 2C, 2D, and 2F, along the circumferential direction of the annular feed path Ru, indicated by arrow D2.

[0034] Furthermore, the curl guide 50a includes a third wire guide 53 that restricts the position of the wire W toward the other side in the axial direction with respect to the axial direction of the annular feed path Ru indicated by arrow D3, along the circumferential direction of the annular feed path Ru indicated by arrow D2.

[0035] The first wire guide 51 includes a first guide surface 51a which is composed of a concave curved surface or the like that follows the annular feed path Ru.

[0036] The second wire guide 52 has a shape that includes a portion that contacts one side surface of the first wire guide 51 along the axial direction of the annular feed path Ru, and a portion that protrudes inward from the first guide surface 51a of the first wire guide 51 along the radial direction of the annular feed path Ru. The second wire guide 52 has a second guide surface 52a on the portion that protrudes inward from the first guide surface 51a of the first wire guide 51 along the radial direction of the annular feed path Ru.

[0037] The third wire guide 53 has a shape that includes a portion that contacts the other side surface of the first wire guide 51 along the axial direction of the annular feed path Ru, and a portion that protrudes inward from the first guide surface 51a of the first wire guide 51 along the radial direction of the annular feed path Ru. The third wire guide 53 has a third guide surface 53a on the portion that protrudes inward from the first guide surface 51a of the first wire guide 51 along the radial direction of the annular feed path Ru.

[0038] In the curl guide 50a, the first wire guide 51 is sandwiched between the second wire guide 52 and the third wire guide 53, and the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 face each other with a gap equal to the thickness of the first wire guide 51.

[0039] The curl guide 50a includes a parallel guide section 54 that guides two wires W through the annular feed path Ru indicated by arrow D1 in a radially aligned manner. The curl guide 50a also includes a parallel orientation guide section 55 that guides the two wires W passing through the parallel guide section 54 so that they are aligned radially along the annular feed path Ru.

[0040] The parallel-direction guide section 55 guides the two wires passing through the curl guide 50a so that they are aligned radially along the annular feed path Ru, with respect to the feed direction of the wire W, which is fed in the positive direction indicated by arrow F, on the downstream side of the magazine 2A. Therefore, the curl guide 50a has the parallel-direction guide section 55 on the upstream side and the parallel guide section 54 on the downstream side with respect to the feed direction of the wire W, which is fed in the positive direction indicated by arrow F. The parallel-direction guide section 55 is provided on the downstream side of the wire feed 3A, preferably on the downstream side of the wire locking body 70, with respect to the feed direction of the wire W, which is fed in the positive direction indicated by arrow F.

[0041] The parallel guide section 54 is formed by the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 facing each other on both sides along the axial direction of the annular feed path Ru, and a groove between the second guide surface 52a and the third guide surface 53a, where the outer circumference along the radial direction of the annular feed path Ru is closed by the first guide surface 51a of the first wire guide 51.

[0042] In the section where the parallel guide section 54 is provided, the curl guide 50a is configured such that the distance (width) Ra1 between the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 is longer than the diameter Rb of the wire W and shorter than twice the diameter Rb of the wire W. As a result, the curl guide 50a allows the two wires W fed by the wire feeding section 3A to pass through the annular feeding path Ru in an aligned state in the radial direction, due to the restriction Ra1 between the second guide surface 52a and the third guide surface 53a of the parallel guide section 54. Preferably, the distance Ra1 of the parallel guide section 54 is 1.5 times the diameter Rb of the wire W or less, such that the direction in which the two wires W are parallel with respect to the radial direction of the annular feeding path Ru is 45 degrees or less.

[0043] The parallel-direction guide section 55 is composed of the outer surface along the radial direction of the annular feed path Ru. In the portion of the curl guide 50a where the parallel-direction guide section 55 is provided, the distance Ra2 between the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 is configured to be longer than twice the length of the wire diameter Rb. As a result, the curl guide 50a allows two wires W passing through the parallel-direction guide section 55 to be parallel in a direction that intersects the radial direction of the annular feed path Ru.

[0044] The parallel-direction guide section 55 is oriented in the axial direction of the annular feed path Ru such that the upstream introduction section 55a aligns with the direction in which the two wires W fed by the wire feed section 3A are parallel, with respect to the feeding direction of the wire W which is fed in the positive direction indicated by arrow F. Furthermore, the downstream output section 55b of the parallel-direction guide section 55, which is connected to the parallel guide section 54, is inclined in a predetermined direction with respect to the radial direction of the annular feed path Ru, approaching the direction along the radial direction of the annular feed path Ru.

[0045] In this example, in the parallel-oriented guide section 55, at the lead-out section 55b, the second guide section 55b2, which contacts the other wire W, protrudes inward along the radial direction of the annular feed path Ru, relative to the first guide section 55b1, which contacts one wire W.

[0046] As a result, the parallel-oriented guide section 55 is composed of surfaces that are inclined to twist in a direction that gradually approaches the radial direction of the annular feed path Ru, from the introduction section 55a towards the output section 55b.

[0047] Therefore, the curl guide 50a guides one of the two wires W that are fed by the wire feeding section 3A and pass through the parallel-direction guide section 55, the one wire W that is in contact with the first guide section 55b1, and the other wire W that is in contact with the second guide section 55b2, so that it is directed toward the inner circumference along the radial direction of the annular feeding path Ru. The one wire W that is in contact with the first guide section 55b1 is in contact with the drive-side feed gear 30L, and the other wire W that is in contact with the second guide section 55b2 is in contact with the driven-side feed gear 30R.

[0048] The curl guide 50a then guides the two wires W, which were guided by the parallel-oriented guide section 55 so that they are aligned radially along the annular feed path Ru, through the parallel guide section 54, thereby maintaining them aligned radially along the annular feed path Ru.

[0049] The curl guide 50a includes a feed direction guide section 57 that guides the wire W to the guide guide 50b. The feed direction guide section 57 is provided on the tip side of the curl guide 50a with respect to the feed direction of the wire W being fed in the positive direction. The feed direction guide section 57 guides the wire W being fed out from the curl guide 50a in a first direction indicated by arrow C1 along the axial direction of the annular feed path Ru, as the wire W is fed in the positive direction by the wire feed section 3A. The first direction indicated by arrow C1 is the direction in which the magazine 2A and the reel 20 are offset.

[0050] The curl guide 50a has a fourth wire guide 58 attached to the tip side of the second wire guide 52. The fourth wire guide 58 may be configured to be detachable from the curl guide 50a.

[0051] The discharge direction guide section 57 includes a fourth guide surface 58a formed by the fourth wire guide 58 and a fifth guide surface 53b of the third wire guide 53. The fourth guide surface 58a of the discharge direction guide section 57 is connected to the second guide surface 52a of the second wire guide 52, and the fifth guide surface 53b is connected to the third guide surface 53a of the third wire guide 53.

[0052] Furthermore, the discharge direction guide section 57 includes a sixth guide surface 58b formed by the fourth wire guide 58. The sixth guide surface 58b of the discharge direction guide section 57 is connected to the first guide surface 51a of the first wire guide 51.

[0053] As a result, the delivery direction guide section 57 is composed of a groove in which a fourth guide surface 58a and a fifth guide surface 53b face each other with a predetermined distance between them on both sides along the axial direction of the annular feed path Ru, and the outer circumference side along the radial direction of the annular feed path Ru is closed by a sixth guide surface 58b between the fourth guide surface 58a and the fifth guide surface 53b.

[0054] The feed direction guide section 57 is configured by inclining a portion of the tip side of the curl guide 50a in the first direction (magazine offset direction) indicated by arrow C1. That is, the feed direction guide section 57 is inclined in the first direction indicated by arrow C1 with respect to the extension direction of the parallel guide section 54 along the circumferential direction of the annular feed path Ru, and connects to the parallel guide section 54. As a result, at the point where the parallel guide section 54 and the feed direction guide section 57 connect, the parallel guide section 54 bends in the first direction along the axial direction of the annular feed path Ru. The inclination angle of the feed direction guide section 57 in the first direction is preferably 3° or more and 7° or less. The inclination angle of the feed direction guide section 57 is the angle with respect to the extension direction of the parallel guide section 54, and the extension direction of the parallel guide section 54 is the direction along the circumferential direction of the annular feed path Ru defined by the curl guide 50a.

[0055] The discharge direction guide section 57 is configured such that the distance (width) between the fourth guide surface 58a and the fifth guide surface 53b is longer than the diameter Rb of the wire W and shorter than twice the diameter Rb of the wire W, similar to the parallel guide section 54.

[0056] • Example of the configuration of the cutting section Figure 3 is a perspective view showing an example of a cut section. Next, an example of the cut section 6A will be described with reference to each figure.

[0057] The fixed blade section 60 is provided downstream of the wire guide 4A with respect to the feeding direction of the wire W being fed in the forward direction. The fixed blade section 60 is composed of a cylindrical member that serves as the axis of rotation of the movable blade section 61 and has an opening 60a that penetrates through the cylindrical shape in the radial direction. The opening 60a is an elongated hole shaped in line with the direction in which the two wires W fed by the wire feeding section 3A are parallel.

[0058] The movable blade portion 61 is rotatably supported on the fixed blade portion 60 as an axis, and includes a blade portion 61a that slides against the opening end of the opening 60a of the fixed blade portion 60 during rotational movement on the fixed blade portion 60 as an axis.

[0059] The fixed blade section 60 is provided with a first abutment blade section 60b and a second abutment blade section 60c at the opening end of the opening 60a into which the blade section 61a of the movable blade section 61 slides. The fixed blade section 60 is provided with the first abutment blade section 60b and the second abutment blade section 60c along the direction in which the two wires W are parallel.

[0060] The fixed blade section 60 has a first abutment blade section 60b on the front side and a second abutment blade section 60c on the back side, relative to the direction of movement of the blade section 61a indicated by arrow E1, caused by the rotational movement of the movable blade section 61 around the fixed blade section 60 as an axis. The fixed blade section 60 includes a retractable recess 60d that connects the opening 60a to the second abutment blade section 60c. The retractable recess 60d is formed on the inner circumferential surface of the opening 60a with a shape that allows a single wire W to enter, and is configured to have a concave portion that recesses from the opening 60a toward the second abutment blade section 60c. The amount by which the second abutment blade section 60c is retracted relative to the first abutment blade section 60b is preferably about half the diameter of the wire W.

[0061] In the cutting section 6A, the rotational movement of the movable blade section 61 around the fixed blade section 60 causes the blade section 61a of the movable blade section 61 to slide against the opening end of the opening 60a of the fixed blade section 60. With two wires W passed through the opening 60a of the cutting section 6A, when the blade section 61a moves from the standby position in the direction of arrow E1, one of the two parallel wires W is pressed against the first abutment blade section 60b by the blade section 61a, and is cut by the shearing force applied. The other of the two parallel wires W is pushed by the blade section 61a and bends, enters the retractable recess 60d, and is then pressed against the second abutment blade section 60c by the blade section 61a, and is cut by the shearing force applied.

[0062] • Example of the binding section configuration Figures 4A and 4B are cross-sectional plan views showing examples of the binding section and the drive section. Next, the configuration of the binding section 7A and the drive section 8A will be described with reference to each figure.

[0063] The binding section 7A includes a rotating shaft 72 that operates the wire locking body 70 and the sleeve 71. The rotating shaft 72 is connected to the reduction gear 81 via a connecting section 72b, which is configured to rotate integrally with the reduction gear 81 and to be movable axially relative to the reduction gear 81. The connecting section 72b includes a spring 72c that biases the rotating shaft 72 backward, in the direction toward the reduction gear 81, and restricts the position of the rotating shaft 72 along the axial direction. As a result, the rotating shaft 72 is configured to be able to move forward, away from the reduction gear 81, while being pushed backward by the spring 72c. Therefore, when a force is applied that moves the wire locking body 70 forward along the axial direction, the rotating shaft 72 can move forward while being pushed backward by the spring 72c.

[0064] The wire locking body 70 includes a center hook 70C connected to the rotating shaft 72, and a first side hook 70R and a second side hook 70L that open and close relative to the center hook 70C.

[0065] The center hook 70C is connected to the tip of the rotating shaft 72, which is one end of the rotating shaft 72 along its axial direction, via a configuration that allows it to rotate relative to the rotating shaft 72 and move integrally with the rotating shaft 72 in the axial direction.

[0066] The wire locking body 70 rotates with the axis 71b as the pivot point, causing the tip of the first side hook 70R to open and close in a direction away from the center hook 70C. Similarly, the tip of the second side hook 70L opens and closes in a direction away from the center hook 70C.

[0067] The sleeve 71 has a projection (not shown) that protrudes from the inner circumferential surface of the space into which the rotating shaft 72 is inserted. This projection fits into a groove of a feed screw 72a formed axially on the outer circumference of the rotating shaft 72. The sleeve 71 is supported by a support member 76d so as to be rotatable and slidable in the axial direction. When the rotating shaft 72 rotates, the sleeve 71 moves in a direction along the axial direction of the rotating shaft 72 in accordance with the rotation direction of the rotating shaft 72, due to the action of the projection (not shown) and the feed screw 72a of the rotating shaft 72. The sleeve 71 also rotates integrally with the rotating shaft 72.

[0068] The sleeve 71 is equipped with an opening / closing pin 71a for opening and closing the first side hook 70R and the second side hook 70L.

[0069] The opening / closing pin 71a is inserted into the opening / closing guide hole 73 provided in the first side hook 70R and the second side hook 70L. The opening / closing guide hole 73 extends along the direction of movement of the sleeve 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the sleeve 71, into an opening / closing operation by rotation of the first side hook 70R and the second side hook 70L with the axis 71b as the pivot point.

[0070] As the sleeve 71 moves downward as indicated by arrow A2, the wire locking body 70 causes the first side hook 70R and the second side hook 70L to move away from the center hook 70C in a rotational motion with the axis 71b as the pivot point, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73.

[0071] As a result, the first side hook 70R and the second side hook 70L open relative to the center hook 70C, forming a feeding path for the wire W between the first side hook 70R and the center hook 70C, and between the second side hook 70L and the center hook 70C.

[0072] When the first side hook 70R and the second side hook 70L are open relative to the center hook 70C, the wire W fed by the wire feeding section 3A passes between the center hook 70C and the first side hook 70R. The wire W passing between the center hook 70C and the first side hook 70R is guided to the curl forming section 5A. Then, the wire W, which has been given a curl by the curl guide 50a and guided to the binding section 7A by the guidance guide 50b, passes between the center hook 70C and the second side hook 70L.

[0073] As the wire locking body 70 moves upward in the direction indicated by arrow A1, the first side hook 70R and the second side hook 70L move toward the center hook 70C in a rotational motion with the axis 71b as the pivot point, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73. As a result, the first side hook 70R and the second side hook 70L close toward the center hook 70C.

[0074] When the first side hook 70R closes against the center hook 70C, the wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a manner that allows it to move between the first side hook 70R and the center hook 70C. Also, when the second side hook 70L closes against the center hook 70C, the wire W sandwiched between the second side hook 70L and the center hook 70C is locked in a manner that prevents it from coming out from between the second side hook 70L and the center hook 70C.

[0075] The sleeve 71 includes a bending portion 71c1 that shapes the wire W into a predetermined shape by pushing and bending one end of the wire W in a predetermined direction, and a bending portion 71c2 that shapes the wire W into a predetermined shape by pushing and bending the other end of the wire W, which has been cut at the cutting portion 6A, in a predetermined direction.

[0076] As the sleeve 71 moves upward as indicated by arrow A1, it presses the tip end of the wire W, which is locked by the center hook 70C and the second side hook 70L, with the bending portion 71c1, bending it toward the reinforcing bar S. Also, as the sleeve 71 moves upward as indicated by arrow A1, it presses the end end of the wire W, which is locked by the center hook 70C and the first side hook 70R and cut at the cutting portion 6A, with the bending portion 71c2, bending it toward the reinforcing bar S.

[0077] The binding section 7A includes a rotation restricting section 74 that restricts the rotation of the wire locking body 70 and sleeve 71 in conjunction with the rotational movement of the rotating shaft 72. Depending on the position of the sleeve 71 along the axial direction of the rotating shaft 72, the rotation restricting section 74 restricts the rotation of the sleeve 71 in conjunction with the rotation of the rotating shaft 72, causing the sleeve 71 to move in the directions of arrows A1 and A2 as the rotating shaft 72 rotates.

[0078] As a result, the sleeve 71 moves in the direction of arrow A1 without rotating, causing the first side hook 70R and the second side hook 70L to close relative to the center hook 70C, and the wire W is locked in place. Conversely, when the sleeve 71 moves in the direction of arrow A2 without rotating, the first side hook 70R and the second side hook 70L open relative to the center hook 70C, and the wire W is released from being locked.

[0079] When the restriction on the rotation of the sleeve 71 by the rotation restricting part 74 is released, the binding part 7A allows the sleeve 71 to rotate in conjunction with the rotation of the rotating shaft 72.

[0080] As a result, the first side hook 70R, the second side hook 70L, and the center hook 70C, which are holding the wire W, rotate, and the held wire W is twisted.

[0081] <Example of operation of the rebar tying machine according to the first embodiment> Figures 5A, 5B, 5C, and 5D are perspective views showing an example of the operation of cutting the wire at the cutting section. Next, referring to each figure, the operation of cutting the wire W at the cutting section 6A during the process of tying the reinforcing bars S with wire W will be explained.

[0082] As shown in Figure 5A, in the cutting section 6A, with the blade portion 61a of the movable blade portion 61 moved to the standby position, two wires W fed by the wire feeding section 3A are passed through the opening 60a of the fixed blade portion 60. The orientation of the two wires W passing through the opening 60a is parallel to the axial direction that intersects the radial direction of the annular feeding path Ru shown in Figure 1A, etc.

[0083] In the cutting section 6A, with two wires W passed through the opening 60a of the fixed blade section 60, the blade section 61a of the movable blade section 61 moves from its standby position in the direction of arrow E1 due to the rotational movement of the movable blade section 61 around the fixed blade section 60 as an axis. The rotational movement of the movable blade section 61 is linked to the operation of the binding section 7A, which will be described later.

[0084] When the blade portion 61a of the movable blade portion 61 moves from its standby position in the direction of arrow E1, one of the two parallel wires W, wire W1, is pressed against the first abutment blade portion 60b of the fixed blade portion 60 by the blade portion 61a. The other wire W2 is pushed by the blade portion 61a and bends along the direction of movement of the blade portion 61a, entering the retractable recess 60d of the fixed blade portion 60. As a result, a shearing force is applied to one of the wires W1, and the cutting of one wire W1 begins before that of the other wire W2.

[0085] The rotational movement of the movable blade 61 around the fixed blade 60 causes the blade 61a to move in the direction of arrow E1, initiating the cutting of one wire W1. Once this wire W1 is cut to a predetermined position, the other wire W2 is pressed against the second abutment blade 60c by the blade 61a. This initiates the cutting of the other wire W2.

[0086] As the movable blade 61 rotates around the fixed blade 60, the blade 61a moves further in the direction of arrow E1, completing the cutting of the first wire W1, which was started earlier. Then, as the blade 61a moves further in the direction of arrow E1 and reaches the cutting completion position as shown in Figure 5B, the cutting of the other wire W2, which was started later, is completed.

[0087] When the cutting of the wire W is complete, the rotational movement of the movable blade 61 around the fixed blade 60 causes the blade 61a to move in the direction of arrow E2 and return to the standby position as shown in Figure 5C. The two wires W cut by the above-described operation of the cutting unit 6A have the tip of the other wire W2 bent in the direction of movement of the blade 61a relative to the tip of the other wire W1. As shown in Figure 5D, the direction in which the tip of the other wire W2 bends is the direction that faces the inner circumference of the annular feed path Ru when the wire W is fed in the forward direction and the tip of the wire W reaches the curl guide 50a. One wire W1 is fed in contact with the drive-side feed gear 30L, and the other wire W2 is fed in contact with the driven-side feed gear 30R.

[0088] Figures 6A, 6B, 6C, 6D, 6E, 6F, 6G, and 6H are side cross-sectional views of the main parts showing an example of the operation of the rebar tying machine of the first embodiment. Figure 6A shows the state in which the rebar S is placed in a position where it can be tied. Figure 6B shows the operation of feeding the wire W in the forward direction and wrapping it around the rebar S. Figure 6C shows the operation of locking the wire W that is wrapped around the rebar S. Figure 6D shows the operation of feeding the wire W in the reverse direction and wrapping it around the rebar S. Figure 6E shows the operation of cutting the excess portion of the wire W that is wrapped around the rebar S. Figure 6F shows the operation of bending the wire W that is wrapped around the rebar S. Figures 6G and 6H show the operation of twisting the wire W that is wrapped around the rebar S.

[0089] Next, with reference to the figures, the operation of tying the reinforcing bars S with wire W using the reinforcing bar tying machine 1A of the first embodiment will be described.

[0090] In the rebar tying machine 1A, two wires W are held between a pair of feed gears 30 (30L, 30R), and the standby state is when the tip of each wire W is positioned between the gripping position of the feed gears 30 (30L, 30R) and the fixed blade portion 60 of the cutting section 6A. Also, in the standby state, the rebar tying machine 1A has a sleeve 71 and a wire locking body 70 to which a first side hook 70R, a second side hook 70L, and a center hook 70C are attached, which moves in the rearward direction indicated by arrow A2, as shown in Figure 4A, with the first side hook 70R open relative to the center hook 70C and the second side hook 70L open relative to the center hook 70C.

[0091] As shown in Figure 6A, when the reinforcing bar S is placed between the curl guide 50a and the guide guide 50b of the curl forming section 5A and the trigger 12A is operated, the feed motor 31 is driven in the forward rotation direction, and as shown in Figure 6B, the two wires W are fed in the forward direction indicated by the arrow F in the wire feeding section 3A.

[0092] The two wires W fed in the forward direction by the wire feeding section 3A are aligned parallel to the axial direction of the annular feeding path Ru upstream of the curl guide 50a by the wire guide 4A.

[0093] The two wires W, fed in the forward direction, pass between the center hook 70C and the first side hook 70R and are fed to the curl guide 50a of the curl forming section 5A. As the two wires W pass through the curl guide 50a, they acquire a curl that causes them to wrap around the reinforcing bar S along the annular feeding path Ru. Furthermore, as the two wires W pass through the curl guide 50a, they are guided to align radially with the annular feeding path Ru. In addition, the two wires W pass through the curl guide 50a while aligned radially with the annular feeding path Ru.

[0094] Figure 7A is a side view showing an example of the operation of guiding wires in parallel orientation within a curl guide, Figure 7B is an enlarged side view of a key part showing an example of the operation of guiding wires in parallel orientation within a curl guide, and Figure 7C is an enlarged perspective view of a key part showing an example of the operation of guiding wires in parallel orientation within a curl guide.

[0095] In the cutting operation of the two wires W by the cutting section 6A described above, when the tip of the two cut wires W reaches the curl guide 50a, the tip of the other wire W2, which is fed in contact with the driven feed gear 30R, is bent in a direction that faces the inner circumference of the annular feed path Ru, while the tip of the other wire W2, which is fed in contact with the driven feed gear 30R, is bent in a direction that faces the inner circumference of the annular feed path Ru, compared to the tip of the other wire W1, which is fed in contact with the drive feed gear 30L.

[0096] In the next binding operation, when the two wires W are fed in the forward direction by the wire feeding unit 3A, the ends of the two wires W that were cut in the previous binding operation pass through the parallel-direction guide section 55 of the curl guide 50a. Of the two wires W fed by the wire feeding unit 3A and passing through the parallel-direction guide section 55, one wire W1 comes into contact with the first guide section 55b1 of the parallel-direction guide section 55. In contrast, the other wire W2 comes into contact with the second guide section 55b2 of the parallel-direction guide section 55.

[0097] The parallel-oriented guide section 55 is inclined from the introduction section 55a toward the output section 55b, with the second guide section 55b2, to which the other wire W2 contacts, in a direction that protrudes toward the inner circumference along the radial direction of the annular feed path Ru, relative to the first guide section 55b1 to which one wire W1 contacts.

[0098] As a result, of the two wires W that are fed in the forward direction by the wire feeding section 3A and pass through the parallel-direction guide section 55, one wire W1 that is in contact with the first guide section 55b1 is guided so that the other wire W2 that is in contact with the second guide section 55b2 is guided toward the inner circumference along the radial direction of the annular feeding path Ru.

[0099] Two wires W, which are fed in the forward direction by the wire feeding section 3A and guided by the parallel-direction guide section 55 so that they are aligned radially along the annular feeding path Ru, enter the parallel guide section 54 from the exit section 55b of the parallel-direction guide section 55.

[0100] The parallel guide section 54 is configured such that the distance Ra1 between the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 is longer than the diameter Rb of the wire W and shorter than twice the diameter Rb of the wire W.

[0101] As a result, the two wires W that are fed in the forward direction by the wire feeding section 3A and enter the parallel guide section 54 from the exit section 55b of the parallel-oriented guide section 55, pass through the parallel guide section 54 while maintaining their alignment in the radial direction of the annular feeding path Ru, as shown in Figure 6B, due to the restriction Ra1 between the second guide surface 52a and the third guide surface 53a of the parallel guide section 54.

[0102] Figure 7D is a cross-sectional view of a key part showing an example of the operation of guiding the wire in the feed direction guide section. The two wires W, which are fed in the forward direction in the wire feeding section 3A and pass from the parallel guide section 54 through the feed direction guide section 57, are kept aligned radially along the annular feeding path Ru, as shown in Figure 6C.

[0103] Furthermore, the two wires W passing from the parallel guide section 54 through the feed direction guide section 57 are fed diagonally in the first direction indicated by arrow C1 from the exit section 57a ​​of the feed direction guide section 57, which is the exit section of the curl guide 50a. The first direction is the direction in which the feed direction guide section 57 bends relative to the parallel guide section 54 along the axial direction of the annular feed path Ru, and is the direction in which the reel 20 is offset. The two wires W passing from the parallel guide section 54 through the feed direction guide section 57 may be designed to have a tendency to bend in the first direction. For example, as shown in Figure 7D, the two wires W passing from the parallel guide section 54 through the feed direction guide section 57 are fed while in contact with the second guide surface 52a located outside the first direction in which the feed direction guide section 57 bends relative to the parallel guide section 54, and with the end surface 58c on the fourth guide surface 58a side of the exit section 57a. Furthermore, the two wires W passing from the parallel guide section 54 through the delivery direction guide section 57 are fed while in contact with the bent portion 58d of the third guide surface 53a and the fifth guide surface 53b, which are located on the inside of the first direction in which the delivery direction guide section 57 bends relative to the parallel guide section 54. As a result, the two wires W passing from the parallel guide section 54 through the delivery direction guide section 57 are given a tendency to bend in the first direction and are fed out diagonally toward the first direction.

[0104] The tip of the wire W, which is pulled out from the reel 20 and fed in the forward direction by the wire feeding section 3A, points in the second direction indicated by arrow C2, which is the opposite direction to the first direction in which the reel 20 is offset. In contrast, the wire W passing through the feed direction guide section 57 from the parallel guide section 54 is fed in the first direction, so the amount by which the tip points in the second direction is suppressed compared to the case where the feed direction guide section 57 is not provided.

[0105] The two wires W are coiled in the curl guide 50a and arranged in parallel in a radial direction along the annular feed path Ru. Furthermore, the two wires W that are fed out from the exit portion 57a ​​of the curl guide 50a in the first direction are guided by the guide guide 50b and then fed in the forward direction by the wire feed section 3A, so that they are guided by the guide guide 50b between the center hook 70C and the second side hook 70L. The two wires W are then fed until their ends abut against the feed restricting section 90. When the ends of the wires W reach the position where they abut against the feed restricting section 90, the drive of the feed motor 31 is stopped.

[0106] After stopping the forward feeding of the wire W, the motor 80 is driven in the forward rotation direction. In the operating range where the wire W is locked by the wire locking body 70, the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72, is restricted by the rotation restricting unit 74. As a result, as shown in Figure 6C, the rotation of the motor 80 is converted into linear motion, and the sleeve 71 moves in the forward direction, as indicated by arrow A1.

[0107] As the sleeve 71 moves forward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70R moves toward the center hook 70C in a rotational motion with the axis 71b as the pivot point. When the first side hook 70R closes toward the center hook 70C, the wire W sandwiched between the first side hook 70R and the center hook 70C is locked in a manner that allows it to move between the first side hook 70R and the center hook 70C.

[0108] Furthermore, the second side hook 70L moves toward the center hook 70C by a rotational motion with the axis 71b as the pivot point. When the second side hook 70L closes toward the center hook 70C, the wire W, which is sandwiched between the second side hook 70L and the center hook 70C, is locked in a manner that prevents it from coming out from between the second side hook 70L and the center hook 70C.

[0109] After the sleeve 71 is advanced to a position where the wire W is locked by the closing of the first side hook 70R and the second side hook 70L, the rotation of the motor 80 is temporarily stopped and the feed motor 31 is driven in the reverse direction.

[0110] As a result, the pair of feed gears 30 (30L, 30R) reverse direction, and as shown in Figure 6D, the two wires W sandwiched between the pair of feed gears 30 (30L, 30R) are fed in the opposite direction indicated by arrow R. Since the ends of the two wires W are locked in a manner that prevents them from coming out from between the second side hook 70L and the center hook 70C, the wires W are wrapped around the reinforcing bar S by the motion of feeding the wires W in the reverse direction.

[0111] After wrapping the wire W around the reinforcing bar S and stopping the reverse rotation of the feed motor 31, the motor 80 is driven in the forward rotation direction to move the sleeve 71 further forward as indicated by arrow A1. As shown in Figure 6E, the forward movement of the sleeve 71 is transmitted to the cutting section 6A by the transmission mechanism 62, causing the movable blade section 61 to rotate, and the wire W, which is locked by the first side hook 70R and the center hook 70C, is cut by the operation of the fixed blade section 60 and the movable blade section 61.

[0112] By driving the motor 80 in the forward rotation direction, the sleeve 71 moves forward in the direction indicated by arrow A1, cutting the two wires W. Almost simultaneously, the bending sections 71c1 and 71c2 move in a direction toward the reinforcing bar S. As a result, the ends of the two wires W, which are locked by the center hook 70C and the first side hook 70R, are pressed toward the reinforcing bar S by the bending section 71c1, bending them toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W, which is locked between the second side hook 70L and the center hook 70C, is held in place by the bending section 71c1.

[0113] Furthermore, the end of the wire W, which is locked by the center hook 70C and the first side hook 70R and cut at the cutting section 6A, is pressed toward the reinforcing bar S by the bending section 71c2, bending it toward the reinforcing bar S with the locking position as a fulcrum. As the sleeve 71 moves further forward, the wire W, which is locked between the first side hook 70R and the center hook, is held in a state where it is sandwiched by the bending section 71c2. In the operating range where the wire W is bent and shaped, the rotation restricting section 74 restricts the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72, and the sleeve 71 moves forward without rotating.

[0114] After bending the tip and end ends of the two wires W toward the reinforcing bar S, the motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to move further forward. When the sleeve 71 moves to a predetermined position, the rotation restriction on the sleeve 71 by the rotation restricting unit 74 is released.

[0115] As a result, the motor 80 is driven further in the forward rotation direction, causing the sleeve 71 to rotate in conjunction with the rotating shaft 72, and as shown in Figure 6F, the two wires W locked by the wire locking body 70 begin to twist.

[0116] In the operating range where the sleeve 71 rotates and twists the wire W, the wire W, which is locked by the wire locking body 70, is twisted, and a force is applied to the wire locking body 70 that pulls it forward along the axial direction of the rotating shaft 72. On the other hand, the rotating shaft 72 is subjected to a force that pushes it backward by the spring 72c. As a result, the wire locking body 70 moves forward while being subjected to the force that pushes the rotating shaft 72 backward by the spring 72c, and twists the wire W as it moves forward, as shown in Figure 6G.

[0117] In the operating range where the sleeve 71 rotates and twists the wire W, the wire locking body 70 rotates further in conjunction with the rotating shaft 72, causing the wire locking body 70 and the rotating shaft 72 to move forward, which is the direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, thereby twisting the wire W further.

[0118] Therefore, as shown in Figure 6H, the two twisted wires W have a smaller gap between the twisted portion of the wires W and the reinforcing bar S, and they adhere closely to the reinforcing bar S in a manner that follows the shape of the reinforcing bar S.

[0119] When the load on the motor 80 is detected to be at its maximum due to the twisting of the two wires W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse direction, the rotating shaft 72 rotates in the reverse direction, and as the sleeve 71 rotates in the reverse direction following the rotation of the rotating shaft 72, the rotation restricting unit 74 restricts the rotation of the sleeve 71, which is linked to the rotation of the rotating shaft 72. As a result, the sleeve 71 moves in the direction of arrow A2, which is the rear direction.

[0120] As the sleeve 71 moves backward, the bent portions 71c1 and 71c2 separate from the wire W, and the holding of the wire W by the bent portions 71c1 and 71c2 is released. Also, as the sleeve 71 moves backward, the opening / closing pin 71a passes through the opening / closing guide hole 73. As a result, the first side hook 70R moves away from the center hook 70C in a rotational motion with the shaft 71b as the pivot point. Similarly, the second side hook 70L moves away from the center hook 70C in a rotational motion with the shaft 71b as the pivot point. As a result, the two wires W that tie the reinforcing bars S together are released from the wire locking body 70.

[0121] <Examples of the operation and effects of the rebar tying machine of the first embodiment> Figure 8A is a front cross-sectional view of a curl guide showing an example of the operation and effect of the rebar tying machine of this embodiment, and Figure 8B is a front cross-sectional view of a curl guide showing an example of the problems of conventional rebar tying machines.

[0122] The rebar tying machine 1A is positioned with the reel 20 offset in the first direction indicated by arrow C1. The wire W, which is fed from the reel 20 offset in this first direction by the wire feeding unit 3A and coiled by the curl guide 50a, moves in the second direction indicated by arrow C2, which is the opposite direction to the first direction in which the reel 20 is offset.

[0123] In a rebar tying machine with this configuration, as shown in Figure 8B, in a conventional rebar tying machine that ties rebars S with two wires W, the distance Ra3 (referred to as the inner width of the curl guide) between the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 in the curl guide 50a is set to be longer than twice the length of the diameter Rb of the wire W. With this configuration, the two wires W can be fed in a direction aligned along the axis of the annular feeding path Ru indicated by arrow D3.

[0124] However, in a configuration where the inner width of the curl guide is longer than twice the diameter Rb of the wire W, each wire W can move in the axial direction (referred to as the left-right direction) of the annular feed path Ru for a length longer than the diameter Rb of the wire W. If the amount of left-right movement of the wire W within the curl guide 50a is large, the position of the tip of the wire W that has been coiled in the curl guide 50a by the operation of feeding the wire W in the forward direction will shift by a large amount in the left-right direction, and there is a possibility that it will not enter the guide guide 50b. In addition, there is a possibility that the left and right sides of one wire W and the other wire W may be swapped within the curl guide 50a, and there is a possibility that the two wires W may twist within the curl guide 50a.

[0125] In contrast, in the rebar tying machine 1A of this embodiment, which ties rebars S with two wires W, the distance Ra1 between the second guide surface 52a of the second wire guide 52 and the third guide surface 53a of the third wire guide 53 in the curl guide 50a is configured to be longer than the diameter Rb of the wire W and shorter than twice the diameter Rb of the wire W. With this configuration, the two wires W can be fed in a direction aligned radially along the annular feeding path Ru indicated by arrow D1.

[0126] As a result, the amount of lateral movement of the wire W within the curl guide 50a is reduced, and the amount of lateral displacement of the tip of the wire W, which has been given a curl in the curl guide 50a by the movement of feeding the wire W in the forward direction, is reduced, preventing it from failing to enter the guide 50b. In addition, there is no possibility of the left and right sides of one wire W and the other wire W being swapped within the curl guide 50a, thus preventing the two wires W from twisting within the curl guide 50a.

[0127] Furthermore, the two wires W fed in the forward direction by the wire feeding section 3A are fed out from the feed direction guide section 57 of the curl guide 50a in the first direction indicated by arrow C1, as shown in Figure 1D. As a result, the reel 20 is offset in the first direction, so that the displacement amount WL of the wire W moving in the second direction indicated by arrow C2, relative to the parallel guide section 54, can be reduced compared to the case where the wire W is not fed in the first direction. Therefore, the amount by which the tip of the wire W, which has been coiled in the curl guide 50a by the operation of feeding the wire W in the forward direction, shifts in the second direction relative to the parallel guide section 54 is reduced, and the problem of it not entering the guide guide 50b is suppressed.

[0128] If the inclination angle of the parallel guide section 54 of the delivery direction guide section 57 with respect to the stretching direction is less than 3°, the effect of reducing the displacement amount WL is small, and the position of the tip of the wire W that has been coiled by the curl guide 50a shifts in the second direction, making it difficult to enter the guide guide 50b. On the other hand, if the inclination angle of the parallel guide section 54 of the delivery direction guide section 57 with respect to the stretching direction exceeds 7°, the position of the tip of the wire W that has been coiled by the curl guide 50a shifts in the first direction, making it difficult to enter the guide guide 50b. Therefore, it is preferable that the inclination angle of the parallel guide section 54 of the delivery direction guide section 57 with respect to the stretching direction is 3° or more and 7° or less.

[0129] In the curl guide 50a, the outer portion of the wire guide 57 in the direction of bending is prone to wear due to contact with the wire W. Therefore, if the fourth wire guide 58, located on the outer side of the wire guide 57 in the direction of bending, is configured to be detachable from the curl guide 50a, the fourth wire guide 58 can be replaced.

[0130] <Example of the configuration of the rebar tying machine according to the second embodiment> Figure 9 is a front view showing an example of the main components of the rebar tying machine according to the second embodiment. The overall configuration of the rebar tying machine according to the second embodiment is equivalent to that of the rebar tying machine 1A according to the first embodiment.

[0131] The rebar tying machine 1B of the second embodiment is equipped with a curl guide 50a2 at the outlet 57a from which the wire W is fed out, which is inclined toward the first direction indicated by arrow C1.

[0132] The curl guide 50a2 is the mounting part for the main body 10A, and is mounted with the entire structure tilted in a predetermined direction.

[0133] The curl guide 50a2 is attached to the main body 10A with the entire structure tilted so that the outlet portion 57a ​​faces in the direction that the magazine 2A and the reel 20 housed in the magazine 2A are offset.

[0134] As a result, the wire W, which is fed by the wire feeding section 3A and passes through the curl guide 50a2, is discharged from the outlet section 57a ​​in the direction in which the magazine 2A is offset. Thus, the inclination of the curl guide 50a2 in a predetermined direction constitutes a discharge direction guide section.

[0135] <Example of the configuration of the rebar tying machine according to the third embodiment> Figure 10A is a side view showing another example of a curl guide, Figure 10B is a top view showing another example of a curl guide, Figure 10C is a bottom view showing another example of a curl guide, and Figure 10D is a front view showing another example of a curl guide, illustrating the main components of a rebar tying machine according to a third embodiment.

[0136] In the rebar tying machine of the third embodiment, the curl guide 50a3 includes a wire delivery direction guide section 57 inclined toward the first direction indicated by arrow C1, at the outlet section 57a ​​from which the wire W is delivered.

[0137] The wire delivery direction guide section 57 is configured to incline a portion of the curl guide 50a3 in the first direction indicated by arrow C1. The wire delivery direction guide section 57 is inclined starting from the bent section 50a4 on the side opposite to the outlet section 57a, which is closer to the main body section 10A shown in Figure 1A, etc., in the direction in which the outlet section 57a ​​faces the direction in which the magazine 2A and the reel 20 housed in the magazine 2A are offset. The direction in which the wire delivery direction guide section 57 is bent at the bent section 50a4 is different from the circumferential direction of the annular wire path Ru and the direction perpendicular to the circumferential direction.

[0138] As a result, the wire W, which is fed by the wire feeding section 3A and passes through the curl guide 50a3, is fed out from the outlet section 57a ​​in the direction in which the magazine 2A is offset by the feed direction guide section 57. Thus, the feed direction guide section is formed by the inclination of the curl guide 50a3 in a predetermined direction.

[0139] <Example of the configuration of the rebar tying machine according to the fourth embodiment> Figure 11A is a side view showing another example of a curl guide, Figure 11B is a top view showing another example of a curl guide, and Figure 13C is a front view showing another example of a curl guide, illustrating the main components of a rebar tying machine according to a third embodiment.

[0140] In the third embodiment of the rebar tying machine, the curl guide 50a5 includes a wire delivery direction guide section 57 inclined toward the first direction indicated by arrow C1, at the outlet section 57a ​​from which the wire W is delivered.

[0141] The wire delivery direction guide section 57 is configured to incline a part of the curl guide 50a3 in the first direction indicated by arrow C1. The wire delivery direction guide section 57 is inclined starting from a bent section 50a6 located near the midpoint between the outlet section 57a ​​and the main body section 10A shown in Figure 1A, etc., on the opposite side of the outlet section 57a, so that the outlet section 57a ​​faces the direction in which the magazine 2A and the reel 20 housed in the magazine 2A are offset. The direction in which the wire delivery direction guide section 57 is bent at the bent section 50a6 is perpendicular to the circumferential direction of the annular wire path Ru.

[0142] As a result, the wire W, which is fed by the wire feeding section 3A and passes through the curl guide 50a5, is discharged from the outlet section 57a ​​in the direction in which the magazine 2A is offset. Thus, the inclination of the curl guide 50a5 in a predetermined direction constitutes a discharge direction guide section.

[0143] Even with a configuration where the reinforcing bars S are tied together with a single wire W, the offset of the magazine 2A (reel 20) creates the problem that the wire W will move in the second direction indicated by arrow C2. By providing a wire delivery direction guide unit 57, the displacement amount WL of the wire W moving in the second direction, relative to the parallel guide unit 54, can be reduced compared to the case where the wire W is not delivered in the first direction. Thus, although the above embodiment was described as an example where the reinforcing bars S are tied together with multiple wires W, a configuration in which the reinforcing bars S are tied together with a single wire W is also possible, and the number of wires W is not a mandatory configuration. [Explanation of Symbols]

[0144] 1A, 1B... Rebar tying machine, 10A... Main body, 2A... Magazine, 20... Reel, 3A, 3B... Wire feeding section, 30 (30L, 30R)... Feed gear, 31... Feed motor, 32L, 32R... Groove section, 33... Gear section, 5A... Curl forming section, 50a, 50a2, 50a3, 50a5... Curl guide, 50b... Guiding guide, 51... No. 1 wire guide, 51a...first guide surface, 52...second wire guide, 52a...second guide surface, 53...third wire guide, 53a...third guide surface, 53b...fifth guide surface, 54...parallel guide section, 55...parallel direction guidance section, 55a...introduction section, 55b...exit section, 55b1...first guidance section, 55b2...second guidance section, 57...Feeding direction guide section, 57a...Outlet section, 58...Fourth wire guide, 58a...Fourth guide surface, 58b...Sixth guide surface, 58c...End face, 58d...Bending section, 6A...Cutting section, 60...Fixed blade section, 60a...Opening, 60b...First abutment blade section, 60c...Second abutment blade section, 60d...Retracted recess, 61...Movable blade section, 61 a...Blade section, 7A...Binding section, 70...Wire locking body, 70R...First side hook, 70L...Second side hook, 70C...Center hook, 71...Sleeve, 72...Rotating shaft, 72a...Feed screw, 72b...Connecting section, 72c...Spring, 74...Rotation restricting section, 8A...Drive section, 80...Motor, 81...Gear reducer, W...Wire

Claims

1. A housing section for housing the wire, A wire feeding unit for feeding the wire housed in the aforementioned housing section, A curl-forming section that forms an annular feeding path for winding the wire fed by the wire feeding section around the bundled object, It is equipped with a binding section that twists the wire wrapped around the object being bound, The curl-forming portion is, A curl guide that gives a curl to the wire being fed by the wire feeding section, The system includes a guide that guides the wire, which has been coiled by the curl guide, to the binding portion. The housing section is positioned offset in one direction with respect to the curl guide, The curl guide feeds the wire in the direction of the first direction. Binding machine.

2. The aforementioned curl guide is equipped with a wire exit portion that is inclined in the direction toward the first direction. The binding machine according to claim 1.

3. The inclination angle of the aforementioned delivery direction guide unit with respect to the direction along the circumferential direction of the annular feed path is 3° or more and 7° or less. The binding machine according to claim 2.

4. The curl guide is tilted so that the wire exit portion is directed in the direction of the first direction. The binding machine according to claim 1.

5. The curl guide allows multiple wires to pass through in a manner aligned radially along the annular feeding path. A binding machine according to any one of claims 1 to 4.

Images