End machine

Abstract

To provide a binding machine capable of applying an appropriate load on a wire when the wire is pulled back.SOLUTION: A steel bar binding machine 1A comprises: a wire feeding unit 3A that feeds a wire W; a curl forming unit 5A that constitutes a path for winding the wire W fed by the wire feeding unit 3A around a steel bar S; and a binding unit 7A that twists the wire wound on the steel bar S. The wire feeding unit 3A is provided with a pair of feed gears 30a and 30b that hold the wire W between and rotate to feed the wire. A contact amount between one feed gear 30a and the wire W is switched in accordance with the feeding direction of the wire W, and a contact amount between the feed gear 30a and the wire W in an operation of feeding the wire W in a reverse direction and winding it on the steel bar S is set larger than that between the feed gear 30a and the wire W in an operation of feeding the wire W in a forward direction and winding it on the steel bar S.SELECTED DRAWING: Figure 1A

Description

Technical Field

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

Background Art

[0002] Reinforcing bars are used in concrete structures to improve strength, and are bound with a wire so that the reinforcing bars do not shift from their predetermined positions during concrete placement.

[0003] Conventionally, a binding machine called a reinforcing bar binding 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 bind the two or more reinforcing bars with the wire.

[0004] When binding reinforcing bars with a wire, if the binding is loose, the reinforcing bars will shift from each other, so it is required to firmly hold the reinforcing bars together. Therefore, in a binding machine that winds a wire around the periphery of a reinforcing bar and twists the wire to bind the reinforcing bar, a binding machine has been proposed that improves the binding force by pulling back the excess portion of the wire (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] When pulling back the excess portion of the wire, in order to remove the slack caused by the excess portion of the wire, it is necessary to pull back the wire with a strong force. In order to pull back the wire with a strong force, for example, if the configuration is such that the wire is sandwiched and fed between a pair of feeding members, it is necessary to increase the force pressing the feeding members against the wire.

[0007] However, when the wire is fed in the forward direction of winding around the reinforcing bar, the load applied to the wire also increases, so the feeding speed of the wire decreases. Further, if the wire is fed in the forward direction with a force stronger than necessary, the wire may buckle midway.

[0008] The present invention has been made to solve such problems, and an object thereof is to provide a binding machine configured to apply an appropriate load to the wire when pulling the wire back.

Means for Solving the Problems

[0009] To solve the above-described problems, the present invention provides a wire feeding section for feeding a wire, a curl forming section for forming a path for winding the wire fed in the wire feeding section around an object to be bound, a cutting section for cutting the wire wound around the object to be bound, and a binding section for twisting the wire wound around the object to be bound and cut by the cutting section. The wire feeding section includes a pair of feeding gears for sandwiching and feeding the wire, a first guide surface that faces one of the feeding gears, is curved along the outer periphery of one of the feeding gears, and is provided at a position spaced a predetermined distance from the outer periphery, and a second guide surface that has a starting point with respect to the feeding direction located downstream of the starting point of the first guide surface and that faces the first guide surface with a gap through which the wire can move in the radial direction of one of the feeding gears, and is a binding machine. In the forward direction and in the direction opposite to the forward direction a wire feeding section for feeding a wire, and a curl forming section for forming a path for winding the wire fed in the wire feeding section around an object to be bound Forward in a direction, a cutting section for cutting the wire wound around the object to be bound, and a binding section for twisting the wire wound around the object to be bound and cut by the cutting section. The wire feeding section Sent in the reverse direction by the wire feed section includes a pair of feeding gears for sandwiching and feeding the wire, a first guide surface that faces one of the feeding gears, is curved along the outer periphery of one of the feeding gears, and is provided at a position spaced a predetermined distance from the outer periphery, and a second guide surface that has a starting point with respect to the feeding direction located downstream of the starting point of the first guide surface and that faces the first guide surface with a gap through which the wire can move in the radial direction of one of the feeding gears A pair of feed gears in which a gear portion is formed on the outer periphery and a continuous groove portion is formed along the circumferential direction. When the gear portions of the pair of feed gears mesh with each other with the wire in the groove portion for sandwiching the wire The wire is fed by a rotational operation and feeding it, a first guide surface that faces one of the feeding gears, is curved along the outer periphery of one of the feeding gears, and is provided at a position spaced a predetermined distance from the outer periphery, and a second guide surface that has a starting point with respect to the feeding direction located downstream of the starting point of the first guide surface and that faces the first guide surface with a gap through which the wire can move in the radial direction of one of the feeding gears On the downstream side in the forward direction from the meshing portion of the pair of feed gears and a second guide surface that faces the first guide surface with a gap through which the wire can move in the radial direction of one of the feeding gears, and is a binding machine. Forward feeding of the wire The starting point with respect to the feeding direction is located downstream of the starting point of the first guide surface, and It is provided at the position where the wire enters the groove portion of one of the feed gears, the wire passes between it and the first guide surface, and has a second guide surface that faces the first guide surface with a gap through which the wire can move in the radial direction of one of the feeding gears And, with respect to the forward feeding direction of the wire, on the downstream side from the meshing portion, it is provided with a wire guide that bends the wire feeding path along the outer shape of one of the feed gears. When the wire is fed in the forward direction by the rotational operation of the pair of feed gears, a force in the direction of separating from one of the feed gears is applied to the wire, and the wire is displaced in the direction of separating from one of the feed gears until it contacts the first guide surface, and the portion where the wire contacts one of the feed gears becomes the meshing portion. On the other hand, when the wire is fed in the reverse direction, a force in the direction of approaching one of the feed gears is applied to the wire, and the wire is displaced until it contacts the second guide surface, and the portion where the wire contacts one of the feed gears becomes the range from the meshing portion to the starting portion of the second guide surface, so that the contact amount between one of the feed gears and the wire when feeding the wire in the reverse direction is increased compared to when feeding the wire in the forward direction is a binding machine.

[0010] In the present invention, in the operation of feeding the wire Forward in a direction and winding it around the object to be bound, the load applied to the wire from the feeding gear is smaller than in the operation of feeding the wire in the Forward direction opposite to the Reverse direction and winding it around the object to be bound. Thus, without increasing the load applied to the wire from the feeding gear when feeding the wire in the Forward direction, the wire can be pulled back with a strong force. Effect of the Invention

[0011] In the present invention, the wire wound around the bundle is Feed in the reverse direction By pulling back the wire, the wire can be wound tightly around the object to be bound, improving the binding strength. Forward In the case of feeding the wire in the forward direction, the load applied to the wire from the feeding member does not increase more than necessary, and a decrease in the wire feeding speed can be suppressed. Furthermore, the occurrence of buckling of the wire caused by an increase in the force feeding the wire in the forward direction can be suppressed. [Brief description of the drawings]

[0012]

Figure 1A

Figure 1B

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 5A

Figure 5B

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Figure 10A

Figure 10B

Embodiments for Carrying Out the Invention

[0013] Hereinafter, with reference to the drawings, an example of a steel bar tying machine as an embodiment of the tying machine of the present invention will be described.

[0014] <Configuration Example of the Steel Bar Tying Machine According to this Embodiment> FIG. 1A is an internal configuration view seen from the side showing an example of the overall configuration of the steel bar tying machine according to this embodiment, and FIG. 1B is an internal configuration view seen from the top showing an example of the overall configuration of the steel bar tying machine according to this embodiment.

[0015] The steel bar tying machine 1A feeds the wire W in the forward direction indicated by the arrow F, winds it around the steel bar S which is the object to be tied, sends the wire W wound around the steel bar S in the reverse direction indicated by the arrow R and winds it around the steel bar S, and then twists the wire W to tie the steel bar S with the wire W.

[0016] To achieve the functions described above, the steel bar tying machine 1A includes a magazine 2A for accommodating the wire W and a wire feeding section 3A for feeding the wire W. Further, the steel bar tying machine 1A includes a curl forming section 5A that forms a path for winding the wire W sent by the wire feeding section 3A around the steel bar S, and a cutting section 6A for cutting the wire W wound around the steel bar S. Furthermore, the steel bar tying machine 1A includes a tying section 7A for twisting the wire W wound around the steel bar S and a driving section 8A for driving the tying section 7A.

[0017] The steel bar tying machine 1A is in a form that can be held and used by an operator, and includes a main body section 10A and a handle section 11A. In the steel bar tying machine 1A, the side where the curl forming section 5A is provided in the main body section 10A is referred to as the front side, and the side where the handle section 11A held by the operator is provided is referred to as the lower side.

[0018] The magazine 2A is an example of a storage section, and is provided on the rear side of the main body section 10A, which is opposite to the front side where the curl forming section 5A is provided. The magazine 2A rotatably and detachably houses a reel 20 around which a long wire W is wound so as to be payed out. The wire W is a wire made of a metal wire that can be plastically deformed, a wire in which the metal wire is coated with resin, or a stranded wire. The reel 20 has one or more wires W wound around a hub section (not shown), and one or a plurality of wires W can be drawn out from the reel 20 simultaneously.

[0019] The wire feeding section 3A includes a pair of feeding gears 30a and 30b for sandwiching and feeding the wire W. Although the details of the wire feeding section 3A will be described later, by switching the rotation directions of the feeding gears 30a and 30b, the forward and reverse feeding directions of the wire W can be switched.

[0020] The curl forming section 5A includes a curl guide 50 that imparts a curl to the wire W fed by the wire feeding section 3A, and a guiding guide 51 that guides the wire W with a curl imparted by the curl guide 50 to the binding section 7A, and is provided on the front side of the main body section 10A. In the steel bar tying machine 1A, the path of the wire W fed by the wire feeding section 3A is restricted by the curl forming section 5A, so that the locus of the wire W forms a loop Ru as shown in Fig. 1A, and the wire W is wound around the steel bar S.

[0021] The cutting section 6A includes a movable blade section that cuts the wire W in cooperation with a fixed blade section (not shown), and a transmission mechanism 62 that transmits the operation of the binding section 7A to the movable blade section. The transmission mechanism 62 transmits the operation of the binding section 7A to a movable blade section (not shown) via a moving member 83, operates the movable blade section 61 in conjunction with the operation of the binding section 7A, and cuts the wire W.

[0022] The binding section 7A includes a wire locking body 70 to which the wire W is locked. The drive section 8A includes a motor 80 and a speed reducer 81 that performs speed reduction and torque amplification.

[0023] The steel bar tying machine 1A includes a feed restricting section 90 against which the tip of the wire W abuts in the feed path of the wire W locked by the wire locking body 70. Further, in the steel bar tying machine 1A, the curl guide 50 and the guiding guide 51 of the curl forming section 5A described above are provided at the front end of the main body section 10A. Furthermore, in the steel bar tying machine 1A, a butting section 91 against which the steel bar S abuts is provided between the curl guide 50 and the guiding guide 51 at the front end of the main body section 10A.

[0024] Also, in the steel bar tying machine 1A, the handle section 11A extends downward from the main body section 10A, and a battery 15A is detachably attached to the lower part of the handle section 11A. In the steel bar tying machine 1A, the above-described wire feeding section 3A, cutting section 6A, binding section 7A, and drive section 8A are housed in the main body section 10A.

[0025] The steel bar tying machine 1A is provided with a trigger 12A on the front side of the handle portion 11A, and a switch 13A is provided inside the handle portion 11A. The steel bar tying machine 1A controls the motor 80 and the feed motor 36 according to the state of the switch 13A pushed by the operation of the trigger 12A by a control unit (not shown).

[0026] FIG. 2A is a perspective view showing an example of the wire feed portion of the present embodiment, and FIG. 2B is a side sectional view showing an example of the wire feed portion of the present embodiment. Hereinafter, the details of the wire feed portion 3A will be described with reference to each figure.

[0027] The wire feed portion 3A includes a pair of feed gears 30a and 30b that sandwich and feed one or a plurality of parallel wires W. In the following example, an example of feeding one wire W will be described.

[0028] The feed gear 30a is an example of a feed member, and a gear portion 32a having a spur gear shape is provided on the outer periphery of a disk shape that rotates about a shaft 31a as a fulcrum. Further, the feed gear 30a includes a groove portion 33a that is continuous along the circumferential direction near the center in the thickness direction of the gear portion 32a. The groove portion 33a has a V-shaped cross-sectional shape along the thickness direction of the gear portion 32a as viewed from the direction along the circumferential direction, and the two opposing surfaces are in contact with the wire W.

[0029] The feed gear 30b is an example of a feed member, and a gear portion 32b having a spur gear shape is provided on the outer periphery of a disk shape that rotates about a shaft 31b as a fulcrum. Further, the feed gear 30b includes a groove portion 33b that is continuous along the circumferential direction near the center in the thickness direction of the gear portion 32b. The groove portion 33b has a V-shaped cross-sectional shape along the thickness direction of the gear portion 32b as viewed from the direction along the circumferential direction, and the two opposing surfaces are in contact with the wire W.

[0030] The feed gear 30a and the feed gear 30b are provided to face each other across the wire feed path W1 with their axial directions parallel to each other, and the gear portion 32a of the feed gear 30a meshes with the gear portion 32b of the feed gear 30b. Further, the groove portion 33a of the feed gear 30a and a groove portion (not shown) of the feed gear 30b face each other in parallel directions.

[0031] The wire feeding section 3A includes a support member 34 that supports the feed gear 30b so as to be movable in a direction of approaching and separating from the feed gear 30a, and a spring 35 that biases the feed gear 30b in a direction of approaching the feed gear 30a via the support member 34.

[0032] One end of the support member 34 is rotatably supported by a shaft 34a, and the other end is biased by the spring 35. Further, the shaft 31b of the feed gear 30b is provided between the shaft 34a and the spring 35, and the feed gear 30b is rotatably supported.

[0033] Thus, in the wire feeding section 3A, by the rotational movement of the support member 34 with the shaft 34a as a fulcrum, the feed gear 30b moves in a direction of approaching and separating from the feed gear 30a, and the feed gear 30b is biased in a direction of approaching the feed gear 30a by the spring 35. Further, in the wire feeding section 3A, since the feed gear 30b is biased in a direction of approaching the feed gear 30a by the spring 35, the wire W is clamped between the groove portion 33a of the feed gear 30a and the groove portion 33b of the feed gear 30b.

[0034] The wire feeding section 3A includes a feed motor 36 that drives the feed gear 30a, and a plurality of transmission gears 37 that transmit a driving force to the feed gear 30a. When the feed motor 36 is driven and the feed gear 30a rotates in the wire feeding section 3A, the gears mesh with each other and the feed gear 30b rotates as a follower.

[0035] The wire W clamped between the groove portion 33a of the feed gear 30a and the groove portion 33b of the feed gear 30b contacts a part of the surface along the circumferential direction of the groove portion 33a of the feed gear 30a and a part of the surface along the circumferential direction of the groove portion 33b of the feed gear 30b.

[0036] The feed gear 30a rotates in the forward direction indicated by the arrow C1 and the reverse direction indicated by the arrow C2, and the position where the wire W contacts in the groove portion 33a is displaced in the circumferential direction. As a result, when the feed gears 30a and 30b rotate, the wire W sandwiched between the groove portion 33a of the feed gear 30a and the groove portion 33b of the feed gear 30b in the wire feed section 3A is fed in one direction indicated by the arrow F, i.e., the forward direction, or the other direction indicated by the arrow R, i.e., the reverse direction, according to the rotation direction of the feed gear 30a.

[0037] As shown in Fig. 1A, in the steel bar tying machine 1A, the feeding path of the wire W from the magazine 2A provided at the rear side of the main body 10A to the wire feed section 3A extends in the front-rear direction. Between the magazine 2A and the wire feed section 3A, for example, a cylindrical guide member 39 for guiding the wire W is provided.

[0038] Also, in the steel bar tying machine 1A, the feeding path of the wire W from the wire feed section 3A to the cutting section 6A, the tying section 7A, and the curl guide 50 of the curl forming section 5A provided at the front side of the main body 10A extends in the vertical direction. And as shown in Figs. 2A and 2B, the feeding path W1 of the wire W is bent at the wire feed section 3A.

[0039] The feed gear 30a is arranged inside, i.e., on the bending center side, in the feeding path of the wire W bent at the wire feed section 3A, and is configured to have a larger diameter than the feed gear 30b.

[0040] The meshing portion P1 where the gear portion 32a of the feed gear 30a meshes with the gear portion 32b of the feed gear 30b is on the straight line L1 connecting the axis 31a of the feed gear 30a and the axis 31b of the feed gear 30b. For the feed gear 30a and the feed gear 30b, the tangent line at the meshing portion P1 is perpendicular to the straight line L1 connecting the axis 31a of the feed gear 30a and the axis 31b of the feed gear 30b.

[0041] Thereby, in the feeding path W1 of the wire W, the wire W is sandwiched between the groove portion 33a of the feed gear 30a and the groove portion 33b of the feed gear 30b at the meshing portion P1.

[0042] The wire feeding section 3A includes a wire guide 38 that bends the feeding path W1 of the wire W along the feeding gear 30a and controls the displacement amount of the wire W that is displaced in a direction of approaching and separating from the feeding gear 30a. The wire guide 38 is provided on the downstream side of the meshing portion P1 between the feeding gear 30a and the feeding gear 30b with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F.

[0043] The wire guide 38 includes a first guide surface 38a that faces the feeding gear 30a on the downstream side of the meshing portion P1 with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F. The first guide surface 38a has a shape that is concave and curved along the outer periphery of the gear portion 32a of the feeding gear 30a, and is provided at a position spaced apart from the outer periphery of the gear portion 32a by a predetermined interval.

[0044] Further, the wire guide 38 includes a second guide surface 38b on the downstream side at a predetermined interval from the meshing portion P1 between the feeding gear 30a and the feeding gear 30b with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F, and on the downstream side of the starting point portion P2 of the first guide surface 38a. The second guide surface 38b is an example of a regulating portion. The starting point portion P3 of the second guide surface 38b is provided at a position where it enters the groove portion 33a of the feeding gear 30a. A gap is provided between the first guide surface 38a and the second guide surface 38b through which the wire W passes and the wire W can move in the radial direction of the feeding gear 30a, and the second guide surface 38b faces the first guide surface 38a. Furthermore, the wire guide 38 includes a wear prevention member 38c on the second guide surface 38b. The wear prevention member 38c is made of a material harder than the material constituting the second guide surface 38b. For example, a columnar member is provided with a part of its outer peripheral surface exposed on the second guide surface 38b. The wear prevention member 38c suppresses the wear of the second guide surface 38b when the wire W slides on the second guide surface 38b during the operation of feeding the wire W in the reverse direction indicated by the arrow R.

[0045] As a result, on the downstream side of the meshing portion P1 between the feeding gear 30a and the feeding gear 30b with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F, the feeding path W1 of the wire W is bent along the outer shape of the feeding gear 30a.

[0046] When the wire W is fed in the positive direction indicated by the arrow F, the portion where the feed path W1 of the wire W bends along the feed gear 30a is on the downstream side of the meshing portion P1 between the feed gear 30a and the feed gear 30b. Thereby, when the wire W is fed in the positive direction indicated by the arrow F, on the downstream side of the meshing portion P1 between the feed gear 30a and the feed gear 30b, a force in the direction away from the feed gear 30a acts on the wire W. The feed path W1 of the wire W when the wire W is fed in the positive direction indicated by the arrow F is shown by a broken line in FIG. 2B. When the wire W is displaced in the direction away from the feed gear 30a, the displacement amount of the wire W in the direction away from the feed gear 30a is controlled by the wire W contacting the first guide surface 38a of the wire guide 38.

[0047] On the other hand, when the wire W is fed in the reverse direction indicated by the arrow R, the portion where the feed path W1 of the wire W bends along the feed gear 30a is on the upstream side of the meshing portion P1 between the feed gear 30a and the feed gear 30b. Thereby, when the wire W is fed in the reverse direction indicated by the arrow R, on the upstream side of the meshing portion P1 between the feed gear 30a and the feed gear 30b, a force in the direction approaching the feed gear 30a acts on the wire W. The feed path W1 of the wire W when the wire W is fed in the reverse direction indicated by the arrow R is shown by a two-dot chain line in FIG. 2B. When a force in the direction approaching the feed gear 30a acts on the wire W during the operation of feeding the wire W in the reverse direction indicated by the arrow R, the wire W is displaced until it contacts the second guide surface 38b of the wire guide 38. Thereby, the amount of contact between the feed gear 30a and the wire W is switched according to the direction in which the wire W is fed.

[0048] FIG. 3A is a top view showing an example of the bundling portion and the driving portion, and FIG. 3B is a top cross-sectional view showing an example of the bundling portion and the driving portion. Next, with reference to each figure, the details of the bundling portion 7A and the connection structure between the bundling portion 7A and the driving portion 8A will be described.

[0049] The end portion 7A includes a wire locking body 70 to which the wire W is locked and a rotating shaft 72 for operating the wire locking body 70. The end portion 7A and the drive portion 8A are connected such that the rotating shaft 72 and the motor 80 are connected via a speed reducer 81, and the rotating shaft 72 is driven by the motor 80 via the speed reducer 81.

[0050] The wire locking body 70 includes a center hook 70C connected to the rotating shaft 72, a first side hook 70L and a second side hook 70R that open and close with respect to the center hook 70C, and a sleeve 71 that operates the first side hook 70L and the second side hook 70R and forms the wire W into a desired shape.

[0051] In the end portion 7A, the side where the center hook 70C, the first side hook 70L, and the second side hook 70R are provided is defined as the front side, and the side where the rotating shaft 72 is connected to the speed reducer 81 is defined as the rear side.

[0052] The center hook 70C is connected to the front end, which is one end of the rotating shaft 72, via a configuration that is rotatable with respect to the rotating shaft 72 and axially movable integrally with the rotating shaft 72.

[0053] The first side hook 70L has its front end side, which is one end along the axial direction of the rotating shaft 72, located on one side portion with respect to the center hook 70C. Also, the rear end side, which is the other end along the axial direction of the rotating shaft 72, of the first side hook 70L is rotatably supported by the center hook 70C via a shaft 71b.

[0054] The second side hook 70R has its front end side, which is one end along the axial direction of the rotating shaft 72, located on the other side portion with respect to the center hook 70C. Also, the rear end side, which is the other end along the axial direction of the rotating shaft 72, of the second side hook 70R is rotatably supported by the center hook 70C via a shaft 71b.

[0055] As a result, the wire locking body 70 opens and closes in a direction in which the tip side of the first side hook 70L comes into and out of contact with the center hook 70C by a rotational operation with the shaft 71b as a fulcrum. Also, the tip side of the second side hook 70R opens and closes in a direction in which it comes into and out of contact with the center hook 70C.

[0056] The sleeve 71 has a convex portion (not shown) that protrudes from the inner peripheral surface of the space into which the rotary shaft 72 is inserted, and this convex portion fits into a groove portion of a feed screw 72a formed along the axial direction on the outer periphery of the rotary shaft 72. When the rotary shaft 72 rotates, the sleeve 71 moves in the front-rear direction, which is the direction along the axial direction of the rotary shaft 72, according to the rotation direction of the rotary shaft 72 due to the action of the convex portion (not shown) and the feed screw 72a of the rotary shaft 72. Also, the sleeve 71 rotates integrally with the rotary shaft 72.

[0057] The sleeve 71 is provided with an opening / closing pin 71a that opens and closes the first side hook 70L and the second side hook 70R.

[0058] The opening / closing pin 71a is inserted into opening / closing guide holes 73 provided in the first side hook 70L and the second side hook 70R. The opening / closing guide holes 73 extend along the moving direction of the sleeve 71, and have a shape that converts the linear movement of the opening / closing pin 71a that moves in conjunction with the sleeve 71 into an opening / closing operation by the rotation of the first side hook 70L and the second side hook 70R with the shaft 71b as a fulcrum.

[0059] When the sleeve 71 moves in the rear direction indicated by the arrow A2, the first side hook 70L and the second side hook 70R move away from the center hook 70C by a rotational operation with the shaft 71b as a fulcrum due to the locus of the opening / closing pin 71a and the shape of the opening / closing guide holes 73 of the wire locking body 70.

[0060] As a result, the first side hook 70L and the second side hook 70R open with respect to the center hook 70C, and a feed path through which the wire W passes is formed between the first side hook 70L and the center hook 70C and between the second side hook 70R and the center hook 70C.

[0061] When the first side hook 70L and the second side hook are open with respect to the center hook 70C, the wire W sent by the wire feeding unit 3A passes between the center hook 70C and the first side hook 70L. The wire W passing between the center hook 70C and the first side hook 70L is guided to the curl forming unit 5A. Then, the wire W that is curled by the curl forming unit 5A and guided to the bundling unit 7A passes between the center hook 70C and the second side hook 70R.

[0062] When the sleeve 71 of the wire locking body 70 moves in the forward direction indicated by the arrow A1, the first side hook 70L and the second side hook 70R move in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum due to the locus of the opening and closing pin 71a and the shape of the opening and closing guide hole 73. As a result, the first side hook 70L and the second side hook 70R close with respect to the center hook 70C.

[0063] When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form that allows it to move between the first side hook 70L and the center hook 70C. Also, when the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that does not allow it to escape between the second side hook 70R and the center hook 70C.

[0064] As shown in FIG. 1A, the sleeve 71 includes a bending portion 71c1 that forms the wire W into a predetermined shape by pushing and bending the tip side, which is one end of the wire W, in a predetermined direction, and a bending portion 71c2 that forms the wire W into a predetermined shape by pushing and bending the terminal side, which is the other end of the wire W cut by the cutting portion 6A, in a predetermined direction.

[0065] By moving in the forward direction indicated by arrow A1, the sleeve 71 presses the tip side of the wire W locked by the center hook 70C and the second side hook 70R with the bending portion 71c1 and bends it toward the reinforcing bar S side. Further, by moving in the forward direction indicated by arrow A1, the sleeve 71 presses the terminal side of the wire W locked by the center hook 70C and the first side hook 70L and cut by the cutting portion 6A with the bending portion 71c2 and bends it toward the reinforcing bar S side.

[0066] The bundling portion 7A includes a rotation restricting portion 74 that restricts the rotation of the wire locking body 70 and the sleeve 71 interlocked with the rotation operation of the rotation shaft 72. The rotation restricting portion 74 is provided with rotation restricting vanes 74a on the sleeve 71 and rotation restricting claws 74b on the main body portion 10A.

[0067] The rotation restricting vanes 74a are configured by providing a plurality of convex portions protruding radially from the outer periphery of the sleeve 71 at predetermined intervals in the circumferential direction of the sleeve 71. The rotation restricting vanes 74a are fixed to the sleeve 71 and move and rotate integrally with the sleeve 71.

[0068] In the operating range where the rotation restricting portion 74 locks the wire W with the wire locking body 70, winds the wire W around the reinforcing bar S and then cuts it, and further bends and forms the wire W with the bending portions 71c1 and 71c2 of the sleeve 71, the rotation restricting vanes 74a are locked to the rotation restricting claws 74b. When the rotation restricting vanes 74a are locked to the rotation restricting claws 74b, the rotation of the sleeve 71 interlocked with the rotation of the rotation shaft 72 is restricted, and the sleeve 71 moves in the front-rear direction by the rotation operation of the rotation shaft 72.

[0069] Further, in the operating range where the rotation restricting portion 74 twists the wire W locked by the wire locking body 70, the locking of the rotation restricting vanes 74a to the rotation restricting claws 74b is released. When the locking of the rotation restricting vanes 74a to the rotation restricting claws 74b is released, the sleeve 71 rotates in conjunction with the rotation of the rotation shaft 72. The wire locking body 70 rotates the center hook 70C, the first side hook 70L, and the second side hook 70R that lock the wire W in conjunction with the rotation of the sleeve 71.

[0070] The end portion 7A is provided such that the moving member 83 can move in conjunction with the sleeve 71. The moving member 83 is rotatably attached to the sleeve 71 and moves in the front-rear direction in conjunction with the sleeve 71 without being linked to the rotation of the sleeve 71.

[0071] When the moving member 83 moves in the front-rear direction in conjunction with the sleeve 71 in the end portion 7A, the moving member 83 engages with the transmission mechanism 62, causing the movable blade portion (not shown) of the cutting portion 6A to operate. As a result, in the operation where the sleeve 71 moves forward, the wire W is cut by the cutting portion 6A.

[0072] The rotary shaft 72 is configured to be rotatable integrally with the speed reducer 81 and axially movable with respect to the speed reducer 81. The rear end, which is the other end, is connected to the speed reducer 81 via a connecting portion 72b. The connecting portion 72b includes a spring 72c that biases the rotary shaft 72 rearward in the direction approaching the speed reducer 81. Thus, the rotary shaft 72 is configured to be movable forward in the direction away from the speed reducer 81 while receiving the force of being pushed rearward by the spring 72c. Therefore, when a force is applied to move the wire locking body 70 forward along the axial direction, the rotary shaft 72 can move forward while receiving the force of being pushed rearward by the spring 72c.

[0073] <Operation example of the reinforcing bar tying machine of the present embodiment> FIG. 4A is a side view of the main part of the reinforcing bar tying machine of the present embodiment, and FIG. 4B is a front view of the main part of the reinforcing bar tying machine of the present embodiment, showing the operation during wire feeding.

[0074] FIG. 5A is a side view of the main part of the reinforcing bar tying machine of the present embodiment, and FIG. 5B is a front view of the main part of the reinforcing bar tying machine of the present embodiment, showing the operation during wire locking.

[0075] FIGS. 6A to 9A are side views of the main part of the reinforcing bar tying machine of the present embodiment, and FIGS. 6B to 9B are front views of the main part of the reinforcing bar tying machine of the present embodiment, showing the operation during reverse wire feeding.

[0076] Next, with reference to each drawing, the operation of binding the reinforcing bar S with the wire W by the reinforcing bar tying machine 1A of the first embodiment will be described.

[0077] When the reinforcing bar S is placed between the curl guide 50 and the guide guide 51 of the curl forming portion 5A and the trigger 12A is operated, the feed motor 36 is driven in the forward rotation direction, and as shown in Fig. 4A, the wire W is fed in the positive direction indicated by the arrow F by the wire feed portion 3A.

[0078] The wire W drawn from the reel 20 stored in the magazine 2A is guided to the wire feed portion 3A in a direction along the front-rear direction by the guide member 39, and is sandwiched between the feed gear 30a and the feed gear 30b at the meshing portion P1 of the feed gear 30a and the feed gear 30b. The wire W sandwiched between the feed gear 30a and the feed gear 30b is bent at the wire guide 38 on the downstream side of the meshing portion P1 of the feed gear 30a and the feed gear 30b with respect to the feeding direction of the wire W in the positive direction indicated by the arrow F, and is guided between the cutting portion 6A, the center hook 70C of the tying portion 7A and the first side hook 70L, and to the curl guide 50 of the curl forming portion 5A.

[0079] Here, when the wire W is fed in the positive direction indicated by the arrow F, as a value defining the position of the wire feed portion 3A, for example, the angle D1 between the straight line L1 connecting the axis 31a of the feed gear 30a and the axis 31b of the feed gear 30b and the straight line passing through the intersection P4 of the meshing portion P1 of the feed gear 30a and the feed gear 30b, the rotation center Cp of the wire locking body 70, and the wire feed path W1 of the wire W is 80° or less.

[0080] The wire W fed in the positive direction passes between the center hook 70C and the first side hook 70L and is sent to the curl guide 50 of the curl forming portion 5A. The wire W is wound around the reinforcing bar S by passing through the curl guide 50.

[0081] The wire W with a curl formed by the curl guide 50 is guided by the guide guide 51 and further fed in the forward direction by the wire feed section 3A, and thus is guided between the center hook 70C and the second side hook 70R by the guide guide 51. Then, the wire W is fed until its tip abuts against the feed regulation section 90. When the tip of the wire W is fed to the position where it abuts against the feed regulation section 90, the driving of the feed motor 36 is stopped.

[0082] After the forward feeding of the wire W is stopped, the motor 80 is driven in the forward rotation direction. In the first operating range where the sleeve 71 locks the wire W with the wire locking body 70, the rotation of the sleeve 71 linked to the rotation of the rotating shaft 72 is restricted because the rotation restricting blade 74a is locked to the rotation restricting claw 74b. As a result, as shown in FIG. 5A, the rotation of the motor 80 of the sleeve 71 is converted into linear movement, and the sleeve 71 moves in the forward direction, the direction of arrow A1.

[0083] When the sleeve 71 moves forward, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the first side hook 70L closes with respect to the center hook 70C, the wire W sandwiched between the first side hook 70L and the center hook 70C is locked in a form that allows it to move between the first side hook 70L and the center hook 70C.

[0084] Also, the second side hook 70R moves in a direction approaching the center hook 70C by a rotational movement with the shaft 71b as a fulcrum. When the second side hook 70R closes with respect to the center hook 70C, the wire W sandwiched between the second side hook 70R and the center hook 70C is locked in a form that does not allow it to escape from between the second side hook 70R and the center hook 70C.

[0085] After advancing the sleeve 71 to the position where the first side hook 70L and the second side hook 70R lock the wire W in the closing operation, the rotation of the motor 80 is temporarily stopped, and the feed motor 36 is driven in the reverse rotation direction.

[0086] When the feed motor 36 is driven in the reverse rotation direction, the feed gear 30a reverses, and the feed gear 30b is driven to reverse as a follower. As a result, the wire W sandwiched between the feed gear 30a and the feed gear 30b is sent in the reverse direction indicated by the arrow R. Since the tip side of the wire W wound around the reinforcing bar S is locked in a form that cannot escape between the second side hook 70R and the center hook 70C, in the operation of sending the wire W in the reverse direction, as shown in FIGS. 6A to 6B, it is displaced in the direction approaching the reinforcing bar S from the side of the guide guide 51.

[0087] When the wire W displaced in the direction approaching the reinforcing bar S from the side of the guide guide 51 contacts the reinforcing bar S as shown in FIGS. 7A to 7B, as shown in FIGS. 8A to 8B, the wire W on the side of the curl guide 50 is displaced in the direction approaching the reinforcing bar S. Then, in the operation of further sending the wire W in the reverse direction, the wire W displaced in the direction approaching the reinforcing bar S from the side of the curl guide 50 contacts the reinforcing bar S as shown in FIGS. 9A to 9B.

[0088] FIG. 10A is a side sectional view of the wire feed section showing an example of the operation when the wire is sent in the forward direction, and FIG. 10B is a side sectional view of the wire feed section showing an example of the operation when the wire is sent in the reverse direction.

[0089] When the wire W is sent in the forward direction indicated by the arrow F, the portion where the feed path W1 of the wire W bends along the feed gear 30a is downstream of the meshing portion P1 between the feed gear 30a and the feed gear 30b. As a result, as shown in FIG. 10A, when the wire W is sent in the forward direction indicated by the arrow F, a force in the direction away from the feed gear 30a is applied to the wire W. When the wire W is displaced in the direction away from the feed gear 30a until it reaches the position where it contacts the first guide surface 38a of the wire guide 38, the portion where the wire W contacts the feed gear 30a becomes the meshing portion P1 between the feed gear 30a and the feed gear 30b.

[0090] On the other hand, when the wire W is sent in the reverse direction indicated by the arrow R, the portion where the feeding path W1 of the wire W bends along the feeding gear 30a is upstream of the meshing portion P1 between the feeding gear 30a and the feeding gear 30b. As a result, as shown in FIG. 10B, when the wire W is sent in the reverse direction indicated by the arrow R, a force in the direction approaching the feeding gear 30a is applied to the wire W whose feeding path W1 is bent along the feeding gear 30a.

[0091] When a force in the direction approaching the feeding gear 30a is applied to the wire W during the operation of sending the wire W in the reverse direction indicated by the arrow R, the wire W is displaced until it contacts the second guide surface 38b of the wire guide 38.

[0092] When the wire W is displaced until it contacts the second guide surface 38b of the wire guide 38 during the operation of sending the wire W in the reverse direction indicated by the arrow R, the portion where the wire W contacts the feeding gear 30a ranges from the meshing portion P1 between the feeding gear 30a and the feeding gear 30b to the starting portion P3 of the second guide surface 38b of the wire guide 38.

[0093] The portion where the wire W contacts the feeding gear 30a is the meshing portion P1 between the feeding gear 30a and the feeding gear 30b during the operation of sending the wire W in the forward direction indicated by the arrow F. On the other hand, during the operation of sending the wire W in the reverse direction indicated by the arrow R, the range is from the meshing portion P1 between the feeding gear 30a and the feeding gear 30b to the starting portion P3 of the second guide surface 38b of the wire guide 38, and the contact amount between the wire W and the feeding gear 30a increases compared to the case of sending the wire W in the forward direction indicated by the arrow F. Note that during the operation of sending the wire W in the reverse direction indicated by the arrow R, the portion where the wire W contacts the feeding gear 30a does not have to be the entire range from the meshing portion P1 to the starting portion P3 as long as the contact amount between the wire W and the feeding gear 30a increases compared to the case of sending the wire W in the forward direction indicated by the arrow F.

[0094] Thus, when the wire W is fed in the reverse direction indicated by the arrow R, the contact amount Lf (contact angle Dr) between the wire W and the feed gear 30a increases as compared with the case where the wire W is fed in the forward direction indicated by the arrow F. Therefore, the load applied to the wire W from the feed gear 30a increases, and the tension applied to the wire W increases when the wire W is fed in the reverse direction indicated by the arrow R as compared with the case where the wire W is fed in the forward direction indicated by the arrow F.

[0095] Therefore, the wire W that is displaced in the direction approaching the reinforcing bar S from the side of the guiding guide 51 and the wire W that is displaced in the direction approaching the reinforcing bar S from the side of the curling guide 50 are wound so as to be in close contact with the reinforcing bar S.

[0096] Also, without making the pressing force of the spring 35 that presses the wire W against the feed gear 30a via the feed gear 30b stronger than necessary, the load applied to the wire W from the feed gear 30a can be increased when the wire W is fed in the reverse direction indicated by the arrow R. Therefore, when the wire W is fed in the forward direction indicated by the arrow F, the load applied to the wire W from the feed gear 30a does not increase more than necessary, and a decrease in the feed speed of the wire W can be suppressed. Further, the occurrence of buckling of the wire W due to an increase in the force for feeding the wire W in the forward direction can be suppressed.

[0097] Note that the feed gear 30a has a groove portion 33a formed along the circumferential direction in the gear portion 32a, and the wire W enters the groove portion 33a. As a result, the portion where the wire W contacts in the groove portion 33a is not a continuous surface in the circumferential direction but a discontinuous surface according to the presence or absence of the tooth portions of the gear portion 32a. Therefore, by making the feed gear 30a have a larger diameter than the feed gear 30b, the number of teeth of the gear portion 32a of the feed gear 30a can be made larger than that of the gear portion 32b of the feed gear 30b. Thus, the contact surface between the feed gear 30a and the wire W can be increased, and the load applied to the wire W from the feed gear 30a can be increased.

[0098] Also, in the operation of sending the wire W in the reverse direction indicated by the arrow R, after the wire W is displaced until it contacts the second guide surface 38b of the wire guide 38, the wire W is sent in the forward direction in the next bundling operation. In this case, the second guide surface 38b is provided at a position where the starting point P3 enters the groove portion 33a of the feed gear 30a, so that the wire W is prevented from fitting into the groove portion 33a and being sent so as to wrap around the feed gear 30a, and can be guided to a predetermined feed path W1.

[0099] Furthermore, in a configuration for sending two or more wires W, a plurality of pairs of feed gears 30a and feed gears 30b may be provided along the axial direction according to the number of wires W. Alternatively, a configuration may be adopted in which groove portions 33a are provided at a plurality of locations along the axial direction on the outer peripheral surface of the feed gear 30a, and groove portions 33b are provided at a plurality of locations along the axial direction on the outer peripheral surface of the feed gear 30b. Furthermore, a configuration may be adopted in which groove portions 33a having a shape in which a plurality of wires W are arranged along the axial direction are provided on the outer peripheral surface of the feed gear 30a, and groove portions 33b having a shape in which a plurality of wires W are arranged along the axial direction are provided on the outer peripheral surface of the feed gear 30b. Note that the wire feeding unit 3A is not limited to a pair of feed gears having a gear portion formed on the outer periphery, and may be a pair of feed rollers whose outer peripheries are arranged to face each other.

[0100] After the wire W is wound around the reinforcing bar S and the driving of the feed motor 36 in the reverse rotation direction is stopped, the motor 80 is driven in the forward rotation direction to move the sleeve 71 in the forward direction indicated by the arrow A1. When the operation of moving the sleeve 71 in the forward direction is transmitted to the cutting portion 6A by the transmission mechanism 62, a movable blade portion (not shown) operates, and the wire W locked by the first side hook 70L and the center hook 70C is cut.

[0101] When the wire W is cut, the tip side of the wire W locked by the center hook 70C and the second side hook 70R is pressed by the bending portion 71c1 and bent toward the reinforcing bar S side. Also, the end side of the wire W locked by the center hook 70C and the first side hook 70L and cut by the cutting portion 6A is pressed by the bending portion 71c2 and bent toward the reinforcing bar S side.

[0102] After bending the tip side and the terminal side of the wire W toward the reinforcing bar S, when the motor 80 is further driven in the forward rotation direction, the sleeve 71 moves further forward. When the sleeve 71 moves to a predetermined position, it reaches the operating range for twisting the wire W locked by the wire locking body 70, and the locking with the rotation restricting claw 74b of the rotation restricting vane 74a is released.

[0103] As a result, when the motor 80 is further driven in the forward rotation direction, the sleeve 71 rotates in conjunction with the rotary shaft 72, and the wire W locked by the wire locking body 70 is twisted.

[0104] When the wire W locked by the wire locking body 70 is twisted, a force that pulls the wire locking body 70 forward along the axial direction of the rotary shaft 72 is applied to the bundling portion 7A. As a result, the rotary shaft 72 receives a force that is pushed rearward by the spring 72c, and twists the wire W while moving forward together with the wire locking body 70.

[0105] Therefore, while the wire locking body 70 and the rotary shaft 72 move in the forward direction, which is the direction in which the gap between the twisted portion of the wire W and the reinforcing bar S becomes smaller, the wire W is further twisted.

[0106] Accordingly, the wire W can be closely adhered to the reinforcing bar S in a form along the reinforcing bar S and bundled in a state where the wire W is closely adhered to the reinforcing bar S.

[0107] When it is detected that the load applied to the motor 80 has reached the maximum by twisting the wire W, the forward rotation of the motor 80 is stopped. Next, when the motor 80 is driven in the reverse rotation direction, the rotary shaft 72 rotates reversely. When the sleeve 71 rotates reversely following the reverse rotation of the rotary shaft 72, the rotation restricting vane 74a is locked to the rotation restricting claw 74b, and the rotation of the sleeve 71 interlocked with the rotation of the rotary shaft 72 is restricted. As a result, the sleeve 71 moves in the direction of arrow A2, which is the rear direction.

[0108] When the sleeve 71 moves rearward, the bent portions 71c1 and 71c2 move away from the wire W, and the holding of the wire W by the bent portions 71c1 and 71c2 is released. Also, when the sleeve 71 moves rearward, the opening and closing pin 71a passes through the opening and closing guide hole 73. As a result, the first side hook 70L moves in a direction away from the center hook 70C by a rotational movement about the shaft 71b as a fulcrum. Also, the second side hook 70R moves in a direction away from the center hook 70C by a rotational movement about the shaft 71b as a fulcrum. Thereby, the wire W comes out of the wire locking body 70.

Explanation of Signs

[0109] 1A ··· Steel bar bundling machine, 10A ··· Main body part, 2A ··· Magazine, 20 ··· Reel, 3A ··· Wire feeding part, 30a, 30b ··· Feeding gears (feeding members), 31a, 31b ··· Shafts, 32a, 32b ··· Gear parts, 33a ··· Groove part, 34 ··· Support member, 34a ··· Shaft, 35 ··· Spring, 36 ··· Feeding motor, 37 ··· Transmission gear, 38 ··· Wire guide, 38a ··· First guide surface, 38b ··· Second guide surface (restricting part), 39 ··· Guide member, P2, P3 ··· Starting parts, 5A ··· Crimp forming part, 50 ··· Crimp guide, 51 ··· Inductive guide, 6A ··· Cutting part, 7A ··· Bundling part, 70 ··· Wire locking body, 70L ··· First side hook, 70R ··· Second side hook, 70C ··· Center hook, 71 ··· Sleeve, 72 ··· Rotating shaft, 72a ··· Feeding screw, 72b ··· Connecting part, 72c ··· Spring, 74 ··· Rotation restricting part, 8A ··· Driving part, 80 ··· Motor, 81 ··· Reducer, 91 ··· Butting part, W ··· Wire

Claims

1. A wire feeding section that feeds a wire in a forward direction and in a direction opposite to the forward direction, A curl forming section that forms a path for winding the wire fed in the forward direction by the wire feeding section around a bundle, A cutting section that cuts the wire fed in the reverse direction by the wire feeding section and wound around the bundle, A binding section that winds the wire wound around the bundle and cut by the cutting section, and is provided with a binding section that twists the wire, The wire feeding section is, A pair of feed gears having a gear portion formed on the outer periphery and a continuous groove portion formed along the circumferential direction, wherein the wire is sandwiched by the gear portions of the pair of feed gears with the wire in the groove portion, and the wire is fed by a rotational operation. A pair of the feed gears, On the downstream side in the forward direction from the meshing portion of the pair of feed gears, it faces one of the feed gears, is curved along the outer periphery of one of the feed gears, and is provided at a position spaced a predetermined distance from the outer periphery. A first guide surface, and a starting point of the wire in the forward feeding direction is located on the downstream side from the starting point of the first guide surface, and is provided at a position where the wire enters the groove portion of one of the feed gears, and the wire passes between the first guide surface and the first guide surface. And a second guide surface facing the first guide surface with a gap in which the wire can move in the radial direction of one of the feed gears, and the wire is bent along the outer shape of one of the feed gears on the downstream side from the meshing portion with respect to the forward feeding direction of the wire. A wire guide, When the wire is fed in the forward direction by the rotational operation of the pair of feed gears, a force in the direction away from one of the feed gears acts on the wire, and the wire is displaced in the direction away from one of the feed gears until it contacts the first guide surface. The contact portion between the wire and one of the feed gears becomes the meshing portion. On the other hand, when the wire is fed in the reverse direction, a force in the direction approaching one of the feed gears acts on the wire, and the wire is displaced until it contacts the second guide surface. The contact portion between the wire and one of the feed gears becomes the range from the meshing portion to the starting point of the second guide surface, so that the contact amount between one of the feed gears and the wire when the wire is fed in the reverse direction is increased compared to the case where the wire is fed in the forward direction. A bundling machine.

2. One of the feed gears is configured to have a larger diameter than the other feed gear The tying machine according to claim 1.

Images