End machine

Abstract

To provide a binding machine which can easily perform removal of a wire even when feeding failure occurs.SOLUTION: A reinforcement binding machine 1A includes: a binding part 7A for twisting a wire; a curl guide 50 for curling the wire; and a leading guide 51A for leading the wire curled by the curl guide 50 to the binding part 7A. The curl guide 50 includes a retreat guide part 54A for retreating the wire W further to the downstream side than a locking member 70 of the binding part 7A with respect to the feeding of the wire W in the normal direction.SELECTED DRAWING: Figure15D

Description

[Technical field]

[0001] This relates to a bundling machine that uses wire to bundle objects such as reinforcing bars. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there has been proposed a binding machine known as a reinforcing bar binding machine, which wraps a wire around two or more reinforcing bars and twists the wire wound around the reinforcing bars to bind the two or more reinforcing bars with the wire.

[0003] The bundling machine winds the wire, which is fed by the driving force of a motor, around the rebar by passing it through a guide called a curl guide, etc., which gives the wire a curl. This curled wire is guided by a guide called an induction guide, etc., to a bundling section where the wire is twisted, and the wire wound around the rebar is twisted at the bundling section, thereby bundling the rebar with the wire.

[0004] In such a binding machine, if the wire continues to be fed in a state where the wire cannot be fed normally, the wire will deviate from the feeding path and become bent, which is called buckling. If the buckled wire is caught in a narrow space, it becomes difficult to remove the remaining wire. Therefore, a binding machine has been proposed that allows the wire to be removed even if it deviates from the feeding path and buckles (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-109299 A Summary of the Invention [Problem to be solved by the invention]

[0006] When a wire is fed through a guide such as a curl guide with an obstacle blocking the wire feed path, the wire comes into contact with the obstacle and cannot be fed beyond the curl guide, which may result in poor wire feeding. When poor wire feeding occurs accompanied by buckling, it becomes difficult to remove the wire with the poor wire feeding.

[0007] The present invention has been made to solve such problems, and has an object to provide a binding machine that makes it easy to remove the wire even if a feeding failure occurs. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the present invention provides a wire curling device that includes a wire feed section that feeds a wire to be wound around a bundle, a bundling section that twists the wire wound around the bundle, a curl guide that gives a curl to the wire fed by the wire feed section, a guide guide that guides the wire curled by the curl guide to the bundling section, and an evacuation guide section that evacuates the wire downstream of the bundling section with respect to the feed direction of the wire fed by the wire feed section in the direction in which the wire is curled by the curl guide, and the curl guide includes first and second guide plates and a wire curling section sandwiched between the first and second guide plates. a third guide plate, the first and second guide plates each having a protrusion protruding from the third guide plate toward the downstream side in a wire feed direction of the wire fed by the wire feed section in a direction in which the wire is curled by the curl guide, the protrusion having a length longer than the diameter of one wire and protruding from the third guide plate toward the downstream side in a wire feed direction of the wire fed by the wire feed section in a direction in which the wire is curled by the curl guide, and the retraction guide section is provided between the protrusions on the radial outside of a loop formed by the wire to be curled by the curl guide. The first and second guide plates are inclined in a direction such that the protrusions protrude radially outward from the third guide plate in the loop formed by the wire. It is a binding machine.

[0009] In the present invention, when the wire is fed through the curl guide with an obstacle positioned to block the wire feed path, the wire that comes into contact with the obstacle retreats through the retreat guide portion. Effect of the Invention

[0010] In the present invention, even if there is an obstacle in a position that blocks the wire feed path with respect to the curl guide, the wire can be fed, the occurrence of buckling, etc. is suppressed, and even if a feeding failure occurs, the wire can be easily removed. Therefore, the occurrence of obstacles due to a wire feeding failure can be suppressed. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a side view showing an example of the overall configuration of a reinforcing bar binding machine. [Diagram 2] FIG. 2 is a side view showing an example of a configuration of a main part of a reinforcing bar binding machine. [Diagram 3] FIG. 2 is a partially cutaway perspective view showing an example of a main configuration of a reinforcing bar binding machine. [Figure 4A] FIG. 1 is a front view showing an example of the overall configuration of a reinforcing bar binding machine. [Figure 4B] 3 is a cross-sectional view taken along line AA in FIG. 2. [Diagram 5] FIG. 2 is an external side view of the reinforcing bar binding machine. [Figure 6] FIG. 2 is a top view showing the appearance of the rebar binding machine. [Figure 7] FIG. 2 is a front view of the exterior of the reinforcing bar binding machine. [Figure 8A] FIG. 4 is a front view showing an example of a wire feeding section. [Figure 8B] FIG. 4 is a plan view showing an example of a wire feeding section. [Figure 9A] FIG. 2 is a plan view showing the induction guide according to the first embodiment. [Figure 9B] FIG. 2 is a perspective view showing an induction guide according to the first embodiment. [Figure 9C] FIG. 2 is a front view showing the induction guide according to the first embodiment. [Figure 9D] FIG. 2 is a side view showing the induction guide according to the first embodiment. [Figure 9E] 9B is a cross-sectional view taken along line BB in FIG. 9A. [Figure 9F] 9D is a cross-sectional view taken along line DD in FIG. 9D. [Figure 9G]FIG. 2 is a cutaway perspective view showing the induction guide according to the first embodiment. [Figure 10A] FIG. 4 is a plan cross-sectional view showing an example of a binding section and a driving section. [Figure 10B] FIG. 4 is a plan cross-sectional view showing an example of a binding section and a driving section. [Figure 10C] FIG. 4 is a side cross-sectional view showing an example of a binding section and a driving section. [Figure 11A] 10 is an explanatory diagram showing an example of an operation for bundling reinforcing bars with a wire. FIG. [Figure 11B] 10 is an explanatory diagram showing an example of an operation for bundling reinforcing bars with a wire. FIG. [Figure 11C] 10 is an explanatory diagram showing an example of an operation for bundling reinforcing bars with a wire. FIG. [Figure 11D] 10 is an explanatory diagram showing an example of an operation for bundling reinforcing bars with a wire. FIG. [Figure 11E] 10 is an explanatory diagram showing an example of an operation for bundling reinforcing bars with a wire. FIG. [Figure 12A] FIG. 4 is an explanatory diagram showing the movement of a wire in the induction guide according to the first embodiment. [Figure 12B] FIG. 4 is an explanatory diagram showing the movement of a wire in the induction guide according to the first embodiment. [Figure 12C] FIG. 4 is an explanatory diagram showing the movement of a wire in the induction guide according to the first embodiment. [Figure 13A] 10A and 10B are explanatory diagrams showing a state in which the wire is locked by the locking member; [Figure 13B] 10A and 10B are explanatory diagrams showing a state in which the wire is locked by the locking member; [Figure 13C] 10A and 10B are explanatory diagrams showing a state in which the wire is locked by the locking member; [Figure 14A] 11A and 11B are explanatory diagrams showing the movement of the wire in the feed restricting portion. [Figure 14B] 11A and 11B are explanatory diagrams showing the movement of the wire in the feed restricting portion. [Figure 15A] FIG. 2 is a perspective view showing a main part of the curl guide according to the first embodiment. [Figure 15B] FIG. 2 is an exploded perspective view of a main part showing the curl guide of the first embodiment. [Figure 15C] FIG. 2 is a side view showing a main part of the curl guide according to the first embodiment. [Figure 15D] 1 is an exploded side view showing a main part of a curl guide according to a first embodiment. FIG. [Figure 16A] FIG. 11 is a perspective view showing a main part of a curl guide according to a second embodiment. [Figure 16B] FIG. 11 is an exploded perspective view of a main part showing a curl guide according to a second embodiment. [Figure 16C] FIG. 11 is a side view of a main portion showing a curl guide according to a second embodiment. [Figure 16D] FIG. 11 is an exploded side view showing a main part of a curl guide according to a second embodiment. [Figure 17A] FIG. 11 is a perspective view showing a main part of a curl guide according to a third embodiment. [Figure 17B] FIG. 11 is an exploded perspective view of a main part showing a curl guide according to a third embodiment. [Figure 17C] FIG. 13 is a side view showing a main part of a curl guide according to a third embodiment. [Figure 17D] FIG. 11 is an exploded side view of a main part showing a curl guide according to a third embodiment. [Figure 18] FIG. 13 is an exploded side view of a main part showing a curl guide according to a fourth embodiment. [Figure 19] FIG. 13 is an exploded side view of a main part showing a curl guide according to a fifth embodiment. [Figure 20] 11 is an explanatory diagram showing the operation of removing the reinforcing bar from the curl forming portion. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an example of a reinforcing bar binding machine as an embodiment of the binding machine of the present invention will be described with reference to the drawings.

[0013] <Example of rebar binding machine configuration> Fig. 1 is a configuration diagram seen from the side showing an example of the overall configuration of a reinforcing bar binding machine, Fig. 2 is a configuration diagram seen from the side showing an example of the main configuration of a reinforcing bar binding machine, Fig. 3 is a partially cutaway perspective view showing an example of the main configuration of a reinforcing bar binding machine, Fig. 4A is a configuration diagram seen from the front showing an example of the overall configuration of a reinforcing bar binding machine, and Fig. 4B is a cross-sectional view taken along line AA in Fig. 2. Fig. 5 is an external side view of the reinforcing bar binding machine, Fig. 6 is an external top view of the reinforcing bar binding machine, and Fig. 7 is an external front view of the reinforcing bar binding machine.

[0014] The rebar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F, winding it around the rebar S to be bound, and then feeds the wire W wound around the rebar S in the reverse direction indicated by the arrow R to wind it around the rebar S. The wire W is then twisted and the rebar S is bound with the wire W.

[0015] To achieve the above-mentioned functions, the rebar tying machine 1A is equipped with a magazine 2A that stores the wire W, and a wire feed unit 3A that feeds the wire W. The rebar tying machine 1A also includes a first wire guide 4A1 that guides the wire W drawn into the wire feed unit 3A during the operation of feeding the wire W in the forward direction by the wire feed unit 3A, and a second wire guide 4A2 that guides the wire W fed out from the wire feed unit 3A.

[0016] Furthermore, the reinforcing bar binding machine 1A is equipped with a curl forming unit 5A that forms a path for winding the wire W fed by the wire feeding unit 3A around the reinforcing bar S. The reinforcing bar binding machine 1A also includes a cutting unit 6A that cuts the wire W wound around the reinforcing bar S by feeding the wire W in the reverse direction by the wire feeding unit 3A, a binding unit 7A that twists the wire W wound around the reinforcing bar S, and a drive unit 8A that drives the binding unit 7A.

[0017] The magazine 2A is an example of a storage section, and rotatably and detachably stores a reel 20 around which a long wire W is wound so as to be able to be unwound. The wire W is a wire made of a metal wire capable of plastic deformation, a wire made of a metal wire coated with resin, or a twisted wire.

[0018] The reel 20 includes a cylindrical hub portion 21 around which the wire W is wound, and a pair of flange portions 22, 23 integrally provided on both axial ends of the hub portion 21. The flange portions 22, 23 are substantially disk-shaped with a larger diameter than the hub portion 21, and are provided concentrically with the hub portion 21. The reel 20 has two wires W wound around the hub portion 21, and is configured so that the two wires W can be pulled out from the reel 20 at the same time.

[0019] 4A and 4B, the reel 20 is attached to the magazine 2A in a state where it is offset in one direction with respect to the feed path FL of the wire W defined by the first wire guide 4A1 and the second wire guide 4A2 along the axial direction of the reel 20 that is along the axial direction of the hub portion 21. In this example, the entire hub portion 21 of the reel 20 is offset in one direction with respect to the feed path FL of the wire W.

[0020] Fig. 8A is a front view showing an example of the wire feeding unit, and Fig. 8B is a plan view showing an example of the wire feeding unit. Next, the configuration of the wire feeding unit 3A will be described. The wire feeding unit 3A includes a first feed gear 30L and a second feed gear 30R that feed the wires W by rotating as a pair of feed members that clamp and feed two parallel wires W.

[0021] The first feed gear 30L has teeth 31L for transmitting a driving force. In this example, the teeth 31L have a shape constituting a spur gear, and are formed on the entire circumference of the first feed gear 30L. The first feed gear 30L also has a groove 32L into which the wire W is inserted. In this example, the groove 32L is formed as a recess having a substantially V-shaped cross section, and is formed along the circumferential direction on the entire circumference of the first feed gear 30L.

[0022] The second feed gear 30R has teeth 31R for transmitting a driving force. In this example, the teeth 31R have a shape constituting a spur gear, and are formed on the entire circumference of the second feed gear 30R. The second feed gear 30R also has a groove 32R into which the wire W is inserted. In this example, the groove 32R is formed as a recess having a substantially V-shaped cross section, and is formed along the circumferential direction on the entire circumference of the second feed gear 30R.

[0023] In the wire feed section 3A, the groove 32L of the first feed gear 30L and the groove 32R of the second feed gear 30R are opposed to each other, and the first feed gear 30L and the second feed gear 30R are provided with a feed path FL of the wire W defined by the first wire guide 4A1 and the second wire guide 4A2 between them. The feed path FL of the wire W is the widthwise center position of the wire feed section 3A formed by the pair of the first feed gear 30L and the second feed gear 30R. As shown in FIG. 4B etc., the reel 20 is disposed in a state offset in one direction with respect to the widthwise center position of the wire feed section 3A.

[0024] The wire feed section 3A is configured so that the first feed gear 30L and the second feed gear 30R can be displaced in a direction toward and away from each other. In this example, the second feed gear 30R is displaced relative to the first feed gear 30L.

[0025] Thus, the first feed gear 30L is rotatably supported by a shaft 300L relative to a support member 301 of the wire feed unit 3A. The wire feed unit 3A also includes a first displacement member 36 that displaces the second feed gear 30R in a direction toward and away from the first feed gear 30L. One end of the first displacement member 36 rotatably supports the second feed gear 30R by the shaft 300R. The other end of the first displacement member 36 is rotatably supported by the support member 301 with the shaft 36a as a fulcrum.

[0026] The wire feeding unit 3A includes a second displacement member 37 that displaces the first displacement member 36. The first displacement member 36 is connected to one end of the second displacement member 37. A spring 38 is connected to the other end of the second displacement member 37. Furthermore, the second displacement member 37 is rotatably supported by a support member 301 with a shaft 37a as a fulcrum between the one end and the other end.

[0027] The first displacement member 36 is pressed by the spring 38 via the second displacement member 37, and is displaced in the direction of the arrow V1 by rotation about the shaft 36a as a fulcrum. As a result, the second feed gear 30R is pressed by the force of the spring 38 in the direction of the first feed gear 30L.

[0028] When two wires W are loaded between the first feed gear 30L and the second feed gear 30R, one wire W enters the groove portion 32L of the first feed gear 30L and the other wire W enters the groove portion 32R of the second feed gear 30R, and the wires W are clamped between the groove portion 32L of the first feed gear 30L and the groove portion 32R of the second feed gear 30R.

[0029] In the wire feed section 3A, the teeth 31L of the first feed gear 30L mesh with the teeth 31R of the second feed gear 30R in a state where the wire W is sandwiched between the groove 32L of the first feed gear 30L and the groove 32R of the second feed gear 30R. This allows a driving force due to rotation to be transmitted between the first feed gear 30L and the second feed gear 30R.

[0030] In the wire feeding section 3A in this example, the first feed gear 30L is on the driving side, and the second feed gear 30R is on the driven side.

[0031] The first feed gear 30L rotates by the rotation of a feed motor (not shown). The second feed gear 30R rotates by the rotation of the first feed gear 30L transmitted by the meshing of the teeth 31L and the teeth 31R.

[0032] As a result, the wire feeding unit 3A feeds the wire W clamped between the first feed gear 30L and the second feed gear 30R along the extension direction of the wire W. In the configuration for feeding two wires W, the two wires W are fed in a parallel state due to a frictional force generated between the groove 32L of the first feed gear 30L and one wire W, a frictional force generated between the groove 32R of the second feed gear 30R and the other wire W, and a frictional force generated between the one wire W and the other wire W.

[0033] In the wire feed unit 3A, the rotation direction of the first feed gear 30L and the second feed gear 30R is switched between forward and reverse by switching the rotation direction of a feed motor (not shown) between forward and reverse, thereby switching the feed direction of the wire W between forward and reverse.

[0034] Next, a description will be given of the wire guides that guide the feeding of the wire W. As shown in Fig. 4B, the first wire guide 4A1 is disposed upstream of the first feed gear 30L and the second feed gear 30R with respect to the feeding direction of the wire W fed in the forward direction. The second wire guide 4A2 is disposed downstream of the first feed gear 30L and the second feed gear 30R with respect to the feeding direction of the wire W fed in the forward direction.

[0035] The first wire guide 4A1 and the second wire guide 4A2 have a guide hole 40A through which the wire W passes. In the reinforcing bar binding machine 1A, the path of the wire W fed by the wire feeding unit 3A is regulated by the curl forming unit 5A, so that the trajectory of the wire W becomes a loop Ru as shown by the dashed line in FIG.

[0036] When the direction intersecting the radial direction of the loop Ru formed by this wire W is defined as the axial direction, the guide holes 40A of the first wire guide 4A1 and the second wire guide 4A2 are configured in a shape that passes two wires W in parallel along the axial direction of the loop Ru. The direction in which the two wires W are parallel to each other is also the direction in which the first feed gear 30L and the second feed gear 30R are aligned.

[0037] The first wire guide 4A1 and the second wire guide 4A2 are provided with a guide hole 40A on a feed path FL of the wire W passing between the first feed gear 30L and the second feed gear 30R. The first wire guide 4A1 guides the wire W passing through the guide hole 40A to the feed path FL between the first feed gear 30L and the second feed gear 30R.

[0038] The first wire guide 4A1 and the second wire guide 4A2 have a wire introduction portion on the upstream side of the guide hole 40A with respect to the feeding direction of the wire W fed in the forward direction, which is tapered such as in a conical or pyramidal shape with a larger opening area than the downstream side. This makes it easy to introduce the wire W into the first wire guide 4A1 and the second wire guide 4A2.

[0039] Next, a description will be given of the curl forming unit 5A which constitutes a feed path for the wire W that winds the wire W around the reinforcing bar S. The curl forming unit 5A includes a curl guide 50 which imparts a curl to the wire W fed by the first feed gear 30L and the second feed gear 30R, and an induction guide 51A which guides the wire W having been curled by the curl guide 50 to the bundling unit 7A.

[0040] The curl guide 50 includes a guide groove 52 that constitutes a feed path for the wire W, and a first guide pin 53a, a second guide pin 53b, and a third guide pin 53c that act as guide members for curling the wire W in cooperation with the guide groove 52. The curl guide 50 is configured by stacking guide plates 50L, 50C, and 50R, with guide plate 50C forming the guide surface of guide groove 52. In addition, the guide plates 50L and 50R form side wall surfaces that stand upright from the guide surface of guide groove 52.

[0041] The first guide pin 53a is provided on the introduction side of the wire W fed in the forward direction by the first feed gear 30L and the second feed gear 30R in the curl guide 50. The first guide pin 53a is disposed radially inside the loop Ru formed by the wire W with respect to the feed path of the wire W defined by the guide groove 52. The first guide pin 53a regulates the feed path of the wire W so that the wire W fed along the guide groove 52 does not enter the radial inside of the loop Ru formed by the wire W.

[0042] The second guide pin 53b is provided between the first guide pin 53a and the third guide pin 53c. The second guide pin 53b is disposed radially outward of the loop Ru formed by the wire W with respect to the feed path of the wire W by the guide groove 52. A portion of the circumferential surface of the second guide pin 53b protrudes from the guide groove 52. As a result, the wire W guided by the guide groove 52 comes into contact with the second guide pin 53b at the portion where the second guide pin 53b is provided.

[0043] The third guide pin 53c is provided on the discharge side of the wire W fed in the forward direction by the first feed gear 30L and the second feed gear 30R in the curl guide 50. The third guide pin 53c is disposed radially outside the loop Ru formed by the wire W with respect to the feed path of the wire W by the guide groove 52. A portion of the circumferential surface of the third guide pin 53c protrudes from the guide groove 52. As a result, the wire W guided by the guide groove 52 comes into contact with the third guide pin 53c at the portion where the third guide pin 53c is provided.

[0044] The curl forming unit 5A includes a retraction mechanism 53 that retracts the first guide pin 53a. The retraction mechanism 53 moves the first guide pin 53a laterally along the axial direction of the first guide pin 53a, thereby retracting the first guide pin 53a from the path along which the wire W wound around the reinforcing bar S moves by the operation of feeding the wire W in the opposite direction by the first feed gear 30L and the second feed gear 30R.

[0045] Next, a description will be given of the action of imparting a curl to the wire W. The wire W is fed in the forward direction by the first feed gear 30L and the second feed gear 30R, and the radial position of the loop Ru formed by the wire W is restricted at at least three points, namely, two points on the outer side in the radial direction of the loop Ru formed by the wire W and one point on the inner side between these two points, so that the wire W is imparted with a loop-like curl.

[0046] In this example, the radial outer position of the loop Ru formed by the wire W is regulated by two points, the second wire guide 4A2 provided upstream of the first guide pin 53a and the third guide pin 53c provided downstream of the first guide pin 53a, with respect to the feed direction of the wire W fed in the forward direction. In addition, the radial inner position of the loop Ru formed by the wire W is regulated by the first guide pin 53a. This causes the wire W fed in the forward direction by the first feed gear 30L and the second feed gear 30R to have a loop-shaped curl.

[0047] In addition, by providing a second guide pin 53b in the guide groove 52 at a position radially outside the loop Ru formed by the wire W, where the wire W fed to the third guide pin 53c makes contact, wear of the guide groove 52 can be prevented.

[0048] Fig. 9A is a plan view showing the guide of the first embodiment, Fig. 9B is a perspective view showing the guide of the first embodiment, Fig. 9C is a front view showing the guide of the first embodiment, Fig. 9D is a side view showing the guide of the first embodiment, Fig. 9E is a cross-sectional view taken along line BB in Fig. 9A, Fig. 9F is a cross-sectional view taken along line DD in Fig. 9D, and Fig. 9G is a cutaway perspective view showing the guide of the first embodiment.

[0049] Next, the guide 51A of the first embodiment will be described. As shown in Fig. 4A, the guide 51A is provided at a position offset in a direction opposite to the one direction in which the reel 20 is offset with respect to a feed path FL of the wire W defined by the first wire guide 4A1 and the second wire guide 4A2.

[0050] The induction guide 51A includes a first guide portion 55 that regulates the axial position of the loop Ru formed by the wire W that has been curled by the curl guide 50, and a second guide portion 57 that regulates the radial position of the loop Ru formed by the wire W.

[0051] The first guide portion 55 is provided on the side where the wire W curled by the curl guide 50 is introduced relative to the second guide portion 57. The first guide portion 55 has a side surface portion 55L on one side, which is the side in one direction in which the reel 20 is offset. The first guide portion 55 also has a side surface portion 55R facing the side surface portion 55L on the other side, which is the side in the opposite direction to the one direction in which the reel 20 is offset. Furthermore, the first guide portion 55 has a side surface portion 55L standing on one side and a side surface portion 55R standing on the other side, and a bottom surface portion 55D connecting the side surface portion 55L and the side surface portion 55R.

[0052] The second guide portion 57 includes a guide surface 57a extending radially outward of the loop Ru formed by the wire W along the feeding direction of the wire W toward the bundling portion 7A.

[0053] One side surface portion 55L of the first guide portion 55 includes a first guide portion 55L1 that guides the wire W to the guide surface 57a of the second guide portion 57, and a second guide portion 55L2 that guides the wire W along the guide surface 57a.

[0054] The other side portion 55R of the first guide portion 55 includes a third guide portion 55R1 that guides the wire W to the guide surface 57a of the second guide portion 57, and a fourth guide portion 55R2 that guides the wire W along the guide surface 57a.

[0055] In the induction guide 51A, a focusing passage 55S is formed in a space surrounded by a pair of side surfaces 55L, 55R and a bottom surface 55D. In addition, the induction guide 51A is formed with an open end 55E1 through which the wire W enters the focusing passage 55S. The open end 55E1 is an end of the first guide portion 55 on the side away from the second guide portion 57, and opens in the space surrounded by the pair of side surfaces 55L, 55R and the bottom surface 55D.

[0056] In the first guide portion 55, the distance between the first guiding portion 55L1 and the third guiding portion 55R1 becomes narrower from the opening end 55E1 toward the guide surface 57a of the second guide portion 57. As a result, in the first guide portion 55, the distance between the first guiding portion 55L1 and the third guiding portion 55R1 is widest between the opening end 55EL1 of the first guiding portion 55L1 located at the opening end 55E1 and the opening end 55ER1 of the third guiding portion 55R1.

[0057] In addition, in the first guide portion 55, the second guide portion 55L2 connected to the first guide portion 55L1 is located on one side of the guide surface 57a of the second guide portion 57, and the fourth guide portion 55R2 connected to the third guide portion 55R1 is located on the other side of the guide surface 57a. The second guide portion 55L2 and the fourth guide portion 55R2 face each other in parallel with a predetermined gap therebetween that is equal to or greater than the radial width of the two parallel wires W.

[0058] As a result, the interval between the first induction portion 55L1 and the third induction portion 55R1 is narrowest at a portion where the first induction portion 55L1 is connected to the second induction portion 55L2 and the third induction portion 55R1 is connected to the fourth induction portion 55R2. Therefore, the portion where the first induction portion 55L1 and the second induction portion 55L2 are connected is the narrowest portion 55EL2 of the first induction portion 55L1 with respect to the third induction portion 55R1. Also, the portion where the third induction portion 55R1 and the fourth induction portion 55R2 are connected is the narrowest portion 55ER2 of the third induction portion 55R1 with respect to the first induction portion 55L1.

[0059] As a result, in the induction guide 51A, a portion between the narrowest portion 55EL2 of the first induction section 55L1 and the narrowest portion 55ER2 of the third induction section 55R1 becomes the narrowest portion 55E2 of the focusing passage 55S. In the induction guide 51A, the cross-sectional area of ​​the focusing passage 55S gradually narrows from the open end 55E1 toward the narrowest portion 55E2 along the wire W entry direction.

[0060] The induction guide 51A includes an entrance angle regulating portion 56A that changes the entrance angle of the wire W entering the converging passage 55S so as to face the narrowest portion 55E2.

[0061] In the reinforcing bar binding machine 1A, the reel 20 is disposed offset in one direction. The wire W, which is fed from the reel 20 offset in this one direction by the wire feed unit 3A and curled by the curl guide 50, heads in another direction opposite to the one direction in which the reel 20 is offset.

[0062] Therefore, the wire W entering the focusing passage 55S between the side surface portion 55L and the side surface portion 55R of the first guide portion 55 first enters toward the third guide portion 55R1 of the side surface portion 55R. The tip of the wire W entering toward the third guide portion 55R1 of the side surface portion 55R is directed toward the narrowest portion 55EL2 of the first guide portion 55L1 and the narrowest portion 55ER2 of the third guide portion 55R1, that is, toward the narrowest portion 55E2 of the focusing passage 55S. Therefore, the first guide portion 55L1 of the side surface portion 55L facing the side surface portion 55R is provided with an entrance angle regulating portion 56A.

[0063] The approach angle regulating portion 56A is provided at a position protruding inward of the imaginary line 55EL3 on the side surface portion 55R side from the imaginary line 55EL3 connecting the opening end 55EL1 and the narrowest portion 55EL2 of the focusing passage 55S, which is the imaginary line 55EL3 connecting the opening end 55EL1 and the narrowest portion 55EL2 of the first guiding portion 55L1 in this example. In this example, the approach angle regulating portion 56A is configured so that the vicinity of the middle between the opening end 55EL1 and the narrowest portion 55EL2 in the first guiding portion 55L1 is convex toward the third guiding portion 55R1. As a result, the first guiding portion 55L1 has a bent shape in the plan view shown in FIG. 9A.

[0064] The wire curled by the curl guide 50 is introduced between a pair of side portions 55L, 55R of the first guide portion 55. The induction guide 51A regulates the axial position of the loop Ru formed by the wire W by the first induction portion 55L1 and the third induction portion 55R1 of the first guide portion 55, and guides the loop Ru to the guide surface 57a of the second guide portion 57.

[0065] In addition, the induction guide 51A regulates the axial position of the loop Ru formed by the wire W guided to the guide surface 57a of the second guide portion 57 by the second induction portion 55L2 and the fourth induction portion 55R2 of the first guide portion 55, and regulates the radial position of the loop Ru formed by the wire W by the guide surface 57a of the second guide portion 57.

[0066] In this example, the second guide portion 57 of the induction guide 51A is fixed to the main body portion 10A of the reinforcing bar binding machine 1A, and the first guide portion 55 is fixed to the second guide portion 57. The first guide portion 55 may be supported by the second guide portion 57 in a state in which it can rotate about the shaft 55b as a fulcrum. In this configuration, the first guide portion 55 is configured to be openable and closable in a direction approaching and separating from the curl guide 50 while the opening end 55E1 side is biased by a spring (not shown) in a direction approaching the curl guide 50. This makes it easy to remove the reinforcing bar binding machine 1A from the reinforcing bar S by retracting the first guide portion 55 after binding the reinforcing bar S with the wire W.

[0067] Next, the cutting unit 6A that cuts the wire W wound around the reinforcing bar S will be described. The cutting unit 6A includes a fixed blade unit 60, a movable blade unit 61 that cuts the wire W in cooperation with the fixed blade unit 60, and a transmission mechanism 62 that transmits the operation of the binding unit 7A to the movable blade unit 61. The fixed blade unit 60 includes an opening 60a through which the wire W passes, and is configured by providing an edge portion in the opening 60a that can cut the wire W.

[0068] The movable blade unit 61 cuts the wire W passing through the opening 60a of the fixed blade unit 60 by rotating around the fixed blade unit 60 as a fulcrum axis. The transmission mechanism 62 transmits the operation of the binding unit 7A to the movable blade unit 61, and rotates the movable blade unit 61 in conjunction with the operation of the binding unit 7A to cut the wire W.

[0069] The fixed blade portion 60 is provided downstream of the second wire guide 4A2 with respect to the feeding direction of the wire W fed in the forward direction, and the opening 60a constitutes the wire guide.

[0070] Figures 10A and 10B are plan cross-sectional views showing an example of a binding unit and a driving unit, and Figure 10C is a side cross-sectional view showing an example of a binding unit and a driving unit. Next, we will explain the binding unit 7A that binds the reinforcing bar S with wire W, and the driving unit 8A that drives the binding unit 7A.

[0071] The bundling portion 7A includes a locking member 70 to which the wire W is locked, an operating member 71 for opening and closing the locking member 70, and a rotating shaft 72 for operating the locking member 70 and the operating member 71.

[0072] The locking member 70 includes a first movable locking member 70L, a second movable locking member 70R, and a fixed locking member 70C. The tip side of the first movable locking member 70L is located on one side relative to the fixed locking member 70C, and the tip side of the second movable locking member 70R is located on the other side relative to the fixed locking member 70C.

[0073] The rear ends of the first movable locking member 70L and the second movable locking member 70R of the locking member 70 are rotatably supported by the fixed locking member 70C via a shaft 76. This allows the locking member 70 to open and close in a direction in which the tip side of the first movable locking member 70L moves toward and away from the fixed locking member 70C by rotating about the shaft 76. Also, the tip side of the second movable locking member 70R opens and closes in a direction in which it moves toward and away from the fixed locking member 70C.

[0074] The actuating member 71 and the rotating shaft 72 convert the rotational movement of the rotating shaft 72 into the forward and backward movement of the actuating member 71 along the axial direction of the rotating shaft 72, as indicated by arrows A1 and A2, by a threaded portion provided on the outer periphery of the rotating shaft 72 and a nut portion provided on the inner periphery of the actuating member 71. The actuating member 71 is provided with an opening / closing pin 71a that opens and closes the first movable locking member 70L and the second movable locking member 70R.

[0075] The opening / closing pin 71a is inserted into an opening / closing guide hole 73 provided in the first movable locking member 70L and the second movable locking member 70R. The opening / closing guide hole 73 extends along the moving direction of the operating member 71 and has a shape that converts the linear movement of the opening / closing pin 71a, which moves in conjunction with the operating member 71, into an opening / closing operation caused by the rotation of the first movable locking member 70L and the second movable locking member 70R about a shaft 76. Note that although Figs. 10A and 10B show the opening / closing guide hole 73 provided in the first movable locking member 70L, a similar opening / closing guide hole 73 with a symmetrical shape is also provided in the second movable locking member 70R.

[0076] In the binding part 7A, the side where the locking member 70 is provided is the front side, and the side where the operating member 71 is provided is the rear side. When the operating member 71 moves in the rear direction indicated by the arrow A2, the first movable locking member 70L and the second movable locking member 70R move in a direction away from the fixed locking member 70C by a rotational motion about the shaft 76 as a fulcrum, as shown in FIG. 10A, due to the trajectory of the opening / closing pin 71a and the shape of the opening / closing guide hole 73.

[0077] As a result, the first movable locking member 70L and the second movable locking member 70A open relative to the fixed locking member 70C, and a feed path through which the wire W passes is formed between the first movable locking member 70L and the fixed locking member 70C, and between the second movable locking member 70R and the fixed locking member 70C.

[0078] When the first movable locking member 70L and the second movable locking member 70R are open relative to the fixed locking member 70C, the wire W fed by the first feed gear 30L and the second feed gear 30R is guided by the first wire guide 4A1 and the second wire guide 4A2 and passes between the fixed locking member 70C and the first movable locking member 70L. The wire W passing between the fixed locking member 70C and the first movable locking member 70L is guided to the curl forming section 5A. The wire W, which is curled by the curl forming section 5A and guided to the bundling section 7A, passes between the fixed locking member 70C and the second movable locking member 70R.

[0079] In the locking member 70, as the operating member 71 moves in the forward direction indicated by the arrow A1, the first movable locking member 70L and the second movable locking member 70R move in a direction approaching the fixed locking member 70C by a rotational motion about the shaft 76 as a fulcrum, as shown in Fig. 10B, 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 movable locking member 70L and the second movable locking member 70A close to the fixed locking member 70C.

[0080] When the first movable locking member 70L closes relative to the fixed locking member 70C, the wire W sandwiched between the first movable locking member 70L and the fixed locking member 70C is locked in a manner that allows the wire W to move between the first movable locking member 70L and the fixed locking member 70C. When the second movable locking member 70R closes relative to the fixed locking member 70C, the wire W sandwiched between the second movable locking member 70R and the fixed locking member 70C is locked in a manner that prevents the wire W from slipping out from between the second movable locking member 70R and the fixed locking member 70C.

[0081] The actuating member 71 has a bending portion 71b1 that pushes the tip WS side, which is one end of the wire W, in a predetermined direction to bend it, and a bending portion 71b2 that pushes the terminal end (WE) side, which is the other end of the wire W cut at the cutting portion 6A, in a predetermined direction to bend it.

[0082] The operating member 71, by moving forward as indicated by arrow A1, pushes the tip WS side of the wire W locked by the fixed locking member 70C and the second movable locking member 70R with the bending portion 71b1, bending it toward the reinforcing bar S. In addition, the operating member 71, by moving forward as indicated by arrow A1, pushes the end (WE) side of the wire W locked by the fixed locking member 70C and the first movable locking member 70L and cut by the cutting portion 6A with the bending portion 71b2, bending it toward the reinforcing bar S.

[0083] The binding section 7A includes a rotation restricting section 74 that restricts the rotation of the locking member 70 and the operating member 71 in conjunction with the rotational movement of the rotating shaft 72. The rotation restricting section 74 is provided on the operating member 71. The rotation restricting section 74 is locked to a locking section (not shown) in a movement range in which the locking member 70 locks the wire W to a movement range in which the bending sections 71b1 and 71b2 of the operating member 71 bend the wire W. This restricts the rotation of the operating member 71 in conjunction with the rotation of the rotating shaft 72, and the operating member 71 moves in the front-rear direction due to the rotational movement of the rotating shaft 72. In addition, in a movement range in which the wire W locked by the locking member 70 is twisted, the rotation restricting section 74 is released from the locking section (not shown) and rotates the operating member 71 in conjunction with the rotation of the rotating shaft 72. In the locking member 70, the fixed locking member 70C, which locks the wire W, the first movable locking member 70L, and the second movable locking member 70R rotate in conjunction with the rotation of the operating member 71.

[0084] The driving unit 8A includes a motor 80 and a reducer 81 that reduces speed and amplifies torque. In the binding unit 7A and the driving unit 8A, the rotating shaft 72 and the motor 80 are connected via the reducer 81, and the rotating shaft 72 is driven by the motor 80 via the reducer 81.

[0085] The retraction mechanism 53 for the first guide pin 53a is configured with a link mechanism that converts the movement of the actuating member 71 in the front-rear direction into the displacement of the first guide pin 53a. The transmission mechanism 62 for the movable blade 61 is configured with a link mechanism that converts the movement of the actuating member 71 in the front-rear direction into the rotational motion of the movable blade 61.

[0086] Next, a description will be given of the feed restricting portion 9A that restricts the feed of the wire W. The feed restricting portion 9A is configured by providing a member against which the tip WS of the wire W abuts, in the feed path of the wire W passing between the fixed locking member 70C and the second movable locking member 70R. As shown in Figs. 3 and 4B, in this example, the feed restricting portion 9A is configured integrally with the guide plate 50R that constitutes the curl guide 50, and protrudes from the guide plate 50R in a direction intersecting the feed path of the wire W.

[0087] The feed restricting portion 9A includes a parallel restricting portion 90 that guides the parallel direction of the wires W. The parallel restricting portion 90 is configured by providing a recess on a surface of the feed restricting portion 9A that comes into contact with the wire W, the recess extending in a direction intersecting the parallel direction of the two wires W restricted by the first wire guide 4A1 and the second wire guide 4A2.

[0088] Next, the shape of the reinforcing bar binding machine 1A will be described. The reinforcing bar binding machine 1A is in a form that is held by the worker and used, and includes a main body 10A and a handle 11A. In the reinforcing bar binding machine 1A, the curl guide 50 and the induction guide 51A of the curl forming unit 5A described above are provided at the front end of the main body 10A. In addition, in the reinforcing bar binding machine 1A, the handle 11A extends downward from the main body 10A. Furthermore, a battery 15A is detachably attached to the lower part of the handle 11A. In addition, in the reinforcing bar binding machine 1A, the magazine 2A is provided in front of the handle 11A. In the reinforcing bar binding machine 1A, the wire feed unit 3A, the cutting unit 6A, the binding unit 7A, the drive unit 8A that drives the binding unit 7A, and the like are stored in the main body 10A.

[0089] Next, the operation section of the rebar binding machine 1A will be described. The rebar binding machine 1A has a trigger 12A provided on the front side of a handle section 11A, and a switch 13A provided inside the handle section 11A. In the rebar binding machine 1A, a control section 14A controls a motor 80 and a feed motor (not shown) according to the state of the switch 13A pressed by operating the trigger 12A.

[0090] <Example of rebar binding machine operation> 11A to 11E are operation explanatory diagrams showing an example of the operation of binding a reinforcing bar with a wire. Next, the operation of binding a reinforcing bar S with two wires W by the reinforcing bar binding machine 1A will be described with reference to each drawing.

[0091] The rebar binding machine 1A is in a standby state in which two wires W are clamped between the first feed gear 30L and the second feed gear 30R, and the tips WS of the wires W are moved from the clamping position between the first feed gear 30L and the second feed gear 30R to a position between the fixed blade portion 60 of the cutting section 6A. In addition, in the standby state, the rebar binding machine 1A is in a state in which the first movable locking member 70L is open relative to the fixed locking member 70C, and the second movable locking member 70R is open relative to the fixed locking member 70C, as shown in Fig. 10A.

[0092] When the reinforcing bar S is inserted between the curl guide 50 and the induction guide 51A of the curl forming unit 5A and the trigger 12A is operated, the feed motor (not shown) is driven in the forward rotation direction, the first feed gear 30L rotates forward, and the second feed gear 30R rotates forward following the first feed gear 30L. As a result, the two wires W held between the first feed gear 30L and the second feed gear 30R are fed in the forward direction indicated by the arrow F.

[0093] A first wire guide 4A1 is provided upstream of the wire feed section 3A and a second wire guide 4A2 is provided downstream of the wire feed section 3A in relation to the feed direction of the wire W, which is fed in the forward direction by the wire feed section 3A, so that the two wires W are fed in parallel along the axial direction of the loop Ru formed by the wires W.

[0094] When the wire W is fed in the forward direction, it passes between the fixed locking member 70C and the first movable locking member 70L, and passes through the guide groove 52 of the curl guide 50 of the curl forming unit 5A. As a result, the wire W is given a curling tendency to be wound around the reinforcing bar S at three points: the second wire guide 4A2, the first guide pin 53a and the third guide pin 53c of the curl guide 50, and further at the second guide pin 53b upstream of the third guide pin 53c.

[0095] The wire W having been curled by the curl guide 50 is guided by the first guide portion 55 of the guide 51A to the second guide portion 57. As shown in FIG. 11A, the tip WS of the wire W guided to the second guide portion 57 comes into contact with the guide surface 57a of the second guide portion 57. The wire W having been curled by the curl guide 50 is further fed in the forward direction by the wire feed portion 3A, and is guided by the guide 51A to between the fixed locking member 70C and the second movable locking member 70R. The wire W is then fed until the tip WS hits the feed restricting portion 9A. When the tip WS of the wire W is fed to a position where it hits the feed restricting portion 9A, the drive of the feed motor (not shown) is stopped.

[0096] In addition, since there is a slight time lag between when the tip WS of the wire W comes into contact with the feed regulating portion 9A and when the driving of the wire feed portion 3A is stopped, as shown in FIG. 11B, the loop Ru formed by the wire W bends in a radially expanding direction to the extent that it comes into contact with the bottom portion 55D of the first guide portion 55 of the induction guide 51A.

[0097] After the forward feed of the wire W is stopped, the motor 80 is driven in the forward rotation direction. The rotation of the rotating shaft 72 of the operating member 71, which is linked to the rotation of the motor 80, is restricted by the rotation restricting portion 74, and the rotation of the motor 80 is converted into linear movement. As a result, the operating member 71 moves forward in the direction of the arrow A1.

[0098] When the operating member 71 moves forward, the opening / closing pin 71a passes through the opening / closing guide hole 73 as shown in Fig. 10B. This causes the first movable locking member 70L to move in a direction approaching the fixed locking member 70C by rotating about the shaft 76. When the first movable locking member 70L closes relative to the fixed locking member 70C, the wire W sandwiched between the first movable locking member 70L and the fixed locking member 70C is locked in a form that allows the wire W to move between the first movable locking member 70L and the fixed locking member 70C.

[0099] Furthermore, the second movable locking member 70R moves in a direction approaching the fixed locking member 70C by a rotational movement about the shaft 76. When the second movable locking member 70R closes relative to the fixed locking member 70C, the wire W sandwiched between the second movable locking member 70R and the fixed locking member 70C is locked in a manner that prevents the wire W from slipping out from between the second movable locking member 70R and the fixed locking member 70C.

[0100] Furthermore, when the operating member 71 moves forward, the operation of the operating member 71 is transmitted to the retracting mechanism 53, and the first guide pin 53a retracts.

[0101] After the operating member 71 is advanced to a position where the first movable locking member 70L and the second movable locking member 70R are closed to lock the wire W, the rotation of the motor 80 is temporarily stopped, and the feed motor (not shown) is driven in the reverse rotation direction. As a result, the first feed gear 30L rotates in the reverse direction, and the second feed gear 30R rotates in the reverse direction following the first feed gear 30L.

[0102] Therefore, the wire W held between the first feed gear 30L and the second feed gear 30R is fed in the reverse direction indicated by the arrow R. Since the tip WS side of the wire W is locked between the second movable locking member 70R and the fixed locking member 70C in a manner that prevents it from slipping out, the operation of feeding the wire W in the reverse direction causes the wire W to be wound around the reinforcing bar S in close contact with the reinforcing bar S, as shown in FIG.

[0103] After winding the wire W around the rebar S and stopping the reverse rotation of the feed motor (not shown), the motor 80 is driven in the forward direction to move the operating member 71 forward as indicated by the arrow A1. The forward movement of the operating member 71 is transmitted to the cutting unit 6A by the transmission mechanism 62, causing the movable blade unit 61 to rotate, and the wire W engaged with the first movable locking member 70L and the fixed locking member 70C is cut by the operation of the fixed blade unit 60 and the movable blade unit 61.

[0104] After cutting the wire W, the operating member 71 is moved further forward, so that the bent portions 71b1 and 71b2 move in a direction approaching the reinforcing bar S, as shown in Fig. 11D. As a result, the tip WS side of the wire W locked by the fixed locking member 70C and the second movable locking member 70R is pressed toward the reinforcing bar S by the bent portion 71b1, and is bent toward the reinforcing bar S with the locking position as a fulcrum. As the operating member 71 moves further forward, the wire W locked between the second movable locking member 70R and the fixed locking member 70C is held in a state of being sandwiched by the bent portion 71b1.

[0105] Furthermore, the end WE side of the wire W, which is locked by the fixed locking member 70C and the first movable locking member 70L and cut by the cutting portion 6A, is pressed toward the reinforcing bar S by the bending portion 71b2 and bent toward the reinforcing bar S with the locking position as a fulcrum. As the operating member 71 moves further forward, the wire W locked between the first movable locking member 70L and the fixed locking member 70C is held in a state of being sandwiched by the bending portion 71b2.

[0106] After the tip WS side and the end WE side of the wire W are bent toward the rebar S, the motor 80 is further driven in the forward rotation direction, so that the operating member 71 moves further forward. When the operating member 71 moves to a predetermined position, the rotation restriction portion 74 is released from the lock.

[0107] As a result, the motor 80 is further driven in the forward rotation direction, causing the operating member 71 to rotate in conjunction with the rotating shaft 72, and the locking member 70 holding the wire W to rotate integrally with the operating member 71, twisting the wire W as shown in Figure 11E.

[0108] After twisting the wire W, the motor 80 is driven in the reverse rotation direction. The rotation of the rotating shaft 72 of the operating member 71, which is linked to the rotation of the motor 80, is restricted by the rotation restricting portion 74, and the rotation of the motor 80 is converted into linear movement. As a result, the operating member 71 moves in the direction of the arrow A2, which is the rear direction.

[0109] When the operating member 71 moves rearward, the bent portions 71b1 and 71b2 move away from the wire W, and the holding of the wire W by the bent portions 71b1 and 71b2 is released. Furthermore, when the operating member 71 moves rearward, the opening / closing pin 71a passes through the opening / closing guide hole 73, as shown in FIG. 10A. As a result, the first movable locking member 70L moves in a direction away from the fixed locking member 70C by rotating about the shaft 76 as a fulcrum. Furthermore, the second movable locking member 70R moves in a direction away from the fixed locking member 70C by rotating about the shaft 76 as a fulcrum. As a result, the wire W comes out of the locking member 70.

[0110] 12A, 12B, and 12C are explanatory diagrams showing the movement of the wire in the induction guide of the first embodiment, and next, the effect of guiding the wire W with the induction guide 51A will be described.

[0111] As described above, the wire W having a curl formed by the curl guide 50 moves in the other direction, which is the opposite direction to the one direction in which the reel 20 is offset. Therefore, in the induction guide 51A, the wire W entering between the side surface portion 55L and the side surface portion 55R of the first guide portion 55 first moves toward the third induction portion 55R1 of the side surface portion 55R.

[0112] In the conventional reinforcing bar binding machine, the wire path formed by the curl guide after being curled to form a loop has a diameter of about 50 to 70 mm when assumed to be a circle. In contrast, in the reinforcing bar binding machine 1A, the wire W path formed by the curl guide 50 after being curled to form a loop Ru has a length in the major axis direction of about 75 mm to 100 mm when assumed to be a circle.

[0113] In this way, if we assume that the trajectory of the wire W that is curled by the curl guide 50 to form the loop Ru is an ellipse, when the length in the major axis direction is approximately 75 mm or more and 100 mm or less, the entry angle α1 of the wire W entering toward the third guiding portion 55R1 of the side portion 55R becomes larger compared to conventional rebar binding machines.

[0114] For this reason, in the guide 51A, when the tip WS of the wire W entering toward the third guide portion 55R1 of the side surface portion 55R comes into contact with the third guide portion 55R1, the resistance increases when the tip WS of the wire W is guided along the third guide portion 55R1. Therefore, the wire W does not go to between the narrowest portion 55EL2 of the first guide portion 55L1 and the narrowest portion 55ER2 of the third guide portion 55R1, and there is a possibility that poor feeding occurs.

[0115] Therefore, an approach angle restriction portion 56A is provided to direct the tip of the wire W approaching the third guide portion 55R1 of the side portion 55R between the narrowest portion 55EL2 of the first guide portion 55L1 and the narrowest portion 55ER2 of the third guide portion 55R1.

[0116] That is, the wire W entering between the side surface portion 55L and the side surface portion 55R of the first guide portion 55 enters toward the third guiding portion 55R1 of the side surface portion 55R, so that the portion of the wire W located between the side surface portion 55L and the side surface portion 55R comes into contact with the approach angle restricting portion 56A as shown in Fig. 12B. When the wire W comes into contact with the approach angle restricting portion 56A, a force is applied to the wire W that rotates the tip WS of the wire W in a direction toward between the narrowest portion 55EL2 of the first guiding portion 55L1 and the narrowest portion 55ER2 of the third guiding portion 55R1, with the approach angle restricting portion 56A as a fulcrum.

[0117] 12C, the angle of entry α2 of the wire W entering toward the third guide portion 55R1 of the side portion 55R becomes small (α2<α1), and the tip WS of the wire W moves toward the gap between the narrowest portion 55EL2 of the first guide portion 55L1 and the narrowest portion 55ER2 of the third guide portion 55R1. Thus, the wire W curled by the curl guide 50 can be introduced between the pair of second guide portions 55L2 and fourth guide portions 55R2 of the first guide portion 55.

[0118] Figures 13A, 13B, and 13C are explanatory diagrams showing the state in which the wires are locked by the locking member. Next, the effect of inducing the orientation of the two wires W in parallel when the two wires W are locked by the locking member 70 will be described.

[0119] In conventional rebar binding machines, the wire W is guided to the locking member 70 of the binding unit 7A without contacting the guide surface 57a of the second guide portion 57. In contrast, in the rebar binding machine 1A, in the guide 51A, the wire W guided to the second guide portion 57 by the first guide portion 55L1 and the third guide portion 55R1 of the first guide portion 55 is guided to the locking member 70 of the binding portion 7A by contacting the guide surface 57a, as shown in Figures 11A and 11B.

[0120] When the two wires W come into contact with the guide surface 57a, the parallel orientation of the two wires W is restricted by the guide surface 57a, and the wires W are guided between the fixed locking member 70C and the second movable locking member 70R.

[0121] Since the guide surface 57a is a flat surface, when the two wires W are fed in contact with the guide surface 57a, the two wires W are arranged in parallel in the axial direction of the loop Ru formed by the wires W.

[0122] 13C, the two wires W are arranged in parallel along the direction in which the second movable locking member 70R opens and closes relative to the fixed locking member 70C, and the two wires W are locked with a gap of two wires between the fixed locking member 70C and the second movable locking member 70R. This increases the load on the locking member 70.

[0123] Therefore, the parallel orientation of the two wires W is guided by the feed restricting portion 9A. Figures 14A and 14B are explanatory views showing the movement of the wires in the feed restricting portion, and next, the effect of guiding the wires W by the feed restricting portion 9A will be described.

[0124] The feed regulating portion 9A is provided on the surface where the wire W comes into contact with a parallel regulating portion 90 extending in a direction intersecting the parallel direction of the two wires W regulated by the first wire guide 4A1 and the second wire guide 4A2.

[0125] Since the parallel regulating portion 90 is concave with respect to the feed direction of the wire W fed in the forward direction, when the tip WS of the wire W is pressed against the feed regulating portion 9A, the tip WS of the wire W is guided toward the apex of the recess that constitutes the parallel regulating portion 90.

[0126] As a result, when the two wires W are fed in the forward direction to a position where the tips WS of the two wires W that have passed between the fixed locking member 70C and the second movable locking member 70R come into contact with and are pressed against the feed restricting portion 9A as shown in Fig. 14A, the tips WS of the two wires W are guided along the extending direction of the parallel restriction portion 90 as shown in Fig. 14B. Therefore, the direction in which the two wires W are parallel to each other between the fixed locking member 70C and the second movable locking member 70R is guided to the radial direction of the loop Ru shown in Fig. 3.

[0127] For this reason, as shown in Fig. 13A, the two wires W can be guided to be parallel in a direction intersecting the direction in which the second movable locking member 70R opens and closes relative to the fixed locking member 70C. Therefore, as shown in Fig. 13B, the two wires W are locked in a state in which a gap that allows one wire to be locked is formed between the fixed locking member 70C and the second movable locking member 70R, and the load on the locking member 70 can be reduced and the two wires W can be securely locked.

[0128] FIG. 15A is an oblique view of a key portion showing the curl guide of the first embodiment, FIG. 15B is an exploded oblique view of a key portion showing the curl guide of the first embodiment, FIG. 15C is a side view of a key portion showing the curl guide of the first embodiment, and FIG. 15D is an exploded side view of a key portion showing the curl guide of the first embodiment.

[0129] In the curl guide 50, if the wire W is fed with some kind of obstacle in a position blocking the feed path of the wire W formed by the guide groove 52, the wire W cannot be fed beyond the curl guide 50, and poor feeding of the wire W may occur.

[0130] Therefore, the curl guide 50A of the first embodiment includes an evacuation guide portion 54A that retracts the wire W downstream of the locking member 70 of the bundling portion 7A with respect to the forward feed of the wire W. The evacuation guide portion 54A is provided in the curl guide 50A, and enables the wire W to be retracted from the curl guide 50A downstream of the feed path of the wire W formed between the fixed locking member 70C and the first movable locking member 70L that constitute the locking member 70.

[0131] Guide plate 50L located on one side of curl guide 50A has a protrusion 50AL that protrudes downstream from guide plate 50C located in the center of curl guide 50A with respect to the forward feed of wire W indicated by arrow F. Guide plate 50R located on the other side of curl guide 50A has a protrusion 50AR that protrudes downstream from guide plate 50C with respect to the forward feed of wire W. Protrusion 50AL of guide plate 50L and protrusion 50AR of guide plate 50R protrude in the same direction from guide plate 50C by a length longer than the diameter of one wire W.

[0132] The guide plates 50L and 50R are inclined in a direction such that the protrusions 50AL and 50AR protrude radially outward from the loop Ru formed by the wire W relative to the guide plate 50C.

[0133] As a result, the convex portion 50AL of the guide plate 50L and the convex portion 50AR of the guide plate 50R protrude from the guide plate 50C toward the downstream side with respect to the forward feed of the wire W.

[0134] Therefore, the evacuation guide portion 54A is configured by providing a space at the tip of the curl guide 50A between the convex portion 50AL of the guide plate 50L and the convex portion 50AR of the guide plate 50R, allowing the wire W to pass radially outward of the loop Ru formed by the wire W, when the wire W is fed in the forward direction.

[0135] As a result, in the curl guide 50A, when the wire W is fed with some obstacle in a position blocking the feed path of the wire W formed by the guide groove 52, the wire W that comes into contact with the obstacle passes through the retreat guide portion 54A toward the radial outside of the loop Ru formed by the wire W, and is fed to the outside of the curl guide 50A. This prevents buckling and the like from occurring, and even if a feeding failure occurs, the wire W can be easily removed. This makes it possible to prevent the occurrence of obstacles caused by poor feeding of the wire W.

[0136] Fig. 16A is a perspective view of a main part of the curl guide of the second embodiment, Fig. 16B is an exploded perspective view of a main part of the curl guide of the second embodiment, Fig. 16C is a side view of a main part of the curl guide of the second embodiment, and Fig. 16D is an exploded side view of a main part of the curl guide of the second embodiment. In curl guide 50B of the second embodiment, the same components as those of curl guide 50A of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

[0137] The curl guide 50B of the second embodiment includes an evacuation guide portion 54B that retracts the wire W downstream of the locking member 70 of the bundling portion 7A with respect to the forward feed of the wire W. The evacuation guide portion 54B is provided in the curl guide 50B, and enables the wire W to be retracted from the curl guide 50B downstream of the feed path of the wire W formed between the fixed locking member 70C and the first movable locking member 70L that constitute the locking member 70.

[0138] Guide plate 50L located on one side of curl guide 50B has a protrusion 50BL that protrudes downstream from guide plate 50C located in the center of curl guide 50B with respect to the forward feed of wire W indicated by arrow F. Guide plate 50R located on the other side of curl guide 50B has a protrusion 50BR that protrudes downstream from guide plate 50C with respect to the forward feed of wire W. Protrusion 50BL of guide plate 50L and protrusion 50BR of guide plate 50R protrude in the same direction from guide plate 50C by a length longer than the diameter of one wire W.

[0139] The protrusion 50BL of the guide plate 50L and the protrusion 50BR of the guide plate 50R protrude in a semicircular shape from the guide plate 50C toward the downstream side with respect to the forward feed of the wire W.

[0140] As a result, the convex portion 50BL of the guide plate 50L and the convex portion 50BR of the guide plate 50R protrude from the guide plate 50C toward the downstream side with respect to the forward feeding of the wire W.

[0141] Therefore, the retreat guide portion 54B is configured by providing a space at the tip of the curl guide 50B between the convex portion 50BL of the guide plate 50L and the convex portion 50BR of the guide plate 50R, allowing the wire W to pass radially outward of the loop Ru formed by the wire W, when the wire W is fed in the forward direction.

[0142] As a result, in the curl guide 50B, when the wire W is fed with some obstacle at a position blocking the feed path of the wire W formed by the guide groove 52, the wire W that comes into contact with the obstacle passes through the retreat guide portion 54B toward the radial outside of the loop Ru formed by the wire W, and is fed to the outside of the curl guide 50B. This prevents buckling and the like from occurring, and even if a feeding failure occurs, the wire W can be easily removed. This makes it possible to prevent the occurrence of obstacles caused by poor feeding of the wire W.

[0143] Fig. 17A is a perspective view of a main part of the curl guide of the third embodiment, Fig. 17B is an exploded perspective view of the main part of the curl guide of the third embodiment, Fig. 17C is a side view of the main part of the curl guide of the third embodiment, and Fig. 17D is an exploded side view of the main part of the curl guide of the third embodiment. In curl guide 50D of the third embodiment, the same components as those of curl guide 50A of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

[0144] The curl guide 50D of the third embodiment includes evacuation guide portions 54DL, 54DR that retract the wire W downstream of the locking member 70 of the bundling portion 7A with respect to the forward feed of the wire W. The evacuation guide portions 54DL, 54DR are provided on the curl guide 50D and enable the wire W to be retracted from the curl guide 50D downstream of the feed path of the wire W formed between the fixed locking member 70C and the first movable locking member 70L that constitute the locking member 70.

[0145] Guide plate 50C, which is sandwiched between guide plates 50L and 50R and located at the center of curl guide 50D, has a protrusion 50DC that protrudes from guide plates 50L and 50R toward the downstream side with respect to the forward feed of wire W indicated by arrow F. Protrusion 50DC of guide plate 50C protrudes in the upward direction from guide plates 50L and 50R with a length longer than the diameter of one piece of wire W.

[0146] The guide plate 50C is inclined in a direction such that the protruding portion 50DC protrudes radially outward from the loop Ru formed by the wire W relative to the guide plates 50L and 50R.

[0147] As a result, the convex portion 50DC of the guide plate 50C protrudes from the guide plates 50L and 50R toward the downstream side with respect to the forward feed of the wire W.

[0148] Therefore, the retreat guide portion 54DL is configured to provide a space at the tip of the curl guide 50D on the guide plate 50L side relative to the convex portion 50DC of the guide plate 50C with respect to the forward feed of the wire W, through which the wire W can pass outward in the axial direction of the loop Ru formed by the wire W. The retreat guide portion 54DR is configured to provide a space at the tip of the curl guide 50D on the guide plate 50R side relative to the convex portion 50DC of the guide plate 50C with respect to the forward feed of the wire W, through which the wire W can pass outward in the axial direction of the loop Ru formed by the wire W.

[0149] As a result, in the curl guide 50D, when the wire W is fed with some obstacle in a position blocking the feed path of the wire W formed by the guide groove 52, the wire W that comes into contact with the obstacle passes through the retreat guide portion 54DL or the retreat guide portion 54DR toward the outside along the axial direction of the loop Ru formed by the wire W, and is fed to the outside of the curl guide 50D. This prevents buckling and the like from occurring, and makes it easy to remove the wire W even if a feed failure occurs. This makes it possible to prevent the occurrence of obstacles caused by poor feed of the wire W.

[0150] 18 is an exploded side view of a main part of the curl guide according to the fourth embodiment. In the curl guide 50E of the fourth embodiment, the same components as those in the curl guide 50A of the first embodiment are denoted by the same reference numerals and detailed description thereof will be omitted.

[0151] The curl guide 50E of the fourth embodiment is provided with an evacuation guide portion 54CE that enables the wire W to be evacuated from the curl guide 50E downstream of the locking member 70 of the binding portion 7A with respect to the forward feed of the wire W, specifically, downstream of the feed path of the wire W formed between the fixed locking member 70C and the first movable locking member 70L that constitute the locking member 70.

[0152] The evacuation guide portion 54CE is configured by providing a recess in the guide plate 50C located at the center of the curl guide 50E, which extends from the guide groove 52 in the radial direction of the loop Ru formed by the wire W. The evacuation guide portion 54CE is provided upstream of the third guide pin 53c. In a configuration including the second guide pin 53b, the evacuation guide portion 54CE is provided upstream of the third guide pin 53c, between the second guide pin 53b and the third guide pin 53c.

[0153] As a result, in the curl guide 50E, when the wire W is fed with some obstacle K at a position blocking the feed path of the wire W formed by the guide groove 52, the wire W that comes into contact with the obstacle is bent toward the radial outside of the loop Ru formed by the wire W, downstream of the first guide pin 53a, and enters the evacuation guide portion 54CE. Therefore, the occurrence of an obstacle due to poor feeding of the wire W can be suppressed.

[0154] 19 is an exploded side view of a main part of the curl guide according to the fifth embodiment. In the curl guide 50F of the fifth embodiment, the same components as those in the curl guide 50A of the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0155] The curl guide 50F of the fifth embodiment is provided with an evacuation guide portion 54CF that enables the wire W to be evacuated from the curl guide 50E downstream of the locking member 70 of the binding portion 7A with respect to the forward feed of the wire W, specifically, downstream of the feed path of the wire W formed between the fixed locking member 70C and the first movable locking member 70L that constitute the locking member 70.

[0156] The retraction guide portion 54CF is configured by providing a hole portion in the guide plate 50C located at the center of the curl guide 50F, which extends from the guide groove 52 in the radial direction of the loop Ru formed by the wire W and penetrates the guide plate 50C. The retraction guide portion 54CF is provided upstream of the third guide pin 53c and communicates with the outside of the curl guide 50E toward the radial outside of the loop Ru formed by the wire W. In a configuration including the second guide pin 53b, the retraction guide portion 54CF is provided upstream of the third guide pin 53c between the second guide pin 53b and the third guide pin 53c and communicates with the outside of the curl guide 50E toward the radial outside of the loop Ru formed by the wire W.

[0157] As a result, in the curl guide 50F, when the wire W is fed with some obstacle K at a position blocking the feed path of the wire W formed by the guide groove 52, the wire W that comes into contact with the obstacle bends downstream of the first guide pin 53a toward the outside in the radial direction of the loop Ru formed by the wire W, enters the retreat guide portion 54CF, and is fed to the outside of the curl guide 50F. This makes it possible to suppress the occurrence of obstacles caused by poor feeding of the wire W.

[0158] 20 is an explanatory diagram showing the operation of removing the reinforcing bar from the curl forming section. In the reinforcing bar binding machine 1A, in the curl guide 50 constituting the curl forming section 5A, the space between the tip 50S of the curl guide 50 and the open end 55E1 of the leading guide 51A with respect to the forward feed of the wire W becomes the insertion / removal opening 59 for the reinforcing bar S. In the insertion / removal opening 59, the center O1 between the tip 50S of the curl guide 50 and the open end 55E1 of the leading guide 51A is offset toward the leading guide 51A with respect to the binding axis O, which is the center of rotation of the binding section 7A.

[0159] The portion of the curl guide 51A facing the curl guide 50 is inclined in a direction away from the curl guide 50 with respect to the bundling axis O as it approaches the insertion / removal opening 59. In contrast, the curl guide 50 also has a first discharge guide surface 50E1 at a portion facing the curl guide 51A, which is inclined at a predetermined angle β in a direction approaching the curl guide 51A with respect to the bundling axis O, i.e., in the offset direction of the insertion / removal opening 59, as it approaches the insertion / removal opening 59. The curl guide 50 also has a second discharge guide surface 50E2 connecting the first discharge guide surface 50E1 and the insertion / removal opening 59.

[0160] As a result, even if the reinforcing bar S tied with the wire W comes into contact with the curl guide 50 when being removed from the curl forming section 5A, the reinforcing bar S is guided along the slope of the first discharge guide surface 50E1 to the second discharge guide surface 50E2 and removed through the insertion / removal opening 59. [Explanation of symbols]

[0161] REFERENCE SIGNS LIST 1A rebar tying machine, 10A main body, 2A magazine (storage section), 20 reel, 21 hub section, 22, 23 flange section, 3A wire feed section, 30L first feed gear (feed member), 31L teeth section, 32L groove section, 30R second feed gear (feed member), 31R teeth section, 32R groove section, 36 first displacement member, 37 second displacement member, 38 spring, 4A1 first wire guide, 4A2 second wire guide, 5A curl type forming portion, 50, 50A, 50B, 50D, 50E, 50F... curl guide, 50AL, 50AR, 50BL, 50BR, 50DC... convex portion, 50S... tip, 50E1... first discharge guide surface, 50E2... second discharge guide surface, 51A... guide guide, 52... guide groove, 53... evacuation mechanism, 53a... first guide pin, 53b... second guide pin, 53c... third guide pin, 54A, 54B, 54DL, 54DR, 54CE, 54CF... evacuation guide portion, 55... first guide portion , 55L... side portion, 55R... side portion, 55D... bottom portion, 55L1... first guide portion, 55L2... second guide portion, 55R1... third guide portion, 55R2... fourth guide portion, 55S... focusing passage, 55E1... opening end, 55E2... narrowest portion, 55EL1... opening end, 55ER1... opening end, 55EL2... narrowest portion, 55ER2... narrowest portion, 55EL3... virtual line, 56A... approach angle regulating portion, 57... second guide portion, 57a... guide surface, 59... insertion / removal port, 6A Cutting portion, 60... fixed blade portion, 61... movable blade portion, 62... transmission mechanism, 7A... binding portion, 70... locking member, 70L... first movable locking member, 70R... second movable locking member, 70C... fixed locking member, 71... operating member, 71a... opening / closing pin, 71b1... bending portion, 71b2... bending portion, 72... rotating shaft, 73... opening / closing guide hole, 74... rotation regulating portion, 8A... driving portion, 80... motor, 81... reducer, 9A... feed regulating portion, 90... parallel regulating portion, W... wire

Claims

[Claim 1] a wire feed unit for feeding a wire to be wound around a bundle; A bundling unit that twists the wire wound around the bundling object; a curl guide for curling the wire fed by the wire feeding unit; a curl guide for guiding the wire curled by the curl guide to the bundling section; a retraction guide section for retracting the wire downstream of the bundling section with respect to a wire feed direction in which the wire is fed by the wire feed section in a direction in which the wire is curled by the curl guide, the curl guide includes first and second guide plates and a third guide plate sandwiched between the first and second guide plates, the first and second guide plates each include a protrusion protruding from the third guide plate toward a downstream side with respect to a feeding direction of the wire fed by the wire feeding unit in a direction in which the wire is curled by the curl guide; the protrusion has a length longer than a diameter of one wire and protrudes from the third guide plate toward a downstream side with respect to a feeding direction of the wire fed by the wire feeding unit in a direction in which the wire is curled by the curl guide, the retraction guide portion is provided between the protrusions on the radial outside of a loop formed by the wire to be curled by the curl guide, The first and second guide plates are inclined in a direction such that the protrusions protrude radially outward from the third guide plate with respect to the loop formed by the wire. Binding machine.

Images