End Machine

Abstract

To prevent conveying failure of a wire and wear of a conveying path, etc. in a bonding machine.SOLUTION: A reinforcing bar binding machine 1A comprises: a wire feeding part 3 for feeding a wire W in a first direction and a second direction; a curl formation part 5 for giving a winding habit to the wire W fed by the wire feeding part 3; a binding part 7 for twisting the wire W, imparted with the winding habit by the curl formation part 5, by the rotation of a twisting shaft 72; a first path 90a provided between the binding part 7 and the wire feeding part 3; and a second path 90b extending from the wire feeding part 3 toward a rear side of a main body 10. The first path 90a contains a bending part bending from a feeding direction of the wire W fed by the wire feeding part 3 toward the curl formation part 5, and the bending part has load reduction parts such as hard pins 120a, 120b, 120c, etc. for reducing a load of the wire W.SELECTED DRAWING: Figure 9A

Description

[Technical field]

[0001] The present disclosure relates to a strapping machine. [Background technology]

[0002] In general, concrete structures use reinforcing bars and other binding materials to reinforce the tensile strength. Before pouring a concrete structure, the binding materials are bound with wire or the like to prevent the reinforcing bars from shifting from their designated positions. In this case, if the binding with wire is loose, the binding materials will shift out of position, and the binding materials will not provide the appropriate strength. For this reason, there is a demand for binding materials to be bound tightly with wire.

[0003] To address these issues, the following techniques have been proposed: For example, Patent Document 1 discloses a rebar binding machine that sends out a wire in a loop shape and winds it around a rebar, then holds the tip of the wire while pulling it back to wind it around the rebar, and then twists the wire to fasten the rebar. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-34305 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional rebar binding machine disclosed in Patent Document 1 and the like, the wire reel is located on the front side of the main body, so when trying to bind an object of a complex structure, the rebar binding machine cannot enter the object because the reel storage unit is located on the front side of the main body, and the object cannot be bound. Also, some binding machines that do not retract the wire after winding it around the object have a reel storage unit located on the rear side of the main body, but this causes problems such as poor wire transport when the wire is fed and wear on the transport path inside the binding machine due to friction with the wire.

[0006] SUMMARY OF THE PRESENT DISCLOSURE OF THE PRESENT DISCLOSURE An object of the present invention is to provide a binding machine capable of preventing poor wire transport and wear on the transport path within the binding machine. [Means for solving the problem]

[0007] According to the present disclosure, there is provided a rebar binding machine that feeds a wire in a first direction to give it a curl to surround an object to be bound with the wire, then returns the wire in a second direction opposite to the first direction to wrap the wire around the object to be bound, and twists the wire to bind the object to be bound, the rebar binding machine comprising: a main body; a wire feed unit provided within the main body for feeding the wire in the first direction and the second direction; a curl forming unit provided on the front end side of the main body for giving a curl to the wire fed by the wire feed unit; a binding unit that includes a torsion shaft extending across the front end side and the rear end side of the main body and twists the wire that has been curled by the curl forming unit by rotating the torsion shaft; a first transport path provided between the binding unit and the wire feed unit; and a second transport path extending from the wire feed unit toward the rear side of the main body, It is formed into a pipe shape, The wire feeder includes a bending portion that bends from a feeding direction of the wire fed by the wire feeder toward the curl forming portion, and the bending portion has a load reducing portion that reduces a load on the wire. The load reducing portion is provided at the bent portion and includes a pin or roller having a peripheral surface partially exposed within the pipe-shaped first conveying path. A strapping machine is provided. Effect of the Invention

[0008] According to the present disclosure, since the bending section having the load reducing section is provided in the first transport path, it is possible to reduce the load on the wire or reel housing section when the wire is fed or returned. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a side view of the reinforcing bar binding machine according to the present embodiment. [Diagram 2] FIG. 1 is a perspective view of a reinforcing bar binding machine according to an embodiment of the present invention. [Diagram 3] 1 is a side view showing a state in which a lid of a reel housing part of a reinforcing bar binding machine according to an embodiment of the present invention is open. FIG. [Figure 4] 1 is a perspective view showing a state in which a lid of a reel housing part of a reinforcing bar binding machine according to an embodiment of the present invention is open. FIG. [Figure 5A] FIG. 2 is a side view of the internal configuration of the reinforcing bar binding machine according to the present embodiment. [Figure 5B] 1 is a cross-sectional view of the internal configuration of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 6A] 13A and 13B are views showing a cover of a reel housing part according to the embodiment of the present invention. [Figure 6B] 13A and 13B are diagrams illustrating modified examples of the reel housing portion. [Figure 7] FIG. 4 is a cross-sectional view showing a guide portion according to the present embodiment. [Figure 8A] 4 is a cross-sectional view of the buckling prevention portion of the reinforcing bar binding machine shown in FIG. 3 taken along line AA. [Figure 8B] 4 is a cross-sectional view taken along line AA of the reinforcing bar binding machine shown in FIG. 3 when no buckling prevention unit is provided. [Figure 9A] FIG. 4 is a cross-sectional view of a guide portion of the reinforcing bar binding machine according to the first modified example. [Figure 9B] FIG. 11 is a cross-sectional view of a guide portion of a reinforcing bar binding machine according to a second modified example. [Figure 10A] FIG. 13 is a diagram showing an example of the arrangement of a guide section and a wire feed section of a reinforcing bar binding machine according to a third modified example. [Figure 10B] FIG. 13 is a diagram showing an example of the arrangement of a guide section and a wire feed section of a reinforcing bar binding machine according to a fourth modified example. [Figure 10C]FIG. 13 is a diagram showing an example of the arrangement of a guide section and a wire feed section of a reinforcing bar binding machine according to a fifth modified example. [Figure 10D] FIG. 13 is a diagram showing an example of the arrangement of a guide section and a wire feed section of a reinforcing bar binding machine according to a sixth modified example. [Figure 10E] FIG. 13 is a diagram showing an example of the arrangement of a guide section and a wire feed section of a reinforcing bar binding machine according to a seventh modified example. [Figure 11] FIG. 13 is a side view of a reinforcing bar binding machine according to an eighth modified example. [Figure 12] FIG. 13 is a perspective view of a reinforcing bar binding machine according to an eighth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0011] <Configuration example of rebar binding machine 1A> FIG. 1 is a side view of a reinforcing bar tying machine 1A according to this embodiment, FIG. 2 is an oblique view of the reinforcing bar tying machine 1A, FIG. 3 is a side view showing the state in which the lid 22 of the reel storage section 2 of the reinforcing bar tying machine 1A is open, FIG. 4 is an oblique view showing the state in which the lid 22 of the reel storage section 2 of the reinforcing bar tying machine 1A is open, FIG. 5A is a side view of the internal structure of the reinforcing bar tying machine 1A, FIG. 5B is a cross-sectional view of the internal structure of the reinforcing bar tying machine 1A, FIG. 6A is a diagram showing the lid 22 of the reel storage section 2, and FIG. 6B is a diagram showing a modified example of the reel storage section 2.

[0012] In this embodiment, the longitudinal direction of the main body 10 (the direction corresponding to the left-right direction in FIG. 1) is the front-rear direction, the side where the curl forming unit 5 is provided is the front side or tip side of the reinforcing bar binding machine 1A, and the side where the reel storage unit 2 is provided is the rear side of the reinforcing bar binding machine 1A. In addition, the side where the battery 15 is provided in a direction perpendicular to the front-rear direction is the lower side of the reinforcing bar binding machine 1A, and the opposite side is the upper side of the reinforcing bar binding machine 1A. Furthermore, in a direction perpendicular to the front-rear direction and the up-down direction of the reinforcing bar binding machine 1A, the side where the twisting motor 80 is provided (the back side of the paper in FIG. 1) is the right side of the reinforcing bar binding machine 1A, and the side where the reel storage unit 2 is provided (the front side of the paper in FIG. 1) is the left side of the reinforcing bar binding machine 1A.

[0013] In addition, in this embodiment, the direction in which the feed motor 30 is rotated forward to feed the wire W, for example, from the wire feed unit 3 side to the curl forming unit 5 side, is defined as the forward direction (first direction), and the direction in which the feed motor 30 is rotated reversely to feed the wire W, for example, from the curl forming unit 5 side to the wire feed unit 3 side, is defined as the reverse direction (second direction).

[0014] As shown in Figs. 1 to 5B and the like, the reinforcing bar binding machine 1A includes a main body 10 having an elongated, substantially rectangular parallelepiped shape, a reel housing section 2 in which the wire W is housed, a wire feeding section 3 that feeds the wire W in the forward and reverse directions, and a curl forming section 5 that winds the wire W fed by the wire feeding section 3 around the reinforcing bar S. The reinforcing bar binding machine 1A also includes a cutting section 6 that cuts the wire W wound around the reinforcing bar S by the wire feeding section 3, a binding section 7 that twists the wire W wound around the reinforcing bar S, and a drive section 8 that drives the binding section 7. According to the reinforcing bar binding machine 1A, the wire W is fed in the forward direction to be wound around the reinforcing bar S, and the wire W wound around the reinforcing bar S is fed in the reverse direction to be wound around the reinforcing bar S, and then the wire W can be twisted to bind the reinforcing bar S.

[0015] 1 and other figures, a transport path 90 for transporting the wire W in the forward or reverse direction is provided within the main body 10. The transport path 90 is formed below the torsion axis 72 extending from the front end side to the rear end side of the main body 10, more specifically, below the main body 10, and between the reel housing section 2 and the curl forming section 5 within the main body 10.

[0016] 1 to 6A, the reel housing 2 rotatably houses the reel 26 around which the wire W is wound so as to be payable, and also houses the reel 26 so as to be detachable and replaceable with respect to the main body 10. The reel housing 2 is disposed at the rear of the main body 10 behind the trigger 12. The reel housing 2 is also disposed at a position offset to the left with respect to the wire feed unit 3, perpendicular to the axial direction of the torsion shaft 72.

[0017] The reel housing 2 has a recess 20 formed in the left side wall 10a of the main body 10, and a lid 22 for opening and closing the recess 20. The recess 20 is formed to a size capable of housing a flange portion 26b (see FIG. 6A) on one side of a substantially cylindrical reel 26, and has a reel support portion 21 for rotatably supporting the reel 26.

[0018] As shown in FIG. 6A, the cover 22 has a cylindrical peripheral wall 22a, an end wall 22b covering an opening on one side of the peripheral wall 22a, an entrance 22c for the wire W formed in a part of the peripheral wall 22a, and a path cover 22d communicating with the entrance 22c and covering a part of the conveying path 90 (a second path 90b described later). A rotating part 22e for rotatably mounting the cover 22 to the main body 10 is provided at the upper end of the peripheral wall 22a. The rotating part 22e of the cover 22 is mounted on a mounting part 10e (see FIG. 2) formed on the main body 10, so that the cover 22 can rotate around the rotating part 22e. When the cover 22 is opened, the reel 26 can be set in the recess 20, and the reel 26 set in the recess 20 can be removed. When the cover 22 is closed, the cover 22 is locked to the main body 10 by a locking mechanism (not shown).

[0019] In the present embodiment, the rotation axis of the rotating part 22e of the cover 22 is arranged along the longitudinal direction of the main body 10 in FIG. 2 and the like, but as shown in FIG. 6B, the rotation axis of the rotating part 22e may be arranged in the lateral direction (left-right direction) of the main body 10 so that the reel 26 can be set from the rear of the main body 10, and the cover 22 may be opened and closed with respect to the rear of the main body 10. In this case, for example, the attachment part 10e is provided at the rear end of the lower surface side of the main body 10, and the cover 22 is configured to be rotatable with the rotation axis of the rotating part 22e of the cover 22 as a fulcrum. In addition, a lock mechanism 23 may be provided at the upper end of the cover 22 to lock the cover 22 to the main body 10. In addition, the rotating part 22e and the attachment part 10e may be provided on the upper side of the main body 10 opposite to FIG. 6B. Furthermore, the reel storage part 2 may be arranged at a position shifted rearward from the torsion motor 80 with the rotating part 22e arranged along the longitudinal direction as shown in FIG. 1 and the like. In this case, the reel housing portion 2 may be disposed with an offset relative to the torsion motor 80, or may not be disposed with an offset.

[0020] 4, the reel 26 includes a cylindrical hub portion 26a around which the wire W is wound, and a pair of flange portions 26b, 26b integrally provided on both axial ends of the hub portion 26a. One or more wires W are wound around the hub portion 26a of the reel 26, and the wires W can be pulled out from the reel 26. The wire W is, for example, 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.

[0021] As shown in Fig. 1 etc., the grip 11 extends substantially downward from the lower surface, which is a part of the circumferential surface of the main body 10, and is substantially in the middle in the longitudinal direction of the main body 10. In other words, the grip 11 is provided below the torsion axis 72 extending in the front-rear direction of the main body 10. A trigger 12, which is an example of an activation unit, is provided on the front surface of the upper end of the grip 11. When the user pulls the trigger 12 while the power is on, a bundling operation is performed. A battery 15 constituting a power source is detachably attached to the lower part of the grip 11.

[0022] 5A and 5B, the wire feed unit 3 has a pair of first and second feed gears, and feeds the wire W by clamping the wire W between a groove formed in the gear teeth of the first feed gear and a groove formed in the gear teeth of the second feed gear. The first feed gear of the wire feed unit 3 is connected to, for example, a feed motor 30, and rotates by being driven by the feed motor 30. The second feed gear of the wire feed unit 3 is rotated in response to the rotation of the first feed gear. When the rotation direction of the feed motor 30 is forward, the wire feed unit 3 feeds the wire W in the forward direction, and when the rotation direction of the feed motor 30 is switched to reverse, the wire feed unit 3 feeds the wire W in the reverse direction.

[0023] 1 and 5B, the curl forming unit 5 is provided at the tip side of the main body 10, above the torsion axis 72. The curl forming unit 5 includes a curl guide 50 that curls the wire W fed by the wire feed unit 3, and an induction guide 51 that guides the wire W curled by the curl guide 50 to the bundling unit 7.

[0024] 5B and other figures, the curl guide 50 has a guide groove 52 that forms a feed path for the wire W, and a first guide pin 53a and a second guide pin 53b that work with the guide groove 52 to give the wire W a curling habit. The first guide pin 53a is disposed on the upstream side of the curl guide 50 in the positive direction, i.e., the introduction side of the wire W, and on the inside of the passing wire W. The second guide pin 53b is disposed on the downstream side of the curl guide 50 in the positive direction, i.e., the discharge side of the wire W, and on the outside of the passing wire W.

[0025] The curl forming unit 5 includes a retraction mechanism 53 that retracts the first guide pin 53a. When the wire feed unit 3 feeds the wire W in the reverse direction, the retraction mechanism 53 retracts the first guide pin 53a from the transport path along which the wire W to be wound around the reinforcing bar S moves.

[0026] 5A and 5B, the cutting unit 6 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 7 to the movable blade unit 61. The movable blade unit 61 cuts the wire W in cooperation with the fixed blade unit 60 by rotating about the fixed blade unit 60 as a fulcrum axis due to the operation of the binding unit 7 transmitted by the transmission mechanism 62.

[0027] 5A and 5B, the bundling unit 7 includes a locking member 70 to which the wire W is locked, an actuating member 71 for opening and closing the locking member 70, and a torsion shaft 72 for actuating the locking member 70 and the actuating member 71. The locking member 70 operates in conjunction with the movement of the actuating member 71, and grasps a portion of the wire W before it passes through the curl forming unit 5 in a movable state, and grasps a portion of the wire W after it passes through the curl forming unit 5 in a state in which it cannot come off the locking member 70. The actuating member 71 moves forward to bend each of the ends of the wire W grasped at the tip side of the locking member 70 toward the reinforcing bar S.

[0028] 5A and 5B, the drive unit 8 includes a torsion motor 80 and a reducer 81 that reduces speed and amplifies torque. The torsion shaft 72 and the torsion motor 80 are connected via the reducer 81, and the torsion shaft 72 is rotated by the drive of the torsion motor 80 via the reducer 81.

[0029] Further, the reinforcing bar binding machine 1A according to this embodiment includes a guide portion 100A, a buckling prevention portion 200, and a wear prevention portion 300, which are examples of a load reducing portion.

[0030] First, the guide section 100A will be described. Fig. 7 is a cross-sectional view showing the guide section 100A according to this embodiment. As shown in Fig. 7, the guide section 100A is provided between the wire feed section 3 (see Fig. 5A) and the cutting section 6, and guides the wire W when feeding the wire W to the curl forming section 5 and when pulling back the wire W fed to the curl forming section 5. Before describing the guide section 100A, a problem that occurs in the transport path 90 when the reel housing section 2 is disposed at the rear of the main body 10 will be described.

[0031] When the reel housing 2 is disposed at the rear of the main body 10, the wire W is sent to the curl forming unit 5 through a transport path formed above or below the torsion axis 72 inside the main body 10. In a reinforcing bar binding machine that returns the wire W after surrounding the reinforcing bar S with the wire W, the curl forming unit 5 is disposed on the opposite side of the transport path of the wire W because it is necessary to cross the wire W at the binding unit 7. In the reinforcing bar binding machine 1A of this embodiment, as shown in FIG. 1, when a transport path 90 for the wire W is provided below the main body 10, the curl forming unit 5 is disposed above the torsion axis 72.

[0032] Therefore, in order to feed the wire W from the conveying path 90 on the lower side of the main body 10 to the curl forming unit 5 on the upper side, a conveying path having a bent portion must be provided between the wire feed unit 3 and the curl forming unit 5. In this case, the curvature of the conveying path of the wire W becomes small, and therefore, when the wire W is fed in the forward or reverse direction, the wire W may come into contact with the bent portion in the conveying path, and the load resistance to the wire W may increase, resulting in poor conveyance of the wire W. In this embodiment, a guide unit 100A is provided between the wire feed unit 3 and the curl forming unit 5 to reduce the load resistance when the wire W is fed and returned. In this embodiment, the conveying path having a bent portion provided between the wire feed unit 3 and the curl forming unit 5 among the conveying paths 90 is referred to as a first path 90a.

[0033] In this embodiment, the guide section 100A includes a pipe 110 having a diameter larger than that of the wire W, as shown in FIG. 7. The pipe 110 is curved from the wire feed section 3 toward the curl forming section 5 (cutting section 6), and functions as a first path 90a of the wire W between the wire feed section 3 and the curl forming section 5. The downstream end of the pipe 110 is attached to, for example, the plate 63 constituting the cutting section 6. The upstream end of the pipe 110 extends to the front of the wire feed section 3, and is configured with a wider diameter than other parts so that the wire W can be easily inserted, and the opening area is large. The pipe 110 is formed of a low-friction material that can reduce the load resistance when it comes into contact with the wire W fed by the wire feed section 3. As the low-friction material, for example, a self-lubricating composite material such as a dry bearing or a surface treatment such as hard chrome plating or vanadium carbide coating can be used. Furthermore, it is even better if the pipe 110 has high wear resistance.

[0034] Next, the buckling prevention unit 200 will be described. Fig. 8A is a cross-sectional view of the rebar binding machine 1A shown in Fig. 3 taken along line AA, and shows the buckling prevention unit 200 according to this embodiment. Fig. 8B shows the state of the wire W when the buckling prevention unit 200 is not provided. Of the transport path 90, the transport path between the reel housing unit 2 and the wire feed unit 3 is referred to as a second path 90b.

[0035] 8A, the buckling prevention unit 200 is provided in the second path 90b connecting the reel housing unit 2 and the wire feed unit 3, and prevents buckling of the wire W by supporting a part of the wire W when the wire W is returned. Before describing the buckling prevention unit 200, a problem of buckling of the wire W that occurs in the second path 90b when the reel housing unit 2 is disposed at the rear of the main body 10 will be described.

[0036] When the wire W is returned, the reel 26 is a driven member, so it rotates slightly or hardly at all with the return amount (biasing force) of the wire W when it is returned. Therefore, when the wire W is returned, as shown by the wire W shown by the dashed line in Fig. 3, it spreads toward the bottom wall 10b side of the second path 90b and is fed while being pushed toward the upstream side of the reel housing part 2. As a result, when the wire W is returned, a compressive force acts on the wire W spread toward the bottom wall 10b side from the wire feed part 3 side toward the reel housing part 2 side, causing the wire W to buckle. Note that when the wire W is fed, it is fed from the reel 26 in a taut state by the drive of the wire feed part 3, so that it passes through the wire path shown by the solid line in Fig. 3.

[0037] Here, we will explain the theory behind the buckling of the wire W. Buckling refers to the phenomenon in which, when the load applied to a structure (bundled object) is gradually increased, the deformation pattern suddenly changes at a certain load, causing a large deflection or breakage. The load that causes the buckling phenomenon in a structure is called the buckling load of that structure. The buckling load is given by the following formula (1).

[0038]

number

[0039] In the above formula (1), Pk is the buckling load (also called the buckling strength), E is the Young's modulus, I is the second moment of area, and L is the buckling length (distance between supports).

[0040] The buckling load Pk means that the structure will not buckle even if it is subjected to the buckling load Pk. Therefore, the shorter the buckling length L, the larger the buckling load Pk, and the less likely the wire W will buckle. Therefore, as shown in Fig. 8B, when the buckling length L is the distance between the supports of the wire feed unit 3 and the reel 26, the buckling load Pk becomes small, which causes a problem that buckling is more likely to occur when the wire W is returned.

[0041] In contrast, in this embodiment, as shown in Fig. 8A, a buckling prevention part 200 that supports a part of the wire W when the wire W is returned is provided on the bottom wall 10b or the like of the second path 90b between the reel housing part 2 and the wire feed part 3. The buckling prevention part 200 includes, for example, at least a first surface 201 having a slope larger than the slope of the wire W when it is returned, and a second surface 202 having a slope smaller than the slope of the wire W. An upstream end edge of the first surface 201 and a downstream end edge of the second surface 202 are connected, and the connection part forms a support part 203 that abuts against the wire W.

[0042] By providing the buckling prevention section 200 in the middle of the second path 90b between the wire feed section 3 and the reel 26, the buckling length L shown in Fig. 8B can be divided into a buckling length L1 between the wire feed section 3 and the support section 203 and a buckling length L2 between the support section 203 and the reel 26 as shown in Fig. 8A. Therefore, the buckling length L shown in Fig. 8B can be set substantially shorter, and the buckling load Pk of the above formula (1) in each section of the buckling lengths L1 and L2 can be increased. This makes it possible to prevent buckling of the wire W when it is returned through the second path 90b.

[0043] Next, the wear prevention part 300 will be described. As shown in Fig. 4, Fig. 6A, etc., the wear prevention part 300 reduces friction between the wire W and the reel accommodating part 2 that occurs when the wire W is returned, or protects the reel accommodating part 2 with a hard member, thereby preventing wear of the reel accommodating part 2. First, before describing the wear prevention part 300, a problem of wear that occurs in the reel accommodating part 2 when the reel accommodating part 2 is disposed at the rear of the main body 10 will be described.

[0044] When the wire W is returned, the reel 26 is a driven member, so it does not rotate much or rotates slightly with the return amount (biasing force) of the wire W. Therefore, when the wire W is returned, it is sent while spreading out in the outer circumferential direction of the peripheral wall 22a of the lid 22 of the reel housing 2, for example, as shown by the broken line wire in Fig. 3. This causes a problem that the wire W comes into contact with the inside of the reel housing 2, causing friction and wear at certain parts of the reel housing 2.

[0045] Here, the theoretical equation for wear is given by the following equation (2). W = K P V T (2)

[0046] In the above formula (2), W is the estimated wear dimension, K is the specific wear rate, P is the load surface pressure, V is the sliding speed, and T is the friction time.

[0047] As is clear from the above formula (2), the amount of wear K correlates with the load surface pressure P and the sliding speed V. This shows that the higher the load surface pressure P x ​​sliding speed V (hereinafter referred to as PV value), the more likely the machine, including the reel housing unit 2, is to wear out. Therefore, in this embodiment, wear prevention parts 300 are provided at positions in the reel housing unit 2 that are prone to wear to protect them. Positions in the reel housing unit 2 that are prone to wear are, for example, as follows:

[0048] 3 and 6A, at position P1 near the entrance 22c of the reel housing 2, the moving speed of the wire W is fast, but the force in the return direction is large, and the pressure at which the wire W contacts the reel housing 2, the load surface pressure P, is relatively small. However, the contact of the wire W with the reel housing 2 causes some wear on the reel housing 2, etc.

[0049] Furthermore, at the upstream side of position P1 in the reel housing portion 2, specifically at position P2 on the lower side in the reel housing portion 2, the wire W spreads out toward the outer periphery of the reel 26 and comes into contact with the inner periphery 22a1 of the reel housing portion 2, etc. At position P2, the wire W also moves faster when returning. Therefore, the PV value is the largest, and the amount of wear in the reel housing portion 2, etc. is also large.

[0050] Furthermore, the return speed of the wire W gradually decreases upstream of position P2 in the reel housing portion 2, specifically at position P3 at approximately the same height as the hub portion 26a of the reel 26 in the reel housing portion 2. Therefore, the PV value decreases, and the amount of wear at the reel housing portion 2 etc. is less than at the second position P2.

[0051] Therefore, in this embodiment, wear prevention parts 300 made of, for example, hard plates are provided at positions including the second path 90b and the first position P1, the second position P2, and the third position P3 in the reel housing part 2. As shown in Fig. 4 and Fig. 6A, the wear prevention part 300 has a first plate 301 provided on the inner circumferential surface 22a1 of the reel housing part 2, a second plate 302 provided on the side wall 10c constituting the second path 90b, and a third plate 303 provided across the bottom wall 10b constituting the second path 90b and the inside of the reel housing part 2.

[0052] The wear prevention portion 300 may be provided only at the second position P2 where the amount of wear is greatest, or may be provided only at the second position P2 and the third position P3 where the amount of wear is the first and second greatest. The thickness of the wear prevention portion 300 may be adjusted to be gradually thinner in descending order of the amount of wear. In the present embodiment, the material of the wear prevention portion 300 is a hard plate, but this is not limited thereto, and any material that can prevent wear caused by the wire W may be appropriately used. Furthermore, the wear prevention portion 300 is formed of a separate material from the reel housing portion 2, but the reel housing portion 2 itself may be formed of a material with high hardness.

[0053] <Example of operation of rebar binding machine 1A> Next, with reference to each drawing, an operation of the reinforcing bar binding machine 1A for binding reinforcing bars S with one wire W will be described. In the reinforcing bar binding machine 1A, the wire W is clamped by the wire feeding unit 3, and the waiting state is a state in which the tip of the clamped wire W is located between the wire feeding unit 3 and the cutting unit 6, or a state in which the tip of the wire W is located at the cutting unit 6.

[0054] When the reinforcing bar S to be bundled is inserted between the curl guide 50 and the induction guide 51 of the curl forming unit 5 and the trigger 12 is operated, the feed motor 30 is driven in the forward rotation direction and the wire feed unit 3 rotates forward. This feeds the wire W in the forward direction. In this embodiment, the guide unit 100A is provided between the wire feed unit 3 and the curl forming unit 5, so that friction between the wire W and the guide unit 100A during feeding can be reduced, and the load resistance of the wire W is reduced.

[0055] When the wire W is fed in the forward direction, the wire W passes through the tip of the locking member 70 and then passes through the curl guide 50 of the curl forming unit 5. As a result, the wire W is curled by the first guide pin 53a and the second guide pin 53b, etc.

[0056] The wire W having been curled by the curl guide 50 is guided by the induction guide 51 and is further fed in the forward direction by the wire feed unit 3, passing through the tip of the locking member 70 and abutting against the feed regulating unit 9. The driving of the feed motor 30 is stopped.

[0057] After the forward feeding of the wire W is stopped, the torsion motor 80 is driven in the forward direction. The rotation of the torsion motor 80 is converted into linear movement via the torsion shaft 72 etc., and the operating member 71 moves forward. When the operating member 71 moves forward, a part of the wire W before passing through the curl forming unit 5 is gripped by the locking member 70 in a movable state, and the wire W after passing through the curl forming unit 5 is gripped by the locking member 70 in a state where it cannot come off the locking member 70.

[0058] 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.

[0059] Next, the rotation of the torsion motor 80 is temporarily stopped, and the feed motor 30 is driven in reverse rotation. This causes the wire feed unit 3 to rotate in reverse, and the wire W clamped by the wire feed unit 3 is fed in the reverse direction. Since the tip of the wire W is gripped by the locking member 70, the wire W is wound around the reinforcing bar S in close contact with the reinforcing bar S.

[0060] In this embodiment, since the buckling prevention portion 200 is provided in the second path 90b, a part of the wire W fed in the reverse direction when the wire W returns is supported by the support portion 203. This makes it possible to increase the buckling load of the wire W, thereby preventing buckling of the wire W in the second path 90b. Furthermore, since the wear prevention portion 300 is provided in the reel housing portion 2, wear of the wire W due to contact with the reel housing portion 2 is prevented even if the wire W fed in the reverse direction spreads out in the outer circumferential direction of the reel 26.

[0061] After the feed motor 30 is stopped, the torsion motor 80 is driven in the forward direction, causing the operating member 71 to move forward, and the wire W held by the locking member 70 is cut by the action of the fixed blade portion 60 and the movable blade portion 61.

[0062] After the wire W is cut, each end of the wire W is bent toward the rebar S. After the end of the wire W is bent, the torsion motor 80 is further driven in the forward direction, whereby the operating member 71 rotates in conjunction with the torsion shaft 72, and the locking member 70 holding the wire W rotates integrally with the operating member 71, thereby twisting the wire W.

[0063] As described above, according to this embodiment, the reel housing 2 is provided behind the trigger 12, specifically at the rear of the main body 10, so that even when tying an object with a complex structure, the reel housing 2 does not become an obstacle and the object can be smoothly inserted between the curl guide 50 and the induction guide 51. This allows the rebar tying machine 1A to be used for tying objects with various structures.

[0064] Furthermore, according to this embodiment, even if the reel housing 2 is provided at the rear of the main body 10, the first path 90a having the bent portion is configured by the guide portion 100A, so that it is possible to reduce the load resistance of the wire W to the first path 90a when feeding and returning the wire W. This makes it possible to prevent the wire W from slipping in the wire feed portion 3, and thus to prevent poor transport of the wire W.

[0065] Furthermore, according to this embodiment, since the buckling prevention section 200 is provided in the second path 90b, a part of the wire W can be supported by the support section 203 when the wire W is returned. This allows the load applied to the wire W to be distributed and reduced, so that buckling in the rebar binding machine 1A when the wire W is returned can be prevented, and poor binding and machine failure can be avoided.

[0066] Furthermore, according to this embodiment, since the wear prevention part 300 is provided inside the reel housing part 2, it is possible to prevent wear caused by the wire W contacting the inner peripheral surface 22a1 of the reel housing part 2 when the wire W is returned. This makes it possible to improve the durability of the reinforcing bar binding machine 1A including the reel housing part 2.

[0067] Furthermore, according to this embodiment, the reel housing 2 is offset relative to the wire feed unit 3 in the axial direction of the reel 26 and to the left of the torsion motor 80, so that the transport path of the wire W becomes an oblique direction from the wire feed unit 3 to the reel 26, and the trajectory of the wire W when returned can be made to be in a constant direction. This makes it possible to limit the buckling points of the wire W and the wear points of the reel housing 2, etc., and to identify the locations of the buckling prevention unit 200 and the wear prevention unit 300.

[0068] <First Modification> Next, a description will be given of the guide part 100B of the reinforcing bar binding machine 1A according to the first modified example. Fig. 9A is a diagram showing the guide part 100B according to the first modified example.

[0069] 9A, the guide portion 100B is provided in a first path 90a formed between the wire feed portion 3 and the cutting portion 6, and guides the wire W when feeding the wire W to the curl forming portion 5 and when pulling back the wire W fed to the curl forming portion 5. The first path 90a is formed of a side wall made of, for example, a resin material or a metal material, and has a bent portion that curves from the wire feed portion 3 toward the cutting portion 6. The first path 90a may be formed of a pipe, similar to the above-mentioned guide portion 100A.

[0070] The guide portion 100B has hard pins 120a, 120b, and 120c provided in the first path 90a. The hard pins 120a, 120b, and 120c are, for example, cylindrical bodies and are formed of a hard material such as stainless steel. Both ends of the hard pins 120a, 120b, and 120c in the longitudinal direction are attached to left and right side walls (not shown) of the main body 10. The material of the hard pins 120a, etc. is not limited to stainless steel, and any known material can be used as long as it is a hard material.

[0071] The rigid pins 120a, 120b are disposed at a predetermined interval on the lower surface side of the first path 90a. The rigid pin 120c is located on the upper surface side of the first path 90a, between the rigid pins 120a and 120b. Parts of the circumferential surfaces of the rigid pins 120a, 120b, 120c are exposed in the first path 90a and can come into contact with the wire W passing through the first path 90a. The guide unit 100B can also achieve the same effect as the above-mentioned guide unit 100A.

[0072] <Second Modification> Next, a guide part 100C of the reinforcing bar binding machine 1A according to the second modified example will be described. Fig. 9B is a diagram showing the guide part 100C according to the second modified example. Details of the contents common to the first modified example described above will be omitted.

[0073] As shown in FIG. 9B, the guide unit 100C is provided in the first path 90a formed between the wire feed unit 3 and the cutting unit 6, and guides the wire W when feeding the wire W to the curl forming unit 5 and when pulling back the wire W fed to the curl forming unit 5. The guide unit 100C has rollers 130a, 130b, and 130c provided in the first path 90a. The rollers 130a, 130b, and 130c are, for example, cylindrical bodies made of a hard material such as steel or stainless steel. The rollers 130a, 130b, and 130c include a shaft, and both ends of the shaft in the longitudinal direction are rotatably supported on the left and right side walls of the main body 10, respectively.

[0074] The rollers 130a and 130b are disposed below the first path 90a with a predetermined gap therebetween. The roller 130c is located above the first path 90a between the rollers 130a and 130b. Parts of the circumferential surfaces of the rollers 130a, 130b, and 130c are exposed within the first path 90a and can come into contact with the wire W passing through the first path 90a. The guide unit 100C can also achieve the same effect as the above-mentioned guide unit 100A.

[0075] <Third Modification> Next, an example of the arrangement of the wire feed unit 3 and the guide unit 100A of the rebar binding machine 1A according to the third modified example will be described. Fig. 10A is a diagram showing an example of the arrangement of the wire feed unit 3 and the guide unit 100A according to the third modified example. In Fig. 10A, the conveying path that runs from the reel housing unit 2 through the lower side of the main body 10 is called the lower path 90d, the conveying path that is provided downstream of the lower path 90d and has a bent portion is called the curved path 90e, and the conveying path between the downstream side of the curved path 90e and the cutting unit 6 is called the intermediate path 90f.

[0076] 10A, the guide portion 100A is disposed between the downstream side of the lower path 90d and the curved path 90e. The wire feed portion 3 is disposed in the intermediate path 90f downstream of the guide portion 100A. Note that the guide portion 100B or the guide portion 100C may be used instead of the guide portion 100A.

[0077] <Fourth Modification> Next, an example of the arrangement of the wire feed unit 3 and the guide unit 100A of the reinforcing bar binding machine 1A according to the fourth modified example will be described. Fig. 10B is a diagram showing an example of the arrangement of the wire feed unit 3 and the guide unit 100A according to the fourth modified example. Details of the contents common to the third modified example will be omitted.

[0078] As shown in Fig. 10B, the guide portion 100A is disposed in two locations, one downstream of the lower path 90d and one on the intermediate path 90f. The wire feed portion 3 is disposed in the curved path 90e between the two guide portions 100A, 100A. Note that the guide portion 100B or the guide portion 100C may be used instead of the guide portion 100A.

[0079] <Fifth Modification> Next, an example of the arrangement of the wire feed unit 3 and the guide unit 100A of the reinforcing bar binding machine 1A according to the fifth modified example will be described. Fig. 10C is a diagram showing an example of the arrangement of the wire feed unit 3 and the guide unit 100A according to the fifth modified example. Details of the contents common to the third modified example will be omitted.

[0080] As shown in Fig. 10C, the guide portion 100A is disposed in two locations, extending between the curved path 90e and the intermediate path 90f, and is also disposed in a portion of the lower path 90d. The wire feed portion 3 is disposed downstream of the lower path 90d, between the two guide portions 100A, 100A. Note that the guide portion 100B or the guide portion 100C may be used instead of the guide portion 100A.

[0081] <Sixth Modification> Next, an example of the arrangement of the wire feed unit 3 and the guide unit 100A of the reinforcing bar binding machine 1A according to the sixth modified example will be described. Fig. 10D is a diagram showing an example of the arrangement of the wire feed unit 3 and the guide unit 100A according to the sixth modified example. Details of the contents common to the third modified example will be omitted.

[0082] As shown in Fig. 10D, the guide unit 100A is disposed at two locations, one upstream of the lower path 90d, and the other extending from the approximate middle of the lower path 90d through the curved path 90e to the middle path 90f. The wire feed unit 3 is disposed on the lower path 90d between the two guide units 100A, 100A. Note that instead of the guide unit 100A, the guide unit 100B or the guide unit 100C may be used.

[0083] <Seventh Modification> Next, an example of the arrangement of the wire feed unit 3 and the guide unit 100A of the reinforcing bar binding machine 1A according to the seventh modified example will be described. Fig. 10E is a diagram showing an example of the arrangement of the wire feed unit 3 and the guide unit 100A according to the seventh modified example. Details of the contents common to the third modified example will be omitted.

[0084] As shown in Fig. 10E, the guide unit 100A is disposed at two locations, one downstream of the lower path 90d and one on the curved path 90e. The wire feed unit 3 is disposed at two locations, one downstream of the lower path 90d, between the two guide units 100A, 100A, and one on the intermediate path 90f. Note that the guide unit 100B or the guide unit 100C may be used instead of the guide unit 100A.

[0085] <Eighth Modification> FIG. 11 is a side view showing a reinforcing bar binding machine 1B according to the eighth modified example, and FIG. 12 is a perspective view showing the reinforcing bar binding machine 1B. Components having substantially the same functional configuration as the reinforcing bar binding machine 1A described above are given the same reference numerals to avoid repeated explanation. In the eighth modified example, the longitudinal direction of the main body 10 is defined as the front-rear direction, the side where the curl forming section 5 is provided is defined as the front or tip side of the reinforcing bar binding machine 1B, and the side where the reel housing section 2 is provided is defined as the rear side of the reinforcing bar binding machine 1B. In addition, the side where the battery 15 is provided in the direction perpendicular to the front-rear direction is defined as the lower side of the reinforcing bar binding machine 1B, and the opposite side is defined as the upper side of the reinforcing bar binding machine 1B.

[0086] Grip 11 extends substantially downward from the lower surface, which is a part of the circumferential surface of main body 10, at a substantially intermediate portion in the longitudinal direction of main body 10. In other words, grip 11 is provided below torsion axis 72 extending in the front-rear direction of main body 10, and is disposed on the opposite side of conveying path 90 for wire W provided within main body 10 via torsion axis 72. Curl guide 50 is disposed below torsion axis 72, and is disposed on the same side as grip 11 with respect to torsion axis 72. Conveying path 90 is disposed above torsion axis 72, at the upper side within main body 10.

[0087] Similarly to the reinforcing bar binding machine 1A described above, the conveying path 90 can be provided with guide units 100A, 100B, 100C, a buckling prevention unit 200, and an abrasion prevention unit 300. The reinforcing bar binding machine 1B according to the eighth modified example can also achieve the same effects as the reinforcing bar binding machine 1A described above.

[0088] Although the preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, the technical scope of the present disclosure is not limited to such examples. Any technical idea that a person having ordinary knowledge in the technical field of the present disclosure can come up with various modified or amended examples within the scope of the technical idea described in the claims belongs to the technical scope of the present disclosure.

[0089] For example, in the above embodiment, a reinforcing bar binding machine 1A and the like of a type that retracts the wire W after wrapping the wire W around an object to be bound has been described, but the present invention is not limited to this. For example, the technology of arranging the reel housing at the rear of the main body, which is the present embodiment, can be applied to a reinforcing bar binding machine of a type that does not retract the wire W after wrapping the wire W around an object to be bound. [Explanation of symbols]

[0090] 1A,1B Rebar binding machine (binding machine) 2 Reel storage section 3 Wire feed section 5 Curl forming section 7 Binding part 10. Main Unit 11 Grip 12 Trigger (startup part) 26 Reels 72 Torsion shaft 90 Transport Route 90a First route (first transport route) 90b Second route (second transport route) 100A, 100B, 100C Guide section (load reduction section) 200 Buckling prevention section (load reduction section) 300 Wear prevention part (load reduction part) S Reinforced concrete (bundled) W Wire

Claims

1. A reinforcing bar binding machine that feeds a wire in a first direction to cause a curl to surround an object to be bound with the wire, and then returns the wire in a second direction opposite to the first direction to wind the wire around the object to be bound, and twists the wire to bind the object to be bound, The main body, a wire feeding section provided in the main body and configured to feed the wire in a first direction and a second direction; a curl forming unit provided at a tip end side of the main body and configured to curl the wire fed by the wire feeding unit; a bundling section including a torsion shaft extending across a front end side and a rear end side of the main body, the bundling section twisting the wire curled by the curl forming section by rotating the torsion shaft; a first conveying path provided between the bundling unit and the wire feeding unit; a second conveying path extending from the wire feeding portion toward the rear side of the main body; Equipped with the first conveying path is formed in a pipe shape and includes a bending portion that is bent from a feeding direction of the wire fed by the wire feeding portion toward the curl forming portion, the bending portion has a load reducing portion that reduces a load on the wire, The load reducing portion is provided at the bent portion and includes a pin or a roller having a peripheral surface partially exposed within the pipe-shaped first conveying path. Binding machine.

2. The first conveying path and the curl forming section are arranged on opposite sides of the torsion axis. The strapping machine according to claim 1.

3. a cutting unit provided in the main body and configured to cut the wire wound around the bundle by the wire feeding unit; The bending section is provided between the cutting section and the wire feeding section. The strapping machine according to claim 1.

4. The pins or rollers are provided in a plurality of the bending portion, and are arranged so as to sandwich the first transport path, and the number of the pins or rollers provided on the inside of the bending portion is smaller than the number of the pins or rollers provided on the outside of the bending portion. The strapping machine according to claim 1.

5. Two of the pins or rollers are disposed on the outer side of the bent portion, and one is disposed on the inner side of the bent portion, The one disposed on the inside is disposed between the two disposed on the outside. The binding machine according to claim 4.

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