Binding machine

Abstract

To provide a reinforcement bar binding machine capable of restraining any of a plurality of wires from moving in a direction of other wires in a curl guide.SOLUTION: A reinforcement bar binding machine comprises a curl guide 50a that curls two wires W fed by a wire feed section. The curl guide 50a comprises: a first wire guide 51 that regulates a position of the wire W heading for an outer peripheral side in a radial direction with respect to a radial direction of an annular feed path; a second wire guide 52 that regulates a position of the wire W heading for one side in an axial direction with respect to the axial direction of the annular feed path; and a third wire guide 53 that regulates a position of the wire W heading for the other side in the axial direction. Further, the curl guide 50a comprises a restraining section 54 that restrains one wire W of the two wires aligned between the second wire guide 52 and the third wire guide 53 along the axial direction of the annular feed path from moving in a direction of the other wire W.SELECTED DRAWING: Figure 1A

Description

Technical Field

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

Background Art

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

[0003] Conventionally, a bundling machine called a reinforcing bar bundling machine has been proposed, which winds a wire around two or more reinforcing bars and twists the wire wound around the reinforcing bars to bundle the two or more reinforcing bars with the wire.

[0004] When bundling reinforcing bars with a wire, if the bundling is loose, the reinforcing bars will shift from each other, so it is required to firmly bundle and hold the reinforcing bars together. By using a wire with a large diameter, the bundling strength of the reinforcing bars can be ensured. However, when using a wire with a large diameter, the rigidity of the wire increases, so a large force is required for bundling the reinforcing bars.

[0005] Therefore, there is provided a feeding means capable of feeding two or more wires and winding them around an object to be bundled, and a bundling means for bundling the object to be bundled by gripping and twisting two or more wires wound around the object to be bundled by the feeding means. The feeding means has been proposed to feed two or more wires in parallel in the axial direction of an annular wire feeding path (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In a bundling machine that feeds two or more wires in parallel, if any one of the plurality of wires moves in the direction of another wire within a curl guide that imparts a curl to the wire, it affects the posture of the wire in the air after it is fed out from the curl guide. If the posture of the wire in the air varies, the landing points on a guide that guides the wire to a bundling means vary.

[0008] When the diameter of the reinforcing bar to be bundled with the wire increases, it is necessary to increase the diameter of the feeding path of the wire wound annularly around the reinforcing bar. However, the variation in the landing points on the guide expands as the diameter of the annular feeding path increases. For this reason, there is a possibility that the wire may not enter the guide. On the other hand, if the guide is enlarged so that the wire enters the guide, the size of the bundling machine may increase, or the weight of the bundling machine may increase, which may deteriorate the operability.

[0009] The present disclosure has been made to solve such problems, and an object thereof is to provide a bundling machine capable of suppressing any one of a plurality of wires from moving in the direction of another wire within a curl guide.

Means for Solving the Problems

[0010] In order to solve the above-described problems, the present disclosure provides a wire feeding unit that feeds a plurality of wires, a curl forming unit that forms an annular feeding path for winding the plurality of wires fed by the wire feeding unit around a bundle, and a bundling unit that twists the plurality of wires wound around the bundle. The curl forming unit includes a curl guide that imparts a curl to the plurality of wires fed by the wire feeding unit, and a guiding guide that guides the plurality of wires imparted with a curl by the curl guide to the bundling unit. The curl guide includes a first wire guide that regulates the position of the wire toward the outer peripheral side in the radial direction with respect to the radial direction of the annular feeding path, a second wire guide that regulates the position of the wire toward one side in the axial direction with respect to the axial direction of the annular feeding path, and a third wire guide that regulates the position of the wire toward the other side in the axial direction. The curl guide includes a suppressing unit that enables the plurality of wires to be arranged side by side between the second wire guide and the third wire guide along the axial direction of the annular feeding path while being in contact with each other, and suppresses movement of one wire among the plurality of wires in the direction of the other wires. It is a bundling machine provided with.

[0011] In the present disclosure, movement of one wire among the plurality of wires fed from the wire feeding unit to the curl forming unit and arranged side by side between the second wire guide and the third wire guide along the axial direction of the annular feeding path in the direction of the other wires is suppressed by the suppressing unit.

Effect of the Invention

[0012] In the present disclosure, by suppressing movement of one wire among the plurality of wires arranged side by side between the second wire guide and the third wire guide in the direction of the other wires, it is possible to suppress an exchange in the order in which the plurality of wires arranged along the axial direction of the annular feeding path are arranged. As a result, the posture of the wire in the air after being sent out from the curl guide can be stabilized. Therefore, even if the diameter of the annular feeding path increases, the plurality of wires can be sent from the curl guide to enter the guiding guide without increasing the guiding guide. Therefore, it is possible to suppress an increase in the size and weight of the bundling machine and to suppress a deterioration in operability.

Brief Description of the Drawings

[0013]

Figure 1A

Figure 1B

Figure 1C

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 3D

Figure 4

Figure 5A

Figure 5B

Figure 6

Figure 7

Figure 8A

Figure 8B

Figure 8C

Embodiments for Carrying Out the Invention

[0014] Hereinafter, with reference to the drawings, an example of a steel bar bundling machine as an embodiment of the bundling machine of the present disclosure will be described.

[0015] <Configuration Example of Rebar Tying Machine of Present Embodiment> FIG. 1A is an internal configuration diagram viewed from the side showing an example of the overall configuration of the rebar tying machine of the present embodiment, FIG. 1B is an internal configuration diagram viewed from the front showing an example of the overall configuration of the rebar tying machine of the present embodiment, and FIG. 1C is a side view showing an example of the overall configuration of the rebar tying machine of the present embodiment.

[0016] The rebar tying machine 1A is in a form that can be held and used by an operator, and includes a main body portion 10 and a handle portion 11. Further, the rebar tying machine 1A feeds the wire W in the positive direction indicated by the arrow F, winds it around the rebar S which is the object to be tied, sends the wire W wound around the rebar S in the reverse direction indicated by the arrow R and winds it around the rebar S, then twists the wire W to tie the rebar S with the wire W. The rebar tying machine 1A ties the rebar S with a plurality of wires W, in this example, two wires W.

[0017] In order to realize the above-described functions, the rebar tying machine 1A includes a magazine 2 in which the wire W is accommodated, a wire feeding portion 3 that feeds two wires W side by side in the radial direction of the wire W, and a wire guiding portion 4 that guides the two wires W fed to the wire feeding portion 3. Further, the rebar tying machine 1A includes a curl forming portion 5 that forms an annular feeding path for winding the two wires W fed by the wire feeding portion 3 around the rebar S, and a cutting portion 6 that cuts the two wires W wound around the rebar S. Furthermore, the rebar tying machine 1 includes a tying portion 7 that twists the two wires W wound around the rebar S, and a driving portion 8 that drives the tying portion 7.

[0018] The magazine 2 is an example of an accommodating portion, and a reel 20 around which a long wire W is wound so as to be payed out rotatably and detachably accommodated. The wire W is a wire made of a metal wire that can be plastically deformed, a wire in which the metal wire is coated with resin, or a stranded wire.

[0019] 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 formed in a substantially disc shape with a diameter larger than that of the hub portion 21, and are provided concentrically with the hub portion 21. Two wires W are wound around the hub portion 21 of the reel 20, and two wires W can be pulled out from the reel 20 simultaneously.

[0020] As shown in FIG. 1B, the reinforcing bar bundling machine 1A has the reel 20 mounted in an offset state in one direction along the axial direction of the reel 20 along the axial direction of the hub portion 21 with respect to the feeding path FL of the wire W defined by the wire feeding portion 3 and the wire guiding portion 4 and the like.

[0021] The wire feeding portion 3 includes a pair of feeding gears 30 (30L, 30R) that sandwich and feed two parallel wires W. In the wire feeding portion 3, the rotational operation of the feeding motor 31 is transmitted to one of the feeding gears 30L. Further, the rotational operation of one of the feeding gears 30L is transmitted to the other feeding gear 30R by the meshing of the gear portions provided on the outer circumferences of the feeding gear 30L and the feeding gear 30R. Thereby, one of the feeding gears 30L becomes the driving side and the other feeding gear 30R becomes the driven side.

[0022] The wire feeding portion 3 aligns the two wires W in parallel along the direction in which the pair of feeding gears 30L, 30R are arranged. In the wire feeding portion 3, one wire W contacts the groove portion of one feeding gear 30L, the other wire W contacts the groove portion of the other feeding gear 30R, and the one wire W and the other wire W contact each other. Thereby, the wire feeding portion 3 feeds the two wires W sandwiched between the pair of feeding gears 30 (30L, 30R) along the extending direction of the wire W due to the frictional force generated between one feeding gear 30L and one wire W, the frictional force generated between the other feeding gear 30R and the other wire W, and the frictional force generated between the two wires W.

[0023] Further, the wire feeding section 3 switches the forward and reverse directions of the rotation of the feeding motor 31, thereby switching the rotation direction of the feeding gear 30 and switching the forward and reverse directions of the feeding direction of the wire W.

[0024] The wire guide section 4 is disposed on the upstream side and the downstream side of the feeding gear 30 with respect to the feeding direction of the wire W fed in the forward direction. The wire guide section 4A guides the two wires W that have entered along the direction in which the pair of feeding gears 30 are arranged in parallel and guides them between the pair of feeding gears 30.

[0025] The wire guide section 4A is configured such that the opening area of the upstream opening is larger than that of the downstream opening with respect to the feeding direction of the wire W fed in the forward direction, and a part or all of the inner surface of the opening is tapered. Thereby, the operation of inserting the wire W drawn from the reel 20 stored in the magazine 2 into the wire guide section 4 can be easily performed.

[0026] The curl forming section 5 winds the two wires W fed by the wire feeding section 3, and includes a curl guide 50a that restricts the movement of each wire W in the direction in which the two wires W are arranged in parallel, and a guide guide 50b that guides the two wires W wound by the curl guide 50a to the binding section 7. The curl forming section 5 forms an annular feed path Ru as shown by the two-dot chain line in FIG. 1A that passes through the guide guide 50b from the curl guide 50a and reaches the binding section 7 by winding the two wires W fed by the wire feeding section 3 and passing through the curl guide 50a. The curl guide 50a suppresses the movement of one of the two wires W in the direction of the other wire. Further, the curl guide 50a suppresses the movement of the other wire W in the direction of one wire by one of the two wires W. Thereby, the curl guide 50a suppresses the order of the two wires W fed by the wire feeding section 3 from being switched so as to be arranged along the axial direction of the annular feed path Ru.

[0027] The cutting portion 6 includes a fixed blade portion 60, a movable blade portion 61 that cuts the wire W in cooperation with the fixed blade portion 60, and a transmission mechanism 62 that transmits the operation of the bundling portion 7 to the movable blade portion 61.

[0028] The bundling portion 7 includes a wire locking body 70 to which the wire W is locked and a sleeve 71 that operates the wire locking body 70. The drive portion 8 includes a torsion motor 80 and a speed reducer 81 that performs speed reduction and torque amplification.

[0029] The steel bar bundling machine 1A includes a feed regulation portion 90 against which the tip of the wire W abuts at the end of the feed path of the wire W locked by the wire locking body 70 through the annular feed path Ru. Further, in the steel bar bundling machine 1A, the curl guide 50a and the guide guide 50b of the curl forming portion 5 described above are provided at the front end portion of the main body portion 10. Furthermore, in the steel bar bundling machine 1A, an abutting portion 91 against which the steel bar S abuts is provided between the curl guide 50a and the guide guide 50b at the front end portion of the main body portion 10.

[0030] In the steel bar bundling machine 1A, the handle portion 11 extends downward from the main body portion 10. Further, a battery 15 is detachably attached to the lower portion of the handle portion 11. Also, in the steel bar bundling machine 1A, the magazine 2 is provided in front of the handle portion 11.

[0031] In the steel bar bundling machine 1A, a trigger 12 is provided on the front side of the handle portion 11, and a switch 13 is provided inside the handle portion 11. The steel bar bundling machine 1A controls the feed motor 31 and the torsion motor 80 according to the state of the switch 13 pushed by the operation of the trigger 12 by the control unit 100.

[0032] <Main part configuration example of the steel bar bundling machine of the present embodiment> · Configuration example of curl guide FIG. 2 is a side view with some components removed showing an example of a curl guide, FIG. 3A is a side view showing an example of a curl guide, FIG. 3B is a cross-sectional view taken along line B-B of FIG. 3A, FIG. 3C is a cross-sectional view taken along line C-C of FIG. 3A, and FIG. 3D is a top view showing an example of a curl guide. FIG. 2 shows a state where the second wire guide 52 described later is removed. Next, an example of the curl guide 50a will be described with reference to each figure.

[0033] The curl guide 50a includes a first wire guide 51 that regulates the position of the wire W toward the outer peripheral side in the radial direction with respect to the radial direction of the annular feed path Ru indicated by arrow D1 in FIG. 2 along the circumferential direction of the annular feed path Ru indicated by arrow D2.

[0034] Also, the curl guide 50a includes a second wire guide 52 that regulates the position of the wire W toward one side in the axial direction with respect to the axial direction of the annular feed path Ru indicated by arrow D3 in FIGS. 3B and 3C along the circumferential direction of the annular feed path Ru indicated by arrow D2.

[0035] Furthermore, the curl guide 50a includes a third wire guide 53 that regulates the position of the wire W toward the other side in the axial direction with respect to the axial direction of the annular feed path Ru indicated by arrow D3 along the circumferential direction of the annular feed path Ru indicated by arrow D2.

[0036] In the curl guide 50a, the first wire guide 51 is sandwiched between the second wire guide 52 and the third wire guide 53. The second wire guide 52 protrudes inward along the radial direction of the annular feed path Ru from the first wire guide 51. The third wire guide 53 protrudes inward along the radial direction of the annular feed path Ru from the first wire guide 51. Thereby, in the curl guide 50a, the second wire guide 52 and the third wire guide 53 face each other with a gap equal to the thickness of the first wire guide 51. The gap Ra1 between the second wire guide 52 and the third wire guide 53 is equal to or greater than twice the diameter R of the wire W.

[0037] Incidentally, the distance Ra1 between the second wire guide 52 and the third wire guide 53 may be set to about 1.5 times or more the diameter R of the wire W. Further, in order to enable the two wires W to be in contact with each other and arranged along the axial direction of the annular feed path Ru, the distance Ra1 between the second wire guide 52 and the third wire guide 53 is preferably about 1.9 times or more the diameter R of the wire W.

[0038] The curl guide 50a is configured such that the first wire guide 51, the second wire guide 52, and the third wire guide 53 do not bend in the axial direction of the annular feed path Ru indicated by the arrow D3, and the entirety of the first wire guide 51, the second wire guide 52, and the third wire guide 53 extends linearly toward the discharge portion 50e from which the wire W fed in the positive direction by the wire feed portion 3 is discharged. The curl guide 50a includes a guide member 50g at the discharge portion 50e. The guide member 50g is, for example, cylindrical. The second wire guide 52 includes a hole portion 52h into which the guide member 50g is press-fitted. The third wire guide 53 includes a hole portion 53h into which the guide member 50g is press-fitted. Further, the first wire guide 51 includes a recess portion 51h into which the guide member 50g fits. When the first wire guide 51 is sandwiched between the second wire guide 52 and the third wire guide 53 in the curl guide 50a, the positions of the hole portion 52h, the hole portion 53h, and the recess portion 51h are aligned. Then, the guide member 50g passes through the hole portion 52h and the hole portion 53h and is press-fitted into the curl guide 50a, so that the circumferential surface of the guide member 50g is exposed on the guide surface by the first wire guide 51.

[0039] The curl guide 50a includes a restraining portion 54 that restrains one wire W1 (in this example, one of the two wires W) among the plurality of wires W from moving in the direction of the other wire W2. The restraining portion 54 includes a guide portion 54a having different heights along the radial direction of the annular feed path indicated by the arrow D1 in the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3.

[0040] The guide portion 54a is provided on the first wire guide 51. In the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3, the guide portion 54a includes an inclined surface 54b that inclines outward along the radial direction of the annular feed path Ru indicated by the arrow D1 toward the second wire guide 52, which is on the side opposite to the side where the reel 20 is offset. Further, in the circumferential direction of the annular feed path Ru indicated by the arrow D2, the guide portion 54a is configured by a concave curved surface or the like that follows the annular feed path Ru.

[0041] The curl guide 50a includes a parallel guide portion 55 that feeds two wires W in parallel along the axial direction of the annular feed path Ru indicated by the arrow D3. The parallel guide portion 55 is provided on the first wire guide 51 on the downstream side of the suppression portion 54 with respect to the feed direction of the wire W fed in the positive direction indicated by the arrow F. In the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3, the parallel guide portion 55 is configured by a surface along the axial direction of the annular feed path Ru. The surface along the axial direction of the annular feed path Ru is a surface along the direction in which the guide member 50g extends. Further, in the circumferential direction of the annular feed path Ru indicated by the arrow D2, the parallel guide portion 55 is configured by a concave curved surface or the like that follows the annular feed path Ru. Also, a part of the parallel guide may be configured by the circumferential surface of the cylindrical guide member 50g.

[0042] The height of the suppression portion 54 along the radial direction of the annular feed path Ru indicated by the arrow D1 gradually changes toward the parallel guide portion 55. That is, the guide portion 54a gradually decreases in inclination from the upstream side to the downstream side and connects to the parallel guide portion 55 with respect to the feed direction of the wire W fed in the positive direction indicated by the arrow F.

[0043] The suppression unit 54 is preferably provided in at least a 1 / 4 range of the annular feed path Ru in the circumferential direction of the annular feed path Ru indicated by the arrow D2. Further, the suppression unit 54 is preferably provided on the upstream side of the curl guide 50a with respect to the feed direction of the wire W fed in the positive direction indicated by the arrow F. The range where the guide portion 54a is provided is about half the length of the curl guide 50a in the circumferential direction of the annular feed path Ru indicated by the arrow D2.

[0044] ·Examples of the effects of the curl guide When the trigger 12 of the steel bar tying machine 1A is operated, the feed motor 31 is driven in the forward rotation direction, and the two wires W are fed in the positive direction indicated by the arrow F by the wire feed unit 3.

[0045] The two wires W fed in the positive direction by the wire feed unit 3 are arranged in parallel along the axial direction of the annular feed path Ru by the wire guide portion 4 on the upstream side of the curl guide 50a.

[0046] The two wires W fed in the positive direction are fed to the curl guide 50a of the curl forming unit 5. The two wires W come into contact with the first wire guide 51 by passing through the curl guide 50a, and are given a winding habit of being wound around the steel bar S along the annular feed path Ru.

[0047] In order to facilitate the operation when the two wires W wound around the reel 20 are inserted between the pair of feed gears 30, in the state before use, their tips are twisted, crimped, etc., and are integrally connected.

[0048] The two wires W guided to the curl guide 50a are defined in a parallel direction by the pair of feed gears 30 and the wire guide portion 4 of the wire feed unit 3.

[0049] If the distance Ra1 between the second wire guide 52 and the third wire guide 53 is equal to or more than twice the diameter of the wire W, the tip portion where the two wires W are integrally connected can be inserted between the second wire guide 52 and the third wire guide 53 by the operation of feeding the wire W by the wire feed 3.

[0050] In addition, if the distance Ra1 between the second wire guide 52 and the third wire guide 53 is equal to or more than 1.5 times the diameter of the wire W, the tip portion where the two wires W are integrally connected is inclined with respect to the axial direction of the annular feed path Ru indicated by the arrow D3 and can be inserted between the second wire guide 52 and the third wire guide 53.

[0051] The two wires W passing through the curl guide 50a in parallel along the axial direction of the annular feed path Ru indicated by the arrow D3 are in contact with the guide portion 54a on the upstream side of the curl guide 50a as shown in Fig. 3B.

[0052] When one wire W1 passing through the side closer to the second wire guide 52 contacts the guide portion 54a in the process of feeding the wire W by the wire feed unit 3, the movement of the wire W1 in the direction of the third wire guide 53 indicated by the arrow D31 is suppressed by the inclined surface 54b of the guide portion 54a.

[0053] As a result, the movement of one wire W1 in the direction of the other wire W2 passing through the side closer to the third wire guide 53 is suppressed, and the positions of the two wires W are prevented from being interchanged between the second wire guide 52 and the third wire guide 53.

[0054] Further, a force is applied to one wire W1 to move it in the direction of the second wire guide 52 indicated by the arrow D32 by the inclined surface 54b of the guide portion 54a. When one wire W1 moves in the direction of the second wire guide 52 indicated by the arrow D32, the movement of the wire W1 in the axial direction of the annular feed path Ru indicated by the arrow D3 is restricted by contacting the second wire guide 52.

[0055] When the other wire W2 attempts to move in the direction of the second wire guide 52 indicated by the arrow D32, the other wire W2 comes into contact with one wire W1. One wire W1, by contacting the second wire guide 52, is restricted from moving axially along the annular feed path Ru indicated by the arrow D3. As a result, the other wire W2 is suppressed from further moving in the direction of the second wire guide 52 indicated by the arrow D32 via one wire W1.

[0056] Therefore, the other wire W2 is suppressed from moving in the direction of one wire W1, and the positions of the two wires W are suppressed from being swapped between the second wire guide 52 and the third wire guide 53.

[0057] The two wires W passing through the curl guide 50a contact the parallel guide portion 55 on the downstream side of the curl guide 50a, as shown in FIG. 3C. The parallel guide portion 55 is composed of a plane along the axial direction of the annular feed path Ru. Also, the distance Ra1 between the second wire guide 52 and the third wire guide 53 is not less than twice the diameter R of the wire W.

[0058] As a result, the two wires W pass through the curl guide 50a and are fed through the annular feed path Ru without the positions of the two wires W being swapped by the suppression portion 54. Also, the two wires W are arranged in parallel in the axial direction of the annular feed path Ru by the parallel guide portion 55 and pass through the curl guide 50a.

[0059] As described above, one wire W1 is prevented from moving in the direction of the third wire guide 53 indicated by the arrow D31 and from moving in the direction of the other wire W2 by contacting the inclined surface 54b of the guide portion 54a. Further, when one wire W1 contacts the inclined surface 54b of the guide portion 54a, a force acts to move the wire W1 in the direction of the second wire guide 52 indicated by the arrow D32, and the wire W1 can move in the direction of the arrow D32 up to the position where it contacts the second wire guide 52. The other wire W2 is prevented from moving in the direction of the third wire guide 53 indicated by the arrow D31 by contacting the inclined surface 54b of the guide portion 54a. Further, when the other wire W2 contacts one wire W1, the other wire W2 is prevented from moving in the direction of the second wire guide 52 indicated by the arrow D32 via one wire W1. Therefore, the axial movement of one wire W1 and the other wire W2 in the annular feed path Ru indicated by the arrow D3 is suppressed. As a result, the amount of movement of the wire W in the left-right direction within the curl guide 50a is reduced. Therefore, since the positions of the two wires W curled by the curl guide 50a are prevented from being interchanged by the operation of feeding the wire W in the forward direction, the position of the wire W discharged from the curl guide 50a is stabilized, and the amount of deviation in the left-right direction is reduced, so that the required width dimension of the guide 50b can be suppressed.

[0060] As a result, even if the diameter of the annular feed path Ru increases, a plurality of wires W can be fed from the curl guide 50a into the guide 50b. Therefore, it is not necessary to increase the size of the guide 50b, and an increase in the size of the rebar tying machine 1A and an increase in the weight of the rebar tying machine 1A can be suppressed, and a deterioration in operability can be suppressed.

[0061] Incidentally, the parallel guide portion 55 extends in a direction substantially perpendicular to the direction along the axial direction of the annular feed path Ru indicated by the arrow D3 with respect to the plate-like member constituting the first wire guide 51, the plate-like member constituting the second wire guide 52, and the plate-like member constituting the third wire guide 53. The curl guide 50a is provided with the parallel guide portion 55 and the guide member 50g at the discharge portion 50e in the circumferential direction of the annular feed path Ru indicated by the arrow D2. Thereby, when the guide member 50g is press-fitted into the hole portion 52h of the second wire guide 52, the recess 51h of the first wire guide 51, and the hole portion 53h of the third wire guide 53, a force is applied substantially perpendicular to the surface of the plate-like member constituting the second wire guide 52 or the like. Therefore, it is easy to provide the guide member 50g.

[0062] Further, the guide portion 54a may be configured by an inclined surface that inclines outward in the radial direction of the annular feed path Ru indicated by the arrow D1 toward the third wire guide 53 in the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3. Furthermore, the guide portion 54a may be composed of an inclined surface that inclines outward in the radial direction of the annular feed path Ru indicated by the arrow D1 toward the second wire guide 52 from the vicinity of the center in the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3, and an inclined surface that inclines outward in the radial direction of the annular feed path Ru indicated by the arrow D1 toward the third wire guide 53 from the vicinity of the center.

[0063] ·Another configuration example of the curl guide FIG. 4 is a side view with some parts removed showing another example of the curl guide, FIG. 5A is a side view showing another example of the curl guide, and FIG. 5B is a cross-sectional view taken along line D-D of FIG. 5A. FIG. 4 shows a state in which the second wire guide 52 is removed. Next, with reference to each drawing, another example of the curl guide 50c will be described.

[0064] The curl guide 50c includes a first wire guide 51c that restricts the position of the wire W that moves toward the outer peripheral side in the radial direction with respect to the radial direction of the annular feed path Ru indicated by the arrow D1 in FIG. 4 along the circumferential direction of the annular feed path Ru indicated by the arrow D2.

[0065] With respect to the axial direction of the annular feed path Ru indicated by the arrow D3 in FIG. 5B, the first wire guide 51c of the curl guide 50c is sandwiched between the second wire guide 52 and the third wire guide 53. As a result, in the curl guide 50c, the second wire guide 52 and the third wire guide 53 face each other with a gap corresponding to the thickness of the first wire guide 51c. The gap Ra1 between the second wire guide 52 and the third wire guide 53 is equal to or greater than twice the diameter R of the wire W.

[0066] The curl guide 50c includes a restraining portion 56 that restrains one wire W1 out of a plurality of wires W, in this example, one of the two wires W, from moving in the direction of the other wire W2. The restraining portion 56 includes a guide portion 56a having different heights along the radial direction of the annular feed path indicated by the arrow D1 in the width direction of the first wire guide 51c along the axial direction of the annular feed path Ru indicated by the arrow D3.

[0067] The guide portion 56a is provided on the first wire guide 51c. In the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3, at least the side closer to the second wire guide 52, in this example, a range of about half of the side closer to the second wire guide 52, is composed of an inclined surface 56b that inclines outward along the radial direction of the annular feed path Ru indicated by the arrow D1 toward the second wire guide 52. In the circumferential direction of the annular feed path Ru indicated by the arrow D2, the inclined surface 56b is formed over the entire area of the guide portion 56a. Also, in the circumferential direction of the annular feed path Ru indicated by the arrow D2, the guide portion 56a is composed of a concave curved surface or the like that follows the annular feed path Ru.

[0068] FIG. 6 is a side view with some components removed, showing a modification of the curl guide in another example. FIG. 6 shows a state where the second wire guide 52 shown in FIG. 5B and the like is removed. The curl guide 50c2 includes a first wire guide 51c2 that regulates the position of the wire W moving toward the outer peripheral side in the radial direction along the circumferential direction of the annular feed path Ru indicated by arrow D2 with respect to the radial direction of the annular feed path Ru indicated by arrow D1 in FIG. 6. The first wire guide 51c2 includes the suppression portion 56 described above, and the suppression portion 56 includes a guide portion 56a.

[0069] In the circumferential direction of the annular feed path Ru indicated by arrow D2, the guide portion 56a described above is formed up to the vicinity in front of the discharge portion 50e of the curl guide 50c2. Further, in the curl guide 50c2, a parallel guide portion 57 is formed at the discharge portion 50e.

[0070] The parallel guide portion 57 is composed of a surface along the axial direction of the annular feed path Ru in the width direction of the first wire guide 51c along the axial direction of the annular feed path Ru indicated by arrow D3.

[0071] The guide portion 56a gradually decreases in inclination toward the downstream side with respect to the feed direction of the wire W fed in the positive direction indicated by arrow F and is connected to the parallel guide portion 57.

[0072] Regarding the operation and effect of the curl guides 50c and 50c2, among the two wires W fed in the positive direction by the wire feeding unit 3 and passing through the curl guides 50c and 50c2, one wire W1 passing through the side closer to the second wire guide 52 contacts the guide portion 56a as shown in FIG. 5B. When one wire W1 contacts the guide portion 56a during the process of feeding the wire W by the wire feeding unit 3, the movement of the wire W1 in the direction of the third wire guide 53 indicated by arrow D31 is suppressed by the inclined surface 56b of the guide portion 56a.

[0073] Thereby, the movement of one wire W1 in the direction of the other wire W2 is suppressed, and the positions of the two wires W are prevented from being interchanged between the second wire guide 52 and the third wire guide 53.

[0074] Also, one wire W1 is subjected to a force that attempts to move in the direction of the second wire guide 52 indicated by arrow D32 by the inclined surface 56b of the guide portion 56a. When one wire W1 moves in the direction of the second wire guide 52 indicated by arrow D32, it comes into contact with the second wire guide 52, thereby restricting the axial movement of the annular feed path Ru indicated by arrow D3.

[0075] When the other wire W2 attempts to move in the direction of the second wire guide 52 indicated by arrow D32, this other wire W2 comes into contact with one wire W1. One wire W1 is in contact with the second wire guide 52, thereby restricting the axial movement of the annular feed path Ru indicated by arrow D3. As a result, the further movement of the other wire W2 in the direction of the second wire guide 52 indicated by arrow D32 is suppressed via one wire W1.

[0076] Therefore, the movement of the other wire W2 in the direction of one wire W1 is suppressed, and the positions of the two wires W are prevented from being interchanged between the second wire guide 52 and the third wire guide 53.

[0077] Accordingly, the two wires W are guided in a state where the position interchange in the axial direction of the annular feed path Ru is suppressed by the restraining portion 56 by passing through the curl guides 50c, 50c2.

[0078] As described above, one wire W1 is in contact with the slope 56b of the guide portion 56a, thereby being suppressed from moving in the direction of the third wire guide 53 indicated by the arrow D31 and also being suppressed from moving in the direction of the other wire W2. Further, when one wire W1 is in contact with the slope 56b of the guide portion 56a, a force that attempts to move the wire W1 in the direction of the second wire guide 52 indicated by the arrow D32 is applied, and the wire W1 can move in the direction of the arrow D32 up to the position where it contacts the second wire guide 52. The other wire W2 is in contact with one wire W1, thereby being suppressed from moving in the direction of the second wire guide 52 indicated by the arrow D32. Therefore, the axial movement of one wire W1 and the other wire W2 in the annular feed path Ru indicated by the arrow D3 is suppressed. As a result, within the curl guides 50c and 50c2, the amount of movement of the wire W in the left-right direction is reduced. Therefore, since the positions of the two wires W curled by the curl guides 50c and 50c2 are prevented from being interchanged by the operation of feeding the wire W in the forward direction, the position of the wire W sent out from the curl guides 50c and 50c2 is stabilized, and the amount of deviation in the left-right direction is reduced, so that the required width dimension of the guide 50b can be suppressed.

[0079] FIG. 7 is a side view with some components removed showing still another example of the curl guide, FIG. 8A is a side view showing still another example of the curl guide, FIG. 8B is a cross-sectional view taken along line E - E of FIG. 8A, and FIG. 8C is a cross-sectional view taken along line F - F of FIG. 8A. FIG. 7 shows a state in which the second wire guide 52 is removed. Next, with reference to each figure, the curl guide 50d of still another example will be described.

[0080] The curl guide 50d includes a first wire guide 51d that regulates the position of the wire W directed toward the outer peripheral side in the radial direction with respect to the radial direction of the annular feed path Ru indicated by the arrow D1 in FIG. 7 along the circumferential direction of the annular feed path Ru indicated by the arrow D2.

[0081] The curl guide 50d has the first wire guide 51d sandwiched between the second wire guide 52 and the third wire guide 53 with respect to the axial direction of the annular feed path Ru indicated by the arrow D3 in FIG. 8B. As a result, in the curl guide 50d, the second wire guide 52 and the third wire guide 53 face each other with a gap equal to the thickness of the first wire guide 51d. The gap Ra1 between the second wire guide 52 and the third wire guide 53 is not less than twice the diameter R of the wire W.

[0082] The curl guide 50d includes a restraining portion 58 that restrains the axial movement of one of the plurality of wires W, specifically, one wire W1 out of the two wires W in this example, along the annular feed path. The restraining portion 58 includes a guide portion 58a with different heights along the radial direction of the annular feed path indicated by the arrow D1 in the width direction of the first wire guide 51d along the axial direction of the annular feed path Ru indicated by the arrow D3.

[0083] The guide portion 58a is provided on the first wire guide 51d. The guide portion 58a includes a vertical wall 58b facing the second wire guide 52. To form the vertical wall 58b, in the width direction of the first wire guide 51 along the axial direction of the annular feed path Ru indicated by the arrow D3, it is concave in the direction outward along the radial direction of the annular feed path Ru indicated by the arrow D1 on the side closer to the second wire guide 52, and a step for one wire W1 to enter is provided. The width of the guide portion 58a along the axial direction of the annular feed path Ru indicated by the arrow D3 is slightly larger than the diameter R of the wire W, and the depth along the radial direction of the annular feed path Ru indicated by the arrow D1 is a step about half the diameter R of the wire W. As a result, the vertical wall 58b faces the second wire guide 52 with a gap not less than the diameter of the wire W. Further, in the circumferential direction of the annular feed path Ru indicated by the arrow D2, the guide portion 58a is formed of a concave curved surface or the like along the annular feed path Ru. In the circumferential direction of the annular feed path Ru indicated by the arrow D2, the vertical wall 58b of the guide portion 58a is formed up to the vicinity of the discharge portion 50e of the curl guide 50d.

[0084] In the discharge portion 50e of the curl guide 50d, a parallel guide portion 59 is formed.

[0085] The parallel guide portion 59 is composed of a surface along the axial direction of the annular feed path Ru indicated by the arrow D3 in the width direction of the first wire guide 51d along the axial direction of the annular feed path Ru.

[0086] The guide portion 58a is connected to the parallel guide portion 59 such that the height of the vertical wall 58b gradually decreases toward the downstream side with respect to the feeding direction of the wire W fed in the positive direction indicated by the arrow F.

[0087] Regarding the function and effect of the curl guide 50d, among the two wires W fed in the positive direction by the wire feeding section 3 and passing through the curl guide 50d, one wire W1 passing through the side closer to the second wire guide 52 enters the guide portion 58a as shown in FIG. 8B. When one wire W1 enters the guide portion 58a during the process of feeding the wire W, the movement of the wire W1 in the direction of the third wire guide 53 indicated by the arrow D31 is suppressed by the vertical wall 58b of the guide portion 58a. Therefore, the movement of one wire W1 in the direction of the other wire W2 is suppressed, and the positions of the two wires W are prevented from being interchanged between the second wire guide 52 and the third wire guide 53.

[0088] Also, when one wire W1 attempts to move in the direction of the second wire guide 52 indicated by the arrow D32, when it comes into contact with the second wire guide 52, the movement in the direction of the annular feed path Ru indicated by the arrow D3 is restricted.

[0089] When the other wire W2 attempts to move in the direction of the second wire guide 52 indicated by the arrow D32, this other wire W2 comes into contact with one wire W1. One wire W1, by coming into contact with the second wire guide 52, has its movement in the axial direction of the annular feed path Ru indicated by the arrow D3 restricted. As a result, the further movement of the other wire W2 in the direction of the second wire guide 52 indicated by the arrow D32 is suppressed via one wire W1.

[0090] Therefore, the movement of the other wire W2 in the direction of one wire W1 is suppressed, and the positions of the two wires W are suppressed from being interchanged between the second wire guide 52 and the third wire guide 53.

[0091] The two wires W are guided in a state where the suppression unit 58 suppresses the positions of the two wires W from being interchanged in the axial direction of the annular feed path Ru by passing through the curl guide 50d.

[0092] Also, as described above, one wire W1 is suppressed from moving in the direction of the third wire guide 53 indicated by the arrow D31 by contacting the vertical wall 58b of the guide portion 58a, and is suppressed from moving in the direction of the other wire W2. Also, one wire W can move in the direction of the second wire guide 52 indicated by the arrow D32 until it contacts the second wire guide 52. The other wire W2 is suppressed from moving in the direction of the second wire guide 52 indicated by the arrow D32 by contacting one wire W1. Therefore, the movement of one wire W1 and the other wire W2 in the axial direction of the annular feed path Ru indicated by the arrow D3 is suppressed. As a result, the amount of movement of the wire W in the left-right direction within the curl guide 50d is reduced. Therefore, the positions of the two wires W curled by the curl guide 50d by the operation of feeding the wire W in the forward direction are suppressed from being interchanged, and the amount of deviation of the wire sent out from the curl guide 50d in the left-right direction is reduced, and the required width dimension of the guide 50b can be suppressed.

Explanation of Reference Numerals

[0093] 1A... Steel bar tying machine, 10... Main body, 2... Magazine, 20... Reel, 3... Wire feeding section, 30 (30L, 30R)... Feeding gear, 31... Feeding motor, 5... Curl forming section, 50a, 50c, 50c2, 50d... Curl guide, 50b... Inductive guide, 51, 51c, 51d... First wire guide, 52... Second wire guide, 53... Third wire guide, 54, 56, 58... Suppressing section, 54a, 56a, 58a... Guide section, 54b, 56b... Inclined plane, 58b... Vertical wall, 55, 57, 59... Parallel guide section, 6... Cutting section, 7... Tying section, 8... Driving section, 80... Twisting motor, 81... Reducer, W (W1, W2)... Wire

Claims

1. A wire feeding unit for feeding a plurality of wires, a curl forming unit that constitutes an annular feed path for winding a plurality of wires fed by the wire feeding unit around a bundle, a bundling unit for twisting a plurality of wires wound around the bundle, wherein the curl forming unit includes a curl guide for imparting a curl to a plurality of wires fed by the wire feeding unit, and a guiding guide for guiding a plurality of wires imparted with a curl by the curl guide to the bundling unit, the curl guide includes a first wire guide for regulating the position of a wire directed toward the outer peripheral side in the radial direction with respect to the radial direction of the annular feed path, a second wire guide for regulating the position of a wire directed toward one side in the axial direction with respect to the axial direction of the annular feed path, and a third wire guide for regulating the position of a wire directed toward the other side in the axial direction, the curl guide includes a suppressing unit capable of allowing a plurality of wires to be arranged side by side between the second wire guide and the third wire guide along the axial direction of the annular feed path while being in contact with each other, and suppressing movement of one wire among the plurality of wires in the direction of the other wires, a bundling machine.

2. The bundling machine according to claim 1, wherein the suppressing unit includes a guide portion having different heights along the radial direction of the annular feed path in the width direction of the first wire guide along the axial direction of the annular feed path. The bundling machine according to claim 1.

3. The bundling machine according to claim 1, wherein the curl guide suppresses movement of other wires in the direction of the one wire through the wire whose movement is suppressed by the suppressing unit. The bundling machine according to claim 1.

4. The bundling machine according to claim 2, wherein the guide portion includes an inclined surface that inclines in a direction toward the outside along the radial direction of the annular feed path in the width direction of the first wire guide along the axial direction of the annular feed path. The bundling machine according to claim 2.

5. The bundling machine according to claim 4, wherein the guide portion includes inclined surfaces that incline in a direction toward the outside along the radial direction of the annular feed path on the side closer to the second wire guide, the side closer to the third wire guide, or both the side closer to the second wire guide and the side closer to the third wire guide in the width direction of the first wire guide along the axial direction of the annular feed path. The bundling machine according to claim 4.

6. The bundling machine according to claim 2, wherein the guide portion includes a step along the radial direction of the annular feed path in the width direction of the first wire guide along the axial direction of the annular feed path. The bundling machine according to claim 2.

7. The guide portion includes a vertical wall facing the second wire guide. The bundling machine according to claim 6.

8. The restraining portion is formed on the first wire guide along the circumferential direction of the annular feed path. The bundling machine according to claim 2.

9. The restraining portion is provided on the upstream side of the curl guide with respect to the feed direction of the wire fed in the forward direction by the wire feeding portion. The bundling machine according to claim 8.

10. The restraining portion is provided in at least 1 / 4 of the range of the annular feed path in the circumferential direction of the annular feed path. The bundling machine according to claim 9.

11. The curl guide includes a parallel guide portion formed by a surface along the axial direction of the annular feed path on the downstream side of the restraining portion with respect to the feed direction of the wire fed in the forward direction by the wire feeding portion. The bundling machine according to claim 9.

12. The height of the restraining portion along the radial direction of the annular feed path gradually changes toward the parallel guide portion. The bundling machine according to claim 11.

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