Binding machine

Abstract

To provide a reinforcement-bar binding machine adapted to positively guide a wire contacting at its tip a bottom surface of a curl guide.SOLUTION: A reinforcement-bar binding machine 1A comprises a curl forming unit 5 that makes up an annular feed path Ru for winding a wire W fed by a wire feeding unit 3 around a reinforcement bar, and a binding unit 7 that twists the wire W wound around the reinforcement bar. The curl forming unit 5 has an arm part 50 that gives the wire W with a tendency toward winding, and a curl guide part 51 that is for guiding the wire W given a tendency toward winding by the arm part 50 to the binding unit 7. The curl guide part 51 has a bottom surface 52a radially outside the annular feed path Ru, and the bottom surface 52a has a guide portion 52c for guiding a tip of the wire W toward a base end 51b side of the curl guide part 51, on a tip portion 51a side of the curl guide part 51 where the tip of the wire W fed by the wire feeding unit 3 contacts.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

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

[0002] Steel bars are used in concrete structures to increase their strength, and are tied together with wire to prevent the bars from shifting from their designated positions when the concrete is poured.

[0003] BACKGROUND ART Conventionally, a binding machine known as a reinforcing bar binding machine has been proposed, which binds two or more reinforcing bars with wire by winding wire around the reinforcing bars and twisting the wire wound around the reinforcing bars.

[0004] The bundling machine uses a motor to drive the wire, guides the curled wire to a bundling section that twists the wire using a guide such as a curl guide, and twists the wire wound around the reinforcing bars at the bundling section, thereby bundling the reinforcing bars with the wire. In order to be able to guide the curled wire to the bundling section, a bundling machine has been proposed that is equipped with a guidance promoting section that contacts the wire from the radial outside of the loop formed by the curled wire and applies a force to the wire to change the wire feed path (see, for example, Patent Document 1).

[0005] Furthermore, as the diameter of the reinforcing bars to be bound with the wire increases, the diameter of the feed path for the wire that is wound around the reinforcing bars in a circular shape must also increase. Therefore, a reinforcing bar binding machine has been proposed that can reliably guide the wire to the binding section even when the diameter of the feed path for the circular wire increases (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2022-164438 [Patent Document 2] Patent No. 7302302 Publication Summary of the Invention [Problem to be solved by the invention]

[0007] In conventional bundling machines, where the diameter of the rebars to be bundled with the wire is small and the diameter of the wire feed path for the wire to be wound into a ring is small, the wire guided by the curl guide passes through a path away from the bottom surface of the curl guide. In contrast, when the diameter of the wire feed path for the wire to be wound into a ring becomes larger, the tip of the wire guided by the curl guide comes into contact with the bottom surface of the curl guide. This increases the frictional resistance as the wire slides along the bottom surface, potentially making it impossible to feed the wire to the bundling section.

[0008] The present invention has been made to solve such problems, and its object is to provide a binding machine that can reliably guide wires whose tips are in contact with the bottom surface of a curl guide. [Means for solving the problem]

[0009] In order to solve the above-mentioned problems, the present invention provides a binding machine comprising a wire feeding section that feeds a wire, a curl forming section that forms a circular feeding path for winding the wire fed by the wire feeding section around a material to be bound, and a binding section that twists the wire wound around the material to be bound, wherein the curl forming section comprises an arm section that imparts a curl to the wire fed by the wire feeding section, and a curl guide section that guides the wire that has been curled by the arm section to the binding section, and the curl guide section has a bottom section radially outside the circular feeding path, the bottom section forms at least a part of the tip side of the curl guide section, and is equipped with a guide section that guides the tip of the wire toward the base end side of the curl guide section.

[0010] The present invention also provides a binding machine comprising: a wire feeding unit that feeds a wire; a curl forming unit that forms a circular feed path along which the wire fed by the wire feeding unit is wound around a material to be bound; and a binding unit that twists the wire wound around the material to be bound; the curl forming unit comprises an arm unit that imparts a curl to the wire fed by the wire feeding unit; and a curl guide unit that guides the wire that has been curled by the arm unit to the binding unit; the curl guide unit has a bottom surface on the radial outside of the circular feed path; the bottom surface has a guide portion that forms at least a part of the tip side of the curl guide unit; the guide portion has an inclined surface that is inclined relative to the bottom surface in a direction where a first end on the tip side of the curl guide unit approaches the arm unit more than a second end on the base end side of the curl guide unit; and the inclined surface is configured such that the dimension of the first end relative to the second end is longer in a direction parallel to an imaginary extension line of the bottom surface than in a direction perpendicular to the imaginary extension line of the bottom surface. [Effects of the Invention]

[0011] In the present invention, when the wire is fed by the wire feeding unit with the tip of the wire in contact with the guiding unit, the tip of the wire can move along the surface of the guiding unit toward the base end of the curl guide unit, thereby guiding the wire to the bundling unit and performing the bundling operation. [Brief explanation of the drawings]

[0012] [Figure 1A] 1 is a side view showing an internal configuration of an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 1B] 1 is a side view of a main part showing an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 2] 1 is an external side view showing an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 3A] 1 is an external perspective view showing an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 3B] 1 is an external perspective view showing an example of a reinforcing bar binding machine according to an embodiment of the present invention. [Figure 4A] FIG. 2 is a side view of a main part showing an example of the operation of the reinforcing bar binding machine of the present embodiment. [Figure 4B]FIG. 2 is a side view of a main part showing an example of the operation of the reinforcing bar binding machine of the present embodiment. [Figure 4C] FIG. 2 is a side view of a main part showing an example of the operation of the reinforcing bar binding machine of the present embodiment. [Figure 4D] FIG. 2 is a side view of a main part showing an example of the operation of the reinforcing bar binding machine of the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0014] <Configuration example of the reinforcing bar binding machine according to this embodiment> Fig. 1A is a diagram showing an internal configuration from the side of an example of a reinforcing bar binding machine according to this embodiment, Fig. 1B is a side view of a main part of the example of the reinforcing bar binding machine according to this embodiment, Fig. 2 is a side view of the exterior of the example of the reinforcing bar binding machine according to this embodiment, and Figs. 3A and 3B are perspective views of the exterior of the example of the reinforcing bar binding machine according to this embodiment.

[0015] The reinforcing bar binding machine 1A is designed to be held by an operator and includes a main body 10 and a handle 11. The reinforcing bar binding machine 1A feeds the wire W in the forward direction indicated by the arrow F to wind it around the reinforcing bar S to be bound, and then feeds the wire W wound around the reinforcing bar S in the reverse direction indicated by the arrow R to wind it around the reinforcing bar S, after which the wire W is twisted and the reinforcing bar S is bound with the wire W. The reinforcing bar binding machine 1A binds the reinforcing bars S with multiple wires W, two wires W in this example.

[0016] To achieve the above-mentioned functions, the reinforcing bar binding machine 1A is equipped with a magazine 2 that stores the wire W, a wire feeding unit 3 that feeds the wire W, and a wire guide unit 4 that guides the wire W fed to the wire feeding unit 3. The reinforcing bar binding machine 1A also has a curl forming unit 5 that forms a circular feeding path for winding the wire W fed by the wire feeding unit 3 around the reinforcing bar S, and a cutting unit 6 that cuts the wire W wound around the reinforcing bar S. The reinforcing bar binding machine 1A is further equipped with a binding unit 7 that twists the wire W wound around the reinforcing bar S, and a drive unit 8 that drives the binding unit 7. The reinforcing bar binding machine 1A is also equipped with tip guide units 9 (9L, 9R) against which the reinforcing bar S is butted and that support the curl forming unit 5.

[0017] The magazine 2 is an example of a storage section, and rotatably and detachably stores a reel 20 around which a long wire W is wound so that it can be unwound. The wire W is a wire made of a metal wire that can be plastically deformed, a metal wire coated with resin, or a twisted wire. In a configuration in which two wires W are used to bind reinforcing bars S, the two wires W are wound around the reel 20, and the two wires W can be pulled out from the reel 20 at the same time.

[0018] The wire feeding unit 3 includes a pair of feed gears 30 that clamp and feed the wire W. The rotation of a feed motor (not shown) is transmitted to the feed gear 30, causing the feed gear 30 to rotate. The wire feeding unit 3 also switches the rotation direction of the feed motor (not shown) between forward and reverse, thereby switching the rotation direction of the feed gear 30 and the forward and reverse feed direction of the wire W. In a configuration in which reinforcing bars S are bound together with two wires W, the wire feeding unit 3 feeds the two wires W aligned in the radial direction of the wires W.

[0019] The wire guide units 4 are arranged upstream and downstream of the feed gears 30 with respect to the feeding direction of the wire W fed in the forward direction. In a configuration in which two wires W are used to bind reinforcing bars S, the wire guide units 4 guide the two incoming wires W between the pair of feed gears 30 by aligning them in the direction in which the pair of feed gears 30 are aligned.

[0020] The curl forming unit 5 includes an arm unit 50 that curls the wire W fed by the wire feeding unit 3, and a curl guide unit 51 that guides the wire W curled by the arm unit 50 to the bundling unit 7. The curl forming unit 5 curls the wire W fed by the wire feeding unit 3 and passing through the arm unit 50 with the arm unit 50, and guides the wire W curled by the arm unit 50 with the curl guide unit 51 to the bundling unit 7. As a result, the curl forming unit 5 forms a feed path for the wire W as shown by the two-dot chain line, from the arm unit 50 through the curl guide unit 51 to the bundling unit 7. The feed path for the wire W from the arm unit 50 through the curl guide unit 51 to the bundling unit 7 is referred to as the circular feed path Ru.

[0021] The arm portion 50 has a groove portion 50a formed along the circumferential direction of the circular feed path Ru, the groove portion 50a having a width that allows the wire W to pass through. In a configuration in which the reinforcing bars S are bound together with two wires W, the arm portion 50 aligns the two wires W that have entered in a direction that is aligned along the axial direction of the circular feed path Ru.

[0022] The curl guide section 51 includes an enlarged section 52 into which the wire W curled by the arm section 50 enters, and a return guide section 53 that guides the wire W that has entered the enlarged section 52 to the bundling section 7.

[0023] The widened portion 52 includes a bottom surface portion 52a provided radially outside the annular feed path Ru, and side surface portions 52b (52bL, 52bR) provided on both sides of the annular feed path Ru in the axial direction.

[0024] The bottom surface portion 52a includes a guide portion 52c that constitutes at least a part of the tip portion 51a side of the curl guide portion 51.

[0025] The guide portion 52c includes an inclined surface 52d that is provided on the radially outer side of the annular feed path Ru and on a path along which the tip of the wire W entering the widening portion 52 passes. In this example, the inclined surface 52d of the guide portion 52c is configured as a flat surface. The inclined surface 52d of the guide portion 52c extends from the tip end 51a of the curl guide portion 51 toward the base end 51b of the curl guide portion 51, which is the end on the bundling portion 7 side, by a length that is expected to come into contact with the tip of the wire W entering the widening portion 52, and connects to the bottom surface portion 52a.

[0026] The guide portion 52c has an inclined surface 52d inclined relative to the bottom surface 52a in a direction such that the first end 52c1, which is the end on the tip portion 51a side of the curl guide portion 51, is closer to the arm portion 50 than the second end 52c2, which is the end on the bottom surface 52a side.

[0027] The dimension of the first end 52c1 of the inclined surface 52d relative to the second end 52c2 is longer in a direction parallel to an imaginary extension line of the bottom surface 52a than in a direction perpendicular to the imaginary extension line of the bottom surface 52a. That is, the guide portion 52c is configured such that the length L of the inclined surface 52d from the first end 52c1 to the second end 52c2 in a direction parallel to the surface of the bottom surface 52a is longer than the height H of the first end 52c1 of the inclined surface 52d relative to the bottom surface 52a in a direction intersecting the surface of the bottom surface 52a.

[0028] As a result, the inclined surface 52d of the guide portion 52c extends along the circumferential direction of the annular feed path Ru on the side of the bottom surface 52a closer to the tip end 51a of the curl guide portion 51. The cross-sectional shape of the inclined surface 52d of the guide portion 52c in a direction parallel to the annular feed path Ru, i.e., the cross-sectional shape of the inclined surface 52d when viewing the curl guide portion 51 from the side along the axial direction of the annular feed path Ru, extends linearly in this example in a predetermined direction along the circumferential direction of the annular feed path Ru.

[0029] Furthermore, the bottom surface portion 52a extends along the circumferential direction of the annular feed path Ru, closer to the base end portion 51b of the curl guide portion 51 than the guide portion 52c. When the curl guide portion 51 is viewed from the side along the axial direction of the annular feed path Ru, the cross-sectional shape of the bottom surface portion 52a extends linearly in a predetermined direction along the circumferential direction of the annular feed path Ru, in this example, along the tangent direction of the apex of the portion of the annular feed path Ru that faces the bottom surface portion 52a.

[0030] The side portions 52bL, 52bR include a first side portion 52b1 (52b1L, 52b1R) consisting of parallel surfaces spaced apart from each other, and a second side portion 52b2 (52b2L, 52b2R) consisting of surfaces whose spacing narrows from the tip end 51a side to the base end 51b side of the curl guide portion 51.

[0031] The first side surface portions 52b1L and 52b1R extend from the tip end portion 51a of the curl guide portion 51 toward the base end portion 51b of the curl guide portion 51 by a predetermined length.

[0032] The first side surface portions 52b1L, 52b1R and the second side surface portions 52b2L, 52b2R protrude radially inward of the annular feed path Ru relative to the inclined surface 52d and the bottom surface portion 52a of the guide portion 52c.

[0033] The entire first side surface portions 52b1L, 52b1R and parts of the second side surface portions 52b2L, 52b2R connected to the first side surface portions 52b1L, 52b1R are provided on both sides of the inclined surface 52d. The remaining parts of the second side surface portions 52b2L, 52b2R of the side surface portions 52bL, 52bR are provided on both sides of the bottom surface portion 52a.

[0034] As a result, in guide portion 52c, the width of inclined surface 52d is the same in the region where first side surface portions 52b1L, 52b1R are provided on both sides. In addition, in guide portion 52c, the width of inclined surface 52d gradually narrows from tip end 51a toward base end 51b of curl guide portion 51 in the region where second side surface portions 52b2L, 52b2R are provided on both sides. Bottom surface portion 52a gradually narrows in width from tip end 51a toward base end 51b of curl guide portion 51.

[0035] The side surface portions 52bL, 52bR are in contact with the inclined surface 52d of the guide portion 52c so that the wire W does not get in between the first side surface portion 52b1L and the second side surface portion 52b2L and the inclined surface 52d of the guide portion 52c. A gap narrower than the diameter of the wire W may be formed between the first side surface portion 52b1L and the second side surface portion 52b2L and the inclined surface 52d of the guide portion 52c.

[0036] Furthermore, the side surface portions 52bL, 52bR are in contact with the inclined surface 52d of the guide portion 52c so that the wire W does not get in between the first side surface portion 52b1R and the second side surface portion 52b2R and the inclined surface 52d of the guide portion 52c. Note that a gap narrower than the diameter of the wire W may be formed between the first side surface portion 52b1R and the second side surface portion 52b2R and the inclined surface 52d of the guide portion 52c.

[0037] The side surface portions 52bL, 52bR are in contact with the bottom surface 52a so that the wire W does not get between the second side surface portion 52b2L and the bottom surface 52a. A gap narrower than the diameter of the wire W may be formed between the second side surface portion 52b2L and the bottom surface 52a.

[0038] The side surface portions 52bL, 52bR are in contact with the bottom surface 52a to prevent the wire W from getting between the second side surface portion 52b2R and the bottom surface 52a. A gap narrower than the diameter of the wire W may be formed between the second side surface portion 52b2R and the bottom surface 52a.

[0039] The return guide portion 53 includes an inclined portion 53a provided on the radially outer side of the annular feed path Ru, and side portions 53b (53bL, 53bR) provided on both sides of the annular feed path Ru in the axial direction.

[0040] The inclined portion 53a is configured with a surface that is inclined relative to the bottom surface portion 52a in a direction toward the bundling portion 7 along the circumferential direction of the annular feed path Ru. The inclined portion 53a extends along the circumferential direction of the annular feed path Ru, closer to the base end portion 51b of the curl guide portion 51 than the bottom surface portion 52a. When the curl guide portion 51 is viewed from the side along the axial direction of the annular feed path Ru, the inclined portion 53a extends linearly in a predetermined direction along the circumferential direction of the annular feed path Ru, in this example, along the tangential direction of the annular feed path Ru.

[0041] The side surface portions 53bL, 53bR are configured as parallel surfaces spaced apart from each other along the direction in which the inclined portion 53a extends. The side surface portions 53bL, 53bR protrude radially inward from the inclined portion 53a along the circular feed path Ru. In a configuration in which the reinforcing bars S are bound together with two wires W, the return guide portion 53 has the side surface portions 53bL, 53bR facing each other at a distance of about twice the diameter of the wires W, and aligns the two entering wires W in a direction aligned along the axial direction of the circular feed path Ru.

[0042] The curl guide portion 51 is configured such that the bottom surface portion 52a, first side surface portions 52b1L, 52b1R, and second side surface portions 52b2L, 52b2R of the widening portion 52, and the side surface portions 53bL, 53bR of the return guide portion 53 are integrally formed by pressing sheet metal such as iron. The curl guide portion 51 also includes a guide portion 52c formed into a predetermined shape from a plate material such as iron and fixed to the bottom surface portion 52a by welding or the like. Furthermore, the curl guide portion 51 includes a plate material such as iron on which an inclined portion 53a is formed and fixed between the side surface portions 53bL, 53bR by fastening members. The curl guide portion 51 may also include a guide portion 52c integrally formed with the bottom surface portion 52a by pressing or the like.

[0043] 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 cutting unit 6 cuts the wire W by the rotational operation of the movable blade unit 61 with the fixed blade unit 60 as a fulcrum axis.

[0044] The bundling unit 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 driving unit 8 includes a torsion motor 80 and a reducer 81 that reduces speed and amplifies torque.

[0045] In the rebar binding machine 1A, a handle portion 11 extends downward from a main body portion 10. Furthermore, a battery 15 is detachably attached to the lower portion of the handle portion 11. In addition, in the rebar binding machine 1A, a magazine 2 is provided in front of the handle portion 11.

[0046] The rebar tying machine 1A has a trigger 12 provided on the front side of a handle portion 11, and a switch 13 provided inside the handle portion 11. In the rebar tying machine 1A, the control unit 100 controls the torsion motor 80 and a feed motor (not shown) according to the state of the switch 13 pressed by operating the trigger 12.

[0047] The tip guide portion 9L is provided on one side at the front end of the main body portion 10. The tip guide portion 9L includes an abutment portion 9La against which the reinforcing bar S abuts, an arm support portion 90L supported by the arm portion 50, a curl guide support portion 91L supported by the curl guide portion 51, and a main body support portion 92L supported by the main body portion 10.

[0048] The tip guide portion 9L has an arm support portion 90L fixed to the arm portion 50 with a screw 90s. Also, the tip guide portion 9L has a curl guide support portion 91L fixed to the curl guide portion 51 with a screw 91s. Furthermore, the tip guide portion 9L has a main body support portion 92L fixed to the main body portion 10 with a screw 92s.

[0049] The tip guide portion 9R is provided on the other side of the front end portion of the main body portion 10. The tip guide portion 9R includes an abutment portion 9Ra against which the reinforcing bar S abuts, an arm support portion 90R supported by the arm portion 50, a curl guide support portion 91R supported by the curl guide portion 51, and a main body support portion 92R supported by the main body portion 10.

[0050] The tip guide portion 9R has an arm support portion 90R fixed to the arm portion 50 with a screw 90s. Also, the tip guide portion 9R has a curl guide support portion 91R fixed to the curl guide portion 51 with a screw 91s. Furthermore, the tip guide portion 9R has a main body support portion 92R fixed to the main body portion 10 with a screw 92s.

[0051] <Examples of the effects of the reinforcing bar binding machine according to this embodiment> 4A to 4D are side views of the main part showing an example of the operation of the reinforcing bar binding machine of this embodiment, and next, with reference to each figure, the operation of binding reinforcing bars S with wire W using the reinforcing bar binding machine 1A of this embodiment will be described. Note that reinforcing bars as objects to be bound are not shown in Figs. 4A to 4D.

[0052] When the reinforcing bar S is placed between the arm portion 50 and the curl guide portion 51 of the curl forming portion 5 and the trigger 12 is operated, the feed motor (not shown) is driven in the forward rotation direction, and the wire W clamped between a pair of feed gears 30 is fed in the forward direction indicated by the arrow F.

[0053] In the case of a configuration in which reinforcing bars S are bound with two wires W, the wire feeding unit 3 and the wire guide unit 4 feed the two wires W in a parallel state along the axial direction of the circular feeding path Ru.

[0054] The wire W fed in the forward direction passes through the wire locking body 70 of the bundling unit 7 and is fed to the arm unit 50 of the curl forming unit 5. By passing through the arm unit 50, the wire W is given a curling tendency to be wound around the reinforcing bar S along the circular feeding path Ru.

[0055] The wire W having been curled by the arm portion 50 is further fed in the forward direction by the wire feed portion 3, whereby it is guided to the curl guide portion 51 and enters the curl guide portion 51 from the widened portion 52. The widened portion 52 is provided on the tip portion 51a side of the curl guide portion 51, so that the wire W having been curled by the arm portion 50 enters between the first side portion 52b1L, 52b1R, and the tip of the wire W faces the bottom surface portion 52a.

[0056] In a configuration in which the guide portion 52c is not provided on the bottom surface portion 52a, the tip of the wire W inserted between the first side surface portions 52b1L, 52b1R comes into contact with the bottom surface portion 52a. When the wire W is further fed in the forward direction by the wire feed unit 3 while the tip of the wire W is in contact with the bottom surface portion 52a of the curl guide portion 51, a force is applied to the wire W to move the tip of the wire W from the tip end portion 51a side to the base end portion 51b side of the curl guide portion 51.

[0057] However, in a configuration in which the guide portion 52c is not provided on the bottom surface portion 52a, the tip of the wire W fed in the forward direction by the wire feed unit 3 may not be able to move along the surface of the bottom surface portion 52a from the tip end portion 51a side to the base end portion 51b side of the curl guide portion 51. If the tip of the wire W cannot move along the surface of the bottom surface portion 52a, the wire W cannot be guided to the binding portion 7.

[0058] Whether or not the tip of the wire W can move along the surface of the bottom surface 52a when the tip of the wire W is in contact with the bottom surface 52a of the curl guide portion 51 depends on the angle of incidence of the wire W with respect to the bottom surface 52a just before the tip of the wire W entering the widening portion 52 comes into contact with the bottom surface 52a.

[0059] Therefore, the reinforcing bar binding machine 1A is provided with a guide portion 52c having an inclined surface 52d on the bottom surface 52a of the curl guide portion 51 on the side of the tip end 51a.

[0060] 4A, in the guide portion 52c, the inclined surface 52d is inclined with respect to the bottom surface portion 52a so that the incident angle θ1 of the wire W with respect to the inclined surface 52d immediately before the tip of the wire W entering the widening portion 52 contacts the inclined surface 52d is 50° or less. Note that the incident angle refers to the angle when the wire W contacts the inclined surface 52d or the angle immediately before that, and does not refer to the angle when the wire W moves after contacting the inclined surface 52d.

[0061] The wire W, which is fed in the forward direction by the wire feed unit 3, has a curl formed by the arm unit 50, and enters the widening unit 52, has a shape in which a predetermined length of the tip side extends linearly. The incident angle of the wire W with respect to the inclined surface 52d of the guiding unit 52c refers to the angle between the inclined surface 52d and the direction in which the tip side of the wire W extends linearly, when the curl guide unit 51 is viewed from the side along the axial direction of the circular feed path Ru.

[0062] In addition, when the wire W extends in a curved manner within a predetermined length from the tip, the tangent to the tip or vertex near the tip of the wire W is considered to be the direction in which the tip side of the wire W extends, and the angle between the direction in which the tangent to the tip or vertex near the tip of the wire W extends and the inclined surface 52d at the wire W just before it comes into contact with the inclined surface 52d can be considered to be the angle of incidence of the wire W with the inclined surface 52d.

[0063] Furthermore, the operation of cutting the wire W with the cutting unit 6 may cause a portion of the tip of the wire W to be deformed in such a manner that it is bent at an obtuse angle. In this case, the angle formed between the extending direction of the deformed portion of the tip of the wire W and the inclined surface 52d may be set as the incident angle of the wire W with respect to the inclined surface 52d.

[0064] When the wire W is further fed in the forward direction by the wire feed unit 3 with the tip of the wire W in contact with the inclined surface 52d of the guide unit 52c, if the incident angle θ1 of the wire W with respect to the inclined surface 52d is 50° or less, the tip of the wire W can move along the inclined surface 52d of the guide unit 52c toward the base end 51b of the curl guide unit 51. As a result, the tip of the wire W fed in the forward direction by the wire feed unit 3 moves to a position in contact with the bottom surface portion 52a, as shown in FIG. 4B .

[0065] When the wire W entering the curl guide portion 51 from the widened portion 52 is closer to the first side surface portion 52b1L, the tip of the wire W moves along the inclined surface 52d of the guiding portion 52c toward the base end portion 51b of the curl guide portion 51, and the wire W comes into contact with the first side surface portion 52b1L, thereby being guided toward between the side surfaces 53bL and 53bR of the return guide portion 53. When the wire W entering the curl guide portion 51 from the widened portion 52 is closer to the first side surface portion 52b1R, the tip of the wire W moves along the inclined surface 52d of the guiding portion 52c toward the base end portion 51b of the curl guide portion 51, and the wire W comes into contact with the first side surface portion 52b1R, thereby being guided toward between the side surfaces 53bL and 53bR of the return guide portion 53.

[0066] The rebar binding machine 1A is configured so that the angle of incidence θ2 of the wire W with respect to the bottom surface 52a is also 50° or less. Therefore, when the wire W is further fed in the forward direction by the wire feeding unit 3 with the tip of the wire W in contact with the bottom surface 52a, the tip of the wire W can move along the surface of the bottom surface 52a toward the base end 51b of the curl guide unit 51. As a result, the tip of the wire W fed in the forward direction by the wire feeding unit 3 moves to a position where it contacts the inclined portion 53a, as shown in FIG. 4C . Furthermore, when the wire W is fed to a position where its tip contacts the inclined portion 53a, a portion of the circumferential direction of the wire W contacts the bottom surface 52a and the inclined surface 52d of the guide unit 52c.

[0067] The rebar binding machine 1A is configured so that the angle of incidence θ3 of the wire W with respect to the inclined portion 53a is also 50° or less. Therefore, when the wire W is further fed in the forward direction by the wire feeding unit 3 with the tip of the wire W in contact with the inclined portion 53a, the tip of the wire W can move along the surface of the inclined portion 53a toward the base end 51b of the curl guide unit 51. As a result, the tip of the wire W fed in the forward direction by the wire feeding unit 3 is guided to the binding unit 7, as shown in FIG. 4D . Furthermore, when the wire W is fed to a position where the tip of the wire W is guided to the binding unit 7, a portion of the circumferential direction of the wire W comes into contact with the bottom surface portion 52a.

[0068] As the wire W is further fed in the forward direction by the wire feed section 3, the wire W passes through the wire locking body 70 and is fed to a position where the tip of the wire W abuts against the feed regulating section 18, and then the drive of the feed motor (not shown) is stopped.

[0069] After the forward feed of the wire W is stopped, the torsion motor 80 is driven in the forward rotation direction. The rotation of the sleeve 71 is restricted in the operating range where the wire locking body 70 locks the wire W. This converts the rotation of the torsion motor 80 into linear movement, and the sleeve 71 moves forward in the direction of arrow A1. When the sleeve 71 moves forward, the wire W is locked by a predetermined operation of the wire locking body 70.

[0070] After the sleeve 71 has been advanced to a position where the wire W is held by the wire holding member 70, the rotation of the torsion motor 80 is temporarily stopped, and the feed motor is driven in the reverse direction.

[0071] As a result, the pair of feed gears 30 rotate in the reverse direction, and the wire W held between the pair of feed gears 30 is fed in the reverse direction indicated by the arrow R. By feeding the wire W in the reverse direction, the wire W is wound around the reinforcing bar S.

[0072] After winding the wire W around the rebar S and stopping the reverse rotation of the feed motor, the torsion motor 80 is driven in the forward rotation direction, causing the sleeve 71 to move further forward as indicated by the arrow A1. The forward movement of the sleeve 71 is transmitted to the cutting unit 6 by the transmission mechanism 62, causing the movable blade unit 61 to rotate, and the wire W is cut at a predetermined position by the operation of the fixed blade unit 60 and the movable blade unit 61.

[0073] By driving the torsion motor 80 in the forward direction, the sleeve 71 moves forward as indicated by the arrow A1, cutting the two wires W, and almost simultaneously, the wire W is pushed forward by the wire retaining body 70, and the tip and end of the wire W are bent toward the reinforcing bar S.

[0074] After the tip and end of the wire W are bent toward the rebar S, the torsion motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to move further forward. When the sleeve 71 has moved to a predetermined position, the restriction on the rotation of the sleeve 71 is released.

[0075] As a result, the torsion motor 80 is further driven in the forward rotation direction, causing the sleeve 71 to rotate and starting the operation of twisting the wire W held by the wire holding body 70. When it is detected that the load on the torsion motor 80 has reached a maximum due to the twisting of the wire W, the forward rotation of the torsion motor 80 is stopped. Next, when the torsion motor 80 is driven in the reverse rotation direction, the sleeve 71 moves backward in the direction of arrow A2 while its rotation is restricted.

[0076] When the sleeve 71 moves rearward, the wire W is released from the wire locking body 70, and the wire W binding the reinforcing bars S comes out of the wire locking body 70.

[0077] In a configuration of the curl forming unit 5 in which the radial length of the annular feed path Ru is approximately 60 mm, the wire W is curled by the arm portion 50 and guided to the curl guide portion 51, and passes through a path away from the bottom portion 52a in the curl guide portion 51.

[0078] In contrast, in a configuration of the curl forming section 5 in which the radial length of the annular feed path Ru is approximately 100 mm or more, the wire W is curled by the arm section 50, and the wire W guided by the curl guide section 51 passes through a path in which the tip thereof contacts the bottom surface section 52a.

[0079] Therefore, the rebar binding machine 1A is provided with a guide portion 52c on the bottom surface portion 52a on the tip portion 51a side of the curl guide portion 51. As a result, the wire W that has been curled by the arm portion 50 and is guided by the curl guide portion 51 has its tip contacting the inclined surface 52d of the guide portion 52c.

[0080] Then, when the wire W is further fed in the forward direction by the wire feed unit 3 with the tip of the wire W in contact with the inclined surface 52d, the tip of the wire W can move along the inclined surface 52d of the guide unit 52c toward the base end 51b of the curl guide unit 51. As a result, the tip of the wire W fed in the forward direction by the wire feed unit 3 can be moved to a position in contact with the bottom surface 52a, and by further feeding the wire W in the forward direction, the wire W can be guided to the bundling unit 7, where the bundling operation can be performed.

[0081] In addition, it is preferable that the angle of the inclined surface 52d of the guide portion 52c relative to the bottom surface portion 52a is 50° or less. Furthermore, the cross-sectional shape of the bottom surface portion 52a when the curl guide portion 51 is viewed from the side along the axial direction of the annular feed path Ru may be a multi-step shape having at least one step, or may be an arc shape. When the cross-sectional shape of the bottom surface portion 52a is an arc shape, the angle of the inclined surface 52d relative to the bottom surface portion 52a may be based on a tangent to the vertex of the arc shape. [Explanation of symbols]

[0082] 1A Rebar tying machine, 10 Main body, 2 Magazine, 20 Reel, 3 Wire feed section, 30 Feed gear, 5 Curl forming section, 50 Arm, 51 Curl guide section, 51a Tip section, 51b Base section, 52 Widening section, 52a Bottom section, 52b (52bL, 52bR) Side section, 52b1 (52b1L, 52b1R) First side section, 52b 2 (52b2L, 52b2R)... second side portion, 52c... guide portion, 52c1... first end portion, 52c2... second end portion, 52d... inclined surface, 53... return guide portion, 53a... inclined portion, 53b (53bL, 53bR)... side portion, 6... cutting portion, 7... binding portion, 8... drive portion, 80... torsion motor, 81... reducer, 9 (9L, 9R)... tip guide portion, W... wire

Claims

1. a wire feeding unit that feeds the wire; a curl forming section that forms a circular feeding path for winding the wire fed by the wire feeding section around a material to be bundled; The wire binding device has a binding section that twists the wire wound around the object to be bound, The curl forming unit includes: an arm unit that curls the wire fed by the wire feeding unit; a curl guide portion that guides the wire curled by the arm portion to the bundling portion, the curl guide portion has a bottom surface portion on the radially outer side of the annular feed path, The bottom surface portion includes a guide portion that constitutes at least a part of the tip end side of the curl guide portion and guides the tip end of the wire toward the base end side of the curl guide portion. Binding machine.

2. a wire feeding unit that feeds the wire; a curl forming section that forms a circular feeding path for winding the wire fed by the wire feeding section around a material to be bundled; The wire binding device has a binding section that twists the wire wound around the object to be bound, The curl forming unit includes: an arm unit that curls the wire fed by the wire feeding unit; a curl guide portion that guides the wire curled by the arm portion to the bundling portion, the curl guide portion has a bottom surface portion on the radially outer side of the annular feed path, the bottom surface portion includes a guide portion that constitutes at least a portion of the tip end side of the curl guide portion, the guide portion includes an inclined surface that is inclined with respect to the bottom surface portion in a direction in which a first end portion on the tip end side of the curl guide portion approaches the arm portion more than a second end portion on the base end side of the curl guide portion, The inclined surface is configured such that the dimension of the first end relative to the second end is longer in a direction parallel to an imaginary extension line of the bottom surface than in a direction perpendicular to the imaginary extension line of the bottom surface. Binding machine.

3. The guide portion has an inclined surface that is inclined with respect to the bottom surface portion on a path along which the tip of the wire passes. The binding machine according to claim 1 .

4. The inclined surface has a linear cross section in a direction parallel to the annular feed path. The binding machine according to claim 2 or 3.

5. The bundling section includes a wire locking body for locking the wire, The inclined surface is inclined toward the wire locking body. The binding machine according to claim 2 or 3.

6. The inclined surface is inclined with respect to the bottom surface portion so that the angle of incidence of the wire with respect to the inclined surface immediately before the tip of the wire comes into contact with the inclined surface is 50° or less. The binding machine according to claim 2 or 3.

7. The inclined surface has an angle of 50° or less with respect to the bottom surface portion. The binding machine according to claim 2 or 3.

8. The curl guide portion has side surfaces provided on both sides of the bottom surface portion and the inclined surface in the axial direction of the annular feed path. The binding machine according to claim 2 or 3.

9. The gap between the inclined surface and the side surface is equal to or less than the diameter of the wire. The binding machine according to claim 8.

10. the curl guide portion includes a widened portion at the tip end portion, the width of the bottom surface portion along the axial direction of the annular feed path narrowing toward the base end portion, The guide portion is provided on at least a part of the widened portion on the tip end side of the curl guide portion. The binding machine according to claim 1 or 2.

11. The radial length of the circular feed path formed by the curl forming section is 100 mm or more. The binding machine according to claim 1 or 2.

Images