Reinforcement binding machine
Patent Information
- Application Number
- JP2023021117
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-02-14
- Publication Date
- 2025-12-22
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
[Technical field]
[0001] The present specification relates to a rebar tying machine. [Background technology]
[0002] Patent Document 1 discloses a rebar tying machine. The rebar tying machine ties rebars using a wire. The rebar tying machine includes a rotatable screw shaft, a sleeve into which the screw shaft is inserted and which is movable and rotatable in the front-rear direction, a fin member attached to the sleeve and permits and prohibits rotation of the sleeve, a push member attached to the sleeve so as to be rotatable around the sleeve and does not rotate even when the sleeve rotates, an operated unit extending in the front-rear direction and operated by the push member when the sleeve moves in the front-rear direction, and a gripping unit protruding from the front of the sleeve, rotatable together with the sleeve, and gripping the wire. The push member is disposed rearward of the fin member. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] JP 2009-275486 A Summary of the Invention [Problem to be solved by the invention]
[0004] In the rebar binding machine as described above, the operated unit is usually placed in front of the push member. Since the operated unit is operated by the push member to operate, it is necessary to design the space required to place the operated unit, taking into account the position of the operated unit before and after the operation. It is desirable to reduce the space required to place the operated unit and increase the degree of freedom in the placement of the operated unit. This specification discloses a technology that can increase the degree of freedom in the placement of the operated unit. [Means for solving the problem]
[0005] The rebar tying machine disclosed in this specification ties rebars using a wire. The rebar tying machine includes a rotatable screw shaft, a sleeve into which the screw shaft is inserted and which is movable and rotatable in the front-rear direction, a fin member attached to the sleeve and permits and prohibits rotation of the sleeve, a push member attached to the sleeve so as to be rotatable around the sleeve and does not rotate even when the sleeve rotates, an operated unit having a longitudinal direction in the front-rear direction and operated by the push member when the sleeve moves in the front-rear direction, and a gripping unit protruding from the front of the sleeve and rotatable together with the sleeve, which grips the wire. The push member is disposed forward of the fin member.
[0006] According to the above configuration, since the push member is disposed forward of the fin member, In comparison with a configuration in which the push member is disposed behind the fin member, the space required for arranging the operated unit can be made smaller in the front-rear direction, thereby increasing the degree of freedom in arranging the operated unit. [Brief description of the drawings]
[0007] [Figure 1] FIG. 1 is a perspective view of a reinforcing bar binding machine 2 of a first embodiment. [Diagram 2] FIG. 2 is a left side view of the reinforcing bar binding machine 2 of the first embodiment with the left housing 8 and reel cover 10 removed. [Diagram 3] 1 is a perspective view of the reinforcing bar binding machine 2 of the first embodiment with a reel cover 10 in an open state. [Figure 4] 2 is a cross-sectional view of the vicinity of a guide unit 42 in the reinforcing bar binding machine 2 of the first embodiment. [Diagram 5] FIG. 2 is a cross-sectional view of a cutting unit 44 and a twisting unit 46 of the first embodiment. [Figure 6]2 is a left side view of the vicinity of the twisting unit housing 14 in the reinforcing bar binding machine 2 of the first embodiment with the left housing 8 removed. FIG. [Figure 7] FIG. 2 is a cross-sectional view of a cutting unit 44 and a twisting unit 46 of the first embodiment. [Figure 8] FIG. 2 is a perspective view of a twisting unit 46 of the first embodiment. [Figure 9] FIG. 2 is a cross-sectional view of a torsion unit 46 of the first embodiment. [Figure 10] FIG. 2 is a perspective view of a rotation limiting unit 48 according to the first embodiment. [Figure 11] FIG. 2 is a cross-sectional view of a torsion unit 46 and a sensor unit 150 according to the first embodiment. [Figure 12] 2 is a perspective view of the vicinity of a gripping unit 100 in the twisting unit 46 of the first embodiment. FIG. [Figure 13] FIG. 2 is a perspective view of a right clamp member 154 according to the first embodiment. [Figure 14] FIG. 2 is a perspective view of a left clamp member 156 according to the first embodiment. [Figure 15] 13 is a cross-sectional view of the vicinity of a wire tip guide surface 190 in the left clamp member 156 of the first embodiment. FIG. [Figure 16] FIG. 2 is a side view of the wire W and the reinforcing bar R after the wire W has been twisted in the first embodiment. [Figure 17] 13 is a cross-sectional view of the vicinity of a wire tip guide surface 190 in the left clamp member 156 of the second embodiment. FIG. [Figure 18] 13 is an enlarged cross-sectional view of a wire tip guide surface 190 of the second embodiment when the tip of the wire W comes into contact with the wire tip guide surface 190. FIG. [Figure 19] 11 is a cross-sectional view of a first cutter 70 and a second cutter 72 of the second embodiment. FIG. [Figure 20] 13 is an enlarged cross-sectional view of a wire tip guiding surface 190 of the second embodiment when it comes into contact with a wire tip surface 300. FIG. [Figure 21] 11 is a cross-sectional view of a first cutter 70 and a second cutter 72 of a third embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0008] In the following, exemplary and non-limiting examples of the present invention will be described in detail with reference to the drawings. This detailed description is intended simply to provide those skilled in the art with details for implementing the preferred examples of the present invention, and is not intended to limit the scope of the present invention. In addition, the additional features and inventions disclosed below can be used separately or together with other features and inventions to provide further improved rebar binding machines, methods of manufacturing and using the same.
[0009] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to the practice of the invention in its broadest sense, but are specifically described only to illustrate representative embodiments of the invention. Furthermore, the various features of the representative embodiments described above and below, and the various features of those described in the independent and dependent claims, do not have to be combined in the exact embodiments described herein, or in the exact order listed, to provide additional and useful embodiments of the invention.
[0010] All features described in the specification and / or claims are intended to be disclosed individually and independently of one another as limitations to the original disclosure and claimed particulars, apart from any configuration of features described in the examples and / or claims. Furthermore, all numerical ranges and group or aggregate descriptions are intended to disclose their intermediate configurations as limitations to the original disclosure and claimed particulars.
[0011] In one or more embodiments, the operated unit may include an operated member that the push member can contact and that is operated by the push member when the member contacts the operated member, and a cutter that can cut a wire and that operates when the operated member is operated by the push member.
[0012] The cutter must be located near the wire to cut it. According to the above configuration, the push member is located forward of the fin member, so the distance between the push member and the reinforcing bar can be made shorter than in a configuration in which the push member is located rearward of the fin member. This allows the operated unit to be smaller in the front-rear direction.
[0013] In one or more embodiments, the operated unit may further include a link member connecting the operated member and the cutter.
[0014] According to the above configuration, the link member can be made smaller in the front-rear direction compared to a configuration in which the push member is disposed rearward of the fin member.
[0015] In one or more embodiments, the push member may be sandwiched between the sleeve and the fin member in the front-to-rear direction.
[0016] According to the above configuration, the push member can be attached to the sleeve with a simple structure.
[0017] In one or more embodiments, the rebar binding machine may further include a trigger that is depressed and operated by a user. The trigger may be aligned in the front-to-rear direction with the operated unit when the rebar binding machine is viewed in a direction perpendicular to the front-to-rear direction.
[0018] According to the above configuration, compared to a configuration in which the trigger is not aligned with the operated unit in the fore-and-aft direction when the rebar tying machine is viewed in a direction perpendicular to the fore-and-aft direction, it is possible to prevent the rebar tying machine from becoming larger in the direction perpendicular to the fore-and-aft direction.
[0019] (First embodiment) As shown in FIG. 1, the reinforcing bar binding machine 2 uses a wire W to bind a plurality of reinforcing bars R. In the reinforcing bar binding machine 2, wires W of various diameters (e.g., diameters of 0.5 mm to 2.5 mm) are used depending on the diameter of the reinforcing bars R to be used. For example, when binding a thin reinforcing bar R having a diameter of 16 mm or less (e.g., diameter 16 mm), a wire W having a diameter of 1.6 mm or less (e.g., 0.8 mm) is used, and when binding a thick reinforcing bar R having a diameter larger than 16 mm (e.g., diameters of 25 mm or 32 mm), a wire W having a diameter of 1.6 mm or more (e.g., 2.0 mm) is used. Hereinafter, the longitudinal direction of the twisting unit 46 (see FIG. 8) is referred to as the front-rear direction, the direction perpendicular to the front-rear direction is referred to as the up-down direction, and the direction perpendicular to the front-rear direction and the up-down direction is referred to as the left-right direction.
[0020] The rebar binding machine 2 includes a main body 4 and a battery pack BP. The main body 4 includes a right housing 6 that defines the outer shape of the right half of the main body 4, a left housing 8 that defines the outer shape of the left half of the main body 4, and a reel cover 10 that is rotatably attached to the lower front part of the left housing 8.
[0021] The main body 4 includes a twisting unit accommodating section 14, a grip section 16, a battery attachment section 18, a feeding unit accommodating section 20, and a reel accommodating section 22. The twisting unit accommodating section 14, the grip section 16, the battery attachment section 18, and the feeding unit accommodating section 20 are formed by the right housing 6 and the left housing 8. The reel accommodating section 22 is formed by the right housing 6, the left housing 8, and the reel cover 10.
[0022] As shown in Fig. 2, the twisting unit housing 14 extends in the front-rear direction. The grip portion 16 is disposed at the rear lower portion of the twisting unit housing 14. The grip portion 16 is held by a user. The longitudinal direction of the grip portion 16 is slightly inclined with respect to the up-down direction. A trigger 24 is attached to the upper front portion of the grip portion 16.
[0023] The battery mounting portion 18 is disposed at the lower end of the grip portion 16. The battery pack BP is detachably attached to the lower end of the battery mounting portion 18. The battery pack BP is attached to the battery mounting portion 18 by sliding the battery pack BP forward and downward relative to the battery mounting portion 18, and is removed from the battery mounting portion 18 by sliding the battery pack BP backward and upward relative to the battery mounting portion 18. The sliding direction of the battery pack BP is inclined with respect to the front-rear direction. The battery pack BP includes a secondary battery, for example, a lithium-ion battery.
[0024] The feeding unit accommodating section 20 is disposed in a front lower portion of the twisting unit accommodating section 14. The feeding unit accommodating section 20 is disposed in front of the grip section 16.
[0025] The reel accommodating portion 22 is disposed at the lower end of the feeding unit accommodating portion 20. In Fig. 2, the reel accommodating portion 22 is illustrated by a dashed line. As shown in Fig. 3, the reel accommodating portion 22 can accommodate a reel 28. The reel 28 includes a wire W and a bobbin 32 around which the wire W is wound. The reel 28 is rotatably supported in the reel accommodating portion 22. The reel 28 can be attached to and detached from the reel accommodating portion 22 when the reel cover 10 is opened relative to the left housing 8.
[0026] As shown in FIG. 2, the rebar binding machine 2 includes a control unit 38, a feed unit 40, a guide unit 42, a cutting unit 44, a twisting unit 46, and a rotation limiting unit 48 (see FIG. 10).
[0027] The control unit 38 is housed in the battery attachment portion 18. When the trigger 24 is pressed by a user, the control unit 38 executes a binding operation of binding the reinforcing bar R with the wire W.
[0028] The feed unit 40 is accommodated in the feed unit accommodating section 20. The feed unit 40 includes a feed motor 50 and a feed roller unit 52. The feed motor 50 is, for example, a brushless motor. The feed motor 50 rotates by power supplied from the battery pack BP. When the feed motor 50 rotates, the feed roller unit 52 operates. The feed roller unit 52 pulls out the wire W from the bobbin 32 by rotating, and feeds it forward and upward toward the reinforcing bar R. The feed roller unit 52 also pulls the wire W back toward the bobbin 32 by rotating.
[0029] The guide unit 42 is fixed to the front end of the twisting unit housing 14. The guide unit 42 includes an upper curl guide 56 and a lower curl guide 58. As shown in FIG. 4, the upper curl guide 56 opens downward. The upper curl guide 56 has an upper wire passage 60 having an upwardly convex curved shape. The lower curl guide 58 is disposed below the upper curl guide 56. The lower curl guide 58 opens upward. The lower curl guide 58 has a lower wire passage 62.
[0030] The wire W fed by the feeding unit 40 (see FIG. 2) is fed to the upper wire passage 60. As the wire W passes through the upper wire passage 60 from the rear side to the front side, the wire W is given a downward curl by the upper curl guide 56. The wire W that has passed through the upper wire passage 60 is fed to the lower wire passage 62. After passing through the lower wire passage 62 from the front side to the rear side, the wire W is fed toward the upper rear side. The wire W is wound around the reinforcing bar R by being guided by the upper curl guide 56 and the lower curl guide 58. Hereinafter, the trajectory along which the tip of the wire W moves by being guided by the upper curl guide 56 and the lower curl guide 58 may be referred to as the winding trajectory WO.
[0031] As shown in Fig. 2, the cutting unit 44 is housed in the twisting unit housing 14. As shown in Fig. 5, the cutting unit 44 includes a base member 66, a guide member 68 (see Fig. 4), a first cutter 70, a second cutter 72, a first lever member 74, a second lever member 76, and a link member 78.
[0032] The guide member 68 shown in Fig. 4 is fixed to the base member 66. The guide member 68 has a guide hole 68a. The width of the guide hole 68a in the front-rear direction and the width of the guide hole 68a in the left-right direction each gradually narrows from the bottom to the top and then becomes constant. The wire W fed by the feeding unit 40 (see Fig. 2) passes through the guide hole 68a.
[0033] 5, the first cutter 70 is fixed to the base member 66. The first cutter 70 has a first cutting opening 80. The first cutter 70 is inserted into the second cutter 72. The second cutter 72 is supported by the first cutter 70 so as to be rotatable around the first cutter 70. The second cutter 72 has a second cutting opening 82.
[0034] As shown in Fig. 4, the guide hole 68a, the first cutting opening 80, and the second cutting opening 82 are disposed on a path along which the wire W is fed from the feeding unit 40 toward the upper curl guide 56. Before the cutting unit 44 cuts the wire W, the first cutting opening 80 and the second cutting opening 82 are in communication with each other. When the wire W is fed from the feeding unit 40 toward the upper curl guide 56, the wire W is guided by the guide hole 68a and passes through the first cutting opening 80 and the second cutting opening 82. When the second cutter 72 rotates in the first direction D1 relative to the first cutter 70 while the wire W passes through the first cutting opening 80 and the second cutting opening 82, the first cutter 70 and the second cutter 72 come into contact with the wire W and cut the wire W.
[0035] As shown in FIG. 5, the first lever member 74 and the second lever member 76 are fixed to each other via a first shaft 86 and a second shaft 88. The first lever member 74 and the second lever member 76 are rotatable around the first shaft 86. The first shaft 86 is fixed to the left housing 8 (see FIG. 1). The second shaft 88 is not fixed to the left housing 8. When the first lever member 74 and the second lever member 76 rotate around the first shaft 86, the second shaft 88 moves together with the first lever member 74 and the second lever member 76. The first lever member 74 has a first protrusion 90 that is operated by the torsion unit 46. The first protrusion 90 is located at the upper end of the first lever member 74. The second lever member 76 has a second protrusion 92 that is operated by the torsion unit 46. The second protrusion 92 is located at the upper end of the second lever member 76. The second protrusion 92 is disposed forward of the first protrusion 90 .
[0036] The rear end of the link member 78 is attached to the second shaft 88. The front end of the link member 78 is attached to the second cutter 72. The link member 78 connects the second shaft 88 and the second cutter 72. The link member 78 has an elongated shape. As shown in FIG. 6, the link member 78 overlaps with the trigger 24 in the front-rear direction when the reinforcing bar binding machine 2 is viewed from the rear to the front. The link member 78 is aligned with the trigger 24 in the front-rear direction when the reinforcing bar binding machine 2 is viewed from the left to the right. The link member 78 is located near the upper end of the grip portion 16 in the up-down direction. The upper end of the trigger 24 is located above the lower end of the link member 78.
[0037] As shown in FIG. 5, before the cutting unit 44 cuts the wire W, the second shaft 88 is located forward of the first shaft 86. As shown in FIG. 7, when the second projection 92 is operated toward the front side, the second shaft 88 moves toward the rear side, and the link member 78 moves toward the rear side. As a result, the second cutter 72 rotates in the first direction D1, and the wire W is sandwiched between the first cutter 70 and the second cutter 72 and cut. Also, as shown in FIG. 5, when the first projection 90 is operated toward the rear side after the wire W is cut, the second shaft 88 moves toward the front side, and the link member 78 moves toward the front side. As a result, the second cutter 72 rotates in the second direction D2 opposite to the first direction D1. As a result, the second cutter 72 returns to the initial state in which the first cutting opening 80 and the second cutting opening 82 communicate with each other.
[0038] As shown in Fig. 6, the twisting unit 46 is housed in the twisting unit housing 14. The twisting unit 46 includes a twisting motor 96, a sleeve unit 98, and a gripping unit 100. The twisting motor 96 is disposed above the grip portion 16. The twisting motor 96 is, for example, a brushless motor. The twisting motor 96 rotates by power supplied from the battery pack BP. The rotation of the twisting motor 96 is transmitted to the sleeve unit 98.
[0039] As shown in FIG. 8, the sleeve unit 98 includes a screw shaft 102, an inner sleeve 104 (see FIG. 9), an outer sleeve 106, a fin member 108, and a push member 110. As shown in FIG.
[0040] As shown in Fig. 9, the screw shaft 102 extends along a central axis CX extending in the front-rear direction. The screw shaft 102 rotates about the central axis CX as the torsion motor 96 rotates. A ball groove 114 is formed on the outer circumferential surface of the screw shaft 102. The ball groove 114 extends spirally in the front-rear direction. A ball 116 is movably held in the ball groove 114.
[0041] The inner sleeve 104 includes a cylindrical portion 118 and a flange portion 120. The cylindrical portion 118 extends along the central axis CX. The screw shaft 102 is inserted into the cylindrical portion 118. The cylindrical portion 118 has a ball retaining hole 122 penetrating the cylindrical portion 118 in the thickness direction. The ball retaining hole 122 rotatably retains the ball 116 in the ball groove 114. The flange portion 120 protrudes from the rear end of the cylindrical portion 118 toward the radially outer side of the cylindrical portion 118.
[0042] The outer sleeve 106 includes a cylindrical portion 124 and a flange portion 126. The cylindrical portion 124 extends along the central axis CX. The cylindrical portion 118 of the inner sleeve 104 is inserted into the cylindrical portion 124. The cylindrical portion 124 is fixed to the cylindrical portion 118 by a set screw 128. This allows the outer sleeve 106 to move in the front-rear direction and rotate together with the inner sleeve 104. The rear end of the cylindrical portion 124 abuts against the flange portion 120 from the front side. The cylindrical portion 124 contacts the ball 116 to prevent the ball 116 from slipping out of the ball groove 114 and the ball retaining hole 122. The flange portion 126 protrudes radially outward from the outer circumferential surface of the cylindrical portion 124. The flange portion 126 is disposed forward of the rear end of the cylindrical portion 124.
[0043] The outer sleeve 106 is inserted into the fin member 108. The fin member 108 is attached to the outer sleeve 106. The fin member 108 includes a base 130 and eight fin portions 132. The base 130 has a substantially cylindrical shape. The base 130 abuts against the flange portion 120 of the inner sleeve 104 from the front side. The fin portions 132 protrude radially outward from the outer circumferential surface of the base 130. As shown in FIG. 8, the eight fin portions 132 are arranged around the outer circumferential surface of the base 130 at intervals of 45 degrees from each other.
[0044] The fin portion 132 cooperates with a rotation limiting unit 48 shown in FIG. 10 to permit and prohibit the rotation of the outer sleeve 106. The configuration of the rotation limiting unit 48 will be described first. As shown in FIG. 10, the rotation limiting unit 48 includes a base member 136, a lower stopper 138, an upper stopper 140, a lower torsion spring 142, and an upper torsion spring 144. The lower stopper 138 is supported to be swingable on the lower part of the base member 136 via a lower swing shaft 146. The lower stopper 138 includes a restricting piece 138a. The restricting piece 138a is located on the upper part of the lower stopper 138. The lower torsion spring 142 biases the restricting piece 138a in a direction that opens outward (i.e., in a direction in which the restricting piece 138a moves away from the base member 136). The upper stopper 140 is supported to be able to swing on the upper part of the base member 136 via an upper swing shaft 148. The upper stopper 140 is provided with a restricting piece 140a. The restricting piece 140a is located at the lower part of the upper stopper 140. The front end of the restricting piece 140a is disposed forward of the front end of the restricting piece 138a. The rear end of the restricting piece 140a is disposed forward of the rear end of the restricting piece 138a. The upper torsion spring 144 biases the restricting piece 140a in a direction that opens outward (i.e., in a direction in which the restricting piece 140a moves away from the base member 136).
[0045] With respect to the lower stopper 138, when the screw shaft 102 rotates around the central axis CX in a clockwise direction D3 (see FIG. 8) as viewed from the rear side, the fin portion 132 abuts against the restricting piece 138a from above, thereby prohibiting the rotation of the outer sleeve 106. At this time, the inner sleeve 104, the outer sleeve 106, and the fin member 108 move forward as the balls 116 (see FIG. 9) move within the ball grooves 114 (see FIG. 9) as the screw shaft 102 rotates. On the other hand, when the screw shaft 102 rotates around the central axis CX in a counterclockwise direction D4 (see FIG. 8) as viewed from the rear side, the fin portion 132 pushes the restricting piece 138a inward even when it abuts against the restricting piece 138a. At this time, the rotation of the outer sleeve 106 is not inhibited, and the inner sleeve 104, the outer sleeve 106 and the fin member 108 rotate together with the screw shaft 102 in the counterclockwise direction D4 around the central axis CX.
[0046] With respect to the upper stopper 140, when the screw shaft 102 rotates around the central axis CX in a clockwise direction D3 (see FIG. 8) as viewed from the rear side, the fin portion 132 pushes the restricting piece 140a inward even when it abuts against the restricting piece 140a. At this time, the rotation of the outer sleeve 106 is not prohibited, and the inner sleeve 104, the outer sleeve 106, and the fin member 108 rotate around the central axis CX in the clockwise direction D3 together with the screw shaft 102. On the other hand, when the screw shaft 102 rotates around the central axis CX in a counterclockwise direction D4 (see FIG. 8) as viewed from the rear side, when the fin portion 132 abuts against the restricting piece 140a from below, the rotation of the outer sleeve 106 is prohibited. At this time, as the screw shaft 102 rotates, the balls 116 (see FIG. 9) move within the ball grooves 114 (see FIG. 9), causing the inner sleeve 104, the outer sleeve 106 and the fin member 108 to move rearward.
[0047] Returning to FIG. 9, the push member 110 will be described. The push member 110 has a substantially plate shape. The cylindrical portion 124 of the outer sleeve 106 is inserted into the push member 110. The push member 110 is attached to the cylindrical portion 124. The push member 110 can rotate around the outer circumferential surface of the cylindrical portion 124. The push member 110 is sandwiched between the rear end of the flange portion 126 and the front end of the base portion 130 of the fin member 108. The push member 110 is disposed on the front side (i.e., the reinforcing bar R side) of the fin member 108. The push member 110 moves in the front-rear direction together with the outer sleeve 106. In addition, the rotation of the push member 110 relative to the right housing 6 (see FIG. 1) and the left housing 8 (see FIG. 1) is restricted. The push member 110 does not rotate around the central axis CX even if the outer sleeve 106 rotates.
[0048] As shown in Fig. 7, when the push member 110 moves forward together with the outer sleeve 106, it comes into contact with the second protrusion 92 of the second lever member 76 and pushes the second protrusion 92 forward. This causes the second cutter 72 to rotate in the first direction D1. Also, as shown in Fig. 5, when the push member 110 moves rearward together with the outer sleeve 106, it comes into contact with the first protrusion 90 of the first lever member 74 and pushes the first protrusion 90 rearward. This causes the second cutter 72 to rotate in the second direction D2.
[0049] As shown in FIG. 11, the push member 110 includes a permanent magnet 110a. The permanent magnet 110a is located at the lower end of the push member 110. A sensor unit 150 is disposed at a position facing the permanent magnet 110a in the up-down direction. The sensor unit 150 includes a sensor board 150a and two magnetic sensors 150b and 150c. The magnetic sensors 150b and 150c are fixed on the sensor board 150a. The magnetic sensor 150b is disposed at a position facing the permanent magnet 110a when the grip unit 100 is in the initial state. The magnetic sensor 150c is disposed forward of the magnetic sensor 150b. The magnetic sensor 150c is disposed at a position facing the permanent magnet 110a when the wire W is clamped between a left clamp member 156 and a clamp shaft 152, which will be described later. When the magnetic sensors 150b and 150c face the permanent magnet 110a, they detect the magnetism from the permanent magnet 110a, thereby allowing the sensor unit 150 to detect the front-rear position of the push member 110 (i.e., the front-rear position of the outer sleeve 106).
[0050] 12, the gripping unit 100 protrudes forward (towards the rebar R) from the front of the sleeve unit 98. The gripping unit 100 extends along a central axis CX. The gripping unit 100 includes a clamp shaft 152, a right clamp member 154, and a left clamp member 156.
[0051] As shown in Fig. 9, the clamp shaft 152 is inserted into the inner sleeve 104 and the outer sleeve 106 from the front side. The clamp shaft 152 is disposed on the central axis CX. The rear end of the clamp shaft 152 is attached to the front end of the screw shaft 102 via an attachment piece 157 (see Fig. 7). The attachment piece 157 prevents the clamp shaft 152 from moving in the front-rear direction relative to the screw shaft 102. The clamp shaft 152 is rotatable around the screw shaft 102.
[0052] As shown in FIG. 12, the clamp shaft 152 includes a flat plate portion 158, a fitting hole 160, and an opening 162. The flat plate portion 158 is located at the front of the clamp shaft 152. The flat plate portion 158 has a generally flat plate shape that is aligned in the up-down direction and the front-rear direction. The fitting hole 160 penetrates the flat plate portion 158 in the thickness direction (left-right direction in FIG. 12). The fitting hole 160 is fitted with a pin 164. The opening 162 is located rearward of the flat plate portion 158. The opening 162 penetrates the clamp shaft 152 in the left-right direction and extends in the front-rear direction.
[0053] The right clamp member 154 is attached to the clamp shaft 152 so as to pass through an opening 162 of the clamp shaft 152 from right to left. The left clamp member 156 is attached to the clamp shaft 152 so as to pass through the opening 162 from left to right.
[0054] As shown in FIG. 13, the right clamp member 154 includes a base portion 166, a pin holding portion 168, a lower protruding portion 170, an abutting portion 172, a rear guard portion 174, and a front guard portion 176. The base portion 166 has a generally flat plate shape along the front-rear direction and the left-right direction. The base portion 166 is formed with cam holes 166a and 166b. The cam holes 166a and 166b extend forward from the rear end, then bend and extend in the right front direction, further bend and extend forward, then bend and extend in the right front direction, and further bend and extend forward. The pin holding portion 168 is disposed near the right front end of the base portion 166. The pin holding portion 168 is disposed on the upper surface of the base portion 166. The pin holding portion 168 slidably holds the pin 164 (see FIG. 12). The lower protrusion 170 protrudes downward from the right front end of the base portion 166. The abutment portion 172 protrudes downward and left from the lower end of the lower protrusion 170. The rear guard portion 174 protrudes leftward from the rear end of the abutment portion 172. The front guard portion 176 protrudes leftward from the front end of the abutment portion 172.
[0055] As shown in FIG. 14, the left clamp member 156 includes a base portion 178, an upper protrusion 180, an abutment portion 182, an upper guard portion 184, and a front guard portion 186. The base portion 178 has a generally flat plate shape along the front-rear direction and the left-right direction. The base portion 178 is formed with cam holes 178a and 178b. The cam holes 178a and 178b extend forward from their rear ends, then bend to extend forward to the left, and then bend to extend forward again. The upper protrusion 180 protrudes upward from the left front end of the base portion 178. The abutment portion 182 protrudes upward from the upper end of the upper protrusion 180. The upper guard portion 184 protrudes rightward from the upper end of the abutment portion 182. The front guard portion 186 protrudes rightward from the front end of the upper protrusion 180 and the front end of the abutment portion 182. The front guard portion 186 is connected to the front end of the upper guard portion 184 .
[0056] As shown in FIG. 15, the upper guard part 184 has a wire tip guide surface 190. The wire tip guide surface 190 corresponds to the lower surface of the upper guard part 184. The wire tip guide surface 190 has a planar shape. The wire tip guide surface 190 extends from the rear end toward the front upper side. The wire tip guide surface 190 is inclined with respect to the central axis CX so as to move away from the central axis CX from the rear end toward the front end. In other words, the distance between the wire tip guide surface 190 and the central axis CX is minimum at the rear end of the wire tip guide surface 190, increases from the rear end toward the front end of the wire tip guide surface 190, and is maximum at the front end of the wire tip guide surface 190.
[0057] The wire tip guide surface 190 is inclined with respect to a first imaginary plane 192 along the front-rear direction and the left-right direction. The inclination angle A1 of the wire tip guide surface 190 with respect to the first imaginary plane 192 is greater than 0 degrees. The inclination angle A1 is an angle between the wire tip guide surface 190 and the first imaginary plane 192 measured in a clockwise direction from the wire tip guide surface 190 when the rebar binding machine 2 is viewed from the right side to the left side. The inclination angle A1 may be 5 degrees or more. In this embodiment, the inclination angle A1 is 10 degrees. The wire tip guide surface 190 is inclined with respect to a second imaginary plane 194 along the left-right direction and the up-down direction. The inclination angle A2 of the wire tip guide surface 190 with respect to the second imaginary plane 194 is greater than 90 degrees. The inclination angle A2 is an angle between the wire tip guide surface 190 and the second imaginary plane 194 measured in a clockwise direction from the wire tip guide surface 190 when the rebar binding machine 2 is viewed from the right side to the left side. The inclination angle A2 may be equal to or greater than 95 degrees. In this embodiment, the inclination angle A2 is 100 degrees.
[0058] The wire tip guide surface 190 is disposed on the winding track WO of the tip of the wire W when the wire W is guided around the reinforcing bar R by the guide unit 42 (see FIG. 4). An angle A3 between the wire tip guide surface 190 and the winding track WO is greater than 90 degrees. The angle A3 is the angle between the wire tip guide surface 190 and the winding track WO measured in the clockwise direction from the wire tip guide surface 190 when the reinforcing bar binding machine 2 is viewed from the right side to the left side. The angle A3 may be 95 degrees or more. In this embodiment, the angle A3 is 100 degrees. The angle A3 is approximately the same as the inclination angle A2.
[0059] The front guard portion 186 has a guard surface 196. The guard surface 196 corresponds to the rear surface of the front guard portion 186. The guard surface 196 is disposed forward of the wire tip guide surface 190 (the reinforcing bar R side). The guard surface 196 is disposed between the wire tip guide surface 190 and the reinforcing bar R in the front-rear direction. The guard surface 196 has a flat plate shape. The guard surface 196 overlaps with the wire tip guide surface 190 when the left clamp member 156 is viewed from the front to the rear. The guard surface 196 is approximately parallel to the second imaginary plane 194 and approximately perpendicular to the first imaginary plane 192.
[0060] As shown in Fig. 12, the base portion 166 of the right clamp member 154 and the base portion 178 of the left clamp member 156 are inserted into the opening 162 of the clamp shaft 152. In this state, the engagement pin 200 is disposed in the cam hole 166a and the cam hole 178a (see Fig. 14). Also, as shown in Fig. 8, the engagement pin 202 is disposed in the cam hole 166b (see Fig. 13) and the cam hole 178b. The engagement pins 200 and 202 are held by the outer sleeve 106. When the outer sleeve 106 moves in the front-rear direction relative to the clamp shaft 152, the engagement pin 200 moves in the front-rear direction within the cam hole 166a and the cam hole 178a, and the engagement pin 202 moves in the front-rear direction within the cam hole 166b and the cam hole 178b.
[0061] As shown in Fig. 12, in the initial state where the clamp shaft 152 protrudes forward from the outer sleeve 106, the right clamp member 154 is located at the rightmost position relative to the clamp shaft 152. In this state, a right wire passage 204 through which the wire W can pass is formed between the lower protrusion 170 of the right clamp member 154 and the flat plate portion 158 of the clamp shaft 152. When the outer sleeve 106 moves forward relative to the clamp shaft 152 from this state, the right clamp member 154 moves leftward relative to the clamp shaft 152, the leftward movement is temporarily stopped, and then the right clamp member 154 moves leftward again. As a result, the wire W is clamped between the abutment portion 172 and the flat plate portion 158 of the right clamp member 154, and the front end of the right wire passage 204 is covered by the front guard portion 176.
[0062] In addition, in an initial state in which the clamp shaft 152 protrudes forward from the outer sleeve 106, the left clamp member 156 is located at the leftmost position relative to the clamp shaft 152. In this state, a left wire passage 206 through which the wire W can pass is formed between the upper protrusion 180 of the left clamp member 156 and the flat plate portion 158 of the clamp shaft 152. When the outer sleeve 106 moves forward relative to the clamp shaft 152 from this state, the left clamp member 156 moves rightward relative to the clamp shaft 152. As a result, the wire W is clamped between the abutment portion 182 and the flat plate portion 158 of the left clamp member 156, and the front end of the left wire passage 206 is covered by the front guard portion 186.
[0063] The behavior of the tip of the wire W fed by the feeding unit 40 as it winds around the reinforcing bar R will be described. As shown in FIG. 4, the tip of the wire W fed by the feeding unit 40 (see FIG. 2) is first guided by the guide hole 68a and passes through the first cutting opening 80 and the second cutting opening 82. Next, the tip of the wire W passes through the right wire passage 204 and is guided by the upper curl guide 56 and passes through the upper wire passage 60. Thereafter, the tip of the wire W passes through the lower wire passage 62 and moves rearward and upward. Next, as shown in FIG. 12, the tip of the wire W passes through the left wire passage 206 and comes into contact with the wire tip guide surface 190.
[0064] As shown in FIG. 15, when the tip of the wire W abuts against the wire tip guide surface 190, it is guided by the wire tip guide surface 190 and moves on the wire tip guide surface 190. Here, in the first comparative example in which the wire tip guide surface 190 is not inclined with respect to the central axis CX, and in the second comparative example in which the wire tip guide surface 190 is inclined with respect to the central axis CX so as to move away from the central axis CX as it moves from the front side to the rear side, the tip of the wire W moves on the wire tip guide surface 190 from the front side to the rear side. At this time, the tip of the wire W moves in a direction away from the reinforcing bar R. On the other hand, in this embodiment, the tip of the wire W moves in a moving direction D5 from the rear side to the front side. At this time, the tip of the wire W moves in a direction approaching the reinforcing bar R. After moving on the wire tip guide surface 190, the tip of the wire W abuts against the guard surface 196. This prevents the tip of the wire W from coming out from between the left clamp member 156 and the clamp shaft 152. Thereafter, the feeding unit 40 (see FIG. 2) stops feeding the wire W. This causes the wire W to be wound around the reinforcing bar R. The tip of the wire W is positioned on the guard surface 196. Furthermore, the distance between the tip of the wire W and the reinforcing bar R in this embodiment is shorter than the distance between the tip of the wire W and the reinforcing bar R in the first and second comparative examples.
[0065] Next, the operation of gripping and twisting the wire W will be described. After the wire W is wound around the reinforcing bar R, the outer sleeve 106 shown in FIG. 11 moves forward relative to the clamp shaft 152 as the screw shaft 102 rotates in the clockwise direction D3 (see FIG. 3). As a result, the left clamp member 156 moves rightward relative to the clamp shaft 152, and the tip of the wire W is clamped between the left clamp member 156 and the clamp shaft 152. In addition, the right clamp member 154 moves leftward relative to the clamp shaft 152. At this time, the wire W is not clamped between the right clamp member 154 and the clamp shaft 152. Next, the feed unit 40 shown in FIG. 2 pulls the wire W back toward the bobbin 32, so that the wire W around the reinforcing bar R contracts in diameter and comes into contact with the reinforcing bar R. Thereafter, the outer sleeve 106 shown in FIG. 7 moves further forward relative to the clamp shaft 152 as the screw shaft 102 rotates. At this time, the push member 110 pushes the second protrusion 92 of the second lever member 76 forward. As a result, the wire W is cut by the first cutter 70 and the second cutter 72 at a location near the boundary between the first cutting opening 80 and the second cutting opening 82. Next, the outer sleeve 106 shown in FIG. 8 moves further forward relative to the clamp shaft 152 as the screw shaft 102 rotates. As a result, the right clamp member 154 moves further leftward relative to the clamp shaft 152, and the wire W is clamped between the right clamp member 154 and the clamp shaft 152 near the cutting location. Next, the outer sleeve 106 moves further forward relative to the clamp shaft 152 as the screw shaft 102 rotates. When the fin portion 132 of the fin member 108 moves forward of the front end of the regulating piece 138a (see FIG. 10) of the lower stopper 138 of the rotation limiting unit 48, the fin portion 132 no longer abuts against the regulating piece 138a. Therefore, rotation of the outer sleeve 106 is permitted, and the gripping unit 100 rotates in the clockwise direction D3 around the central axis CX together with the outer sleeve 106. As a result, the wire W is twisted, and the reinforcing bars R are bound together using the wire W.
[0066] As described above, before the wire W is twisted, the distance between the tip of the wire W in this embodiment and the reinforcing bar R is shorter than the distance between the tip of the wire W and the reinforcing bar R in the first and second comparative examples. Therefore, as shown in Fig. 16, even after the wire W is twisted, the ear height L1 of the wire W, which represents the distance between the tip of the wire W in this embodiment and the reinforcing bar R, is shorter than the ear height L2 of the wire W in the first and second comparative examples.
[0067] (effect) The reinforcing bar binding machine 2 of this embodiment binds reinforcing bars R using a wire W. The reinforcing bar binding machine 2 includes a rotatable screw shaft 102, an outer sleeve 106 (an example of a sleeve) into which the screw shaft 102 is inserted and which is movable and rotatable in the front-rear direction, a fin member 108 attached to the outer sleeve 106 and allows and prohibits the rotation of the outer sleeve 106, a push member 110 attached to the outer sleeve 106 so as to be rotatable around the outer sleeve 106 and does not rotate even when the outer sleeve 106 rotates, a cutting unit 44 (an example of an operated unit) having a longitudinal direction in the front-rear direction and operated by the push member 110 when the outer sleeve 106 moves in the front-rear direction, and a gripping unit 100 protruding from the front of the outer sleeve 106, rotatable together with the outer sleeve 106, and gripping the wire W. The push member 110 is disposed forward of the fin member 108.
[0068] According to the above configuration, since the push member 110 is disposed forward of the fin members 108, the space required for disposing the cutting unit 44 can be made smaller in the front-rear direction compared to a configuration in which the push member 110 is disposed rearward of the fin members 108. This allows for greater freedom in disposing the cutting unit 44.
[0069] The cutting unit 44 also includes a first lever member 74 or a second lever member 76 (an example of an operated member) against which the push member 110 can come into contact and which is operated by the push member 110 when in contact, and a second cutter 72 (an example of a cutter) capable of cutting the wire W and which operates when the first lever member 74 or the second lever member 76 is operated by the push member 110.
[0070] The second cutter 72 needs to be disposed near the wire W in order to cut the wire W. According to the above configuration, the push member 110 is disposed forward of the fin members 108, and therefore the distance between the push member 110 and the reinforcing bar R is shorter than in a configuration in which the push member 110 is disposed rearward of the fin members 108. This allows the cutting unit 44 to be smaller in the front-rear direction.
[0071] Moreover, the cutting unit 44 further includes a link member 78 that connects the first lever member 74 or the second lever member 76 to the second cutter 72 .
[0072] According to the above configuration, the link member 78 can be made smaller in the front-rear direction compared to a configuration in which the push member 110 is disposed rearward of the fin member 108.
[0073] Moreover, the push member 110 is sandwiched between the outer sleeve 106 and the fin member 108 in the front-rear direction.
[0074] According to the above configuration, the push member 110 can be attached to the outer sleeve 106 with a simple structure.
[0075] The rebar binding machine 2 further includes a trigger 24 that is pressed by a user. The trigger 24 is aligned with the cutting unit 44 when the rebar binding machine 2 is viewed in the left-right direction perpendicular to the front-rear direction.
[0076] According to the above configuration, compared to a configuration in which the trigger 24 is not aligned with the cutting unit 44 in the front-to-rear direction when the rebar binding machine 2 is viewed in the left-to-right direction perpendicular to the front-to-rear direction, it is possible to prevent the rebar binding machine 2 from becoming larger in the direction perpendicular to the front-to-rear direction.
[0077] (Second Example) In the second embodiment, only the points that are different from the first embodiment will be described. As shown in Fig. 17, the wire tip guide surface 190 is approximately parallel to a first imaginary plane 192. The distance between the wire tip guide surface 190 and the central axis CX is approximately the same between the front end and the rear end of the wire tip guide surface 190. The wire tip guide surface 190 is approximately perpendicular to a second imaginary plane 194. In addition, the wire tip guide surface 190 is approximately perpendicular to a guard surface 196.
[0078] As shown in FIG. 18, the tip of the wire W has a wire tip surface 300. The wire tip surface 300 is inclined with respect to the longitudinal axis 304 of the wire W. The inclination angle A4 of the wire tip surface 300 with respect to the longitudinal axis 304 is greater than 90 degrees. The inclination angle A4 is an angle measured between the wire tip surface 300 and the longitudinal axis 304 when the wire W is divided in half by a plane including the longitudinal axis 304. The inclination angle A4 is also an angle obtained by adding 90 degrees to the angle between the wire tip surface 300 and the cutting surface when the wire W is cut by a cutting surface perpendicular to the longitudinal axis 304. The inclination angle A4 may be 95 degrees or more. In this embodiment, the inclination angle A4 is 100 degrees. The tip of the wire W is sharply pointed. The wire tip surface 300 is formed by cutting the wire W by the first cutter 70 and the second cutter 72.
[0079] As shown in FIG. 19, the rotation axis RX of the second cutter 72 passes through the first cutting opening 80 of the first cutter 70. A portion of the first cutting opening 80 is defined by a first cutting surface 310. The first cutting surface 310 is located at the end of the first cutting opening 80 on the second cutting opening 82 side. The first cutting surface 310 is connected to the outer peripheral surface 312 of the first cutter 70. The first cutting surface 310 is approximately perpendicular to the longitudinal direction of the first cutting opening 80. A portion of the second cutting opening 82 of the second cutter 72 is defined by a second cutting surface 314. The second cutter 72 has an opposing surface 316 that faces the outer peripheral surface 312 of the first cutter 70, and the second cutting surface 314 is connected to the opposing surface 316. The angle between the second cutting surface 314 and the opposing surface 316 is an acute angle, for example, 70 degrees or less. The wire W is cut by being sandwiched between the first cutting surface 310 and the second cutting surface 314.
[0080] Next, the behavior of the tip of the wire W moving on the wire tip guide surface 190 will be described. As shown in FIG. 18, when the corner of the tip of the wire W abuts against the wire tip guide surface 190, the wire tip surface 300 is inclined with respect to the wire tip guide surface 190. The inclination angle A5 of the wire tip surface 300 with respect to the wire tip guide surface 190 is greater than 0 degrees. The inclination angle A5 is an angle measured between the wire tip guide surface 190 and the wire tip surface 300. The inclination angle A5 may be 5 degrees or more. In this embodiment, the inclination angle A5 is 10 degrees. As shown in FIG. 20, next, the wire tip surface 300 abuts against the wire tip guide surface 190 with a surface. At this time, the longitudinal axis 304 of the wire W is inclined with respect to the wire tip guide surface 190 at an inclination angle A4. Next, as shown in FIG. 17, the wire tip surface 300 moves on the wire tip guide surface 190 from the rear side to the front side in a moving direction D6. At this time, the wire tip surface 300 moves in a direction approaching the reinforcing bar R. After moving on the wire tip guide surface 190, the wire tip surface 300 abuts against the guard surface 196. Therefore, as shown in Fig. 16, after the wire W is twisted, the ear height L1 of the wire W in this embodiment is shorter than the ear height L2 of the wire W in the first and second comparative examples.
[0081] (Third Example) In the third embodiment, only the points different from the second embodiment will be described. In the third embodiment, as shown in FIG. 21, the first cutting opening 80 of the first cutter 70 is offset from the rotation axis RX of the second cutter 72. The first cutting opening 80 is disposed rearward of the rotation axis RX. The first cutting opening 80 extends linearly. The central axis 400 of the first cutting opening 80 is inclined at an acute angle with respect to a tangent 402 of the outer peripheral surface 312 at the intersection between the central axis 400 and the outer peripheral surface 312 of the first cutter 70. The wire W is sandwiched between the first cutting surface 310 and the second cutting surface 314 and cut, so that the wire tip surface 300 (see FIG. 18) is inclined with respect to the longitudinal axis 304 (see FIG. 18) of the wire W.
[0082] (Modification) In one embodiment, the push member 110 may operate components other than the cutting unit 44 .
[0083] In one embodiment, the push member 110 may be attached to the outer sleeve 106 by a screw or other member.
[0084] In one embodiment, the grip portion 16 may extend in the left-right direction.
[0085] In one embodiment, the rebar binding machine 2 may include a power cord connectable to an external power source instead of the battery pack BP. In this case, the rebar binding machine 2 operates using power supplied from the external power source via the power cord.
[0086] In one embodiment, the reel housing 22 may be located at the rear end of the twisting unit housing 14 .
[0087] In one embodiment, the gripping unit 64 may include a pair of openable and closable hook members. In this case, the pair of hook members may grip the wire W when closed and release the wire W when opened. [Explanation of symbols]
[0088] 2: Rebar binding machine 14: Twisting unit housing 16: Grip section 22: Reel storage section 24: Trigger 28: Reel 32: Bobbin 40: Feed unit 42: Guidance unit 44: Cutting unit 46: Torsion unit 48: Rotation limiting unit 70: First cutter 72: 2nd cutter 74: First lever member 76: Second lever member 78: Link member 90: First protrusion 92: Second protrusion 100: Grasping unit 102: Screw shaft 104: Inner sleeve 106: Outer sleeve 108: Fin member 110: Push member 132: Fin section 152: Clamp shaft 154: Right side clamp member 156: Left side clamp member 190: Wire tip guide surface 192: First virtual surface 194: Second virtual surface 196: Guard surface 300: Wire tip surface 304: Longitudinal axis A1, A2, A4, A5: Inclination angle A3 :Angle AX: Longitudinal axis BP: Battery pack CX: Central axis D5, D6: Movement direction L1, L2: Ear height R: Reinforcement bar W: Wire WO: Wound orbit
Claims
1. A rebar binding machine that binds rebars using wire, a rotatable screw shaft; a sleeve into which the screw shaft is inserted and which is movable in the forward and backward directions and rotatable; a fin member attached to the sleeve for allowing and prohibiting rotation of the sleeve; a push member attached to the sleeve so as to be rotatable around the sleeve, and which does not rotate even when the sleeve rotates; an operated unit having a longitudinal direction in the front-rear direction and operated by the push member when the sleeve moves in the front-rear direction; a gripping unit protruding from a front portion of the sleeve, rotatable together with the sleeve, and configured to grip the wire; The reinforcing bar tying machine, wherein the push member is disposed forward of the fin member.
2. The operated unit is an operated member that the push member can contact and that is operated by the push member when the push member contacts the operated member; The reinforcing bar binding machine according to claim 1, further comprising: a cutter capable of cutting the wire and operating when the operated member is operated by the push member.
3. The reinforcing bar binding machine according to claim 2 , wherein the operated unit further comprises a link member connecting the operated member and the cutter.
4. The reinforcing bar binding machine according to claim 1 , wherein the push member is sandwiched between the sleeve and the fin member in the front-rear direction.
5. The device further includes a trigger that is depressed by a user, The reinforcing bar binding machine according to claim 1 , wherein the trigger is aligned with the operated unit in the front-to-rear direction when the reinforcing bar binding machine is viewed in a direction perpendicular to the front-to-rear direction.