Rebar Tying Machines and Reels

Abstract

To provide a technique capable of detecting specific information on a reel before the reel rotates once.SOLUTION: The rebar binding machine includes: a reel that includes a bobbin having parts to be detected and a wire wounded on the bobbin; a reel mounting part for mounting the reel in a spinning manner; a feeding part that feeds out the wire wound on the bobbin around the rebar; a twisting part that twists the wire around the rebar; multiple detection parts for detecting parts to be detected; and a supporting part that supports the reel mounting part, the feeding part, the twisting part, and multiple detection parts. The multiple detection parts are arranged along the reel rotation direction to detect the parts to be detected while the reel is spinning.SELECTED DRAWING: Figure 26

Description

[Technical Field]

[0001] The present invention relates to a rebar binding machine and a reel. [Background technology]

[0002] Patent Document 1 discloses a rebar tying machine. The rebar tying machine includes a bobbin with a detection target and a reel with a wire wound around the bobbin, a reel mounting section for rotatably mounting the reel, a feeding section for feeding the wire wound around the bobbin around the rebar, a twisting section for twisting the wire around the rebar, a photointerrupter for detecting the detection target, and a support section for supporting the reel mounting section, feeding section, twisting section, and photointerrupter. The detection target is an annular rib centered on the central axis of the bobbin. The photointerrupter detects the annular rib while the reel is rotating. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-24908 Summary of the Invention [Problem to be solved by the invention]

[0004] In the rebar tying machine described above, the photointerrupter cannot detect the annular rib unless the reel rotates one full revolution. As a result, specific information about the reel cannot be detected unless the reel rotates one full revolution. This specification discloses a technology that can detect specific information about the reel before the reel rotates one full revolution. [Means for solving the problem]

[0005] The reinforcing bar tying machine disclosed in this specification includes a bobbin having a detectable portion, a reel having a wire wound on the bobbin, a reel attachment part for rotatably attaching the reel, a feeding part that feeds out the wire wound on the bobbin around the reinforcing bar, a twisting part that twists the wire around the reinforcing bar, multiple detecting parts that detect the detectable portion, the reel attachment part, the feeding part, the twisting part, and a support part that supports the multiple detecting parts. The multiple detecting parts are arranged along the rotation direction of the reel and detect the detectable portion while the reel is rotating.

[0006] According to the above configuration, since the multiple detecting units are arranged along the rotation direction of the reel, the detected unit can be detected before the reel makes one rotation, thereby making it possible to detect specific information about the reel before the reel makes one rotation.

[0007] The reinforcing bar tying machine disclosed in this specification includes a reel attachment section for rotatably attaching a reel that includes a bobbin having a detectable portion and a wire wound on the bobbin, a feeding section that feeds out the wire wound on the bobbin around the reinforcing bar, a twisting section that twists the wire around the reinforcing bar, multiple detecting sections that detect the detectable portion, the reel attachment section, the feeding section, the twisting section, and a support section that supports the multiple detecting sections. The multiple detecting sections are arranged along the rotation direction of the reel and detect the detectable portion while the reel is rotating.

[0008] According to the above configuration, the same effects as those of the above reinforcing bar binding machine can be achieved.

[0009] The reel disclosed in this specification is rotatably attached to a reel attachment part of a rebar tying machine for use. The reel includes a bobbin having a detectable part and a wire wound around the bobbin. The rebar tying machine includes multiple detectors arranged along the rotation direction of the reel. The detectable part holds type information indicating the type of reel. The detectable part is detected by the multiple detectors while the reel is rotating.

[0010] According to the above configuration, since the multiple detectors are arranged along the rotation direction of the reel, when the reel is attached to the reel attachment part of the reinforcing bar binding machine, the detectable part is detected before the reel makes one rotation. This allows the reinforcing bar binding machine to detect specific information about the reel before the reel makes one rotation. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view of a reinforcing bar binding machine 2 of a first embodiment, seen from above and behind the left. [Figure 2] 1 is a perspective view of a reinforcing bar binding machine 2 of a first embodiment as seen from above on the front right. [Figure 3] 1 is a side view showing the internal configuration of a reinforcing bar binding machine 2 of a first embodiment. [Figure 4] FIG. 2 is a perspective view of a feeding section 38 of the first embodiment. [Figure 5] FIG. 2 is a perspective view of a feeding section 38 and a reel holder 10 according to the first embodiment. [Figure 6] 2 is a cross-sectional view of the vicinity of the upper front part of the reinforcing bar binding machine 2 of the first embodiment. FIG. [Figure 7] 10 is a side view showing a state before a first lever member 76 and a second lever member 78 rotate in the cutting unit 44 of the first embodiment. FIG. [Figure 8] 10 is a side view showing the state after the first lever member 76 and the second lever member 78 have rotated in the cutting unit 44 of the first embodiment. FIG. [Figure 9] FIG. 2 is a perspective view of a twisted portion 46 of the first embodiment. [Figure 10] 1 is a cross-sectional view of a torsion motor 86, a speed reducer 88, and a holder 90 of the first embodiment. [Figure 11] FIG. 1 is an exploded perspective view of a carrier sleeve 98, a clutch plate 100, and a screw shaft 102 of the first embodiment. [Figure 12] FIG. 2 is a perspective view of a clamp shaft 110 according to the first embodiment. [Figure 13] 1 is a perspective view of the torsion portion 46 of the first embodiment, showing a state in which a right clamp 112 and a left clamp 114 are attached to a clamp shaft 110. FIG. [Figure 14] FIG. 2 is a perspective view of a right clamp 112 according to the first embodiment. [Figure 15] FIG. 2 is a perspective view of a left clamp 114 of the first embodiment. [Figure 16] FIG. 2 is a perspective view of a torsion motor 86, a speed reducer 88, and a holder 90 of the first embodiment. [Figure 17] FIG. 2 is a perspective view of a rotation limiting portion 92 of the first embodiment. [Figure 18] FIG. 2 is a cross-sectional view of the reel holder 10 and the reel 33 of the first embodiment. [Figure 19] FIG. 2 is a perspective view of a bobbin 160 of the reel 33 of the first embodiment. [Figure 20] 1 is a perspective view of the reel holder 10 of the first embodiment with the main cover 28 removed. FIG. [Figure 21] 1 is a perspective view of the reel holder 10 of the first embodiment with an auxiliary cover 30 removed. FIG. [Figure 22] FIG. 2 is a perspective view of a right reel attachment portion 190 and a type detection device 220 according to the first embodiment. [Figure 23] FIG. 2 is an exploded perspective view of a turntable 198 and a type detection device 220 according to the first embodiment. [Figure 24] FIG. 2 is a perspective view of the right reel attachment portion 190 and the support member 228 of the first embodiment. [Figure 25] 10 is a diagram showing the reel 33, the type detection mechanism 158, and the right reel attachment portion 190 of the first embodiment as viewed from above. [Figure 26] FIG. 10 is a view of the type detection mechanism 158 and the right reel attachment portion 190 of the first embodiment as seen from the right side. [Figure 27] 1 is a cross-sectional view of the reel 33, the type detection mechanism 158, and the right reel attachment portion 190 of the first embodiment. [Figure 28] 10 is a signal chart detected by the type detection magnetic sensor 222 and the rotation detection magnetic sensor 248 in the first embodiment. [Figure 29] FIG. 10 is a view of the type detection mechanism 158 and the right reel attachment portion 190 of the second embodiment as seen from the right side. [Figure 30]10 is a signal chart detected by a type detection magnetic sensor 222 and a rotation detection magnetic sensor 248 according to the second embodiment. [Figure 31] FIG. 10 is a view of the type detection mechanism 158 and the right reel attachment portion 190 of the third embodiment as seen from the right side. DETAILED DESCRIPTION OF THE INVENTION

[0012] Representative, non-limiting examples of the present invention will now 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 preferred examples of the present invention, and is not intended to limit the scope of the present invention. Additionally, additional features and inventions disclosed below can be used separately or in conjunction with other features and inventions to provide further improved rebar tying machines and reels, and methods of making and using the same.

[0013] Furthermore, the combinations of features and steps disclosed in the following detailed description are not essential to practicing the invention in its broadest sense, but are described solely to specifically illustrate exemplary embodiments of the invention. Furthermore, the various features of the exemplary embodiments described above and below, and those described in the independent and dependent claims, do not necessarily 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.

[0014] All features described in this specification and / or claims are intended to be disclosed individually and independently of one another as limitations on 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 aggregation descriptions are intended to disclose intermediate configurations thereof as limitations on the original disclosure and claimed particulars.

[0015] In one or more embodiments, the reel mount may include a turntable rotatably supported on the support, and the bobbin may be secured to the turntable when the reel is mounted on the reel mount.

[0016] According to the above configuration, since the turntable is supported by the support part, it is not necessary to attach or detach the turntable from the support part. This makes it possible to prevent the position of the rotation axis of the turntable from shifting, thereby making it possible to prevent the position of the rotation axis of the reel from shifting.

[0017] In one or more embodiments, the rebar tying machine may further include a movable member movably supported on the turntable. The detected portion may include a protrusion. When the reel is not attached to the reel attachment portion, the movable member may be disposed in an initial position. When the reel is attached to the reel attachment portion, the protrusion may press the movable member toward the attachment position. Each of the multiple detection portions may detect the detected portion by detecting the movable member in the attachment position.

[0018] According to the above configuration, specific information about the reel can be detected before the reel makes one rotation using a simple configuration for detecting the position of the movable member.

[0019] In one or more embodiments, the rebar binding machine may further include a type-detecting magnet fixed to the movable member, and each of the plurality of detection units may include a type-detecting magnetic sensor that can detect whether the movable member is in the attachment position by detecting the type-detecting magnet.

[0020] When an optical sensor, such as a photointerrupter, is used, detection sensitivity decreases when dirt due to foreign matter or the like adheres to the photointerrupter or when disturbance light is irradiated onto the photointerrupter. With the above configuration, the type-detecting magnetic sensor detects, for example, fluctuations in magnetism caused by the type-detecting magnet to detect whether the movable member is in the attached position. Compared to when a photointerrupter is used, it is possible to detect whether the movable member is in the attached position without being affected by dirt due to foreign matter or disturbance light.

[0021] In one or more embodiments, the rebar tying machine may further include a biasing member that biases the movable member toward the initial position when the reel is removed from the reel mount.

[0022] According to the above configuration, when the reel is removed from the reel attachment portion, the movable member can be returned to the initial position.

[0023] In one or more embodiments, the bobbin may further include a body portion around which the wire is wound and a flange portion disposed at one end of the body portion. The protrusion may protrude outward from an outer surface of the flange portion along the rotation axis of the reel. The turntable may include a receiving portion that receives and engages with the protrusion.

[0024] According to the above configuration, the reel can be fixed to the turntable with a simple configuration.

[0025] In one or more embodiments, each of the plurality of detectors may include a rotation detector that detects the rotation angle of the reel.

[0026] According to the above configuration, the detection unit can be used to detect not only the type of reel but also the rotation of the reel.

[0027] In one or more embodiments, the rebar binding machine may include a rotation detection magnet that rotates integrally with the reel, and the rotation detection unit may include a rotation detection magnetic sensor that detects the rotation angle of the reel by detecting the rotation detection magnet.

[0028] When an optical sensor, such as a photointerrupter, is used, detection sensitivity decreases when dirt due to foreign matter or the like adheres to the photointerrupter or when disturbance light is irradiated onto the photointerrupter. With the above configuration, the rotation detection magnetic sensor can detect magnetic fluctuations caused by, for example, a rotation detection magnet and detect the rotation angle of the reel. Compared to when a photointerrupter is used, the rotation angle of the reel can be detected without being affected by dirt due to foreign matter or disturbance light.

[0029] In one or more embodiments, the plurality of detectors may be fixed to the support.

[0030] According to the above configuration, the positions of the plurality of detecting portions do not change even when the reel rotates, and the plurality of detecting portions can detect the detected portion more accurately.

[0031] In one or more embodiments, the plurality of detectors may include N detectors, where N may be an integer greater than or equal to 2. Adjacent detectors may be spaced apart along the rotational direction at intervals corresponding to an angle of 360 / N.

[0032] According to the above configuration, specific information about the reel can be detected by rotating the reel through an angle of 360 / N.

[0033] In one or more embodiments, the plurality of detectors may include N detectors, where N may be an integer greater than or equal to 2. The maximum distance between adjacent detectors may correspond to a particular angle greater than 360 / N along the direction of rotation.

[0034] According to the above configuration, specific information about the reel can be detected by rotating the reel through a specific angle that is smaller than 360 degrees.

[0035] (First Example) As shown in Fig. 1, the rebar binding machine 2 binds a plurality of rebars R using a wire W. For example, the rebar binding machine 2 binds small rebars R having a diameter of 16 mm or less, and large rebars R having a diameter greater than 16 mm (for example, a diameter of 25 mm or 32 mm) using the wire W. The diameter of the wire W is, for example, between 0.5 mm and 2.0 mm.

[0036] As shown in FIG. 1, the rebar tying machine 2 includes a main body 4, a grip 6, a battery attachment portion 8, a battery pack B, and a reel holder 10. The grip 6 is held by an operator. The grip 6 is disposed at the lower rear portion of the main body 4. The grip 6 is formed integrally with the main body 4. A trigger 12 is provided at the upper front portion of the grip 6. A trigger switch 14 (see FIG. 3) that detects whether the trigger 12 is pressed is disposed inside the grip 6. The battery attachment portion 8 is disposed at the lower portion of the grip 6. The battery attachment portion 8 is formed integrally with the grip 6. The battery pack B can be attached and detached by sliding it relative to the battery attachment portion 8. The battery pack B includes a secondary battery such as a lithium-ion battery. The reel holder 10 is disposed at the lower front portion of the main body 4. The reel holder 10 is disposed forward of the grip 6. In this embodiment, the longitudinal direction of a torsion portion 46 (described later) 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.

[0037] The rebar binding machine 2 includes a housing 16. The housing 16 forms part of the support unit 15. As shown in FIG. 2, the housing 16 includes a right housing 18, a left housing 20, and a motor cover 22. The right housing 18 defines the shapes of the main body 4, the grip 6, and the right half of the battery mounting unit 8. The left housing 20 defines the shapes of the main body 4, the grip 6, and the left half of the battery mounting unit 8. The motor cover 22 is attached to the outside of the right housing 18. As shown in FIG. 1, an operation display unit 24 is disposed on the upper rear side of the left housing 20. The operation display unit 24 includes a main power switch 24a and a main power LED 24b. The main power switch 24a receives a user's operation to switch the main power of the rebar binding machine 2 on / off. The main power LED 24b indicates the on / off state of the main power of the rebar binding machine 2.

[0038] As shown in FIG. 2, the reel holder 10 includes a holder housing 26, a main cover 28, and an auxiliary cover 30. The holder housing 26 and the auxiliary cover 30 form part of the support portion 15. The holder housing 26 is fixed to the front lower portion of the main body 4 and to the front portion of the battery mounting portion 8. The left end of the holder housing 26 is open. The main cover 28 is attached to the holder housing 26 so as to be rotatable around a rotation shaft 26a at the bottom of the holder housing 26. The main cover 28 is biased in the opening direction by a torsion spring 31 (see FIG. 3). A closed state detection sensor (not shown) that detects whether the main cover 28 is closed is attached to the holder housing 26. The auxiliary cover 30 covers the right surface of the holder housing 26. The auxiliary cover 30 defines an auxiliary space 30a between the right surface of the holder housing 26 and the auxiliary cover 30.

[0039] As shown in FIG. 1, a lock lever 32 for holding the main cover 28 in a closed state is disposed on the lower front side of the left housing 20. When the lock lever 32 is rotated, the main cover 28 is opened relative to the holder housing 26 by the biasing force of a torsion spring 31 (see FIG. 3). When the main cover 28 is closed, the holder housing 26 and the main cover 28 define a storage space 26b (see FIG. 3). A reel 33 (see FIG. 3) equipped with a wire W is disposed in the storage space 26b. As shown in FIG. 2, a hole 26c is formed on the front surface of the holder housing 26. A user can check the remaining amount of wire W on the reel 33 by looking at the reel 33 through the hole 26c.

[0040] As shown in Fig. 3, the rebar binding machine 2 includes a control circuit board 36. The control circuit board 36 is disposed inside the battery mounting portion 8. The control circuit board 36 is electrically connected to the battery pack B, the trigger switch 14, and the operation display unit 24 by wiring not shown. The control circuit board 36 is also electrically connected to a closed state detection sensor (not shown) attached to the holder housing 26 by wiring not shown.

[0041] The rebar binding machine 2 includes a feeding unit 38, a guide unit 40, a cutting unit 44, and a twisting unit 46. The feeding unit 38 is disposed inside the front lower part of the main body 4. The guide unit 40 is disposed at the front part of the main body 4. The cutting unit 44 is disposed inside the lower part of the main body 4. The twisting unit 46 is disposed inside the main body 4.

[0042] As shown in Fig. 4, the feed section 38 includes a feed motor 50, a speed reducer 52, and a feed unit 54. The feed motor 50 is, for example, a brushless motor. The feed motor 50 is disposed to the right of the right housing 18 (see Fig. 2) and is covered by a motor cover 22 (see Fig. 2). The feed motor 50 is electrically connected to the control circuit board 36 by wiring (not shown). The feed motor 50 operates using power supplied from a battery pack B (see Fig. 2).

[0043] The speed reducer 52 includes, for example, a planetary gear mechanism. The speed reducer 52 reduces the rotation speed of the feed motor 50.

[0044] The feed unit 54 includes a base member 56, a guide member 58, a drive gear 60, a first feed gear 62, a second feed gear 64, a release lever 66, and a compression spring 68. The guide member 58 is fixed to the base member 56. The guide member 58 has a guide hole 58a. The guide hole 58a has a tapered shape that is wide at the bottom and narrow at the top. A wire W is inserted into the guide hole 58a.

[0045] Rotation is transmitted to the drive gear 60 from the reduction gear unit 52. The first feed gear 62 is rotatably supported by the base member 56. The first feed gear 62 meshes with the drive gear 60. The first feed gear 62 rotates due to the rotation of the drive gear 60. The first feed gear 62 has a groove 62a. The groove 62a is formed on the outer peripheral surface of the first feed gear 62 in a direction along the rotation direction of the first feed gear 62. The second feed gear 64 meshes with the first feed gear 62. The second feed gear 64 is rotatably supported by a release lever 66. The second feed gear 64 has a groove 64a. The groove 64a is formed on the outer peripheral surface of the second feed gear 64 in a direction along the rotation direction of the second feed gear 64. The release lever 66 is swingably supported by the base member 56 via a swing shaft 66a. The compression spring 68 biases the release lever 66 relative to the right housing 18 (see FIG. 2) in a direction in which the second feed gear 64 approaches the first feed gear 62. This presses the second feed gear 64 against the first feed gear 62. As a result, the wire W is sandwiched between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64. As shown in FIG. 5, when the lock lever 32 rotates in a direction in which it releases the retention of the main cover 28, the lower end of the release lever 66 is pushed in by the lock lever 32 and moves toward the right housing 18. This causes the second feed gear 64 to move away from the first feed gear 62. In this state, the user can set the wire W of the reel 33 (see FIG. 4) between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64. As shown in FIG. 2, the front surface of the left housing 20 and the front surface of the motor cover 22 are formed with windows 16a through which the user can see the area where the first feed gear 62 and the second feed gear 64 mesh.

[0046] As shown in Fig. 4, the wire W is moved by rotating the feed motor 50 while the wire W is sandwiched between the groove 62a of the first feed gear 62 and the groove 64a of the second feed gear 64. In this embodiment, when the feed motor 50 rotates forward, the drive gear 60 rotates in direction D1 shown in Fig. 4, and the wire W is fed from the reel 33 toward the guide unit 40. When the feed motor 50 rotates reversely, the drive gear 60 rotates in direction D2 shown in Fig. 4, and the wire W is pulled back from the feed unit 38 toward the reel 33.

[0047] As shown in FIG. 6, the guide unit 40 includes an upper curl guide 70 and a lower curl guide 71. The upper curl guide 70 and the lower curl guide 71 are disposed in the front portion of the main body 4. The lower end of the upper curl guide 70 opens downward, thereby forming an upper wire passage 70a in the upper curl guide 70. The lower curl guide 71 is disposed below the upper curl guide 70. The upper end of the lower curl guide 71 opens upward, thereby forming a lower wire passage 71a in the lower curl guide 71.

[0048] The wire W fed from the feeding section 38 (see FIG. 4) is fed into the upper wire passage 70a. The wire W passes through the upper wire passage 70a from the rear side to the front side. At this time, the wire W is given a downward curl. After passing through the upper wire passage 70a, the wire W is fed into the lower wire passage 71a. The wire W passes through the lower wire passage 71a from the front side to the rear side. As a result, the wire W is wound around the reinforcing bar R.

[0049] As shown in FIG. 7 , the cutting unit 44 includes a fixed cutter member 72, a movable cutter member 74, a first lever member 76, a second lever member 78, a link member 80, and a torsion spring 82. As shown in FIG. 6 , the fixed cutter member 72 and the movable cutter member 74 are disposed on a path along which the wire W is fed from the feed unit 38 toward the guide unit 40. The fixed cutter member 72 has a hole 72a through which the wire W can pass. The movable cutter member 74 is supported by the fixed cutter member 72 so as to be rotatable and slideable around the fixed cutter member 72. The movable cutter member 74 has a hole 74a through which the wire W can pass. As shown in FIG. 7 , when the hole 72a of the fixed cutter member 72 and the hole 74a of the movable cutter member 74 are in communication with each other (hereinafter also referred to as a communication state), the wire W can pass through the hole 72a of the fixed cutter member 72 and the hole 74a of the movable cutter member 74. When the movable cutter member 74 rotates from this state relative to the fixed cutter member 72 in the direction D3 shown in FIG. 6 (hereinafter also referred to as the cutting state), the wire W is cut by the fixed cutter member 72 and the movable cutter member 74.

[0050] As shown in FIG. 7 , the first lever member 76 and the second lever member 78 are fixed to each other. The first lever member 76 and the second lever member 78 are pivotable around an axis RX. The lower ends of the first lever member 76 and the second lever member 78 are pivotally connected to the rear ends of a link member 80. The front end of the link member 80 is pivotally connected to the lower end of the movable cutter member 74. The rear end of the link member 80 is biased forward by a torsion spring 82. When the lower ends of the first lever member 76 and the second lever member 78 pivot forward, the link member 80 moves forward, and the fixed cutter member 72 and the movable cutter member 74 are connected to each other. As shown in FIG. 8 , when the lower ends of the first lever member 76 and the second lever member 78 pivot rearward, the link member 80 moves rearward, and the fixed cutter member 72 and the movable cutter member 74 are disconnected.

[0051] As shown in Fig. 9, the torsion unit 46 includes a torsion motor 86, a speed reducer 88, a holder 90, and a rotation limiter 92. The torsion motor 86 is, for example, a brushless motor. The torsion motor 86 is fixed to the right housing 18 (see Fig. 1) and the left housing 20 (see Fig. 1). The torsion motor 86 is electrically connected to the control circuit board 36 (see Fig. 3) by wiring (not shown). The torsion motor 86 operates using power supplied from the battery pack B (see Fig. 1).

[0052] The speed reducer 88 is fixed to the right housing 18 and the left housing 20. The speed reducer 88 includes, for example, a planetary gear mechanism. The speed reducer 88 reduces the rotation speed of the torsion motor 86.

[0053] As shown in FIG. 10, the retaining portion 90 includes a bearing box 96, a carrier sleeve 98, a clutch plate 100, a screw shaft 102, an inner sleeve 104, an outer sleeve 106, a push plate 108, a clamp shaft 110, a right clamp 112, and a left clamp 114.

[0054] The bearing box 96 is fixed to the speed reducer 88. The bearing box 96 rotatably supports the carrier sleeve 98 via a bearing 96a. Rotation is transmitted to the carrier sleeve 98 from the speed reducer 88. When the torsion motor 86 rotates forward, the carrier sleeve 98 rotates in the left-handed direction as viewed from the rear. When the torsion motor 86 rotates reversely, the carrier sleeve 98 rotates in the right-handed direction as viewed from the rear.

[0055] As shown in FIG. 11 , a clutch groove 98a extending in the front-rear direction is formed on the inner surface of the rear portion of the carrier sleeve 98. A first wall portion 98b and a second wall portion 98c are formed at the front end of the clutch groove 98a. The distance in the front-rear direction from the rear end of the carrier sleeve 98 to the first wall portion 98b is shorter than the distance in the front-rear direction from the rear end of the carrier sleeve 98 to the second wall portion 98c. A clutch plate 100 is disposed inside the carrier sleeve 98. A clutch piece 100a corresponding to the clutch groove 98a is formed on the clutch plate 100. The clutch plate 100 is biased rearward relative to the carrier sleeve 98 by a compression spring 116 disposed inside the carrier sleeve 98. The clutch plate 100 can advance relative to the carrier sleeve 98 to a position where the clutch piece 100a abuts against the first wall portion 98b of the clutch groove 98a. When the wire W is twisted, the carrier sleeve 98 rotates in the left-handed direction relative to the clutch plate 100 when viewed from the rear, allowing the clutch plate 100 to move forward relative to the carrier sleeve 98 to a position where the clutch piece 100a abuts against the second wall portion 98c of the clutch groove 98a.

[0056] The rear portion 102a of the screw shaft 102 is inserted into the carrier sleeve 98 from the front side and is fixed to the clutch plate 100. A flange 102c protruding in the radial direction is formed between the rear portion 102a and the front portion 102b of the screw shaft 102. A spiral ball groove 102d is formed on the outer circumferential surface of the front portion 102b of the screw shaft 102. An engagement portion 102e having a smaller diameter than the front portion 102b is formed at the front end of the screw shaft 102.

[0057] As shown in FIG. 10, a compression spring 118 is attached to the front portion 102b of the screw shaft 102. The front portion 102b of the screw shaft 102 is inserted into the inner sleeve 104 from the rear side. The inner sleeve 104 is formed with a ball hole 104a that holds a ball 120. The ball 120 fits into a ball groove 102d of the screw shaft 102. A flange 104b that protrudes in the radial direction is formed at the rear end of the inner sleeve 104. The inner sleeve 104 is inserted into the outer sleeve 106 from the rear side. The outer sleeve 106 is fixed to the inner sleeve 104. When rotation of the outer sleeve 106 is permitted by the rotation limiting portion 92 (see FIG. 17), the inner sleeve 104 and the outer sleeve 106 rotate integrally when the screw shaft 102 rotates. When the rotation limiting portion 92 prohibits rotation of the outer sleeve 106, the inner sleeve 104 and the outer sleeve 106 move in the front-to-rear direction relative to the screw shaft 102 as the screw shaft 102 rotates. Specifically, when the torsion motor 86 rotates forward and the screw shaft 102 rotates in the left-hand direction as viewed from the rear, the inner sleeve 104 and the outer sleeve 106 move forward relative to the screw shaft 102. On the other hand, when the torsion motor 86 rotates backward and the screw shaft 102 rotates in the right-hand direction as viewed from the rear, the inner sleeve 104 and the outer sleeve 106 move rearward relative to the screw shaft 102. The push plate 108 is disposed between the rear end of the outer sleeve 106 and the flange 104b of the inner sleeve 104. Therefore, when the inner sleeve 104 and the outer sleeve 106 move in the front-to-rear direction, the push plate 108 also moves in the front-to-rear direction. A slit 106a is formed in the front portion of the outer sleeve 106, extending from the front end of the outer sleeve 106 toward the rear side.

[0058] The clamp shaft 110 is inserted into the inner sleeve 104 from the front side. The engagement portion 102e of the screw shaft 102 is inserted into the rear end of the clamp shaft 110. The clamp shaft 110 is fixed to the screw shaft 102. As shown in FIG. 12, the clamp shaft 110 is formed with a flat plate portion 110a, an opening 110b, and a flange 110c. The flat plate portion 110a is located at the front end of the clamp shaft 110 and has a flat plate shape that extends in the up-down and front-rear directions. The flat plate portion 110a is formed with a hole 110d into which a pin 122 (see FIG. 13) fits. The opening 110b is located rearward of the flat plate portion 110a. The opening 110b penetrates the clamp shaft 110 in the left-right direction and extends in the front-rear direction. The flange 110c is located rearward of the opening 110b and protrudes radially.

[0059] 13, the right clamp 112 is attached to the clamp shaft 110 so as to pass through the opening 110b of the clamp shaft 110 from right to left. The left clamp 114 is attached to the clamp shaft 110 below the right clamp 112 so as to pass through the opening 110b of the clamp shaft 110 from left to right.

[0060] As shown in FIG. 14, the right clamp 112 includes a base portion 112a, a lower protrusion 112b, an upper protrusion 112c, a contact portion 112d, an upper guard portion 112e, and a front guard portion 112f. The base portion 112a has a flat plate shape extending in the front-rear and left-right directions. The lower protrusion 112b is located at the right end of the base portion 112a and protrudes downward from the base portion 112a. The upper protrusion 112c is located at the right front end of the base portion 112a and protrudes upward from the base portion 112a. The contact portion 112d protrudes leftward from the upper end of the upper protrusion 112c. The upper guard portion 112e protrudes leftward from the upper end of the contact portion 112d. The front guard portion 112f protrudes leftward from the front ends of the upper protrusion 112c and the abutment portion 112d. Cam holes 112g and 112h are formed in the base portion 112a. The cam holes 112g and 112h extend forward from the rear end to the front end, then bend and extend toward the right front side, and then bend again and extend forward.

[0061] As shown in FIG. 15, the left clamp 114 includes a base portion 114a, a pin holding portion 114b, a lower protrusion 114c, a contact portion 114d, a rear guard portion 114e, and a front guard portion 114f. The base portion 114a has a flat plate shape extending in the front-rear and left-right directions. The pin holding portion 114b is disposed at the left front end of the base portion 114a and slidably holds the pin 122 (see FIG. 13) above the base portion 114a. The lower protrusion 114c is disposed at the left front end of the base portion 114a and protrudes downward from the base portion 114a. The contact portion 114d protrudes toward the right from the lower end of the lower protrusion 114c. The rear guard portion 114e protrudes toward the right from the rear end of the contact portion 114d. The front guard portion 114f protrudes to the right from the front end of the abutment portion 114d. Cam holes 114g and 114h are formed in the base portion 114a. The cam holes 114g and 114h are shaped so that, from the rear end to the front end, they first extend forward, then bend and extend toward the left front side, then bend and extend toward the front side, bend again and extend toward the left front side, and then bend and extend toward the front side.

[0062] 13, when the right clamp 112 and the left clamp 114 are attached to the clamp shaft 110, the cam sleeve 124 is disposed so as to pass through the cam holes 112g and 114g, and the cam sleeve 126 is disposed so as to pass through the cam holes 112h and 114h. In addition, the support pin 128 is disposed so as to pass through the cam sleeve 124, and the support pin 130 is disposed so as to pass through the cam sleeve 126. An annular cushion 131 is attached between the right clamp 112, the left clamp 114, and the flange 110c of the clamp shaft 110.

[0063] 9, with the clamp shaft 110 attached to the inner sleeve 104, the right clamp 112 and the left clamp 114 fit into the slits 106a of the outer sleeve 106, and the support pins 128, 130 are connected to the outer sleeve 106. When the clamp shaft 110 moves in the front-to-rear direction relative to the outer sleeve 106, the cam sleeve 124 attached to the support pin 128 moves in the front-to-rear direction within the cam holes 112g, 114g, and the cam sleeve 126 attached to the support pin 130 moves in the front-to-rear direction within the cam holes 112h, 114h, causing the right clamp 112 and the left clamp 114 to move in the left-to-right direction.

[0064] As shown in FIG. 13 , in the initial state in which the clamp shaft 110 protrudes forward from the outer sleeve 106, the right clamp 112 is positioned at the rightmost position relative to the left clamp 114. In this state, a right wire passage 132 through which the wire W can pass is formed between the upper protrusion 112c of the right clamp 112 and the flat plate portion 110a of the clamp shaft 110, and the upper side of the right wire passage 132 is covered by the upper guard portion 112e. This state of the right clamp 112 is called the fully open state. When the outer sleeve 106 moves forward relative to the clamp shaft 110 from this state, the right clamp 112 moves leftward toward the clamp shaft 110. In this state, the wire W is clamped between the lower end of the abutment portion 112d of the right clamp 112 and the upper end of the flat plate portion 110a of the clamp shaft 110, and the front side of the right wire passage 132 is covered by the front guard portion 112f. This state of the right clamp 112 is called a fully closed state.

[0065] In the initial state in which the clamp shaft 110 protrudes forward from the outer sleeve 106, the left clamp 114 is positioned at the leftmost position relative to the clamp shaft 110. In this state, a left wire passage 134, through which the wire W can pass, is formed between the lower protrusion 114c of the left clamp 114 and the flat plate portion 110a of the clamp shaft 110. This state of the left clamp 114 is called the fully open state. When the outer sleeve 106 moves forward relative to the clamp shaft 110 from this state, the left clamp 114 moves to the right toward the clamp shaft 110. In this state, the wire W can still pass through the left wire passage 134, but the rear side of the left wire passage 134 is covered by the rear guard portion 114e and the front side of the left wire passage 134 is covered by the front guard portion 114f. This state of the left clamp 114 is called the half-open state. From this state, when the outer sleeve 106 moves further forward relative to the clamp shaft 110, the left clamp 114 moves further to the right toward the clamp shaft 110. In this state, the wire W is clamped between the upper end of the abutment portion 114d of the left clamp 114 and the lower end of the flat plate portion 110a of the clamp shaft 110. This state of the left clamp 114 is called the fully closed state.

[0066] The wire W fed from the feed section 38 (see FIG. 6) to the guide section 40 (see FIG. 6) passes through the left wire passage 134 before reaching the guide section 40. Therefore, when the left clamp 114 is fully closed and the wire W is cut by the cutting section 44 (see FIG. 6), the left clamp 114 and the clamp shaft 110 hold the end of the wire W wound around the reinforcing bar R.

[0067] Furthermore, the wire W guided by the guide portion 40 passes through the right wire passage 132. Therefore, when the right clamp 112 is fully closed, the tip of the wire W wound around the reinforcing bar R is held by the right clamp 112 and the clamp shaft 110.

[0068] As shown in FIG. 16 , fins 138 are formed on the outer surface of the rear of the outer sleeve 106. The fins 138 extend in the front-rear direction. In this embodiment, eight fins 138 are arranged at 45-degree intervals on the outer peripheral surface of the outer sleeve 106. In this embodiment, the eight fins 138 include seven short fins 138a and one long fin 138b. The length of the long fin 138b in the front-rear direction is longer than the length of the short fin 138a in the front-rear direction. In the front-rear direction, the rear end of the long fin 138b is located at the same position as the rear end of the short fin 138a. In the front-rear direction, the front end of the long fin 138b is located forward of the front end of the short fin 138a.

[0069] The rotation limiting portion 92 is disposed at a position corresponding to the fin 138 of the outer sleeve 106. The rotation limiting portion 92 cooperates with the fin 138 to permit or prohibit rotation of the outer sleeve 106. As shown in FIG. 17 , the rotation limiting portion 92 includes a base member 140, an upper stopper 142, a lower stopper 144, and torsion springs 146 and 148. The base member 140 is fixed to the right housing 18 (see FIG. 1 ). The upper stopper 142 is supported on an upper portion of the base member 140 via a swing shaft 140a so as to be able to swing. The upper stopper 142 includes a restricting piece 142a. The restricting piece 142a is located below the upper stopper 142. The torsion spring 146 biases the restricting piece 142a in a direction that opens it outward (i.e., in a direction that moves the restricting piece 142a away from the base member 140). The lower stopper 144 is supported to be able to swing on the lower part of the base member 140 via a swing shaft 142b. The lower stopper 144 is provided with a restricting piece 144a. The restricting piece 144a is located at the upper part of the lower stopper 144. The rear end of the restricting piece 144a is located forward of the rear end of the restricting piece 142a. The torsion spring 148 biases the restricting piece 144a in a direction that opens it outward (i.e., in a direction that moves the restricting piece 144a away from the base member 140).

[0070] Regarding the upper stopper 142, when the torsion motor 86 (see FIG. 10) rotates forward and the screw shaft 102 (see FIG. 10) rotates in a left-handed direction as viewed from the rear, the fin 138 (see FIG. 16) of the outer sleeve 106 comes into contact with the restricting piece 142a, and the upper stopper 142 prohibits the rotation of the outer sleeve 106. On the other hand, when the torsion motor 86 rotates reversely and the screw shaft 102 rotates in a right-handed direction as viewed from the rear, the fin 138 of the outer sleeve 106 comes into contact with the restricting piece 142a and pushes the restricting piece 142a in. In this case, the upper stopper 142 does not prohibit the rotation of the outer sleeve 106.

[0071] With regard to the lower stopper 144, when the torsion motor 86 rotates forward and the screw shaft 102 rotates in a left-handed direction as viewed from the rear, even if the fin 138 of the outer sleeve 106 abuts against the restricting piece 144a, it continues to push the restricting piece 144a in. In this case, the lower stopper 144 does not prohibit the rotation of the outer sleeve 106. On the other hand, when the screw shaft 102 rotates in a right-handed direction as viewed from the rear, the fin 138 of the outer sleeve 106 abuts against the restricting piece 144a, and the lower stopper 144 prohibits the rotation of the outer sleeve 106.

[0072] Next, the operation of the rebar binding machine 2 shown in Fig. 1 will be described. The rebar binding machine 2 performs a binding operation when an operator operates the trigger 12. When the rebar binding machine 2 performs a binding operation, it executes a feeding process, a leading end holding process, a pulling back process, an end end holding process, a cutting process, a twisting process, and a returning process.

[0073] (Sending process) When the feed motor 50 shown in FIG. 4 rotates forward (i.e., rotates in direction D1 shown in FIG. 4) from the initial state of the rebar binding machine 2, the feed unit 38 feeds out a predetermined length of the wire W from the reel 33. The tip of the wire W passes through the fixed cutter member 72, the movable cutter member 74, the left wire passage 134, the guide unit 40, and the right wire passage 132 in that order. This causes the wire W to be wound in a circular shape around the rebar R. When feeding out of the wire W is complete, the feed motor 50 stops.

[0074] (Tip holding process) After the feeding process is completed, when the torsion motor 86 shown in Figure 10 rotates forward, the screw shaft 102 rotates in the left-hand screw direction. At this time, the outer sleeve 106 is prohibited from rotating in the left-hand screw direction by the rotation limiter 92. As a result, the outer sleeve 106, together with the inner sleeve 104, advances relative to the clamp shaft 110, the right clamp 112 becomes fully closed, and the left clamp 114 becomes half-open. As a result, the tip of the wire W is held by the right clamp 112 and the clamp shaft 110. When it is detected that the tip of the wire W is held, the torsion motor 86 stops.

[0075] (Pullback process) After the tip holding step is completed, when the feed motor 50 shown in FIG. 4 rotates in the reverse direction (i.e., rotates in the direction D2 shown in FIG. 4), the feed unit 38 pulls back the wire W wound around the reinforcing bar R. Because the tip of the wire W is held by the right clamp 112 and the clamp shaft 110, the diameter of the wire W around the reinforcing bar R decreases. When the pulling back of the wire W is completed, the feed motor 50 stops.

[0076] (Terminal holding process) After the retraction process is completed, when the torsion motor 86 shown in Figure 10 rotates forward, the screw shaft 102 rotates in the left-handed direction. At this time, the outer sleeve 106 is prohibited from rotating in the left-handed direction by the rotation limiter 92. As a result, the outer sleeve 106, together with the inner sleeve 104, advances relative to the clamp shaft 110, and the left clamp 114 enters a fully closed state. As a result, the end of the wire W is held by the left clamp 114 and the clamp shaft 110.

[0077] (cutting process) After the end-end holding step is completed, when the torsion motor 86 shown in FIG. 10 further rotates forward, the screw shaft 102 rotates in the left-hand thread direction. At this time, the outer sleeve 106 is prohibited from rotating in the left-hand thread direction by the rotation limiter 92. Therefore, the outer sleeve 106, together with the inner sleeve 104, further advances relative to the clamp shaft 110, and as shown in FIG. 8, the push plate 108 pushes the upper end of the second lever member 78 forward. This causes the wire W to be cut by the fixed cutter member 72 and the movable cutter member 74. When cutting of the wire W is complete, the torsion motor 86 stops.

[0078] (Twisting process) After the cutting process is completed, when the twisting motor 86 shown in Figure 10 rotates further in the forward direction, the screw shaft 102 rotates in the left-handed direction. At this time, the outer sleeve 106 is permitted to rotate in the left-handed direction by the rotation limiting portion 92. Therefore, the outer sleeve 106, inner sleeve 104, clamp shaft 110, right clamp 112, and left clamp 114 rotate together in the left-handed direction. This twists the wire W wound around the rebar R. When twisting of the wire W is complete, the twisting motor 86 stops.

[0079] (Return process) After the twisting process is completed, when the torsion motor 86 shown in FIG. 10 rotates in the reverse direction, the screw shaft 102 rotates in the right-hand direction. At this time, the outer sleeve 106 is prohibited from rotating in the right-hand direction by the rotation limiter 92. Therefore, the outer sleeve 106, together with the inner sleeve 104, moves backward relative to the clamp shaft 110. The left clamp 114 moves through a half-open state and then to a fully open state, and the right clamp 112 moves to a fully open state. Thereafter, when the rotation limiter 92 permits rotation in the right-hand direction, the outer sleeve 106, inner sleeve 104, clamp shaft 110, right clamp 112, and left clamp 114 rotate together in the right-hand direction. When the long fin 138b abuts against the lower stopper 144, rotation of the outer sleeve 106 is again prohibited, and the outer sleeve 106, together with the inner sleeve 104, moves backward again relative to the clamp shaft 110. When it is detected that the torsion unit 46 has returned to its initial state, the torsion motor 86 is stopped.

[0080] In the reinforcing bar binding machine 2, wire W of various thicknesses is selected depending on the diameter of the reinforcing bar R to be used. Furthermore, wire W covered with a coating (for example, a resin material) or plated wire W is selected depending on the environment in which the reinforcing bar R will be used. The types of reels 33 (see FIG. 18) are distinguished depending on the thickness of the wire W, whether it is covered or not, and whether it is plated or not. For this reason, the reinforcing bar binding machine 2 is equipped with a type detection mechanism 158 (see FIG. 18) for detecting the type of reel 33.

[0081] First, the reel 33 will be described. As shown in Fig. 18, the reel 33 is disposed in the accommodation space 26b of the reel holder 10. The reel 33 is supported by the reel holder 10 so as to be rotatable around a rotation axis AX extending in the left-right direction. The reel 33 includes a bobbin 160 and a wire W. The central axis of the bobbin 160 is aligned with the rotation axis AX of the reel 33.

[0082] 19, the bobbin 160 includes a body portion 162, a pair of flanges 164, 166, and a plurality of (six in this embodiment) protrusions 168. Hereinafter, the pair of flanges 164, 166 may be referred to as the left flange 164 and the right flange 166, respectively. The body portion 162, the pair of flanges 164, 166, and the six protrusions 168 are made of, for example, a resin material. The body portion 162, the pair of flanges 164, 166, and the six protrusions 168 are integrally formed.

[0083] The body portion 162 includes an outer cylindrical portion 170, an inner cylindrical portion 172, and a connecting portion 174. The outer cylindrical portion 170 and the inner cylindrical portion 172 have a substantially cylindrical shape. A wire W (see FIG. 18) is wound in multiple layers around the outer peripheral surface of the outer cylindrical portion 170. The inner cylindrical portion 172 is disposed inside the outer cylindrical portion 170. As shown in FIG. 18, an engagement groove 172a is formed at the right end of the inner peripheral surface of the inner cylindrical portion 172. A bearing groove 172b is formed at the left end of the inner peripheral surface of the inner cylindrical portion 172. The connecting portion 174 is disposed between the inner peripheral surface of the outer cylindrical portion 170 and the outer peripheral surface of the inner cylindrical portion 172. The connecting portion 174 connects the outer cylindrical portion 170 and the inner cylindrical portion 172.

[0084] As shown in Figure 19, the left flange 164 and the right flange 166 have a wide, circular disk shape. The wire W (see Figure 18) is disposed between the left flange 164 and the right flange 166. The left flange 164 is disposed at the left end of the body 162. The left flange 164 extends radially outward from the outer peripheral surface of the outer tubular portion 170. The left flange 164 has a locking groove 176 that penetrates the left flange 164 in the thickness direction (left-right direction). The locking groove 176 includes a guide portion 176a extending from the inner peripheral surface to the outer peripheral surface of the left flange 164, a start end locking portion 176b connected to the guide portion 176a near the inner peripheral surface of the left flange 164, and a terminal end locking portion 176c connected to the guide portion 176a near the outer peripheral surface of the left flange 164. One end of the wire W wound around the outer tubular portion 170 is locked to the left flange 164 by the start end locking portion 176b. The other end of the wire W wound around the outer tubular portion 170 is locked to the left flange 164 by the terminal end locking portion 176c.

[0085] The right flange 166 is disposed at the right end of the body 162. The right flange 166 extends radially outward from the outer peripheral surface of the outer tubular portion 170. The diameter of the outer peripheral surface of the right flange 166 is smaller than the diameter of the outer peripheral surface of the left flange 164.

[0086] The six protrusions 168 extend from between the inner peripheral surface of the outer cylindrical portion 170 and the outer peripheral surface of the inner cylindrical portion 172 along the rotation axis AX of the reel 33, outward (to the right) from the outer surface (right surface) of the right flange portion 166. The protrusions 168 have a generally semi-cylindrical shape obtained by dividing a cylinder in half. The six protrusions 168 are arranged at equal intervals around the rotation axis AX of the reel 33 (along the rotation direction of the reel 33). In this embodiment, adjacent protrusions 168 are arranged at intervals corresponding to an angle of 60 degrees around the rotation axis AX of the reel 33.

[0087] The six protrusions 168 include three short protrusions 180 and three long protrusions 182. The longitudinal length of the long protrusions 182 is longer than the longitudinal length of the short protrusions 180. The long protrusions 182 extend farther from the outer surface (right surface) of the right flange 166 than the short protrusions 180. Using one of the six protrusions 168 (hereinafter referred to as reference protrusion 168a) as a reference, the three short protrusions 180 are disposed at 0 degrees, 120 degrees, and 180 degrees in the rotational direction of the reel 33. Furthermore, using reference protrusion 168a as a reference, the three long protrusions 182 are disposed at 60 degrees, 240 degrees, and 300 degrees in the rotational direction of the reel 33.

[0088] The number of short protrusions 180, the number of long protrusions 182, and the arrangement of the short protrusions 180 and long protrusions 182 vary depending on the type of reel 33. For example, in another type of reel 33, the six protrusions 168 include two short protrusions 180 and four long protrusions 182. Using the reference protrusion 168a as a reference, the two short protrusions 180 are arranged at 0 degree and 180 degree positions, and the four long protrusions 182 are arranged at 60 degree, 120 degree, 240 degree, and 300 degree positions.

[0089] 18, the reel holder 10 further includes a reel attachment portion 186 for rotatably attaching the reel 33 to the reel holder 10. The reel attachment portion 186 includes a left reel attachment portion 188 and a right reel attachment portion 190.

[0090] The left reel attachment portion 188 is attached to the main cover 28. The left reel attachment portion 188 includes a stopper 192, a cap 194, and a compression spring 196. The stopper 192 has a cylindrical shape with a bottom wall 192a at its right end. An insertion opening 28a is formed in the main cover 28, and the stopper 192 is inserted into the insertion opening 28a from the left side of the main cover 28. The stopper 192 includes a flange 192b located at its left end. The flange 192b can abut against the main cover 28 from the left side. This prevents the stopper 192 from slipping out of the insertion opening 28a from left to right. The cap 194 is fixed to the left surface of the main cover 28. The cap 194 prevents the stopper 192 from slipping out of the insertion opening 28a from right to left. One end of the compression spring 196 is fixed to the cap 194, and the other end of the compression spring 196 abuts against the bottom wall 192a of the stopper 192. When the main cover 28 is closed relative to the holder housing 26 and the reel 33 is disposed in the accommodation space 26b, the compression spring 196 urges the stopper 192 toward the bearing groove 172b of the inner cylindrical portion 172 of the bobbin 160. The stopper 192 is received in the bearing groove 172b and slidably supports the inner cylindrical portion 172.

[0091] The right reel attachment portion 190 includes a turntable 198 , bearings 200 and 202 , and a ring member 204 .

[0092] An insertion opening 26d is formed on the right surface of the holder housing 26, and the turntable 198 is inserted into the insertion opening 26d. The turntable 198 is disposed within the insertion opening 26d with a gap between it and the holder housing 26. The turntable 198 is rotatable around a rotation axis extending in the left-right direction. The rotation axis of the turntable 198 is the same as the rotation axis AX of the reel 33. The turntable 198 includes a turntable main body 206, an engagement member 208, and a shaft member 210. The turntable main body 206 has a generally circular plate shape. As shown in FIG. 20 , the turntable main body 206 includes multiple receiving portions 206a (six in this embodiment). The number of receiving portions 206a is equal to the number of protrusions 168. The receiving portions 206a have a circular cross-sectional shape. The receiving portions 206a penetrate the turntable main body 206 in the thickness direction. The six receiving portions 206a are arranged at equal intervals around the rotation axis AX of the reel 33 (along the rotation direction of the reel 33). In this embodiment, adjacent receiving portions 206a are arranged at intervals corresponding to an angle of 60 degrees around the rotation axis AX of the reel 33.

[0093] The engaging member 208 has a generally cylindrical shape. The engaging member 208 extends leftward from the left surface of the turntable main body 206. The engaging member 208 has an engaging wall 208a formed on its outer circumferential surface. As shown in FIG. 18 , when the reel 33 is placed in the accommodation space 26b, the engaging member 208 is inserted into the inner cylindrical portion 172 of the bobbin 160 from the right side. At this time, the engaging wall 208a (see FIG. 20 ) engages with the engaging groove 172a of the inner cylindrical portion 172. This secures the reel 33 to the turntable 198.

[0094] The shaft member 210 extends rightward from the right surface of the turntable main body 206. The shaft member 210 has a generally cylindrical shape.

[0095] The ring member 204 is disposed in the auxiliary space 30a. The ring member 204 circumferentially surrounds the outer circumferential surface of the shaft member 210. The ring member 204 rotatably supports the shaft member 210 via bearings 200 and 202. As shown in FIG. 21 , the ring member 204 has two screw holes 204a. The ring member 204 is fixed to the auxiliary cover 30 (see FIG. 18 ) by screws (not shown) threading into the screw holes 204a. Therefore, the turntable 198 is rotatably supported by the auxiliary cover 30 via the ring member 204 and the bearings 200 and 202.

[0096] Next, the type detection mechanism 158 will be described. As shown in Fig. 21, the type detection mechanism 158 includes a type detection unit 216 and a rotation detection unit 218. The type detection unit 216 includes a type detection device 220 and a plurality of (two in this embodiment) type detection magnetic sensors 222 (see Fig. 25).

[0097] 22, the type detection device 220 is fixed to the turntable 198. The type detection device 220 includes a cover member 226, a plurality of (six in this embodiment) support members 228, a plurality of (six in this embodiment) movable members 230, a plurality of (six in this embodiment) type detection magnets 232, and a plurality of (six in this embodiment) compression springs 234.

[0098] As shown in FIG. 23 , the cover member 226 includes a base member 238 and a plurality of (six in this embodiment) clamping members 240. The base member 238 has a disk shape with an opening in the center. The central axis of the base member 238 is aligned with the rotation axis AX of the reel 33. The six clamping members 240 extend leftward from the left surface of the base member 238. Each clamping member 240 includes a pair of opposing clamping walls 240a, 240b. The six clamping members 240 are arranged at equal intervals around the rotation axis AX of the reel 33 (along the rotation direction of the reel 33). In this embodiment, adjacent clamping members 240 are arranged at intervals corresponding to an angle of 60 degrees around the rotation axis AX of the reel 33.

[0099] As shown in FIG. 24, the six support members 228 are integrally formed with the turntable 198. The six support members 228 extend rightward from the right surface of the turntable main body 206. The support members 228 are arranged on the periphery of the receiving portion 206a (see FIG. 20) of the turntable main body 206. The support member 228 has a cylindrical shape that is partially interrupted in the circumferential direction. The support member 228 includes a cutout portion 228a that is partially interrupted in the circumferential direction, and an inner protrusion 228b that is arranged opposite the cutout portion 228a. The cutout portion 228a is arranged radially outward of the turntable main body 206 relative to the inner protrusion 228b. The six support members 228 are arranged to surround the ring member 204. The six support members 228 are arranged at equal intervals around the rotation axis AX of the reel 33 (along the rotation direction of the reel 33). In this embodiment, adjacent support members 228 are arranged at intervals corresponding to an angle of 60 degrees around the rotation axis AX of the reel 33 .

[0100] The movable member 230 shown in FIG. 23 is supported by a support member 228 so as to be slidable in the left-right direction. The movable member 230 is disposed inside the support member 228. The movable member 230 has a generally cylindrical shape with a bottom wall 230a at its left end. The movable member 230 has a receiving groove 230b and a fixing groove 230c that extend from its right end toward the bottom wall 230a. The receiving groove 230b and the fixing groove 230c are disposed at an interval corresponding to an angle of 180 degrees in the circumferential direction of the outer circumferential surface of the movable member 230. The receiving groove 230b receives the inner protrusion 228b (see FIG. 24) of the support member 228. This prevents the movable member 230 from rotating. A type detection magnet 232 is fitted into the fixing groove 230c. This fixes the type detection magnet 232 to the movable member 230.

[0101] The compression spring 234 is disposed between the pair of sandwiching walls 240a, 240b of the sandwiching member 240. One end of the compression spring 234 abuts against the base member 238, and the other end of the compression spring 234 abuts against the bottom wall 230a of the movable member 230. The compression spring 234 biases the movable member 230 in a direction away from the base member 238 toward the initial position. This allows the movable member 230 to slide between the initial position and a specific position. Here, the initial position is the position of the movable member 230 when the reel 33 is not attached to the reel holder 10.

[0102] 25, each of the type detection magnetic sensors 222 is fixed to a sensor board 244. The sensor board 244 faces the type detection device 220. The type detection magnetic sensors 222 are electrically connected to the control circuit board 36 (see FIG. 3) by wiring not shown.

[0103] The rotation detection unit 218 includes a plurality of (two in this embodiment) rotation detection magnetic sensors 248. Each of the rotation detection magnetic sensors 248 is fixed to the sensor substrate 244. The rotation detection magnetic sensors 248 are arranged side by side with the type detection magnetic sensors 222 in the direction along the rotation axis AX of the reel 33. Hereinafter, the sensor substrate 244, the type detection magnetic sensors 222, and the rotation detection magnetic sensors 248 may be collectively referred to as a detection unit 250. In this embodiment, the type detection mechanism 158 includes a plurality of (two) detection units 250. Hereinafter, one of the detection units 250 (for example, the front detection unit 250 in FIG. 25) may be referred to as detection unit 250a, and the other detection unit 250 (for example, the rear detection unit 250 in FIG. 25) may be referred to as detection unit 250b.

[0104] 26, the two type detection magnetic sensors 222 are arranged at equal intervals along the rotation direction of the reel 33 (around the rotation axis AX of the reel 33). In this embodiment, the two type detection magnetic sensors 222 are arranged at an interval corresponding to an angle of 180 degrees (360 degrees / 2 sensors) along the rotation direction of the reel 33. The two rotation detection magnetic sensors 248 are also arranged at equal intervals along the rotation direction of the reel 33. In this embodiment, the two rotation detection magnetic sensors 248 are arranged at an interval corresponding to an angle of 180 degrees (360 degrees / 2 sensors) along the rotation direction of the reel 33.

[0105] Next, a method for detecting the type of reel 33 will be described. First, with the main cover 28 (see FIG. 18) of the reel holder 10 open, the protrusions 168 (see FIG. 27) of the reel 33 are inserted into the receiving portions 206a (see FIG. 27) of the turntable 198. This causes the protrusions 168 to engage with the receiving portions 206a. Next, the main cover 28 is closed, and the lock lever 32 (see FIG. 1) is rotated to hold the main cover 28 in a closed state. This causes the engagement wall 208a (see FIG. 20) of the engagement member 208 of the turntable 198 to engage with the engagement groove 172a, and the stopper 192 to be received in the bearing groove 172b of the reel 33, as shown in FIG. 18. The reel 33 is attached to the reel attachment portion 186 so as to be rotatable relative to the holder housing 26.

[0106] As shown in FIG. 27 , when the reel 33 is attached to the reel attachment portion 186, the three long protrusions 182 press the corresponding movable member 230 to push it from the initial position to the attached position. The attached position is located closer to the base member 238 of the cover member 226 than the initial position in the direction along the rotation axis AX of the reel 33. The attached position may vary depending on the type of reel 33. When the movable member 230 is pushed to the attached position, the type detection magnet 232 is also pushed in. When the movable member 230 is located at the attached position, the type detection magnet 232 is positioned to face the rotation detection magnetic sensor 248 when the reel 33 rotates (see the front movable member 230 in FIG. 27 ). On the other hand, the three short protrusions 180 do not come into contact with the corresponding movable member 230 even when the reel 33 is attached to the reel attachment portion 186 because the length of the short protrusions 180 is shorter than the length of the long protrusions 182. These movable members 230 are not pushed in by the short protrusions 180, and are placed in their initial positions by the biasing force of the compression springs 234. When the movable members 230 are placed in their initial positions, the type detection magnets 232 are positioned to face the type detection magnetic sensors 222 when the reels 33 rotate (see the rear movable member 230 in Figure 27).

[0107] Next, the control circuit board 36 (see FIG. 3) executes a type detection process to detect the type of the reel 33. The control circuit board 36 executes the type detection process when it detects that the main cover 28 is closed via a closed state detection switch (not shown) attached to the holder housing 26. The type detection process is executed, for example, when a reel 33 is attached to the reel holder 10 in a newly purchased rebar binding machine 2, or when a new reel 33 is attached to the reel holder 10 to replace a used reel 33. The type detection process is different from the binding operation of binding rebar R using wire W.

[0108] First, when the control circuit board 36 rotates the feed motor 50 (see FIG. 4) in the forward direction (direction D1 shown in FIG. 4), the reel 33 rotates. As the reel 33 rotates, the type detection device 220 rotates integrally with the turntable 198. At this time, when the movable member 230 arranged in the initial position passes a position facing the type detection magnetic sensor 222, the type detection magnetic sensor 222 detects, for example, a magnetic fluctuation and detects the type detection magnet 232. The control circuit board 36 detects that the type detection magnet 232 has been detected. Furthermore, when the movable member 230 arranged in the mounting position passes a position facing the rotation detection magnetic sensor 248, the rotation detection magnetic sensor 248 detects, for example, a magnetic fluctuation and detects the type detection magnet 232. The control circuit board 36 detects that the type detection magnet 232 has been detected. As the reel 33 rotates, the control circuit board 36 detects the signal chart shown in FIG. 28. 28, the signal chart represented by the top solid line is a signal chart related to the detection of type detection magnetic sensor 222 of detection unit 250a, the signal chart represented by the second solid line from the top is a signal chart related to the detection of rotation detection magnetic sensor 248 of detection unit 250a, the signal chart represented by the third solid line from the top is a signal chart related to the detection of type detection magnetic sensor 222 of detection unit 250b, and the signal chart represented by the fourth (lowest) solid line from the top is a signal chart related to the detection of rotation detection magnetic sensor 248 of detection unit 250b. In the example of FIG. 28, when type detection magnetic sensor 222 detects type detection magnet 232 and when rotation detection magnetic sensor 248 detects type detection magnet 232, the signal strength is "1", and when type detection magnetic sensor 222 does not detect type detection magnet 232 and when rotation detection magnetic sensor 248 does not detect type detection magnet 232, the signal strength is "0".

[0109] When the signal strength of the four signal charts reaches "1" six times after the first time it is detected, the control circuit board 36 determines that the reel 33 has made one-half rotation and stops the feed motor 50. When the control circuit board 36 determines that the number of rotations of the feed motor 50 is below a predetermined number (e.g., 0), it determines that the feed motor 50 has stopped. When the signal strength reaches "1" six times after the first time it is detected, this indicates that all of the type-detecting magnets 232 have been detected by either the type-detecting magnetic sensor 222 and rotation-detecting magnetic sensor 248 of the detection unit 250a or the type-detecting magnetic sensor 222 and rotation-detecting magnetic sensor 248 of the detection unit 250b. Next, the control circuit board 36 identifies the shapes of the four signal charts detected within a period T1 in FIG. 28. The period T1 is half the period T2 of the signal charts when the reel 33 makes one rotation. Next, the control circuit board 36 identifies a reference signal chart that matches the shapes of the identified four signal charts. Because the movable member 230 that is pushed to the attachment position differs depending on the type of reel 33, the shape of the reference signal chart differs depending on the type of reel 33. The control circuit board 36 stores multiple reference signal charts corresponding to the types of reel 33. The control circuit board 36 identifies the type of reel 33 from the identified reference signal chart. Next, the control circuit board 36 sets conditions for binding the wire W to the rebar R in the rebar binding machine 2 according to the identified type of reel 33. Finally, the control circuit board 36 rotates the feed motor 50 in the reverse direction (in the direction D2 shown in FIG. 4) to pull the wire W back toward the reel 33.

[0110] (effect) The reinforcing bar binding machine 2 includes a bobbin 160 having a long protrusion 182, a reel 33 having a wire W wound around the bobbin 160, a reel attachment portion 186 for rotatably attaching the reel 33, a feeding portion 38 that feeds out the wire W wound around the bobbin 160 around the reinforcing bar R, a twisting portion 46 that twists the wire W around the reinforcing bar R, a plurality of detecting portions 250 that detect the long protrusion 182, the reel attachment portion 186, the feeding portion 38, the twisting portion 46, and a support portion 15 that supports the plurality of detecting portions 250. The plurality of detecting portions 250 are arranged along the rotation direction of the reel 33, and detect the long protrusion 182 while the reel 33 is rotating.

[0111] According to the above configuration, since the multiple detectors 250 are arranged along the rotation direction of the reel 33, it is possible to detect the long protrusions 182 before one rotation of the reel 33. This makes it possible to detect specific information about the reel 33 before one rotation of the reel 33.

[0112] The rebar binding machine 2 also includes a bobbin 160 having a long protrusion 182, a reel attachment portion 186 for rotatably attaching a reel 33 having a wire W wound around the bobbin 160, a feeding portion 38 that feeds out the wire W wound around the bobbin 160 around the rebar R, a twisting portion 46 that twists the wire W around the rebar R, a plurality of detecting portions 250 that detect the long protrusion 182, the reel attachment portion 186, the feeding portion 38, the twisting portion 46, and a support portion 15 that supports the plurality of detecting portions 250. The plurality of detecting portions 250 are arranged along the rotation direction of the reel 33, and detect the long protrusion 182 while the reel 33 is rotating.

[0113] According to the above configuration, the same effects as those of the reinforcing bar binding machine 2 described above can be achieved.

[0114] The reel 33 disclosed in this specification is used by being rotatably attached to a reel attachment portion 186 of a reinforcing bar binding machine 2. The reel 33 includes a bobbin 160 having a long protrusion 182, and a wire W wound around the bobbin 160. The reinforcing bar binding machine 2 includes multiple detectors 250 arranged along the rotation direction of the reel 33. The long protrusion 182 holds type information indicating the type of reel 33. The long protrusion 182 is detected by the multiple detectors 250 while the reel 33 is rotating.

[0115] According to the above configuration, the multiple detectors 250 are arranged along the rotation direction of the reel 33, so when the reel 33 is attached to the reel attachment portion 186 of the reinforcing bar binding machine 2, the long protrusion 182 is detected before the reel 33 makes one rotation. This makes it possible for the reinforcing bar binding machine 2 to detect specific information about the reel 33 before the reel 33 makes one rotation.

[0116] The reel attachment portion 186 also includes a turntable 198 that is rotatably supported by the support portion 15. When the reel 33 is attached to the reel attachment portion 186, the bobbin 160 is fixed to the turntable 198.

[0117] According to the above configuration, since the turntable 198 is supported by the support part 15, it is not necessary to attach or detach the turntable 198 to or from the support part 15. This makes it possible to prevent the position of the rotation axis of the turntable 198 from shifting. This makes it possible to prevent the position of the rotation axis AX of the reel 33 from shifting.

[0118] The rebar binding machine 2 also includes a movable member 230 movably supported on the turntable 198. When the reel 33 is not attached to the reel attachment portion 186, the movable member 230 is disposed in an initial position. When the reel 33 is attached to the reel attachment portion 186, the long protrusion 182 presses the movable member 230 toward the attachment position. Each of the multiple detection units 250 detects the long protrusion 182 by detecting the movable member 230 in the attachment position.

[0119] According to the above configuration, the specific information of the reel 33 can be detected before the reel 33 makes one rotation by using a simple configuration for detecting the position of the movable member 230.

[0120] The rebar binding machine 2 further includes a type detection magnet 232 fixed to the movable member 230. Each of the multiple detection units 250 includes a type detection magnetic sensor 222 that can detect whether the movable member 230 is in the attachment position by detecting the type detection magnet 232.

[0121] When an optical sensor, such as a photointerrupter, is used, detection sensitivity decreases when dirt due to foreign matter or the like adheres to the photointerrupter or when disturbance light is irradiated onto the photointerrupter. With the above configuration, the type-detecting magnetic sensor 222 detects, for example, fluctuations in magnetism caused by the type-detecting magnet 232, and detects whether the movable member 230 is in the attached position. Compared to when a photointerrupter is used, it is possible to detect whether the movable member 230 is in the attached position without being affected by dirt due to foreign matter or disturbance light.

[0122] The rebar binding machine 2 further includes a compression spring 234 that biases the movable member 230 toward the initial position when the reel 33 is removed from the reel attachment portion 186.

[0123] According to the above configuration, when the reel 33 is removed from the reel attachment portion 186, the movable member 230 can be returned to the initial position.

[0124] The bobbin 160 further includes a body 162 around which the wire W is wound, and a flange 166 disposed at one end of the body 162. The long protrusion 182 protrudes outward from the outer surface of the flange 166 along the rotation axis AX of the reel 33. The turntable 198 includes a receiving portion 206a that receives and engages with the long protrusion 182.

[0125] According to the above configuration, the reel 33 can be fixed to the turntable 198 with a simple configuration.

[0126] Each of the plurality of detection sections 250 includes a rotation detection unit 218 that detects the rotation angle of the reel 33 .

[0127] According to the above configuration, the detection unit 250 can be used to detect not only the type of the reel 33 but also the rotation of the reel 33.

[0128] The rebar binding machine 2 may also include a type detection magnet 232 that rotates integrally with the reel 33. The rotation detection unit 218 includes a rotation detection magnetic sensor 248 that detects the type detection magnet 232 to detect the rotation angle of the reel 33.

[0129] When an optical sensor, such as a photointerrupter, is used, detection sensitivity decreases when the photointerrupter is contaminated with foreign matter or exposed to external light. With the above configuration, the rotation detection magnetic sensor 248 detects, for example, fluctuations in magnetism caused by the type detection magnet 232 to detect the rotation angle of the reel 33. Compared to when a photointerrupter is used, the rotation angle of the reel 33 can be detected without being affected by contaminants or external light.

[0130] Furthermore, the plurality of detectors 250 are fixed to the support 15 .

[0131] According to the above configuration, the positions of the plurality of detecting portions 250 do not change even when the reel 33 rotates. The plurality of detecting portions 250 enable the long protrusion 182 to be detected more accurately.

[0132] The plurality of detecting sections 250 includes two detecting sections 250. Adjacent detecting sections 250 are arranged at an interval corresponding to an angle of 180 degrees (360 degrees / 2) along the rotation direction.

[0133] According to the above configuration, specific information on the reel 33 can be detected by rotating the reel 33 through an angle of 180 degrees (360 degrees / 2).

[0134] (Correspondence) The long protrusion 182 is an example of a "detectable portion" and a "protrusion." The compression spring 234 is an example of a "biasing member." The rotation detection unit 218 is an example of a "rotation detection portion." The type detection magnet 232 is an example of a "rotation detection magnet."

[0135] (Second Example) A second embodiment will be described with reference to the drawings. In the second embodiment, only the differences from the first embodiment will be described, and the same reference numerals will be used to designate the same parts as in the first embodiment, and a description thereof will be omitted. As shown in FIG. 29, in the second embodiment, the two type-detecting magnetic sensors 222 are not arranged at equal intervals along the rotation direction of the reel 33 (see FIG. 18) (around the rotation axis AX of the reel 33), and the two rotation-detecting magnetic sensors 248 are also not arranged at equal intervals along the rotation direction of the reel 33.

[0136] The two type detection magnetic sensors 222 are arranged at an interval corresponding to an angle of 240 degrees along the rotation direction of the reel 33. The two type detection magnetic sensors 222 are also arranged at an interval corresponding to an angle of 120 degrees along the direction opposite to the rotation direction of the reel 33. The two rotation detection magnetic sensors 248 are also arranged at an interval corresponding to an angle of 120 degrees along the rotation direction of the reel 33. The two rotation detection magnetic sensors 248 are also arranged at an interval corresponding to an angle of 240 degrees along the direction opposite to the rotation direction of the reel 33.

[0137] Next, a method for detecting the type of the reel 33 will be described. Only the type detection process will be described below. When the signal strength reaches "1" eight times after the first time it is detected in the four signal charts shown in FIG. 30, the control circuit board 36 determines that the reel 33 has made two-thirds of a turn and stops the feed motor 50 (see FIG. 4). When the control circuit board 36 determines that the number of rotations of the feed motor 50 is less than a predetermined number (e.g., 0), it determines that the feed motor 50 has stopped. When the signal strength reaches "1" eight times after the first time it is detected, this indicates that all of the type-detecting magnets 232 have been detected by either the type-detecting magnetic sensor 222 and rotation-detecting magnetic sensor 248 of the detection unit 250a or the type-detecting magnetic sensor 222 and rotation-detecting magnetic sensor 248 of the detection unit 250b. Next, the control circuit board 36 identifies the shapes of the four signal charts detected within the period T3 shown in FIG. 30. The period T3 is 2 / 3 of the period T2 of the signal chart when the reel 33 makes one rotation. Next, the control circuit board 36 identifies a reference signal chart that matches the shape of the identified four signal charts. Because the movable member 230 that is pushed to the attachment position differs depending on the type of reel 33, the shape of the reference signal chart differs depending on the type of reel 33. The control circuit board 36 stores multiple reference signal charts corresponding to the type of reel 33. The control circuit board 36 identifies the type of reel 33 from the identified reference signal chart. Next, the control circuit board 36 sets conditions for binding the wire W to the rebar R in the rebar binding machine 2 according to the identified type of reel 33. Finally, the control circuit board 36 rotates the feed motor 50 in the reverse direction (in the direction D2 shown in FIG. 4) to pull the wire W back toward the reel 33.

[0138] (effect) Furthermore, the plurality of detecting units 250 includes two detecting units 250. The maximum value of the interval between adjacent detecting units 250 may be an interval corresponding to a specific angle (240 degrees) greater than 180 degrees (360 degrees / 2) along the rotation direction.

[0139] According to the above configuration, specific information on the reel 33 can be detected by the reel 33 rotating by a specific angle (240 degrees) that is smaller than 360 degrees.

[0140] (Third Example) A third embodiment will be described with reference to the drawings. In the third embodiment, only the differences from the first embodiment will be described, and the same components as those in the first embodiment will be denoted by the same reference numerals and will not be described again. As shown in FIG. 31 , in the third embodiment, the type detection mechanism 158 includes three detection units 250. The three type detection magnetic sensors 222 are arranged at equal intervals along the rotation direction of the reel 33 (see FIG. 18 ) (around the rotation axis AX of the reel 33). In this embodiment, the three type detection magnetic sensors 222 are arranged at intervals corresponding to an angle of 120 degrees (360 degrees / 3 sensors) along the rotation direction of the reel 33. The three rotation detection magnetic sensors 248 are also arranged at equal intervals along the rotation direction of the reel 33. In this embodiment, the three rotation detection magnetic sensors 248 are arranged at intervals corresponding to an angle of 120 degrees (360 degrees / 3 sensors) along the rotation direction of the reel 33.

[0141] In the third embodiment, when the reel 33 rotates one-third of the way, all of the type-detecting magnets 232 (see FIG. 27) are detected by either the type-detecting magnetic sensor 222 or the rotation-detecting magnetic sensor 248. When the control circuit board 36 (see FIG. 3) determines that the reel 33 has rotated one-third of the way, it identifies the type of the reel 33 using the shape of the signal chart.

[0142] (Variation) In one embodiment, the rotation detection unit 218 may further include a plurality of rotation detection magnets. The rotation detection magnets may be fixed to the cover member 226 of the type detection device 220. In this case, the rotation detection magnetic sensor 248 may be disposed in a position facing the rotation detection magnets when the reel 33 rotates.

[0143] In one embodiment, the number of protrusions 168 is not limited to six and may be any number. Furthermore, the number of short protrusions 180 and the number of long protrusions 182 are also not limited to three and may be any number.

[0144] In one embodiment, the plurality of protrusions 168 may not be arranged at equal intervals around the rotation axis AX of the reel 33.

[0145] In one embodiment, the number of detectors 250 is not limited to two or three, but may be four or more. [Explanation of symbols]

[0146] 2: Rebar binding machine 10: Reel holder 15: Support part 26: Holder housing 26b: Containment space 28: Main cover 30: Auxiliary cover 30a: Auxiliary space 33: Reel 36: Control circuit board 38: Feed section 40: Information department 44: Cutting section 46: Twisted section 158: Type detection mechanism 160: Bobbin 162: Torso 164: Left brim 166: Right tsuba 168: Protrusion 180: Short protrusion 182: Long protrusion 186: Reel attachment part 188: Left reel attachment 190: Right reel attachment 198: Turntable 206: Turntable body 206a:Reception Department 216: Type detection unit 218: Rotation detection unit 220: Type detection device 222: Magnetic sensor for type detection 226: Cover member 228: Support member 230: Movable member 232: Type detection magnet 234: Compression spring 244: Sensor board 248: Magnetic sensor for detecting rotation 250:Detection unit AX: Rotation axis B: Battery pack W: Wire

Claims

1. A rebar tying machine, a reel including a bobbin having a detection target portion and a wire wound around the bobbin; a reel attachment portion for rotatably attaching the reel; a feeding unit that feeds the wire wound on the bobbin around a reinforcing bar; a twisting unit that twists the wire around the reinforcing bar; a plurality of detecting units that detect the detected units; the reel attachment portion, the feed portion, the twisting portion, and a support portion that supports the plurality of detection portions, the plurality of detecting portions are arranged along a rotation direction of the reel, and detect the detection target portions while the reel is rotating; the reel attachment portion includes a turntable rotatably supported by the support portion, When the reel is attached to the reel attachment portion, the bobbin is fixed to the turntable, The rebar tying machine further includes a movable member movably supported on the turntable, the detected portion includes a protrusion, When the reel is not attached to the reel attachment portion, the movable member is disposed at an initial position, When the reel is attached to the reel attachment portion, the protrusion presses the movable member toward the attachment position, Each of the plurality of detection units detects the movable member at the mounting position, thereby detecting the detected portion.

2. Further, a type detection magnet is fixed to the movable member, The rebar tying machine according to claim 1, wherein each of the plurality of detection units is equipped with a type detection magnetic sensor capable of detecting whether the movable member is in the mounting position by detecting the type detection magnet.

3. The reinforcing bar binding machine according to claim 1 or 2, further comprising a biasing member that biases the movable member toward the initial position when the reel is removed from the reel attachment portion.

4. The bobbin is a trunk portion around which the wire is wound; a flange portion disposed at one end of the body portion, the protrusion protrudes outward from the outer surface of the flange along the rotation axis of the reel, The reinforcing bar binding machine according to claim 1 , wherein the turntable is provided with a receiving portion that receives and engages with the protrusion.

5. A rebar tying machine, a reel including a bobbin having a detection target portion and a wire wound around the bobbin; a reel attachment portion for rotatably attaching the reel; a feeding unit that feeds the wire wound on the bobbin around a reinforcing bar; a twisting unit that twists the wire around the reinforcing bar; a plurality of detecting units that detect the detected units; the reel attachment portion, the feed portion, the twisting portion, and a support portion that supports the plurality of detection portions, the plurality of detecting portions are arranged along a rotation direction of the reel, and detect the detection target portions while the reel is rotating; each of the plurality of detection units includes a rotation detection unit that detects a rotation angle of the reel; The rebar tying machine further includes a rotation detection magnet that rotates integrally with the reel, The rotation detection unit includes a rotation detection magnetic sensor that detects the rotation angle of the reel by detecting the rotation detection magnet.

6. The reinforcing bar binding machine according to claim 1 , wherein the plurality of detectors are fixed to the support.

7. The plurality of detectors includes N detectors, N is an integer of 2 or more, The reinforcing bar binding machine according to any one of claims 1 to 6, wherein the adjacent detectors are arranged at an interval corresponding to an angle of 360 / N along the rotation direction.

8. The plurality of detectors includes N detectors, N is an integer of 2 or more, The rebar tying machine according to any one of claims 1 to 6, wherein the maximum value of the spacing between adjacent detectors is a spacing corresponding to a specific angle greater than an angle of 360 / N along the rotation direction.

9. A rebar tying machine, a reel attachment portion for rotatably attaching a reel including a bobbin having a detection portion and a wire wound around the bobbin; a feeding unit that feeds the wire wound on the bobbin around a reinforcing bar; a twisting unit that twists the wire around the reinforcing bar; a plurality of detecting units that detect the detected units; the reel attachment portion, the feed portion, the twisting portion, and a support portion that supports the plurality of detection portions, the plurality of detecting portions are arranged along a rotation direction of the reel, and detect the detection target portions while the reel is rotating; the reel attachment portion includes a turntable rotatably supported by the support portion, When the reel is attached to the reel attachment portion, the bobbin is fixed to the turntable, The rebar tying machine further includes a movable member movably supported on the turntable, the detected portion includes a protrusion, When the reel is not attached to the reel attachment portion, the movable member is disposed at an initial position, When the reel is attached to the reel attachment portion, the protrusion presses the movable member toward the attachment position, Each of the plurality of detection units detects the movable member at the mounting position, thereby detecting the detected portion.

10. A rebar tying machine, a reel attachment portion for rotatably attaching a reel including a bobbin having a detection portion and a wire wound around the bobbin; a feeding unit that feeds the wire wound on the bobbin around a reinforcing bar; a twisting unit that twists the wire around the reinforcing bar; a plurality of detecting units that detect the detected units; the reel attachment portion, the feed portion, the twisting portion, and a support portion that supports the plurality of detection portions, the plurality of detecting portions are arranged along a rotation direction of the reel, and detect the detection target portions while the reel is rotating; each of the plurality of detection units includes a rotation detection unit that detects a rotation angle of the reel; The rebar tying machine further includes a rotation detection magnet that rotates integrally with the reel, The rotation detection unit includes a rotation detection magnetic sensor that detects the rotation angle of the reel by detecting the rotation detection magnet.

Images