CN110816929A

CN110816929A - Reinforcing bar binding machine

Info

Publication number: CN110816929A
Application number: CN201910659783.7A
Authority: CN
Inventors: 松野匡辅
Original assignee: Makita Corp
Current assignee: Makita Corp
Priority date: 2018-08-07
Filing date: 2019-07-22
Publication date: 2020-02-21
Anticipated expiration: 2039-07-22
Also published as: US20200047930A1; JP7100528B2; JP2020023831A; CN110816929B; DE102019120637A1

Abstract

The invention provides a technology capable of restraining excessive load applied to an actuator for drawing out a wire from a reel in a reinforcing bar binding machine in which the reel and an axle are integrally rotated. The present specification discloses a reinforcing bar binding machine. The reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; an axle holding portion that holds the axle rotatably; and an elastic body interposed between the wheel shaft and the wheel shaft holding portion. Another rebar tying machine is also disclosed. The reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; and an axle holding portion that holds the axle to be rotatable. The axle may be configured to be movable relative to the axle holder.

Description

Reinforcing bar binding machine

Technical Field

The technology disclosed in this specification relates to a reinforcing bar binding machine.

Background

Patent document 1 discloses a reinforcing bar binding machine. The reinforcing bar binding machine includes a reel having a wire, an axle that holds the reel and is rotatable integrally with the reel, and an axle holding portion that holds the axle so as to be rotatable.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2018-111960

Disclosure of Invention

Problems to be solved by the invention

In the technique of patent document 1, the spool is pressed against the axle to engage the spool with the axle, thereby integrally rotating the spool and the axle. In such a structure, if the spool is pressed against the axle excessively for some reason, the resistance when the spool and the axle are rotated increases. At this time, an excessive load may be applied to the driver that draws the wire from the spool. In the present specification, a technique is provided for smoothly rotating a reel in a reinforcing bar binding machine in which the reel and an axle are integrally rotated. Further, a technique capable of suppressing an excessive load from being applied to an actuator for drawing out a wire from a spool is provided.

Means for solving the problems

The present specification discloses a reinforcing bar binding machine. The reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; an axle holding portion that holds the axle rotatably; and an elastic body interposed between the wheel shaft and the wheel shaft holding portion.

With the above configuration, even when the spool is excessively pressed against the axle for some reason, the elastic body can suppress the excessive pressing force from acting on the spool and the axle. This can suppress an increase in resistance when the drum and the wheel shaft rotate. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

Another rebar tying machine is also disclosed. The reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; and an axle holding portion that holds the axle to be rotatable. The axle may be configured to be movable relative to the axle holder.

With the above configuration, even when the spool is excessively pressed against the axle for some reason, the axle moves relative to the axle holder, and the excessive pressing force is prevented from acting on the spool and the axle. The situation in which the resistance when the drum and the wheel shaft rotate increases can be suppressed. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

Drawings

Fig. 1 is a perspective view of the reinforcing bar binding machine 2 of the embodiment viewed from the upper left rear.

Fig. 2 is a perspective view of the reinforcing bar binding machine 2 of the embodiment viewed from the upper right and rear.

Fig. 3 is a perspective view of the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 according to the embodiment, as viewed from the upper right and rear.

Fig. 4 is a perspective view of the internal structure of the binding machine main body 4 of the reinforcing bar binding machine 2 according to the embodiment as viewed from the front of the upper left.

Fig. 5 is a perspective view of the reel storage chamber 20 of the reinforcing bar binding machine 2 of the embodiment as viewed from the upper left and rear.

Fig. 6 is a sectional view of the storage mechanism 36 of the reinforcing bar binding machine 2 according to the embodiment.

Fig. 7 is a perspective view of the wire reel WR, the rotary table 60, and the magnetic sensor 66 of the reinforcing bar binding machine 2 according to the embodiment as viewed from the upper right to the rear.

Fig. 8 is a perspective view of the wire reel WR of the reinforcing bar binding machine 2 of the embodiment as viewed from the upper right rear.

Fig. 9 is a perspective view of the rotary table 60 of the reinforcing bar binding machine 2 according to the embodiment as viewed from the upper left and rear.

Fig. 10 is a sectional view of the wire reel WR and the rotating table 60 in a state where the engaging projection 60c of the rotating table 60 is caught by the partition wall WRd of the wire reel WR in the reinforcing bar binding machine 2 according to the embodiment.

Fig. 11 is a sectional view of the wire reel WR and the rotating table 60 in a state where the engaging projection 60c of the rotating table 60 is inserted into the opening WRe of the wire reel WR in the reinforcing bar binding machine 2 according to the embodiment.

Fig. 12 is a cross-sectional view of the wire reel WR and the rotating table 60 in a state where the engaging projection 60c of the rotating table 60 is caught by the partition wall WRd of the wire reel WR in the reinforcing bar binding machine 102 of the comparative example.

Fig. 13 is a perspective view of the wire reel WR, the turntable 60, and the optical sensor 90 of the reinforcing bar binding machine 2 according to the modification as viewed from the upper right to the rear.

Description of the reference numerals

2. A reinforcing bar binding machine; 4. a strapping machine main body; 6. a handle; 8. a battery mounting portion; 12. a housing; 14. a left housing; 16. a right housing; 18. a side cover housing; 18a, a cover holding portion; 20. a reel storage chamber; 22. a reel cover; 22a, a mounting portion; 22b, a mounting part; 28. a trigger; 30. a trigger lock; 34. a control substrate; 36. a storage mechanism; 38. a feed mechanism; 40. a brake mechanism; 42. a guide mechanism; 44. a cutting mechanism; 46. a stranding mechanism; 48. a left support mechanism; 50. a right support mechanism; 52. a base member; 54. a cam member; 54a, a cover holding portion; 54b, cam projections; 56. a shaft member; 56a, a roll holding section; 58. a compression spring; 60. a rotating table; 60a, a roll holding part; 60b, a rotation detection unit; 60c, a clamping protrusion; 60d, a magnet; 60e, a reflector plate; 62. an inboard bearing; 64. an outboard bearing; 66. a magnetic sensor; 66a, a Hall IC; 68. a compression spring; 72. a feed motor; 74. a feed roller; 76. a solenoid; 78. a brake member; 80. a stranding motor; 82. hooking; 90. an optical sensor; 90a, a light emitting section; 90b, a light receiving part; 102. provided is a steel bar binding machine.

Detailed Description

In one or more embodiments, a reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; an axle holding portion that holds the axle rotatably; and an elastic body interposed between the wheel shaft and the wheel shaft holding portion.

In one or more embodiments, the spool may include an opening divided by a partition wall. The axle may include a snap projection that enters the opening and abuts the partition wall in the direction in which the spool rotates.

In the structure in which the partition wall of the spool and the engaging projection of the axle abut against each other in the direction in which the spool rotates as described above, the spool and the axle can be reliably rotated integrally. However, in the case of such a configuration, when the spool is attached to the hub, the engagement projection may not enter the opening, but the engagement projection may ride on the partition wall. If the engaging projection rides on the partition wall, the spool is pressed against the axle excessively, as compared with the case where the engaging projection enters the opening. With the above-described configuration, since the elastic body is interposed between the wheel shaft and the wheel shaft holding portion, even when the engaging projection is caught by the partition wall, it is possible to suppress the excessive pressing force from being applied to the spool and the wheel shaft by the elastic body. This can suppress an increase in resistance when the drum and the wheel shaft rotate. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

In one or more embodiments, the resilient body may be a compression spring.

With the above configuration, when the spool is excessively pressed against the axle, it is possible to effectively suppress a situation in which an excessive pressing force acts on the spool and the axle.

In one or more embodiments, the reinforcing bar binding machine may further include a pressing mechanism that presses the reel against the axle.

With the above configuration, even when the spool is excessively pressed against the axle by the pressing mechanism, the excessive pressing force applied to the spool and the axle can be suppressed by the elastic member interposed between the axle and the axle holder. This can suppress an increase in resistance when the drum and the wheel shaft rotate. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

In one or more embodiments, the reinforcing bar binding machine may further include a rotation detecting mechanism that detects rotation of the axle with respect to the axle holder.

When the rotation of the spool is to be detected using the rotation detecting mechanism as described above, it is necessary to reliably rotate the spool and the wheel shaft integrally. However, if the spool is strongly pressed against the axle in order to reliably rotate the spool and the axle integrally, the spool may be excessively pressed against the axle. With the above configuration, even when the spool is excessively pressed against the axle, the elastic body interposed between the axle and the axle holder can suppress the excessive pressing force from acting on the spool and the axle. This can suppress an increase in resistance when the drum and the wheel shaft rotate. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

In one or more embodiments, a reinforcing bar binding machine may include: a spool having a steel wire; an axle that holds the reel and is rotatable integrally with the reel; and an axle holding portion that holds the axle to be rotatable. The axle is configured to be movable relative to the axle holder.

In one or more embodiments, the axle may be movable with respect to the axle holder in a direction along the rotation axis of the drum, or may not be movable in a direction orthogonal to the rotation axis of the drum.

When the rotation axis of the wheel shaft is displaced from the rotation axis of the drum when the wheel shaft is moved relative to the wheel shaft holding portion, resistance when the drum and the wheel shaft are integrally rotated increases, and an excessive load is applied to an actuator that pulls out the wire from the drum. With the above configuration, even when the axle is moved relative to the axle holder, the rotation axis of the axle is not displaced from the rotation axis of the drum, and therefore, an increase in resistance when the drum and the axle are integrally rotated can be suppressed. Further, it is possible to suppress the application of an excessive load to the actuator that draws the wire from the spool.

(examples)

A reinforcing bar binding machine 2 of an embodiment is explained with reference to the drawings. The reinforcing bar binding machine 2 shown in fig. 1 is an electric power tool for binding a plurality of reinforcing bars R with wires W.

As shown in fig. 1 and 2, the reinforcing bar binding machine 2 includes a binding machine body 4, a handle 6 provided at a lower portion of the binding machine body 4 and capable of being gripped by a user, and a battery mounting portion 8 provided at a lower portion of the handle 6. The battery B is detachably mounted on the lower portion of the battery mounting portion 8. The battery B is a slide type battery that can be attached and detached by sliding relative to the battery mounting portion 8. Battery B is, for example, a lithium ion battery that can be charged by a charger not shown. When the battery B is mounted on the battery mounting portion 8, electric power is supplied from the battery B to the reinforcing bar binding machine 2.

The reinforcing bar binding machine 2 includes a housing 12. The housing 12 includes a left housing 14, a right housing 16, and a side cover housing 18. As shown in fig. 1, the left housing 14 is integrally formed with the outer shape of the left half of the power pack attachment portion 8, the outer shape of the left half of the handle 6, and the outer shape of the left half of the power pack attachment portion 4. As shown in fig. 2, a part of the outer shape of the right half of the binding machine body 4, the outer shape of the right half of the handle 6, and the outer shape of the right half of the battery mounting portion 8 are integrally formed in the right case 16. The left housing 14 is fixed with respect to the right housing 16 with a plurality of screws. The side cover case 18 is formed with a part of the outer shape of the right half of the binding machine body 4. The side cover housing 18 is fixed with respect to the right housing 16 with a plurality of screws.

A reel housing chamber 20 is formed behind the binding machine body 4, and the reel housing chamber 20 houses a wire reel WR (see fig. 3 and the like) around which the wire W is wound. The upper side of the roll storage chamber 20 is covered with a roll cover 22. The reel cover 22 is rotatably held by the binding machine body 4 via

annular attachment portions

22a and 22b provided on the left and right sides. The spool cover 20 opens or closes the spool housing chamber 20 by rotating relative to the binding machine body 4 about a rotation axis in the left-right direction.

A trigger 28 and a trigger lock 30 that can be pulled by a user are provided at an upper front portion of the handle 6, and the trigger lock 30 is disposed behind the trigger 28 and can be switched between a state in which the pulling operation of the trigger 28 is permitted and a state in which the pulling operation is prohibited.

As shown in fig. 3 and 4, the binding machine body 4 mainly includes a control board 34, a storage mechanism 36, a feed mechanism 38, a brake mechanism 40, a guide mechanism 42, a cutting mechanism 44, and a twisting mechanism 46. The control board 34 is disposed at a lower portion of the binding machine main body 4.

The storage mechanism 36 is disposed at the rear of the binding machine body 4. The storage mechanism 36 detachably holds the wire reel WR stored in the reel storage chamber 20. The wire reel WR is rotatably supported by the reel housing chamber 20 by the housing mechanism 36.

The feed mechanism 38 is disposed at an upper portion near the center of the binding machine body 4 in the front-rear direction. The feed mechanism 38 rotates the feed roller 74 by driving of the feed motor 72, and feeds the wire W from the wire reel WR of the storage mechanism 36 to the guide mechanism 42 in front of the binding machine body 4. The operation of the feed motor 72 is controlled by the control substrate 34.

The guide mechanism 42 is disposed at the front portion of the binding machine body 4. The guide mechanism 42 guides the wire W fed from the feed mechanism 38 around the plurality of reinforcing bars R in an annular shape (see fig. 1).

The braking mechanism 40 is disposed near the center of the binding machine body 4 in the front-rear direction. The brake mechanism 40 stops the rotation of the wire reel WR in accordance with the timing at which the feed mechanism 38 stops feeding the wire W. Notches WRa are formed at predetermined angular intervals in the wire reel WR, and the brake mechanism 40 stops the rotation of the wire reel WR by engaging the brake member 78 with the notches WRa by driving the solenoid 76. The operation of the solenoid 76 is controlled by the control board 34.

The cutting mechanism 44 is disposed at the front portion of the binding machine body 4. The cutting mechanism 44 cuts the wire W by a cutter (not shown) that rotates in conjunction with the twisting mechanism 46 in a state where the wire W is wound around the plurality of reinforcing bars R.

The twisting mechanism 46 is disposed over the entire range from the front portion of the binding machine body 4 to the intermediate portion in the front-rear direction. The twisting mechanism 46 includes a hook 82 that advances and retracts and rotates in conjunction with the rotation of the twisting motor 80. The twisting mechanism 46 grips and twists the wire W wound around the plurality of reinforcing bars R by the hook 82, thereby bundling the plurality of reinforcing bars R by the wire W. The operation of the twisting motor 80 is controlled by the control board 34.

As shown in fig. 1, when the user clamps the reinforcing bar binding machine 2 to the plurality of reinforcing bars R and pulls the operation trigger 28, the reinforcing bar binding machine 2 performs a series of operations: the wire W is wound around the plurality of reinforcing bars R by the feeding mechanism 38, the braking mechanism 40, and the guide mechanism 42, and the wire W is cut by the cutting mechanism 44 and the twisting mechanism 46, and twisted around the plurality of reinforcing bars R.

The storage mechanism 36 will be described in detail below. As shown in fig. 5 and 6, the storage mechanism 36 includes a left support mechanism 48 provided on the left side of the roll storage chamber 20 and a right support mechanism 50 provided on the right side of the roll storage chamber 20.

As shown in fig. 6, the left support mechanism 48 includes a base member 52, a cam member 54, a shaft member 56, and a compression spring 58. The base member 52 is fixed with respect to the left housing 14 with a plurality of screws. The cam member 54 is disposed so as to penetrate the base member 52, and is slidably held by the base member 52 in the left-right direction. The cam member 54 includes a cylindrical cover holding portion 54a protruding outside the roll storage chamber 20. The cover holding portion 54a holds the mounting portion 22a of the spool cover 22. The mounting portion 22b of the spool cover 22 is slidably held by a cylindrical cover holding portion 18a, and the cover holding portion 18a is formed in the side cover case 18. As shown in fig. 5, a cam protrusion 54b is formed on the outer peripheral surface of the cover holding portion 54 a. A cam protrusion, not shown, is formed on the inner peripheral surface of the attachment portion 22a of the spool cover 22 corresponding to the cam protrusion 54b of the cover holding portion 54 a. As shown in fig. 6, the shaft member 56 includes a cylindrical roll holding portion 56a that protrudes inside the roll housing chamber 20. The shaft member 56 is fixed with respect to the cam member 54 with a plurality of screws. Therefore, the shaft member 56 is integrated with the cam member 54 and is slidable in the left-right direction with respect to the base member 52. The shaft member 56 is biased in the right direction (i.e., inside the roll storage chamber 20) by a compression spring 58 held by the base member 52. At normal times, the cam member 54 and the shaft member 56 move to the right (i.e., inside the roll storage chamber 20) with respect to the base member 52 by the urging force of the compression spring 58. In this state, the spool holding portion 56a enters the bearing groove WRb of the wire spool WR, and the cam protrusion 54b of the cam member 54 presses the cam protrusion of the mounting portion 22a in the direction in which the spool cover 22 is closed, thereby closing the spool cover 22. At this time, since the reel holding portion 56a is in contact with the bearing groove WRb so as to be slidable with respect to the bearing groove WRb, the wire reel WR is held by the reel holding portion 56a so as to be rotatable with respect to the reel holding portion 56 a. In this state, the wire reel WR is pressed in the right direction (i.e., inside the reel housing chamber 20) by the reel holding portion 56 a. When the user opens the spool cover 22 against the biasing force of the compression spring 58 from this state, the cam projection of the mounting portion 22a of the spool cover 22 presses the cam projection 54b of the cover holding portion 54a in the left direction (i.e., outside the spool housing chamber 20) as the spool cover 22 rotates. Thereby, the cam member 54 and the shaft member 56 move to the left side (i.e., the outside of the roll housing chamber 20) with respect to the base member 52, and the roll holding portion 56a is pulled out from the bearing receiving groove WRb of the wire roll WR. In this state, the user can put the wire reel WR into the reel housing chamber 20 or take the wire reel WR out of the reel housing chamber 20.

As shown in fig. 6, the right support mechanism 50 includes a rotary table 60, an inner bearing 62, an outer bearing 64, a magnetic sensor 66 (see fig. 3), and a compression spring 68. The rotary table 60 is rotatably held by the right casing 16 via an inner bearing 62 and an outer bearing 64. The rotary table 60 is slidable in the left-right direction with respect to the inner bearing 62 and the outer bearing 64. The rotary table 60 is biased leftward (i.e., inward of the roll storage chamber 20) by a compression spring 68 held by the outer bearing 64. In a normal state, the turntable 60 is moved to the left side (i.e., the inside of the roll storage chamber 20) with respect to the right housing 16 by the biasing force of the compression spring 68.

The rotary table 60 includes a cylindrical roll holding portion 60a protruding inside the roll housing chamber 20, a disk-shaped rotation detecting portion 60b disposed along the inner surface of the roll housing chamber 20, and a plurality of engaging projections 60c (see fig. 9) protruding inside the roll housing chamber 20 and having a substantially triangular flat plate shape. As shown in fig. 8, the wire reel WR is formed with a bearing groove WRc formed in the vicinity of the rotation axis and a plurality of openings WRe arranged radially outward of the bearing groove WRc and separated in the circumferential direction by a partition wall WRd. The reel holding portion 60a enters the bearing groove WRc of the wire reel WR, and slidably abuts against the bearing groove WRc. Further, the engaging projection 60c enters the opening WRe of the wire reel WR. When the wire reel WR rotates, the rotational table 60 also rotates integrally with the wire reel WR by applying a static friction force from the bearing receiving groove WRc to the reel holding portion 60a and bringing the engaging projection 60c into contact with the partition wall WRd in the circumferential direction. As shown in fig. 7, a plurality of magnets 60d are attached to the rotation detecting unit 60b at predetermined angular intervals. The magnetic sensor 66 includes a hall IC66a that detects magnetism from the magnet 60 d. As shown in fig. 3, the magnetic sensor 66 is disposed outside the right housing 16. The magnetic sensor 66 is electrically connected to the control board 34. When the wire reel WR rotates, the magnet 60d of the rotary table 60 rotates integrally with the wire reel WR, and the magnetism detected by the hall IC66a changes. The control board 34 can detect the rotation of the wire reel WR from the variation in magnetism from the magnet 60d detected by the hall IC66a of the magnetic sensor 66.

As shown in fig. 10, when the wire reel WR is snapped into the storage mechanism 36, the tip end of the engagement projection 60c may not enter the opening WRe but may be caught by the partition wall WRd. In this case, the compression spring 68 is compressed, and the rotary table 60 moves in the right direction (i.e., outside the roll storage chamber 20). In this state, the roll holding portion 60a does not abut on the bearing receiving groove WRc, the engagement projection 60c does not enter the opening WRe, and the tip of the engagement projection 60c abuts on the tip of the partition wall WRd. At this time, the wire reel WR is pressed toward the rotary table 60 of the right support mechanism 50 by the shaft member 56 of the left support mechanism 48, but the compression spring 68 compresses and moves the rotary table 60 in the right direction, so that a large pressing force is not applied to the wire reel WR and the rotary table 60. Therefore, when the feeding mechanism 38 draws the wire W from the wire reel WR by driving the feeding motor 72, the wire reel WR is easily rotated with respect to the rotating table 60. Therefore, the feed mechanism 38 can be brought into the following state as shown in fig. 11 by drawing the wire W from the wire reel WR by driving the feed motor 72: the engagement projection 60c enters the opening WRe, the reel holding portion 60a enters the bearing groove WRc, and the wire reel WR is held as usual.

Fig. 12 shows, as a comparative example, a reinforcing bar binding machine 102 that does not include the compression spring 68 and in which the rotating table 60 cannot slide in the left-right direction with respect to the inner bearing 62 and the outer bearing 64 (i.e., the rotating table 60 cannot move in the left-right direction with respect to the right housing 16). In the reinforcing bar binding machine 102, when the tip end of the engaging projection 60c is not inserted into the opening WRe but is caught by the partition wall WRd, the wire reel WR is pressed toward the rotary table 60 of the right support mechanism 50 by the shaft member 56 of the left support mechanism 48, and therefore a very large pressing force acts on the wire reel WR and the rotary table 60. In this state, even if the feeding mechanism 38 attempts to pull the wire W from the wire reel WR by driving the feeding motor 72, since the wire reel WR cannot be easily rotated with respect to the rotary table 60 and the rotary table 60 cannot be easily rotated with respect to the right housing 16, a very large load is applied to the feeding motor 72. In contrast, in the reinforcing bar binding machine 2 of the present embodiment shown in fig. 10 and 11, the rotary table 60 is movable in the left-right direction with respect to the right housing 16, and the compression spring 68 is provided between the rotary table 60 and the right housing 16, so that even when the engaging projection 60c is caught by the partition wall WRd, a situation in which a large load is applied to the feed motor 72 can be suppressed.

In the above-described embodiment, the configuration in which the storage mechanism 36 includes the plurality of magnets 60d provided on the rotary table 60 and the magnetic sensor 66 provided on the right housing 16 in order to detect the rotation of the wire reel WR is described. In contrast, a plurality of magnets may be directly attached to the wire reel WR at predetermined angular intervals, and the magnet 60d may not be attached to the rotary table 60. In this case, the rotation of the wire reel WR can be detected from the variation in magnetism of the magnet from the wire reel WR detected by the magnetic sensor 66. In addition, when it is not necessary to detect the rotation of the wire reel WR, a plurality of magnets may not be provided in the wire reel WR and the rotary table 60, and the magnetic sensor 66 may not be provided in the right housing 16.

In the above-described embodiment, the configuration in which the storage mechanism 36 includes the plurality of magnets 60d provided on the rotary table 60 and the magnetic sensor 66 provided on the right housing 16 in order to detect the rotation of the wire reel WR is described. In contrast, for example, as shown in fig. 13, the storage mechanism 36 may include a plurality of reflection plates 60e provided on the rotary table 60 and an optical sensor 90 provided on the right housing 16 in order to detect the rotation of the wire reel WR. In the configuration shown in fig. 13, the optical sensor 90 includes a light emitting portion 90a that emits a laser beam for detection toward the wire reel WR, and a light receiving portion 90b that receives the laser beam reflected by the reflection plate 60 e. The light emitting section 90a and the light receiving section 90b of the optical sensor 90 are electrically connected to the control board 34. A plurality of reflection plates 60e are attached to the rotation detection unit 60b of the turntable 60 at predetermined angular intervals. The optical sensor 90 is disposed outside the right housing 16. A through hole, not shown, is formed in the right housing 16 so that the light emitting portion 90a and the light receiving portion 90b of the optical sensor 90 are exposed to the wire reel WR. With the configuration shown in fig. 13, the control board 34 can detect the rotation of the wire reel WR from the change in light detected by the light receiving portion 90b of the optical sensor 90.

In the above-described embodiment, the structure in which the wire reel WR is held at the rear portion of the binding machine main body 4 has been described, but the wire reel WR may be held at other positions. For example, the wire reel WR and the storage mechanism 36 for holding the wire reel WR may be disposed below the binding machine body 4 and in front of the handle 6, for example, between the guide mechanism 42 and the battery mounting portion 8, or the feed mechanism 38 and the brake mechanism 40 may be disposed above the storage mechanism 36.

In the above-described embodiment, the structure in which one wire reel WR is used in the reinforcing bar binding machine 2 has been described, but the reinforcing bar binding machine 2 may be configured to use two or more wire reels WR. For example, the following structure is also possible: the reinforcing bar binding machine 2 includes a plurality of storage mechanisms 36, a plurality of feed mechanisms 38, and a plurality of brake mechanisms 40, and holds a plurality of wire reels WR, respectively, and feeds the wire W from each of the wire reels WR to a guide mechanism 42.

As described above, in one or more embodiments, the reinforcing bar binding machine 2 includes: a wire reel WR (an example of a reel) having a wire W; a rotary table 60 (an example of a wheel shaft) that holds the wire reel WR and is rotatable integrally with the wire reel WR; a right housing 16 (an example of a wheel shaft holding portion) that holds the rotary table 60 rotatably; and a compression spring 68 (an example of an elastic body) interposed between the rotary table 60 and the right housing 16.

With the above configuration, even when the wire reel WR is excessively pressed against the rotary table 60 for some reason, the compression spring 68 can suppress the excessive pressing force from being applied to the wire reel WR and the rotary table 60. This can suppress an increase in resistance when the wire reel WR and the rotary table 60 are rotated. Further, it is possible to suppress an excessive load from being applied to the feed motor 72, which is a driver that draws the wire W from the wire reel WR.

In one or more embodiments, the wire drum WR includes openings WRe divided by the dividing wall WRd. The rotary table 60 includes an engaging projection 60c that enters the opening WRe and abuts against the partition wall WRd in the direction in which the wire reel WR rotates.

As described above, in the configuration in which the partition wall WRd of the wire reel WR and the engagement projection 60c of the rotary table 60 abut against each other in the direction in which the wire reel WR rotates, the wire reel WR and the rotary table 60 can be reliably rotated integrally. However, in the case of such a configuration, when the wire reel WR is attached to the turntable 60, the engagement projection 60c may not enter the opening WRe, and the engagement projection 60c may ride on the partition wall WRd. When the engagement projection 60c is caught by the partition wall WRd, the wire reel WR is pressed against the turntable 60 more than when the engagement projection 60c enters the opening WRe. With the above-described configuration, since the compression spring 68 is interposed between the rotary table 60 and the right housing 16, even when the engaging projection 60c is caught by the partition wall WRd, the excessive pressing force applied to the wire reel WR and the rotary table 60 can be suppressed by the compression spring 68. This can suppress an increase in resistance when the wire reel WR and the rotary table 60 are rotated. Further, it is possible to suppress the application of an excessive load to the feed motor 72 that draws the wire W from the wire reel WR.

In one or more embodiments, the elastic member interposed between the rotary table 60 and the right housing 16 is a compression spring 68.

With the above configuration, when the wire reel WR is excessively pressed against the rotary table 60, it is possible to effectively suppress a situation in which an excessive pressing force acts on the wire reel WR and the rotary table 60.

In one or more embodiments, the reinforcing bar binding machine 2 further includes a left support mechanism 48 (an example of a pressing mechanism) that presses the wire reel WR against the rotating table 60.

With the above configuration, even when the wire reel WR is excessively pressed against the rotary table 60 by the left support mechanism 48, the excessive pressing force applied to the wire reel WR and the rotary table 60 can be suppressed by the compression spring 68 interposed between the rotary table 60 and the right housing 16. This can suppress an increase in resistance when the wire reel WR and the rotary table 60 are rotated. Further, it is possible to suppress the application of an excessive load to the feed motor 72 that draws the wire W from the wire reel WR.

In one or more embodiments, the reinforcing bar binding machine 2 further includes a rotation detection mechanism (e.g., a combination of the magnet 60d and the magnetic sensor 66, or a combination of the reflection plate 60e and the optical sensor 90) that detects rotation of the rotating table 60 with respect to the right housing 16.

When the rotation of the wire reel WR is to be detected by the rotation detecting mechanism as described above, it is necessary to reliably rotate the wire reel WR and the rotary table 60 integrally. However, if the wire drum WR is strongly pressed against the rotary table 60 in order to reliably rotate the wire drum WR and the rotary table 60 integrally, the wire drum WR may be excessively pressed against the rotary table 60. With the above configuration, even when the wire reel WR is excessively pressed against the rotary table 60, the excessive pressing force applied to the wire reel WR and the rotary table 60 can be suppressed by the compression spring 68 interposed between the rotary table 60 and the right housing 16. This can suppress an increase in resistance when the wire reel WR and the rotary table 60 are rotated. Further, it is possible to suppress the application of an excessive load to the feed motor 72 that draws the wire W from the wire reel WR.

In one or more embodiments, the reinforcing bar binding machine 2 includes: a wire reel WR (an example of a reel) having a wire W; a rotary table 60 (an example of a wheel shaft) that holds the wire reel WR and is rotatable integrally with the wire reel WR; and a right housing 16 (an example of an axle holder) that rotatably holds the rotary table 60. The rotary table 60 is configured to be movable with respect to the right housing 16.

With the above configuration, even when the wire reel WR is excessively pressed against the rotary table 60 for some reason, the rotary table 60 moves relative to the right housing 16, thereby suppressing an excessive pressing force from being applied to the wire reel WR and the rotary table 60. The increase in the resistance of the wire reel WR and the rotation table 60 during rotation can be suppressed. Further, it is possible to suppress an excessive load from being applied to the feed motor 72, which is a driver that draws the wire W from the wire reel WR.

In one or more embodiments, the rotary table 60 is movable in a direction along the rotation axis of the wire reel WR with respect to the right housing 16, and is not movable in a direction orthogonal to the rotation axis of the wire reel WR.

When the rotary table 60 is moved relative to the right housing 16, if the rotary shaft of the rotary table 60 is displaced from the rotary shaft of the wire reel WR, resistance when the wire reel WR and the rotary table 60 are integrally rotated increases, and an excessive load is applied to the feed motor 72 that feeds the wire W from the wire reel WR. With the above configuration, even when the rotary table 60 is moved relative to the right housing 16, the rotation axis of the rotary table 60 is not displaced from the rotation axis of the wire reel WR, and therefore, it is possible to suppress an increase in resistance when the wire reel WR and the rotary table 60 are integrally rotated. Further, it is possible to suppress the application of an excessive load to the feed motor 72 that draws the wire W from the wire reel WR.

Specific examples of the present invention have been described in detail, but these are merely examples and do not limit the claims. The technology recited in the claims includes various modifications and changes made to the specific examples illustrated above. The technical elements described in the present specification or drawings can be used in a single technique or in various combinations, and are not limited to the combinations recited in the claims at the time of filing. Further, the technology exemplified in the present specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects has technical usability itself.

Claims

1. A reinforcing bar binding machine, wherein,

this steel bar binding machine includes:

a spool having a steel wire;

an axle that holds the reel and is rotatable integrally with the reel;

an axle holding portion that holds the axle rotatably; and

an elastic body interposed between the wheel shaft and the wheel shaft holding portion.

2. The reinforcing bar binding machine according to claim 1,

the spool includes an opening divided by a partition wall,

the hub includes a snap projection that enters the opening and abuts the partition wall in the direction in which the spool rotates.

3. The reinforcing bar binding machine according to claim 1 or 2,

the elastic body is a compression spring.

4. The reinforcing bar binding machine according to any one of claims 1 to 3,

the reinforcing bar binding machine further includes a pressing mechanism that presses the reel against the axle.

5. The reinforcing bar binding machine according to any one of claims 1 to 4,

the reinforcing bar binding machine further includes a rotation detecting mechanism that detects rotation of the axle with respect to the axle holder.

6. A reinforcing bar binding machine, comprising:

a spool having a steel wire;

an axle that holds the reel and is rotatable integrally with the reel; and

an axle holding portion that holds the axle rotatably,

the axle is configured to be movable relative to the axle holder.

7. The reinforcing bar binding machine according to claim 6,

the axle is movable relative to the axle holding portion in a direction along the rotation axis of the drum and is not movable in a direction orthogonal to the rotation axis of the drum.