JP2021097508A - Reinforcing bar binding machine and electric work machine - Google Patents

Abstract

To provide a technique for controlling a plurality of brushless motors by a single control unit.SOLUTION: A reinforcing bar binding machine includes a feeding mechanism that has a first brushless motor 32 and feeds wires, a twisting mechanism that has a second brushless motor 76, and twists the wire, a control unit 202, and a motor rotation signal input source switching circuit 206. The first brushless motor includes a first hole sensor 180. The second brushless motor includes a second hall sensor 192. The control unit includes a general-purpose input/output port 202c and a motor rotation signal input port 202b. The motor rotation signal input source switching circuit inputs a selected one of the first hall sensor signal and the second hall sensor signal to the motor rotation signal input port. The motor rotation signal input source switching circuit selects one of the first hall sensor signal and the second hall sensor signal according to an input switching signal.SELECTED DRAWING: Figure 20

Description

The techniques disclosed herein relate to rebar binding machines and electric work machines.

Patent Document 1 discloses a reinforcing bar binding machine. The reinforcing bar binding machine has a brushed motor, a feeding mechanism for feeding a wire, and a brushless motor, a twisting mechanism for twisting the wire, and a control for controlling the brushed motor and the brushless motor. It has a unit. The brushless motor includes a hall sensor. The Hall sensor signal from the Hall sensor is input to the control unit.

JP-A-2019-116307

As described above, in the configuration in which the brushless motor is controlled by the control unit, the control unit preferably includes a motor rotation signal input port capable of high-speed signal processing in addition to the normal general-purpose input / output port. When the control unit includes a motor rotation signal input port, the brushless motor can be controlled more accurately by inputting the Hall sensor signal to the motor rotation signal input port.

However, if the control unit is provided with a large number of motor rotation signal input ports, the cost of the control unit will increase. For this reason, if a single control unit is used to control a plurality of brushless motors, a control unit with a separate motor rotation signal input port corresponding to each hall sensor signal can be installed. This will lead to a significant increase in the cost of the control board. The present specification provides a technique capable of accurately controlling a brushless motor without causing a significant cost increase in a configuration in which a plurality of brushless motors are controlled by a single control unit.

The present specification discloses a reinforcing bar binding machine. The reinforcing bar binding machine has a first brushless motor, a feed mechanism for feeding a wire, and a second brushless motor, a twisting mechanism for twisting the wire, the first brushless motor, and the second brushless motor. A control unit for controlling the motor and a motor rotation signal input source switching circuit may be provided. The first brushless motor may include a first hole sensor. The second brushless motor may include a second hole sensor. The control unit may include a general-purpose input / output port and a motor rotation signal input port. The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. You may enter it. The motor rotation signal input source switching circuit may select one of the first hall sensor signal and the second hall sensor signal according to the input switching signal.

According to the above configuration, the first hole sensor signal of the first brushless motor and the second hole sensor signal of the second brushless motor are selectively input to the motor rotation signal input port corresponding to one brushless motor. Can be done. With such a configuration, both the first brushless motor of the feed mechanism and the second brushless motor of the twisting mechanism can be accurately controlled without causing a significant increase in cost.

The present specification also discloses an electric working machine. The electric working machine may include a first brushless motor, a second brushless motor, a control unit for controlling the first brushless motor and the second brushless motor, and a motor rotation signal input source switching circuit. The first brushless motor may include a first hole sensor. The second brushless motor may include a second hole sensor. The control unit may include a general-purpose input / output port and a motor rotation signal input port. The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. You may enter it. The motor rotation signal input source switching circuit may select one of the first hall sensor signal and the second hall sensor signal according to the switching signal.

According to the above configuration, the first hole sensor signal of the first brushless motor and the second hole sensor signal of the second brushless motor are selectively input to the motor rotation signal input port corresponding to one brushless motor. Can be done. With such a configuration, both the first brushless motor and the second brushless motor can be controlled with high accuracy without causing a significant increase in cost.

It is a perspective view of the reinforcing bar binding machine 2 of an Example. It is a side view which shows the internal structure of the reinforcing bar binding machine 2 of an Example. It is a perspective view of the feed mechanism 24 of the reinforcing bar binding machine 2 of an Example. It is sectional drawing in the vicinity of the guide mechanism 26 of the reinforcing bar binding machine 2 of an Example. It is a side view of the holding part 82 and the cutting mechanism 28 in the state where the operated member 72 is in the initial position about the reinforcing bar binding machine 2 of an Example. It is a side view of the holding part 82 and the cutting mechanism 28 in the state where the operated member 72 is in a cutting position about the reinforcing bar binding machine 2 of an Example. It is a perspective view of the twisting mechanism 30 of the reinforcing bar binding machine 2 of an Example. It is a top view of the screw shaft 84, the clamp guide 86, the holding member 90, and the urging member 92 of the reinforcing bar binding machine 2 of the embodiment. FIG. 5 is a cross-sectional perspective view of a holding portion 82 in a state where the outer sleeve 102 of the reinforcing bar binding machine 2 of the embodiment is in the forward position with respect to the clamp guide 86. It is a top view of the upper holding member 114 of the reinforcing bar binding machine 2 of an Example. It is a top view of the lower holding member 116 of the reinforcing bar binding machine 2 of an Example. It is a front view of the holding member 90 of the reinforcing bar binding machine 2 of an Example. FIG. 5 is a cross-sectional perspective view of the holding member 90 and the guide pin 110 in a state where the guide pin 110 is at an intermediate position between the upper guide hole 118a and the lower guide hole 126a for the reinforcing bar binding machine 2 of the embodiment. FIG. 5 is a cross-sectional perspective view of a holding member 90 and a guide pin 110 in a state where the guide pin 110 is at the rear of the upper guide hole 118a and the lower guide hole 126a with respect to the reinforcing bar binding machine 2 of the embodiment. It is a perspective view of the rotation limiting part 150 of the reinforcing bar binding machine 2 of an Example. FIG. 5 is a cross-sectional perspective view of a holding portion 82 in a state where the stepped portion 102a of the outer sleeve 102 and the stepped portion 86c of the clamp guide 86 are in contact with each other for the reinforcing bar binding machine 2 of the embodiment. It is a side view of the holding portion 82 and the rotation limiting portion 150 in a state where the base member 152 and the urging members 162 and 164 are removed from the reinforcing bar binding machine 2 of the embodiment. It is an exploded perspective view of the feed motor 32 and the torsion motor 76 of the reinforcing bar binding machine 2 of an Example. It is a front view of the stators 174, 186 and the sensor boards 178, 190 of the feed motor 32 and the torsion motor 76 of the reinforcing bar binding machine 2 of the embodiment. It is a figure which shows the circuit structure of the control board 20 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows the example of the circuit structure of the inverter circuit 212, 214 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows the example of the circuit structure of the motor control signal output destination switching circuit 204 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows another example of the circuit structure of the motor control signal output destination switching circuit 204 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows still another example of the circuit structure of the motor control signal output destination switching circuit 204 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows the example of the circuit structure of the brake circuit 218, 220 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows the example of the circuit structure of the motor rotation signal input source switching circuit 206 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows another example of the circuit structure of the motor rotation signal input source switching circuit 206 of the reinforcing bar binding machine 2 of an Example. It is a figure which shows still another example of the circuit structure of the motor rotation signal input source switching circuit 206 of the reinforcing bar binding machine 2 of an Example. In the reinforcing bar binding machine 2 of the reference example, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the forward direction. is there. In the reinforcing bar binding machine 2 of the reference example, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the reverse direction. is there. In the reinforcing bar binding machine 2 of the embodiment, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the forward direction. is there. In the reinforcing bar binding machine 2 of the embodiment, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the reverse direction. is there. It is a graph which shows the relationship of the advance angle in torque, the rotation speed and the advance angle control of a general brushless motor. It is a graph which shows the relationship of the advance angle in torque, current and advance angle control of a general brushless motor. In the modified example of the reinforcing bar binding machine 2, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the forward direction. is there. In the modified example of the reinforcing bar binding machine 2, the timing chart of the hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the feed motor 32 and the torsion motor 76 rotate in the reverse direction. is there. It is a flowchart of the process performed by the MCU 202 of the reinforcing bar binding machine 2 of the embodiment. It is a flowchart which shows the detail of the feed motor 1st drive processing of S2 of FIG. 37. It is a flowchart which shows the detail of the 1st drive process of the torsion motor of S4 of FIG. It is a flowchart which shows the detail of the feed motor 2nd drive processing of S6 of FIG. It is a flowchart which shows the detail of the 2nd drive process of the torsion motor of S8 of FIG. It is a flowchart which shows the detail of the 3rd drive process of the torsion motor of S10 of FIG. It is a figure explaining the operation timing of the feed motor 32 and the torsion motor 76 of the reinforcing bar binding machine 2 of an Example.

Representative and non-limiting examples of the present invention will be described in detail below with reference to the drawings. This detailed description is intended to provide those skilled in the art with details for implementing the preferred examples of the invention and is not intended to limit the scope of the invention. Also, the disclosed additional features and inventions can be used separately or together with other features and inventions to provide further improved rebar binding and electric work machines.

In addition, the combination of features and processes disclosed in the following detailed description is not essential for carrying out the present invention in the broadest sense, and is particularly for explaining a typical specific example of the present invention. It is to be described. In addition, the various features of the following representative embodiments, as well as the various features of those described in the claims, are described herein in providing additional and useful embodiments of the present invention. It does not have to be combined as in the example or in the order listed.

All features described herein and / or claims are specified in the disclosure and claims at the time of filing, apart from the composition of the features described in the examples and / or claims. As a limitation to the matter, it is intended to be disclosed individually and independently of each other. In addition, all numerical ranges and statements relating to groups or groups are made with the intention of disclosing their intermediate composition as a limitation to the specific matters stated in the initial disclosure and claims.

In one or more embodiments, the rebar tying machine comprises a first brushless motor, a feed mechanism for feeding wires, a second brushless motor, a twisting mechanism for twisting the wires, and the like. A control unit for controlling the first brushless motor and the second brushless motor, and a motor rotation signal input source switching circuit may be provided. The first brushless motor may include a first hole sensor. The second brushless motor may include a second hole sensor. The control unit may include a general-purpose input / output port and a motor rotation signal input port. The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. You may enter it. The motor rotation signal input source switching circuit may select one of the first hall sensor signal and the second hall sensor signal according to the input switching signal.

According to the above configuration, the first hole sensor signal of the first brushless motor and the second hole sensor signal of the second brushless motor are selectively input to the motor rotation signal input port corresponding to one brushless motor. Can be done. With such a configuration, both the first brushless motor of the feed mechanism and the second brushless motor of the twisting mechanism can be accurately controlled without causing a significant increase in cost.

In one or more embodiments, the input switching signal may be output from the general purpose input / output port of the control unit.

According to the above configuration, the motor rotation signal input source switching circuit can be switched according to the timing of the processing performed by the control unit.

In one or more embodiments, the motor rotation signal input source switching circuit may include a multiplexer.

According to the above configuration, the motor rotation signal input source switching circuit can be realized by a simple configuration.

In one or more embodiments, the first hall sensor signal may also be input to the general purpose input / output port of the control unit. The second hall sensor signal may also be input to the general-purpose input / output port of the control unit.

According to the above configuration, the control unit can monitor which of the first hall sensor signal and the second hall sensor signal is not selected by the motor rotation signal input source switching circuit.

In one or more embodiments, the control unit selects the other from a state in which the motor rotation signal input source switching circuit selects one of the first hall sensor signal and the second hall sensor signal. When it is detected that there is a change in one of the first hall sensor signal and the second hall sensor signal after a predetermined time has elapsed from the time when the state is switched, it is determined that an error has occurred. You may.

For example, if the motor rotation signal input source switching circuit switches from the state in which the first hall sensor signal is selected to the state in which the second hall sensor signal is selected, it is considered that the control unit does not control the first brushless motor thereafter. Therefore, it is considered that the first brushless motor is stopped after the lapse of a predetermined time. When the first brushless motor is stopped, the first hall sensor signal should not change, and if there is a change in the first hall sensor signal, it is considered that some abnormality has occurred. According to the above configuration, the occurrence of such an abnormality can be quickly detected.

In one or more embodiments, the rebar binding machine may further include a motor control signal output destination switching circuit. The control unit may further include a motor control signal output port. The motor control signal output destination switching circuit may output a motor control signal from the control unit to one of the first brushless motor and the second brushless motor. The motor control signal output destination switching circuit may select one of the first brushless motor and the second brushless motor according to the output switching signal.

When the control unit is provided with a motor control signal output port capable of high-speed signal processing, the brushless motor can be controlled more accurately by outputting the motor control signal from the motor control signal output port. According to the above configuration, the motor control signal can be selectively output to the first brushless motor and the second brushless motor from the motor control signal output port corresponding to one brushless motor. With such a configuration, both the first brushless motor of the feed mechanism and the second brushless motor of the twisting mechanism can be accurately controlled without causing a significant increase in cost.

In one or more embodiments, the input switching signal and the output switching signal may be the same signal.

According to the above configuration, the motor rotation signal input source switching circuit and the motor control signal output destination switching circuit are switched by a common signal, so that the circuit configuration can be simplified.

In one or more embodiments, the electric work machine includes a first brushless motor, a second brushless motor, a control unit that controls the first brushless motor and the second brushless motor, and a motor rotation signal input source. A switching circuit may be provided. The first brushless motor may include a first hole sensor. The second brushless motor may include a second hole sensor. The control unit may include a general-purpose input / output port and a motor rotation signal input port. The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. You may enter it. The motor rotation signal input source switching circuit may select one of the first hall sensor signal and the second hall sensor signal according to the input switching signal.

According to the above configuration, the first hole sensor signal of the first brushless motor and the second hole sensor signal of the second brushless motor are selectively input to the motor rotation signal input port corresponding to one brushless motor. Can be done. With such a configuration, both the first brushless motor and the second brushless motor can be controlled with high accuracy without causing a significant increase in cost.

(Example)
As shown in FIG. 1, the reinforcing bar binding machine 2 is a reinforcing bar binding machine that binds a plurality of reinforcing bars R with a wire W. For example, the reinforcing bar binding machine 2 binds a small-diameter reinforcing bar R having a diameter of 16 mm or less and a large-diameter reinforcing bar R having a diameter larger than 16 mm (for example, having a diameter of 25 mm or 32 mm) with a wire W. The diameter of the wire W is, for example, a value between 0.5 mm and 2.0 mm.

The reinforcing bar binding machine 2 includes a main body 4, a grip 6, a battery mounting portion 10, a battery B, and a reel holder 12. The grip 6 is a member for the operator to grip. The grip 6 is provided in the lower part on the rear side of the main body 4. The grip 6 is integrally formed with the main body 4. A trigger 8 is attached to the upper part of the front side of the grip 6. Inside the grip 6, a trigger switch 9 (see FIG. 2) for detecting whether or not the trigger 8 has been pushed is housed. The battery mounting portion 10 is provided at the lower part of the grip 6. The battery mounting portion 10 is integrally formed with the grip 6. The battery B is detachably attached to the battery attachment portion 10. The battery B is, for example, a lithium ion battery. The reel holder 12 is arranged below the main body 4. The reel holder 12 is arranged in front of the grip 6. In this embodiment, the longitudinal direction of the twisting mechanism 30 described later is referred to as a front-rear direction, the direction orthogonal to the front-rear direction is referred to as a vertical direction, and the direction orthogonal to the front-rear direction and the vertical direction is referred to as a left-right direction.

The reel holder 12 includes a holder housing 14 and a cover member 16. The holder housing 14 is attached to the lower part of the front side of the main body 4 and the front part of the battery mounting portion 10. The cover member 16 is rotatably attached to the holder housing 14 around the rotation shaft 14a at the bottom of the holder housing 14. The accommodation space 12a (see FIG. 2) is defined by the holder housing 14 and the cover member 16. A reel 18 around which the wire W is wound is arranged in the accommodation space 12a. That is, the reel holder 12 houses the reel 18 inside.

A display unit 12b and an operation unit 12c are provided on the rear surface of the reel holder 12. The operation unit 12c accepts operations from the user regarding various settings such as the binding force of the reinforcing bar binding machine 2. The display unit 12b can display information regarding the current settings of the reinforcing bar binding machine 2.

As shown in FIG. 2, the reinforcing bar binding machine 2 includes a control board 20 and a display board 22. The control board 20 is housed in the battery mounting portion 10. The control board 20 controls the operation of the reinforcing bar binding machine 2. The display board 22 is housed in the rear part of the reel holder 12. The display board 22 is connected to the control board 20 by wiring (not shown). The display board 22 includes a setting display LED 22a (see FIG. 20) that emits light toward the display unit 12b, and a setting switch 22b (see FIG. 20) that detects an operation on the operation unit 12c by the user.

The reinforcing bar binding machine 2 includes a feed mechanism 24, a guide mechanism 26, a cutting mechanism 28, and a twisting mechanism 30. The feed mechanism 24 is housed in the lower front portion of the main body 4. The feed mechanism 24 executes a feed operation of sending the wire W to the guide mechanism 26 and a pull-back operation of pulling the wire W back from the guide mechanism 26. The guide mechanism 26 is arranged at the front portion of the main body 4. The guide mechanism 26 guides the wire W sent out from the feed mechanism 24 in an annular shape around the reinforcing bar R. The cutting mechanism 28 is housed in the lower part of the main body 4. The cutting mechanism 28 executes a cutting operation of cutting the wire W wound around the reinforcing bar R. The twisting mechanism 30 is housed in the main body 4. The twisting mechanism 30 executes a twisting operation of twisting the wire W around the reinforcing bar R.

(Structure of feed mechanism 24)
As shown in FIG. 3, the feed mechanism 24 includes a feed motor 32, a deceleration unit 34, and a feed unit 36. The feed motor 32 is connected to the control board 20 by wiring (not shown). The feed motor 32 is driven by the electric power supplied from the battery B. The drive of the feed motor 32 is controlled by the control board 20. The feed motor 32 is connected to the drive gear 42 of the feed unit 36 via the reduction unit 34. The speed reduction unit 34 decelerates the rotation of the feed motor 32 by, for example, a planetary gear mechanism and transmits it to the drive gear 42.

In this embodiment, the feed motor 32 is a brushless motor. As shown in FIG. 18, the feed motor 32 includes a stator 174 having a teeth 172 around which a coil 170 is wound, a rotor 176 arranged inside the stator 174, and a sensor substrate 178 fixed to the stator 174. ing. The stator 174 is made of a magnetic material. The rotor 176 includes permanent magnets in which magnetic poles are arranged side by side in the circumferential direction. As shown in FIG. 19, the hall sensor 180 is provided on the sensor substrate 178. The Hall sensor 180 includes a first Hall element 180a, a second Hall element 180b, and a third Hall element 180c. The first Hall element 180a, the second Hall element 180b, and the third Hall element 180c detect the magnetic force from the rotor 176. The Hall sensor 180 is located on the sensor substrate 178 at a position where the electric angle is advanced by 25 ° with respect to the forward rotation of the feed motor 32 and the electric angle is retarded by 25 ° with respect to the reverse rotation of the feed motor 32. Have been placed. In this embodiment, the control board 20 outputs a pattern for each 60 ° electric angle shifted by one step with respect to the reverse rotation of the feed motor 32. Therefore, the forward rotation of the feed motor 32 is controlled by an advance angle of 25 °, and the reverse rotation of the feed motor 32 is controlled by an advance angle of 60 ° -25 ° = 35 °. Will be done.

As shown in FIG. 3, the feed portion 36 includes a base member 38, a guide member 40, a drive gear 42, a first gear 44, a second gear 46, a gear support member 48, and an urging member 52. , Is equipped. The guide member 40 is fixed to the base member 38. The guide member 40 has a guide hole 40a. The guide hole 40a has a tapered shape with a wide lower end and a narrow upper end. The wire W is inserted into the guide hole 40a.

The drive gear 42 is connected to the reduction gear 34. The first gear 44 is rotatably supported by the base member 38. The first gear 44 meshes with the drive gear 42. The first gear 44 is rotated by the rotation of the drive gear 42. The first gear 44 has a groove 44a. The groove 44a is formed on the outer peripheral surface of the first gear 44 in a direction along the rotation direction of the first gear 44. The second gear 46 meshes with the first gear 44. The second gear 46 is rotatably supported by the gear support member 48. The second gear 46 has a groove 46a. The groove 46a is formed on the outer peripheral surface of the second gear 46 in a direction along the rotation direction of the second gear 46. The gear support member 48 is swingably supported by the base member 38 via the swing shaft 48a. The urging member 52 urges the gear support member 48 in the direction in which the second gear 46 approaches the first gear 44. As a result, the second gear 46 is pressed against the first gear 44. As a result, the wire W is sandwiched between the groove 44a of the first gear 44 and the groove 46a of the second gear 46. When the gear support member 48 is pushed against the urging force of the urging member 52, the second gear 46 separates from the first gear 44. As a result, when the reel 18 is replaced, the wire W can be easily passed between the groove 44a of the first gear 44 and the groove 46a of the second gear 46.

The wire W moves when the feed motor 32 rotates while the wire W is sandwiched between the groove 44a of the first gear 44 and the groove 46a of the second gear 46. In this embodiment, when the feed motor 32 rotates in the reverse direction, the drive gear 42 rotates in the direction D1 shown in FIG. 3, and the wire W is fed toward the guide mechanism 26. When the feed motor 32 rotates in the forward direction, the drive gear 42 rotates in the direction D2 shown in FIG. 3, and the wire W is pulled back from the guide mechanism 26.

(Structure of guidance mechanism 26)
As shown in FIG. 4, the guide mechanism 26 includes a wire guide 56, an upper guide arm 58, and a lower guide arm 60. The wire W after being fed from the feeding mechanism 24 passes through the inside of the wire guide 56. A protrusion 56a is formed inside the wire guide 56.

The upper guide arm 58 is provided on the front upper portion of the main body 4. The upper guide arm 58 has an upper guide passage 58a. The wire W that has passed through the inside of the wire guide 56 passes through the upper guide passage 58a. A first guide pin 61 and a second guide pin 62 are arranged in the upper guide passage 58a. When the wire W passes through the upper guide passage 58a while in contact with the protrusion 56a of the wire guide 56, the first guide pin 61, and the second guide pin 62, the wire W is provided with a downward winding.

The lower guide arm 60 is provided in the lower front part of the main body 4. The lower guide arm 60 has a lower guide passage 60a. The wire W that has passed through the upper guide passage 58a passes through the lower guide passage 60a. In FIG. 4, a part of the wire W hidden by the lower guide arm 60 and the twisting mechanism 30 and cannot be seen is illustrated by a broken line.

(Structure of cutting mechanism 28)
As shown in FIG. 5, the cutting mechanism 28 includes a cutting member 66 and a link portion 68. The cutting member 66 is a member that cuts the wire W. As shown in FIG. 4, the cutting member 66 is arranged on the passage through which the wire W sent from the feed mechanism 24 to the guide mechanism 26 passes. The wire W passes through the inside of the cutting member 66. The cutting member 66 is rotatably supported around a rotation shaft 66a (see FIG. 5) with respect to the main body 4. When the cutting member 66 rotates in the direction D3 shown in FIG. 4, the cutting member 66 cuts the wire W.

As shown in FIG. 5, the link portion 68 includes a connecting member 70, a operated member 72, and an urging member 74. The connecting member 70 connects the cutting member 66 and the operated member 72. The operated member 72 is rotatably supported around the rotation shaft 72a with respect to the main body 4. The operated member 72 is normally urged to an initial position by the urging member 74. When a force larger than the urging force of the urging member 74 is applied to the operated member 72, the operated member 72 rotates around the rotation shaft 72a. As a result, the connecting member 70 moves forward, and the cutting member 66 rotates around the rotation shaft 66a. When the operated member 72 rotates around the rotation shaft 72a from the initial position to a predetermined position shown in FIG. 6, the wire W is cut by the rotation of the cutting member 66. Hereinafter, the position of the operated member 72 in the above state is referred to as a cutting position.

(Structure of twisting mechanism 30)
As shown in FIG. 7, the twisting mechanism 30 includes a twisting motor 76, a speed reducing unit 78, and a holding unit 82. The torsion motor 76 is connected to the control board 20 by wiring (not shown). The torsion motor 76 is driven by the electric power supplied from the battery B. The drive of the torsion motor 76 is controlled by the control board 20. The torsion motor 76 is connected to the screw shaft 84 of the holding portion 82 via the speed reducing portion 78. The speed reduction unit 78 decelerates the rotation of the torsion motor 76 by, for example, a planetary gear mechanism and transmits it to the screw shaft 84.

In this embodiment, the torsion motor 76 is a brushless motor. In this embodiment, the torsion motor 76 has the same configuration as the feed motor 32. As shown in FIG. 18, the torsion motor 76 includes a stator 186 having a teeth 184 around which a coil 182 is wound, a rotor 188 arranged inside the stator 186, and a sensor substrate 190 fixed to the stator 186. ing. The stator 186 is made of a magnetic material. The rotor 188 includes permanent magnets in which magnetic poles are arranged side by side in the circumferential direction. As shown in FIG. 19, the hall sensor 192 is provided on the sensor substrate 190. The Hall sensor 192 includes a first Hall element 192a, a second Hall element 192b, and a third Hall element 192c. The first Hall element 192a, the second Hall element 192b, and the third Hall element 192c detect the magnetic force from the rotor 188. The Hall sensor 192 is located on the sensor substrate 190 at a position where the electric angle is advanced by 25 ° with respect to the forward rotation of the torsion motor 76 and the electric angle is retarded by 25 ° with respect to the reverse rotation of the torsion motor 76. Have been placed. In this embodiment, the control board 20 outputs a pattern for each 60 ° electric angle shifted by one step with respect to the reverse rotation of the torsion motor 76. Therefore, the forward rotation of the torsion motor 76 is controlled by an advance angle of 25 °, and the reverse rotation of the torsion motor 76 is controlled by an advance angle of 60 ° -25 ° = 35 °. Will be done.

In this embodiment, the torsion motor 76 and the feed motor 32 have the same configuration. Therefore, common parts are used for the stator 174 and the stator 186, common parts are used for the rotor 176 and the rotor 188, and common parts are used for the sensor board 178 and the sensor board 190. ing.

As shown in FIG. 7, the holding portion 82 includes a screw shaft 84, a clamp guide 86 (see FIGS. 8 and 9), an urging member 92 (see FIGS. 8 and 9), a sleeve 88, and a holding member. 90 and.

The screw shaft 84 is connected to the speed reduction unit 78. When the torsion motor 76 rotates in the forward direction, the screw shaft 84 is viewed from the rear, and the screw shaft 84 rotates in the direction of the left-hand screw. When the torsion motor 76 rotates in the reverse direction, the screw shaft 84 rotates in the right-handed direction when the screw shaft 84 is viewed from the rear.

As shown in FIG. 8, the screw shaft 84 includes a large diameter portion 84a and a small diameter portion 84b. The large diameter portion 84a is located at the rear portion of the screw shaft 84, and the small diameter portion 84b is located at the front portion of the screw shaft 84. A spiral ball groove 84c is formed on the outer peripheral surface of the large diameter portion 84a. The ball 94 fits into the ball groove 84c. An annular washer 96 is arranged at the step between the large diameter portion 84a and the small diameter portion 84b. An engaging groove 84d is formed in the front portion of the small diameter portion 84b.

As shown in FIG. 9, the front portion of the small diameter portion 84b is inserted into the recess 86a of the clamp guide 86. The engaging pin 86b of the clamp guide 86 penetrates into the engaging groove 84d of the small diameter portion 84b of the screw shaft 84 and can engage with the front side surface and the rear side surface of the engaging groove 84d. A step portion 86c is formed on the outer peripheral surface of the clamp guide 86. The outer peripheral surface of the clamp guide 86 located behind the step portion 86c has a larger diameter than the outer peripheral surface of the clamp guide 86 located in front of the step portion 86c.

Further, the small diameter portion 84b is inserted through the urging member 92. The urging member 92 is arranged between the washer 96 and the clamp guide 86. The urging member 92 urges the clamp guide 86 in a direction away from the washer 96.

The screw shaft 84 and the clamp guide 86 are inserted into the sleeve 88. The sleeve 88 includes an inner sleeve 100 and an outer sleeve 102. A large diameter portion 84a of the screw shaft 84 is inserted through the inner sleeve 100. A ball hole (not shown) is formed in the inner sleeve 100. The ball 94 fits into the ball hole. The inner sleeve 100 is connected to the screw shaft 84 via a ball 94 fitted between the ball groove 84c and the ball hole, that is, via a ball screw. In the range where the ball groove 84c is formed, when the screw shaft 84 rotates with respect to the inner sleeve 100, the inner sleeve 100 moves in the front-rear direction with respect to the screw shaft 84.

A screw shaft 84, a clamp guide 86, and an inner sleeve 100 are inserted into the outer sleeve 102. The outer sleeve 102 has a cylindrical shape extending in the front-rear direction. A step portion 102a is formed on the inner peripheral surface of the outer sleeve 102. The inner peripheral surface of the outer sleeve 102 in front of the step portion 102a has a smaller diameter than the inner peripheral surface of the outer sleeve 102 behind the step portion 102a. The outer sleeve 102 is fixed to the inner sleeve 100 by a set screw 106. The outer sleeve 102 operates (ie, moves or rotates) with the inner sleeve 100. In the range where the ball groove 84c is formed, when the screw shaft 84 rotates with respect to the inner sleeve 100, the outer sleeve 102 moves in the front-rear direction with respect to the screw shaft 84 together with the inner sleeve 100. Further, when the screw shaft 84 rotates with respect to the inner sleeve 100, the outer sleeve 102 moves between the forward position and the reverse position with respect to the clamp guide 86. In the following, the movement of the outer sleeve 102 toward the forward position (that is, forward) with respect to the clamp guide 86 is referred to as the outer sleeve 102 moving forward, and the outer sleeve 102 retracts with respect to the clamp guide 86. Moving toward a position (that is, toward the rear) means that the outer sleeve 102 retracts.

The holding portion 82 further includes a support member 104. The support member 104 covers the outer peripheral surface of the outer sleeve 102. The support member 104 is rotatable with respect to the outer sleeve 102. The support member 104 can move in the front-rear direction with respect to the outer sleeve 102. The outer sleeve 102 is supported by the main body 4 via the support member 104.

The clamp member 90 is supported by the front portion of the clamp guide 86. The sandwiching member 90 is movably supported with respect to the outer sleeve 102 by two guide pins 110 (see FIG. 8) included in the outer sleeve 102. The sandwiching member 90 is a member that sandwiches the wire W. The sandwiching member 90 opens and closes in conjunction with the rotation of the screw shaft 84.

The sandwiching member 90 includes an upper sandwiching member 114 and a lower sandwiching member 116. The upper holding member 114 faces the lower holding member 116 in the vertical direction. As shown in FIG. 10, the upper holding member 114 includes an upper base 118, a first upper protrusion 120, an upper connecting portion 121, and a second upper protrusion 122. The upper base 118 is a portion supported by the clamp guide 86 and the guide pin 110. The upper base 118 includes two upper guide holes 118a. The two upper guide holes 118a have the same shape as each other. The two upper guide holes 118a extend in the front-rear direction and are inclined to the right from the rear to the front when the upper base 118 is viewed from above.

The first upper protrusion 120 extends forward from the left front end of the upper base 118. The upper connecting portion 121 extends from the central right end portion of the first upper protruding portion 120 toward the right. The second upper protrusion 122 extends forward from the upper connecting portion 121. The first upper protrusion 120 and the second upper protrusion 122 are separated from each other in the left-right direction. A first wire passage 124 is formed between the first upper protrusion 120 and the second upper protrusion 122. The wire W passes through the first wire passage 124 after being fed from the feed mechanism 24 and before reaching the upper guide passage 58a of the guide mechanism 26.

The sandwiching member 90 further includes a first retaining portion 123 shown in FIG. The first retaining portion 123 is integrally formed with the upper holding member 114. The first retaining portion 123 extends downward from the front end portion of the second upper protrusion 122. The first retaining portion 123 partially overlaps the lower holding member 116 in the front-rear direction. The first retaining portion 123 prevents the wire W sandwiched by the sandwiching member 90 from coming out of the sandwiching member 90.

As shown in FIG. 11, the lower holding member 116 includes a lower base 126, a first lower protrusion 128, a lower connecting portion 129, and a second lower protrusion 130. The lower base 126 is a portion supported by the clamp guide 86 and the guide pin 110. The lower base 126 is provided with two lower guide holes 126a. The shape of the lower guide hole 126a when the lower base portion 126 is viewed from above is plane-symmetric with the shape of the upper guide hole 118a when the upper base portion 118 is viewed from above with respect to a plane orthogonal to the left-right direction. There is a relationship. That is, the two lower guide holes 126a extend in the front-rear direction and are inclined to the left from the rear to the front when the lower base 126 is viewed from above.

The first lower protrusion 128 extends forward from the right front end of the lower base 126. The lower connecting portion 129 extends from the central left end of the first lower protruding portion 128 toward the left. The second lower protrusion 130 extends forward from the central front end of the lower connecting portion 129. The first lower protrusion 128 and the second lower protrusion 130 are separated from each other in the left-right direction. A second wire passage 132 is formed between the first lower protrusion 128 and the second lower protrusion 130. The wire W after passing through the lower guide passage 60a of the guide mechanism 26 passes through the second wire passage 132.

The sandwiching member 90 further includes a second retaining portion 131. The second retaining portion 131 is integrally formed with the lower holding member 116. The second retaining portion 131 extends to the left from the left front end portion of the second lower protrusion 130. The second retaining portion 131 prevents the wire W sandwiched by the sandwiching member 90 from coming out of the sandwiching member 90. The second retaining portion 131 and the lower connecting portion 129 are separated from each other in the front-rear direction. An auxiliary passage 134 is formed between the second retaining portion 131 and the lower connecting portion 129.

As shown in FIG. 8, with the upper holding member 114 and the lower holding member 116 overlapping in the vertical direction, the guide pin 110 of the outer sleeve 102 has the upper guide hole 118a and the lower guide hole 126a, respectively. It is inserted in. When the outer sleeve 102 moves in the front-rear direction with respect to the clamp guide 86, the guide pin 110 moves in the front-rear direction in the upper guide hole 118a and in the lower guide hole 126a. When the guide pin 110 is arranged in front of the upper guide hole 118a and the lower guide hole 126a, the first wire passage 124 and the second wire passage 132 are open as shown in FIG. The state of the holding member 90 at this time is called a fully open state.

When the outer sleeve 102 retracts with respect to the clamp guide 86, the guide pin 110 moves rearward in the upper guide hole 118a and the lower guide hole 126a. When the upper holding member 114 moves to the right with respect to the clamp guide 86, the lower holding member 116 moves to the left with respect to the clamp guide 86 (that is, the direction opposite to the direction in which the upper holding member 114 moves). Move towards. The distance that the upper holding member 114 moves to the right is the same as the distance that the lower holding member 116 moves to the left. When the sandwiching member 90 is viewed in the vertical direction, the upper sandwiching member 114 and the lower sandwiching member 116 move in directions close to each other. As shown in FIG. 13, when the guide pin 110 moves in the upper guide hole 118a and the lower guide hole 126a to an intermediate position, the second wire passage 132 is blocked by the second upper protrusion 122. On the other hand, the first wire passage 124 is opened by the auxiliary passage 134 formed in the second lower protrusion 130. The state of the holding member 90 at this time is called a half-open state. When the wire W is arranged in the second wire passage 132, the wire W is sandwiched and fixed at the first sandwiching portion P1 between the second upper protrusion 122 and the first lower protrusion 128. Hereinafter, the portion of the wire W sandwiched by the first sandwiched portion P1 is referred to as the first sandwiched portion WP1. In the half-open state, the first retaining portion 123 closes the first sandwiching portion P1 from the front. In FIG. 13, the position of the first retaining portion 123 in the front-rear direction is shown by a broken line. The first retaining portion 123 is arranged between the reinforcing bar R (not shown in FIG. 13) and the first sandwiching portion P1.

As shown in FIG. 14, when the guide pin 110 moves to the rear of the upper guide hole 118a and the lower guide hole 126a, the first wire passage 124 is blocked by the second lower protrusion 130. The second wire passage 132 remains blocked by the second upper protrusion 122. The state of the holding member 90 at this time is called a fully closed state. When the wire W is arranged in the first wire passage 124, the wire W is held by the first pinching portion P1 of the pinching member 90 while the first pinched portion WP1 of the wire W is held by the first pinching portion P1 of the pinching member 90. It is sandwiched and fixed at the second sandwiching point P2 between the wire and the second lower protrusion 130. Hereinafter, the portion of the wire W sandwiched by the second sandwiched portion P2 is referred to as the second sandwiched portion WP2. In the fully closed state, the first retaining portion 123 closes the first pinching portion P1 from the front, and the second retaining portion 131 is arranged directly below and in front of the second pinching portion P2. In FIG. 14, the front end portion of the second retaining portion 131 is illustrated by a broken line having a shorter pitch than the broken line indicating the first retaining portion 123. The second retaining portion 131 is arranged between the reinforcing bar R (not shown in FIG. 14) and the second sandwiching portion P2.

As shown in FIG. 7, the holding portion 82 further includes a push plate 140. The push plate 140 is sandwiched between the rib 100a formed at the rear end of the inner sleeve 100 and the rear end of the outer sleeve 102. The push plate 140 moves in the front-rear direction with respect to the screw shaft 84 together with the inner sleeve 100 and the outer sleeve 102 by the rotation of the screw shaft 84 accompanying the drive of the torsion motor 76.

As shown in FIGS. 5 and 6, the push plate 140 operates the operated member 72 of the cutting mechanism 28. As shown in FIG. 5, the push plate 140 is normally separated from the projecting piece 72b of the operated member 72. At this time, the operated member 72 is located at the initial position. When the push plate 140 retracts with respect to the screw shaft 84 due to the rotation of the screw shaft 84, the push plate 140 abuts on the projecting piece 72b and pushes the operated member 72 backward. As a result, the operated member 72 rotates around the rotation shaft 72a, the connecting member 70 moves forward, and the cutting member 66 rotates around the rotation shaft 66a. The push plate 140 can operate the cutting member 66 by operating the operated member 72. As shown in FIG. 6, when the operated member 72 rotates to the cutting position, the cutting member 66 cuts the wire W passing through the inside of the cutting member 66. After that, when the push plate 140 advances with respect to the screw shaft 84 by the rotation of the screw shaft 84, the operated member 72 is urged by the urging member 74 and rotates around the rotation shaft 72a to the initial position. As a result, the connecting member 70 and the cutting member 66 also return to the state shown in FIG.

The push plate 140 is provided with an initial state detection magnet 140a and a grip detection magnet 140b. As shown in FIG. 7, the twisting mechanism 30 includes an initial state detection sensor 136 that detects the magnetic force from the initial state detection magnet 140a and a grip detection sensor 138 that detects the magnetic force from the grip detection magnet 140b. The positions of the initial state detection sensor 136 and the grip detection sensor 138 are fixed with respect to the main body 4. When the twisting mechanism 30 is in the initial state, the initial state detection sensor 136 is arranged so as to face the initial state detection magnet 140a. Therefore, the initial state detection sensor 136 can detect whether or not the twisting mechanism 30 is in the initial state. In the twisting mechanism 30, the grip detection sensor 138 is arranged to face the grip detection magnet 140b when the pinch member 90 is in the half-open state, that is, when the pinch member 90 holds the front end of the wire W. Therefore, the grip detection sensor 138 can detect whether or not the holding member 90 is in a state of holding the front end of the wire W in the twisting mechanism 30.

As shown in FIG. 7, fins 144 are formed on the outer peripheral surface of the rear part of the outer sleeve 102. The fins 144 extend in the front-rear direction. Fins 144 allow or prohibit rotation of the outer sleeve 102. In this embodiment, eight fins are arranged on the outer peripheral surface of the outer sleeve 102 with a distance of 45 degrees from each other. Further, in this embodiment, the fin 144 includes seven short fins 146 and one long fin 148. The length of the long fin 148 in the front-rear direction is longer than the length of the short fin 146 in the front-rear direction. In the front-rear direction, the position of the front end portion of the long fin 148 is the same as the position of the front end portion of the short fin 146. On the other hand, in the front-rear direction, the rear end portion of the long fin 148 is behind the rear end portion of the short fin 146.

The reinforcing bar binding machine 2 further includes a rotation limiting unit 150 shown in FIG. As shown in FIG. 17, the rotation limiting portion 150 is arranged at a position close to the outer sleeve 102. The rotation limiting unit 150 cooperates with the fins 144 to allow or prohibit the rotation of the outer sleeve 102. As shown in FIG. 15, the rotation limiting portion 150 includes a base member 152, an upper stopper 154, a lower stopper 156, swing shafts 158 and 160, and urging members 162 and 164. The base member 152 is fixed to the main body 4. The upper stopper 154 is swingably supported by the base member 152 via the swing shaft 158. The upper stopper 154 includes a regulation piece 154a. The regulation piece 154a is located below the upper stopper 154. The urging member 162 urges the regulation piece 154a in the direction of opening outward (that is, the direction in which the regulation piece 154a separates from the base member 152).

When the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the direction of the right-handed screw, the short fin 146 and the long fin 148 push the regulation piece 154a. Therefore, the upper stopper 154 does not prohibit the rotation of the outer sleeve 102. On the other hand, when the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the direction of the left-hand screw, the short fin 146 and the long fin 148 come into contact with the regulation piece 154a in the rotation direction of the outer sleeve 102. Therefore, the upper stopper 154 prohibits the rotation of the outer sleeve 102. When the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the right-handed direction, it corresponds to the case where the twisting mechanism 30 finishes twisting the wire W around the reinforcing bar R and returns to the initial state. Further, when the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the direction of the left-hand screw, it corresponds to the case where the twisting mechanism 30 sandwiches and twists the wire W around the reinforcing bar R.

The lower stopper 156 is swingably supported by the base member 152 via the swing shaft 160. The lower stopper 156 includes a regulation piece 156a. The control piece 156a is located above the lower stopper 156. The regulation piece 156a faces the regulation piece 154a. The rear end portion of the regulation piece 156a is arranged behind the rear end portion of the regulation piece 154a. The front end portion of the regulation piece 156a is arranged behind the front end portion of the regulation piece 154a. The urging member 164 is urging the regulation piece 156a in the direction of opening outward (that is, the direction in which the regulation piece 156a is separated from the base member 152).

When the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the right-handed direction, the short fins 146 and the long fins 148 come into contact with the regulation piece 156a in the rotation direction of the outer sleeve 102. Therefore, the lower stopper 156 prohibits the rotation of the outer sleeve 102. On the other hand, when the screw shaft 84 is viewed from the rear and the screw shaft 84 rotates in the direction of the left-hand screw, the short fin 146 and the long fin 148 push the regulation piece 156a. Therefore, the lower stopper 156 does not prohibit the rotation of the outer sleeve 102.

Regarding the mechanical configuration of the reinforcing bar binding machine 2, various changes may be made to the above configuration. For example, in the reinforcing bar binding machine 2, the reel holder 12 may be arranged at the rear part of the main body 4, or the feed mechanism 24 may be arranged between the reel holder 12 of the main body 4 and the guide mechanism 26. In this case, the reel 18, the feed motor 32, and the torsion motor 76 are all arranged above the grip 6. Alternatively, the control board 20 and the display board 22 may be housed inside the main body 4. In this case, the control board 20 and the display board 22 are arranged above the grip 6.

(Operation of rebar binding machine 2)
Next, the operation of the reinforcing bar binding machine 2 binding the reinforcing bars R with the wire W will be described with reference to FIGS. 4, 9, 16 and 17. When the reinforcing bar binding machine 2 binds the reinforcing bar R with the wire W, the feeding step, the tip holding step, the pulling back step, the rear end holding step, the cutting step, the pulling step, and the twisting step are performed in this order. Will be executed. Here, in the initial state before the reinforcing bar binding machine 2 executes the operation of binding the reinforcing bars R with the wire W, as shown in FIG. 9, only the front portion of the screw shaft 84 is arranged inside the inner sleeve 100. There is. Further, the long fin 148 is sandwiched between the regulation piece 154a of the upper stopper 154 and the regulation piece 156a of the lower stopper 156. Further, the outer sleeve 102 is in the forward position with respect to the clamp guide 86. The two guide pins 110 are located in front of the two upper guide holes 118a and the two lower guide holes 126a, and the holding member 90 is in a fully open state. As shown in FIG. 5, the push plate 140 is separated from the projecting piece 72b of the operated member 72, and the operated member 72 is in the initial position.

(Sending process)
When the feed motor 32 rotates in the reverse direction from the initial state, the feed mechanism 24 feeds the wire W wound around the reel 18 by a predetermined length. The tip of the wire W passes through the inside of the cutting member 66, the first wire passage 124, the upper guide passage 58a, the lower guide passage 60a, and the second wire passage 132 in this order. As a result, as shown in FIG. 4, the wire W is wound around the reinforcing bar R in an annular shape.

(Tip holding process)
From this state, when the torsion motor 76 rotates in the forward direction, the screw shaft 84 rotates in the direction of the left-hand screw. The long fin 148 is in contact with the regulation piece 154a of the upper stopper 154 in the rotation direction of the outer sleeve 102, and the rotation of the outer sleeve 102 in the left-hand screw direction is prohibited. Therefore, the outer sleeve 102 retracts with respect to the clamp guide 86 together with the inner sleeve 100. As the outer sleeve 102 retracts, the two guide pins 110 move from the front to the intermediate position in the two upper guide holes 118a and the two lower guide holes 126a. The sandwiching member 90 changes from a fully open state to a half-open state, and a portion near the tip of the wire W (that is, a first covering) is provided at the first sandwiching portion P1 between the second upper protrusion 122 and the first lower protrusion 128. The sandwiched portion WP1) is sandwiched and fixed. As a result, the portion near the tip of the wire W is held by the sandwiching member 90. In this state, the first retaining portion 123 closes the first holding portion P1 of the holding member 90 from the front.

(Pulling back process)
From this state, when the torsion motor 76 is stopped and the feed motor 32 rotates in the forward direction, the feed portion 36 pulls back the wire W around the reinforcing bar R. The vicinity of the tip of the wire W is held by the sandwiching member 90, and the diameter of the wire W around the reinforcing bar R is reduced.

(Rear end holding process)
From this state, when the torsion motor 76 rotates in the forward direction again, the outer sleeve 102 further retracts with respect to the clamp guide 86 together with the inner sleeve 100. As the outer sleeve 102 retracts, the two guide pins 110 move from the intermediate position to the rear in the two upper guide holes 118a and the two lower guide holes 126a. The sandwiching member 90 changes from a half-open state to a fully closed state, and is located near the rear end of the wire W at the second sandwiching portion P2 between the first upper protrusion 120 and the second lower protrusion 130 (that is, the second 2 The pinched portion WP2) is pinched and fixed. As a result, the portion near the rear end of the wire W is held by the sandwiching member 90. In this state, the first retaining portion 123 closes the first sandwiching portion P1 of the sandwiching member 90 from the front, and the second retaining portion 131 is arranged directly below the second sandwiching portion P2 of the sandwiching member 90. ing. Further, the first retaining portion 123 and the second retaining portion 131 are arranged between the reinforcing bar R and the wire W.

(Cutting process)
From this state, the outer sleeve 102 further retracts with respect to the clamp guide 86 as the torsion motor 76 rotates forward. As shown in FIG. 6, the push plate 140 is retracted together with the outer sleeve 102, abuts on the projecting piece 72b of the operated member 72, and is pushed backward. When the operated member 72 rotates around the rotation shaft 72a to a cutting position, the cutting member 66 rotates around the rotation shaft 66a to a predetermined position. As a result, the wire W passing through the inside of the cutting member 66 is cut. The wire W around the reinforcing bar R is held by the sandwiching member 90 at two points, the vicinity of the front end portion and the vicinity of the rear end portion of the wire W.

(Pulling process)
From this state, when the outer sleeve 102 further retracts with respect to the clamp guide 86 with the forward rotation of the torsion motor 76, the step portion 102a of the outer sleeve 102 hits the step portion 86c of the clamp guide 86, as shown in FIG. Touch. Therefore, the outer sleeve 102 cannot be further retracted with respect to the clamp guide 86, and is retracted integrally with the clamp guide 86. As a result, the sandwiching member 90 retracts, that is, the sandwiching member 90 moves in the direction away from the reinforcing bar R, and the wire W around the reinforcing bar R is pulled in the direction away from the reinforcing bar R. While the pulling step is being executed, the first retaining portion 123 closes the front of the first pinching portion P1, and the second retaining portion 131 is arranged directly below and in front of the second pinching portion P2. .. Therefore, when the wire W moves forward with respect to the holding member 90 due to the tension applied to the wire W as the wire W is pulled, the portion WP1 near the tip of the wire W becomes the first retaining portion 123. The contact is made, and the portion WP2 near the rear end of the wire W abuts on the second retaining portion 131. As a result, the wire W is pulled in the direction away from the reinforcing bar R without coming out of the holding member 90.

(Twisting process)
From this state, when the outer sleeve 102 retracts together with the clamp guide 86 with the forward rotation of the torsion motor 76, the long fins 148 and the regulation piece 154a of the upper stopper 154 in the rotation direction of the outer sleeve 102, as shown in FIG. It will not come into contact. This allows the outer sleeve 102 to rotate in the direction of the left-hand thread. In this state, the urging member 92 is compressed, and the urging force for urging the clamp guide 86 in the direction away from the washer 96 is applied to the clamp guide 86 from the urging member 92. Therefore, a frictional force acts between the ball 94 fitted in the ball hole of the inner sleeve 100 and the ball groove 84c of the screw shaft 84. As a result, when the clamp guide 86 rotates, the outer sleeve 102 does not retract with respect to the screw shaft 84, and the outer sleeve 102 rotates integrally with the screw shaft 84 in the direction of the left-handed screw. As a result, the clamp guide 86 and the holding member 90 rotate in the direction of the left-hand screw, and the wire W held by the holding member 90 is twisted. While the twisting step is being executed, the first retaining portion 123 is blocking the front of the first holding portion P1 and the second retaining portion 131 is the second retaining portion 131, as in the case where the pulling process is being executed. 2 It is arranged directly below and in front of the pinching point P2. Therefore, when the wire W moves forward with respect to the holding member 90 due to the tension applied to the wire W as the wire W is twisted, the portion WP1 near the tip of the wire W becomes the first retaining portion 123. The contact is made, and the portion WP2 near the rear end of the wire W abuts on the second retaining portion 131. As a result, the wire W is twisted without coming out of the holding member 90.

(Initial state return process)
After that, the torsion motor 76 rotates in the reverse direction, and the screw shaft 84 rotates in the direction of the right-handed screw. The outer sleeve 102 rotates in the right-handed direction, and the short fin 146 or the long fin 148 comes into contact with the regulation piece 156a of the lower stopper 156, so that the outer sleeve 102 is prohibited from rotating in the right-handed direction. An urging force for urging the clamp guide 86 in the direction away from the washer 96 is applied to the clamp guide 86 from the urging member 92, and the outer sleeve 102 advances integrally with the clamp guide 86. When the engaging pin 86b abuts on the front end of the engaging groove 84d, the outer sleeve 102 advances with respect to the clamp guide 86. When the two guide pins 110 move from the rear to the front in the two upper guide holes 118a and the two lower guide holes 126a, the holding member 90 changes to the fully open state. As a result, the wire W held by the holding member 90 is released from the holding member 90. When the short fin 146 is in contact with the regulation piece 156a, the outer sleeve 102 advances with respect to the clamp guide 86, and when the short fin 146 moves forward from the front end portion of the regulation piece 156a, the outer sleeve 102 moves again. Rotate in the direction of the right-handed screw. When the long fin 148 comes into contact with the regulation piece 156a, the rotation of the outer sleeve 102 is prohibited. As a result, the twisting mechanism 30 returns to the initial state.

(Circuit configuration of control board 20)
As shown in FIG. 20, the control board 20 includes a control power supply circuit 200, an MCU (Micro Control Unit) 202, a motor control signal output destination switching circuit 204, a motor rotation signal input source switching circuit 206, and gate drive circuits 208 and 210. , Inverter circuits 212, 214, current detection circuits 216, brake circuits 218, 220 and the like are provided.

The control power supply circuit 200 adjusts the electric power supplied from the battery B to a predetermined voltage, and supplies the electric power to the MCU 202, the brake circuits 218, 220, and the like.

As shown in FIG. 21, the inverter circuit 212 includes switching elements 222a, 222b, 224a, 224b, 226a, and 226b. The switching elements 222a, 222b, 224a, 224b, 226a, and 226b are field effect transistors, and more specifically, MOSFETs having an insulated gate. The switching element 222a connects the positive electrode side potential line 228 and the motor power line 232. The switching element 222b connects the negative electrode side potential line 230 and the motor power line 232. The switching element 224a connects the positive electrode side potential line 228 and the motor power line 234. The switching element 224b connects the negative electrode side potential line 230 and the motor power line 234. The switching element 226a connects the positive electrode side potential line 228 and the motor power line 236. The switching element 226b connects the negative electrode side potential line 230 and the motor power line 236. The positive electrode side potential line 228 is connected to the positive electrode side power supply potential of the battery B. The negative electrode side potential line 230 is connected to the current detection circuit 216. The motor power lines 223, 234, 236 are connected to the coil 170 (see FIGS. 18 and 19) of the feed motor 32.

Similarly, the inverter circuit 214 includes switching elements 238a, 238b, 240a, 240b, 242a, 242b. The switching elements 238a, 238b, 240a, 240b, 242a, and 242b are field effect transistors, and more specifically, MOSFETs having an insulated gate. The switching element 238a connects the positive electrode side potential line 244 and the motor power line 248. The switching element 238b connects the negative electrode side potential line 246 and the motor power line 248. The switching element 240a connects the positive electrode side potential line 244 and the motor power line 250. The switching element 240b connects the negative electrode side potential line 246 and the motor power line 250. The switching element 242a connects the positive electrode side potential line 244 and the motor power line 252. The switching element 242b connects the negative electrode side potential line 246 and the motor power line 252. The positive electrode side potential line 244 is connected to the positive electrode side power supply potential of the battery B. The negative electrode side potential line 246 is connected to the current detection circuit 216. The motor power lines 248, 250, and 252 are connected to the coil 182 (see FIGS. 18 and 19) of the torsion motor 76.

The gate drive circuit 208 sets each switching element 222a, 224a, 226a, 222b, 224b, 226b of the inverter circuit 212 between conductive and non-conducting according to the motor control signals UH1, VH1, WH1, UL1, VL1, WL1. By switching, the operation of the feed motor 32 is controlled. If the gate drive circuit 208 makes all the switching elements 222a, 224a, 226a, 222b, 224b, and 226b non-conducting while the feed motor 32 is rotating, the power supply to the feed motor 32 is cut off and the feed motor 32. 32 continues to rotate due to inertia and then stops. Further, when the feed motor 32 is rotating, if the gate drive circuit 208 makes the switching elements 222a, 224a, 226a non-conducting and the switching elements 222b, 224b, 226b conductive, the feed motor 32 has a so-called short-circuit brake. The rotation of the feed motor 32 is immediately stopped. In the following, the motor control signals UH1, VH1, WH1, UL1, VL1, WL1 in which UL1, VL1 and WL1 are all H potentials (in this case, the switching elements 222b, 224b and 226b are all conductive) are short-circuited. Also called a brake signal.

Similarly, the gate drive circuit 210 conducts and does not conduct the switching elements 238a, 240a, 242a, 238b, 240b, 242b of the inverter circuit 214 according to the motor control signals UH2, VH2, WH2, UL2, VL2, WL2. The operation of the torsion motor 76 is controlled by switching between. If the gate drive circuit 210 makes all the switching elements 238a, 240a, 242a, 238b, 240b, and 242b non-conducting while the torsion motor 76 is rotating, the power supply to the torsion motor 76 is cut off and the torsion motor 76 is rotated. 76 continues to rotate due to inertia and then stops. Further, when the torsion motor 76 is rotating, if the gate drive circuit 210 makes the switching elements 238a, 240a, 242a non-conducting and the switching elements 238b, 240b, 242b conductive, the torsion motor 76 has a so-called short-circuit brake. The rotation of the twisting motor 76 is immediately stopped. In the following, the motor control signals UH2, VH2, WH2, UL2, VL2, WL2 (in this case, the switching elements 238b, 240b, 242b are all conductive) in which UL2, VL2, and WL2 are all H potentials are short-circuited. Also called a brake signal.

As shown in FIG. 20, the current detection circuit 216 is arranged between the inverter circuit 212 and the inverter circuit 214 and the negative electrode side power supply potential of the battery B. The current detection circuit 216 detects the magnitude of the current flowing through the inverter circuit 212 and the inverter circuit 214. The current detection circuit 216 outputs the detected current value to the MCU 202.

The MCU 202 includes a motor control signal output port 202a, a motor rotation signal input port 202b, and a general-purpose input / output port 202c. The motor control signal output port 202a is provided for outputting the motor control signals UH, VH, WH, UL, VL, and WL to the brushless motor, and can process signals at a higher speed than the general-purpose input / output port 202c. Is. The motor rotation signal input port 202b is provided for inputting Hall sensor signals Hu, Hv, and Hw from the brushless motor, and can process signals at a higher speed than the general-purpose input / output port 202c. The setting display LED 22a and the setting switch 22b of the display board 22, the trigger switch 9, the initial state detection sensor 136, the grip detection sensor 138, and the current detection circuit 216 are connected to the general-purpose input / output port 202c of the MCU 202.

The motor control signal output port 202a of the MCU 202 is connected to the motor control signal output destination switching circuit 204. The motor control signal output destination switching circuit 204 receives the motor control signals UH, VH, WH, UL, VL output from the motor control signal output port 202a according to the switching signal SW output from the general-purpose input / output port 202c of the MCU 202. , The output destination of WL is switched between the gate drive circuit 208 and the gate drive circuit 210.

As shown in FIG. 22, the motor control signal output destination switching circuit 204 may be configured to include a demultiplexer 260. When the switching signal SW output from the MCU 202 has an H potential, the demultiplexer 260 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 208 as the motor control signal UH1. When the switching signal SW output from the MCU 202 has an L potential, the demultiplexer 260 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 210 as the motor control signal UH2. Although only the configuration corresponding to the motor control signal UH has been described here for ease of understanding, the motor control signal output destination switching circuit 204 also includes other motor control signals VH, WH, UL, VL, and WL. It has a similar configuration.

Alternatively, as shown in FIG. 23, the motor control signal output destination switching circuit 204 may be configured to include FETs 262 and 264 and NOT gates 266. When the switching signal SW output from the MCU 202 has an H potential, the FET 262 is turned on and the FET 264 is turned off. In this case, the motor control signal output destination switching circuit 204 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 208 as the motor control signal UH1. When the switching signal SW output from the MCU 202 has an L potential, the FET 262 is turned off and the FET 264 is turned on. In this case, the motor control signal output destination switching circuit 204 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 210 as the motor control signal UH2. Although only the configuration corresponding to the motor control signal UH has been described here for ease of understanding, the motor control signal output destination switching circuit 204 also includes other motor control signals VH, WH, UL, VL, and WL. It has a similar configuration.

Alternatively, as shown in FIG. 24, the motor control signal output destination switching circuit 204 may be configured to include NOR gates 268 and 270 and NOT gates 272 and 274. When the switching signal SW output from the MCU 202 has an H potential, the NOR gate 268 outputs the motor control signal UH output from the MCU 202, and the NOR gate 270 outputs the L potential. In this case, the motor control signal output destination switching circuit 204 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 208 as the motor control signal UH1. When the switching signal SW output from the MCU 202 has an L potential, the NOR gate 268 outputs the L potential, and the NOR gate 270 outputs the motor control signal UH output from the MCU 202. In this case, the motor control signal output destination switching circuit 204 outputs the motor control signal UH output from the MCU 202 to the gate drive circuit 210 as the motor control signal UH2. Although only the configuration corresponding to the motor control signal UH has been described here for ease of understanding, the motor control signal output destination switching circuit 204 also includes other motor control signals VH, WH, UL, VL, and WL. It has a similar configuration.

As shown in FIG. 25, the brake circuit 218 is connected to the signal lines of the motor control signals UL1, VL1, WL1 output from the motor control signal output destination switching circuit 204 to the gate drive circuit 208. The brake circuit 218 applies a short-circuit brake to the feed motor 32 in response to the brake signal BR1 output from the general-purpose input / output port 202c of the MCU 202. The brake circuit 218 includes transistors 274a, 274b, 274c, 274d and resistors 276a, 276b, 276c, 276d, 276e, 276f, 276g, 276h. When the brake signal BR1 input from the MCU 202 has an L potential, the transistors 274a are turned off and the transistors 274b, 274c, and 274d are all turned off. Therefore, the gate drive circuit 208 is connected to the motor control signal output destination switching circuit 204. The output motor control signals UL1, VL1, WL1 are input as they are. When the brake signal BR1 input from the MCU 202 has an H potential, the transistors 274a are turned on and the transistors 274b, 274c, and 274d are all turned on. Therefore, the motor control signals UL1, VL1, WL1 input to the gate drive circuit 208 are turned on. Are all H potentials. In this case, a short-circuit brake signal is input to the gate drive circuit 208, and the short-circuit brake is applied to the feed motor 32.

Similarly, the brake circuit 220 is connected to the signal lines of the motor control signals UL2, VL2, and WL2 output from the motor control signal output destination switching circuit 204 to the gate drive circuit 210. The brake circuit 220 applies a short-circuit brake to the torsion motor 76 in response to the brake signal BR2 output from the general-purpose input / output port 202c of the MCU 202. The brake circuit 220 has the same configuration as the brake circuit 218. The brake circuit 220 includes transistors 278a, 278b, 278c, 278d and resistors 280a, 280b, 280c, 280d, 280e, 280f, 280g, 280h. When the brake signal BR2 input from the MCU 202 has an L potential, the transistors 278a are turned off and the transistors 278b, 278c, and 278d are all turned off. Therefore, the gate drive circuit 210 is connected to the motor control signal output destination switching circuit 204. The output motor control signals UL2, VL2, and WL2 are input as they are. When the brake signal BR2 input from the MCU 202 has an H potential, the transistors 278a are turned on and the transistors 278b, 278c, and 278d are all turned on. Therefore, the motor control signals UL2, VL2, and WL2 input to the gate drive circuit 210 are turned on. Are all H potentials. In this case, a short-circuit brake signal is input to the gate drive circuit 210, and the short-circuit brake is applied to the torsion motor 76.

As shown in FIG. 20, the hall sensor 180 of the feed motor 32 and the hall sensor 192 of the torsion motor 76 are connected to the motor rotation signal input source switching circuit 206. The motor rotation signal input source switching circuit 206 is connected to the motor rotation signal input port 202b of the MCU 202. The motor rotation signal input source switching circuit 206 receives the hall sensor signals Hu1, Hv1, Hw1 from the feed motor 32 and the hall sensor signals Hu2, Hv2, Hw2 from the torsion motor 76 according to the switching signal SW output from the MCU 202. One of the two is input to the motor rotation signal input port 202b of the MCU 202.

As shown in FIG. 26, the motor rotation signal input source switching circuit 206 may be configured to include a multiplexer 282. When the switching signal SW output from the MCU 202 has an H potential, the multiplexer 282 outputs the Hall sensor signal Hu1 from the feed motor 32 to the MCU 202 as the Hall sensor signal Hu. When the switching signal SW output from the MCU 202 has an L potential, the multiplexer 282 outputs the Hall sensor signal Hu2 from the torsion motor 76 to the MCU 202 as the Hall sensor signal Hu. Although only the configuration corresponding to the hall sensor signal Hu has been described here for ease of understanding, the motor rotation signal input source switching circuit 206 has the same configuration for other hall sensor signals Hv and Hw. There is.

Alternatively, as shown in FIG. 27, the motor rotation signal input source switching circuit 206 may be configured to include FETs 284 and 286 and NOT gates 288. When the switching signal SW output from the MCU 202 has an H potential, the FET 284 is turned on and the FET 286 is turned off. In this case, the motor rotation signal input source switching circuit 206 outputs the Hall sensor signal Hu1 from the feed motor 32 to the MCU 202 as the Hall sensor signal Hu1. When the switching signal SW output from the MCU 202 has an L potential, the FET 284 is turned off and the FET 286 is turned on. In this case, the motor rotation signal input source switching circuit 206 outputs the Hall sensor signal Hu2 from the torsion motor 76 to the MCU 202 as the Hall sensor signal Hu2. Although only the configuration corresponding to the hall sensor signal Hu has been described here for ease of understanding, the motor rotation signal input source switching circuit 206 has the same configuration for other hall sensor signals Hv and Hw. There is.

Alternatively, as shown in FIG. 28, the motor rotation signal input source switching circuit 206 may be configured to include NOR gates 290, 292, 294 and NOT gates 296. When the switching signal SW output from the MCU 202 has an H potential, the NOR gate 290 inverts the Hall sensor signal Hu1 from the feed motor 32 and outputs it, and the NOR gate 292 outputs the L potential. Therefore, the NOR gate 294 outputs the L potential. The Hall sensor signal Hu1 from the feed motor 32 is output. In this case, the motor rotation signal input source switching circuit 206 outputs the Hall sensor signal Hu1 from the feed motor 32 to the MCU 202 as the Hall sensor signal Hu1. When the switching signal SW output from the MCU 202 has an L potential, the NOR gate 290 outputs the L potential, and the NOR gate 292 inverts and outputs the Hall sensor signal Hu2 from the twisting motor 76, so that the NOR gate 294 outputs the L potential. The Hall sensor signal Hu2 from the torsion motor 76 is output. In this case, the motor rotation signal input source switching circuit 206 outputs the Hall sensor signal Hu2 from the torsion motor 76 to the MCU 202 as the Hall sensor signal Hu2. Although only the configuration corresponding to the hall sensor signal Hu has been described here for ease of understanding, the motor rotation signal input source switching circuit 206 has the same configuration for other hall sensor signals Hv and Hw. There is.

As shown in FIG. 20, the hall sensor 180 of the feed motor 32 and the hall sensor 192 of the torsion motor 76 are also connected to the general-purpose input / output port 202c of the MCU 202. The MCU 202 can monitor the Hall sensor signals Hu1, Hv1, Hw1 from the feed motor 32 and the Hall sensor signals Hu2, Hv2, Hw2 from the torsion motor 76, which are input to the general-purpose input / output port 202c.

(Advance control of feed motor 32 and torsion motor 76)
The MCU 202 is a motor control signal from the motor control signal output port 202a based on the Hall sensor signals Hu, Hv, Hw input to the motor rotation signal input port 202b when controlling the operation of the feed motor 32 and the torsion motor 76. Outputs UH, VH, WH, UL, VL, and WL. Hereinafter, the advance angle control performed by the MCU 202 when controlling the operation of the feed motor 32 and the torsion motor 76 will be described.

As a reference example, FIG. 29 shows Hall sensor signals Hu, Hv, Hw and motor control signals UH, VH, WH, UL, VL, WL when the brushless motor is rotated in the forward direction when the advance angle control is not performed. The timing chart of is shown. As a reference example, FIG. 30 shows Hall sensor signals Hu, Hv, Hw and motor control signals UH, VH, WH, UL, VL, WL when the brushless motor is rotated in the reverse direction when the advance angle control is not performed. The timing chart of is shown.

FIG. 31 is a timing chart of Hall sensor signals Hu, Hv, Hw and motor control signals UH, VH, WH, UL, VL, WL when the brushless motor is rotated forward in the reinforcing bar binding machine 2 of the present embodiment. Is shown. In the reinforcing bar binding machine 2 of the present embodiment, when the feed motor 32 and the torsion motor 76 rotate in the forward direction, the hall sensor signals Hu1, Hv1, Hw1, Hu2 are in a state where the hall sensors 180 and 192 are advanced by 25 ° in the electric angle. , Hv2, Hw2 are output, and the MCU202 outputs motor control signals UH, VH, WH, UL, VL, WL based on the Hall sensor signals Hu, Hv, Hw advanced by 25 °. Therefore, when the feed motor 32 and the torsion motor 76 rotate in the forward direction, the advance angle control of 25 ° is performed.

FIG. 32 is a timing chart of the Hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL, VL, WL when the brushless motor is rotated in the reverse direction in the reinforcing bar binding machine 2 of the present embodiment. Is shown. In the reinforcing bar binding machine 2 of the present embodiment, when the feed motor 32 and the torsion motor 76 are rotated in the reverse direction, the hall sensor signals Hu1, Hv1, Hw1, Hu2 are in a state where the hall sensors 180 and 192 are delayed by 25 ° in the electric angle. , Hv2, Hw2 are output, but the MCU202 outputs the output patterns of the motor control signals UH, VH, WH, UL, VL, and WL one step ahead (corresponding to 60 ° in electrical angle). Therefore, the MCU 202 outputs the motor control signals UH, VH, WH, UL, VL, and WL at an advance angle of 60 ° -25 ° = 35 °. That is, the advance angle control of 35 ° is performed for the reverse rotation of the feed motor 32 and the torsion motor 76.

As described above, in the reinforcing bar binding machine 2 of the present embodiment, the advance angle (for example, 35 °) at the time of reverse rotation is set as compared with the advance angle (for example, 25 °) at the time of forward rotation of the feed motor 32 and the torsion motor 76. It is set large. The advantages of this configuration will be described below.

FIG. 33 shows the relationship between the torque of a general brushless motor, the rotation speed, and the advance angle in the advance angle control. As shown in FIG. 33, the larger the torque, the smaller the rotation speed. Further, as shown in FIG. 33, when the torque is small, the larger the advance angle in the advance angle control, the larger the rotation speed, and when the torque is large, the larger the advance angle in the advance angle control, the smaller the rotation speed. Become.

FIG. 34 shows the relationship between the torque and current of a general brushless motor and the advance angle in advance angle control. As shown in FIG. 34, the larger the torque, the larger the current. Further, as shown in FIG. 34, the larger the advance angle in the advance angle control, the larger the current.

In the reinforcing bar binding machine 2 of the present embodiment, when the feed motor 32 is rotated in the reverse direction, that is, when the wire W is fed, a large torque does not act on the feed motor 32. In this case, by increasing the advance angle in the advance angle control, the rotation speed can be increased and the time required for the feeding process can be shortened. Although the current increases when the advance angle in the advance angle control is increased, the heat generated by the feed motor 32 and the inverter circuit 212 does not become a problem because the current of the feed motor 32 is originally small in the feeding process.

On the contrary, when the feed motor 32 is rotated in the forward direction, that is, when the wire W is pulled back, a large torque acts on the feed motor 32. In this case, by reducing the advance angle in the advance angle control, the rotation speed can be increased and the time required for the pullback process can be shortened. Further, by reducing the advance angle in the advance angle control, the current flowing through the feed motor 32 can be reduced, and excessive heat generation of the feed motor 32 and the inverter circuit 212 can be suppressed.

In this embodiment, regarding the feed motor 32, the advance angle in the advance angle control during forward rotation is set to 25 °, and the advance angle in advance angle control during reverse rotation is set to 35 °. As a result, it is possible to reduce the time in the delivery process while reducing the time and current in the pull-back process. The advance angle in the advance angle control during forward rotation and reverse rotation is not limited to the above numerical values. For example, the advance angle in advance angle control during forward rotation is set to 20 °, and the advance angle during reverse rotation is set to 20 °. The advance angle in the advance angle control may be 40 °.

In the reinforcing bar binding machine 2 of this embodiment, when the twisting motor 76 is rotated in the forward direction, that is, when the wire W is twisted, a large torque acts on the twisting motor 76. In this case, by reducing the advance angle in the advance angle control, the rotation speed can be increased and the time required for the twisting process can be shortened. Further, by reducing the advance angle in the advance angle control, the current flowing through the torsion motor 76 can be reduced, and excessive heat generation of the torsion motor 76 and the inverter circuit 214 can be suppressed.

On the contrary, when the torsion motor 76 is rotated in the reverse direction, that is, when the torsion mechanism 30 is returned to the initial state, a large torque does not act on the torsion motor 76. In this case, by increasing the advance angle in the advance angle control, the rotation speed can be increased and the time required for the initial state return step can be shortened. Although the current increases when the advance angle in the advance angle control is increased, the current of the torsion motor 76 is originally small in the initial state return step, so that the heat generation of the torsion motor 76 and the inverter circuit 214 does not become a problem.

In this embodiment, regarding the torsion motor 76, the advance angle in the advance angle control during forward rotation is set to 25 °, and the advance angle in advance angle control during reverse rotation is set to 35 °. As a result, it is possible to reduce the time in the twisting process and reduce the current, and at the same time, reduce the time in the initial state return process. The advance angle in the advance angle control during forward rotation and reverse rotation is not limited to the above numerical values. For example, the advance angle in forward rotation is 20 ° and the advance angle in reverse rotation is 40 °. May be good.

In the above embodiment, when the feed motor 32 and the torsion motor 76 rotate in the forward direction, the hall sensor signals Hu1, Hv1, Hw1, Hu2, Hv2 are in a state where the hall sensors 180 and 192 are advanced by 25 ° in the electric angle. , Hw2 is output, and when the feed motor 32 and the torsion motor 76 rotate in the reverse direction, the hall sensor signals Hu1, Hv1, Hw1, Hu2, Hv2, Hw2 with the hall sensors 180 and 192 delayed by 25 ° in the electrical angle. Hall sensors 180 and 192 are arranged on the sensor boards 178 and 190 so as to output. Unlike this, the Hall sensor signals Hu1, Hv1, Hw1, Hu2, Hv2, and Hw2 from the Hall sensors 180 and 192 adjust the advance and retard angles with respect to the forward and reverse rotations of the feed motor 32 and the torsion motor 76. Hall sensors 180 and 192 are arranged on the sensor boards 178 and 190 so as not to be present, and the motor control signals UH, at a desired advance angle with respect to the hall sensor signals Hu, Hv, Hw by processing in the MCU 202, VH, WH, UL, VL, WL may be output. In this case, the MCU 202 measures the time required for the electric angle to advance by 60 ° from the Hall sensor signals Hu, Hv, and Hw, and from the measured time, the time corresponding to the electric angle of 25 ° and the electric angle of 35 ° are set. The corresponding times are calculated, and the timings at which the motor control signals UH, VH, WH, UL, VL, and WL are output are changed in the forward rotation and the reverse rotation, respectively. FIG. 35 shows the Hall sensor signals Hu, Hv, Hw and the motor control signals UH, VH, WH, UL when the advance angle is controlled at 25 ° when the brushless motor is rotated forward by such a method. , VL, WL timing chart is shown. FIG. 36 shows Hall sensor signals Hu, Hv, Hw and motor control signals UH, VH, WH, UL when the advance angle is controlled at 35 ° when the brushless motor is rotated in the reverse direction by such a method. , VL, WL timing chart is shown. When such a method is used, it is necessary to recalculate the time corresponding to the electric angle of 25 ° and the electric angle of 35 ° each time the rotation speed of the feed motor 32 or the torsion motor 76 changes. As in the above embodiment, the feed motor 32 and the torsion motor 76 are configured to set the advance angle in the advance angle control during forward rotation and reverse rotation by arranging the Hall sensors 180 and 192 on the sensor boards 178 and 190. Even when the number of rotations of the above changes, it is possible to control the advance angle at a desired advance angle during forward rotation and reverse rotation without performing special processing in the MCU 202.

(Processing executed by MCU202)
The MCU 202 executes the process of FIG. 37 when the trigger switch 9 is switched from off to on. In the process of FIG. 37, the MCU 202 has a feed motor first drive process of S2 (see FIG. 38), a torsion motor first drive process of S4 (see FIG. 39), and a feed motor second drive process of S6 (see FIG. 40). , The twist motor second drive process of S8 (see FIG. 41) and the twist motor third drive process of S10 (see FIG. 42) are executed in this order.

(Feed motor first drive processing)
Hereinafter, the details of the feed motor first drive process will be described with reference to FIG. 38. In S12, the MCU 202 outputs the H potential as the switching signal SW, and switches the motor control signal output destination switching circuit 204 and the motor rotation signal input source switching circuit 206 to the feed motor 32 side, respectively.

In S14, the MCU 202 outputs the motor control signals UH, VH, WH, UL, VL, and WL so as to rotate the feed motor 32 in the reverse direction. As a result, the feed motor 32 rotates in the reverse direction, and the feed process of feeding the wire W is started.

In S16, the MCU 202 waits until the feed amount of the wire W reaches a predetermined value. The amount of wire W sent out can be calculated, for example, by counting the Hall sensor signals Hu, Hv, and Hw. It can be calculated based on the elapsed time from the start of driving the feed motor 32 in S14. When the delivery amount of the wire W reaches a predetermined value (YES), the process proceeds to S18.

In S18, the MCU 202 outputs a short-circuit brake signal as motor control signals UH, VH, WH, UL, VL, and WL so as to stop the feed motor 32. As a result, the feed motor 32 is braked.

In S20, the MCU 202 outputs the H potential as the brake signal BR1. As a result, the brake circuit 218 maintains the motor control signals UL1, VL1 and WL1 at the H potential. If the brake circuit 218 maintains the motor control signals UL1, VL1 and WL1 at the H potential before the MCU 202 outputs the short-circuit brake signal in S18, a current flows from the brake circuit 218 to the motor control signal output port 202a of the MCU 202. There is a risk. As in this embodiment, after the MCU202 outputs a short-circuit brake signal in S18, the brake circuit 218 maintains the motor control signals UL1, VL1, WL1 at the H potential, so that the motors of the brake circuits 218 to the MCU202 It is possible to prevent the current from flowing into the control signal output port 202a. After the process of S20, the process of FIG. 38 ends.

(Twisting motor first drive processing)
Hereinafter, the details of the first driving process of the torsion motor will be described with reference to FIG. 39. In S22, the MCU 202 outputs the L potential as the switching signal SW, and switches the motor control signal output destination switching circuit 204 and the motor rotation signal input source switching circuit 206 to the torsion motor 76 side, respectively. Since the brake circuit 218 maintains the motor control signals UL1, VL1 and WL1 at the H potential at the time of executing the process of S22, the motor control signal output destination switching circuit 204 is switched to the torsion motor 76 side. Even if the short-circuit brake signal from the MCU 202 is no longer output to the feed motor 32 side, the brake on the feed motor 32 is maintained.

In S24, the MCU 202 outputs motor control signals UH, VH, WH, UL, VL, and WL so as to rotate the torsion motor 76 in the forward direction. As a result, the torsion motor 76 rotates in the forward direction, and the tip holding step of holding the tip of the wire W is started.

In S26, the MCU 202 waits until the stop determination period starts. The stop determination period is a period in which it is assumed that the feed motor 32 has already stopped after the feed motor 32 is braked. The MCU 202 determines that the stop determination period has started, for example, when the elapsed time from the start of braking the feed motor 32 in S18 of FIG. 38 reaches a predetermined time. When the stop determination period starts (YES), the process proceeds to S28.

In S28, the MCU 202 determines whether or not there is a change in the Hall sensor signals Hu1, Hv1, Hw1 from the feed motor 32 monitored by the general-purpose input / output port 202c. If there is a change in the Hall sensor signals Hu1, Hv1, Hw1 (yes), the process proceeds to S30. In S30, the MCU 202 determines that an error has occurred and executes error processing. If there is no change in the Hall sensor signals Hu1, Hv1, Hw1 (NO), the process proceeds to S32.

In S32, the MCU 202 determines whether or not the suspension determination period has expired. The MCU202 determines that the stop determination period has ended, for example, when the elapsed time from the start of the stop determination period in S26 reaches a predetermined time. If the stop determination period has not ended (NO), the process returns to S28. When the stop determination period ends (YES), the process proceeds to S34.

In S34, the MCU 202 outputs the L potential as the brake signal BR1. As a result, the maintenance of the motor control signals UL1, VL1 and WL1 to the H potential by the brake circuit 218 is released.

In S36, the MCU 202 waits until the tip of the wire W is held. Whether or not the tip of the wire W is held can be determined based on the detection signal of the grip detection sensor 138. When the tip of the wire W is held (YES), the process proceeds to S38.

In S38, the MCU 202 outputs a short-circuit brake signal as motor control signals UH, VH, WH, UL, VL, and WL so as to stop the torsion motor 76. As a result, the torsion motor 76 is braked.

In S40, the MCU 202 outputs the H potential as the brake signal BR2. As a result, the brake circuit 220 maintains the motor control signals UL2, VL2, and WL2 at the H potential. As in this embodiment, after the MCU 202 outputs a short-circuit brake signal in S38, the brake circuit 220 maintains the motor control signals UL2, VL2, and WL2 at the H potential, so that the motors from the brake circuit 220 to the MCU202 It is possible to prevent the current from flowing into the control signal output port 202a. After the processing of S40, the processing of FIG. 39 ends.

(Feed motor second drive processing)
Hereinafter, the details of the feed motor second drive process will be described with reference to FIG. 40. In S42, the MCU 202 outputs the H potential as the switching signal SW, and switches the motor control signal output destination switching circuit 204 and the motor rotation signal input source switching circuit 206 to the feed motor 32 side. Since the brake circuit 220 maintains the motor control signals UL2, VL2, and WL2 at the H potential at the time of executing the process of S42, the motor control signal output destination switching circuit 204 is switched to the feed motor 32 side. Even if the short-circuit brake signal from the MCU 202 is no longer output to the torsion motor 76 side, the braking for the torsion motor 76 is maintained.

In S44, the MCU 202 outputs the motor control signals UH, VH, WH, UL, VL, and WL so as to rotate the feed motor 32 in the forward direction. As a result, the feed motor 32 rotates in the forward direction, and the pull-back process of pulling back the wire W is started.

In S46, the MCU 202 waits until the stop determination period starts. The MCU 202 determines that the stop determination period has started, for example, when the elapsed time from the start of braking the torsion motor 76 in S38 of FIG. 39 reaches a predetermined time. When the stop determination period starts (YES), the process proceeds to S48.

In S48, the MCU 202 determines whether or not there is a change in the Hall sensor signals Hu2, Hv2, and Hw2 from the torsion motor 76 monitored by the general-purpose input / output port 202c. If there is a change in the Hall sensor signals Hu2, Hv2, Hw2 (YES), the process proceeds to S50. In S50, the MCU 202 determines that an error has occurred and executes error processing. If there is no change in the Hall sensor signals Hu2, Hv2, Hw2 (NO), the process proceeds to S52.

In S52, the MCU 202 determines whether or not the suspension determination period has expired. The MCU202 determines that the stop determination period has ended, for example, when the elapsed time from the start of the stop determination period in S46 reaches a predetermined time. If the stop determination period has not ended (NO), the process returns to S48. When the stop determination period ends (YES), the process proceeds to S54.

In S54, the MCU 202 outputs the L potential as the brake signal BR2. As a result, the maintenance of the motor control signals UL2, VL2, and WL2 to the H potential by the brake circuit 220 is released.

In S56, the MCU 202 waits until the pulling back of the wire W is completed. For example, the MCU 202 determines that the pulling back of the wire W is completed when the current value detected by the current detection circuit 216 becomes equal to or higher than a predetermined value. When the pulling back of the wire W is completed (YES), the process proceeds to S58.

In S58, the MCU 202 outputs a short-circuit brake signal as motor control signals UH, VH, WH, UL, VL, and WL so as to stop the feed motor 32. As a result, the feed motor 32 is braked.

In S60, the MCU 202 outputs the H potential as the brake signal BR1. As a result, the brake circuit 218 maintains the motor control signals UL1, VL1 and WL1 at the H potential. After the processing of S60, the processing of FIG. 40 ends.

(Twisting motor second drive processing)
Hereinafter, the details of the second drive processing of the torsion motor will be described with reference to FIG. 41. In S62, the MCU 202 outputs the L potential as the switching signal SW, and switches the motor control signal output destination switching circuit 204 and the motor rotation signal input source switching circuit 206 to the torsion motor 76 side. Since the brake circuit 218 maintains the motor control signals UL1, VL1 and WL1 at the H potential at the time of executing the process of S62, the motor control signal output destination switching circuit 204 is switched to the torsion motor 76 side. Even if the short-circuit brake signal from the MCU 202 is no longer output to the feed motor 32 side, the brake on the feed motor 32 is maintained.

In S64, the MCU 202 outputs motor control signals UH, VH, WH, UL, VL, and WL so as to rotate the torsion motor 76 in the forward direction. As a result, the twisting motor 76 rotates in the forward direction, and the rear end holding step of holding the rear end of the wire W, the cutting step of cutting the wire W, the pulling step of pulling the wire W, and the twisting step of twisting the wire W are performed. It will be executed in order.

In S66, the MCU 202 waits until the stop determination period starts. The MCU 202 determines that the stop determination period has started, for example, when the elapsed time from the start of braking the feed motor 32 in S58 of FIG. 40 reaches a predetermined time. When the stop determination period starts (YES), the process proceeds to S68.

In S68, the MCU 202 determines whether or not there is a change in the Hall sensor signals Hu1, Hv1, Hw1 from the feed motor 32 monitored by the general-purpose input / output port 202c. If there is a change in the Hall sensor signals Hu1, Hv1, Hw1 (yes), the process proceeds to S70. In S70, the MCU 202 determines that an error has occurred and executes error processing. If there is no change in the Hall sensor signals Hu1, Hv1, Hw1 (NO), the process proceeds to S72.

In S72, the MCU 202 determines whether or not the suspension determination period has expired. The MCU202 determines that the stop determination period has ended, for example, when the elapsed time from the start of the stop determination period in S66 reaches a predetermined time. If the stop determination period has not ended (NO), the process returns to S68. When the stop determination period ends (YES), the process proceeds to S74.

In S74, the MCU 202 outputs the L potential as the brake signal BR1. As a result, the maintenance of the motor control signals UL1, VL1, WL1 to the H potential by the brake circuit 218 is released.

In S76, the MCU 202 waits until the twisting of the wire W is completed. For example, the MCU 202 determines that the twisting of the wire W is completed when the current value detected by the current detection circuit 216 is equal to or greater than the current value corresponding to the set value of the binding force of the wire W. When the twisting of the wire W is completed (YES), the process proceeds to S78.

In S78, the MCU 202 outputs a short-circuit brake signal as motor control signals UH, VH, WH, UL, VL, and WL so as to stop the torsion motor 76. As a result, the torsion motor 76 is braked.

In S80, the MCU 202 waits until the torsion motor 76 stops. Whether or not the torsion motor 76 has stopped can be determined based on the Hall sensor signals Hu2, Hv2, and Hw2 from the torsion motor 76 input to the motor rotation signal input port 202b. When the torsion motor 76 is stopped (YES), the process of FIG. 41 ends.

(Twisting motor 3rd drive processing)
Hereinafter, the details of the torsion motor third drive process will be described with reference to FIG. 42.

In S82, the MCU 202 outputs motor control signals UH, VH, WH, UL, VL, and WL so as to rotate the torsion motor 76 in the reverse direction. As a result, the twisting motor 76 rotates in the reverse direction, and the initial state returning step of returning the twisting mechanism 30 to the initial state is started.

In S84, the MCU 202 waits until the twisting mechanism 30 returns to the initial state. Whether or not the twisting mechanism 30 has returned to the initial state can be determined based on the detection signal of the initial state detection sensor 136. When the twisting mechanism 30 returns to the initial state (YES), the process proceeds to S86.

In S86, the MCU 202 outputs a short-circuit brake signal as motor control signals UH, VH, WH, UL, VL, and WL so as to stop the torsion motor 76. As a result, the torsion motor 76 is braked.

In S88, the MCU 202 waits until the torsion motor 76 stops. Whether or not the torsion motor 76 has stopped can be determined based on the Hall sensor signals Hu2, Hv2, and Hw2 from the torsion motor 76 input to the motor rotation signal input port 202b. When the torsion motor 76 is stopped (YES), the process of FIG. 42 ends.

FIG. 43 shows the operation of the feed motor 32 and the torsion motor 76 in the series of processes of FIGS. 37-42. In the above process, in the first drive process of the feed motor, after the brake is started to be applied to the feed motor 32 and before the feed motor 32 is completely stopped, the forward rotation of the torsion motor 76 is performed in the first drive process of the torsion motor. To start. As a result, the time required to bind the reinforcing bars R with the wire W can be shortened as compared with the case where the forward rotation of the torsion motor 76 is started after the feed motor 32 is completely stopped. Further, in the above process, in the first drive process of the torsion motor, after the brake is started on the torsion motor 76 and before the torsion motor 76 is completely stopped, in the second drive process of the feed motor, the feed motor 32 Start forward rotation. As a result, the time required to bind the reinforcing bars R with the wire W can be shortened as compared with the case where the forward rotation of the feed motor 32 is started after the twisting motor 76 is completely stopped. Further, in the above process, in the second drive process of the feed motor, after the brake is started to be applied to the feed motor 32 and before the feed motor 32 is completely stopped, in the second drive process of the twist motor, the torsion motor 76 Start forward rotation. As a result, the time required to bind the reinforcing bars R with the wire W can be shortened as compared with the case where the forward rotation of the torsion motor 76 is started after the feed motor 32 is completely stopped.

As described above, in one or more embodiments, the reinforcing bar binding machine 2 has a feed motor 32 (an example of a first brushless motor), a feed mechanism 24 for feeding the wire W, and a torsion motor 76. (Example of a second brushless motor), a twisting mechanism 30 for twisting a wire W, an MCU 202 (an example of a control unit) for controlling a feed motor 32 and a twisting motor 76, and a motor rotation signal input source switching circuit 206. It has. The feed motor 32 includes a Hall sensor 180 (an example of the first Hall sensor). The torsion motor 76 includes a Hall sensor 192 (an example of a second Hall sensor). The MCU 202 includes a general-purpose input / output port 202c and a motor rotation signal input port 202b. The motor rotation signal input source switching circuit 206 motorizes one of the first Hall sensor signals Hu1, Hv1, Hw1 from the Hall sensor 180 and the second Hall sensor signals Hu2, Hv2, Hw2 from the Hall sensor 192. Input to the rotation signal input port 202b. The motor rotation signal input source switching circuit 206 sets one of the first hall sensor signals Hu1, Hv1, Hw1 and the second hall sensor signals Hu2, Hv2, Hw2 according to the switching signal SW (example of input switching signal). select.

According to the above configuration, the first hole sensor signals Hu1, Hv1, Hw1 of the feed motor 32 and the second hole sensor signals Hu2, Hv2 of the torsion motor 76 are connected to the motor rotation signal input port 202b corresponding to one brushless motor. , Hw2 can be selectively input. With such a configuration, both the feed motor 32 of the feed mechanism 24 and the twist motor 76 of the twist mechanism 30 can be accurately controlled without causing a significant increase in cost.

In one or more embodiments, the switching signal SW is output from the general purpose input / output port 202c of the MCU 202.

According to the above configuration, the motor rotation signal input source switching circuit 206 can be switched according to the timing of the processing performed by the MCU 202.

In one or more embodiments, the motor rotation signal input source switching circuit 206 comprises a multiplexer 282.

According to the above configuration, the motor rotation signal input source switching circuit 206 can be realized by a simple configuration.

In one or more embodiments, the first Hall sensor signals Hu1, Hv1, Hw1 are also input to the general purpose input / output ports 202c of the MCU 202. The second hall sensor signals Hu2, Hv2, and Hw2 are also input to the general-purpose input / output port 202c of the MCU 202.

According to the above configuration, of the first hall sensor signals Hu1, Hv1, Hw1 and the second hall sensor signals Hu2, Hv2, Hw2, whichever is not selected by the motor rotation signal input source switching circuit 206 is also used in the MCU 202. Can be monitored.

In one or more embodiments, the MCU 202 has the motor rotation signal input source switching circuit 206 selected one of the first hall sensor signals Hu1, Hv1, Hw1 and the second hall sensor signals Hu2, Hv2, Hw2. There is a change in one of the first Hall sensor signals Hu1, Hv1, Hw1 and the second Hall sensor signals Hu2, Hv2, Hw2 after a predetermined time has elapsed from the time when the other is switched from the state to the selected state. When it is detected, it is determined that an error has occurred.

For example, when the motor rotation signal input source switching circuit 206 switches from the state in which the first hall sensor signals Hu1, Hv1, Hw1 are selected to the state in which the second hall sensor signals Hu2, Hv2, Hw2 are selected, then the MCU202 is selected. Does not control the feed motor 32, so it is considered that the feed motor 32 is stopped after a predetermined time has elapsed. When the feed motor 32 is stopped, the first Hall sensor signals Hu1, Hv1, Hw1 should not change, and if there is a change in the first Hall sensor signals Hu1, Hv1, Hw1, some abnormality will occur. It is thought that it has occurred. According to the above configuration, the occurrence of such an abnormality can be quickly detected.

In one or more embodiments, the rebar binding machine 2 further comprises a motor control signal output destination switching circuit 204. The MCU 202 further includes a motor control signal output port 202a. The motor control signal output destination switching circuit 204 outputs the motor control signals UH, VH, WH, UL, VL, and WL from the MCU 202 to one of the feed motor 32 and the torsion motor 76. The motor control signal output destination switching circuit 204 selects one of the feed motor 32 and the torsion motor 76 according to the switching signal SW (example of the output switching signal).

According to the above configuration, the motor control signals UH, VH, WH, UL, VL, and WL are selectively output to the feed motor 32 and the torsion motor 76 from the motor control signal output port 202a corresponding to one brushless motor. be able to. With such a configuration, both the feed motor 32 of the feed mechanism 24 and the twist motor 76 of the twist mechanism 30 can be accurately controlled without causing a significant increase in cost.

In one or more embodiments, the motor rotation signal input source switching circuit 206 and the motor control signal output destination switching circuit 204 are switched according to the same switching signal SW.

According to the above configuration, the motor rotation signal input source switching circuit 206 and the motor control signal output destination switching circuit 204 are switched by a common signal, so that the circuit configuration can be simplified.

In one or more embodiments, the reinforced tying machine 2 (example of an electric working machine) includes a feed motor 32 (an example of a first brushless motor), a torsion motor 76 (an example of a second brushless motor), and a feed. It includes an MCU 202 (an example of a control unit) that controls a motor 32 and a torsion motor 76, and a motor rotation signal input source switching circuit 206. The feed motor 32 includes a Hall sensor 180 (an example of the first Hall sensor). The torsion motor 76 includes a Hall sensor 192 (an example of a second Hall sensor). The MCU 202 includes a general-purpose input / output port 202c and a motor rotation signal input port 202b. The motor rotation signal input source switching circuit 206 motorizes one of the first Hall sensor signals Hu1, Hv1, Hw1 from the Hall sensor 180 and the second Hall sensor signals Hu2, Hv2, Hw2 from the Hall sensor 192. Input to the rotation signal input port 202b. The motor rotation signal input source switching circuit 206 sets one of the first hall sensor signals Hu1, Hv1, Hw1 and the second hall sensor signals Hu2, Hv2, Hw2 according to the switching signal SW (example of input switching signal). select.

According to the above configuration, the first hole sensor signals Hu1, Hv1, Hw1 of the feed motor 32 and the second hole sensor signals Hu2, Hv2 of the torsion motor 76 are connected to the motor rotation signal input port 202b corresponding to one brushless motor. , Hw2 can be selectively input. With such a configuration, both the feed motor 32 and the torsion motor 76 can be controlled with high accuracy without causing a significant increase in cost.

2: Reinforcing bar binding machine 4: Main body 6: Grip 8: Trigger 9: Trigger switch 10: Battery mounting part 12: Reel holder 12a: Accommodation space 12b: Display part 12c: Operation part 14: Holder housing 14a: Rotating shaft 16: Cover member 18: Reel 20: Control board 22: Display board 22a: Setting display LED
22b: Setting switch 24: Feed mechanism 26: Guide mechanism 28: Cutting mechanism 30: Twisting mechanism 32: Feed motor 34: Deceleration part 36: Feed part 38: Base member 40: Guide member 40a: Guide hole 42: Drive gear 44: 1st gear 44a: Groove 46: 2nd gear 46a: Groove 48: Gear support member 48a: Swing shaft 52: Biasing member 56: Wire guide 56a: Projection 58: Upper guide arm 58a: Upper guide passage 60: Lower Side guide arm 60a: Lower guide passage 61: First guide pin 62: Second guide pin 66: Cutting member 66a: Rotating shaft 68: Link portion 70: Connecting member 72: Operated member 72a: Rotating shaft 72b: Projection piece 74: Biasing member 76: Twisting motor 78: Deceleration part 82: Holding part 84: Screw shaft 84a: Large diameter part 84b: Small diameter part 84c: Ball groove 84d: Engagement groove 86: Clamp guide 86a: Recession 86b : Engagement pin 86c: Stepped portion 88: Sleeve 90: Holding member 92: Biasing member 94: Ball 96: Washer 100: Inner sleeve 100a: Rib 102: Outer sleeve 102a: Stepped portion 104: Support member 106: Set screw 110 : Guide pin 114: Upper holding member 116: Lower holding member 118: Upper base 118a: Upper guide hole 120: First upper protrusion 121: Upper connecting portion 122: Second upper protrusion 123: First retaining portion 124 : First wire passage 126: Lower base 126a: Lower guide hole 128: First lower protrusion 129: Lower connecting portion 130: Second lower protrusion 131: Second retaining portion 132: Second wire Passage 134: Auxiliary passage 136: Initial state detection sensor 138: Grip detection sensor 140: Push plate 140a: Initial state detection magnet 140b: Grip detection magnet 144: Fins 146: Short fins 148: Long fins 150: Rotation limiting part 152: Base Member 154: Upper stopper 154a: Regulatory piece 156: Lower stopper 156a: Regulatory piece 158: Swinging shaft 160: Swinging shaft 162: Biasing member 164: Biasing member 170: Coil 172: Teeth 174: Stator 176: Rotor 178: Sensor substrate 180: Hall sensor 180a: First hole element 180b: Second hole element 180c: Third hole element 182: Coil 184: Tee Mouse 186: Stator 188: Rotor 190: Sensor board 192: Hall sensor 192a: First Hall element 192b: Second Hall element 192c: Third Hall element 200: Control power supply circuit 202: MCU
202a: Motor control signal output port 202b: Motor rotation signal input port 202c: General-purpose input / output port 204: Motor control signal output destination switching circuit 206: Motor rotation signal input source switching circuit 208: Gate drive circuit 210: Gate drive circuit 212: Inverter circuit 214: Inverter circuit 216: Current detection circuit 218: Brake circuit 220: Brake circuit 222a: Switching element 222b: Switching element 224a: Switching element 224b: Switching element 226a: Switching element 226b: Switching element 228: Positive potential line 230 : Negative side potential line 232: Motor power line 234: Motor power line 236: Motor power line 238a: Switching element 238b: Switching element 240a: Switching element 240b: Switching element 242a: Switching element 242b: Switching element 244: Positive side potential line 246: Negative Side potential line 248: Motor power line 250: Motor power line 252: Motor power line 260: Demultiplexer 262: FET
264: FET
266: NOT gate 268: NOR gate 270: NOR gate 272: NOT gate 274: NOT gate 274a: Transistor 274b: Transistor 274c: Transistor 274d: Transistor 276a: Resistor 276b: Resistor 276c: Resistor 276d: Resistor 276e: Resistor 276f: Resistor 276g: Resistor 276h: Resistor 278a: Transistor 278b: Transistor 278c: Transistor 278d: Transistor 280a: Resistor 280b: Resistor 280c: Resistor 280d: Resistor 280e: Resistor 280f: Resistor 280g: Resistor 280h: Resistor 282: multiplexer 284: FET
286: FET
288: NOR gate 290: NOR gate 292: NOR gate 294: NOR gate 296: NOR gate

Claims (8)

It ’s a rebar binding machine,
It has a first brushless motor, a feeding mechanism that feeds wires, and
It has a second brushless motor, a twisting mechanism that twists the wire, and
A control unit that controls the first brushless motor and the second brushless motor,
Equipped with a motor rotation signal input source switching circuit,
The first brushless motor includes a first hole sensor.
The second brushless motor includes a second hole sensor.
The control unit includes a general-purpose input / output port and a motor rotation signal input port.
The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. type in,
The motor rotation signal input source switching circuit is a reinforcing bar binding machine that selects one of the first hall sensor signal and the second hall sensor signal according to the input switching signal. The reinforcing bar binding machine according to claim 1, wherein the input switching signal is output from the general-purpose input / output port of the control unit. The reinforcing bar binding machine according to claim 1 or 2, wherein the motor rotation signal input source switching circuit includes a multiplexer. The first hall sensor signal is also input to the general-purpose input / output port of the control unit.
The reinforcing bar binding machine according to any one of claims 1 to 3, wherein the second hall sensor signal is also input to the general-purpose input / output port of the control unit. The control unit has a predetermined time from the time when the motor rotation signal input source switching circuit switches from the state in which one of the first hall sensor signal and the second hall sensor signal is selected to the state in which the other is selected. The reinforcing bar tying machine according to claim 4, wherein it is determined that an error has occurred when it is detected that there is a change in one of the first hall sensor signal and the second hall sensor signal after the lapse of time. It also has a motor control signal output destination switching circuit.
The control unit further includes a motor control signal output port.
The motor control signal output destination switching circuit outputs a motor control signal from the control unit to one of the first brushless motor and the second brushless motor.
The reinforcing bar binding machine according to any one of claims 1 to 5, wherein the motor control signal output destination switching circuit selects one of the first brushless motor and the second brushless motor according to the output switching signal. .. The reinforcing bar binding machine according to claim 6, wherein the input switching signal and the output switching signal are the same signal. It ’s an electric work machine,
With the first brushless motor,
With the second brushless motor,
A control unit that controls the first brushless motor and the second brushless motor,
Equipped with a motor rotation signal input source switching circuit,
The first brushless motor includes a first hole sensor.
The second brushless motor includes a second hole sensor.
The control unit includes a general-purpose input / output port and a motor rotation signal input port.
The motor rotation signal input source switching circuit uses a selected one of the first hall sensor signal from the first hall sensor and the second hall sensor signal from the second hall sensor as the motor rotation signal input port. type in,
The motor rotation signal input source switching circuit is an electric work machine that selects one of the first hall sensor signal and the second hall sensor signal according to the input switching signal.

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