TW201825244A - Torque value setting system, torque value setting apparatus, and torque value setting method - Google Patents

Abstract

A torque value setting system includes: a tightening tool configured to be able to measure that a tightening torque for tightening a tightening member is a predetermined tightening torque value; and a torque value setting apparatus configured to set the tightening torque value in the tightening tool. The tightening tool includes a torque value setting part configured to be able to set the tightening torque value to any value. The torque value setting apparatus includes a connection part configured to connect to the torque value setting part, a drive part configured to drive the connection part, and a controller configured to control the drive part to set the tightening torque value in the torque value setting part.

Description

Torque value setting system, torque value setting device, and torque value setting method

The present invention relates to a torque value setting system, a torque value setting device, and a torque value setting method.

The torque wrench is known as a locking tool capable of managing the tightening torque by measuring the tightening torque when the locking members such as bolts and nuts are locked to the locking points. Usually, among the torque wrenches, there is a single-function type torque wrench that cannot change the value of the locking torque to be tested, and a preset type torque wrench that can change the value of the measurable locking torque by the operation of the operator. .

In the mechanical preset type torque wrench, when the locking member is locked, once the tightening torque reaches the set value, the compressive force from the spring acts on the direction in which the toggle lever rotates around the connecting portion. The toggle lever rotates around the connecting portion to slide relative to the head. In a torque wrench, the torque wrench produces sound and vibration when the toggle slides relative to the head and contacts the rest of the casing. The operator can confirm that the locking torque value of the locking member is equal to or greater than the set value by the sound or vibration generated by the torque wrench.

In the preset torque wrench, when managing the tightening torque, the set torque setting value of each locking point must be set appropriately.

In the locking torque management technique using the torque wrench locking point, a technique of transmitting a set value of a locking torque specifying a locking point from a computer to a torque wrench is disclosed (for example, refer to Patent Document 1). In this technique, the operator adjusts the tightening torque of the torque wrench to a set value range according to the set value sent to the torque wrench, and then locks the locking member.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2013-151043

However, in the torque wrench of Patent Document 1, the setting of the tightening torque must be manually operated by an operator or the like.

In the locking operation, in order to improve the traceability, that is, to track the locking torque of the locking member to an appropriate value, it is necessary to set an appropriate locking torque for the torque wrench. In addition, in order to improve the traceability of the locking work, it is also required that the set locking torque is not easily changed.

Further, in order to maintain the measurement accuracy of the mechanical preset type torque wrench, it is desirable to unload the compression force applied to the spring at the time of storage (for example, to the origin position of the setting range of the lock torque value).

However, in the conventional mechanical preset type torque wrench, the setting of the tightening torque must be performed by an operator or the like. That is to say, for the conventional preset type torque wrench, the operator must set the tightening torque value to the origin position.

It is an object of the invention to improve the traceability of the locking operation of the locking member. Further, another object of the present invention is to maintain the measurement accuracy of the mechanical preset type torque wrench.

The present invention provides a torque value setting system including: a locking tool that measures a locking torque when a locking member is locked is a predetermined locking torque value; and a torque value setting device, For setting a locking torque value in the locking tool, the locking tool has a torque value setting portion, which can set the locking torque value to an arbitrary value, and the torque value setting device has a connecting portion and a connecting torque thereof a value setting unit; a driving unit that drives the connection unit; and a control board that controls the driving unit to set the locking torque value in the torque value setting unit.

In the present invention, the control board may calibrate the origin position of the torque value setting portion of the lock tool and the origin position of the drive unit before setting the lock torque value.

Further, the torque value setting unit may set the lock torque value by a rotation operation, and the drive unit is a motor for rotating the torque value setting unit, and the connection portion is an engagement portion, which is disposed at The engaged portion of the torque value setting unit is engaged.

Further, in the present invention, the torque value setting means may include an input unit for inputting a lock torque value to the control board.

Furthermore, in the present invention, the torque value setting means may be provided with a communication means for performing communication of the lock torque value with the message processing means to set the lock torque value to the control substrate.

Further, in the present invention, the torque value setting device may include a detecting unit that detects a connection state between the torque value setting unit and the connection unit, and controls a connection state between the substrate storage torque value setting unit and the connection unit.

Further, in the present invention, the control board may store the date and time when the torque value setting unit is connected and disconnected with the connection unit as the connection status.

Further, in the present invention, the control board may set the lock torque value of the torque value setting unit to the origin position.

Furthermore, in the present invention, the control board may be set to rotate the torque value setting unit to set the lock torque value to the origin position.

The invention provides a torque value setting device for setting a locking torque value in a torque value setting portion, the torque value setting portion is provided in the locking tool, and the locking tool can measure the locking member to be locked The tight tightening torque is a predetermined tightening torque value.

The present invention provides a torque value setting method which is executed by a torque value setting device for setting a lock torque value to a torque value setting portion of a locking tool, the locking tool It can be measured that the locking torque when the locking member is locked is a predetermined locking torque value, and the torque value setting device performs the following steps: a calculation step, which is used to set the locking torque value to the rotation The driving amount of the driving unit of the moment setting unit and the locking torque value setting step drive the driving unit to set the locking torque value in the torque value setting unit based on the driving amount.

Further, the present invention may perform a calibration step of calibrating the origin position of the torque value setting portion and the origin position of the drive portion before setting the lock torque value.

The invention can improve the traceability of the locking operation of the locking member. Furthermore, the present invention is capable of maintaining the measurement accuracy of the mechanical preset type torque wrench.

Hereinafter, specific embodiments of the torque value setting system, the torque value setting device, and the torque value setting method of the locking tool according to the present invention will be described with reference to the drawings. In the following description, the torque value setting device will be described by setting a torque value to a torque wrench that is an example of a locking tool including a torque value setting unit.

Fig. 1 is a schematic view showing a torque value setting system according to an embodiment of the present invention.

[Configuration of Torque Wrench Torque Value Setting System] The configuration of the torque value setting system 1 will be described.

As shown in FIG. 1, the torque value setting system 1 includes a torque wrench 10 and a torque value setting device 20.

The torque wrench 10 is an example of a locking tool for locking a locking member such as a bolt or a nut to a predetermined locking point. The torque wrench 10 can measure the tightening torque (hereinafter referred to as "locking torque value") when the tightening torque when the locking member is locked is a predetermined value.

The torque value setting device 20 is a device for setting a lock torque value to a lock tool such as the torque wrench 10 or the like.

[Configuration of Torque Wrench] FIG. 2 is a partial cross-sectional view showing an example of the torque wrench 10 in which the tightening torque value is set by the torque value setting system 1 shown in FIG. 1 .

The torque wrench 10 is a so-called mechanical preset type torque wrench. The torque wrench 10 includes a casing 11, a head portion 12, a head pin 13, a toggle lever 14, a connecting portion 15, a support portion 16, a spring 17, a torque value setting portion 18, and a set position detecting portion 19.

The casing 11 accommodates components of the torque wrench 10 such as the head portion 12 and the toggle lever 14, and is a substantially cylindrical member constituting the outer shape of the torque wrench 10. A head 12 is provided at one end of the outer casing 11. Further, at the other end of the outer casing 11, a grip portion 11b for gripping by an operator is provided.

The head 12 includes a ratchet head 12a, an arm portion 12b, and a link 12c. The head portion 12 is rotatably supported with respect to the outer casing 11 at a head pin 13 provided at a boundary between the ratchet head 12a and the arm portion 12b.

The ratchet head 12a is exposed from the outer casing 11. A socket wrench (not shown, which is used to lock a bolt or a nut) that is engaged with the locking member is detachably mounted to the ratchet head 12a. The arm portion 12b is housed inside the outer casing 11. The arm portion 12b is swingable inside the casing 11 around the head pin 13. The front end of the arm portion 12b is provided with a coupling member 12c that is connected to the toggle lever 14.

The toggle lever 14 is a substantially rectangular plate-shaped member. One end of the toggle lever 14 is coupled to the coupling member 12c of the head portion 12, and the other end is coupled to the support portion 16 via the connecting portion 15. The toggle lever 14 is swingably supported by the coupling member 12c inside the casing 11.

The support portion 16 is a substantially cylindrical member. The support portion 16 is disposed inside the casing 11 in a plane perpendicular to the axial direction (longitudinal direction) of the torque wrench 10 . The support portion 16 is slidably coupled to the other end of the toggle lever 14 via the connecting portion 15. The other side of the plane of the support portion 16 is in contact with the spring 17.

The spring 17 is disposed at a position inside the casing 11 near the grip portion 11b. The spring 17 is a compression spring whose compression direction is the same as the longitudinal direction of the torque wrench 10. The spring 17 can be, for example, a coil spring.

The torque value setting portion 18 can be provided, for example, at the front end of the grip portion 11b of the outer casing 11. The torque value setting unit 18 is composed of a setting bolt 18a, a stopper 18b, a bolt head portion 18c, a lock portion 18d, and a spring support portion 18e.

FIG. 3 is a bottom view showing the vicinity of the torque value setting portion 18 of the torque wrench 10. As shown in FIG. 3, the setting bolt 18a passes through the hole provided in the stopper 18b, and only the bolt head 18c is exposed outside the stopper 18b, and the shaft body of the setting bolt 18a is housed inside the casing 11. in. An engaged portion such as a gear or a hexagon socket or the like is formed in the bolt head portion 18c. The bolt head portion 18c can rotate the setting bolt 18a by engaging with an engaging portion such as a gear or a hex wrench provided in the torque value setting device 20.

At least a portion of the set bolt 18a is externally threaded. The setting bolt 18a is screwed to the internal thread provided on the spring support portion 18e. The stopper 18b limits the amount of movement of the setting bolt 18a by contacting the bolt head portion 18c.

The contact surface of the spring support portion 18e provided inside the outer casing 11 is in contact with the spring 17. The spring support portion 18e compresses the spring 17 in the direction toward the support portion 16. The torque value setting unit 18 moves the bolt head portion 18c to move the position of the spring support portion 18e to which the bolt 18a is screwed. Therefore, the torque value setting portion 18 can change the pressing force applied to the support portion 16 by the spring 17. The torque value setting portion 18 can adjust the degree of compression of the spring 17 by rotating the setting bolt 18a, and set the locking torque value to a predetermined value (for example, the regulation determined by each locking member at the locking point) Locking torque value) (see Figures 4 and 5).

Returning to Fig. 2, the locking portion 18d is provided at the upper end of the grip portion 11b of the outer casing 11 (near the end portion of the head portion 12). Even if the setting bolt 18a is rotated, the locking portion 18d does not change the locking torque value of the torque value setting portion 18. The lock portion 18d is, for example, an annular member provided coaxially with the grip portion 11b, and is capable of changing the relative position with the outer casing 11 along the longitudinal direction of the torque wrench 10.

The installation position detecting portion 19 is provided at, for example, a position at which the position of the setting bolt 18a inside the casing 11 can be detected. The installation position detecting unit 19 is a sensor that detects the positions of the setting bolt 18a and the bolt head 18c. The installation position detecting unit 19 is configured by, for example, a camera or a combination of a light-emitting unit such as an infrared ray and a light-receiving element (photodiode) by setting the position of the bolt 18a and the bolt head portion 18c, and the like. The setting position detecting unit 19 transmits a message such as the detected position of the setting bolt 18a and the bolt head 18c to the control board 23 of the torque value setting device 20 in a wireless or wired manner.

[Operation of Torque Wrench] The operation of the aforementioned torque wrench 10 will be described below.

When the torque wrench 10 locks the locking member, once the tightening torque reaches the set value set by the torque value setting portion 18, the compressive force from the spring 17 acts on the toggle lever 14 about the link member 12c. The direction. The toggle lever 14 is slid with respect to the head 12 by the toggle lever 14 being rotated about the link member 12c. In the torque wrench 10, when the toggle 14 slides relative to the head 12 and comes into contact with the rest of the casing 11 or the like, sound and vibration are generated from the torque wrench 10.

In the torque wrench 10, the sound and vibration caused by the sliding of the toggle lever 14 with respect to the head portion 12 enable the operator to recognize that the tightening torque has reached the set value.

[Configuration of Torque Value Setting Apparatus] Next, the configuration of the torque value setting apparatus 20 of the torque value setting system 1 will be described.

As shown in FIG. 1, the torque value setting device 20 includes a connecting portion 21, a driving portion 22, a control board 23, a communication device 24, and a casing 25.

In a state where the torque wrench 10 is attached to the torque value setting device 20, the connection portion 21 is provided at a position at which the torque value setting portion 18 can be operated. The connecting portion 21 is connected to the torque value setting portion 18 of the torque wrench 10 attached to the torque value setting device 20.

FIG. 4 is a schematic diagram showing an example of the connection portion 21 of the torque value setting device 20. Fig. 5 is a schematic view showing another example of the connecting portion 21 of the torque value setting device 20 shown in Fig. 1 .

As shown in FIGS. 4 and 5, specifically, the connecting portion 21 is provided, for example, in the accommodating portion 25a of the casing 25. The accommodating portion 25a can accommodate the grip portion 11b of the torque wrench 10. The connecting portion 21 is, for example, a gear shown in FIG. 4 or an engaging portion such as a hexagonal wrench shown in FIG. 5, and is engageable with a gear or a hexagonal hole of the bolt head portion 18c of the torque value setting portion 18. The part is stuck. The connecting portion 21 is an engaging portion that can be engaged with the engaged portion of the bolt head portion 18c of the torque wrench 10, and can be connected to the torque value setting portion 18.

The drive unit 22 is an actuator that can control the amount of driving, such as a servo motor or a solenoid. The drive unit 22 operates the connection unit 21 based on the amount of driving controlled by the control board 23.

The control board (control board) 23 generally implements the function of the torque value setting means by executing the torque value setting method by the electronic device mounted on the control board. The control board 23 sets the lock torque to an arbitrary set value, for example, the origin position of the lock torque value (arbitrary initial value or the limit position of the set range of the torque value setting unit 18). That is, the control board 23 has the function of the origin setting unit together with the connection unit 21 and the drive unit 22. The control board 23 operates the torque value setting unit 18 via the connection unit 21 by controlling the amount of driving of the drive unit 22. The control board 23 operates the torque value setting unit 18 based on the position information of the setting bolt 18a and the bolt head 18c transmitted from the set position detecting unit 19 of the torque wrench 10, and sets the tightening torque of the torque wrench 10 to Set value.

The communication device (communication module) 24 communicates with the message processing device 30 of, for example, a smart phone, a tablet terminal, a personal computer, etc., a message of a locking torque value corresponding to the locking portion of the locking member. The communication device 24 receives the positional information of the setting bolt 18a and the bolt head 18c transmitted from the set position detecting unit 19 of the torque wrench 10. The communication path of the communication device 24 may be wireless communication or wired communication. In addition, the types of communication formats of the communication device 24 and the message processing device 30 are not limited, and for example, Bluetooth (registered trademark), infrared communication, USB (Universal Serial Bus), WAN (Wide Area Network), and LAN (Local Area Network) can be utilized. )Wait.

It is to be noted that the torque value setting unit 20 can set the lock torque value to the control substrate 23 in addition to the communication between the communication device 24 and the message processing unit 30, and can also be touched, for example, from the message processing device 30. The input portion of the control panel or the like is input to the control substrate 23 via the communication device 24.

Further, when the torque wrench 10 has the locking portion 18d for locking the torque value setting portion 18, the torque value setting device 20 may further include a locking operation portion for releasing the locking portion 18d. The lock operation unit switches whether or not the torque value setting operation for the torque value setting unit 18 is accepted by operating the lock portion 18d of the torque wrench 10 provided in the torque value setting device 20.

Further, the torque value setting device 20 may include a set position detecting unit 19 provided in the torque wrench 10 and provided in the vicinity of the drive unit 22. When it is provided in the torque value setting device 20, the set position detecting unit 19 is, for example, a camera, and detects the position of the setting bolt 18a or the like by the captured image.

[Operation of Torque Value Setting Apparatus] Next, a torque value setting method of the torque wrench 10 realized by the operation of the torque value setting means 20 in the torque value setting system 1 will be described using a flowchart.

Fig. 6 is a flow chart showing an example of a torque value setting method executed by the torque value setting system.

When the torque wrench 10 is set by the operator in the accommodating portion 25a of the torque value setting device 20, the control board 23 detects that the torque wrench 10 has been detected by the detecting portion of the limit switch or the optical sensor or the like. It is provided in the accommodating portion 25a. In other words, the detection unit connects the torque value setting unit 18 and the connection unit 21 of the torque value setting device 20 as the connection state between the torque value setting unit 18 and the connection unit 21 of the torque value setting device 20. Detection. The control board 23 stores a record of the connection condition in which the torque wrench 10 has been placed in the accommodating portion 25a, and a message such as date and time are stored in the storage portion. In order to set the lock torque value by the torque value setting means 20, the control board 23 determines the model of the torque wrench 10 that has been set (S101).

By judging the model, the control board 23 sets a range of the settable tightening torque (for example, 20 to 100 N·m, 40 to 200 N·m, etc.) in each of the torque wrenches 10 of different models (S102).

When the lock torque value is transmitted from the message processing device 30 to the communication device 24 of the torque value setting device 20, the lock torque value is input to the storage portion of the control board 23 (S103). It should be noted that the input of the lock torque may be received from the input portion provided in the torque value setting device 20.

The control board (control board) 23 performs an arithmetic step based on the range information of the lock torque value determined in S102, and calculates the drive amount of the drive unit 22 required to set the lock torque value to the torque value setting unit 18. (S104).

After the execution of the calculation step, the torque value setting device 20 inputs an operation to start the setting of the lock torque value of the torque value setting unit 18 of the torque wrench 10 (S105). The control board 23 performs a process of releasing the locked state of the lock portion 18d of the setting bolt 18a of the torque value setting unit 18 of the torque wrench 10 (S106).

After the lock state is released, the control board 23 performs a process of adjusting the set value to an arbitrary initial value or a limit position of the set range of the torque value setting unit 18 (hereinafter referred to as "origin position") before setting the set value. (S107). The adjustment processing of the origin position is a calibration step for accurately setting the set value of the torque wrench 10.

After the set value is adjusted to the origin position, the control board 23 performs a tightening torque setting step of setting the lock torque value to the torque value setting portion 18 (S108). In order to set the lock torque value, the control board 23 drives the drive unit 22 with a pre-calculated drive amount, and drives the torque value setting unit 18 from the origin position to a position corresponding to the lock torque value.

After the drive unit 22 completes the setting of the torque value, the control board 23 locks the lock portion 18d of the setting bolt 18a of the torque value setting unit 18 of the torque wrench 10 (S109). After the lock portion 18d is locked, when the operator takes out the torque wrench 10 from the accommodating portion 25a, the control board 23 detects that the torque wrench 10 has been taken out from the accommodating portion 25a by the detecting means (not shown). . That is, the control board 23 detects the disconnection of the torque value setting unit 18 from the connection unit 21. The control board 23 stores the connection status such as the date and time when the torque value setting unit 18 is disconnected from the connection unit 21, in the storage unit.

As described above, according to the torque value setting system 1 of the torque wrench 10, the tightening torque value of the torque wrench 10 can be set by the torque value setting means 20. Here, the torque value setting system 1 can operate the torque value setting unit 18 of the torque wrench 10 by the connecting portion 21 to set the value of the tightening torque. In other words, according to the torque value setting system 1, the operator or the like can set the predetermined locking torque value without operating the torque value setting unit 18.

Further, according to the torque value setting system 1, since the operator does not need to operate the torque value setting unit 18, the locking member can be surely locked with a predetermined locking torque value. Further, according to the torque value setting system 1, the control board 23 can store a message such as the date and time when the torque wrench 10 is taken out from the accommodating portion 25a in the storage portion.

Therefore, according to the torque value setting system 1, the locking torque of the locking member can be appropriately managed, and the traceability of the locking torque management can be improved.

Further, the torque value setting system 1 operates the torque value setting unit 18 of the torque wrench 10 by the connection unit 21, and can set the lock torque value set in the torque value setting unit 18 to include the origin position. Anywhere.

Therefore, according to the torque value setting system 1, the measurement accuracy of the mechanical preset type torque wrench can be maintained.

It should be noted that the above description is illustrative only and not limiting. Therefore, it will be apparent to those skilled in the art that changes in the above-described embodiments can be made without departing from the scope of the invention.

For example, in the present embodiment, the torque wrench 10 is shown as a locking tool, but the locking tool of the present invention is not limited thereto, and as the locking member, the locking torque can be measured when the locking screw is used, that is, The so-called torque screwdriver.

Further, in the present embodiment, as shown in FIGS. 4 and 5, the gear and the hexagonal hole are shown as the shape of the engaged portion, and the gear and the hex wrench are shown as the shape of the engaging portion, but In the present invention, the shape of the engaged portion and the engaging portion is not limited to this. The shape of the engaged portion and the engaging portion may be, for example, a shape like a Phillips screw and a Phillips screwdriver. Industry availability

The present invention can be applied to management of the locking torque in various industries using locking members such as maintenance of conveying equipment such as airplanes, railways, and automobiles.

1‧‧‧Torque value setting system

10‧‧‧ torque wrench

11‧‧‧Shell

11b‧‧‧ Grip

12‧‧‧ head

12a‧‧‧ ratchet head

12b‧‧‧arm

12c‧‧‧Links

13‧‧‧ head sales

14‧‧‧Toggles

15‧‧‧Connecting Department

16‧‧‧Support

17‧‧‧ Spring

18‧‧‧ Torque value setting unit

18a‧‧‧Setting bolts

18b‧‧‧stops

18c‧‧‧Bolt head

18d‧‧‧Locking

18e‧‧ ‧ spring support

19‧‧‧Set position detection unit

20‧‧‧Torque value setting device

21‧‧‧Connecting Department

22‧‧‧ Drive Department

23‧‧‧Control substrate

24‧‧‧Communication device

25‧‧‧shell

25a‧‧‧ 容部

30‧‧‧Message processing device

Fig. 1 is a schematic view showing a torque value setting system according to an embodiment of the present invention. Fig. 2 is a partial cross-sectional view showing an example of a torque wrench in which a lock torque value is set by the torque value setting system shown in Fig. 1; Fig. 3 is a bottom view showing the vicinity of a torque value setting portion of the torque wrench shown in Fig. 2; 4 is a schematic diagram showing an example of a connection portion of a torque value setting device in the torque value setting system shown in FIG. 1. Fig. 5 is a view showing another example of a connection portion of a torque value setting device in the torque value setting system shown in Fig. 1; Fig. 6 is a flow chart showing an example of a torque value setting method executed by the torque value setting system.

Claims (12)

A torque value setting system, comprising: a locking tool that measures a locking torque when a locking member is locked is a predetermined locking torque value; and a torque value setting device for The locking tool sets the locking torque value, and the locking tool has a torque value setting unit that can set the locking torque value to an arbitrary value, and the torque value setting device includes: a connecting portion that connects the a torque value setting unit; a driving unit for driving the connection unit; and a control board that controls the driving unit to set the locking torque value to the torque value setting unit. The torque value setting system according to claim 1, wherein the control substrate calibrates an origin position of the torque value setting portion of the locking tool and the driving before setting the locking torque value The origin of the department. The torque value setting system according to claim 1, wherein the torque value setting unit sets the locking torque value by a rotation operation, and the driving portion is a motor for making the The torque value setting unit rotates, and the connection portion is an engagement portion that engages with the engaged portion provided in the torque value setting unit. The torque value setting system according to claim 1, wherein the torque value setting device includes an input unit for inputting the lock torque value to the control board. The torque value setting system of claim 1, wherein the torque value setting device is provided with a communication device that performs communication of the locking torque value with the message processing device to lock the lock The tightening torque value is set in the control substrate. The torque value setting system according to claim 1, wherein the torque value setting device includes a detecting unit that detects a connection state between the torque value setting unit and the connection unit, and the control board stores the rotation The connection state between the moment setting unit and the connecting unit. The torque value setting system according to claim 6, wherein the control board stores the date and time when the torque value setting unit is connected and disconnected with the connection unit as the connection status. The torque value setting system according to claim 1, wherein the control board sets the lock torque value of the torque value setting unit to an origin position. The torque value setting system according to the eighth aspect of the invention, wherein the control board is configured to rotate the torque value setting unit to set the tightening torque value to an origin position. A torque value setting device for setting a lock torque value in a torque value setting unit, wherein the torque value setting unit can set the lock torque value of the lock tool to an arbitrary value, the lock The tool can measure that the locking torque when the locking member is locked is a predetermined locking torque value, and the torque value setting device includes: a connecting portion connected to the torque value setting portion; and a driving portion Driving the connecting portion; and controlling the substrate, and controlling the driving portion to set the locking torque value in the torque value setting portion. A torque value setting method is performed by a torque value setting device for setting a locking torque value to a torque value setting portion of a locking tool, and the locking tool can measure The locking torque when the locking member is locked is a predetermined locking torque value, and the torque value setting means performs the following steps: an calculation step is performed for setting the locking torque value to the torque The driving amount of the driving unit of the value setting unit and the locking torque value setting step drive the driving unit based on the driving amount to set the locking torque value to the torque value setting unit. The torque value setting method according to claim 11, wherein the torque value setting means performs a calibration step of calibrating an origin position of the torque value setting portion before setting the locking torque value The origin position of the drive unit.