JP2013123789A - Electric rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and appropriately perform torque control without increasing manufacturing cost and improve operability.SOLUTION: An electric rotary tool has a housing having a holder, an electric motor arranged inside the housing, a clutch mechanism arranged inside the housing, a rotation output shaft which has a bit attaching or detaching portion where a driver bit is attached or detached, and is connected to a drive shaft of the electric motor and rotated by a drive force of the electric motor, and a preload mechanism which applies a load to the clutch mechanism and controls the connection state between the drive shaft of the clutch mechanism and the rotation output shaft. A cylinder, and a rod which is operated to the cylinder and changes a load to the clutch mechanism are provided in the preload mechanism.

Description

  The present technology relates to the technical field of electric rotary tools. More specifically, the present invention relates to a technical field in which a preload mechanism that has a cylinder and a rod and applies a load to a clutch mechanism is provided to easily and finely control torque without increasing manufacturing costs and to improve usability.

  There are electric rotary tools for screw tightening and drilling operations. The electric rotary tool is an electric motor as a drive source, a speed reduction mechanism that reduces the rotation speed of the electric motor, a rotation output shaft that is connected to the drive shaft of the drive motor and rotated, and a clutch mechanism that releases the connection between the drive shaft and the rotation output shaft Etc.

  Such an electric rotary tool is provided with a cap coupled by a screw groove to a housing in which an electric motor or the like is disposed, and a spring is disposed inside the cap so that a load is applied to the clutch mechanism by the spring. (For example, refer to Patent Document 1).

  In the electric rotary tool described in Patent Document 1, the magnitude of the load on the clutch mechanism of the spring can be changed by rotating the cap with respect to the casing, and the torque during use can be controlled. Has been.

  As another electric rotary tool, there is one in which a control circuit for electrically controlling torque during use is provided inside a casing.

JP 2011-101926 A JP-A-5-104454

  However, in the electric rotary tool described in Patent Document 1, the torque is changed by manually rotating the cap, and the torque cannot be automatically controlled from an external control device. There is a problem of being bad.

  Moreover, if the cap is rotated to change the magnitude of the load on the clutch mechanism of the spring, and the elastic force of the spring changes due to secular change, it may not be possible to secure the necessary torque during use. There is also.

  On the other hand, in the electric rotary tool described in Patent Document 2, electrical torque can be controlled and the usability is improved, but it is necessary to use a complicated control circuit. There is a problem that the manufacturing cost of the tool is high.

  Therefore, an electric rotating tool of the present technology has an object to overcome the above-described problems and to improve usability by easily and appropriately controlling torque without causing an increase in manufacturing cost.

  First, in order to solve the above-described problem, the electric rotary tool includes a housing having a grip portion, an electric motor disposed inside the housing, and a clutch mechanism disposed inside the housing. And a bit attaching / detaching portion to / from which the driver bit is attached / detached, which is connectable to the driving shaft of the electric motor and is rotated by the driving force of the electric motor, and applies a load to the clutch mechanism. A preload mechanism for controlling a connection state of the drive shaft and the rotary output shaft by the clutch mechanism, and a rod that is operated with respect to the preload mechanism to the cylinder and changes a load on the clutch mechanism. Are provided.

  Therefore, in the electric rotary tool, the load of the preload mechanism on the clutch mechanism is changed according to the internal pressure of the cylinder.

  Secondly, in the electric rotating tool described above, an air cylinder is used as the cylinder, and the internal pressure of the air cylinder is adjusted by an electropneumatic regulator, and the rod with respect to the clutch mechanism according to a change in the internal pressure of the air cylinder. It is desirable that the load be changed.

  An air cylinder is used as the cylinder, and the load on the clutch mechanism of the rod is changed according to the change in the internal pressure of the air cylinder by adjusting the internal pressure of the air cylinder. Regulated by the input electrical signal to the electropneumatic regulator.

  Third, in the electric rotating tool described above, it is desirable that a plurality of the cylinders and the rods be provided.

  By providing a plurality of cylinders and rods, the internal pressure of each cylinder can be adjusted separately.

  Fourthly, in the electric rotary tool described above, it is desirable that the cylinder and the rod are provided on the opposite sides of the rotary output shaft.

  By providing the cylinder and the rod on the opposite side across the rotation output shaft, the load on the clutch mechanism by the preload mechanism is applied with a good balance.

  Fifth, in the electric rotary tool described above, a sensor for detecting the state of the rotary output shaft is provided, and the detection result by the sensor when the connection between the drive shaft and the rotary output shaft is released by the clutch mechanism. It is desirable to stop the rotation of the electric motor based on the above.

  By providing a sensor that detects the state of the rotation output shaft, and by stopping the rotation of the electric motor based on the detection result by the sensor when the connection between the drive shaft and the rotation output shaft is released by the clutch mechanism, The rotation of the drive shaft is stopped in a state where the connection between the drive shaft and the rotation output shaft is released.

  The electric rotating tool of the present technology includes a housing having a gripping portion, an electric motor disposed in the housing, a clutch mechanism disposed in the housing, and a bit attaching / detaching portion to which a driver bit is attached / detached. A rotation output shaft that is connectable to the drive shaft of the electric motor and is rotated by the driving force of the electric motor; and a load applied to the clutch mechanism to provide the load to the clutch mechanism and the rotation output. A preload mechanism for controlling the coupling state of the shaft, and the preload mechanism is provided with a cylinder and a rod that is operated with respect to the cylinder and changes a load on the clutch mechanism.

  Accordingly, since the load of the preload mechanism on the clutch mechanism is changed according to the internal pressure of the cylinder, the torque of the electric rotary tool can be easily and appropriately controlled from the outside without causing an increase in manufacturing cost. Improvements can be made.

  In the invention described in claim 2, an air cylinder is used as the cylinder, and an internal pressure of the air cylinder is adjusted by an electropneumatic regulator, and the rod with respect to the clutch mechanism according to a change in the internal pressure of the air cylinder. The load is changed.

  Therefore, the torque of the electric rotary tool can be adjusted by an external electric signal input to the electropneumatic regulator, and torque control can be easily set.

  In the invention described in claim 3, a plurality of the cylinders and the rods are provided.

  Therefore, the torque of the electric rotary tool can be finely adjusted by adjusting the internal pressure of each cylinder separately.

  In the invention described in claim 4, the cylinder and the rod are provided on opposite sides of the rotation output shaft.

  Therefore, a load applied to the clutch mechanism by the preload mechanism can be applied with a good balance, and an appropriate operation performance of the clutch mechanism can be ensured.

  According to a fifth aspect of the present invention, a sensor for detecting a state of the rotation output shaft is provided, and a detection result by the sensor when the connection between the drive shaft and the rotation output shaft is released by the clutch mechanism. Based on the above, the rotation of the electric motor is stopped.

  Therefore, the rotation stop state of the rotation output shaft and the driver bit can be reliably maintained and power consumption can be reduced.

  Hereinafter, the best mode for carrying out the electric rotary tool of the present technology will be described with reference to the accompanying drawings.

  In the best mode shown below, the electric rotary tool of the present technology is applied to a screwdriver. However, the scope of application of the present technology is not limited to a screw tightening driver, and can be applied to, for example, a screwdriver or a screwdriver for both screw tightening and hole drilling. In addition, the electric rotating tool of the present technology can be widely applied to other types of rotating electric tools.

  In the following description, the axial direction of the rotation output shaft of the driver bit in the electric rotary tool is the vertical direction. However, the front-rear, up-down, left-right directions shown below are for convenience of explanation, and the implementation of the present technology is not limited to these directions.

[Configuration of electric rotating tool]
First, the configuration of the electric rotary tool will be described.

  The electric rotary tool 1 includes a main body 2 and a pneumatic unit 3 (see FIG. 1).

  The main body 2 is configured by arranging necessary parts on a housing 4. The housing 4 includes a case 5 formed in a substantially cylindrical shape extending vertically and a cap 6 attached to the upper end of the case 5. The outer peripheral surface of the housing 4 is a grip portion 4 a that is gripped by an operator when the electric rotary tool 1 is used.

  Inside the case 5, a motor arrangement space 5a and a mechanism arrangement space 5b are formed, and the motor arrangement space 5a and the mechanism arrangement space 5b are communicated with each other. A shaft insertion hole 5c extending vertically is formed at the center of the lower end portion inside the case 5, and the upper end of the shaft insertion hole 5c communicates with the mechanism arrangement space 5b.

  In the case 5, an annular member arrangement space 5d is formed on the outer peripheral side of the shaft insertion hole 5c, and the member arrangement space 5d is opened downward. A part of the member arrangement space 5d is communicated with a mechanism arrangement space 5b located above it via a communication part 5e.

  An electric motor 7 is arranged in the motor arrangement space 5a of the case 5, and the electric motor 7 is provided with a drive shaft 7a protruding downward.

  In the mechanism arrangement space 5b of the case 5, the speed reduction mechanism 8 and the clutch mechanism 9 are arranged in a vertically positioned state. The speed reduction mechanism 8 has a function of reducing the rotation speed of the electric motor 7 and transmitting it to the rotation output shaft described later.

  A protrusion 9a is provided on the lower surface of the clutch mechanism 9, and a portion adjacent to the protrusion 9a is formed as a recess 9b (see FIG. 2).

  A part of the rotation output shaft 10 is disposed in the shaft insertion hole 5c of the case 5, and the rotation output shaft 10 is connected to the drive shaft 7a of the electric motor 7 via the speed reduction mechanism 8 (see FIG. 1). Therefore, when the electric motor 7 is rotated, the driving force is transmitted to the rotation output shaft 10 via the speed reduction mechanism 8, and the rotation output shaft 10 is decelerated and rotated by the speed reduction mechanism 8.

  The rotation output shaft 10 includes a detected portion 11 provided at a central portion in the vertical direction, a driving force transmitting portion 12 positioned above the detected portion 11, and a bit attaching / detaching portion 13 positioned below the detected portion 11. Become. A bit fitting hole 13a opened downward is formed in the bit attaching / detaching portion 13, and the bit fitting hole 13a has a non-circular horizontal cross-sectional shape such as a hexagonal shape.

  A steel ball 14 is disposed in the communication portion 5 e of the case 5. The steel ball 14 is in a state in which the upper end portion is engaged with both the protrusion 9a and the recess 9b formed on the lower surface of the clutch mechanism 9 (see FIG. 2).

  A pair of sensors 15 and 15 are attached to the lower end portion of the case 5 on the opposite side across the rotation output shaft 10, and the detection portions 15a and 15a of the sensors 15 and 15 are positioned below the case 5 (FIG. 1). reference).

  The detectors 15a and 15a of the sensors 15 and 15 are positioned to the side of the detected portion 11 of the rotation output shaft 10, and the displacement of the detected portion 11 when the rotation output shaft 10 is moved in the vertical direction, for example. To detect.

  The electric rotary tool 1 is provided with a drive control unit 16. The drive control unit 16 is disposed, for example, inside the case 5 and sends a drive control signal to the electric motor 7. When the drive control signal sent from the drive control unit 16 is input to the electric motor 7, the electric motor 7 is rotated or stopped.

  A detection signal based on the detection result detected by the sensors 15 and 15 is input to the drive control unit 16. The drive control unit 16 sends a drive control signal based on the detection signal input from the sensors 15, 15 to the electric motor 7.

  The pneumatic unit 3 is formed by holding required parts on a holder 17. The holder 17 is formed in a box shape opened upward, has a bottom surface portion 18 and a peripheral surface portion 19 protruding upward from the outer peripheral portion of the bottom surface portion 18, and surrounds the lower end portion of the case 5 from below. The surface portion 19 is fixed to the housing 4.

A shaft insertion hole 18a is formed at the center of the bottom surface portion 18, and rod insertion holes 18b and 18b are formed on the opposite side across the shaft insertion hole 18a. The bit attaching / detaching portion 13 of the rotary output shaft 10 is inserted into the shaft insertion hole 18 a of the bottom surface portion 18, and the bit attaching / detaching portion 13 protrudes downward from the holder 17.
Cylinders 20 and 20 are attached to the bottom surface of the bottom surface portion 18. Supply holes 20a and 20a are formed in the cylinders 20 and 20, respectively. As the cylinders 20 and 20, for example, air cylinders are used.

  Rods 21 and 21 are supported on the cylinders 20 and 20 so as to be movable in the vertical direction, respectively. The rods 21 and 21 are respectively upward from the center portions of the plate-like closed portions 21a and 21a and the closed portions 21a and 21a facing the vertical direction. It consists of shaft parts 21b and 21b protruding to the right. The blocking portions 21a and 21a are positioned inside the cylinders 20 and 20, respectively, and the shaft portions 21b and 21b are inserted into the rod insertion holes 18b and 18b of the bottom surface portion 18, respectively. The rods 21 and 21 are located at the same distance in the radial direction with respect to the axis center of the rotary output shaft 10. The insides of the cylinders 20 and 20 are kept airtight by closed portions 21a and 21a, respectively.

  A pressing member 22 and a receiving member 23 are disposed inside the holder 17.

  The pressing member 22 includes a pressing portion 22a formed in a cylindrical shape extending in the vertical direction and an actuated portion 22b protruding outward from the lower end portion of the pressing portion 22a. The pressing portion 22a is arranged in the member arrangement space 5d of the case 5 except for the lower end portion. In the pressing member 22, the shaft portions 21 b and 21 b of the rods 21 and 21 are pressed against the operated portion 22 b from below. In the pressing member 22, the axis center of the actuated portion 22 b coincides with the axis center of the rotation output shaft 10.

  The receiving member 23 includes a base portion 23a formed in a cylindrical shape extending in the vertical direction and a receiving portion 23b extending outward from the upper end portion of the base portion 23a. The receiving member 23 is arranged in the member arrangement space 5d of the case 5, the base portion 23a is positioned inside the pressing member 22, and the pressing portion 22a of the pressing member 22 is pressed against the receiving portion 23b from below. A part of the upper surface of the receiving portion 23 b of the receiving member 23 is in a state in which the steel ball 14 disposed in the communication portion 5 e of the case 5 is in contact.

  Air is supplied to the cylinders 20 and 20 from the electropneumatic regulator 25 through the supply holes 20a and 20a. The internal pressure of the cylinders 20 and 20 is changed according to the supply amount of air supplied from the electropneumatic regulator 25, and the load on the clutch mechanism 9 of the rods 21 and 21 is changed according to the magnitude of the internal pressure of the cylinders 20 and 20, respectively. Is done. When the load of the rods 21 and 21 is changed, the pressing force of the rods 21 and 21 against the pressing member 22 is changed, and the changed pressing force is transmitted to the steel ball 14 via the receiving member 23. Therefore, the pressing force (load) of the steel ball 14 against the clutch mechanism 9 is adjusted by the electropneumatic regulator 25.

  As described above, the cylinders 20 and 20, the rods 21 and 21, the pressing member 22, the receiving member 23, and the steel ball 14 apply a load to the clutch mechanism 9, and the drive shaft 7 a and the rotation output shaft of the electric motor 7 by the clutch mechanism 9. It functions as a preload mechanism 24 that controls the ten connected states.

  The amount of air supplied to the cylinders 20, 20 of the electropneumatic regulator 25 is set by an input electric signal output from an external control device (not shown) to the electropneumatic regulator 25.

  As described above, in the electric rotary tool 1, the internal pressure of the cylinders 20 and 20 is changed by adjusting the amount of air supplied from the electropneumatic regulator 25 to the cylinders 20 and 20, so that the clutch mechanism 9 of the steel ball 14 is changed. The pressing force against can be changed. As will be described later, the clutch mechanism 9 is rotated when a load greater than a predetermined torque is applied to the rotation output shaft 10 to release the connection between the drive shaft 7a of the electric motor 7 and the rotation output shaft 10. To work. Therefore, when the supply amount of air from the electropneumatic regulator 25 to the cylinders 20 and 20 is adjusted, the torque in the electric rotary tool 1 is increased by increasing the internal pressure of the cylinders 20 and 20. The torque in the electric rotary tool 1 is reduced by reducing the internal pressures 20 and 20.

  Since the supply amount of air from the electropneumatic regulator 25 to the cylinders 20 and 20 is set by an electric signal input to the electropneumatic regulator 25, the magnitude of torque in the electric rotary tool 1 is set by the electric signal input to the electropneumatic regulator 25. Will be able to.

[Operation of electric rotating tool]
Next, the operation of the electric rotary tool 1 will be described.

  When the electric rotary tool 1 is screwed, the driver bit 26 is fitted and attached to the bit fitting hole 13a formed in the bit insertion / removal portion 13 of the rotary output shaft 10.

  When the electric motor 7 is rotated, the driving force of the electric motor 7 is transmitted to the rotation output shaft 10 through the speed reduction mechanism 8, and the rotation output shaft 10 and the driver bit 26 are integrally decelerated and rotated to be screwed. Work is done.

  In the screw tightening operation, a load is applied to the rotation output shaft 10 and a rotational force acts on the clutch mechanism 9. However, in a state where the load on the rotation output shaft 10 is smaller than the torque in the electric rotary tool 1, The rotation of the clutch mechanism 9 is regulated by the steel ball 14 (see FIG. 2), the connection state of the drive shaft 7a of the electric motor 7 and the rotation output shaft 10 is maintained, and the rotation state of the rotation output shaft 10 and the driver bit 26 is maintained. The

  In the screw tightening operation, when the load on the rotation output shaft 10 becomes larger than the preset torque in the electric rotary tool 1, the rotation of the driver bit 26 and the rotation output shaft 10 is stopped. When the rotation of the rotation output shaft 10 is stopped, the clutch mechanism 9 is rotated in a predetermined direction. When the clutch mechanism 9 is rotated in a predetermined direction, the protrusion 9a of the clutch mechanism 9 rides on the steel ball 14 and the steel ball 14 is engaged only with the protrusion 9a (see FIG. 3).

  When the steel ball 14 is engaged only with the protrusion 9a, the connection between the drive shaft 7a of the electric motor 7 and the rotation output shaft 10 is released. At this time, the rotational output shaft 10 is displaced in the axial direction, the sensors 15 and 15 detect the displacement of the detected portion 11 in the vertical direction, and the detection result is sent to the drive control portion 16. When the detection results of the sensors 15 and 15 are input to the drive control unit 16, a rotation stop control signal is sent from the drive control unit 16 to the electric motor 7 to stop the rotation of the electric motor 7.

  In addition, although the example which detects the displacement in the up-down direction of the to-be-detected part 11 by the sensors 15 and 15 was shown above, for example, the rotation state of the rotation output shaft 10 is detected by the sensors 15 and 15, and a detection result May be sent to the drive control unit 16.

[Summary]
As described above, the electric rotary tool 1 includes the preload mechanism 24 that applies a load to the clutch mechanism 9 and controls the connection state between the drive shaft 7a of the electric motor 7 and the rotation output shaft 10 by the clutch mechanism 9. The preload mechanism 24 is provided with cylinders 20, 20 and rods 21, 21 that operate on the cylinders 20, 20 and change the magnitude of the load on the clutch mechanism 9.

  Therefore, since the load of the preload mechanism 24 on the clutch mechanism 9 is changed according to the internal pressure of the cylinders 20 and 20, the torque of the electric rotary tool 1 is easily and appropriately controlled from the outside without causing an increase in manufacturing cost. Can improve usability.

  In the electric rotary tool 1, air cylinders are used as the cylinders 20, 20. The internal pressures of the cylinders 20, 20 are adjusted by the electropneumatic regulator 25, and the rods 21, 21 are changed according to changes in the internal pressure of the air cylinders 20, 20. The load on the clutch mechanism 9 is changed.

  Therefore, the torque of the electric rotary tool 1 can be adjusted by an input electric signal to the electropneumatic regulator 25 from the outside, and torque control can be easily set.

  The torque range of the electric rotary tool 1 is determined from the minimum operating pressure of the cylinders 20 and 20 to the maximum allowable pressure of the cylinders 20 and 20. Therefore, depending on the type of the electropneumatic regulator 25 used, the torque of the electric rotary tool 1 It is possible to increase the value of.

  Further, since the electric rotary tool 1 is provided with a plurality of cylinders 20 and 20 and rods 21 and 21, the torque of the electric rotary tool 1 is finely adjusted by adjusting the internal pressure of each cylinder 20 and 20 separately. It can be performed.

  In addition, although the example which provided the two cylinders 20 and 20 and the rods 21 and 21 was shown above, the electric rotary tool 1 is provided with one or three or more arbitrary numbers of the cylinders 20 and the rods 21. It is possible.

  Further, since the cylinders 20 and 20 and the rods 21 and 21 are provided on the opposite side across the rotation output shaft 10, the load on the clutch mechanism 9 by the preload mechanism 24 can be applied in a good balance, and the clutch mechanism 9 proper operation performance can be ensured.

  Furthermore, in the electric rotary tool 1, when the coupling between the drive shaft 7 a of the electric motor 7 and the rotary output shaft 10 is released by the clutch mechanism 9, the electric rotary tool 1 is based on the detection results of the sensors 15 and 15. The rotation is stopped.

  Therefore, the rotation stop state of the rotation output shaft 10 and the driver bit 26 can be reliably held and power consumption can be reduced.

[Others]
Although the example which adjusts the internal pressure of the cylinders 20 and 20 with the pneumatic regulator 25 was shown above, in the electric rotary tool 1, it is also possible to comprise so that a rod may operate | move with respect to a cylinder by oil_pressure | hydraulic, for example. It is.

  In addition, instead of the air pressure regulator 25, it is possible to manually open and close the valve and adjust the internal pressure of the cylinders 20 and 20.

[Technology]
The present technology may be configured as follows.

  (1) A housing having a gripping portion, an electric motor disposed inside the housing, a clutch mechanism disposed inside the housing, and a bit attaching / detaching portion to / from which a driver bit is attached / detached A rotation output shaft that is connectable to a drive shaft of the electric motor and rotated by a driving force of the electric motor, and a connection state of the drive shaft and the rotation output shaft by the clutch mechanism by applying a load to the clutch mechanism An electric rotary tool provided with a preload mechanism for controlling the cylinder, and provided with a cylinder and a rod that is operated with respect to the cylinder and changes a magnitude of a load on the clutch mechanism.

  (2) An air cylinder is used as the cylinder, and an internal pressure of the air cylinder is adjusted by an electropneumatic regulator so that a load on the clutch mechanism of the rod is changed according to a change in the internal pressure of the air cylinder. The electric rotary tool according to (1).

  (3) The electric rotary tool according to (1) or (2), wherein a plurality of the cylinders and the rods are provided.

  (4) The electric rotary tool according to (3), wherein the cylinder and the rod are provided on opposite sides of the rotation output shaft.

  (5) A sensor for detecting a state of the rotation output shaft is provided, and the electric motor rotates based on a detection result of the sensor when the connection between the drive shaft and the rotation output shaft is released by the clutch mechanism. The electric rotary tool according to any one of (1) to (4), wherein the electric rotary tool is stopped.

  The specific shapes and structures of the respective parts shown in the best mode of the technology described above are merely examples of the implementation of the present technology, and thus the technical scope of the present technology. Should not be interpreted in a limited way.

The electric rotating tool of the present technology is shown together with FIG. 2 and FIG. 3, and this drawing is a longitudinal sectional view. It is a bottom view which shows the state in which the steel ball is engaged with both the protrusion part and recessed part of a clutch mechanism. It is a bottom view which shows the state in which the steel ball is engaged only with the protrusion part of the clutch mechanism.

  DESCRIPTION OF SYMBOLS 1 ... Electric rotary tool, 4 ... Housing | casing, 4a ... Gripping part, 7 ... Electric motor, 7a ... Drive shaft, 9 ... Clutch mechanism, 10 ... Rotation output shaft, 13 ... Bit attaching / detaching part, 15 ... Sensor, 20 ... Cylinder , 21 ... Rod, 24 ... Preload mechanism, 25 ... Electro-pneumatic regulator, 26 ... Driver bit

Claims (5)

A housing having a gripping portion;
An electric motor disposed inside the housing;
A clutch mechanism disposed inside the housing;
A rotating output shaft that has a bit attaching / detaching portion to / from which the driver bit is attached and can be connected to the driving shaft of the electric motor and is rotated by the driving force of the electric motor;
A preload mechanism that applies a load to the clutch mechanism and controls a connection state of the drive shaft and the rotation output shaft by the clutch mechanism;
An electric rotary tool, wherein the preload mechanism is provided with a cylinder and a rod that is operated with respect to the cylinder and changes a magnitude of a load on the clutch mechanism. An air cylinder is used as the cylinder,
The electric rotary tool according to claim 1, wherein an internal pressure of the air cylinder is adjusted by an electropneumatic regulator so that a load on the clutch mechanism of the rod is changed according to a change in the internal pressure of the air cylinder. The electric rotary tool according to claim 1, wherein a plurality of the cylinders and the rods are provided. The electric rotary tool according to claim 3, wherein the cylinder and the rod are provided on opposite sides of the rotary output shaft. A sensor for detecting the state of the rotation output shaft is provided,
The electric rotary tool according to claim 1, wherein rotation of the electric motor is stopped based on a detection result by the sensor when the connection between the drive shaft and the rotation output shaft is released by the clutch mechanism.

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