JP2002059370A - Portable torquing device and electric screwdriver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable torquing device to restrain an axis of rotation from inclining. SOLUTION: The portable electric screwdriver 10 is furnished with a motor 14, a driver shaft part 16 to rotate as torque is transmitted by the motor 14 and a rotor 20 having a specified moment of inertia and to rotate at specified angular velocity. When the driver shaft part 16 is inclined while the screwdriver shank part 16 rotates, a gyromoment works on the rotor 20 and inclination of the driver shank part 16 is restrained. Consequently, even when the driver shank part 16 is inclined, a position of the electric driver 10 is controlled. Additionally, when a worker weak in muscular power and gripping power works, it is possible to sufficiently restrain inclination of the driver shank part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand-held rotating force applying device and an electric driver which suppress the inclination of a rotating shaft.

[0002]

2. Description of the Related Art Conventionally, when a screw is attached and detached using a hand-held electric screwdriver, the electric screwdriver is tilted during use of the electric screwdriver (see FIG. 8), and the screw is cut or the head of the screw is screwed. Undesirable situations often occur such that the screw holes formed in the holes are damaged and the screws cannot be rotated.

As a countermeasure, as shown in FIG. 9, an electric driver 80 is fixed to a rail guide 82, and the electric driver 80 is moved vertically along the rail guide 82.

However, the rail guide 82 must be moved and set on a cabinet or the like in accordance with the position of the screw to be detached by the electric driver 80, so that a space for setting the rail guide 82 is required. In addition, there is a problem that the operation is complicated.

[0005] Such a problem occurs not only with an electric screwdriver but also with a general hand-held tool having a rotating shaft such as an electric drill.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hand-held rotating force applying device and an electric driver which suppress the inclination of the rotating shaft in consideration of the above fact.

[0007]

According to the first aspect of the present invention, there is provided a motor, a rotating shaft portion to which a rotating force is transmitted by the motor to rotate, a predetermined moment of inertia, and a rotation at a predetermined angular velocity. A rotating body that performs rotation of the rotating shaft, when the rotating shaft is tilted during rotation of the rotating shaft, a gyro moment acts on the rotating body to tilt the rotating shaft. Is suppressed.

Accordingly, even if the hand-held rotating force applying device is inclined with respect to the object to be subjected to the rotating force during use of the hand-held rotating force applying device, that is, even if the rotation shaft portion is inclined, the hand-held rotating force applying device can be used. Attitude is controlled. In addition, even if a worker with weak muscle strength or grip strength works, it is possible to sufficiently suppress the inclination of the rotating shaft portion, and when a product is manufactured using a hand-held rotating force applying device, Irrespective of the level of skill of the user, it is possible to manufacture the product with a constant quality.

[0009] The invention according to claim 2 is characterized in that a center axis of rotation of the rotating body is the same as the rotating shaft portion, and a rotating force is applied to the rotating body by the motor.

Thus, both the rotating shaft and the rotating body can be rotated by one motor, so that the number of parts can be reduced and the apparatus can be downsized.

[0011] The invention according to claim 3 is characterized in that the motor can be switched between forward rotation and reverse rotation.

Thus, the rotation shaft can be rotated forward and backward.

According to a fourth aspect of the present invention, a plurality of the rotating bodies are provided.

Thus, the size of one rotating body can be reduced, and the size of the apparatus can be reduced.

According to a fifth aspect of the present invention, it is possible to switch between the same-direction rotation and the opposite-direction rotation of the rotating body with respect to the rotating shaft portion.

Thus, the direction of the generated gyro moment can be switched.

According to a sixth aspect of the present invention, there is provided a speed change gear interposed between the motor and the rotating body, a calculating means for calculating a tipping moment around a tip of the rotary shaft, and a calculated tipping torque. Control means for controlling the gear ratio of the transmission gear according to the moment to increase or decrease the gyro moment,
It is characterized by having.

Thus, a gyro moment of an appropriate magnitude can always be generated even if the magnitude of the overturning moment varies.

According to a seventh aspect of the present invention, there is provided an electric driver using the hand-held torque applying device according to any one of the first to sixth aspects.

As a result, when using the electric driver, the guide rail, which has been required in the past, becomes unnecessary.
Therefore, the workability can be improved, and the space required for the work can be reduced. In addition, when a large number of products are assembled using an electric driver, so-called screw fools and mold breakage that occur when screws are tightened can be suppressed, and therefore the occurrence rate of defective products can be greatly reduced.

[0021]

Embodiments of the present invention will be described below with reference to embodiments.

[First Embodiment] In a first embodiment, a hand-held electric driver will be described. As shown in FIG. 1, the electric driver 10 includes a casing 12 having a holding portion (not shown) that can be held by one hand, a motor 14 provided in the casing 12, and a driver shaft rotated by the motor 14. It includes a unit 16 and a rotating body 20 (see also FIG. 2) attached to the rear side of the motor 14.

The driver shaft 16 penetrates the casing 12 and is fixed in direction by a fitting member 22.

The rotating body 20 is rotated by the motor 14. Motor 14, driver shaft 16, and rotating body 20
Are located on the same axis.

The rotating body 20 is a so-called frame, and the rotational direction of the rotating body 20 and the moment of inertia around the rotation axis are affected by the rotating shaft 20 when the driver shaft 16 is tilted during rotation. The posture of the electric driver 10 is determined to be corrected by the gyro moment.

That is, the rotating body 20 is cylindrical and has a predetermined moment of inertia, and is dimensioned so as to be rotated at a predetermined angular velocity by being given a rotating force by the motor 14.

The material of the rotating body 20 is preferably a material having a large specific gravity and having good workability and formability, for example, brass.

The rotation direction of the motor 14 can be switched between a forward direction U and a reverse direction V.

The electric driver 10 is connected to the driver shaft 16
In the case of a device that rotates the rotating body 20 only in the direction opposite to the rotating direction of the motor, a reversing gear mechanism 28 as shown in FIG. 3 may be interposed between the motor 14 and the rotating body 20. Thus, a motor that rotates only in one direction can be used as the motor 14.

The reversing gear mechanism 28 includes a first gear 30 attached to the rotation center shaft 14R of the motor 14, an intermediate gear 32 rotated by the first gear 30 around an axis orthogonal to the rotation center shaft 14R, A second gear 34 that is rotated coaxially with the rotation center shaft 14R by the intermediate gear 32.

The position of the second gear 34 can be changed in the axial direction W of the rotation center axis.
From the first gear 34 to the second gear 34.

As shown in FIG. 4, as a circuit for driving the motor 14, a forward rotation circuit 40A and a reverse rotation circuit 40B are formed, and feedback control is performed by rotation speed sensors 42A and 42B, respectively. You.

The circuits 40A and 40B are respectively
Connected to DC power supply 44 and turned on by switches 46A and 46B
Switching between N and OFF is possible. Therefore, when it is not necessary to control the posture, as shown in FIG.
By turning off the switch 46B provided at a position close to the holding portion of the casing 12, the electric driver 1
The circuit 40B can be immediately turned off during the use of “0”.

As described above, in the first embodiment, even when the electric driver 10 is tilted with respect to the screw (not shown), that is, the driver shaft portion 16 is tilted during the use of the electric driver 10, the rotation is performed. The posture of the electric driver 10 is corrected by the gyro moment generated in the body 20. Further, since the rotating body 20 can be rotated by using the motor 14 for rotating the driver shaft section 16, the electric driver 1
Zero size can be maintained, which is also an energy saving measure.

It is to be noted that a plurality of rotating bodies 20 may be provided. For example, as shown in FIG. 5, rotating bodies 20P and 20Q may be provided on the front side and the rear side of the motor 14, respectively. This makes it possible to reduce the size of one rotating body.

When the weight of the electric driver 10 is large, use of a balancer (not shown) improves workability when working for a long time.

The same effect can be obtained even if the mechanism as described above is used for a hand-held air driver or a luter (polishing machine).

[Second Embodiment] Next, a second embodiment will be described. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 6, in the second embodiment, the hand-held electric driver 50 is different from the first embodiment in that the transmission gear 5 for connecting the rotating body 52 and the motor 14 is the same as in the first embodiment.
4, a sensor 56 for measuring the angular velocity of the inclination of the driver shaft 16, and a driver shaft 1 based on the output value of the sensor 56.
A calculating unit 58 for calculating a tipping moment generated around the tip of the transmission gear 6, and a transmission gear 5 corresponding to the calculated tipping moment.
And a control unit 60 for controlling the gear ratio of No. 4. The transmission gear 54 is a continuously variable gear.

The gyro moment will be briefly described below.

As shown in FIG. 7, it is assumed that the rotationally symmetric object 70 is rotating at a relatively large angular velocity ω about the axis of symmetry (Y axis). The moment of inertia about the Y axis is I,
Both the moments of inertia about the X axis and the Z axis passing through the center of gravity and orthogonal to the Y axis are denoted by I ′. It is assumed that the X axis and the Z axis are fixed to the gyro case, and the X, Y, and Z axes are the principal axes of inertia of the rotationally symmetric object 70.

In this state, if a rotation of angular velocity Ω is applied around the Z axis, the component of the angular momentum vector L is L _X
= 0, L _Y = Iω, and L _Z = I′Ω, and thus the change LL of L is represented by the following equation.

LL = Ω × L = (− IωΩ, 0, 0) Therefore, a moment N satisfying N = LL must be acting on the rotationally symmetric object 70 from the bearing. (IωΩ, 0, 0). This moment is called a gyro moment.

The electric driver 50 according to the second embodiment (FIG. 6)
The controller 60 changes the gear ratio of the transmission gear 54 so that a gyro moment that corrects the attitude of the electric driver 50 is generated according to the generated overturning moment. Thus, even if the magnitude of the overturning moment varies, an appropriate gyro moment always acts on the electric driver 50, and the posture is corrected.

[0045]

According to the present invention having the above-described configuration, the following effects can be obtained.

According to the first aspect of the present invention, during use of the hand-held rotating force applying device, even if the hand-held rotating force applying device is inclined with respect to the rotating object, that is, the rotating shaft portion is inclined. The attitude of the hand-held rotating force applying device is controlled.

According to the second aspect of the present invention, since both the rotating shaft and the rotating body can be rotated by one motor, the number of parts can be reduced and the apparatus can be downsized.

According to the third aspect of the present invention, forward rotation and reverse rotation of the rotating shaft can be performed.

According to the fourth aspect of the present invention, the size of one rotating body can be reduced, and the size of the apparatus can be reduced.

According to the fifth aspect of the invention, it is possible to switch the direction of the generated gyro moment.

According to the sixth aspect of the present invention, a gyro moment of an appropriate magnitude can always be generated even if the magnitude of the overturning moment varies.

According to the seventh aspect of the invention, workability can be improved.

[Brief description of the drawings]

FIG. 1 is a side view showing an electric driver according to a first embodiment.

FIG. 2 is a perspective view showing a rotating body of the electric driver according to the first embodiment.

FIG. 3 is a schematic side view showing a configuration of a reversing gear mechanism interposed between a motor and a rotating body.

FIG. 4 is a circuit diagram for driving a motor of the electric driver according to the first embodiment.

FIG. 5 is a side view showing a modified example of the electric driver according to the first embodiment.

FIG. 6 is a side view of an electric driver according to a second embodiment.

FIG. 7 is a perspective view illustrating a gyro moment.

FIG. 8 is a side view showing that the electric driver inclines when a conventional electric driver is used.

FIG. 9 is a side view showing a state in which a conventional electric driver is mounted on a rail guide.

[Explanation of symbols]

 Reference Signs List 10 electric driver 14 motor 16 driver shaft part (rotating shaft part) 20 rotator 20P rotator 20Q rotator 50 electric driver 52 rotator 54 transmission gear 58 calculation unit (calculation unit) 60 control unit (control unit) 80 electric Expression driver

Claims (7)

[Claims] 1. A hand-held rotating force applying device comprising: a motor; a rotating shaft portion to which a rotating force is transmitted by the motor to rotate; and a rotating body having a predetermined moment of inertia and rotating at a predetermined angular velocity. A device, wherein when the rotating shaft portion is tilted during rotation of the rotating shaft portion, a gyro moment acts on the rotating body to suppress the tilting of the rotating shaft portion. Applicator. 2. The hand-held rotating device according to claim 1, wherein a central axis of rotation of the rotating body is the same as the rotating shaft portion, and a rotating force is applied to the rotating body by the motor. Force applying device. 3. The hand-held torque applying device according to claim 1, wherein the motor can be switched between forward rotation and reverse rotation. 4. The hand-held rotating force applying apparatus according to claim 1, wherein a plurality of said rotating bodies are provided. 5. The hand-held type according to claim 1, wherein switching between the same direction rotation and the opposite direction rotation of the rotating body with respect to the rotating shaft portion is possible. Rotational force applying device. 6. A transmission gear interposed between the motor and the rotating body, a calculating means for calculating a tipping moment around the tip of the rotating shaft portion, and the transmission gear in accordance with the calculated tipping moment A control device for controlling the gear ratio of the gyro moment to increase and decrease the gyro moment, The hand-held rotating force applying device according to any one of claims 1 to 5, further comprising: 7. An electric driver using the hand-held rotational force applying device according to claim 1. Description: