JP2003136419A - Rotary tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary tool which can detect the seating with a simple configuration even when a counter member is formed of a hard or soft material, and prevent excessive tightening or early stopping of a screw. SOLUTION: A distance measuring means 2 is provided on the rotary tool 1. A control unit 6 which detects that the distance between a bearing surface 4 of a counter member 3 and a tip of the rotary tool 1 reaches a predetermined value by the distance measuring means 2, determines the seating, and stops the rotation of the rotary tool 1 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to seating detection of rotary tools such as drill drivers and impact drivers used for screw tightening and loosening operations of bolts and nuts.

[0002]

2. Description of the Related Art Conventionally, the seating detection of a rotary tool has been performed by detecting the tightening torque of the output shaft of the motor and stopping the rotation when a predetermined torque is exceeded. For example, Japanese Patent Laid-Open No. 8-
In the conventional example disclosed in Japanese Patent No. 1536, the ring gear torque sensor is used to operate the electromagnetic clutch mechanism to stop the rotation.

However, if the mating member to be tightened, such as a nut and a bolt, is hard, the torque rises sharply than when contacting (when the screw is seated on the seat surface), but the mating member is wood, gypsum board, or the like. If it is soft, it is not possible to determine where the seating point is, and overtightening or premature stop will occur. In addition, the rotary tool is rarely fixed and used in a fixed place, and is used according to various places and situations, so seating can be reliably detected to prevent overtightening and premature fastening of screws. Is required to do so.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can detect the seating with a simple structure regardless of whether the mating member is hard or soft, and tightens the screws too fast or fast. It is an object of the present invention to provide a rotary tool that can prevent the above-mentioned problem, and that can securely tighten the screw without tilting and more accurately detect the seating.

[0005]

In order to solve the above-mentioned problems, a rotary tool according to the present invention comprises a rotary tool 1 comprising:
The distance measuring means 2 is provided, and when the distance measuring means 2 detects that the seat surface 4 of the mating member 3 and the tip of the rotary tool 1 have reached a predetermined distance, it is judged as seated and the rotary tool 1 is rotated. It is characterized in that a control unit 6 for stopping is provided. With such a configuration, when the screw 9 is screwed into the mating member 3 by the rotary tool 1, the distance measuring means 2 causes the seating surface 4 of the mating member 3 and the tip of the rotary tool 1 to have a predetermined distance. By detecting the fact that the screw 9 is seated on the seat surface 4 of the mating member 3, the motor 5 is stopped, and thus the screw 9 can be prevented from being overtightened or prematurely stopped.

Further, the distance measuring sensor 7 constituting the distance measuring means 2
Is provided, and the inclination of the rotary tool 1 with respect to the seat surface 4 is detected by the difference in the distance between the seat surface 4 of the mating member 3 and the tip of the rotary tool 1 detected by the distance measuring sensors 7. It is preferable to provide an informing means 8 for informing when the seat surface 4 is not at a predetermined angle. With this configuration,
While the screw is tightened by the rotary tool 1, the tilt of the rotary tool 1 is detected, and when the screw 9 is tilted and screwed in, the notifying means 8 gives a notification to inform the user. Since the screw 9 is not tilted and screwed in, and the rotary tool 1 is not tilted and used, it can be screwed at a right angle or a substantially right angle with respect to the seat surface 4, so that the measurement provided on the rotary tool 1 can be performed. The distance sensor 7 can accurately measure the distance between the seat surface 4 and the rotary tool 1, and the seating of the screw 9 on the seat surface 4 can be reliably detected.

Further, it is preferable to provide an informing means 8 for indicating the inclination direction of the rotary tool 1. With such a configuration, when the rotary tool 1 is tilted and used,
The direction of inclination is notified by the notification means 8,
Based on this, it becomes possible to easily correct the posture.

Further, it is preferable to turn off the determination of the distance measuring means 2 when the motor 5 rotates in the reverse direction. With such a configuration, it is possible to loosen or remove the screw 9 once screwed in by reverse rotation in order to make a mistake in screwing or to start over.

Further, it is preferable to provide a switch 10 capable of manually turning off the detection by the distance measuring means 2. With such a configuration, it is possible to turn off the detection of the distance measuring means 2 when continuously rotating in the reverse direction or using a special bit.

Further, it is preferable that the distance measuring means 2 is movably attached to the rotary tool 1 in order to vary the detection distance by the distance measuring means 2. With such a configuration, when it is desired to screw in a little deeper, it can be dealt with by moving the distance measuring means 2.

Further, a rotary tool 1 is constructed by projecting a grip 13 from a body portion 12 having a bit 11 for rotating a screw at a tip thereof in a direction intersecting with the body portion 12, and the grip of the rotary tool 1 is formed. It is preferable to dispose the distance measuring means 2 on the surface of the body portion 2 on the side where the grip 13 projects. With such a configuration, the distance measuring unit 2 does not hit the wall or other objects when working at the corner or the corner of the wall, and the distance is measured between the position of the line of sight and the tip of the bit 11. Since the means 2 is not located and the distance measuring means 2 is provided between the position of the line of sight and the tip of the bit 11, the distance measuring means 2 becomes an obstacle and the efficiency of the screw tightening work is reduced, or the target point for screwing is lowered. It is possible to prevent misunderstanding.

Further, in the rotary tool 1, the distance measuring means 2
The distance measuring means 2 detects that the seat surface 4 of the mating member 3 and the tip of the rotary tool 1 have reached a predetermined distance, and determines that the user is seated or immediately before seated, and measures the seated or immediately before seated. It is also preferable to provide a control unit 6 for stopping the rotation of the rotary tool 1 in which the tightening torque of the output shaft of the motor 5 becomes a predetermined tightening force after the detection by the distance means 2. With such a configuration, the distance measuring means 2 detects just before the seating of the screw 9, and further tightens until the seating or immediately before seating reaches a predetermined tightening force and stops the rotation with a predetermined tightening force. Therefore, the seat can be seated and a predetermined tightening force can be obtained.

Further, when the predetermined torque is reached, the motor 5
It is preferable that the motor 5 is stopped and the motor 5 is rotated for a predetermined time after the motor 5 is stopped for a predetermined time.
With such a configuration, after the seat is seated and a predetermined tightening force is obtained, a certain amount of additional tightening can be performed.

The CCD camera 14 and the light 15 constitute the distance measuring means 2. The light 15 illuminates an object, and the screw 9 at the tip of the rotary tool 1 and the shadow 50 of the bit 11 are lighted up to illuminate the CCD camera 14. It is preferable that the image is taken and the distance between the seat surface 4 and the tip of the rotary tool 1 is measured by the size and length of the shadow 50. With such a configuration, the seating can be detected with the configuration of the CCD camera 14 and the light 15, and by using the CCD camera 14, it is possible to sample the detailed data of the screw 9 tightening work. Becomes

A bit 11 is provided at the tip of the rotary tool 1, and a contact detecting means 1 for contacting the bearing surface 4 with the tip of the bit 11 is provided.
6 is provided, and the contact detecting means 16 is preferably used as the distance measuring means 2. With such a configuration, the seating can be easily detected by the contact detection means 16 contacting the seat surface.

Further, the rotation of the motor 5 is reduced to reduce the bit 1
The pressure sensor 18 is provided behind the speed reducer 17 that transmits the rotation to
It is preferable that the pressure sensor 18 be used as the distance measuring means 2. With such a configuration, the seating can be detected by detecting the pressing force of the rotary tool 1 to the mating member 3 side by the pressure sensor 18 provided at the rear of the speed reducer 17.

Further, the rotary tool 1 is constructed by projecting a grip 13 from a body portion 12 having a bit 11 for rotating a screw 9 at a tip thereof in a direction intersecting with the body portion 12,
It is preferable that the pressing force detecting means 19 is provided on the surface of the grip 13 opposite to the protruding direction of the bit 11, and the pressing force detecting means 19 is the distance measuring means 2. With such a configuration, the pressing force detecting means 19 provided in the grip 13 can detect the pressing force of the rotary tool 1 toward the mating member 3 side to detect the seating.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the embodiments shown in the accompanying drawings.

FIG. 1 is a schematic diagram of the rotary tool of the present invention. The rotary tool 1 has a grip 13 projecting from the rear of the body 12 in a direction intersecting with the body 12. A motor 5, a speed reducer 17 that reduces the rotation of the motor 5 at a predetermined reduction ratio, and a hammer 20 that transmits the rotation of the motor 5 through the speed reducer 17 in the body 12.
An anvil 21 that is hit by a hammer 20 is provided, and a chuck 22 connected to the anvil 21 is positioned at the tip of the body 12, and the impact force generated by the hit of the anvil 21 is applied to the chuck 22 by screws 9 or bolts. The bit 11 which is the output shaft for transmitting to the
The hit by 1 is generated when a force of a predetermined value or more is applied between the hammer 20 and the anvil 21 and the hammer 20 rotates with respect to the anvil 21 by a certain amount or more.

A trigger switch 24 is provided on the surface of the grip 13 in the same direction as the protruding direction of the bit 11, and further,
A battery 32 and a motor drive FET block 25, which is a motor drive switching element, are provided inside the grip 13.

Distance measuring means 2 is provided in the rotary tool 1 having the above-described structure, and the distance measuring means 2 causes the seat surface 4 of the mating member 3 which is a member to be screwed in and the tip of the rotary tool 1 to be predetermined. There is provided a control unit 6 including a microcomputer for detecting that the screw 9 has reached the distance, and determining that the screw 9 has been seated on the seat surface 4 of the mating member 3, and stopping the rotation of the rotary tool 1. As shown in FIG. 2, the control unit 6 includes a power supply circuit 33, an LED lighting circuit 34, a PWM drive circuit 35, a brake circuit 36,
Control circuit block 4 together with tightening force detection circuit 27, etc.
Configures 0.

Distance measuring means 2 in the embodiment shown in FIG.
Is composed of a distance measuring sensor 7. The distance measuring sensor 7 has a light emitting portion 7a and a light receiving portion 7b.

Then, the screw 9 is screwed into the mating member 3 which is a member to be screwed by the bit 11 of the rotary tool 1, but the trigger switch 24 is used for screwing.
When the power supply circuit 33 is turned on by operating the, the battery voltage is supplied to the motor 5, the control unit 6 and the distance measuring sensor 7 via the PWM drive circuit 35 and the motor drive FET block 25, and the screw 9 is matched by the bit 11 Screw in the member 3. In this case, at the same time, the light emitted from the light emitting portion 7a of the distance measuring sensor 7 hits the seat surface 4 of the mating member 3 and the reflected light is received by the light receiving element 7b, whereby the seat surface 4 of the mating member 3 and the rotary tool 1 are received. Detects the distance between the tip of and. When the distance measuring sensor 7 detects that the distance between the seating surface 4 of the mating member 3 and the tip of the rotary tool 1 reaches a predetermined distance (for example, 50 mm), a signal is sent to the control unit 6 to drive the motor. The brake circuit 36 sends a signal to stop 5 instantly.
To the motor drive FET block 25, the motor drive FET block 25 is turned off, the supply current to the motor 5 is cut off, and the brake state is set, whereby the shut off (motor stop) state is set. At this time, when the trigger switch 24 is pulled, the motor 5 is kept stopped. When the trigger switch 24 is released (returned), the control circuit battery voltage path is cut off, the control circuit is reset, and the operation of the timing trigger switch 24 is awaited. As described above, by the distance measuring sensor 7, the mating member 3
Is measured and the distance between the seat surface 4 and the tip of the rotary tool 1 is measured to detect that the screw 9 is screwed into the mating member 3 and the head of the screw 9 is seated on the seat surface 4 to shut off. Therefore, regardless of whether the material of the mating member 3 is hard or soft, it is possible to reliably shut off in the seated state.

When the distance measuring sensor 7 is provided on the rotary tool 1, a plurality of distance measuring sensors 7 may be provided as shown in FIG. In FIG. 3, a plurality of (two in the embodiment) distance measuring sensors 7 are provided at different positions in the circumferential direction of the body 12. Here, before the work, the distance L1 between the seat surface 4 of the mating member 3 and the tip of the rotary tool 1 measured by the distance measuring sensor 7A and the mating member 3 measured by the distance measuring sensor 7B.
When there is a difference in the distance L2 between the seat surface 4 of the rotary tool 1 and the tip of the rotary tool 1, the rotary tool 1 is inclined at a right angle with respect to the seat surface 4 of the mating member 3. (That is, the screw 9 is tilted), and in this case, the control unit 6 is controlled to shut off (stop the motor 5).
It is controlled by. Therefore, in the work, the screw 9 cannot be driven unless the bit 11 of the rotary tool 1 is positioned perpendicularly to the seat surface 4 of the mating member 3, thereby preventing the screw 9 from being diagonally driven. Is what you can do. In addition, a distance L1 between the seating surface 4 of the mating member 3 and the tip of the rotary tool 1 measured by the distance measuring sensor 7A during work, and the distance measuring sensor 7
When there is a difference in the distance L2 between the seat surface 4 of the mating member 3 and the tip of the rotary tool 1 measured by B, control is performed such as immediately shutting off. Further, when the work is in progress, the tilt may be notified by notifying means 8 such as an LED (lighted by the LED lighting circuit 34) instead of stopping the work in this case. In this case, the worker may stop temporarily. It is possible to select whether to continue the work while correcting the inclination.

Here, as shown in FIG. 4, the inclination direction may be informed by a monitor which is the informing means 8. This monitor is provided on the rotary tool 1. The monitor displays two coordinate axes, an X axis and a Y axis orthogonal to the X axis. Since the current tilt point P is displayed on the monitor, the tilt point P is located at the intersection of the X axis and the Y axis. The inclination of the rotary tool 1 may be corrected by adjusting the posture of the rotary tool 1 as described above.

As mentioned above, the screw 9 is rotated by the rotary tool 1.
When tightening, the tilt of the rotary tool 1 is detected, and when the screw 9 is tilted and screwed in, the notifying means 8 can notify and inform the screw 9,
Can be prevented from being tilted and screwed. As described above, since the rotary tool 1 can be screwed at a right angle or a substantially right angle with respect to the seat surface 4 without being tilted and used, the seat surface 4 and the rotary tool provided by the distance measuring sensor 7 provided in the rotary tool 1 It is possible to accurately measure the distance from the seat 1 and to reliably detect the seating of the screw 9 on the seat surface 4.

By the way, in the rotary tool 1 using the distance measuring sensor 7 as described above, when the screw 9 once screwed in for wrong screwing or redoing is loosened or removed by reverse rotation, When the motor 5 shuts off when the distance sensor 7 detects a predetermined distance when the motor 5 rotates in the reverse direction, the screw 9 cannot be rotated in the reverse direction to be loosened or removed. The control unit 6 controls to turn it off. In this case, the control unit 6 controls the distance measuring means 2 to turn off the determination by monitoring the terminal voltage of one of the motors 5 even when the distance measuring sensor 7 detects a predetermined distance during the reverse rotation operation. Immediately after the operation of the trigger switch 24, the voltage at one terminal of the motor 5 is unstable, so that a few seconds msec (about 5 msec.
Do not operate for about 0 msec). That is,
The sensory time is set to a level at which the operator does not think that the activation of the motor 5 is slow after operating the trigger switch 24. As a result, it is possible to loosen or remove the screw 9 once screwed in by reverse rotation in order to make a wrong screwing or to start over.

Further, in the rotary tool 1 in which the motor 5 is shut off when the operator detects the seat by the distance measuring means 2 as described above, the shutoff control by the seat detection is performed. Separately, a function that allows selection of a mode not using seating detection may be provided. That is, as shown in FIG. 1, the rotary tool 1 is provided with a switch 10 capable of manually turning off the detection by the distance measuring means 2, and the detection by the distance measuring means 2 is turned on or off. Allows you to manually select. In this case, the distance measuring sensor 7 itself is turned off by operating the switch 10, or the control circuit is switched so as not to receive a signal from the distance measuring sensor 7. In this way, by providing the switch 10 capable of manually turning off the detection by the distance measuring means 2, the distance measuring means 2 can be used when continuously rotating in the reverse direction or using a special bit. It can be used with the detection of turned off.

In the embodiment shown in FIG. 1, the distance measuring means 2 is movably attached to the rotary tool 1 so that the distance detected by the distance measuring means 2 can be changed. 1, the distance measuring sensor 7 is attached to the body 12 of the rotary tool 1 via the attachment member 26, but in FIG. 1, the base 26a for attaching the attachment member 26 to the body 12 is shown.
And a moving member 26b to which the distance measuring sensor 7 is attached,
A moving member 26b is movably attached to the base portion 26a in the same direction as the axial direction of the bit 11, and can be fixed by a fixing means (not shown) at an arbitrary moving position. In addition, in FIG.
Although an example in which the distance measuring sensor 7 is moved with respect to the body portion 12 by making the moving member 26b attached to the body movable, the distance measuring sensor 7 may be directly movable. As described above, by making the distance measuring means 2 movable with respect to the rotary tool 1, not only adjustment of variations in the components of the distance measuring sensor 7 can be performed, but also when it is desired to screw in a little deeper, the distance measuring means 2 Can be dealt with by moving.

When the distance measuring sensor 7 is provided on the body portion 12 of the rotary tool 1, the distance measuring means 2 should be arranged on the surface of the body portion 12 on which the grip 13 is projected, as shown in FIG. Is preferred. In other words, by disposing the distance measuring means 2 on the surface of the body 12 on the side where the grip 13 protrudes, the distance measuring means 2 does not hit the wall or other objects when working at a corner or a corner of the wall. It is a thing. Further, in order to aim at the target point of screwing in the rotary tool 1, bring a line of sight to the upper surface of the body 12 (the surface opposite to the protruding surface of the grip 13 of the body 12) as in the focusing of the pistol. If the distance measuring sensor 7 which is the distance measuring means 2 is provided on the surface of the body portion 12 opposite to the protruding surface of the grip 13, the distance measuring sensor 7 interferes and it is difficult to aim at the screwing target point, and the screw tightening is performed. Although the efficiency of the work is lowered or the target point of the joint is misidentified, the distance measuring means 2 is arranged on the surface of the body 12 on which the grip 13 is projected as described above, so that the position of the line of sight can be improved. Since the distance measuring means 2 is not located between the tip of the bit 11 and the tip of the bit 11, it is possible to prevent the efficiency of the screw tightening work from being lowered and the mistake of the screwing target point.

By the way, when the distance measuring means 2 detects just before the seating as described above, the bit 11 which is the output shaft of the motor 5 is detected after the seating or immediately before the seating is detected by the distance measuring means 2.
The tightening control may be performed by the control unit 6 until the predetermined torque is reached by detecting the tightening torque.

That is, it is possible to know whether the screw 9 is screwed into the mating member 3 with a predetermined predetermined tightening force due to the hardness of the material of the mating member 3 or the like only by detecting the seated state by the distance measuring means 2. Absent. On the other hand, when the shut-off control of the motor 5 is performed only by the tightening torque, for example, the mating member 3 has a node or the like and reaches a predetermined tightening torque during screwing, and the motor 5 is shut off and seated. May not be. Therefore, as described above, after the seating or immediately before seating is detected by the distance measuring means 2, the motor 5
The tightening control of the control unit 6 is performed until the torque reaches a predetermined torque by detecting the tightening torque of the bit 11 which is the output shaft of the device, so that the screw 9 is automatically seated and screwed with a predetermined predetermined tightening force. The motor 5 can be shut off.

In order to detect that the predetermined tightening force has been reached, various conventionally known detection methods can be adopted. For example, it is detected as follows.

Here, the tightening force can be generally estimated as follows.

W = F.L = F. (R..theta.) F = W / (r..theta.) = (W / r). (1 / .theta.) Where W = work load (striking energy), F = Tightening force, L = moving distance, r = radius of anvil, θ = rotation angle of anvil for each impact.

According to the above equation, when the work amount: W and the anvil radius: r are constant, the rotation angle of the anvil for each impact:
The tightening force F can be calculated by calculating θ.

The estimated tightening force is experimentally estimated from the motor rotation speed and the striking FG pulse edge output in consideration of the battery voltage and the speed controller.

As a result, the estimated tightening force = K · (motor rotation speed ² / between striking FG
The number of pulses-the number of pulses for the hammer rotation). The motor rotation speed is 10m
FG pulse number between s, pulse number for hammer rotation = 65,
K = 31.

Therefore, as shown in FIGS. 1, 2 and 5, a frequency generator as a rotation speed detecting means of the bit 11 which is an output shaft for generating a frequency signal proportional to the rotation speed of the motor 3 in the rotary tool 1. 23 (FG) is provided, the frequency signal generated by the frequency generator 23 is waveform-shaped,
A tightening force detection circuit determines how much tightening torque is generated by shaping and outputting a pulse signal having a pulse width corresponding to the rotation speed of the bit 11 by the waveform shaping circuit and performing arithmetic processing based on the pulse signal. The tightening force estimation unit 28 provided at 27 is used for estimation. Based on the estimated tightening force (estimated tightening torque) estimated by the tightening force estimator 28, a predetermined calculation to be described later is performed to automatically determine the completion of tightening by the shutoff determiner 30 and shut the rotation of the motor 5. It is supposed to turn off.

To determine the shutoff, for example, first screw 9
The estimated torque peak value up to a constant rotation (for example, 5 rotations) is detected, and after the constant rotation (5 rotations), a value obtained by adding a value (for example, +6) to this estimated peak value is set as the lower limit threshold.

Then, the rate of change of the torque (two-time differential number) is obtained, and when the rate of change of the torque reaches less than 0, the lower limit threshold value of the estimated torque exceeds a predetermined value (for example, 26). If the lower limit threshold value of the estimated torque is larger than a predetermined value, it is estimated that the mating member 3 is a hard material, and when the lower limit value of the estimated torque value is reached, the shutoff determination unit The rotation of the motor 5 is shut off by automatically estimating the completion of tightening by 30. On the other hand, the rate of change of torque (the second derivative) is calculated,
When the rate of change of the torque reaches less than 0, it is determined whether the lower limit threshold value of the estimated torque exceeds a predetermined value (for example, 26), and the lower limit threshold value of the estimated torque is the predetermined value. If it does not exceed, the mating member 3 is presumed to be a soft material, and further tightening has no tightening effect. Immediately after that, the shutoff determination unit 30 automatically estimates the completion of tightening to rotate the motor 5. To shut off.

As described above, the seating or immediately before seating is detected by the distance measuring means 2, and after the seating or immediately before seating is detected by the distance measuring means, the tightening torque of the output shaft of the motor 5 is detected to obtain a predetermined torque. By performing control to tighten up to, the motor 5 is seated and has a predetermined tightening force, and the motor 5 is shut off, whereby the seat can be seated and the predetermined tightening force can be obtained.

Further, the control unit 6 controls the motor 5 so that the motor 5 is stopped when the torque reaches the predetermined torque as described above, and a predetermined time after the motor 5 is stopped, the motor 5 is rotated for a further fixed time. It may be controlled. With this configuration, after the seat is seated and the predetermined tightening force is obtained, the retightening can be further performed to a certain degree, so that the more reliable tightening can be performed.

FIG. 6 shows another embodiment of the distance measuring means 2. That is, in the embodiment shown in FIG.
Is composed of a CCD camera 14 and a light 15 for illumination. That is, the body 12 of the rotary tool 1 is provided with the CCD camera 14 and the light 15 for illumination, and the light 1 for illumination is provided.
The object 5 is illuminated with 5, and the screw 9 at the tip of the rotary tool 1 and the shadow 50 of the bit 11 are illuminated so that the CCD camera 1
4, the size and length of the shadow 50 is monitored, and when the shadow 50 becomes a predetermined size or less (or more), a screw 9 is attached to the seat surface 4.
The control section 6 controls the shutoff of the motor 5 when it is determined that the vehicle has been seated. The size and shape of the screw 9 to be used are registered in advance in the CPU of the control unit 6 or the like.

FIG. 7 and FIG. 8 show another embodiment of the distance measuring means 2. In the present embodiment, an example in which the contact detecting means 16 with the seat surface 4 is provided at the tip of the bit 11 provided at the tip of the body 12 of the rotary tool 1, and the contact detecting means 16 is used as the distance measuring means 2 is described. It is shown. For example, a deformable soft contact detecting means 16 such as soft rubber is projected from the side surface of the tip portion of the bit 11 toward the front, and the soft contact detecting means 16 deformable when seated hits the seating surface 4 and is shown in FIG. The seat is detected by bending in the direction of the arrow. In this case, the contact detecting means 16 is made of a material such as soft rubber so that the contact detecting means 16 does not damage the mating member 3. FIG. 8A shows a state of the contact detection means 16 provided on the bit 11 as seen from above before sitting, and FIG. 8B shows a state as seen from above after sitting.

FIG. 9 shows still another embodiment of the distance measuring means 2. A pressure sensor 18 is provided behind the speed reducer 17 that decelerates the rotation of the motor 5 and transmits the rotation to the bit 11. The pressure sensor 18 serves as the distance measuring means 2.
In this embodiment, when the screw 9 is pressed against the mating member 3 while holding the screw 9 by the bit 11 at the tip of the rotary tool 1, the pressing force of the bit 11, which is the output shaft, is applied to the pressure sensor 18. Then, the detection signal is converted into an electric signal, and when the detected value reaches a predetermined value, it is determined that the vehicle is seated, and the control unit 6 controls the shutoff of the motor 5. In this way, the mating member 3 of the rotary tool 1 is made by the pressure sensor 18 provided at the rear of the speed reducer 7.
The seating can be reliably detected by detecting the pressing force to the side. However, as shown in FIG. 9B, since it is possible to strongly press the rotary tool 1 toward the mating member 3 side at the time of initial startup, it is necessary to provide a region that is not detected during that period (about 1 to 2 seconds). .

FIG. 10 shows still another embodiment of the distance measuring means 2. In the present embodiment, the pressing force detecting means 19 is provided on the surface of the grip 13 of the rotary tool 1 opposite to the protruding direction of the bit 11 (that is, the rear surface of the grip 13), and the pressing force detecting means 19 is used as the distance measuring means. It is set as 2. Then, the grip 13 is grasped by hand and the rotary tool 1
When the screwing operation is performed while pressing against the mating member 3 side, the pressing force for pressing the rotary tool 1 by gripping the grip 13 is detected by the pressing force detection means 19,
The detection signal is converted into an electric signal, and when the detection value reaches a predetermined value, it is determined that the vehicle is seated, and the control section 6 performs shutoff control of the motor 5. Also in this embodiment, FIG.
Since it is considered that the rotary tool 1 is strongly pressed against the mating member 3 side at the time of initial startup as in 0 (b), it is necessary to provide a region that is not detected during that period (about 1 to 2 seconds).

It is also possible to combine the various distance measuring means 2 described above to perform seating detection. In this case, rotation is performed so that an operator can select any distance measuring means 2 by work. The type tool 1 may be provided with a switch means such as a dial so that the mode can be selected.

[0049]

As described above, in the invention according to claim 1 of the present invention, the rotary tool is provided with the distance measuring means, and the distance measuring means provides the seating surface of the mating member and the tip of the rotary tool. Since a control unit is provided for detecting that a predetermined distance has been reached and determining that it is seated and stopping the rotation of the rotary tool, when the screw is screwed into the mating member by the rotary tool,
The distance measuring means detects that the seat surface of the mating member and the tip of the rotary tool have reached a predetermined distance, determines that the screw is seated on the seat surface of the mating member, and stops the motor. Whether it is hard or soft, seating can be detected with a simple configuration, and overtightening and premature fastening of screws can be prevented.

In addition to the effect of the invention according to claim 1, in the invention according to claim 2, a plurality of distance measuring sensors forming distance measuring means are provided, and a plurality of distance measuring sensors are provided. Providing a notifying means for detecting the inclination of the rotary tool with respect to the seat surface by the difference in the distance between the detected seat surface of the mating member and the tip of the rotary tool, and notifying when the angle is not a predetermined angle with respect to the seat surface. Therefore, if the screw is tilted and screwed in, it can be notified by the notification means, and the screwing work can be stopped or the screw tilt can be corrected and the work can be continued. There is no danger of tilting and screwing. Also, since the rotary tool can be screwed at a right angle or a substantially right angle to the seat surface without being tilted and used,
The distance measurement sensor provided in the rotary tool can accurately measure the distance between the seat surface and the rotary tool, and the seating of the screw on the seat surface can be reliably detected.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, since the informing means for indicating the tilt direction of the rotary tool is provided, the rotary tool is tilted. When it is used, it is possible to know in which direction it is tilted, and based on this, it is possible to easily correct the posture, and it is possible to screw it in accurately without tilting.

Further, in the invention described in claim 4, in addition to the effect of the invention described in claim 1, since the judgment of the distance measuring means is turned off at the time of the reverse rotation of the motor, the screwing is mistaken or redoing. It is possible to loosen or unscrew the screw once screwed in to reverse, and to turn off the motor when the seating is detected by the distance measuring means, but the rotary tool It does not hinder the use as.

Further, in the invention described in claim 5, in addition to the effect of the invention described in claim 1, there is provided a switch capable of manually turning off the detection by the distance measuring means. When continuously rotating in reverse, or when using a special bit, it can be used with the detection of the distance measuring device turned off,
Even if the motor is shut off when the seating is detected by the distance measuring means, it is possible to select various usage forms of the rotary tool.

In addition to the effect of the invention described in claim 1, in the invention described in claim 6, distance measuring means is provided to the rotary tool in order to vary the detection distance by the distance measuring means. Since it is movably attached, it can be easily handled by moving the distance measuring means when screwing in a little deeper.

In addition, in the invention described in claim 7, in addition to the effect of the invention described in claim 1, the body part having a bit for rotating a screw at its tip intersects the body part. Since the rotary tool is formed by projecting the grip in the direction and the distance measuring means is arranged on the surface of the body of the rotary tool on the side where the grip is projected, when working at a corner or a corner of a wall. The distance measuring means does not hit the wall or other objects, and
The distance measuring device is not located between the position of the line of sight and the tip of the bit, and the distance measuring device by providing the distance measuring device between the position of the line of sight and the tip of the bit interferes with the efficiency of the screw tightening work. Can be prevented from falling, and the screwing target point can be prevented from being mistaken, and the operability of the rotary tool does not deteriorate even if the motor is shut off when the seating is detected by the distance measuring means. It is a thing.

In the invention according to claim 8, the rotary tool is provided with distance measuring means, and the distance measuring means causes the seating surface of the mating member and the tip of the rotary tool to have a predetermined distance. Control to stop the rotation of the rotary tool where the tightening torque of the output shaft of the motor becomes a predetermined tightening force after detecting that Since a portion is provided, the distance measuring means detects just before the seating of the screw, and further tightens until it reaches a predetermined tightening force from the seating or immediately before seating, and stops the rotation with a predetermined tightening force. The seat can be reliably seated and a predetermined tightening force can be obtained.

According to the invention of claim 9, in addition to the effect of the invention of claim 8, the motor is stopped when a predetermined torque is reached, and a predetermined time after the motor is stopped for a predetermined time. Since the motor is rotated for the additional tightening of, after seating and reaching the predetermined tightening force,
A certain amount of retightening is possible and reliable screwing is possible.

Further, in the invention according to claim 10,
In addition to the effect of the invention described in claim 1, a distance measuring means is constituted by a CCD camera and a light, an object is illuminated by the light, and the shadow of the screw and the bit at the tip of the rotary tool is lighted up, thereby the CCD camera The image is taken, and the distance between the seat surface and the tip of the rotary tool is measured by the size and length of the shadow, so C
The CD camera and the light can detect the seating, and the CCD camera can be used to sample the detailed data of the screw tightening work.

Further, in the invention of claim 11,
In addition to the effect of the invention described in claim 1, a bit is provided at the tip of the rotary tool, and contact detecting means for contacting with the seat surface is provided at the tip of the bit, and the contact detecting means serves as distance measuring means. The seating can be easily detected by the contact detecting means contacting the seat surface.

Further, in the invention of claim 12,
In addition to the effect of the invention described in claim 1, a pressure sensor is provided behind the speed reducer for decelerating the rotation of the motor and transmitting the rotation to the bit, and this pressure sensor serves as the distance measuring means. With the pressure sensor provided at the rear, the pressing force of the rotary tool to the mating member side can be detected to easily and reliably detect the seating.

Further, in the invention according to claim 13,
In addition to the effect of the invention according to claim 1, a rotary tool is constructed by projecting a grip in a direction intersecting with the body from a body having a bit for rotating a screw at a tip thereof. Since the pressing force detecting means is provided on the surface opposite to the protruding direction and the pressing force detecting means is the distance measuring means, the pressing force detecting means provided on the grip detects the pressing force of the rotary tool to the mating member side. The seating can be detected easily and surely.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a rotary tool of the present invention.

FIG. 2 is an overall block diagram of the same as above.

FIG. 3 is an operation explanatory view of an embodiment in which a plurality of distance measuring sensors of the same are provided.

FIG. 4 is an explanatory diagram showing an example in which the tilt of the rotary tool is notified by the monitor of the same.

FIG. 5 is a block diagram showing seating detection determination of the above.

FIG. 6 is an explanatory view showing another embodiment of the above distance measuring means.

FIG. 7 is an explanatory view showing still another embodiment of the above distance measuring means.

8A is a plan view of a bit portion before seating in the embodiment of FIG. 7, and FIG. 8B is a plan view of a bit portion after seating.

FIG. 9 (a) is an explanatory view showing still another embodiment of the distance measuring means of the above, and FIG. 9 (b) is a graph showing seating detection.

FIG. 10 (a) is an explanatory view showing still another embodiment of the distance measuring means, and FIG. 10 (b) is a graph showing seating detection.

[Explanation of symbols]

1 rotary tool 2 Distance measuring means 3 Opponent member 4 seat 5 motor 6 control unit 7 ranging sensor 8 Notification means 9 screws 10 switches 11 bits 12 torso 13 grip 14 CCD camera 15 lights 16 Contact detection means 17 reducer 18 Pressure sensor 19 Pressing force detection means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomohiro Hosokawa             1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works Co., Ltd.             Inside the company F-term (reference) 3C038 AA01 BC02 CC04 CC06 EA02                       EA03

Claims (13)

[Claims] 1. A rotary tool comprising a distance measuring means, which detects that the seating surface of a mating member and the tip of the rotary tool have reached a predetermined distance by the distance measuring means and judges that the rotary tool is seated. A rotary tool comprising a control unit for stopping the rotation of the tool. 2. A rotary tool provided with a plurality of distance measuring sensors constituting distance measuring means, and a difference in distance between a seating surface of a mating member and a tip of the rotary tool detected by the plurality of distance measuring sensors. 2. The rotary tool according to claim 1, further comprising an informing means for detecting an inclination of the seat surface with respect to the seat surface and notifying when the seat surface is not at a predetermined angle. 3. The rotary tool according to claim 2, further comprising an informing means for indicating a tilt direction of the rotary tool. 4. The rotary tool according to claim 1, wherein the determination of the distance measuring means is turned off when the motor rotates in the reverse direction. 5. The rotary tool according to claim 1, further comprising a switch capable of manually turning off the detection by the distance measuring means. 6. The rotary tool according to claim 1, wherein the distance measuring means is movably attached to the rotary tool in order to vary the detection distance by the distance measuring means. 7. A rotary tool is constructed by projecting a grip in a direction intersecting with the body from a body having a bit for rotating a screw at its tip, and a grip of the body of the rotary tool is projected. 2. The rotary tool according to claim 1, wherein distance measuring means is arranged on the surface on the side where it is formed. 8. The rotary tool is provided with a distance measuring means, and the distance measuring means detects that the seat surface of the mating member and the tip of the rotary tool have reached a predetermined distance, and determines that the tool is seated or immediately before sitting. Then, after this seating or immediately before seating is detected by the distance measuring means,
A rotary tool comprising: a control unit for stopping the rotation of the rotary tool such that the tightening torque of the output shaft of the motor becomes a predetermined tightening force. 9. The rotary tool according to claim 8, wherein the motor is stopped when a predetermined torque is reached, and the motor is rotated for a predetermined time after the motor is stopped for a predetermined time. 10. A distance measuring means is constituted by a CCD camera and a light, the object is illuminated by the light, the shadow of the screw and the bit at the tip of the rotary tool is lighted up, and the image is taken by the CCD camera. The rotary tool according to claim 1, wherein the distance between the seat surface and the tip of the rotary tool is measured by the length. 11. The rotary tool according to claim 1, wherein a bit is provided at the tip of the rotary tool, and a contact detecting means for contacting with a seat surface is provided at the tip of the bit, and the contact detecting means serves as distance measuring means. Rotary tool. 12. A pressure sensor is provided behind a speed reducer for decelerating the rotation of a motor and transmitting the rotation to a bit, and the pressure sensor serves as distance measuring means.
The rotary tool described. 13. A surface of the grip opposite to the protruding direction of the bit, which constitutes a rotary tool by protruding a grip in a direction intersecting with the body from a body having a bit for rotating a screw at its tip. 2. The rotary tool according to claim 1, wherein a pressing force detecting means is provided on the base, and the pressing force detecting means is a distance measuring means.