JP2006095626A - Automatic tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic tool which can suitably set the direction of a working tool with respect to a section to be operated, through simple operation. <P>SOLUTION: A main body of an electric impact trench 10 has a tool shaft on which a rotary tool 36 is mounted, a motor for rotating the tool shaft, and non-contact distance detecting sensors 60a, 60b, 60c for detecting distances to three locations on a surface plate. A nut 18 mounted on a hexagonal socket portion 56 of the rotary tool 36 is screwed onto a bolt perpendicularly protruding from the surface plate. Then an angle which the tool shaft forms with the surface plate is obtained based on distances L1, L2, L3 detected by the non-contact distance detecting sensors 60a to 60c, respectively, and if the angle falls in a suitable perpendicular range, an interlock to the motor is released, and a positional indicator 86 is lighted up. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automatic tool that includes a work tool such as a tightening tool and a driving unit that rotates the work tool, and acts on a work part by driving the work tool.

  According to an automatic tool such as an impact wrench, bolts and nuts can be efficiently tightened by automatically rotating the tool. When screwing and tightening a nut to a bolt using a handy type impact wrench, tighten the nut with the nut inserted into the tip socket of the attachment tool attached to the tool shaft of the impact wrench. After making it contact | abut to a front-end | tip part, an operation switch is operated and an attachment tool is rotated. As a result, the nut is screwed to the bolt and fastened to the engaged object with a predetermined torque.

  By the way, when the nut is brought into contact with the tip of the bolt, the worker performs the work while confirming the posture of the attachment tool visually or with a sense of the hand. When the posture of the attachment tool is inappropriate, there is a concern that the nut does not properly engage with the bolt and the nut or the screw thread of the bolt is crushed.

  In order to properly screw the bolt and nut, a nut runner that measures the distance to the end face of the nut with a plurality of distance sensors provided inside the socket and confirms that the nut is properly stored has been proposed. (For example, refer to Patent Document 1). In addition, in order to improve the accuracy of screw tightening torque, an electric driver has been proposed in which a detection rod for detecting the position of the screw is provided and the rotation of the motor is temporarily stopped immediately before the screw is seated based on the signal of the detection rod. (For example, refer to Patent Document 2).

JP 2000-176852 A Japanese Utility Model Publication No. 4-128167

  By the way, according to the nut runner described in the above-mentioned Patent Document 1, it can be confirmed that the nut is normally attached to the socket portion, but the screwed state between the nut and the bolt cannot be confirmed. Eventually, it is inefficient because the operator needs to manually pre-screw the nut to the bolt in advance. In addition, the sensor for detecting the position of the nut needs to use a special sensor of an extremely small size in order to be provided inside the socket, and since the socket rotates, the sensor signal is transmitted to the signal processor. Is very difficult.

  Further, in general automatic tools as well as impact wrench, it is necessary to set a rotating work tool in an appropriate direction with respect to a work part.

  The present invention has been made in consideration of such problems, and an object thereof is to provide an automatic tool capable of setting a rotating work tool in an appropriate orientation with respect to a work part by a simple operation. To do.

An automatic tool according to the present invention includes a tool shaft to which a work tool is attached,
A main body comprising driving means for rotating the tool shaft;
A non-contact distance detecting means for detecting a distance to at least three locations on a reference surface provided on the main body and provided with a work portion on which the work tool acts;
When an angle formed between the tool axis and the reference surface is obtained based on each distance from the reference surface to the main body obtained by the non-contact distance detection means, and the angle is an appropriate range value set A reference surface angle determination unit that outputs an appropriate angle signal to
It is characterized by having.

  By using the distance to at least three locations on the reference surface detected by the non-contact distance detecting means, the angle formed by the tool axis and the main body is obtained, so that the non-contact state is maintained with respect to the work part. However, it is possible to easily determine whether or not the work tool is at an appropriate angle with respect to the work part. Further, the main body portion and the tool axis can be set to an appropriate orientation based on the angle appropriate signal that is the determination result.

  Furthermore, having an interlock portion that enables or disables the driving of the driving means based on the appropriate angle signal reliably prevents the work tool from contacting the work portion at an inappropriate angle. be able to.

  Furthermore, when an indicator for displaying that the angle is within the appropriate range value is provided based on the appropriate angle signal, the operator can easily grasp the posture of the electric rotary tool, and the operation can be performed. It becomes easier.

  When the work tool is caused to act on the work part by rotating the tool axis, the interlock part stops the drive means based on the angle appropriate signal, so that the work tool is turned on. Even after touching the part, it is possible to maintain a proper posture and perform proper work.

  The non-contact distance detecting means includes three or more sensors, and having an angle adjusting mechanism for adjusting the direction of the sensor, adjusts the direction of the non-contact distance detecting means according to the length of the work tool, The distance to the surface can be set within the proper measurement distance range of the non-contact distance detecting means.

  According to the automatic tool of the present invention, the angle formed between the tool axis and the main body is obtained based on the distance to at least three locations on the reference surface detected by the non-contact distance detecting means. By a simple operation of the state, the work tool can be set in an appropriate direction with respect to the work part.

  Also, by providing an interlock part that enables and disables the rotation drive part based on the angle formed by the tool axis and the main body part, the work tool comes into contact with the work part at an inappropriate angle. It can be surely prevented. Furthermore, by providing an indicator that indicates that the angle of the tool axis is within the appropriate range value based on the appropriate angle signal, the operator can easily grasp the attitude of the electric rotary tool, making operation easier. Become.

  Hereinafter, the automatic tool according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the electric impact wrench (automatic tool) 10 according to the first embodiment can be used for the work of fastening the front plate 12 and the back plate 14 with bolts 16 and nuts 18. The electric impact wrench 10 is used as one system together with the interface amplifier 20, the control sequencer 22 and the interlock controller 24.

  The electric impact wrench 10 includes a cylindrical main body portion 30, a grip portion 32 extending obliquely laterally from the main body portion 30, a tool shaft 34 slightly projecting coaxially from the distal end portion of the main body portion 30, and the A rotary tool (work tool) 36 is detachably attached to the tool shaft 34, and a distance measuring unit 38 is provided so as to surround the periphery of the tip of the main body 30. The electric impact wrench 10 can be operated while gripping the grip portion 32, and is a so-called handy type.

  A power feeding cable 40 is connected to the tip of the grip portion 32, and power is supplied from an external power source. A trigger 41 for finger operation for continuously and variably rotating the speed of the tool shaft 34 is provided at the base portion of the grip portion 32. By pulling the trigger 41 with a finger, the tool is adjusted according to the amount to be pulled. The shaft 34 rotates. The trigger 41 is biased forward (that is, the direction in which the rotary tool 36 extends) by an elastic body (not shown), and when the finger is released from the trigger 41, the trigger 41 returns to the original position, and the tool shaft 34 stops. .

  The main body 30 includes a motor (driving means) 42 that rotates in conjunction with the trigger 41, a speed reducer 44 that reduces and transmits the rotational speed of the motor 42, and an impact function that is connected to the speed reducer 44. The tool shaft 34 is connected to the striking mechanism 46 to perform rotation and striking action. The main body 30 also includes a forward / reverse switch 48 that sets the rotation direction of the tool shaft 34, a torque switch 50 that sets a tightening torque, and a rotation sensor 52 that detects a rotation speed.

  The rotary tool 36 is detachably attached to the tool shaft 34 by a click ball mechanism. The rotary tool 36 has a hollow cylindrical shape and has a hexagon socket portion 56 into which the nut 18 can be inserted inside the tip portion. The hexagon socket 56 may be provided with a magnet for securely holding the nut 18 by suction.

  As shown in FIG. 2, the distance measuring unit 38 has a hexagonal shape when viewed from the front, and has three non-contact distance detecting sensors (non-contact distance detecting means) 60a, 60b radially about the tool shaft 34 at intervals of 120 °. , 60c are provided, and the distance to the object provided in front of each can be detected without contact. Therefore, according to the non-contact distance detection sensors 60a to 60c, when the electric impact wrench 10 is brought close to the bolt 16 while keeping the rotary tool 36 substantially coaxial with the bolt 16, the surface of the surface plate 12 To the electric impact wrench 10 can be detected at three locations.

The non-contact distance detection sensors 60a to 60c are general-purpose laser types, and a laser beam emitted from the light projecting unit 62 and reflected by the surface plate 12 is subjected to a light receiving process by the light receiving unit 64 until the surface plate 12 as an object. The distances L1, L2, and L3 (see FIG. 1) can be measured. The distance range in which the non-contact distance detection sensors 60a to 60c can be measured appropriately is L _{L to} L _H (see FIG. 1).

  As shown in FIG. 3, the non-contact distance detection sensor 60 a is rotatably supported by a support fork 68 protruding forward from the base plate 66, and the tilt angle is adjusted by an angle adjustment mechanism 70 provided on the support fork 68. Is adjustable. That is, the angle adjustment mechanism 70 rotates the worm gear 74, the wheel gear 72 fixed to the non-contact distance detection sensor 60 a, the worm gear 74 held by a part of the support fork 68 and screwed into the wheel gear 72. And a knob 76. The knob 76 is provided behind the base plate 66 and is connected to the rear end portion of the worm gear 74 by a shaft 78 that passes through the base plate 66. Such an angle adjusting mechanism 70 constitutes a so-called worm wheel mechanism, and can adjust the tilt angle of the non-contact distance detecting sensor 60a by rotating the knob 76.

  The non-contact distance detection sensor 60a is provided with an arc-shaped scale 79, and the tilt angle of the non-contact distance detection sensor 60a can be confirmed by the position of the scale 79 indicated by the pointer 80 marked on the side surface of the support fork 68. is there. The other non-contact distance detection sensors 60b and 60c also have the same angle adjustment mechanism 70, and the tilt angle can be adjusted. The angle adjustment mechanism 70 may be configured to be adjustable while the non-contact distance detection sensors 60a to 60c are interlocked by rotating one knob, or may be configured to be automatically adjustable by an appropriate actuator. .

According to the angle adjustment mechanism 70, in accordance with the length L _T of the rotary tool 36 (see FIG. 1), the distance L to the surface plate 12 from the non-contact distance sensor 60a~60c proper measurement distance range _L L ~ It can be adjusted to be L _H. That is, when the rotary tool 36 is long, the angles of the non-contact distance detection sensors 60a to 60c are set so as to be substantially perpendicular to the surface plate 12, and conversely, when the rotary tool 36 is short, appropriate reflection with respect to the surface plate 12 is performed. Is set to be tilted within the range of the angle at which can be obtained, and the distance L to the surface plate 12 can be accurately measured. When there are obstacles such as protrusions on the surface plate 12, the direction of the non-contact distance detection sensors 60a to 60c may be adjusted so that the reflection position of the laser does not overlap the obstacle.

  The non-contact distance detection sensors 60 a to 60 c are covered and protected by a base plate 66 and a cover 82 that can be attached to and detached from the base plate 66. The cover 82 is provided with three side holes 82 a through which the scales 79 can be seen, and front holes 82 b that open to the front of the light projecting parts 62 and the light receiving parts 64 on the front surface.

  By visually observing the scale 79 from the side hole 82a, the tilt angle of the non-contact distance detecting sensors 60a to 60c can be confirmed, and laser light can be projected and received through the front hole 82b. The cover 82 may be designed to improve the visibility of the scale 79 and the bolt 16 as a transparent resin, for example.

  A pilot indicator 84, a posture indicator 86 and a seating distance indicator 88 are provided on the upper surface of the base plate 66. The pilot indicator 84, the posture indicator 86, and the seating distance indicator 88 have different colors (or different shapes) and are easy to identify. The distance measurement unit 38 is connected to the control sequencer 22 via the interface amplifier 20, and the distance signals detected by the non-contact distance detection sensors 60a to 60c are transmitted to the control sequencer 22 and used for calculation processing. The pilot indicator 84, the posture indicator 86, and the seating distance indicator 88 are lit under the action of the control sequencer 22. The signal from the rotation sensor 52 is also supplied to the control sequencer 22.

  The interlock controller 24 can act on the motor 42 of the electric impact wrench 10 and stop the rotation of the motor 42 based on the appropriate angle signal R (see FIG. 4) supplied from the control sequencer 22. .

As shown in FIG. 4, the control sequencer 22 includes a parameter input setting unit 90, a reference surface angle determination unit 92, a torque calculation unit 94, and a seating determination unit 96 that are processing units executed by a program operation. The parameter input setting unit 90, the tilting angle of the non-contact distance sensor 60 a to 60 c, parameters such as the length L _T of the rotary tool 36 can be input. The length _LT is defined with reference to the tip of the tool shaft 34 (see FIG. 1). The torque calculator 94 calculates a torque T generated by the tool shaft 34 based on a speed signal supplied from the rotation sensor 52 and the like. The calculated torque T is recorded in a predetermined file for each work unit.

  The reference surface angle determination unit 92 includes an angle calculation unit 92a and an angle suitability determination unit 92b. The angle calculation unit 92a is provided with the tilt angles of the non-contact distance detection sensors 60a to 60c obtained from the parameter input setting unit 90 and the distances L1 to L3 measured by the non-contact distance detection sensors 60a to 60c (FIG. 5). (See FIG. 5) and the reference position (for example, the tip of the tool shaft 34) with respect to the electric impact wrench 10 of the surface plate 12 with reference to the axis C of the tool shaft 34. A distance L (see FIG. 1) on the axis C of the tool shaft 34 is calculated and supplied to the angle suitability determination unit 92b.

  Among these, for example, when the surface of the surface plate 12 is represented as the surface S1, the inclination angles are such that the distances L1, L2, and L3 to the three points P1, P2, and P3 on the surface S1 are non-contact as shown in FIG. Measured by the distance detection sensors 60a to 60c, the triangular frustum A having the surface S1 as the bottom surface is specified in space. Next, the normal N is calculated from the equation indicating the surface S1. Next, the inclination angle θ formed by the axis C and the normal N passing through the center of gravity of the upper surface S2 and perpendicular to the upper surface S2 is calculated using an inner product or outer product of vectors. In this manner, the angle calculation unit 92a can determine the positions of the surface plate 12 by the three non-contact distance detection sensors 60a to 60c, and uniquely determine the orientation of the surface plate 12.

  The angle suitability determination unit 92b confirms whether or not the calculated inclination angle θ is within a predetermined threshold range, and if it is within the threshold range, the angle appropriateness signal R (see FIG. 4) is transmitted to the interlock controller 24. To supply.

  The inclination angle is expressed as, for example, a yaw angle and a pitch angle, and the processing may be performed based on these two angles. The functions of the angle calculation unit 92a and the angle suitability determination unit 92b in the reference surface angle determination unit 92 do not need to be clearly separated. For example, the tilt angles of the non-contact distance detection sensors 60a to 60c match, It may be determined that the inclination angle θ is appropriate when the distances L1 to L3 measure equidistant positions around the bolt 16 and L1 = L2 = L3.

The seating determination unit 96 monitors and determines whether or not the nut 18 is properly seated on the surface plate 12 based on the calculated torque T and distance L. That is, the distance L when the torque T becomes an appropriate value is compared with the total value of the length L _T (see FIG. 2) of the rotary tool 36 and the protrusion amount L _N of the nut 18, and the difference is a predetermined value. When it is within the threshold range, it is determined that the nut 18 is properly seated, and this information lights the seating distance indicator 88 via the interlock controller 24.

  When the appropriate angle signal R is supplied from the reference surface angle determination unit 92, the interlock controller 24 releases the interlock so that the motor 42 can be driven and the attitude indicator 86 is lit. When the proper angle signal R is not detected, an interlock such as turning off the power of the motor 42 is applied and the attitude indicator 86 is turned off.

  Further, the control sequencer 22 self-diagnose whether or not the operation of each part is operating normally by a predetermined watchdog function, and when it is normal, the pilot indicator 84 is turned on via the interlock controller 24.

According to the electric impact wrench 10 configured as described above, first, the rotary tool 36 is attached to the tool shaft 34, and the nut 18 is attached to the tip of the rotary tool 36. In this case, the parameter input setting unit 90 has predetermined parameters are input in advance, the angle adjusting mechanism 70 is assumed to be appropriately set according to the length L _T of the rotary tool 36. Next, the operator can confirm that the control sequencer 22 is operating normally by visually recognizing that the pilot indicator 84 is lit.

  Next, the electric impact wrench 10 is brought close to the surface plate 12 and the posture is set appropriately, so that the posture indicator 86 is turned on, and the axis C of the tool shaft 34 is perpendicular to the surface plate 12. Is confirmed. In other words, this indicates that the rotary tool 36 and the nut 18 are set in an appropriate direction with respect to the bolt 16, and the nut 18 and the bolt 16 can be smoothly screwed together without being gnawed.

  After confirming that the posture indicator 86 is turned on, the operator operates the trigger 41 to rotate the tool shaft 34 and the rotary tool 36 and screw the nut 18 onto the bolt 16. At this time, when the rotary tool 36 is not set to be perpendicular to the surface plate 12 (that is, when the posture indicator 86 is turned off), the rotation of the rotary tool 36 is prevented by the interlock function. The bolt 16 and the nut 18 are reliably prevented from being gnawed.

  The nut 18 is gradually advanced by being screwed onto the bolt 16. Even during this screwing operation, the interlock function is effective, and the posture of the electric impact wrench 10 is greatly deviated from the initial posture or unnaturally vibrated based on the fact that it is generated by the click ball mechanism. In such a case, the motor 42 can be stopped to prevent the nut 18 and the bolt 16 from being bitten.

The nut 18 is screwed into the bolt 16 and is eventually seated on the surface plate 12 and fastened. At this time, the torque T increases to an appropriate value along with the engagement, and the value of the torque T is calculated by the torque calculation unit 94 and supplied to the seating determination unit 96. Further, the distance L from the tip of the tool shaft 34 to the surface plate 12 is an appropriate value according to the length _LT and the protrusion amount _LN of the rotary tool 36, and the distance L is calculated by the reference surface angle determination unit 92. To the seating determination unit 96. The seating determination unit 96 determines that the nut 18 is properly seated on the surface of the surface plate 12 based on the torque T and the distance L, turns on the seating distance indicator 88, and makes the fastening operation to the worker normally. Notify that it has finished.

  Thereby, for example, even if the torque T is increased to an appropriate value, the distance L is less than the appropriate value when the nut 18 and the bolt 16 are gnawed due to an unexpected situation and the nut 18 does not reach the surface plate 12. Therefore, it is possible to inform the operator that the seating distance indicator 88 is turned off and the fastening is inappropriate. On the other hand, even if the nut 18 reaches the front plate 12 and the distance L is an appropriate value, the seating distance indicator 88 is turned off even when the torque T is not increased to an appropriate value for some reason. The operator can be informed that it is fastened.

  Thereafter, the control sequencer 22 records the torque T in a predetermined file for each work unit.

  As described above, according to the electric impact wrench 10 according to the first embodiment, the nut 18 can be simply and properly screwed and fastened to the bolt 16 protruding vertically from the surface plate 12. In practice, the bolt 16 often projects vertically from the surface plate 12, and the electric impact wrench 10 is applicable in many cases. If the bolt 16 is not perpendicular to the surface plate 12 or the surface plate 12 is curved, a release switch (not shown) provided in the interlock controller 24 is operated to interlock. You can cancel the function.

  The rotary tool 36 used in the electric impact wrench 10 can be a general-purpose product. Furthermore, the nut 18 only needs to be attached to the hexagon socket 56, and it is not necessary to manually preliminarily screw the bolt 16 in advance, so that the screwing and tightening operations can be performed efficiently. Can do.

  The electric impact wrench 10 uses the non-contact distance detection sensors 60a to 60c so that the surface plate 12 can be operated in a non-contact state and is easy to handle, and the rotary tool 36 and the bolt 16 are always exposed. Visibility is good. The non-contact distance detection sensors 60a to 60c may be general-purpose products, but the output sensors 60a to 60c may be further downsized and designed exclusively.

  When the posture of the electric impact wrench 10 is inappropriate, the posture indicator 86 is turned off and the driving of the motor 42 is stopped by the interlock, so that it is possible to perform a reliable screwing and tightening operation without requiring learning. The work efficiency and reliability can be improved.

  Note that transmission and reception of signals among the main body 30, the interface amplifier 20, the control sequencer 22, and the interlock controller 24 of the electric impact wrench 10 may be performed wirelessly.

  Next, an electric impact wrench 10a according to a second embodiment will be described with reference to FIG. The basic configuration of the electric impact wrench 10a is the same as that of the electric impact wrench 10, and the same reference numerals are given to the parts of the mechanism, and detailed description thereof is omitted.

  In the electric impact wrench 10a, a control unit 100 having substantially the same functions as the interface amplifier 20, the control sequencer 22 and the interlock controller 24 provided externally in the electric impact wrench 10 is provided on the upper surface of the main body 30. It is an integrated type with no external components. The electric impact wrench 10 a has a distance measurement unit 102 corresponding to the distance measurement unit 38. The distance measuring unit 102 has an octagonal shape when viewed from the front, and has four non-contact distance detection sensors (non-contact distance detection means) 104a, 104b, 104c and 104d radially and vertically at 90 ° intervals around the tool axis 34. Is provided. These non-contact distance detection sensors 104a to 104d are the same sensors as the non-contact distance detection sensors 60a to 60c, and can detect the distance to the surface plate 12, respectively. The non-contact distance detection sensors 104a and 104c are provided at target positions in the vertical direction, and the non-contact distance detection sensors 104b and 104d are provided at target positions in the horizontal direction.

  Four inclination correction instruction indicators 106a, 106b, 106c, and 106d are provided on the back side of the distance measurement unit 102 in the vertical and horizontal directions, and among these, the inclination correction instruction indicators 106a and 106c are located at target positions in the vertical direction. The inclination correction instruction indicators 106b and 106d are provided at target positions in the horizontal direction. Each of the inclination correction instruction indicators 106a to 106c has an arrow shape pointing outward, and is provided in the vicinity of the back of the non-contact distance detection sensors 104a to 104d in order.

  The control unit 100 tilts the tool shaft 34 with respect to the surface plate 12 based on the four measurement distances supplied from the non-contact distance detection sensors 104a to 104d and the speed signal supplied from the rotation sensor 52 (see FIG. 2). When the angle is calculated and determined to be an appropriate angle (that is, when the surface plate 12 is perpendicular to the rotary tool 36), the attitude indicator 86 is turned on and the motor 42 is interlocked. Such a determination may be determined as an appropriate angle when, for example, all four measurement distances are equal.

  Further, when it is determined that the inclination angle of the electric impact wrench 10a with respect to the surface plate 12 is inappropriate, the control unit 100 indicates one or two of the inclination correction instruction indicators 106a to 106d indicating the direction to be corrected. Lights up. Such determination is made, for example, by comparing the upper distance detected by the non-contact distance detection sensor 104a provided above with the lower distance detected by the non-contact distance detection sensor 104c provided below. If the distance is short, the lower inclination correction instruction indicator 106c may be turned on, and if the lower distance is shorter, the upper inclination correction instruction indicator 106a may be turned on. Further, the right distance detected by the non-contact distance detection sensor 104b provided on the right side is compared with the left distance detected by the non-contact distance detection sensor 104d provided on the left side. The left inclination correction instruction indicator 106d may be lit, and if the left distance is short, the right inclination correction instruction indicator 106b may be lit.

  By turning on the inclination correction instruction indicators 106a to 106d based on such a simple comparison judgment, the operator can very easily confirm and correct the direction in which the attitude of the electric impact wrench 10a should be corrected. The direction is indicated by four directions (ie, the pitch direction and the yaw direction) of up, down, left, and right, so that it is easy to operate intuitively.

  Furthermore, the control unit 100 measures the distance L (see FIG. 1) with reference to the tip end of the tool shaft 34, and the nut 18 is appropriately adjusted with respect to the surface plate 12 based on the distance L and the torque T. Whether or not the user is seated is monitored and determined. When it is determined that the user is properly seated, the seating distance indicator 88 is turned on.

  As described above, according to the electric impact wrench 10 and 10a according to the present embodiment, the tool shaft 34 and the rotary tool 36 can be set in an appropriate direction with respect to the bolt 16 by a simple operation. The nut 18 attached to the 36 hexagon socket portions 56 can be properly screwed and fastened.

  The distance measuring units 38 and 102 may be integrated with the main body 30 or may be detachable. The attaching / detaching mechanism of the rotary tool 36 is not limited to the click ball mechanism, and may be a chuck tightening type.

  Furthermore, the interlock mechanism is not necessarily required, and the operator may determine the angle of the tool shaft 34 only with the posture indicator 86.

  The automatic tool according to the present invention is not limited to the above-described embodiment, and various other configurations can be adopted without departing from the gist of the present invention, such as an electric screwdriver, an electric drill, and an electric polishing tool. Alternatively, the present invention can be applied to an automatic tool that performs work by setting the orientation to be defined with respect to the surface of the workpiece. The drive system is not limited to electric, but may be a fluid drive system such as air.

It is a system diagram showing an electric impact wrench and external devices according to the first embodiment. It is a front view of the electric impact wrench which concerns on 1st Embodiment. It is a perspective view which shows a non-contact distance detection sensor and its angle adjustment mechanism. It is a functional block diagram of a control sequencer. It is explanatory drawing which shows geometrically the relationship between the position of a non-contact distance detection sensor, and the measurement position in a surface plate. It is a perspective view of the electric impact wrench which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10a ... Electric impact wrench 12 ... Surface plate 16 ... Bolt 18 ... Nut 20 ... Interface amplifier 22 ... Control sequencer 24 ... Interlock controller 30 ... Main part 34 ... Tool axis 36 ... Rotary tool 38, 102 ... Distance measurement Unit 41 ... Trigger 42 ... Motor 56 ... Hex socket parts 60a to 60c, 104a to 104d ... Non-contact distance detection sensor 62 ... Light emitting part 64 ... Light receiving part 84 ... Pilot indicator 86 ... Posture indicator 88 ... Seating distance indicator 92 ... Reference Surface angle determination unit 92a ... Angle calculation unit 92b ... Angle suitability determination unit 94 ... Torque calculation unit 96 ... Seating determination units 106a to 106d ... Inclination correction instruction indicator C ... Axis L ... Distance N ... Normal R ... Angle appropriate signal

Claims (5)

A tool axis to which the work tool is attached;
A main body comprising driving means for rotating the tool shaft;
A non-contact distance detecting means for detecting a distance to at least three locations on a reference surface provided on the main body and provided with a work portion on which the work tool acts;
When an angle formed between the tool axis and the reference surface is obtained based on each distance from the reference surface to the main body obtained by the non-contact distance detection means, and the angle is an appropriate range value set A reference surface angle determination unit that outputs an appropriate angle signal to
An automatic tool characterized by comprising: The automatic tool according to claim 1, wherein
The automatic tool further comprising an interlock unit that enables or disables driving of the driving means based on the angle appropriate signal. The automatic tool according to claim 2,
The automatic tool further comprising an indicator indicating that the angle is within the proper range value based on the proper angle signal. The automatic tool according to claim 1, wherein
An automatic tool characterized in that, when the work tool is applied to the work part by rotating the tool shaft, the interlock part stops the driving means based on the angle appropriate signal. The automatic tool according to claim 1, wherein
The non-contact distance detecting means includes three or more sensors, and has an angle adjusting mechanism for adjusting the orientation of the sensors.

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