JP2010094757A - Power tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool capable of being set at any angles and disabling operation at an unintentional angle by providing a function to automatically restrict operation when the angle is not the predetermined angle. <P>SOLUTION: The power tool includes an inclination sensor 5 detecting inclination of a shaft of the tool 4, and a control device 6 controlling not to operate the tool 4 when the data output by the inclination sensor 5 is outside the predetermined range. The tool operation is disabled if the tool does not match the axis of a bolt erected with a predetermined angle, for example. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a power tool using a pneumatic motor or an electric motor such as an air driver or an electric screwdriver, for example, and it can be confirmed that the angle is at a predetermined angle with respect to a workpiece. It is related with the power tool which restricts.

  For example, when tightening a nut with a power tool against a bolt with a buried end and protruding tip, if the bolt axis does not match the nut axis, the nut is tightened diagonally, breaking the screw There is a problem of end. For this reason, it is necessary to make the axis | shaft of a volt | bolt and a nut correspond, and to enter the process of fastening.

  Alternatively, when the tap is raised, if the axis of the pilot hole and the axis of the tap do not coincide with each other, there is a problem that the tap does not turn as the tap advances and the tap cannot be raised to the end. Similar problems occur when dies are processed.

  Thus, when performing the process which tightens a screw or produces a screw, it is necessary to hold | maintain the axis | shaft of a tool at a predetermined angle.

  For this reason, as disclosed in Patent Document 1, a rotating body is attached to an electric driver so that the electric driver does not deviate from a desired angle due to its gyro effect.

Or the thing which attached the jig | tool which guides to an electric drill driver so that it may become perpendicular | vertical with respect to a process surface as disclosed in patent document 2 was developed.
JP 2002-59370 A JP 2003-103409 A

  However, the conventional power tools disclosed in both of the above-mentioned patent documents are suitable, for example, when a plurality of bolts are all set up vertically and a nut is screwed into each of them. However, it is not at all suitable when, for example, a nut is screwed into a plurality of bolts erected at various angles while the axes are aligned.

  Moreover, although what was disclosed by patent document 2 has no problem when a tool is applied perpendicularly to the surface, it cannot be used at other angles.

  The present invention pays attention to the above points, and can be set to any angle, and has a function of automatically restricting the operation when the angle is not a predetermined angle, so as not to operate at an inadvertent angle. It is intended to provide a power tool capable of this.

  There is a tilt sensor that detects the tilt of the tool axis, and a control device is provided to control the tool so that it does not operate when the data output from the tilt sensors is outside the specified range. It was made not to operate unless it matched the axis of bolts etc.

  Since the power tool of the present invention is configured as described above, the operation of the tool is not performed when the inclination of the axis of the tool deviates from a predetermined value. For this reason, the problem that the tool is inclined with respect to the workpiece is eliminated.

  That is, for example, when a box spanner is attached to a tool, a nut is fitted therein, and the nut is screwed into a standing bolt, the inconvenience of screwing the nut diagonally with respect to the bolt can be eliminated. .

  Furthermore, for example, when a tap is set up in a hole that has been drilled in advance, the tool will not operate if the hole does not match the axis of the tap when the tap is attached to the tool and the tap is inserted into the hole. This eliminates the inconvenience of getting a tap in.

  Therefore, even if it is a beginner's work, even a beginner can do the work without a mistake. In particular, when the screw is tightened diagonally, the correction is difficult, and when the nut is tightened diagonally to the bolt, it is necessary to replace it with a new bolt. When the tap is set obliquely with respect to the hole, there is no method other than re-making a large-sized hole, and when a large-sized hole cannot be made, there is no countermeasure.

  When the screws are tightened diagonally in this way, it is difficult to deal with simple work mistakes, and it is significant that the present invention can eliminate such mistakes.

  According to the first aspect of the present invention, a tool such as a drill chuck, a driver bit, or a nut box is rotationally driven by a motor such as an electric motor or a pneumatic motor, and detects the inclination of the axis of the tool. A power tool having a tilt sensor, and having a control device that controls the tool not to rotate when data output from the plurality of tilt sensors is outside a predetermined range, If the data is set in advance, the operation is limited when the angle does not coincide with the angle.

  Hereinafter, embodiments of the power tool of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of a power tool according to the present invention.

  The air impact driver 1 is supplied with compressed air from a compressor (generally not shown) through a pressure tube 2, and the user pushes the trigger 3 with a finger to rotate the tool 4 at the tip.

  A biaxial tilt angle sensor 5 is provided at the end of the air impact driver 1, and the biaxial tilt angle sensor 5 measures the tilt of the axis of the tool 2 in the two-axis directions of the X-axis direction and the Y-axis direction. As the biaxial tilt angle sensor 5, for example, the one disclosed in Japanese Patent No. 3944509 can be used.

  The trigger 3 and the biaxial tilt angle sensor 5 are connected to a control device 6, and the output signal of the control device 6 is connected to an air solenoid valve 7 provided in the middle of the pressure-resistant tube 2. That is, the operation of the air impact driver 1 is restricted when the air solenoid valve 7 is opened and closed by the output signal of the control device 6 and closed.

  FIG. 2 is a circuit block of the control device 6. A central processing unit (hereinafter referred to as “CPU”) 8 has a keyboard 9 for inputting a set angle and the like, a read-only memory (hereinafter referred to as “ROM”) 10 in which an operation program of the CPU 8 is stored, and data and a keyboard in the middle of computation. 9 is connected to a readable / writable memory (hereinafter referred to as “RAM”) 11 for storing the set angle data inputted from 9.

  Further, the CPU 8 receives X-axis data and Y-axis data output from the biaxial tilt angle sensor 5, and receives a half pull signal and a full pull signal from the trigger 3. The output terminal of the CPU 8 outputs an open / close signal for the air solenoid valve 7.

  A flowchart representing the operation of the power tool of the present invention having the above-described configuration is shown in FIG. A description will be given on the assumption that a nut is screwed onto several bolts standing at a predetermined angle.

  First, a necessary box spanner or the like is attached to the tool 2 at the tip of the air impact driver 1. In other words, a box spanner that fits the size of the nut to be tightened will be installed.

  When the control device 6 is turned on, the operation starts in step 1. Next, in step 2, the input of set angle data and allowable value data is awaited. If there is an input, the set angle data and allowable value data are stored in RAM 11 in step 3.

  That is, data representing the angle of the erected bolt and data on the deviation of the tilt angle allowed when a nut is tightened on the bolt are input. In this process, a predetermined angle and an allowable value for tightening the nut are set. After this, the nut tightening operation is started.

  The user attaches a nut to the box spanner, holds the air impact driver 1 in his hand, applies the nut 1 to the standing bolt, and pulls the trigger 3 slightly. As a result, a half pull signal is sent from the trigger 3 to the control device 6. That is, the process waits for the trigger 3 signal in step 4 and proceeds to the next step 5 when the half-draw signal is input.

  In step 5, the control device 6 measures the inclination angle of the air impact driver 1 based on the X-axis data and the Y-axis data output from the biaxial inclination angle sensor 5.

  After this measurement, it is determined in step 6 whether the inclination angle of the air impact driver 1 is within the range of the allowable value input in step 2 with respect to the predetermined value input in step 2.

  If it is within the allowable range, it is determined in step 7 whether or not the trigger 3 is completely pulled, that is, whether or not it is fully pulled. If it is fully pulled, the air solenoid valve 7 is opened in step 9. In the air impact driver 1, compressed air is sent from the compressor through the pressure tube 2, and the tool 4 at the tip rotates.

  If the measured tilt angle data is outside the allowable range, the process proceeds to step 8 and the control device 6 outputs an alarm. As a result, the user recognizes that the angle of the air impact driver 1 is out of the predetermined value, and adjusts the angle again. That is, the process of the control device 6 returns to step 6 and the user repeats the operations of step 6 and step 8 until the angle of the air impact driver 1 falls within the allowable value.

  Accordingly, when the angle of the air impact driver 1 is out of the allowable value, the air impact driver 1 does not rotate, and the nut is prevented from being screwed obliquely with respect to the bolt.

  In the above example, we explained the work of tightening the nut on the bolt that was erected. However, when you drill a hole (under hole) in the workpiece and set the tap in the under hole, attach the tap to the tool. In this case, the problem that the tap is screwed diagonally can be solved.

  Further, in the above embodiment, a so-called pneumatic tool using air as a power tool is taken as an example, but an electric tool may be used instead. In this case, it is preferable to replace the air solenoid valve 7 with a relay that opens and closes the connection between the motor of the power tool and the power source.

  In particular, since the power tool of the present invention can set the processing angle in advance, it can be used easily even by a beginner of work, and does not require skill of work.

  The power tool of the present invention has no mistake even for beginners because it does not operate even if it tries to work at an angle exceeding the allowable value by inputting the angle of the object to be machined in advance and the allowable value of the error of the angle. You can do the work.

It is a block diagram which shows Example 1 of the power tool of this invention. It is a block diagram which shows an example of the electric circuit of the power tool of this invention. It is a flowchart which shows operation | movement of the control apparatus of the power tool of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air impact driver 2 Pressure | voltage resistant tube 3 Trigger 4 Tool 5 Axis inclination angle sensor 6 Control apparatus 7 Air solenoid valve 8 CPU
9 Keyboard

Claims (4)

A tool such as a drill chuck, a driver bit, or a nut box is rotationally driven by a power source, and has a tilt sensor that detects the tilt of the axis of the tool, and the data output by the tilt sensor is out of a predetermined range. A power tool having a control device for controlling so as not to rotate the tool. The power tool according to claim 1, wherein a predetermined value of inclination and an allowable range of inclination are input, and it is determined whether or not the data from the inclination sensor is within the allowable range. The power tool according to claim 1, wherein the tool is driven by air. The power tool according to claim 1, wherein the tool is electric.
The power tool according to claim 1.

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