JP5353516B2 - Portable tools - Google Patents

Description

  The present invention relates to a handheld portable tool provided with a light for illuminating a work site, and more particularly to a portable tool capable of automatically performing on / off control of a light.

  Handheld portable tools equipped with lights such as LEDs for illuminating work sites are widely used. In these portable tools, a switch for turning on the light is provided at an arbitrary position of the housing, and the light is turned on when the operator presses the switch. The light is turned off automatically when the operator presses the switch again or turns on using a timer after a predetermined time has elapsed.

  The portable tool that is turned on and off by the operator is bothersome because the operator needs to turn it on and off, and it may forget to turn off the light after the work is finished. In that case, power is consumed wastefully. In particular, in portable tools using rechargeable batteries, the problem of power consumption due to forgetting to turn off is serious. On the other hand, with the method of turning off the light automatically after a certain period of time after the light is turned on, the time until the light is automatically turned off is reduced from a few minutes to over a dozen minutes in order to prevent the light from suddenly turning off during work preparation such as alignment There are many cases where the setting is made, and there is a fear that power is consumed wastefully.

  In order to solve the above-mentioned problem, a method is known in which the lighting of the light is linked with the motor start switch (trigger switch), the light is turned on at the start of the motor, and the light is turned off at the stop of the motor. ing.

  As another method, Patent Document 1 provides an independent illumination switch for turning on the light inside the cover body, and elastically deforms the cover body by the gripping force of the hand when the operator grips the gripping portion. An illuminating device for a power tool that turns on a light by turning on a switch is disclosed. In Patent Document 1, the switch is turned off when the operator removes his / her hand from the gripper, and the light is automatically turned off.

Japanese Patent No. 3998920

  In Patent Document 1, since the illumination switch is provided at a position different from that of the trigger switch, there is a problem that a wiring to the illumination switch is required and the manufacturing cost increases. Also, if the operator does not grip the grip part other than the handle part properly, the illumination switch will not turn on, so that the lighting switch will not turn on when the grip part is not grasped properly, such as for alignment work etc. There was a problem. Furthermore, since the illumination switch is turned on by elastically deforming the cover body by the gripping force of the hand when the operator grips the gripping portion, unnaturalness of the gripping state of the gripping portion appears.

  The present invention has been made in view of the above background, and an object thereof is to provide a portable tool capable of turning on a light by a simple operation.

  Another object of the present invention is to provide a portable tool capable of automatically turning off a light with a simple operation.

  Still another object of the present invention is to provide a portable tool that can prevent the light from being turned off and remain on after the work is completed.

 Of the inventions disclosed in the present application, typical features will be described as follows.

 According to one aspect of the present invention, there is provided a motor, a transmission unit that transmits the rotational force of the motor to transmit the rotational force or the striking force to the tip tool, a housing that houses these, and a light that illuminates the work material. The portable tool includes a sensor that detects vibration or inclination of the housing, and is configured to control lighting of the light based on the output of the sensor. For this reason, a control unit for monitoring the output of the sensor is provided, and the control unit monitors the output of the sensor and turns on the light when detecting vibration of a specific acceleration of the housing or a predetermined inclination of the housing. . The sensor is preferably provided in the vicinity of the motor in the housing.

 According to another feature of the invention, the motor is a brushless motor, a substrate on which an inverter circuit for controlling the brushless motor is mounted is provided in the housing, and the sensor is mounted on the substrate. A control unit for controlling the inverter circuit is provided, and the control unit for motor control and the control unit for light control can be shared. Mounting the sensor on the board may be directly mounted by soldering or screwing the sensor on the board, or by pulling the wiring from the board and fixing the acceleration sensor near the board You may make it mount indirectly. When the motor is not activated, the control unit turns on the light when the portable tool detects a specific pattern of vibration or inclination.

 According to still another aspect of the present invention, the control unit detects a vibration when the motor is activated and turns off the light. In addition, the control unit may be configured to turn off the light after a predetermined time has elapsed since turning on using a timer. When the light is turned off, it is preferable to gradually reduce the illuminance of the light. In this way, lighting of the light is performed by detecting vibration generated when the tool body is swung up, down, left and right without starting the tool body, and turning off the light detects vibration when the motor is started. Automatically turn off.

  According to the first aspect of the present invention, the sensor for detecting the vibration or the inclination of the housing is provided, and the lighting of the light is controlled based on the output of the sensor. Alternatively, the light can be turned on (without moving the hand).

  According to the invention of claim 2, the control unit monitors the output of the sensor and turns on the light when detecting the vibration of the specific acceleration of the housing or the predetermined inclination of the housing. Operability is improved. Furthermore, since it is not necessary to provide a separate switch for lighting the light, the electrical wiring can be simplified.

  According to the invention of claim 3, since it is provided in the vicinity of the handle portion constituting a part of the housing, the vibration or acceleration when the tool body is lifted by gripping the handle portion or shaken intentionally is effective. Can be detected.

  According to the invention of claim 4, since the sensor is mounted on the substrate, the sensor can be mounted on or connected to an existing substrate such as a substrate for an inverter circuit of a motor, and an increase in the number of components is suppressed. be able to.

  According to the fifth aspect of the present invention, the control unit turns on the light when the portable tool detects vibration or inclination of a specific pattern in a state where the motor is not activated. Therefore, it is possible to automatically turn on the light by detecting a specific movement of moving the portable tool, and to provide a portable tool that is easy to use.

  According to the invention of claim 6, the control unit detects vibration when the motor is started and turns off the light. Therefore, when the light is not necessary after the alignment is completed and the work is started. Lights can be turned off quickly, and wasteful power consumption can be reduced.

  According to the seventh aspect of the present invention, since the control unit turns off the light after a predetermined time has elapsed since it was turned on using the timer, the portable tool was returned (placed without starting the motor after the light was turned on) ) Even in this case, the light can be surely turned off.

  According to the invention of claim 8, since the light is turned off by gradually reducing the illuminance, the operator can easily recognize the situation where the light is turned off.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a longitudinal cross-sectional view which shows the structure of the hammer drill by the Example of this invention. 3 is a block diagram showing a circuit of a drive control system of a motor 2. FIG. It is a flowchart which shows the control procedure of lighting of 6 and light extinction by this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the present specification, description will be made assuming that the front-rear and up-down directions are the directions shown in FIG.

  FIG. 1 is a longitudinal sectional view showing the structure of a hammer drill 1 according to an embodiment of the present invention. The hammer doris 1 uses a motor 2 as a drive source, a striking mechanism unit 4 that transmits the striking force of the motor 2 to the tip tool 11 via the air spring 3a by the piston 3, and the torque of the motor 2 to the tip tool 11 The rotation transmission mechanism unit 5 for transmitting to the housing and a housing for housing them. In this embodiment, the housing is mainly composed of a rear housing 9 and a front housing 10. The rear housing 9 has a left and right divided structure, and these are fixed by screwing. The front housing 10 has a cylindrical integrated structure continuous in the circumferential direction. The rear housing 9 is substantially L-shaped when viewed from the side, and houses the motor 2, the control circuit board 7, the trigger switch 14, and the like. A front housing 10 is connected to the front side of the rear housing 9, and the impact mechanism 4 and the rotation transmission mechanism 5 are accommodated in the front housing 10. The front housing 10 is provided with a side handle 16. In addition, a protector 13 made of an elastic synthetic resin is covered on the outer peripheral side of the front housing 10. A change lever 22 is provided below the front housing 10. By turning the change lever 22, it is possible to switch to one of three operation modes of “striking only”, “striking + rotation”, and “spinning only”.

  A handle portion 9b extends from the body portion 9a for housing the motor 2 of the rear housing 9 in a substantially perpendicular direction. A trigger switch 14 is provided inside the handle portion 9b and directly below the body portion 9a, and the trigger operation portion 14a is provided so as to protrude forward from the handle portion 9b. A power cord 15 for supplying, for example, AC 100V commercial power is connected to the lower portion of the handle portion 9b.

  A light holding portion 9c is formed on the upper front side of the body portion 9a of the rear housing 9, and a light 6 made of a light emitting diode (LED) or the like is provided there. The light 6 is used to irradiate the work place when working in a dark place, is supplied with power from the control circuit board 7, and is controlled to be turned on or off by a control unit described later.

  The motor 2 is a brushless DC motor, and for a motor having a Hall IC 18 that detects the position of the rotor 2a of the motor 2 by detecting the position of the permanent magnet mounted on the rotor on the rear side of the motor 2. A substrate 17 is provided. The rotating shaft 2c of the motor 2 is rotatably held by two bearings 23a and 23b. The bearing 23 b is held by a holder portion 9 d that is integrally formed on the inner wall side of the rear housing 9. A circuit board 7 on which a control unit for controlling the rotation of the motor 2, an inverter circuit, and the like is mounted is provided in the body unit 9a on the rear side of the holder unit 9d and above the handle unit 9b.

  An inverter circuit for controlling the brushless DC motor 2 and a control circuit (control unit) for controlling the entire hammer drill 1 are mounted on the control circuit board 7. These circuits will be described later. To do. Further, the control circuit board 7 is provided with an acceleration sensor 8 that characterizes the present embodiment. The acceleration sensor 8 is called, for example, a piezoelectric acceleration sensor, and measures acceleration using a phenomenon (piezoelectric effect) in which a voltage is generated when a piezoelectric element (not shown) inside the acceleration sensor 8 is distorted. A setting input panel 12 for setting the number of revolutions of the motor 2 and inputting other setting information is provided above the body portion 9a of the rear housing 9.

  FIG. 2 is a block diagram showing a drive control system circuit of the motor 2. The motor 2 is a so-called inner rotor type constituted by a three-phase brushless DC motor, and includes a rotor 2a constituted by including a plurality of sets (two sets in the present embodiment) N poles and S poles. In order to detect the rotational position of the rotor 2a, the stator 2b composed of the star-connected three-phase stator windings U, V, and W are arranged at predetermined intervals in the circumferential direction, for example, at an angle of 60 °. Three Hall ICs 18 are provided. Based on the rotational position detection signals from these Hall ICs 18, the energization direction and time for the stator windings U, V, W are controlled to rotate the rotor 2a. The Hall IC 18 is provided on the front side of the motor substrate 17 at a position facing the rotor 2a (see FIG. 1).

  The inverter circuit 31 mounted on the control circuit board 7 includes six switching elements Q1 to Q6 connected in a three-phase bridge format. The gates of the switching elements Q1 to Q6 are connected to a control signal output circuit 46 mounted on the control circuit board 7, and the drains or sources of the six switching elements Q1 to Q6 are star-connected stator windings. Connected to U, V, W. As a result, the six switching elements Q1 to Q6 perform a switching operation by the switching element drive signals (drive signals such as H4, H5, and H6) input from the control signal output circuit 46, and are applied to the inverter circuit. Is supplied to the stator windings U, V, and W as three-phase (U-phase, V-phase, and W-phase) voltages Vu, Vv, and Vw. In this embodiment, AC voltage is input via the power cord 15, but DC power is supplied to the inverter circuit 31 via a rectifier circuit 30 (not shown).

  Of the switching element drive signals (three-phase signals) for driving the gates of the switching elements Q1 to Q6, three negative power supply side switching elements Q4, Q5, and Q6 are converted to pulse width modulation signals (PWM modulation signals) H4, H5, By changing the pulse width (duty ratio) of the PWM modulation signal based on the detection signal of the trigger operation amount (stroke) of the trigger switch 14 by the arithmetic unit 41 supplied as H6 and mounted on the control circuit board 7 The power supply amount to the motor 2 is adjusted, and the start / stop of the motor 2 and the rotation speed are controlled.

  Here, the PWM modulation signal is supplied to any one of the positive power supply side switching elements Q1 to Q3 or the negative power supply side switching elements Q4 to Q6 of the inverter circuit 31, and the switching elements Q1 to Q3 or the switching elements Q4 to Q6 are operated at high speed. As a result, the power supplied to each of the stator windings U, V, W is controlled from the DC voltage by switching. In this embodiment, since the PWM modulation signal is supplied to the negative power supply side switching elements Q4 to Q6, the electric power supplied to each stator winding U, V, W by controlling the pulse width of the PWM modulation signal. Can be adjusted to control the rotation speed of the motor 2.

  The hammer drill 1 is provided with a forward / reverse switching lever 21 for switching the rotational direction of the motor 2, and the rotational direction setting circuit 42 switches the rotational direction of the motor 2 every time a change in the forward / reverse switching lever 21 is detected. The control signal is transmitted to the calculation unit 41. Although not shown, the calculation unit 41 is a central processing unit (CPU) for outputting a drive signal based on the processing program and data, a ROM for storing the processing program and control data, and for temporarily storing data. RAM, a timer, and the like.

  The control signal output circuit 46 forms a drive signal for alternately switching predetermined switching elements Q1 to Q6 based on output signals of the rotation direction setting circuit 42, the rotor position detection circuit 43, and the rotation angle detection circuit 44. The drive signal is output to the inverter circuit 31. As a result, the predetermined windings of the stator windings U, V, and W are alternately energized to rotate the rotor 2a in the set rotation direction. In this case, the drive signal applied to the negative power supply side switching elements Q4 to Q6 of the inverter circuit 31 is output as a PWM modulation signal based on the output control signal of the applied voltage setting circuit 49. The creation of the PWM modulation signal by the control signal output circuit 46 is performed by storing necessary control data in the ROM memory in advance and reading it according to the clock signal and using it as PWM creation data. In response to the output control signal of the applied voltage setting circuit 49, the pulse width (duty ratio) of the PWM modulation signal is varied.

  The current supplied to the motor 2 is measured by the current detection circuit 48, and the value is fed back to the calculation unit 41 so as to be adjusted to a set current value. The PWM modulation signal may be applied to the positive power supply side switching elements Q1 to Q3. Although not shown, a temperature sensor for measuring the temperature of the switching element may be provided in the inverter circuit 31 so that the temperature of the switching element or its surroundings is always monitored. When it is determined that the temperature has risen above a preset reference value, the calculation unit 41 is preferably configured to issue a warning and limit or stop the rotation of the motor 2.

  Further, the output signal of the acceleration sensor 8 is input to the calculation unit 41, and the calculation unit 41 analyzes the output signal to output a control signal to the light lighting control circuit 45 to turn on or off the light 6. And a signal instructing to turn on or off the light 6 is output to the light lighting circuit 45. The light lighting circuit 45 turns on or off the light 6 according to the output signal of the calculation unit 41.

  Next, a control procedure for turning on and off the light 6 is performed with reference to FIG. When the power cord 15 of the hammer drill 1 is connected to the outlet, the control unit 40 is activated and the calculation unit 41 waits for a signal from the acceleration sensor 8 (step 51). In this state, the operator can set the light-off method using the setting input panel 12. For example, you can select either the method of detecting the vibration when the tool body is activated and turning it off, or the method of turning off when the lighting time is set and the set time is reached. 12 is input. In addition to the lighting time, it is also possible to use the function of detecting vibration to continue lighting while detecting the vibration when the tool body is activated, and to turn off the tool body when the vibration is eliminated. However, if the operator does not set it, the system automatically stands by by detecting the vibration when the tool body is activated and turning it off. Further, since the light 6 is not necessary for daytime work or work in a bright place, the operator can forcibly turn off the light control.

  Next, the calculation unit 41 determines whether the operator has instructed “lighting on” via the setting input panel 12 (step 52). When the lighting of the light 6 is instructed, the method according to the present embodiment is not used, and the method of manually controlling the lighting and extinguishing of the light 6 is the same as in the prior art, so the process proceeds to step 58.

  Next, the calculation unit 41 determines whether or not the setting of “method for detecting vibration when the tool body is activated and turning it off” is selected as the extinguishing method by the operator. If not selected, the process proceeds to step 59 (step 53).

  In step 54, it is determined whether or not vibration is detected by the acceleration sensor 8, and if not detected, the standby state is continued as it is. If detected, the calculation unit 41 outputs a signal for instructing the light lighting circuit 45 to turn on. Then, the light 6 is turned on, and a timer for counting the time to turn off the light 9 is started (step 55). The vibrations detected at this time are vibrations when the operator lifts the main body, vibrations when the tip tool 11 is pressed against the work material, and the operator intentionally moves the tool main body in a specific direction such as front, rear, left and right. This is vibration generated when the motor 2 is swung, and is generated when the motor 2 is not activated. The type of vibration detected by the acceleration sensor 8 can be determined by the calculation unit 41 comparing the output waveform of the acceleration sensor 8 with the vibration waveform pattern stored in advance in the ROM or the like. As the output waveform of the sensor 8, a vibration waveform, a frequency, or the like can be used. When the operator picks up the hand, the vibration waveform is one large waveform, and the frequency is low-frequency vibration.

  After the light 6 is turned on, it is determined in step 56 whether or not vibration for turning off the light 6 has been detected. If not detected, the calculation unit 41 has timed out from the timer value (whether predetermined lighting time has ended). If the time is not over, the process returns to step 54. At this time, if no new vibration is detected, the standby state is continued with the light 6 turned on (steps 56 and 57). If a new vibration is detected, the timer for counting over time is reset and counted again. Start (steps 54, 55).

  When the time is exceeded in step 57 or when vibration for turning off the light 6 is detected in step 56, the calculation unit 41 outputs a signal for instructing the light lighting circuit 45 to turn off and turns off the light 6. (Step 63).

  On the other hand, if the extinguishing method is not set in step 53, the process proceeds to step 59, and the control unit 41 sets the lighting time. This lighting time is “time from when the light 6 is turned on until it is automatically turned off”, and can be arbitrarily set at intervals of, for example, several seconds to several minutes. The setting method can be input by the operator via the setting input panel 12, but if there is no input, a predetermined default value (for example, 5 minutes) may be set.

  Next, in step 60, it is determined whether or not vibration is detected by the acceleration sensor 8, and if not detected, the standby state is continued as it is. If detected, the arithmetic unit 41 instructs the light lighting circuit 45 to turn on. Is output to turn on the light 6 (steps 60 and 61). The vibration detected at this time is the same as the vibration detected in step 54. Next, the calculation unit 41 counts the lighting time of the light 6 using a timer, determines whether or not the lighting time has exceeded the set time set in step 59, and if so, proceeds to step 63 and turns on the light 6 The light is turned off (steps 62 and 63). In step 62, if the lighting time does not exceed the set time set in step 59, the process returns to step 60 and waits until it exceeds (step 62).

  Note that when the light 6 is turned off in step 63, the light is not suddenly turned off, but the light supplied to the light 6 can be gradually lowered to gradually turn off the illuminance. As a result, even in a dark place where assistance by another light is necessary, the next operation can be started while the light is gradually turned off. Even if the operator makes a mistake in setting and wants to change it unexpectedly, correction can be made during this time.

  As described above, since the operator does not need a special operation for turning on or off the light 6 in the present embodiment, the light 6 is turned on without releasing the hand from the tool body. can do. In addition, since the operator can arbitrarily select the light-off method, it is possible to reliably turn off the light according to the preference of the worker, and it is possible to prevent the light from being forgotten to be turned off after the work is finished.

  As mentioned above, although demonstrated based on the Example which shows this invention, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, in the above-described embodiments, the description has been made based on the example of the hammer drill, but the present invention is not limited to the hammer drill, and the portable power tool such as an impact driver, an electric drill, a grinder, a circular saw, a nailing machine, Or if it is a portable tool using other motive power, it can apply widely.

  Further, in the above-described embodiment, the vibration detection and the lighting and extinguishing of the light are controlled using the arithmetic unit 41 that controls the inverter circuit 31. However, the present invention is not limited to this configuration, and the acceleration sensor 8, the light lighting circuit 45, The light 6 may be configured by a circuit independent of the control unit 40. Further, in the above-described embodiment, the piezoelectric acceleration sensor is fixed to the control circuit board 7. However, instead of the piezoelectric acceleration sensor, other acceleration sensors, vibration sensors, or sensors for detecting some movement are used as the control circuit board. 7 or other parts.

DESCRIPTION OF SYMBOLS 1 Hammer drill 2 Motor 3 Piston 3a Air spring 4 Impact mechanism part 5 Rotation transmission mechanism part 6 Light 7 Inverter circuit 8 Acceleration sensor 9 Rear housing 9a (Rear housing) Body part 9b (Rear housing) Handle part 10 Front housing 11 Tip Tool 12 Setting input panel 13 Protector 14 Trigger switch 14a Trigger operation section 15 Power cord 16 Side handle 17 Motor board 18 Hall IC 21 Forward / reverse switching lever 22 Change lever 23a, 23b Bearing
DESCRIPTION OF SYMBOLS 30 Rectifier circuit 31 Inverter circuit 40 Control part 41 Operation part 42 Rotation direction setting circuit 43 Rotor position detection circuit 44 Rotation angle detection circuit 45 Light lighting circuit 46 Control signal output circuit 48 Current detection circuit 49 Applied voltage setting circuit

Claims (8)

A portable tool having a motor, a transmission portion for transmitting the rotational force of the motor to transmit the rotational force or the striking force to the tip tool, a housing for accommodating these, and a light for illuminating the work material,
A sensor for detecting vibration or tilt of the housing;
A portable tool that controls lighting of the light based on an output of the sensor. A control unit for monitoring the output of the sensor;
The control unit monitors the output of the sensor and turns on the light when detecting vibration of a specific acceleration of the housing or a predetermined inclination of the housing. The portable tool described.   The portable tool according to claim 1, wherein the sensor is provided in the vicinity of a handle portion that constitutes a part of the housing. The motor is a brushless motor, and a substrate on which an inverter circuit for controlling the brushless motor is mounted is provided in the housing.
The portable sensor according to claim 1, wherein the sensor is mounted on the substrate.   3. The portable device according to claim 2, wherein the control unit turns on the light when the portable tool detects vibration or inclination of a specific pattern in a state where the motor is not activated. 4. tool.   The portable tool according to claim 5, wherein the control unit detects vibration when the motor is activated and turns off the light.   The portable tool according to claim 5, wherein the control unit turns off the light after a predetermined time has elapsed since it was turned on using a timer.   The portable light according to any one of claims 1 to 6, wherein the light is turned off by gradually decreasing the illuminance.

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