WO2008013051A1

WO2008013051A1 - Work tool

Info

Publication number: WO2008013051A1
Application number: PCT/JP2007/063696
Authority: WO
Inventors: Masahiro Watanabe; Takeshi Nishimiya
Original assignee: Makita Corporation
Priority date: 2006-07-25
Filing date: 2007-07-09
Publication date: 2008-01-31
Also published as: JP2008023694A

Abstract

[PROBLEMS] A technique effective for smoothing work of a work tool in which a tip tool for processing a workpiece material is driven by a drive motor. [MEANS FOR SOLVING PROBLEMS] In an electric grinder (100), a work mode in an operating state of the drive motor (140) can be set by a predetermined trigger action of a trigger (122) at a main grip (120).

Description

Specification

Work tools

Technical field

The present invention relates to a work tool construction technique.

Background art

Conventionally, for example, Patent Document 1 below discloses an electric grinder configured to drive a rotating turret for performing grinding and grinding operations by an electric drive motor. In this electric grinder, when the operator operates a rotation speed setting knob provided on the upper part of the grinder body, the setting rotation speed of the drive motor is made variable, thereby controlling the rotation of the rotating turret. Is adopted! Speak.

Patent Document 1: Japanese Patent Laid-Open No. 2-262295

Disclosure of the invention

Problems to be solved by the invention

[0003] By the way, in this type of work tool, it is assumed that the operation of adjusting the rotation of the tip tool during the work or the like is performed according to the type of workpiece and the work state of the tip tool. The In such a case, when the electric grinder described in Patent Document 1 is used, when operating the rotation speed setting knob, the worker once holds the finger holding the predetermined holding part of the tool body once. After the release, the rotation speed setting knob is operated, and the work is performed after gripping the grip part again, and it is necessary to change the work posture during the work. Therefore, when designing this type of work tool, a configuration is required that allows the operator to smoothly perform desired settings without changing the work posture during work.

The present invention has been made in view of the above-described points, and is effective for smoothing a machining operation in a working tool in which a tip tool for performing a machining operation on a workpiece is driven by a drive motor. It is an issue to provide a new technology.

Means for solving the problem

[0004] In order to achieve the above object, the invention described in each claim is configured. [0005] A work tool according to the present invention includes at least a main body, a tip tool, a drive motor, a hand grip, a trigger, and a control unit.

The tip tool of the present invention is configured as a tool that is disposed at the tool tip of the main body portion and performs a processing operation of a workpiece, and is used for various operations such as polishing, polishing ij, and cutting. The drive motor of the present invention is housed in the main body, and is configured as a motor that drives the tip tool by supplying power. A mechanism for transmitting the rotational force of the drive motor to the tip tool is appropriately disposed between the drive motor and the tip tool. As the “power source” here, a battery power source mounted on the tool body or an external power source connected to the drive motor through a power cord is used.

The handgrip of the present invention is provided in the main body and is configured as a handgrip that is gripped by an operator when using a tool, that is, a part to which the gripping force (grip force) of the worker is applied. The on-position force that is in the activated state is biased toward the off-position that is in the deactivated state, and the off-position force can be pulled to the on position by one or more fingers of the operator holding the handgrip. Configured as an enabled trigger.

In particular, the control unit of the present invention controls the drive motor to the operating state by pulling the trigger to the on position, and creates the drive motor by operating the trigger to return to the off position. While controlling to a movement release state, it has a function which makes the setting regarding the operation mode of a work tool variable according to the operation mode of the trigger by the operator's finger holding the hand grip. Specifically, regarding the setting related to the working mode of the work tool, the setting related to the operating mode in the operating state of the drive motor or the irradiation device that irradiates the work material The setting relating to the operating mode of the irradiation apparatus corresponds to this. Also, as settings related to the operation mode in the operating state of the drive motor, typically, the rotational speed (rotational speed) and rotational direction of the drive motor in the active state, and the normal rotational speed when the drive motor starts up. It is possible to appropriately set the soft start operation time that gradually increases to the maximum, the timing that defines the upper limit of the current value that is applied to the drive motor, and the timing that the drive motor is energized. According to such a configuration of the work tool according to the present invention, the operator operates the trigger without changing the work posture in the work posture while holding the handgrip, and in the operating state of the drive motor. It is possible to change the setting relating to the operation mode, and thus it is possible to achieve a smooth machining operation.

[0007] The operation mode of the trigger is defined by pulling the trigger to the on position again after the trigger is operated to return the on position force to the off position, or the trigger is turned to the off position force on position. It is preferable to include a predetermined trigger action defined by returning to the off position again after the pull operation. In the work tool according to a further embodiment of the present invention, the control unit sets the rotational speed of the drive motor every time the predetermined trigger action is performed within a predetermined time as a setting relating to the operation mode in the operation state of the drive motor. The configuration has a control mode for switching the setting. That is, in this control mode, the rotational speed setting of the drive motor is switched according to the time required for a predetermined trigger action. As the control mode, typically, settings such as a setting in which the rotational speed of the drive motor is increased stepwise or alternatively to a high rotation side, or a setting that gradually or alternatively decreases to a low rotation side are appropriately adopted. can do. According to such a configuration, it is possible to perform control for switching the rotational speed setting of the drive motor to a desired state according to the time required for a predetermined trigger action.

[0008] Further, in the work tool according to a further aspect of the present invention, the control unit switches the rotation speed setting of the drive motor according to the number of repetitions of the trigger action within a predetermined time with respect to the predetermined trigger action. The control mode is used. As this control mode, typically, as the number of repetitions of the trigger action increases, the drive motor rotation speed is increased stepwise, or the drive motor corresponding to the number of repetitions of the trigger action is increased. Settings such as alternatively selecting the number of revolutions can be adopted as appropriate. According to such a configuration, it is possible to perform control for switching the rotational speed setting of the drive motor to a desired state in accordance with the number of repetitions of a predetermined trigger action within a predetermined time.

[0009] Further, in the work tool according to a further aspect of the present invention, the control unit has a control mode for switching the rotational speed setting of the drive motor in accordance with the operation speed of the predetermined trigger action. It is made. As this control mode, typically, when a switch with sliding resistance is used as a trigger and the operation speed of the trigger action is relatively fast (sliding resistance changes with time), the rotational speed of the drive motor When the operation speed of the trigger function is relatively slow (the time variation of the sliding resistance is small), the drive motor speed is gradually reduced to the low speed side. For example, it is possible to appropriately adopt a setting for selecting the rotational speed of the drive motor corresponding to the operation speed of the trigger action (time change of sliding resistance). According to such a configuration, there is provided a work tool capable of controlling the setting of the rotational speed of the drive motor to a desired state according to the operation speed of a predetermined trigger action.

[0010] Further, in the work tool according to a further aspect of the present invention, the control unit gradually increases the rotational speed to the normal rotational speed when the drive motor is started each time the predetermined trigger action is performed within a predetermined time. The control mode is configured to switch the soft start operation time. As this control mode, typically, when the time required for the trigger action is relatively short, the soft start operation time is changed, and when the time required for the trigger action is relatively long, the soft start operation is performed. Settings that maintain time, settings that selectively select the soft start operation time corresponding to the time required for the trigger action, and the like can be appropriately employed. According to such a configuration, it is possible to perform control for switching the soft start operation time of the drive motor to a desired state according to the time required for a predetermined trigger action.

[0011] In the work tool according to a further aspect of the present invention, the control unit includes a current limiter capable of defining an upper limit of a current value energized to the drive motor, and the predetermined trigger action is performed within a predetermined time. Each time it is performed, it has a control mode for switching the operation of the current limiter. As this control mode, typically, when the time required for the trigger action is relatively short, the current limiter switches between the activated state and the non-activated state, and the time required for the trigger action is relative. If the current limiter is long, the setting to maintain the current limiter's operating state or inactive state, or the setting to selectively select the upper limit of the current value corresponding to the time required for the trigger action should be adopted as appropriate. Can do. According to such a configuration, the current limiter is activated according to the time required for a predetermined trigger action. Control to switch to a desired state is possible.

[0012] In the work tool according to a further aspect of the present invention, the control unit includes a lock-on mechanism capable of maintaining the energized state of the drive motor, and according to the number of repetitions of the predetermined trigger action within a predetermined time. Thus, a control mode for switching the operation of the lock-on mechanism is provided. As this control mode, typically, a setting for setting the lock-on mechanism in an activated state or a non-activated state according to the number of times the trigger action is repeated can be appropriately employed. According to such a configuration, it is possible to control the operation of the lock-on mechanism to a desired state according to the number of repetitions of a predetermined trigger action within a predetermined time.

[0013] Further, the work tool according to a further embodiment of the present invention further includes an irradiation device that irradiates the workpiece. The “irradiation device” here includes a wide range of devices that emit light toward the workpiece, and typically includes not only LEDs, lamps and fluorescent lamps that illuminate the workpiece, but also rounds. Lasers used to align black lines on workpieces in saws and other work tools are used as irradiation devices.

[0014] In this work tool, the control unit makes the setting relating to the operation mode of at least one of the drive motor and the irradiation device variable according to the operation mode of the trigger by the finger of the operator holding the handgrip. It is supposed to be configured. Typically, the timing for switching the irradiation device between the irradiation state and the non-irradiation state, the illuminance (degree of brightness) of the irradiation device, and the like can be appropriately set. According to such a configuration, the operator operates the trigger without changing the work posture while holding the hand grip, and operates at least the drive motor and the irradiation device in the operation state of the drive motor. The setting relating to one of the operation modes can be changed, so that the machining operation can be smoothly performed.

[0015] Further, in the work tool according to a further aspect of the present invention, the control unit irradiates the irradiation device every time the predetermined trigger action is performed within a predetermined time as a setting relating to the operation mode of the irradiation device. The control mode is switched between a state and a non-irradiation state. As this control mode, typically, when the time required for the trigger action is relatively short, the irradiation apparatus switches between the irradiation state and the non-irradiation state, and the trigger action is performed. When the time required for the irradiation is relatively long, it is possible to adopt a setting in which the irradiation state or non-irradiation state of the irradiation apparatus is maintained. According to such a configuration, it is possible to provide a work tool that can be controlled to switch the operation of the irradiation device to a desired state according to the time required for a predetermined trigger action by the trigger.

The invention's effect

[0016] As described above, according to the present invention, in a work tool in which a tip tool that performs a machining operation on a workpiece is driven by a drive motor, in particular, in a working state of the drive motor by a predetermined trigger action. By adopting a configuration that enables settings related to the drive motor operation mode and irradiation device operation mode, the operator can set the desired settings without changing the work posture while holding the hand grip. As a result, it has become possible to achieve smooth processing.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a “work tool” of the present invention will be described with reference to the drawings. In the present embodiment, as an example of a work tool, an electric grinder used for polishing and grinding work materials will be described. This electric grinder is also referred to as “disc grinder” or “disc sander”.

FIG. 1 shows the appearance of an electric grinder 100 that is an embodiment of a work tool according to the present invention. As shown in FIG. 1, the electric grinder 100 of the present embodiment is mainly composed of a tool main body 110, a main grip 120, a front grip 130, a drive motor 140, a drive mechanism 150, and a tip tool 160.

[0019] The tool main body 110 is configured to accommodate various electric system parts and mechanical system parts related to driving of the tip tool 160, including the drive motor 140 and the drive mechanism 150, in the housing 112. The drive motor 140 is connected to the tip tool 160 via the drive mechanism 150 and is operated by power supply from an external power source (AC power source 210 described later), and the tip tool 160 is rotationally driven in the operating state. Is done. The drive motor 140 corresponds to “a drive motor that drives the tip tool by power supply” in the present invention. It is also possible to adopt a configuration in which the drive motor 140 is operated by a notch power source mounted on the tool body. Further, the tool main body 110 referred to here constitutes the “main body” in the present invention. The The tool body 110 and the main grip 120 or the front grip 130 may be combined to be called a “main part”.

[0020] The main grip 120 is configured as a handle (also referred to as "main handle" or "rear handle") provided on the rear side (right side in Fig. 1) of the housing 112 of the tool body 110. It is done. The main grip 120 constitutes a portion to which the operator's gripping force (grip strength) extends, and this main grip 120 force corresponds to the “node grip” in the present invention. The main grip 120 is typically gripped by an operator's dominant hand, and includes a trigger 122 for operating the drive motor 140 under the grip.

[0021] The trigger 122 is normally biased to an off position where the drive motor 140 is deactivated, and the operator force holding the main grip 120 overcomes the biasing force. By pulling with a finger to the on position where the drive motor 140 is in the activated state, the trigger switch 122a described later is turned on and the operation of the drive motor 140 is started. Conversely, by releasing (returning) the pulling operation of the trigger 122 by the finger, the trigger 122 returns to the off position with respect to the drive motor 140, and the trigger switch 122a described later is turned off, and the drive motor 140 operation is stopped. The trigger 122 here corresponds to a “trigger” in the present invention. Although details will be described later, in the present embodiment, a configuration in which the operation mode of the drive motor 140 is set according to the operation mode of the trigger 122 by the operator, or a lamp (irradiation device) A configuration is adopted in which settings related to the operation mode are made.

The front grip 130 is configured as a nodule (also referred to as “auxiliary handle” or “front handle”) provided on the front side (left side in FIG. 1) of the tool main body 110. The front drip 130 is configured to extend from the left front portion of the tool main body 110 in the left-right direction of the tool. The front grip 130 is typically gripped by a hand opposite to the operator's dominant hand.

[0023] The tip tool 160 is configured as a rotating member that is rotationally driven when the rotational force of the driving motor 140 is transmitted through the driving mechanism 150, and specifically, a grinding stone, a cutting stone, a multi-purpose tool, and the like. A disk, a flexible grindstone, a diamond wheel, a sanding disk, a wire brush, or the like is appropriately used. The tip tool 160 here is the tool main body 110. A tip tool disposed in the tip region, which corresponds to the “tip tool” in the present invention. Since the operating principle of the electric grinder 100 belongs to a well-known technical matter, the detailed description of the configuration and operation thereof is omitted for the sake of convenience.

Regarding the control system of the drive motor 140, FIG. 2 is referred to. FIG. 2 shows a control circuit 151 constituting the drive mechanism 150 of the present embodiment.

As shown in FIG. 2, the control circuit 151 according to the present embodiment mainly includes an AC power source 152, a control unit (controller) 153, a switch detection unit 154, a setting display unit 155, and a motor drive unit 156. It is made. The control unit 153 is typically configured by a CPU (arithmetic processing unit), an input / output device, a storage device, a peripheral device, and the like. The control unit 153 corresponds to the “control unit” in the present invention. The switch detection unit 154 has a function of detecting the operation of the trigger switch 122a accompanying the operation of the trigger (trigger 122 in FIG. 1) and outputting the detection signal to the control unit 153. The setting display unit 155 is configured as a digital or analog display means. The motor drive unit 156 is configured using a semiconductor switch and has a function capable of controlling the power supplied to the drive motor 140. Based on the input signal from the switch detection unit 154, the control unit 153 outputs a control signal for the drive motor 140 to the motor drive unit 156, while the display signal of the contents related to the control is mechanically or triggered by the trigger operation. Outputs to the setting display unit 155 in conjunction with the electrical type. Thus, based on the operation mode of the trigger 122 by the operator, the rotation speed of the drive motor 140 is controlled to a predetermined setting, and the contents of the setting are displayed on the setting display unit 155.

[0026] The relationship between the operation mode of the trigger 122 by the operator and the setting related to the operation mode of the control target will be described below. In the present embodiment, the relationship is roughly divided into first to fourth embodiments. In the first to fourth embodiments, the setting related to the operation mode of the control target is performed mainly by the control unit 153 described above.

[0027] [First embodiment]

First, according to the first embodiment, the trigger action is performed by pulling the trigger 122 back to the on position after the trigger 122 is turned back to the off position (hereinafter also referred to as “first trigger action”). It is assumed that the rotational speed setting of the drive motor 140 is switched according to the above. For this first embodiment, refer to FIGS. 3 to 7 for the control modes A to E of the drive motor 140. Explained. Each of the control modes shown in FIGS. 3 to 7 is indicated by the relationship between the operation mode related to the first trigger action of the trigger 122 by the operator and the rotational speed setting of the drive motor 140. In addition, in the control modes A to E, the drive motor 140 has the upper limit number of rotations with the second and third rotation numbers sandwiched from the first rotation number that is the lower limit number of rotations with respect to the rotation number setting. Up to 4 speeds, total 4 speeds.

(Control mode A)

In the control mode A of the first embodiment, in conjunction with the first trigger action of the trigger 122, the set rotational speed of the drive motor 140 is stepwise between the first rotational speed and the fourth rotational speed. Changed (also called “shift”). Specifically, as shown in FIG. 3, a timer (not shown) is activated on the condition that the SW ON force is also switched to SW OFF, and counts a predetermined time ΔtO set in advance. Each time the operator performs the first trigger action of the trigger 122 within a predetermined time Δ まで until the rotation speed of the drive motor 140 reaches the fourth rotation speed that is the upper limit rotation speed, The set number of revolutions increases by one step up to the fourth number of revolutions. In addition, once the set rotational speed of the drive motor 140 reaches the fourth rotational speed, every time the operator performs the first trigger action of the trigger 122 within the predetermined time Δΐ, the set rotational speed of the drive motor 140 is set. The number 4th rotational force also decreases to the 1st rotational speed step by step. In other words, in this control mode Α, the rotation speed setting of the drive motor 140 is switched according to the time required for the first trigger action of the trigger 122, and when the first trigger action is repeated, the first rotation speed force In addition, the step of increasing the rotational speed up to the fourth rotational speed and the step of decreasing the rotational speed setting of the fourth rotational speed to the first rotational speed are sequentially repeated. On the other hand, in this control mode A, if the first trigger action of the trigger 122 is not performed within the predetermined time Δΐ, the rotation speed setting of the drive motor 140 is maintained or reset to the initial setting. Is done.

This control mode 相当 corresponds to “a control mode in which the rotation speed setting of the drive motor is switched every time the trigger action is performed within a predetermined time”. As an example of changing this control mode A, the number of rotations of the drive motor 140 depends on the trigger action in which the trigger 122 is pulled back to the off position after the trigger 122 is pulled to the on position. It is also possible to adopt a control mode that switches settings. [0029] (Control mode B)

In the control mode B of the first embodiment, as in the case of the control mode A, the set rotational speed of the drive motor 140 is linked to the first rotational speed and the fourth rotational speed in conjunction with the first trigger action of the trigger 122. It is changed step by step between the rotation speeds. Specifically, as shown in FIG. 4, the timer counts a predetermined time ΔtO on the condition that the switch is switched from SW on to SW off. Then, until the set rotational speed of the drive motor 140 reaches the fourth rotational speed, if the operator performs the first trigger action of the trigger 122 within the predetermined time Δΐ, the set rotational speed of the drive motor 140 is reached. However, the 1st rotational force also increases step by step up to the 4th rotational frequency. In addition, once the set rotational speed of the drive motor 140 reaches the fourth rotational speed, if the operator performs the first trigger action of the trigger 122 within the predetermined time Δΐ, the set rotational speed of the drive motor 140 is set. Decreases to the 4th rotation speed and the 1st rotation speed, and then increases to the 1st rotation speed and the 4th rotation speed again. That is, in this control mode と, when the first trigger action of the trigger 122 is repeated, the step of increasing the rotational speed from the first rotational speed force to the fourth rotational speed is repeated. On the other hand, in this control mode Β, when the first trigger action of the trigger 122 is not performed within the predetermined time Δΐ, the rotation speed setting of the drive motor 140 is maintained or reset to the initial setting.

This control mode 相当 corresponds to “a control mode in which the rotational speed setting of the drive motor is switched every time the trigger action is performed within a predetermined time”. As an example of changing this control mode Β, the rotational speed of the drive motor 140 is set according to the trigger action that the trigger 122 is pulled back to the off position after the off position force is also pulled to the on position. It is also possible to adopt a control mode for switching between.

[0030] (Control mode C)

In the control mode C of the first embodiment, in conjunction with the first trigger action of the trigger 122, the set rotational speed of the drive motor 140 is stepped between the first rotational speed and the fourth rotational speed. Be changed. Specifically, as shown in FIG. 5, the timer counts a predetermined time ΔtO on the condition that the switch is switched from SW on to SW off. Then, until the set rotation speed of the drive motor 140 reaches the fourth rotation speed, if the operator repeats the first trigger action of the trigger 122 twice within the predetermined time Δΐ, the set rotation speed of the drive motor 140 is reached. Number 1 is also the first rotational force Increases by 1 step to 2 rpm. Similarly, when the worker repeats the first trigger action three times within the predetermined time AtO, the set rotational speed of the drive motor 140 increases by one step to the third rotational speed as well. When the operator repeats the first trigger action four times within the predetermined time Δΐ, the set rotational speed of the drive motor 140 is increased by one step to the fourth rotational speed. In addition, once the set rotational speed of the drive motor 140 reaches the fourth rotational speed, the operator performs the set rotational speed of the drive motor 140 once within the predetermined time Δΐ so that the set rotational speed of the drive motor 140 becomes the fourth rotational speed. After the force decreases to the first rotation speed in three steps, the first rotation force increases to the fourth rotation speed again in one step according to the number of repetitions of the first trigger function. That is, in this control mode C, the rotation speed of the drive motor 140 is set to any one of the first to fourth rotation speeds according to the number of repetitions of the first trigger action of the trigger 122 within a predetermined time. It will be. On the other hand, in the control mode C, when the first trigger action of the trigger 122 is not performed within the predetermined time Δΐ, the rotation speed setting of the drive motor 140 is maintained or reset to the initial setting.

This control mode C corresponds to “a control mode in which the rotational speed setting of the drive motor is switched according to the number of repetitions of the trigger action within a predetermined time”. As an example of changing this control mode C, the rotation speed of the drive motor 140 is set according to the trigger action that is triggered again when the trigger 122 is pulled to the off position and then to the off position. A switching control mode can also be adopted.

(Control mode D)

In the control mode D of the first embodiment, the set rotational speed of the drive motor 140 is set between the first rotational speed and the fourth rotational speed in conjunction with the operation time required for the first trigger action of the trigger 122. It is changed step by step. Specifically, as shown in FIG. 6, when the time required for the first trigger action of the trigger 122 performed by the operator (hereinafter referred to as “SW off time”) is relatively short, for example, in FIG. In the case of Atl, the set rotational speed of the drive motor 140 increases by one step. On the other hand, when the time required for the first trigger action of the trigger 122 performed by the operator is relatively long, for example, when it is At 2 in FIG. 6, the set rotational speed of the drive motor 140 decreases. That is, in this control mode D, the force for increasing the set rotational speed of the drive motor 140 based on the time required for the first trigger action of the trigger 122, or The key to be lowered will be determined. In effect, a predetermined time is set in advance and the trigger is

When the time required for the first trigger action of 122 is shorter than the predetermined time (in the case of Atl), the set speed of the drive motor 140 is increased by one step, and the time required for the first trigger action of the trigger 122 is preset. If it is longer than the set time (At2), the set rotational speed of the drive motor 140 is decreased by one step. On the other hand, when the first trigger action of the trigger 122 is not performed within a predetermined time, the rotational speed setting of the drive motor 140 is maintained or reset to the initial setting.

This control mode D corresponds to “a control mode in which the rotational speed setting of the drive motor is switched every time the trigger action is performed within a predetermined time”. As an example of changing this control mode D, the rotation speed of the drive motor 140 is set according to the trigger action that the trigger 122 is pulled back to the off position after the off position force is pulled to the on position. It is also possible to adopt a control mode for switching between.

(Control mode Έ)

In the control mode の of the first embodiment, as in the case of the control mode D, the set rotational speed of the drive motor 140 is linked to the first rotational speed and the fourth rotational speed in conjunction with the first trigger action of the trigger 122. It is changed step by step between the rotation speeds. Specifically, as shown in FIG. 7, when the time required for the first trigger action of the trigger 122 performed by the operator is the first time Atl, the rotation speed of the drive motor 140 is the first speed. When the rotation speed is set and the second time At2 is longer than the first time Atl, the rotation speed of the drive motor 140 is set to the second rotation speed. Similarly, when the time required for the first trigger action of the trigger 122 performed by the operator is the third time At3, the rotation speed of the drive motor 140 is set to the third rotation speed, and the third time When the fourth time At4 is longer than At3, the rotation speed of the drive motor 140 is set to the fourth rotation speed. In other words, in this control mode Έ, based on the time required for the first trigger action of the trigger 122, the rotational speed of the drive motor 140 is selectively or alternatively set to one of the first to fourth rotational speeds. Will be. On the other hand, in this control mode 場合, if the first trigger action of the trigger 122 is not performed within a predetermined time, the rotational speed setting of the drive motor 140 is maintained or reset to the initial setting. This control mode 「indicates that“ every time the trigger action is performed within a predetermined time, This corresponds to a “control mode for switching the rotational speed setting of the motor”. As an example of changing this control mode Έ, the rotational speed of the drive motor 140 is set according to the trigger action that the trigger 122 is pulled back to the off position after the off position force is also pulled to the on position. It is also possible to adopt a control mode for switching between.

[0033] [Second Embodiment]

Next, in the second embodiment, the rotational speed setting of the drive motor 140 is switched according to the switch sliding resistance at the time of the first trigger action of the trigger 122. Regarding the second embodiment, it is preferable to use a control circuit of a different form (control circuit 251 shown in FIG. 8) different from the control circuit 151 shown in FIG. In the control circuit 251 shown in FIG. 8, a trigger switch 222a with sliding resistance is adopted as a trigger switch associated with the operation of the trigger (trigger 122 in FIG. 1) instead of the trigger switch 122a shown in FIG. By this trigger switch 222a, the switch sliding resistance at the time of the first trigger action of the trigger 122 is detected. The other components in the control circuit 251 are the same as those in the control circuit 151 shown in FIG.

Regarding the second embodiment, the control modes F to J of the drive motor 140 will be described with reference to FIGS. 9 to 13. Each of the control modes shown in FIGS. 9 to 13 is indicated by the relationship between the sliding resistance in the first trigger action of the trigger 122 2 by the operator and the set rotational speed of the drive motor 140. In the control modes F to J, the sliding resistance value in the first trigger action of the trigger 122 is detected by the above-described trigger switch 22 2a. In addition, in the control modes F to J, the drive motor 140 is set in four stages in total from the first rotation speed that is the lower limit rotation speed to the fourth rotation speed that is the upper limit rotation speed with respect to the rotation speed setting. Have a number of turns. On the other hand, when the first trigger action of the trigger 122 is not performed within the predetermined time, the rotation speed setting of the drive motor 140 is maintained or reset to the initial setting. Each of these control modes F to J corresponds to a “control mode for switching the rotational speed setting of the drive motor in accordance with the operation speed of the trigger action”. As an example of changing the control modes F to J, the rotation speed of the drive motor 140 is changed according to the trigger action in which the trigger 122 is pulled back to the off position after the trigger 122 is pulled to the on position. A control mode for switching the setting can also be adopted. [0035] (Control mode F)

In the control mode F of the second embodiment, the set rotational speed of the drive motor 140 is set to the first rotational speed and the fourth rotational speed in conjunction with the detection of the specified sliding resistance at the time of the first trigger action of the trigger 122. It is changed step by step (also referred to as “shift”) between the rotation numbers. Specifically, as shown in FIG. 9, a timer (not shown) is activated on the condition that the switch has been switched from SW ON to SW OFF, and counts a preset predetermined time ΔtO. Then, until the set rotational speed of the drive motor 140 reaches the fourth rotational speed, the specified sliding resistance value (lOOkQ in Fig. 9) in the first trigger action of the trigger 122 is detected within a predetermined time Δ ΐ. Each time, the set rotational speed of the drive motor 140 increases by one step up to the fourth rotational speed. In addition, after the set rotational speed of the drive motor 140 reaches the fourth rotational speed, every time the specified sliding resistance value in the first trigger action of the trigger 122 is detected within a predetermined time Δΐ. Then, the set rotational speed of the drive motor 140 is lowered step by step to the first rotational speed. That is, in this control mode F, when the rotation speed setting of the drive motor 140 is switched according to the operation speed of the first trigger action of the trigger 122, and the first trigger action of the trigger 122 is repeated, the first trigger action is repeated. The rotational speed setting up step from the rotational speed to the fourth rotational speed and the rotational speed setting down step to the fourth rotational speed force to the first rotational speed are sequentially repeated.

[0036] (Control mode G)

In the control mode G of the second embodiment, as in the case of the control mode F, the set number of rotations of the drive motor 140 is linked to the detection of the specified sliding resistance at the time of the first trigger action of the trigger 122. It is changed stepwise between the first and fourth rotation speeds. Specifically, as shown in FIG. 10, the timer counts a predetermined time ΔtO on condition that the switch is switched from SW on to SW off. Then, until the set rotational speed of the drive motor 140 reaches the fourth rotational speed, the drive motor 140 is detected each time the specified sliding resistance value in the first trigger action of the trigger 122 is detected within the predetermined time Δ 駆動. With the set speed of 140, the first speed force is also increased step by step up to the fourth speed. In addition, once the set rotational speed of the drive motor 140 reaches the fourth rotational speed, every time the specified sliding resistance value in the first trigger action of the trigger 122 is detected within a predetermined time Δΐ. The setting speed of the drive motor 140 is the fourth speed. Force Decreases by 3 steps to the first rotation speed, then increases again by 1 step to the first rotation speed force to the 4th rotation speed. That is, in this control mode G, when the rotational speed setting of the drive motor 140 is switched according to the operation speed of the first trigger action of the trigger 122, and the first trigger action of the trigger 122 is repeated, the first trigger action is repeated. As for the rotational speed force, the rotational speed setting increase step up to the fourth rotational speed is repeated.

[0037] (Control mode H)

In the control mode H of the second embodiment, the set rotational speed of the drive motor 140 is set to the first rotational speed and the fourth rotational speed in conjunction with the number of detections of the specified sliding resistance at the time of the first trigger action of the trigger 122. It is changed step by step between the rotation speeds. Specifically, as shown in FIG. 11, the timer counts a predetermined time ΔtO on the condition that the switch is switched from SW on to SW off. Then, until the set rotational speed of the drive motor 140 reaches the fourth rotational speed, the specified sliding resistance value in the first trigger action of the trigger 122 is repeated twice within a predetermined time ΔtO. In this case, the set rotational speed of the drive motor 140 is increased by one step from the first rotational speed to the second rotational speed. Similarly, when the specified sliding resistance value in the first trigger action is detected three times within a predetermined time ΔtO, the set rotational speed of the drive motor 140 is the second rotational speed force, the third rotational speed. When the specified sliding resistance value in the first trigger action is detected four times within the predetermined time ΔtO, the set rotational speed of the drive motor 140 becomes the third rotational speed. From 1 to 4th speed. In addition, once the set rotational speed of the drive motor 140 reaches the fourth rotational speed, the specified sliding resistance value in the first trigger action is detected once within a predetermined time ΔtO to drive the motor. After the set rotational speed of the motor 140 has decreased to the first rotational speed by three steps, the first rotational force is again decreased according to the number of detections of the specified sliding resistance value in the first trigger action. The number of revolutions increases by one step up to the fourth number of revolutions. That is, in this control mode Ή, the rotational speed setting of the drive motor 140 is switched according to the operation speed of the first trigger function of the trigger 122, and the specified sliding resistance value in the first trigger action of the trigger 122 is changed. Based on the detected number of times, the rotational speed of the drive motor 140 is selectively or alternatively set to one of the first to fourth rotational speeds.

[0038] (Control mode I) In the control mode の of the second embodiment, the set rotational speed of the drive motor 140 is set to the first rotational speed and the fourth rotational speed in conjunction with the change time of the specified sliding resistance at the time of the first trigger action of the trigger 122. It is changed step by step between the rotation speeds. Specifically, as shown in FIG. 12, when the time required for the change of the specified sliding resistance value in the first trigger action of the trigger 122 is relatively short, for example, when it is Atl in FIG. The set speed of drive motor 140 increases by one level. On the other hand, when the time required to change the specified sliding resistance value in the first trigger action of the trigger 122 is relatively long, for example, when it is At2 in FIG. 12, the set rotational speed of the drive motor 140 is one step. Descend. That is, in this control mode D, the number of rotations of the drive motor 140 is increased according to the time required for the change of the specified sliding resistance value in the first trigger action of the trigger 122, that is, the operation speed of the first trigger action. Whether it is raised or lowered is set.

[0039] (Control mode J)

In the control mode J of the second embodiment, as in the case of the control mode I, the set rotational speed of the drive motor 140 is linked to the change time of the specified sliding resistance at the time of the first trigger action of the trigger 122. It is changed stepwise between the first and fourth rotation speeds. Specifically, as shown in FIG. 13, when the time required for the change of the specified sliding resistance value in the first trigger action of the trigger 122 is the first time Atl, the rotational speed of the drive motor 140 is When the first rotation speed is set and the second time At2 is longer than the first time Atl, the rotation speed of the drive motor 140 is set to the second rotation speed. Similarly, when the time required to change the specified sliding resistance value in the first trigger action of the trigger 122 is the third time Δt3, the rotation speed of the drive motor 140 is set to the third rotation speed. In the case where the fourth time At4 is longer than the third time At3, the rotation speed of the drive motor 140 is set to the fourth rotation speed. That is, in this control mode Ί, the rotation speed of the drive motor 140 is one of the first to fourth rotation speeds based on the time required for the change of the specified sliding resistance value in the first trigger action of the trigger 122. It will be set selectively or alternatively.

[0040] [Third embodiment]

Next, in the third embodiment, the first trigger action of the trigger 122 or the trigger 1 In response to a trigger action (also referred to as “second trigger action”) in which the motor 22 is pulled back from the off position to the on position and then back to the off position, the number of rotations of the drive motor 140 It is assumed that the setting other than is switched. The third embodiment will be described with reference to the control mode K to 0 force of the driving motor 140 and FIGS.

[0041] (Control mode Κ)

In the control mode の of the third embodiment, the soft start operation time of the drive motor 140 is set to be changed in conjunction with the first trigger action mode of the trigger 122. Specifically, every time the first trigger action of the trigger 122 is performed within a predetermined time, the set value of the soft start operation time is switched. That is, as shown in FIG. 14, when the time required for the first trigger action of the trigger 122 performed by the operator is relatively short, for example, when it is Atl in FIG. 14, the soft start operation of the drive motor 140 is performed. The time setting is switched between T1 and T2 (> T1). In addition, when the time required for the first trigger action of the trigger 122 performed by the operator is relatively long, for example, at At 2 in FIG. 14, the setting value of the soft start operation time of the drive motor 140 is Set to the same value as the previous soft start operation time setting. For this setting, it is preferable to adopt a configuration in which the setting value of the soft start operation time is stored in a memory or the like and held. The “soft start operation” here is an operation that gradually increases the rotation speed to the normal rotation speed when the drive motor 140 starts up, and the time until the operation is completed is defined as the “soft start operation time”. It is done. On the other hand, in the control mode K, when the first trigger action of the trigger 122 is not performed within a predetermined time, the setting of the soft start operation time is maintained or reset to the initial setting.

This control mode K corresponds to “a control mode in which the soft start operation time for gradually increasing the rotation speed to the normal rotation speed when the drive motor is started every time the trigger action is performed within a predetermined time”. As an example of changing the control mode K, a control mode that switches the setting of the soft start operation time of the drive motor 140 in accordance with the second trigger action of the trigger 122 can be adopted.

[0042] (Control mode L)

In the control mode L of the third embodiment, the driving is performed in conjunction with the switch operation mode of the trigger 122. The operation mode of the current limiter of the dynamic motor 140 is set to be changed. Specifically, every time the second trigger action of the trigger 122 is performed within a predetermined time, the operation mode of the current limiter is switched between the operation state and the operation release state. That is, as shown in FIG. 15, when the time required for the second trigger action of the trigger 122 is relatively short, for example, when it is Atl in FIG. 15, the current limiter of the drive motor 140 is activated. When the time is relatively long, for example, when At 2 in FIG. 15, the current limiter of the drive motor 140 is either in the activated state or the deactivated state. Control to maintain. The electric limiter used in this control mode L has a function of feedback-controlling the actual current so that the current supplied to the drive motor 140 does not exceed a preset predetermined current value in its operating state. On the other hand, in the control mode L, when the second trigger action of the trigger 122 is not performed within a predetermined time, the operation mode of the current limiter is maintained or reset to the initial setting.

This control mode L corresponds to “a control mode in which the operation of the current limiter is switched every time the trigger action is performed within a predetermined time”. As an example of changing the control mode L, a control mode in which the operating mode of the current limiter is switched in accordance with the first trigger action of the trigger 122 can be adopted.

(Control mode M)

In the control mode M of the third embodiment, the light operation mode is set to be changed in conjunction with the switch operation mode of the trigger 122. Specifically, every time the second trigger action of the trigger 122 is performed within a predetermined time, the operation mode of the light is switched between the operation state and the operation release state (non-operation state). That is, as shown in FIG. 16, when the time required for the second trigger action of the trigger 122 is relatively short, the light is switched between the activated state and the deactivated state, and the time is relatively long. In addition, control is performed to maintain the light in either the activated state or the deactivated state. On the other hand, in the control mode M, when the second trigger action of the trigger 122 is not performed within a predetermined time, the operation mode of the light is maintained or reset to the initial setting. The light used in this control mode M is configured as a means for irradiating the tip tool 160 or workpiece when the tool is used. In addition to the light on / off operation, the lighting time and lighting intensity (brightness) In addition to the light control structure, it is also possible to adopt a structure for controlling the operation mode of a laser or a fluorescent lamp used for inking the work material in a work tool such as a circular saw. The light, laser, and fluorescent lamp here constitute an “irradiation device” in the present invention. This control mode M is “whenever the trigger action is performed within a predetermined time, the irradiation device is in an irradiation state and a non-irradiation state. Corresponds to a “control mode for switching between” and “. As an example of changing this control mode M, a control mode in which the operation mode of the light is switched in accordance with the first trigger action of the trigger 122 can also be adopted.

[0044] (Control mode N)

In the control mode N of the third embodiment, the operating state of the drive motor 140 is locked (also referred to as “lock on”) in conjunction with the switch operation mode of the trigger 122, and the lock on state of the drive motor 140 is It is set to be unlocked (also called “lock-off”). Specifically, the drive motor 140 is switched between a lock-on state and a lock-off state according to the number of repetitions of the second trigger action of the trigger 122 within a predetermined time. That is, as shown in FIG. 17, by repeating the second trigger action of the trigger 122 twice within a preset predetermined time Δΐ, the subsequent operation state of the drive motor 140 is locked. Thereafter, the lock-on state of the drive motor 140 is released by performing the second trigger action of the trigger 122 once within a predetermined time Δ Δ set in advance.

This control mode 相当 corresponds to “a control mode in which the operation of the lock-on mechanism is switched according to the number of repetitions of the trigger action within a predetermined time”. As an example of changing this control mode Ν, a control mode is adopted in which the drive motor 140 is switched between the lock-on state and the lock-off state in accordance with the first trigger action of the trigger 122 described above. In

[0045] (Control mode Ο)

In the control mode の of the third embodiment, as in the case of the control mode Ν, the operating state of the drive motor 140 is locked (locked on) in conjunction with the switch operation mode of the trigger 122, and the drive motor The 140 lock-on status is set to unlock (lock-off). Specifically, the second trigger action of trigger 122 is repeated within a predetermined time. Depending on the number of times, the drive motor 140 is switched between a lock-on state and a lock-off state. That is, as shown in FIG. 18, the second trigger action of the trigger 122 is repeated twice within a preset predetermined time Δ 予め, thereby locking the subsequent operating state of the drive motor 140. Thereafter, when a predetermined time set in advance elapses, the lock-on state of the drive motor 140 is automatically released.

This control mode 相当 corresponds to “a control mode in which the operation of the lock-on mechanism is switched according to the number of repetitions of the trigger action within a predetermined time”. As an example of changing this control mode Ο, a control mode is adopted in which the drive motor 140 is switched between the lock-on state and the lock-off state in accordance with the first trigger action of the trigger 122 described above. In

[0046] [Fourth embodiment]

Next, the fourth embodiment is a case where the first embodiment and the third embodiment are combined. Regarding the fourth embodiment, the control mode の of the drive motor 140 will be described with reference to FIG.

[0047] (Control mode Ρ)

The control mode Ρ in the fourth embodiment is a control mode in which a control mode similar to the control mode の in the first embodiment is combined with a control mode similar to the control mode M in the third embodiment. In conjunction with the switch operation mode of the trigger 122, the rotation speed of the drive motor 140 is changed stepwise between the first rotation speed and the fourth rotation speed. The operation mode of the light that irradiates the workpiece is changed.

Specifically, as shown in FIG. 19, regarding the light on / off operation, At 9 is used as the specified time of the second trigger action of the trigger 122, and the rotation speed of the drive motor 140 is changed. Uses A t9 and A tlO (> A t9) as the prescribed times for the second trigger action of trigger 122. If the time required for the second trigger action of the trigger 122 is equal to or less than At9, it is determined that the second trigger action is an operation for switching the light switch on and off, and the light switch Performs on / off switching control. In the form shown in FIG. 19, when the write operation force S matches the light setting, that is, when the switch action by the trigger 122 and the write operation are linked, it is described. [0049] When the time required for the second trigger action of the trigger 122 is larger than At9 and smaller than AtlO, the second trigger action increases the rotational speed of the drive motor 140 stepwise. Control for increasing the set rotational speed of the drive motor 140 step by step. In addition, when the time required for the second trigger action of the trigger 122 is equal to or greater than AtlO, it is determined that the second trigger action is an operation for decreasing the rotation speed of the drive motor 140 step by step. Then, control is performed to decrease the set rotational speed of the drive motor 140 step by step.

As an example of changing the control mode P, the control mode for switching the rotational speed setting of the drive motor 140 in accordance with the second trigger action of the trigger 122 or the first trigger action of the trigger 122 is described. Therefore, it is possible to adopt a control mode that switches the operation mode of the light.

[0050] In the first to fourth embodiments, the set value is held while the trigger 122 pulling operation is released, and the next time the trigger 122 pulling operation is performed, the previous time. It is possible to configure to work according to the set value.

Further, in the first to fourth embodiments, the set value can be reset when the time during which the pulling operation of the trigger 122 is released exceeds a certain time. In the first to fourth embodiments, the set value can be reset when the pull operation of the trigger 122 is released.

In the first to fourth embodiments, it is preferable to adopt a configuration in which the setting display unit 155 displays and outputs a set value. Regarding the configuration for displaying and outputting the set value, the setting display unit 155 described above can be an LED, lamp, display, or the like whose output mode is variable. More specific configurations include a configuration in which the number of LEDs and lamps indicating the set value are turned on or blinking, and a configuration in which information indicating the set value is displayed using colors, letters, numbers, symbols, and the like. On the other hand, with respect to the configuration for outputting the set value as a sound, a speaker whose output mode is variable can be used. As a more specific configuration, there is a configuration in which information indicating a set value is output by a buzzer sound or voice.

In the first to fourth embodiments, in addition to each control mode, it is possible to provide a switching prevention mode for preventing the setting switching itself for the drive motor 140 and the like. wear. In this case, the switching prevention mode can be set by performing a specific operation of the trigger 122 or an operation member different from the trigger 122.

[0051] As described above, according to the present embodiment, the operator operates the trigger 122 while holding the main grip 120 without changing the work posture, and drives the drive motor. It is possible to change the setting relating to the operating mode in the 140 operating states and the setting relating to the operating mode in the operating state of the light, thereby making it possible to facilitate the machining operation.

[0052] (Another embodiment)

It should be noted that the present invention is not limited to the above-described embodiment, and various application examples and modification examples based on the present embodiment can be conceived. For example, the following embodiments to which this embodiment is applied can be implemented.

In the present embodiment described above, an electric grinder used for polishing work or grinding work has been described as an example of a work tool, but the present invention is not limited to an electric grinder. The present invention can be applied to various work tools having a configuration in which a tool can be set in a plurality of drive modes. At this time, regarding the driving method of the tip tool, a configuration in which the tip tool is driven by a rechargeable or drive motor driven by an AC power supply can be employed.

Brief Description of Drawings

FIG. 1 is a diagram showing an external appearance of an electric grinder 100 that is an embodiment of a work tool according to the present invention.

FIG. 2 is a diagram showing a control circuit 151 constituting the drive mechanism 150 of the present embodiment.

FIG. 3 is a diagram showing control relating to control mode A of the first embodiment.

FIG. 4 is a diagram showing control relating to control mode B of the first embodiment.

FIG. 5 is a diagram showing control relating to control mode C of the first embodiment.

FIG. 6 is a diagram showing control relating to control mode D of the first embodiment.

[Fig. 7] Fig. 7 is a diagram showing control relating to a control mode の in the first embodiment.

FIG. 8 is a diagram showing another form of control circuit 251 constituting drive mechanism 150 of the present embodiment. FIG. 9 is a diagram showing control related to a control mode F of the second embodiment.

FIG. 10 is a diagram illustrating control related to a control mode G according to the second embodiment.

[Fig. 11] Fig. 11 is a diagram showing control relating to a control mode の in the second embodiment.

FIG. 12 is a diagram showing control related to control mode I of the second embodiment.

FIG. 13 is a diagram showing control relating to a control mode J of the second embodiment.

FIG. 14 is a diagram showing control relating to a control mode K of the third embodiment.

FIG. 15 is a diagram showing control relating to a control mode L of the third embodiment.

FIG. 16 is a diagram showing control relating to a control mode M of the third embodiment.

FIG. 17 is a diagram showing control relating to a control mode N of the third embodiment.

FIG. 18 is a diagram showing control relating to a control mode O of the third embodiment.

FIG. 19 is a diagram showing control relating to a control mode P of the fourth embodiment. Explanation of symbols

100 Electric grinder (Work tool)

110 Tool body

112 housing

120 Main grip

122 trigger

122a Trigasic

130 Front grip

140 Drive motor

150 Drive mechanism

151 Control circuit

152 AC power supply

153 Controller (Controller)

154 Switch detector

155 Setting display section

156 Motor drive

160 Tip tool 222a Trigger Switch 251 Control Circuit

Claims

The scope of the claims

[1] The main body,

A tip tool disposed at the tool tip of the main body and performing a machining operation of a workpiece; a drive motor housed in the main body and driving the tip tool by power supply;

A hand grip provided on the main body and gripped by an operator when using the tool;

The driving motor is biased toward the on position force that is in the activated state and the off position that is in the deactivated state, and the off position force is moved to the on position by the operator's finger holding the hand grip. A trigger that can be pulled,

While the trigger is pulled to the on position, the drive motor is controlled to be in an operating state, and when the trigger is returned to the off position, the drive motor is controlled to be in an unlocked state, A work tool comprising: a control unit configured to change a setting relating to an operation mode of the work tool according to an operation mode of the trigger by an operator's finger holding the hand grip.

[2] The work tool according to claim 1,

The said control part is a work tool which makes variable the setting regarding the operating mode in the operating state of the said drive motor as a setting regarding the operating mode of the said working tool.

[3] The work tool according to claim 1 or 2,

The operation mode of the trigger is defined by pulling the trigger back to the on position after the trigger is returned from the on position to the off position, or the trigger is moved from the off position to the off position. A work tool comprising a predetermined trigger action defined by being pulled back to the off position after being pulled to the on position.

[4] The work tool according to claim 3,

The work tool according to claim 1, wherein the control unit has a control mode for switching a rotational speed setting of the drive motor every time the predetermined trigger action is performed within a predetermined time.

[5] The work tool according to claim 3,

The work tool having a control mode in which the rotational speed setting of the drive motor is switched according to the number of repetitions of the predetermined trigger action within a predetermined time.

[6] The work tool according to claim 3,

The control tool has a control mode for switching a rotational speed setting of the drive motor according to an operation speed of the predetermined trigger action.

[7] The work tool according to claim 3,

The control unit has a control mode for switching a soft start operation time for gradually increasing the rotation speed to a normal rotation speed when the drive motor is started each time the predetermined trigger action is performed within a predetermined time. Work tool.

[8] The work tool according to claim 3,

The control unit includes a current limiter capable of defining an upper limit of a current value supplied to the drive motor, and switches the operation of the current limiter every time the predetermined trigger action is performed within a predetermined time. A work tool having a control mode.

[9] The work tool according to claim 3,

The control unit includes a lock-on mechanism capable of maintaining the energized state of the drive motor, and a control mode for switching the operation of the lock-on mechanism according to the number of repetitions of the predetermined trigger action within a predetermined time. A work tool characterized by having.

[10] The work tool according to claim 1,

Furthermore, an irradiation device for irradiating the workpiece is provided,

The said control part is a work tool which makes variable the setting regarding the operation aspect of the said irradiation apparatus as a setting regarding the operation aspect of the said work tool.

[11] The working tool according to claim 10 or 11,

The work tool characterized in that the control unit has a control mode in which the irradiation device is switched between an irradiation state and a non-irradiation state each time the predetermined trigger action is performed within a predetermined time. 12. The working tool according to claim 1, wherein the working tool is defined as an electric grinder.