CN114161368A - Trigger switch - Google Patents
Trigger switch Download PDFInfo
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- CN114161368A CN114161368A CN202110923220.1A CN202110923220A CN114161368A CN 114161368 A CN114161368 A CN 114161368A CN 202110923220 A CN202110923220 A CN 202110923220A CN 114161368 A CN114161368 A CN 114161368A
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- sensor
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- 238000001514 detection method Methods 0.000 claims abstract description 83
- 238000013459 approach Methods 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 abstract description 5
- 238000005299 abrasion Methods 0.000 abstract description 3
- 230000007257 malfunction Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 13
- 230000008859 change Effects 0.000 description 6
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/945—Proximity switches
- H03K2017/9455—Proximity switches constructional details
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Push-Button Switches (AREA)
- Portable Power Tools In General (AREA)
Abstract
Provided is a trigger switch which is assembled in an electric device such as an electric tool and drives a driving unit such as a driving motor of the electric device, and which can suppress the occurrence of an abnormality such as a failure or a malfunction due to the abrasion of a metal contact. The Trigger Switch (TS) is provided with: a trigger (1) that receives a press-in operation; a switching lever (3) which is operated by receiving a switching operation for switching the drive mode of the drive unit (M); a proximity sensor (6) that detects the proximity of a component; a switching detection part (51) which is linked with the action of the switching rod and approaches or leaves relative to the proximity sensor; and a drive detection section (13) which is brought into proximity with the proximity sensor in conjunction with the pressing of the trigger. The trigger switch determines a drive mode of the drive unit based on a proximity state of the switching detection target portion detected by the proximity sensor, and drives the drive unit in the determined drive mode when the proximity sensor detects proximity of the driving detection target portion.
Description
Technical Field
The present invention relates to a trigger switch that drives a driving unit upon receiving a pressing operation of a trigger.
Background
As one of the trigger switches for controlling the operation of the electric power tool, patent document 1 discloses an electric power tool switch in which the forward and reverse rotations of a motor are switched by a switching lever and the motor is rotated by pressing a trigger.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2006-231494
Disclosure of Invention
Technical problem to be solved by the invention
However, in the electric tool switch disclosed in patent document 1, the slider interlocked with the trigger slides on the upper surface of the sliding resistor to generate friction of the metal contact in response to operations such as switching of the switching lever and pressing of the trigger. The friction of the metal contact causes the deterioration with age due to the wear of the contact, which causes the occurrence of an abnormality such as a failure or a malfunction.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a trigger switch capable of suppressing occurrence of an abnormality due to abrasion or the like of a metal contact.
Technical solution for solving technical problem
In order to solve the above-described problem, a trigger switch according to the present invention is a trigger switch that receives a pressing operation of a trigger and drives a driving unit, the trigger switch including: a sensor that detects the approach of a component; a drive detection portion that is brought into proximity with the sensor in conjunction with press-fitting of the trigger; and a control unit that drives the drive unit when the sensor detects the approach of the drive detection unit.
In addition, the trigger switch described in the present application is a trigger switch that drives a driving unit in response to a pressing operation of a trigger, the trigger switch including: a switching means that operates upon receiving a switching operation for switching a drive mode of the drive unit; a sensor that detects the approach of a component; a switching detection section that moves closer to or away from the sensor in conjunction with the operation of the switching member; and a control unit that determines a drive mode for driving the drive unit based on the approach state of the switching detection unit detected by the sensor.
In addition, the trigger switch described in the present application is a trigger switch that drives a driving unit in response to a pressing operation of a trigger, the trigger switch including: a switching means that operates upon receiving a switching operation for switching a drive mode of the drive unit; a sensor that detects the approach of a component; a switching detection section that moves closer to or away from the sensor in conjunction with the operation of the switching member; a drive detection portion that is brought into proximity with the sensor in conjunction with press-fitting of the trigger; a control unit that controls the drive unit; the control unit includes: a determination unit configured to determine a drive mode of the drive unit based on an approach state of the switching detection target portion detected by the sensor; and a driving unit that drives the driving unit in the driving mode determined by the determining unit when the sensor detects the approach of the driving detection target unit.
In the trigger switch, the trigger switch may include a press-in detection unit that detects a press-in operation of the trigger, the determination unit of the control unit may determine a drive mode of the drive unit when the press-in detection unit detects the press-in operation, and the drive unit of the control unit may drive the drive unit after the determination unit determines the drive mode.
In the trigger switch, the driving unit of the control unit drives the driving unit with an output corresponding to the proximity of the driving detection target unit detected by the sensor.
In the trigger switch, the sensor is a sensor for detecting the presence or position of a metal body by a magnetic field, and the switching detection target portion and the driving detection target portion are metal bodies.
The trigger switch described in the present application is a trigger switch in which the drive unit is driven by pressing the trigger, and is characterized by including a sensor for detecting the position of the member, and the sensor drives the drive unit based on the detected position of the member.
ADVANTAGEOUS EFFECTS OF INVENTION
The trigger switch of the present invention drives the drive unit based on the approach condition of the component detected by the sensor. Therefore, since the use of the metal contact which may cause friction is suppressed, it is possible to suppress the occurrence of an abnormality such as a failure or malfunction due to wear of the metal contact, and to achieve an excellent effect.
Drawings
Fig. 1 is a schematic perspective view showing an example of an external appearance of a trigger switch described in the present application.
Fig. 2 is a schematic perspective view showing an example of the trigger switch according to the present application in a partially cut-away state.
Fig. 3 is a schematic side view showing an example of the trigger switch according to the present application in a partially cut-away state.
Fig. 4 is a schematic cross-sectional view showing an example of the trigger switch described in the present application.
Fig. 5A is a schematic external view showing an example of the external appearance of the switching lever and the urging member provided in the trigger switch described in the present application.
Fig. 5B is a schematic external view showing an example of the external appearance of the switching lever and the urging member provided in the trigger switch described in the present application.
Fig. 6 is a schematic external view showing an example of a joint member provided in the trigger switch described in the present application.
Fig. 7 is a schematic block diagram showing an example of a configuration related to a control unit in a control configuration provided in an electric device incorporating a trigger switch described in the present application.
Fig. 8 is a schematic plan view showing an example of the trigger switch described in the present application.
Fig. 9 is a schematic plan view showing an example of the trigger switch described in the present application.
Fig. 10 is a schematic plan view showing an example of the trigger switch described in the present application.
Fig. 11 is a schematic side view showing an example of the trigger switch according to the present application in a partially cut-away state.
Fig. 12 is a schematic diagram showing an enlarged view of an example of a part of the internal structure of the trigger switch described in the present application.
Fig. 13 is a schematic diagram showing an enlarged view of an example of a part of the internal structure of the trigger switch described in the present application.
Fig. 14 is a schematic diagram showing an enlarged view of an example of a part of the internal structure of the trigger switch described in the present application.
Fig. 15 is a schematic diagram showing an enlarged view of an example of a part of the internal structure of the trigger switch described in the present application.
Fig. 16 is a schematic diagram showing an enlarged view of an example of a part of the internal structure of the trigger switch described in the present application.
Fig. 17 is a flowchart schematically showing an example of processing of a control unit included in the trigger switch described in the present application.
Fig. 18 is a line diagram showing an example of a change in inductance detected by a proximity sensor provided in the trigger switch described in the present application.
Fig. 19 is a line diagram showing an example of a change in inductance detected by a proximity sensor provided in the trigger switch described in the present application.
Description of the reference numerals
TS trigger switch; 1, a trigger; 11 an operation part; 13 a drive detection target portion; 2, a frame body; 3 a switching lever (switching member); 31 a rod part; 34a cam portion; 4a force application component; 5 an engaging member; 51 a switching detection target portion; 6 a proximity sensor; 7 a press-in detection unit; 8 a control unit; an ET electric device; an MU body device; m drive portion.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
< application example >
The trigger switch described in the present application is applicable to various electric devices represented by electric tools such as electric drills, electric screwdrivers, electric wrenches, and electric grinders that include a driving unit such as a motor. In the following embodiments, such an example of the trigger switch TS will be described with reference to the drawings.
< embodiment >
Fig. 1 is a schematic perspective view showing an example of an external appearance of a trigger switch TS described in the present application. Fig. 1 shows an external appearance of a trigger switch TS of various electric devices ET (see fig. 7) that can be incorporated into an electric power tool or the like. The trigger switch TS is a switch operated by a user of the electric device ET, and is driven by a driving unit M (see fig. 7) such as an electric motor incorporated in the electric device ET by the user pushing the trigger 1 into the trigger switch TS. The trigger switch TS includes a substantially rectangular parallelepiped housing 2 that can be assembled to the electric device ET, and a trigger 1 that can be pushed in by an operator. The trigger switch TS includes a switching lever 3 (switching member) for switching the driving direction of the driving unit M, for example, the forward and reverse directions of the rotation of the electric screwdriver. In the following description, the direction of the trigger switch TS is represented by the side where the trigger 1 is attached being the front, the side of the housing 2 being the rear, the side of the switching lever 3 being the upper, and the opposite side of the switching lever 3 being the lower.
The internal structure including the trigger switch TS will be further described. Fig. 2 is a schematic perspective view showing an example of the trigger switch TS according to the present application in a partially cut-away state. Fig. 3 is a schematic side view showing an example of the trigger switch TS according to the present application in a partially cut-away state. Fig. 4 is a schematic cross-sectional view showing an example of the trigger switch TS described in the present application. Fig. 2 and 3 are illustrated as penetrating through the left half of the housing 2 so that the inside of the housing 2 can be visually confirmed. Fig. 4 is a schematic sectional view taken from the viewpoint of the direction a-B shown in fig. 1.
The trigger 1 of the trigger switch TS has a locking protrusion 10 formed on the upper surface, and the locking protrusion 10 is engaged with a locking recess 30 formed at the front end of the switching lever 3 as shown in fig. 2, thereby preventing an unexpected press-fitting of the trigger 1. The front surface of the trigger 1 forms an operation portion 11 on which a user places his or her finger when operating. A through shaft 12 extending from the inside of the operation portion 11 to the front and rear of the housing 2 is formed inside the trigger 1. The rear portion of the through shaft 12 passes through a through hole 20 formed in the front surface of the housing 2 and extends inside the housing 2. The drive detection unit 13 is attached to the rear end of the through shaft 12 located in the housing 2. The drive detection target portion 13 is formed using a metal material. The driving detection target portion 13 is formed in a shape in which a rectangular parallelepiped is cut out in a plane that intersects obliquely from the top to the rear, and is formed in a tapered shape in which the area of a vertical cross section decreases gradually from the front side to the rear side. A spring member 14 such as a compression coil spring for biasing the trigger 1 forward is disposed between the inside of the operation portion 11 and the front surface of the housing 2 so as to wind the through shaft 12 in the circumferential direction. The through shaft 12 and the spring member 14 are covered with a resin sleeve 15 formed in a corrugated shape.
The switching lever 3 is disposed above the housing 2 provided in the trigger switch TS. The inside of the housing 2 houses: various members such as a biasing member 4 for biasing the switching lever 3 forward, a joint member 5 for joining the switching lever 3, a proximity sensor 6 for detecting the proximity and position of the metal, a press-in detection unit 7 for detecting the press-in operation of the trigger 1, and a control unit 8 for performing various controls.
Fig. 5A and 5B are schematic external views showing an example of external appearance of the switching lever 3 and the urging member 4 included in the trigger switch TS described in the present application. Fig. 5A shows the switching lever 3 and the biasing member 4 for biasing the switching lever 3 forward from a viewpoint obliquely downward in the front direction, and fig. 5B shows it from a viewpoint downward.
The switching lever 3 and the biasing member 4 will be described with reference to fig. 2 to 4 and fig. 5A and 5B. The switching lever 3 is formed with portions such as a lock recess 30, a lever portion 31, a rocking shaft portion 32, an extension portion 33, and a cam portion 34. In the switching lever 3, the lock recess 30, the lever portion 31, and the pivot shaft portion 32 are exposed to the outside of the housing 2. The lever portion 31 is a portion to receive a swing operation by an operator, and the switching lever 3 receiving the swing operation swings left and right about the swing shaft portion 32 as a swing center. The front end lower portion of the lever portion 31 forms the aforementioned locking concave portion 30, and the locking concave portion 30 is engaged with the locking convex portion 10 formed on the upper surface of the trigger 1. Fig. 2 to 4 show a state in which the lock concave portion 30 of the lever portion 31 is engaged with the lock convex portion 10 of the trigger 1 to lock the lever portion 31.
In the switching lever 3, the extending portion 33 and the cam portion 34 are housed in the housing 2. The extension 33 is a portion extending substantially rearward from the pivot shaft 32, and a wide cam portion 34 is formed at the rear end of the extension 33. The cam portion 34 is formed in a substantially pentagonal shape with rounded corners in a top view. A semicircular engaging projection 34a that engages with the biasing member 4 is formed at an apex located at the rear end portion of the cam portion 34. The cam portion 34 has an arc-shaped cam groove 34b engraved on the lower surface thereof.
The biasing member 4 is disposed behind the switching lever 3 in the housing 2. The front surface of the biasing member 4 facing the switching lever 3 is formed in a substantially M shape in a top view, and an engagement recess 40 is formed near the center. The engagement concave portion 40 engages with an engagement convex portion 34a formed in the cam portion 34 of the switching lever 3. A compression coil spring is attached to the rear portion of the biasing member 4, and the entire biasing member 4 is biased toward the forward switching lever 3 by the compression coil spring.
Fig. 6 is a schematic external view showing an example of the joining member 5 provided in the trigger switch TS described in the present application. The engaging member 5 will be described with reference to fig. 2 to 4 and 6. Fig. 6 shows the joining member 5 from a viewpoint obliquely upward from the rear. The engaging member 5 is a member that operates by engaging with the switching lever 3, and a cam protrusion 50 that is fitted with a slight gap is formed in a cam groove 34b that is engraved in the lower surface of the cam portion 34 of the switching lever 3 at the upper portion. A switching detection target portion 51 using a metal rod extending rearward is formed at the rear portion of the joining member 5. The movement of the joining member 5 is limited in the front-rear direction by the frame 2. When the switching lever 3 is swung, the switching lever 3 functions as a master cam, and the engagement member 5 functions as a slave cam. The engagement of the arcuate cam groove 34b of the switching lever 3 and the cam projection 50 causes the rocking motion of the switching lever 3 to be transmitted as the forward and backward movement of the engagement member 5.
The proximity sensor 6 will be described with reference to fig. 2 to 4. The proximity sensor 6 is a sensor for detecting the proximity of a member, and for example, a sensor for detecting the presence or position of a metal body by a magnetic field can be used. The proximity sensor 6 of the present application is configured using a coil for generating a magnetic field as described in japanese patent No. 5115085, for example. The proximity sensor 6 detects proximity between the metal driving detection target portion 13 and the switching detection target portion 51.
The press-in detection unit 7 will be described with reference to fig. 4. The press-in detection portion 7 is formed using a flexible plate spring-like metal sheet, and is disposed above and below the through hole 20 in the inner surface on the front side of the housing 2. When the trigger 1 is not pushed in, the front surface of the drive detection target portion 13 made of a metal material is in contact with the upper and lower push-in detection portions 7. When the trigger 1 is pushed in, the drive detection section 13 moves backward and separates from the push-in detection section 7. When the drive detection target portion 13 is in contact with the upper and lower press-in detection portions 7, the upper and lower press-in detection portions 7 are electrically connected to the drive detection target portion 13 and thus are in a conductive state. When the drive detection target section 13 is separated from the press-in detection section 7, the upper and lower press-in detection sections 7 are electrically interrupted. Therefore, the press-in state of the flip-flop 1 can be detected based on the conductive state between the upper and lower press-in detection units 7.
Fig. 7 is a schematic block diagram showing an example of a configuration related to the control unit 8 in a control configuration provided in the electric device ET in which the trigger switch TS described in the present application is incorporated. The control unit 8 will be described with reference to fig. 2, 3, and 7. The electric device ET is formed by incorporating the trigger switch TS into the main body unit MU. The main body unit MU includes a driving unit M such as a motor. The control unit 8 of the trigger switch TS is, for example, a microcomputer using an integrated circuit such as a printed circuit board and various LSIs and VLSIs disposed on a substrate, and includes electronic elements and various terminals. The control unit 8 receives as input the detection results of the press-in detection unit 7 and the proximity sensor 6, executes various processes based on the detection results, and outputs a drive signal to the main unit MU to drive the drive unit M such as a motor provided in the main unit MU of the electric device ET. The electric device ET drives the driving unit M based on a driving signal input to the main body device MU.
Next, the operation and operation of the trigger switch TS described in the present application will be described. First, switching of the drive mode in the trigger switch TS described in the present application will be described. Fig. 8 to 10 are schematic plan views showing an example of the trigger switch TS described in the present application. Fig. 8 to 10 are schematic plan views showing a state where the housing 2 of the trigger switch TS described in the present application is removed. Fig. 8 shows a state where the switching lever 3 is positioned at the center of the swing range. When the operator does not drive the electric device ET, the switching lever 3 is positioned at the center of the swing range as in the example shown in fig. 8. In the case where the switching lever 3 shown in fig. 8 is located at the center of the rocking range, the locking concave portion 30 of the front end of the switching lever 3 and the locking convex portion 10 of the upper surface of the trigger 1 are engaged. Since the locking convex portion 10 of the trigger 1 is locked to the locking concave portion 30 and is in a state where press-fitting is impossible, the locking concave portion 30 and the locking convex portion 10 function as a safety mechanism for preventing accidental press-fitting.
Fig. 9 shows a state in which the switching lever 3 is swung to the left (counterclockwise rotation in the plan view). When the operator drives the driving unit M such as the motor of the electric device ET in the normal rotation mode in which the operator rotates in the normal rotation direction, the switching lever 3 is swung to the left. By swinging the switching lever 3 to the left as in the example shown in fig. 9, the engagement between the locking concave portion 30 of the switching lever 3 and the locking convex portion 10 of the trigger 1 is disengaged, and thus the trigger 1 is in a state of being able to be pushed in. Then, as the switching lever 3 swings, the engaging member 5 engaged with the cam projection 50 on the cam groove 34b engraved in an arc shape on the lower surface of the cam portion 34 of the switching lever 3 moves forward in conjunction with the swing of the switching lever 3.
Fig. 10 shows a state in which the switching lever 3 is swung to the right (rotated clockwise in plan view). When the operator drives the driving unit M such as the motor of the electric device ET in the reverse mode in which the operator rotates in the reverse direction, the switching lever 3 is swung to the right. As illustrated in fig. 10, the toggle lever 3 is swung to the right side, and the trigger 1 is in a state of being able to be pushed in. Then, the engaging member 5 moves backward in conjunction with the swing of the switching lever 3.
Fig. 11 is a schematic side view showing an example of the trigger switch TS according to the present application in a partially cut-away state. Fig. 12 and 13 are schematic diagrams showing an enlarged example of a part of the internal structure of the trigger switch TS described in the present application. Fig. 11 is a view showing a left half of the housing 2 through which the inside of the housing 2 can be visually recognized. Fig. 12 and 13 are enlarged views showing the inside of the housing 2. Fig. 11 and 12 show a state in which the switching lever 3 is swung to the left side to set the drive mode to the normal rotation mode. The engagement member 5 moves forward in conjunction with the leftward swing of the switching lever 3. Fig. 13 shows a state in which the switching lever 3 is swung to the right side to set the drive mode to the reverse mode. The engaging member 5 moves rearward in conjunction with the rightward swing of the switching lever 3. The position of the proximity sensor 6 with respect to the switching detection section 51 formed at the rear portion of the joining member 5 changes by the forward and backward movement of the joining member 5. The proximity sensor 6 detects the position of the switching detection target portion 51 as a change in inductance. Specifically, at a position of the switching detection section 51 close to the proximity sensor 6, the inductance value increases as compared with a position away from the proximity sensor 6. Therefore, the control unit 8 can determine whether the drive mode is the normal rotation mode or the reverse rotation mode based on the inductance value detected by the proximity sensor 6.
Next, an internal operation of the press-fitting operation of the trigger 1 in the trigger switch TS described in the present application will be described. Fig. 14 to 16 are schematic diagrams showing an enlarged example of a part of the internal structure of the trigger switch TS described in the present application. Fig. 14 to 16 show the inside of the housing 2 in an enlarged manner.
Fig. 14 shows a state in which the engagement member 5 is positioned at the front and the trigger 1 is not pressed. When the trigger 1 is not pushed in, the drive detection section 13 of the trigger 1 is positioned at the front end of the movement range in the housing 2 and contacts the upper and lower push-in detection sections 7. In the state illustrated in fig. 14, the control unit 8 does not output a drive signal to the drive unit M included in the main unit MU of the electric device ET.
Fig. 15 shows a state where the flip-flop 1 is pressed from the state illustrated in fig. 14. When the operator pushes the trigger 1, the drive detection section 13 of the trigger 1 is separated from the upper and lower push detection sections 7. The upper and lower press-fit detecting portions 7 are electrically interrupted by the drive detection portion 13 of the trigger 1 being separated from the upper and lower press-fit detecting portions 7. When detecting the interruption between the press-fit detection sections 7, the control section 8 determines the drive mode of the drive section M based on the inductance detected by the proximity sensor 6. In the example shown in fig. 15, the switching detection section 51 of the joining member 5 is positioned forward, and thus the normal rotation mode is determined.
After determining the normal rotation mode, the operator further pushes the trigger 1, and the detection target portion 13 for driving the trigger 1 approaches the proximity sensor 6, so that the coil enters the inner region of the winding. The proximity sensor 6 detects the proximity of the driving detection target portion 13 as a change in the inductor. Since the driving detection target portion 13 is formed in a tapered shape in which the area of the vertical cross section decreases gradually from the front side to the rear side, the inductance gradually increases as the driving detection target portion 13 approaches the coil of the proximity sensor 6 and further enters the inner region. After determining the drive mode, the control unit 8 operates the drive unit M based on the inductance detected by the proximity sensor 6, and controls the output related to the operation in accordance with the inductance. For example, the driving unit M is rotated in the normal rotation direction by the number of rotations corresponding to the press-in amount.
Fig. 16 shows a state in which the switching detection portion 51 of the joining member 5 is positioned rearward and the trigger 1 is pushed in. Since the switching detection section 51 is located at the rear, if the operator pushes the trigger 1, the driving mode is determined as the reverse mode. Then, the driving unit M is rotated in the reverse direction by the number of rotations corresponding to the pushing amount of the trigger 1.
Next, control of the control unit 8 provided in the trigger switch TS described in the present application will be described. Fig. 17 is a flowchart schematically showing an example of processing of the control unit 8 provided in the trigger switch TS described in the present application. The control unit 8 of the trigger switch TS corresponds to a rest state in a state where the trigger 1 is not pushed, and is activated if a wake-up signal such as power is input (step S1). The wake-up signal is input as, for example, power to the control unit 8 when the press-in detection unit 7 is detected to be blocked. The control unit 8 causes the wake-up signal to execute the subsequent processing as the detection of the press-in operation by the press-in detection unit 7.
The activated control unit 8 detects the approach or separation of the switching detection target unit 51 by the inductance detected by the proximity sensor 6 (step S2), and determines the drive mode of the drive unit M based on the detection result (step S3).
Fig. 18 is a line diagram showing an example of a change in inductance detected by the proximity sensor 6 provided in the trigger switch TS described in the present application. Fig. 18 shows the relationship between the pressing amount of the flip-flop 1 on the horizontal axis and the inductance on the vertical axis. The value of the inductance is constant regardless of the pressing amount of the trigger 1, and changes depending on the normal rotation mode and the reverse rotation mode. In steps S2 to S3, the controller 8 determines whether the mode is the normal rotation mode in which the inductance value is smaller than the threshold value or the reverse rotation mode in which the inductance value is larger than the threshold value by comparing the mode with a preset threshold value, and determines the drive mode of the driver M based on the determination result.
Returning to the flowchart of fig. 17, after the drive mode is determined, the control unit 8 that activates the switch TS detects the proximity of the driven detection object 13 by the inductance detected by the proximity sensor 6 (step S4), and outputs the drive of the drive unit M based on the detection result (step S5). In steps S4 to S5, an output corresponding to the degree of proximity is output in the drive mode determined in step S3. The control unit 8 outputs an analog signal or a digital signal obtained by converting the value of the inductance, or an analog signal or a digital signal indicating the number of rotations of the driving unit M, which is a motor, to the driving unit M as an output for driving the driving unit M.
Fig. 19 is a line diagram showing an example of a change in inductance detected by the proximity sensor 6 provided in the trigger switch TS described in the present application. Fig. 19 shows the relationship between the pressing amount of the flip-flop 1 on the horizontal axis and the inductance on the vertical axis. As illustrated in fig. 19, the inductance gradually increases with an increase in the amount of press-fitting of the trigger 1. The control unit 8 outputs an output corresponding to the detected inductance, that is, an output for driving the driving unit M at a rotation speed corresponding to the inductance. It can be set as appropriate that the driving unit M is driven at a rotation speed increased in accordance with the amount of pushing until the pushing reaches the inductance predetermined value; after reaching the predetermined value, the press-in amount is driven at a constant rotation speed.
During the start-up, the control unit 8 controls the drive of the drive unit M in accordance with the pushing amount of the trigger 1 through the processing of step S3. When the operator releases the press-fitting of the trigger 1 and the press-fitting detection unit 7 is in the energized state, the control unit 8 stops the output to the drive unit M and becomes the inactive state. As described above, the control unit 8 controls the driving unit M provided in the main unit MU.
As described above, the trigger switch TS described in the present application detects the proximity of the switching detection target section 51 and the driving detection target section 13 by the proximity sensor 6, and drives the driving section M in accordance with the detection result. The trigger switch TS described in the present application detects the switching state of the switching lever 3 and the press-fitting state of the trigger 1 in a non-contact manner, and thus can reduce contact type contacts such as metal contacts. Therefore, the excellent effect of suppressing the occurrence of an abnormality due to aged deterioration such as abrasion of the metal contact can be obtained.
The present invention is not limited to the various embodiments described above, and can be implemented in other various ways. Therefore, the above-described embodiments are merely examples of the respective points and are not intended to be interpreted in a limiting manner. The technical scope of the present invention is defined by the scope of the claims, and is not limited in any way by the specification. Further, all changes and modifications within the equivalent range falling within the scope of the claims are included within the scope of the present invention.
For example, in the above-described embodiment, the approach sensor 6 detects approach of a component based on inductance, but the present invention is not limited thereto, and various non-contact sensors such as a capacitance sensor, a magnetic field sensor, and an optical sensor may be used.
In the above-described embodiment, the normal rotation mode and the reverse rotation mode indicating the driving direction of the driving unit M are set as the driving modes that can be switched by the switching lever 3, but the present invention is not limited to this. For example, a gear shift mode in which the rotation speed is controlled in accordance with the pressing amount and a constant speed mode in which the rotation speed is constant regardless of the pressing amount can be appropriately set as a switchable drive mode.
In the above embodiment, the embodiment has been described in which the control unit 8 is housed in the housing 2, but the present invention is not limited to this, and may be developed in a manner in which the control unit 8 is housed in the main unit MU by being removed from the housing 2.
Claims (7)
1. A trigger switch for driving a driving unit in response to a pressing operation of a trigger, comprising:
a sensor that detects the approach of a component;
a drive detection portion that is brought into proximity with the sensor in conjunction with press-fitting of the trigger;
and a control unit that drives the drive unit when the sensor detects the approach of the drive detection unit.
2. A trigger switch for driving a driving unit in response to a pressing operation of a trigger, comprising:
a switching means that operates upon receiving a switching operation for switching a drive mode of the drive unit;
a sensor that detects the approach of a component;
a switching detection section that moves closer to or away from the sensor in conjunction with the operation of the switching member;
and a control unit that determines a drive mode for driving the drive unit based on the approach state of the switching detection unit detected by the sensor.
3. A trigger switch for driving a driving unit in response to a pressing operation of a trigger, comprising:
a switching means that operates upon receiving a switching operation for switching a drive mode of the drive unit;
a sensor that detects the approach of a component;
a switching detection section that moves closer to or away from the sensor in conjunction with the operation of the switching member;
a drive detection portion that is brought into proximity with the sensor in conjunction with press-fitting of the trigger;
a control unit that controls the drive unit;
the control unit includes:
a determination unit configured to determine a drive mode of the drive unit based on an approach state of the switching detection target portion detected by the sensor;
and a driving unit that drives the driving unit in the driving mode determined by the determining unit when the sensor detects the approach of the driving detection target unit.
4. The trigger switch of claim 3, wherein:
a press-in detection unit for detecting the press-in operation of the trigger,
the determination unit of the control unit determines a drive mode of the drive unit when the press-in detection unit detects a press-in operation,
the drive unit of the control unit drives the drive unit after the determination unit determines the drive mode.
5. The trigger switch according to claim 3 or 4,
the driving unit of the control unit drives the driving unit with an output corresponding to the degree of proximity of the driven detected unit detected by the sensor.
6. The trigger switch of any one of claims 3 to 5,
the sensor is a sensor for detecting the presence or position of a metal body using a magnetic field,
the switching detection target portion and the driving detection target portion are metal bodies.
7. A trigger switch in which a driving unit is driven by pressing a trigger in,
comprises a sensor for detecting the position of the component,
the sensor drives the driving section based on the detected position of the component.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-152333 | 2020-09-10 | ||
| JP2020152333A JP2022046337A (en) | 2020-09-10 | 2020-09-10 | Trigger switch |
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| Publication Number | Publication Date |
|---|---|
| CN114161368A true CN114161368A (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110923220.1A Pending CN114161368A (en) | 2020-09-10 | 2021-08-12 | Trigger switch |
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| JP (1) | JP2022046337A (en) |
| CN (1) | CN114161368A (en) |
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Also Published As
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| JP2022046337A (en) | 2022-03-23 |
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