JP7403767B2 - punching device - Google Patents

Description

The present invention relates to a drilling device that punches a rectangular hole in a wall material to match a wiring box placed on the back side of the wall material.

In houses and buildings, wiring boxes for wiring power lines, communication lines, telephone lines, etc. are installed on the back side of wall materials such as gypsum boards before the wall materials are constructed. After the wall material is installed, metal plates 7, 7 such as aluminum foil are placed on the top and bottom of the front side (wall material side) as a means to enable non-contact detection of the wiring box on the back side of the wall material from the front side of the wall material. A configuration is known in which the following is arranged (Patent Document 1).

Conventional detection devices that detect this type of wiring box from the front side of the wall material place metal sensors at the top and bottom of the front surface that contacts the wall material at a distance equivalent to the distance between the metal plates added to the wiring box. It consists of an arranged configuration. The user moves the detection device up and down and left and right along the wall material so as to bring it into close contact with the wall material. During the movement, when both metal sensors detect nearby metal, the detection device emits light/sounds with a light emitting element and/or a sounding element.

After detecting the wiring box on the back side of the wall material with this type of detection device, the worker marks the location of the wiring box on the surface of the wall material, presses the perforating device against the wall surface using this mark as a guide, and then disconnects the power supply. Drill an opening for the wire or signal wire to pass through.

As a perforating device, a configuration in which a circular hole is punched with a cylindrical blade and a configuration in which an oval-shaped (elliptical) hole is punched are known (Patent Document 2). Screw holes are provided at the top and bottom of the wiring box for screwing the metal holding plates into which the decorative panels on the surface of the wall material are fitted into the wiring box. Therefore, the hole (opening) that you want to make in the wall material is usually a vertically long rectangle that allows you to see through the screw holes on the top and bottom of the wiring box. With a drilling device of the former configuration, the position of the drilling device is changed so that a part of the circular hole overlaps, and the drilling operation is performed twice in total, whereas with a drilling device of the latter configuration, the drilling operation is performed once. That's enough.

Japanese Patent Application Publication No. 2005-143208 Japanese Patent Application Publication No. 2015-186289

Conventionally, a worker must prepare a detection device and a drilling device separately and operate them separately. In other words, detection work and drilling work cannot be performed at the same time, resulting in poor work efficiency.

If it were possible to shift from detection to drilling without switching from the detection device to the drilling device, work efficiency would be greatly improved. Further, the drilling operation itself is inefficient if it requires two operations, such as partially overlapping drilling of two circular holes, so it is preferable to complete the operation only once. Furthermore, if the hole drilled in the wall material is a simple rectangular shape, the subsequent wiring work will be safe and easy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drilling device that can perform detection work and drilling work at the same time.

The drilling device according to the present invention includes a detection means for non-contact detection of a wiring box placed on the back side of a wall material, and a movement restriction means for regulating movement along the wall material during drilling after detection by the detection means. , a perforating means for making a rectangular hole in the wall material that is accessible to the wiring box, the wiring box having a first metal plate on the upper side facing the wall material, and a first metal plate on the upper side facing the wall material; A second metal plate is provided on the side, and the detection means includes a plurality of metal sensors that can simultaneously detect the first and second metal plates, and a sensor holding means that holds the metal sensors at the front end. a first biasing device that constantly biases the sensor holding device toward the wall material; a determining device that determines that the wiring box is in the front position; and a notification of the determination result of the determining device to the worker. The movement regulating means includes two or more puncturing means each having a tip that can pierce the wall material, and a second puncturing means that constantly urges the two or more puncturing means toward the wall material. The perforating means includes four cutting plates arranged on the four sides of a rectangle that can cut the wall material at the tip surface, and a cutting plate that supports the four cutting plates. It is characterized by comprising a support means and a vibration motor that vibrates the four cutting plates via the cutting plate support means .

According to the present invention, the work of detecting the wiring box placed on the back side of the wall material and the drilling work of drilling a hole to access the wiring box can be performed in a series, improving work efficiency.

FIG. 1 is a side view of an embodiment of the present invention. It is a front view of the detection perforation unit of a present Example. FIG. 3 is a central sectional view of the detection and perforation unit taken along line AA in FIG. 2; FIG. 3 is a plan view of the detection and drilling unit. 1 is a schematic configuration block diagram showing an example of a processing circuit configuration of this embodiment. FIG. This is an example of change in metal sensor output. FIG. 3 is a cross-sectional view showing the positional relationship between the detection perforation unit and the wiring box during detection. These are an example of a metal sensor output waveform and an example of a composite waveform of this embodiment. FIG. 3 is a longitudinal cross-sectional view of the detection and perforation unit in a state where it is locked to a wall material with a puncture rod. It is a schematic diagram showing the state of cutting of the wall material in this example. It is a longitudinal cross-sectional view of the detection perforation unit after perforation is completed. FIG. 6 is a front view of a modified example of the detection and drilling unit in which four metal sensors are arranged. 3 is a schematic configuration block diagram of an example of a processing circuit for metal sensor output according to a second embodiment. FIG. This is an example of changing the movement restriction means.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view of an embodiment of a drilling device according to the present invention. The drilling device 10 of this embodiment includes a grip section 12 held in the hand of an operator, and a detection drilling unit 14 attached to the tip of the grip section 12. A battery 16 as a power source is removably attached to the bottom of the grip 12. A lever 18 as an operating means is provided on the front side of the grip portion 12 at a portion on which the index finger rests. Although details will be described later, when the operator pushes the lever 18 into the grip portion 12, the detection and drilling unit 14 starts the drilling operation.

The detection and perforation unit 14 has a function of detecting a wiring box 82 fixedly placed in advance on the back side of the wall material 80 without contact, and a function of making a rectangular opening in the wall material 80 for accessing the wiring box 82. has. The wall material 80 is made of gypsum board, for example. Aluminum foils 84 and 86 are attached to the upper and lower sides of the wiring box 82 facing the wall material 80, respectively, to detect the wiring box 82 in a non-contact manner through the wall material 80.

2 shows a front view of the detection perforation unit 14, FIG. 3 shows a cross-sectional view of the detection perforation unit 14 taken from line A-A in FIG. 2, and FIG. 4 shows a plan view of the detection perforation unit 14. show.

The detection and perforation unit 14 has a motor 20 at a position where it enters the gripping part 12, as shown in FIG. A rotating shaft 22 of the motor 20 is rotatably supported via a bearing 26 by an exterior 24 that houses the main mechanical parts of the detection and drilling unit 14. A bearing 30 is fixed to the center of the rectangular cutting plate support plate 28, and the tip of the rotating shaft 22 is rotatably attached to the cutting plate support plate 28 by the bearing 30. An eccentric weight 32 is fixed between the bearings 26 and 30 of the rotating shaft 22. Due to the eccentric weight 32, the axial center of the rotating shaft 22 oscillates laterally depending on the rotational speed. That is, the motor 20 functions as a vibration motor whose rotating shaft rotates eccentrically due to the eccentric weight 32 . When a vibration motor incorporating a member corresponding to the eccentric weight 32 is employed as the motor 20, the eccentric weight 32 becomes unnecessary.

Cutting plates 34, 36, 38, and 40 are screwed to each of the four sides of the cutting plate support plate 28. Each cutting plate 34, 36, 38, 40 is partially separated into a plurality of cutting pieces by slits 34A, 36A, 38A, 40A cut from the front end surface toward the cutting plate support plate 28. There is. In the illustrated embodiment, the cutting plates 34, 38 located on the short sides are separated into four cutting pieces by the slits 34A, 38A, and the cutting plates 36, 40 located on the long sides are separated into six cutting pieces by the slits 36A, 40A. separated into The cutting plates 34, 36, 38, and 40 are made of metal plates whose tip surfaces are cut vertically, and the wall material 80 can be easily cut by the rotation of the motor 20 and the slight lateral vibration of the rotating shaft 22 by the eccentric weight 32. In addition, it can be cut with a narrow cutting width. This leads to a reduction in chips compared to cutting with a saw blade. Since the cutting plates 34, 36, 38, 40 are separated into a plurality of cutting pieces by the slits 34A, 36A, 38A, 40A, each cutting piece can be oscillated independently, improving cutting ability. This also leads to a reduction in chips.

The cutting plate support plate 28 has openings 42A and 42B on both sides of the bearing 30 in the long side direction (perpendicular to the short side) of the cutting plate support plate 28. Puncture rods 44A and 44B, which serve as means for locking or fixing the punching device 10 to the wall material 80 after detecting the wiring box 82, penetrate through the openings 42A and 42B, respectively. The tips of the puncture rods 44A and 44B are formed into a conical shape that can bite into the wall material 80. The puncture rods 44A, 44B are guided by hollow cylindrical support columns 46A, 46B and can move back and forth, and are moved forward (in the direction toward the wall material 80) by compression springs 48A, 48B in the support columns 46A, 46B. Always energized. The lower sides of the support columns 46A, 46B are fixed to the exterior 24 by means such as screwing. The puncture rods 44A, 44B have thicker root portions, and the thicker root portions are inserted into the shoulder portions of the openings of the support columns 46A, 46B through which the narrow diameter portions other than the root portions of the puncture rods 44A, 44B are inserted. By colliding with each other, they are supported by the support columns 46A, 46B so as not to fall off the support columns 46A, 46B.

When the puncture rods 44A, 44B are in a released state in which nothing is touching their tips, the tips of the puncture rods 44A, 44B are a predetermined distance in front of the tip surfaces of the cutting plates 34, 36, 38, 40, as shown in FIG. It is in a protruding position located at . On the other hand, when the tips of the puncture rods 44A, 44B are pressed against the wall material 80 with a predetermined force or more that resists the stretching force of the compression springs 48A, 48B, the tips of the puncture rods 44A, 44B are stuck in the wall material 80. In this state, the cutting plates 34, 36, 38, 40 can be moved to a retracted position retracted from the tip surfaces thereof.

The exterior 24 rises at the outer edge portion to cover the middle to lower portions of the cutting plates 34, 36, 38, 40 to form a peripheral wall, and this peripheral wall portion of the exterior 24 (cutting plates 34, 36, 38, 40) A hollow prismatic sensor holding frame 52 is arranged between the cutting plates 34, 36, 38, and 40 so as to be movable back and forth. As shown in FIG. 2, two metal sensors 50UR and 50UL are arranged on the upper left and right sides of the front end surface of the sensor holding frame 52, and one metal sensor 50D is arranged at the lower center. At positions facing the cutting plates 36 and 40 of the sensor holding frame 52, protrusions 52a and 52a are provided along the cutting plates 36 and 40 to suppress the rotational movement of the cutting plate support plate 28 itself as the rotation shaft 22 rotates. It is formed as follows. That is, the sensor holding frame 52 is provided with protruding portions 52a, 52a whose tip surfaces are parallel to and located very close to the cutting plates 36, 40.

The metal sensors 50UR, 50UL, and 50D detect the aluminum foil 84 on the upper side of the wiring box 80 when the detection perforation unit 14 correctly faces the wiring box 82, and the metal sensor 50D detects the aluminum foil 84 on the lower side. They are arranged in a positional relationship to detect the aluminum foil 86. That is, the distance between the metal sensors 50UR and 50UL is equivalent to the width of the aluminum foils 84 and 86, and the distance between the middle of the metal sensors 50UR and 50UL and the metal sensor 50D is equivalent to the distance between the aluminum foils 84 and 86. be. The metal sensors 50UR, 50UL, and 50D are arranged in a positional relationship forming an isosceles triangle with the metal sensor 50D at the apex and the metal sensors 50UR, 50UL at the base.

As shown in FIG. 3, a plurality of compression springs 54 are arranged between the lower end of the sensor holding frame 52 and the inner surface of the exterior 24 to always bias the sensor holding frame 52 forward. The sensor holding frame 52 is always urged forward by these compression springs 54. The compression springs 54 are arranged, for example, at four corners of the sensor holding frame 52. In order to prevent the sensor holding frame 52 from falling off from the exterior 24, the lower part of the sensor holding frame 52 is made thicker on the outside, and on the other hand, the tip part of the raised part of the exterior 24 is made thicker on the inside. When these shoulder portions engage with each other, the sensor holding frame 52 cannot move forward beyond this position. In this state, as shown in FIG. 3, the outer shape of the lower part of the sensor holding frame 52 and the outer shape of the exterior 24 are adjusted so that the distal end surface of the sensor holding frame 52 is located in front of the tips of the puncture rods 44A and 44B. The inner shape of the peripheral wall part is designed.

As shown in FIG. 4, an LED (light emitting diode) is mounted on the top surface of the detection perforation unit 14 as a display means to notify the operator of the detection status of the aluminum foils 84 and 86 of the wiring box 82 arranged on the back side of the wall material 80. ) 56UR, 56UL, 56C, and 56D are arranged. The LEDs 56UR, 56UL, 56D are arranged in the same positional relationship as the corresponding metal sensors 50UR, 50UL, 50D, and the LED 56C is arranged between the LEDs 56UR, 56UL.

The upper right LED 56UR lights up when the metal sensor 50UR detects metal such as aluminum foil on the back side of the wall material 80. The upper left LED 56UL lights up when the metal sensor 50UL detects metal such as aluminum foil on the back side of the wall material 80. The lower LED 56D lights up when the metal sensor 50D detects metal such as aluminum foil on the back side of the wall material 80. The central LED 56C lights up when the metal sensors 50UR and 50UL simultaneously detect metal such as aluminum foil. When the wiring box 82 is located in front of the detection and drilling unit 14, the LEDs 56C and 56D light up at the same time. If the width of the aluminum foil 84 is larger than the distance between the metal sensors 50UR and 50UL, the LEDs 56UR and 56UL will also light up, but if the distance between the metal sensors 50UR and 50UL is smaller than the width of the aluminum foil 84, the LEDs 56UR and 56UL may not light up. It's possible.

FIG. 5 is a schematic block diagram of the processing circuit of this embodiment. The circuit shown in FIG. 5 includes a processing circuit that processes sensor outputs of metal sensors 50UR, 50UL, and 50D, and a circuit that drives motor 20.

FIG. 6 shows an output characteristic diagram of the metal sensors 50UR, 50UL, 50D when the metal sensors 50UR, 50UL, 50D are moved parallel to the aluminum foils 84, 86. In FIG. 6, the horizontal axis indicates the horizontal (or vertical) position, and the vertical axis indicates the outputs of the metal sensors 50UR, 50UL, and 50D. Here, for ease of understanding, the metal sensors 50UR, 50UL, and 50D have sensor output characteristics that are low level (zero value in Figure 6) when not detecting metal, and increase in level as they get closer to metal. shall have. In FIG. 6, the sensor output value Vm when metal is detected generally depends on the distance between the metal sensors 50UR, 50UL, 50D and the aluminum foils 84, 86 to be detected, and the material of the wall material 80.

The operation of detecting the wiring box 82 by the punching device 10 will be explained. FIG. 7 shows a vertical cross-sectional view of the detection perforation unit 14 pressed against the wall material 80 during detection.

As shown in FIG. 7, the detection perforation unit 14 is lightly pressed against the wall material 80 near the wiring box 82 to the extent that the tips of the puncture rods 44A, 44B do not touch the wall material 80, and are moved up and down along the wall material 80. Move left and right. For example, the detection and perforation unit 14 is moved up and down along the wall material 80 in the vicinity where the wiring box 82 is expected to be present, and a position is searched for where one of the LEDs 56UR and 56UL is lit and the LED 56D is lit. In this state, the detection and perforation unit 14 is in the correct position in the vertical direction with respect to the wiring box 82, but is out of alignment in the horizontal direction (lateral direction). Therefore, the detection perforation unit 14 is moved horizontally (laterally) along the wall material 80 to a position where the LED 56C lights up. When both LEDs 56C and 56D are lit, the detection and perforation unit 14 is positioned in front of the wiring box 82. For example, if any of the metal sensors 50UR, 50UL, 50D detects a nail instead of the aluminum foils 84, 86, the corresponding LED will turn off when moved vertically or horizontally, and the LED 56C will not turn on either, so the purpose It turns out that it is not a wiring box.

With reference to FIG. 8, the output processing of the metal sensors 50UR, 50UL, and 50D during detection will be described. FIG. 8 shows an example of the output waveform and a composite waveform of the metal sensor with respect to the horizontal movement of the detection and perforation unit 14, and FIG. 8(a) shows an example of the output change of the lower metal sensor 50D, and FIG. 8(b) shows An example of a change in the output of the metal sensors 50UR and 50UL is shown, and FIG. 8(c) shows an example of a change in the sum of the outputs of the metal sensors 50UR and 50UL. In FIG. 8, the horizontal axis indicates the horizontal position when the drilling device 10 (detection drilling unit 14) is moved in the horizontal direction, and the vertical axis indicates the outputs of the metal sensors 50UR, 50UL, and 50D.

The drive circuit 60UR drives the upper right LED 56UR in accordance with the output of the upper right metal sensor 50UR so that the larger the output value of the metal sensor 50UR, the brighter the LED 56UR lights up. However, the drive circuit 60UR may turn off the upper right LED 56UR when the sensor output of the metal sensor 50UR is less than a predetermined value, for example, less than a metal detection threshold TH1 described below. Similarly to the drive circuit 60UR, the drive circuits 60UL and 60D control the upper right LED 56UR and the lower LED 56D in accordance with the outputs of the metal sensors 50UL and 50D, respectively, so that the larger the output value of the metal sensors 50UL and 50D, the brighter the light is lit. Drive.

The operator moves the perforation device 10 (the detection perforation unit 14 thereof) vertically and horizontally along the vertically erected wall material 80. Due to this movement, one of the metal sensors 50UR and 50UL detects the aluminum foil 84, the drive circuits 60UR and 60UL light up either or both of the upper right LED 56UR and the upper left LED 56UL, and the metal sensor 50D detects the aluminum foil 84. The drive circuit 60UD reaches a position where the lower LED 56D is turned on by detecting the lower LED 56D. If the position of the wiring box 82 can be predicted to some extent from the design drawing or construction, the wiring box 82 can be roughly detected by moving the perforation device 10 (detection perforation unit 14 thereof) according to the prediction. In this state, the operator can detect the position of the wiring box 82 on the back side of the wall material 80 in the vertical direction with the drilling device 10 (detection drilling unit 14), but in the horizontal direction, the upper right LED 56UR, There is no choice but to rely on the lighting brightness of the upper left LED 56UL and the lower LED 56D.

In this embodiment, the horizontal position of the wiring box 82 can be detected with high accuracy from the sum of the sensor outputs of the metal sensors 50UR and 50UL. The operation will be explained in detail below.

In order to confirm that the lower metal sensor 50D is detecting the aluminum foil 86 on the lower side of the wiring box 82, the comparison circuit 62 compares the sensor output of the metal sensor 50D with the metal detection threshold TH1. The comparison circuit 62 makes the output high (H) when the sensor output is equal to or higher than the metal detection threshold TH1, and makes the output low (L) otherwise. As shown in FIG. 8(a), the metal detection threshold TH1 is, for example, the sensor output when the metal sensors 50UR, 50UL, 50D do not detect the aluminum foils 84, 86, and the sensor output when the metal sensors 50UR, 50UL, 50D do not detect the aluminum foils 84, 86. It is set to an intermediate value between the sensor output Vm and the sensor output Vm. That is, the metal detection threshold TH1 is a reference value for identifying whether or not the metal sensors 50UR, 50UL, 50D are in a metal detection state in which they detect the aluminum foils 84, 86. The output H of the comparator circuit 62 indicates that the metal sensor 50D is in a metal detection state facing either of the aluminum foils 84, 86.

In FIG. 8(b), the solid line indicates the sensor output of the metal sensor 50UL, and the broken line indicates the sensor output of the metal sensor 50UR. The metal sensor 50UL and the metal sensor 50UR are separated from each other in the horizontal direction (generally horizontal direction), and the sensor outputs of the metal sensors 50UL and 50UR are indicated by the solid line in FIG. 8(b) according to this horizontal distance. It is shifted from the horizontal position as shown by the broken line. By making the interval between the metal sensor 50UL and the metal sensor 50UR approximately the same as the width of the aluminum foil 84 to be detected, the overlapping portion of the sensor outputs can be narrowed, and the accuracy of horizontal position detection is improved.

Adder 64 adds the sensor outputs of metal sensors 50UL and 50UR. FIG. 8(c) shows the output of the adder 64. As shown in FIG. 8(c), the adder 64 detects a peak when the perforation device 10 (detection perforation unit 14 thereof) faces the center position of the aluminum foil 84, that is, the horizontal center position of the wiring box 82. have The position of the maximum value of this peak (approximately 2 Vm in the illustrated example) corresponds to the center (horizontal center) of the wiring box 82 that is the detection target.

A comparison circuit 66 compares the output of the adder 64 with a central determination threshold TH2. The comparison circuit 66 sets the output to high (H) when the output of the adder 64 is equal to or higher than the central determination threshold TH2, and sets the output to low (L) otherwise. The central determination threshold TH2 is a reference value for determining that the metal sensors 50UL and 50UR are in the metal detection state at the same time, and is a value that is larger than the sensor output value Vm during metal detection and lower than the peak value of the adder 64. is set to The closer the center determination threshold TH2 is to the metal detection sensor output value Vm, the lower the center detection accuracy becomes, and the closer it is to the peak value of the output of the adder 64, the higher the center detection accuracy becomes. If the center determination threshold TH2 is larger than the peak value of the output of the adder 64, the left and right centers cannot be detected. Therefore, it is preferable that the central determination threshold TH2 is changeable. The means for this change will be described later.

In place of the comparison circuit 66, a comparison circuit that compares the sensor output of the metal sensor 50UL with the metal detection threshold TH1 and a comparison circuit that compares the sensor output of the metal sensor 50UR with the metal detection threshold TH1 are provided, and the AND circuit 68 The binary output of the alternative comparison circuit and the binary output of the comparison circuit 62 may be ANDed.

The AND circuit 68 takes the AND of the binary outputs of the comparison circuits 62 and 66. That is, the AND circuit 68 makes the output high (H) only when the outputs of the comparison circuits 62 and 66 are both high (H), and makes the output low (L) in other cases. The normally open switch 70 is in a closed (ON) state when the output of the AND circuit 68 is high (H), and is in an open (OFF) state when the output of the AND circuit 68 is low (L).

The output of adder 64 is applied via switch 70 to drive circuit 60C for central LED 56C. That is, only when the drilling device 10 (detection drilling unit 14) can almost detect the center of the wiring box 82 (when the outputs of the comparison circuits 62 and 66 are both high (H)), the output of the adder 64 is It is applied to the drive circuit 60C. The drive circuit 60C causes the central LED 56C to emit light at a brightness that corresponds to the output value of the adder 64 input via the switch 70. From the lighting and luminance of the central LED 56C, the operator knows that the drilling device 10 (detection drilling unit 14) is facing the horizontal and vertical center of the wiring box 82 located on the back side of the wall material 80. be able to.

In this embodiment, a circuit configuration consisting of a comparison circuit 62, an adder 64, a comparison circuit 66, an AND circuit 68, and a switch 70 is configured so that the detection perforation unit 14 is installed in the horizontal direction (lateral direction) of the wiring box 82 located on the back side of the wall material 80. Since the center LED 56C is enabled to light up only when the wiring box 82 faces substantially the center in both the vertical direction (direction) and the vertical direction (up and down direction), the horizontal center of the wiring box 82 can be detected with high accuracy. The vertical detection accuracy depends on the vertical width of the aluminum foils 84, 86, which can be improved by reducing the vertical width of the aluminum foils 84, 86.

The selection switch 72 selects one of two values TH1(L) and TH1(H) with different magnitudes as the metal detection threshold TH1 and applies it to the comparison circuit 62, and the selection switch 74 selects one of the two values TH1(L) and TH1(H) having different magnitudes as the metal detection threshold TH1 and applies it to the comparison circuit 62. One of the two values TH2(L) and TH2(H) having different magnitudes is selected and applied to the comparison circuit 66. The selection switches 72 and 74 can be switched in conjunction with each other by a threshold value switching dial 76 serving as an operating means. That is, when the selection switch 72 selects the low threshold TH1(L), the selection switch 74 selects the low threshold TH2(L), and when the selection switch 72 selects the high threshold TH1(H), the selection switch 74 selects the low threshold TH1(L). Select high threshold value TH2 (H). For example, if the wiring box 82 on the back side of the wall material 80 cannot be detected while the high threshold values TH1 (H) and TH2 (H) are selected, the low threshold values TH1 (L) and TH2 can be detected using the threshold value switching dial 76. The selection switches 72 and 74 may be switched to select (L). Of course, if there is little need to change the magnitude of the threshold value TH1, the selection switch 72 may be omitted. Furthermore, if it is desired to switch the central determination threshold TH2 to one of a plurality of values without interlocking with the metal detection threshold TH1, an operating means for operating the selection switch 74 independently may be provided.

If the metal detection threshold TH1 is set to a value close to the sensor output Vm, there is a high possibility that this will be overlooked when the wiring box 82 is installed deep behind the wall material 80, such as when the wall material 80 is thick. In order to prevent this, in this embodiment, the magnitude of the metal detection threshold TH1 can be selected. Actually, there are two types of gypsum boards used as the wall material 80, 15 mm and 17 mm in thickness, so in this embodiment, two values TH1 (H) and TH1 (L) can be selected as the metal detection threshold TH1. ing.

Although the detection of the aluminum foils 84 and 86 is notified to the worker by lighting and brightness of the LED, it may be replaced by a method of notifying the worker by the frequency/volume of a tone sound, or even by using both together. Also good.

In the circuit shown in FIG. 5, the central LED 56C emits light with a brightness that corresponds to the output intensity of the adder 64. Thereby, the operator can accurately determine the horizontal center of the wiring box 82 using the light emission intensity of the center LED 56C as a guide.

When such horizontal detection accuracy is not required, the switch 70 is omitted, and the drive circuit 60C lights up the central LED 56C when the output of the AND circuit 68 is high (H), and the output of the AND circuit 68 is The light may be turned off when the power is low (L). Even with this configuration, the user can infer the horizontal center of the wiring box 82 from the lighting state of the center LED 56C during the lateral movement of the detection and perforation unit 14.

When the wiring box 82 can be detected in front of the detection and perforation unit 14 in this way, the operator can resist the tension force of the compression spring 54 and insert the perforation rods 44A and 44B into the wall material 80 as shown in FIG. The detection and perforation unit 14 is pressed against the wall material 80 until it pierces. At this time, the sensor holding frame 52 is retreated to a position where it is housed in the outer frame 24 with its tip end surface in contact with the wall material 80. By piercing the wall material 80 with the puncture rods 44A and 44B, the detection perforation unit 14 is locked or fixed to the wall material 80 so as not to move laterally with respect to the wall material 80, and the detection perforation unit 14 is also fixed to the wall material 80 by rotation of the motor 20. becomes difficult to rotate. FIG. 9 shows a vertical cross-sectional view of a state in which the detection and perforation unit 14 is locked to the wall material 80 by piercing the wall material 80 with the tips of the puncture rods 44A and 44B.

When the operator further presses the punching device 10 perpendicularly against the wall material 80 from the position shown in FIG. moves backward, and eventually the tip surfaces of the cutting plates 34, 36, 38, and 40 come into contact with the wall material 80.

From the position shown in FIG. 9 until the tip surfaces of the cutting plates 34, 36, 38, and 40 come into contact with the wall material 80, the operator pushes the lever 18 with his or her index finger. By this operation, the drive circuit 78 rotates the motor 20 according to the output power of the battery 16. The motor 20 rotates the rotating shaft 22, and due to the eccentric weight 32, the rotating shaft 22 rotates while its tip wobbles laterally. The amount of wobbling depends on the rotation speed of the rotating shaft, the eccentricity and weight of the eccentric weight 32, and the like. This vibration is transmitted to the cutting plate support plate 28 via the bearing 30, causing periodic and minute lateral vibrations in the cutting plates 34, 36, 38, and 40 and surface vibration at the tip.

When the tip surfaces of the cutting plates 34, 36, 38, 40 are in contact with the wall material 80, the edges of the tip surfaces of the cutting plates 34, 36, 38, 40 cut the wall material 80, as shown in FIG. . FIG. 10 is a schematic diagram showing how the wall material 80 is cut due to the lateral vibration of the cutting plates 34, 36, 38, and 40 and the surface wobbling of the tips. In FIG. 10, broken lines indicate the cutting plates 34, 36, 38, and 40 at positions where they have been moved laterally and their surfaces have been shaken. The cutting width corresponds to the surface wobbling width, and by adjusting the rotation speed of the motor 20 and the eccentric weight 32, the cutting width can be made smaller. Further, since the slits 34A, 36A, 38A, and 40A cause surface runout in units of cutting pieces, the cutting ability is improved compared to the case where no slits are provided.

The operator can feel that the cutting plates 34, 36, 38, and 40 have penetrated the wall material 80, and at this stage, the operator points the perforation device 10 (detection perforation unit 14) toward the wall material. The pressing is finished and the wall material 80 is pulled back. FIG. 11 shows a cross-sectional view of the detection and perforation unit 14 and the wall material 80 in a state where the cutting plates 34, 36, 38, and 40 have penetrated the wall material 80.

As described above, the drilling device 10 allows a series of operations from detecting the wiring box 82 to drilling a rectangular hole in the wall material 80 for accessing the wiring box 82 to be completed with a single device. This greatly improves work efficiency. A rectangular hole can be made in a single drilling operation, and subsequent wiring work with a decorative panel on the surface of the wall material is also facilitated. Since the hole is drilled by the vibration of the cutting plate rather than the saw blade, there are fewer chips, making it easier not only to drill the hole but also to clean up the site afterwards.

FIG. 12 shows a front view of a modified example 114 of the detection and drilling unit. In the detection perforation unit 114 shown in FIG. 12, metal sensors 150UR and 150UL are arranged on the upper side of the sensor holding frame 12 at the same positions as the metal sensors 50UR and 50UL, and on the lower side, instead of the metal sensor 50D, Two metal sensors 150DR and 150DL are arranged at the same distance as metal sensors 150UR and 150UL. The metal sensors 150UR and 150UL are arranged in the same positional relationship as the metal sensors 50UR and 50UL and have the same functions, but are given different symbols for easy understanding. Metal sensors 150UR, 150UL, 150DR, 150DL have the same characteristics with respect to metal as metal sensors 50UR, 50UL, 50D. By arranging the metal sensors at the four corners of the rectangle in this way, even if the wiring box 82 hidden behind the wall material 80 is tilted from the horizontal or vertical line, the center can be detected with high accuracy including that direction. .

FIG. 13 shows an example of a circuit that processes the outputs of metal sensors 150UR, 150UL, 150DR, and 150DL.

The upper right LED 156UR, like the upper right LED 56UR, indicates the metal detection status of the upper right metal sensor 150UR, and the upper left LED 156UL, like the upper left LED 56UL, indicates the metal detection status of the upper left metal sensor 150UL. The lower right LED 156DR indicates the metal detection status of the lower right metal sensor 150DR, and the lower left LED 156DL indicates the metal detection status of the lower left metal sensor 150DL. The LEDs 156UR, 156UL, 156DR, and 156DL are arranged at the four corners in the same positional relationship as the corresponding metal sensors 150UR, 150UL, 150DR, and 150DL, and the central LED 156C is located at the center of the rectangle made up of these LEDs 156UR, 156UL, 156DR, and 156DL. will be placed in Although the details will be described later, the center LED 156C lights up at a position where the detection and perforation unit 114 faces the front of the wiring box 82 on the back side of the wall material 80.

The drive circuits 160UR, 160UL, 160DR, 160DL respectively follow the outputs of the metal sensors 150UR, 150UL, 150DR, 150DL, so that the larger the output value of the metal sensors 150UR, 150UL, 150DR, 150DL, the brighter the LEDs 156UR, 156UL. , 156DR, and 156DL. The operation of drive circuits 160UR, 160UL, 160DR, and 160DL is the same as that of drive circuits 60UR and 60UL.

The drive circuits 160UR, 160UL, 160DR, 160DL control the LEDs 156UR, 156UL, 156UL, with a brightness according to the sensor output level of the corresponding metal sensor 150UR, 150UL, 150DR, 150DL when the input sensor output is equal to or higher than the metal detection threshold TH1. 156DR and 156DL may be turned on. This can prevent the LEDs 156UR, 156UL, 156DR, and 156DL from lighting up when the metal sensors 150UR, 150UL, 150DR, and 150DL detect a minute metal member such as a nail.

An operator moves the detection and perforation unit 114 vertically and horizontally along the wall material 80, which is generally erected vertically. Due to this movement, either metal sensor 150UR or 150UL detects aluminum foil 84 or 86, and drive circuit 160UR or 160UL lights up one or both of upper right LED 156UR and upper left LED 156UL. Similarly, either metal sensor 150DR or 150DL detects aluminum foil 84 or 86, and drive circuit 160DR or 160DL lights up one or both of lower right LED 156DR and lower left LED 156DL. With one or both of the upper right LED 156UR and the upper left LED 156UL on, and with one or both of the lower right LED 156DR and the lower left LED 156DL on, the detection and perforation unit 114 roughly cuts through the wiring box 82 on the back side of the wall material 80. This means that it was detected.

Adder 164U adds or combines the sensor outputs of metal sensors 150UR and 150UL. The output of the adder 164U is similar to the output of the adder 64 (FIG. 8(c)) with respect to the horizontal movement of the detection perforation unit 114. It has a peak when facing the horizontal center position of. The position of the maximum value of this peak (approximately 2 Vm in the illustrated example) corresponds to the center (horizontal center) of the wiring box 82 that is the detection target.

Comparison circuit 166U compares the output of adder 164U with central determination threshold TH2. The comparison circuit 166U sets the output to high (H) when the output of the adder 164U is equal to or higher than the central determination threshold TH2, and sets the output to low (L) otherwise. As in the first embodiment, the central determination threshold TH2 is set to a value that is larger than the sensor output value Vm during metal detection and lower than the peak value of the adder 164U.

Instead of the comparison circuits 166U and 166D, four comparison circuits are provided to compare the sensor outputs of the metal sensors 150UR, 150UL, 150DR, and 150DL with the metal detection threshold TH1, and the AND circuit 168 compares two of these four alternative comparison circuits. The logical product of the value outputs may also be taken.

Adder 164D adds the sensor outputs of metal sensors 150DR and 150DL. The output of the adder 164D is similar to the outputs of the adders 64 and 164U when the detecting and perforating unit 114 moves horizontally. When facing the position, it has a peak. The position of the maximum value of this peak (approximately 2 Vm in the illustrated example) corresponds to the center (horizontal center) of the wiring box 82 that is the detection target. Comparison circuit 166D compares the output of adder 164D with central determination threshold TH2. The comparison circuit 166D sets the output to high (H) when the output of the adder 164D is equal to or higher than the central determination threshold TH2, and sets the output to low (L) otherwise.

Adder 165 adds the outputs of adders 164U and 164D. The output of the adder 165 is maximum, approximately 4 Vm, when all four metal sensors 150UR, 150UL, 150DR, and 150DL are detecting metal.

The AND circuit 168 takes the AND of the binary outputs of the comparison circuits 166U and 166D. That is, the AND circuit 168 makes the output high (H) only when the outputs of the comparison circuits 166U and 166D are both high (H), and makes the output low (L) in other cases. The normally open switch 170 is in a closed (on) state when the output of the AND circuit 168 is high (H), and is in an open (off) state when the output of the AND circuit 168 is low (L).

The output of adder 165 is applied via switch 170 to drive circuit 160C for center LED 156C. That is, the output of the adder 165 is applied to the drive circuit 160C only when the detection and perforation unit 114 can almost detect the center of the wiring box 82 (when the outputs of the comparison circuits 166U and 166D are both high (H)). be done. The drive circuit 160C causes the central LED 156C to emit light at a brightness that corresponds to the output value of the adder 165 input via the switch 170. The lighting and luminance of the central LED 156C allows the operator to know that the detection and perforation unit 114 is facing the horizontal and vertical center of the wiring box 82 located on the back side of the wall material 80.

The switch 170 may be closed when the output of the adder 165 is above a certain level, but the output level of the adder 165 when the center of the wiring box 82 is detected depends on the thickness and material of the wall material 80. It is difficult to determine the threshold value. Since the output level changes of adders 164U and 164D depending on the environment in which they are used are smaller than that of adder 165, the circuit configuration shown in FIG. 13 is more applicable to a wide range of environments.

In the configuration shown in FIGS. 12 and 13, the upper metal sensor and the lower metal sensor detect the aluminum foils 84 and 86, respectively, so that, for example, the center of the wiring box 82, which is arranged at an angle from the horizontal and vertical lines, is can also be easily detected.

The selection switch 174 selects one of two values TH2(L) and TH2(H) having different magnitudes as the central determination threshold TH2, and applies the selected value to the comparison circuits 166U and 166D. The user can switch the selection switch 174 using a threshold switching dial 176 as an operating means. For example, if the wiring box 82 on the back side of the wall material 80 cannot be detected when the high threshold value TH2 (H) is selected, the selection switch is set using the threshold value switching dial 176 to select the low threshold value TH2 (L). All you have to do is switch 174.

Although the detection of the aluminum foils 84 and 86 is notified to the operator by lighting and brightness of the LED, this may be replaced by a method of notifying the user by the frequency/volume of a tone sound, or even a combination of both. good.

In the circuit configuration shown in FIG. 13, the central LED 156C emits light with a brightness that corresponds to the output intensity of the adder 165. Thereby, the user of the drilling device of the detection drilling unit 114 can accurately determine the horizontal center of the wiring box 82 using the light emission intensity of the center LED 156C as a guide.

When such horizontal detection accuracy is not required, the adder 165 and switch 170 are omitted, and the drive circuit 160C lights up the center LED 156C when the output of the AND circuit 168 is high (H), and the AND circuit 168 The light may be turned off when the output is low (L). Even with this configuration, the operator can estimate the horizontal center of the wiring box 82 from the lighting state of the center LED 156C during the lateral movement of the detection and perforation unit 114.

Some metal sensors have a high output value when not detecting metal, and a low output value when detecting metal.

Regarding the first embodiment, if the metal sensors 50UR, 50UL, and 50D have such characteristics, the metal detection threshold TH1, the central determination threshold TH2, and the operations of the comparison circuits 62 and 66 are changed as follows. good.

The output of the metal sensors 50UR, 50UL, and 50D when not detecting metal is V0, and the output when detecting metal is Vm (<V0). The output of the adder 64 is 2V0 when neither of the metal sensors 50UR and 50UL detects metal, and V0+Vm when only one of the metal sensors 50UR and 50UL detects metal. When both detect metal at the same time, the maximum is approximately 2Vm. Therefore, the metal detection threshold TH1 may be set to an intermediate value between 2V0 and V0+Vm, preferably a value close to 2V0, and the central determination threshold TH2 may be set to an intermediate value between V0+Vm and 2Vm, preferably a value close to V0+Vm.

The comparison circuit 62 sets the output to low (L) when the output of the metal sensor 50D is equal to or higher than the metal detection threshold TH1, and sets the output to (H) when the output of the metal sensor 50D falls below the metal detection threshold TH1. The comparator circuit 66 makes the output low (L) when the output of the adder 64 is equal to or higher than the threshold TH2, and makes the output high (H) when the output of the adder 64 is less than the central determination threshold TH2. The operations of the AND circuit 68 and the switch 70 are similar to those in the first embodiment.

Drive circuits 60UR, 60UL, 60UD, and 60C drive LEDs 56UR, 56UL, 56D, and 56C with characteristics opposite to those of the first embodiment in response to input signals. That is, the drive circuits 60UR, 60UL, and 60UD light up the LEDs 56UR, 56UL, and 56D more brightly as the difference value between the input value and the sensor output V0 when no metal is detected increases. The drive circuit 60C lights up the LED 56C more brightly as the difference value between the input value and the adder output 2V0 when metal is not detected becomes larger.

In Embodiment 2, when metal sensors 150UR, 150UL, 150DR, and 150DL have characteristics such that they have a high output when no metal is detected and a small output value when metal is detected, the central determination threshold TH2 Since the operations of the comparator circuits 166U and 166D may be changed in the same manner, a detailed explanation will be omitted.

In the above embodiment, both the sensor holding frame 52 and the puncturing rods 44A, 44B are retracted into the exterior 24 by pressing the exploration drilling units 14, 114 against the wall material 80, but during exploration, Alternatively, a stopper may be provided that prevents the sensor holding frame 52 from retreating and can release the inhibition of retreat by a predetermined operation. For example, the configuration is such that movement restriction by the stopper is released by operating the lever 18.

A modification of the movement restricting means that restricts the movement of the punching device along the wall material 80 during cutting will be described. FIG. 14 is a sectional view of a modification of the movement regulating means, in which (a) shows the position of the puncture rod during detection, and (b) shows the position of the puncture rod during drilling. Reference numerals 244A and 244B indicate puncture rods that are substitutes for the puncture bars 44A and 44B, respectively, and reference numerals 248A and 248B indicate compression springs that are substitutes for the compression springs 48A and 48B, respectively.

In the modification shown in FIG. 14, the tip portions of the puncture rods 244A, 244B are formed into needle-like or cone-like shapes with shallow apex angles so that the puncture rods 244A, 244B can penetrate deeper into the wall material 80. As the wall material 80, gypsum board with a thickness of 12 mm or 15 mm is usually used. For such a gypsum board, for example, the tip portions of the puncture rods 244A and 244B are formed into a conical shape with a length of 15 to 20 mm and a diameter of about 5 mm. At the same time, the spring strengths of the compression springs 248A and 248B are adjusted to such an extent that the puncture rods 244A and 244B are biased toward the wall material 80 with a force that allows them to bite into the wall material 80 when punching the wall material 80.

Furthermore, the puncture rods 244A and 244B are made of a highly rigid material that does not cause or is difficult to cause shaft wobbling. As a result, when the puncture rods 244A, 244B are pressed against the wall material 80 while drilling, the puncture rods 244A, 244B are pressed against the wall material 80 regardless of the vibration caused by the vibration motor (motor 20, rotating shaft 22, eccentric weight 32). It is inserted stably in the same position. Thereby, the puncture rods 244A, 244B can effectively suppress or restrict the relative movement of the wall material 80 in the planar direction when drilling with the cutting plates 34, 36, 38, 40.

By forming the tip of the puncture rod into a needle-like or cone-like shape to make it easier to bite into the wall material, movement in the planar direction of the wall material 80 can be effectively restricted even by vibrations during drilling. In other words, the vibrations exerted on the hand holding the drilling device during drilling can be reduced, and the hand-held work of the worker can be facilitated.

Even if a puncture rod having a structure in which a plurality of minute awls are erected on the tip surface of the bar material in place of the puncture rods 44A, 44B, 244A, and 244B is used, the same problem as in Embodiment 4 will occur during drilling. The movement of the wall material 80 in the planar direction can be effectively restricted during this process.

Although the invention has been described above with reference to specific illustrative embodiments, various changes and modifications may be made to the embodiments described above without departing from the technical scope of the invention as defined in the claims. It will be obvious to those skilled in the art that the present invention can be modified, and such changes and modifications are also included in the technical scope of the present invention.

10: Perforation device 12: Grip section 14: Detection perforation unit 16: Battery 18: Lever 20: Motor 22: Rotating shaft 24: Exterior 26: Bearing 28: Cutting plate support plate 30: Bearing 32: Eccentric weights 34, 36, 38 , 40: Cutting plate 34A, 36A, 38A, 40A: Slit 42A, 42B: Opening 44A, 44B: Puncture rod 46A, 46B: Support column 48A, 48B: Compression spring 50UR, 50UL, 50D: Metal sensor 52: Sensor holding frame 54: Compression spring 56UR: Upper right LED (light emitting diode)
56UL: Upper left LED
56C: Central LED
56D: Lower LED
60UR, 60UL, 60C: Drive circuit 62, 66: Comparison circuit 64: Adder 68: AND circuit 70: Normally open switch 72, 74: Selection switch 76: Threshold switching dial 80: Wall material 82: Wiring box 84, 86: Aluminum foil 114: Detection perforation unit 150UR, 150UL, 150DR, 150DL: Metal sensor 156UR: Upper right LED (light emitting diode)
156UL: Upper left LED
156C: Central LED
156DR: Lower right LED
156DL: Lower left LED
160UR, 160UL, 160DR, 160DL, 160C: Drive circuit 164U, 164D, 165: Adder 166U, 166D: Comparison circuit 168: AND circuit 170: Normally open switch 174: Selection switch 176: Threshold value switching dial 244A, 244B: Puncture rod 248A, 248B: Compression spring

Claims (14)

Detection means (50UR, 50UL, 50D, 150UR, 150UL, 150DR, 150DL) that non-contact detects the wiring box (82) placed on the back side of the wall material (80);
Movement regulating means (44A, 44B, 46A, 46B, 48A, 48B, 244A, 244B, 248A, 248B) that regulates movement along the wall material (80) during drilling after detection by the detection means;
Puncturing means (20, 22, 28, 32, 34, 36, 38, 40) for making a rectangular hole in the wall material (80) that allows access to the wiring box (82);
A punching device comprising:
The wiring box (82) has a first metal plate (84) on the upper side of the surface facing the wall material (80) and a second metal plate (86) on the lower side,
The detection means includes a plurality of metal sensors (50UR, 50UL, 50D, 150UR, 150UL, 150DR, 150DL) capable of simultaneously detecting the first and second metal plates (84, 86), and a front end of the metal sensor. a first urging means (54) that constantly urges the sensor holding means (52) toward the wall material (80); and the wiring box (82). comprises determining means (64, 66, 68) for determining that the operator is in the front position, and notification means (60C, 56C) for notifying the operator of the determination result of the determining means;
The movement regulating means includes two or more puncturing means (44A, 44B, 244A, 244B) having tips that can pierce the wall material, and the two or more puncturing means are always attached toward the wall material (80). and second biasing means (48A, 48B, 248A, 248B) for biasing the
The perforation means includes four cutting plates (34, 36, 38, 40) arranged on the four sides of a rectangle that can cut the wall material with its tip end, and a cutting plate that supports the four cutting plates. It includes a plate support means (28) and a vibration motor (20, 22, 32) that vibrates the four cutting plates via the cutting plate support means.
A punching device characterized by: In the state before detection, the front end of the sensor holding means is located at a position closer to the wall material (80) than the tip of the puncturing means, and the tip of the puncturing means is located closer to the tip of the four cutting plates. The drilling device according to claim 1 , characterized in that the drilling device is located at a position closer to the wall material (80) than the surface. Claim 1 or 2, wherein the puncture means (44A, 44B, 244A, 244B) has one or more needle-shaped or cone-shaped tips capable of biting into the wall material ( 80 ). The perforating device described in . The detection means is
first and second metal sensors (50UR, 50UL) arranged laterally apart by a distance corresponding to the width of one of the first and second metal plates;
A third metal sensor disposed at a position corresponding to the widthwise center of the other of the first and second metal plates, the third metal sensor being located between the first metal plate and the second metal plate. a third metal sensor (50D) arranged vertically apart from the first and second metal sensors by a distance corresponding to the distance;
and
The drilling device according to any one of claims 1 to 3 , wherein the determining means determines that the first, second, and third metal sensors simultaneously indicate a metal detection state. . The determination means is
Adding means (64) for adding the sensor outputs of the first and second metal sensors;
a first comparing means (62) that determines whether or not the third metal sensor is in the metal detection state by comparing the output of the third metal sensor with a metal detection threshold TH1;
a second comparing means (66) for determining whether or not the first and second metal sensors are simultaneously in the metal detection state by comparing the output of the adding means with a central determination threshold TH2;
According to the comparison results of the first and second comparison means, when the first, second and third metal sensors are simultaneously in the metal detection state, the notification means (60C, 56C) indicates that the wiring box Control means (68) for notifying the user of frontal detection
The drilling device according to claim 4 , characterized in that it has: The determination means is
Adding means (64) for adding the sensor outputs of the first and second metal sensors;
By comparing the outputs of the first, second, and third metal sensors with a metal detection threshold TH1, it is determined whether each of the first, second, and third metal sensors is in the metal detection state. comparison means,
According to the comparison result of the comparison means, when the first, second, and third metal sensors are simultaneously in the metal detection state, the notification means (60C, 56C) notifies the user of detection of the front of the wiring box. Control means for notification (68)
The drilling device according to claim 4 , characterized in that it has: The control means (68) causes the notification means (60C, 56C) to respond to the output of the addition means (64) when the first, second and third metal sensors are in the metal detection state at the same time. The punching device according to claim 5 or 6 , wherein the punching device outputs the notification depending on the intensity. The notification means includes first, second and third display means (56UR, 56UL, 56D) that display sensor output intensities of the first, second and third metal sensors (50UR, 50UL, 50D). The drilling device according to any one of claims 4 to 7 , characterized in that: The detection means is
first and second metal sensors (150UR, 150UL) arranged laterally apart by a distance corresponding to the width of one of the first and second metal plates;
third and fourth metal sensors (150DR, 150DL) arranged laterally apart from each other by a distance corresponding to the width of the other of the first and second metal plates; Third and fourth metal sensors (150DR, 150DL) arranged vertically apart from the first and second metal sensors by a distance corresponding to the distance between them and the second metal plate.
and
A claim characterized in that the determining means (164U, 164D, 166U, 166D, 168) determines that the first, second, third, and fourth metal sensors simultaneously indicate a metal detection state. The punching device according to any one of Items 1 to 3 . The determination means is
a first addition means (164U) for adding sensor outputs of the first and second metal sensors;
a second addition means (164D) for adding sensor outputs of the third and fourth metal sensors;
a third addition means (165) for adding the outputs of the first and second addition means;
a first comparison means (166U) that determines whether both the first and second metal sensors are in the metal detection state by comparing the output of the first addition means with a threshold TH2; ,
a second comparison means (166D) for determining whether both the third and fourth metal sensors are in the metal detection state by comparing the output of the second addition means with a threshold TH2; ,
According to the comparison results of the first and second comparison means, when the first, second, third and fourth metal sensors are simultaneously in the metal detection state, the notification means (160C, 156C) Control means (168) for notifying the user of detection of the front of the wiring box
The drilling device according to claim 9 , characterized in that it has: The control means (168) causes the notification means (160C, 156C) to send the third addition means (165 ) The punching device according to claim 10 , wherein the notification is outputted at an intensity corresponding to the output of the punching device. The determination means is
Adding means (164U, 164D, 165) for adding sensor outputs of the first, second, third and fourth metal sensors;
By comparing the outputs of the first, second, third, and fourth metal sensors with the metal detection threshold TH1, each of the first, second, third, and fourth metal sensors is in the metal detection state. a comparison means for determining whether or not;
According to the comparison result of the comparison means, when the first, second, third, and fourth metal sensors are simultaneously in the metal detection state, the notification means (160C, 156C) detects the detection of the front of the wiring box. Control means (168) for notifying the user of
The drilling device according to claim 9 , characterized in that it has: The control means (168) transmits the output of the addition means (165) to the notification means (160C, 156C) when the first, second, third, and fourth metal sensors are simultaneously in the metal detection state. 13. The punching device according to claim 12 , wherein the punching device outputs the notification with an intensity corresponding to the amount of the notification. The notification means includes first, second, third and fourth notification means that display sensor output intensities of the first, second, third and fourth metal sensors (150UR, 150UL, 150DR, 150DL). (156UR, 156UL, 156DR, 156DL), The drilling device according to any one of claims 9 to 13 .

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