JP2003011114A - Boring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring device which is light in weight and easy of handling. SOLUTION: A boring device main body 1 is composed of a boring tool 3 having a bit 15 at its tip and a direct motor 2. A cooling fluid supply apparatus 5 for supplying a cooling fluid to the tip of the boring tool 3 and a motor power source 4 are installed integrally in a supply unit 6 and separately from the main body 1. A lead wire 28 to be installed between the motor power source 4 and the main body 1 and a tube 24 to be installed between the supply apparatus 5 and the main body 1 are installed to be contacted adjacently with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a perforating device which is particularly suitable for use in perforating tiles, joints and the like of tiled walls.

[0002]

2. Description of the Related Art In order to prevent exfoliation of tiles due to the deterioration of a building whose outer wall is tiled, holes are formed by piercing tiles or joints between tiles to reach a concrete wall as a base. It is practiced to inject resin into the back side of the tile that is about to come off from the hole to fix the tile. For such drilling of tiles and joints of tiles, for example, a small electric drill for drilling concrete is used.

However, the usual electric drill vibrates the drill at the time of drilling and drills while crushing an object to be drilled like a hammer, which rather promotes stripping of tiles.
It has the drawback of damaging the outer wall. Therefore,
A bit formed by dispersing superabrasive grains in cemented carbide or a binder phase is provided with a drilling tool provided at the tip of a rod-shaped or cylindrical tool body, and this drilling tool is driven to rotate about its axis. A piercing device with a rotary drive may be used.

Such a drilling device has a drawback that the drilling speed is slower than that of a general electric drill because the drill bit is drilled while the bit at the tip grinds the object to be drilled. Therefore, it has been attempted to reduce the resistance between the bit and the object to be drilled by rotating the drilling tool at a high speed to drill the object to be drilled at a high speed. Here, a DC type motor is used as a rotary drive device that rotationally drives the drilling tool with high torque and high speed.

[0005]

By the way, the motor power supply for supplying the electric current to the motor is provided separately from the main body of the punching device provided with the punching tool and the motor, whereby the weight saving and workability of the punching device are achieved. It is usual that the improvement of Therefore, between the motor power source and the main body of the punching device, a conductor having a length that does not hinder the work for supplying current to the motor (may be referred to as current supply line in the specification). ) Is provided. Since this conductor wire has to be thick according to the electric current passed through the motor, there is a problem in that the weight of the perforation apparatus as a whole increases and the workability particularly when the conductor wire is routed deteriorates.

[0006] The motor power source is usually of a type that converts the alternating current obtained from the wiring laid in the building to be constructed into a direct current to supply a current to the motor. If the distance from the insertion point to the construction site is far, the cable will need to be that long, and it will be necessary to carry the cable, lay it, and even work while pulling the cable, especially in buildings such as high-rise condominiums. The efficiency is significantly impaired. If you want to shorten the length of the cable, you have to change the electrical outlet each time you change the location, which is extremely inconvenient, and if there is no electrical outlet nearby,
There was a problem that the construction itself became impossible.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a light-weight punching device having excellent handleability. Particularly, it is to provide a punching device capable of reducing the weight of the current supply line. Another object of the present invention is to provide a punching device that can work efficiently regardless of the position of wiring laid in a building.

[0008]

In order to achieve the above object, the present invention adopts the following configurations. That is, the drilling device according to claim 1 has a drilling tool having at its tip a bit for drilling an object to be drilled, a motor for rotationally driving this drilling tool, and a cooling device for supplying a cooling fluid to the tip of the drilling tool. A drilling device comprising a fluid supply device and a motor power supply for supplying a current to the motor, wherein the drilling tool and the motor are provided in a drilling device body, and the cooling fluid supply device and the motor power supply are provided. Is provided separately from the punching device body, and a cooling fluid supply pipe is provided between the punching device body and the cooling fluid supply device, the cooling fluid passing through the inside and the outside being kept at a low temperature. In addition, a current supply line through which a current flows is provided between the punching device body and the motor power supply, and the cooling fluid supply pipe and the current supply line are provided so as to be adjacent to each other. It is characterized in.

With such a configuration, the current supply line is cooled by the cooling fluid supply pipe, and the electric resistance can be reduced to increase the density of the current flowing per unit area. It is possible to reduce the weight by reducing the weight. Usually, the punching device includes a cooling fluid supply device that supplies a cooling fluid to the tip of the bit in order to cool the bit while discharging chips. The cooling fluid is, for example, a liquid such as water or a gas such as air. Therefore, the cooling fluid supply device includes a pump for delivering the cooling liquid, a compressor for compressing and cooling the air, and a cooling device. As described above, the cooling fluid supply device including the pump, the compressor, etc. is usually
The punching device body is provided separately from the punching device body to reduce the weight of the punching device body. Therefore, a cooling fluid supply pipe through which the cooling fluid passes is provided between the cooling fluid supply device and the punching device body. In the present invention, the cooling fluid supply pipe is made of a material having good thermal conductivity, the outside thereof is maintained at a low temperature, and further, since the cooling fluid supply pipe and the current supply line are provided adjacent to each other, the current The supply line is cooled by the cooling fluid. As a result, an increase in temperature of the current supply line is suppressed and an increase in electrical resistance is also suppressed. Therefore, it is not necessary to thicken the current supply line in advance, and it is possible to make the wire thin. In this way, the weight of the current supply line can be reduced, the weight of the punching device can be reduced, and the handleability can be improved.

According to a second aspect of the present invention, in the punching apparatus according to the first aspect, the motor is a DC motor, and the motor power source includes a battery that supplies current to the motor. , The potential difference between the electrodes is 24V, and at least the instantaneous maximum current 15
It is characterized in that the current of A is provided so that it can be supplied.

With such a configuration, current is supplied from the battery to the motor, it is not necessary to supply alternating current to the motor power supply, and a cable from the electricity inlet to the motor power supply is unnecessary. Therefore, it is possible to work efficiently regardless of the wiring laid in the building. In the DC motor, when the bit comes into contact with a reinforcing bar or the like during the drilling work and the rotation of the drilling tool suddenly stops, a counter electromotive force is not generated, so that a high current instantaneously flows from the battery to the motor. Therefore, the potential difference between the electrodes of the battery is set to 24 V, and the battery has a sufficient capacity to supply the instantaneous maximum current of 15 A.

According to a third aspect of the present invention, in the punching apparatus according to the second aspect, the motor power source is configured to convert an alternating current input from the outside into a direct current and supply a current to the motor. It is characterized in that

When only the battery is used, there is a limit to the working time depending on the amount of electricity stored in the battery. With such a structure, electric power can be obtained from the wiring laid in the building. As a result, work time is extended and convenience is increased. The motor power supply is provided so as to convert alternating current from the electricity inlet into direct current. Here, the motor power supply may be configured such that the battery is charged when current is not supplied from the battery.

According to a fourth aspect of the present invention, in the punching device according to any one of the first to third aspects, the cooling fluid supply device and the motor power source are integrally provided. Is characterized by.

With such a structure, the cooling fluid supply device and the motor power supply can be handled as one unit, so that the convenience is improved.

The invention according to claim 5 is provided with a drilling tool having a bit for drilling an object to be drilled at its tip, a motor for rotationally driving the drilling tool, and a motor power supply for supplying a current to the motor. A punching device, wherein the motor is
The motor is a direct current motor, and the motor power supply includes a battery that supplies a current to the motor. The battery has a potential difference between electrodes of 24 V and is provided to supply at least an instantaneous maximum current of 15 A. It is characterized by being

With such a configuration, current is supplied from the battery to the motor, it is not necessary to supply alternating current to the motor power supply, and a cable from the electricity inlet to the motor power supply is unnecessary. Therefore, it is possible to work efficiently regardless of the wiring laid in the building. In the DC motor, when the bit comes into contact with a reinforcing bar or the like during the drilling work and the rotation of the drilling tool suddenly stops, a counter electromotive force is not generated, so that a high current instantaneously flows from the battery to the motor. Therefore, the potential difference between the electrodes of the battery is set to 24 V, and the battery has a sufficient capacity to supply the instantaneous maximum current of 15 A.

According to a sixth aspect of the present invention, in the punching device according to any one of the first to fifth aspects, the motor has a rotary shaft through which the drilling tool is mounted, is passed through at a tip portion thereof. It is characterized in that it is provided with a cylindrical rotor integrally provided and a cylindrical stator provided on an outer peripheral surface of the rotor.

As described above, in the present invention, since the drilling tool is directly attached to the rotary shaft of the rotor without using a gear or the like, there is no loss of work in the rotation transmission system and the output power of the motor is used as it is. The output power can be used, and the drilling tool can be rotated with high torque and at high speed. Further, it is possible to reduce the size and weight of the punching device.

According to a seventh aspect of the present invention, in the punching device according to any one of the first to sixth aspects, the main body of the punching device has a gripping portion that can be gripped by hand, and the gripping portion. And a switch for starting and stopping the motor are provided adjacent to.

With such a configuration, it is possible to work while holding the punching device in the hand, and it is possible to improve workability. Further, since the switch for starting and stopping the motor is provided adjacent to the grip portion, the operation of starting and stopping the punching can be performed at hand, and the workability is improved. Further, this switch may be provided at the position of the finger in the state where the grip portion is gripped by the hand. As a result, the switch can be operated with a finger while holding the grip portion, and operability is improved.

[0022]

DETAILED DESCRIPTION OF THE INVENTION A punching device according to the present invention will be described below with reference to the drawings. 1 and 2, reference numeral 1
Is a body of the punching device, reference numeral 2 is a direct current type DC motor (motor) which is rotated by being supplied with a direct current, reference numeral 3 is a drilling tool, reference numeral 4 is a motor power source, and reference numeral 5 is a cooling fluid supply device.

The direct motor 2 and the drilling tool 3 together form a drilling device body 1, while the motor power source 4
The cooling fluid supply device 5 and the cooling fluid supply device 5 are integrally provided as a supply unit 6 and are provided separately from the punching device body 1.

The direct motor 2 is, as shown in the figure,
A rotary shaft 11 is provided at the center thereof, and an adapter 12 is detachably screwed to a threaded portion 11a formed at the front end of the rotary shaft 11 at the front end of the rotary shaft 11.
A rod-shaped drilling tool 3 is detachably screwed on the rod 2. Thus, the direct motor 2 and the drilling tool 3 are provided in the punching device body 1.

Here, the adapter 12 has a hollow, substantially cylindrical shape, and has a female screw portion 12a screwed into the screw portion 11a at the tip of the rotary shaft 11 on the base end side, and a drilling tool 3 on the tip end side. The female screw portion 12b to which the base end of the
Are provided along the direction of the axis O. Here, the female screw portion 12a is formed in a direction in which the female screw portion 12a is fastened to the rotating shaft 11 by the rotation at the time of punching.

The drilling tool 3 has a diameter of 3 to 15 mm.
A bit 15 is attached to the tip of the tool body 14 of the above. The bit 15 has a shape in which a part of the disk is cut out in a wedge shape from the periphery to the center, and is formed by sintering a binder material such as a metal bond, a resin bond, or a vitrified bond. Cemented carbide or superabrasive grains (diamond grains or C
BN abrasive grains) are dispersed and formed. Alternatively, superabrasive grains are dispersed and formed in the bond phase by electrodeposition. Then, the drilling tool 13 having such a bit 15 attached to the tip thereof is rotationally driven around the axis line and sent to the tip side in the axial direction, thereby punching an excavation object made of a brittle material such as tiles or joints of tiles. Is configured to.

Along with the axis of the tool body 14, the cooling fluid hole 14 through which the cooling fluid passes toward the bit 15 during drilling.
a is drilled, and further, at the tip thereof, a bit 15
An opening 14b that opens at the notched portion is formed, and the cooling fluid released at the opening 14b is supplied between the bit 15 and the object to be excavated. On the other hand, at the tip of the rotary shaft 11, the cooling fluid hole 1 of the drilling tool 3 is provided.
A through hole 11a through which the cooling fluid flows is formed along the axis so as to communicate with 4a.

At the base end side of the drilling tool 3, the adapter 1
A male screw portion 3a screwed into the two female screw portions 12b is formed along the axial direction of the drilling tool 3. Here, the male screw portion 3a is formed in a direction in which the drilling tool 13 is tightened to the adapter 12 by the rotation of the drilling tool 3 during drilling.

The direct motor 2 is a direct type motor having an output of 400 W or less for directly rotating the drilling tool 3 which is a tool directly connected to the rotary shaft 11 without using a rotation transmission mechanism such as a gear, and has a diameter of 3 mm or more and less than 15 mm. while the perforation tool 3, is pressed against the object to be excavated under a pressure in the range of 0.6N / mm ² ~6N / mm ² at the time of drilling, 300 meters /
It is configured to be rotatable at a peripheral speed of min to 2000 m / min.

The direct motor 2 includes a rotor 17 in which a coil coated with a heat resistant resin such as polyimide is wound in a housing 16, and the rotor 17
And a cylindrical stator 18 having a permanent magnet. And the rotating shaft 1
1 is an insertion hole 17a formed at the center of the rotor 17
It is inserted so as to be press-fitted inside, and is integrally fixed to the rotor 17.

The magnet of the stator 18 is 100 kJm ^-3 , which has a much higher maximum magnetic energy product than a commonly used ferrite magnet or alnico magnet so that a small size, light weight, and high torque can be obtained. The high density magnets of neodymium / iron / boron series or samarium / cobalt series rare earth metals mentioned above are used. The diameter of the rotor 17 is smaller than its length.

Housing 1 for housing direct motor 2
Bearings 19a, 19 for rotatably supporting the rotor 12 are provided inside the rear end wall portion 16a and the front end wall portion 16b.
b are installed respectively. That is, the bearing 19a,
19b supports the vicinity of the upper and lower ends of the rotary shaft 11 inserted through the center of the rotor 17,
Also, the rotary shaft 11 is configured to be able to receive a thrust-direction force and a radial-direction force that act on the rotor 17 inserted therethrough.

At the rear end of the direct motor 2, there is provided a rear housing 21 for accommodating the rear end of the rotary shaft 11. The rear housing 21 is formed with a flow path 22 that communicates with the through hole 11 a at the center of the rotary shaft 11. The flow path 22 is opened laterally of the rear housing 21, and a cooling fluid introduction port 23 is formed therein. A tube 24, through which a cooling fluid passes through the inside of the cooling fluid inlet 23, is maintained at a low temperature on the outside.
(Cooling fluid supply pipe) is connected.

Reference numeral 25 is a brush portion disposed in the circumferential direction of the direct motor 2 on the rear side in the housing 16 so as to come into contact with the rotary shaft 11. Voltage is applied and a direct current is supplied.

Further, reference numeral 26 is a grip portion provided on the punching device main body 1, and the punching device main body 1 can be supported by gripping the gripping portion 26 with a hand. A trigger-like switch 27 is provided at a portion of the grip portion 26 close to the punching device body 1 and at a portion where the index finger is located when the grip portion 26 is gripped by hand. In this switch 27, a voltage is applied to the brush section 25 by pulling the index finger, and the switch 27 returns to its original position by the elastic member incorporated inside when the index finger is released to cut off the voltage applied to the brush section 25. It is configured to be.

The switch 27 is connected to the direct motor 2
A conductor 28 (current supply line) through which a current supplied to the device flows is connected. The conductive wire 28 is in close contact with the tube 24 inside the grip portion 26 and is guided to the outside of the grip portion 26.

The tube 24 and the conducting wire 28 are provided between the main body 1 of the punching device and the supply unit 6 in a state where they are in close contact with each other and are covered with a cover that keeps the outside watertight. Inside the supply unit 6, the tubes 24 and the conductors 28 are separated again, one tube 24 to the cooling fluid supply device 5 and the other conductor 28.
Are connected to the motor power supply 4.

The motor power source 4 is provided with a battery (not shown) for supplying a current to the direct motor 2. This battery has a potential difference between electrodes of 24 V and is capable of supplying at least an instantaneous maximum current of 15 A. It is provided. In addition, the motor power source 4 includes an input cable 6 provided in the supply unit 6 from the wiring laid in the building.
It is configured to convert the alternating current input via a to a direct current to supply a current to the direct motor 2, and also to supply electric power from an automobile via the input cable 6b. Here, the motor power supply 4 is configured to charge the battery when no current is supplied from the battery.

Cooling fluid supply device 5 in this embodiment
Is configured to use air as a cooling fluid, and includes a compressor 5a that takes in air from the outside of the supply unit 6 and compresses it, and a cooling device 5b that cools the compressed air.

Next, the operation of the punching device having the above-described structure and the work of punching an object to be excavated made of a brittle material such as tiles or joints of tiles using the punching device will be described. First, the punching device main body 1 is gripped by the gripping portion 26, and is positioned at a predetermined drilling position of the object to be excavated so that the axis of the rotating shaft 11 matches. After the boring machine body 1 is positioned with respect to the object to be excavated, the switch 27 is pulled with the index finger to apply a DC voltage to the brush portion 25 of the direct motor 2 to energize the coil of the rotor 17 (or the stator 18). Rotate 17 at high speed. And the drilling tool 1
While rotating 3 at a high speed, the bit 15 of the drilling tool 13 connected to the tip of the rotary shaft 11 is pressed against the surface of the object to be excavated. As a result, a hole is formed in the object to be excavated by the bit 15 rotating at high speed. During the boring operation, air is supplied from the cooling fluid supply device 5 to the bit 15
The chips are discharged while cooling. Further, in the work at the construction site where the input cables 6a and 6b are insufficient, the work is continued by switching to the mode using the battery of the motor power source 4.

In the punching device having such a structure, the tube 24 is made of a material having good thermal conductivity, the outside of the tube 24 is kept at a low temperature, and the tube 24 and the conductive wire 2 are provided.
8 and 8 are provided adjacent to each other, the conductive wire 28 is cooled by air as a cooling fluid. As a result, an increase in the temperature of the conductive wire 28 is suppressed and an increase in the electrical resistance is also suppressed, so that the conductive wire 28 can be made thinner and its weight can be reduced.

Further, from the battery to the direct motor 2
The electric current is supplied to, and it is possible to work efficiently regardless of the wiring laid in the building. At the same time, electric power can be obtained from the wiring laid in the building, and the battery and the external electric power can be alternately used, which is highly convenient. Here, during the drilling work using the battery,
When the bit 15 comes into contact with a reinforcing bar or the like and the rotation of the drilling tool 3 suddenly stops, the direct motor 2 does not generate a counter electromotive force, so a high current momentarily flows from the battery to the direct motor 2, but the electrode of the battery There is no problem because the potential difference between the two is set to 24V and the instantaneous maximum current of 15A is supplied with sufficient capacity.

Further, the cooling fluid supply device 5 and the motor power source 4
Since the and can be handled as one supply unit 6, the convenience is high.

Further, since the drilling tool 3 is directly attached to the rotary shaft 11 of the rotor 17 without a gear or the like, there is no work loss in the rotation transmission system, and the output power of the direct motor 2 is directly the output power of the drilling device. Therefore, the drilling tool 3 can be rotated with high torque and at high speed. Then, the punching device main body 1 can be reduced in size and weight.

Further, during the punching work, the punching device main body 1 is gripped by the gripping portion 26, and the start and stop of the punching can be operated by the switch 27 at hand, which is excellent in workability.

As described above, according to this embodiment, the weight of the conductor wire 28 can be reduced, and the work can be performed efficiently regardless of the wiring laid in the building. In this way, it is possible to reduce the weight of the punching device and improve the handleability.

In the above embodiment, air is used as the cooling fluid, but water may be used as the cooling fluid. As a result, the cooling capacity is further improved, and the conductor wire can be made thinner.

[0048]

The present invention has the following effects. According to the invention described in claim 1, the cooling fluid supply device and the motor power source are provided separately from the punching device body provided with the punching tool and the motor, and the cooling fluid supply device and the cooling fluid supply device are provided. Since the cooling fluid supply pipe between them and the current supply line between the punching device main body and the motor power supply are provided so as to be adjacent to each other, the weight of the current supply line can be reduced and the drilling device is lightweight. And the handleability can be improved.

According to the second aspect of the present invention, the motor is a direct current motor, and the motor power source is provided with a battery for supplying a current to the motor. The battery has a potential difference between electrodes of 24V. In addition, since it is provided so as to be able to supply at least the instantaneous maximum current of 15 A, it is possible to work efficiently regardless of the wiring laid in the building.

According to the third aspect of the present invention, the motor power supply is configured to convert an alternating current input from the outside into a direct current and supply a current to the motor, which is convenient. Can be improved.

According to the invention described in claim 4, since the cooling fluid supply device and the motor power source are integrally provided, convenience can be improved.

Further, according to the invention of claim 5, in a drilling device provided with a motor for rotationally driving a drilling tool and a motor power supply for supplying a current to the motor, the motor comprises:
The motor is a direct current motor, and the motor power supply includes a battery that supplies a current to the motor. Since the battery has a potential difference between electrodes of 24 V and is capable of supplying at least an instantaneous maximum current of 15 A. , It is possible to work efficiently regardless of the wiring laid in the building.

Further, according to the invention described in claim 6, the motor has a cylindrical rotor integrally provided with a rotary shaft through which a drilling tool is attached at a tip end thereof, and an outer peripheral surface of the rotor. Since it is provided with the cylindrical stator provided in the above, it is possible to reduce the size and weight of the punching device.

According to the invention described in claim 7, since the gripping portion which can be gripped by hand and the switch for starting and stopping the motor are provided adjacent to the gripping portion, the workability is improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment according to the present invention,
It is a schematic block diagram of a punching device.

FIG. 2 is a diagram showing an embodiment according to the present invention,
It is a side view which partially cuts and shows the punching device main body of a punching device.

[Explanation of symbols]

1 ... Punching device body 2 Direct motor (motor) 3 ... Drilling tool 4 ... Motor power supply 5: Cooling fluid supply device 6 ... Supply unit 14 ... Tool body 15-bit 17 ... Rotor 18 ... Stator 24 ... Tube (cooling fluid supply pipe) 26 ... Grip 27 ... Switch 28 ... Conductor (current supply line)

Continued front page    (72) Inventor Shigeru Masaki             3-5-1, Otemachi, Chiyoda-ku, Tokyo             Ryo Materials Co., Ltd. (72) Inventor Toshio Imaoka             681 Saedo-cho, Tsuzuki-ku, Yokohama-shi, Kanagawa Japan             Inside Diamond Co., Ltd. (72) Inventor Sato Kyushu             Onda Bi, 5-3-13 Sotokanda, Chiyoda-ku, Tokyo             Le 201 F term (reference) 3C069 AA04 BA09 BB03 BB04 CA12                       EA01

Claims (7)

[Claims] 1. A drilling tool having at its tip a bit for drilling an object to be drilled, and a motor for rotationally driving the drilling tool,
A drilling device comprising a cooling fluid supply device for supplying a cooling fluid to the tip of the drilling tool, and a motor power supply for supplying current to the motor, wherein the drilling tool and the motor are provided in a drilling device body. Along with the cooling fluid supply device and the motor power source is provided separately from the punching device body, between the punching device body and the cooling fluid supply device,
A cooling fluid supply pipe is provided in which a cooling fluid passes through the inside and the outside is kept at a low temperature, and a current supply line through which an electric current flows is provided between the punching device main body and the motor power supply. The punching device, wherein the supply pipe and the current supply line are provided so as to be adjacent to each other. 2. The punching device according to claim 1, wherein the motor is a direct-current motor, the motor power source includes a battery that supplies a current to the motor, and the battery has a potential difference between electrodes of 24 V. In addition, the punching device is provided so as to be capable of supplying at least an instantaneous maximum current of 15 A. 3. The punching device according to claim 2, wherein the motor power supply is configured to convert an alternating current input from the outside into a direct current and supply a current to the motor. Punching device. 4. The punching device according to claim 1, wherein the cooling fluid supply device and the motor power source are integrally provided. 5. A drilling tool having at its tip a bit for drilling an object to be drilled, and a motor for driving the drilling tool to rotate.
A punching device comprising: a motor power supply for supplying a current to the motor, wherein the motor is a DC motor, the motor power supply includes a battery for supplying a current to the motor, and the battery is an inter-electrode. And a potential difference of 24 V, and at least an instantaneous maximum current of 15 A can be supplied. 6. The punching device according to claim 1, wherein the motor is a cylinder integrally provided with a rotary shaft through which a drilling tool is attached at a tip portion of the motor. And a cylindrical stator provided on the outer peripheral surface of the rotor. 7. The punching device according to claim 1, wherein the punching device main body includes a gripping portion that can be gripped by hand, and the motor that is adjacent to the gripping portion. A punching device comprising a switch for starting and stopping.