JP2020160559A - Machine tool and determination method - Google Patents

Abstract

To provide a machine tool and a determination method capable of determining whether or not the relocation detection unit has been removed.SOLUTION: A machine tool equipped with a relocation detection unit that detects the relocation of its own machine, includes: an energization detection mechanism 28 that detects whether an attached portion 17 to which the relocation detection unit is attached and the relocation detection unit is energized; and a CPU 21 that determines whether or not the relocation detection unit has been removed based on the detection result of the energization detection mechanism 28.SELECTED DRAWING: Figure 4

Description

The present invention relates to a machine tool and a determination method capable of determining the removal of a relocation detection unit that detects the relocation of its own machine.

Traditionally, means of monitoring the relocation of machine tools have become widespread. Patent Document 1 discloses a device relocation presence / absence detection device that detects the relocation of a machine tool using a gyro sensor.
In addition, there is also a technique for detecting the relocation of a machine tool by detecting a change in the distance from the installation surface (floor) of the machine tool using an optical sensor.

JP-A-2007-334395

However, when the device relocation presence / absence detection device of Patent Document 1 is removed from the machine tool to be monitored, the relocation of the machine tool to be monitored cannot be detected, and the machine tool to be monitored is illegal. There is a problem that it cannot be relocated. Such a problem is the same when the above-mentioned optical sensor is used.

The present invention has been made in view of such circumstances, and an object of the present invention is a machine tool capable of determining whether or not the relocation detection unit has been removed with a simple configuration and solving the above-mentioned problems at low cost. The purpose is to provide a machine and a determination method.

The machine tool according to the present invention is a machine tool provided with a relocation detection unit that detects the relocation of its own machine, and includes an energization detection mechanism that detects whether the attached portion to which the relocation detection unit is attached and the relocation detection unit are energized. It is characterized by including a determination unit for determining whether or not the relocation detection unit has been removed based on the detection result of the energization detection mechanism.

In the present invention, the energization detection mechanism detects whether or not the attached portion to which the relocation detection unit is attached and the relocation detection unit are energized with each other. For example, when the energization detection mechanism detects that the attached portion and the relocation detection unit are not energized with each other, the determination unit determines that the relocation detection unit has been removed.

In the machine tool according to the present invention, the energization detection mechanism has a first resistor in which one end is connected to a power source and the other end is electrically connected to the determination unit, and the other end of the first resistor and the attached portion are electrically connected. A first connection portion to be connected and a second connection portion that energizes the first connection portion and connects to the power supply via a fixed potential are provided, and the determination unit includes the first resistor and the first connection portion. It is characterized in that it is determined whether or not the relocation detection unit has been removed based on the first voltage between the connection units.

In the present invention, the power supply, the first resistor, the first connection portion, the attached portion and the second connection portion form a so-called pull-up circuit. Therefore, when the attached portion is removed from the first connection portion or the second connection portion, the first voltage between the first resistor and the first connection portion changes, and the determination unit determines the relocation detection unit based on this. Determine if it has been removed.

In the machine tool according to the present invention, the energization detection mechanism has a second resistor in which one end is connected to the power supply and the other end is connected to the determination unit, and the other end of the second resistor and the attached portion are electrically connected. A third connection portion to be connected is provided, the third connection portion energizes the first connection portion or the second connection portion, and the determination unit uses the first voltage, the second resistor, and the second connection portion. It is characterized in that it is determined whether or not the relocation detection unit has been removed based on the second voltage between the three connection units.

In the present invention, one end of the second resistor is connected to the power supply, the other end is connected to the determination portion, and the third connection portion electrically connects the other end of the second resistor and the attached portion. To do. Therefore, when the attached portion is removed from the third connecting portion, the second voltage between the second resistor and the third connecting portion changes. The determination unit determines whether or not the relocation detection unit has been removed based on the first voltage and the second voltage.

In the machine tool according to the present invention, the energization detection mechanism has a second resistor in which one end is connected to the power supply and the other end is connected to the determination unit, and the other end of the second resistor and the attached portion are electrically connected. A third connection portion to be connected and a fourth connection portion that energizes the third connection portion and connects to the power supply via a fixed potential are provided, and the determination unit includes the first voltage and the second connection portion. It is characterized in that it is determined whether or not the relocation detection unit has been removed based on the resistance and the second voltage between the third connection unit.

In the present invention, the power supply, the second resistor, the third connection portion, the attached portion and the fourth connection portion form a so-called pull-up circuit. Therefore, when the attached portion is removed from the third connection portion or the fourth connection portion, the second voltage between the second resistor and the third connection portion changes. The determination unit determines whether or not the relocation detection unit has been removed based on the first voltage and the second voltage.

The machine tool according to the present invention is characterized in that the determination unit determines that the relocation detection unit has been removed when at least one of the first voltage and the second voltage is equal to or greater than a threshold value.

In the present invention, when at least one of the first voltage and the second voltage is equal to or higher than the threshold value, that is, from at least one of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion. When the attached portion is removed, the determination unit determines that the relocation detection unit has been removed.

The machine tool according to the present invention is characterized in that the determination unit determines that the relocation detection unit has been removed when both the first voltage and the second voltage are equal to or higher than the threshold value.

In the present invention, when both the first voltage and the second voltage are equal to or higher than the threshold value, that is, the attached portion is attached from all of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion. When is removed, the determination unit determines that the relocation detection unit has been removed.

The machine tool according to the present invention is characterized in that at least one of the first connecting portion and the second connecting portion is a fixing member for fixing the relocation detecting portion to the attached portion.

In the present invention, at least one of the first connection portion and the second connection portion is, for example, a stud boss that fixes the relocation detection portion to the attached portion.

The machine tool according to the present invention is characterized in that at least one of the third connecting portion and the fourth connecting portion is a fixing member for fixing the relocation detecting portion to the attached portion.

In the present invention, at least one of the third connection portion and the fourth connection portion is, for example, a stud boss that fixes the relocation detection portion to the attached portion.

In the machine tool according to the present invention, the energization detection mechanism has a first resistor in which one end is connected to a power source and the other end is electrically connected to the determination unit, and the other end of the first resistor and the attached portion are electrically connected. The first connection portion to be connected, the second connection portion that energizes the first connection portion and is connected to the power supply via a fixed potential, the other end of the first resistor, and the attached portion are electrically connected. A third connection portion and a fourth connection portion that energizes the third connection portion and connects to the power supply via a fixed potential are provided, and the determination unit is the voltage of the other end of the first resistor. Based on the above, it is determined whether or not the relocation detection unit has been removed.

In the present invention, the power supply, the first resistor, the first connection portion, the attached portion and the second connection portion form a so-called pull-up circuit. Therefore, when the attached portion is removed from the first connection portion or the second connection portion, the voltage at the other end of the first resistor changes. Further, the power supply, the first resistor, the third connection portion, the attached portion and the fourth connection portion form another pull-up circuit. Therefore, even when the attached portion is removed from the third connection portion or the fourth connection portion, the voltage at the other end of the first resistor changes. Therefore, the determination unit determines whether or not the relocation detection unit has been removed based on the voltage at the other end of the first resistor.

In the machine tool according to the present invention, at least one of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion is a fixing member for fixing the relocation detection portion to the attachment portion. It is characterized by being.

In the present invention, at least one of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion is, for example, a stud boss that fixes the relocation detection portion to the attached portion.

The determination method according to the present invention is a determination method for determining the removal of the relocation detection unit by a machine tool provided with a relocation detection unit that detects the relocation of the own machine, the attached portion to which the relocation detection unit is attached and the said. It is characterized in that it detects whether or not the relocation detection unit is energized, and determines whether or not the relocation detection unit has been removed based on the result of the detection.

In the present invention, it is detected whether or not the attached portion to which the relocation detection unit is attached and the relocation detection unit are energized with each other, and for example, it is detected that the attached portion and the relocation detection unit are not energized. In this case, it is determined that the relocation detection unit has been removed.

According to the present invention, it is possible to determine whether or not the relocation detection unit has been removed with a simple configuration, and it is possible to solve the problem that the removal of the relocation detection unit makes it impossible to deal with the illegal relocation of the machine tool to be monitored.

It is a perspective view which shows the machine tool which concerns on Embodiment 1. It is a block diagram which shows the main part structure of the machine tool which concerns on Embodiment 1. It is explanatory drawing explaining the installation of the relocation detection device in the machine tool which concerns on Embodiment 1. FIG. It is a schematic circuit diagram which shows the energization detection mechanism of the machine tool which concerns on Embodiment 1. FIG. It is a schematic circuit diagram which shows the energization detection mechanism of the machine tool which concerns on Embodiment 2. FIG. It is a schematic circuit diagram which shows the energization detection mechanism of the machine tool which concerns on Embodiment 3. FIG. It is a schematic circuit diagram which shows the energization detection mechanism of the machine tool which concerns on Embodiment 4. FIG.

The machine tool according to the embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a perspective view illustrating the machine tool 100 according to the first embodiment, and FIG. 2 is a block diagram illustrating a main configuration of the machine tool 100 according to the first embodiment. The machine tool 100 includes a base 1, a machine body 2, a machine cover 3, an operation unit 4, and a control device 10.

The base 1 supports the machine body 2. The machine cover 3 covers the machine body 2. The control device 10 is attached to the rear side of the machine body 2. The operation unit 4 has a display unit 4a, switches, buttons, a touch panel, and the like, and accepts operations by the operator.

The machine body 2 includes a spindle drive mechanism 2a and a work holding portion drive mechanism 2b. The spindle drive mechanism 2a executes rotation of the spindle on which the tool is mounted and vertical / horizontal / forward / backward movement of the spindle. The work holding unit drive mechanism 2b executes rotation of the work holding unit that holds the work.

The control device 10 includes a CPU 11, a ROM 12, a RAM 13, a non-volatile memory 14, an input / output interface (hereinafter referred to as an input / output I / F) 16, and the like. The CPU 11 reads the control program stored in the ROM 12 into the RAM 13 to control the spindle drive mechanism 2a, the work holding unit drive mechanism 2b, and the like. The non-volatile memory 14 is, for example, EEPROM (registered trademark), EPROM, flash memory, or the like. A hard disk may be used instead of the non-volatile memory 14.

An operation signal is input from the operation unit 4 to the control device 10 via the input / output I / F 16. A drive / stop signal is output from the control device 10 to the spindle drive mechanism 2a, the work holding unit drive mechanism 2b, and the like via the input / output I / F16.

The machine tool 100 includes a power supply 5, a power switch 6, and a relocation detection device 20. The power switch 6 switches the power supply 5 on / off.

The relocation detection device 20 detects whether the machine tool 100 has been improperly relocated or remodeled. For example, when vibration equal to or higher than the threshold value is detected when the power of the machine tool 100 is turned off, the relocation detection device 20 transmits a signal (excess signal) indicating that the vibration value exceeds the threshold value to the control device 10.

The relocation detection device 20 includes a battery 27, a CPU 21 (determination unit), a ROM 22, a RAM 23, a non-volatile memory 24, an energization detection mechanism 28, a vibration sensor 25, an input / output interface (hereinafter referred to as an input / output I / F) 26, and the like. Has. The CPU 21 reads the control program stored in the ROM 22 into the RAM 23, and executes a process of detecting the relocation or modification of the machine tool 100.

The non-volatile memory 24 stores a threshold value for comparing the vibration values detected by the vibration sensor 25. The non-volatile memory 24 is, for example, EEPROM (registered trademark), EPROM, flash memory, or the like. A hard disk may be used instead of the non-volatile memory 24.

The power switch 6 inputs a signal indicating on or off of the power supply 5 to the relocation detection device 20 via the input / output I / Fs 16 and 26. The vibration sensor 25 detects the magnitude of vibration of the machine tool 100. As the vibration sensor 25, for example, an acceleration sensor or a gyro sensor is used. When the vibration value detected by the vibration sensor 25 exceeds a preset threshold value, the CPU 21 outputs an excess signal to the control device 10. Since the relocation detection device 20 has a battery 27, the above process can be executed even when the power supply 5 is off.

The energization detection mechanism 28 detects whether the attached portion to which the relocation detection device 20 is attached and the relocation detection device 20 are energized. In the following, for convenience of explanation, a case where the relocation detection device 20 is provided in the control device 10 will be described as an example. That is, the energization detection mechanism 28 detects whether the relocation detection device 20 and the sheet metal 17 (attached portion) described later of the control device 10 are in the energization state. The energization detection mechanism 28 outputs the detection result to the CPU 21. Details of the energization detection mechanism 28 will be described later.

When the control device 10 and the relocation detection device 20 determine that the machine tool 100 has been improperly relocated or remodeled, the relocation detection device 20 limits the subsequent operation of the machine tool 100. For example, when the power of the machine tool 100 is turned off, the vibration sensor 25 detects the vibration, and if the detected vibration is equal to or greater than the threshold value, the relocation detection device 20 transmits an excess signal to the control device 10. Upon receiving the excess signal, the control device 10 (CPU 11) outputs an instruction signal for displaying a warning to the display unit 4a, and prohibits the operation of the machine body 2. For example, the CPU 11 subsequently ignores the drive signal for driving the spindle drive mechanism 2a or the work holding unit drive mechanism 2b received from the operation unit 4.

On the other hand, the control device 10 limits the operation of the machine tool 100 according to the excess signal output by the relocation detection device 20. If the relocation detection device 20 does not output an excess signal, in other words, if the relocation detection device 20 is removed from the machine tool 100 with an illegal intention, the control device 10 may be illegally relocated or modified. The operation of the machine tool 100 cannot be restricted by. The machine tool 100 according to the first embodiment can deal with such a problem.

FIG. 3 is an explanatory diagram illustrating the attachment of the relocation detection device 20 in the machine tool 100 according to the first embodiment.
In the machine tool 100 according to the first embodiment, the transfer detection device 20 is fixed to the sheet metal 17 of the control device 10 by using the conductive stud boss 171 and the screw 172. Through holes that penetrate the substrate 29 in the thickness direction are formed at the four corners of the substrate 29 that constitutes the relocation detection device 20, and screws 172 (fixing members) are inserted into the through holes and screwed to the stud boss 171. As a result, the relocation detection device 20 (board 29) is attached to the sheet metal 17. There are four stud bosses 171, stud boss 171A and stud boss 171D (fixing member), all of which are interposed between the substrate 29 and the sheet metal 17. The substrate 29 is rectangular and insulating, and has stud boss 171A (first connection) and stud boss 171B (second connection), stud boss 171C (third connection), and stud boss 171D (not shown). The fourth connection portion) can be energized via the sheet metal 17.

The energization detection mechanism 28 is configured on the substrate 29 of the relocation detection device 20, and the energization detection mechanism 28 constitutes a circuit for detecting the removal of the relocation detection device 20 by using the sheet metal 17. FIG. 4 is a schematic circuit diagram showing an energization detection mechanism 28 of the machine tool 100 according to the first embodiment.

The energization detection mechanism 28 has a power supply 281 including, for example, a 5V battery. The configuration is not limited to this, and the battery 27 of the relocation detection device 20 may also be used.
One end of a resistor 282 (first resistor) is electrically connected to one end of the power supply 281, and a conductor 283 (fixed potential) as a GND is electrically connected to the other end of the power supply 281. The resistor 282 is, for example, 10-50 kΩ.

The other end of the resistor 282 is branched into two at the connection node D1. Of the above two, one is electrically connected to the first input terminal 211 of the CPU 21, and the other is electrically connected to the stud boss 171A. The CPU 21 is electrically connected to the conductor 283. The present invention is not limited to this, and a GPU, a microcontroller, or the like may be used instead of the CPU 21.

The stud boss 171A is energized with the stud boss 171B, and the stud boss 171B is electrically connected to the conductor 283. That is, the stud boss 171B is electrically connected to the power supply 281 via the conductor 283. The energization detection mechanism 28 constitutes a so-called pull-up circuit.

Therefore, when the stud boss 171A and the stud boss 171B are electrically connected to the connection node D1, that is, when the relocation detection device 20 is fixed to the sheet metal 17, the current from the power supply 281 is the resistance 282, the connection node. D1, stud boss 171A, sheet metal 17, stud boss 171B and conductor 283 flow in this order. At this time, the voltage between the resistor 282 and the stud boss 171A, that is, the first voltage input to the first input terminal 211 of the CPU 21 is "0 (zero) V".

On the other hand, when the stud boss 171A or the stud boss 171B is not electrically connected to the connection node D1, that is, when the relocation detection device 20 is removed from the sheet metal 17 (stud boss 171A), the current from the power supply 281 is the connection node. The current does not flow from D1 to the stud boss 171A side, and at this time, the voltage between the resistor 282 and the stud boss 171A, that is, the first voltage input to the first input terminal 211 of the CPU 21 becomes "5V".

Therefore, the CPU 21 monitors the first voltage input to the first input terminal 211, and if the first voltage is larger than the threshold value (for example, 1V), it can be determined that the relocation detection device 20 has been removed from the sheet metal 17. When the CPU 21 determines that the relocation detection device 20 has been removed from the sheet metal 17, the CPU 21 sends an excess signal to the control device 10. Upon receiving the excess signal, the control device 10 outputs an instruction signal for displaying a warning to the display unit 4a and prohibits the operation of the machine body 2.

In the above, the case where the energization detection mechanism 28 is electrically connected to the stud boss 171A and the stud boss 171B has been described as an example, but the present invention is not limited to this. The energization detection mechanism 28 may be configured to be electrically connected to the stud boss 171C and the stud boss 171D.

As described above, the machine tool 100 according to the first embodiment can quickly detect when the relocation detection device 20 is removed from the sheet metal 17, and can quickly respond to the illegal removal of the relocation detection device 20. Further, the machine tool 100 according to the first embodiment can detect the unauthorized removal of the relocation detection device 20 at low cost with a simple structure.

(Embodiment 2)
FIG. 5 is a schematic circuit diagram showing the energization detection mechanism 28A of the machine tool 100 according to the second embodiment.

The energization detection mechanism 28A has a power supply 281 including, for example, a 5V battery. The configuration is not limited to this, and the battery 27 of the relocation detection device 20 may also be used.
One end of the power supply 281 is branched into two at the connection node D2. Of the two, one end of the resistor 282 is electrically connected to the other, and one end of the resistor 284 (second resistor) is electrically connected to the other. A conductor 283 is electrically connected to the other end of the power supply 281, and the resistor 282 and the resistor 284 are, for example, 10-50 kΩ.

The other end of the resistor 282 is branched into two by the connection node D1, one is electrically connected to the first input terminal 211 of the CPU 21, and the other is electrically connected to the stud boss 171A. The CPU 21 is electrically connected to the conductor 283. The present invention is not limited to this, and a GPU, a microcomputer, or the like may be used instead of the CPU 21.

The stud boss 171A is energized via the stud boss 171B and the sheet metal 17, and the stud boss 171B is electrically connected to the conductor 283. However, the sheet metal 17 is divided into two, a side having the stud boss 171A and the stud boss 171B, and a side having the stud boss 171C and the stud boss 171D.

The other end of the resistor 284 is branched into two by the connection node D3, one is electrically connected to the second input terminal 212 of the CPU 21, and the other is electrically connected to the stud boss 171C. The stud boss 171C is energized via the stud boss 171D and the sheet metal 17, and the stud boss 171D is electrically connected to the conductor 283. That is, the stud boss 171D is electrically connected to the power supply 281 via the conductor 283.

Therefore, when the stud boss 171A and the stud boss 171B are electrically connected to the connection node D1, the current from the power supply 281 is the connection node D2, the resistor 282, the connection node D1, the stud boss 171A, the sheet metal 17, the stud boss 171B, and the stud boss 171B. It flows in the order of the conductor 283. At this time, the voltage between the resistor 282 and the stud boss 171A, that is, the first voltage input to the first input terminal 211 of the CPU 21 is "0 (zero) V".

When the stud boss 171C and the stud boss 171D are electrically connected to the connection node D3, the current from the power supply 281 is the connection node D2, the resistor 284, the connection node D3, the stud boss 171C, the sheet metal 17, the stud boss 171D, and the stud boss 171D. It flows in the order of the conductor 283. At this time, the voltage between the resistor 284 and the stud boss 171C, that is, the second voltage input to the second input terminal 212 of the CPU 21 is “0 (zero) V”.

That is, when the relocation detection device 20 is correctly fixed to the sheet metal 17, the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212 are both "0V". ..

On the other hand, when the stud boss 171A or the stud boss 171B is not electrically connected to the connection node D1, the current from the power supply 281 does not flow from the connection node D1 to the stud boss 171A side, and at this time, the resistor 282 and the stud boss 171A The voltage between them, that is, the first voltage input to the first input terminal 211 of the CPU 21 becomes "5V".

When the stud boss 171C or the stud boss 171D is not connected to the connection node D3, the current from the power supply 281 does not flow from the connection node D3 to the stud boss 171C side, and at this time, the voltage between the resistor 284 and the stud boss 171C. That is, the second voltage input to the second input terminal 212 of the CPU 21 is "5V".

When the relocation detection device 20 is to be removed from the sheet metal 17, that is, when the relocation detection device 20 is removed from any one of the stud boss 171A and the stud boss 171D, the first input to the first input terminal 211 is made. The voltage or the second voltage input to the second input terminal 212 becomes "5V".
When the relocation detection device 20 is removed from the sheet metal 17, that is, the relocation detection device 20 is removed from any one of the stud boss 171A and the stud boss 171B, and the relocation detection device 20 is removed from any one of the stud boss 171C and the stud boss 171D. When the relocation detection device 20 is removed, the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212 become "5V".

Therefore, the CPU 21 monitors the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212, and is trying to remove the relocation detection device 20 from the sheet metal 17, or the relocation detection device. It is possible to detect whether the 20 is removed from the sheet metal 17.
When either the first voltage or the second voltage is larger than the threshold value (for example, 1V), the CPU 21 can determine that the relocation detection device 20 is about to be removed from the sheet metal 17. When both the first voltage and the second voltage are larger than the threshold value, the CPU 21 can determine that the relocation detection device 20 has been removed from the sheet metal 17.

When at least one of the first voltage and the second voltage is larger than the threshold value, that is, when the relocation detection device 20 is removed from at least one of the stud boss 171A-stud boss 171D, the CPU 21 removes the relocation detection device 20 from the sheet metal 17. You may judge that it was.

As described above, when it is determined that the relocation detection device 20 has been removed from the sheet metal 17, the CPU 21 sends an excess signal to the control device 10. Upon receiving the excess signal, the control device 10 outputs an instruction signal for displaying a warning to the display unit 4a and prohibits the operation of the machine body 2. Therefore, it is possible to prevent the relocation detection device 20 from being removed.

Since it can be assumed that any one of the stud boss 171A and the stud boss 171D is removed for some reason, the CPU 21 sends an excess signal to the control device 10 only when both the first voltage and the second voltage are larger than the threshold value. You may try to do it.

The machine tool 100 according to the second embodiment is not limited to this. If either the first voltage or the second voltage is greater than the threshold value, the CPU 21 sends the first excess signal to the control device 10, and the control device 10 that receives the first excess signal displays a warning. The instruction signal to be output is output to the display unit 4a. At this time, the operation of the machine body 2 is not prohibited.
After that, when both the first voltage and the second voltage are larger than the threshold value, the CPU 21 sends a second excess signal to the control device 10, and the control device 10 that receives the second excess signal is the machine body 2. It may be configured to prohibit driving.

As described above, the machine tool 100 according to the second embodiment can quickly detect when the relocation detection device 20 is to be removed from the sheet metal 17 and when the relocation detection device 20 is removed from the sheet metal 17, and is illegal. It is possible to quickly respond to the removal of the relocation detection device 20. Further, the machine tool 100 according to the second embodiment can detect the unauthorized removal of the relocation detection device 20 at low cost with a simple structure.

The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 3)
FIG. 6 is a schematic circuit diagram showing the energization detection mechanism 28B of the machine tool 100 according to the third embodiment.

The energization detection mechanism 28B has a power supply 281 including, for example, a 5V battery. The configuration is not limited to this, and the battery 27 of the relocation detection device 20 may also be used.
One end of the resistor 282 is electrically connected to one end of the power supply 281 and the conductor 283 is electrically connected to the other end of the power supply 281. The resistor 282 is, for example, 10-50 kΩ.

The other end of the resistor 282 is branched into three by the connection node D1, the first of the three is electrically connected to the first input terminal 211 of the CPU 21, and the second is to the stud boss 171A. It is electrically connected, and the third is electrically connected to the stud boss 171C. The CPU 21 is electrically connected to the conductor 283.

The stud boss 171A is energized via the stud boss 171B and the sheet metal 17, and the stud boss 171B is electrically connected to the conductor 283. The stud boss 171C is energized via the stud boss 171D and the sheet metal 17, and the stud boss 171D is electrically connected to the conductor 283. However, the sheet metal 17 is divided into two, a side having the stud boss 171A and the stud boss 171B, and a side having the stud boss 171C and the stud boss 171D.

Therefore, when the stud boss 171A and the stud boss 171B are electrically connected to the connection node D1, the current from the power supply 281 is the resistance 282, the connection node D1, the stud boss 171A, the sheet metal 17, the stud boss 171B and the conductor 283. It flows in order. When the stud boss 171C and the stud boss 171D are electrically connected to the connection node D1, the current from the power supply 281 is the resistance 282, the connection node D1, the stud boss 171C, the sheet metal 17, the stud boss 171D, and the conductor 283. It flows in order.
At this time, the voltage at the connection node D1, that is, the first voltage input to the first input terminal 211 of the CPU 21 is "0 (zero) V".

In the machine tool 100 according to the third embodiment, the stud boss 171A or the stud boss 171B is not electrically connected to the connection node D1, and the stud boss 171C and the stud boss 171D are connected to the connection node D3. In this case, the first voltage input to the first input terminal 211 of the CPU 21 is "0 (zero) V".
Further, even when the stud boss 171C or the stud boss 171D is not electrically connected to the connection node D1 and the stud boss 171A and the stud boss 171B are connected to the connection node D3, the first input terminal 211 of the CPU 21 The first voltage input to is "0 (zero) V".

On the other hand, when the relocation detection device 20 is removed from the sheet metal 17, that is, the relocation detection device 20 is removed from any one of the stud boss 171A and the stud boss 171B, and any one of the stud boss 171C and the stud boss 171D is removed. When the relocation detection device 20 is removed from the above, the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212 become "5V".

Therefore, the CPU 21 can monitor the first voltage input to the first input terminal 211 and detect whether the relocation detection device 20 has been removed from the sheet metal 17. When the first voltage is larger than the threshold value (for example, 1V), the CPU 21 can determine that the relocation detection device 20 has been removed from the sheet metal 17.

When the first voltage is larger than the threshold value, the CPU 21 sends an excess signal to the control device 10. Upon receiving the excess signal, the control device 10 outputs an instruction signal for displaying a warning to the display unit 4a and prohibits the operation of the machine body 2.

As described above, the machine tool 100 according to the third embodiment can quickly detect when the relocation detection device 20 is removed from the sheet metal 17, and can quickly respond to the illegal removal of the relocation detection device 20. Further, the machine tool 100 according to the third embodiment constitutes the energization detection mechanism 28B by using one resistor 282, the number of parts can be reduced, and the relocation detection device 20 is illegal at a lower cost. The removal can be detected.

The same parts as those of the first or second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above, the case where the relocation detection device 20 is attached to the sheet metal 17 by using the stud boss 171A-stud boss 171D has been described as an example, but the present invention is not limited to this. Using at least one of the stud boss 171A-stud boss 171D, the relocation detection device 20 is attached to the sheet metal 17 at at least one place, and the relocation detection device 20 and the sheet metal 17 are electrically connected to the sheet metal 17 at the other places by a copper wire or an electric wire. It may be configured.

(Embodiment 4)
FIG. 7 is a schematic circuit diagram showing the energization detection mechanism 28C of the machine tool 100 according to the fourth embodiment.

The energization detection mechanism 28C has a power supply 281 including, for example, a 5V battery. The configuration is not limited to this, and the battery 27 of the relocation detection device 20 may also be used.
One end of the power supply 281 is branched into two at the connection node D2. Of the two, one end of the resistor 282 is electrically connected to the other, and one end of the resistor 284 is electrically connected to the other. A conductor 283 is electrically connected to the other end of the power supply 281, and the resistor 282 and the resistor 284 are, for example, 10-50 kΩ.

The other end of the resistor 282 is branched into two by the connection node D1, one is electrically connected to the first input terminal 211 of the CPU 21, and the other is electrically connected to the stud boss 171A. The CPU 21 is electrically connected to the conductor 283. The present invention is not limited to this, and a GPU, a microcomputer, or the like may be used instead of the CPU 21.

The stud boss 171A is energized via the stud boss 171B and the sheet metal 17, and the stud boss 171B is electrically connected to the conductor 283.

The other end of the resistor 284 is branched into two by the connection node D3, one is electrically connected to the second input terminal 212 of the CPU 21, and the other is electrically connected to the stud boss 171C. The stud boss 171C is energized with the stud boss 171A and the stud boss 171B via the sheet metal 17.

Therefore, when the stud boss 171A and the stud boss 171B are electrically connected to the connection node D1, the current from the power supply 281 is the connection node D2, the resistor 282, the connection node D1, the stud boss 171A, the sheet metal 17, the stud boss 171B, and the stud boss 171B. It flows in the order of the conductor 283. At this time, the voltage between the resistor 282 and the stud boss 171A, that is, the first voltage input to the first input terminal 211 of the CPU 21 is "0 (zero) V".

When the stud boss 171C and the stud boss 171B are electrically connected to the connection node D3, the current from the power supply 281 is the connection node D2, the resistor 284, the connection node D3, the stud boss 171C, the sheet metal 17, the stud boss 171B, and the stud boss 171B. It flows in the order of the conductor 283. At this time, the voltage between the resistor 284 and the stud boss 171C, that is, the second voltage input to the second input terminal 212 of the CPU 21 is "0V".

That is, when the relocation detection device 20 is correctly fixed to the sheet metal 17, the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212 are both "0V". ..

On the other hand, when the stud boss 171A is not electrically connected to the connection node D1, the current from the power supply 281 does not flow from the connection node D1 to the stud boss 171A side, and at this time, the voltage between the resistor 282 and the stud boss 171A, That is, the first voltage input to the first input terminal 211 of the CPU 21 is "5V".

When the stud boss 171C is not connected to the connection node D3, the current from the power supply 281 does not flow from the connection node D3 to the stud boss 171C side, and at this time, the voltage between the resistor 284 and the stud boss 171C, that is, the CPU 21 The second voltage input to the second input terminal 212 of is "5V".

When the relocation detection device 20 is removed from the stud boss 171B, the current from the power supply 281 does not flow from the connection node D1 to the stud boss 171A side, and does not flow from the connection node D3 to the stud boss 171C side. Therefore, at this time, the first voltage input to the first input terminal 211 of the CPU 21 becomes "5V", and the second voltage input to the second input terminal 212 of the CPU 21 also becomes "5V".

That is, when the relocation detection device 20 is removed from the stud boss 171A or the stud boss 171C, the first voltage input to the first input terminal 211 or the second voltage input to the second input terminal 212 becomes "5V". ..
Further, when the relocation detection device 20 is removed from the stud boss 171B and from all of the stud boss 171A-stud boss 171C, the first voltage and the second input terminal 212 input to the first input terminal 211 The input second voltage becomes "5V".

Therefore, the CPU 21 monitors the first voltage input to the first input terminal 211 and the second voltage input to the second input terminal 212, and is trying to remove the relocation detection device 20 from the sheet metal 17, or the relocation detection device. It is possible to detect whether the 20 is removed from the sheet metal 17.
When at least one of the first voltage and the second voltage is larger than the threshold value, the CPU 21 can determine that the relocation detection device 20 has been removed from the sheet metal 17.

As described above, when it is determined that the relocation detection device 20 has been removed from the sheet metal 17, the CPU 21 sends an excess signal to the control device 10. Upon receiving the excess signal, the control device 10 outputs an instruction signal for displaying a warning to the display unit 4a and prohibits the operation of the machine body 2.

The same parts as those in the first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above, the case where the relocation detection device 20 is attached to the sheet metal 17 by using the stud boss 171 has been described as an example, but the present invention is not limited to this, and soldering may be used.
Further, in the above description, the case where the stud boss 171 is conductive has been described as an example, but the present invention is not limited to this. The relocation detection device 20 and the sheet metal 17 may be electrically connected separately by a copper wire or an electric wire using an insulating stud boss 171. In this case, the relocation detection device 20 (CPU 21) may monitor the energization of the copper wire or the electric wire.
Further, in the above description, the case where the relocation detection device 20 is attached to the sheet metal 17 by using the stud boss 171A-stud boss 171D has been described as an example, but the present invention is not limited to this. Using at least one of the stud boss 171A-stud boss 171D, the relocation detection device 20 is attached to the sheet metal 17 at at least one place, and the relocation detection device 20 and the sheet metal 17 are electrically connected to the sheet metal 17 at the other places by a copper wire or an electric wire. It may be configured.
In FIG. 6, one sheet metal 17 may be used without being divided, and the stud boss 171C may be electrically connected to the conductor 283. In this case, when the relocation detection device 20 is removed from the stud boss 171A, or when the relocation detection device 20 is removed from at least the stud boss 171B, the stud boss 171C, and the stud boss 171D, the input is input to the first input terminal 211 of the CPU 21. The first voltage becomes "5V".

17 Sheet metal 20 Relocation detection device 21 CPU
28 Energization detection mechanism 100 Machine tool 171 Stud boss 282 Resistance 284 Resistance

Claims (11)

In a machine tool equipped with a relocation detection unit that detects the relocation of its own machine
An energization detection mechanism that detects whether the attached portion to which the relocation detection unit is attached and the relocation detection unit is energized,
A machine tool including a determination unit that determines whether or not the relocation detection unit has been removed based on the detection result of the energization detection mechanism. The energization detection mechanism
A first resistor with one end connected to the power supply and the other end electrically connected to the determination unit,
The other end of the first resistor and the first connecting portion that electrically connects the attached portion,
It is provided with a second connection portion that energizes the first connection portion and connects to the power supply via a fixed potential.
The machine tool according to claim 1, wherein the determination unit determines whether or not the relocation detection unit has been removed based on the first voltage between the first resistor and the first connection unit. .. The energization detection mechanism
A second resistor with one end connected to the power supply and the other end connected to the determination unit,
It is provided with the other end of the second resistor and a third connecting portion for electrically connecting the attached portion.
The third connection portion is energized with the first connection portion or the second connection portion.
The claim is characterized in that the determination unit determines whether or not the relocation detection unit has been removed based on the first voltage and the second voltage between the second resistor and the third connection unit. The machine tool according to 2. The energization detection mechanism
A second resistor with one end connected to the power supply and the other end connected to the determination unit,
A third connecting portion that electrically connects the other end of the second resistor and the attached portion, and
It is provided with a fourth connection portion that energizes the third connection portion and connects to the power supply via a fixed potential.
The claim is characterized in that the determination unit determines whether or not the relocation detection unit has been removed based on the first voltage and the second voltage between the second resistor and the third connection unit. The machine tool according to 2. The machine tool according to claim 3 or 4, wherein the determination unit determines that the relocation detection unit has been removed when at least one of the first voltage and the second voltage is equal to or higher than a threshold value. The machine tool according to claim 3 or 4, wherein the determination unit determines that the relocation detection unit has been removed when both the first voltage and the second voltage are equal to or higher than a threshold value. The machine tool according to claim 2, wherein at least one of the first connecting portion and the second connecting portion is a fixing member for fixing the relocation detecting portion to the attached portion. The machine tool according to claim 4, wherein at least one of the third connecting portion and the fourth connecting portion is a fixing member for fixing the relocation detecting portion to the attached portion. The energization detection mechanism
A first resistor with one end connected to the power supply and the other end electrically connected to the determination unit,
The other end of the first resistor and the first connecting portion that electrically connects the attached portion,
A second connection portion that energizes the first connection portion and connects to the power supply via a fixed potential, and
A third connecting portion that electrically connects the other end of the first resistor and the attached portion, and
It is provided with a fourth connection portion that energizes the third connection portion and connects to the power supply via a fixed potential.
The machine tool according to claim 1, wherein the determination unit determines whether or not the relocation detection unit has been removed based on the voltage at the other end of the first resistor. A claim characterized in that at least one of the first connection portion, the second connection portion, the third connection portion, and the fourth connection portion is a fixing member for fixing the relocation detection portion to the attachment portion. Item 9. The machine tool according to item 9. In a machine tool equipped with a relocation detection unit that detects the relocation of its own machine, in a determination method for determining the removal of the relocation detection unit,
Detects whether the attached portion to which the relocation detection unit is attached and the relocation detection unit are energized,
A determination method characterized in that it is determined whether or not the relocation detection unit has been removed based on the result of the detection.

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