JP4883287B2 - Transfer restriction device and its illegal transfer prevention method - Google Patents

Description

  The present invention relates to a transfer restriction device in which free transfer is restricted and an unauthorized transfer prevention method thereof.

Conventionally, this type of transfer restriction device includes, for example, an ultra-precision processing machine that is prohibited by law from being exported to a certain foreign country, or a machine that is prohibited from resale by contract. With this transfer restriction device, the current position is detected by the GPS device when an external power supply is turned on at the moved location, and the transfer restriction device is operated when the move location is out of the preset allowable operating range. (For example, refer to Patent Document 1).
Japanese Patent Laying-Open No. 2005-44162 ([0032], FIG. 3)

  By the way, the above-described conventional transfer restriction device may be installed indoors where radio waves from satellites are difficult to reach. In particular, ultra-precision processing machines whose export is prohibited are usually installed in rooms with particularly poor radio wave environments such as clean rooms and temperature-controlled rooms. In such a case, since it is difficult to detect the installation location of the transfer restriction device by the GPS device, it is difficult to reliably prevent damage due to unauthorized transfer.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a transfer restriction device capable of reliably preventing damage due to unauthorized transfer and an unauthorized transfer prevention method thereof.

The transfer restriction device (10) according to the invention of claim 1 made to achieve the above object includes a position detection means (20) capable of detecting a position by receiving a signal from the outside, and a position detection means (20). A position storage means (22) capable of storing the position detected by the position detection means, a position data storage controller (16) for storing the position detected by the position detection means (20) in the position storage means (22), and a position storage means ( And 22) position discriminating means (S11) for discriminating whether or not the latest position stored in the operation allowable range is preset, and the operation cannot be performed when the latest position is out of the allowable operation range. In the transfer restriction device (10), the power receiving unit (12J) that receives power for operating the transfer restriction device (10) from the outside, and whether the power reception unit (12J) receives power from the outside is detected. Power reception detection In order to supply power to the position detection means (20) and the position data storage control section (16) and operate them during the stage (S1) and the period when the power supply from the outside to the power receiving section (12J) is stopped The position data storage control unit (16) includes a position detected by the position detection unit (20) during a period in which power supply from the outside to the power receiving unit (12J) is stopped. It is characterized in that it is stored in the position storage means (22) as a history .

According to a second aspect of the invention, the transfer restriction device (10) according to claim 1, during a period in which power supply to the power receiving portion from the outside (12 J) is stopped, the position detecting means (20) is intermittently It is characterized in that it is configured to operate.

According to a third aspect of the present invention, in the transfer restriction device (10) according to the first or second aspect , the position detecting means (20) is a GPS module (20) that performs position detection based on a radio signal from a satellite. However, it has characteristics.

According to a fourth aspect of the present invention, in the transfer restriction device (10) according to the first or second aspect , whether or not the position detecting means (20) has received a radio wave that can be received in a predetermined reception area as an allowable operation range. It is characterized in that it is configured to detect this.

According to a fifth aspect of the present invention, in the transfer restriction device (10) according to the first or second aspect , the position detecting means (20) is configured to receive radio waves and / or television waves that can be received in Japan as an allowable operating range. It is characterized in that it is configured to detect whether or not radio wave radio waves and / or PHS radio waves are received.

The invention according to claim 6 is the transfer restriction device (10) according to any one of claims 1 to 5 , wherein the operation unit (14) for operating the transfer restriction device (10) and the operation unit (14) are provided. A numerical operation unit (15) that performs numerical operation in accordance with an operation and a drive unit (19) that is driven based on the calculation result of the numerical operation unit (15) are provided, and at least one of the operation unit (14). It is characterized in that the transfer restriction device (10) becomes inoperable by disabling the part.

The method for preventing unauthorized transfer of the transfer restriction device (10) according to the invention of claim 7 is a position detection means for detecting a position by receiving a signal from the outside in the transfer restriction device (10) restricted in free transfer. 20), a position storage means (22) for storing the position detected by the position detection means (20) , and a power supply to the position detection means (22) during a period when the external power supply is stopped. The internal power supply (23) for operating the power supply is fixed , and the position detected by the position detection means (20) during the period when the external power supply is stopped is used as a history, and the position storage means (22). When the latest position stored in the position storage means (22) is out of the preset allowable operation range, the transfer restriction device (10) is disabled.

[Inventions of Claims 1 and 7 ]
According to the transfer restriction device and the unauthorized transfer prevention method thereof according to the inventions of claims 1 and 7 , even if the transfer restriction device is installed in a place where radio waves are difficult to reach such as indoors, it enters such a place. Based on the latest position previously detected by the position detection means and stored in the position storage means, it is determined whether the transfer restriction device is out of the allowable operation range, and the latest allowable position is set in advance. If it is out of the range, the transfer restriction device becomes inoperable. As a result, it is possible to reliably prevent damage caused by unauthorized transfer, and to reduce the illegal transfer act itself.

Further, during a period in which power supply from the outside to the power receiving portion is stopped, the position detecting hand stage is operated by power from the internal power source. That is, the position of the transfer restriction device is continuously detected during the period when the transfer restriction device is being transferred, and the detected position is stored in the position storage means.

Then, since the position detected by the position detection means during the period when the external power supply is stopped is stored in the position storage means as a history, the movement locus (transport route) to the transfer destination of the transfer restriction device is known. be able to.

[Invention of claim 2 ]
According to the invention of claim 2 , the power consumption of the internal power supply can be suppressed.

[Invention of claim 3 ]
In the transfer restriction device according to the third aspect , since the position detection of the transfer restriction device is performed by the GPS module, relatively detailed position detection based on the latitude and longitude can be performed.

[Invention of claim 4 ]
In the transfer restriction device according to claim 4 , since it is determined whether or not the position detection means is out of the allowable operating range based on whether or not the radio wave that can be received in the predetermined reception area is received, the cost is lower than that of the GPS module. The position can be detected with.

[Invention of claim 5 ]
In the transfer restriction device according to claim 5 , it is possible to determine whether or not the vehicle is out of Japan at a lower cost than the GPS module, and the transfer restriction device can be made inoperable when exported outside of Japan. . As a result, it is possible to reduce unauthorized export acts of transfer restricted devices.

[Invention of claim 6 ]
In the transfer restriction device according to the sixth aspect , since at least a part of the operation unit is made inoperable, it is possible to inform the person who has made an unauthorized operation that the operation is impossible.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows an ultraprecision machine 10 as a “transfer restriction device” of the present invention. The ultraprecision processing machine 10 includes a processing machine main body 11 with a controller 12 connected by a cable.

  The processing machine main body 11 is provided with a workpiece holding jig and a processing tool (not shown) inside, and the workpiece holding jig or the processing tool is driven by a drive unit 19 (see FIG. 2) such as a servo motor, for example. It can be driven. The workpiece holding jig or machining tool is driven based on the command value received from the controller 12, and the workpiece set on the workpiece holding jig is subjected to ultra-precision machining.

  As shown in FIG. 1, a monitor 14A, operation keys 14B, and various switches and knobs 14C are provided on the outer surface of the controller 12. Then, for example, an operation key 14B is used to set a workpiece machining shape. Further, in the controller 12, an operation signal for generating and outputting an electric signal corresponding to the operation of the display control circuit and the operation keys 14B and various switches and knobs 14C for displaying characters / images on the monitor 14A. 2 including the monitor 14A, operation keys 14B, various switches and knobs 14C, a display control circuit, an operation signal output circuit, and the like. 14 ”). In the present embodiment, the HMI unit 14 corresponds to an “operation unit” according to the present invention.

  Reference numeral 15 in FIG. 2 of the controller 12 is a numerical operation unit, which executes a workpiece machining program read from the memory 18 and responds to an output signal from the HMI unit 14 with a servo provided in the machine body 11. A control signal is output to the drive unit 19 such as a motor. As a result, the workpiece is machined into the shape set by the HMI unit 14. The controller 12 normally operates by receiving power from an external power source 40 provided in the factory. When the power supply from the external power source 40 is stopped, the controller 12 corresponds to the battery 23 (the “internal power source” of the present invention). ) To receive power from the machine.

  The GPS module 20 is fixed to the outer wall of the controller 12 with a cable, and the output signal line of the GPS module 20 included in the cable is provided in the controller 12 (see the position monitor 16 of the present invention). It is electrically connected to the “position data accumulation control unit”.

  The GPS module 20 detects its own position by a radio signal from the satellite 30 (see FIG. 4), and outputs the detection result as latitude and longitude data. The GPS module 20 is normally operated by receiving power from an external power source 40 provided in the factory. When the power supply from the external power source 40 is stopped, the GPS module 20 receives power from the battery 23 and intermittently (for example, Every few minutes). In addition, latitude / longitude data output from the GPS module 20 during operation by the battery 23 is stored in a nonvolatile memory 22 (corresponding to the “position storage means” of the present invention) such as a flash memory or an EEPROM. In the ultra-precision processing machine 10, the power supply changeover switches 24 and 26 that selectively connect the GPS module 20 and the controller 12 to either the battery 23 or the external power supply 40, and the battery 23 for charging. A charging circuit 25 and the like are provided.

  The position monitoring unit 16 stores initial position data in the built-in memory 17. This initial position data is composed of the maximum and minimum values of latitude and longitude, and the “operation allowable range” according to the present invention is an area that falls between the maximum and minimum values of latitude and longitude. Is set. Here, the manufacturer of the ultraprecision machine 10 can set the data of the initial position so that, for example, the customer's factory to which the ultraprecision machine 10 is delivered falls within the allowable operating range.

  Further, the position monitoring unit 16 reads the position inspection program P1 shown in FIG. 3 from the memory 17 and executes it at a predetermined cycle. Hereinafter, the operation of the ultraprecision machine 10 will be described with reference to FIG.

  The position monitoring unit 16 determines whether or not the power receiving unit 12J included in the controller 12 receives power from the external power supply 40 (S1, corresponding to “power reception detecting unit” of the present invention). Here, for example, when the ultra-precision processing machine 10 is transported toward the relocation destination, the power supply from the external power supply 40 is stopped. In this case (NO in S1), the power supply switch 24, 26 is switched (S2), and both the controller 12 and the GPS module 20 are connected to the battery 23. As a result, the position monitoring unit 16 executes the position inspection program P1 even during a period in which the power supply from the external power source 40 is stopped (that is, during transportation to the relocation destination), and the GPS module 20 detects the satellite 30 (FIG. 4 And a latitude / longitude data of the current position of the ultraprecision machine 10 is output.

  Next, the position monitoring unit 16 acquires the latitude / longitude data output from the GPS module 20 (S3). The position monitoring unit 16 checks whether or not the current position of the ultraprecision machine 10 can be recognized from the output data of the GPS module 20 (S4). If the current position of the ultraprecision machine 10 can be recognized (YES in S4), the latitude / longitude data is stored in the nonvolatile memory 22 (S5), and the data accumulation flag is turned on (S6). Then, during the period when the power supply from the external power source 40 is stopped (when the battery 23 is activated), the processing of the above steps S1 to S6 is repeatedly executed, and the latitude / longitude data acquired from the GPS module 20 is obtained each time. Store in the nonvolatile memory 22. Here, all latitude / longitude data acquired by the GPS module 20 is stored in the nonvolatile memory 22 as a history.

  When the ultra-precision processing machine 10 is delivered to the customer's factory recognized by the manufacturer and the external power supply 40 is turned on, the power supply of the GPS module 20 and the controller 12 is switched from the battery 23 to the external power supply 40 ( S7).

  Next, the data accumulation flag is checked (S8), the data accumulation flag is OFF (NO in S8), that is, when no latitude / longitude data is stored in the nonvolatile memory 22, the data is output from the GPS module 20. The current latitude / longitude data is acquired (S14). Next, it is checked whether or not the current position of the ultraprecision machine 10 can be recognized from the output data of the GPS module 20 (S15), and if the current position of the ultraprecision machine 10 can be recognized (YES in S15). The initial position data is compared with the current position of the ultraprecision machine 10 (S11, corresponding to the “position determination means” of the present invention). That is, it is determined whether or not the current position of the ultraprecision machine 10 is out of the allowable operating range. If the current position of the ultraprecision machine 10 cannot be recognized from the output data of the GPS module 20 (NO in S15), the process returns to step S1 while the operation of the HMI unit 14 is prohibited.

  When the current position of the ultra-precision machine 10 is within the allowable operation range (NO in S12), that is, the current position is within the maximum and minimum values of latitude and longitude as the initial position data. In this case, the operation of the HMI unit 14 is permitted and the process returns to the step S1. Thereby, by the operation of the HMI unit 14, for example, power supply to the numerical calculation unit 15 and the processing machine main body 11 is started, the ultra-precision processing machine 10 becomes operable, and the workpiece can be subjected to predetermined ultra-precision processing.

  On the other hand, in places outside the allowable operating range, for example, in foreign countries where the export of the ultra-precision machine 10 is prohibited, or in companies that the manufacturer of the ultra-precision machine 10 does not want to use, the ultra-precision machine 10 If is illegally transferred, it is as follows. When the external power supply 40 of the ultraprecision machine 10 is turned on at an unauthorized transfer destination, it is determined that the current position of the ultraprecision machine 10 is out of the allowable operating range (YES in S12). Then, a part of the HMI unit 14 is destroyed (for example, the program is erased) and the HMI unit 14 cannot be operated (S13), and the ultraprecision machine 10 becomes inoperable.

  By the way, since the ultra-precision machine 10 is usually installed indoors where radio waves from the satellite 30 are difficult to reach, the GPS module 20 may not be able to detect the position of the installation location. When it is outdoors, the GPS module 20 can reliably detect the position. Therefore, in the ultraprecision processing machine 10 of the present embodiment, the GPS module 20 detects the period when the power supply by the external power supply 40 is stopped, that is, during the period when the ultraprecision processing machine 10 is moving outdoors. Based on the latitude / longitude data obtained, it is determined whether or not the ultraprecision machine 10 is within the allowable operating range.

  Specifically, when the data accumulation flag is ON (YES in S8), that is, when latitude / longitude data is accumulated in the nonvolatile memory 22, the latest latitude / longitude data among the latitude / longitude data is stored. Is captured by the position monitoring unit 16 (S9), the data accumulation flag is turned OFF (S10), and the latest latitude / longitude data captured is compared with the initial position data (S11). Here, when the data accumulation flag is switched to OFF, the stored contents of the nonvolatile memory 22 may be cleared.

  If the latest latitude / longitude data (obtained immediately before being brought into the room) is within the allowable operation range (NO in S12), the operation of the HMI unit 14 is permitted and the operation in step S1 is performed. Return to processing. As a result, the workpiece can be subjected to predetermined ultraprecision machining as described above.

  On the other hand, when the latest latitude / longitude data is out of the allowable operating range (YES in S12), the HMI unit 14 is disabled as described above (S13), and the ultraprecision machine 10 is disabled. To do.

  As described above, according to the ultraprecision processing machine 10 of the present embodiment, even when the ultraprecision processing machine 10 is installed indoors where radio waves are difficult to reach, it is detected before being carried into such a place. Based on the latest latitude / longitude data, it is determined whether or not the ultra-precision processing machine 10 is within the allowable operating range, and if it is out of the allowable operating range, the operation becomes impossible. It can be surely prevented and fraudulent relocation itself can be reduced. In addition, since the GPS module 20 is used to detect the position of the ultraprecision processing machine 10, it is possible to detect a relatively detailed current position based on the latitude and longitude. In addition, since the GPS module 20 is configured to operate intermittently when connected to the battery 23, the power consumption of the battery 23 can be suppressed. Further, since the position monitoring unit 16 disables the HMI unit 14, it is possible to notify a person who has performed an unauthorized operation that the operation is not possible.

  Further, since all the latitude / longitude data detected by the GPS module 20 is stored in the non-volatile memory 22 during a period in which no power is received from the external power supply 40, the latitude / longitude data is stored. It becomes possible to know the movement locus (transport route) of the ultraprecision machine 10.

[Second Embodiment]
The second embodiment is different from the first embodiment in the contents of the position inspection program P1. That is, as shown in FIG. 5, when the power supply from the external power supply 40 is started (YES in S1), the current latitude / current output from the GPS module 20 is switched after the power supply is switched (S7). Longitude data is acquired (S14). Next, it is checked whether or not the current position of the ultraprecision machine 10 can be recognized from the output data of the GPS module 20 (S15). If the current position of the ultraprecision machine 10 can be recognized (Yes in S15). The initial position data is compared with the current position of the ultraprecision machine 10 (S11).

  On the other hand, if the ultra-precision machine 10 cannot be recognized because it is installed indoors or in a place where it is difficult to receive radio waves from the satellite 30 such as behind an obstacle (NO in S15), the data accumulation flag (S8) and the data accumulation flag is ON (YES in S8), that is, when latitude / longitude data is accumulated in the nonvolatile memory 22, the latest latitude / longitude of the latitude / longitude data is checked. The position monitoring unit 16 fetches the data (S9), turns off the data accumulation flag (S10), and compares the latest latitude / longitude data fetched with the initial position data (S11). Hereinafter, as in the first embodiment, when the latitude / longitude data is within the allowable operation range (NO in S12), the operation of the HMI unit 14 is permitted and the operation is outside the allowable operation range (S12). (YES), the operation of the HMI unit 14 is prohibited (S13), and the ultraprecision machine 10 is disabled. Since other configurations are the same as those of the first embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  As in the present embodiment, when the current position can be detected by the GPS module 20 at the relocation location of the ultra-precision processing machine 10, it is determined whether or not the current position is within the allowable operating range. If the position cannot be detected, the latest position stored in the non-volatile memory 22 may be fetched to determine whether the latest position is within the allowable operating range.

[Third Embodiment]
The third embodiment is different from the first embodiment in the contents of the position inspection program P1. That is, as shown in FIG. 6, when it is determined that the latitude / longitude data detected by the GPS module 20 is outside the allowable operating range (YES in S12), the password is requested (S16). When an inappropriate password is input (No in S17), the activation of the HMI unit 14 is prohibited (S13). On the other hand, when a valid password is input (YES in S17), the HMI unit 14 Is allowed to start. Since other configurations are the same as those of the first embodiment, the same portions are denoted by the same reference numerals, and redundant description is omitted.

  According to the present embodiment, when unauthorized transfer is not performed, for example, the customer of the delivery destination recognized by the manufacturer of the ultra-precision machine 10 has moved the ultra-precision machine 10 to a newly built factory. When the operation is out of the permissible operating range, the manufacturer is requested to dispatch a person in charge, and by inputting a proper password, the ultra-precision processing machine 10 can be operated as an emergency measure. Then, as a permanent measure, for example, a measure such as changing data of the initial position (operation allowable range) stored in the memory 17 of the ultraprecision machine 10 may be taken.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

  (1) In the above-described embodiment, the ultraprecision machine 10 is illustrated as an example of the transfer restriction device. However, the transfer restriction device is not limited to a machine tool such as an ultraprecision machine, and may be a personal computer, a radio, or a television. Appliances such as automobiles, airplanes, construction machinery, robots, etc. are also included in the transfer restriction devices.

  (2) Instead of the GPS module 20 of the above embodiment, for example, based on whether radio waves, television waves, radio clock radio waves, or PHS radio waves that can be received in Japan are received, an ultra-precision processing machine It may be possible to detect whether or not the current position of 10 is in Japan. As a result, it is possible to detect whether or not the position of the ultraprecision processing machine 10 is in Japan at a lower cost than the GPS module, and to make the ultraprecision processing machine 10 inoperable when it is illegally exported. it can.

  (3) In addition to the GPS module 20 of the above-described embodiment, the following configuration is provided as an acceleration sensor and auxiliary position detection means capable of detecting the position or movement distance by integrating the acceleration detected by the acceleration sensor twice. It may be operated as follows.

  That is, the position monitoring unit 16 stores the detection result of the auxiliary position detection unit in the nonvolatile memory 22 together with the latitude / longitude data of the GPS module 20, and the latest position detected by the GPS module 20 is stored in the GPS module. After the position detection by 20 becomes impossible, it is corrected using the detection result of the auxiliary position detection means stored in the nonvolatile memory 22, and it is determined whether or not the corrected latest position is out of the allowable operating range. You may make it do.

  In this way, even if the GPS module 20 becomes unable to receive radio waves during transportation and is transferred to a place outside the allowable operating range as it is, the ultraprecision machine 10 is made inoperable to prevent damage. be able to.

( 4 ) In the above-described embodiment, the ultra-precision machine is disabled by destroying a part of the HMI unit 14, but the controller 12 other than the HMI unit 14 (for example, the numerical calculation unit 15), It may be made inoperable by destroying a part of the processing machine body 11.

( 5 ) In the above embodiment, when an illegal act such as cutting the signal line between the position monitoring unit 16 and the HMI unit 14 or the signal line between the GPS module 20 and the position monitoring unit 16 is performed. The super precision machine 10 may be configured to be inoperable. Thereby, illegal transfer can be prevented more reliably.

( 6 ) The operation permissible range may be divided into a plurality of stages, and the inoperable processing of the transfer restriction device may be varied for each stage. For example, a factory of a predetermined company in Japan is set as the first allowable operating range, and Japan itself is set as the second allowable operating range, which is outside the first allowable operating range and within the second allowable operating range. If there is a transfer restriction device that is inoperable to the extent that it can be operated on the condition that a password is entered, and if it is outside the second allowable operating range, the transfer restriction device is partially destroyed and cannot be restarted. You may comprise.

( 7 ) In the above embodiment, the latitude / longitude data output from the GPS module 20 is once taken into the position monitoring unit 16 and then stored in the nonvolatile memory 22. Latitude / longitude data may be directly stored in the nonvolatile memory 22.

1 is a perspective view of an ultraprecision machine according to a first embodiment of the present invention. Block diagram of ultra-precision machine Flow chart of position inspection program Perspective view of the state where the ultra-precision processing machine has moved Flowchart of a position inspection program according to the second embodiment Flowchart of a position inspection program according to the third embodiment

Explanation of symbols

10 Ultra-precision processing machine 12 Controller 12J Power receiving unit 14 Human interface unit (operation unit)
15 Numerical Operation Unit 16 Position Monitoring Unit (Position Data Accumulation Control Unit)
19 Drive unit 20 GPS module (position detection means)
22 Non-volatile memory (position storage means)
23 Battery (Internal power supply)
30 satellites

Claims (7)

Position detection means capable of detecting a position by receiving a signal from the outside;
Position storage means capable of storing the position detected by the position detection means;
A position data accumulation control unit for storing the position detected by the position detection unit in the position storage unit;
Position discriminating means for discriminating whether or not the latest position stored in the position storage means is out of a preset allowable operating range;
In the transfer restriction device which becomes inoperable when the latest position is out of the allowable operation range ,
A power receiving unit that receives power for operating the transfer restriction device from the outside;
Power reception detecting means for detecting whether or not the power reception unit receives power from the outside;
An internal power source for supplying power to the position detection unit and the position data storage control unit to operate during a period in which power supply from the outside to the power receiving unit is stopped,
The position data accumulation control unit stores the position detected by the position detection unit as a history and stores it in the position storage unit during a period in which power supply from the outside to the power receiving unit is stopped. Restricted equipment. The transfer restriction device according to claim 1 , wherein the position detection unit is configured to operate intermittently during a period in which power supply from the outside to the power reception unit is stopped . It said position detecting means, transfer restriction device according to claim 1 or 2, this and wherein a GPS module for position detection based on the radio signals from the satellites. Said position detecting means, transfer restrictions according to claim 1 or 2, characterized in that it is configured to detect whether it has received a receivable radio waves at a predetermined receiving area as the allowable operating range machine. The position detecting means is configured to detect whether or not a radio wave and / or a television wave and / or a radio clock radio wave and / or a PHS radio wave that can be received in Japan as the allowable operating range is received. transfer restriction device according to claim 1 or 2, characterized in that it is. An operation unit for operating the transfer restriction device, a numerical operation unit that performs a numerical operation in accordance with an operation of the operation unit, and a drive unit that is driven based on a calculation result of the numerical operation unit The transfer restriction device according to claim 1 , wherein the transfer restriction device is disabled by disabling at least a part of the operation unit . In a transfer restriction device in which free transfer is restricted, position detection means for detecting a position by receiving a signal from the outside, position storage means for storing the position detected by the position detection means, and external power supply An internal power source for supplying power to the position detecting means to operate it is fixed during the stop period, and the position detecting means detects during a period when the external power supply is stopped. The stored position is stored as a history in the position storage means, and the transfer restriction device is disabled when the latest position stored in the position storage means is out of a preset allowable operating range. A method for preventing unauthorized transfer of restricted transfer equipment.