Machine tool, control method, and program

Abstract

To provide a machine tool etc. ensuring high safety for a worker.SOLUTION: A machine tool according to an embodiment of the present disclosure includes a machine body, a main cage that surrounds the machine body, a safety fence that encloses at least a part of the main cage, an automatic door that is formed at a spot of the main cage enclosed with the safety fence and opens or closes through power supply, a safety fence door that is included in the safety fence and can open or close, a safety fence door detection unit that can detect the open or closed state of the safety fence door, and a control unit that controls the power supply to the automatic door on the basis of a result of detection by the safety fence door detection unit. The control unit determines whether a result of detection can be acquired from the safety fence door detection unit. When the result of detection can be acquired from the safety fence door detection unit, if the result of detection signifying that the safety fence is in the open state is acquired, the power supply to the automatic door is blocked. When the result of detection cannot be acquired from the safety fence door detection unit, the power supply to the automatic door is blocked.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present technology relates to a machine tool, a control method, and a program. [Background technology]

[0002] Conventionally, a system has been proposed that includes a processing machine having an automatically operated door and a safety fence that has a door that is manually opened and closed and surrounds the processing machine. For example, the processing machine of the system described in Patent Document 1 drives the door of the processing machine at different speeds depending on whether the door of the safety fence is open or closed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-064875 A Summary of the Invention [Problem to be solved by the invention]

[0004] It is necessary to ensure greater safety for workers who use processing machines (machine tools).

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a machine tool etc. that ensures high safety for workers. [Means for solving the problem]

[0006] A machine tool according to one embodiment of the present disclosure comprises a machine main body, a main body cage surrounding the machine main body, a safety fence covering at least a portion of the main body cage, an automatic door provided at a portion of the main cage covered by the safety fence and opened and closed by a power supply, a safety fence door provided on the safety fence and capable of being opened and closed, a safety fence door detection unit capable of detecting an open or closed state of the safety fence door, and a control unit that controls the supply of power to the automatic door based on the detection result of the safety fence door detection unit, wherein the control unit determines whether or not it is possible to obtain a detection result from the safety fence door detection unit, and when the detection result is possible from the safety fence door detection unit, if a detection result indicating that the safety fence is in an open state has been obtained, the control unit cuts off the supply of power to the automatic door, and if a detection result cannot be obtained from the safety fence door detection unit, the control unit cuts off the supply of power to the automatic door.

[0007] In the present disclosure, when the safety fence door is in an open state and the worker can put his / her hand inside the safety fence, the power supply to the automatic door is cut off. In other words, when the worker can work near the automatic door, for example, even if a movement command is sent to the automatic door to move it to an open or closed position, the automatic door will not move. This reduces the possibility that the worker will come into contact with the operating automatic door, making it possible to ensure high safety for the worker.

[0008] A machine tool according to one embodiment of the present disclosure comprises an auxiliary door provided in a portion of the main cage that is not covered by the safety fence, and an auxiliary door detection unit capable of detecting the open or closed state of the auxiliary door, and when the control unit is able to obtain a detection result from the safety fence door detection unit and obtains a detection result from the auxiliary door detection unit indicating that the auxiliary door is in an open state, the control unit cuts off the power supply to the automatic door.

[0009] In the present disclosure, when an operator is able to open the auxiliary door and perform work inside the machine tool, the power supply to the automatic door is cut off. In other words, when an operator is able to work near the automatic door inside the machine tool, the automatic door will not operate even if a movement command is sent to the automatic door to move it to an open or closed position. This reduces the possibility that the operator will come into contact with the operating automatic door, ensuring high safety for the operator.

[0010] In a machine tool according to one embodiment of the present disclosure, when a command to transition to a trial operation mode for checking the operation of the machine main body has been input and a detection result indicating that the safety fence door is in a closed state has been obtained from the safety fence door detection unit, the control unit supplies power to the automatic door even if the detection result obtained from the auxiliary door detection unit indicates an open state.

[0011] In the present disclosure, when the machine tool is in the test operation mode, the automatic door can be operated even if the auxiliary door is open. This allows the worker to visually check the operation of the automatic door and perform maintenance on the automatic door. The machine tool transitions to the test operation mode when a command is input by the worker. At this time, for example, the worker can only input a command to transition the machine tool to the test operation mode using a dedicated key, and safety is guaranteed during normal operation of the machine tool.

[0012] A machine tool according to one embodiment of the present disclosure cuts off the power supply to the automatic door when a detection result can be obtained from the safety fence door detection unit and a command to transition to a maintenance inspection mode for performing maintenance inspection of the machine body has been input.

[0013] In the present disclosure, it is possible to prevent the automatic door from operating unexpectedly when an operator performs maintenance and inspection of the machine body of a machine tool. During maintenance and inspection of the machine body, the operator manually cleans, disassembles, installs, or checks the contact of various parts or parts of the machine body. By preventing the automatic door from operating at this time, it is possible to reduce the possibility that the operator will come into contact with the operating automatic door, and ensure high safety for the operator.

[0014] A control method according to one embodiment of the present disclosure is a control method for a machine tool comprising: a machine main body, a main body cage surrounding the machine main body, a safety fence attached so as to cover at least a portion of the main body cage, an automatic door provided at a portion of the main body cage covered by the safety fence and opened and closed by a power supply, a safety fence door provided on the safety fence and capable of being opened and closed, a safety fence door detection unit capable of detecting an open or closed state of the safety fence door, and a control unit that controls the supply of power to the automatic door based on the detection result of the safety fence door detection unit, wherein the control method determines whether or not a detection result can be obtained from the safety fence door detection unit, and when the detection result can be obtained from the safety fence door detection unit, if a detection result indicating that the safety fence is in an open state has been obtained, the power supply to the automatic door is cut off, and if the safety fence is removed and no detection result can be obtained from the safety fence door detection unit, the power supply to the automatic door is cut off.

[0015] In the present disclosure, when the safety fence door is in an open state and the worker can put his / her hand inside the safety fence, the power supply to the automatic door is cut off. In other words, when the worker can work near the automatic door, for example, even if a movement command is sent to the automatic door to move it to an open or closed position, the automatic door will not move. This reduces the possibility that the worker will come into contact with the operating automatic door, making it possible to ensure high safety for the worker.

[0016] A program according to one embodiment of the present disclosure is a computer program for controlling a machine tool including a machine main body, a main body cage surrounding the machine main body, a safety fence attached so as to cover at least a portion of the main body cage, an automatic door attached to a portion of the main cage covered by the safety fence and opened and closed by a power supply, a safety fence door attached to the safety fence and capable of being opened and closed, a safety fence door detection unit capable of detecting an open or closed state of the safety fence door, and a control unit for controlling the supply of power to the automatic door based on the detection result of the safety fence door detection unit, and causes the computer to execute control to determine whether or not a detection result can be obtained from the safety fence door detection unit, and, when the detection result can be obtained from the safety fence door detection unit, cut off the supply of power to the automatic door if a detection result indicating that the safety fence is in an open state has been obtained, and cut off the supply of power to the automatic door if the safety fence is removed and no detection result can be obtained from the safety fence door detection unit.

[0017] In the present disclosure, when the safety fence door is in an open state and the worker can put his / her hand inside the safety fence, the power supply to the automatic door is cut off. In other words, when the worker can work near the automatic door, for example, even if a movement command is sent to the automatic door to move it to an open or closed position, the automatic door will not move. This reduces the possibility that the worker will come into contact with the operating automatic door, making it possible to ensure high safety for the worker.

[0018] A computer-readable storage medium having the above program stored thereon is also novel and useful. Effect of the Invention

[0019] In a machine tool or the like according to an embodiment of the present disclosure, it is possible to ensure high safety for workers. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a perspective view of the machine tool as viewed from the upper right front. [Diagram 2] FIG. 2 is a perspective view of the machine tool as viewed from the upper right front. [Diagram 3] FIG. 2 is a perspective view of the machine tool as viewed from the upper right front. [Figure 4] FIG. 1 is a schematic diagram of a machine tool as viewed from above. [Diagram 5] FIG. 2 is a block diagram showing a configuration example of a control device. [Figure 6] 4 is a flowchart illustrating a process of the control device. [Figure 7] FIG. 11 is a block diagram showing an example of the configuration of a control device according to a second embodiment. [Figure 8] 4 is a flowchart illustrating a method for determining the state of the safety fence door by the control device. [Figure 9] FIG. 11 is a perspective view of a machine tool according to a third embodiment, as viewed from the upper right front. [Figure 10] FIG. 11 is a block diagram showing an example of the configuration of a control device according to a third embodiment. [Figure 11] 11 is a flowchart illustrating a process of a control device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] (Embodiment 1) A machine tool and a control device according to embodiment 1 will be described below with reference to the drawings. In the following description, up, down, front, back, left and right shown in the drawings will be used.

[0022] 1, 2, and 3 are perspective views of the machine tool 1 as viewed from the upper right front. FIG. 1 shows the machine tool 1 with the automatic door 141, the auxiliary door 142, and the safety fence door 21 in a closed state. FIG. 2 shows the machine tool 1 with the automatic door 141 and the auxiliary door 142 in a closed state and the safety fence door 21 in an open state. FIG. 3 shows the machine tool 1 with the automatic door 141, the auxiliary door 142, and the safety fence door 21 in an open state. The machine tool 1 includes a machine body 1A, a body cage 14 that covers the machine body 1A, and a safety fence 2. The body cage 14 is substantially box-shaped surrounding the front, right, left, rear, and top of the machine body 1A, and includes a front surface 14a, a right side surface 14b, a left side surface 14c, a rear surface 14d, and an upper surface 14e. Each surface is substantially rectangular.

[0023] An automatic door 141 is provided on the front surface 14a of the main cage 14. The automatic door 141 is a sliding door that includes, for example, a ball screw mechanism (not shown) and a motor 15 (see FIG. 5), and is automatically opened and closed by the ball screw mechanism and the rotational power of the motor 15. When the motor 15 receives power (power) from a power supply circuit (power source) 16 (see FIG. 5), and receives a movement command including an open command to move the automatic door 141 to an open position or a close command to move the automatic door 141 to a closed position, the motor 15 generates a rotational power and transmits the rotational power to the automatic door 141 by the ball screw mechanism, thereby operating the automatic door 141.

[0024] An auxiliary door 142 is provided on the right side surface of the main cage 14. The auxiliary door 142 can be in a closed state shown in Figs. 1 and 2 and an open state shown in Fig. 3. In this embodiment, the auxiliary door 142 is a sliding door, but it may be a hinged door. The auxiliary door 142 is opened and closed manually by an operator, but it may be opened and closed automatically. In this embodiment, the auxiliary door 142 is provided on the right side surface 14b, but it may be provided on the left side surface 14c. The auxiliary door 142 may be provided on both the right side surface 14b and the left side surface 14c.

[0025] The main cage 14 is equipped with an auxiliary door detector 142a (see FIG. 5) that detects the open or closed state of the auxiliary door 142. The auxiliary door detector 142a is, for example, a limit switch, and is provided at a location that comes into contact with the auxiliary door 142 when it is in a closed state. That is, the auxiliary door detector 142a detects the closed state when the auxiliary door 142 is completely closed, and detects the open state when the auxiliary door is not completely closed. The auxiliary door detector 142a may be a magnetic proximity sensor or the like.

[0026] The main cage 14 has an operation panel 25 on the right side surface 14b. The location where the operation panel 25 is provided is not limited to the right side surface 14b. Details of the operation panel 25 will be described later (see FIG. 5).

[0027] The safety fence 2 has a front plate portion 2a extending in the up-down and left-right directions, and a right plate portion 2b and a left plate portion 2c extending in the up-down and front-rear directions. The front plate portion 2a connects the front ends of the right plate portion 2b and the left plate portion 2c. An opening 2d is provided in the front plate portion 2a. The safety fence 2 is attached (installed) so as to cover the front surface of the automatic door 141 of the main cage 14. The safety fence 2 may be installed so as to cover at least a part of the main cage 14 including the automatic door 141. The safety fence 2 may be installed so as to cover the entire main cage 14. In front of the automatic door 141, in the area surrounded by the safety fence 2, a transport device (not shown) is installed, for example, to transport a workpiece into the machine main body 1A.

[0028] A safety fence door 21 that closes the opening 2d when closed is provided on the front plate portion 2a of the safety fence 2. When the safety fence door 21 is in the open state, a worker can enter the inside of the safety fence 2 (the main cage 14 side) through the opening 2d.

[0029] The safety fence 2 is equipped with a safety fence door detection unit 21a (see FIG. 5) that detects the open or closed state of the safety fence door 21. The safety fence door detection unit is, for example, a limit switch, and is provided at a location that comes into contact when the safety fence door 21 is in a closed state. In other words, the safety fence door detection unit 21a detects the closed state when the safety fence door 21 is completely closed, and detects the open state when it is not completely closed. The safety fence door detection unit 21a may also be a magnetic proximity sensor, etc.

[0030] 4 is a schematic diagram of the machine tool as viewed from above. When the safety fence door 21 is open, a worker can enter inside the safety fence 2 through the opening 2d and approach the automatic door 141. When the auxiliary door 142 is open, a worker can enter inside the main cage 14 and approach the automatic door 141.

[0031] FIG. 5 is a block diagram showing a configuration example of the control device 50. The control device 50 includes a CPU (control unit) 51, a RAM 52, a storage unit 53, and the like. The storage unit 53 has a storage medium such as an EEPROM, an EPROM, a hard disk, and the like. The storage unit 53 stores various programs, such as an NC program for processing a workpiece and a control program for the automatic door 141. The storage medium may be, for example, a portable storage medium 53a (for example, a CD-ROM or a flash memory) shown in FIG. 5. In this case, the various programs stored in the portable storage medium 53a may be stored in the storage unit 53, or the portable storage medium 53a may be connected to the control device 50 to read out the various programs. In addition, the various programs may be stored in the storage unit 53 from a server via a network. The CPU 51 reads the various programs into the RAM 52 and executes the various programs. That is, the various programs are stored in a storage medium that is portable or non-portable, and constitute a program product.

[0032] The operation panel 25 is capable of displaying various types of information received from the control device 50 and inputting various types of information to be transmitted to the control device 50. The operation panel 25 accepts input of commands instructing the machine main body 1A to transition to various modes (normal mode, test operation mode, and maintenance and inspection mode).

[0033] The normal mode is a mode for machining a workpiece installed on the machine body 1A. When a command to switch to the normal mode is input, the machine body 1A switches to the normal mode. Also, when a command to switch to the test operation mode or a command to switch to the maintenance and inspection mode is not input to the operation panel 25 (normal time), the machine body 1A is in the normal mode.

[0034] The trial operation mode is a mode for an operator to check the operation of the machine body 1A. When a command to switch to the trial operation mode is input to the operation panel 25, the machine body 1A switches to the trial operation mode. When the machine body 1A is in the trial operation mode, the machine body 1A and the automatic door 141 can operate even if the auxiliary door 142 is open. The control device 50 may display an enable switch on the operation panel 25 and switch the machine body 1A to the trial operation mode when the enable switch is pressed on the operation panel 25. The control device 50 may also switch the machine body 1A to the trial operation mode when an enable switch provided on the main cage 14 is pressed. The operator can only input a command to switch the machine body 1A to the trial operation mode on the operation panel 25 using a dedicated key, and safety is guaranteed when the machine body 1A is in the normal mode.

[0035] The maintenance inspection mode is a mode for an operator to perform maintenance inspection of the machine body 1A. When a command to switch to the maintenance inspection mode is input to the operation panel 25, the machine body 1A and the automatic door 141 do not operate, regardless of the detection results obtained from the auxiliary door detection unit 142a and the safety fence door detection unit 21a.

[0036] The auxiliary door detection unit 142a detects whether the auxiliary door 142 is in an open state or a closed state, and outputs the detection result to the control device 50. The CPU 51 of the control device 50 acquires the detection result of the auxiliary door 142 from the auxiliary door detection unit 142a. The safety fence door detection unit 21a detects whether the safety fence door 21 is in an open state or a closed state, and outputs the detection result to the control device 50. The CPU 51 of the control device 50 acquires the detection result of the safety fence door 21 from the safety fence door detection unit 21a.

[0037] The control device 50 transmits to the motor 15 a movement command including an open command for moving the automatic door 141 to an open position or a close command for moving the automatic door 141 to a closed position. The control device 50 also controls the power supply to the motor 15 from the power supply circuit 16. When the CPU 51 of the control device 50 acquires a detection result that the automatic door 141 and the auxiliary door 142 are both closed while the machine body 1A is in the normal mode, the CPU 51 starts supplying power to the motor 15 from the power supply circuit 16. Note that the machine tool 1 may include an air cylinder and a compressor instead of the motor 15 and the power supply circuit 16. In this case, when the CPU 51 acquires a detection result that the automatic door 141 and the auxiliary door 142 are both closed while the machine body 1A is in the normal mode, the CPU 51 starts supplying power (air) to the air cylinder from the compressor.

[0038] 6 is a flow chart for explaining the processing of the control device 50. For example, when a command to start the machine tool 1 is input to the operation panel 25, the CPU 51 of the control device 50 starts the following processing. The CPU 51 acquires a command to switch the mode input to the operation panel 25 (S1). If a command to switch the mode is not input to the operation panel 25 in S1, the CPU 51 acquires information indicating that no command has been input. The CPU 51 acquires the detection result of the auxiliary door 142 from the auxiliary door detection unit 142a (S2). The CPU 51 acquires the detection result of the safety fence door 21 from the safety fence door detection unit 21a (S3).

[0039] The CPU 51 judges whether the machine main body 1A is in the normal mode or not (S4). If a command to switch to the normal mode has been input or if a command to switch to the test operation mode or the maintenance inspection mode has not been input, the CPU 51 judges that the machine main body 1A is in the normal mode, and if a command to switch to the test operation mode or the maintenance inspection mode has been input, the CPU 51 judges that the machine main body 1A is not in the normal mode.

[0040] When the machine main body 1A is in the normal mode (S4: YES), the CPU 51 judges whether the auxiliary door 142 is in the closed state or not based on the detection result acquired from the auxiliary door detection unit 142a (S5). When the auxiliary door 142 is not in the closed state (open state) (S5: NO), the CPU 51 makes the power supply circuit 16 cut off the power supply to the motor 15 (S6) and returns the process to S1. Note that, when the power supply from the power supply circuit 16 to the motor 15 is originally cut off in S6, the CPU 51 makes the power supply circuit 16 maintain the state in which the power supply to the motor 15 is cut off. When the auxiliary door 142 is in the closed state (S5: YES), the CPU 51 judges whether the safety fence door 21 is in the closed state or not based on the detection result acquired from the safety fence door detection unit 21a (S7). If the safety fence door 21 is not closed (open) (S7: NO), the CPU 51 causes the power supply circuit 16 to cut off the power supply to the motor 15 (S6) and returns the process to S1. If the safety fence door 21 is closed (S7: YES), the CPU 51 causes the power supply circuit 16 to supply power to the motor 15 (S8) and returns the process to S1. Note that if power is already being supplied from the power supply circuit 16 to the motor 15 in S8, the CPU 51 causes the power supply circuit 16 to maintain the power supply to the motor 15.

[0041] If the machine body 1A is not in the normal mode (S4: NO), the CPU 51 judges whether the machine body 1A is in the trial operation mode (S9). In S9, if a command to switch to the trial operation mode is input to the operation panel 25, the CPU 51 judges that the machine body 1A is in the trial operation mode, and if a command to switch to the maintenance and inspection mode is input to the operation panel 25, the CPU 51 judges that the machine body 1A is not in the trial operation mode (is in the maintenance and inspection mode). If the machine body 1A is in the trial operation mode (S9: YES), the CPU 51 advances the process to S7. If the machine body 1A is not in the trial operation mode (is in the maintenance and inspection mode) (S9: NO), the CPU 51 causes the power supply circuit 16 to cut off the power supply to the motor 15 (S10) and returns the process to S1. Note that, if the power supply from the power supply circuit 16 to the motor 15 has been cut off from the beginning in S10, the CPU 51 causes the power supply circuit 16 to maintain the state in which the power supply to the motor 15 is cut off.

[0042] According to the configuration and processing of this embodiment, when the safety fence door 21 or the auxiliary door 142 is open and an operator can work near the automatic door 141, the power (power) supply from the power circuit 16 to the motor 15 is cut off. This reduces the possibility that the operator will come into contact with the operating automatic door, thereby ensuring high safety for the operator. Note that when the machine body 1A is in the trial operation mode, even if the auxiliary door 142 is open, power is supplied from the power circuit 16 to the motor 15, allowing the automatic door 141 to operate. This allows the operator to visually check the operation of the automatic door 141.

[0043] (Embodiment 2) The machine tool 1 according to the second embodiment is equipped with two safety fence door detection units that detect the safety fence door 21. The control device 50 of the machine tool 1 issues an alarm when the detection results by the two safety fence door detection units differ. The following describes the differences between the second embodiment and the first embodiment. The same reference symbols as in the first embodiment are used for the processes and configurations that are common to the first embodiment, and descriptions thereof will be omitted.

[0044] 7 is a block diagram showing a configuration example of a control device 50 according to embodiment 2. The control device 50 according to embodiment 2 acquires detection results of the safety fence door from each of the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2. The first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 are limit switches like the safety fence door detection unit 21a according to embodiment 1, but one or both of them may be magnetic proximity sensors or the like.

[0045] Fig. 8 is a flowchart illustrating a method for determining the state of the safety fence door 21 by the control device 50. The CPU 51 of the control device 50 executes the following process, for example, instead of S3 shown in Fig. 6. The CPU 51 of the control device 50 acquires the detection results of the safety fence door 21 from the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 (S21). The CPU 51 determines whether or not the detection result of the first safety fence door detection unit 21a1 and the detection result of the second safety fence door detection unit 21a2 match (S22).

[0046] When the detection results match (S22: YES), the CPU 51 judges whether or not both of the detection results of the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 indicate the closed state of the safety fence door 21 (S23). When both of the detection results of the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 indicate the closed state of the safety fence door 21 (S23: YES), the CPU 51 judges that the safety fence door 21 is in the closed state (S24) and ends the process. When both of the detection results of the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 do not indicate the closed state of the safety fence door 21 (both indicate the open state of the safety fence door 21) (S23: NO), the CPU 51 judges that the safety fence door 21 is in the open state (S25) and ends the process.

[0047] If the detection results do not match (S22: NO), the CPU 51 issues an alarm (S26) and ends the process. In S26, the CPU 51 issues an alarm, for example, by displaying on the operation panel 25 a message indicating that the detection results of the first safety fence door detection unit 21a1 and the second safety fence door detection unit 21a2 do not match, or by emitting an alarm sound. Note that the CPU 51 may execute a process such as stopping the operation of the machine main body 1A or cutting off the power supply from the power supply circuit 16 to the motor 15 instead of or in addition to the process related to S26.

[0048] According to the configuration and processing of this embodiment, it is possible to detect the state of the safety fence door 21 with high accuracy, and ensure higher safety for workers.

[0049] (Embodiment 3) A control device 50 of a machine tool 1 according to the third embodiment causes a power supply circuit 16 to cut off the power supply to a motor 15 when a safety fence 2 is removed from the machine tool 1. Differences between the third embodiment and the first embodiment will be described below. Processes and configurations common to the first embodiment are given the same reference numerals as the first embodiment, and description thereof will be omitted.

[0050] FIG. 9 is a perspective view of the machine tool according to the third embodiment, as seen from the upper right front. In the third embodiment, a case will be described where the safety fence 2 has been removed from the machine tool 1. FIG. 9 shows the machine tool 1 with the safety fence 2 removed. When the safety fence 2 has been removed from the machine tool 1, an operator can easily approach the automatic door. If the automatic door 141 opens and closes automatically when the safety fence 2 has been removed, an operator may come into contact with the door in operation. When the safety fence 2 is not provided on the machine tool 1, the control device 50 (see FIG. 10) of the machine tool 1 according to the third embodiment cuts off the power supply from the power supply circuit 16 to the motor 15, and does not operate the automatic door 141.

[0051] 10 is a block diagram showing an example of the configuration of a control device 50 according to the third embodiment. When a safety fence 2 is not provided on the machine tool 1, the safety fence door detection unit 21a is not connected to the control device 50, and the control device 50 cannot receive a signal indicating the detection result output from the safety fence door detection unit 21a. In other words, the CPU 51 of the control device 50 cannot acquire the detection result of the safety fence door 21 from the safety fence door detection unit 21a. The CPU 51 of the control device 50 according to the third embodiment determines whether or not the safety fence door 21 is provided on the machine tool 1 based on the presence or absence of an output of a signal from the safety fence door detection unit 21a to the control device 50.

[0052] FIG. 11 is a flowchart for explaining the processing of the control device 50 according to the third embodiment. The CPU 51 of the control device 50 according to the third embodiment judges whether or not the detection result can be acquired from the safety fence door detection unit 21a (S31). When there is no signal output from the safety fence door detection unit 21a to the control device 50 and the CPU 51 cannot acquire the detection result (for example, when the CPU 51 has not acquired the detection result from the safety fence door detection unit 21a for a predetermined period of time or more) (S31: NO), the CPU 51 causes the power supply circuit 16 to cut off the power supply to the motor (S37). That is, when the CPU 51 cannot acquire the detection result from the safety fence door detection unit 21a, there is a possibility that the safety fence 2 has been removed from the main cage 14, so the CPU 51 cuts off the power supply so that the automatic door 141 cannot operate. When there is a signal output from the safety fence door detection unit 21a to the control device 50 and the CPU 51 can acquire the detection result (S31: YES), the CPU 51 advances the processing to S32. S32 to S41 are the same processes as S1 to S10 shown in Fig. 6. After cutting off the power supply from power supply circuit 16 to motor 15 in S37 or S41, or after causing power supply circuit 16 to supply power to motor 15 in S39, CPU 51 returns the process to S31.

[0053] According to the configuration and processing of this embodiment, when the safety fence 2 is removed from the machine tool 1 and the worker can approach the automatic door 141, it is possible to prevent the worker from touching the operating automatic door 141 by cutting off the power supply from the power circuit 16 to the motor 15. The automatic door 141 according to the third embodiment may be manually opened and closed by the worker. In addition, in S31, when the CPU 51 of the control device 50 cannot receive a signal from the safety fence door detection unit 21a by inputting a short code, for example, the CPU 51 of the control device 50 may determine that the safety fence door detection unit 21a is not connected. In addition, when a safety fence attached to a machine tool of a different model from the machine tool 1 is provided and the signal indicating the detection result of the safety fence door received by the control device 50 is different from the signal transmitted from the safety fence door detection unit 21a, the CPU 51 of the control device 50 may determine that the safety fence door detection unit 21a is not connected.

[0054] (Modification) Conventionally, automatic doors installed in machine tools have been automatic doors that operate, for example, by belt drive. In contrast, the automatic door 141 installed in the above-mentioned machine tool 1 is an automatic door that operates by a motor 15 and a ball screw mechanism, and opens and closes faster than conventional automatic doors. Conventional machine tools are equipped with a speed detection unit that detects the opening and closing speed of the automatic door installed therein, and issues an alarm when the speed detected by the speed detection unit is equal to or higher than a predetermined value. This makes it possible to reduce the possibility that an operator will come into contact with the operating automatic door 141 even when the automatic door 141 is installed in a conventional machine tool that is a different model from the machine tool 1. The motor 15 outputs a signal indicating the opening and closing speed of the automatic door 141 to a control device of the machine tool in which the automatic door 141 is installed, and the control device may issue an alarm or cut off the power supply from the power supply circuit to the motor 15 based on the received signal.

[0055] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The technical features described in each embodiment can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and equivalents to the scope of the claims. In addition, the independent claims and dependent claims described in the claims can be combined with each other in all combinations regardless of the reference format. Furthermore, the claims use a format in which a claim references two or more other claims (multiple claim format), but this is not limited to this. A format in which a multiple claim (multi-multi claim) that references at least one multiple claim may be used. [Explanation of symbols]

[0056] 1 Machine tools 1A Machine body 2 Safety fence 14 Main Cage 15 Motor 16 Power circuit (power source) 21 Safety fence door 21a Safety fence door detector 21a1 First safety fence door detection section 21a2 Second safety fence door detection section 25 Operation Panel 50 Control device 53 Storage section 53a Removable storage media 141 Automatic Door 142 Auxiliary Door 142a Auxiliary door detector

Claims

1. The machine body, a main body cage surrounding the machine main body; a safety fence covering at least a portion of the main cage; an automatic door that is provided at a portion of the main cage covered by the safety fence and that opens and closes by power supply; A safety fence door provided on the safety fence and capable of being opened and closed; a safety fence door detection unit capable of detecting an open or closed state of the safety fence door; a control unit that controls the supply of power to the automatic door based on a detection result of the safety fence door detection unit; Equipped with The control unit is determining whether or not a detection result can be acquired from the safety fence door detection unit; When a detection result can be obtained from the safety fence door detection unit, if a detection result indicating that the safety fence is in an open state is obtained, the power supply to the automatic door is cut off; When a detection result cannot be obtained from the safety fence door detection unit, power supply to the automatic door is cut off. Machine tools.

2. an auxiliary door provided at a portion of the main cage that is not covered by the safety fence; an auxiliary door detection unit capable of detecting an open or closed state of the auxiliary door; Equipped with The control unit cuts off the power supply to the automatic door when a detection result indicating that the auxiliary door is open is obtained from the auxiliary door detection unit in a case where the control unit is able to obtain a detection result from the safety fence door detection unit. The machine tool according to claim 1.

3. When a command to transition to a test operation mode for checking the operation of the machine body is input and a detection result indicating that the safety fence door is in a closed state is obtained from the safety fence door detection unit, the control unit supplies power to the automatic door even if the detection result obtained from the auxiliary door detection unit indicates an open state.

3. The machine tool according to claim 2.

4. When a detection result can be acquired from the safety fence door detection unit, if a command to transition to a maintenance inspection mode for performing maintenance inspection of the machine body is input, power supply to the automatic door is cut off. The machine tool according to claim 1.

5. The machine body, a main body cage surrounding the machine main body; a safety fence attached so as to cover at least a portion of the main cage; an automatic door that is provided at a portion of the main cage covered by the safety fence and that opens and closes by power supply; A safety fence door provided on the safety fence and capable of being opened and closed; a safety fence door detection unit capable of detecting an open or closed state of the safety fence door; a control unit that controls the supply of power to the automatic door based on a detection result of the safety fence door detection unit; A method for controlling a machine tool comprising: determining whether or not a detection result can be acquired from the safety fence door detection unit; When a detection result can be obtained from the safety fence door detection unit, if a detection result indicating that the safety fence is in an open state is obtained, the power supply to the automatic door is cut off; When the safety fence is removed and a detection result cannot be obtained from the safety fence door detection unit, power supply to the automatic door is cut off. Control methods.

6. The machine body, a main body cage surrounding the machine main body; a safety fence attached so as to cover at least a portion of the main cage; an automatic door that is provided at a portion of the main cage covered by the safety fence and that opens and closes by power supply; A safety fence door provided on the safety fence and capable of being opened and closed; a safety fence door detection unit capable of detecting an open or closed state of the safety fence door; a control unit that controls the supply of power to the automatic door based on a detection result of the safety fence door detection unit; A computer program for controlling a machine tool comprising: determining whether or not a detection result can be acquired from the safety fence door detection unit; When a detection result can be obtained from the safety fence door detection unit, if a detection result indicating that the safety fence is in an open state is obtained, the power supply to the automatic door is cut off; When the safety fence is removed and a detection result cannot be obtained from the safety fence door detection unit, power supply to the automatic door is cut off. A program that causes a computer to execute control.

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