JP7077450B2 - How to reduce power consumption in wireless communication equipment and wireless communication equipment - Google Patents

Description

The present invention relates to a method for reducing power consumption in a wireless communication device and the wireless communication device, and the present invention relates to a method for reducing power consumption in the wireless communication device and the wireless communication device, which are particularly suitable for sensors of machine tools equipped with tools and measuring tools.

In order to suppress the power consumption of the battery-powered power supply that operates the wireless communication device located remotely, the wireless communication device is put to sleep during the time when the wireless communication is not required, and the wireless communication is required. It is known to start or restart the wireless communication device at the time. For example, in the position detection sensor described in Patent Document 1, after attaching the probe to the spindle of the machine tool instead of the machining tool, the probe is rotated for a short time to react with the centrifugal switch built in the probe, and the position detection sensor is used. It is running.

Since the position detection sensor described in Patent Document 1 detects the centrifugal force applied to the probe, there is a possibility of detecting the acceleration caused by other than the rotational movement of the probe. Therefore, the object position sensing probe described in Patent Document 2 includes a switch or another sensor in order to supply electric power from the battery according to the movement of the probe used in the machine tool. This switch responds to both the rotation and linear acceleration of the probe in the spindle of the machine tool, but because it has a circuit that distinguishes between the rotational movement of the probe and the linear acceleration, operations other than measurement with the probe, such as the probe, Ignoring the detection of centrifugal force due to the mounting operation, etc., wasteful battery consumption is suppressed.

Further, Patent Document 3 describes another method of suppressing the power consumption of a conventional wireless communication device arranged remotely. The wireless communication device described in this publication is used for machine tools and the like, and includes a spectral diffusion RF communication unit such as a Bluetooth (registered trademark) module and an auxiliary RF receiver unit. The spread spectrum RF communication unit is activated when the auxiliary RF receiver unit receives a characteristic RF signal. Since the power consumption of the auxiliary RF receiver unit is much lower than the power consumption of the spectral diffusion RF communication unit, a standby mode with low power consumption is possible.

U.S. Pat. No. 4,599,524 Special Publication No. 2006-52293 Special Publication No. 2011-504671

The position detection sensor described in Patent Document 1 can certainly suppress the consumption of the battery until the centrifugal force acts, but since the centrifugal force is detected even in an operation other than the measurement by the probe, the time other than the original detection work can be performed. Is energized, and the power consumption during that period cannot be ignored. Especially when the probe is attached to the tip of the spindle of the machine tool, it is not possible to supply power by wire, so the battery must be used, and energization other than the original measurement work time accelerates the consumption of the battery and replaces it. Brings an increase in frequency.

In order to suppress energization other than the original measurement work time, in Patent Documents 2 and 3 that detect the rotational movement at the time of measurement, only the centrifugal force is detected, so that the measurement and other work are performed. It can be distinguished and battery consumption can be suppressed. However, in the position detection sensors described in these patent documents, a large amount of electric power is applied between energizing the detection unit to obtain measurement data and energizing the communication unit to wirelessly communicate the obtained data. Differences are not taken into account. In general, the power consumption of the measuring unit is several to several tens of times the power consumption of the communication unit. Therefore, it is desirable to suppress the power consumption of the measuring unit during unmeasured communication.

The present invention has been made in view of the above-mentioned defects of the prior art, and an object thereof is to suppress the power consumption of a battery of a remotely arranged sensor that uses a battery, and in particular, a machining center or the like. Suppresses or reduces the power consumption of the battery of the length measuring instrument or sensor when the information from the length measuring instrument or position detection, temperature, vibration, etc. measurement or monitoring sensor attached to the machine tool is acquired wirelessly. There is something in it. Another object of the present invention is to extend the battery life, reduce the frequency of battery replacement, and substantially eliminate the inconvenience of replacement frequency even if a commercially available battery is used. It is to realize a device and a sensor.

A feature of the present invention that achieves the above object is a wireless communication device that wirelessly communicates between a base station and a gauge having a battery arranged in a machine tool, which is provided at least in the gauge and has a predetermined size. When the above vibration or displacement is detected, the energizing means for energizing the communication unit communicating with the base station from the battery and the physical quantity predetermined by the stylus attached to the machine tool at the same time or after that are applied. The measurement unit to be measured is energized to shift to the measurement mode, and after the gauge measurement is completed, only the communication unit is energized to communicate between the base station and the communication unit, and the measurement unit is de-energized. It is to shift to the standby mode.

In this feature, after the measurement by the measuring unit is completed or before the measurement, when the communication unit completes the communication, both the communication unit and the measuring unit and the battery are de-energized. To have a mode.
And also in this feature, the machine tool is either an automated tool replaceable machining center or a compound lathe, and the gauge is a length gauge, position detection sensor, temperature sensor, vibration sensor, pressure sensor, humidity sensor. At least one of.

Another feature of the present invention that achieves the above object is that the gauge has a predetermined size in a method for reducing power consumption in a wireless communication device that wirelessly communicates between a base station and a gauge having a battery arranged in a machine tool. When the above vibration or displacement is detected, the starting means is activated to energize the communication unit provided at least in the gauge and communicate with the base station from the battery, and simultaneously or thereafter to the machine tool. The attached stylus energizes the measuring unit that measures a predetermined physical quantity to shift to the measurement mode, and after the gauge measurement is completed, the communication unit communicates between the base station and the communication unit. The purpose is to shift to a standby mode in which only the measuring unit is energized and the measuring unit is de-energized.

In this feature, after the measurement by the measuring unit is completed or before the measurement, when the communication unit completes the communication, both the communication unit and the measuring unit and the battery are de-energized. Has a mode.
And also in this feature, the machine tool is either an automated tool replaceable machining center or a compound lathe, and the gauge is a length gauge, position detection sensor, temperature sensor, vibration sensor, pressure sensor, humidity sensor. At least one of.

According to the present invention, in machine tools such as machining centers and compound lathes that can change automatic tools, length measuring instruments such as electric micrometer and optical scale that can sense the machining state by wireless communication, position detection probe, and temperature sensor. Since the energization time from the battery to the measuring unit used for measuring gauges such as vibration sensor, pressure sensor, pressure sensor, humidity sensor and the communication unit used for communication is controlled, the measuring time of the measuring unit that consumes a lot of power is controlled. Can be substantially limited to the required time and battery consumption can be suppressed. In addition, since it is possible to extend the battery life, the frequency of battery replacement can be reduced, and JIS standard batteries that are generally available on the market can be used, so that the auto tool change work does not make you feel the inconvenience of battery replacement frequency. It will be possible.

It is a schematic front view of an Example of the machining center which concerns on this invention and the wireless communication apparatus provided therein. It is a block diagram of an example of the gauge provided in the machining center which concerns on this invention. It is an example of the time chart of the machining center which concerns on this invention, and is the figure which shows the operation state. It is an example of the time chart of the gauge shown in FIG. 2, and is the figure explaining each operation mode of the gauge part. It is a flow chart which shows the operation of the machining center which concerns on this invention. It is a flow chart which shows the operation of the wireless communication apparatus which concerns on this invention.

Hereinafter, an embodiment of the wireless communication device 100 according to the present invention will be described with reference to the drawings. In the following description, an inner diameter measurement using a bore gauge (inner diameter measuring sensor) 120 attached to a machining center, which is one of the machine tools 10, will be described as an example. However, in the present invention, the machine tool 10 is described. It is not limited to machining centers, but can also be applied to compound lathes and the like. Further, the gauge 120 of the wireless communication device 100 is described by taking an inner diameter measuring sensor as an example, but the gauge 120 is not limited to the inner diameter measuring sensor, but various length measuring instruments including an electric micrometer and an optical scale, and position detection. It can be applied to sensors such as probes, temperature sensors, vibration sensors, pressure sensors, pressure sensors, and humidity sensors. Further, the present invention is suitable for a battery 131, particularly a gauge 120 using a small JIS standard battery because wiring to a commercial power source is difficult, and a typical battery 131 is an easily available alkaline AA battery. Yes, and is intended to reduce the frequency of replacement.

FIG. 1 is a front view schematically showing a machining center 10 as an example of a machine tool in order to clarify its function. In the machining center 10, a shank portion 18a (not shown in FIG. 1) to which tools such as a drill for machining and an end mill are attached to the tip of the spindle housing 15 constituting the spindle, and the machining contents are checked after machining. Therefore, an automatic tool switching unit 30 is provided which can automatically replace the shank portion 18a (see FIG. 2a) to which the measuring probe or the gauge 120 is attached (hereinafter collectively referred to as the tool 18).

The machining center 10 is roughly divided into a machining / measuring section 20, a tool changing section 30, a machining / measuring tool mounting section 40, and a control device 11 for controlling each section. The processing / measuring unit 20 mounts the work W to be processed on the bed 27 as a base member having protrusions extending in the longitudinal direction and placed on the bed 27 in order to move the work W in a horizontal XY plane. It is provided with a saddle 25 having a protrusion formed in a direction perpendicular to the longitudinal direction on the upper surface thereof, and a table 24 which is placed on the saddle 25 and holds the work W in a fixed manner.

The processing / measuring tool mounting portion 40 has a column 12 forming a vertically extending plane and a spindle head 14 mounted on the vertically extending plane as main components, and the spindle head 14 has a spindle not shown vertically. It is formed, and a spindle housing 15 is provided on the lower end side of the spindle. A tool 18 made of a shank to which a processing tool and a gauge 120 are attached can be fitted to the lower portion of the spindle housing 15. A driving means 13 for rotationally driving the spindle is attached to the upper end of the spindle head 14. The spindle head 14 can move in the vertical direction (Z direction) along the column 12.

The automatic tool changing unit 30 takes out a tool 18 made of a general-purpose shank provided with a measuring probe or a gauge 120 into a tool magazine 21 together with a tool 18 made of a general-purpose shank to which processing tools such as various drills and end mills are attached. Holds possible. In this embodiment, the tool 18 is vertically inserted from above into a plurality of tool pots 21a opened at intervals in the circumferential direction on the outer peripheral portion of the tool magazine 21 made of a horizontal disk. The tool magazine 21 is fixed to the rotary table 22 which can be rotated via the support column 22b. The rotary table 22 is placed on the table 23, and the table 23 can move in the X direction on the bed 27a integrated with the bed 27 of the processing / measuring unit 20.

Therefore, when the tool 18 is replaced, the table 22 is moved to a predetermined position in the X direction on the beds 27a and 27, and then the rotary table 22 is rotated by a predetermined angle. Then, the used tool 18 is removed from the spindle housing 15 and then placed in an empty tool pot 21a. Further, the rotary table 22 is rotated by a predetermined angle to grab the predetermined tool 18 from the tool pot 21a and to grab the predetermined tool 18 from the spindle housing. Attach to 15. In the machining center 10, these operations are automatically executed by a program provided in the control device 11 in advance, so that automatic tool exchange becomes possible.

In the above embodiment, the rotary table 22, the beds 27, 27a and the table 22 that can move on the X-axis are combined to replace the tool 18, but this is only an example, and the tool 18 can be transported by a chain or the tool 18 can be transported. There are various methods such as moving the spindle portion including the spindle head 14 to the automatic replacement position. In any case, a method that can reduce the time required for replacement is desirable.

Next, FIG. 2 shows an outline of the wireless communication device 100 according to the present invention. FIG. 2A is a partial cross-sectional front view of a tool 18 incorporating a gauge 120 which is a measuring means of the wireless communication device 100. FIG. 2B is a block diagram of the wireless communication device 100. The tool 18 has a general-purpose shank portion 18a on the upper end side so that it can be attached to the spindle housing 15 of the machine tool 10. Below the shank portion 18a, a gauge 120 integrated with the shank portion 18a or attached to the shank portion 18a is provided. In this embodiment, the gauge 120 is a bore gauge used for inspection after processing the inner diameter.

The wireless communication device 100 is composed of a communication base station 110 built in the control device 11 of the machine tool 10 or arranged in a remote control room of the machine tool 10, and a gauge 120 that wirelessly communicates with the communication base station 110. It is composed. As shown in FIG. 2B, the communication base station 110 includes a transmit / receive transmitter / receiver (hereinafter referred to as a receiver) 112, and transmits a command signal to the gauge 120 via the antenna means 115 attached to the receiver 112. At the same time, a data signal is received from the gauge 120. A display 113 and a communication bus 114 are connected to the receiver 112 via an interface (I / F) 111. Bus 114 uses industrial networks such as RS232C, Ethernet®, I / O contacts (signal exchange), CCLink, Profibus, and Devichenet. The display 113 is used to display data or the like transmitted from the gauge 120.

The gauge 120 communicates with the communication base station 110 via the antenna means 125, and includes a communication unit 123 arranged immediately below the shank unit 18a of the tool. The gauge 120 is provided at the tip of the gauge, and also includes a measuring unit 124 that measures and detects the inner diameter of the work W. The communication unit 123 and the measurement unit 124 are arranged in parallel on the circuit and are connected to the power supply unit 130 via switches 122 and 134. An acceleration sensor 133 whose function will be described later is connected to the switch 134. The power supply unit 130 is arranged between the communication unit 123 and the measurement unit 124 of the tool 18, has a power supply circuit 132 that controls on / off of switches 122 and 134, and the power supply circuit 132 is connected to the battery 131. ing. As mentioned above, the battery is an AA alkaline battery.

The operation of the wireless communication device 100 of the present invention configured in this way will be described with reference to the time chart and the flow chart shown in FIGS. 3A to 5. 3A and 3B show the operation of the machine tool 10 (FIG. 3A (a)), the operation of the machine tool 10, the receiver 112, and the gauge 120 (FIG. 3A (b)), the operation of the gauge 120, and the output current of each part thereof. It is a figure (FIG. 3B) showing. In these figures, Hi indicates that the items described in the leftmost column are in the state (in operation), and Lo indicates that the items described in the leftmost column are not made (in operation). Show that. Further, the horizontal axis of FIGS. 3B (a) and (b) shows the same time lapse. The time t ₀ on the horizontal axis indicates the operation reference time of the wireless communication device 100, and t ₁ to t ₂₃ indicate the switching timing at which a change occurs in some event.

Machine tool processing is performed until the machine tool 10 actually starts processing and processing is completed, and machine tool measurement and machine tool measurement are performed from the start of measurement using the machine tool 10 to the end of measurement. The process from the end to the start of the next machining is called the machine tool standby. If the next machining is started immediately after the measurement is completed, there is no waiting for the machine tool.
FIG. 3A (a) is a diagram showing changes in each event when shifting from machine tool processing to machine tool measurement. In this figure, events ( ₁ ) work transfer to (4) gauge activation occur, and changes corresponding to these events occur in t1 to _t11 . At that time, the gauge 120 is in the sleep mode described later, and only the power supply unit 130 is energized.

The details are such that the work W is conveyed to the spindle position during the time t ₁ to t ₂ for machining ((1) workpiece transfer). Next, for machining, the machining tools (drill A, drill B) are set at times t ₃ to t ₄ , t ₅ to t ₆ ((2) tool replacement), and the times t ₄ to t ₅ , t ₆ to t. Process to ₇ ((3) processing). As shown in the figure, two types of tools are used, and the work is set to the same position during both operations.

Now that the machining is completed, the machine tool 10 moves from the operation of the machine tool to the measurement of the machine tool, and the inspection after the machining is executed. At time t8, the tool ₁₈ is automatically replaced using the tool replacement unit 30. That is, the drill B is replaced with the bore gauge 120 by the time t9 (( ₂ ) tool replacement). _At t9 when the replacement of the tool 18 is completed, communication between the gauge 120 attached to the spindle housing 15 and the communication base station 110 built in the control device 11 of the machine tool 10 is started. First, in order to enable communication between the two, the gauge 120 is ready to be used by waiting for the interrupt output of the accelerometer 133 at the time t ₁₀ between the times t ₉ and t ₁₁ . That is, the acceleration sensor 133 detects the acceleration applied to the gauge 120, and the output thereof makes the gauge 120 usable. (See FIG. 3A (b) (11) Event of acceleration sensor detection signal output). As a result, the gauge mode shifts from the sleep mode to the standby mode ((4) gauge activation operation). The above is the pre-processing and measurement stage mainly for machine tools.

Next, moving to FIG. 3A (b), after the time _t9 when the setting of the gauge 120 is completed, the events from (5) gauge movement to (16) power supply unit occur. Among them, the events (8) to (10) are related to the receiver 112, and the events (11) to (16) are related to the gauge.

After attaching the gauge 120 to the spindle housing 15, when the gauge 120 is moved to measure the inner diameter using the gauge 120, the acceleration sensor 133 built in the power supply unit 130 of the gauge 120 detects the acceleration and the detection signal ( Accelerometer signal) is output. This output signal is switched on mechanically or electrically for a predetermined time (t ₁₀ to t ₁₂ ).

When an acceleration signal is generated by the gauge 120, the gauge 120 outputs a signal synchronized with the receiver 112 to establish communication in order to enable transmission of commands and data between the receiver 112 of the communication base station 110 and the gauge 120. ((12) Synchronous establishment). Once the communication is established, the communication is established until the time t ₂₃ when the measurement program preset in the control device 11 of the machine tool 10 ends, unless there is a disturbance.

Next, the gauge 120 is moved to the measurement position of the work W. This movement includes the work of abutting or approaching the gauge 120 to the work W. _In the gauge movement of the event (5), the gauge 120 is moved to the work W during the time t13 to _t14 , and the measurement ready state is set.
_At the measurement ready time t14, the execution of the measurement program preset in the control device 11 of the machine tool 10 and the transmission request of the data obtained in response to the execution of the measurement are transmitted to the receiver 112. The machine tool 10 continues the measurement until the time t ₂₄ when the operating state continues to be the measurement of the machine tool. These requests are sent with a header ((6) Communication establishment). Further, these requests are transmitted from the receiver 112 to the gauge 120 ((8) measurement instruction). This measurement instruction continues while the data transmission from the gauge 120 to the receiver 112 continues, that is, during the time _t15 to _t19 .

When the measurement instruction signal from the receiver 112 is received at time t16 (( ₁₃ ) measurement instruction reception), the gauge 120 shifts from the standby mode up to that point to the measurement mode. Then, the gauge 120 automatically starts the measurement based on the measurement procedure programmed in the machine tool 10, and transmits the measurement data to the receiver 112 according to the transmission data format specified by the measurement instruction signal ((14) data transmission. ). The reception of the measurement instruction for the event (13) and the data transmission for the event (14) continue until the time _t19 when the actual measurement ends.

The measurement data transmitted from the gauge 120 is received by the receiver 112 for the first time at time _t18 , and then intermittently or continuously until the time _t19 when the actual measurement ends. _At time t19, when all pre-programmed measurements on the machine tool 10 have been completed, the gauge 120 again transitions to standby mode. When the gauge 120 enters the standby mode, the machine tool 10 generates a sleep signal during the time t ₂₀ to t ₂₁ ((7) sleep signal) and via the receiver 112 during the time t ₂₁ to t ₂₂ (((7) sleep signal). 10) Sleep signal), a sleep signal is transmitted to the gauge 120. The gauge 120 receives the sleep signal during the time t ₂₂ to t ₂₃ ((15) sleep signal), and at the time t ₂₄ , shifts the operating state of the machine tool 10 from the measurement of the machine tool to the standby of the machine tool. In this machine tool standby, the tool 18 needs to be automatically replaced in order to machine the next work W or different parts of the same work W, so that the tool 18 is returned to the initial position. At the same time that the state of the machine tool 10 becomes the machine tool standby, the gauge 120 shifts from the standby mode to the sleep mode. During the above series of events, the power supply unit 130 of the gauge 120 is always in an operating state ((16) power supply unit).

The outline of communication between the machine tool 10 and the receiver 112 and the gauge 120 as the communication base station 110 provided therein is as described above, but in the gauge 120 of the present invention, the battery that supplies electric power to each part during that time is used. Energization to each part is selectively stopped in order to suppress wear. This detail will be described with reference to FIG. 3B. FIG. 3B (a) is a diagram showing the movable and non-operating states of the power supply unit 130, the communication unit 123, and the measurement unit 124 of the main unit constituting the gauge 120, in accordance with the time chart shown in FIG. 3A. The power supply unit 130 in the uppermost stage is always in operation, and the communication unit 123 in the middle stage is in operation for a period of time when the state of the machine tool 10 is in the measurement of the machine tool, and is in operation in the machining of the machine tool and the standby state of the machine tool. do not do. Further, the measuring unit 124 operates for a shorter time than the time during the measurement state in which the communication unit 123 operates, and does not operate in the processing of the machine tool and the standby of the machine tool like the communication unit 123.

On the other hand, FIG. 3B (b) is a diagram showing an output current state of each part of the receiver 112 corresponding to FIG. 3B (a). In FIG. 3B (a), since the power supply unit 130 is always in the operating state, its output current is constantly flowing, but since it is a value obtained by adding the current consumption of the communication unit 123 and the measuring unit 124, the measuring unit 124 is operating. When the state of the gauge 120 inside is in the measurement mode, the consumption amount becomes extremely large. On the other hand, when the measuring unit 124 is not operating, even if the communication unit 123 is in the standby mode during communication, its current consumption is smaller than that during the operation of the measuring unit. When the communication unit 123 is not in operation, the switches 134 and 122 are switched to stop energization of the communication unit 123 in addition to the measurement unit 124. This state is called the sleep mode of the gauge 120.

Conventionally, as shown by cross-hatching in the figure, since the measuring unit 124 is energized even when the measuring unit 124 is not measuring, the current consumption is large as a whole. In the present invention, the power consumption of the cross-hatched portion is suppressed, the battery life is extended, and the battery replacement frequency is reduced. _{IPSmax is the maximum output current (current consumption) of the power supply unit, ICOMmax is} the maximum output current (current consumption) of the communication unit, and _IMSmax is the maximum output current (current consumption) of the measurement unit. ..

FIG. 4 shows a flow chart of machining using the machining center 10 and measurement after machining. When machining and inspection of the work are instructed according to the program stored in advance in the control device 11 of the machining center 10, the work W is first arranged on the table 23 in step S410, and the machining position below the spindle is set. Is set to. The process proceeds to the machining step S412 according to the program stored in the machining center 10, and the tool 18 is automatically replaced with the tool 18 according to the machining content by using the automatic tool switching unit 30. Then, it is processed into a predetermined shape in step S414.

After the work W has been machined, the process proceeds to step S416 to perform measurement of the machined portion. The measurement will be described in detail in FIG. If there are a plurality of measurement points, the measurement is continued until the measurement is completed (step S418). As for the measurement, the measurement position, the number of times, and the like are determined in advance by the program, so this judgment is usually unnecessary. When the measurement is completed, the process proceeds to step S420. Next, in order to move to the processing and measurement of the next work W, the work W is transferred to the next process, and a series of automatic processing and measurement is completed (step S422). If the program stored in the machining center 10 instructs other than waiting after measurement or transporting such as machining, the process proceeds to step S424 of the waiting routine in step S420 after the measurement end step S418. After that, the machining center 10 is restarted by an interrupt signal or the like, and branches to each routine of termination (step S426), measurement (step S416), and machining (step S412) according to the program.

Next, FIG. 5 shows the details of the work measurement shown in step S416 of FIG. FIG. 5A is a diagram mainly for explaining the operation of the receiver 112, and FIG. 5B is a diagram mainly for explaining the operation of the gauge 120. When the machining center 10 is in the state of measuring the machine tool, in step S510, the tool 18 attached to the spindle housing 15 is replaced with the tool 18 with the gauge 120. Next, the gauge 120 is used by the accelerometer 133 of the power supply unit 130 so that wireless communication, here, spectrum diffusion communication such as Bluetooth (registered trademark), is established between the gauge 120 and the receiver 112 built in the control device 11. Start up (step S512). After that, in step S514, the machine tool 10 moves the gauge 120 to the measurement position of the work W according to the program incorporated in the control device 11. In step S516, the receiver 112 requests the gauge 120 to send measurement instructions and data in a predetermined format. The receiver 112 receives the measurement data wirelessly transmitted from the gauge 120 in step S518. After a series of data transmission / reception is completed, the receiver 112 transmits a measurement end command signal to the gauge 120 in step S520. Next, it is confirmed in step S522 whether there is another measurement, and if there is, the process returns to step S514, and steps S514 to S520 are repeated. If not, the process proceeds to step S524, and when the measurement instruction signal is stopped, the energization of the measurement unit 124 is stopped. Then, the energization of the communication unit 123 is stopped by the sleep signal.

On the other hand, on the gauge 120 side, when the state of the machine tool 10 is the measurement of the machine tool, the operation of the acceleration sensor 133 is waited in step S530, and when the acceleration sensor 133 operates, the switch 134 is turned on to energize the communication unit 123. Then, the process shifts to the standby mode of the gauge 120 (step S532). The state of the gauge 120 up to that point is the sleep mode. Then, in step S534, the gauge 120 and the receiver 112 are synchronized to establish communication. In step S536, it waits for the measurement command and the data transmission request from the receiver 112 to be received, and as soon as it is received, the switch 122 is turned on in step S538 to energize the measurement unit 124, and the gauge 120 is moved from the standby mode to the measurement mode. .. Since the gauge 120 has moved to the measurement mode, the measurement is executed according to the program stored in the control device 11 (step S540), and the measurement data is transmitted in the format defined in the receiver 112 (step S542). The process proceeds to step S544, and it is confirmed whether the measurement signal is being received from the receiver 112. If it is being received, the process returns to step S540 and steps S540 to S542 are repeated. When the reception is completed, the process proceeds to step S546, the switch 122 is turned off, the energization of the measuring unit 124 is stopped, and the gauge 120 is put into the standby mode. After that, it waits for the sleep signal to be transmitted from the receiver 112 (step S548), and when the sleep signal is sent, the switch 134 is turned off to de-energize the communication unit 123, and the gauge 120 is moved to the sleep mode (step S550). ).

As described above, according to the present invention, when wireless communication is performed between the gauge provided in the receiver provided in the control device on the main body side of the machine tool and the tool attached to the tip of the spindle of the machine tool, the gauge is based on the gauge. A measurement mode in which not only the communication unit but also the measurement unit is energized during measurement, a standby mode in which the measurement unit is energized but the communication unit is energized and communication is possible, and only the power supply unit is energized. Since it has a sleep mode, power consumption when only communication is executed is suppressed, and the life of a gauge that is remotely installed and cannot use commercial power and is supplied only from a battery can be extended. Therefore, it is possible to reduce the inconvenience of battery replacement in an automatic machine such as a machining center that automatically replaces tools.

Although the above embodiment has been described by taking a vertical machining center as an example, it goes without saying that it can also be applied to a horizontal type or a gate type. Further, it can be easily imagined that the movement of the work or the tool is not limited to the above embodiment, and the automatic tool replacement method is not limited to the above embodiment. In short, in the present invention, since the tool is attached to the tip of the machine tool, data transmission must be performed wirelessly, and the power supplied to the gauge on the sensor side must be a battery. It provides a method and an apparatus which can reduce the amount of power consumption.

10 ... Machine tool (machining center), 11 ... Control device, 12 ... Column, 13 ... (Rotation) drive means, 14 ... Main shaft head, 15 ... Main shaft housing, 18 ... Tool, 18a ... Shank part, 20 ... Machining ... Measuring unit, 21 ... Tool magazine, 21a ... Tool pot, 22 ... (Rotary) table, 22b ... Support, 23, 24 ... Table, 25 ... Saddle, 27, 27a ... Bed, 30 ... Tool replacement unit, 40 ... Machining -Measuring tool mounting part, 100 ... wireless communication device, 110 ... communication base station, 111 ... interface (I / F), 112 ... (transmitter) receiver, 113 ... display, 114 ... bus, 115 ... antenna means, 120 ... Gauge (measuring tool), 122 ... switch, 123 ... communication unit, 124 ... measurement unit, 125 ... antenna means, 130 ... power supply unit, 131 ... battery, 132 ... power supply circuit, 133 ... acceleration sensor, 134 ... switch, Hi ... Operating, Lo ... Not operating, t ₁ to t ₂₄ ... Switching timing

Claims (6)

A wireless communication device that wirelessly communicates between a base station and a gauge having a battery arranged in a machine tool.
An energizing means provided in at least the gauge and energizing from the battery to a communication unit that communicates with the base station when the gauge detects vibration or displacement of a predetermined magnitude or more.
At the same time or after that, the measuring unit that measures a predetermined physical quantity with a stylus attached to the machine tool is energized to shift to the measurement mode.
After the measurement of the gauge is completed, in order to communicate between the base station and the communication unit, only the communication unit is energized and the measurement unit is de-energized to shift to the standby mode. Device. After the measurement by the measuring unit is completed or before the measurement, the communication unit has a sleep mode in which both the communication unit and the measuring unit and the battery are de-energized when the communication is completed. The wireless communication device according to claim 1. The machine tool is either an automated tool replaceable machining center or a compound lathe, and the gauge is at least one of a length gauge, a position sensor, a temperature sensor, a vibration sensor, a pressure sensor, and a humidity sensor. The wireless communication device according to claim 1 or 2. In a method of reducing power consumption in a wireless communication device that wirelessly communicates between a base station and a gauge having a battery arranged in a machine tool.
When the gauge detects vibration or displacement of a predetermined magnitude or more, the starting means is activated to energize at least the communication unit provided in the gauge and communicating with the base station from the battery.
At the same time or after that, the measuring unit that measures a predetermined physical quantity with a stylus attached to the machine tool is energized to shift to the measurement mode.
After the measurement of the gauge is completed, in order to communicate between the base station and the communication unit, only the communication unit is energized and the measurement unit is de-energized to shift to the standby mode. How to reduce power consumption in equipment. After the measurement by the measuring unit is completed or before the measurement, the communication unit has a sleep mode in which both the communication unit and the measuring unit and the battery are de-energized when the communication is completed. The method for reducing power consumption in the wireless communication device according to claim 4. The machine tool is either an automated tool replaceable machining center or a compound lathe, and the gauge is at least one of a length gauge, a position sensor, a temperature sensor, a vibration sensor, a pressure sensor, and a humidity sensor. The method for reducing power consumption in the wireless communication device according to claim 4 or 5.

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