JP2008221358A - Radio device for detecting workpiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect the clamped state of a workpiece without using an air pipe and a signal cable. <P>SOLUTION: In this radio device for detecting a workpiece, a radio proximity sensor detecting the position of the workpiece in the state of noncontact with each other, and transmitting, by radio, a signal related to the detection, is disposed on the rotation side thereof disposed on a machining device and integrally rotated with the work during the machining. A receiving antenna receiving the signal by radio is disposed on the non-rotating portion of the machining device at a position in proximity to the radio proximity sensor. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The wireless device for workpiece detection according to the present invention is a device that can wirelessly transmit and receive a signal that detects whether the workpiece is placed at a predetermined position.

  The apparatus of the present invention can be applied to a machining apparatus or the like that processes the workpiece by numerically controlling the machining tool in accordance with the machining reference position as the machining reference position of the workpiece.

  Further, the apparatus of the present invention can be applied to a workpiece clamping device or the like that is disposed in a machining apparatus that performs machining while rotating a workpiece, and clamps the workpiece at a required position.

  When a workpiece is processed by a machining device such as a grinding or cutting machine, it is necessary to clamp the workpiece at a position that conforms to the machining standard of the machining device. A workpiece clamping device is used for the clamping.

  If the reciprocating engine for automobiles is taken as an example, the workpiece to be processed includes various parts such as a cam of a cam shaft, its journal, a piston pin, a crank journal, and a crank pin. There has been proposed a machining apparatus for controlling the grinding of such a workpiece according to numerical data or a program. (See Patent Document 1).

  When machining a workpiece using such a machining device, the workpiece clamping device for clamping the workpiece is provided with an air outlet at the seating position of the workpiece, and an air pipe is connected to the air outlet. One end side of the air pipe is connected in communication and the other end side of the air pipe is connected to the air supply source, and air of a predetermined pressure is supplied from the air supply source to the air outlet through the air pipe, and air is supplied from the air outlet. In some cases, the clamping state of the workpiece is determined by detecting whether or not the leakage occurs. (See Patent Document 2).

  However, after machining scraps generated by machining in the machining apparatus adhere to or accumulate on the work clamp device and the workpiece is removed from the workpiece clamp device, the machining scrap is removed from the air outlet through the air piping. It is easy to enter inside and may block the air outlet. Such a possibility increases the machining defect rate of the workpiece. Moreover, the operation | work which cleans the processing waste which has plugged up air piping is requested | required frequently, and work cost becomes high. Furthermore, since it is necessary to route and install the air piping in the work clamp device, the piping cost is high and the maintenance cost for the air piping is also high. Furthermore, since it is necessary to rotate the workpiece clamping device together with the workpiece, air is supplied (on) before machining to detect the seating state of the workpiece, and air supply is stopped (off) during machining. Therefore, on / off control of air supply becomes complicated. Furthermore, if the air supply is turned off during processing, the workpiece to be processed should exist at the normal seating position, but it is actually processed in a clamped position that deviates from the normal seating position. This also increases the machining defect rate of the workpiece.

  Therefore, as a result of diligent research, the present applicant has considered installing a conventional proximity sensor in the work clamp device. The proximity sensor is considered to be able to detect the seating state of the work piece without contacting the work piece.

  However, the conventional general proximity sensor requires a signal wiring in order to output the detection output, and the signal wiring is difficult if the proximity sensor is attached to a work clamp device that rotates together with the workpiece. For example, there is a method in which signal wiring is divided and wired between the work clamp device side and the control side that receives the proximity sensor output and performs servo motor control of the machining device, and the divided signal wires are slid in contact with a slip ring. .

Such a method is not preferable when a large number of machining devices are used, because a large number of signal wirings are routed on the machining device installation floor.
JP 2002-103219 (April 9, 2002) JP 7-40169 (published February 10, 1995)

  Therefore, the applicant has further researched and developed a wireless proximity sensor that can transmit the signal wirelessly, not a proximity sensor that requires signal wiring.

  However, in the case of a wireless proximity sensor, in order to transmit wirelessly without transmitting a signal by signal wiring, even if there are a plurality of wireless proximity sensors within the same machining apparatus, the wireless proximity sensor is wirelessly provided within the plurality of machining apparatuses. Even when proximity sensors are arranged, mutual interference of signal radio waves from each wireless proximity sensor becomes a problem.

  Therefore, the problem to be solved by the present invention is that a clamp state of a workpiece to be processed can be detected without using air piping or signal wiring, and a radio proximity sensor in which mutual interference of the signal radio waves does not occur or hardly occurs, and It is to provide a work clamping device using the wireless proximity sensor.

  The wireless device for workpiece detection according to the present invention detects the position of the workpiece in a non-contact manner on the rotating side that is disposed in the machining device and rotates integrally with the workpiece during machining, and relates to the detection. While a wireless proximity sensor for transmitting a signal by radio wave is disposed, a receiving antenna for receiving the signal by radio wave is disposed at a position close to the wireless proximity sensor in a non-rotating portion of the machining apparatus.

  In a preferred aspect of the present invention, the wireless proximity sensor includes a non-contact detection unit that detects the position of the wireless workpiece without contact with the workpiece, and a processing unit that processes a signal related to the detection into a signal form for radio transmission. And a transmission antenna that transmits the output of the processing unit by radio wave, and these are housed in a sealed housing made of resin.

  One preferable aspect of the present invention is that the transmission antenna is a planar antenna.

  According to a preferred aspect of the present invention, the wireless proximity sensor is disposed in a workpiece clamping device that is disposed in a machining apparatus, fixes the workpiece to a machining reference position, and rotates integrally with the workpiece during machining. And transmitting a signal related to detection of a processing reference position of the workpiece to be processed.

  In a preferred aspect of the present invention, the workpiece clamping device includes a workpiece pedestal on which a workpiece to be processed is installed, and a workpiece clamp that clamps the workpiece on the pedestal surface of the workpiece pedestal. The sensor is housed in a recess provided on the base surface of the work base.

  The non-contact detection unit is not limited to the detection method, and may include an electromagnetic induction method type, a capacitance method, a magnetic method, an ultrasonic method, a photoelectric method, and other detection methods.

  The wireless proximity sensor can include not only a sensor that can continuously detect the position of an object, but also a sensor device that is turned on or off when the object approaches a certain distance.

  The radio wave transmission / reception mode and transmission / reception frequency are not particularly limited.

  In the present invention, the form of supplying power to the non-contact detection unit, the processing unit, etc. is not particularly limited, but for example, a battery mounting chamber is provided in the housing, and the battery mounted in the battery mounting chamber is used to power the wireless transmission unit, etc. It may be possible to omit the wiring of the power cable for supplying power by supplying the power.

  In the wireless device for workpiece detection according to the present invention, when the wireless proximity sensor is incorporated into the machining reference position of the workpiece in the machining device, the workpiece is moved to the machining reference position by the non-contact detection unit of the wireless proximity sensor. Can be detected without touching the workpiece. And after processing the detection output of the non-contact detection part into the form which can be wirelessly transmitted by the process part of a wireless proximity sensor, it can transmit from the transmission antenna of a wireless proximity sensor.

  Therefore, in order to detect the set state of the workpiece to be machined at the machining reference position, an air outlet is provided on the work base as in the prior art, and one end of the air pipe communicating with the air outlet is connected to the work base and the air There is no need to connect an air supply source to the other end of the pipe, and a system for detecting the air pressure state with a pressure sensor disposed in the middle of the air pipe.

  As described above, when the wireless proximity sensor related to the wireless device for detecting a workpiece according to the present invention is incorporated in a machining device, an increase in the processing defect rate of the workpiece by the above-described conventional system, an operation for cleaning machining waste, an air pipe, and the like. It is possible to eliminate the installation and the like.

  In the wireless device for detecting a workpiece to be processed according to the present invention, since the detection output of the non-contact detection unit of the wireless proximity sensor can be transmitted by radio waves, the signal wiring for outputting the detection output is not necessary.

  In the above, in the wireless device for detecting a workpiece to be processed according to the present invention, since the receiving antenna for receiving the signal is received at a position close to the wireless proximity sensor, for example, a plurality of wireless proximity sensors are provided in the same machining device. Even if it exists, it is possible to prevent or make it difficult to cause mutual interference of transmission radio waves.

  The wireless device for workpiece detection of the present invention transmits a signal related to detection of a workpiece by a radio proximity sensor, while receiving a transmission antenna built in the wireless proximity sensor attached to a non-rotating portion of the machining device. Because it is placed close to the antenna, for example, the clamping state of the workpiece can be detected by an inexpensive method without using air piping or signal wiring, and it is related to the detection of the workpiece. It is particularly preferable in a factory where a large number of machining devices are centrally arranged, such as eliminating the need to route signal wiring and output it to a control device or the like.

  Furthermore, in the wireless device for detecting a workpiece to be processed according to the present invention, the transmitting antenna and the receiving antenna are arranged close to each other, so that mutual interference with other radio waves does not occur or occurs, for example, inside the same machining device. Can be difficult.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a schematic configuration of a machining apparatus and a workpiece detecting wireless apparatus according to an embodiment used in the machining apparatus.

  With reference to the figure, in this machining apparatus, a table 2 arranged on a bed (not shown) is arranged to be slidable in the x direction by a moving motor 4.

  Rotating main shafts 6 and 8 are arranged on the table 2 so as to face each other.

  Work clamping devices 10 and 12 are provided so as to protrude from the opposing surfaces of the rotary main shafts 6 and 8.

  The workpiece 14 is a round bar having a long cylindrical surface whose diameter is constant in the x direction. Both ends of the workpiece 14 are clamped by the workpiece clamping devices 10 and 12, respectively, so that the workpiece 14 can rotate integrally with the rotation main shafts 6 and 8 around the axis c1.

  The rotary spindle 6 is driven to rotate by a spindle motor 15.

  The workpiece 14 according to the embodiment is described above for convenience of understanding. However, the workpiece 14 to which the present invention is applied is not limited to the above shape, and the profile of the outer peripheral surface is an eccentric cam shaft. Such as a non-circular shape, a concave-convex shape or a conical shape in the longitudinal direction. For example, cams with camshafts, journals, piston pins, crank journals, crank pins, and the like in a reciprocating engine for an automobile can be applied to the workpiece 14.

  A rotary grindstone 16 that is an example of a processing tool is rotationally driven around an axis c2 by a grindstone motor 21. A grindstone is mounted on the outer peripheral portion of the rotating grindstone 16, and processing such as grinding is performed on the work surface which is the outer peripheral surface of the work 14 by the grindstone.

  The table 20 is driven in the y direction by a motor 18 disposed on the bed (not shown). The rotary grindstone 16 can freely move back and forth in the y direction by the table 20 to process the workpiece 14.

  Wireless proximity sensors 22 and 24 are built in the workpiece clamping devices 10 and 12 at both ends of the workpiece 14, respectively. The wireless proximity sensors 22 and 24 are not necessarily arranged on both shaft end sides of the workpiece 14, and the wireless proximity sensor 22 or 24 may be arranged only on one shaft end side. However, in the case of detecting the clamp position deviation of the workpiece 14, it is necessary to dispose the proximity sensor devices 22 and 24 on both shaft end sides of the workpiece 14.

  Both the wireless proximity sensors 22 and 24 detect the clamp state at the shaft end of the workpiece 14 without contacting the workpiece 14 and wirelessly transmit the respective sensor data related to the detection by a built-in transmission antenna described later. It is configured to transmit to the receivers 26 and 28.

  The workpiece 14 needs to be maintained in a clamped state during machining at a position that matches the machining reference position in the machining device by the workpiece clamping devices 10 and 12.

  Therefore, sensor data indicating whether or not both shaft ends of the workpiece 14 are clamped by the workpiece clamping devices 10 and 12 at a position suitable for the machining reference position is received wirelessly from the wireless proximity sensors 22 and 24 before the machining is started. It is transmitted to the machines 26 and 28.

  The sensor data of the wireless proximity sensors 22 and 24 are not necessarily received by the two wireless receivers 26 and 28, and may be received by one of the wireless receivers 26 and 28.

  This is because, since the transmission ID code is included in the sensor data of each of the wireless proximity sensors 22 and 24, it can be determined which of the wireless proximity sensors 22 and 24 is the sensor data.

  Conventionally, since air supply from the air supply source is stopped during machining, changes in the pressure in the air piping due to air outflow from the air outlet of the work base cannot be detected by the pressure sensor. During the processing on the workpiece 14, the workpiece 14 must be processed on the assumption that the workpiece 14 is clamped at the correct position by the workpiece clamping devices 10 and 12.

  Alternatively, a plurality of air outlets are arranged in the direction in which the workpiece 14 is displaced, and the clamping state of the workpiece 14 is determined from the pressure change in the air piping corresponding to the displacement of the clamping position of the workpiece 14. However, it is impossible to detect a continuous displacement, and since it is necessary to provide a plurality of air outlets, the processing cost of the work base is high.

  On the other hand, in the embodiment, the proximity sensors 22 and 24 need only be built in the work base, and the processing cost of the work base does not increase so much.

  Thus, the sensor data received by both the radio receivers 26 and 28 is input to the control device 30. The control device 30 can be configured by a programmable logic controller (PLC). The control device 30 includes a CPU, a memory, and the like. The CPU drives a drive circuit 32 such as a motor according to a control program stored in the memory while monitoring sensor data from the radio receivers 26 and 28. The machining of the workpiece 14 is controlled.

  This control program is composed of a sequence program, and when performing various types of machining on the workpiece 14, the PLC is not limited to the sensor data from the radio receivers 26 and 28, but various types of sensors, actuators, etc. The input / output device 31 may be connected to perform a sequence control for machining the workpiece 14 in the machining apparatus while executing a sequence program stored in advance.

  Further, for example, machining profile data of the workpiece 14 is stored in the memory, the CPU controls the movement of the tables 2 and 20 in accordance with the machining profile data, performs arbitrary machining on the workpiece 14, The workpiece 14 is machined while detecting whether the workpiece 14 is clamped at the machining reference position of the machining profile based on the sensor data from the wireless proximity sensors 22 and 24 incorporated in the workpiece clamping devices 10 and 12. You may do it.

  The installation of the wireless proximity sensors 22 and 24 in the work clamp devices 10 and 12 will be described with reference to FIG. FIG. 2 shows a cross-sectional configuration taken along line AA of FIG. However, the details of the internal structure of the wireless proximity sensor 22 shown in FIG. 2 are omitted, and the circuit block is schematically shown.

  First, installation of the wireless proximity sensor 22 will be described. The work clamp device 10 includes a work clamp 34 and a work base 36. The work pedestal 36 is provided with a recess 38 for installation of the wireless proximity sensor 22 as a sensor mounting portion. The wireless proximity sensor 22 is housed and installed in the recess 38.

  The wireless proximity sensor 22 has a resin casing 42 whose inside is sealed, and a non-contact detection for detecting the clamped state of the workpiece 14 without contacting the workpiece 14 inside the casing 42. And a signal processing unit 46 that processes the sensor data related to the detection into a data format for wireless transmission, and a transmission antenna 48 that wirelessly transmits the sensor data from the signal processing unit 46. Yes.

  The resin material of the casing 42 is preferably a resin having heat resistance and high strength. Examples of the resin include polyimide, polyamideimide, polyamide, epoxy, and polyester (polyethylene terephthalate and polyethylene naphthalate). Etc.), polysulfone-based, polycarbonate-based, nylon-based, and polybutylene terephthalate (PBT).

  A clamped state of the workpiece 14 on the workpiece base 36 will be described with reference to FIG. FIG. 3A shows a case where the workpiece 14 is clamped by the workpiece clamp 34 with its rotation center point O1 shifted from the installation point O2 on the workpiece pedestal 36 to the left side in the figure, and FIG. The case where it is clamped is shown, and the case where it clamps by shifting to the right side of the figure is shown in FIG.

  FIG. 4 shows the detection level of the non-contact detection unit 44 of the wireless proximity sensor 22 at the workpiece position of the workpiece 14 on the workpiece base 36. In FIG. 4, the horizontal axis represents the workpiece position of the workpiece 14 on the workpiece base 36, and the vertical axis represents the level of the detection signal of the non-contact detection unit 44 of the wireless proximity sensor 22.

  When the workpiece 14 is clamped at the position shown in FIG. 3A, the non-contact detection unit 44 of the wireless proximity sensor 22 outputs sensor data of level a at the detection level shown in FIG. 4), the sensor data of the maximum level b is output at the detection level of FIG. 4, and when it is clamped at the position of FIG. 3C, the level c is detected at the detection level of FIG. Output sensor data.

  Sensor data including data of the above detection levels is transmitted from the transmission antenna 48 of the wireless proximity sensor 22. This sensor data is received by the wireless receiver 26 and input to the control device 30. When the workpiece 14 is displaced from the sensor data at the position shown in FIG. 3A or 3C from the sensor data, for example, the movement amount of the table 20 or Alternatively, the processing speed, processing time, and the like by the rotating grindstone 16 are controlled (servo control, etc.), or the table 2 is controlled to move in the y direction by the moving motor 18 on the table (not shown) on the table. Servo control etc.). As a result, the workpiece 14 can be normally machined by the rotary grindstone 16.

  With reference to FIG. 5, transmission from the transmission antenna 48 of the wireless proximity sensor 22 constituting the workpiece detection wireless device of the embodiment and the reception antenna 26 a of the wireless receiver 26 that receives this transmission radio wave will be described. To do. FIG. 5A is a cross-sectional view corresponding to FIG. 2, and FIG. 5B is a partial cross-sectional view of the main part of the work clamp device 10 on the left side in FIG.

  The transmission antenna 48 of the wireless proximity sensor 22 is a planar antenna.

  The receiving antenna 26a of the wireless receiver 26 is fixedly arranged on the lower surface of the receiving antenna fixing portion 2a that is erected on the workpiece moving table 2, for example, which is a non-rotating part of the machining apparatus. Reference numeral 26b denotes a wiring of the receiving antenna 26a. The receiving antenna fixing portion 2a is not shown in FIG. 1 for convenience of illustration. The facing separation distance between the transmitting antenna 48 and the receiving antenna 26a is set to be extremely short.

  The transmission radio wave TE from the transmission antenna 48 of the wireless proximity sensor 22 is radiated with high directivity toward the reception antenna 26a that is very close to the transmission antenna 48 in terms of distance. Therefore, even if the transmission radio wave TE is transmitted from the transmission antenna 48 of the wireless proximity sensor 22 with low power, the reception radio wave TE can be received by the reception antenna 26a. At the same time, the transmission radio wave TE is weak, so The other receiving antennas arranged do not receive the transmission radio wave and do not cause mutual interference of radio waves.

  As a result, power consumption required for transmission by the wireless proximity sensor 22 can be reduced, and radio waves do not interfere with each other, so that no adverse effects are exerted on surrounding machining devices, other devices, machines, and the like. Therefore, it is preferable.

  Although not shown, the radio proximity sensor 22 and the receiving antenna 26a are arranged around a radio wave shielding structure to more effectively block or suppress mutual interference with transmission radio waves from other radio proximity sensors. It may be.

  The configuration of the wireless proximity sensor 22 will be described in more detail with reference to FIG. The case 42 of the wireless proximity sensor 22 has a cylindrical shape as an example, and a cup-shaped cap 50 is attached to one end side opening thereof, and a ferrite core 52 is disposed in the cap 50. A detection coil 54 is wound around the ferrite core 52. These can constitute a sensor head of the wireless proximity sensor 22. When the workpiece 14 is present in the vicinity of the detection coil 54, the resistance component and the inductance component of the detection coil 54 change due to the electromagnetic induction action between the detection coil 54 and the workpiece 14 (the Q value of the detection coil 54 changes). To do. Thereby, a detection coil comprises a part of non-contact detection part. A substrate 56 is disposed on the opening side of the cap 50. A circuit component 58 is mounted on the back side of the substrate 56. The substrate 56 is supported by the back side of the ferrite core 52 and the interior support substrate 60.

  A transmission antenna 48 is formed in a loop antenna shape on the flat surface of the substrate 56 as shown in FIG. The arrangement position of the transmission antenna 48 is not particularly limited. When the transmission antenna 48 is arranged in the recess 38, it may be arranged at a position convenient for efficiently radiating the transmission radio wave TE toward the reception antenna 26a. preferable. Therefore, a dedicated antenna installation board may be provided separately from the board 56, and the orientation of the board surface on which the loop antenna is formed of this dedicated board may be adjusted.

  The inner peripheral surface of the other end side of the housing 42 is a battery mounting chamber 64, and various batteries 66 such as a primary battery and a secondary battery can be mounted in the battery mounting chamber 64. When power is supplied from the work clamp device 10, the battery mounting chamber 64 need not be provided.

  The other end side of the housing 42 is opened, and this opening is closed by a screw-in cap 68. A spring 70 that provides a contact point for the battery 66 is provided on the inner surface of the cap 68. The battery 66 is replaceable, and by tightening the cap 68, both the positive and negative contacts are connected to the power supply line for the circuit components 58 constituting the non-contact detection unit 44 and the signal processing unit 46. Battery power can be supplied to the circuit component 58.

  The housing 42 has a structure in which the inside thereof is hermetically sealed while the opening is closed by a cap 68. In this case, an unillustrated O-ring may be attached to the cap 68. The inside of the housing 42 is preferably filled with a resin for anti-coolant (cooling water).

  The circuit configuration of the wireless proximity sensor 22 will be described with reference to FIG. The wireless proximity sensor 22 includes the non-contact detection unit 44, the signal processing unit 46, and the transmission antenna 48 as circuits. The non-contact detection unit 44 and the signal processing unit 46 are supplied with battery 66 power.

  The non-contact detection unit 44 includes the detection coil 54, the oscillation unit 72, the detection unit 74, and the output unit 76 described above. In the oscillation unit 72, the oscillation amplitude and the oscillation frequency are changed by the change of the Q of the detection coil. In the high-frequency type, the oscillation amplitude of the oscillation unit 72 can be detected by the detection unit 74, and the presence and proximity of the workpiece 14 can be detected according to the detection output of the detection unit 74. Sensor data as a result of this detection is output from the output unit 76 to the signal processing unit 46.

  The signal processing unit 46 includes a CPU 78 for calculating sensor data and other controls, a RAM 80 for storing ID codes and other data for identifying other wireless proximity sensors, and a ROM 82 for storing control programs. And the sensor data (transmission frequency (carrier), ID code (identification code), detection output of the non-contact detection unit 44) from the microcomputer 84, and the ID code and the detection output by the carrier. And a transmission output unit 86 that generates and outputs a transmission signal by modulation.

  Sensor data from the signal processing unit 46 is radiated in the form of radio waves from a transmission antenna 48 having a loop antenna shape to the air. In this case, since the housing 42 is made of resin, this radio wave can be radiated out of the housing 42.

  Note that the CPU 78 of the signal processing unit 46 transmits one-shot wireless communication for 0.5 seconds when sensor data is input from the non-contact detection unit 44 in order to extend the life of the battery 66. In the (stop mode), consumption of the battery 66 is suppressed.

  Note that the workpiece 14 may have a disk shape or a short cylindrical shape in which one end side is clamped as shown in FIG. 9, for example. For example, a cast aluminum alloy wheel or the like may be used. In such a workpiece 14, both ends thereof are not clamped by the workpiece clamping devices 10 and 12, and one end side is clamped by the workpiece clamp 34 and the workpiece base 36 of the workpiece clamping device 10 as shown in the drawing, and the axis around the axis c <b> 4 in the drawing is obtained. While the workpiece 14 is rotated in the y direction, the workpiece 14 is moved and controlled in the y direction, while the workpiece 14 is rotated by the rotating grindstone 16 that rotates around the axis c3 in the drawing and is movable in the x direction. . In this case, the wireless proximity sensor 22 is preferably incorporated in a recess 38 that is a sensor mounting portion of the work base 36.

  As described above, in the present embodiment, when the wireless proximity sensor 22 is incorporated in the work clamping device 10, the workpiece 14 is clamped by the non-contact detection unit 44 inside the housing 42 of the wireless proximity sensor 22. The state can be detected without contacting the workpiece 14. The sensor data related to the detection can be transmitted from the transmission antenna 48 of the wireless proximity sensor 22 after being processed into a form that can be wirelessly transmitted by the signal processing unit 46 of the wireless proximity sensor 22. Therefore, the workpiece 14 is clamped in a conventional manner with an air outlet provided on the work base, and one end of the air pipe communicating with the air outlet is provided on the work base and an air supply source is provided on the other end of the air pipe. There is no need to connect a system that detects the air pressure state with a pressure sensor arranged in the middle of the air piping.

  From the above, when the wireless proximity sensor of the embodiment is incorporated in the work clamp device, the work defect rate of the work to be processed by the conventional system, the cleaning work of the processing waste, the installation of the air piping, etc. are eliminated. be able to.

  Further, since the wireless proximity sensor of the present invention can transmit sensor data wirelessly, signal wiring for outputting sensor data is not necessary.

  The present invention is not limited to the above-described embodiments, and includes various changes or modifications within the scope described in the claims.

FIG. 1 is a diagram showing a schematic configuration of a machining apparatus according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a diagram showing a workpiece position shift of the workpiece workpiece clamp with respect to the workpiece base. FIG. 4 is a diagram showing the detection level from the wireless proximity sensor at the workpiece position of the workpiece to be processed on the workpiece base. FIG. 5A corresponds to FIG. 2 and is a cross-sectional view showing transmission and reception of radio waves between the transmission antenna and the reception antenna. FIG. 5B shows the work clamp device 10 on the left side of FIG. It is a fragmentary sectional view of the principal part seen from the direction. FIG. 6 is a cross-sectional view showing the configuration of the wireless proximity sensor shown in FIG. FIG. 7 is a diagram showing a configuration of a loop antenna provided in the wireless proximity sensor of FIG. FIG. 8 is a diagram showing a schematic electrical configuration of the wireless proximity sensor. FIG. 9 is a diagram showing another example of the machining apparatus.

Explanation of symbols

2 Table 4 Moving motor 6, 8 Spindle 10, 12 Work clamp device 15 Spindle motor 16 Rotary grindstone 21 Grinding wheel motor 20 Table 22, 24 Wireless proximity sensor 26, 28 Wireless receiver 30 Controller 32 Drive circuit 42 Housing 44 Non-contact Detector 46 Signal processor 48 Transmitting antenna

Claims (5)

A wireless proximity sensor that detects the position of the work piece in a non-contact manner and transmits a signal related to the detection on the rotating side that is disposed in the machining apparatus and rotates integrally with the work piece during machining. ,
A radio apparatus for detecting a workpiece to be processed, characterized in that a receiving antenna for receiving the signal is received at a position close to the radio proximity sensor in a non-rotating portion of the machining apparatus.   The wireless proximity sensor includes a non-contact detection unit that detects a position of the workpiece without contact, a processing unit that processes a signal related to the detection into a signal form that transmits the radio wave, and an output of the processing unit that transmits the radio wave. 2. The wireless device for detecting a workpiece to be processed according to claim 1, further comprising: a transmitting antenna that is housed in a sealed housing made of resin.   3. The workpiece detecting wireless device according to claim 2, wherein the transmitting antenna is a planar antenna.   The wireless proximity sensor is disposed in a workpiece clamping device that is disposed in a machining device, fixes the workpiece to a machining reference position, and rotates integrally with the workpiece during machining. The workpiece detection wireless device according to any one of claims 1 to 3, wherein a signal related to detection is transmitted by radio waves. The workpiece clamping device includes a workpiece pedestal on which a workpiece to be processed is installed, and a workpiece clamp that clamps the workpiece on the pedestal surface of the workpiece pedestal,
The wireless device for workpiece detection according to claim 4, wherein the wireless proximity sensor is housed in a recess provided on a pedestal surface of the workpiece pedestal.

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