Non-contact power supply device

Abstract

A non-contact power supply device 400 which supplies power to a tool holder 200 in a non-contact manner comprises: a first device 500 that has a magnetic field generation unit; and a second device 600 that has a power generation unit. The second device 600 is attached to the tool holder 200. When power is supplied to the tool holder 200, the first device 500 which is held by a holding member 730 of a holding device 700 is moved from the holding member 730-side toward a holding member 171 which is provided to a main shaft housing 160. When there is no need to supply power to the tool holder 200, the first device 500 which is held by the holding member 171 is moved from the holding member 171-side to the holding member 730-side.

Description

Non-contact power supply device

[0001] The present disclosure relates to a non-contact power supply device that supplies power to a tool holder attached to the spindle of a machine tool in a non-contact manner.

[0002] In a machine tool that processes a workpiece using a tool, a tool holder (referred to as a "tool holder") that holds the tool is used. The tool holder is attached to the spindle (referred to as a "spindle") and rotates together with the spindle. As the tool holder, a tool holder with an actuator, an electronic circuit, etc. built therein may be used. For example, when performing boring using a boring tool, a tool holder with an actuator built therein that adjusts the position of the cutting edge of the boring tool as the cutting edge of the boring tool wears may be used. When using such a tool holder with an actuator built therein, a non-contact power supply device for supplying power to the tool holder in a non-contact manner to drive the actuator is used.

[0003] Conventionally, a non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 2017-56554 is known. The non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 2017-56554 is composed of a first device that is attached to a spindle housing that rotatably holds the spindle and has a power transmission coil, and a second device that is attached to the tool holder and has a power reception coil. In the non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 2017-56554, when the power reception coil rotates together with the tool holder, power is supplied from the power transmission coil to the power reception coil by electromagnetic induction.

[0004] Japanese Patent Application Laid-Open No. 2017-56554

[0005] In the non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 2017-56554, the first device is attached to the spindle housing by a fixing device. Therefore, the attachment and detachment work of the first device when replacing the first device, etc. is troublesome and takes time. Also, since the first device is attached to the spindle housing, the first device may interfere with other operations. Therefore, an object of the present disclosure is to provide a non-contact power supply device that can attach and detach the first device to and from the spindle housing quickly and easily.

[0006] This disclosure relates to a non-contact power supply device that supplies power to a tool holder that rotates with a spindle rotatably supported in a main body. The non-contact power supply device of this disclosure comprises a first device, a second device, a holding device, and a drive device. The first device has a magnetic field generating unit. Various configurations of magnetic field generating units can be used, such as a magnetic field generating unit that generates a magnetic field using a permanent magnet or a magnetic field generating unit that generates a magnetic field using a coil. The second device has a power generating unit. The second device is attached to the tool holder. Various configurations of power generating units can be used, which can generate power by the second device rotating with the tool holder while the first device is held in the spindle housing. The holding device has a first holding unit that detachably holds the first device. Various configurations of holding units that can detachably hold the first device can be used as the first holding unit. The main body has a second holding unit that detachably holds the first device. As the second holding part, various types of holding parts capable of detachably holding the first device can be used. The drive device is configured to move the first device from the first holding part side to the second holding part side when the first device, held by the first holding part of the holding device, and the second holding part of the main body are positioned opposite each other. The drive device is also configured to move the first device from the second holding part side to the first holding part side when the first device, held by the second holding part of the main body, and the first holding part of the holding device are positioned opposite each other. As the drive device, various types of drive devices capable of moving the first device from the first holding part side to the second holding part side and from the second holding part side to the first holding part side can be used. The magnetic field generating part of the first device and the power generating part of the second device are configured such that, when the first device is held by the first holding part of the main body, power is generated from the power generating part of the second device as the second device rotates together with the tool holder. By using the contactless power supply device of this disclosure, the first device can be quickly and easily attached to and detached from the spindle housing. In a different embodiment of the contactless power supply device of this disclosure, the first holding portion has a first positioning mechanism that defines a first holding position of the first device.Furthermore, the second holding portion has a second positioning mechanism that defines a second holding position of the first device. Various configurations of positioning mechanisms can be used for the first and second positioning mechanisms. In this embodiment, the first device can be reliably held in the first and second holding portions. In a different embodiment of the contactless power supply device of this disclosure, the first device has at least one first connecting portion and at least one second connecting portion. Furthermore, the first holding portion has at least one first hole, and the second holding portion has at least one second hole. The first device is held in the first holding portion by the insertion of the first connecting portion into the first hole, or by the insertion of the second connecting portion into the second hole. The drive device is configured to move the first device so that the second connecting portion is inserted into the second hole, with the first device held in the first holding portion and the second connecting portion and the second hole facing each other. In this embodiment, the first device can be easily held in the first holding portion or the second holding portion. In a different embodiment of the contactless power supply device of this disclosure, the first device has a support portion that supports a magnetic field generating portion. The first connecting portion and the second connecting portion constitute at least one connecting portion unit including one first connecting portion protruding coaxially from the support portion to one side and one second connecting portion protruding to the other side. In this embodiment, the first device can be more easily held in the first holding portion or the second holding portion. In a different embodiment of the contactless power supply device of this disclosure, the first device has at least one connecting rod having a first portion protruding from one side of a support and a second portion protruding from the other side. The first and second portions of the connecting rod constitute a first connecting portion and a second connecting portion. In this embodiment, the first device can be easily constructed.In a different embodiment of the contactless power supply device of this disclosure, the first holding portion has a first positioning mechanism (positioning device) that defines a first holding position of the first connecting portion within the first hole. The second holding portion has a second positioning mechanism (positioning device) that defines a second holding position of the second connecting portion within the second hole. Various configurations of positioning mechanisms can be used for the first and second positioning mechanisms. In this embodiment, the first device can be easily and reliably held in the first and second holding portions. In a different embodiment of the contactless power supply device of this disclosure, the first connecting portion has at least one first recess opening to the outer circumference, and the second connecting portion has at least one second recess opening to the outer circumference. The first positioning mechanism has a first engaging portion that protrudes inward from the inner wall surface forming the first hole and is capable of engaging with the first recess formed in the first connecting portion inserted into the first hole. Furthermore, the second positioning mechanism has a second engaging portion that protrudes inward from the inner wall surface forming the second hole and is capable of engaging with a second recess formed in the second connecting portion inserted into the second hole. In this embodiment, the first device can be held more securely in the first and second holding portions. In a different embodiment of the non-contact power supply device of this disclosure, the drive device has a first fluid supply passage and a second fluid supply passage. The first fluid supply passage is capable of supplying fluid into the first hole such that a driving force is generated to move the first connecting portion inserted into the first hole towards the second hole opposite the first hole. The second fluid supply passage is capable of supplying fluid into the second hole such that a driving force is generated to move the second connecting portion inserted into the second hole towards the first hole opposite the second hole. In this embodiment, the drive device for driving the first device can be easily configured. In a different embodiment of the contactless power supply device of this disclosure, the magnetic field generating unit of the first device is configured to generate a magnetic field using permanent magnets. The magnetic field generating unit has a front surface facing the power generating unit of the second device. The number and arrangement of permanent magnets constituting the magnetic field generating unit can be set as appropriate. The first device further has a cover. The cover has a front surface cover portion that covers the front surface of the magnetic field generating unit.Furthermore, the cover is configured to be movable relative to the tip surface of the magnetic field generating unit so that the distance between the tip surface cover portion and the tip surface of the magnetic field generating unit changes. The cover can be moved manually or by using a cover drive device. Various configurations of drive devices can be used as the cover drive device for moving the cover. Increasing the distance between the tip surface of the magnetic field generating unit and the tip surface cover portion reduces the amount of magnetic flux passing through the tip surface cover portion. This reduces the attractive force of the tip surface cover portion acting on chips adhering to the cover tip surface opposite to the tip surface of the magnetic field generating unit. In this embodiment, chips adhering to the cover tip surface can be easily removed. In a different embodiment of the non-contact power supply device of this disclosure, the cover has at least one nozzle for injecting fluid into the cover tip surface opposite to the tip surface of the magnetic field generating unit, and a third fluid supply passage for supplying fluid to the nozzle. In this embodiment, chips adhering to the cover tip surface can be removed by injecting fluid into the cover tip surface. In particular, the chip removal effect can be enhanced by spraying fluid onto the cover tip surface while the cover is moved so that the distance between the tip surface of the magnetic field generating unit and the tip surface cover is increased. In this embodiment, chips adhering to the cover tip surface can be removed with a simple configuration. In a different embodiment of the non-contact power supply device of this disclosure, a cover drive device is provided to move the cover relative to the tip surface of the magnetic field generating unit so that the distance between the tip surface of the magnetic field generating unit and the tip surface cover is increased. In this embodiment, the chip removal work adhering to the cover tip surface can be automated. In a different embodiment of the non-contact power supply device of this disclosure, while the first device is held in the first holding unit, the cover drive device moves the cover relative to the tip surface of the magnetic field generating unit so that the distance between the magnetic field generating unit and the tip surface cover is increased, and fluid is supplied from the third fluid supply passage to the spray nozzle. In this embodiment, chips adhering to the cover tip surface can be removed more easily. In a different embodiment of the non-contact power supply device of this disclosure, the magnetic field generating unit of the first device is configured to generate a magnetic field using a coil. The first device has a first connection terminal connected to a coil.Furthermore, the second holding part has a second connection terminal that can be connected to the first connection terminal. The second connection terminal is connected to a power supply. The first and second connection terminals are configured such that when the first device moves from the first holding part side to the second holding part side, the first and second connection terminals are connected, and when the first device moves from the second holding part side to the first holding part side, the connection between the first and second connection terminals is released. Various configurations of connection terminals can be used for the first and second connection terminals. This embodiment can also be applied when the first device has a magnetic field generating part that generates a magnetic field using a coil.

[0007] In the contactless power supply device of this disclosure, the first device that generates a magnetic field can be quickly and easily attached to and detached from the spindle housing.

[0008] This is a perspective view of an example of a machine tool using the non-contact power supply device of the first embodiment. This is a cross-sectional view of the main part of Figure 1 as seen from the direction of arrow II-II. This is a cross-sectional view of Figure 2 as seen from the direction of arrow III-III. This is a perspective view of the second device constituting the non-contact power supply device of the first embodiment. This is an assembly diagram of the second device constituting the non-contact power supply device of the first embodiment. This is a perspective view illustrating the first device constituting the non-contact power supply device of the first embodiment. This is a diagram showing the arrangement of permanent magnets in the first device constituting the non-contact power supply device of the first embodiment. This is a diagram illustrating the magnetic field generated by the permanent magnets shown in Figure 7. This is a diagram illustrating the non-interference region of the arm of the tool changer. This is a cross-sectional view of the main part of the first device constituting the non-contact power supply device of the first embodiment. This is a cross-sectional view of the main part of the first device with the cover moved. This is a perspective view illustrating the holding device constituting the non-contact power supply device of the first embodiment. This is a diagram illustrating the operation of holding the first device constituting the non-contact power supply device of the first embodiment in the spindle housing. This is a diagram illustrating the operation of holding the first device constituting the non-contact power supply device of the first embodiment in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes the contactless power supply device of the first embodiment, in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes the contactless power supply device of the first embodiment, in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes the contactless power supply device of the first embodiment, in the holding device. This is a diagram illustrating the operation of holding the first device, which constitutes the contactless power supply device of the first embodiment, in the holding device. This is a cross-sectional view of the main part of the contactless power supply device of the second embodiment. This is a perspective view of the first device, which constitutes the contactless power supply device of the second embodiment. This is a diagram illustrating the operation of holding the first device, which constitutes the contactless power supply device of the second embodiment, in the spindle housing.

[0009] Embodiments of the contactless power supply device of this disclosure will be described below with reference to the drawings. In this specification, mutually orthogonal X-axis, Y-axis, and Z-axis directions are defined (see Figure 1). In the embodiments described below, the rotational centerline P of the tool holder 200 is set to extend in the Z-axis direction. Specifically, the direction in which the rotational centerline P of the tool holder 200 extends is defined as the Z-axis. Also, when viewed from the front of the machine tool (in Figure 1, the direction in which the spindle slide 140 is viewed from the spindle housing 150 side), the left-right direction is defined as the X-axis and the front-back direction is defined as the Y-axis. Hereinafter, the direction in which the rotational centerline P extends (Z-axis direction) will be referred to as the "axial direction" or "first direction". The side on which the spindle 160 is positioned along the extending direction of the rotation centerline P (the upper side indicated by arrow Z2 in Figures 1 and 2) is called the "one side along the axial direction," the "rear end side along the axial direction," or the "first side along the first direction." The side opposite to the side on which the spindle 160 is positioned along the extending direction of the rotation centerline P (the side on which the tool 220 is positioned) (the lower side indicated by arrow Z1 in Figures 1 and 2) is called the "other side along the axial direction," the "tip side along the axial direction," or the "second side along the first direction." The direction that intersects the extending direction of the rotation centerline P (axial direction, first direction) is called the "radial direction" or the "third direction." The side of the rotation centerline P along the radial direction is called "one side along the radial direction (one radial side)," "inside along the radial direction (inside radial direction)," or "first side along the third direction (first side of the third direction)." The side of the rotation centerline P along the radial direction is called "the other side along the radial direction (other radial side)," "outside along the radial direction (outside radial direction)," or "second side along the third direction (second side of the third direction)." The circumferential direction centered on the rotation centerline P is called the "circumferential direction" or "second direction."When viewed from one side (arrow Z2 side) along the extending direction (axial direction, first direction) of the rotation centerline P (see Figure 3), the clockwise direction is called "one side along the circumferential direction (one side in the circumferential direction)" or "first side along the second direction (first side in the second direction)," and the counterclockwise direction is called "the other side along the circumferential direction (the other side in the circumferential direction)" or "the second side along the second direction (second side in the third direction)." Note that the "radial direction" changes depending on the position along the circumferential direction. The "X-axis direction" and "Y-axis direction" are included in the "radial direction." That is, the "X-axis direction" and "Y-axis direction" are perpendicular to the "Z-axis direction." For each part, the descriptions "axial direction," "radial direction," and "circumferential direction" refer to the "axial direction," "radial direction," and "circumferential direction" when the part is attached to or held in the spindle housing 150 and tool holder 200.

[0010] The following describes the case in which the contactless power supply device 400 of this disclosure is incorporated into a vertical machining center 100 having an automatic tool changer (ATC). Note that the contactless power supply device 400 of this disclosure can be incorporated into various machine tools other than the vertical machining center 100, such as transfer machines.

[0011] First, the configuration of the vertical machining center 100 will be described with reference to Figures 1 and 2. Figure 1 is a perspective view of the vertical machining center 100 in a state where the first device 500 (described in detail later), which constitutes the non-contact power supply device 400 of the first embodiment, is held in the spindle housing 150. Figure 2 is a cross-sectional view of the main part of Figure 1 as seen from the direction of arrow II-II. The vertical machining center 100 has a bed 110 and a column 120. A machining table 130 on which a workpiece (not shown) is placed is arranged on the bed 110. The machining table 130 is movable in the X-axis direction (left and right direction) and the Y-axis direction (front and back direction). A spindle slide 140 is arranged on the column 120 so as to be movable (up and down) in the Z-axis direction (up and down direction). The spindle housing 150 is attached to the spindle slide 140. The spindle 160 is rotatably supported in the spindle housing 150 by bearings 153. A tool holder 200 is detachably mounted on the spindle 160. In the vertical machining center 100, the tool holder 200 mounted on the spindle 160 is replaced by a tool changer 300. In this embodiment, the spindle housing 150 corresponds to the "main body that rotatably supports the spindle" in this disclosure.

[0012] The tool holder 200 has a holder body portion 210. The outer circumferential surface 212 of the holder body portion 210 has a tapered outer circumferential surface portion 212a at the rear end. The spindle 160 has an inner spindle space 160a formed by the inner spindle surface 161. The inner spindle surface 161 has a tapered inner spindle surface portion 161a at the tip. The rear end portion (shank portion) of the holder body portion 210 is inserted into the inner spindle space 160a. At this time, the holder body portion 210 is firmly held on the spindle 160 by the tapered fitting of the outer circumferential surface portion 212a of the holder body portion 210 and the inner spindle surface portion 161a of the spindle 160.

[0013] The holder body 210 holds a tool 220. The tool 220 is, for example, a joining tool having a shoulder 221 and a probe 222. The holder body 210 also houses an actuator (not shown). For example, a motor for correcting the cutting edge position of the tool 220 is housed inside. The holder body 210 also houses a temperature sensor 230 and a load sensor 240. The holder body 210 also houses electronic circuit boards 250 and 260, which are equipped with a control circuit that controls the actuator based on the temperature and load measured by the temperature sensor 230 and load sensor 240, a transmission circuit that transmits the measured temperature and load to the outside from the antenna 270, the actuator, and a voltage stabilization circuit that supplies stable power to the control circuit and transmission circuit. The voltage stabilization circuit adjusts the output voltage of the coil 640 (described later) of the second device 600 attached to the tool holder 200 (holder body 210) to a predetermined value.

[0014] The vertical machining center 100 is provided with a non-contact power supply device 400 that supplies power to the tool holder 200 (holder body 210) without contact. The non-contact power supply device 400 comprises a first device 500 having a magnetic field generating unit, a second device 600 having a power generating unit, a holding device 700, and a drive device. In this embodiment, the second device 600 is attached to the tool holder 200. The first device 500 is configured to be detachably held in the spindle housing 150 and the holding device 700. Specifically, the holding device 700 is provided with a first holding part (details to be described later) capable of detachably holding the first device 500. The spindle housing 150 is provided with a second holding part (details to be described later) capable of detachably holding the first device 500. The drive unit (details to be described later) drives (moves) the first device 500 from the first holding part side to the second holding part side when supplying power to the tool holder 200. The drive unit also drives (moves) the first device 500 from the second holding part side to the first holding part side when it is not necessary to supply power to the tool holder 200.

[0015] Next, the configuration of the second device 600, which constitutes the non-contact power supply device 400 of the first embodiment, will be described with reference to Figures 3 to 5. Figure 3 is a cross-sectional view of the main part of Figure 2 as seen from the direction of arrow III-III. Figure 4 is a perspective view of the second device 600, and Figure 5 is an assembly diagram of the second device 600. The second device 600 is composed of a first core 610, a second core 620, a third core 630, and a coil 640. The first to third cores 610, 620, and 630 are formed from a material having magnetic properties. In this embodiment, they are formed from steel.

[0016] The first core 610 has a base 611 and a plurality of protruding pieces 612. The base 611 has a hole in the center and is formed in an annular shape extending in the radial and circumferential directions. The plurality of protruding pieces 612 are formed to protrude from the base 611 along the center line at positions spaced apart in the circumferential direction on the outer circumference of the base 611. The second core 620 has a base 621 and a plurality of protruding pieces 622. The base 621 has a hole in the center and is formed in an annular shape extending in the radial and circumferential directions. The plurality of protruding pieces 622 are formed to protrude from the base 621 along the center line at positions spaced apart in the circumferential direction on the outer circumference of the base 621. The holder body 210 is inserted into the holes of the first core 610 and the second core 620. That is, the bases 621 and 622 extend circumferentially around the outer circumference of the holder body 210. Furthermore, the first core 610 and the second core 620 are arranged axially such that the protruding pieces 612 and 622 protrude in directions opposite to each other. The protruding pieces 612 and 622 are also arranged such that the protruding piece 622 is located between two adjacent protruding pieces 612 (arranged alternately along the circumferential direction). In this embodiment, the first core 610 is located on the first axial side (downward), and the second core 620 is located on the second axial side (upward). The third core 630 is formed in a cylindrical shape with a hole in the center. The third core 630 is located between the first core 610 and the second core 620, inside the protruding pieces 612 and 622. The coil 640 is wound around the outer circumference of the third core 630. With the first device 500 held in the spindle housing 150, the second device 600 rotates together with the tool holder 200 (holder body 210), generating power from the coil 640. In this embodiment, the first to third cores 610, 620, 630 and the coil 640 constitute the "power generation unit" of this disclosure. The second device 600 constitutes the "rotating side device" of this disclosure. The protruding piece 612 corresponds to the "first protruding piece" of this disclosure, and the protruding piece 622 corresponds to the "second protruding piece" of this disclosure.

[0017] In the second device 600 of this embodiment, the coil 640 is wound in the circumferential direction. This makes it possible to shorten the axial length of the second device 600 compared to when the coil 640 is wound in the axial direction. Furthermore, the base 611 of the first core 610 and the base 621 of the second core 620 are arranged on both sides of the coil 640 in the axial direction, the protruding pieces 612 of the first core 610 and the protruding pieces 622 of the second core 620 are arranged alternately on the outside of the coil 640, and the third core 630 is arranged on the inside of the coil 640. This makes it possible to generate power efficiently.

[0018] Next, the configuration of the first device 500, which constitutes the non-contact power supply device 400 of the first embodiment, will be described with reference to Figures 3, 6, and 10. Figure 3 is a cross-sectional view of Figure 2 taken from the direction of arrow III-III. Figure 6 is a perspective view of the first device 500. Figure 10 is a cross-sectional view of the main part of the first device 500. The first device 500 has a magnetic field generating unit 510 and a support unit 520.

[0019] The magnetic field generating section 510 is formed from a material having magnetic properties. In this embodiment, it is formed from steel. The magnetic field generating section 510 has a front surface 510a, side surfaces 510b and 510c, an upper surface 510d, and a bottom surface 510e. The front surface 510a of the magnetic field generating section is formed on the side facing the second device 600 (power generating section) when the first device 500 is held in the holding section 171 of the spindle housing 150 (details will be described later). Furthermore, when the first device 500 is held in the holding section 171 of the spindle housing 150, the front surface 510a of the magnetic field generating section is formed in an arc shape centered on the rotational center line P of the tool holder 200 (holder body 210). As a result, when the second device 600 rotates together with the tool holder 200 while the first device 500 is held in the holding portion 171 of the spindle housing 150, a predetermined gap (air gap) is formed between the outer circumferential surface of the second device 600 (the outer circumferential surface of the protruding piece 612 and the protruding piece 622) and the tip surface 510a of the magnetic field generating portion.

[0020] Furthermore, the magnetic field generating unit 510 has a plurality of permanent magnets 511 that generate a magnetic field. In this embodiment, as shown in Figure 3, the plurality of permanent magnets 511 are arranged at equal intervals along the tip surface 510a of the magnetic field generating unit (in an arc shape). The plurality of permanent magnets 511 are positioned close to the tip surface 510a of the magnetic field generating unit.

[0021] Here, when a tool changer 300 equipped with an arm 310 is used, the arm 310 moves up and down and rotates during tool changes, etc. For this reason, the magnetic field generating unit 510 of the first device 500, which is held by the holding part 171 of the spindle housing 150, must be positioned in a region that does not interfere with the arm 310 of the tool changer 300 (non-interference region). Figure 9 shows an example of the non-interference region of the arm 310 of the tool changer 300. Figure 9 is a view from the tool 220 side (Z1 side). In Figure 9, the line extending in the direction of arrow Y1 from the rotation center line P of the tool holder 200 (holder body part 210) is set to 0°. Figure 9 shows that there is a non-interference region of 130°. The non-interference region of the arm 310 of the tool changer 300 changes depending on the tool changer 300. In this embodiment, when the first device 500 is held by the holding portion 171 of the spindle housing 150, the magnetic field generating portion 510 of the first device 500 is configured to be positioned within a non-interference region. For example, the center angle of the tip surface 510a of the magnetic field generating portion 510 (the area where the permanent magnet 511 is positioned) is set to a predetermined range (for example, within the range of 90° to 110°) within the 130° non-interference region shown in Figure 9. The predetermined range within the non-interference region of the arm 310 of the tool changer 300 corresponds to the "predetermined range along the circumferential direction on the outer circumference side of the second device" in this disclosure.

[0022] Furthermore, in the magnetic field generating unit 510 of this embodiment, the multiple permanent magnets 511 are arranged in a state where the magnetization direction of adjacent permanent magnets 511 in the circumferential direction is rotated by 90 degrees, as shown in Figure 7. In Figure 7, four types of permanent magnets 511a to 511d with different magnetization directions (permanent magnets 511a and 511b that are magnetized in the radial direction, and permanent magnets 511b and 511d that are magnetized in the circumferential direction) are arranged along the circumferential direction. Permanent magnet 511a is magnetized with a south pole on its radially inner side (towards the tip surface 510a of the magnetic field generating part) and a north pole on its radially outer side (opposite to the tip surface 510a of the magnetic field generating part). Permanent magnet 511c, located first circumferentially to permanent magnet 511a (clockwise in Figure 7), is magnetized with a north pole on its first circumferentially to permanent magnet 511a and a south pole on its second circumferentially to permanent magnet 511b, is magnetized with a north pole on its radially inner side and a south pole on its radially outer side. Permanent magnet 511d, located first circumferentially to permanent magnet 511b, is magnetized with a south pole on its first circumferentially to permanent magnet 511d and a north pole on its second circumferentially to permanent magnet 511d. On the first circumferential side of permanent magnet 511d, permanent magnets 511a, 511c, 511b, and 511d are arranged sequentially in units.

[0023] Figure 8 shows the magnetic field generated when multiple permanent magnets 511 (511a to 511d) are arranged as shown in Figure 7. From Figure 8, it can be seen that when multiple permanent magnets 511 (511a to 511d) are arranged as shown in Figure 7, the magnetic field is concentrated radially inward of the radially magnetized permanent magnets 511a and 511b, and almost no magnetic field is generated radially outward of the permanent magnets 511a to 511d. This makes it possible to increase the amount of power generated from the coil 640 of the second device 600 when the second device 600 rotates together with the tool holder 200 while the first device 500 is held in the holding part 171 of the spindle housing 150. In addition, when the magnetic field generating part 510 of the first device 500 is made up of permanent magnets 511, chips and the like generated during workpiece processing adhere to the outer surface of the magnetic field generating part 510 due to the magnetic force of the permanent magnets 511. If chips or other debris adhere to the outer surface of the magnetic field generating unit 510, the machining accuracy of the workpiece may decrease. Therefore, it is necessary to remove the chips adhering to the outer surface of the magnetic field generating unit 510. In this embodiment, since the magnetic field is concentrated on the tip surface 510a of the magnetic field generating unit, most of the chips adhere to the tip surface 510a of the magnetic field generating unit. In other words, the amount of chips adhering to areas other than the tip surface 510a of the magnetic field generating unit can be reduced. Therefore, the chip removal work only needs to be performed on the tip surface 510a of the magnetic field generating unit, and the chip removal work can be performed efficiently.

[0024] Here, when removing chips adhering to the tip surface 510a of the magnetic field generating unit, the magnetic force of the permanent magnet 511 acts on the chips, making the chip removal work difficult. In the first apparatus 500 of this embodiment, a cover 530 is provided to reduce the influence of the magnetic force of the permanent magnet 511 and to make it easier to remove chips. The configuration of the cover 530 will be described with reference to Figures 6 and 10-12. The cover 530 is formed of a material having magnetic properties. In this embodiment, it is formed of a resin having magnetic properties. By forming it of a resin having magnetic properties, it can be easily formed into various shapes. The cover 530 has a cover tip wall 531, cover side walls 532, 533, cover top wall 534, and cover bottom wall 535. The cover tip wall 531, cover side walls 532, 533, cover top wall 534, and cover bottom wall 535 form an insertion space into which the magnetic field generating unit 510 can be inserted. The magnetic field generating unit 510 is inserted into the insertion space of the cover 530 such that its front end surface 510a, side surfaces 510b and 510c, top surface 510d, and bottom surface 510e face the front end wall 531, side walls 532 and 533, top wall 534, and bottom wall 535 of the cover, respectively. The cover 530 is configured to be movable relative to the magnetic field generating unit 510 in the direction in which the magnetic field generating unit 510 is inserted into the insertion space of the cover 530 and in the direction in which it is removed from the insertion space, that is, in the direction in which the distance between the front end surface 510a of the magnetic field generating unit and the front end wall 531 of the cover changes (in the direction of the arrows shown in Figures 10 and 11). Here, the front end wall 531 of the cover has a front end surface on the side facing the second device 600 (the side opposite to the side facing the front end surface 510a of the magnetic field generating unit). The tip surface includes tip surface portions 531a to 531c. Tip surface portion 531a is formed on the cover bottom wall 535 side and is positioned opposite the magnetic field generating tip surface 510a. That is, the magnetic field generating tip surface 510a is covered by the tip surface portion 531a of the cover 530. Tip surface portion 531b is connected to the end of tip surface portion 531a on the cover top wall 534 side and protrudes on the side opposite to the side facing the magnetic field generating tip surface 310a.The tip surface portion 531c is connected to the end of the tip surface portion 531b opposite to the side facing the magnetic field generating tip surface 310a, and extends in the same direction as the tip surface portion 531a. The tip surface portions 531b and 531c and the upper cover wall 534 form a projection 531A that protrudes from the tip surface portion 531a on the side opposite to the side facing the magnetic field generating tip surface 310a. In this embodiment, the cover tip wall 531 corresponds to the "tip surface cover portion that covers the magnetic field generating tip surface" in this disclosure. Also, the tip surface portion 531a corresponds to the "cover tip surface of the tip surface cover portion opposite to the magnetic field generating tip surface" in this disclosure.

[0025] The cover 530 also has a fluid chamber 537, a fluid supply passage 538, and a plurality of injection ports (nozzles) 539. The fluid chamber 537 is formed in the protrusion 531A. The fluid chamber 537 can also be provided in a location other than the protrusion 531A. The fluid supply passage 538 supplies fluid into the fluid chamber 537. The injection ports 539 are formed in the tip surface portion 531b and communicate with the fluid chamber 537. The injection ports 539 are configured to inject fluid of a predetermined flow velocity and flow rate onto the tip surface portion 531a. The number and arrangement of the injection ports 539 can be selected as appropriate. Air, coolant, etc., can be used as the fluid. In this embodiment, air is used. In this embodiment, the fluid chamber 537, the fluid supply passage 538, and the injection ports 539 constitute the "fluid injection device" of this disclosure.

[0026] As shown in Figure 10, when the magnetic field generating unit 510 is inserted into the insertion space of the cover 530, and the cover 530 is brought into close contact with the magnetic field generating unit 510 (the tip surface 510a of the magnetic field generating unit is brought into close contact with the cover tip wall 531), there is virtually no gap between the tip surface 510a of the magnetic field generating unit and the cover tip wall 531, so sufficient magnetic flux passes through the cover tip wall 531. On the other hand, as shown in Figure 11, when the cover 530 is moved so that the distance between the cover 530 and the magnetic field generating unit 510 (the distance between the tip surface 510a of the magnetic field generating unit and the cover tip wall 531) increases, a gap is formed between the tip surface 510a of the magnetic field generating unit and the cover tip wall 531. In this case, the magnetic flux reduced by the gap passes through the cover tip wall 531. That is, the attractive force that causes chips to adhere to the tip surface portion 531a decreases. In this state, when fluid is supplied from the fluid supply passage 538 into the fluid chamber 537, fluid is injected from the injection nozzle 539, which is in communication with the fluid chamber 537, onto the tip surface portion 531a. This removes chips adhering to the tip surface portion 531. When the supply of fluid from the fluid supply passage 538 into the fluid chamber 537 is stopped, the injection of fluid from the injection nozzle 539 onto the tip surface portion 531a stops.

[0027] One method for moving the cover 530 is to have an operator move it manually. However, automation of the operation of moving the cover 530 and the operation of spraying fluid from the nozzle 539 may be required. The first device 500 of this embodiment has a cover drive device 536 for moving the cover 530 in order to automate the chip removal operation. In this embodiment, an air cylinder is used as the cover drive device 536. The air cylinder generates an elastic force that moves the cover 530 in a direction in which the cover 530 comes into close contact with the magnetic field generating unit 510. Furthermore, when the fluid pressure in the fluid chamber 537 increases, the cover drive device 536 is configured to generate a force that moves the cover in a direction that widens the gap between the cover 530 and the magnetic field generating unit 510, against the elastic force. In this case, if no fluid is supplied to the fluid chamber 537b from the fluid supply passage 538, the cover 530 and the magnetic field generating unit 510 are in close contact due to the cover drive device 536. On the other hand, when fluid is supplied to the fluid chamber 537b from the fluid supply passage 538, the cover 530 moves by the cover drive device 536 so that the gap between the cover 530 and the magnetic field generating unit 510 widens, and fluid is injected from the injection nozzle 539 onto the tip surface portion 531a. When using the first device 500 having the cover drive device 536, fluid chamber 537, fluid supply passage 538, and injection nozzle 539, the operation of moving the cover 530 and the operation of injecting fluid onto the tip surface portion 531a can be automated. That is, the operation of removing chips adhering to the tip surface portion 531a of the cover 530 can be automated. In this embodiment, the fluid supply passage 538 corresponds to the "third fluid supply passage" of this disclosure.

[0028] The support portion 520 of the first device 500 supports the magnetic field generating portion 510. The support portion 520 has connecting rods 523 and 526. The connecting rods 523 and 526 have end faces 323a and 526a at one end and end faces 323b and 526b at the other end. The support portion 520 also has support end faces 521 and 522 formed on opposing sides. Support end face 521 is formed on the side facing the holding device 700 (holding portion 730). Support end face 522 is formed on the side facing the holding device 170 (holding portion 171) which is attached to the spindle housing 150. The connecting rods 523 and 526 are attached to the support portion 520 so as to protrude from the support end faces 521 and 522. In other words, the connecting rods 523 and 526 have first portions 523A and 526A that protrude from the support end face 521, and second portions 523B and 526B that protrude from the support end face 522. The first portion 523A and the second portion 523B of the connecting rod 523 have grooves 524a and 524b and O-rings 525a and 525b that open to the outer circumference. Similarly, the first portion 526A and the second portion 526B of the connecting rod 526 have grooves 527a and 527b and O-rings 528a and 528b that open to the outer circumference. In this embodiment, the first portion 523A of the connecting rod 523 and the first portion 526A of the connecting rod 526 correspond to "at least one first connecting portion" in this disclosure, and the second portion 523B of the connecting rod 523 and the second portion 526B of the connecting rod 526 correspond to "at least one second connecting portion" in this disclosure. Furthermore, the first portion 523A and the second portion 523B of the connecting rod 523 (the first portion 526A and the second portion 526B of the connecting rod 526) constitute a "connecting portion unit" in this disclosure that includes one first connecting portion protruding from the support portion coaxially to one side and one second connecting portion protruding to the other side. Furthermore, the support portion 520 corresponds to a "support portion that supports the magnetic field generating portion" in this disclosure. Furthermore, the first device 500 constitutes a "fixed side device" in this disclosure.

[0029] Next, the configuration of the holding device 700 will be described with reference to Figures 1, 12, and 13. The holding device 700 holds the first device 500 when it is not necessary to supply power to the tool holder 200. The holding device 700 has a base portion 710, a support portion 720, and a holding portion 730. The holding portion 730 has a holding portion end face 732 on the side facing the first device 500. The holding portion 730 also has holes 733a and 734a. The holes 733a (734a) are formed by the inner wall surface 733 (734) and open to the holding portion end face 732 (they have openings). The holes 733a (734a) are formed so that the first portion 523A (526A) of the connecting rod 523 (526) of the first device 500 can be inserted. Furthermore, the retaining portion 730 has an engaging portion 735 that can engage with a groove 524a formed in the first portion 523A of the connecting rod 523, and an engaging portion 736 that can engage with a groove 524a formed in the first portion 526A of the connecting rod 526. Elastic force is applied to the engaging portion 735 so that a portion of it protrudes inward from an opening formed in the inner wall surface 733. Similarly, elastic force is applied to the engaging portion 736 so that a portion of it protrudes inward from an opening formed in the inner wall surface 734. In this embodiment, ball plungers are used as the engaging portions 735 and 736. In addition, there is a fluid supply passage 737 that supplies fluid to the space on the opposite side of the opening of the hole 733a (the side opposite to the side into which the first portion 523A of the connecting rod 523 is inserted) and to the space on the opposite side of the opening of the hole 734a (the side opposite to the side into which the first portion 526A of the connecting rod 526 is inserted). When the first portion 523A of the connecting rod 523 is inserted into the hole 733a, the engaging portion 735 engages with the groove 524a of the first portion 523A, thereby defining the holding position of the first portion 523A. In addition, the O-ring 525a of the first portion 523A of the connecting rod 523 seals the space between the first portion 523A and the inner wall surface 733. Similarly, when the first portion 526A of the connecting rod 526 is inserted into the hole 734a, the engaging portion 736 engages with the groove 527a of the first portion 526A, thereby defining the holding position of the first portion 526A. In addition, the O-ring 528a of the first portion 526A of the connecting rod 526 seals the space between the first portion 526A and the inner wall surface 734.

[0030] The holding device 700 is configured to be movable to a standby position that does not interfere with the machining work, and to a transfer position where the first device 500 is transferred from the holding device 700 (holding section 730) to the holding device 170 (holding section 171) or from the holding device 170 (holding section 171) to the holding device 700 (holding section 730). In this embodiment, the base 710 of the holding device 700 is connected to the machining table 130, and the holding device 700 is moved by moving the machining table. The method of moving the holding device 700 is not limited to this method. For example, a holding device drive device that can move the holding device 700 independently can also be provided.

[0031] In this embodiment, the holding portion 730 corresponds to the "first holding portion" of the present disclosure. The holes 733a and 734a correspond to the "at least one first hole" of the present disclosure. The fluid supply passage 737 corresponds to the "first fluid supply passage" of the present disclosure. The groove 524a of the first portion 523A of the connecting rod 523 and the groove 527a of the first portion 526A of the connecting rod 526 correspond to the "at least one first recess" of the present disclosure. The engaging portion 735 that can engage with the groove 524a of the first portion 523A of the connecting rod 523 and the engaging portion 736 that can engage with the groove 526a of the first portion 526A of the connecting rod 526 constitute the "first positioning mechanism" of the present disclosure. The holes 733a and 734a and the fluid supply passage 737 constitute a part of the "drive device" of the present disclosure.

[0032] Next, the configuration of the holding device 170 will be described with reference to Figures 2 and 13. The holding device 170 holds the first device 500 when power is supplied to the tool holder 200. The holding device 700 has a holding portion 171 attached to the spindle housing 150. The holding portion 171 has a holding portion end face 172 on the side facing the first device 500. The holding portion 171 also has holes 173a and 174a. The holes 173a (174a) are formed by the inner wall surface 173 (174) and open to the holding portion end face 172 (they have openings). The holes 173a (174a) are formed so that the second portion 523B (526B) of the connecting rod 523 (526) of the first device 500 can be inserted. Furthermore, the retaining portion 171 has an engaging portion 175 that can engage with a groove 524b formed in the second portion 523B of the connecting rod 523, and an engaging portion 176 that can engage with a groove 527b formed in the second portion 526B of the connecting rod 526. Elastic force is applied to the engaging portion 175 so that a portion of it protrudes inward from an opening formed in the inner wall surface 173. Similarly, elastic force is applied to the engaging portion 176 so that a portion of it protrudes inward from an opening formed in the inner wall surface 174. In this embodiment, ball plungers are used as the engaging portions 175 and 176. In addition, there is a fluid supply passage 177 that supplies fluid to the space on the opposite side of the opening of the hole 173a (the side opposite to the side into which the second portion 523B of the connecting rod 523 is inserted) and to the space on the opposite side of the opening of the hole 174a (the side opposite to the side into which the second portion 526B of the connecting rod 526 is inserted). When the second portion 523B of the connecting rod 523 is inserted into the hole 173a, the engaging portion 175 engages with the groove 524b of the second portion 523B, thereby defining the holding position of the second portion 523B. In addition, the O-ring 525b of the second portion 523B of the connecting rod 523 seals the space between the second portion 523B and the inner wall surface 173. Similarly, when the second portion 526B of the connecting rod 526 is inserted into the hole 174a, the engaging portion 176 engages with the groove 527b of the second portion 526B, thereby defining the holding position of the second portion 526B. In addition, the O-ring 528b of the second portion 526B of the connecting rod 526 seals the space between the second portion 526B and the inner wall surface 174.

[0033] In this embodiment, the holding portion 171 corresponds to the "second holding portion" of the present disclosure. The holes 173a and 174a correspond to the "at least one second hole" of the present disclosure. The fluid supply passage 177 corresponds to the "second fluid supply passage" of the present disclosure. The groove 524b of the second portion 523B of the connecting rod 523 and the groove 527b of the second portion 526B of the connecting rod 526 correspond to the "at least one second recess" of the present disclosure. The engaging portion 175 that can engage with the groove 524b of the second portion 523B of the connecting rod 523 and the engaging portion 176 that can engage with the groove 527b of the second portion 526B of the connecting rod 526 constitute the "second positioning mechanism" of the present disclosure. The holes 173a and 174a and the fluid supply passage 177 constitute the remaining part of the "drive device" of the present disclosure.

[0034] Next, the operation of the vertical machining center 100 will be explained with reference to Figures 13 to 18. Normally, the first device 500 is held in the holding part 730 of the holding device 700. The holding device 700 is then moved to the standby position.

[0035] When supplying power to the tool holder 200, the holding device 700 (holding section 730) is moved from the standby position to the transfer position, as shown in Figure 13. At the transfer position, as shown in Figure 14, the holes 173a and 174a of the holding device 170 (holding section 171) face the second portions 523B and 526B of the connecting rods 523 and 526 of the first device 500 held by the holding device 700 (holding section 730). For example, the tips of the second portions 523B and 526B of the connecting rods 523 and 526 are inserted into the holes 173a and 174a. In the state shown in Figure 14, fluid is supplied from the fluid supply passage 737 into the holes 733a and 734a of the holding device 700 (holding section 730). As a result, the fluid pressure acts on the end faces 523a and 526a of the connecting rods 523 and 526, causing them to move toward the holding device 170 (holding part 171). That is, the connecting rods 523 and 526 are pushed out of the holes 733a and 734a of the holding part 730 and inserted into the holes 173a and 174a of the holding part 171. At this time, the fluid pressure causes the engaging parts 735 and 736 to move outward, releasing the engagement between the grooves 524a and 527a and the engaging parts 735 and 736. Then, as shown in Figure 15, the support end face 522 of the support part 520 of the first device 500 comes into contact with the holding end face 172 of the holding part 171, stopping the movement of the connecting rods 523 and 526 (the movement of the first device 500). At this time, the groove 524b of the second portion 523B of the connecting rod 523 and the groove 527b of the second portion 526B of the connecting rod 526 engage with the engaging portions 175 and 176. That is, the insertion position of the second portion 523B of the connecting rod 523 within the hole 173a and the insertion position of the second portion 526B of the connecting rod 526 within the hole 174a are defined. In this state, the holding device 700 is moved to the standby position as shown in Figure 16. The positions in which the engaging portions 175 and 176 of the holding portion 171 engage with the grooves 524b and 527b of the connecting rods 523 and 527, respectively, correspond to the "second holding position" of this disclosure.

[0036] When it is no longer necessary to supply power to the tool holder 200, the holding device 700 is moved to the transfer position, as shown in Figure 17. At the transfer position, the holes 733a and 734a of the holding device 700 (holding portion 730) face the first portions 523A and 526A of the connecting rods 523 and 526 of the first device 500, which is held by the holding device 170 (holding portion 171). For example, the tips of the first portions 523 and 526A of the connecting rods 523 and 526 are inserted into the holes 733a and 734a. In the state shown in Figure 17, fluid is supplied from the fluid supply passage 177 into the holes 173a and 174a of the holding device 170 (holding portion 171). As a result, the fluid pressure acts on the end faces 523b and 526b of the connecting rods 523 and 526, causing them to move toward the holding device 700 (holding part 730). That is, the connecting rods 523 and 526 are pushed out of the holes 173a and 174a of the holding part 171 and inserted into the holes 733a and 734a of the holding part 730. At this time, the fluid pressure causes the engaging parts 175 and 176 to move outward, releasing the engagement between the grooves 524b and 527b and the engaging parts 175 and 176. Then, as shown in Figure 18, the support end face 521 of the support part 520 of the first device 500 comes into contact with the holding end face 732 of the holding part 730, stopping the movement of the connecting rods 523 and 526 (the movement of the first device 500). At this time, the groove 524a of the first portion 523A of the connecting rod 523 and the groove 327a of the first portion 526A of the connecting rod 526 engage with the engaging portions 735 and 736. That is, the insertion position of the first portion 523A of the connecting rod 523 within the hole 733a and the insertion position of the first portion 526A of the connecting rod 526 within the hole 734a are defined. In this state, the holding device 700 is moved to the standby position (see Figure 13). The positions where the engaging portions 735 and 736 of the holding portion 730 engage with the grooves 524a and 527a of the connecting rods 523 and 527, respectively, correspond to the "first holding position" of this disclosure.

[0037] In the first embodiment, the device 500 used a magnetic field generating unit 510 that generates a magnetic field using a permanent magnet 511, but the magnetic field generating unit is not limited to this. A vertical machining center 100 using the magnetic field generating unit 510 of the second embodiment will be described with reference to Figures 19 to 21. Figure 19 is a cross-sectional view of the main part of the vertical machining center 100 using the non-contact power supply device 400 of the second embodiment. Figure 20 is a perspective view of the first device 500 that constitutes the non-contact power supply device 400 of the second embodiment. Figure 21 is a diagram illustrating the operation of holding the first device 500 that constitutes the non-contact power supply device 400 of the second embodiment in a holding unit 171 attached to the spindle housing 150. The non-contact power supply device 400 of the second embodiment differs from the non-contact power supply device 400 of the first embodiment in that it has a magnetic field generating unit that generates a magnetic field using a coil. In the following, only the configurations that differ from the non-contact power supply device 400 of the first embodiment will be described.

[0038] In the second embodiment of the non-contact power supply device 400, the magnetic field generating unit 510 has a core 512 and a coil 513. The core 512 extends along the extending direction of the tip surface 510a of the magnetic field generating unit. The coil 513 is wound around the core 512. The support unit 520 is provided with a connection terminal 529 connected to the coil 513. In this embodiment, a male terminal protruding from the end surface 522 of the support unit is used as the connection terminal 529. The number of connection terminals 529 can be selected as appropriate. In this embodiment, four connection terminals 529a to 529d are provided. The holding unit 171 constituting the holding device 170 is provided with a connection terminal 178 that can be connected to the connection terminal 529 provided on the support unit 520 of the first device 500. In this embodiment, a female terminal into which the connection terminal 529 can be inserted is used as the connection terminal 178. The connection terminal 178 opens (has an opening) to the end surface 172 of the holding unit. The number of connection terminals 178 can be selected as appropriate. In this embodiment, four connection terminals 178a to 178d are provided that can be connected to connection terminals 529a to 529d. Connection terminals 178 are connected to a power supply (not shown). Connection terminals 529 (529a to 529d) and connection terminals 178 (178a to 178d) are configured to be connected when the first device 500 is held by the holding part 171, and to be disconnected when the first device 500 is held by the holding part 730. In this embodiment, connection terminals 529 (529a to 529d) correspond to the "first connection terminals" of this disclosure. Also, connection terminals 178 (178a to 178d) correspond to the "second connection terminals" of this disclosure. Note that connection terminals 529 and connection terminals 178 can be connected with various configurations.

[0039] The operation of holding the first device 500 in the holding device (holding part 171) will be described with reference to Figure 21. Similar to the non-contact power supply device 400 of the first embodiment, the holding device 700 (holding part 730) is moved so that the second portions 523B and 526B of the connecting rods 523 and 526 of the first device 500, which is held in the holding device 700 (holding part 730), face the holes 173a and 174a of the holding part 171. At this time, the connection terminals 529a to 529d of the support part 520 are also positioned to face the connection terminals 178a to 178d of the holding part 171. In this state, fluid is supplied from the fluid supply passage 737 into the holes 733a and 734a to move the connecting rods 523 and 526 (first device 500) toward the holding part 171. The movement of the connecting rods 523 and 526 (first device 500) is stopped when the end face 522 of the support portion 120 comes into contact with the end face 172 of the holding portion 171. At this time, the connecting rods 523 and 526 are positioned when the engaging portions 175 and 176 engage with the grooves 524b and 527b of the connecting rods 523 and 526. In addition, the connection terminals 529a to 529d of the support portion 520 (first device 500) are connected to the connection terminals 178a to 178d of the holding portion 171 (holding device 170). As a result, power is supplied to the coil 513 of the magnetic field generating portion 510 of the first device 500. That is, as the second device 600 rotates together with the tool holder 200, power is generated from the coil 640 of the second device 600.

[0040] When removing chips adhering to the cover 630, as described above, fluid is supplied from the fluid supply passage 538 into the fluid chamber 537. When the fluid pressure in the fluid chamber 537 increases, the cover 530 moves in a direction that widens the gap between the tip surface 510a of the magnetic field generating unit and the tip surface 531 of the cover, against the elastic force generated by the cover drive mechanism 536 that moves the cover 530 in a direction that brings it into close contact with the magnetic field generating unit 510 (see Figure 11). At this time, the fluid in the fluid chamber 537 is sprayed through the nozzle 539 onto the tip surface portion 531a of the cover 530 that faces the tip surface 510a of the magnetic field generating unit. In other words, the fluid is sprayed onto the tip surface portion 531a of the cover 530 while the magnetic attraction force of the coil 513 is reduced. As a result, chips adhering to the tip surface portion 531a of the cover 530 can be removed by the fluid sprayed from the nozzle 539. By interrupting the power supply to the coil 513, chips adhering to the tip surface portion 531a of the cover 530 can be removed more easily. The operation to remove chips adhering to the tip surface portion 531a of the cover 530 can be performed while the first device 500 is held by the holding device 170 (holding part 171), or while the first device 500 is held by the holding device 700 (holding part 730). Preferably, it is performed while the first device 500 is held by the holding device 700 (holding part 730). In addition, the operation to move the cover 530 (the operation to change the distance between the tip surface 530a of the magnetic field generating part and the cover tip wall 531) can be performed manually. In addition, the operation to remove chips adhering to the tip surface portion 531a of the cover 530 can be performed manually.

[0041] This disclosure is not limited to the configuration described in the embodiments, and various modifications, additions, and deletions are possible. In the embodiments, when the first device 500 is transferred between the holding portion 730 of the holding device 700 and the holding portion 171 of the spindle housing 750, the holding device 700 (holding portion 730) is moved, but the spindle housing 750 may be moved, or the holding device 700 (holding portion 730) and the spindle housing 750 may be moved. In the embodiments, the holding device 700 is connected to the machining table 130, and the holding device 700 is moved by moving the machining table 130, but a drive device for the holding device can also be used to move the holding device 700. The magnetic field generating unit 510 of the first device 500 and the power generating unit of the second device 600 only need to be able to generate power from the power generating unit of the second device 600 by rotating the second device 600 together with the tool holder 200 while the first device 500 is held in the spindle housing 150 (holding unit 171), and are not limited to the magnetic field generating unit and power generating unit described in the embodiment. The magnetic field generating unit 510 is composed of multiple permanent magnets 511, but it can also be composed of a single permanent magnet. In addition, the multiple permanent magnets are arranged with the magnetization direction of adjacent permanent magnets in the circumferential direction rotated by 90 degrees, but the arrangement of the multiple permanent magnets is not limited to this. In the embodiment, an air cylinder is used as a cover driving device to move the cover 530 relative to the magnetic field generating unit 510, but the cover driving device is not limited to this. The cover 530 can also be moved manually. The cover 530 can also be omitted. In this embodiment, a fluid injection device comprising a fluid chamber 537, a fluid supply passage 538, and an injection port 529 was used as a fluid injection device for injecting fluid into the tip surface portion 531a of the cover 530, but the fluid injection device is not limited to this. The fluid injection device can also be omitted. The configuration of the holding portion 730 (first holding portion) of the holding device 700 and the configuration of the holding device 170 (holding portion 171) (second holding portion) attached to the spindle housing 150 are not limited to the configurations described in this embodiment. The configurations for holding the first device 500 in the holding device 700 (holding portion 730) and the configuration for holding it in the holding device 170 (holding portion 171) are not limited to the configurations described in this embodiment.The configuration of the drive device for driving the first device 500 is not limited to the configuration described in the embodiment. Although a support portion 520 was used in which the first portion 523A (526A) and the second portion 523B (526B) of the connecting rod 523 (526) protrude from the support portion end faces 521 and 522, a support portion can also be used in which separate first portion 523A (526A) and second portion 523B (526B) protrude from the support portion end faces 521 and 522. Furthermore, it is sufficient that at least one first portion and at least one second portion protrude from the support portion end faces 521 and 522. Each configuration described in the embodiment can be used individually, or multiple configurations selected as appropriate can be used in combination.

[0042] 100... Machine tool, 110... Bed, 120... Column, 130... Machining table, 140... Spindle slide, 150... Spindle housing, 153... Bearing, 160... Spindle, 160a... Spindle inner space, 161... Spindle inner surface, 161a... Spindle inner surface portion, 170... Holding device, 171... Holding part, 172... Holding part end face, 173, 174... Inner wall surface, 173a, 174a... Hole, 175, 176... Engaging part, 177... Fluid supply passage, 178a-178d... Connection terminal, 200... Tool holder, 210... Holder Main body, 212... Outer surface of main body, 212a... Outer surface portion of main body, 213... Through hole, 220... Tool, 221... Shoulder, 222... Probe, 223... Hole, 230, 240... Sensor, 250, 260... Electronic circuit board, 270... Antenna, 300... Tool changing device, 310... Arm, 500... First device, 510... Magnetic field generating unit, 510a... Front surface of magnetic field generating unit, 510b, 510c... Side surface of magnetic field generating unit, 510d... Top surface of magnetic field generating unit, 510e... Bottom surface of magnetic field generating unit, 511, 511a-511e... Permanent 512... core, 513... coil, 520... support part, 521, 522... end face of support part, 523, 526... connecting rod, 523A, 526A... first part, 523B, 526B... second part, 523a, 523b, 526a, 526b... end face of connecting rod, 524a, 524b, 527a, 527b... groove, 525a, 525b, 528a, 528b... O-ring, 529a to 529d... connection terminal, 530... cover, 531... cover tip wall, 531A... projection, 531a to 531c... tip surface portion, 53 2, 533... Cover side wall, 534... Cover top wall, 535... Cover bottom wall, 536... Cover drive device, 537... Fluid chamber, 538... Fluid supply passage, 539... Injection nozzle, 600... Second device, 610, 620, 630... Core, 611, 621... Base, 612, 622... Projection piece, 640... Coil, 700... Holding device, 710... Base, 720... Support part, 730... Holding part, 732... Holding part end face, 733, 734... Inner wall surface, 733a, 734a... Hole, 735, 736... Engaging part, 737... Fluid supply passage

Claims

1. A non-contact power supply device that supplies power to a tool holder that rotates with a spindle rotatably supported on a main body, comprising: a first device, a second device, a holding device, and a drive device, wherein the first device has a magnetic field generating unit, the second device has a power generating unit and is attached to the tool holder, the holding device has a first holding unit that detachably holds the first device, the main body has a second holding unit that detachably holds the first device, the drive device is configured to move the first device from the first holding unit side to the second holding unit side when the first device held by the first holding unit of the holding device and the second holding unit of the main body are facing each other, and is configured to move the first device from the second holding unit side to the first holding unit side when the first device held by the second holding unit of the main body and the first holding unit of the holding device are facing each other. A contactless power supply device characterized in that the magnetic field generating unit of the first device and the power generating unit of the second device are configured such that power is generated from the power generating unit of the second device when the second device rotates together with the tool holder while the first device is held by the first holding unit of the main body.

2. A contactless power supply device according to claim 1, characterized in that the first holding portion has a first positioning mechanism that defines a first holding position of the first device, and the second holding portion has a second positioning mechanism that defines a second holding position of the first device.

3. A contactless power supply device according to claim 1, wherein the first device has at least one first connecting portion and at least one second connecting portion, the first holding portion has at least one first hole, the second holding portion has at least one second hole, and the first device is held by the first holding portion by the insertion of the at least one first connecting portion into the at least one first hole, or by the insertion of the at least one second connecting portion into the at least one second hole. The drive device is characterized in that the first device is held by the first holding portion, and the first device is movable such that the at least one second connecting portion is inserted into the at least one second hole when the at least one second connecting portion and the at least one second hole are facing each other, and the first device is movable such that the at least one first connecting portion is inserted into the at least one first hole when the first device is held by the second holding portion, and the at least one first connecting portion and the at least one first hole are facing each other.

4. A contactless power supply device according to claim 3, wherein the first device has a support portion that supports the magnetic field generating portion, and the at least one first connecting portion and the at least one second connecting portion constitute at least one connecting portion unit including one first connecting portion that protrudes coaxially from the support portion to one side and one second connecting portion that protrudes to the other side.

5. A contactless power supply device according to claim 4, wherein the first device has at least one connecting rod having a first portion protruding from one side of the support portion and a second portion protruding from the other side, and the first portion and the second portion of the connecting rod constitute the first connecting portion and the second connecting portion, respectively.

6. A contactless power supply device according to claim 3, characterized in that the first holding portion has a first positioning mechanism that defines a first holding position of the first connecting portion within the first hole, and the second holding portion has a second positioning mechanism that defines a second holding position of the second connecting portion within the second hole.

7. A contactless power supply device according to claim 6, wherein the first connecting portion has at least one first recess opening to the outer circumference, the second connecting portion has at least one second recess opening to the outer circumference, the first positioning mechanism has a first engaging portion that protrudes inward from the inner wall surface forming the first hole and is capable of engaging with the first recess formed in the first connecting portion inserted into the first hole, and the second positioning mechanism has a second engaging portion that protrudes inward from the inner wall surface forming the second hole and is capable of engaging with the second recess formed in the second connecting portion inserted into the second hole.

8. A contactless power supply device according to any one of claims 3 to 7, wherein the drive device has a first fluid supply passage that supplies fluid into the first hole so as to generate a driving force that moves the first connecting portion inserted into the first hole toward the second hole opposite the first hole, and a second fluid supply passage that supplies fluid into the second hole so as to generate a driving force that moves the second connecting portion inserted into the second hole toward the first hole opposite the second hole.

9. A contactless power supply device according to any one of claims 1 to 3, wherein the magnetic field generating unit of the first device is configured to generate a magnetic field using a permanent magnet, and has a magnetic field generating unit tip surface on the side facing the power generating unit of the second device, and the first device further has a cover, the cover having a tip surface cover unit that covers the magnetic field generating unit tip surface, and is configured to be relatively movable with respect to the magnetic field generating unit tip surface so that the distance between the tip surface cover unit and the magnetic field generating unit tip surface changes.

10. A contactless power supply device according to claim 9, characterized in that the cover has at least one nozzle for injecting fluid onto the front end of 11. A contactless power supply device according to claim 10, characterized in that it comprises a cover driving device that moves the cover relative to the tip surface of the magnetic field generating unit such that the distance between the tip surface of the magnetic field generating unit and the tip surface cover portion increases.

12. A contactless power supply device according to claim 11, characterized in that, while the first device is held by the first holding portion, the cover is moved relative to the tip surface of the magnetic field generating portion by the cover driving device such that the distance between the tip surface of the magnetic field generating portion and the tip surface cover portion increases, and fluid is supplied from the third fluid supply passage to the nozzle.

13. A contactless power supply device according to any one of claims 1 to 3, wherein the magnetic field generating unit of the first device is configured to generate a magnetic field by a coil, the first device has a first connection terminal connected to the coil, the second holding unit has a second connection terminal connected to a power supply, and the first connection terminal and the second connection terminal are configured such that when the first device moves from the first holding unit side to the second holding unit side, the first connection terminal and the second connection terminal are connected, and when the first device moves from the second holding unit side to the first holding unit side, the connection between the first connection terminal and the second connection terminal is released.

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