Non-contact power supply device

Abstract

A non-contact power supply device 400 that is to supply power to a tool holder 200 in a non-contact manner comprises a first device 500 that is provided to a spindle housing 150 and a second device 600 that is provided to the tool holder 200. The first device 500 has a magnetic field generation unit 510 that includes a permanent magnet 511. The second device 600 has a power generation unit that includes first, second, and third cores 610, 620, 630 and a coil 640. The first core 610 and the second core 620 are provided opposite each other in the axial direction such that pluralities of first protruding pieces 612 and second protruding pieces 622 alternate in the circumferential direction. The third core 630 is provided between the first core 610 and the second core 620 inside the first protruding pieces 612 and the second protruding pieces 622. The coil 640 is wound around the outer circumference of the third core 630.

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 for driving the actuator to the tool holder in a non-contact manner is used.

[0003] Conventionally, a non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 3-2230602 is known. Japanese Patent Application Laid-Open No. 3-2230602 discloses a non-contact power supply device composed of a first device and a second device. The first device has a permanent magnet that generates a magnetic field. The first device is attached to a spindle housing that rotatably holds the spindle. The second device has a coil that generates power. The second device is attached to the spindle. Also, the second device is disposed inside the first device. In the non-contact power supply device disclosed in Japanese Patent Application Laid-Open No. 3-2230602, when the coil rotates together with the spindle, power is generated from the coil and supplied to an electrical device built in the measurement probe.

[0004] Japanese Patent Application Laid-Open No. 3-223602

[0005] The non-contact power supply device disclosed in Japanese Patent Publication No. 3-2230602 supplies power to a measuring probe without contact and consists of a first device attached to the spindle housing and a second device attached to the spindle and positioned inside the first device. Therefore, if the non-contact power supply device disclosed in Japanese Patent Publication No. 3-2230602 is used as a non-contact power supply device to supply power to a tool holder without contact, it is necessary to significantly change the configuration of the tool holder, and it will also become larger. Accordingly, the object of this disclosure is to provide a technology that can easily and compactly configure a non-contact power supply device that supplies power to a tool holder without contact.

[0006] This disclosure relates to a non-contact power supply device for supplying power to a tool holder that rotates with a spindle rotatably supported on a main body. The non-contact power supply device of this disclosure comprises a first device provided on the main body and a second device provided on the tool holder. The first device may be fixed to the main body or detachably held on the main body. The second device comprises a first core, a second core, a third core, and a coil. The first core has a first base and a plurality of first protruding pieces. The first base extends along the outer circumference of the tool holder. Preferably, the first base extends in the circumferential and radial directions. The first protruding pieces are provided on the outer circumference side of the first base at circumferentially spaced apart and protrude from the first base in the axial direction first. The first protruding pieces extend in the axial and circumferential directions. The second core has a second base and a plurality of second projections. The second base extends along the outer circumference of the tool holder. Preferably, the second base extends in the circumferential and radial directions. The second projections are provided on the outer circumference side of the second base, spaced apart in the circumferential direction, and protrude from the second base in the second axial direction. The second projections extend in the axial and circumferential directions. Furthermore, the second core is arranged such that each second projection is located between two adjacent first projections, axially first, compared to the first core. That is, the first projections and second projections are arranged alternately along the circumferential direction. The third core has a cylindrical shape that extends along the outer circumference of the tool holder. The third core is positioned between the first base of the first core and the second base of the second core, inside the multiple first protrusions of the first core and the multiple second protrusions of the second core. The coil is wound around the outer circumference of the third core. The coil is provided with output terminals for supplying power. By configuring the second device using the first to third cores and the coil, a compact second device that efficiently generates power can be obtained. The first device has a magnetic field generating unit. The magnetic field generating unit includes a plurality of permanent magnets arranged circumferentially on the outer circumference of the second device, which is provided on a tool holder.Multiple permanent magnets are arranged in a predetermined range along the circumferential direction. The predetermined range is set within a non-interference area that does not interfere with the arm of the tool changer, for example, when the non-contact power supply device of this disclosure is applied to a machine tool having a tool changer. The non-contact power supply device of this disclosure can be easily made compact. In a different embodiment of the non-contact power supply device of this disclosure, the multiple permanent magnets are arranged with the magnetization direction of circumferentially adjacent permanent magnets rotated by 90 degrees so that the magnetic field is concentrated on the side facing the second device. In this embodiment, the magnetic field can be concentrated on the side of the magnetic field generating unit facing the second device, thereby increasing the power generated from the coil of the second device. In a different embodiment of the non-contact power supply device of this disclosure, the magnetic field generating unit has a magnetic field generating unit tip surface on the side facing the second device. The first device further has a cover. The cover is formed, for example, of resin so that magnetic flux can pass through it. The cover has a tip surface cover portion that covers the magnetic field generating unit tip surface. Furthermore, the cover is configured to be movable relative to the tip surface of the magnetic field generating unit so as to change the distance between the tip surface cover portion and the second device. The cover can be moved manually or by using a cover drive device. 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 onto the cover tip surface opposite to the tip surface of the magnetic field generating unit, and a fluid supply passage for supplying fluid to at least one nozzle. In this embodiment, chips adhering to the cover tip surface can be removed more easily by injecting fluid onto the cover tip surface. In this embodiment, chips adhering to the cover tip surface can be removed with a simple configuration.In a different embodiment of this disclosure, a cover drive device is provided that moves 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, chips adhering to the tip surface of the cover can be removed more easily.

[0007] This disclosure makes it possible to easily and compactly configure a contactless power supply device.

[0008] This is a perspective view of an example of a machine tool using a non-contact power supply device according to one embodiment. This is a cross-sectional view of the main part of Figure 1 taken from the direction of arrow II-II. This is a cross-sectional view of Figure 2 taken from the direction of arrow III-III. This is a perspective view of a second device constituting a non-contact power supply device according to one embodiment. This is an assembly diagram of the second device constituting a non-contact power supply device according to one embodiment. This is a perspective view of a first device constituting a non-contact power supply device according to one embodiment. This is a diagram showing the arrangement of permanent magnets in the first device constituting a non-contact power supply device according to one 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 a non-contact power supply device according to one embodiment. This is a cross-sectional view of the main part of the first device with the cover moved. This is a perspective view of a holding device constituting a non-contact power supply device according to one embodiment. This is a diagram illustrating the operation of holding the first device constituting a non-contact power supply device according to one embodiment in the spindle housing. This is a diagram illustrating the operation of holding the first device constituting a non-contact power supply device according to one embodiment in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes a contactless power supply device according to one embodiment, in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes a contactless power supply device according to one embodiment, in the spindle housing. This is a diagram illustrating the operation of holding the first device, which constitutes a contactless power supply device according to one embodiment, in the holding device. This is a diagram illustrating the operation of holding the first device, which constitutes a contactless power supply device according to one embodiment, in the holding device.

[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 non-contact power supply device 400 of this disclosure is incorporated into a vertical machining center 100 having an automatic tool changer (ATC). Note that the non-contact power supply device 400 of this disclosure can be incorporated into various machine tools other than vertical machining centers 100, such as transfer machines. Furthermore, the following describes a non-contact power supply device 400 in which the first device 500 is configured to be detachably held in a spindle housing 150 that rotatably supports the spindle 160.

[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 in which the first device 500 (described in detail later), which constitutes a non-contact power supply device 400 of one 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). A 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 contactless power supply device 400 of this 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 contactless power supply device 400 of this embodiment, will be described with reference to Figures 3, 6, and 10. Figure 3 is a cross-sectional view of the main part of Figure 2 as seen 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 the chips adhering to the tip surface portion 531a. 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 "fluid supply passage that supplies fluid to the fluid chamber", the "fluid supply passage that supplies fluid to the injection nozzle", or the "third fluid supply passage" in 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 527a of the first portion 526A of the connecting rod 526 constitute the "first positioning mechanism (positioning device)" 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 (positioning device)" 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 523A 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] When removing chips adhering to the cover 530, 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 device 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 permanent magnet 511 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. 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.

[0038] The present disclosure can also be configured as follows: (Aspect 1) A non-contact power supply device that supplies power in a non-contact manner 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 magnetic field generating unit is configured to generate a magnetic field using a permanent magnet, 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, and the main body has a second holding unit that detachably holds the first device. The drive device is configured to drive the first device from the first holding portion side to the second holding portion side when the first device, which is held by the first holding portion of the holding device, and the second holding portion of the main body are arranged facing each other, and is configured to drive the first device from the second holding portion side to the first holding portion side when the first device, which is held by the second holding portion of the main body, and the first holding portion of the holding device are arranged facing each other, and the magnetic field generating portion of the first device and the power generating portion of the second device are configured such that power is generated from the power generating portion of the second device when the second device rotates together with the tool holder while the first device is held by the first holding portion of the main body. (Aspect 2) A contactless power supply device according to aspect 1, wherein the first holding portion has a first positioning mechanism that defines the holding position of the first device, and the second holding portion has a second positioning mechanism that defines the holding position of the first device.(Aspect 3) A contactless power supply device according to aspect 1 or 2, 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, 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 the second holding portion is held by the second holding portion by the insertion of the at least one second connecting portion into the at least one second hole. The drive device is configured to drive the first device so that the at least one second connecting portion is inserted into the at least one second hole when the first device is held in the first holding portion and the at least one second connecting portion and the at least one second hole are arranged opposite each other, and also to drive the first device so that the at least one first connecting portion is inserted into the at least one first hole when the first device is held in the second holding portion and the at least one first connecting portion and the at least one first hole are arranged opposite each other. (Aspect 4) A contactless power supply device according to aspect 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. (Aspect 5) A contactless power supply device according to aspect 4, wherein the first device has at least one connecting rod having a first portion that protrudes to one side and a second portion that protrudes to the other side from the support portion, and the first portion and the second portion of the connecting rod constitute the first connecting portion and the second connecting portion.(Aspect 6) A contactless power supply device according to any of aspects 3 to 5, wherein the first holding portion has a first positioning mechanism that defines the holding position of the first connecting portion within the first hole, and the second holding portion has a second positioning mechanism that defines the holding position of the second connecting portion within the second hole. (Aspect 7) A contactless power supply device according to aspect 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. (Aspect 8) A contactless power supply device according to any of aspects 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 to move the first connecting portion inserted into the first hole toward the second hole opposite to the first hole, and a second fluid supply passage that supplies fluid into the second hole so as to generate a driving force to move the second connecting portion inserted into the second hole toward the first hole opposite to the second hole.

[0039] In the above embodiment, a contactless power supply device 400 comprising a first device 500 detachably attached to the spindle housing 150 and the holding device 700 has been described. However, it is also possible to configure a contactless power supply device 400 of a different embodiment comprising the first device 500 provided on the spindle housing 150. In this embodiment, the holding device 170 (holding part 171) and the holding device 700 (holding part 730) for detachably holding the first device 500, and the support part 520 for detachably holding the first device 500 to the holding device 170 (holding part 171) and the holding device 700 (holding part 730) are omitted. In addition, the magnetic field generating part 510 of the first device 500 is attached to the spindle housing 150 either directly or via a mounting part. In this embodiment, the cover 530, which is movable relative to the magnetic field generating unit 510, the cover drive device 536 for moving the cover 530, the fluid chamber 537, the fluid supply passage 538, and the nozzle 539 for spraying fluid onto the front end surface portion 531a of the cover 530 can be selected and used as appropriate. Also in this embodiment, the operation to remove chips adhering to the front end surface portion 531a of the cover 530 is performed with the first device (magnetic field generating unit 510, cover 530) attached to the spindle housing 150. Preferably, it is performed with the tool holder 200 removed from the spindle 160.

[0040] 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 that moves the holding device 700 can also be used. The magnetic field generating portion 510 of the first device 500 only needs to be able to generate power from the power generating portion of the second device 600 as the second device 600 rotates together with the tool holder 200, and is not limited to the magnetic field generating portion described in the embodiments. For example, the magnetic field generating unit 510 is configured with multiple permanent magnets 511, but it can also be configured with a single permanent magnet. Also, although the multiple permanent magnets are arranged with the magnetization directions of adjacent permanent magnets in the circumferential direction rotated by 90 degrees, the arrangement of the multiple permanent magnets is not limited to this. The power generating unit of the second device 600 is not limited to the configuration described in the embodiment. In the embodiment, an air cylinder was used as a cover drive device to move the cover 530 relative to the magnetic field generating unit 510, but the cover drive device is not limited to this. The cover 630 can also be moved manually. The cover can also be omitted. In the embodiment, a fluid injection device consisting of a fluid chamber 537, a fluid supply passage 538, and an injection port 529 was used as a fluid injection device to inject fluid into the front 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 the embodiments. The configurations for holding the first device 500 in the holding device 700 (holding portion 730) and in the holding device 170 (holding portion 171) are not limited to the configurations described in the embodiments.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.

[0041] 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, 200... Tool holder, 210... Holder body , 212...Main body outer surface, 212a...Main body outer surface portion, 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...Magnetic field generating unit tip surface, 510b, 510c...Magnetic field generating unit side surface, 510d...Magnetic field generating unit top surface, 510e...Magnetic field generating unit bottom surface, 511, 511 a-511e...Permanent magnet, 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, 530...Cover, 531...Cover tip wall, 531A...Protrusion, 531a-531c...Tip surface portion, 532, 533...Cover side wall 534...Upper wall of cover, 535...Bottom wall of cover, 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...Protruding piece, 640...Coil, 700...Holding device, 710...Base, 720...Support part, 730...Holding part, 732...End face of holding part, 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, which is rotatably supported on a main body about an axis, the device comprising: a first device provided on the main body; and a second device provided on the tool holder, the second device having a first core, a second core, a third core, and a coil, the first core having a first base extending along the outer circumference of the tool holder, and a plurality of first protruding pieces provided at circumferentially spaced locations on the outer circumference side of the first base, and protruding from the first base in the first axial direction, The second core has a second base extending along the outer circumference of the tool holder, and a plurality of second protruding pieces provided at circumferentially spaced locations on the outer circumference side of the second base and projecting from the second base in a second axial direction, and each of the second protruding pieces is arranged between two adjacent first protruding pieces, axially first side of the first core, the third core has a cylindrical shape extending along the outer circumference of the tool holder and is arranged between the first base and the second base, inside the plurality of first protruding pieces and the plurality of second protruding pieces, the coil is wound around the outer circumference of the third core, the first device has a magnetic field generating unit, and the magnetic field generating unit includes a plurality of permanent magnets arranged in the circumferential direction in a predetermined range along the circumferential direction on the outer circumference side of the second device provided on the tool holder.

2. A contactless power supply device according to claim 1, characterized in that the plurality of permanent magnets are arranged such that the magnetization direction of adjacent permanent magnets in the circumferential direction is rotated by 90 degrees so that the magnetic field is concentrated on the side facing the second device.

3. A contactless power supply device according to claim 1 or 2, wherein the magnetic field generating unit has a magnetic field generating unit tip surface on the side facing the second device, the first device further has a cover, the cover has a tip surface cover portion 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 such that the distance between the tip surface cover portion and the second device changes.

4. A contactless power supply device according to claim 3, wherein the cover has at least one injection port for injecting fluid onto the front end of 5. A contactless power supply device according to claim 4, 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.

Images