Tool rest and machine tool

Abstract

A tool rest includes: a mounting portion (41) which has a first surface (510) and a second surface (520) having a level difference from the first surface (510), and has a recess (530) which is recessed from the first surface (510) and in which the second surface (520) is disposed at a bottom; a tool holder (200) having a first contact (220A) and a second contact (220B) which are electrical contacts, and mounted on the mounting portion (41); a first terminal (140A) disposed in the second surface (520) and connected with the first contact (220A) of the tool holder (200); and a second terminal (140B) disposed in the second surface (520) and connected with the second contact (220B) of the tool holder (200).

Description

TOOL REST AND MACHINE TOOL

[0001] The present invention relates to a tool rest and a machine tool.

[0002] For example, Japanese Patent Laying-Open No. 2021-35717 (PTL 1) discloses a tool holder module that can be mounted on a tool holder turret. The tool holder module includes: a support body detachably attachable to the tool holder turret for supporting a tool that can be driven by the tool holder module; and a smart device detachably attachable to the support body for obtaining data about the tool holder module and communicating with a cloud computing system.

[0003] The smart device has a SIM card for communicating with the cloud computing system through a cellular communication network, and a battery for supplying power.

[0004] Further, Japanese Patent Laying-Open No. 2020-40202 (PTL 2) discloses a tool holder for a turret lathe, the tool holder including: a servo motor for positioning a seat of a tool at a predetermined angular position; a transmission / reception module for communicating with an external source through a Wi-Fi, near field communication (NFC), or Bluetooth network, and transmitting a drive signal to the servo motor; and a battery for supplying power to the servo motor and the transmission / reception module.

[0005] [PTL 1] Japanese Patent Laying-Open No. 2021-35717 [PTL 2] Japanese Patent Laying-Open No. 2020-40202

[0006] A tool rest on which a tool holder for holding a tool is mounted is known. The tool holder may be equipped with various sensors such as a proximity sensor, a temperature sensor, or an acceleration sensor, and / or an actuator such as a motor for rotating a tool such as a drill or swiveling the tool to change the orientation of the tool.

[0007] In order to communicate a signal between such a sensor and / or actuator and the outside, and to supply power to the sensor and / or actuator, it is conceivable to provide the tool rest with a terminal that forms an electrical contact with the tool holder. In this case, if the tool holder is mounted on the tool rest with chips adhering to the terminal, reliability of communication may be impaired, or power supply may not be appropriately performed.

[0008] An object of the present invention is to provide a tool rest that allows easy removal of chips adhering to a terminal, and a machine tool including such a tool rest.

[0009] A tool rest according to an aspect of the present invention includes: a mounting portion which has a first surface and a second surface having a level difference from the first surface, and has a recess which is recessed from the first surface and in which the second surface is disposed at a bottom; a tool holder having a first contact and a second contact which are electrical contacts, and mounted on the mounting portion; a first terminal disposed in the second surface and connected with the first contact of the tool holder; and a second terminal disposed in the second surface and connected with the second contact of the tool holder.

[0010] A tool rest according to another aspect of the present invention includes a mounting portion which has a first surface and a second surface having a level difference from the first surface, and in which a tool holder can be mounted on the first surface. The mounting portion is provided with a recess which is recessed from the first surface, is opened toward one direction along the second surface, and in which the second surface is disposed at a bottom. The tool rest further incudes a terminal that is disposed in the second surface and forms an electrical contact with the tool holder.

[0011] A machine tool according to the present invention includes the tool rest described above.

[0012] According to the present invention, it is possible to provide a tool rest that allows easy removal of chips adhering to a terminal, and a machine tool including such a tool rest.

[0013] Fig. 1 is a perspective view showing a tool rest in a first embodiment of the present invention.Fig. 2 is a front view showing the tool rest in Fig. 1.Fig. 3 is a cross sectional view showing the tool rest in Fig. 1.Fig. 4 is a perspective view showing a reversal holder (at a position of 0°).Fig. 5 is a perspective view showing the reversal holder (at a position of 180°).Fig. 6 is a perspective view showing a bottom portion of the reversal holder.Fig. 7 is a cross sectional view showing an internal structure of the reversal holder in Fig. 4.Fig. 8 is an enlarged cross sectional view of a part of the tool rest in Fig. 3.Fig. 9 is a cross sectional view schematically showing a rotary connector in Fig. 8.Fig. 10 is a cross sectional view showing the tool rest as viewed in a direction of arrows on a line X-X in Fig. 3.Fig. 11 is another enlarged cross sectional view of a part of the tool rest in Fig. 3.Fig. 12 is an enlarged perspective view of the tool rest in a range surrounded by a two-dot chain line XII in Fig. 1.Fig. 13 is a cross sectional view showing the tool rest as viewed in a direction of arrows on a line XIII-XIII in Fig. 12.Fig. 14 is a cross sectional view showing a mounted state of a second tool holder (reversal holder) on a mounting portion.Fig. 15 is an enlarged cross sectional view of a range surrounded by a two-dot chain line XV in Fig. 14.Fig. 16 is a cross sectional view showing a mounted state of a first tool holder on the mounting portion.Fig. 17 is a block diagram showing an electrical structure of the reversal holder in the first embodiment of the present invention.Fig. 18 is a block diagram showing a modification of the electrical structure of the reversal holder in Fig. 17.Fig. 19 is a front view showing a machine tool using a jig in a second embodiment of the present invention.Fig. 20 is a block diagram showing an electrical structure of the jig in Fig. 19.Fig. 21 is a block diagram showing a machine tool in an embodiment of the present invention.Fig. 22 is a block diagram showing a control system for screen display on a display unit in Fig. 21.Fig. 23 is a view showing a first application screen on the display unit in Fig. 21.Fig. 24 is a view showing a second application screen on the display unit in Fig. 21.Fig. 25 is another view showing the second application screen on the display unit in Fig. 21.Fig. 26 is still another view showing the second application screen on the display unit in Fig. 21.Fig. 27 is a flowchart showing a flow of control of display on the display unit by a control device in Fig. 22.Fig. 28 is a perspective view showing a machine tool.

[0014] Embodiments of the present invention will be described with reference to the drawings. It should be noted that, in the drawings referred to below, the same or corresponding members will be designated by the same reference numerals.

[0015] (First Embodiment) <Overall Structure of Tool Rest> Fig. 1 is a perspective view showing a tool rest in a first embodiment of the present invention. Fig. 2 is a front view showing the tool rest in Fig. 1. Fig. 3 is a cross sectional view showing the tool rest in Fig. 1.

[0016] Referring to Figs. 1 to 3, a tool rest 100 is a device for holding a tool, and is included in a machine tool.

[0017] As a representative example, the machine tool is a lathe that performs workpiece machining (turning) by bringing a tool into contact with a rotating workpiece. The machine tool has tool rest 100, and a workpiece spindle for rotating a workpiece. Tool rest 100 has a milling function for performing workpiece machining by bringing a rotating tool into contact with a stationary workpiece.

[0018] As another example, the machine tool may be a composite machining machine further having a tool spindle for rotating a tool, in addition to tool rest 100 and the workpiece spindle described above.

[0019] The machine tool is a numerically controlled (NC) machine tool in which various operations for workpiece machining are automated by numerical control using a computer.

[0020] Tool rest 100 is provided in a machining area of the machine tool. The machining area is a space in which workpiece machining is performed, and is sealed by a cover body such that foreign matter such as chips or a coolant resulting from workpiece machining does not leak to the outside of the machining area.

[0021] Tool rest 100 is configured to hold a plurality of tools. Tool rest 100 is a turret-type tool rest that moves the held plurality of tools in a circumferential direction of a swivel central axis 110, and indexes a tool used for machining. Swivel central axis 110 extends parallel to a rotation central axis of a workpiece in the machine tool.

[0022] Tool rest 100 has a base 12, a support body 61, a built-in motor 66, and a swivel body (turret) 21.

[0023] Base 12 is supported by a bed of the machine tool. Support body 61 is connected to base 12. Built-in motor 66 can output rotation about a rotation central axis 120. Rotation central axis 120 is orthogonal to swivel central axis 110. Built-in motor 66 is a milling motor for rotating a tool held by a tool holder 210 described later, and is built in tool rest 100.

[0024] Swivel body 21 extends in a cylindrical shape about swivel central axis 110. Swivel body 21 is supported by support body 61 so as to be swivelable about swivel central axis 110. Rotation is transmitted from a motor (not shown) mounted on base 12 to swivel body 21, and thereby swivel body 21 swivels about swivel central axis 110.

[0025] Support body 61 has a motor housing 62 and an intermediate housing 67. Motor housing 62 supports built-in motor 66. A stator of built-in motor 66 is fixed to motor housing 62. A rotor of built-in motor 66 is supported by motor housing 62 via a bearing (not shown). Motor housing 62 is connected to one end portion (a front end portion) of intermediate housing 67 in an axial direction of swivel central axis 110.

[0026] Intermediate housing 67 has a cylindrical shape and extends about swivel central axis 110. Intermediate housing 67 is disposed between motor housing 62 and base 12 in the axial direction of swivel central axis 110. Base 12 is connected to the other end portion (a rear end portion) of intermediate housing 67 in the axial direction of swivel central axis 110.

[0027] Support body 61 further has a cylindrical portion 71. Cylindrical portion 71 has a shape of a cylinder centered on swivel central axis 110. Cylindrical portion 71 is connected to one end portion of motor housing 62 in the axial direction of swivel central axis 110. Motor housing 62 is disposed between cylindrical portion 71 and intermediate housing 67 in the axial direction of swivel central axis 110.

[0028] Swivel body 21 defines a first internal space 191. Swivel body 21 as a whole has a shape of a hollow disc centered on swivel central axis 110. First internal space 191 is formed inside swivel body 21. Motor housing 62 and intermediate housing 67 are disposed in first internal space 191.

[0029] Swivel body 21 has a plurality of mounting portions 41. As an example, swivel body 21 has twelve mounting portions 41. The plurality of mounting portions 41 are arranged in the circumferential direction of swivel central axis 110. The plurality of mounting portions 41 are arranged at equal intervals in the circumferential direction of swivel central axis 110. The plurality of mounting portions 41 form a shape of a ring centered on swivel central axis 110. Motor housing 62 (built-in motor 66) is disposed inside the plurality of mounting portions 41.

[0030] Tool holder 210 is mounted on mounting portion 41. Tool holder 210 can hold a tool. Tool holder 210 is fastened to mounting portion 41 using a bolt or the like. Tool holder 210 may include a built-in rotation transmission mechanism for transmitting the rotation outputted from built-in motor 66 to the tool. Tool holder 210 may include a built-in clamping mechanism for clamping and unclamping the tool at the time of automatic exchange of the tool held by tool holder 210.

[0031] Tool holder 210 is classified into a first tool holder 210S and a second tool holder 210T, from the viewpoint of the presence or absence of an electrical contact with tool rest 100. First tool holder 210S cannot form an electrical contact with tool rest 100. Second tool holder 210T has a holder-side terminal 220 (see Fig. 6 described later), and can form an electrical contact with tool rest 100 via holder-side terminal 220.

[0032] Swivel body 21 further has a flange portion 32 and a housing portion 34. Flange portion 32, housing portion 34, and the plurality of mounting portions 41 are integrally formed of metal. The plurality of mounting portions 41 are disposed between flange portion 32 and housing portion 34 in the axial direction of swivel central axis 110.

[0033] Flange portion 32 widens in a flange shape about swivel central axis 110. Flange portion 32 is provided between cylindrical portion 71 and the plurality of mounting portions 41 in a radial direction of swivel central axis 110. Flange portion 32 is provided between a rotary connector 81 described later and the plurality of mounting portions 41 in the radial direction of swivel central axis 110. Flange portion 32 faces motor housing 62 in the axial direction of swivel central axis 110.

[0034] Flange portion 32 has a disc portion 32p and a tapered portion 32q. Disc portion 32p as a whole has a shape of a disc in which the axial direction of swivel central axis 110 corresponds to a thickness direction. Disc portion 32p is provided at a position away from the plurality of mounting portions 41 in the axial direction of swivel central axis 110. Tapered portion 32q has a shape of a tapered cylinder extending about swivel central axis 110 while changing the diameter centered on swivel central axis 110. An end portion of tapered portion 32q on a small diameter side is connected to an outer circumferential edge of disc portion 32p. An end portion of tapered portion 32q on a large diameter side is connected to the plurality of mounting portions 41.

[0035] Flange portion 32 is fitted onto an outer circumference of cylindrical portion 71. When swivel body 21 swivels, flange portion 32 swivels about swivel central axis 110 while sliding with respect to cylindrical portion 71. Flange portion 32 is supported by cylindrical portion 71 so as to be swivelable about swivel central axis 110.

[0036] Housing portion 34 as a whole has a shape of a cylinder centered on swivel central axis 110. One end portion of housing portion 34 in the axial direction of swivel central axis 110 is connected to the plurality of mounting portions 41. Housing portion 34 is disposed on an outer circumference of intermediate housing 67. A bearing 68 is interposed between housing portion 34 and intermediate housing 67.

[0037] Swivel body 21 further has a cover portion 36. Cover portion 36 is detachably attached to flange portion 32 (disc portion 32p). Cover portion 36 is fastened to flange portion 32 (disc portion 32p) using a bolt or the like. Cover portion 36 defines a second internal space 192, together with flange portion 32 (disc portion 32p). Rotary connector 81 described later is disposed in second internal space 192.

[0038] As shown in Fig. 8 described later, flange portion 32 has a first flange surface 32a and a second flange surface 32b. First flange surface 32a is formed of a plane orthogonal to swivel central axis 110. First flange surface 32a is disposed in second internal space 192. First flange surface 32a faces cover portion 36 with a spacing therebetween in the axial direction of swivel central axis 110. Second flange surface 32b is disposed on a back side of first flange surface 32a. Second flange surface 32b is formed of a plane orthogonal to the axial direction of swivel central axis 110. Second flange surface 32b is disposed in first internal space 191. Second flange surface 32b faces motor housing 62 with a spacing therebetween in the axial direction of swivel central axis 110.

[0039] Cover portion 36 has a shape in which it extends in a cylindrical shape about swivel central axis 110, and one end portion of cover portion 36 in the axial direction of swivel central axis 110 is closed. The other end portion of cover portion 36 in the axial direction of swivel central axis 110 abuts on flange portion 32 (disc portion 32p). Cover portion 36 is provided to one end portion (a front end portion) of tool rest 100 in the axial direction of swivel central axis 110.

[0040] Tool rest 100 further has rotary connector 81. Rotary connector 81 is provided along swivel central axis 110. Rotary connector 81 is provided inside cylindrical portion 71. It should be noted that the structure of rotary connector 81 will be described later in detail.

[0041] <Basic Structure of Second Tool Holder (Reversal Holder)> Fig. 4 is a perspective view showing a reversal holder (at a position of 0°). Fig. 5 is a perspective view showing the reversal holder (at a position of 180°). Fig. 6 is a perspective view showing a bottom portion of the reversal holder. Fig. 7 is a cross sectional view showing an internal structure of the reversal holder in Fig. 4.

[0042] Referring to Figs. 4 to 7, these drawings show a reversal holder 200 including a reversal mechanism for changing the orientation of a tool T by 180°, as an example of second tool holder 210T that can form an electrical contact with tool rest 100.

[0043] Reversal holder 200 has a holder main body 310. Holder main body 310 can hold tool T. As an example, tool T is a turning tool having a shaft portion 301 and a blade portion 302. Shaft portion 301 has a shape of a shaft extending in one direction. One end portion of shaft portion 301 is held by holder main body 310. Shaft portion 301 extends in a radial direction of a swivel central axis 150 described later. Blade portion 302 is formed of a throw-away tip, and is attached to the other end portion of shaft portion 301.

[0044] Holder main body 310 has a support portion 326 and a swivel portion 321. Support portion 326 is a portion fixed to mounting portion 41 in tool rest 100. Swivel portion 321 is supported by support portion 326 so as to be swivelable about swivel central axis 150. Swivel central axis 150 extends in a direction of a tangent to an arc centered on swivel central axis 110 of tool rest 100. Tool T (shaft portion 301) is held by swivel portion 321.

[0045] Reversal holder 200 further has a rotation input key 331, a shaft 332, a first bevel gear 336, and a second bevel gear 337. Shaft 332 extends along a rotation central axis 160. An axial direction of rotation central axis 160 corresponds to the radial direction of swivel central axis 110 of tool rest 100. Shaft 332 is supported by support portion 326 so as to be rotatable about rotation central axis 160.

[0046] Rotation input key 331 is connected to one end portion of shaft 332 in the axial direction of rotation central axis 160. First bevel gear 336 is connected to the other end portion of shaft 332 in the axial direction of rotation central axis 160. When reversal holder 200 is mounted on mounting portion 41 of tool rest 100, rotation input key 331 is coupled to the rotor of built-in motor 66 built in tool rest 100. As the rotation from built-in motor 66 is inputted to rotation input key 331, shaft 332 rotates about rotation central axis 160 together with first bevel gear 336.

[0047] Second bevel gear 337 meshes with first bevel gear 336. Second bevel gear 337 is supported so as to be rotatable about swivel central axis 150. Second bevel gear 337 is rotatable about swivel central axis 150 integrally with swivel portion 321. As rotation of first bevel gear 336 is transmitted to second bevel gear 337, swivel portion 321 swivels about swivel central axis 150.

[0048] Swivel portion 321 can be swiveled between the position of 0° shown in Fig. 4 and the position of 180° shown in Fig. 5. The orientation of tool T held by reversal holder 200 (the orientation of blade portion 302) is reversed between the position of 0° shown in Fig. 4 and the position of 180° shown in Fig. 5. Tool T faces one direction along the axial direction of swivel central axis 110 of tool rest 100 at the position of 0° shown in Fig. 4, and faces the other direction along the axial direction of swivel central axis 110 of tool rest 100 at the position of 180° shown in Fig. 5.

[0049] Reversal holder 200 includes a locking mechanism for fixing swivel portion 321 at the position of 0° shown in Fig. 4 and the position of 180° shown in Fig. 5. Hereinafter, the locking mechanism will be described.

[0050] As shown in Fig. 7, swivel portion 321 has a sleeve 322. Sleeve 322 is provided at a position away from second bevel gear 337 on a radially outer side of swivel central axis 150. Sleeve 322 has a shape of a cylinder extending in the radial direction of swivel central axis 150. Sleeve 322 is provided to cover shaft portion 301 of tool T.

[0051] Reversal holder 200 has a locking piece 371 (371A, 371B). Locking piece 371 is provided to support portion 326. Locking piece 371 is supported by support portion 326 so as to be slidable in the axial direction of swivel central axis 110 of tool rest 100. Locking piece 371A and locking piece 371B are provided to have a spacing therebetween in the axial direction of swivel central axis 110 of tool rest 100. Shaft 332 is disposed between locking piece 371A and locking piece 371B in the axial direction of swivel central axis 110 of tool rest 100.

[0052] Reversal holder 200 further has a spring member 366 and a piston cylinder 361 (361A, 361B).

[0053] Spring member 366 is provided to support portion 326. Spring member 366 is interposed between locking piece 371A and locking piece 371B in the axial direction of swivel central axis 110 of tool rest 100. Spring member 366 exerts, on locking piece 371, an elastic force in a direction which is the axial direction of swivel central axis 110 and in which locking piece 371A and locking piece 371B move away from each other.

[0054] Piston cylinder 361 is provided to support portion 326. Piston cylinder 361 is an air cylinder driven by air supplied thereto. Piston cylinder 361A and piston cylinder 361B are provided apart from each other in the axial direction of swivel central axis 110 of tool rest 100. Locking piece 371A is provided between spring member 366 and piston cylinder 361A in the axial direction of swivel central axis 110. Locking piece 371B is provided between spring member 366 and piston cylinder 361B in the axial direction of swivel central axis 110.

[0055] Locking piece 371 has a claw portion 376. Claw portion 376 has a shape of a claw that protrudes in the axial direction of swivel central axis 110 of tool rest 100 and can lock an edge portion of sleeve 322. Claw portion 376 of locking piece 371A faces the edge portion of sleeve 322 when swivel portion 321 is positioned at the position of 0°, in the axial direction of swivel central axis 110. Claw portion 376 of locking piece 371B faces the edge portion of sleeve 322 when swivel portion 321 is positioned at the position of 180°, in the axial direction of swivel central axis 110.

[0056] By receiving the elastic force of spring member 366, locking piece 371 slides in a direction in which claw portion 376 moves closer to the edge portion of sleeve 322. When swivel portion 321 is positioned at the position of 0°, claw portion 376 of locking piece 371A is locked to the edge portion of sleeve 322, and thereby swivel portion 321 is locked at the position of 0°. When swivel portion 321 is positioned at the position of 180°, claw portion 376 of locking piece 371B is locked to the edge portion of sleeve 322, and thereby swivel portion 321 is locked at the position of 180°.

[0057] By supplying air to piston cylinder 361, piston cylinder 361A pushes locking piece 371A toward locking piece 371B while resisting the elastic force of spring member 366, and at the same time, piston cylinder 361B pushes locking piece 371B toward locking piece 371A while resisting the elastic force of spring member 366. Thereby, locking piece 371A and locking piece 371B slide in directions in which they move closer to each other, in the axial direction of swivel central axis 110 of tool rest 100. When swivel portion 321 is positioned at the position of 0°, claw portion 376 of locking piece 371A is spaced apart from the edge portion of sleeve 322, and locking of swivel portion 321 by locking piece 371A is released. When swivel portion 321 is positioned at the position of 180°, claw portion 376 of locking piece 371B is spaced apart from the edge portion of sleeve 322, and locking of swivel portion 321 by locking piece 371B is released.

[0058] Reversal holder 200 further has a proximity sensor 381 (381A, 381B) and an in-holder substrate 410. Proximity sensor 381 is provided to support portion 326. Proximity sensor 381 is provided as a sensor for detecting a locked state and an unlocked state of swivel portion 321. In-holder substrate 410 is provided to support portion 326. In-holder substrate 410 is attached to support portion 326. Proximity sensor 381 outputs a detection signal for locking piece 371 to in-holder substrate 410. In-holder substrate 410 outputs a signal and power for driving to proximity sensor 381.

[0059] Proximity sensor 381A is intended for sensing of locking piece 371A, and is provided to face locking piece 371A in the axial direction of swivel central axis 110. Proximity sensor 381B is intended for sensing of locking piece 371B, and is provided to face locking piece 371B in the axial direction of swivel central axis 110. Proximity sensor 381A can detect locking and unlocking of swivel portion 321 by locking piece 371A. Proximity sensor 381B can detect locking and unlocking of swivel portion 321 by locking piece 371B.

[0060] As shown in Figs. 6 and 7, holder main body 310 has a base portion 320 and a block 341. Base portion 320 is configured to include swivel portion 321 and support portion 326 described above, and can hold tool T. Base portion 320 (support portion 326) has a bottom surface 320c. Bottom surface 320c is in surface contact with a first surface 510 of mounting portion 41, which will be described later. Rotation input key 331 is provided at a position protruding from bottom surface 320c.

[0061] Base portion 320 (support portion 326) further has a plurality of positioning pins 327. Positioning pin 327 has a shape of a pin protruding from bottom surface 320c. The plurality of positioning pins 327 are provided to have a spacing therebetween in a surface direction of bottom surface 320c. In a front view of bottom surface 320c, rotation input key 331 is provided at a position surrounded by the plurality of positioning pins 327.

[0062] Block 341 is detachably attached to holder main body 310. Block 341 is fastened to holder main body 310 (support portion 326) using a bolt or the like. Block 341 is provided to protrude from bottom surface 320c. Block 341 is provided between two positioning pins 327 adjacent to each other in the axial direction of swivel central axis 150. In the front view of bottom surface 320c, block 341 is provided side by side with rotation input key 331 in the axial direction of swivel central axis 110 of tool rest 100.

[0063] Reversal holder 200 further has holder-side terminal 220 (220A, 220B). When reversal holder 200 is mounted on mounting portion 41, holder-side terminal 220 forms an electrical contact with tool rest 100.

[0064] Holder-side terminal 220 (220A, 220B) is provided to block 341. Block 341 is provided with a terminal hole 346 (346A, 346B). Terminal hole 346 is formed of a through hole penetrating block 341 in the axial direction of rotation central axis 160. Holder-side terminal 220 is disposed in terminal hole 346. Holder-side terminal 220A and holder-side terminal 220B are disposed in terminal hole 346A and terminal hole 346B, respectively.

[0065] Base portion 320 (support portion 326) is provided with an air hole 342. Air hole 342 is open at a position adjacent to block 341, and extends toward piston cylinder 361 (361A, 361B). Air is supplied from mounting portion 41 to reversal holder 200. The air is supplied to piston cylinder 361 (361A, 361B) through air hole 342 and a pipe (not shown).

[0066] <Wiring and Piping Structure in Tool Rest> Fig. 8 is an enlarged cross sectional view of a part of the tool rest in Fig. 3. Fig. 9 is a cross sectional view schematically showing the rotary connector in Fig. 8. Fig. 10 is a cross sectional view showing the tool rest as viewed in a direction of arrows on a line X-X in Fig. 3.

[0067] Referring to Fig. 3 and Figs. 8 to 10, tool rest 100 further has a plurality of turret-side terminals 140 (140A, 140B). The plurality of turret-side terminals 140 are provided to the plurality of mounting portions 41, respectively.

[0068] When reversal holder 200 is mounted on mounting portion 41, turret-side terminal 140 forms an electrical contact with reversal holder 200. When reversal holder 200 is mounted on mounting portion 41, turret-side terminal 140A is connected with holder-side terminal 220A in reversal holder 200 in Fig. 6, and turret-side terminal 140B is connected with holder-side terminal 220B in reversal holder 200 in Fig. 6.

[0069] As shown in Fig. 9, rotary connector 81 has a movable portion 82 and a fixed portion 83. Movable portion 82 is a movable-side component that can swivel about swivel central axis 110 together with swivel body 21. Movable portion 82 has a rotary shaft 86 and a drum 84. Rotary shaft 86 extends axially along swivel central axis 110. Drum 84 has a shape of a cylinder centered on swivel central axis 110, and is fitted onto an outer circumference of rotary shaft 86. A plurality of conduction bands 85 are provided on an outer circumferential surface of drum 84. Conduction band 85 is made of metal. Conduction band 85 has a shape of a ring extending in the circumferential direction of swivel central axis 110. The plurality of conduction bands 85 are provided to have a spacing therebetween in the axial direction of swivel central axis 110.

[0070] Fixed portion 83 is fixed to support body 61. Fixed portion 83 is detachably attached to cylindrical portion 71. Fixed portion 83 is fastened to cylindrical portion 71 using a bolt or the like. Fixed portion 83 is a fixed-side component that does not swivel integrally with swivel body 21. Fixed portion 83 is configured to form an electrical contact with movable portion 82. More specifically, fixed portion 83 has a housing 87 and a plurality of brushes 88. Housing 87 has a shape of a cylinder centered on swivel central axis 110, and is provided on an outer circumference of drum 84. Housing 87 supports rotary shaft 86 so as to be rotatable about swivel central axis 110. The plurality of brushes 88 are supported by housing 87. The plurality of brushes 88 are provided to have a spacing therebetween in the axial direction of swivel central axis 110. Brush 88 is formed of a metal wire body. Brush 88 extends from housing 87 and abuts on conduction band 85.

[0071] Tool rest 100 further has a fixed-side wire 130J and a movable-side wire 130K. Fixed-side wire 130J and movable-side wire 130K are routed inside tool rest 100. Fixed-side wire 130J and movable-side wire 130K are not exposed in the machining area of the machine tool.

[0072] Fixed-side wire 130J is connected to fixed portion 83. Fixed-side wire 130J is electrically connected to the plurality of brushes 88 in fixed portion 83. Movable-side wire 130K extends between movable portion 82 and the plurality of turret-side terminals 140. Movable-side wire 130K is electrically connected to the plurality of conduction bands 85 in movable portion 82. Rotary connector 81 relays fixed-side wire 130J and movable-side wire 130K.

[0073] As shown in Figs. 3 and 8, fixed-side wire 130J passes through the inside of base 12 and intermediate housing 67 from the outside of tool rest 100, and extends in the axial direction of swivel central axis 110. Motor housing 62 is provided with a wire hole 63. Wire hole 63 is formed of a through hole penetrating motor housing 62 in the axial direction of swivel central axis 110. Fixed-side wire 130J passing through the inside of intermediate housing 67 passes through wire hole 63 and extends to first internal space 191 between flange portion 32 and motor housing 62. Fixed-side wire 130J extending to first internal space 191 is connected to fixed portion 83 (the plurality of brushes 88).

[0074] Rotary connector 81 is provided across both first internal space 191 and second internal space 192. One end portion (a front end portion) of rotary connector 81 in the axial direction of swivel central axis 110 is disposed in second internal space 192. Rotary connector 81 is attachable to and detachable from cylindrical portion 71 through second internal space 192.

[0075] As shown in Figs. 8 to 10, movable-side wire 130K from movable portion 82 (the plurality of conduction bands 85) extends to second internal space 192.

[0076] Tool rest 100 further has a relay connector 430 (430A, 430B). Relay connector 430 is disposed in second internal space 192. Relay connector 430 is attached to first flange surface 32a. Relay connector 430A and relay connector 430B are provided to have a spacing therebetween in the circumferential direction of swivel central axis 110. Movable-side wire 130K from movable portion 82 is connected to relay connector 430. Relay connector 430 relays movable-side wire 130K in second internal space 192.

[0077] Flange portion 32 is provided with a wire hole 35. Wire hole 35 is formed of a through hole penetrating flange portion 32 between first flange surface 32a and second flange surface 32b. Wire hole 35 extends from first flange surface 32a toward second flange surface 32b while shifting toward a radially outer side of swivel central axis 110. Movable-side wire 130K from relay connector 430 is disposed in wire hole 35. Movable-side wire 130K extends to first internal space 191 through wire hole 35.

[0078] Wire hole 35 is open in first flange surface 32a at an angular position between relay connector 430A and relay connector 430B in the circumferential direction of swivel central axis 110. Movable-side wire 130K from movable portion 82 is firstly routed from a radially inner side toward the radially outer side of swivel central axis 110. A part of movable-side wire 130K extends in one direction along the circumferential direction of swivel central axis 110, and reaches wire hole 35 via relay connector 430A. The remaining part of movable-side wire 130K extends in the other direction along the circumferential direction of swivel central axis 110, and reaches wire hole 35 via relay connector 430B.

[0079] Relay connector 430 has a first connector portion 431 and a second connector portion 432. First connector portion 431 and second connector portion 432 are detachably connected to each other. Movable-side wire 130K from rotary connector 81 (movable portion 82) is connected to first connector portion 431. Movable-side wire 130K extending toward turret-side terminal 140 is connected to second connector portion 432.

[0080] As shown in Fig. 8, tool rest 100 further has a plurality of in-turret substrates 420. The plurality of in-turret substrates 420 are disposed in first internal space 191. The plurality of in-turret substrates 420 are attached to second flange surface 32b. The plurality of in-turret substrates 420 are provided to have a spacing therebetween in the circumferential direction of swivel central axis 110. The plurality of in-turret substrates 420 are provided corresponding to the plurality of mounting portions 41 (the plurality of turret-side terminals 140). Movable-side wire 130K from wire hole 35 is connected to the plurality of in-turret substrates 420.

[0081] It should be noted that one in-turret substrate 420 having functions of the plurality of in-turret substrates 420 integrated therein may be attached to second flange surface 32b.

[0082] Movable-side wire 130K from each in-turret substrate 420 is connected to turret-side terminal 140 provided to each mounting portion 41.

[0083] Fig. 11 is another enlarged cross sectional view of a part of the tool rest in Fig. 3. The cross sectional view in Fig. 11 shows tool rest 100 at a position different from that in the cross sectional view in Fig. 8.

[0084] Referring to Figs. 2, 3, and 11, an air groove 561 is provided between cylindrical portion 71 and flange portion 32 in the radial direction of swivel central axis 110. Air groove 561 extends annularly in the circumferential direction of swivel central axis 110. Air groove 561 is configured as a combination of a groove portion which is recessed from an outer circumferential surface of cylindrical portion 71 and extends about swivel central axis 110 and a groove portion which is recessed from an inner circumferential surface of flange portion 32 and extends about swivel central axis 110.

[0085] Tool rest 100 further has a seal member 571 and a seal member 572. Each of seal member 571 and seal member 572 extends annularly in the circumferential direction of swivel central axis 110. Each of seal member 571 and seal member 572 is provided at a boundary portion between cylindrical portion 71 and flange portion 32 in the radial direction of swivel central axis 110. Air groove 561 is disposed between seal member 571 and seal member 572 in the axial direction of swivel central axis 110.

[0086] Flange portion 32 is further provided with a plurality of air holes 562. The plurality of air holes 562 extend radially about swivel central axis 110, from air groove 561 toward the plurality of mounting portions 41. The plurality of air holes 562 are provided to have a spacing therebetween in the circumferential direction of swivel central axis 110. Each air hole 562 extends from the radially inner side toward the radially outer side of swivel central axis 110. Each air hole 562 is provided across disc portion 32p and tapered portion 32q in the radial direction of swivel central axis 110. One end portion of air hole 562 on the radially inner side of swivel central axis 110 communicates with air groove 561. The other end portion of air hole 562 on the radially outer side of swivel central axis 110 communicates with an air hole 551 described later.

[0087] The plurality of mounting portions 41 are provided with a plurality of air holes 551, respectively. Air hole 551 is open in a second surface 520 of mounting portion 41, which will be described later. Air hole 551 extends in a direction orthogonal to second surface 520. Air hole 551 extends between air hole 562 and second surface 520. Air hole 551 is provided across a block 43 and a base portion 42 of mounting portion 41, which will be described later.

[0088] In a state where reversal holder 200 is mounted on mounting portion 41, air hole 551 communicates with air hole 342 (see Figs. 6 and 7) provided to reversal holder 200. As shown in Fig. 12 described later, mounting portion 41 (block 43) is provided with a seal member 552. Seal member 552 has a ring shape. Seal member 552 is provided to surround an opening surface of air hole 551 in second surface 520. Seal member 552 seals an air flow path between air hole 551 and air hole 342.

[0089] An air pipe (not shown) to which air is supplied from the outside is connected to a rear end portion of motor housing 62. Motor housing 62 and cylindrical portion 71 are provided with an air hole (not shown) for guiding the air from the air pipe to air groove 561. While flowing through air groove 561, the air flows into air hole 562 connected to mounting portion 41 on which reversal holder 200 is mounted. The air flowing through air hole 562 passes through air hole 551 and air hole 342 in this order, and is supplied to piston cylinder 361 (361A, 361B).

[0090] The structure of tool rest 100 in the first embodiment of the present invention mainly described in this section will be summarized. Tool rest 100 in the present embodiment includes: support body 61; swivel body 21 having the plurality of mounting portions 41 which are arranged in the circumferential direction of swivel central axis 110 as a predetermined axis and on each of which reversal holder 200 as a tool holder can be mounted, swivel body 21 being supported by support body 61 so as to be swivelable about swivel central axis 110; rotary connector 81 having movable portion 82 which swivels about swivel central axis 110 together with swivel body 21, and fixed portion 83 which is fixed to support body 61 and forms an electrical contact with movable portion 82, rotary connector 81 being provided along swivel central axis 110; turret-side terminal 140 as a terminal which is provided to mounting portion 41 and forms an electrical contact with reversal holder 200; fixed-side wire 130J which is routed inside tool rest 100 and is connected to fixed portion 83; and movable-side wire 130K which is routed inside tool rest 100 and extends between movable portion 82 and turret-side terminal 140.

[0091] With such a configuration, an electrical path including fixed-side wire 130J, rotary connector 81, movable-side wire 130K, and turret-side terminal 140 can be formed inside tool rest 100. Thereby, communication with reversal holder 200 can be performed by wire, and thus reliability of communication can be improved. Further, power supply to reversal holder 200 can be performed by wire, and thus there is no need to mount a battery on reversal holder 200, and reversal holder 200 can be downsized.

[0092] As a result, it is possible to implement tool rest 100 that can improve reliability of communication and downsize reversal holder 200, in utilizing electricity in reversal holder 200.

[0093] Further, swivel body 21 has flange portion 32 provided between rotary connector 81 and the plurality of mounting portions 41 in the radial direction of swivel central axis 110, and cover portion 36 which is detachably attached to flange portion 32 and defines, together with flange portion 32, second internal space 192 as an internal space in which rotary connector 81 is disposed.

[0094] With such a configuration, an operator can access rotary connector 81 by removing cover portion 36 from flange portion 32. Thereby, workability during maintenance of rotary connector 81 can be improved.

[0095] Further, movable-side wire 130K from movable portion 82 extends to second internal space 192. Flange portion 32 has first flange surface 32a disposed in second internal space 192. Tool rest 100 further includes relay connector 430 which is attached to first flange surface 32a and relays movable-side wire 130K in second internal space 192.

[0096] With such a configuration, in relay connector 430, movable-side wire 130K extending from rotary connector 81 (movable portion 82) can be separated from movable-side wire 130K extending toward turret-side terminal 140. Thereby, workability during maintenance of rotary connector 81 can be further improved.

[0097] Further, flange portion 32 further has second flange surface 32b disposed on the back side of first flange surface 32a. Flange portion 32 is provided with wire hole 35 which is formed of a through hole extending between first flange surface 32a and second flange surface 32b and in which movable-side wire 130K from relay connector 430 is disposed. Tool rest 100 further includes in-turret substrate 420 as a substrate which is attached to second flange surface 32b and to which movable-side wire 130K from wire hole 35 is connected.

[0098] With such a configuration, by utilizing second flange surface 32b of flange portion 32 as a surface for attaching the substrate, in-turret substrate 420 can be provided on a path of movable-side wire 130K between relay connector 430 and turret-side terminal 140.

[0099] Further, support body 61 has cylindrical portion 71 having a shape of a cylinder centered on swivel central axis 110. Rotary connector 81 is disposed inside cylindrical portion 71. Swivel body 21 further has flange portion 32 which is fitted onto the outer circumference of cylindrical portion 71, swivels about swivel central axis 110 while sliding with respect to cylindrical portion 71, and is provided between cylindrical portion 71 and the plurality of mounting portions 41 in the radial direction of swivel central axis 110. Between cylindrical portion 71 and flange portion 32 in the radial direction of swivel central axis 110, air groove 561 is provided as a fluid groove which extends in the circumferential direction of swivel central axis 110 and to which air as a fluid is supplied. Flange portion 32 is provided with air holes 562 as a plurality of fluid holes which extend radially about swivel central axis 110, from air groove 561 toward the plurality of mounting portions 41, and through which the air from air groove 561 flows.

[0100] With such a configuration, an electrical path constituted by rotary connector 81 is formed on the radially inner side of swivel central axis 110 with respect to cylindrical portion 71, and an air flow path constituted by air groove 561 and the plurality of air holes 562 is formed on the radially outer side of swivel central axis 110 with respect to cylindrical portion 71. Thereby, the electrical path and the air flow path to mounting portion 41 can be provided compactly in the axial direction of swivel central axis 110.

[0101] It should be noted that, although the present embodiment has described a case where a fluid flowing through the fluid groove and the plurality of fluid holes in the present invention is air supplied to piston cylinder 361, the fluid is not limited thereto. For example, the fluid in the present invention may be oil for operating a clamping mechanism for the tool mounted on the tool holder, air for sensing clamping of the tool using air pressure, air for checking seating of the tool holder on the mounting portion (first surface 510 described later), or a coolant discharged toward a blade edge of the tool. The fluid groove and the plurality of fluid holes in the present invention may form a pair, and a plurality of the pairs may be provided to have a spacing therebetween in the axial direction of the predetermined axis, to form a plurality of fluid flow paths.

[0102] <Structure of Mounting Portion (Turret Side Terminal) in Tool Rest> Fig. 12 is an enlarged perspective view of the tool rest in a range surrounded by a two-dot chain line XII in Fig. 1. Fig. 13 is a cross sectional view showing the tool rest as viewed in a direction of arrows on a line XIII-XIII in Fig. 12.

[0103] It should be noted that, although Fig. 13 as well as Figs. 14 to 16 described later representatively show turret-side terminal 140A and / or holder-side terminal 220A, turret-side terminal 140A and turret-side terminal 140B have the same structure, and holder-side terminal 220A and holder-side terminal 220B have the same structure, except for the number of pins. The number of pins in turret-side terminal 140A and holder-side terminal 220A is larger than the number of pins in turret-side terminal 140B and holder-side terminal 220B.

[0104] Referring to Figs. 2, 8, 12, and 13, mounting portion 41 has first surface 510 and second surface 520.

[0105] Each of first surface 510 and second surface 520 is a plane orthogonal to the radial direction of swivel central axis 110. Each of first surface 510 and second surface 520 faces the radially outer side of swivel central axis 110. First surface 510 extends along a side of a regular polygon (a regular dodecagon) centered on swivel central axis 110 when viewed in the axial direction of swivel central axis 110. Second surface 520 has a level difference from first surface 510. Second surface 520 is disposed on the radially inner side of swivel central axis 110 than first surface 510.

[0106] Each tool holder 210 of first tool holder 210S and second tool holder 210T is mounted on first surface 510. Bottom surface 320c (see Figs. 6 and 7) of reversal holder 200 as second tool holder 210T is in surface contact with first surface 510. Mounting portion 41 is provided with a plurality of pin insertion holes 49. Pin insertion hole 49 extends in a direction orthogonal to first surface 510 and is open in first surface 510. When reversal holder 200 is mounted on mounting portion 41, the plurality of positioning pins 327 in Figs. 6 and 7 are inserted into the plurality of pin insertion holes 49, respectively, and thereby reversal holder 200 is positioned with respect to mounting portion 41.

[0107] Mounting portion 41 is further provided with a recess 530. Recess 530 has a recessed shape recessed from first surface 510. The direction orthogonal to first surface 510 (the radial direction of swivel central axis 110) corresponds to a depth direction of recess 530. Second surface 520 is disposed at the bottom of recess 530. Second surface 520 corresponds to a bottom surface of recess 530. Recess 530 is opened toward one direction along second surface 520. Recess 530 is opened toward one direction along the axial direction of swivel central axis 110.

[0108] Second surface 520 (the bottom surface of recess 530) is surrounded by a wall portion formed by mounting portion 41, in the other direction along the axial direction of swivel central axis 110, one direction along the direction of the tangent to the arc centered on swivel central axis 110, and the other direction along the direction of the tangent to the arc centered on swivel central axis 110.

[0109] Turret-side terminal 140 is disposed in second surface 520. Turret-side terminal 140 is provided to protrude from second surface 520. Mounting portion 41 is further provided with a terminal hole 44 (44A, 44B). Terminal hole 44 is open in second surface 520. Terminal hole 44 extends in a direction orthogonal to second surface 520 and communicates with first internal space 191. Turret-side terminal 140 is disposed in terminal hole 44. Turret-side terminal 140A and turret-side terminal 140B are disposed in terminal hole 44A and terminal hole 44B, respectively.

[0110] Mounting portion 41 has base portion 42 and block 43. Base portion 42 has first surface 510. Flange portion 32, housing portion 34, and base portion 42 are integrally formed of metal. Tool holder 210 is mounted on base portion 42. Block 43 has second surface 520. Block 43 is a metal block separate from base portion 42. Block 43 is detachably attached to base portion 42. Block 43 is fastened to base portion 42 using a bolt or the like.

[0111] Terminal hole 44 is provided across block 43 and base portion 42. Turret-side terminal 140 is disposed in terminal hole 44 provided to block 43. Movable-side wire 130K from in-turret substrate 420 extends to turret-side terminal 140 through terminal hole 44 provided to base portion 42 and block 43.

[0112] Base portion 42 is provided with a block disposition groove 540. Block disposition groove 540 has a recessed shape recessed from first surface 510. Block disposition groove 540 is opened toward one direction along the axial direction of swivel central axis 110. As shown in Fig. 8, base portion 42 has a bottom surface 525. Bottom surface 525 is disposed at the bottom of block disposition groove 540. A depth Hb of block disposition groove 540 from first surface 510 (a length between first surface 510 and bottom surface 525 in the radial direction of swivel central axis 110) is larger than a depth Ha of recess 530 from first surface 510 (a length between first surface 510 and second surface 520 in the radial direction of swivel central axis 110) (Hb > Ha).

[0113] Block 43 is disposed in block disposition groove 540. Block 43 has a shape of a rectangular parallelepiped in which second surface 520 is a top surface. Second surface 520 is disposed between first surface 510 and bottom surface 525 of block disposition groove 540. Second surface 520 is provided at a position closer to first surface 510 than to bottom surface 525 in the radial direction of swivel central axis 110. Depth Ha of recess 530 may be in a range of 1 / 20 times or more and 1 / 3 times or less depth Hb of block disposition groove 540 (1 / 20×Hb ≦ Ha ≦ 1 / 3×Hb). Depth Ha of recess 530 may be in a range of 1 / 15 times or more and 1 / 5 times or less depth Hb of block disposition groove 540 (1 / 15×Hb ≦ Ha ≦ 1 / 5×Hb). Depth Ha of recess 530 may be in a range of 1 / 100 times or more and 1 / 10 times or less a length Hc between swivel central axis 110 and first surface 510 in the radial direction of swivel central axis 110 (1 / 100×Hc ≦ Ha ≦ 1 / 10×Hc). Depth Ha of recess 530 may be in a range of 1 / 50 times or more and 1 / 20 times or less length Hc between swivel central axis 110 and first surface 510 in the radial direction of swivel central axis 110 (1 / 50×Hc ≦ Ha ≦ 1 / 20×Hc). Depth Ha of recess 530 may be in a range of 5 mm or more and 50 mm or less (5 mm ≦ Ha ≦ 50 mm), or in a range of 10 mm or more and 30 mm or less (10 mm ≦ Ha ≦ 30 mm).

[0114] It should be noted that, when block 43 is removed from base portion 42, block disposition groove 540 may be utilized as a space for avoiding interference between base portion 42 and a tool protruding from first tool holder 210S.

[0115] Tool rest 100 further has a seal member 45. Seal member 45 has a ring shape. Mounting portion 41 (block 43) is further provided with a seal groove 570. Seal groove 570 has a shape of a groove recessed from second surface 520 and extending along an opening edge of terminal hole 44. Seal member 45 is disposed in seal groove 570. Seal member 45 is provided to extend along an outer circumferential surface of turret-side terminal 140. Seal member 45 seals a space in which an electrical contact formed between turret-side terminal 140 and holder-side terminal 220 is disposed.

[0116] Referring to Figs. 1 to 3, either one tool holder 210 of first tool holder 210S and second tool holder 210T can be selectively mounted on each mounting portion 41. In the drawings, second tool holder 210T (reversal holder 200) is mounted on one mounting portion 41, and first tool holders 210S are mounted on the remaining eleven mounting portions 41.

[0117] Tool rest 100 further has a lid 91. Lid 91 is attached to mounting portion 41 on which first tool holder 210S is mounted. Lid 91 is not attached to mounting portion 41 on which second tool holder 210T (reversal holder 200) is mounted.

[0118] Fig. 14 is a cross sectional view showing a mounted state of the second tool holder (reversal holder) on the mounting portion. Fig. 15 is an enlarged cross sectional view of a range surrounded by a two-dot chain line XV in Fig. 14.

[0119] Referring to Figs. 14 and 15, in mounting portion 41 on which second tool holder 210T (reversal holder 200) is mounted, turret-side terminal 140 is exposed at second surface 520, because lid 91 is not attached.

[0120] In the state where reversal holder 200 is mounted on mounting portion 41, block 341 is fitted into recess 530. Bottom surface 320c of base portion 320 is in surface contact with first surface 510. Block 341 is in surface contact with second surface 520. Block 341 abuts on seal member 45.

[0121] Turret-side terminal 140 has a resin portion 47 and a plurality of pins 46. Resin portion 47 has a top surface 47a. Top surface 47a faces holder-side terminal 220 with a gap therebetween. Resin portion 47 is provided with a plurality of pin holes 48. The plurality of pin holes 48 are open in top surface 47a with a spacing therebetween. The plurality of pins 46 are disposed in the plurality of pin holes 48, respectively. The plurality of pins 46 are integrally held by resin portion 47. Pin 46 has a shape of a pin extending in one direction. Pin 46 is made of metal.

[0122] Turret-side terminal 140 is provided to protrude from second surface 520. Turret-side terminal 140 is provided not to protrude from first surface 510. Top surface 47a is located between first surface 510 and second surface 520 in the depth direction of recess 530.

[0123] Holder-side terminal 220 has a resin portion 221 and a plurality of pin components 222. Resin portion 221 corresponds to resin portion 47 in turret-side terminal 140, and the plurality of pin components 222 correspond to the plurality of pins 46 in turret-side terminal 140. The plurality of pin components 222 are integrally held by resin portion 221. The plurality of pin components 222 contact the plurality of pins 46, respectively, thereby forming an electrical contact between holder-side terminal 220 and turret-side terminal 140.

[0124] The structures of turret-side terminal 140 and holder-side terminal 220 will be more specifically described. Pin 46 has a tip portion 46a. Tip portion 46a is disposed at a position deeper in pin hole 48 than an opening surface of pin hole 48 in top surface 47a. The size of a level difference between top surface 47a and tip portion 46a is preferably 0.1 mm or more, and more preferably 0.2 mm or more.

[0125] Pin component 222 has a support portion 225, a contactor 223, and a spring member 224. Resin portion 221 covers support portion 225. Contactor 223 has a shape of a pin extending in a predetermined direction. Contactor 223 is made of metal. Contactor 223 is supported by support portion 225 so as to be slidable along the predetermined direction. One end portion (a tip portion) of contactor 223 protrudes from support portion 225. The tip portion of contactor 223 has a curved surface and is in contact with pin 46 (tip portion 46a) of turret-side terminal 140. A wire 135 is connected to the other end portion of contactor 223. Contactor 223 is electrically connected with in-holder substrate 410 (see Fig. 7) by wire 135.

[0126] Spring member 224 is provided to support portion 225. Spring member 224 applies an elastic force in a direction which is parallel to the predetermined direction and in which contactor 223 is pushed toward pin 46. When reversal holder 200 is mounted on mounting portion 41, contactor 223 is pushed into support portion 225 by pin 46 while resisting the elastic force of spring member 224. With such a configuration, it is possible to sufficiently ensure contact pressure between pin component 222 and pin 46, and enhance reliability of the electrical contact between holder-side terminal 220 and turret-side terminal 140.

[0127] Fig. 16 is a cross sectional view showing a mounted state of the first tool holder on the mounting portion. Referring to Fig. 16, in mounting portion 41 on which first tool holder 210S is mounted, turret-side terminal 140 is not exposed at second surface 520, because lid 91 is attached.

[0128] Lid 91 is detachably attached to second surface 520. Lid 91 is disposed in recess 530. Lid 91 is detachably attached to block 43. Lid 91 is fastened to block 43 using a bolt or the like. Lid 91 is provided to cover turret-side terminal 140 protruding from second surface 520. Lid 91 abuts on seal member 45. Lid 91 is provided to close air hole 551 (see Figs. 11 and 12) that is open in second surface 520. Lid 91 abuts on seal member 552 (see Figs. 11 and 12).

[0129] Lid 91 is formed of a plate material in which the depth direction of recess 530 corresponds to a thickness direction, and which has a rectangular shape corresponding to second surface 520 when viewed in the depth direction of recess 530. Lid 91 has a thickness smaller than the level difference formed between first surface 510 and second surface 520. Lid 91 has a top surface 91a. Top surface 91a is disposed between first surface 510 and second surface 520 in the depth direction of recess 530.

[0130] First tool holder 210S is mounted on first surface 510. A gap is provided between first tool holder 210S and lid 91.

[0131] The structure of tool rest 100 in the first embodiment of the present invention mainly described in this section will be summarized. Tool rest 100 in the present embodiment includes: mounting portion 41 which has first surface 510 and second surface 520 having a level difference from first surface 510, and has recess 530 which is recessed from first surface 510 and in which second surface 520 is disposed at a bottom; reversal holder 200 as a tool holder having holder-side terminal 220A as a first contact and holder-side terminal 220B as a second contact which are electrical contacts, and mounted on mounting portion 41; turret-side terminal 140A as a first terminal disposed in second surface 520 and connected with holder-side terminal 220A of reversal holder 200; and turret-side terminal 140B as a second terminal disposed in second surface 520 and connected with holder-side terminal 220B of reversal holder 200.

[0132] Further, tool rest 100 includes mounting portion 41 which has first surface 510 and second surface 520 having a level difference from first surface 510, and in which reversal holder 200 as a tool holder can be mounted on first surface 510. Mounting portion 41 is provided with recess 530 which is recessed from first surface 510, is opened toward one direction along second surface 520, and in which second surface 520 is disposed at a bottom. Tool rest 100 further includes turret-side terminal 140 as a terminal that is disposed in second surface 520 and forms an electrical contact with reversal holder 200.

[0133] In such a configuration, since recess 530 is recessed from first surface 510, chips are likely to accumulate on second surface 520 disposed at the bottom of recess 530. In this case, since recess 530 is opened toward one direction along second surface 520, the operator can easily remove chips that are accumulated on second surface 520 and adhere to turret-side terminal 140, through the opened position. Thereby, it is possible to prevent tool holder 210 from being mounted on mounting portion 41 with chips adhering to turret-side terminal 140.

[0134] Further, tool rest 100 includes swivel body 21 that has the plurality of mounting portions 41 arranged in the circumferential direction of swivel central axis 110 as a predetermined axis, and can swivel about swivel central axis 110. The one direction in which recess 530 is opened corresponds to the axial direction of swivel central axis 110.

[0135] With such a configuration, in turret-type tool rest 100, the operator can easily remove chips accumulated on second surface 520, through the opened position of recess 530 opened toward the axial direction of swivel central axis 110.

[0136] Further, tool rest 100 further includes lid 91 detachably attached to second surface 520 and disposed in recess 530. Lid 91 has a thickness smaller than the level difference formed between first surface 510 and second surface 520.

[0137] With such a configuration, when first tool holder 210S that cannot form an electrical contact with tool rest 100 is mounted on mounting portion 41, it is possible to prevent foreign matter such as chips or a coolant from adhering to turret-side terminal 140 by attaching lid 91 to second surface 520.

[0138] Further, mounting portion 41 includes base portion 42 which has first surface 510 and on which reversal holder 200 is mounted, and block 43 which has second surface 520 and is detachably attached to base portion 42. Turret-side terminal 140 is provided to block 43.

[0139] With such a configuration, by attaching block 43 to base portion 42, it is possible to change the specification from a tool rest in which only first tool holder 210S can be mounted to tool rest 100 in which either one tool holder 210 of first tool holder 210S and second tool holder 210T can be selectively mounted.

[0140] Further, turret-side terminal 140 includes resin portion 47 provided with the plurality of pin holes 48, and the plurality of pins 46 made of metal that are disposed in the plurality of pin holes 48, respectively, and are integrally held by resin portion 47. Pins 46 has tip portion 46a. Resin portion 47 has top surface 47a in which the plurality of pin holes 48 are open. Tip portion 46a is disposed at a position deeper in pin hole 48 than an opening surface of pin hole 48 in top surface 47a.

[0141] With such a configuration, it is possible to suppress unintended conduction between tip portion 46a of pin 46 and a conductor such as chips present in a space above top surface 47a of resin portion 47.

[0142] The machine tool in the present embodiment includes tool rest 100. With such a configuration, it is possible to implement a machine tool that allows easy removal of chips adhering to turret-side terminal 140 in tool rest 100.

[0143] <Electrical Structure of Tool Holder (Reversal Holder)> Fig. 17 is a block diagram showing an electrical structure of the reversal holder in the first embodiment of the present invention.

[0144] Referring to Fig. 17, reversal holder 200 as a tool holder in the present embodiment is mounted on tool rest 100 as a machine tool main body, and can hold a tool. Reversal holder 200 includes: proximity sensor 381 (381A, 381B) as a sensor and / or an actuator; in-holder substrate 410 as a substrate on which a first electronic circuit 721 is mounted, first electronic circuit 721 being an electronic circuit capable of converting an electrical signal from proximity sensor 381 (381A, 381B) into a digital signal that can be serially transmitted; holder-side terminal 220A as a serial terminal for forming an electrical contact with tool rest 100 and serially transmitting the digital signal; and holder-side terminal 220B as a power supply terminal for forming an electrical contact with tool rest 100 and supplying power to proximity sensor 381 (381A, 381B).

[0145] More specifically, four pin components 222 of the plurality of pin components 222 of holder-side terminal 220A in Fig. 14 are responsible for transmitting and receiving signals to and from proximity sensor 381 (381A, 381B). The signal transmitted to proximity sensor 381 may include a signal that commands an operation of proximity sensor 381. The signal received from proximity sensor 381 may include a detection signal for locking and a detection signal for unlocking of swivel portion 321. The remaining pin components 222 of the plurality of pin components 222 of holder-side terminal 220A may be utilized for grounding proximity sensor 381.

[0146] Two pin components 222 of the plurality of pin components 222 of holder-side terminal 220B are responsible for supplying power to proximity sensor 381 (381A, 381B).

[0147] First electronic circuit 721 is mounted on in-holder substrate 410. First electronic circuit 721 functions as an analog-to-digital (A / D) conversion circuit for converting an analog electrical signal outputted from proximity sensor 381 (381A, 381B) into a digital signal that can be serially transmitted. First electronic circuit 721 may function as a circuit for converting a digital electrical signal outputted from proximity sensor 381 into a digital signal that can be serially transmitted.

[0148] Tool rest 100 includes turret-side terminal 140A for serially transmitting a digital signal, and turret-side terminal 140B for supplying power to proximity sensor 381 (381A, 381B). When reversal holder 200 is mounted on tool rest 100, turret-side terminal 140A and holder-side terminal 220A are connected to each other, thereby forming an electrical contact for serially transmitting a digital signal between tool rest 100 and reversal holder 200. Turret-side terminal 140B and holder-side terminal 220B are connected to each other, thereby forming an electrical contact for transmitting power from tool rest 100 toward reversal holder 200.

[0149] With such a configuration, first electronic circuit 721 in in-holder substrate 410 converts an electrical signal from proximity sensor 381 (381A, 381B) into a digital signal that can be serially transmitted, and holder-side terminal 220A forms an electrical contact with tool rest 100 and thereby serially transmits the digital signal from in-holder substrate 410 toward tool rest 100. Thus, it is possible to ensure a sufficient amount of communication that can be simultaneously performed between reversal holder 200 and tool rest 100. Further, since holder-side terminal 220B forms an electrical contact with tool rest 100, power can be supplied to proximity sensor 381 by wire. Thereby, there is no need to install a battery in reversal holder 200, and reversal holder 200 can be downsized.

[0150] As a result, it is possible to downsize reversal holder 200 while ensuring a sufficient amount of communication, in utilizing electricity in reversal holder 200.

[0151] It should be noted that reversal holder 200 may further include a temperature sensor 911 and an acceleration sensor 912 that will be described in a third embodiment. In-holder substrate 410 may further include a second electronic circuit 722 capable of converting an electrical signal from temperature sensor 911 into a digital signal that can be serially transmitted, and a third electronic circuit 723 capable of converting an electrical signal from acceleration sensor 912 into a digital signal that can be serially transmitted.

[0152] Referring to Fig. 6, reversal holder 200 further includes base portion 320 that can hold a tool, and block 341 detachably attached to base portion 320 and provided with holder-side terminal 220A and holder-side terminal 220B.

[0153] With such a configuration, since block 341 can be removed from base portion 320, workability during cleaning or maintenance of holder-side terminals 220A and holder-side terminals 220B can be improved.

[0154] Fig. 18 is a block diagram showing a modification of the electrical structure of the reversal holder in Fig. 17. Referring to Fig. 18, a reversal holder 200D in the present modification further has an actuator 711.

[0155] Actuator 711 is a motor for swiveling swivel portion 321 instead of built-in motor 66 in Fig. 3, and is built in reversal holder 200D. Reversal holder 200D is not provided with a mechanism for transmitting rotation from built-in motor 66 to swivel portion 321 (such as rotation input key 331, shaft 332, first bevel gear 336, and second bevel gear 337 in Fig. 7), but is provided instead with a mechanism for transmitting rotation outputted from actuator 711 to swivel portion 321.

[0156] In-holder substrate 410 further includes a fourth electronic circuit 724. Fourth electronic circuit 724 functions as an analog-to-digital (A / D) conversion circuit for converting an analog electrical signal outputted from actuator 711 into a digital signal that can be serially transmitted. Fourth electronic circuit 724 may function as a circuit for converting a digital electrical signal outputted from actuator 711 into a digital signal that can be serially transmitted.

[0157] Holder-side terminal 220A is provided as a serial terminal for forming an electrical contact with tool rest 100 and serially transmitting the digital signal from in-holder substrate 410. Holder-side terminal 220B is provided as a power supply terminal for supplying power to proximity sensor 381 (381A, 381B) and actuator 711.

[0158] A signal transmitted to actuator 711 may include a signal that commands an operation of actuator 711. A signal received from actuator 711 may include a feedback signal from an encoder of a motor.

[0159] It should be noted that, when piston cylinder 361 includes an electromagnetic valve for controlling a flow of air supplied to piston cylinder 361 in Fig. 7, actuator 711 may be piston cylinder 361 including the electromagnetic valve.

[0160] The machine tool main body in the present invention is a component of the machine tool that performs workpiece machining. The machine tool main body is not limited to the tool rest, and may be a tool spindle or a table, for example. The tool held by the tool holder in the present invention is not limited to a tool for performing workpiece machining, and may be a measuring instrument (touch probe) for measuring the shape of a workpiece, for example.

[0161] (Second Embodiment) <Electrical Structure of Jig> Fig. 19 is a front view showing a machine tool using a jig in a second embodiment of the present invention. Fig. 20 is a block diagram showing an electrical structure of the jig in Fig. 19.

[0162] The present embodiment will describe a case where the electrical structure of reversal holder 200 in the first embodiment is applied to a jig 800 for holding a workpiece. Accordingly, the electrical structure of jig 800 in the present embodiment is basically the same as the electrical structure of reversal holder 200 in the first embodiment. Hereinafter, the description of the same components will not be repeated.

[0163] Referring to Figs. 19 and 20, jig 800 in the present embodiment is mounted on tool rest 100 as a turret-type tool rest, and can hold a workpiece W.

[0164] A machine tool 760 is a composite machining machine having tool rest 100, a workpiece spindle 860, and a tool spindle (not shown). Workpiece W is held by workpiece spindle 860. Workpiece spindle 860 rotates workpiece W about a rotation central axis 880. Workpiece W is formed of an elongated body in which an axial direction of rotation central axis 880 corresponds to a longitudinal direction. The tool spindle (not shown) is disposed to face workpiece spindle 860 in the axial direction of rotation central axis 880. Workpiece W is machined by rotating workpiece W and bringing a tool held by the tool spindle into contact with workpiece W.

[0165] Jig 800 is mounted on tool rest 100. Jig 800 holds workpiece W at a position away from workpiece spindle 860 in the axial direction of rotation central axis 880. Jig 800 functions as a vibration prevention device that prevents vibration of workpiece W.

[0166] Jig 800 has a pair of arms 810 that hold workpiece W by rollers, an actuator 820 that operates by hydraulic pressure and pivots the pair of arms 810 according to the diameter of workpiece W, and a proximity sensor 830 that detects a pivot position of the pair of arms 810.

[0167] Jig 800 has a substrate 840 corresponding to in-holder substrate 410 in Fig. 17, a serial terminal 850A corresponding to holder-side terminal 220A in Fig. 17, and a power supply terminal 850B corresponding to holder-side terminal 220B in Fig. 17. A first electronic circuit 841 and a second electronic circuit 842 are mounted on substrate 840. First electronic circuit 841 functions as an analog-to-digital (A / D) conversion circuit for converting an analog electrical signal outputted from actuator 820 into a digital signal that can be serially transmitted. Second electronic circuit 842 functions as an analog-to-digital (A / D) conversion circuit for converting an analog electrical signal outputted from proximity sensor 830 into a digital signal that can be serially transmitted.

[0168] The structure of jig 800 in the second embodiment of the present invention described above will be summarized. Jig 800 in the present embodiment is mounted on turret-type tool rest 100, and can hold a workpiece. Jig 800 includes: proximity sensor 830 and actuator 820 as a sensor and / or an actuator; substrate 840 on which first electronic circuit 841 and second electronic circuit 842 are mounted, first electronic circuit 841 and second electronic circuit 842 being capable of converting electrical signals from proximity sensor 830 and actuator 820 into digital signals that can be serially transmitted; serial terminal 850A for forming an electrical contact with tool rest 100 and serially transmitting the digital signals; and power supply terminal 850B for forming an electrical contact with tool rest 100 and supplying power to proximity sensor 830 and actuator 820.

[0169] Tool rest 100 includes turret-side terminal 140A for serially transmitting a digital signal, and turret-side terminal 140B for supplying power to actuator 820 and proximity sensor 830. When jig 800 is mounted on tool rest 100, turret-side terminal 140A and serial terminal 850A are connected to each other, thereby forming an electrical contact for serially transmitting a digital signal between tool rest 100 and jig 800. Turret-side terminal 140B and power supply terminal 850B are connected to each other, thereby forming an electrical contact for transmitting power from tool rest 100 toward jig 800.

[0170] With such a configuration, it is possible to downsize jig 800 while ensuring a sufficient amount of communication, in utilizing electricity in jig 800, for the same reason as that for reversal holder 200 described above.

[0171] (Third Embodiment) <Screen Display of Signal from Tool Holder> Fig. 21 is a block diagram showing a machine tool in an embodiment of the present invention. A machine tool 900 in the present embodiment includes tool rest 100 and reversal holder 200 described in the first embodiment. Hereinafter, the description of the components of tool rest 100 and reversal holder 200 in the first embodiment will not be repeated.

[0172] Referring to Fig. 21, machine tool 900 has proximity sensor 381, temperature sensor 911, and acceleration sensor 912, as sensors S.

[0173] Proximity sensor 381, temperature sensor 911, and acceleration sensor 912 are provided to reversal holder 200. Temperature sensor 911 detects temperature of reversal holder 200 that rises in association with workpiece machining by tool T. Acceleration sensor 912 detects vibration of reversal holder 200 generated in association with workpiece machining by tool T.

[0174] The type of sensor S provided to reversal holder 200 is not particularly limited, and for example, a strain sensor for detecting a cutting force generated in association with workpiece machining by tool T may be provided to reversal holder 200.

[0175] For simplicity, it is assumed that tool rest 100 has four mounting portions 41 referred to as a station 1, a station 2, a station 3, and a station 4, as the plurality of mounting portions 41. Reversal holders 200 mounted on station 1, station 2, station 3, and station 4 are referred to as a reversal holder 200-1, a reversal holder 200-2, a reversal holder 200-3, and a reversal holder 200-4, respectively.

[0176] Branch numbers "-1", "-2", "-3", and "-4" attached to each of proximity sensor 381, temperature sensor 911, and acceleration sensor 912 correspond to branch numbers of reversal holder 200-1, reversal holder 200-2, reversal holder 200-3, and reversal holder 200-4, respectively. For example, a temperature sensor 911-3 is temperature sensor 911 provided to reversal holder 200-3.

[0177] Machine tool 900 further has a control panel 920 and an operation panel 930. Control panel 920 is device equipped with an electrical control device and an electrical device for controlling machine tool 900. Operation panel 930 has an operation unit 931 that receives various operations for machine tool 900, and a display unit 932 that displays various types of information related to machining. Operation unit 931 is constituted by various buttons that can be pressed, numeric keys for inputting numeric characters, dials, and the like. Display unit 932 is constituted by a touch panel display that can be operated by the operator, and is responsible for a part of the function of the operation unit.

[0178] In-holder substrate 410 receives signals from proximity sensor 381 (381-1, 2, 3, 4), temperature sensor 911 (911-1, 2, 3, 4), and acceleration sensor 912 (912-1, 2, 3, 4). In-holder substrate 410 receives a transmission command to transmit a sensor signal, from control panel 920, and selectively transmits a part of the signals from proximity sensor 381 (381-1, 2, 3, 4), temperature sensor 911 (911-1, 2, 3, 4), and acceleration sensor 912 (912-1, 2, 3, 4) to control panel 920, according to the command.

[0179] In-turret substrate 420 controls power supply to reversal holder 200. In-turret substrate 420 may include a safety circuit for protecting a power supply system when a contact failure occurs between movable portion 82 and fixed portion 83 in rotary connector 81 in Fig. 8, or when a contact failure occurs between turret-side terminal 140 and holder-side terminal 220 in Fig. 14.

[0180] Fig. 22 is a block diagram showing a control system for screen display on the display unit in Fig. 21. Fig. 23 is a view showing a first application screen on the display unit in Fig. 21. Figs. 24 to 26 are views showing a second application screen on the display unit in Fig. 21.

[0181] Referring to Figs. 21 to 26, machine tool 900 has a control device 950. Each component of control device 950 is implemented by hardware including an arithmetic unit such as a central processing unit (CPU) and various computer processors, a storage device such as a memory or a storage, and a wired or wireless communication line connecting them, and software that is stored in the storage device and supplies a processing instruction to the arithmetic unit. Computer programs constituting the software may be constituted by a device driver, an operating system, various application programs located at an upper layer of the device driver and the operating system, or a library providing a common function to these programs. The computer programs may be recorded in a computer-readable storage medium, or may be recorded in a non-transitory computer-readable storage medium. The computer programs may be included in a computer program product.

[0182] Each component of control device 950 described below indicates a block of a functional unit. Typically, each component of control device 950 is provided to control panel 920 and operation panel 930.

[0183] Control device 950 controls machine tool 900. Control device 950 has a communication unit 960, a signal monitoring unit 966, a display control unit 970, a storage unit 980, and an operation receiving unit 990.

[0184] Communication unit 960 processes communication of the signals of proximity sensor 381, temperature sensor 911, and acceleration sensor 912. Signal monitoring unit 966 monitors the signals of proximity sensor 381, temperature sensor 911, and acceleration sensor 912.

[0185] Display control unit 970 controls image display on display unit 932. Storage unit 980 stores the signals of proximity sensor 381, temperature sensor 911, and acceleration sensor 912. Operation receiving unit 990 receives an operation of the operator through display unit 932 constituted by the touch panel display. Operation receiving unit 990 outputs a signal according to the operation of the operator on display unit 932 to communication unit 960 and / or display control unit 970.

[0186] Proximity sensor 381 (381-1, 2, 3, 4), temperature sensor 911 (911-1, 2, 3, 4) and acceleration sensor 912 (912-1, 2, 3, 4) in reversal holder 200 (200-1, 2, 3, 4) constitute a first sensor group Sa.

[0187] Communication unit 960 has a transmission command unit 962 and a signal acquisition unit 961. The operator performs an operation for selecting sensors S constituting a second sensor group Sb from sensors S constituting first sensor group Sa, through display unit 932 constituted by the touch panel display. Sensors S constituting second sensor group Sb are a part of sensors S constituting first sensor group Sa. Operation receiving unit 990 receives the operation of the operator on display unit 932, and outputs a signal specifying each sensor S constituting second sensor group Sb to transmission command unit 962.

[0188] Transmission command unit 962 outputs a transmission command to transmit a signal of sensor S constituting second sensor group Sb, to in-holder substrate 410, based on the signal from operation receiving unit 990. In-holder substrate 410 receives the transmission command from transmission command unit 962, and transmits a signal received from sensor S constituting second sensor group Sb, to control device 950. In-holder substrate 410 does not transmit a signal from sensor S that constitutes first sensor group Sa but does not constitute second sensor group Sb, to control device 950.

[0189] The transmission interval of the signal from sensor S is predetermined. The transmission interval of the signal from sensor S may vary depending on the type of sensor S, and for example, the transmission interval of a signal from temperature sensor 911 may be 1 / 1000 seconds, and the transmission interval of a signal from proximity sensor 381 may be 1 second. When sensor S constitutes second sensor group Sb, in-holder substrate 410 continuously performs transmission of the signal of sensor S at the predetermined interval, and when sensor S does not constitute second sensor group Sb, in-holder substrate 410 stops transmission of the signal of sensor S.

[0190] Signal acquisition unit 961 acquires the signal of sensor S constituting second sensor group Sb transmitted by in-holder substrate 410. Signal acquisition unit 961 outputs the acquired signal of sensor S constituting second sensor group Sb to storage unit 980, signal monitoring unit 966, and display control unit 970.

[0191] Storage unit 980 stores the signal of sensor S constituting second sensor group Sb for a predetermined time (for example, 24 hours). Signal monitoring unit 966 monitors whether or not the value of the signal of sensor S constituting second sensor group Sb exceeds a predetermined threshold value. When signal monitoring unit 966 determines that the value of a signal of specific sensor S exceeds the threshold value, signal monitoring unit 966 outputs a signal indicating occurrence of an abnormality to display control unit 970.

[0192] Display control unit 970 has a first image control unit 971, a second image control unit 972, and an operation image control unit 973.

[0193] As shown in Fig. 23, a first application screen 932A for setting a transmission condition and a storage time for the signal of each sensor S is displayed on display unit 932. Operation image control unit 973 in Fig. 22 causes a first operation image 947 and a fourth operation image 949 to be displayed on display unit 932 (first application screen 932A).

[0194] First operation image 947 is configured to select sensors S constituting second sensor group Sb from sensors S constituting first sensor group Sa, by an operation of the operator. More specifically, first operation image 947 shows items of sensors S constituting first sensor group Sa as a drop-down list, by being operated by the operator. Each item of sensor S is provided with a check box that allows the operator to select sensor S as sensor S constituting second sensor group Sb.

[0195] Fourth operation image 949 is configured to set the predetermined time for storing the signal of sensor S in storage unit 980. Fourth operation image 949 shows candidates for the predetermined time as a drop-down list, by being operated by the operator. Each candidate for the predetermined time is provided with a check box that allows the operator to select the candidate as the predetermined time. Fourth operation image 949 may be configured such that the operator can directly input the predetermined time.

[0196] As shown in Figs. 24 to 26, a second application screen 932B for monitoring the signals of sensors S is displayed on display unit 932. First image control unit 971 in Fig. 22 causes a first image 941 showing items of sensors S constituting second sensor group Sb, to be displayed on display unit 932 (second application screen 932B).

[0197] The items of sensors S shown in first image 941 is based on selection of sensors S constituting second sensor group Sb in first operation image 947. First image 941 in Fig. 25 shows, as the items of sensors S constituting second sensor group Sb, "Station 1_temperature" (corresponding to temperature sensor 911-1), "Station 2_temperature" (corresponding to temperature sensor 911-2), "Station 3_temperature" (corresponding to temperature sensor 911-3), "Station 4_temperature" (corresponding to temperature sensor 911-4) and "Station 1_proximity" (corresponding to proximity sensor 381-1). As display unit 932 is stroked downward, the items of other sensors S constituting second sensor group Sb are shown.

[0198] As shown in Fig. 25, the operator performs an operation for selecting sensors S constituting a third sensor group Sc from sensors S constituting second sensor group Sb, through display unit 932 constituted by the touch panel display. Sensors S constituting third sensor group Sc are a part of sensors S constituting second sensor group Sb. An upper limit of the number of sensors S constituting third sensor group Sc is predetermined, and is three in the present embodiment.

[0199] As shown in Fig. 24, second image control unit 972 in Fig. 22 causes a second image 942 showing graphs of temporal changes in signals of sensors S constituting third sensor group Sc, to be displayed on display unit 932 (second application screen 932B). Second image control unit 972 generates second image 942 based on the signals of sensors S acquired by signal acquisition unit 961, and causes the generated second image 942 to be displayed on display unit 932. Second image control unit 972 updates display of the graphs in second image 942 every time signal acquisition unit 961 acquires the signals of sensors S.

[0200] In Fig. 24, a temporal change in a signal of "Station 1_temperature" (corresponding to temperature sensor 911-1) (a temperature change) is displayed as a graph in an upper stage 942A of second image 942, a temporal change in a signal of "Station 2_temperature" (corresponding to temperature sensor 911-2) (a temperature change) is displayed as a graph in a middle stage 942B of second image 942, and a temporal change in a signal of "Station 3_temperature" (corresponding to temperature sensor 911-3) (a temperature change) is displayed as a graph in a lower stage 942C of second image 942. In these graphs displayed in second image 942, the axis of ordinate corresponds to "Temperature (K)", and the axis of abscissas corresponds to "Time (s)". "0 (zero)" on the axis of abscissas indicates a current time, and a temperature change for a period that goes back from the current time by a constant time (120 s) is shown.

[0201] Second image control unit 972 in Fig. 22 receives a signal indicating that the value of the signal of specific sensor S exceeds the predetermined threshold value, from signal monitoring unit 966. When second image control unit 972 receives the signal from signal monitoring unit 966, second image control unit 972 changes an appearance of a graph corresponding to specific sensor S in second image 942.

[0202] In second image 942 in Fig. 24, threshold values serving as criteria for determining the presence or absence of an abnormality are indicated by dotted lines. The threshold values are set for each type of sensor by a manufacturer of the machine tool. Control device 950 may be configured to allow the operator to change the threshold values. In upper stage 942A and lower stage 942C of second image 942, the graphs are displayed in blue. In middle stage 942B of second image 942, the graph is displayed in red, because the displayed graph exceeds and falls below the threshold values indicated by the dotted lines. The appearance of the graph to be changed is not limited to a color, and may be a line type, a line thickness, or the like, for example.

[0203] Operation image control unit 973 in Fig. 22 further causes a third operation image 943 that is operated to change a scale of time on the graph in second image 942, to be displayed on display unit 932.

[0204] As shown in Fig. 24, third operation image 943 is formed of a bar in which the axis of abscissas corresponds to "Time (s)". Third operation image 943 includes a point 944. The operator can adjust a range of time on the graphs displayed in second image 942, by pressing point 944 with a finger and sliding point 944 along the axis of abscissas of the bar. For example, the operator can adjust a scale of time (a display width) on the axis of abscissas to 1 / 2, with a scale of temperature on the axis of ordinate being maintained, by moving point 944 from a left end position of the bar indicating "-120 s" to a central position of the bar in a left-right direction indicating "-60 s".

[0205] As shown in Figs. 25 and 26, operation image control unit 973 in Fig. 22 further causes a second operation image 946 (946j, 946k) to be displayed on display unit 932 (second application screen 932B).

[0206] Second operation image 946 is configured to select sensor S constituting third sensor group Sc from sensors S constituting second sensor group Sb, by an operation of the operator. The operator can select sensor S constituting third sensor group Sc using either second operation image 946j or second operation image 946k.

[0207] Second operation image 946j is provided as a check box (displayed as "Display") that is associated with each item of sensor S constituting second sensor group Sb displayed in first image 941, and that allows the operator to select sensor S as sensor S constituting third sensor group Sc. When the operator selects a check box associated with an item of specific sensor S, a graph showing a temporal change in a signal of selected sensor S is displayed in second image 942. A graph showing a temporal change in a signal of firstly selected sensor S is displayed in upper stage 942A of second image 942, a graph showing a temporal change in a signal of subsequently selected sensor S is displayed in middle stage 942B of second image 942, and a graph showing a temporal change in a signal of lastly selected sensor S is displayed in lower stage 942C of second image 942.

[0208] Second operation image 946k is displayed at each position of upper stage 942A, middle stage 942B, and lower stage 942C of second image 942. Second operation image 946k shows the items of sensors S constituting second sensor group Sb as a drop-down list, by being operated by the operator. From the drop-down list, the operator can select sensor S to be displayed in a graph at each position of upper stage 942A, middle stage 942B, and lower stage 942C of second image 942.

[0209] In Fig. 25, second operation image 946k showing the items of sensors S constituting second sensor group Sb, such as "Station 1_temperature" (corresponding to temperature sensor 911-1), "Station 2_temperature" (corresponding to temperature sensor 911-2), and "Station 3_temperature" (corresponding to temperature sensor 911-3), as a drop-down list, is displayed in upper stage 942A of second image 942.

[0210] When the operator selects "Station 1_temperature" (corresponding to temperature sensor 911-1) from the drop-down list in second operation image 946k, as shown in Fig. 26, a temporal change in the signal of "Station 1_temperature" (corresponding to temperature sensor 911-1) (a temperature change) is displayed as a graph in upper stage 942A of second image 942. On this occasion, the item "Station 1_temperature" (corresponding to temperature sensor 911-1) is deleted from first image 941.

[0211] Referring to Figs. 22 and 24, a first region Ra and a second region Rb are defined in display unit 932 (second application screen 932B). Second region Rb is located below first region Ra in display unit 932 (second application screen 932B). Second image control unit 972 displays a plurality of sensing results sensed by sensors S in first region Ra, as second image 942. The graphs showing temporal changes in the signals of sensors S in second image 942 (upper stage 942A, middle stage 942B, lower stage 942C) correspond to the plurality of sensing results sensed by sensors S.

[0212] First image control unit 971 displays the types of sensing sensed by sensors S in second region Rb, as first image 941. The items of sensors S in first image 941 correspond to the types of sensing sensed by sensors S.

[0213] Referring to Fig. 25, second operation image 946k selects, in first region Ra, a sensing result to be displayed in first region Ra. Second operation image (operation unit) 946k has a function of receiving an operation by the operator and selecting a sensing result to be displayed in first region Ra. Second operation image 946k shows the items of sensors S as a drop-down list, and selects a sensing result of sensor S of an item checked in the drop-down list. Second operation image 946k is displayed in first region Ra. Second operation image 946k is displayed at each position of upper stage 942A, middle stage 942B, and lower stage 942C of second image 942 displayed in first region Ra.

[0214] Second operation image 946j selects, in second region Rb, a sensing result to be displayed in first region Ra. Second operation image (operation unit) 946j has a function of receiving an operation by the operator and selecting a sensing result to be displayed in first region Ra. Second operation image 946j shows a check box corresponding to each item of sensor S in first image 941, and selects a sensing result of sensor S of an item checked in the check box. Second operation image 946j is displayed in second region Rb. Second operation image 946j is displayed in association with each item of sensor S in first image 941.

[0215] Referring to Figs. 22, 25, and 26, second operation image 946 (946j, 946k) receives an operation by the operator, and outputs a selection signal for a sensing result to be displayed in first region Ra to control device 950. Operation receiving unit 990 receives the selection signal from second operation image 946. Second image control unit 972 causes the sensing result according to the selection signal from second operation image 946 to be displayed in second image 942.

[0216] It should be noted that, in tool rest 100, a station that holds a tool used for machining is indexed to a predetermined workpiece machining position by swiveling swivel body 21. On the other hand, sensors S such as temperature sensor 911 and acceleration sensor 912 are provided to detect events associated with workpiece machining, such as an increase in temperature and generation of vibration, in the station indexed to the workpiece machining position. In this case, control device 950 may read a NC program to specify sensor S disposed in the station indexed to the workpiece machining position, and automatically select the specified sensor S as sensor S constituting third sensor group Sc.

[0217] Fig. 27 is a flowchart showing a flow of control of display on the display unit by the control device in Fig. 22.

[0218] Referring to Figs. 22, 23, and 27, firstly, control device 950 (display control unit 970) causes first application screen 932A to be displayed on display unit 932 (S101). In this step, operation image control unit 973 causes first operation image 947 to be displayed on first application screen 932A.

[0219] Then, control device 950 (operation receiving unit 990) receives selection of each sensor constituting second sensor group Sb (S102).

[0220] The operator operates first operation image 947 to select sensor S constituting second sensor group Sb from sensors S constituting first sensor group Sa. First operation image 947 receives an operation of the operator, and outputs a selection signal for sensor S constituting second sensor group Sb to control device 950. Operation receiving unit 990 receives the selection signal from first operation image 947, and outputs a signal specifying sensor S constituting second sensor group Sb to transmission command unit 962.

[0221] Then, control device 950 (transmission command unit 962) outputs a transmission command to in-holder substrate 410 (S103).

[0222] Transmission command unit 962 outputs a transmission command to transmit a signal of sensor S constituting second sensor group Sb, to in-holder substrate 410, based on the signal from operation receiving unit 990. In-holder substrate 410 transmits a signal received from sensor S constituting second sensor group Sb, to control device 950.

[0223] Then, control device 950 (signal acquisition unit 961) acquires the signal of sensor S constituting second sensor group Sb (S104). Signal acquisition unit 961 outputs the acquired signal of sensor S constituting second sensor group Sb to display control unit 970.

[0224] Referring to Figs. 22, 25, and 27, next, control device 950 (display control unit 970) causes second application screen 932B (first image 941) to be displayed on display unit 932 (S105). First image control unit 971 causes an item of sensor S constituting second sensor group Sb to be displayed on second application screen 932B, based on the selection signal from first operation image 947 in step S102. Operation image control unit 973 causes second operation image 946 (946j, 946k) to be displayed on second application screen 932B, based on the selection signal from first operation image 947 in step S102.

[0225] Then, control device 950 (operation receiving unit 990) receives selection of each sensor constituting third sensor group Sc (S106).

[0226] The operator operates second operation image 946 (946j, 946k) to select sensor S constituting third sensor group Sc from sensors S constituting second sensor group Sb. Second operation image 946 receives an operation of the operator, and outputs a selection signal for sensor S constituting third sensor group Sc to control device 950. Operation receiving unit 990 receives the selection signal from second operation image 946, and outputs a signal specifying sensor S constituting third sensor group Sc to display control unit 970.

[0227] Referring to Figs. 22, 24, 26, and 27, next, control device 950 (display control unit 970) causes second image 942 to be displayed on display unit 932 (S107). Second image control unit 972 causes a graph showing a temporal change in a signal of sensor S, to be displayed on second application screen 932B, based on the selection signal from second operation image 946.

[0228] Operation panel 930 as an operation device in the present embodiment includes: a first display means (second image control unit 972) that displays, in first region Ra, a plurality of sensing results sensed by sensors S provided to reversal holder 200 as a tool holder that can hold a tool and is mounted on tool rest 100; a second display means (first image control unit 971) that displays, in second region Rb located below first region Ra, the types of sensing sensed by sensors S provided to reversal holder 200 that can hold a tool and is mounted on tool rest 100; a first selection means (second operation image 946k) that selects, in first region Ra, a sensing result to be displayed in first region Ra; and a second selection means (second operation image 946j) that selects, in second region Rb, a sensing result to be displayed in first region Ra.

[0229] With such a configuration, it is possible to select a sensing result to be displayed in first region Ra by second operation image 946k in first region Ra or second operation image 946j in second region Rb, while checking candidates for the sensing results to be displayed in first region Ra based on the types of sensing sensed by sensors S displayed in second region Rb. Thereby, it is possible to improve operability of operation panel 930 in the case of displaying an arbitrary sensing result from a plurality of candidates.

[0230] Operation panel 930 includes: display unit 932 in which first region Ra and second region Rb located below first region Ra are defined; and display control unit 970 that controls image display on display unit 932. Display control unit 970 includes: second image control unit 972 that causes a plurality of sensing results sensed by sensors S provided to reversal holder 200 as a tool holder that can hold a tool and is mounted on tool rest 100, to be displayed in first region Ra; first image control unit 971 that causes the types of sensing sensed by sensors S provided to reversal holder 200 that can hold a tool and is mounted on tool rest 100, to be displayed in second region Rb; an operation image control unit 973k that causes second operation image 946k for selecting a sensing result to be displayed in first region Ra, to be displayed in first region Ra; and an operation image control unit 973j that causes second operation image 946j for selecting a sensing result to be displayed in first region Ra, to be displayed in second region Rb.

[0231] The configuration of machine tool 900 in the third embodiment of the present invention described above will be summarized. Machine tool 900 in the present embodiment includes: display unit 932; reversal holder 200 as at least one tool holder that is mounted on tool rest 100 and can hold a tool; a plurality of sensors S that are provided to the at least one reversal holder 200 and constitute first sensor group Sa; and control device 950. Control device 950 receives selection of each sensor S constituting second sensor group Sb from sensors S constituting first sensor group Sa to acquire a signal of sensor S constituting second sensor group Sb, and causes first image 941 showing items of sensors S constituting second sensor group Sb to be displayed on display unit 932, and receives selection of each sensor S constituting third sensor group Sc from sensors S constituting second sensor group Sb, to cause second image 942 showing graphs of temporal changes in signals of sensors S constituting third sensor group Sc to be displayed on display unit 932.

[0232] With such a configuration, it is possible to check the items of sensors S constituting second sensor group Sb whose signals are to be acquired by control device 950, through first image 941, and to visually check the temporal changes in the signals of sensors S constituting third sensor group Sc, through second image 942. In this case, since sensors S constituting second sensor group Sb whose signals are to be acquired by control device 950 are selected from sensors S constituting first sensor group Sa included in at least one reversal holder 200, and sensors S constituting third sensor group Sc whose graphs are to be displayed in second image 942 are selected from sensors S constituting second sensor group Sb, it is possible to reduce the burden of signal processing in control device 950.

[0233] Further, control device 950 causes first operation image 947 that is operated to select sensors S constituting second sensor group Sb from sensors S constituting first sensor group Sa, to be displayed on display unit 932.

[0234] With such a configuration, the operator can easily select sensors S constituting second sensor group Sb from sensors S constituting first sensor group Sa, by operating first operation image 947.

[0235] Further, control device 950 causes second operation image 946 that is operated to select sensor S constituting third sensor group Sc from sensors S constituting second sensor group Sb, to be displayed on display unit 932.

[0236] With such a configuration, the operator can easily select sensor S constituting third sensor group Sc from sensors S constituting second sensor group Sb, by operating second operation image 946.

[0237] Further, when the value of the signal of specific sensor S exceeds the predetermined threshold value, control device 950 changes an appearance of a graph corresponding to specific sensor S in second image 942.

[0238] With such a configuration, the operator can easily recognize an abnormality in the value of the signal of specific sensor S, through a change in the appearance of the graph in second image 942.

[0239] Further, control device 950 causes third operation image 943 that is operated to change a scale of time on the graph in second image 942, to be displayed on display unit 932.

[0240] With such a configuration, the operator can easily change the scale of time on the graph in second image 942, by operating third operation image 943.

[0241] (Fourth Embodiment) Fig. 28 is a perspective view showing a machine tool. In the present embodiment, a machine tool 50 including tool rest 100 in Fig. 1 will be described.

[0242] Referring to Fig. 28, machine tool 50 has tool rest 100 in Fig. 1, a workpiece spindle (not shown) for rotating a workpiece, a cover body 51, and a door 54.

[0243] Cover body 51 defines a machining area 56, and forms an external appearance of machine tool 50. Machining area 56 is a space in which workpiece machining is performed, and is sealed by cover body 51 and door 54 such that foreign matter such as chips or a coolant resulting from workpiece machining does not leak to the outside of machining area 56.

[0244] Cover body 51 is provided with an opening 53. Opening 53 opens machining area 56 to an external space. Door 54 is provided to opening 53. Door 54 is attached so as to be slidable in a horizontal direction with respect to cover body 51. Opening 53 is opened or closed by sliding door 54.

[0245] Tool rest 100 and the workpiece spindle (not shown) are disposed in machining area 56. Basically, the workpiece is machined by rotating the workpiece by the workpiece spindle and bringing a tool held by tool rest 100 into contact with the rotating workpiece.

[0246] It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the scope of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims.

[0247] This nonprovisional application is based on Japanese Patent Application No. 2024-154102 filed on September 6, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference.

[0248] 12: base; 21: swivel body; 32: flange portion; 32a: first flange surface; 32b: second flange surface; 32p: disc portion; 32q: tapered portion; 34: housing portion; 35, 63: wire hole; 36: cover portion; 41: mounting portion; 42, 320: base portion; 43, 341: block; 44, 44A, 44B, 346, 346A, 346B: terminal hole; 45, 552, 571, 572: seal member; 46: pin; 46a: tip portion; 47, 221: resin portion; 47a, 91a: top surface; 48: pin hole; 49: pin insertion hole; 50, 760, 900: machine tool; 51: cover body; 53: opening; 54: door; 56: machining area; 61: support body; 62: motor housing; 66: built-in motor; 67: intermediate housing; 68: bearing; 71: cylindrical portion; 81: rotary connector; 82: movable portion; 83: fixed portion; 84: drum; 85: conduction band; 86: rotary shaft; 87: housing; 88: brush; 91: lid; 100: tool rest; 110, 150: swivel central axis; 120, 160, 880: rotation central axis; 130J: fixed-side wire; 130K: movable-side wire; 135: wire; 140, 140A, 140B: turret-side terminal; 191: first internal space; 192: second internal space; 200, 200D: reversal holder; 210: tool holder; 210S: first tool holder; 210T: second tool holder; 220, 220A, 220B: holder-side terminal; 222: pin component; 223: contactor; 224, 366: spring member; 225, 326: support portion; 301: shaft portion; 302: blade portion; 310: holder main body; 320c, 525: bottom surface; 321: swivel portion; 322: sleeve; 327: positioning pin; 331: rotation input key; 332: shaft; 336: first bevel gear; 337: second bevel gear; 342, 551, 562: air hole; 361, 361A, 361B: piston cylinder; 371, 371A, 371B: locking piece; 376: claw portion; 381, 381A, 381B, 830: proximity sensor; 410: in-holder substrate; 420: in-turret substrate; 430, 430A, 430B: relay connector; 431: first connector portion; 432: second connector portion; 510: first surface; 520: second surface; 530: recess; 540: block disposition groove; 561: air groove; 570: seal groove; 711, 820: actuator; 721, 841: first electronic circuit; 722, 842: second electronic circuit; 723: third electronic circuit; 724: fourth electronic circuit; 800: jig; 810: arm; 840: substrate; 850A: serial terminal; 850B: power supply terminal; 860: workpiece spindle; 911: temperature sensor; 912: acceleration sensor; 920: control panel; 930: operation panel; 931: operation unit; 932: display unit; 932A: first application screen; 932B: second application screen; 941: first image; 942: second image; 942A: upper stage; 942B: middle stage; 942C: lower stage; 943: third operation image; 944: point; 946, 946j, 946k: second operation image; 947: first operation image; 949: fourth operation image; 950: control device; 960: communication unit; 961: signal acquisition unit; 962: transmission command unit; 966: signal monitoring unit; 970: display control unit; 971: first image control unit; 972: second image control unit; 973: operation image control unit; 980: storage unit; 990: operation receiving unit; Ra: first region; Rb: second region; S: sensor; Sa: first sensor group; Sb: second sensor group; Sc: third sensor group; T: tool; W: workpiece.

Claims

1. A tool rest comprising: a mounting portion which has a first surface and a second surface having a level difference from the first surface, and has a recess which is recessed from the first surface and in which the second surface is disposed at a bottom; a tool holder having a first contact and a second contact which are electrical contacts, and mounted on the mounting portion; a first terminal disposed in the second surface and connected with the first contact of the tool holder; and a second terminal disposed in the second surface and connected with the second contact of the tool holder.

2. A tool rest comprising: a mounting portion which has a first surface and a second surface having a level difference from the first surface, and in which a tool holder can be mounted on the first surface, the mounting portion being provided with a recess which is recessed from the first surface, is opened toward one direction along the second surface, and in which the second surface is disposed at a bottom; and a terminal that is disposed in the second surface and forms an electrical contact with the tool holder.

3. The tool rest according to claim 2, further comprising a swivel body that has a plurality of the mounting portions arranged in a circumferential direction of a predetermined axis, and can swivel about the predetermined axis, wherein the one direction corresponds to an axial direction of the predetermined axis.

4. The tool rest according to claim 2 or 3, further comprising a lid detachably attached to the second surface and disposed in the recess, wherein the lid has a thickness smaller than the level difference formed between the first surface and the second surface.

5. The tool rest according to claim 2 or 3, wherein the mounting portion includes a base portion which has the first surface and on which the tool holder is mounted, and a block which has the second surface and is detachably attached to the base portion, and the terminal is provided to the block.

6. The tool rest according to claim 2 or 3, wherein the terminal includes a resin portion provided with a plurality of pin holes, and a plurality of pins made of metal that are disposed in the plurality of pin holes, respectively, and are integrally held by the resin portion, each of the plurality of pins has a tip portion, the resin portion has a top surface in which the plurality of pin holes are open, and the tip portion is disposed at a position deeper in each of the plurality of pin holes than an opening surface of each of the plurality of pin holes in the top surface.

7. A machine tool comprising the tool rest according to claim 2 or 3.

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