Tool changer and machine tool

Abstract

The present invention provides a tool changer and a machine tool having a plurality of tool magazines that house tools and that can suppress generation of vibration. The tool changer performs a tool change between a first tool magazine and a second tool magazine that house tools, and a center of gravity of the second tool magazine is disposed at a position lower than a tool change position of the first tool magazine and the second tool magazine. Preferably, the second tool magazine is inclined with respect to a horizontal plane.

Description

TECHNICAL FIELD

[0001] The present application relates to a tool changer having a tool magazine and a machine tool. BACKGROUND

[0002] There has been a machine tool having a main tool magazine and a sub tool magazine in which tools are stored. The machine tool performs handover of tools between the main tool magazine and the sub tool magazine (see Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 11-254260 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] Vibration is sometimes generated when tools are handed over between the main tool magazine and the sub tool magazine. The vibration propagates to the spindle of the machine tool and the workpiece holding portion and the like. Since the machine tool vibrates during machining, there is a problem that the machining accuracy of the workpiece decreases.

[0008] An object of the present application is to provide a tool changer having a plurality of tool magazines in which tools are stored, and in which generation of vibration is suppressed.

[0009] SOLUTION TO PROBLEM

[0010] The present application is a tool changer that performs tool changing between a first tool magazine in which tools are stored and a second tool magazine, the center of gravity of the second tool magazine being disposed at a position lower than a tool changing position of the first tool magazine and the second tool magazine.

[0011] The second tool magazine of the tool changer of the present application is stable, and generation of vibration in the second tool magazine can be suppressed.

[0012] The first tool magazine of the present application stores tools mounted to a spindle of a machine tool, and the second tool magazine stores tools stored in the first tool magazine.

[0013] The tool changer of the present application is capable of storing more tools than one tool magazine by providing two tool magazines.

[0014] The second tool magazine of the tool changer of the present application rotates about an axis inclined with respect to the horizontal plane.

[0015] The second tool magazine of the tool changer is inclined with respect to the horizontal plane, whereby the center of gravity of the second tool magazine is lowered.

[0016] The second tool magazine of the tool changer according to the present application includes a support disc, and an arm provided at a peripheral portion of the support disc for holding a tool, one end portion of the arm protruding from the peripheral portion to a radial outer side of the support disc, and the other end portion of the arm being disposed at a position not opposite to the center of the support disc.

[0017] The arm of the tool changer is disposed so as to cross a line extending through the center of the support disc and in the radial direction. Thus, the center of gravity of the second tool magazine of the tool changer is lowered.

[0018] The arm of the tool changer according to the present application includes a support plate fixed to the second tool magazine, and two support rods, the two support rods being rotatable at both sides of the support plate, one support rod having a first portion extending in a direction orthogonal to an axis of the center of rotation of the second tool magazine, a first inclined portion extending from one end portion of the first portion to a direction parallel to the axis of the center of rotation, and a first holding portion provided at the same side as the direction of the other end portion of the first portion for holding a tool, and the other support rod having a second portion extending in a direction orthogonal to the axis of the center of rotation, a second inclined portion extending from one end portion of the second portion to a direction parallel to the axis of the center of rotation, and a second holding portion fixed to the same side as the direction of the other end portion of the second portion for holding a tool, the first holding portion and the second holding portion being located at the same position in the axial direction of the center of rotation.

[0019] In the axial direction of the center of rotation, the directions in which the first inclined portion and the second inclined portion extend are opposite to each other, and the fixed positions of the first holding portion and the second holding portion are opposite to each other, so that the fixed positions of the first holding portion and the second holding portion are the same position. In the tool changer, two identical support rods are prepared and disposed in opposite directions. Thus, the support rods at both sides are identical components, so that management is easy.

[0020] The second tool magazine of the tool changer according to the present application includes a moving mechanism moving in the radial direction, and a tool holder provided to the moving mechanism for holding a tool.

[0021] The tool holder holds a tool, and the moving mechanism conveys the tool held by the tool holder between the first tool magazine and the second tool magazine. Since the tool holder moves in the radial direction, the design of the moving mechanism is easy.

[0022] The moving mechanism of the tool changer according to the present application is located at an upper side of the center of the second tool magazine.

[0023] The moving mechanism performs tool changing at the upper side of the center of the second tool magazine, so that lowering of the position of the second tool magazine is easy.

[0024] The machine tool according to the present application includes the tool changer described above.

[0025] In the machine tool, the center of gravity of the second tool magazine is arranged at a position lower than the tool change positions of the first tool magazine and the second tool magazine. Therefore, for the machine tool, generation of vibration can be suppressed.

[0026] Effects of Invention

[0027] In the tool changer and the machine tool of the present application, the center of gravity of the second tool magazine is arranged at a position lower than the tool change positions of the first tool magazine and the second tool magazine, so the second tool magazine is stabilized and generation of vibration in the second tool magazine can be suppressed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic front view of a machine tool.

[0029] Figure 2 is a schematic structural view of a support disc and an arm of a second tool magazine.

[0030] Figure 3 is a schematic reference front view of a conventional machine tool.

[0031] Figure 4 is a schematic plan view of a first tool magazine, a second tool magazine, and a tool conveying device.

[0032] Figure 5 is a schematic sectional view taken along the line V-V shown in Figure 4

[0033] Figure 6 is a schematic back side perspective view of the vicinity of a second tool magazine.

[0034] Figure 7 is a schematic perspective view of an arm as viewed from the upper left direction.

[0035] Figure 8 is a schematic perspective view of an arm as viewed from the upper right direction.

[0036] Figure 9 is a schematic front view of an arm.

[0037] Figure 10 is a plan view of an arm.

[0038] Figure 11 is a schematic left side view of an arm.

[0039] Figure 12 is a schematic bottom view of an arm.

[0040] Figure 13 is a schematic partially enlarged perspective view of the structure in the vicinity of an arm.

[0041] Figure 14 is a schematic front view of an arm holding a tool.

[0042] Figure 15 ​is a simplified rear view of the arm holding the tool.

[0043] Figure 16 is a right view of the second tool magazine showing the relationship between the distance in the vertical direction between the setting surface of the machine tool and the center of gravity of the second tool magazine and the distance in the vertical direction between the setting surface and the tool change position when the other end portion of the arm is not opposite the center.

[0044] Figure 17 is a reference right view of the second tool magazine showing the relationship between the distance between the setting surface of the machine tool and the center of gravity of the second tool magazine and the distance between the setting surface and the tool change position when the other end portion of the arm is opposite the center axis. DETAILED DESCRIPTION

[0045] The machine tool of the present application will be described below with reference to the drawings. In the following description, the illustrated up-down, front-rear, left-right directions are used. In the drawings, Figure 1 In the drawing, L indicates a horizontal plane, and L1 indicates a center axis of the second tool magazine 8.

[0046] The machine tool is provided with a base 1, a workpiece holding portion 2, an XY moving mechanism 3, a column 4, a Z moving mechanism 5, a first tool magazine 6, a support portion 7, a second tool magazine 8, a tool conveying device (omitted from the drawing), a spindle head 10, and the like.

[0047] The first tool magazine 6, the support portion 7, the second tool magazine 8, and the tool conveying device constitute a tool changing device.

[0048] The base 1 is rectangular in plan view and extends in the front-rear direction. The workpiece holding portion 2 is provided on the upper front side of the base 1. On the upper portion of the base 1, on the rear side of the workpiece holding portion 2, the XY moving mechanism 3 is provided which is movable in the left-right direction (X direction) and the front-rear direction (Y direction).

[0049] The column 4 is provided on the upper side of the XY moving mechanism 3. The Z moving mechanism 5 is provided on the front surface of the column 4 which is movable in the up-down direction (Z direction). The spindle head 10 is provided on the Z moving mechanism 5. The spindle head 10 has a spindle which extends in the up-down direction. A tool is attached to the lower end portion of the spindle.

[0050] The first tool magazine 6 is provided on the front side of the spindle head 10. The first tool magazine 6 is connected to the column 4 via a connecting member. The first tool magazine 6 has a disc 6a and an arm 6b. A motor (omitted from the drawing) is connected to the disc 6a, and the disc 6a is rotated about the center axis thereof by the driving of the motor. A plurality of arms 6b are provided in a radial manner on the peripheral portion of the disc 6a. The arms 6b hold tools.

[0051] The first tool magazine 6 is arranged so that the center axis of the disc 6a extends in the front-rear direction and the disc 6a is in a forward inclined posture. The lower end position of the first tool magazine 6 is a tool change position. In a case where a tool is to be attached to the spindle, the arm 6b holding the tool is arranged at the tool change position, and the Z moving mechanism 5 is moved downward. Based on the downward movement of the Z moving mechanism 5, the tool held by the arm 6b is attached to the spindle. In a case where the tool is to be detached from the spindle, the empty arm 6b is arranged at the tool change position, and the Z moving mechanism 5 is moved upward. Based on the upward movement of the Z moving mechanism 5, the arm 6b holds the tool of the spindle, and the tool is detached from the spindle.

[0052] The tool attached to the spindle processes the workpiece held by the workpiece holding portion 2. The XY moving mechanism 3 adjusts the front-rear and left-right positions of the tool (spindle) with respect to the workpiece, and the Z moving mechanism 5 adjusts the up-down position of the tool.

[0053] The support portion 7 is provided at the left rear side of the base 1. The support portion 7 extends upward, and the second tool magazine 8 is provided at the top end portion thereof. The second tool magazine 8 is arranged at the left rear side of the first tool magazine 6. The second tool magazine 8 is provided with a tool transfer device. The tool transfer device performs the handover of the tool between the arm 6b of the first tool magazine 6 and the arm 8b of the second tool magazine 8.

[0054] Figure 2 is a view as seen from the axis direction of the support disc 8a. The second tool magazine 8 has the support disc 8a and the arm 8b. The support disc 8a is coupled to a motor (not shown), and is rotated about the center axis LI (refer to Figure 1 ) by the driving of the motor. The center axis LI of the support disc 8a is the axis of the center of rotation, and is an imaginary axis.

[0055] As shown in Figure 1 , one surface of the support disc 8a (refer to Figure 2 ) faces the right oblique rear side, and the other surface faces the left oblique front side, and the center axis LI intersects with the horizontal plane L. When viewed from above, the center axis LI extends toward the left oblique front side and the right oblique rear side. The front side of the center axis LI is located at a position lower than the horizontal plane L, and the rear side of the center axis LI is located at a position higher than the horizontal plane L. The center axis LI and the horizontal plane L form a predetermined angle Θ.

[0056] In a case where the horizontal plane L passing through the center axis of the first tool magazine 6 is set, the arm 6b of the first tool magazine 6 and the arm 8b of the second tool magazine 8 are closest at a position lower than the horizontal plane L. This closest position is a tool magazine tool change position P at which the tool of the first tool magazine 6 and the tool of the second tool magazine 8 are exchanged. Hereinafter, the arm 6b of the first tool magazine 6 arranged at the tool magazine tool change position P will be referred to as an exchange position arm 6c, and the arm 8b of the second tool magazine 8 arranged at the tool magazine tool change position P will be referred to as an exchange position arm 8c. The machine tool performs tool exchange between the exchange position arm 6c and the exchange position arm 8c.

[0057] The center of gravity 8g of the second tool magazine 8 is disposed at a position lower than the horizontal plane L, i.e., at a position lower than the tool changing position P of the tool magazine.

[0058] Since the center of gravity 8g of the second tool magazine 8 is disposed at a position lower than the tool changing position P of the first tool magazine 6 and the second tool magazine 8, the second tool magazine 8 is stable, and vibration of the second tool magazine 8 can be suppressed.

[0059] Figure 3 is a front view of a conventional machine tool. Figure 3 La indicates the vertical position of the tool changing position Pa. The central axis L4 of the second tool magazine 8A is parallel to the horizontal plane L. In the case where the central axis L4 and the horizontal plane L are parallel, the center of gravity 8G of the second tool magazine 8A is located at a position higher than the tool changing position Pa. In Figure 3 In the machine tool of Figure 1 In the machine tool of

[0060] Figure 1 The center of gravity 8g of the second tool magazine 8 is disposed at a position lower than the tool changing position P, and thus the second tool magazine 8 is stable, and vibration of the second tool magazine 8 can be suppressed for the machine tool. The second tool magazine 8 can also be disposed at the right side of the first tool magazine 6.

[0061] Another example of the present application will be described below with reference to the drawings. The same reference numerals are assigned to the same structures as those of the foregoing example, and detailed description thereof will be omitted.

[0062] Figure 5 The cutting line of the second tool magazine 8 is orthogonal to the central axis of the support disc 81. The first tool magazine 6 is provided with a cover 6d. The cover 6d covers the outer side of each arm 6b. The cover 6d is rotatable, and rotates together with the arm 6b when changing tools between the spindle, and does not interfere with the tool changing.

[0063] As shown in Figure 6 A mounting member 70 is fixedly installed at the upper end portion of the support portion 7. The mounting member 70 is provided with a front plate portion 70a, a rear plate portion 70b, and a support cylinder 70c. The front plate portion 70a and the rear plate portion 70b extend upward to the right from the upper end portion of the support portion 7, and are arranged in front and back. The support cylinder 70c is connected to the upper end portion of the front plate portion 70a and the upper end portion of the rear plate portion 70b with the left-right direction as the axis direction.

[0064] A reduction gear device 71 is connected to the right side of the support cylinder 70c. The reduction gear device 71 has an annular inner peripheral portion 72 and an annular outer peripheral portion 73. The inner peripheral portion 72 is fixed to the periphery of the support cylinder 70c. The outer peripheral portion 73 is mounted around the inner peripheral portion 72 in a manner that allows it to rotate about an axis. That is, the inner peripheral portion 72 supports the outer peripheral portion 73 so that it can rotate.

[0065] The second tool magazine 80 includes a support disc 81, a motor 82, and an arm 83. The motor 82 is connected to the left side of the support cylinder 70c. The support disc 81 is positioned on the right side of the reduction gear device 71 with both surfaces facing left and right. The right surface of the support disc 81 faces slightly rearward, and the left surface faces slightly forward. A through hole 81b is provided in the center of the support disc 81, extending through the support disc 81 from left to right (see reference). Figure 5 The support cylinder 70c and the inner peripheral portion 72 extend axially and are inserted into the through hole 81b. The outer peripheral portion 73 is connected to the inner peripheral portion of the through hole 81b. Driven by the motor 82, the outer peripheral portion 73 rotates, thereby causing the support disk 81 to rotate about its central axis. A plurality of arms 83 are radially arranged on the periphery of the support disk 81. The arms 83 hold the cutting tool.

[0066] The holding arm 6b of the first tool magazine 6 and the holding arm 83 of the second tool magazine 80 are closest to each other at a position lower than the center 81a. This closest position is the tool change position P for exchanging tools between the first tool magazine 6 and the second tool magazine 80. Hereinafter, the arm 6b of the first tool magazine 6 positioned at the tool change position P will be referred to as the exchange position arm 6c, and the holding arm 83 of the second tool magazine 80 positioned at the tool change position P will be referred to as the exchange position arm 84. Tool changing is performed between the exchange position arm 6c and the exchange position arm 84. One end 83f of the holding arm 83 protrudes radially outward from the periphery of the support disk 81.

[0067] exist Figure 5 In the diagram, L2 represents the line passing through the central axis 81a of the support disk 81 and the center of the tool 50 held by the exchange position arm 84, and L3 represents the line along the length of the exchange position arm 84. Line L3 passes through the center of the exchange position arm 84. Lines L2 and L3 intersect to form a predetermined angle θ1 (>0). Each arm 83 located at the tool change position P of the tool magazine is configured to form the predetermined angle θ1, therefore, the other end 83g of the arm 83 is not opposite to the central axis 81a of the support disk 81.

[0068] A tool feeder 9 is provided on the right side of the support disk 81. The tool feeder 9 includes a motor 9a, a ball screw 9b, a nut 9c, a track 9d, a sliding part 9e, a tool holder 9f, and a connecting part 9g. The motor 9a, ball screw 9b, nut 9c, track 9d, sliding part 9e, and connecting part 9g constitute a moving mechanism. The moving mechanism is located above the central axis 81a of the support disk 81. The support cylinder 70c inserted into the through hole 81b and the inner circumference 72 support the ball screw 9b and the track 9d. The ball screw 9b is connected to the rotating shaft of the motor 9a. The nut 9c is connected to the ball screw 9b.

[0069] like Figure 5 As shown, the track 9d is positioned next to the ball screw 9b. The track 9d is fixed at a position offset from the central axis 81a of the support disk 81. The track 9d extends along the length of the exchange position arm 84. One end of the track 9d faces the exchange position arm 84. A sliding part 9e is slidably mounted on the track 9d. A tool holder 9f is mounted on the sliding part 9e. A connecting part 9g connects the sliding part 9e and the nut 9c. Driven by the motor 9a, the ball screw 9b rotates, thereby moving the nut 9c along the ball screw 9b, and causing the sliding part 9e, the connecting part 9g, and the tool holder 9f to move along the track 9d. The tool holder 9f clamps the tool 50 held by the exchange position arm 84 and transfers it to the empty exchange position arm 6c, or clamps the tool 50 held by the exchange position arm 6c and transfers it to the empty exchange position arm 84. Figure 5 As shown, the center of gravity 8g of the second tool magazine 80 is located near the central axis 81a and is located lower than the center of the first tool magazine 6.

[0070] like Figure 5 and Figure 6 As shown, multiple arms 83 are arranged along the periphery of the support disk 81. The arms 83 extend radially along the support disk 81. The structure of the arms 83 will be described below.

[0071] like Figure 7 and Figure 8 As shown, arm 83 includes a first support rod 831 and a second support rod 832. Support plate 83a, first support rod 831, and second support rod 832 extend in the front-rear direction. The front end of support plate 83a, viewed from above, has a rearward-protruding arc shape. The first support rod 831 and second support rod 832 are separated in the left-right direction and are respectively positioned on the left and right sides of support plate 83a.

[0072] The midpoint of the first support rod 831 in the front-rear direction is connected to the midpoint of the support plate 83a in the front-rear direction via a pivot 83d with the vertical direction as the axial direction. The midpoint of the second support rod 832 in the front-rear direction is connected to the midpoint of the support plate 83a in the front-rear direction via a pivot 83e with the vertical direction as the axial direction.

[0073] The portion of the first support lever 831 on the front side of the pivot 83d is referred to as a front portion 831d, and the portion of the first support lever 831 on the rear side of the pivot 83d is referred to as a rear portion 831e. The portion of the second support lever 832 on the front side of the pivot 83e is referred to as a front portion 832d, and the portion of the second support lever 832 on the rear side of the pivot 83e is referred to as a rear portion 832e. The front portion 831d of the first support lever 831 is bent in a manner that protrudes to the left side. The front portion 832d of the second support lever 832 is bent in a manner that protrudes to the right side. The circular-arc-shaped front end portion of the support plate 83a is disposed between the front portion 831d of the first support lever 831 and the front portion 832d of the second support lever 832.

[0074] A spring seat 831c is provided at the rear end portion of the first support lever 831. A spring seat 832c is provided at the rear end portion of the second support lever 832. The two spring seats 831c, 832c are circular-plate-shaped and oppose each other in the left-right direction. A compression spring 83c is disposed between the two spring seats 831c, 832c. The compression spring 83c exerts a force on the two spring seats 831c, 832c in a manner that causes the two spring seats 831c, 832c to move away from each other in the left-right direction.

[0075] The front portion 831d of the first support lever 831 is positioned on the left side of the rear portion 831e. An inclined portion 831a links the front portion 831d and the rear portion 831e. The inclined portion 831a is inclined in a manner that extends toward the lower side as it goes from the rear end portion of the front portion 831d toward the rear side. A roller 831b is provided at the front end portion lower surface of the front portion 831d. The front portion 831d constitutes a first portion, and the inclined portion 831a constitutes a first inclined portion. The roller 831b constitutes a first gripping portion. The up-down direction is a direction parallel to the axial direction of the rotation center of the second tool magazine 80.

[0076] The front portion 832d of the second support lever 832 is positioned on the right side of the rear portion 832e. An inclined portion 832a links the front portion 832d and the rear portion 832e. The inclined portion 832a is inclined in a manner that extends toward the upper side as it goes from the rear end portion of the front portion 832d toward the rear side. A roller 832b is provided at the front end portion upper surface of the front portion 832d. The front portion 832d constitutes a second portion, the inclined portion 832a constitutes a second inclined portion, and the roller 832b constitutes a second gripping portion.

[0077] The first support rod 831 and the second support rod 832 are identical components, only reversed vertically. In a direction parallel to the axis of rotation of the tool magazine 80, the positions of the pivot 83d and pivot 83e are the same. The tilting directions of the inclined portion 831a and inclined portion 832a are opposite, but the tilt angles are the same. The lengths of the inclined portion 831a and inclined portion 832a are the same. Therefore, in a direction parallel to the axis of rotation of the tool magazine, the positions of the roller 831b and roller 832b are the same.

[0078] like Figure 13 As shown, multiple arms 83 are arranged along the periphery of the support disk 81. The multiple arms 83 include a first arm 83A and a second arm 83B located next to the first arm 83A. The front portion 831d of the first arm 83A is located above the front portion 832d of the second arm 83B. That is, in adjacent first arms 83A and second arms 83B, the positions of the front portions 831d of the first arm 83A and 832d of the second arm 83B are offset in the vertical direction, i.e., along the axial direction of the support disk 81.

[0079] As mentioned above, lines L2 and L3 intersect to form a predetermined angle θ1. Therefore, the first arm 83A and the second arm 83B, i.e., the two adjacent arms 83, are at least partially in the same position in the circumferential direction of the support disk 81. However, the front portions 831d and 832d overlap in a direction parallel to the central axis 81a. In other words, the positions of the front portions 831d and 832d are offset in the axial direction of the support disk 81. Therefore, the two adjacent arms 83 in the circumferential direction will not interfere with each other.

[0080] like Figure 14 , Figure 15 As shown, the cutter 50 is mounted between the front portion 831d of the first support rod 831 and the front portion 832d of the second support rod 832. The rollers 831b and 832b hold the cutter 50 by the force of the compression spring 83c.

[0081] The following is for reference Figure 16 and Figure 17 The machine tool is described below. D represents the vertical distance between the machine tool's setting surface 100 and the center of gravity 8g of the second tool magazine 80. S represents the vertical distance between the setting surface 100 and the tool change position P. Line Lb represents the vertical position of the tool change position P. The center of gravity 8g of the second tool magazine 80 is located near its central axis 81a and is positioned lower than the tool change position P. That is, the exchange position arms 6c and 84 are positioned higher than the center of gravity 8g, with a distance D shorter than distance S. Line L3 passing through the center of the exchange position arm 84 is horizontal, and the exchange position arm 84 is directly opposite the exchange position arm 6c.

[0082] Figure 17 is the case where the other end of the arm 8b is opposite the center axis Ll, and corresponds to Figure 16 Figure 1 Figure 2 The structure of the second tool magazine 8 is the same as that of the second tool magazine 8 of Figure 16 Figure 17 In the second tool magazine 8, the position of the exchange position arm 6c and the tool magazine tool exchange position P are the same, and thus the distance S is also the same.

[0083] The center of gravity 8g of the second tool magazine 8 is located near the center axis Ll of the second tool magazine 8, and is located on the lower side than the tool magazine tool exchange position P. In this case, the line L3 passing through the center of the exchange position arm 8c is inclined, and the exchange position arm 8c is not directly opposite the exchange position arm 6c. Thus, in the case of exchanging tools between the exchange position arms 8c, 6c, an adverse situation such as incomplete gripping of the tool or dropping of the tool can occur. In order to make the exchange position arm 8c directly opposite the exchange position arm 6c, it is necessary to move the second tool magazine 8 upward to make the arm adjacent to the exchange position arm 8c on the lower side of the exchange position arm 8c become the exchange position arm. Figure 17

[0084] By setting the orientation of the arm 83 in such a manner that the other end 83g is not opposite the center axis 81a (Fig. 8), the exchange position arm 84 is directly opposite the exchange position arm 6c, and the distance between the setting surface 100 and the center of gravity 8g can be shortened, as compared with the case where the other end 8bb is opposite the center axis Ll. That is, it is possible to smoothly perform tool exchange, and the center of gravity 8g of the second tool magazine 80 can be lowered. Figure 16

[0085] In the other tool exchange device and machine tool, the arm 83 is arranged in such a manner that the line L2 passing through the center of the support disc 81 and extending in the radial direction and the line L3 extending in the length direction of the arm 83 intersect. By adopting this arrangement, it is possible to smoothly perform tool exchange, and the center of gravity of the second tool magazine 80 is lowered.

[0086] The tool pocket 9f grips the tool 50, and the moving mechanism transports the tool 50 gripped by the tool pocket 9f between the first tool magazine 6 and the second tool magazine 80. The moving mechanism performs tool exchange on the upper side of the center of the second tool magazine 80, and thus it is easy to lower the position of the second tool magazine 80.

[0087] It is possible to incline the center axis (axis of the center of rotation) Ll of the first tool magazine 6 with respect to the horizontal plane, or to make it parallel to the horizontal plane. The illustration of the tool transport device is omitted in Embodiment 1, but the tool transport device of Embodiment 1 has the same structure as the tool transport device 9 of Embodiment 2. ​​​​​

[0088] The embodiments disclosed in the present application are exemplary in all aspects and are not limiting. The technical features described in the respective embodiments can be combined with each other, and the technical scope of the present application includes all modifications in the claims and the scope equivalent thereto.

[0089] Explanation of Reference Signs

[0090] 50, tool; 6, first tool magazine; 8, 80, second tool magazine; 8a, 81, support disc; 8b, 83, arm; L1, center axis (axis of center of rotation); 9, tool conveying device; 9a, motor (moving mechanism); 9b, ball screw (moving mechanism); 9c, nut (moving mechanism); 9d, rail (moving mechanism); 9e, slide (moving mechanism); 9f, tool pocket; 9g, link portion (moving mechanism); P, Pa, tool magazine tool change position.

Claims

1. A tool changer that changes a tool between a first tool magazine that stores a tool and a second tool magazine that stores a tool, characterized in that, a center of gravity of the second tool magazine is disposed at a lower side than a tool changing position of the first tool magazine and the second tool magazine, the second tool magazine includes: a support disc; and an arm that is provided at a peripheral portion of the support disc and that holds a tool, one end portion of the arm protrudes from the peripheral portion to a radial outer side of the support disc, the other end portion of the arm is disposed at a position that is not opposite a center of the support disc.

2. A tool changer that changes a tool between a first tool magazine that stores a tool and a second tool magazine that stores a tool, characterized in that, a center of gravity of the second tool magazine is disposed at a lower side than a tool changing position of the first tool magazine and the second tool magazine, the second tool magazine includes: a moving mechanism that moves in a radial direction; and a tool holder that is provided at the moving mechanism and that holds a tool.

3. A tool changer that changes a tool between a first tool magazine that stores a tool and a second tool magazine that stores a tool, characterized in that, a center of gravity of the second tool magazine is disposed at a lower side than a tool changing position of the first tool magazine and the second tool magazine, the first tool magazine stores a tool that is mounted to a spindle of a machine tool, the second tool magazine stores the tool that is stored at the first tool magazine, the second tool magazine rotates around an axis that is inclined with respect to a horizontal plane.

4. The tool changer according to claim 2 or 3, characterized in that, the second tool magazine includes: a support disc; and an arm that is provided at a peripheral portion of the support disc and that holds a tool, one end portion of the arm protrudes from the peripheral portion to a radial outer side of the support disc, the other end portion of the arm is disposed at a position that is not opposite a center of the support disc.

5. The tool changer according to claim 4, characterized in that, the arm includes: a support plate that is fixed to the second tool magazine; and two support rods that rotate at both sides of the support plate, one of the support rods has: a first portion that extends in a direction that is orthogonal to an axis of a center of rotation of the second tool magazine; a first inclined portion that extends from one end portion of the first portion to a direction that is parallel to the axis of the center of rotation; and a first holding portion that is provided at a same side of the other end portion of the first portion as the direction, and that holds a tool, the other of the support rods has: a second portion that extends in a direction that is orthogonal to the axis of the center of rotation; a second inclined portion that extends from one end portion of the second portion to another direction that is parallel to the axis of the center of rotation; and a second holding portion that is fixed to a same side of the other end portion of the second portion as the other direction, and that holds a tool, the first holding portion and the second holding portion are located at the same position in an axial direction of the center of rotation.

6. The tool changer according to claim 1 or 3, characterized in that, the second tool magazine includes: a moving mechanism that moves in a radial direction; and a tool holder that is provided at the moving mechanism and that holds a tool. ​ ​ 7. The tool changer according to claim 6, characterized in that the moving mechanism is located on the upper side of the center of the second tool magazine.

8. A machine tool, characterized in that the machine tool is provided with the tool changer according to any one of claims 1 to 7.

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