Machine tool

Abstract

A machine tool 1 comprises conveyance devices (a first conveyance device 100 and a second conveyance device 200) that convey objects to be conveyed. The objects to be conveyed include a first object to be conveyed (a final workpiece 54) and a second object to be conveyed (remaining material 55) that differs from the first object to be conveyed. The conveyance devices are provided with: a conveyance unit (a first conveyance unit 110 and a second conveyance unit 210) that integrally comprises a holding part which holds the first object to be conveyed and a placement part on which the second object to be conveyed is placed; and a movement mechanism (a first movement mechanism 120 and a second movement mechanism 220) that moves the conveyance unit in a state in which the first object to be conveyed is held, a state in which the second object to be conveyed has been placed, or a state in which the first object to be conveyed is held and the second object to be conveyed has been placed.

Description

Machine tool

[0001] The present invention relates to a machine tool including a conveying device for conveying an object to be conveyed.

[0002] In a machine tool, a conveying device for conveying a workpiece or the like is provided. However, in the conveying device according to the conventional example, it is necessary to replace or remove a member for holding the workpiece according to the dimensions of the workpiece or the like to be conveyed (see Patent Document 1). Therefore, there is still room for improvement.

[0003] Japanese Patent No. 3892267

[0004] An object of the present invention is to provide a machine tool capable of improving productivity.

[0005] The present invention is a machine tool including a conveying device for conveying an object to be conveyed, wherein the object to be conveyed includes a first object to be conveyed and a second object to be conveyed different from the first object to be conveyed, and the conveying device includes a conveying unit integrally including a clamping portion for clamping the first object to be conveyed and a placing portion for placing the second object to be conveyed, and a moving mechanism for moving the conveying unit in a state where the first object to be conveyed is clamped, or the second object to be conveyed is placed, or the first object to be conveyed is clamped and the second object to be conveyed is placed.

[0006] The machine tool includes a main shaft and a tool for machining a machining object attached to the main shaft, and a first conveying device is provided as the conveying device. The first conveying device may be configured such that the conveying unit is movable between a receiving position for receiving the object to be conveyed after being machined by the tool from the main shaft and a carry-out start position for carrying out the object to be conveyed outside the machine by the moving mechanism.

[0007] In the first conveying device, the clamping portion may have a hand configured to be openable and closable, and the placing portion may include an openable and closable bucket having a bucket constituent member connected to the hand and interlocking integrally with the hand. [[ID=二十二]]

[0008] The hand may be provided with a pair of hand claws formed according to the outer shape of the first object to be conveyed.

[0009] The aforementioned hand may be a parallel hand that moves in translation.

[0010] The main spindle includes a first spindle to which the workpiece is attached, and a second spindle provided coaxially with the first spindle, which grips the other end of the workpiece after a portion of the workpiece gripped by the first spindle has been processed. The first workpiece is the final workpiece obtained by further processing the workpiece after the workpiece has been cut from the unprocessed portion of the workpiece, with the other end of the workpiece gripped by the second spindle, and the second workpiece is the remaining material after the portion that will become the final workpiece has been cut from the workpiece gripped by the first spindle.

[0011] The opening and closing bucket is preferably positioned on the main shaft side relative to the hand.

[0012] The hand grips and transports the first object to be transported, and the opening / closing bucket places and transports the second object to be transported.

[0013] When the hand is closed and the open / close type bucket is viewed in a direction parallel to the axis of the main shaft, it is preferable that the opening range of the hand is included within the opening range of the open / close type bucket.

[0014] The machine tool comprises a spindle and a tool for machining a workpiece attached to the spindle, and a second conveying device is provided as the conveying device, and the second conveying device is preferably configured such that the conveying unit is movable between a discharge start position for discharging the workpiece after it has been machined by the tool and a discharge position outside the machine by the moving mechanism.

[0015] In the second conveying device, the conveying unit may include a support member that supports the clamping portion and the placement portion, the clamping portion may have a hand configured to open and close, and the placement portion may include a bucket fixed to the support member.

[0016] The hand may be provided with a pair of hand claws formed according to the outer shape of the first object to be conveyed.

[0017] The aforementioned hand may be a parallel hand that moves in translation.

[0018] Furthermore, the above configurations can be combined and adopted as much as possible.

[0019] As explained above, the present invention makes it possible to improve productivity.

[0020] Figure 1 is a schematic diagram of a machine tool according to an embodiment of the present invention. Figure 2 is a schematic diagram of a first conveying device according to an embodiment of the present invention. Figure 3 is a schematic diagram of a conveying unit in the first conveying device according to an embodiment of the present invention. Figure 4 is a schematic diagram of a second conveying device according to an embodiment of the present invention. Figure 5 is an explanatory diagram of the working operation of a machine tool according to an embodiment of the present invention. Figure 6 is an explanatory diagram of the working operation of a machine tool according to an embodiment of the present invention. Figure 7 is an explanatory diagram of the conveying operation of a first conveyed object by the first conveying device according to an embodiment of the present invention. Figure 8 is an explanatory diagram of the conveying operation of a first conveyed object by the first conveying device according to an embodiment of the present invention. Figure 9 is an explanatory diagram of the conveying operation of a first conveyed object by the first conveying device according to an embodiment of the present invention. Figure 10 is an explanatory diagram of the conveying operation of a first conveyed object by the second conveying device according to an embodiment of the present invention. Figure 11 is an explanatory diagram of the conveying operation of a second conveyed object by the first conveying device according to an embodiment of the present invention. Figure 12 is an explanatory diagram of the conveying operation of a second conveyed object by the first conveying device according to an embodiment of the present invention. Figure 13 is an explanatory diagram of the conveying operation of a second conveyed object by the first conveying device according to an embodiment of the present invention. Figure 14 is an explanatory diagram of the transport operation of a second object to be transported by a second transport device according to an embodiment of the present invention.

[0021] The embodiments for carrying out this invention will be described in detail below with reference to the drawings, based on examples. However, unless otherwise specifically stated, the dimensions, materials, shapes, and relative arrangements of the components described in these embodiments are not intended to limit the scope of this invention to those components alone.

[0022] (Example) A machine tool 1 according to an embodiment of the present invention will be described with reference to Figures 1 to 14. In each figure, the components constituting the machine tool 1 are shown in a simplified manner. In the machine tool 1, the side from which the working process in the work area can be observed is considered the front, and the opposite side is considered the back. In the XYZ axes shown in each figure, with the machine tool 1 installed on a horizontal plane, the X axis and Z axis are parallel to the horizontal plane, and the Y axis is parallel to the vertical direction. The Z axis is parallel to the spindle of the machine tool, and when an observer observes the work area, the right side is the +Z axis side, and the left side is the -Z axis side. The X axis is perpendicular to the Z axis, and the front side is the +X axis side, and the back side is the -X axis side. Furthermore, the upper side in the vertical direction is the +Y axis side, and the lower side in the vertical direction is the -Y axis side.

[0023] <Overall Configuration of Machine Tool (NC Machine Tool)> The overall configuration of machine tool 1 will be explained with reference to Figure 1. Machine tool 1 comprises a housing 10 having a space 11 which is the work area shown by the dotted line in the figure, a pair of tool posts (hereinafter referred to as the first tool post 20A and the second tool post 20B), and a pair of spindle mechanisms (hereinafter referred to as the first spindle mechanism 30 and the second spindle mechanism 40).

[0024] The configuration of the tool post itself in the machine tool 1 is known technology, so it will be briefly explained here. In this embodiment, a first tool post 20A is provided on the left side of the space 11, and a second tool post 20B is provided on the right side. However, it is also possible to adopt a configuration in which the tool post is provided in only one of the two locations. The configurations of the first tool post 20A and the second tool post 20B are the same, and each includes a tool 21, a holding member 22 for holding the tool 21, and a tool post body 23 for operating the tool 21 together with the holding member 22. The tool post body 23 is configured to be movable in any of the X-axis, Y-axis, or Z-axis directions. In this embodiment, the holding member 22 is configured to be rotatable about a central axis parallel to the Z-axis, and is configured to be able to hold multiple types of tools 21. The explanation of this configuration is known technology, so it will be omitted. In this embodiment, multiple types of tools 21 can be held by the holding member 22, and the tool 21 used for machining can be changed by rotating the holding member 22. In this embodiment, the first tool post 20A is equipped with tools 21A and 21C as tools 21, and the second tool post 20B is equipped with tool 21B as a tool 21. Hereafter, when the tools are described separately, they will be referred to as tool 21A, tool 21B, and tool 21C, and when there is no need to distinguish them, they will be referred to as tool 21.

[0025] The configuration of the spindle mechanism in machine tool 1 is known technology, so it will be briefly explained here. In this embodiment, a first spindle mechanism 30 is provided on the left side of the space 11, and a second spindle mechanism 40 is provided on the right side. The first spindle mechanism 30 includes a first spindle 31, a first rotation mechanism 32 for rotating the first spindle 31, and a first chuck 33 for holding the workpiece. The first rotation mechanism 32 can be configured by, for example, a motor. In addition, although not specifically shown, the first spindle 31 is provided with a through hole that penetrates in the Z-axis direction, and the material is supplied through the through hole from the -Z-axis direction to the +Z-axis direction by a material supply device and held by the first chuck 33.

[0026] The second spindle mechanism 40 includes a second spindle 41 provided coaxially with the first spindle, a second rotation mechanism 42 for rotating the second spindle 41, a support member 42a for supporting the second rotation mechanism 42, and a second chuck 43 for holding a workpiece. The second spindle mechanism 40 also includes a reciprocating member 44 for reciprocating the support member 42a and a power source 45 for the reciprocating member 44, in order to enable the second spindle 41 to reciprocate in the Z-axis direction. The second rotation mechanism 42 can be configured by, for example, a motor. Various known technologies, such as a ball screw mechanism or a rack and pinion mechanism, can be used as the mechanism for reciprocating the second spindle 41 in the Z-axis direction. When a ball screw mechanism is used, the reciprocating member 44 is configured by a ball screw shaft, and the power source 45 is configured by a motor.

[0027] In the machine tool 1 according to this embodiment, two conveying devices (hereinafter referred to as the first conveying device 100 and the second conveying device 200) are provided. The first conveying device 100 is responsible for receiving the workpiece after it has been processed by the tool 21 from the spindle and transporting it to the discharge start position for transporting it out of the machine. The second conveying device 200 is responsible for transporting the workpiece that has been transported to the discharge start position to the discharge position outside the machine. These conveying devices will be described in detail below.

[0028] <First Conveying Device> The first conveying device 100 will be described with reference to Figures 1 to 3. The first conveying device 100 includes a first conveying unit 110 which integrally includes a gripping section for gripping a first object to be conveyed and a placement section for placing a second object to be conveyed, and a first moving mechanism 120 for moving the first conveying unit 110. The first moving mechanism 120 can move the first conveying unit 110 while gripping the first object to be conveyed, or with the second object to be conveyed placed on it, or while gripping the first object to be conveyed and placing the second object to be conveyed on it. However, depending on the dimensions of the first and second objects to be conveyed, it may be possible to convey only one of them at a time.

[0029] Figure 3 is an external view of the first transport unit 110, where (a) is a view of the first transport unit 110 from the clamping section side, with the rear mounting section indicated by a dotted line, (b) is a view of the first transport unit 110 from the drive section side toward the clamping section and mounting section, and (c) is a view of the first transport unit 110 from the mounting section side, with the rear clamping section indicated by a dotted line.

[0030] The gripping section has a hand 111 composed of a pair of openable and closable hand claws 111a and 111b. The inner shape of the hand claws 111a and 111b is formed according to the outer shape of the first object to be conveyed in order to grip the first object to be conveyed. The mounting section has an openable and closable bucket 112 which is connected to the hand 111 (to the hand claws 111a and 111b, respectively) and has bucket components 112a and 112b which interlock integrally with the hand 111. The first conveying unit 110 is equipped with an open / close mechanism 113 for opening and closing the hand 111. In each figure of Figure 3, the left side shows the hand 111 in the open state, and the right side shows the hand 111 in the closed state. Note that the hand 111, which constitutes the gripping section, is positioned on the +Z axis side relative to the openable and closable bucket 112, which constitutes the mounting section.

[0031] The opening / closing mechanism 113 comprises a drive unit 113a and a pair of parallel moving members 113b that move in parallel towards or away from each other by the drive unit 113a. The hand claws 111a and 111b are fixed to these pair of parallel moving members 113b, respectively. As a result, the hand claws 111a and 111b are configured to open and close by moving integrally with the pair of parallel moving members 113b. For the drive unit 113a in this embodiment, for example, a parallel opening / closing type air chuck can be suitably applied. By adopting such a configuration, the hand 111 is configured as a parallel hand. However, by adopting a pivot-opening / closing type air chuck as the configuration of the drive unit, the pair of hand claws can also be configured to open and close around a pivot point. Furthermore, using a parallel hand allows for more accurate gripping of the object being conveyed, thus further suppressing damage to the object being conveyed. In addition, various known technologies can be adopted as the power source, such as a configuration that uses hydraulics or an electric power, rather than a configuration that uses pneumatics.

[0032] Furthermore, the opening / closing mechanism 113 includes a first connecting member 113c fixed to one of the pair of parallel moving members 113b and a projection 112a1 integrally provided on the bucket component 112a. The opening / closing mechanism 113 also includes a second connecting member 113d fixed to the other of the pair of parallel moving members 113b, and a third connecting member 113e pivotally supported (rotatably) relative to the second connecting member 113d and fixed to a projection 112b1 integrally provided on the bucket component 112b. In addition, the opening / closing mechanism 113 includes a link member 113f pivotally supported (rotatably) relative to the first connecting member 113c and the third connecting member 113e. With the above configuration, the bucket components 112a and 112b open and close as the pair of parallel moving members 113b move. In this embodiment, the bucket component 112a performs only parallel movement, while the bucket component 112b performs both parallel movement and rotational (oscillating) movement around the pivot point supported by the link member 113f.

[0033] The first moving mechanism 120 includes a support member 121 that supports the first transport unit 110, and a support shaft 122 whose one end is fixed to the support member 121 and which is configured to move reciprocatingly and rotationally (oscillate). The first moving mechanism 120 also includes a rotation mechanism 123 for rotating (oscillating) the support shaft 122, a support member 123a that supports the rotation mechanism 123, a reciprocating member 124 for moving the support member 123a back and forth, and a power source 125 therefor. The rotation mechanism 123 can be configured by, for example, a motor. Furthermore, various known technologies such as a ball screw mechanism or a rack and pinion mechanism can be used as a mechanism for moving the support member 123a back and forth in the Z-axis direction. When a ball screw mechanism is used, the reciprocating member 124 is configured by a ball screw shaft or the like, and the power source 125 is configured by a motor or the like. With the above configuration, the first moving mechanism 120 can move the first transport unit 110 in the Z-axis direction and rotate (oscillate) the first transport unit 110 around the support shaft 122.

[0034] <Second Conveying Device> The second conveying device 200 will be described with reference to Figure 4. Figure 4(a) is a plan view of the second conveying device 200, Figure 4(b) is a front view of the second conveying device 200, and Figure 4(c) is a side view of the second conveying device 200. The second conveying device 200 includes a second conveying unit 210 which integrally includes a gripping section for gripping a first conveyed object and a placement section for placing a second conveyed object, and a second moving mechanism 220 for moving the second conveying unit 210. The second moving mechanism 220 can move the second conveying unit 210 while gripping the first conveyed object, or placing the second conveyed object, or while gripping the first conveyed object and placing the second conveyed object. However, depending on the dimensions of the first and second conveyed objects, it may be possible to convey only one of them.

[0035] The second conveying unit 210 is equipped with a support member 211 that supports the gripping portion and the mounting portion. The gripping portion has a hand 212 composed of a pair of openable and closable hand claws 212a and 212b. The inner shape of the hand claws 212a and 212b is formed according to the outer shape of the first conveyed object in order to grip the first conveyed object. These hand claws 212a and 212b are configured to move in parallel (movement in the Y-axis direction) in a direction toward or toward each other by a drive unit 212X. Thus, the hand 212 in the second conveying unit 210 is a parallel hand, similar to the hand 111 in the first conveying unit 110. The same applies to the drive unit 212X as to the first conveying unit 110 in that a parallel opening and closing type air chuck can be suitably applied. Also, the same applies to the first conveying unit 110 in that a pivot opening and closing type air chuck can be adopted as the configuration of the drive unit, and various known technologies such as pneumatic, hydraulic, and electric power can be adopted as the power source.

[0036] Furthermore, the mounting section is composed of a bucket 213 fixed to a support member 211. Unlike the openable / closable bucket in the first transport unit 110, the bucket 213 in the second transport unit 210 is simply fixed to the support member 211.

[0037] The second moving mechanism 220 includes a guide member 221 that guides the reciprocating movement of the support member 211, a reciprocating member 222 for moving the support member 211 back and forth, and a power source 223 for the same. As a mechanism for moving the support member 211 back and forth in the Z-axis direction, for example, a mechanism using a chain or belt can be employed. In this case, the reciprocating member 222 is made up of a chain or belt, and the power source 223 is made up of a motor or the like. Of course, it is not limited to such mechanisms, and various known technologies such as air cylinders, ball screw mechanisms, and rack and pinion mechanisms can also be employed.

[0038] <Machine Tool Operation> The operation of machine tool 1 will be explained in order of steps, referring to Figures 5 to 14. In each figure, in order to make the operation of each component easier to understand, components that are not directly related to the operation in each step have been omitted as appropriate.

[0039] <<Processing Operation>> First, the workpiece 50 is inserted in the +Z axis direction into a through hole provided in the first spindle 31 by a supply device (not shown) (see arrow A in Figure 5(a)) and held by the first chuck 33. Then, the workpiece 50 rotates together with the first spindle 31 by the first rotation mechanism 32, and processing is performed by the tool 21A on the first tool post 20A (see Figure 5(a)). As a result, a portion of one end of the workpiece 50 held by the first spindle 31 is processed. This partially processed portion is called workpiece 51. Then, one end of this workpiece 51 is held by the second spindle 41. That is, after processing by the tool 21A on the first tool post 20A is completed, the second spindle 41 moves in the -Z axis direction by the reciprocating member 44 and power source 45, and the workpiece 51 is held by the second chuck 43 (see Figure 5(b)).

[0040] In this way, with the material 51 held by the first spindle 31 and the second spindle 41, the material 51 is cut by parting off using the parting tool 21C on the first tool post 20A (see Figure 6(a)). After the material 51 is cut, the workpiece held by the second spindle 41 (the workpiece with the +Z axis side processed) is called the intermediate workpiece 52, and the member held by the first spindle 31 is called the material 53. After the material 51 is cut, the second spindle 41 moves in the +Z axis direction by the reciprocating member 44 and the power source 45. Then, the intermediate workpiece 52 rotates together with the second spindle 41 by the second rotation mechanism 42, and is machined by the tool 21B on the second tool post 20B (see Figure 6(b)), and the final workpiece 54 is obtained. If, after the material 51 has been cut, there is still enough unprocessed material remaining to obtain the final product 54, the process shown in Figures 5 and 6 is repeated for the material 53. Then, the portion of the material 53 that will become the final product 54 is cut from the material 53 and held by the first spindle 31. The portion that does not remain enough to obtain the final product 54 becomes the waste material 55, which is then discarded (see Figures 11 and later described later). The final product 54 is the first item to be transported, and the waste material 55 is the second item to be transported.

[0041] <<Transportation Operation>> In the first transport device 100, the first transport unit 110 is configured to move between a receiving position, where it receives the workpiece processed by the tool 21 from the spindle, and a discharge start position, where it discharges the workpiece outside the machine, via the first moving mechanism 120. In this embodiment, after the processing operation is completed, the first transport unit 110 first receives the final workpiece 54, which is the first workpiece, at the receiving position and carries it to the discharge start position. This operation will be explained with reference to Figures 7 to 9.

[0042] After the processing is completed, the first transfer unit 110 together with the support member 121 is moved from the initial position to a predetermined position in the -Z axis direction by the reciprocating member 124 and the power source 125 (see Fig. 7(a)). Then, by rotating (swinging) the support shaft 122, the open hand claws 111a and 111b are moved to a position (receiving position) where they can sandwich the final workpiece 54 (see Fig. 7(b)). In Fig. 7(b), the dotted line indicates the state immediately after the first transfer unit 110 has moved to the above-mentioned predetermined position, and the solid line indicates the state where the first transfer unit 110 has rotated to the receiving position. Then, the hand claws 111a and 111b are closed, and the final workpiece 54 is sandwiched (see Fig. 8(a)).

[0043] Here, in this embodiment, when the opening / closing type bucket 112 is viewed in the direction parallel to the axis of the main shaft (Z axis direction) with the hand 111 in the closed state, the opening range of the hand 111 (see the range A1 indicated by the dotted line in Fig. 2) is included within the opening range of the opening / closing type bucket 112 (see the range A2 indicated by the dotted line in Fig. 2). Thus, even when the final workpiece 54 is long and enters the opening / closing type bucket 112, the opening / closing type bucket 112 does not contact (interfere) with the final workpiece 54.

[0044] Thereafter, the final workpiece 54 is released from the gripping by the second chuck 43, and the first transfer unit 110 together with the support member 121 is moved in the -Z axis direction by the reciprocating member 124 and the power source 125, thereby moving away from the second main shaft 41 (see Fig. 8(b)). Then, by rotating (swinging) the support shaft 122, the first transfer unit 110 together with the support member 121 is moved in the +X axis direction (from the solid line position to the dotted line position in Fig. 9(a)). Thereafter, the first transfer unit 110 together with the support member 121 is moved to a predetermined position (carry-out start position) in the +Z axis direction by the reciprocating member 124 and the power source 125 (see Fig. 9(b)). As a result, the final workpiece 54 is disposed between the pair of open hand claws 212a and 212b in the second transfer unit 210.

[0045] The second conveying device 200 is configured such that the second conveying unit 210 can move between a discharge start position for transporting the workpiece processed by the tool 21 outside the machine and a discharge position outside the machine, via a second moving mechanism 220. The final workpiece 54, transported to the discharge start position by the first conveying device 100, is then transported to the discharge position outside the machine by the second conveying device 200. This operation will be explained with reference to Figure 10.

[0046] As described above, after the final workpiece 54 is transported to the discharge start position by the first transport device 100, the hand 212 in the second transport unit 210 closes, and the final workpiece 54 is gripped by a pair of hand claws 212a and 212b (see Figure 10(a)). Then, after the hand 111 in the first transport unit 110 opens, the second transport unit 210 moves in the +Z direction by the reciprocating movement member 222 and the power source 223, and the final workpiece 54 is transported to the discharge position outside the machine (see Figure 10(b)).

[0047] Next, the conveying operation of the residual material 55, which is the second conveyed object, will be described. After the processing of the last final processed product 54 that can be obtained from the raw material 50 is completed and it is carried outside the machine, the first conveying unit 110 together with the support member 121 is moved to a predetermined position in the -Z axis direction by the reciprocating movement member 124 and the power source 125 (in FIG. 11(a), it moves from the solid line position to the dotted line position). Then, by rotating (swinging) the support shaft 122, the opened bucket constituent members 112a and 112b move to a position (receiving position) where they sandwich the residual material 55 (in FIG. 11(b), it moves from the dotted line position to the solid line position). Then, the bucket constituent members 112a and 112b close, the residual material 55 is released from being gripped by the first chuck 33, is pushed out from the first spindle 31 and falls, and is placed on the bucket constituent member 112a (see FIG. 12(a)). Then, by rotating (swinging) the support shaft 122, the first conveying unit 110 together with the support member 121 moves in the +X axis direction (see FIG. 12(b)). Even in this state, as shown in the figure, the residual material 55 is placed on the opening / closing type bucket. After that, by the reciprocating movement member 124 and the power source 125, the first conveying unit 110 together with the support member 121 moves to a predetermined position (carry-out start position) in the +Z axis direction (see FIG. 13(a)). As a result, the residual material 55 is disposed directly above the bucket 213 in the second conveying unit 210.

[0048] Thus, after the residual material 55 is carried to the discharge start position by the first conveying device 100, the hand 111 in the first conveying unit 110 opens, and the residual material 55 falls and is placed on the bucket 213 (see FIG. 13(b)). After that, by the reciprocating movement member 222 and the power source 223, the second conveying unit 210 moves in the +Z axis direction, and the residual material 55 is carried to the discharge position outside the machine (see FIG. 14).

[0049] <Advantages of the machine tool according to this embodiment> According to the machine tool 1 of this embodiment, the first object to be transported (final processed product 54 in this embodiment) and the second object to be transported (remaining material 55 in this embodiment) can be selectively transported without changing or removing any components for transporting the object to be transported. Therefore, the production process time can be shortened and productivity can be improved. In addition, power consumption can be reduced, which can contribute to reducing the environmental burden.

[0050] Furthermore, since the second object to be transported is transported while being placed on it, there is a great deal of flexibility regarding the dimensions and shape of the transportable second object. In particular, as in this embodiment, when the second object to be transported is leftover material 55, damage to the leftover material itself is not a particular problem, so there is no problem in transporting it while being placed on it. Therefore, compared to a configuration in which the object is transported while being held, the transport mechanism can be constructed with a simpler configuration, and costs can be reduced.

[0051] Furthermore, in the first conveying device 100, the hand 111 is positioned on the second main shaft 41 side to receive the first conveyed object, and the opening / closing bucket 112 is positioned on the first main shaft 31 side relative to the hand 111. This allows the first and second conveyed objects to be received from the main shaft, respectively, without the need to change parts or perform complex operations. Although not specifically described in the above embodiment, depending on the dimensions of the first and second conveyed objects, it is also possible to receive the first conveyed object with the hand 111 and the second conveyed object with the opening / closing bucket 112 (the order of receiving them does not matter), and then convey them simultaneously.

[0052] Furthermore, in this embodiment, the hand 111 is provided with a pair of hand claws (hand claws 111a, 111b, and a pair of hand claws 212a, 212b) formed according to the outer shape of the first object to be conveyed. Therefore, the first object to be conveyed can be gripped more securely while suppressing the load on the first object to be conveyed. In particular, in this embodiment, the first object to be conveyed is the final processed product 54 (usually corresponding to the finished product), and damage to the final processed product 54 can be suppressed. Also, as described above, by adopting a parallel hand as the hand 111, damage to the final processed product 54 can be suppressed even further.

[0053] In the above embodiment, the first object to be conveyed is the final processed product 54 and the second object to be conveyed is the leftover material 55. However, the first and second objects to be conveyed are not particularly limited. For example, the first and second objects to be conveyed may be different types of final processed products.

[0054] 1: Machine tool 10: Housing 11: Space 20A: First tool post 20B: Second tool post 21, 21A, 21B, 21C: Tool 22: Holding member 23: Tool post body 30: First spindle mechanism 31: First spindle 32: First rotation mechanism 33: First chuck 40: Second spindle mechanism 41: Second spindle 42: Second rotation mechanism 42a: Support member 43: Second chuck 44: Reciprocating member 45: Power source 50: Material 51: Material 52: Intermediate workpiece 53: Material 54: Final workpiece 55: Remaining material 100: First conveying device 110: First conveying unit 111 Hand 111a, 111b: Hand claws 112 Open / close bucket 112a, 112b: Bucket components 112a1, 112b1: Protruding parts 113: Opening / closing mechanism 113a: Drive unit 113b: Parallel movement member 113c: First connecting member 113d: Second connecting member 113e: Third connecting member 113f: Link member 120: First movement mechanism 121: Support member 122: Support shaft 123: Rotation mechanism 123a: Support member 124: Reciprocating movement member 125: Power source 200: Second conveying device 210: Second conveying unit 211: Support member 212: Hand 212a, 212b: Hand claws 212X: Drive unit 213: Bucket 220: Second movement mechanism 221: Guide member 222: Reciprocating movement member 223: Power source A1: Opening range of the hand A2: Opening range of the retractable bucket

Claims

1. A machine tool equipped with a conveying device for conveying objects, wherein the objects to be conveyed include a first object to be conveyed and a second object to be conveyed that is different from the first object to be conveyed, and the conveying device comprises a conveying unit integrally comprising a gripping portion for gripping the first object to be conveyed and a mounting portion for placing the second object to be conveyed, and a moving mechanism for moving the conveying unit while gripping the first object to be conveyed, or placing the second object to be conveyed, or while gripping the first object to be conveyed and placing the second object to be conveyed.

2. The machine tool according to claim 1, comprising a spindle and a tool for machining a workpiece attached to the spindle, wherein a first conveying device is provided as the conveying device, and the first conveying device is configured such that the conveying unit is movable between a receiving position for receiving the workpiece after it has been machined by the tool from the spindle and a discharge start position for discharge the workpiece outside the machine, by means of the moving mechanism.

3. The machine tool according to claim 2, wherein the first conveying device has a gripping section having a hand configured to be openable and closable, and the mounting section has an openable and closable bucket having a bucket component that is connected to the hand and works integrally with the hand.

4. The machine tool according to claim 3, characterized in that the hand is provided with a pair of hand claws formed according to the outer shape of the first object to be conveyed.

5. The machine tool according to claim 3 or 4, characterized in that the hand is a parallel hand that moves in parallel.

6. The machine tool according to claim 2, wherein the spindle includes a first spindle to which the workpiece is attached, and a second spindle provided coaxially with the first spindle, and which grips the other end of the workpiece after a portion of the workpiece gripped by the first spindle has been processed, and the first workpiece is the final workpiece obtained by further processing the workpiece after the workpiece has been cut from the unprocessed portion of the workpiece that is gripped by the second spindle, and the second workpiece is the remaining material after the portion that will become the final workpiece has been cut from the workpiece gripped by the first spindle.

7. The machine tool according to claim 3, characterized in that the opening and closing bucket is positioned on the main shaft side relative to the hand.

8. The machine tool according to claim 3, characterized in that the hand grips and transports the first object to be transported, and the opening / closing bucket places and transports the second object to be transported.

9. The machine tool according to claim 3, characterized in that when the hand is closed and the opening / closing bucket is viewed in a direction parallel to the axis of the main spindle, the opening range of the hand is included within the opening range of the opening / closing bucket.

10. The machine tool according to claim 1, comprising a spindle and a tool for machining a workpiece attached to the spindle, wherein a second transport device is provided as the transport device, and the transport unit of the second transport device is configured to be movable between a transport start position for transporting the workpiece, after it has been machined by the tool, outside the machine and a discharge position outside the machine, by means of the moving mechanism.

11. The machine tool according to claim 10, wherein the second conveying device comprises a support member that supports the clamping portion and the mounting portion, the clamping portion has a hand configured to be openable and closable, and the mounting portion comprises a bucket fixed to the support member.

12. The machine tool according to claim 11, characterized in that the hand is provided with a pair of hand claws formed according to the outer shape of the first object to be conveyed.

13. The machine tool according to claim 11 or 12, characterized in that the hand is a parallel hand that moves in parallel.

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