Multitasking machine tool

Abstract

Multitasking machine tool (1) comprising: a first tool holder (9) containing a tool spindle (8) configured to allow a tool (T) to be detachably attached to it, wherein the first tool holder (9) is configured to be displaceable in predetermined directions and to a first tool change area in which the tool (T) attached to the tool spindle (8) of the first tool holder (9) can be exchanged for another tool, and to a second tool change area; a second tool holder (10) configured to allow a tool (S) to be detachably attached to it independently of the attachment or removal of the tool (T) to or from the tool spindle (8) of the first tool holder (9); a tool changer (31, 41, 51, 61) which includes at least one gripper (32a, 32b, 42a, 42b, 52a, 52b, 62a, 62b, 62c, 62d) configured to hold a tool (S) to be attached to the second tool holder (10); and an automatic tool changer configured to change the tool (T) attached to the tool spindle (8) of the first tool holder (9) positioned in the first tool change area, and to detachably attach the tool change part (31, 41, 51, 61) to the tool spindle (8) of the first tool holder (9) positioned in the first tool change area, characterized by the fact that a change of the tool (S) attached to the second tool holder (10) for another tool is carried out by a movement of the first tool holder (9), which is located in the second tool change area with the tool change part (31, 41, 51, 61) attached to the tool spindle (8) of the first tool holder (9), and whose movement includes a displacement of the first tool holder (9) and / or a rotation of the tool spindle (8) of the first tool holder (9).

Description

[0001] This invention relates to a multitasking machine tool comprising a plurality of tool holders and an automatic tool changer configured to change a tool attached to one or more of the tool holders.

[0002] A conventionally known multitasking machine tool with a plurality of tool holders typically includes an automatic tool changer having a tool magazine configured to hold a variety of tools and a tool changing arm configured to be rotatable along an axis extending in a predetermined direction, with a tool attached to the tool holder being automatically interchangeable for any of the tools held in the tool magazine.Among prevalent multitasking machine tools of this type, the most common configuration is such that a tool in a first tool holder is interchangeable by the automatic tool changer, while a second tool holder is configured as a turret head with a multifaceted form. Each side of the turret head has a structure for holding a specific type of tool, different from the tool held on the other side. The type of tool used for machining by the second tool holder can be changed by rotating (i.e., shifting in angular position) the turret head tool holder. However, in this configuration, the multitasking machine tool should be stopped each time one or more tools held in the second tool holder need to be replaced.Therefore, the operation of the multitasking machine tool cannot be continued for an extended period without stopping.

[0003] In this respect, a multitasking machine tool proposed in the publication of Japanese patent application No. 58-160038 (JP S58-160038A) is configured to have an automatic tool changer comprising a tool magazine and a tool changing arm. The automatic tool changer is configured to be movable in predetermined directions, so that it can be used to change any of the tools attached to the first tool holder and the second tool holder.

[0004] The multitasking machine tools of this type, as revealed in JP S58-160038A, would have the disadvantage that the movable feature of the automatic tool changer requires a large mechanism, thus increasing the cost of the machine tool. Consequently, the multitasking machine tool would be larger overall and would require more space at its installation site.

[0005] Document US 2009 / 0116915 A1 discloses a multitasking machine tool comprising a first tool holder with a tool spindle to which a first tool is detachably attached. The first tool holder is displaceable in predetermined directions and can be moved to a tool-changing area in which the first tool attached to the tool spindle of the first tool holder can be exchanged for another tool. The multitasking machine tool further comprises a second tool holder to which a second tool is detachably attached, independently of the attachment or removal of the first tool from or to the tool spindle of the first tool holder. An automatic tool changer is also provided, which changes the tool attached to the tool spindle of the first tool holder positioned in the tool-changing area.

[0006] German patent application DE 100 34 973 A1 discloses a universal machine that has a workpiece carrier that can be moved horizontally, vertically, and rotatably. The universal machine also has a tool magazine mounted on the workpiece carrier, and when the workpiece carrier rotates, tool pockets attached to a disc-shaped base of the tool magazine are repositioned. A tool change is performed by positioning the workpiece carrier with the tool magazine flanged to it by three linear axes in the area of ​​a work spindle.

[0007] The publications DE 298 21 812 U1, AT 287 442 B, DE 33 27 512 A1 and JP S54 - 99 280 A also reveal machine tools with automatic tool changers.

[0008] There is a requirement to provide an improved multitasking machine tool with advantageous features that allow tools attached to a plurality of tool holders to be changed without stopping the operation of the machine tool, and which can be achieved without a significant increase in the size and manufacturing cost of the machine tool.

[0009] The present invention was made in an attempt to eliminate the above disadvantages, and illustrative, non-limiting embodiments of the present invention may overcome the above disadvantages and other disadvantages not described above.

[0010] According to one aspect, a multitasking machine tool is provided, comprising a first tool holder, a second tool holder, a tool changer, and an automatic tool changer. The first tool holder contains a tool spindle configured to allow a tool to be detachably attached to it. The first tool holder is configured to be movable in predetermined directions and to be movable into a first tool changer area, where the tool attached to the tool spindle of the first tool holder can be exchanged for another tool, and into a second tool changer area. The second tool holder is configured to allow a detachably attached tool to be independent of the attachment or removal of the tool from the tool spindle of the first tool holder.The tool changer includes at least one gripper configured to hold a tool to be attached to the second tool holder. The automatic tool changer is configured to change the tool attached to the tool spindle of the first tool holder positioned in the first tool change area and to detachably attach the tool changer to the tool spindle of the first tool holder positioned in the first tool change area. Changing the tool attached to the second tool holder for a different tool is performed by moving the first tool holder, which is located in the second tool change area with the tool changer attached to the tool spindle of the first tool holder, the movement including moving the first tool holder and / or rotating the tool spindle of the first tool holder.

[0011] In this configuration, the tool changer, which includes at least one gripper configured to hold a tool to be attached to the second toolholder, can be attached to the tool spindle of the first toolholder by the automatic tool changer. The tool attached to the second toolholder is changed by moving the first toolholder (with the tool changer attached to the tool spindle) which is located in the second tool changer area (the attached tool is removed and a new tool is attached). More precisely, the first toolholder, with the tool changer attached to its tool spindle, is moved (a translational movement is made) and / or the tool spindle to which the tool changer is attached is rotated.Accordingly, changing the tool attached to the second tool holder can be performed automatically without stopping the multitasking machine tool and without moving the automatic tool changer to a position where the tool attached to the second tool holder can be changed by the automatic tool changer. As a result, miniaturization and a reduction in manufacturing costs of the multitasking machine tool can be achieved.

[0012] The problem is solved by a multitasking machine tool according to the features of claim 1.

[0013] The above aspect, other advantages and further features of the present invention are clarified by a detailed description of illustrative, non-limiting embodiments thereof with reference to the accompanying drawings. Fig. Figure 1 is a schematic representation of a multitasking machine tool from the front. Fig. Figure 2 is a schematic representation of the multitasking machine tool from the right. Fig. Figure 3 is a schematic representation to illustrate the changing of a tool attached to the first tool holder. Fig. Figure 4 is a schematic representation to illustrate the tool attached to a second tool holder. Fig. Figure 5 is a schematic representation to illustrate the changing of a tool attached to the second tool holder. Figures are schematic representations showing a variety of tool change parts for use when changing a tool attached to the second tool holder.

[0014] An illustrative, non-limiting embodiment of the present invention is described below with reference to the accompanying drawings.

[0015] First, with reference to Fig. 1 and Fig. 2. A general structure of a multitasking machine tool 1 is described. An X-axis, a Y-axis, and a Z-axis are three axes perpendicular to each other. In Fig. 1. The X-axis extends in the upward and downward direction, the Y-axis extends in the forward and backward direction, and the Z-axis extends in the left and right direction.

[0016] The multitasking machine tool 1 has two tool holders, a first tool holder 9 and a second tool holder 10. The first tool holder 9 is configured to allow a rotary tool to be attached to it. The second tool holder 10 is configured to allow a tool to be attached to it, the type of tool to be attached to the second tool holder 10 being different from the tool to be attached to the first tool holder 9. The tool can be detachably attached to the second tool holder 10 independently of the attachment and removal of the tool from and from the first tool holder 9. A spindle housing 4 is provided on a bed 2 as a base. The spindle housing 4 contains a main spindle 3, which is configured to rotate an axis extending in the left-right direction.On an upper surface of the bed 2, a Z-axis guide 21 extending in a Z-axis direction is provided in a position closer to the rear, and another Z-axis guide 22 extending in the Z-axis direction is provided in a position closer to the front.

[0017] A bed slide 5 is arranged on the Z-axis guide 21 and configured to be movable in the Z-axis direction. A Y-axis guide 23 extending in the Y-axis direction is provided on an upper surface of the bed slide 5. A column 6 is arranged on the Y-axis guide 23 and configured to be movable in the Y-axis direction. An X-axis guide 24 extending in the X-axis direction is provided on a front surface of the column 6. A tool slide 7 is arranged on the front surface of the column 6 and configured to be movable along the X-axis guide 24 in the X-axis direction. The first tool holder 9 is arranged on a front surface of the tool slide 7 and configured to be rotatable along an axis (B-axis) extending in the forward and backward directions.In this way, the first toolholder 9 is configured to be movable (displaceable) in the X-axis, Y-axis, and Z-axis directions by means of the bed slide 5, the column 6, and the tool slide 7. The first toolholder 9 contains a tool spindle 8 which is configured to be rotatable along an axis extending in the up-and-down directions when the first toolholder 9 is, as shown in . Fig. As shown in Figure 1, the tool spindle is rotated around the B-axis to an angular position of 90° relative to the horizontal. The tool spindle 8 is configured to allow the tool T to be detachably attached to it. The tool T to be attached to the tool spindle 8 is of a type such that the tool T rotates when used for a machining operation (i.e., a rotary tool).

[0018] The second tool holder 10 is arranged on the Z-axis guide 22 and configured to be movable in the Z-axis direction. The second tool holder 10 is configured to allow a tool S to be detachably attached to it. The tool to be attached to the second tool holder 10 is of a type different from the rotary tool T. The second tool holder 10 contains an advance mechanism (not shown) configured to advance the tool S to change its position in the X-axis direction. Accordingly, the second tool holder 10 is configured to be movable in both the X-axis and Z-axis directions. In the present embodiment, the second tool holder 10 is arranged below the first tool holder 9.

[0019] An automatic tool changer is positioned to the left of the first tool holder 9, the tool slide 7, and the column 6. The automatic tool changer includes a tool changer arm 11, a tool magazine (not shown), and a conveyor 12. The tool changer arm 11 is configured to rotate about an axis extending in both left- and right-hand directions. The tool magazine is configured to hold tools of various types. The conveyor 12 is configured to transport tools between the tool changer arm 11 and the tool magazine. The tool changer arm 11 is positioned above the spindle housing 4. The tool changer arm 11 is a known device comprising a pair of arm sections projecting radially from the center in opposite directions.

[0020] The multitasking machine tool 1, as described above, is configured, under the control of an NC device (control device, not shown), to machine the workpiece (not shown) supported by the spindle housing 4 by the first tool holder 9, which moves in the X, Y, and Z axis directions and rotates about the B axis, and by the second tool holder 10, which moves in the X and Z axis directions. In addition to the operation of the first and second tool holders 9 and 10, various other operations, such as the rotational operation of the spindle housing 4, the rotational operation of the tool T attached to the first tool holder 9, and the tool change operation, which will be described later, are performed for a tool attached to each tool holder 9 and 10 under the control of the NC device.

[0021] In order to illustrate the unique features of the present invention, a specific configuration for tool change operation for the first tool holder 9 and for the second tool holder 10 is now described with reference to Fig. 3 to Fig. 6 described. Fig. Figure 3 shows an operation of changing a tool attached to the first tool holder 9. Fig. 4 and Fig. Figure 5 shows an operation of changing a tool attached to the second tool holder 10. Fig. 6A to Fig. Figure 6D shows a variety of tool change parts 31, 41, 51 and 61 for use when changing a tool attached to the second tool holder 10. It should be noted that a representation of the tool change arm 11 in Fig. 4 and Fig. 5 has been omitted for the sake of simplicity.

[0022] To change a tool of the first tool holder 9, a new tool is first provided to be attached to the tool spindle 8 and held against one of the arm sections of the tool changing arm 11. Then the first tool holder 9 is, as in Fig. As shown in Figure 3, the tool is advanced to a position at an angle of 0° (caused to rotate the B-axis), and at the same time, the first tool holder 9 is operated to move in the X-axis, Y-axis, and / or Z-axis direction, so that the tool currently attached to the tool spindle 8 is positioned on a motion path of the end sections of the arm sections, which is generated when the tool change arm 11 is rotated. Afterward, the tool change arm 11 is rotated to cause the tool attached to the tool spindle 8 to be held in the end section of the other arm section (where no tool is held). The first tool holder 9 is then operated again to, for example,The tool changer 11 moves in the Z-axis direction to remove the tool from the tool spindle 8, and then the tool changer arm 11 rotates 180° so that the new tool, held in the end section of one of the arm sections, is positioned to the left of the first tool holder 9. The first tool holder 9 is then moved again, for example, in the Z-axis direction to attach the tool to the tool spindle 8, and the tool changer arm 11 rotates 90° to release the tool (move away from it). Consequently, the tool change operation is complete. This operation refers to the area in which a tool attached to the first tool holder 9 can be exchanged for another tool by the automatic tool changer as the first tool change area.

[0023] On the other hand, to change a tool for the second tool holder 10, a tool is first inserted as described in Fig. The tool change part 31 shown in Figure 6A is caused to be held by one of the arm sections of the tool change arm 11. The tool change part 31 contains a shaft section (not shown) which is located in Fig. 6 extends in a forward and backward direction, and a pair of grippers 32a, 32b are provided at the front end of the shaft section and project radially from it in opposite directions. Each gripper 32a, 32b has a holding section that opens in a rotational direction of the tool changer 31, which is rotatable on an axis of the shaft section. The holding section of gripper 32a and the holding section of gripper 32b have shapes that are rotationally symmetrical to each other with respect to the axis of rotation of the tool changer 31 (the axis of the shaft section thereof).

[0024] In this operation, the tool change part 31, which has been held by the tool change arm 11 until that point, is temporarily attached to the first tool holder 9 in the first tool change area by performing the same operation as described above as when changing a tool attached to the first tool holder 9. The conveyor device 12 is then controlled to, as described above, Fig. Figure 4 shows how to cause a new tool to be held by one of the grippers (e.g., gripper 32a) of the tool changer 31 attached to the first tool holder 9. Then, the first tool holder 9, to which the tool changer 31 is attached, is advanced to a position at an angle of 90° (caused to rotate about the B-axis).Furthermore, the first tool holder 9 is operated to move in the X-axis, Y-axis, and Z-axis directions into a second tool change area. This area is where a tool attached to the second tool holder 10 is to be replaced with a new tool. More precisely, the grippers 32a and 32b move into a position where a tool attached to the second tool holder 10, which is in a predetermined tool change position, can be held by one of the grippers 32a or 32b by rotating the tool spindle 8 of the first tool holder 9 when the first tool holder 9 moves into the second tool change area. At the same time, the second tool holder 10 is operated to move in the X-axis and Z-axis directions to the tool change position for exchanging the tool between the second tool holder 10 and the first tool holder 9.

[0025] The tool spindle 8 of the first tool holder 9 is then rotated in the second tool change area, causing the gripper 32b, which does not hold the tool, to hold the tool attached to the second tool holder 10, ready to be replaced by a new one. Subsequently, the first tool holder 9 is operated, for example, to move in the X-axis direction (i.e., upwards) to remove the tool from the second tool holder 10. Then, after the tool spindle 8 has been rotated and undergone a 180° turn, the first tool holder 9 is moved again in the X-axis direction, but in the opposite direction (i.e., downwards), so that the new tool held by the gripper 32a, as shown in Fig. 5 is shown, inserted into the second tool holder 10, and attached to it. Finally, the tool spindle 8 is rotated and subjected to a 90° turn to move the grippers 32a, 32b to positions where both grippers 32a, 32b are away from the second tool holder 10. In this way, the tool change operation for the second tool holder 10 is completed. Once the tool change operation for the second tool holder 10 is completed in the manner described above, the aforementioned process steps are performed in reverse.This means that the tool attached to the second tool holder is removed from the tool changer 31 by the conveying device 12, then the tool changer 31 is removed from the tool spindle 8 of the first tool holder 9, and a desired tool is attached by performing the same operation as when replacing a tool attached to the first tool holder 9 with a new one.

[0026] In the multitasking machine tool 1 configured as above, the first tool holder 9 contains the tool spindle 8, which is configured to allow a tool to be detachably attached to it. The first tool holder 9 is configured to be displaceable in the X-axis, Y-axis, and Z-axis directions, and to be displaceable into the first tool change area, where the tool attached to the tool spindle 8 of the first tool holder 9 can be exchanged for another tool, and into a second tool change area. The second tool holder 10 is configured to allow a tool to be detachably attached to it, regardless of whether the tool is attached to or removed from the tool spindle 8 of the first tool holder 9. The tool changer 31 contains the grippers 32a and 32b, which are configured to hold a tool to be attached to the second tool holder 10.The automatic tool changer is configured to change the tool attached to the tool spindle 8 of the first tool holder 9, which is positioned in the first tool change area, and to detachably attach the tool changer 31 to the tool spindle 8 of the first tool holder 9, which is positioned in the first tool change area. Changing the tool attached to the second tool holder 10 for another tool is performed by moving the first tool holder 9, which is located in the second tool change area, with the tool changer 31 attached to the tool spindle 8 of the first tool holder 9. This movement includes moving the first tool holder 9 and / or rotating the tool spindle 8 of the first tool holder 9.Accordingly, changing the tool attached to the second tool holder 10 can be performed automatically without stopping the multitasking machine tool 1 and without moving the automatic tool changer to a position where the tool attached to the second tool holder 10 can be changed by the automatic tool changer. As a result, miniaturization and a reduction in the manufacturing costs of the multitasking machine tool 1 can be achieved.

[0027] Since the tool changer 31 includes a pair of grippers 32a, 32b located at the front end of the shaft section extending in the forward and reverse directions, these grippers 32a, 32b also extend radially from the shaft section in opposite directions. Each gripper 32a, 32b has a holding section that opens in one direction of rotation of the tool changer 31, which is rotatable on an axis of the shaft section. In this configuration, a tool attached to the second tool holder 10 can be exchanged for a new one by moving the first tool holder 9 and the second tool holder 10 in the predetermined directions (X-axis, Y-axis, and / or Z-axis) and rotating the tool spindle 8 of the first tool holder 9.In this way, no special movement of the first tool holder 9 and the second tool holder 10 is required for changing the tools, and thus the illustrated aspects of the present invention can be achieved in the existing equipment and are easy to implement.

[0028] The configurations of the multitasking machine tool that comply with the present invention are not limited to the embodiments described above, but it is to be understood that, where appropriate, various modifications and changes to specific configurations, e.g. the basic setup of the multitasking machine tool, the structural features of the tool changing part, the configurations relating to changing the tools and other features, can be made without departing from the scope of the present invention.

[0029] For example, other tool change parts 41, 51, as in the Fig. 6B and Fig. 6C is shown as the tool change part which corresponds to the present invention, which can be assumed to be an alternative to the tool change part 31 which is configured according to the exemplary embodiment described above.

[0030] The tool change part 41, like the tool change part 31, contains a shaft section (not shown) which is located in Fig. 6 extends in a forward and backward direction, and a pair of grippers 42a, 42b are provided at the front end of the shaft section and project radially from it in opposite directions. Each gripper 42a, 42b has a holding section that extends in one direction (upward direction in Fig. 6B) opens, which is perpendicular to the direction of the axis of the shank section and to the direction of the projection of the grippers 42a, 42b. Therefore, the tool attached to the second tool holder 10 is not caused to be held on or released from the grippers 42a, 42b by a rotation of the tool spindle 8, but by causing the first tool holder 9 to move in the direction of the opening of the holding sections of the grippers 42a, 42b when the tool attached to the second tool holder 10 is changed using the tool changer 41.Furthermore, the operation to be performed when changing the positions of two tools attached to the tool changer 41 (after picking up a tool from the second tool holder 10, before a new tool is picked up in the second tool holder 10) above the second tool holder 10 for replacement is not the rotation of the tool spindle 8, but the displacement of the first tool holder 9 in the direction of the projection of the grippers 42a, 42b. To be more precise, after the tool changer 41 is attached to the tool spindle 8, the first tool holder 9 is caused to rotate about the B-axis, and the tool spindle 8 is rotated so that the tool changer 41 is positioned at an angle, e.g., with the opening direction of the holding sections in the Y-axis direction. The tool holder 9 thus angled is moved (displaced) to the second tool changer area.The tool to be replaced, attached to the second tool holder 10 (which is in the tool-change position), is then moved to one of the grippers (e.g., gripper 42b, which is not holding a tool). After the tool has been removed from the second tool holder 10, for example by moving the first tool holder 9 in the X-axis direction (upwards), the first tool holder 9 is moved, for example, in the Z-axis direction (to the right). Then, the first tool holder 9 is moved, for example, in the X-axis direction (downwards), and a new tool, held by gripper 42a, is inserted into and attached to the second tool holder 10. Subsequently, the first tool holder 9 is moved again in the Y-axis direction (backwards) to remove itself from the second tool holder 10. In this way, the tool-change operation for the second tool holder 10 is completed.

[0031] Like the tool change part 31, the tool change part 51 also includes a shank section (not shown) which is located in Fig. 6 extends in the forward and backward directions, and a pair of grippers 52a, 52b are provided at the front end of the shaft section and project radially from it in opposite directions. Each gripper 52a, 52b has a holding section that opens in the direction of the projection of the grippers 52a, 52b (leftward and rightward directions). Therefore, when the tool attached to the second tool holder 10 is changed using the tool changer 51, the tool attached to the second tool holder 10 is caused to be held by or released from the grippers 52a, 52b by causing the first tool holder 9 to move in the opening direction of the holding sections of the grippers 52a, 52b. The positions of two tools attached to the tool change part 51 are changed over the second tool holder 10 for replacement when the tool spindle 8 is rotated.To be more precise, after the tool changer 51 is attached to the tool spindle 8, the first tool holder 9 is caused to rotate about the B-axis, and the tool spindle 8 is rotated so that the tool changer 51 is positioned, for example, in the direction of opening the holding sections angled in the Z-axis direction. The first tool holder 9, thus angled, is moved (shifted) to the second tool change area. This movement of the first tool holder 9 in the Z-axis direction causes the tool to be replaced, attached to the second tool holder 10, to be held by one of the grippers (e.g., gripper 52b, which is not holding a tool). After the tool has been removed from the second tool holder 10, for example, by moving the first tool holder 9 in the X-axis direction (upwards), the tool spindle 8 is rotated and subjected to a 180° turn.The first tool holder 9 is then operated again, for example, to move in the X-axis direction (downwards), whereby a new tool held by the gripper 52a is fitted into and attached to the second tool holder 10. Subsequently, the first tool holder 9 is moved away from the second tool holder 10 in the Z-axis direction. In this way, the tool change operation for the second tool holder 10 is completed.

[0032] In the embodiment described above and in its alternatives, only two grippers are provided in each tool change part. However, as shown in Fig. Figure 6D shows, for example, three or more grippers 62a - 62d (a four-gripper configuration is shown therein) being provided in a single tool change part 61.

[0033] In contrast, a tool changer containing only a gripper can be assumed. In this configuration, the tool change operation for the second tool holder 10 can be performed as described below. After the tool is removed from the second tool holder 10, the first tool holder 9 is caused to return to a position where the automatic tool changer is operating, and tools are exchanged between the automatic tool changer and the first tool holder. Afterward, the first tool holder 9 is caused to return to a position near the second tool holder, and a new tool is attached to the second tool holder 10.

[0034] Furthermore, a third toolholder can be provided in the multitasking machine tool. The second toolholder 10 can be configured as a turret head with a multifaceted design, each side of which has a structure for holding a specific type of tool, different from a tool held on another side of the multifaceted turret head. In addition, the second tool change area and tool change position can be configured as a predetermined area located at a fixed position within the multitasking machine tool. Alternatively, the second tool change area can be configured as an area that is defined at any given time when a tool change operation is necessary, based on the position of the second toolholder 10 at that time.Additionally, the multitasking machine tool can be configured so that not only the first tool holder 9, but also the second tool holder 10 is caused to move when the tool is removed from or inserted into the second tool holder 10.

Claims

[1] Multitasking machine tool (1) comprising: a first tool holder (9) containing a tool spindle (8) configured to allow a tool (T) to be detachably attached to it, wherein the first tool holder (9) is configured to be displaceable in predetermined directions and to a first tool change area in which the tool (T) attached to the tool spindle (8) of the first tool holder (9) can be exchanged for another tool, and to a second tool change area; a second tool holder (10) configured to allow a tool (S) to be detachably attached to it independently of the attachment or removal of the tool (T) to or from the tool spindle (8) of the first tool holder (9); a tool changer (31, 41, 51, 61) which includes at least one gripper (32a, 32b, 42a, 42b, 52a, 52b, 62a, 62b, 62c, 62d) configured to hold a tool (S) to be attached to the second tool holder (10); and an automatic tool changer configured to change the tool (T) attached to the tool spindle (8) of the first tool holder (9) positioned in the first tool change area, and to detachably attach the tool change part (31, 41, 51, 61) to the tool spindle (8) of the first tool holder (9) positioned in the first tool change area, characterized by , that a change of the tool (S) attached to the second tool holder (10) for another tool is carried out by a movement of the first tool holder (9), which is located in the second tool change area with the tool change part (31, 41, 51, 61) attached to the tool spindle (8) of the first tool holder (9), and whose movement includes a displacement of the first tool holder (9) and / or a rotation of the tool spindle (8) of the first tool holder (9).

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