JP7244264B2 - Machine Tools - Google Patents

Description

The present invention relates to machine tools.

2. Description of the Related Art Machine tools that have a tool magazine capable of storing a plurality of tools and automatically change tools attached to a spindle are conventionally known (see, for example, Patent Documents 1 to 3). The machine tools of Patent Documents 1 to 3 are provided with a tool identification function.
Also, there is known a method of judging incorrect setting of a tool to a tool holder using a jig (see, for example, Patent Document 4).

JP-A-60-009628 Japanese Utility Model Laid-Open No. 54-109978 Japanese Utility Model Laid-Open No. 52-040077 JP 2018-144121 A

A machine tool having an automatic tool changing function generally uses a tool having a pull stud at its proximal end for fixing the tool to a spindle. There are multiple types of pull studs. The spindle is adapted to a given type of pull stud having a given shape and dimensions, and is designed to hold the given type of pull stud with a given fixing force. However, a non-conforming pull stud may still be attachable to the main shaft, for example, if the non-conforming pull stud is similar to a non-conforming pull stud.

Tool magazines, on the other hand, can be loaded with tools regardless of the shape and size of the pull stud. None of the '199 patents--'4 patents disclose preventing the installation of non-conforming pull studs in the tool magazine. If a tool with a mismatched pull stud is accidentally installed in the tool magazine, the tool with the mismatched pull stud will be installed on the spindle. If a tool with an unsuitable pull stud is attached to the main spindle, the fixing force of the tool by the main spindle is reduced, which may lead to problems such as poor machining.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a machine tool that can prevent a tool having a pull stud that does not match the spindle from being erroneously attached to the tool magazine. With the goal.

In order to achieve the above object, the present invention provides the following means.
One aspect of the present invention is a machine tool for machining a work using a tool having a pull stud at its base end, comprising: a tool magazine having a plurality of tool holders to which tools can be attached and detached; a spindle for holding the tool during machining; and a pull stud identification section for identifying the pull stud of the tool when the tool is attached to the tool holder, wherein the spindle is compatible with a predetermined type of the pull stud. and the pull stud identification unit is a machine tool that identifies whether the pull stud is of the predetermined type.

A plurality of tools attached to a plurality of tool holding portions of a tool magazine are alternatively attached to a spindle, and a work is machined by the tools held on the spindle.
The spindle is suitable for a given type of pull stud and can stably hold the given type of pull stud, but it may not be able to stably hold a pull stud that is not of the given type. be. According to this aspect, when a tool is attached to the tool holding section, the pull stud identification section identifies whether or not the pull stud of the tool is of a predetermined type to which the spindle is compatible. Therefore, it is possible to prevent a tool having a pull stud that does not match the spindle from being accidentally installed in the tool magazine.

In one embodiment of the above aspect, the pull stud identifier identifies the shape and dimensions of the pull stud, thereby whether the pull stud is of the predetermined type having a predetermined shape and predetermined dimensions. identify.
In one embodiment of the above aspect, the pull stud identifier has a hole or groove for identifying the shape and size of the pull stud, and the pull stud of the predetermined type is inserted into the hole or groove. It is possible that the pull stud, which is not of the predetermined type, interferes with the perimeter of the hole or groove.
According to this configuration, it is possible to identify whether or not the pull stud is of the predetermined type by simply confirming whether or not the pull stud can be inserted into the hole or groove.

In the above aspect, the tool holding section can mount the tool in a predetermined mounting direction from one side of the tool magazine to the other side, and the pull stud identification section is located on the one side of the tool holding section. and the hole or groove may pass through in the predetermined mounting direction.
According to this configuration, the pull stud identification portion is arranged on the moving path of the tool when attaching the tool to the tool holding portion. Certain types of pull studs can pass through the holes or grooves and attach to the tool holder, while pull studs that are not of the predetermined type cannot pass through the holes or grooves and cannot attach to the tool holder. In this way, the type of pull stud can be identified at the same time as the operation of attaching the tool to the tool holding portion, and no additional operation is required for identification of the pull stud.

In the above aspect, the tool magazine can alternatively arrange the plurality of tool holding portions at predetermined tool attachment/detachment positions, and the pull stud identification portion is configured to identify the one of the tool holding portions at the tool attachment/detachment positions. may be placed on the side.
In the case of a tool magazine that attaches and detaches tools to and from the tool holding portion at a predetermined tool loading/unloading position, a single pull stud identifier located at the tool loading/unloading position can be used to attach to multiple tool holding portions. The pull stud of the tool can be identified.

In the above aspect, the pull stud identifier may prevent attachment of the tool to the tool holding portion if the pull stud does not pass through the hole or groove.
With this configuration, only tools whose pull studs have passed through the holes or grooves can be permitted to be attached to the tool holder.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to prevent a tool having a pull stud that does not match the spindle from being erroneously installed in the tool magazine.

1 is a schematic front view of a machine tool according to one embodiment of the present invention; FIG. 2 is a schematic side view of the machine tool of FIG. 1; FIG. 2 is a schematic side view of a tool used in the machine tool of FIG. 1; FIG. FIG. 2 is a front view of a tool magazine of the machine tool of FIG. 1; Figure 5 is a side view of the tool magazine of Figure 4; FIG. 5 is a perspective view showing the internal configuration of the tool magazine in FIG. 4, and is a view for explaining a method of attaching tools to a tool holding portion; 7 is a rear view of the tool and pull stud identifier of FIG. 6; FIG. FIG. 3 is a vertical cross-sectional view showing the internal configuration of the main shaft; FIG. 4 is a side view of an example of a pull stud that is not of a given type;

A machine tool 1 according to an embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, a machine tool 1 according to this embodiment includes a bed 2, a table 3 to which a work W is fixed, a tool magazine 4 for storing a plurality of tools 20, and a tool magazine 4. A spindle 5 for alternatively holding a plurality of tools 20 housed therein, a spindle head 6 for supporting the spindle 5, and a pull stud identifier 7 provided in the tool magazine 4 (see FIGS. 6 and 7). and have. The machine tool 1 has a function of automatically exchanging tools 20 between the tool magazine 4 and the spindle 5 .

The bed 2 is installed at the place of use of the machine tool 1 using leveling bolts, for example. A table 3 is arranged on the bed 2, and a workpiece W is fixed on the upper surface of the table 3 by arbitrary fixing means. The table 3 and the work W are horizontally moved integrally with respect to the main shaft 5 by a feed motor (not shown) provided on the bed 2 . A column 8 fixed to the bed 2 and extending vertically upward from the bed 2 is provided on the back side of the table 3 . Tool magazine 4 and spindle head 6 are supported on the upper end of column 8 , and tool magazine 4 , spindle 5 and spindle head 6 are arranged above table 3 .

FIG. 3 shows a side view of the tool 20. FIG. As shown in FIG. 3 , the tool 20 has a tool body 21 and a tool holder 22 that holds the tool body 21 .
The tool body 21 is a part that contacts and processes the work W, and is any type of tool such as a drill, a tap, or a milling cutter.
The tool holder 22 includes a pull stud 23 held by the spindle 5, a shank 24, and a flange portion 25 held by a tool holding portion 9 (described later) of the tool magazine 4 in this order from the base end to the tip end. , and a collet 26 that holds the tool body 21 .

The pull stud 23 has a head 23 a and a shank 23 b extending along the longitudinal axis of the tool 20 and connecting the head 23 a and the shank 24 . The outer diameter of the head portion 23a is larger than the outer diameter of the shaft portion 23b, and taper surfaces 23c and 23d are provided on the proximal end side and the distal end side of the head portion 23a. The tapered surface 23c on the proximal end side is a cylindrical surface whose diameter gradually decreases from the distal end side to the proximal end side. The tapered surface 23d on the distal end side is a cylindrical surface whose diameter gradually decreases from the proximal end side to the distal end side.

A shank 24 extends along the longitudinal axis of the tool 20 and connects the pull stud 23 and the flange portion 25 . The shank 24 is a tapered shank whose diameter gradually decreases from the distal end to the proximal end.
The flange portion 25 has a substantially columnar shape with an outer diameter larger than that of the proximal end of the shank 24 . The outer peripheral surface of the flange portion 25 is formed with a groove 25 a extending in the circumferential direction for the tool holding portion 9 to hold the tool 20 .

4 and 5 show the appearance of the tool magazine 4, and FIG. 6 shows the internal structure of the tool magazine 4. As shown in FIG. The tool magazine 4 has a substantially circular box shape. The tool magazine 4 includes a plurality of tool holding portions 9 (see FIG. 6) arranged at intervals in the circumferential direction, a front cover 10 and a rear cover 11 (see FIGS. 4 and 5) covering the plurality of tool holding portions 9. ) and .

As shown in FIGS. 4 and 5, the front cover 10 includes a substantially disk-shaped front panel 10a arranged on the front side of the tool magazine 4, and a substantially annular front panel 10a arranged on the side surface side of the tool magazine 4. It is composed of a side panel 10b. The rear cover 11 is composed of a substantially disk-shaped rear panel arranged on the rear side of the tool magazine 4 . At a position corresponding to each tool holding portion 9 of the side panel 10b, there is an opening 10c which radially communicates between the inside and outside of the covers 10 and 11 and through which the tool 20 held by each tool holding portion 9 passes. formed.

The front cover 10 and the plurality of tool holders 9 are integrally rotated about the central axis of the tool magazine 4 by a rotary motor (not shown). By rotating the plurality of tool holding portions 9, the plurality of tool holding portions 9 are alternatively arranged at the predetermined tool attaching/detaching positions P. As shown in FIG. As shown in FIG. 5, the rear cover 11 has a recess 11a at the tool attaching/detaching position P, which is recessed on the side opposite to the front panel 10a. The opening 10c and the recess 11a of the tool mounting/removing position P secure a work space for the operator to attach and detach the tool 20 to/from the tool holding portion 9 at the tool mounting/removing position P.
Further, by rotating the plurality of tool holders 9 , the plurality of tool holders 9 are alternatively positioned at the tool exchange position near the spindle head 6 . The machine tool 1 replaces the tool 20 held by the spindle 5 by exchanging the tool 20 between the tool holder 9 at the tool exchange position and the spindle 5 .

6 and 7 show configuration examples of the tool holder 9. FIG. The tool holding portion 9 holds the tool 20 on the flange portion 25 with the tip of the tool body 21 facing radially outward of the tool magazine 4 . A tool 20 is attached to the tool holding portion 9 in a predetermined attachment direction A from the back side (one side) to the front side (the other side). In FIG. 7, the mounting direction A is the direction from the front side to the back side of the paper surface.
Specifically, as shown in FIGS. 6 and 7, each tool holding portion 9 includes a substantially semicircular concave portion 12 that receives the flange portion 25 in the mounting direction A and supports the front side of the flange portion 25; A pair of rollers 13a and 13b for supporting the rear side of the flange portion 25 inside 12, and an urging member 14 such as a spring for urging the pair of rollers 13a and 13b to approach each other in the closing direction. .

Each roller 13a, 13b has a center axis substantially parallel to the center axis of the flange portion 25 in the recess 12, and is rotatably supported around each center axis. The pair of rollers 13a and 13b are fitted in the grooves 25a of the flange portion 25 and support the flange portion 25 at two points in the circumferential direction. Also, the pair of rollers 13a and 13b can move in the opening direction away from each other against the biasing force of the biasing member .

The pair of rollers 13 a and 13 b are rotated and opened by the flange portion 25 moving in the mounting direction A toward the recess 12 , so that the flange portion 25 is inserted into the recess 12 . When the flange portion 25 is placed in the recess 12 , the pair of rollers 13 a and 13 b are closed by the biasing force of the biasing member 14 . When the pair of rollers 13a and 13b are closed, the flange portion 25 in the recess 12 is supported by the inner surface of the recess 12 and the pair of rollers 13a and 13b and is stably held in the recess 12. As shown in FIG.
Further, when the flange portion 25 in the recess 12 moves in the direction opposite to the mounting direction A, the pair of rollers 13a and 13b are opened while being rotated, so that the flange portion 25 is pulled out into the recess 12. there is

The spindle head 6 is a member having a cylindrical portion extending in the vertical direction, and is supported by the column 8 so as to be vertically movable. The spindle 5 is arranged vertically in a spindle head 6 and supported by the spindle head 6 so as to be rotatable about the longitudinal axis of the spindle 5 . The spindle head 6 , the spindle 5 and the tool 20 are vertically moved integrally with respect to the table 3 and the workpiece W by a feed motor (not shown) provided on the column 8 . Also, the spindle 5 and the tool 20 are integrally rotated about the longitudinal axis by a spindle motor connected to the upper end of the spindle 5 .
The machine tool 1 processes the work W with the tool body 21 of the rotating tool 20 while relatively moving the work W and the rotating tool 20 by moving the table 3 in the horizontal direction and moving the spindle head 6 in the vertical direction. .

FIG. 8 shows the internal structure of the main shaft 5. As shown in FIG. As shown in FIG. 8 , the pull stud 23 and the shank 24 are inserted into the main shaft 5 from the lower end side, and the pull stud 23 is held by the main shaft 5 . Specifically, the spindle 5 includes a cylindrical spindle main body 15 and a fixing mechanism provided in the main spindle main body 15 for fixing the tool 20 to the main spindle main body 15 .
The inner surface 15 a of the lower end portion of the spindle body 15 on which the shank 24 is arranged is tapered to fit the outer surface of the shank 24 .

The fixing mechanism has a shaft 16 extending vertically in the spindle body 15 and a spring 17 pulling the shaft 16 vertically upward. The pull stud 23 is inserted into the cylindrical lower end portion 16a of the shaft 16, and the head portion 23a is supported on the tapered surface 23d by the rigid ball 18 held in the lower end portion 16a. The head portion 23a can be inserted into the lower end portion 16a while pressing the rigid ball 18 radially outward.

With the head 23a supported by the rigid ball 18, the tensile force of the spring 17 is applied from the rigid ball 18 to the head 23a via the tapered surface 23d, pulling the tool 20 upward. The tool 20 is fixed with respect to the spindle 5 by this pulling force. Therefore, the magnitude of fixing force of the tool 20 to the spindle 5 differs depending on the type of the pull stud 23 . For example, the fixing force of the tool 20 varies depending on the inclination angle θ of the tapered surface 23d with respect to the longitudinal axis of the tool 20 (see FIG. 3).

The spindle 5 is adapted to a given type of pull stud 23 having a given shape and given dimensions. That is, for a given type of pull stud 23 the spindle 5 exerts a sufficiently strong clamping force of the tool 20 . For example, as shown in FIG. 3, certain types of pull studs 23 have an inclination angle θ of 45°.

The pull stud identifier 7 determines whether the pull stud 23 of the tool 20 is of a predetermined type suitable for the spindle 5 when the tool 20 is attached to the tool holding portion 9 at the tool attaching/detaching position P. It is for identification purposes. 6 and 7, the pull stud identifier 7 is a plate-like member arranged inside the covers 10 and 11 of the tool magazine 4, and has one end for identifying the shape and dimensions of the pull stud 23. A hole or groove 7a (hereinafter referred to as hole 7a) is provided for this purpose.

The hole 7a penetrates the pull stud identification portion 7 in the plate thickness direction, and the pull stud 23 is inserted into the hole 7a in the radial direction of the pull stud 23 . The hole 7a is formed to allow passage of a pull stud 23 of a predetermined type and prohibit passage of a pull stud 23 not of the predetermined type. Specifically, the shape and dimensions of the hole 7a are such that the pull stud 23 of a given type is projected on a plane parallel to the longitudinal axis of the tool 20 when projected perpendicular to the longitudinal axis of the tool 20. It has substantially the same shape and dimensions as the projected image of the stud 23 .

The pull stud identifying portion 7 is arranged on the rear side of the tool holding portion 9 at the tool attaching/detaching position P and fixed to the column 8 . The plate thickness direction of the pull stud identification portion 7 is parallel to the mounting direction A, and the hole 7a penetrates in the mounting direction A. As shown in FIG. The hole 7a is positioned on the moving path of the pull stud 23 when the tool 20 is attached to the tool holding portion 9, and is formed in a predetermined type while the tool 20 is being moved toward the tool holding portion 9 in the attachment direction A. A pull stud 23 passes through the hole 7a. As a result, the tool 20 whose pull stud 23 has passed through the hole 7a can be attached to the tool holding portion 9, but the tool 20 whose pull stud 23 does not pass through the hole 7a cannot identify the pull stud that interferes with the pull stud 23. Attachment to the tool holder 9 is prevented by the portion 7 .

Next, a method for attaching the tool 20 to the tool holder 9 of the tool magazine 4 will be described.
The attachment of the tool 20 to the empty tool holding portion 9 and the replacement of the tool 20 held by the tool holding portion 9 with another tool 20 are manually performed by the operator according to the following procedure.
First, the target tool holder 9 is arranged at the tool attachment/detachment position P by rotating the tool magazine 4 . When replacing the tool 20, next, the tool 20 held by the target tool holding portion 9 is removed.
The tool 20 is then attached to the empty target tool holder 9 . Specifically, the tool holder 22 of the tool 20 is inserted in the radial direction of the tool magazine 4 into the work space formed by the opening 10c and the recess 11a of the tool mounting/removing position P, and the tool 20 is moved in the mounting direction A. Let

If the pull stud 23 of the tool 20 to be installed is of a given type, then within the tool magazine 4 the pull stud 23 passes through the hole 7a of the pull stud identifier 7, as shown in FIGS. After that, the flange portion 25 is inserted into the concave portion 12 while spreading the pair of rollers 13a and 13b. When the flange portion 25 is arranged in the concave portion 12 , the tool 20 is held by the tool holding portion 9 by closing the pair of rollers 13 a and 13 b according to the biasing force of the spring 17 .

On the other hand, if the pull stud 23 of the tool 20 to be attached is not of the predetermined type, the pull stud 23 interferes with the periphery of the hole 7a of the pull stud identification portion 7 in the tool magazine 4 and passes through the hole 7a. Therefore, the operator cannot attach the tool 20 to the tool holder 9 . Also, based on the interference between the pull stud 23 and the pull stud identification portion 7, the operator can reliably recognize that the pull stud 23 of the tool 20 to be attached is not of the predetermined type.

As described above, according to this embodiment, when the tool 20 is attached to the tool holder 9, the pull stud identifier 7 determines whether the pull stud 23 is of a predetermined type to which the spindle 5 is compatible. is identified. In the case of a pull stud 23 that is not of the predetermined type, attachment of the tool 20 to the tool holding portion 9 is blocked by the pull stud identification portion 7 . This prevents a tool 20 having a pull stud 23 that does not match the spindle 5 from being erroneously mounted in the tool magazine 4 .

If a tool 20 having a pull stud 23 that is not of the prescribed type is accidentally attached to the tool magazine 4, the tool 20 may not be properly secured to the spindle 5. For example, as shown in FIG. 9, in the case of the pull stud 23 in which the inclination angle θ′ of the tapered surface 23d is smaller than the inclination angle θ, the fixing force of the tool 20 by the fixing mechanism is reduced, and as a result, the machining by the tool 20 is reduced. Inconvenience such as a decrease in accuracy may occur.
According to this embodiment, since the tool 20 having the unsuitable pull stud 23 is never attached to the tool magazine 4, such inconvenience can be prevented.

In addition, in the case of pull studs 23 that are significantly different in shape and size from the predetermined type, the operator can easily distinguish pull studs 23 that are not of the predetermined type. However, if the pull studs 23 are similar in shape and size to the predetermined type, it is difficult for the operator to distinguish the pull studs 23 that are not of the predetermined type. For example, to distinguish between the predetermined type of pull stud 23 with an inclination angle θ of 45° shown in FIG. 3 and the non-predetermined type pull stud 23 with an inclination angle θ′ of 30° shown in FIG. It is difficult.
According to this embodiment, depending on whether the pull stud 23 can pass through the hole 7a or not, the pull stud 23 similar in shape and size to the predetermined type, as shown in FIG. can be identified.

Moreover, if the pull stud 23 is not of the predetermined type, the operator who is performing the work of attaching the tool 20 to the tool holding portion 9 can be made to surely recognize that fact. In addition, since the pull stud identifying portion 7 is arranged on the moving path of the tool 20 when attaching the tool 20 to the tool holding portion 9, the operator can perform the normal attaching work of the tool 20 to the tool holding portion 9. At the same time, it is possible to confirm whether the pull stud 23 is of a predetermined type. That is, no additional work is required to identify the pull stud 23 .

It is difficult for the operator to see the pull stud 23 and the pull stud identification portion 7 inside the covers 10 and 11 during the operation of attaching the tool 20 to the tool holding portion 9 . The inner surface of the hole 7a may have a tapered shape that gradually widens in the direction opposite to the mounting direction A so that the pull stud 23 can be easily passed through the hole 7a.

In the present embodiment, the single pull stud identification portion 7 is fixed to the tool attaching/detaching position P. may be provided, and the plurality of pull stud identification portions 7 may be configured to rotate integrally with the plurality of tool holding portions 9 .

In this embodiment, the pull stud identifying section 7 is arranged on the moving path of the pull stud 23 in the tool magazine 4, but it may be arranged at another location instead.
For example, the pull stud identifying portion 7 may be arranged at a position where the pull stud 23 is arranged while the tool 20 is held by the tool holding portion 9 . For a given type of pull stud 23, the tool 20 can be properly attached to the tool holding portion 9 because the pull stud 23 fits within the hole 7a while the tool 20 is held in the tool holding portion 9. On the other hand, if the pull stud 23 is not of the predetermined type, the pull stud 23 interferes with the periphery of the hole 7a of the pull stud identification portion 7 and cannot be fitted into the hole 7a. can't In this case, a sensor may be provided to detect whether or not the flange portion 25 is normally arranged within the recess portion 12 . The sensor is, for example, a proximity sensor that detects proximity between the inner surface of the recess 12 and the flange portion 25 .

The pull stud identifier 7 may be arranged independently of the tool magazine 4 and spindle 5 . The location of the pull stud identification section 7 is a location that does not interfere with the table 3, the tool magazine 4, the spindle 5, the spindle head 6, etc. that move during operation of the machine tool 1, and the operator can identify the pull stud 23. A convenient location is selected. For example, the pull stud identifier 7 is fixed to a stand fixed around the bed 2 . The operator confirms that the pull stud 23 of the tool 20 passes through the hole 7 a of the pull stud identification portion 7 and then attaches the tool 20 to the tool holding portion 9 of the tool magazine 4 .
The hole 7a does not have to pass through the pull stud identifying portion 7 in the plate thickness direction. For example, the hole 7a has an inner surface shape complementary to the three-dimensional outer surface shape of the pull stud 23 of the predetermined type, and is formed so that the pull stud 23 of the predetermined type fits approximately halfway in the radial direction. good too.

In this embodiment, whether or not the pull stud 23 is of the predetermined type is identified by whether or not the pull stud 23 passes through the hole 7a. Twenty-three types may be identified.
For example, the pull stud identifier may have a sensor that measures the shape and size of the pull stud 23 placed in place. The sensor is, for example, an image sensor that acquires an image of the pull stud 23 . For example, the pull stud identification section detects attachment of the tool 20 to the tool holding section 9 by a contact sensor or a proximity sensor or the like, and detects the shape and dimensions of the pull stud 23 of the tool 20 held by the tool holding section 9 with an image sensor. may be measured by The pullstud identifier may issue an alert if it determines that the pullstud 23 is not of a predetermined type as a result of shape and size measurements.

In the present embodiment, the attachment and detachment of the tool 20 to and from the tool holding portion 9 are performed by the operator, but instead of this, the attachment and detachment of the tool 20 may be performed by a robot. The robot may be configured to issue an alert if the tool 20 cannot be attached to the tool holder 9 .

REFERENCE SIGNS LIST 1 machine tool 4 tool magazine 5 spindle 7 pull stud identification portion 7a hole 9 tool holding portion 20 tool 23 pull stud A mounting direction P tool attaching/detaching position

Claims (5)

A machine tool that processes a workpiece using a tool having a pull stud at its proximal end,
a tool magazine having a plurality of tool holders to which tools can be attached and detached;
a spindle that holds the tool during machining of the workpiece;
a pull stud identification unit that identifies the pull stud of the tool when the tool is attached to the tool holding unit;
said mandrel being adapted to a given type of said pull stud having a given shape and given dimensions ;
The machine tool, wherein the pull stud identifier identifies the shape and size of the pull stud, thereby identifying whether the pull stud is of the predetermined type. A machine tool that processes a workpiece using a tool having a pull stud at its proximal end,
a tool magazine having a plurality of tool holders to which tools can be attached and detached;
a spindle that holds the tool during machining of the workpiece;
a pull stud identification unit that identifies the pull stud of the tool when the tool is attached to the tool holding unit;
said mandrel being adapted to a predetermined type of said pull stud;
The pull stud identification part identifies whether the pull stud is of the predetermined type and has a hole or groove for identifying the shape and size of the pull stud,
The machine tool, wherein the pull stud of the predetermined type is insertable into the hole or groove, and the pull stud not of the predetermined type interferes with the perimeter of the hole or groove. The tool holder can mount the tool in a predetermined mounting direction from one side of the tool magazine to the other side,
3. A machine tool according to claim 2, wherein said pull stud identification portion is located on said one side of said tool holding portion and said hole or groove extends through said predetermined mounting direction. the tool magazine is capable of alternatively arranging the plurality of tool holders at predetermined tool attaching/detaching positions;
4. A machine tool according to claim 3, wherein said pull stud identification portion is located on said one side of said tool holding portion at said tool loading/unloading position. 5. A machine tool according to claim 3 or 4, wherein said pull stud identification portion prevents attachment of said tool to said tool holding portion in which said pull stud does not pass through said hole or groove.

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