JPH1177468A - Tool clamping/clamp-releasing device for spindle of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely perform manual clamp releasing and clamping without generating unnecessary motion on a tool exchanging arm by providing a part performing clamp releasing and clamping of the cam curve of a cam on a part where motion of the tool exchanging arm is stopped. SOLUTION: A cam 4 is provided with a drum-shaped circumferential contour (cam groove) and both sides (end faces), and it is fixed to a camshaft 44. The cam 4 and the camshaft 44 are rotationally driven by a camshaft driving motor through a gear transmission mechanism. The swing shaft of a tool exchanging arm performs swing motion of 180 degrees by a cam groove 42, and performs reciprocating motion in the axial direction by a cam groove 43. A cam groove 41 moves the reciprocating member of a cylinder for clamp releasing. A changeover part (angle position) of the clamping state and the clamp releasing state of the cam curve of the cam groove 41 is provided in the range of not moving the tool exchanging arm in the cam curve of the cam groove 42 and the cam groove 43.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an NC (numerical control).
In a machine tool controlled by an apparatus and having an automatic tool changer (ATC), a tool clamp and a tool can be manually released from a tool and a spindle.
The present invention relates to a clamp release device.

[0002]

2. Description of the Related Art As an automatic tool changer for automatically changing a tool clamped on a main shaft of a machine tool, a tool changing arm for holding a tool at both ends is provided around a turning axis.
In some cases, the tool change arm is turned by 80 degrees, the tool change arm is moved linearly in the axial direction of the turning shaft, and the tool and the spindle are released and clamped for automatic tool change. These operations are controlled by cams as disclosed in
Techniques such as those described in JP-A-7784 and JP-A-7-164214 are known.

[0003] Japanese Patent Publication No. 5-37784 discloses that a cam having a cam profile on an outer peripheral surface and a cam profile on both side surfaces is used to rotate a tool changing arm, linearly move a tool changing arm in the direction of a turning axis, and clamp a tool and a spindle. What controls release, clamping and tilting of the tool pot is described. Thus, a series of tool changing operations can be performed with simple control. Even in a machine tool having such an automatic tool changer, it may be necessary to manually release the tool clamped on the spindle and remove the tool, or to attach the tool and manually clamp the tool. In preparation for such a case, it is convenient to separately provide a manual tool clamp and a clamp release mechanism.

As a machine tool provided with a manual tool clamp release mechanism, those described in Japanese Patent Application Laid-Open Nos. 7-164214 and 63-2639 are known. Japanese Patent Application Laid-Open No. 7-164214 discloses a machine tool in which a hydraulic cylinder 255 is separately provided as a manual tool clamp releasing mechanism so that a tool can be clamped and unclamped regardless of the operation of a cam for driving the tool clamping mechanism. Are listed. Also, JP-A-63-26
Japanese Patent Publication No. 39 and Japanese Patent Publication No. 7-112484 disclose an air booster type hydraulic supply device 22 and a plate cam type hydraulic supply device 2.
3 is described, and the tool is manually clamped and unclamped by operating the on-off valve 30.

[0005]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open No. 7-1
As described in JP-A-64214, JP-A-63-2639, and JP-B-7-112484, when a manual tool clamp release mechanism is provided separately from the drive mechanism of the automatic tool changer, the hydraulic pressure is increased. There has been a problem that a plurality of supply devices are required and a mechanism becomes complicated, thereby increasing the cost of the machine tool. Further, there is a problem that the reliability of the manual clamp release mechanism may be reduced due to the complicated mechanism.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a tool clamp / clamp release device for a machine tool provided with an automatic tool changer, which can manually release and clamp a tool and a spindle by a simple and highly reliable mechanism. The purpose is to provide.

[0007]

In order to achieve the above object, a tool clamping / unclamping device for a spindle of a machine tool according to the present invention is provided with a pivoting motion about a pivot axis of a tool changing arm of an automatic tool changing device. A cam having a cam curve having a cam curve for continuously performing the linear movement of the tool change arm in the axial direction of the swivel axis, the operation of releasing the tool from the main shaft, and the operation of clamping in a predetermined timing and in a predetermined order. A mechanism, a cam mechanism driving means for driving the cam mechanism, and a cam mechanism driving means for controlling the cam mechanism to stop the cam mechanism at a clamp position and a clamp release position of the tool, and to clamp the cam mechanism at the tool clamp position. Control means for movably controlling each other between the position and the clamp release position.

[0008] In the above-mentioned tool clamping / unclamping device for a spindle of a machine tool, the apparatus is provided on the spindle.
A biasing means for clamping for clamping a tool mounted on a tool mounting portion of the spindle, a fluid pressurizing means provided near the cam mechanism, and pressurizing fluid by operation of the cam mechanism; A clamp releasing cylinder, which is provided on a spindle head for supporting the cylinder and is driven by a pressure fluid from the fluid pressurizing means to release a tool mounted on a tool mounting portion of the spindle; and the fluid pressurizing means. And a fluid passage connecting between the cylinder and the clamp releasing cylinder.

In the above-mentioned tool clamping and unclamping device for a spindle of a machine tool, the cam is provided with a portion for controlling the unclamping operation and the clamping operation of a tool in an area where the tool changing arm does not operate. It is preferable that they are used.

In the above-mentioned tool clamping / unclamping device for a spindle of a machine tool, the control means rotates with the cam and has an uneven portion indicating a rotation angle position of the cam. An angle detecting unit that detects the rotational angle position of the cam by detecting the uneven portion of the angle indicator, and a drive control unit that controls the cam mechanism driving unit based on an output of the angle detecting unit. Preferably, there is.

Further, in the above-mentioned tool clamping / unclamping device for a main spindle of a machine tool, a control motor capable of controlling a rotation angle position of the cam can be used as the cam mechanism driving means.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the tool clamp and the tool of the present invention.
It is a sectional view showing composition of a main shaft of a machine tool to which a clamp release device is applied. The tip of the spindle 1 is configured as a tool mounting portion 1a so that the tool 3 can be detachably mounted. That is, the tool shank 31 of the tool 3 is inserted into the tool mounting portion 1a at the tip of the spindle 1, and the pull stud 32 provided at the rear end of the tool shank 31 of the tool 3 is gripped by the collet 12 provided at the tip of the draw bar 11. Then, the tool 3 is clamped to the main shaft 1 by urging the draw bar 11 in the clamping direction (back of the main shaft) by the clamp spring 13. In this embodiment, the pull stud 32 is gripped and pulled by the collet type pulling mechanism, but may be of another type such as a ball type pulling mechanism.

The spindle 1 is rotatably supported by a spindle head 2. The spindle 1 is driven to rotate by a built-in spindle motor (not shown). It should be noted that the spindle motor is not of a built-in type, but may be one that drives the spindle via a gear transmission mechanism or the like. Rear part of spindle head 2 (tool mounting part 1 of spindle 1)
On the side opposite to (a), a cylinder 21 for releasing the clamp is provided. A predetermined hydraulic pressure oil is supplied into the clamp release cylinder 21 via a joint 23 so that the reciprocating member 22 can be linearly driven.

The cylinder body 21a of the crumb release cylinder 21 is fixed to the spindle head 2 with bolts 21b, and a piston 83 is inserted into the cylinder body 21a. A reciprocating member 22 is attached to a front end of the piston 83 with a bolt 22a. A cylinder cover 89 is attached to the cylinder body 21a with bolts 89a. A cylinder chamber 88 is formed between the cylinder body 21a, the piston 83, and the cylinder cover 89. The joint 23 is connected to the cylinder cover 89 so that pressure oil can be supplied to the cylinder chamber 88.

A support member 81 is attached to the rear end of the cylinder body 21a with bolts 81a, 81a. A rod member 82 is fixed to the support member 81. A spring receiving member 90 is fixed to the rear end of the piston 83. A spring 84 is provided between the rod member 82 and the spring receiving member 90. That is, when the pressure oil is not supplied to the cylinder chamber 88, the spring 84
Reciprocating member 22, piston 83 and spring receiving member 90
Is urged away from the draw bar 11, and the end of the piston 83 is in contact with the cylinder cover 89. When the pressure oil is supplied to the cylinder chamber 88, the reciprocating member 22, the piston 83, and the spring receiving member 90
4 moves to the draw bar 11 side against the urging force of 4 and presses the draw bar 11.

A detection member 87 is attached to the spring receiving member 90, and the detection member 8 is attached to the cylinder cover 89.
5, 86 are attached. These detection members 85, 8
By 6, it is detected whether the piston 83 and the reciprocating member 22 are located at the crumb state position or the crumb release state position. Detection members 85, 8
Examples of the switch 6 include a limit switch that performs a switch function by mechanical opening and closing, a microswitch, a magnetic sensor (proximity switch, electrostatic sensor, etc.) using magnetism, a photoelectric sensor using optics, and the like.

When the reciprocating member 22 presses the rear end of the draw bar 11 and moves the draw bar 11 forward against the urging force of the clamp spring 13, the collet 12 also moves forward to grip the pull stud 32. Release, and the clamp of the tool 3 is released. In addition, a cam mechanism and a spring 8 described later are used.
4 relieves the hydraulic oil in the cylinder 21 for clamping release via the joint 23, the reciprocating member 22 moves rearward, and the tool 3
Is re-clamped by the urging force.

FIG. 2 is a view showing a configuration of a cam mechanism for operating a tool changing arm (not shown) and a cylinder 21 for releasing the clamp. The cam 4 has a cam profile (cam groove) of a drum-shaped peripheral surface and cam profiles (cam grooves) of both side surfaces (end surfaces), and is fixed to a cam shaft 44. The cam 4 and the camshaft 44 are rotationally driven by a camshaft drive motor (not shown) via a gear transmission mechanism 48. The turning shaft 49 of the tool changing arm makes a 180-degree turning motion by the cam groove 42 on the peripheral surface of the cam 4, and makes a reciprocating motion in the axial direction by the cam groove 43 on the side surface of the cam 4 and the axial driving arm 46. . Axial drive arm 46
Are swingably supported by a swing support shaft 461. A cam mechanism for rotating the tool changing arm by 180 degrees is known as described in Japanese Patent Publication No. 5-37784, and a detailed description thereof will be omitted.

A hydraulic pump 5 is disposed near the cam 4. The hydraulic pump 5 includes a piston 51 and a cylinder 52. The piston 51 is reciprocated in the cylinder 52 by a cam groove 41 on a side surface of the cam 4 and a pump drive arm 45. Pump drive arm 4
5 is swingably supported by a swing support shaft 451, and a follower 452 is held in the cam groove 41. By the rotation of the cam 4, the follower 452 of the pump drive arm 45 is driven to swing by the cam groove 41, and the pump drive arm 45
The piston 51 is driven by the driver 453 at the other end.

The piston 51 is connected to a cylinder 52 as shown in FIG.
In this state, no pressure oil is supplied to the cylinder chamber 88 of the clamp releasing cylinder 21 shown in FIG. 1, so that the reciprocating member 22 is positioned at the rear end by the urging force of the spring 84, and the tool 3 is It is in a state of being clamped to. When the piston 51 rises, the hydraulic oil in the cylinder 52 passes through the pipe 53 and is supplied into the clamp releasing cylinder 21 via the joint 23 in FIG.

When the piston 51 reaches a position above the cylinder 52 as indicated by a two-dot chain line in FIG. 2, the tool 3 is released from the main spindle 1 by supplying pressure oil to the cylinder chamber 88 of the clamping release cylinder 21. It will be in the state that was done. When the pump drive arm 45 swings and the piston 51 is moved below the cylinder 52 as shown by the solid line in FIG. 2, the movement of the piston 51 and the urging of the spring 84 cause the inside of the clamp release cylinder 21 to move. Is returned to the cylinder 52, and the tool 3 is clamped to the main shaft 1.

As shown in FIG. 3, angle indicators 61 to 63 for detecting the rotational angle position of the cam 4 are fixed to the cam shaft 44 to which the cam 4 is fixed. Angle indicator 6
Notched concave portions 61a to 61-
63a are provided, and the notched concave portions 61a to 63a are provided.
Is detected by the angle detectors 71 to 73,
The rotation angle position of the cam 4 can be determined. As the angle detectors 71 to 73, it is preferable to use photoelectric sensors which are optical detectors, but use mechanical limit switches, micro switches, magnetic detectors using magnetism (such as proximity switches), and the like. You can also.

FIG. 4 is a view showing the arrangement of the cutout recesses 61a to 63a of the angle indicators 61 to 63. Angle indicator 61
Numerals 63 to 63 are actually disks having the same radius. However, in FIG. 4, the radiuses of the notches 61a to 63a are different from each other for comparison of the angular positions. Cutout recess 61a of the angle indicator 61 is provided at a position of an angle alpha ₅ to 360 degrees (0 degrees), is used to confirm the original stop position of the cam 4. The position at an angle α _{5 to} 360 degrees is a position where the tool changing arm stops operating and the tool 3 is clamped on the main shaft 1.

The cutout recess 62a of the angle indicator 62 is provided at a position between angles α _{2 and} α ₃ . This angle α ₂ , α
₃ and θ ₁ and θ ₂ of the cam curve described later, α ₂ ≦ θ ₁ <
It is provided so that θ ₂ ≦ α ₃ . That is, this angular position is a position where the clamp between the tool 3 and the spindle 1 is released, and is used for confirming the release of the clamp.
The notch concave portion 63a of the angle indicator 63 has an angle α _{4 to} α ₁
(Alpha _1, for example 15 to 25 degrees) are provided in positions. The edge of the angle α ₄ (= α ₅ −α ₁ ) indicates the generation timing of the stop command during the forward rotation (counterclockwise).
Angle alpha ₁ of the edge shows a generation timing of the stop command when reverse rotation (clockwise).

FIG. 5 is a diagram showing a cam curve which is a motion curve given to the working end by the cam grooves 41 to 43 of the cam 4. As shown in FIG. 5A to 5C, the horizontal axis represents the rotation angle position of the cam. FIG. 5A shows a cam curve for moving the turning shaft 49 forward and backward by the cam groove 43. The vertical axis represents the linear movement (lift) of the tool changing arm in the axial direction of the turning shaft 49. I have. Lift 0mm indicates the position obtained by extracting the tool 3 from the spindle 1, the lift L ₁ is the tool 3
Indicates the position where the main shaft 1 is inserted. Tool change arm is at the angular position theta ₂ through? ₄ moves the lift L ₁ ~0mm, in angular position theta ₅ through? ₇ moves the lift 0mm~L _1.

FIG. 5 (b) shows a cam curve for turning the turning shaft 49 by the cam groove 42, and the vertical axis represents a 180-degree turning motion of the tool changing arm. The 0 degrees and 180 degrees on the vertical axis represent the reversal positions of the tool change arm that has performed the tool change with each other. Angle position θ ₃
Pivoting movement of 180 degrees of the tool change arm is performed in the range of through? _6.

FIG. 5 (c) shows a cam curve for reciprocating the reciprocating member 22 of the clamp releasing cylinder 21 via the hydraulic pump 5 by the cam groove 41, and the vertical axis indicates the clamp releasing. Reciprocating member 2 of cylinder 21
2 represents the amount of movement. Movement amount 0mm shows the unclamped state of the tool 3, the movement amount L ₂ represents a clamped condition of the tool 3. Portion for switching the clamping state and the unclamping state of the cam curve is provided in a position of angular positions 0 degree through? ₁ and theta ₈ through? _9. That is, FIG.
In the cam curves of (a) and (b), it is provided in a range where the tool change arm does not operate. Angle position θ ₉ (= α
₅ ) The original stop position is from 360 to 360 degrees (0 degrees). At this position, the tool change arm stops operating, and the tool 3 is clamped on the spindle 1.

[0028] These cam curve, a case of using the induction motor by inverter control as a cam shaft driving motor, the angular position theta ₁ of unclamping completion of the cam curve of (c), the cam of the (a) Angle position θ _{2 for} starting the lift of the curve
Are provided as preliminary sections for absorbing control errors. Section angular position theta ₇ from theta ₈ is similar. That is, the relationship is θ ₁ <θ ₂ and θ ₇ <θ ₈ . The original stop position also has a range of angular positions θ _{9 to} 360 degrees. Using an induction motor as the camshaft drive motor reduces the cost of the control and drive.

The control of the tool changing arm by the cam curve of FIG. 5 and the angle indicators 61 to 63 of FIG. 4 will be described. The original stop position is determined by detecting the notch 61a of the angle indicator 61, and the angular position θ ₉ (= α ₅ ) to 360 degrees (0 degree).
Stopped in the range. The tool 3 is in a state of being clamped to the main shaft 1. In the automatic tool change operation, the camshaft 44 is rotationally driven at a constant angular speed by a control device (not shown) and a camshaft drive motor. Unclamping in angular position theta ₁ shown in FIG. 5 (c) is completed. Decreases from the angular position theta ₂ of the tool changing arm of the lift starts (the tool 3 moving operation to disengage from the spindle 1), further a position where the tool 3 does not interfere with the spindle 1, the angular position theta ₃ tool change from the arm (The operation of exchanging the positions of one gripper and the other gripper of the twin-arm type tool change arm) is started.

At the angle position θ ₄ , the lift of the tool change arm becomes the minimum value, and the increase of the lift of the tool change arm (movement operation for inserting the tool 3 into the main shaft 1) starts from the angle position θ ₅ . Complete pivoting movement of the tool change arm in an angular position theta _6, further lift becomes a maximum value at the angular position theta _7, inserted into the main shaft 1 by replacing the tool is completed. To start the clamp of the tool was replaced from the angular position θ _8. At the angular position α ₄ , the angle detector 73 detects the notch 63 a of the angle indicator 63.
By detecting the angular position alpha ₄ of the edge, the control device generates a stop signal to the cam shaft driving motor. By the stop signal, the cam 4 stops at the original stop position at the angular position θ _{9 to} 360 degrees. It is confirmed that the vehicle has stopped at the original stop position by detecting that the angle detector 71 is inside the notch 61a. This ends the automatic tool change operation.

When manually releasing the clamp, a manual clamp release button provided on an operation panel or the like of the NC device is pressed.
Accordingly, the control device drives the camshaft drive motor to start rotating the camshaft 44 in the forward direction (counterclockwise direction in FIG. 4). When the angle detector 72 detects the edge of the angular position α ₂ (for example, θ ₁ -5 degrees) of the notch concave portion 62a of the angle indicator 62, the control device generates a stop signal to the camshaft drive motor, Clamp release position (θ _{1 to} θ ₂
During this period, the camshaft 44 is stopped. The fact that the angle detector 72 is stopped at the clamp release position indicates that the notch
This is confirmed by detecting that it is within 2a.

After manually exchanging the tool 3 of the spindle 1 and inspecting the tool 3 by hand, to manually clamp the tool 3 to the spindle 1 again, a manual clamp button provided on an operation panel or the like of the NC unit is required. push. Accordingly, the control device drives the camshaft drive motor to start rotating the camshaft 44 in the reverse direction (clockwise direction in FIG. 4). Notch recess 6 of angle indicator 63
By the angular position alpha ₁ of the edge 3a the angle detector 73 is detected, the control device generates a stop signal to the cam shaft driving motor, cam clamp position (between 0 degrees through? ₉₎ shaft 44 To stop. The stop at the clamp position (original stop position) is confirmed by detecting that the angle detector 71 is inside the notch 61a.

Since the portion for releasing and clamping the cam curve of the cam 4 is provided at the portion where the operation of the tool change arm is stopped, the clamp release of the tool 3 with respect to the main shaft 1 is manually performed as described above. The tool change arm remains stopped even after performing the clamping. Therefore, the clamp can be manually released and clamped safely without causing unnecessary movement of the tool changing arm.

Further, since the cam mechanism for manually releasing the clamp and performing the clamp is common to the cam mechanism for performing the release and the clamp in the automatic tool change operation, no extra configuration for manual operation is required. In addition, the cost of the machine tool can be reduced. Furthermore, since the mechanism for manually performing the clamp / unclamp operation is common to the highly reliable clamp / clamp release mechanism in the automatic tool change operation, the reliability of the manual clamp / clamp release operation is improved.

[0035] Here, although to perform using the angular position of 0 degrees portion through? ₁ of the cam curve shown in FIG. 5 (c) a clamp unclamping operation, part of the angular position theta ₈ through? ₉ Can also be used. In that case, the notch concave portion 62a in FIG. 4 may be provided in the range from the angular position (α ₅ −α ₃ ) to the angular position (α ₅ −α ₂ ).

FIG. 6 is a diagram showing another example of a cam curve, which is a motion curve given to the working end by the cam grooves 41 to 43 of the cam 4. As shown in FIG. 6A to 6C correspond to FIGS. 5A to 5C, respectively. (A)
The horizontal axis of (c) represents the rotation angle position of the cam. (A) shows a cam curve for moving the turning shaft 49 forward and backward by the cam groove 43, and the vertical axis represents the lift of the tool changing arm in the turning axis direction. (B) shows a cam curve for turning the turning shaft 49 by the cam groove 42, and the vertical axis shows the turning motion of the tool changing arm by 180 degrees. (C) shows the reciprocating member 2 of the cylinder 21 for releasing the clamp via the hydraulic pump 5 by the cam groove 41.
2 shows a cam curve for reciprocating 2, and the vertical axis represents the amount of movement of the reciprocating member 22 of the cylinder 21 for releasing the clamp.

Each of the cam curves in FIGS. 6A to 6C shows the case where a servomotor is used as a camshaft drive motor. In this case, a control error due to the characteristics of the camshaft drive motor is hardly considered. There is no special section for absorbing the control error. That is, (c)
The angular position theta ₁₁ of the clamp releasing completion of the cam curve of
The (a) cam curve coincides with the lift start angular position θ ₁₁ . Further, the angular position θ _{16 at the} start of the clamp of the cam curve in FIG. 9C and the angular position θ _{16 at the} end of the lift of the cam curve in FIG. Further, in FIG. 5, the original stop position in the clamped state is the angular position θ _{9 to} 360 degrees (0 degree).
In FIG. 6, the angular position is 0 degree (360 degrees).
Degree) only points.

When a servo motor is used as the cam shaft drive motor and a cam curve as shown in FIG. 6 is used,
Since the rotation angle of the cam can be determined by the drive control circuit, the angle indicators 61 to 63 and the angle detectors 71 to 73 in FIGS. 3 and 4 become unnecessary. In the cam curve of FIG. 6 as well, a portion for releasing and clamping the cam curve of the cam 4 is provided in a portion where the operation of the tool changing arm is stopped, so that the tool 3 is manually clamped to the main shaft 1. The tool change arm remains stopped even after releasing and clamping. A motor using a servomotor as a camshaft drive motor can perform precise control and can simplify a control program and the like. Further, the motor may be driven by another control motor such as a stepping motor instead of the servo motor.

In the above embodiment, the cam 4 having a drum-shaped peripheral surface and cam grooves on both side surfaces is used, but any other type of cam can be used.
Not only a cam driven by rotation but also a cam driven by a straight line may be used. Although hydraulic fluid is used as the fluid for driving the clamp release cylinder 21, any other fluid may be used.

[0040]

Since the present invention is configured as described above, it has the following effects.

Since a portion for releasing and clamping the cam curve of the cam is provided in a portion where the operation of the tool changing arm is stopped, even if the tool is manually released and clamped on the main shaft of the tool, The tool change arm remains stationary, allowing safe manual unlocking and clamping without causing unnecessary movement of the tool change arm.

Further, the cam mechanism for manually releasing the clamp and performing the clamp is common to the cam mechanism for performing the release and the clamp in the automatic tool changing operation, so that an extra configuration for manual operation is not required. In addition, the cost of the machine tool can be reduced. Furthermore, since the mechanism for manually performing the clamp / unclamp operation is common to the highly reliable clamp / clamp release mechanism in the automatic tool change operation, the reliability of the manual clamp / clamp release operation is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main shaft of a machine tool to which a tool clamping / unclamping device of the present invention is applied.

FIG. 2 is a diagram showing a configuration of a cam mechanism for operating a tool change arm and a clamp releasing cylinder.

FIG. 3 is a diagram illustrating an arrangement of a cam, a cam shaft, and an angle indicator;

FIG. 4 is a diagram illustrating an arrangement of cutout recesses of the angle indicator;

FIG. 5 is a diagram showing a cam curve of a cam groove.

FIG. 6 is a diagram showing another example of a cam curve of a cam groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Spindle 2 ... Spindle head 3 ... Tool 4 ... Cam 5 ... Hydraulic pump 11 ... Drawbar 21 ... Cylinder for releasing clamp 31 ... Tool shank 32 ... Pull stud 41-43 ... Cam groove 44 ... Cam shaft 48 ... Cam shaft drive motor 49 ... Revolving shaft 51 ... Piston 52 ... Cylinder 61-63 ... Angle indicator 61a-63a ... Notch recess 71-73 ... Angle detector

Claims (5)

[Claims] 1. A turning movement of a tool changing arm of an automatic tool changing device around a turning axis (49), a linear movement of the tool changing arm in an axial direction of the turning axis (49), and a movement to a main shaft (1). A cam mechanism having a cam (4) having a cam curve for continuously performing a clamp releasing operation and a clamping operation of the tool (3) at a predetermined timing and in a predetermined order; and a cam mechanism driving means for driving the cam mechanism. (48) controlling the cam mechanism driving means (48) to stop the cam mechanism at the clamp position and the unclamping position of the tool (3), and to move the cam mechanism to the clamp position of the tool (3); And a control means for movably controlling between the clamp position and the clamp release position. 2. A tool clamping / unclamping device for a spindle of a machine tool according to claim 1, wherein said tool is provided on said spindle (1) and mounted on a tool mounting portion of said spindle (1). A biasing means for clamping (13) for clamping 3); a fluid pressurizing means (5) provided near the cam mechanism for pressurizing fluid by operation of the cam mechanism; and the main shaft (1). Is provided on a spindle head (2) for supporting the tool, and is driven by a pressurized fluid from the fluid pressurizing means (5) to release a clamp of a tool (3) mounted on a tool mounting portion of the spindle (1). Clamp release cylinder (2
1) and a tool clamp / clamp release device for a spindle of a machine tool, comprising: a fluid passage (53) connecting between the fluid pressurizing means (5) and the clamp release cylinder (21). 3. A tool clamping and unclamping device for a spindle of a machine tool according to claim 1, wherein said cam (4) is adapted to perform said unclamping operation of a tool (3). A tool clamp / clamp release device for a main spindle of a machine tool, wherein a portion for controlling the clamp operation is provided in a region where the tool exchange arm does not operate. 4. A tool clamping / unclamping device for a spindle of a machine tool according to claim 1, wherein said control means rotates together with said cam (4) and said cam (4). 4) An angle indicator (61-63) having uneven portions (61a-63a) indicating the rotation angle position, and the uneven portions (61a-61) of the angle indicator (61-63).
63a) to detect the rotation angle position of the cam (4), and an angle detecting means (71-73); and an output of the angle detecting means (71-73), the cam mechanism driving means (48). And a drive control means for controlling the operation of the tool. 5. A tool clamping / unclamping device for a spindle of a machine tool according to claim 1, wherein said cam mechanism driving means (48) rotates said cam (4). A tool clamp / clamp release device for the main spindle of a machine tool that uses a control motor capable of controlling the angular position.