JP6746650B2 - Machine Tools - Google Patents

Description

The present invention relates to a machine tool that has a holding portion that holds a tool and that is configured such that the tool can be manually attached to and detached from the holding portion.

For example, a machine tool such as a machining center holds a tool on a main spindle, and while the main spindle is rotated by a main spindle motor, the main spindle and an appropriate table on which a work is attached are relatively moved in a three-dimensional space. By doing so, the work is processed.

Then, the spindle is provided with a holding mechanism for holding the tool in the holding hole of the spindle, and this holding mechanism is controlled by an appropriate control device such as a numerical controller, and the holding operation for holding the tool and the holding operation are performed. Perform a release operation to release the tool.

Further, in such a machine tool, generally, the tool can be manually attached to and detached from the spindle. For example, an operation button for performing the attachment/detachment operation is installed in the vicinity of the attachment/detachment position set as the position for manually attaching/detaching the tool, and the operator operates the operation button to respond to the operation from the operation button. A signal is transmitted to the control device, the holding mechanism is driven under the control of the control device, and the attachment/detachment of the tool to/from the spindle is executed.

Specifically, after the operator moves the spindle to the attachment/detachment position and operates the operation button for removal while holding the tool, a removal signal is transmitted from the operation button to the control device. The holding mechanism performs the releasing operation under the control of the control device. As a result, the tool held by the spindle is released, and the operator removes the released tool from the spindle.

On the other hand, in the case of attaching the tool to the spindle, similarly, after the operator moves the spindle to the attachment/detachment position, by operating the attachment operation button with the tool inserted into the holding hole of the spindle, the operation is performed. A mounting signal is transmitted from the button to the control device, and the holding mechanism performs a holding operation under the control of the control device, whereby the tool is mounted in the holding hole of the spindle.

By the way, as tools used for machine tools, there are relatively lightweight tools such as drills and end mills, and relatively heavy tools such as face mills and boring bars. Then, in the case of manually removing such a heavy tool from the spindle, when the releasing operation by the holding mechanism is performed immediately after the operator operates the operation button for removal, the operator is in a sufficient posture for receiving the tool. The tool may be released before trimming, which causes a problem that the operator fails to receive the tool and the tool falls. Particularly in the case of a vertical machine tool, the operator easily drops the tool.

Further, conventionally, there is a machine tool configured to form a through hole opening at the tip of the tool in the tool and discharge the coolant from the opening through the through hole, but in the case of this machine tool, Usually, a spring body is mounted in the holding hole of the main shaft in order to bring the rear end portion of the tool into close contact with the coolant supply portion. Therefore, when the holding mechanism performs the releasing operation to release the tool, a phenomenon occurs in which the tool pops out of the spindle due to the biasing force of the spring body. Due to such popping-out phenomenon, the tool is relatively lightweight. However, a situation may occur in which the operator fails to receive the tool and the tool falls.

On the contrary, when the tool is attached to the spindle, if the tool is heavy, the operator may operate the attachment operation button without inserting the tool into the holding hole of the spindle. In such a case, it may happen that the tool cannot be accurately mounted on the spindle. Particularly, in the case of a vertical machine tool, such a problem is likely to occur.

Therefore, in order to deal with such a problem, an electric discharge machine (machine tool) as disclosed in Patent Document 1 below has been conventionally proposed. In other words, this electric discharge machine has a timer for measuring the elapse of the time set by the user as the preparation period for supporting the object to be grasped after detecting the operation of performing the clamp (holding) or the unclamping (release). And a clamper control unit that causes the clamp device to execute an operation corresponding to the detected operation when the timer times out.

According to this electric discharge machine, the operator can hold the grasped object with both hands while the timer counts down even if the grasped object is heavy and the operator cannot support it with one hand. Therefore, it is possible to prevent the unclamped object to be dropped from the clamp device or to prevent the object to be clamped by the clamp device in an incomplete state.

Japanese Patent No. 5128013

However, conventionally, even in the machine tool provided with the timer and the clamper control unit disclosed in the above-mentioned Patent Document 1, there is a problem that the operator cannot perform this in a sufficient posture when the tool is attached to or detached from the spindle. , Still unsolved.

That is, by allowing the operator to perform the attaching/detaching operation corresponding to the manual operation after the time set by the timer elapses after the operator performs the manual operation, the operator has a time margin to cope with the attaching/detaching operation. However, since the operator can only perceptually know exactly when the attaching/detaching operation is executed, it is not always possible to cope with the attaching/detaching operation with a sufficient posture.

For example, when removing a tool from the spindle, if the operator has a sufficient grace period after operating the operation button, the operator can hold the tool to be removed sufficiently, but the release time is unknown. On the other hand, the operator cannot maintain the prepared posture with tension. As a result, the operator suddenly releases the tool, and as a result, the operator cannot properly respond to the tool releasing operation, and sudden load is applied, which disturbs the posture and the tool. Will be dropped. This also applies when the tool is attached to the spindle.

The present invention has been made in view of the above circumstances, and when the tool is attached/detached to/from the spindle by manual operation, the operator objectively predicts or recognizes the time point at which the attachment/detachment operation is executed by the operation. The purpose is to provide machine tools that can

The present invention for solving the above problems,
A spindle as a holding part for holding tools,
A holding mechanism that performs a holding operation for holding the tool in the holding portion and a releasing operation for releasing the held tool,
A controller that drives the holding mechanism to execute the holding operation and the releasing operation;
And a manual operation unit for inputting an operation signal for causing the holding mechanism to execute the holding operation and the releasing operation,
The control unit, after receiving the operation signal input from the manual operation unit, transmits a drive signal corresponding to the received operation signal to the holding mechanism after the elapse of a predetermined grace period, and the operation signal is transmitted. In a machine tool configured to perform an operation corresponding to
An energy output device that outputs energy that can be sensed by a person to an external space is provided, the remaining time of the grace period is recognized based on the information received from the control unit, and information according to the recognized remaining time is In addition to providing a grace state notification unit that notifies by changing the output state of the energy output from the energy output device,
Said energy output device, Ri flight der of the machine tool, and the operator of the tool during operation of detachable from the holder, can recognize the change in the output state of the energy output from the energy output device The present invention relates to a machine tool arranged at a spindle head that rotatably holds the spindle at various positions.

According to this machine tool, when the operator manually operates the manual operation part in order to attach/detach the tool to/from the spindle that is the holding part , the corresponding operation signal is transmitted from the manual operation part to the control part. Then, the control unit, after receiving the operation signal input from the manual operation unit, transmits a drive signal corresponding to the received operation signal to the holding mechanism after the elapse of a predetermined grace time, and outputs the operation signal to the operation signal. Perform the corresponding action.

On the other hand, the grace status notification unit recognizes the remaining time of the grace time based on the information received from the control unit, and outputs information according to the recognized remaining time from the energy output device provided on the spindle head. This is notified by changing the output state of. Thus, the operator can objectively predict or recognize the remaining time until the operation is performed by the holding mechanism, based on the change in the output state of the energy output from the energy output device, and the detaching operation The posture can be adjusted according to. Therefore, when the operator removes the tool from the holding portion, the tool removed from the holding portion can be reliably held, and when the tool is attached to the holding portion, the tool is attached to the holding portion. Can be attached with high accuracy.

The grace status notification unit can recognize the remaining time by directly receiving information about the remaining time of the grace time from the control unit, or holds the information about the grace time set by the control unit, When an operation signal is input from the manual operation unit, the operation signal is received via the control unit and the remaining time of the grace time is calculated, whereby the remaining time can be recognized.

In the present invention, the grace state notification unit includes a lamp that emits light as the energy output device, and is configured to notify information according to the remaining time by blinking the lamp that emits light. The mode in which the blinking interval of the lamp is shortened as the remaining time becomes shorter can be adopted. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation by recognizing the blinking interval of the lamp.

Further, in the present invention, the grace state notification unit includes a lamp that emits light as the energy output device, and notifies information according to the remaining time of the grace time by the intensity of light emitted from the lamp. It is possible to adopt a mode in which the intensity of the emitted light is reduced or increased as the remaining time becomes shorter. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation by recognizing the intensity of the lamp to be lit.

In each of the above aspects, a lamp that illuminates the inside of the machining area of the machine tool can be applied to the lamp as the energy output device.

Further, in the present invention, the grace state notification unit includes a plurality of lamps that emit light as the energy output device, and according to the remaining time of the grace time, by lighting a preset lamp, the It is possible to adopt a mode configured to notify information according to the remaining time of the grace time. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism executes the operation by checking the lamp that is turned on. The plurality of lamps may be arranged in a line and the lamps may be sequentially turned on according to the remaining time. Alternatively, it is possible to adopt a mode in which a plurality of lamps are made to emit different colors of light and the lamps of the colors according to the remaining time are turned on.

Further, in the present invention, the grace status notification unit includes a speaker that outputs a sound as the energy output device, and is configured to notify information according to the remaining time of the grace time by a sound output from the speaker. Different modes can be adopted. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation, by the sound output from the speaker.

Further, in the present invention, the grace status notification unit is configured to intermittently output a sound from the speaker and to shorten the interval of the output sound as the remaining time of the grace time becomes shorter. Can be taken. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation, by recognizing the interval of the sound intermittently output from the speaker.

Further, in the present invention, the grace status notification unit may be configured to output a voice from the speaker, and may be configured to notify the remaining time of the grace time by a voice countdown. In such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation by recognizing the count output by the voice from the speaker.

Further, in the machine tool of each aspect described above, the manual operation unit is configured to input a cancel signal for canceling the most recently input operation signal to the control unit,
When a cancel signal is input from the manual operation unit before the grace period has elapsed, the control unit transmits a drive signal corresponding to the operation signal input before the cancel signal to the holding mechanism. It is preferably configured to discontinue.

As described above, in the machine tool of each of the above aspects, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation, but on the operator side, the holding mechanism performs the operation. By the time, for some reason, it may not be possible to fully prepare the posture for manual operation. In this case, when the operation of the holding mechanism is performed according to the manual operation, eventually, a situation in which it is not possible to accurately attach the tool to the holding portion or securely hold the tool removed from the holding portion occurs. obtain. Therefore, when the operator cannot adjust the posture sufficiently, the cancel signal is input from the manual operation unit before the grace period elapses, and the operation signal input before the cancel signal is canceled. As a result, it is possible to prevent the above problems from occurring.

According to the present invention, the operator on the basis of the change in the output state of the energy output from the Enel ghee output device, objectively predict the remaining time until the operation is performed by the holding mechanism, or to recognize Therefore, the posture can be adjusted according to the attaching/detaching operation. Therefore, when the operator removes the tool from the holding portion, the tool removed from the holding portion can be reliably held, and when the tool is attached to the holding portion, the tool is attached to the holding portion. Can be attached with high accuracy.

It is the perspective view which showed the machine tool which concerns on one Embodiment of this invention. It is explanatory drawing which showed the schematic structure of the machine tool which concerns on this embodiment. It is the front view which showed the energy output apparatus which concerns on the other aspect of this invention. It is the front view which showed the energy output apparatus which concerns on the other aspect of this invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the machine tool 1 of the present example is a vertical machining center. The bed 2 shown in FIG. 1, the column 3 standing on the bed 2, and the bed 2 moved in the Y-axis direction. A saddle 4 provided so as to be movable, a table 5 provided on the saddle 4 so as to be movable in the X-axis direction, and a spindle head 6 supported by the column 3 so as to be movable in the Z-axis direction, as shown in FIG. A manual operation unit 18, a numerical control device 20, a grace state notification unit 21, and the like are provided. The X axis, the Y axis, and the Z axis are movement axes orthogonal to each other, and the Z axis is a vertical axis.

As shown in FIG. 2, a spindle 7 is held on the spindle head 6 so as to be rotatable around a vertical axis. A taper-shaped mounting hole (holding hole) 8 that opens to the end face is formed at the center front end (lower end) of the main shaft 7, and the main shaft 7 functions as a holding part that holds the tool T. The tool T is mounted in the mounting hole 8.

Further, a through hole 9 communicating with the mounting hole 8 is formed at the center of the main shaft 7, and a tubular outer cylinder inserted into the through hole 9 so that a lower end portion thereof faces the mounting hole 8. A member 12, a collet 11 inserted into the lower end of the outer tubular member 12, a draw bar 13 inserted into the outer tubular member 12 so that the lower end engages with the collet 11, and a member provided to be fitted onto the draw bar 13. The disc spring 14 and the like are provided.

The collet 11, the outer cylinder member 12, the draw bar 13, and the disc spring 14 constitute a part of the holding mechanism 10. In addition to the holding mechanism 10, the hydraulic cylinder 15 and the hydraulic cylinder 15 connected to the draw bar 13 are also provided. A pressure oil supply source 16 for supplying pressure oil to and a switching valve 17 for switching between supply and stop of pressure oil from the pressure oil supply source 16 to the hydraulic cylinder 15 are provided.

The disc spring 14 urges the draw bar 13 to be pulled backward (upward), and when the supply of the pressure oil to the hydraulic cylinder 15 is stopped by the switching action of the switching valve 17, the disc spring 14 is attached. The draw bar 13 is pulled up by the urging force, and thus the collet 11 is pulled up together with the draw bar 13 and the collet 11 is closed. The above operation is the holding operation of the holding mechanism 10.

On the other hand, when pressure oil is supplied to the hydraulic cylinder 15 by the switching action of the switching valve 17, the hydraulic cylinder 15 moves the draw bar 13 forward (downward) against the biasing force of the disc spring 14. As a result, the collet 11 moves downward together with the draw bar 13 and the collet 11 is opened. The above operation is the releasing operation of the holding mechanism 10.

Thus, in the state where the holding mechanism 10 performs the releasing operation, that is, the pressure oil is supplied to the hydraulic cylinder 15, the draw bar 13 and the collet 11 move downward, and the collet 11 is opened. When the tool T is inserted into the mounting hole 8 of the spindle 7, the pull stud Ta is inserted into the collet 11.

Then, the holding mechanism 10 is caused to perform a holding operation, that is, the switching valve 17 is switched to stop the supply of pressure oil to the hydraulic cylinder 15, and the draw bar 13 and the collet 11 are moved upward by the urging force of the disc spring 14. Then, the collet 11 is closed, the pull stud Ta of the tool T is gripped by the collet 11, and the tool T is pulled into the mounting hole 8. As a result, the tool T is attached to the spindle 7.

On the other hand, the holding mechanism 10 is caused to execute the release operation, that is, the switching valve 17 is switched to supply the pressure oil to the hydraulic cylinder 15, and the draw bar 13 and the collet 11 are moved downward against the biasing force of the disc spring 14. Then, the collet 11 is opened, whereby the tool T is released from the grip by the collet 11, and the tool T can be pulled out from the mounting hole 8.

The holding operation and the releasing operation of the holding mechanism 10 are controlled by the manual operation unit 18 and the numerical controller 20. The manual operation unit 18 is a device that inputs an operation signal for causing the holding mechanism 10 to perform a holding operation and a releasing operation, and a signal (cancel signal) for canceling the input operation signal. In the present example, It is provided with an attachment button for performing a holding operation, a removal button for performing a releasing operation, and a cancel button for canceling. The manual operation unit 18 is arranged at a position where the operator can operate the tool T when attaching or detaching the tool T to/from the spindle 7.

The numerical control device 20 is a control device that controls a feeding device (not shown) and a spindle motor (not shown) of the machine tool 1, and when an operation signal is received from the manual operation unit 18, the operation signal is output. While transmitting a signal (reception signal) indicating reception to the notification control unit 23 described later, counting the elapsed time from the time of receiving the operation signal, after the elapsed time reaches a preset grace time, That is, after a preset grace period has elapsed, a drive signal corresponding to the received operation signal is transmitted to the switching valve 17 of the holding mechanism 10 to operate the switching valve 17.

Specifically, when a hold (operation) signal (attachment signal) is input from the manual operation unit 18, the numerical control device 20 transmits a stop signal (drive signal) to the switching valve 17 after the grace period has elapsed. Then, the supply of the pressure oil to the hydraulic cylinder 15 is stopped. On the other hand, when the release (operation) signal (removal signal) is input from the manual operation unit 18, the numerical control device 20 transmits a supply signal (drive signal) to the switching valve 17 after the grace period has elapsed. , To supply pressure oil to the hydraulic cylinder 15.

Further, the numerical control device 20 receives the operation signal (attachment signal or removal signal) from the manual operation unit 18, before the grace period elapses, and further when the cancel signal is received from the manual operation unit 18, the reception signal is received before that. The transmission of the drive signal corresponding to the operation signal to the switching valve 17 is stopped.

The grace state notification unit 21 indicates a lamp 22 provided near the lower end of the spindle head 6 and a lighting state of the lamp 22 so that the operator can visually recognize the tool T when the tool T is attached to and detached from the spindle 7. The control unit 23 controls the information.

When the notification control unit 23 receives the reception signal from the numerical control device 20, the notification control unit 23 turns on the lamp 22 so as to blink at a preset time interval. While recognizing the remaining time, the lamp 22 is made to blink so that the time interval becomes shorter as the recognized remaining time becomes shorter, and when the grace time has elapsed, the lamp 22 is turned off.

As a method of shortening the blinking time interval, a method of shortening it stepwise or a method of shortening it continuously can be adopted, but the stepwise shortening makes it easier for the operator to grasp the remaining time. As a method for the notification control unit 23 to recognize the remaining time, a mode of directly receiving information about the remaining time from the numerical control device 20 or holding information about the grace time set by the numerical control device 20, After receiving the reception signal from the numerical control device 20, the remaining time can be recognized by calculating (counting) the remaining time of the grace time.

According to the machine tool 1 of the present example having the above configuration, the operator attaches/detaches the tool T to/from the spindle 7 as follows.

That is, first, the spindle head 6 is moved to the lower position in the Z-axis direction set as the tool attachment/detachment position under the control of the numerical controller 20 via an operation panel (not shown). At this time, the tool T is attached to the spindle 7, and the operator removes the current tool T from the spindle 7 and then attaches a new tool T to the spindle 7.

Next, when the operator presses the removal button of the manual operation unit 18 while holding the tool T attached to the spindle 7 with one hand, for example, when the weight of the tool T to be removed is heavy, etc. , Take an appropriate posture such as grasping the tool T with both hands.

When the operator presses the removal button, a removal signal is transmitted from the manual operation unit 18 to the numerical control device 20, and the numerical control device 20 receives the removal signal and then transmits the reception signal to the notification control unit 23. At the same time, the elapsed time from the time of reception is counted, and when the elapsed time reaches a preset grace time, a drive signal (supply signal) corresponding to the removal signal is transmitted to the switching valve 17, Pressure oil is supplied to the hydraulic cylinder 15. As a result, the draw bar 13 and the collet 11 move downward, the collet 11 is opened, and the operator can pull out the tool T from the mounting hole 8.

On the other hand, the notification control unit 23, after receiving the reception signal from the numerical control device 20, turns on the lamp 22 so as to blink at a preset time interval, and thereafter, the notification control unit 23 causes the notification time of the grace period. While recognizing the remaining time, the lamp 20 is made to blink so that the time interval becomes shorter as the recognized remaining time becomes shorter, and the lamp 22 is turned off when the grace time has elapsed. Thus, the operator can objectively predict or recognize the remaining time until the tool T is released from being held by the holding mechanism 10 by recognizing the blinking interval of the lamp 20, and from the spindle 7. When the tool T is detached, it is possible to prepare a sufficient posture for receiving the tool T. Therefore, even if the weight of the tool T is heavy, the operator can remove it with a margin.

Next, the operator presses the attachment button of the manual operation part 18 with the new tool T inserted in the attachment hole 8 of the spindle 7. When the operator presses the attachment button, an attachment signal is transmitted from the manual operation unit 18 to the numerical control device 20, and the numerical control device 20 receives the attachment signal and then transmits the reception signal to the notification control unit 23 and receives the reception signal. When the elapsed time reaches a preset grace time, the drive signal (stop signal) corresponding to the attachment signal is transmitted to the switching valve 17 to the hydraulic cylinder 15. Stop the pressure oil supply. As a result, the draw bar 13 and the collet 11 move upward, the collet 11 is closed, and the tool T is mounted in the mounting hole 8 of the spindle 7.

On the other hand, the notification control unit 23, after receiving the reception signal from the numerical control device 20, turns on the lamp 22 so as to blink at a preset time interval, and thereafter, the notification control unit 23 causes the notification time of the grace period. While recognizing the remaining time, the lamp 20 is made to blink so that the time interval becomes shorter as the recognized remaining time becomes shorter, and the lamp 22 is turned off when the grace time has elapsed. Thereby, the operator can objectively predict or recognize the remaining time until the new tool T is held by the holding mechanism 10 by recognizing the blinking interval of the lamp 20. Therefore, when the tool T is mounted in the mounting hole 8 of the spindle 7, the operator can take sufficient measures to mount the tool T in the spindle 7, such as pressing the tool T into the mounting hole 8. Even if the weight of the tool T is heavy, the tool T can be accurately mounted on the spindle 7.

As described above, when the operator attaches/detaches the tool T to/from the spindle 7, the operator can perform the attaching/detaching operation with a sufficient margin, but nevertheless, the holding mechanism 10 holds the tool T for some reason. In some cases, it may not be possible to prepare a sufficient posture before the release operation is performed. In this case, the operator presses the cancel button of the manual operation unit 18 before the grace period elapses, and the operator makes a previous input. You can cancel the operation.

Although one embodiment of the present invention has been described above, the specific mode that the present invention can adopt is not limited to this.

For example, in the above example, a machining center is illustrated as the machine tool 1, but the machine tool to which the present invention is applicable is not limited to this, and all conventionally known machine tools are included. Further, in the above example, the spindle 7 is exemplified as the tool T as the holding portion, but the present invention is not limited to this, and all holding portions that hold the tool T in the machine tool are included in the holding portion in the present invention.

Further, in the above example, the notification control unit 23 is configured to blink the lamp 22 at shorter time intervals as the remaining time of the grace time becomes shorter, but the present invention is not limited to this, and the notification control unit 23 The lamp 22 may be configured to be constantly turned on after receiving the reception signal, and the emission intensity of the lamp 22 may be decreased or increased as the remaining time becomes shorter. Also in such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism 10 performs the operation.

Further, in the above example, the lamp 22 is used to notify the information regarding the remaining time of the grace time, but the present invention is not limited to this, and the notification control unit 23 causes the machining area of the machine tool 1 to be processed. A mode in which the information regarding the remaining time is notified by controlling the lighting state (blinking or emission intensity) of a lamp provided to illuminate the inside may be used.

Further, in the above example, the one lamp 22 is used to notify the information regarding the remaining time, but the present invention is not limited to this, and instead of the lamp 22, a plurality of lamps as shown in FIG. The configuration may be such that five lamps 24 to 28 are provided on the spindle head 6 in the example. In this case, the notification control unit 23 can adopt a mode of notifying the information according to the remaining time by selectively lighting the lamps 24 to 29 set in advance according to the remaining time. For example, as the remaining time becomes shorter, a mode in which lower lamps are sequentially turned on from the uppermost lamp 24, and conversely, a mode in which uppermost lamps are sequentially turned on from the lowermost lamp 28 are exemplified. Further, in this case, the emission colors of the lamps 24 to 28 can be different from each other. Also in such a mode, the operator can objectively predict or recognize the remaining time until the holding mechanism 10 performs the operation.

Further, instead of the lamp 22 in the above example, the speaker 29 shown in FIG. 4 may be arranged in the vicinity of where the operator attaches and detaches the tool T. In this case, the notification control unit 23 is configured to notify the information according to the remaining time by the sound output from the speaker 29. For example, the sound is intermittently output from the speaker 29 to shorten the remaining time. Accordingly, it is possible to adopt a mode configured to shorten the interval between the sounds to be output. Alternatively, the notification control unit 23 may be configured to output a sound from the speaker 29 and to notify the remaining time by a sound countdown. Also according to these aspects, the operator can objectively predict or recognize the remaining time until the holding mechanism performs the operation.

Takes place, the lamp 22 may be an energy output device capable of outputting a sensible energy person outside, if Enel ghee output device capable varying the output state of the energy , notification control unit 23 may take a mode for changing the output state of energy output from Enel Guy output device in response to the remaining time.

Again, the description of the embodiments above is illustrative in all respects and not restrictive. Those skilled in the art can appropriately make modifications and changes. The scope of the invention is indicated by the claims rather than the embodiments described above. Further, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.

1 Machine Tool 6 Spindle Head 7 Spindle 8 Mounting Hole 10 Holding Mechanism 11 Collet 12 Outer Cylinder Member 13 Drawbar 14 Disc Spring 15 Hydraulic Cylinder 16 Pressure Oil Supply Source 17 Switching Valve 18 Manual Operation Section 20 Numerical Control Unit 21 Grace Inviting Section 22 Lamp 23 Notification control unit 24 to 28 Lamp 29 Speaker

Claims (8)

A spindle as a holding part for holding tools,
A holding mechanism that performs a holding operation for holding the tool in the holding portion and a releasing operation for releasing the held tool,
A controller that drives the holding mechanism to execute the holding operation and the releasing operation;
And a manual operation unit for inputting an operation signal for causing the holding mechanism to execute the holding operation and the releasing operation,
The control unit, after receiving the operation signal input from the manual operation unit, transmits a drive signal corresponding to the received operation signal to the holding mechanism after the elapse of a predetermined grace period, and the operation signal is transmitted. In a machine tool configured to perform an operation corresponding to
An energy output device that outputs energy that can be sensed by a person to an external space is provided, the remaining time of the grace period is recognized based on the information received from the control unit, and information according to the recognized remaining time is In addition to providing a grace state notification unit that notifies by changing the output state of the energy output from the energy output device,
Said energy output device, Ri flight der of the machine tool, and the operator of the tool during operation of detachable from the holder, can recognize the change in the output state of the energy output from the energy output device A machine tool, which is disposed at a spindle head that rotatably holds the spindle at various positions. The grace status notification unit includes a lamp that emits light as the energy output device, and is configured to notify the information according to the remaining time by blinking the lamp that emits light, and the remaining time. The machine tool according to claim 1, wherein the blinking interval of the lamp is shortened as the lamp length is shortened. The grace status notification unit includes a lamp that emits light as the energy output device, and is configured to notify the information according to the remaining time by the intensity of light emitted from the lamp, and the remaining time. 2. The machine tool according to claim 1, wherein the machine tool is configured so that the intensity of the emitted light becomes lower or higher as the length becomes shorter. The grace state notification unit includes a plurality of lamps that emit light as the energy output device, and notifies information according to the remaining time by lighting a preset lamp according to the remaining time. The machine tool according to claim 1, wherein the machine tool is configured as described above. The grace state notification unit includes a speaker that outputs a sound as the energy output device, and is configured to notify information according to the remaining time by a sound output from the speaker. The machine tool according to 1. 6. The grace state notification unit is configured to intermittently output a sound from the speaker and to shorten the interval of the output sound as the remaining time becomes shorter. Machine tool. The machine tool according to claim 5, wherein the grace state notification unit is configured to output a voice from the speaker and configured to notify the remaining time by a countdown by voice. The manual operation unit is configured to input a cancel signal for canceling the operation signal input most recently to the control unit,
When a cancel signal is input from the manual operation unit before the grace period has elapsed, the control unit transmits a drive signal corresponding to the operation signal input before the cancel signal to the holding mechanism. The machine tool according to any one of claims 1 to 7, wherein the machine tool is configured to be stopped.

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