阅读说明：本技术 导衬控制装置以及导衬的调整方法 (Guide bush control device and guide bush adjustment method ) 是由 小林阳介 高桥光 于 2014-03-06 设计创作，主要内容包括：本发明提供一种使设置在导衬后端的调整用螺母旋转而能够容易地进行导衬的调整作业的导衬控制装置。在用于驱动控制导衬马达(12)的控制装置(17)设有通过将导衬马达(12)在旋转停止状态下励磁而将导衬(11)以旋转不可的方式固定的固定装置,该导衬马达(12)用于旋转驱动导衬(11)。(The invention provides a guide bush control device which can rotate an adjusting nut arranged at the rear end of a guide bush to easily perform the adjustment operation of the guide bush. A control device (17) for drive-controlling a guide bush motor (12) is provided with a fixing device for fixing a guide bush (11) in a rotationally fixed manner by exciting the guide bush motor (12) in a rotation stop state, and the guide bush motor (12) is used for rotationally driving the guide bush (11).)

1. A guide bush control device is provided with: a guide bush motor (12) for rotationally driving a guide bush (11), and a control device (17) for drive-controlling the guide bush motor (12), wherein the control device (17) controls the drive of the guide bush motor (12) to control the rotation of the guide bush (11),

the guide bush control device is provided with an adjusting jig (41) which is composed of a flange (42), a notch part (43), an adjusting plug pin (44) and a bolt jig (46), wherein the adjusting jig (41) is inserted into an outer sleeve (27) and rotates the adjusting nut (32) to adjust the guide bush (11),

the control device (17) functions as a fixing device as follows: when adjusting the guide bush (11) by rotating the adjusting nut (32), the guide bush motor (12) is excited in a state where rotation is stopped so that the adjusting nut (32) can be rotationally operated in a fixed state of the guide bush (11), and the guide bush (11) is fixed in a rotationally fixed manner by a holding torque obtained by the excitation of the guide bush motor (12),

the guide bush (11) is provided in a cover (2) of a machine tool (1), the fixing device is configured to start excitation of the guide bush motor (12) when a door (3) provided in the cover (2) and capable of opening and closing is in a closed state,

the guide bush (11) is adjusted in the opened state of the door (3),

the guide bush motor (12) is excited in a state where the manual operation restricting means (59) and the rotation restricting means (61) are operated,

the manual operation limiting device (59) limits the rotation driving of the guide bush motor (12) when the manual operation device (48) is rotated,

the rotation limiting device (61) limits the number of rotations of the guide bush (11) to 0 when the control device (17) commands the rotation of the guide bush (11).

2. The bushing control device according to claim 1, wherein the manual operation device (48) generates a signal for driving the bushing motor (12) by manual operation, the manual operation limiting device (59) invalidates the signal by the manual operation device (48), and the fixing device is configured to excite the spindle motor (9) or the bushing motor (12) in an operating state of the manual operation limiting device (59).

3. The guide bush control device according to claim 2, wherein the guide bush (11) is driven by the spindle motor (9) for driving a spindle (6) of the machine tool (1), and the guide bush (11) is fixed so as to be non-rotatable by exciting the spindle motor (9).

4. The guide bush control device according to claim 3, wherein the spindle motor (9) doubles as the guide bush motor (12), and the guide bush (11) is rotationally driven integrally with the spindle (6) by the spindle motor (9).

5. A method for adjusting a guide bush, which is performed by a guide bush control device, the guide bush control device comprising: a guide bush motor (12) for rotationally driving a guide bush (11), and a control device (17) for drive-controlling the guide bush motor (12), wherein the control device (17) controls the drive of the guide bush motor (12) to control the rotation of the guide bush (11),

the guide bush control device is provided with an adjusting jig (41) which is composed of a flange (42), a notch part (43), an adjusting plug pin (44) and a bolt jig (46), wherein the adjusting jig (41) is inserted into an outer sleeve (27) and rotates the adjusting nut (32) to adjust the guide bush (11),

when adjusting the guide bush (11) by rotating the adjusting nut (32), the guide bush motor (12) is excited in a state where rotation is stopped so that the adjusting nut (32) can be rotationally operated in a fixed state of the guide bush (11), and the guide bush (11) is fixed in a rotationally fixed manner by a holding torque obtained by the excitation of the guide bush motor (12),

the guide bush (11) is provided in a cover (2) of a machine tool (1), the control device (17) starts excitation of the guide bush motor (12) when a door (3) provided in the cover (2) and being freely opened and closed is in a closed state,

the guide bush (11) is adjusted in the opened state of the door (3),

the guide bush motor (12) is excited in a state where the manual operation restricting means (59) and the rotation restricting means (61) are operated,

the manual operation limiting device (59) limits the rotation driving of the guide bush motor (12) when the manual operation device (48) is rotated,

the rotation limiting device (61) limits the number of rotations of the guide bush (11) to 0 when the control device (17) commands the rotation of the guide bush (11).

Technical Field

The present invention relates to a guide bush control device and a guide bush adjustment method.

Background

A guide bush device in which a guide bush is rotatably supported by a guide bush mounting body is widely known (see, for example, patent document 1).

The guide bush is generally rotationally driven by a guide bush motor or the like, and the guide bush motor is driven and controlled by a control device.

[ patent document ]

[ patent document 1 ] Japanese examined patent publication No. 3-5361

Disclosure of Invention

(problems to be solved by the invention)

The guide bush is inserted into the guide bush, and the rear end of the guide bush is screwed with an adjusting nut. The guide bush is moved in the axial direction relative to the guide bush by, for example, rotating the adjusting nut, and is adjusted in inner diameter by a tapered (taper) portion. However, since the guide bush is a so-called rotary guide bush and rotates integrally with the guide bush sleeve, when the adjustment nut is rotated, the adjustment nut must be rotated in a state where the rotation of the guide bush is restricted by a wrench or the like, and thus there is a disadvantage that the adjustment work of the guide bush is not easy.

(means for solving the problems)

The guide bush control device of the present invention for solving the above-mentioned problems is provided with a guide bush motor 12 for rotationally driving a guide bush 11, and a drive device 17 for drive-controlling the guide bush motor 12, and the control device 17 controls the drive of the guide bush motor 12 to control the rotation of the guide bush 11, wherein the control device 17 is provided with a fixing device for fixing the guide bush 11 so as not to be rotatable by exciting the guide bush motor 12 in a rotation stop state.

In the feature 2, the control device 17 includes a rotation limiting device 61 configured to limit the number of rotations of the guide bush 11 to 0 when instructed to rotate the guide bush 11, and the fixing device is configured to excite the guide bush motor 12 in an operating state of the rotation limiting device 61.

The 3 rd feature is that the manual operation device 48 is provided for generating a signal for driving the guide bush motor 12 by a manual operation, the control device 17 is provided with a manual operation limiting device 59 for invalidating the signal by the manual operation device 48, and the fixing device is configured to excite the guide bush motor 12 in an operating state of the manual operation limiting device 59.

In the feature 4, the guide bush 11 is disposed in the cover 2 of the machine tool 1, and the fixing device is configured to start excitation of the guide bush motor 12 when the door 3 provided in the cover 2 and being freely opened and closed is closed.

In the feature 5, the guide bush 11 is driven by a spindle motor 9 for driving the spindle 6 of the machine tool 1, and the guide bush 11 is fixed so as to be unrotatable by exciting the spindle motor 9.

In the feature 6, the guide bush motor 12 and the spindle motor 9 are provided separately, and the guide bush motor 12 is configured to be driven in synchronization with the spindle motor 9.

The feature 7 is that the spindle motor also serves as a guide bush motor, and the guide bush is integrally rotationally driven with the spindle by the spindle motor.

Further, the guide bush adjusting method of the present invention is a guide bush adjusting method which performs adjustment by a guide bush control device including a guide bush motor 12 for rotationally driving a guide bush 11 and a drive device 17 for drive-controlling the guide bush motor 12, wherein the control device 17 controls the drive of the guide bush motor 12 to control the rotation of the guide bush 11, wherein when the adjustment of the guide bush 11 is performed, the guide bush motor 12 is excited in a state where the rotation is stopped by the drive control of the control device 17, and the guide bush 11 is fixed so as not to be rotatable.

(Effect of the invention)

According to the configuration of the present invention configured as described above, since the guide bush motor is excited in a state where rotation is stopped by the fixing device, and the guide bush is fixed so as to be unrotatable, in a case where an operator performs work while restricting rotation of the guide bush, the operator does not need to restrict rotation of the guide bush using a wrench or the like as in the related art. Further, the fixing device can easily restrict the rotation of the guide bush, and can easily perform operations such as the inner diameter adjustment of the guide bush.

In particular, the guide bush motor is excited in an operating state of the rotation restricting device or the manual operation restricting device, and the following effects are obtained: even when a command for rotating the guide bush motor by a predetermined number of rotations is generated from the control device due to a malfunction or the like, since the rotation of the guide bush motor is restricted, the fixing device prevents the guide bush from rotating erroneously in a state where the guide bush is fixed so as not to be rotatable, and thus work safety such as inner diameter adjustment of the guide bush can be ensured.

Further, when the guide bush is disposed in the cover of the machine tool, the guide bush motor is configured to start excitation when the door provided in the cover and capable of opening and closing is closed, so that the excitation of the guide bush motor is started before the door is opened. Accordingly, the energization of the guide bush motor can be started before the door is opened to perform the operation such as the inner diameter adjustment of the guide bush.

In this case, when performing the operation such as the adjustment of the inner diameter of the guide bush, for example, after confirming that the guide bush is in the stopped state, the door can be opened to perform the adjustment operation. This can improve the safety of the work and prevent the guide bush from rotating erroneously and causing adverse effects.

In addition, when the spindle motor for driving the spindle and the guide bush motor are provided separately, the guide bush motor can be excited indirectly by exciting the spindle motor, in addition to the direct excitation of the guide bush motor, particularly when the spindle motor and the guide bush motor are driven in synchronization with each other.

In the case where the spindle and the guide bush are rotationally driven by 1 spindle motor, the spindle motor also serves as the guide bush motor, and the guide bush can be fixed so as not to be rotatable by exciting the spindle motor in a state where the spindle motor stops rotating.

Drawings

Fig. 1A is a front view of an automatic lathe showing a state where a door is closed.

Fig. 1B is a front view of the automatic lathe, showing a state where the door is opened.

Fig. 2 is a sectional view of a main part of the guide bush device.

Fig. 3 is a main block diagram of a part of the control apparatus.

Fig. 4 is a sectional view of a main part of the guide bush device in a state where the adjustment jig is attached.

Fig. 5A is a front view of the adjustment jig.

Fig. 5B is a side view of the adjustment jig.

Fig. 6 is a flowchart of the guide bush fixing control.

Fig. 7 is a flowchart of the guide bush fixing control.

Detailed Description

Fig. 1A and 1B are front views of an automatic lathe 1 as a machine tool including a guide bush control device according to the present invention. The cover 2 of the automatic lathe 1 is provided with a machining chamber door 3 and a spindle side door 5 (hereinafter referred to as "doors 3 and 5") which can be opened and closed freely. The processing chamber 4 formed in the cover 2 is provided with a spindle 6, a guide bush device 7, a tool post 8, and the like as shown in fig. 2.

As shown in fig. 3, the spindle 6 is driven to rotate by a spindle motor 9, and a guide bush 11 provided in the guide bush device 7 is driven to rotate by a guide bush motor 12. A headstock (not shown) on which the tool rest 8 and the spindle 6 are mounted is driven and moved by an X-axis motor 13, a Y-axis motor 14, a Z-axis motor 16, and the like. Each motor is controlled by a control device 17 constituted by an NC device.

The control device 17 is provided with an operation panel 18 for performing operations of the control device 17 and the like. The operation panel 18 is provided with a manual pulse handle 48, various kinds of selector switches, a monitor 49, and the like, and is connected to the control device 17 side. A machining program 19 is input in advance into the control device 17. The control device 17 can control motor amplifiers (motor amps) 9a, 12a, 13a, 14a, and 16a serving as drive devices for the motors 9, 12, 13, 14, and 16 in accordance with the machining program 19 to control the motors 9, 12, 13, 14, and 16 and control the spindle 6, the guide bush 11, the tool post 8, and the like.

The spindle 6 holds the rod-shaped material 23 inserted from the rear. The material 23 held by the main shaft 6 is inserted into the guide bush 11. The guide bush 11 has an inner diameter adjusted according to the diameter of the material, and guides the material 23 by allowing the axial movement and rotation of the material 23 while being rotationally driven by the guide bush motor 12.

In the automatic operation mode of the control device 17, the automatic lathe 1 of the present invention can automatically perform a predetermined machining on the material 23 by the tool 24 attached to the tool post 8 while guiding the material 23 by the guide bush 11 in response to the machining program 19. In the manual execution mode of the control device 17, the automatic lathe 1 of the present invention can execute the machining program 19 in accordance with the pulse signal generated in response to the rotation operation of the manual pulse handle 48, and manually perform the machining operation of the material 23.

The guide bush device 7 is attached to a guide bush support base 26 erected on the base side of the automatic lathe 1, and is configured by taking an outer sleeve 27 detachably fixed to the guide bush support base 26 as a housing thereof. The guide bush 29 is rotatably supported in the outer sleeve 27 by a bearing 28. The guide bush 11 is inserted into the guide bush 29.

The guide bush 29 is formed with a tapered surface corresponding to the tapered surface of the guide bush 11. The guide bush 11 is disposed in the guide bush 29 in a state where the tapered surfaces abut against each other. The guide bush 11 is in a rotation-locked state with respect to the guide bush sleeve 29 by a pin 31. An adjusting nut 32 is screwed to the rear end of the guide bush 11.

The guide bush 11 is moved in the axial direction with respect to the guide bush 29 by rotating the adjusting nut 32. The inner diameter dimension of the guide bush 11 is adjusted in accordance with the state in which the tapered surfaces are pressed against each other by the movement. The adjusting nut 32 is screwed with a bolt 33 having an enlarged outer diameter at a rear end thereof. The adjusting nut 32 is positioned and fixed with respect to the guide bush 29 by being pressed against the inner wall of the guide bush 29 with the rear end portion expanded in outer diameter by the locking of the bolt 33.

The guide bush 11 is adjusted to a predetermined inner diameter and fixed by positioning and fixing the adjusting nut 32 at a predetermined rotational angle position with respect to the guide bush 29. The outer diameter of the rear end portion of the adjusting nut 32 is restored by loosening the bolt 33, so that the adjusting nut 32 can be rotated, and the inner diameter of the guide bush 11 can be adjusted.

A timing pulley (timing pulley)36 integrated with a pin 34 is attached to the rear end side of the guide bush 29. The guide bush motor 12 is mounted on a guide bush support table 26. A timing pulley 38 is fixed to the rotation shaft of the guide bush motor 12.

A timing belt 39 is hung between the two timing pulleys 36, 38. The guide bush 11 is rotationally driven integrally with the guide bush 29 by driving of the guide bush motor 12. In the guide bush device 7 of the present invention, the guide bush 11 is a rotary guide bush rotationally driven by the guide bush motor 12.

As shown in fig. 4, an adjustment jig 41 for operating the adjustment nut 32 is provided so as to be attachable to and detachable from the guide bush device 7. As shown in fig. 5A and 5B, the adjustment jig 41 is formed with a flange 42 and a notch 43. An adjusting pin 44 protrudes from the front end surface of the adjusting fixture 41. The adjustment jig 41 is provided with a jig 46 for a bolt for rotating the operation bolt 33 (see fig. 2).

When the adjusting nut 32 is operated, the adjusting jig 41 is inserted into the outer sleeve 27 from the rear side with the outer peripheral surface of the flange 42 as a guide. A rear end surface of the adjusting nut 32 is formed with a plug hole 47 into which the adjusting plug 44 is inserted. The adjustment pins 44 can be inserted into the pin holes 47 by inserting the adjustment jig 41 into the outer sleeve 27.

The inner diameter of the guide bush 11 can be adjusted by rotating the adjusting nut 32 by loosening the bolt 33 by rotating the bolt jig 46, inserting the adjusting pin 44 into the pin hole 47, and rotating the adjusting jig 41. After the inner diameter of the guide bush 11 is adjusted, the adjustment jig 41 is pulled out from the outer sleeve 27. The adjustment jig 41 is attachable to and detachable from the guide bush 11 with the workpiece 23 inserted into the notch 43.

The controller 17 controls ON and OFF of a door lock 51 that restricts opening and closing of the doors 3 and 5. The doors 3 and 5 can be opened in a state where the door lock 51 is OFF (released). The doors 3 and 5 are closed in a state where the door lock 51 is ON and cannot be opened.

The operation panel 18 is provided with a door opening permission key 52 and a door lock release button 53. The door opening permission key 52 is provided so as to be capable of switching between the on position and the off position. The controller 17 releases the door lock 51 when the door open permission key 52 is in the open position and the door lock release button 53 is ON.

In the state where the door open permission key 52 is in the off position, the door lock 51 is not released even if the door lock release button 53 is ON. The operator can easily perform work such as inner diameter adjustment of the guide bush 11, adjustment, maintenance, and the like by opening the door 3 or the door 5.

The control device 17 has, as operation modes, an operation preparation mode for performing adjustment of the automatic lathe 1 and the like, in addition to the automatic operation mode and the manual operation mode described above. Each mode is selectively switched by a mode switch 54 of the operation panel 18. A plurality of menus are displayed in a menu bar 56 of the monitor 49 in response to the respective modes.

The operation panel 18 is provided with a menu key 57 capable of selecting various menus, and a start switch 58 for starting the menu selected by the menu key 57. The control device 17 is configured to: in the ready-to-operate mode, the selection key 57 selects "field excitation" ("GB excitation") as a menu.

The control device 17 of the present invention is provided with a handle restricting device 59 and a rotation restricting device 61. The signal based on the manual pulse handle 48 can be deactivated by means of the handle limiting means 59. The rotation drive of the guide bush motor 12, the spindle motor 9, and the like when the manual pulse handle 48 is rotated is restricted by operating the handle restricting device 59.

The rotation restricting device 61 is configured to: when each motor is instructed to rotate, the number of rotations of the motor is forcibly changed to 0. Even if the guide bush motor 12 and the spindle motor 9 are instructed to rotate at a predetermined number of rotations by the machining program 19 or the like, the rotation restricting device 61 is operated to forcibly set the number of rotations to 0 and drive the corresponding motor amplifiers 12a and 9a, thereby restricting the rotations of the guide bush motor 12 and the spindle motor 9.

By stopping the operation of the handle stopper 59, the operator manually rotates the manual pulse handle 48 to execute the machining program 19, thereby enabling the automatic lathe 1 to be manually operated. By stopping the operation of the rotation restricting device 61, each motor is rotationally driven at the number of rotations instructed by the machining program 19 or the like.

The controller 17 can selectively switch the synchronous opening/closing (on/off) of the guide bush motor 12 and the spindle motor 9. When the guide bush motor 12 and the spindle motor 9 are in a synchronized state, they are driven and controlled integrally with the spindle motor 9. When the shoe motor 12 and the spindle motor 9 are in an asynchronous state, they are driven and controlled independently.

The guide bush 11 and the spindle 6 can be rotationally driven in synchronization by synchronizing the guide bush motor 12 and the spindle motor 9. The guide bush 11 and the spindle 6 can be rotationally driven by asynchronous driving of the guide bush motor 12 and the spindle motor 9.

When the guide bush motor 12 is excited in a state where the rotation is stopped, a holding torque for holding a stop position of the rotor of the guide bush motor 12 is obtained. By exciting the guide bush motor 12 in the rotation stopped state, the rotation stopped state of the guide bush motor 12 can be maintained by the above-described holding torque, even if an external force acts on the rotation shaft of the guide bush motor 12. In the guide bush device 7 of the present invention, the rotation shaft of the guide bush motor 12 and the timing pulley 36 are connected by the timing belt 39, and therefore, the guide bush 11 is fixed in a non-rotatable state by exciting the guide bush motor 12 in a rotation stop state.

For example, the motor amplifier 12a is subjected to a "0-speed rotation command" for rotating the liner motor 12 at a speed of 0 or a "C-axis control command" for maintaining the stop position of the liner motor 12 at a predetermined rotation angle from the control device 17, whereby the liner motor 12 can be excited in a state where the rotation is stopped.

In the case where the guide bush motor 12 and the spindle motor 9 are synchronized, the "0-speed rotation command" and the "C-axis control command" may be commands to only the spindle motor 9 (motor amplifier 9a) in addition to the command to the guide bush motor 12 (motor amplifier 12a) to stop the guide bush motor 12 in an excited state.

By the control device 17 giving the "0-speed rotation command" and the "C-axis control command" to the motor amplifier 9a of the spindle motor 9 or the motor amplifier 12a of the guide bush motor 12, the guide bush motor 12 can be excited in a state where the rotation is stopped, and the guide bush 11 can be fixed so as not to rotate.

The control device 17 of the present invention is configured to: when the guide bush motor 12 and the spindle motor 9 are synchronized, the two motors 9 and 12 are excited. In the present embodiment, the control device 17 can also perform "synchronization command" to the motor amplifier 9a of the spindle motor 9 and the motor amplifier 12a of the guide bush motor 12 to fix the guide bush 11 so as not to be rotatable.

In the guide bush device 7 of the automatic lathe 1 according to the present invention, since the rotary guide bush is used, the adjustment (for example, inner diameter adjustment) of the guide bush 11 by the adjustment jig 41 needs to be performed in a state where the rotation of the guide bush 11 is restricted. When the operator switches the control device 17 to the operation preparation mode to adjust the guide bush 11, selects "guide bush excitation" in the menu, and sets the start switch 58 ON, the control device 17 operates according to the guide bush fixing control shown in the flowcharts of fig. 6 and 7.

The control device 17 is configured to: the operation is performed by the guide bush fixing control, and the guide bush fixing device functions as a guide bush fixing device for exciting the guide bush motor 12 and fixing the guide bush 11 in a rotationally fixed manner when the guide bush 11 is adjusted. The operator can easily adjust the guide bush 11 by restricting the rotation of the guide bush 11 by the guide bush fixing device.

As shown in fig. 6 and 7, in the above-described guide fixing control, first, the ON of the start switch 58 is checked in step S1, and the operation preparation mode and the selection as the menu "guide excitation" are confirmed in steps S2 and S3. The excitation of the liner motor 12 is performed when the "liner excitation" is selected in the operation preparation mode, and therefore, the excitation is terminated when the operation preparation mode is not performed or when the "liner excitation" is not selected.

When the menu "guide excitation" is selected in the operation preparation mode, the door lock 51 is confirmed in step S4. When the door lock 51 is ON, it is determined that the doors 3 and 5 are closed, and the process proceeds to step S5 and step S6, and the handle stopper 59 and the rotation stopper 61 are operated, and then the process proceeds to step S7.

In step S4, when the door lock 51 is OFF, it is determined that the doors 3 and 5 can be opened, and the check is repeated until the door lock 51 is ON. In step S7, the motor amplifier 12a of the guide bush motor 12 or the motor amplifier 9a of the spindle motor 9 is excited to stop the rotation of the guide bush motor 12 by performing the "0-speed rotation command", the "C-axis control command", and the "synchronization command", thereby fixing the guide bush 11 so as to be unrotatable.

After the guide bush motor 12 is excited in the rotation stopped state, the state of the door lock release button 53 is checked in step S8, and if the door lock release button 53 is ON, the routine proceeds to step S9, and the state of the door open permission key 52 is checked. When the door open permission key 52 is turned on in step S9, the process proceeds to step S10 to unlock the door lock 51, and the operator can open the doors 3 and 5.

Since the guide bush 11 is fixed so as to be unable to rotate, the operator can easily adjust the guide bush 11 by opening the doors 3 and 5 and rotating the adjustment nut 32 with the adjustment jig 41. If the door open permission key 52 is not turned on in step S9, the process proceeds to step S11, and the door lock 51 is continuously locked, so that the operator needs to turn on the door open permission key 52 to open the doors 3 and 5.

Then, the operation mode is checked in step S12, and when the mode is the operation preparation mode, the operation proceeds to step S13 and the selected state of the key selection button 57 is checked. In step S13, if the menu selection state is "guide excitation", the process returns to step S8 to confirm the state of the door lock release button 53, and the subsequent steps are repeated.

When the mode is other than the operation preparation mode in step S12 and the mode is other than the "guide excitation" selected as the menu in step S13, the sequence proceeds to step S14, step S15, step S16, and step S17, so that the selection of the "guide excitation" is released, the excitation of the guide motor 12 is turned off, and the operation of the grip limiting device 59 and the rotation limiting device 61 is stopped, thereby ending the operation.

After the guide motor 12 is excited, the operation mode is switched to a mode other than the operation preparation mode, or a menu other than "guide excitation" is selected by the selection button 57 to restore the control device 17, so that the fixing of the guide 11 can be released, and normal automatic operation can be performed.

In the operation preparation mode, "guide bush excitation" is selected by the selection button 57, and the start switch 58 is turned ON, so that when the doors 3 and 5 are closed and the door lock 51 is turned ON, the guide bush 11 can be fixed so as to be unrotatable by the excitation of the guide bush motor 12.

Accordingly, when the guide bush adjustment is performed by the adjustment jig 41, the operator does not need to restrict the rotation of the guide bush 11 by using a wrench or the like as in the conventional art, and can easily perform the adjustment of the guide bush 11. Since the start of excitation of the liner motor 12 is performed in a state where the doors 3 and 5 are closed and locked, the operator can open the doors 3 and 5 and perform liner adjustment after confirming that the liner 11 is not rotated by a malfunction or the like.

Before the door 3 or 5 is opened and the guide bush 11 is adjusted by the adjusting jig 41, the door 3 or 5 can be opened and the adjustment work can be performed, for example, after the guide bush 11 is confirmed to be in a stopped state, when the adjustment work of the guide bush is performed. Accordingly, safety of work and the like can be improved, and adverse effects due to erroneous rotation of the guide bush 11 and the like can be prevented.

Since the excitation of the guide bush motor 12 is performed in a state where the handle restricting device 59 and the rotation restricting device 61 are operated, even when the control device 17 generates a command to rotate the guide bush motor 12 by a predetermined number of rotations due to malfunction or the like, the rotation of the guide bush motor 12 is restricted, so that the guide bush can be prevented from rotating erroneously at the time of guide bush adjustment.

In addition to the automatic lathe 1 in which the spindle 6 and the guide bush 11 are respectively rotationally driven by the guide bush motor 12 and the spindle motor 9 provided separately as in the above-described embodiments, there is also known an automatic lathe in which a spindle and a guide bush are connected to each other and the spindle and the guide bush are driven by a common spindle motor.

In the case of the automatic lathe in which the main spindle and the guide bush are driven by a common spindle motor, the spindle motor is excited in a state where rotation is stopped by performing the "0-speed rotation command" or the "C-axis control command" on the motor amplifier of the spindle motor, and the guide bush is fixed so as to be unrotatable.

The application claims priority based on patent application No. 2013-.

(description of reference numerals)

1: automatic lathes (machine tools); 3: a processing chamber door (door); 4: a processing chamber; 5: a spindle side door (door);

6: a main shaft; 9: a spindle motor; 11: a guide bush; 12: a guide bush motor; 17: a control device;

48: a manual pulse handle (manual operating means); 59: a handle restricting device (manual operation restricting device);

61: rotation limiting device