JPS6355426B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a turret device used in a turret tool post or the like of a machine tool.

BACKGROUND OF THE INVENTION A turret device is a device that rotates a turret table around its center line and fixes it at a plurality of rotational positions, and its typical field of application is the turret tool rest of a machine tool.

The turret tool post holds a plurality of cutting tools and positions them selectively at cutting positions.The turret turret can hold 4 or 6 cutting tools depending on the number of cutting tools it can hold, that is, the number of rotation stop positions. Various types such as head, eight head, etc. are in practical use. Generally, they can be rotated by equal angles, but there are some special ones that can be rotated by unequal angles.

In such a turret tool post, it is necessary to accurately position the turret table that supports the tool post at a predetermined rotational position, and to fix it to the turret table with sufficient strength to withstand the cutting force. Therefore, interlocking couplings are commonly used. That is, a coupling body is fixed to each of the turret table and the turret stand, and these coupling bodies are engaged with each other by a plurality of meshing teeth formed on mutually opposing surfaces, so that the turret table can be moved to a predetermined position. It is configured to position the turret table in position and to counteract the rotational torque generated in the turret table based on the cutting force. Therefore, when it becomes necessary to rotate the turret table, it is necessary to move one coupling body axially together with the turret table to disengage it from the other coupling body.

For this reason, conventionally, the turret table and one coupling body were first moved a certain distance in the axial direction to disengage the two coupling bodies, and after checking with a disengagement detection switch, the turret table was rotated. However, in this case, a dwell must be provided between the end of the axial movement and the start of rotation, which is one of the causes of prolonging the time required for rotation of the turret table.

If a turret device that requires a long time for the turret table to rotate from one rotational position to another rotational position is used for the turret tool rest, the machining efficiency of the machine tool will decrease. This situation is the same even when the turret device is used for other purposes.

Purpose of the Invention The present invention has been made against the background of the above-mentioned circumstances, and consists of (a) a turret stand, (b) a turret table held rotatably and movably in the axial direction by the turret stand, and (c) a turret table that is rotatably and axially movable by the turret stand. First and second gears are fixed to the turret table and the turret stand, respectively, and have a plurality of meshing teeth formed along one circumference centered on the center line of the turret table on surfaces facing each other in the axial direction. (d) a coupling control device for moving the turret table in the axial direction to engage and disengage both the coupling bodies; and (e) a table rotation device for rotating the turret table; To provide a turret device in which a turret table is fixed at a plurality of rotational positions by second coupling bodies being engaged with different relative phases, and which requires the shortest possible time to rotate the turret table. It was done for that purpose.

Structure of the first invention The first invention is characterized in that the meshing teeth of the first and second coupling bodies have a trapezoidal cross-section, and the first and second coupling bodies have a trapezoidal cross-sectional shape. A detachment detection device for detecting detachment of the tooth surface of the body is provided, and the drive source of the table rotation device is a DC motor, and the coupling control device controls the control device of the DC motor. When separating the body from the second coupling body, a small current is supplied to the DC motor to keep the tooth surfaces of the meshing teeth of the first coupling body in contact with the tooth surfaces of one side of the meshing teeth of the second coupling body. After the detachment detection device detects detachment, a large current in the same direction as the small current is supplied to rotate the DC motor at a higher speed than before. It's what I did.

Functions and Effects of the First Invention In the turret device configured as described above, even in the process in which the meshing teeth of the first coupling body are separated from the meshing teeth of the second coupling body, the inclination of the tooth surface of the meshing teeth is accommodated. The first coupling body and the turret table are rotated at the same speed. Moreover, during this disengagement process, the turret table is prevented from rotating quickly by the engagement of the coupling body, so the moment the engagement is released, the turret table rotates at a faster speed than before. It begins to rotate.

Therefore, the next time a large current is supplied to the DC motor and the turret table begins to rotate in earnest, the turret table will already have a constant initial speed, and the turret table will start to rotate. The time required to increase the speed to the target speed is shortened, and the time required to rotate the turret table is correspondingly shortened. Moreover, in the conventional turret device, a dwell is provided after the coupling is disengaged as described above until the turret table is driven to rotate, and during this time the turret table does not rotate. On the other hand, in the turret device according to the present invention, the turret table continues to operate even after the coupling is disengaged until a large current is supplied to the DC motor and the turret table is fully rotated. Since the turret table rotates at a certain speed, there is little waste of time, and from this point of view as well, the time required to rotate the turret table is shortened.

Furthermore, since only a small current is supplied to the DC motor during the separation process of the coupling body, the surface pressure on the meshing teeth of the coupling body will not become excessive, and the DC motor will not be overloaded. It doesn't cost anything. Conversely, in order to easily control the rotational torque by controlling the amount of supplied current, the present invention employs a DC motor as the rotational drive source for the turret table. Furthermore, since the DC motor is considerably cheaper than the servo motor, which is used as a rotational drive source for the turret table along with the hydraulic motor, it also has the effect of reducing manufacturing costs.

Furthermore, in conventional turret devices, when the coupling disengages, the turret table wobbles, that is, swings at a minute angle, which reduces the product value.
In the turret device according to the present invention, the meshing teeth of the first coupling body and the second coupling body are kept in contact with each other on one side of the tooth surface during the coupling and disengagement process of the couplings, so that such wobbling can be avoided. Therefore, a turret device with high commercial value can be obtained.

Composition of the Second Invention Further, the second invention is characterized in that the DC motor control device according to the first invention is equipped with a rotation detector for detecting the rotation of the DC motor, and the rotation detector is connected to both coupling bodies. When a signal indicating detachment of the tooth surface is issued, the current supplied to the DC motor is switched from the small current to the large current.

Operation and Effect of the Second Invention When the first coupling body as described above separates from the second coupling body, the first coupling body rotates by a certain angle, and the amount of rotation is determined by the axial movement of the first coupling body. Since it is related to the amount of rotation, if the amount of rotation of the first coupling body, that is, the amount of rotation of the DC motor that drives it, is detected by a rotation detector, the amount of rotation detected will be the amount of time when the coupling is disengaged. When a sufficient amount of rotation is reached, separation of the tooth flanks of both coupling bodies can be detected. Therefore, immediately after the coupling is disengaged, a large current can be supplied to the DC motor to start full-scale rotation, and dwell can be substantially eliminated.

Furthermore, as mentioned above, even if the current supplied to the DC motor remains small, the rotational speed of the first coupling body and the turret table will increase to some extent at the moment the couplings are disengaged. Therefore, if the rotational speed is detected by a rotation detector, the detected rotational speed reaches a certain rotational speed that does not reach before the separation of the tooth flanks, but reaches after separation, so that the separation of the tooth flanks of both coupling bodies can be detected. can be detected. Therefore, it is also possible to switch the current supplied to the DC motor from a small current to a large current based on the detection result, and dwell can also be eliminated in this way.

In this way, according to the second invention, since the dwell can be eliminated, the time required for rotating the turret table can be further shortened compared to the case according to the first invention.

In addition, since the rotation detector that detects the rotation of the DC motor can also be used as a means for confirming the separation of the coupling, there is no need to provide a dedicated separation detection device, which reduces costs and allows for detection of separation. Another advantage of the second invention is that troubles caused by equipment failure can be avoided.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a system diagram showing an embodiment of the present invention applied to a turret device for a turret tool rest for a turret lathe. In the figure, numeral 10 is the turret rest. The turret table 10 is fixed to the slide of the lathe, and a turret shaft 12 is provided through the turret table 10 so as to be rotatable and slidable in the axial direction. 14 is fixed. A tool rest (not shown) is fixed to this turret table 14 to form a turret tool rest.

Coupling bodies 15 are provided on opposing surfaces of the turret table 10 and the turret table 14, respectively.
and 16 are fixedly installed. That is, as shown in FIG. 2, a plurality of meshing teeth 17 and 18 having a trapezoidal cross-sectional shape are formed on the upper surface of the turret table 10 and the lower surface of the turret table 14, respectively, and these portions are connected to the coupling bodies 15 and 16. It constitutes. The meshing teeth 17 and 18 are connected to the turret shaft 12.
They are formed at equal angular intervals along one circumference centered on the axis of the turret table 14, that is, the center line of the turret table 14. The tooth surfaces 19 and 20 of the meshing teeth 17 and 18 are inclined at an angle θ with respect to the axial direction,
The cross-sectional shape of the meshing teeth 17 and 18 is trapezoidal. Further, when the meshing teeth 17 and 18 are in mesh, the tooth surfaces 19 and 20 on both sides of each tooth are in close contact with each other, as shown by two-dot chain lines in FIG.

A cylinder 21 is fixed to the surface of the turret base 10 opposite to the side on which the meshing teeth 17 are formed. The turret shaft 12 also extends through this cylinder 21, and the cylinder 2 of the turret shaft 12
A piston (not shown) is fixed to a portion located inside 1. The piston of the cylinder 21 is actuated by hydraulic oil being supplied through the electromagnetic switching valve 24 which is operated by the switching valve drive circuit 22, and moves the turret shaft 12 and the turret table 14 in the axial direction. It's becoming like that. As the turret table 14 moves in the axial direction, the coupling body 16 integrally formed therewith also moves and engages with another coupling body 15 integrally formed with the turret table 10. These coupling bodies 15 and 16 constitute a meshing coupling, and the cylinder 21, piston, electromagnetic switching valve 24, etc. form a coupling engagement/disengagement mechanism 25.
is made up of.

A spur gear 26 is fixed to a portion of the turret shaft 12 that protrudes from the cylinder 21, and meshes with a spur gear 30 of the intermediate shaft 28. The spur gears 26 and 30 are configured to transmit the rotation of the intermediate shaft 28 to the turret shaft 12 while allowing the turret shaft 12 to move in the axial direction as described above. It is designed to be rotated by a DC motor 36 via a worm wheel 32 and a worm wheel 34. That is, the turret shaft 12, spur gear 26, intermediate shaft 28, spur gear 3
A turret table rotation drive mechanism 37 is comprised of a worm 32, a worm wheel 34, a DC motor 36, and the like.

An incremental encoder 38 is attached to the DC motor 36.
This constitutes a rotation detector that detects the rotation amount of 6. This encoder 38 is of a two-phase output type, and is connected to the DC motor 36 and the turret table 14.
The direction of rotation can also be detected.

Further, a disk-shaped dog 40 is attached to the turret shaft 12.
is fixed, and together with the transmission type photo sensor 42 constitutes a rotational position detector for the turret table 14. That is, as shown in FIG. 3, transmission holes 44 are formed on four concentric circles with different diameters of the dog 40, and these holes
The light is detected by two four sets of light emitters 46 and light receivers 48. In FIG. 3, a case is illustrated in which the dog 40 is rotated by 90 degrees, and one transmission hole 44 is formed in each of four concentric circles at 90 degree intervals. Fifteen types of information can be obtained depending on which of the concentric circles the transmission hole 44 is formed, and fifteen rotational positions of the dog 40 can be detected by the transmission type photo sensor 42.

The dog 40 further includes a reflective photo sensor 50.
The mesh detector is constructed in collaboration with the That is, when the coupling body 16 is separated from the coupling body 15, the dog 40 is in the position shown by the solid line in FIG.
In the engaged state of No. 15, it is moved to the position shown by the broken line, so the reflective photo sensor 50 detects this movement and issues an engagement detection signal.

The electromagnetic switching valve 24 and the DC motor 36 are
It is controlled by a CPU (central processing unit) 60.
That is, the electromagnetic switching valve 24 is connected to the CPU 60 via the switching valve drive circuit 22 and the I/O port 62.
Further, the DC motor 36 is connected to the CPU 60 via a DC motor drive circuit 64, a D/A converter 66, and an I/O port 62. The CPU 60 further includes the encoder 38,
The transmission type photo sensor 42 and the reflection type photo sensor 50 are connected via the I/O port 62, and the NC device 68 that controls the entire turret lathe to which the turret tool post of this embodiment is attached is also connected via the I/O port 62. It is becoming more and more connected. In addition, ROM (read only memory) 7
0 stores programs for controlling the operation of the entire turret device, including the motor speed control program shown in FIG. 5, and the CPU 60 performs control according to this program. A RAM (random access memory) 72 and a programmable timer 74 are provided to assist in this control.

In the figure, 78 is a deviation amplifier, to which a reference voltage of 6 volts is applied as well as the output voltage of the D/A converter 66. The deviation amplifier 78 is
The deviation between the output voltage of the D/A converter 66 and the reference voltage is amplified and outputted to the pulse width modulator 80. The pulse width modulator 80 pulse width modulates the input voltage and outputs it to the power transistor circuit 82. Output to. The power transistor circuit 82 is provided with power transistors for forward rotation and reverse rotation, and a DC power source 84 is connected to these power transistors. Therefore, the power transistor for forward rotation or reverse rotation is made conductive by the output signal from the pulse width modulator 80, so that current for forward rotation or reverse rotation is supplied to the DC motor 36. is supplied. and,
The terminal voltage of the DC motor 36 is fed back to the drive circuit 64 by the DC motor, and the current supplied from the DC power supply 84 to the DC motor 36 is duty-controlled so that this terminal voltage becomes equal to the target value, which is the output voltage of the deviation amplifier 78. It is becoming more and more common.

More specifically, the D/A converter 6
If an output voltage of 6 volts, which is equal to the reference voltage from 6 to 6, is applied to the deviation amplifier 78, the target value is 0 volts, and the DC motor drive circuit 64 sets the terminal voltage of the DC motor 36 to 0 volts. That is, the DC motor 36 is controlled to be stopped. The output voltage of 6 volts from the D/A converter 66 is the stop command voltage. Also,
If the output voltage of the D/A converter 66 is 6 volts or more, the DC motor 36 is controlled to rotate in the forward direction, and when the output voltage of the D/A converter 66 reaches 12 volts, the DC motor 36 is controlled to rotate in the forward direction. is rotated at the rated speed. D/A converter 66
The output voltage greater than 6 volts is the forward rotation command voltage. Further, if the output voltage of the D/A converter 66 becomes smaller than 6 volts, the DC motor 36
is rotated in the opposite direction, and the D/A converter 66
When the output voltage of the motor reaches 0 volts, the rated rotational speed in the reverse direction is reached. The output voltage smaller than 6 volts is the reverse direction rotation command voltage.

As is clear from the above description, in this embodiment, the CPU 60, ROM 70, RAM 72, etc., together with the coupling engagement/disengagement mechanism 25, the switching valve drive circuit 22, etc. constitute a coupling control device that engages/disengages the coupling at an appropriate time. At the same time, the turret table rotation drive mechanism 37, the DC motor rotation drive circuit 64, and the D/A converter 6
Together with the turret table 6 and the like, it constitutes a table rotation device that rotates the turret table 14 to an appropriate position. In addition, the CPU6 in this table rotation device
0, ROM 70, RAM 72, programmable timer 74, D/A converter 66, DC motor drive circuit 64, etc. constitute a control device for DC motor 36.

Next, the operation will be explained with reference to the flowchart of FIG. 6 and the graph of FIG. 7.

The turret on the turret table 14 is fixed at a certain rotational position, and when another cutting tool is required after a predetermined cutting has been performed on the NC lathe, the tool is transferred from the NC device 68 to the I/O port 62. A command is then supplied to the CPU 60 to rotate the turret table 14, for example from position 1 to position 2, in order to position the intended cutting tool. Based on this command, steps S1 and S2 of the flowchart of FIG. 6 are executed. That is, the CPU 60 should output a signal to the switching valve drive circuit 22 to instruct switching of the electromagnetic switching valve 24 to disengage the coupling, and at the same time, the D/A converter 66 should supply a small current to the DC motor 36. Outputs a signal that instructs the user to do the following. When the electromagnetic switching valve 24 is switched, hydraulic pressure in the opposite direction is supplied to the cylinder 21, and the turret shaft 12 is moved to the turret base 10.
The coupling body 16 on the turret table 14 side is moved in the direction of protruding from the turret table 1.
At the same time, a small current is supplied to the DC motor 36 from the DC motor drive circuit 64 in the forward rotation direction or in the reverse rotation direction. Therefore, the DC motor 36 attempts to rotate the turret table 14 with a relatively small torque, but at this stage the coupling bodies 15 and 16 are still in mesh, and the turret table 14 does not rotate. I don't get it. That is, the tooth surface 20 of the meshing tooth 18 is pressed against the tooth surface 19 of the meshing tooth 17 with a relatively small force, and since the turret table 14 moves in the direction away from the turret table 10 in this state, the meshing tooth 18 moves in the direction shown by arrow A along the inclined tooth surface 19 of the meshing tooth 17. As a result, the DC motor 36 maintains a constant speed even during this process, as shown in FIG.
Vb (initially, the rotational speed of the DC motor 36 is not constant because the coupling removal speed is not constant, but once the coupling separation speed becomes constant, the rotational speed of the DC motor 36 also becomes constant). However, this rotational speed is forcibly suppressed to a lower value than the speed at which the DC motor 36 would rotate if the coupling bodies 15 and 16 were not in a meshed state. The magnitude of the small current should be selected so that problems such as coil burnout do not occur.
Furthermore, since the tooth surface 19 of the meshing tooth 17 and the tooth surface 20 of the meshing tooth 18 will be sliding, it is not preferable for them to be pressed together with too much force, and from this point of view as well, the magnitude of the small current is a constraint. receive.

As described above, the coupling bodies 15 and 16 are separated from each other while the tooth surfaces 19 and 20 are in close contact with each other, so there is a certain relationship between the amount of axial movement and rotation of the coupling body 16. , meshing tooth 18
When it moves in the circumferential direction by a distance l corresponding to the meshing depth h with the meshing teeth 17, it comes off from the meshing teeth 17. Since the amount of rotation of the coupling body 16 corresponds to the amount of rotation of the DC motor 36, the amount of rotation of the coupling body 16 corresponds to the amount of rotation of the DC motor 36. Know when to leave. Therefore, when the number of pulse signals from the encoder 38 becomes larger than the number corresponding to the circumferential movement distance l of the meshing teeth 17, the CPU 60 determines that the DC motor 36 has rotated enough to separate the coupling. It is determined that the signal shown in FIG. A command signal indicating what to do is issued (steps S3 and S4).
This period is represented by the number of pulses C _u of the encoder 38 in FIG _. The turret table 14
Since the rotation speed of the DC motor 3 increases, when the supply of rated current to the DC motor 36 is started, the rotation speed of the DC motor 3 increases.
6 has already started speeding up. Therefore, the DC motor 36 has a rated rotation speed Vr (in this embodiment,
1800 rpm), and the turret table 14 has already rotated by a certain angle by the time the rated current starts being supplied to the DC motor 36. The time required for the motor to rotate from position 1, where it had been stopped, to position 2 is shortened.

While the DC motor 36 is rotating at the rated speed Vr, steps S4 and S5 are repeatedly executed, and the number of pulses from the encoder 38 is
The target position where the motor is scheduled to stop (direct current motor 36 corresponding to position 2 of the turret table 14)
When the number of pulses corresponding to the pre-deceleration point a certain amount of rotation before the rotation position) is reached, step S6
is executed and the D/A converter 6 is transferred from the CPU 60.
A stop command signal is issued to the DC motor drive circuit 64 via the DC motor drive circuit 64. Therefore, the DC motor drive circuit 64 starts controlling the DC motor 36 to stop, and the DC motor 36 is decelerated. In this deceleration process, steps S6 and S7 are repeatedly executed, and when the speed of the DC motor 36 reaches a predetermined intermediate speed Vm, step S8 is executed to reduce the rotational speed of the DC motor 36 to that intermediate speed. The CPU is kept at Vm (600 rpm in this example).
60 controls the speed command signal. Note that the rotational speed of the DC motor 36 is determined by the CPU 60 with the aid of the programmable timer 74 from the time interval of pulse signals from the encoder 38.

While the DC motor 36 is being rotated at the intermediate speed Vm, steps S8 and S9 are repeatedly executed, and when the number of output pulses of the encoder 38 reaches _C3 , which is scheduled as the final deceleration point, step S10 is executed. This is executed, and a rotation command voltage in the opposite direction (voltage instructing to rotate the DC motor 36 in the opposite direction) is applied to the DC motor drive circuit 64. the result,
The DC motor 36 is suddenly decelerated, but in this process, steps S10 and S11 are repeated until the rotational speed of the DC motor 36 falls below the set low speed Vs (290 rpm in this embodiment). At this time, step S12 is executed and a stop command signal is issued. In other words, the reverse direction rotation command voltage that had been supplied to the DC motor drive circuit 64 via the D/A converter 66 is switched to the stop command voltage, and the DC motor 36 is controlled so that the number of output pulses from the encoder 38 is almost constant.
Stop when C ₄ is reached.

That is, in order to stop the DC motor 36, a stop command voltage is first applied to the DC motor drive circuit 64, and the DC motor 36 is brought to an intermediate speed.
When Vm is reached, a rotation command voltage to maintain the intermediate speed Vm is applied, a rotation command voltage in the opposite direction is applied, and finally a stop command voltage is applied again. This is due to the following reasons. DC motor 36
Simply applying a stop command voltage to the DC motor drive circuit 64 while the DC motor 36 is rotating at the rated speed will take a long time to stop the DC motor 36, and there will be large variations in the stopping position. Further, if a rotation command voltage in the opposite direction is applied from a state where the motor is rotating at the rated speed, although the motor stops in a short time, large variations in the stop position occur as described above. This variation is explained by the turret table 1
This is caused by unbalanced loads due to cutting tools attached to 4, changes in load inertia, temperature changes in the motor and control circuit components, etc. Therefore, the rotational speed of the DC motor 36 is temporarily changed to an intermediate speed.
When the DC motor 36, which has been decelerated to Vm and is rotating at an intermediate speed Vm, reaches the final deceleration point,
The rotation command voltage in the opposite direction is sent to the DC motor drive circuit 64.
It was decided that the speed of the DC motor 36 would be rapidly reduced by applying the current to the DC motor 36. If the DC motor 36 is to be suddenly decelerated from the relatively low intermediate speed Vm by applying a rotation command voltage in the opposite direction, it is decelerated by similarly applying a rotation command voltage in the opposite direction from the rated speed. The variation in the stop position is smaller than in the case where the turret table 14 is stopped at an accurate position. Furthermore, when the speed of the DC motor 36 reaches the set low speed Vs,
The reason why the rotation command voltage in the reverse direction is switched to the stop command voltage is that if the rotation command voltage in the reverse direction is applied to the end to stop the DC motor 36, the rotation in the reverse direction after the stop is stopped. This is because the positioning is not possible because the positioning is started. Conversely, it is desirable that the set low speed Vs be set to the lowest possible speed without causing such problems. Incidentally, it has been confirmed through experiments that when stopping the DC motor 36 as in this embodiment, it can be stopped with an error of about 1/10 or less compared to when stopping only by applying a stop command voltage. There is.

During the deceleration process of the DC motor 36 as described above, the CPU 60 issues a switching command signal for the electromagnetic switching valve 24 to the switching valve drive circuit 22 . That is, when the relative positions of the meshing teeth 18 of the coupling body 16 and the meshing teeth 17 of the coupling body 15 are in the state shown in FIG. 8, the meshing teeth 18 and 17 can mesh with each other, so that the coupling body 16
It is possible to move the coupling body 16 closer to the coupling body 15 by switching the electromagnetic switching valve 24 before the rotation of the coupling body 15 completely stops, and as a result, the tooth surface 20 of the meshing tooth 18 is aligned with the tooth surface of the meshing tooth 17. 19, the meshing tooth 18 contacts the meshing tooth 1.
The rotation of the turret table 14 and the engagement of the coupling bodies 15 and 16 are performed in parallel, and the turret table 14 is moved in the direction shown by the arrow B along the tooth surface 19 of the The time required to move from position 1 to position 2 is also reduced here.

Further, since the DC motor 36 and the turret table 14 can be stopped at accurate positions, the heights of the meshing teeth 17 and 18 of the coupling bodies 15 and 16 can be lowered, and the height of the coupling bodies 16 for engagement and disengagement can be reduced. It becomes possible to reduce the amount of axial movement of the turret table 14, which also reduces the time required to rotate the turret table 14.

It is confirmed by the transmission type photo sensor 42 and the reflection type photo sensor 50 that the turret table 14 has been rotated to the target position and that the coupling bodies 15 and 16 are in the engaged state, respectively. For example, the CPU 60 sends a signal to the NC device 68 indicating that the rotation of the turret tool post has ended, and the NC device 68 starts control for the next cutting process.

In the above explanation, a case has been described in which the turret table 14 is rotated from one rotational position to an adjacent rotational position. However, in order to rotate the turret table 14 from one rotational stop position to another rotational stop position, Since it is easy for the CPU 60 to determine how far the turret table 14 should be rotated and in which direction the turret table 14 should be rotated to minimize the amount of rotation, it is possible to It is possible to make a short rotation to the position without stopping halfway.

In addition, even if the turret fixed to the turret table 14 is of various types, such as 4-head, 6-head, 8-head, etc., the deceleration position and final deceleration position are expressed in accordance with the various turrets. data in advance
If it is stored in the ROM 70, in actual use, all you need to do is select the one that corresponds to the turret you are actually trying to use from among the various data, and you can use the limit switch, dog, etc. as in the past. The setup can be easily changed without changing the control circuit or the like.

Furthermore, in this embodiment, each rotational position of the turret table 14 is detected by a rotational position detector consisting of a transmission type photo sensor 42 and a dog 40.
4 is stopped at one of the regular rotation stop positions, the rotational position of the turret table 14 can be absolutely detected. Therefore, even though the incremental encoder 38 is used as a rotation detector for the DC motor 36, even if the power is cut off while the turret device is in use, it is easy to change the current state of the turret table 14 after turning it on again. The position can be searched and work can be started without returning the turret table 14 to its original position.

The embodiment of the second invention has been described above in detail, but
A rotation detector for detecting the amount of rotation of the DC motor does not necessarily have to be attached to the DC motor itself, but can also be attached to any element rotated by the DC motor. Furthermore, it is not always essential to use a rotation detector that detects the amount of rotation of the DC motor in order to detect when the coupling has come off; instead, a dedicated detachment detection device such as a dedicated detachment detection switch is used as in the past. It is also possible, and this aspect constitutes an embodiment of the first invention. In this case, a dwell is provided between the time when the coupling is disengaged and the time when a large current is supplied to the DC motor, but the turret table is not fully used during this dwell. , since it rotates at a certain speed, the time required to rotate from one position to another is reduced.

Although not illustrated in detail, the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment in which the present invention is applied to a turret device for a turret tool post. FIG. 2 is an enlarged sectional view showing the meshing teeth of the coupling body used in the device of FIG. 1. FIG. 3 is a plan view of the rotation detector and engagement detector used in the apparatus of FIG. 1, and FIG. 4 is a front view of the same. FIG. 5 is a block diagram showing details of the DC motor drive circuit of FIG. 1. FIG. 6 is a flowchart of a program for controlling the rotation of a DC motor of the apparatus shown in FIG. FIG. 7 is a graph showing the speed control of the DC motor realized by the flowchart of FIG. FIG. 8 is a sectional view showing another operating state of the coupling body shown in FIG. 2. 10: Turret stand, 12: Turret axis, 14:
Turret table, 15, 16: Coupling body, 17, 18: Meshing teeth, 19, 20: Tooth surface, 2
5: Coupling engagement/disengagement mechanism, 36: DC motor,
37: Turret table rotation drive mechanism, 38: Encoder, 42: Transmissive photo sensor, 50: Reflective photo sensor, 80: Power transistor circuit.

Claims (1)

[Scope of Claims] 1. A turret table; A turret table supported by the turret table so as to be rotatable and movable in the axial direction; first and second coupling bodies having a plurality of meshing teeth formed along one circumference centered on the center line of the turret table on surfaces facing each other; and a table rotation device that rotates the turret table, and the first and second coupling bodies are engaged with each other in different relative phases, so that the turret table is rotated. In the turret device in which the turret table is fixed at a plurality of rotational positions, the meshing teeth of the first and second coupling bodies have a trapezoidal cross-sectional shape, and
A detachment detection device for detecting detachment of the tooth surfaces of the first and second coupling bodies is provided, and a drive source of the table rotation device is a DC motor, and a control device for the DC motor is provided.
When the coupling control device separates the first coupling body from the second coupling body, it supplies a small current to the DC motor so that the tooth surfaces of the meshing teeth of the first coupling body are aligned with the meshing teeth of the second coupling body. It slides on the tooth surface on one side and detaches from the tooth surface, and after the detachment detection device detects detachment, it supplies a large current in the same direction as the small current to make the DC motor move faster than before. A turret device characterized by rotating at high speed. 2. A turret table; A turret table supported rotatably and movably in the axial direction by the turret table; first and second coupling bodies having a plurality of meshing teeth formed along one circumference centered on the center line of the table; and moving the turret table in the axial direction to engage the coupling bodies. a coupling control device for disengaging the coupling; and a table rotation device for rotating the turret table; the first and second coupling bodies are engaged in different relative phases, so that the turret table can be rotated to a plurality of rotational positions. In the turret device fixed in the turret device, the meshing teeth of the first and second coupling bodies have a trapezoidal cross-sectional shape, and
The drive source of the table rotation device is a DC motor, and the control device for the DC motor includes a rotation detector for detecting the rotation status of the DC motor, and the coupling control device rotates the first coupling body to the first coupling body. When detaching from the second coupling body, a small current is supplied to the DC motor so that the tooth surface of the meshing tooth of the first coupling body slides on one side of the meshing tooth of the second coupling body while remaining in contact with the tooth surface of one side of the meshing tooth of the second coupling body. and when the rotation detector issues a tooth surface detachment response signal indicating that the rotational condition of the DC motor has reached a rotational condition corresponding to the time when the tooth surface of the coupling body is detached. A turret device characterized by supplying a small current and a large current in the same direction to rotate a DC motor at a higher speed than before. 3. The rotation detector detects the amount of rotation of the DC motor after the start of rotation as the rotation status, and the tooth flank separation response signal indicates that the DC motor has rotated by an amount sufficient for tooth flank separation. 3. The turret device according to claim 2, wherein the signal is a signal indicating . 4. The rotation detector detects the rotational speed of the DC motor as the rotational state, and the tooth flank detachment response signal indicates that the rotational speed of the DC motor does not reach before the tooth flank detaches, but after the tooth flank detaches. 3. The turret device according to claim 2, wherein the signal is a signal indicating that a certain rotational speed has been reached.