JPS6365463B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a table device capable of tilting movement;
In particular, the present invention relates to an inclined table used when performing machining or scribing work on a workpiece mounted on the table.

A conventional tilting table device has a worm with an operation handle that is rotatably provided on a fixed base, and a fan-shaped worm foil that engages with the worm is formed on the lower frame of the tilting table, so that the tilting table can be rotated freely on the fixed base. The tilting table supported by the machine was set at the desired tilt angle. However, when the inclination angle is set by the mechanical engagement of the worm wheel and the worm, the center of gravity of the workpiece fixed on the table generally moves depending on the inclination angle, and the rotational moment generated accordingly. The meshing portion of the worm, which bears half of the load, generates elastic strain in response to this, resulting in an error in the inclination angle setting value. Furthermore, an error corresponding to the amount of engagement back may occur in the worm engagement portion. This error occurs not only due to an increase in table load and tilt angle, but also due to changes in the magnitude of cutting force and changes in cutting direction that occur during machining.
In particular, it also occurs in cutting operations where the direction of the load is repeated in opposite directions, and its mode is different. Furthermore, in order to improve the engagement accuracy of the worm wheel and worm that determine the angle of inclination and its accuracy in the tilting table, high-precision machining has traditionally been required, and the materials are usually manufactured after careful consideration. However, it has been difficult to improve the accuracy of the inclination angle. In addition, as the table becomes larger based on the table load and the load increases due to the work load, wear is likely to occur in the serpentine worm engagement part.In order to cause backlash due to this wear, the allowable amount of the set inclination angle should be adjusted. The occurrence of the above-mentioned errors could not be eliminated. Furthermore, when performing machining while mechanically tilting the table using a worm, the larger the table load or the larger the load fluctuation, the greater the rotational torque required. As the torque fluctuates, the rotational speed of the worm shaft becomes uneven, and the setting control of the table inclination angle tends to lack smoothness.

The present invention eliminates the conventional direct meshing drive method by meshing a worm wheel and a worm, and discloses a drive method using a hydraulic servo control method that is completely unaffected by the load applied to the tilting table. This is an improved version of the various drawbacks that occur with tilting tables. That is, the driving force of a servo power cylinder, which is a component of a hydraulic servo mechanism, is used to directly drive the tilting table that carries a load, and the servo control valve device, which is another component of the servo mechanism, is used to control the drive of the servo power cylinder. This is done by That is, the stylus operating arm loosely fitted on the ear axis of the tilting table is brought into contact with the stylus of the servo control valve, and the stylus operating arm is connected via a worm wheel and a worm transmission system to adjust the tilt angle of the tilting table. The setting is maintained by the follow-up drive of a powerful servo power cylinder.

The present invention will be described in detail below with reference to embodiments shown in the accompanying drawings. FIG. 1 shows a diagram of the operating principle of a tilting table according to the present invention. The device is roughly divided structurally into a support frame base portion that supports the tilting table so as to be tiltable, a tilting table main body portion, and a hydraulic servo mechanism portion for imparting a desired tilt angle to the table. In FIG. 1, a tilting table 1 is tiltably and rotatably supported by bearings provided on a base frame via ear shafts 2 formed integrally with the lower portions of both sides of the table. A fan-shaped worm wheel 4 is rotatably fitted onto the ear shaft 2 on one side of the left and right ear shafts, a worm 5 is engaged with the worm foil 4, and a worm shaft 6 to which the worm 5 is fixed is attached. is supported by a bearing device provided in the tilting table frame 3. For example, when the worm is rotated by the worm handle 7 until the relative angle between the worm wheel 4 and the tilting table 1 reaches a predetermined value, the table is rotated as described below. The desired inclination angle is set via the hydraulic servo mechanism 40. Reference numeral 20 indicates a table clamp cylinder device for fixing the tilting table 1 to the base side when the tilting table 1 is set at a desired angle, and reference numeral 21 indicates the oscillating rotation of the worm shaft 6 during machining when the tilting table is fixed. The worm shaft clamp cylinder device for fixing the action is shown.

Reference numeral 40 indicates a hydraulic servomechanism system which is an important component of the present invention. The servo mechanism system 40 includes a servo power cylinder 41 pivotally fixed on the base by a pin pivot joint 42, and the power cylinder 41.
A servo control valve cylinder 50 for selectively supplying hydraulic oil into the left and right cylinder chambers of the servo valve, and a stylus actuator connected so as to be in constant contact with a stylus 85 (Fig. 2) attached to the free end of the servo valve rod 51. It is composed of an arm 8. The stylus operating arm 8 is integrally connected to a worm wheel 4 rotatably supported about the ear shaft 2. A worm 5 fixed to a worm shaft 6 which is integrally and rotatably supported on the table 1, and a stylus actuating arm 8 connected to a worm wheel 4 meshing with the worm 5 are connected to the ear shaft 2 integrally with the table. By pivoting around the stylus and rotating the worm 5, the stylus operating arm 8 changes its angle relative to the table. In response to this rotational operation of the worm shaft 6, the tip surface of the stylus operating arm 8, which is displaced relative to the table, detects and slightly moves the stylus 85.
Output oil passages 53 to 5 of the servo valve cylinder 50 connected to the oil pressure source 510 via the servo valve rod 51
4 to the left or right cylinder chamber of the servo power cylinder to selectively supply pressure oil.

Reference numerals 55 and 56 in the figure indicate known pilot check valves. Note that the connection circuit 63 is connected to the hydraulic power source 51.
This is a safety hydraulic circuit added to prevent an abnormal tilting accident of the tilting table that would occur if the supply oil pressure at 0 drops below a predetermined pressure for some reason. Furthermore, this device includes two types of hydraulic clamp systems, which are represented by a table clamp cylinder device 20 for clamping the tilting table 1 to the base side and a worm shaft clamp cylinder device 21 for clamping the worm shaft 6 to the table side. is included. These clamp cylinders are led from the same hydraulic power source 510 to a clamp valve cylinder with an operating handle through an oil passage 61 shown on the left side of the drawing, and by operating the clamp operating handle 60 in two positions, the outlet oil passage of the clamp on/off valve 24 is connected. 62 to oil passages 22 and 23
Pressurized oil is supplied to each clamp cylinder through. As will be described later, the table clamp cylinder device 20 is formed into a double piston type clamp device, and the table legs are gripped by the double pistons to prevent stress deformation of the tilting table caused by the one-way press clamp operation. I'm trying to avoid that.

The operation mode of the tilting table 1 will be explained below with reference to the principle diagram shown in FIG.

(i) When setting the tilt table 1 to a predetermined tilt angle, first press the clamp operation handle 60 in (a)
When manually operated to the position, the clamp on-off valve 2
4 is switched, and the oil passages leading from the oil pressure source 510 to the clamp oil passages 62, 22, 23 via the oil passage 61 and the clamp on/off valve 24 are shut off.
The clamp oil passage is opened to the oil tank oil passage 64, and the clamping action of the table and worm shaft is unlocked.

(ii) Next, the operation of tilting the surface of the tilting table counterclockwise from the horizontal direction by the tilting angle α will be explained. The worm 5 connected to the worm shaft 6 supported by a worm bearing (not shown) integrally provided on the tilting table frame 3 is rotated by the worm handle 7 by an amount corresponding to the inclination angle α. The worm wheel 4 meshing with the tilting table 1 also rotates clockwise by an angle α.

When the worm wheel 4 begins to rotate clockwise toward α, the stylus operating arm 8, which is integrally provided on the worm wheel 4, moves to the left, and as a result, the stylus operating arm 8 and the stylus 85 are However, the stylus 85 moves in the protruding direction (to the left in the figure) due to the elastic force of the compression spring built into the servo control valve cylinder 50, and the stylus 85 moves away from the servo control valve cylinder 50.
The spool valve forming the spool valve is displaced leftward from the neutral position where the supplied hydraulic oil is cut off, and the oil passage is switched to supply pressurized hydraulic oil to the cylinder working chamber on the left side of the servo power cylinder 41. Furthermore, Figure 1 is
The above servo control valve 50 is drawn from hydraulic diagram symbols based on the Jis standard, and the detailed structure of the above spool valve is not drawn, but in short, in this neutral position, the land part of the spool completely connects the inlet port for supplying pressure oil. This is a central position where the valve is blocked, and if the valve is displaced to the left or right from this neutral position, the inlet port is opened and pressurized oil is supplied to either the left or right cylinder working chamber of the power cylinder. That is, the oil passages formed in the above illustrated explanation are oil pressure source 510 → oil passage 52 → servo control valve 50 → output oil passage 53 → pilot check valve 55 → oil passage 57.
→Since the left working chamber of the servo power cylinder 41 forms a hydraulic pressure supply circuit, strong working hydraulic pressure moves the tilting table frame 3 counterclockwise through the piston 44, piston rod 43, and rotary connection part 45, that is, the table surface moves to the left. Drive to tilt in the direction.

The tilting operation of the tilting table 1 is performed by rotating the stylus operating arm 8 relative to the tilting table frame 3 using the worm 5 supported on the tilting table frame 3 as described above.
When the stylus 85 in contact with this moves to the left and the working hydraulic pressure is guided to the left working chamber of the servo power cylinder 41 and the table 1 tilts counterclockwise, the worm 5 of the ear shaft 2 along with the tilting table 1
moves, the stylus actuating arm 8 also moves counterclockwise by the same amount as the tilting amount of the tilting table 1 via the worm wheel 4 meshing with it, pushing the spool to the right (toward the neutral position). However, since the worm 5 continues to be rotated by the worm shaft handle 7 by an amount corresponding to the inclination angle α, the stylus operating arm 8 is relative to the table frame more than the amount by which the stylus operating arm 8 moves to the right due to the amount of tilting of the table frame 3. Since the amount of movement to the left is greater than the amount of movement, the stylus 85 will continue to be moved to the left. Therefore, the oil passage remains formed and the tilting table 1
will continue to perform tilting motion.

When the worm wheel 5 is rotated by an amount corresponding to the inclination angle α using the worm handle 7 and then stopped, the relative movement between the stylus actuating arm 8 and the tilting table frame 3 is stopped, so the piston 44 continues to rotate the worm wheel counterclockwise. The stylus actuating arm 8, which was rotating around the ear axis 2 together with the tilting table frame 3, moves the stylus 85 to the right, and the spool valve forming the servo control valve cylinder 50 returns to the neutral position where the supply of hydraulic oil is cut off. , the supply of pressurized hydraulic oil to the servo power cylinder is cut off, and the tilting table 1 stops tilting.

(iii) Next, the worm wheel 4 was rotated by rotating the worm shaft 6 to rotate the worm 5 by an amount corresponding to the tilt angle α and then stopped, and the tilting was stopped when the tilt angle of the tilt table 1 reached a certain value α. If the hydraulic clamp handle 60 is operated from the a position to the b position at this point, the clamp on/off valve 24 is switched so that the clamp hydraulic circuit is connected to the hydraulic source 510, that is, at this time, the hydraulic clamp circuit is connected to the hydraulic source 510→oil line 61→ Clamp on/off valve 24
→ Oil passage 62 - → Oil passage 22 → Table clamp cylinder 20 → Oil passage 23 → Worm shaft clamp cylinder 21.

And table clamp cylinder device 20,
The worm shaft clamp cylinder device 21 operates to clamp the tilt table 1 and the worm shaft 6, and the tilt table 1 is fixedly set at a desired angle.

In the present invention, after setting the tilting table to a desired tilt angle, the tilting table can be fixed by simply operating the hydraulic clamp handle 60 without using conventional bolt tightening or mechanical means. 1 to the fixed base 100, and furthermore, the worm wheel including the stylus operating arm and the worm can be immovably fixed to the tilting table side by the worm shaft clamping device 21, so the fixing and releasing work is easier than before. It is extremely quick and simple, and can improve work efficiency, and can be fixed with high precision without causing deviations in the inclination angle due to clamping.

Because the response characteristics of the servo mechanism described above have extremely high sensitivity and high speed characteristics,
While the conventional angle setting accuracy was about 10 minutes at most, this device can set the angle within 2 minutes. In other words, if we use a servo control valve 50 that senses and operates with a displacement response accuracy of 1/100 mm, and assume that the effective radius of operation of the actuating arm 8 is 200 mm, this is the rotation angle of the actuating arm 8 tan ^-1 0.01/200 = 0.17 Corresponds to a minute rotation angle. Having such high sensitivity and high speed response characteristics, the apparatus of the present invention further enables continuous cutting in which the inclination angle of the tilting table changes continuously, which was previously impossible.

Next, the operating mode of machining in which the inclination angle of the inclination table 1 is continuously changed will be explained.

First, the hydraulic clamp handle is held in position a and the hydraulic clamp system is set in the released state, which is the same as in the case of constant angle setting.

Next, the tilting operation of the tilting table can be controlled by controlling the speed of the worm shaft 6 using a known rotary drive device such as a pulse motor or the like according to a machining sequence according to a predetermined program. In this case, the stylus 85 on the servo control valve rod 51 faithfully and quickly detects the movement of the actuating arm 8 due to the rotation of the worm shaft 6, and applies a driving force to the power cylinder 41 in response to this fine angular displacement.
This causes the tilting table 1 to continuously tilt. If the servo power cylinder 41 is designed to have enough strength to withstand the load during machining, the tilt angle can be maintained reliably.

In other words, if the strength of the servo power cylinder 41 is strong enough to withstand the load during machining, the tilting table 1 should not shift due to it. Even if the table position deviates from the set angle due to distortion of the cylinder, etc., the stylus actuating arm 8 will move along with the tilting table 1 by that amount, and the stylus 85 will be moved, so the hydraulic servo control valve 50 will instantly respond and the hydraulic servo mechanism will be activated. automatically corrects the tilt table to the normal tilt angle. Since the correction at this time always operates to return the stylus to the neutral position (the position of the set angle), the set angle can be maintained with high precision.

The embodiment shown in FIG. 2 and subsequent figures is shown as an example of realizing the principle configuration shown in FIG.

In FIGS. 2 and 3, the tilting table 1
Base frames 101 and 102 are installed vertically upward on both sides of a fixed base 100 forming a fixed pedestal,
Rolling bearings 103, 103' are formed on the upper parts of the table ear shafts 2, 2' of the tilting table 1.
is rotatably supported and accommodated. Flanges 105, 105' are formed at the inner ends of the table ear shafts 2, 2', and the flanges are bolted to the legs 104, 104' hanging down on the lower surface of the inclined table. It is formed. The table ear shaft 2,,
2' is located at the bottom of the table surface and projects horizontally. The right table ear shaft 2 shown in FIG. 3 projects a little longer than the right table ear shaft 2', and there is a fan-shaped worm foil 4 on the shaft, which is a part of the important component according to the invention. The stylus operating arm 8 is rotatably fitted loosely, and these are elastically attracted to each other so as to be able to rotate integrally, and abutted and connected to each other by a foil side abutment piece 82 and an actuation arm side abutment piece 83. They are connected to each other by a tension spring 81 so as to be connected to each other by a tension spring 81 (see FIG. 2). Further, an inclined scale plate 9 for reading the approximate inclination angle of the table is integrated with the table ear shaft 2. That is, a shoulder portion 106 and a key groove 107 are formed on the right side table ear shaft 2 at positions outside the bearing 103, and a flanged sleeve 108 is fixed by key fitting. Then the flanged sleeve 108
The scale plate 9 is bolted onto the flange portion of the dial, and a pair of thrust bearings 109 are mounted on the sleeve portion of the scale plate 9.
109 and thrust rolling compound bearing 110 are inserted, and the stylus operating arm 8 and the fan-shaped worm wheel 4 are rotatably fitted in fixed positions on the table ear shaft 2.

A worm 5 is engaged with the worm wheel 4, and a handle 7 having a vernier index scale 71 for reading accurate inclination angles is fixed to the outer end of the worm shaft 6 (see Figs. 2 and 4). ). The worm shaft 6 has a rolling bearing 7 in a housing 72 fixed on the surface of the table scale plate 9.
3 and 73.

Also, the base 1 near the tip of the stylus operating arm 8
A hydraulic servo control valve unit is provided on 00, and its servo control valve cylinder 50 is fixed on a base frame 111. In FIG. 2, the axis of the servo valve rod 51 is arranged perpendicular to the swing radius of the stylus actuating arm 8, and the stylus 85 attached to the tip of the valve stem is always in contact with the tip of the actuating arm 8 against the spring force. It is constructed so that the fine movement of the actuating arm 8 is transmitted onto the stylus 85.

As mentioned above, when the servo control valve is in its neutral position, it cuts off the hydraulic pressure supply to the servo power cylinder 41, and when the servo control valve moves slightly to the left or right from its neutral position, it shuts off the hydraulic pressure to the left or right cylinder chamber of the servo power cylinder 41. An oil passage is formed and pressurized oil is supplied.
The movement of the stylus 85 at this time has a response accuracy on the order of 1/100 mm. Therefore, the movement length of the stylus can be set to about 3 mm at maximum to fully demonstrate its function. In this way, in order to limit the allowable fine movement range of the stylus 85 to a certain limit and prevent damage to the stylus, a limit pin 86 having a stopper function is installed on the base frame 111 near the stylus. By providing the restriction pin 86, for example, when the pushing speed of the actuating arm 8 connected to the worm wheel 4 toward the stylus is faster than the rotating speed of the tilting table due to rotational operation of the worm shaft 6, the actuating arm 8 is restricted. The movement of the worm 4 is stopped by the pin 86, and then for rapid rotation of the worm 4, the tension spring 81 hooked between the actuating arm 8 and the worm wheel 4 is expanded to prevent destruction of the servo control valve and the worm engagement part. To prevent.

FIG. 6 shows another modification for causing a slight displacement on the stylus 85 by the rotational movement of the stylus operating arm 8. In FIG. In this modification, the moving direction of the hydraulic servo valve rod, that is, the valve axis line, is arranged so as to coincide with the rotation center direction of the actuating arm 8, and a cam surface is formed on the periphery of the tip of the actuating arm. This cam shape has a constant radius arc surface 87 with a small turning radius, followed by a linear or curved cam surface 89 whose turning radius gradually changes greatly.
Then, following this, the entire cam surface is formed by a constant radius arc surface 88 with a large turning radius, and the radial difference between the constant small radius arc surface 87 and the constant half arc surface 88, that is, the cam surface. The effective working height S of the stylus 89 is changed in accordance with the maximum allowable movement range of the stylus 85. The neutral position of the stylus 85 is set at the center of the cam surface 89 and brought into contact with it. The large radius arc surface 88 is designed to prevent the stylus 85 from popping out due to the pushing force of the built-in spring when the rotation speed of the operating arm 8 integrated with the worm wheel 4 is faster than the rotation speed of the tilting table 1 due to the rotation operation of the worm shaft 6, for example. It is preferable to form a constant large-radius arcuate surface 88 by extending it to the left. According to such an arrangement design, the worm wheel 4 and the stylus operating arm 8 in the above-described embodiment can be integrally molded, so the above-mentioned tension spring 81 can be omitted, and the abutment piece 82, 83 and limit pin 86 can also be omitted.

Further, horizontally oriented pivot portions 42 are formed protrudingly formed on both sides of the central outer circumferential surface of the power cylinder 41 in the hydraulic servo control device. The pivot portion 42
is rotatably mounted within an ear shaft bearing 46 provided on the base frame 112, and rotatably pivots the power cylinder. A piston rod 43 for driving the tilting table is extended from the left end of the power cylinder 41, and a rotary connecting portion 45 connects the tip of the piston rod 43 with the lower side of the table frames 36, 37 hanging below the tilting table. Tilted table 1
The structure is such that the tilting movement of the device is performed smoothly.
This rotary connecting portion 45 is formed as a rotatable crosshead spanning between both leg plates 38 and 37 of the table frame, as shown in part in the center of the drawing in FIG. In FIG. 2, a leveling abutment part 91 for setting the horizontal position of the inclination table 1 is protruded near the right side of the lower surface of the back side of the inclination table 1, and an abutment stopper 92 is provided on the base 100 corresponding to this. Adjustable upright.

Finally, a hydraulic clamp system in the case where the tilting table 1 of this device is used in a fixed manner will be explained.

A clamp handle valve cylinder 25 for switching the clamp oil line system is fixed on the base 100 shown in FIG.
A clamp on/off valve 24 is housed therein. Conduit 62 connects to clamp handle valve cylinder 2
5, the reference numeral 57 indicates an oil passage conduit leading from the servo control valve cylinder to the power cylinder.

A table clamping cylinder device 20 for clamping the tilting table 1 in a fixed state is shown in FIG. The cylinder 20 has a base 100
is fixedly installed on the top and has two pistons 30 inside it,
31 is charged. The solid piston rod of the left piston 30 slidably passes through the hollow annular piston 31 of the right piston and the piston rod, and has a clamping pressure surface 32 formed at each rod end of the double piston.
33 faces both the left and right surfaces of the clamp leg plate 38 of the table frame 36 hanging below the tilting table 1. 34 is the tilting table frame 3
This is an arcuate opening formed along the periphery of the leg plate 38 of No. 6 to allow the tilting table 1 to tilt relative to the rod of the piston 30 which is in a stationary state. Thus, the double piston 3 from the supply boat 35 shown at the top of the table clamp cylinder 20
When pressurized oil is supplied to the intermediate chambers 0 and 31, the piston rod clamping pressure surfaces 32 and 33 are driven leftward and rightward, respectively, and the clamping leg plate 38 facing them is clamped from the left and right, creating a strong clamping action. In response, the tilting table 1 is fixed to the base 100 side. This clamping action applies pressure to the center rotation plane of the leg plate 38 almost equally from the left and right sides, and therefore, unlike a unilateral pressing action that involves bending, the leg plate 38 is pulled, causing stress and strain on the tilting table 1. Good results can also be obtained in precision machining of workpieces.

FIG. 4 shows the mounting structure of the worm shaft 6 in the housing 72, and a tightening ring 7 for operating the worm shaft clamp is placed at the center of the worm shaft 6.
9 is installed.

FIG. 5 is a cross-sectional view of a plane including the line V--V in FIG. 4, taken in the direction of the arrow, and shows the worm shaft hydraulic clamping device 21 that tightens or releases the tightening ring 79. Worm shaft clamp cylinder 75
is fixed on a housing 72, and a piston 76 containing a coil spring 78 for releasing tightening is inserted into the cylinder. Pressurized oil introduced from the oil hole 77 causes the piston 76 to tighten the tightening ring 79 against the coil spring 78 to clamp the worm shaft 6. Then, when the clamp hydraulic oil is released, the return force of the coil spring 78 causes the piston 76 to clamp the worm shaft 6. The worm shaft clamping action is released.

As is clear from the embodiments described above, the tilting table according to the present invention employs a hydraulic servo mechanism with excellent response characteristics, thereby reducing the load displacement of the worm engagement portion that occurs during the tilting operation of the conventional tilting table. This problem has been completely resolved and the worm shaft can be easily operated under constant rotational torque.
Improve the meshing accuracy and lifespan. Furthermore, since the worm shaft rotation and table tilting movement can be followed in a very short time, it is suitable for continuous cutting of a workpiece in which the tilting table is operated continuously.
In particular, the rotation of the worm shaft is controlled under light torque even in response to fluctuating loads that occur during cutting, and there is no unevenness in the rotational speed, so cutting can be achieved by an automatic control method according to a predetermined program.

Furthermore, by using a hydraulic clamp device, the tilting table can not only be firmly and securely fixed simply by switching the clamping on/off valve, but also this operation can be performed by sequence control.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the principle of a tilting table device according to the present invention, and FIGS. 2 to 5 show an embodiment of the present invention that realizes the configuration of FIG. 1. Fig. 2 is a side elevational view of the device including the hydraulic servomechanism parts arranged and installed on the base, Fig. 3 shows the clamping device of the tilting table with double hydraulic pistons and the shaft structure of the tilting table; Figures 4 and 5 show the detailed structure of the worm shaft hydraulic clamping device.
The figure shows an example of a modified arrangement of the actuating arm and stylus. 1... Inclined table, 2... Table ear shaft, 3
...Table frame, 4...Worm foil,
5...Worm, 6...Worm shaft, 7...Worm shaft handle, 8...Stylus operating arm, 20
... Table clamp device, 21 ... Worm shaft clamp device, 24 ... Hydraulic clamp on-off valve, 40 ... Hydraulic servo mechanism, 41 ... Power cylinder, 50 ... Hydraulic servo control valve, 510 ... Hydraulic source, 55 , 56...Pilot check valve.

Claims (1)

[Scope of Claims] 1. A tilting table is tiltably supported on a fixed base, and a worm wheel and a stylus operating arm that are integrally connected are loosely fitted on a tilting rotation axis that is integral with the tilting table, A worm shaft rotation control system comprising a worm shaft having a worm fixed thereto that meshes with the worm wheel is supported on the tilting table frame, so that the rotation of the worm shaft is controlled in accordance with a desired tilt angle required of the tilting table. The stylus actuating arm is formed to be rotatable, and a hydraulic servo mechanism system is fixed on the fixed base, and a stylus provided at the tip of a valve shaft of a hydraulic servo control valve constituting the servo mechanism system is actuated by the stylus. The hydraulic servo control valve is arranged so as to be in contact with the arm, and in response to the movement of the stylus operating arm, moves and displaces the hydraulic servo control valve from a neutral position of supply pressure oil cutoff, thereby making it possible to control the pressure oil supply to the power cylinder and the cutoff action. At the same time, one end of the power cylinder belonging to the hydraulic servomechanism system is pivotally connected to a fixed base, and a movable piston rod pivotally connected to the tilting table frame portion is slidably connected to the other side of the power cylinder. A movable tilting table, wherein the movable tilting table is inserted through the worm shaft so that the tilting motion of the tilting table corresponding to rotation control of the worm shaft can be followed. 2. In claim 1, the valve axis of the servo control valve is arranged so as to be substantially perpendicular to the radial direction of the stylus actuating arm, and is on the ear axis formed as the rotation axis of the tilting table. The worm wheel and stylus operating arm, which are formed separately and loosely fitted, are connected by a tension spring to integrate them, and a stop pin is fixed near the stylus at the end of the servo control valve to prevent excessive retraction of the stylus. 2. A movable tilting table, characterized in that the movable tilting table is configured to limit the amount of force and to prevent overloading of the worm engagement portion by the compression action of the tension spring. 3. In claim 1, the worm wheel and the stylus operating arm are arranged such that the valve axis of the servo control valve is oriented in the radial direction of the stylus operating arm, and is loosely fitted onto the lug axis of the tilting table. What is claimed is: 1. A tilting table, characterized in that the tilting table is formed as an integrally connected unit, and the stylus is brought close to a cam surface formed on the periphery of the distal end of the stylus operating arm to drive a power cylinder. 4. A tilting table is tiltably supported on a fixed base, and a worm wheel and a stylus actuating arm, which are integrally connected, are loosely fitted onto a tilting rotation shaft integral with the tilting table, and mesh with the worm wheel. A worm shaft rotation control system having a worm shaft to which a worm is fixed is carried by the tilting table frame, so that the stylus actuating arm is controlled in accordance with the rotation control of the worm shaft that corresponds to a desired tilt angle required of the tilting table. A hydraulic servo mechanism system is fixed on the fixed base, and a stylus provided at the tip of a valve shaft of a hydraulic servo control valve constituting the servo mechanism system is brought into contact with the stylus operating arm. The hydraulic servo control valve is disposed in response to the movement of the stylus operating arm to move and displace the hydraulic servo control valve from the neutral position of supply pressure oil cutoff, thereby making it possible to control the pressure oil supply and cutoff action to the power cylinder, and controlling the hydraulic servo control valve to the hydraulic servo mechanism system. One end of the power cylinder to which it belongs is pivotally mounted on a fixed base, and a movable piston rod pivotally connected to the tilting table frame portion is slidably inserted into the other side of the power cylinder, and the movable piston rod is slidably inserted into the other side of the power cylinder. A table hydraulic clamp device is installed on the fixed base to make it possible to follow the tilting movement of the tilting table corresponding to the rotation control of the tilting table, and to further clamp the tilting table to the fixed base side, and a worm shaft for fixing the worm shaft. A tilting table characterized in that a hydraulic clamp device is carried on the tilting table.