JPS6246516Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a machine tool such as a cutting machine, a metal processing machine, a die-casting machine, an injection machine, etc., and the workpiece fixing plate, mold, etc.
The present invention relates to a positioning and fixing device for a machine tool, which includes a plug-type positioning device for positioning a movable frame such as a mold fixing plate, and a clamp device for fixing the movable frame to a reference frame. Some devices of this type are equipped with a positioning device that positions a reference frame and a movable frame by driving a connector into a connector receiving hole using a compressed air cylinder, and a hydraulically driven clamp device.

The reason why the working fluids of the positioning device and the clamping device are different is that the clamping device uses a high-pressure working fluid of, for example, 140 to 250 kg/ ^cm2 , whereas the pressure of the working fluid of the positioning device is This is because, for example, a low to medium pressure of 4 to 6 kg/cm ² is sufficient. In addition, when the clamp device is accidentally activated when the stopper of the positioning device is not fitted into the stopper receiving hole, the stopper retracts without being stretched, and
This is also to prevent deformation of the movable frame caused by the tension of the fitting.

However, using two systems of pressure fluid supply and discharge devices makes the device complicated, and the control timing of both pressure fluid supply and discharge devices may be incorrect, causing the movable frame to move without being positioned with respect to the reference frame. There is a drawback that the frame is fixed to the reference frame.

In view of the above circumstances, the present invention simplifies the device by combining the pressure fluid supply and discharge device that operates the positioning device and the clamp device into one system, and also simplifies the device by combining the pressure fluid supply and discharge device that operates the positioning device and the clamp device. To prevent a clamp device from operating if the movable frame is not operated, so that the movable frame cannot be fixed to the reference frame until the movable frame is reliably positioned with respect to the reference frame.

In order to achieve this objective, the present invention basically provides a pressure fluid supply for a cylinder that drives the connector of the positioning device to enter the connector hole and a cylinder that drives the clamp claw of the clamp device toward the reference frame. They are connected in series to the pressure fluid supply and discharge passages of the exhaust device, and an on-off valve is interposed in the connection passage between both cylinders.
When the amount of entry of the fitting into the fitting receiving hole is less than a predetermined amount, the on-off valve is closed, and when the amount of entry into the fitting is more than a predetermined amount, the on-off valve is opened. The main feature is that the stopper and the valve member of the on-off valve are interlocked and connected.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a plan view of a workpiece changing device for a vertical machine tool.

This machine tool 1 consists of a vertical machining center, with a reference frame 3 fixed on a table 2.
A movable frame 5 consisting of a pair of work pallets is transferred between the movable frame 5 and a turntable 4 disposed at its front end.

In the reference frame 3, a dowel 61 and a dowel drive device 62 of a pair of positioning devices 6, and a clamp claw 71 and a clamp claw drive device 72 of six clamp devices 7 are formed in the front-rear direction and left-right direction, respectively. It has been done.

FIG. 2 is a schematic diagram of the movable frame positioning and fixing device.

Opposing surface 8 consisting of the upper surface of the reference frame 3
The movable frame 5, which faces the movable frame 5, is provided with a pair of fitting receiving holes 63 and respective clamped portions 73 each consisting of three T-shaped grooves running in the front and back on the other opposing surface 9, which is the lower surface of the movable frame 5. do.

The coupling drive device 62 is composed of a double-acting hydraulic cylinder with a vertical shaft, and a piston 66 is slidably inserted into a cylinder chamber 65 in a cylinder case 64.
In the cylinder case 64, a pressure receiving chamber 67 for driving the coupling plug to advance and a pressure receiving chamber 68 for driving the coupling plug to retract are vertically divided and formed.

The clamp claw drive device 72 is composed of a single-acting hydraulic cylinder with a vertical axis, and its cylinder case 74
A pressure receiving chamber 77 and a return spring chamber 78 are vertically divided and formed in the cylinder chamber 75 by a piston 76 slidably inserted into the cylinder chamber 75 inside. code 79
indicates a return spring.

Now, the pressure receiving chamber 67 for driving the connector advancement of the positioning device 6 is connected in series to the pressure fluid supply/discharge path 101a of the pressure fluid supply/discharge device 10 via the connection path 11a.
Each pressure receiving chamber 77 of the clamp device 7 is further connected in series to these pressure receiving chambers 67 through a connecting path 11b.

An on-off valve 12 is connected to these connecting paths 11a and 11b.
When the amount of entry of the connector 61 into the connector hole 63 is less than a predetermined amount, the on-off valve 12 is closed, and when the amount of entry is more than a predetermined amount, the on-off valve 12 is closed. The coupling valve 61 and the valve member 121 of the on-off valve 12 are interlocked and connected so that the valve can be opened.

That is, in this example, as shown in FIG.
The second valve chamber 122 is recessed in the end wall 69 of the pressure receiving chamber 67 for driving the connector advancing of the positioning device 6.
The valve member 121 consisting of a sliding valve member inserted into the piston 66 of the coupling valve drive device 62 is inserted into the piston 66 of the valve drive device 62.
The piston rod 610 is fitted onto the piston rod 610 connected to the lower surface of the piston rod.

Further, the coupling plug 61 is integrally connected to the upper surface of the piston 66.

In this way, the valve chamber 122 of the on-off valve 12 is connected to the pressure receiving chamber 67 for driving the coupling plug advancement, and the coupling plug 61 is integrated with the piston rod 610 that supports the piston 66 and the valve member 121. This is advantageous from the viewpoint of simplifying the process and reducing the number of parts, and also has the advantage that the coupling valve 61 and the valve member 121 are reliably interlocked. Incidentally, the valve member 121 is made of a commercially available O-ring.

As shown in FIG. 2, the pressure fluid supply/discharge device 10 is provided with another pressure fluid supply/discharge channel 101b in addition to the pressure fluid supply/discharge channel 101a connected to the pressure receiving chamber 67 for driving the coupling plug advancement. This pressure fluid supply/discharge path 101b is connected to a pressure receiving chamber 68 for driving in and out. And two pressure fluid supply and discharge passages 101a,
101b is connected to the pressure oil passage 10 via the supply/discharge switching valve 102.
3 is alternatively connected. Here, the pressure fluid supply/discharge path that is not connected to the pressure oil path 103 is the drain path 10.
Connected to 4. The pressure oil passage 103 includes an oil pump 1.
05 is connected and the supply/discharge switching valve 102 is switched between two positions, an operating position and an operating release position.
In the operating position, the pressure fluid supply/discharge path 1 is connected from the pressure oil path 103.
01a, pressure oil is supplied to the pressure receiving chamber 67 for driving the coupling plug advancement through the connecting path 11a, and further to the pressure receiving chamber 77 of the clamping device 7 through the connecting path 11b (see Fig. 2), and in the deactivation position. Pressure fluid supply/discharge path 101
The configuration is such that pressurized oil is supplied to the pressure receiving chamber 68 for driving the coupling plug in and out through b.

Reference numeral 106 indicates an oil reservoir, and 107 indicates a compressed air supply device for driving the pump.

As shown in FIG. 3, inside the piston rod 610, a pressure receiving chamber 67 for driving the mating plug to advance is connected from the pressure receiving chamber 77 of the clamp device 7 to the pressure receiving chamber 67 for driving the mating plug to advance.
A check valve 13 is incorporated to allow the inflow of pressurized oil into the pressure vessel 11.

That is, a reverse flow path 131 is formed that communicates from the bottom surface of the piston rod 610 to the outer circumferential surface of its base end.
A check valve chamber 132 is provided in the middle, and a check valve 133 and a valve closing spring 134 are inserted into the check valve chamber 132.

Next, the operation of the above embodiment will be explained.

First, the movable frame 5 is positioned at a predetermined position on the reference frame 3 in the front-back direction and the left-right direction.

As shown in FIG. 2, when the supply/discharge switching valve 102 is set to the operating position, the pressure receiving chamber 67 for driving the coupling valve advance is connected to the pressure oil passage 103 via the pressure fluid supply/discharge passage 101a and the connection passage 11a. , pressure fluid supply and discharge device 10
Pressure oil starts to be supplied to the pressure receiving chamber 67 for driving the coupling plug in and out, and the pressure receiving chamber 68 for driving the coupling plug in and out is connected to the drain passage 104 via the pressure fluid supply/discharge passage 101b and is depressurized.

By supplying the pressure oil, the piston 66 and the dowel 61 are driven to move forward, and when the amount of intrusion of the dowel 61 exceeds a predetermined amount and the positioning operation of the positioning device 6 begins, the on-off valve 12 opens. As a result, the pressure receiving chamber 67 for driving the coupling valve advance is the valve chamber 122 of the on-off valve 12,
Pressure receiving chamber 7 of clamp device 7 via connection path 11b
7, and pressurized oil is supplied from the pressure receiving chamber 67 for driving the coupling plug advancement to the pressure receiving chamber 77 of the clamp device 7.

Next, when the supply/discharge switching valve 102 is switched from the operating position to the deactivating position, the pressure receiving chamber 6 for driving the coupling plug in and out
8 is connected to the pressure oil passage 10 via the pressure fluid supply and discharge passage 101b.
The pressure receiving chamber 77 of the clamp device 7, the valve chamber 122 of the on-off valve 12, and the pressure receiving chamber 67 for driving the coupling valve advance are connected to the connecting passages 11a, 11b and the pressure fluid supply/discharge passage 101a. It is connected to the drain path 104 and is depressurized.

That is, when the pressure receiving chamber 68 on the left side of FIG.
2. The pressure passes through the check valve 13 and the pressure receiving chamber 67 for driving the connecting plug to advance, and is discharged from the right pressure receiving chamber 67 for driving the connecting plug to the drain path 104 via the connecting path 11a.

The pressure receiving chamber 67 for driving the right connector advancing is exhausted to the drain passage 104 through the pressure fluid supply/discharge passage 101a and the supply/discharge switching valve 102. As a result, the coupling plug 61 exits from the coupling cap receiving hole 63, and the operation of the positioning device 6 is released.

At the same time, in the clamp device 7, the piston 76 is pushed up by the return spring 79, and the pressure oil in the pressure receiving chamber 77 of the clamp device 7 passes through the connection path 11b to the valve chamber 122 of the left on-off valve 12, the check valve 1
3. After passing through the pressure receiving chamber 67 for driving the connector advancement,
The connection path 11a leads to the positioning device 6 on the right side, and the valve chamber 122 of the on-off valve 12, the check valve 13,
The drain passage 1 is connected to the drain passage 1 through the pressure receiving chamber 67 for driving the coupling plug to advance.
04 to the oil storage tank 106.

As a result, the pressure oil is removed from the pressure receiving chamber 77 of the clamp device 7, and the movable frame fixing operation of the clamp device 7 is released.

FIG. 4 is a longitudinal cross-sectional view of a modification of the above-mentioned plug drive device.

This coupling drive device 62' first starts with the piston 6.
The valve member 121 of the on-off valve 12 is slidably fitted into the lower part of the opening/closing valve 6 , is urged to advance by a valve closing spring 123 , and is prevented from advancing beyond a certain level by a stopper 124 . Configure. Further, a valve member 121 is attached to the end wall 69 of the pressure receiving chamber 67.
An annular valve seat 125 is provided which is moved toward and away from the valve seat 125, and the connecting passage 11 is opened within the valve seat 125. In this case, since the on-off valve 12 also functions as a check valve, the check valve 13 shown in FIGS. 2 and 3 is omitted. The rest of the structure of this example is the same as that shown in FIG. 3, so corresponding parts are given the same reference numerals.

With this configuration, when the supply/discharge switching valve 102 is set to the operating position, the piston 66 and the coupling valve 61 are advanced by the pressure oil supplied from the pressure fluid supply/discharge path 101a to the pressure receiving chamber 67 for driving coupling coupling advancement. However, since the valve member 121 is urged by the valve closing spring 123, it does not move away from the valve seat 125 at first, and the on-off valve 12 is closed. Thereafter, when the piston 66 and the coupling plug 61 are driven to advance to a predetermined position, the valve member 121 is lifted by the stopper 124 and the on-off valve 12 is opened.

Further, when the supply/discharge switching valve 102 is switched from the operating position to the deactivating position, the pressure receiving chamber 77 of the clamp device 7 is
It is connected to the pressure fluid supply/discharge path 101a through the pressure fluid supply/discharge path 101a, and is depressurized. At this time, the pressure receiving chamber 68 for driving the plug in and out
Even if the piston 66 and the stopper 61 are sufficiently retracted by the pressure oil supplied inside the clamping device 7
Since the force of the return spring 79 of 7 is stronger than the force of the valve closing spring 123, the force of the return spring 79 pushes up the piston 76, and the pressure oil in the pressure receiving chamber 77 of the clamp device 7 causes the valve member 121 to close to the valve closing spring 123. Lift up against it,
Open the on-off valve 12. As a result, pressure oil is removed from the pressure receiving chamber 77 of the clamping device 7, and the clamping device 7
The movable frame fixing operation is released.

Other functions are essentially the same as those shown in FIG.

FIG. 5 is a schematic diagram of another embodiment of the present invention, in which one positioning device 6 and one clamping device 7 are shown to simplify the explanation.
Here, when providing a plurality of positioning devices 6,
By connecting these pressure receiving chambers 67 for advancing the coupling plugs in series, supply of pressure oil to the clamp device 7 is started only after the positioning operations of all the positioning devices 6 have been performed.

Now, in this example, the pressure oil passage 103 and the drain passage 104 of the pressure fluid supply and discharge device 10 are each branched into two from the middle, and the two supply and discharge switching valves 102
A pressure oil passage 103 and a drain passage 104 are connected to a and 102b, respectively. One supply/discharge switching valve 102a is connected to the pressure receiving chamber 67 for driving the coupling plug of the positioning device 6 via the pressure fluid supply/discharge path 101a, and the other supply/discharge switching valve 102b is connected to the pressure fluid supply/discharge path 101.
It is connected to a pressure receiving chamber 68 for driving the plug in and out through b.

Each supply/discharge switching valve 102a, 102b is constituted by an electromagnetically operated valve, and is controlled by a control device 14 to switch between two positions.

This control device 14 includes a power supply device 141, a switch 142, and a delay device 143. switch 1
42 to the operating position (as shown in the figure), one of the supply/discharge switching valves 102a is switched to the pressure fluid supply position, and the pressure oil passage 103 is connected to the pressure receiving chamber 67 for driving the connector advancing. The other supply/discharge switching valve 102
b is switched to the pressure fluid discharge position, and the pressure receiving chamber 68 for driving the coupling plug in and out is connected to the drain path 104.
When the switch 142 is switched to the deactivation position, the one supply/discharge switching valve 102a is switched to the drain position, the pressure receiving chamber 67 for driving the coupling valve advance is connected to the drain path 104, and the pressure oil path 103 is connected to the pressure fluid path 103. The other supply/discharge switching valve 10 switched to the supply position
2b, it is connected to a pressure receiving chamber 68 for driving the coupling plug in and out. The switching of the other supply/discharge switching valve 102b from the pressure fluid discharge position to the pressure fluid supply position is as follows:
Due to the start delay action of the delay device 143, the switching from the pressure fluid supply position to the pressure fluid discharge position of the one supply/discharge switching valve 102a is delayed by a predetermined time, and the switching from the pressure receiving chamber 77 of the clamp device 7 is performed. After the pressure oil is discharged, the piston 66 descends and the on-off valve 12 is closed.

Except for omitting the check valve in the piston rod 610, the other configurations of this example are as shown in FIGS. 1 to 3.
Since the configuration is similar to that shown in the figure, the fifth
In the drawings, parts corresponding to those in the embodiment shown in FIGS. 1 to 3 are given the same reference numerals.

This example configured in this manner essentially has the same effect as that shown in FIGS. 1 to 3.

In each of the embodiments described above, a hydraulic cylinder is used to drive the coupling plug in and out, but instead of this, a spring may be used to drive the coupling plug in and out.

In this case, there is an advantage that the pressure fluid supply/discharge path 101b can be omitted and the structure can be made simpler.

FIG. 6 shows another embodiment of the present invention, in which the coupling plug drive device 62 of the positioning device 6 is constituted by a double-acting cylinder, and the coupling plug 61 connected to the piston 66 is driven by the piston rod. 610, the pressure receiving area on the pressure receiving chamber 67 side for driving the piston 66 to advance the connecting plug is formed larger than the pressure receiving area of the pressure receiving chamber 68 for driving the connecting plug to retract, and the above-mentioned connecting plug The pressure receiving chamber 67 for advancing drive is connected to the pressure oil passage 103 of the pressure fluid supply device 10 via the supply/discharge switching valve 102c and the pressure fluid supply/discharge path 101a, and the pressure receiving chamber 68 for driving the coupling plug in and out is connected to the pressure oil passage 103 of the pressure fluid supply device 10. is directly connected to another pressure fluid supply/discharge path 101b branched from the pressure oil path 103.

The rest of the structure is similar to the embodiment shown in FIGS. 1 to 3.

With this configuration, when the supply/discharge switching valve 102c is switched to the pressure oil supply position, the coupling 61 is driven to advance due to the differential pressure that the piston 66 receives from both pressure receiving chambers 67, 68 of the coupling plug drive device 62, and the supply/discharge is started. Switching valve 102
When c is switched to the pressure oil discharge position, both pressure receiving chambers 6
Due to the differential pressure that the piston 66 receives from 7 and 68, the joint stopper 6
1 will be driven in and out.

If the structures of the supply/discharge switching valve 102 in FIG. 2 and the supply/discharge switching valve 102c in FIG. 6 are compared, it will be easily understood that the latter is simpler.

As explained above, the present invention allows the cylinder that drives the connector of the positioning device to enter the connector hole and the cylinder that drives the clamp claw of the clamp device toward the reference frame to operate under the pressure of the pressure fluid supply and discharge device. They are connected in series to the fluid supply and discharge passages, and an on-off valve is interposed in the connection path between both cylinders, and the on-off valve closes when the amount of the above-mentioned coupling plug entering the coupling-cap receiving hole is less than a predetermined amount. The coupling valve and the valve member of the on-off valve are interlocked and connected so that the on-off valve is opened when the amount of inflow exceeds a predetermined amount.
You can get the effect of

That is, the working fluid for driving the positioning device A and the working fluid for driving the clamping device are integrated into one system, which simplifies the circuit configuration.

B The on-off valve is linked with the joint stopper so that pressure fluid is not supplied to the clamp device until positioning by the joint stopper has been effectively performed, so the movable frame can be moved to the reference frame without positioning. Fixed malfunctions can be completely prevented.

C In addition, the opening/closing valve is linked with the joint stopper so that pressure fluid is not supplied to the clamp device until positioning by the joint stopper has been effectively performed, so that the joint stopper is connected to the movable frame and the reference frame. It is possible to prevent the movable frame and the reference frame from being deformed or damaged due to the clamping device operating in a stretched state between them.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a plan view of a workpiece changing device for a machine tool, and FIG.
The figure is a schematic diagram of the movable frame positioning and fixing device.
FIG. 3 is a longitudinal cross-sectional view of the coupling plug drive device. FIG. 4 is a longitudinal cross-sectional view of a modification of the above coupling drive device, FIG. 5 is a schematic diagram of another embodiment of the present invention, and FIG. 6 is a schematic diagram of another embodiment of the present invention. be. 1... Machine tool, 3... Reference frame, 5... Movable frame, 6... Positioning device, 61... Coupling, 62,
62'...Coupling drive device, 63...Couple receiving hole, 6
4...Cylinder case, 65...Cylinder chamber, 6
6...Piston, 67...Pressure receiving chamber for driving the coupling plug in and out, 68...Pressure receiving chamber for driving the coupling plug in and out, 69...
End wall, 610... Piston rod, 7... Clamp device, 71... Clamp claw, 72... Clamp claw drive device, 73... Clamped portion, 77... Pressure receiving chamber, 8, 9... Opposing surface, 10 ... Pressure fluid supply and discharge device, 101a, 101b ... Pressure fluid supply and discharge path,
102, 102a, 102b, 102c...Supply/discharge switching valve, 11a, 11b...Connection path, 12...Opening/closing valve, 121...Valve member, 122...Valve chamber, 12
3...Valve closing spring, 125...Valve seat, 13...Check valve, 131...Reverse flow path, 132...Check valve chamber, 1
33... Valve member, 134... Valve closing spring, 14...
Control circuit, 143...Delay device.

Claims (1)

[Claims for Utility Model Registration] 1. A plug-type positioning device 6 for positioning the movable frame 5 with respect to the reference frame 3 of the machine tool 1, and a clamp device for fixing the movable frame 5 to the reference frame 3. 7, the positioning device 6 includes a reference frame 3 and a movable frame 5.
A plug receiving hole 63 recessed in one side of each opposing surface facing each other, and a plug receiving hole 61 recessed from the other side.
a coupling stopper 61 that is moved in and out of the coupling stopper 61; a coupling stopper driving device 62 that drives the coupling stopper 61 forward and backward into the coupling stopper receiving hole 63;
62', and the connecting plug drive device 62, 62' has a connecting plug 6
The clamp device 7 includes a clamp claw 71 that faces the reference frame 3 across the clamped portions 73 and 73 of the movable frame 5, and a clamp claw 71 that moves the clamp claw 71 to the reference frame 3. The clamp claw drive device 72 is provided with a cylinder that drives the clamp claw 71 toward the reference frame 3 side, and the pressure fluid supply/discharge device 10 has a clamp claw drive device 72 that moves forward and backward. Drainage path 10
1a, a pressure receiving chamber 67 of the cylinder of the positioning device 6 and a pressure receiving chamber 7 of the cylinder of the clamping device 7.
7 in series and both pressure receiving chambers 67, 7.
An on-off valve 12 is interposed in the connection path 11a, 11b between 7, and the on-off valve 12 is closed when the amount of entry of the fitting plug 61 into the fitting hole 63 is less than a predetermined amount. The connecting valve 6 is arranged so that the on-off valve 12 is opened when the amount is more than a predetermined amount.
1 and a valve member 121 of an on-off valve 12 are interlocked and connected. A movable frame positioning and fixing device for a machine tool. 2. In the movable frame positioning and fixing device for a machine tool described in claim 1 of the utility model registration claim, a piston 66 is inserted into the cylinder chamber 65 in the cylinder case 64 of the cylinder of the positioning device 6 so as to be movable forward and backward. The cylinder chamber 65 is divided by a piston 66 to form a pressure receiving chamber 67 for driving the coupling plug to advance, and a valve chamber 122 of the on-off valve 12 is recessed in an end wall 69 of the pressure receiving chamber 67 facing the piston 66. The valve member 121 inserted into the valve chamber 122 is interlocked and connected to the connecting plug 61 via the piston 66. 3. In the movable frame positioning and fixing device for a machine tool described in claim 2 of the utility model registration claim, the valve member 121 slides into contact with the peripheral wall of the valve chamber 122 to move in and out from the valve chamber 122 into the pressure receiving chamber 67. It is composed of a sliding valve member. 4. In the movable frame positioning and fixing device for a machine tool described in any one of claims 1 to 3 of the claims for utility model registration, the opening/closing valve 12 is provided in the connecting paths 11a and 11b.
A check valve 13 is interposed in parallel with the clamping device 7 to allow pressure fluid to flow into the positioning device 6. 5. In the movable frame positioning and fixing device for a machine tool described in claim 4 of the utility model registration claim, a piston 66 is inserted into the cylinder chamber 65 in the cylinder case 64 of the cylinder of the positioning device 6 so as to be movable forward and backward. The cylinder chamber 65 is divided by a piston 66 to form a pressure receiving chamber 67 for driving the coupling plug to advance, and a valve chamber 122 of the on-off valve 12 is recessed in an end wall 69 of the pressure receiving chamber 67 facing the piston 66. Then, a valve member 121 made of a sliding valve member inserted into this valve chamber 122 is interlocked and connected to the coupling valve 61 via a piston 66, and a backflow passage 131 and a valve chamber of the check valve 13 are provided inside the valve member 121. 132, and
A valve member 133 of a check valve 13 and a valve closing spring 134 are inserted into the valve chamber 132. 6 In the movable frame positioning and fixing device for a machine tool described in claim 1 of the utility model registration claim, a piston 66 is inserted into the cylinder chamber 65 in the cylinder case 64 of the cylinder of the positioning device 6 so as to be movable forward and backward. , the cylinder chamber 65 is divided by a piston 66 to form a pressure receiving chamber 67 for driving the coupling plug to advance, and the connecting passages 11a and 11b are opened in an end wall 69 of the pressure receiving chamber 67 facing the piston 66; A valve seat 125 of the on-off valve 12 is formed around the openings of the connection paths 11a and 11b, and the piston 66 supports the valve member 121 of the on-off valve 12 so as to be movable forward and backward over a predetermined stroke. 121 toward the valve seat 125.
and the piston 66. 7 In the movable frame positioning and fixing device for a machine tool described in any one of claims 1 to 6 of the claims for utility model registration, the coupling drive device 62, 6 of the positioning device 6
2' is equipped with a spring for driving the plug in and out. 8. In the movable frame positioning and fixing device for a machine tool described in any one of claims 1 to 6 of the claims for utility model registration, the coupling drive device 62, 6 of the positioning device 6
2' is a double-acting cylinder equipped with a pressure receiving chamber 67 for driving the coupling plug to advance and a pressure receiving chamber 68 for driving the coupling plug to retract, and a pressure fluid supply connected to the pressure receiving chamber 67 for driving the coupling plug to advance. Electromagnetically operated supply/discharge switching valves 102a, 102 are provided in the discharge passage 101a and the pressure fluid supply/discharge passage 101b connected to the pressure receiving chamber 68 for driving the plug in and out, respectively.
A control circuit 14 is provided for controlling the switching of both supply and discharge switching valves 102a and 102b, and this control circuit 14 includes a supply and discharge switching valve that is connected to a pressure receiving chamber 67 for driving the connector advancing. After sending a discharge command to switch the valve 102a to the pressure fluid discharge position to the supply/discharge switching valve 102a, the clamp device 7 is operated to discharge the pressure fluid from the pressure receiving chamber 77 of the clamp device 7, and then the valve 102a is operated to discharge the pressure fluid from the pressure receiving chamber 77 of the clamp device 7. A delay circuit 143 is provided to send a supply command to switch the supply/discharge switching valve 102b connected to the pressure receiving chamber 68 from the pressure fluid discharge position to the pressure fluid supply position. 9 In the movable frame positioning and fixing device for a machine tool described in any one of claims 1 to 6 of the claims for utility model registration, the coupling drive device 62, 6 of the positioning device 6
2' is composed of a double-acting cylinder equipped with a pressure receiving chamber 67 for driving the connecting plug to advance and a pressure receiving chamber 68 for driving the connecting plug to retract. 102 and a pressure fluid supply/discharge path 101a, it is connected to the pressure oil path 103 of the pressure fluid supply/discharge device 10, and the pressure receiving chamber 68 for driving the coupling plug in and out is connected via another pressure fluid supply/discharge path 101b. The pressure receiving area of the piston 66 of the connecting plug drive device 62 on the side of the pressure receiving chamber 67 for driving the connecting plug to advance is larger than the pressure receiving area of the pressure receiving chamber 68 for driving the connecting plug to retract.