JPS5914122Y2 - positioning device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a positioning device using a locating pin.
In particular, the present invention relates to a positioning device that can eliminate positioning errors that occur in gaps around the outer periphery of location I pins.

A positioning device using a locate pin has the advantage of a simple structure, but since it is necessary to install the locate pin so that it can be moved in and out, there is a gap between the hole that supports it and the outer periphery of the locate pin. do.

This gap makes the diameter of the locate pin 10 to 100 mm.
In this case, the maximum value is about 36 to 70 μ according to H7h7 of the JIS fitting standard.

This gap causes positioning errors, and it is extremely difficult to process the gap to minimize it.
Even if it were processed in this way, it would be necessary to provide a fairly large gap in order to engage the locating pin so that it can move in and out.

Therefore, it has a drawback that it is not suitable as a positioning device that requires accurate positioning.

In order to solve the above-mentioned drawbacks, the present invention is designed to hold and support the locating pin with virtually no gap, and to provide a gap only when the locating pin is moved in and out, thereby achieving extremely accurate positioning. The object of the present invention is to provide a positioning device capable of performing the same operations.

1 to 5 showing one embodiment of the present invention will be described below.

In FIG. 1, reference numeral 1 denotes a bed 2, which is a rotary table mounted on the bed 1. As shown in FIG.

Reference numeral 3 designates a member to be positioned such as a pallet (hereinafter referred to as a pallet) that is replaceably placed on the rotary table 2 , and 4 represents a clamper provided on the rotary table 2 .

The clamper 4 has four pistons 5 as shown in FIG.
It is supported on the rotary table 2 so as to be able to move up and down.

These pistons 5 are composed of a first piston, a second piston, a third piston 5b, and a third piston 5C, as shown in detail in FIG.
It has a stepped piston, each with two rotary tables.
They are slidably inserted into independent cylinders 6a, 6b, and 6C provided in the chambers, and are slightly pushed upward by pressure oil supplied from the channel 7 to the chambers 8a, 8b, and 8C.

The chambers 9b and 9C on the opposite side of the second and third pistons 5b and 5C have a through hole 10b and an annular groove 11. It is opened to the atmosphere through a through hole 12.

A strong spring 13 such as a spring spring is provided between the piston 5 and the rotary table 2, and the chambers 8a, 8
b. When pressure oil is not supplied to 8C, the piston 5 is pressed downward with a strong force.

Note that the chambers containing this spring 13 are also the chambers 9b and 9C.
Needless to say, it is also open to the atmosphere.

The clamper 4 is fixed to the rod 14 of the piston 5.

The clamper 4 has a side surface 4a that slidably engages the guide 16 of the pallet 1-3.

Further, a protrusion 17 is provided on the side surface 4a at a position close to the piston 5, and a guide piece 18 is fixedly provided on the rotary table 2 in correspondence with the protrusion 17. It is designed to be clamped from below.

As shown in FIGS. 1, 2 and 4, a drive key 19 is fixedly installed on the lower surface of the pallets 1 to 3 in parallel with the guide 16.

On the other hand, a reference pad 20 is provided on the rotary table 2 and is slidable on one side of the drive key 19.

This reference pad 20 is installed so that when the rotary table 2 rotates in the direction of arrow A, it comes into contact with the left side surface of the drive key 19 in each figure and can receive the load accompanying the rotation. ing.

A pressing member 21 such as a roller is installed opposite to the reference pad 20 so as to come into contact with the other side surface of the drive key 19 .

As shown in detail in FIG. 4, this clamping member 21 is attached to a shaft 23 slidably provided on a reference pad stand 22, and is pressed against the reference pad 20 by a strong spring 24 such as a counter spring. has been granted.

Further, a stopper 25 is provided on the rotary table 2, as shown in FIGS. 1 and 2, which comes into contact with the tip of the drive key 19.

As shown in detail in FIG. 5, a locate pin 30 is provided at the center of the rotary table 2 so as to be slidable in the axial direction by a piston 31.

The tip of the locate pin 30 is tapered 30a,
It can be engaged with a tapered hole 32 provided in the pallet 3.

Rotary table 2 that holds and supports the locate pin 30
A cylindrical body 34 is fitted into a part of the hole 33. The tip of the cylindrical body 34 has a plurality of slits 35 extending in the axial direction at equal intervals and has a tapered outer periphery.

A presser metal 36 is attached to engage this tapered portion.

Here, the inner diameter of the cylindrical body 34, including the tip formed with a slit, is processed to a size that allows the locate pin 30 to be slidably engaged, but the inner diameter of the tip is reduced by the presser metal 36. As a result, the locating pin 30 is held together substantially without any gaps.

The portion of the pusher 36 that engages with the cylindrical body 34 has a relatively thin collar shape that can be elastically deformed in the vertical direction in FIG. 5, and an annular piston 37 is engaged below the collar.

The annular piston 37 has an annular protrusion 37 that abuts near the inner peripheral end of the collar 36 a of the pusher 36 .
A is provided.

The lower chamber 38 of the annular piston 37 is connected to the piston 31.
A flow path 40 provided in the cylinder block 39 and a flow path 41 provided in the piston 31 engage the cylinder block 39 and the piston 31 . It is connected to a supply/discharge device (not shown) that supplies and discharges pressure oil via a joint 42 and a flow path 43.

Next, the operation of this device will be explained.

Prior to carrying in the pallet 3, pressure oil is supplied to the chambers 8a, 8b, and 8C of the piston 5 of the clamper 4, and the clamper 4 is pushed up against the spring 13 to be in an unclamped state.

In this state, the pallet 3 is inserted from above to the position shown in FIG.

The pallet 3 is initially placed on the upper surface of the clamper 4 and on the guide 1.
6 and the side surface 4a of the clamper 4, the guide recess 6 is inserted into the guide piece 18 and is supported by the guide piece 18, and the guide 16 is inserted between the guide piece 18 and the protrusion 17. The sample is fed through the rotary table 2 onto the rotary table 2.

When the pallet 3 approaches the predetermined installation position shown in FIG.
The drive key 19 comes to engage with the reference pad 20, and then a clamping member 2 is attached to the other side of the drive key 19.
1 abuts against each other, and the force of the spring 24 presses the drive key 19 against the reference pad 20.

When the pallet 3 is further fed, the tip of the drive key 19 finally comes into contact with the stopper 25, and the movement of the pallet 3 is stopped.

Next, flow paths 40, 41 . shown in FIG. joint 42,
Pressure oil is supplied to the chamber 38 below the annular piston 37 via the flow path 43 .

Due to this pressure oil, the annular piston 37 is slightly pushed upward in FIG.
The inner periphery of the image is shaped upward.

Due to this deformation, the tip of the cylindrical body 34 opens by its own elastic force, allowing the locating pin 30 to move in and out.

Then, the pressure is supplied to the lower chamber 44 of the piston 31, the locate pin 30 is raised, and the tapered part 30 at the tip of the locate pin 30 is raised.
a into the tapered hole 32 of the pallet 3.

The engagement between the location I pin 30 and the tapered hole 32 is performed so as not to be restricted by the stopper 25 described above, that is, the drive key 19 is moved slightly away from the stopper 25.

Next, when the supply of pressure oil to the chamber 38 is cut off and the chamber 38 is opened to the atmosphere, the collar 36a of the pusher 36 presses down the annular piston 37 with its own elastic force and returns to its original state. , the diameter of the tip of the cylindrical body 34 is reduced.

By reducing the diameter of the cylindrical body 34, the gap around the outer periphery of the locating pin 3C is removed, and thereafter, due to the rigidity of the cylindrical body 34 and the presser metal 36, the locating pin 30 is moved in the radial direction 3,
It is accurately and reliably held at a predetermined position on the rotary table 2 without wobbling.

Therefore, the pallet 3 is positioned extremely accurately by the locate pin 30 and the reference pad 20.

Once the pallet 3 has been positioned in this way, the supply of pressure oil to the chambers 8a, 8b, 8C of the piston 5 of the clamper 4 is cut off, and the chambers 8a, 8b, 8C are opened to the atmosphere. 13, and the force id 16 of the pallet 3 is pushed down by the protrusion 17 with a force 41
Pressing on the piece 18 fixes the pallet 3 to the rotating table 2.

Next, the rotary table 2 is rotated and work begins, such as processing the workpieces (not shown) on the pallet 3.
As described above, the pallet 3 is reliably held at a predetermined position against a load by the locate pin 30 which is held at a predetermined position and the reference pad 20 which is fixedly provided on the rotary table 2.

FIG. 6 shows another embodiment of the present invention, in which the cylindrical body 34
An outer circumferential groove 50 is provided on the outer periphery of the central part of a, an annular groove is formed on the inner circumferential surface, and oil chambers 51 and 52 are provided between the groove provided on the inner circumferential surface and the outer circumferential surface of the locate pin. .52
The inner diameter of the land 53 between the locating pins 30 is pre-processed to a dimension that engages with the outer periphery of the locating pin 30 with virtually no gap, and by supplying pressure oil to the oil chambers 51 and 52, the portion of the land 53 can be removed. It is enlarged so that the location I pin 30 can be moved in and out easily.

It goes without saying that various methods can be adopted as specific means for maintaining and supporting the space between the locating pin 30 and the locating pin 30 in a variable manner.

As described above, according to the present invention, the locating pin can be smoothly moved in and out, and at the same time, the locating pins can be held with virtually no gaps, so extremely accurate positioning can be achieved.
Further, there is no need to increase the machining accuracy of the locate pin and the hole that holds and supports it so that machining and assembly are easy.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of a positioning device to which the present invention is applied, Fig. 2 is a plan view of Fig. 1, Fig. 3 is an enlarged sectional view taken along line II-III of Fig. 2, Figure 4 is an enlarged sectional view taken along line I■-■■ in Figure 2, and Figure 5 is an enlarged cross-sectional view taken along line I■-■■ in Figure 2.
FIG. 6 is an enlarged sectional view taken along the V line and shows another embodiment of the present invention. 1...Bed, 2...Rotary table,
3... Positioned member, 4... Clamper, 5, 31... Piston, 13.24...
...Spring, 16...Guide, 17...
・Protrusion, 18...Guide piece, 19...
Drive key, 20...Reference pad, 21...
...Press member, 25...Stopper, 30.
...locating pin, 32...tapered hole,
33... Hole, 34, 34 a... Cylindrical body, 35... Surin l ~, 36... Push metal, 36 a...・Brim portion, 37... Annular piston, 38° 51, 52... Oil chamber, 53
······land.

Claims (1)

[Scope of Claim for Utility Model Registration] In a rotary table for a vertical lathe having a removable pallet on which a workpiece can be mounted, the rotary table is mounted on the rotary table so as to be able to engage with the pallet and clamp the pallet. It is attached to a clamp plate provided with a hole and a guide hole provided in the center of the rotary table,
a cylindrical body with slit grooves equally spaced in the axial direction on its tip and a tapered tip, and a taper that is fixed to the upper surface of the center of the rotary table and engages with the tapered part of the cylindrical body. A pusher whose surface is molded inside the collar, an annular piston that is guided by a cylindrical body and fits into the collar of the pusher so as to be able to abut, and an oil passage that supplies pressure oil from below the piston. a locating pin that is movably inserted along the inner surface of the cylindrical body and has a tapered tip that engages with a tapered hole provided in the center of the pallet; and a hydraulic clamp that raises and lowers the locating pin. A positioning device consisting of.