JPH0513478Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an indexing positioning device, and more particularly to an indexing and positioning device that improves the indexing accuracy of a main spindle in a machine tool.

[Technical background of the case and its problems]

Conventionally, when indexing the main spindle of a machine tool, a rack and pinion type or pin type was used and positioning was performed by mutual meshing.

However, since the swing fulcrum of the swing arm, which is equipped with a rack or pin, has a pivot attached to the pivot hole, errors caused by this spacing affect indexing accuracy, making it impossible to perform index positioning with high precision. The current situation is that there is a problem.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned problems.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an indexing and positioning device that maintains high indexing accuracy of the main shaft and the like.

[Means for solving problems]

In order to achieve the above object, the present invention provides a swinging arm having an indexing engagement part provided on a rotatable or reciprocating indexed member and a removable locking part on the lower surface of the tip side. an indexing positioning device in which a recess is formed on the upper side of a pivot hole of a swing arm relative to the pivot, and a recess is formed on both sides of the recess. A swinging arm is pivotally supported on the pivot shaft at two corner portions, and the swinging arm is elastically biased toward the indexed member.

〔Example〕

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

For example, FIGS. 5 and 6 show a 4-axis controlled vertical turning center according to the present invention, in which a column 3 that is movable in the X-axis direction (horizontal direction in FIG. 5) is mounted on the top surface of the machine base 1. It is provided through.

A saddle 7 that is movable in the Z-axis direction (up and down in FIG. 5) supports a tool rest 11 on the column 3 via a slide 9.

Note that the slide 9 is movable in the Y-axis direction (left-right direction in FIG. 6) using the saddle 7 as a guide.

Furthermore, the workpiece W is installed upright on the front side wall of the machine stand 1.
A headstock 15 equipped with a chuck 13 that rotates while holding the shaft is mounted.

This headstock 15 has an indexing positioning device 19 at one end of the main shaft 17 which supports the chuck 13 and rotates.
It is configured by installing.

Next, the embodiment of the indexing and positioning device 19 according to the present invention shown in FIGS. 1 to 3 will be described in more detail.

The swinging arm 25 is equipped with a rack 23 on the lower surface of the tip side that serves as a locking portion that removably engages with a pinion 21, which is a rotatable indexed member fixed to one end of the main shaft 17. It is swingably supported on a pivot 31 provided on a bracket 29 fixed to a frame 27 of the holder.

This pivot 31 is attached to the bracket 29 by a set screw 33.
After the swing arm 25 is inserted, a locking ring 35 prevents the swing arm 25 from coming off.

As shown in FIG. 3, a curved or square-shaped recess 39 is provided on the load side (upper side in FIG. 3) of the pivot hole 37 provided in the swing arm 25, and both ends A of the recess 39 are provided on the pivot shaft 31. It is formed so that the corners (corners) are in contact with each other.

A pressing device 41 is provided on the distal end side (left side in FIG. 1) of the swing arm 25 to elastically urge the arm 25 toward the pinion 21 side. Its structure is such that a plunger 45 is movably mounted in a hole 43 provided in a bracket 29.

This effect is achieved by connecting the flange 49 to the upper part of the hole 43 (upper side in FIG. 1) to which the oil pipe 47 is connected.
is stuck, and the pressure oil sent from a hydraulic source (not shown) is
The plunger 45 is made to protrude.

Swinging arm 25 in contact with this plunger 45
swings counterclockwise about the pivot shaft 31 as a swing fulcrum, and the rack 23 and pinion 21 can be tightly engaged.

In addition, plunger 45 is installed to prevent oil leakage.
An O-ring 51 is attached to the flange 49.

Next, when the hydraulic pressure is switched and discharged, the swinging arm 25
The spring 53 that is in contact with the rear end side (the right side in FIG. 1) is attached to the bracket 29 by the push bolt 5.
5, the swinging arm 25 swings clockwise due to the resilient force (the position indicated by the chain line in the figure).

This action releases the engagement between the rack 23 and the pinion 21, and the plunger 45 is also pushed back to its old position.

As described above, when the plunger 45 is operated, the pivot shaft 31 and the pivot hole 37, which serve as the swing fulcrum of the swing arm 25, come into line contact at the corners on both sides of the recess 39, and are supported without slack. The indexing position can be determined with high precision.

Another embodiment shown in FIG. 4 is a pin type in which a swinging arm 63 is swingable, and is equipped with a tapered pin 61 that fits into a plurality of tapered holes 59 provided in an index plate 57. This is an indexing and positioning device.

A pivot 65 that is a swing fulcrum of the swing arm 63
The relationship between the shaft and the pivot hole 67 is the same as that of the above-mentioned rack and pinion type, and a recess 69 is provided, so that the swing arm 63 can be supported without slack through line contact.

Further, in this embodiment, the case of a four-axis controlled vertical turning center has been described, but the present invention can also be used in a general machine tool such as a lathe.

[Effect of idea]

As can be understood from the above description of the embodiments, the present invention is capable of engaging and disengaging the indexing engaging portions 21 and 59 provided on the indexed members 17 and 57 that are rotatable or reciprocating. An indexing positioning device is formed by pivoting arms 25, 63 having locking portions 23, 61 on the lower surface of the distal end thereof, and pivoting the pivot arms 25, 63 so as to be swingable in the vertical direction on the pivot shafts 31, 65.
Pivot holes 37, 6 of swing arms 25, 63 for
Recesses 39, 69 are formed on the upper side of the recesses 39, 69, and two corners formed on both sides of the recesses 39, 69 are used to attach the swing arm 2 to the pivot shafts 31, 65.
5 and 63 are pivotally supported, and the swing arm 2
5 and 63 are elastically biased toward the indexed members 15 and 57.

As is clear from the above configuration, in the present invention, on the lower surface of the distal end side of the swinging arm that is pivotally supported to be able to swing up and down in the indexing positioning device,
A locking part is provided that can be freely engaged and detached from the engaging part provided on the indexed member, and a recess is formed on the upper side of the pivot hole provided in the swing arm, and the swing arm is moved toward the indexed member. By applying force, the corners formed on both sides of the recess are brought into contact with the pivot, thereby pivotally supporting the swinging arm with respect to the pivot.

Therefore, according to the present invention, even if the clearance between the diameter of the pivot shaft and the pivot hole of the swing arm is large, the swing arm will fit into the corners on both sides of the recess formed at the top of the pivot hole. Since both of the two points on the part are pivoted to the pivot, the clearance for the error will be shifted to the lower side, and the product will be supported with virtually no clearance between it and the pivot. It is. Therefore, the index positioning accuracy is further improved compared to a structure in which the swing arm is simply supported on the pivot.

[Brief explanation of the drawing]

1 to 3 show an index positioning device according to the present invention, FIG. 1 is a cross-sectional view taken in the direction of the - line in FIG. 6, and FIG. 2 is a side view taken in the direction of the - line in FIG. 1. , Fig. 3 is an enlarged cross-sectional view of the main part in the direction of the - line arrow in Fig. 2, Fig. 4 is an explanatory diagram of the main part showing another embodiment, and Figs. A controlled vertical turning center is shown, with FIG. 5 being a front view and FIG. 6 being a side view. Explanation of symbols representing main parts of the drawings, 19...
... Index positioning device, 25 ... Swing arm, 3
1... Pivot, 37... Pivot hole, 39... Recess.

Claims (1)

[Scope of utility model registration request] Indexed member 1 that is rotatable or reciprocating
Swinging arms 25, 63 are provided with indexing engaging portions 21, 59 provided at 7, 57 and locking portions 23, 61 that can be freely engaged and disengaged on the lower surface of the distal end side, and are swingable in the vertical direction about pivots 31, 65. The swinging arm 2 with respect to the pivots 31 and 65 is
A recess 3 is formed on the upper side of the pivot hole 37, 67 of 5, 63.
The swinging arms 25 and 63 are pivotally supported on the pivots 31 and 65 by the two corners formed on both sides of the recesses 39 and 69, and the swinging arms 25 , 63 toward the indexed members 17, 57.