JPH05285757A - Table clamp mechanism in rotary table - Google Patents

Abstract

PURPOSE:To clamp a table in a still condition surely by projecting a projection piece in the outer direction to the table, and providing it to be held with the top of a sliding member and the upper surface of a recess. CONSTITUTION:A recess 3 is provided on the inner peripheral surface of a frame main body 1, and an elastic plate member 4b is provided on the lower surface of the recess 3. A sliding member 5 is provided to the elastic plate member 4, the elastic plate member 4 and the frame main body 1 are fixed with a bolt 6, and the elastic plate member 4 and the sliding member 5 are fixed with the bolt 6 to the fixing part between the elastic plate member 4 and the frame main body 1 placing a specific distance. On the other hand, a projection piece 7 is projected in the outer direction to the table 2, and the projection piece 7 is held and fixed by the top of the sliding member 5 and the upper surface of the recess 3 so as to clamp the table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table clamp mechanism for a rotary table which is placed on a table of a machine tool for machining such as a machining center and used for rotating and indexing a work.

[0002]

2. Description of the Related Art Conventional rotary tables generally employ worm / worm wheels as a rotating mechanism of the table.

[0003]

In the case of this worm / worm wheel structure, since the worm / worm wheel has a meshing structure, backlash occurs due to the presence of backlash even when the table is stationary, and the indexed table However, there is a disadvantage that the work machining accuracy on the table becomes poor due to the deviation of the angle.

It is a technical object of the present invention to provide a table clamp mechanism for a rotary table that solves the above drawbacks.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

In a rotary table in which a table 2 is rotatably provided on a frame body 1, a concave portion 3 is provided on an inner peripheral surface of the frame body 1, and an elastic plate member 4 is provided on a lower surface of the concave portion 3.
The elastic plate member 4 is provided with a sliding member 5, and the elastic plate member 4 and the frame main body 1 are fixed to each other by appropriate means such as pins and bolts 6, and the elastic plate member 4 and the frame main body 1 are fixed to each other. The elastic plate member 4 and the sliding member 5 are fixed to each other by a suitable means such as a pin or a bolt 6 while keeping a predetermined distance from the portion, while a projecting piece 7 is provided on the table 2 so as to project outward. The present invention relates to a table clamp mechanism in a rotary table, wherein the projecting piece 7 is sandwiched between the top of the sliding member 5 and the upper surface of the recess 3.

[0007]

Since a part of the elastic plate member 4 is fixed to the sliding member 5 and a part of the elastic plate member 4 is fixed to the lower surface of the concave portion 3, only a part of the elastic plate member 4 slides. Therefore, the sliding member 5 slides against the elasticity of the elastic plate member 4, and the projection 7 of the table 2 is sandwiched between the top of the sliding member 5 and the upper surface of the concave portion 3. The table 2 is clamped.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show one embodiment of the present invention.
This will be described below.

A direct drive motor (hereinafter referred to as DD motor 13) is installed in the center of the frame body 1, and a circular table 2 is fixed to the top of an output shaft 14 of the DD motor 13 with bolts. The outer peripheral surface of the table 2 is provided with a collar plate-shaped projecting piece 7. The protrusion 7 has a thin portion 7 ′ formed near the base, and the tip of the protrusion 7 is provided on the upper surface of the recess 3 of the frame body 1 which will be described later and the top of the sliding member 5. Care is taken to make surface contact with the surface 5'as much as possible.

An annular recess 3 is formed on the inner peripheral surface of the frame body 1.
The projection 1'is provided on the upper surface of the recess 3.

An annular leaf spring 4 is provided on the lower surface (step surface) of the recess 3.
The leaf spring 4 and the lower surface of the concave portion 3 are fixed to each other with bolts 6 at three positions at equal intervals.

The sliding member 5 arranged in the recess 3 has the recess 3
Inside, there is provided a hanging piece 12 which is slidable in the output shaft direction of the DD motor 13 and is not rotatable, and which slidably contacts the inner surface of the frame body 1 inside the lower surface.
The inner surface of the sliding member 5 is set so as to be capable of sliding contact with the outer surface of the DD motor 13.

The sliding member 5 is fixed to the leaf spring 4 by three bolts 6 arranged at equal intervals. Therefore, the sliding member 5 is arranged in the recess 3 in a rotation-stop state. If the sliding member 5 has a backlash, the protrusion 7 cannot be clamped well, but since the sliding member 5 is in the rotation stop state (unrotatable state), the protrusion 7 is clamped, that is, the table 2.
Will be reliably clamped.

The positions of the bolts 6 for fixing the sliding member 5 and the plate spring 4 are located exactly in the center of the positions of the bolts 6 for fixing the plate spring 4 and the recess 3. Therefore, the bolt 6 for fixing the sliding member 5 and the plate spring 4 and the bolt 6 for fixing the plate spring 4 and the recess 3 are arranged every other one.

Reference numeral 8 is a fluid (air) supply unit, 9 is a lid, 10 is a sealing material for preventing fluid (air) from leaking from the fluid supply unit 8, and 11 is a fluid supply unit 8. It is a passage for delivering a fluid (air).

Since the holding torque of the DD motor 13 due to the servo lock at the time of stop is small, when the table 2 is mounted on a machine tool and cut on the table 2, the table 2 vibrates slightly,
Since the stationary accuracy (indexing accuracy) of the table 2 is deteriorated, when the DD motor 13 is used for the rotary table, it is generally limited to machining with extremely small cutting force. When used for machining with large cutting force, a cylinder mechanism for clamping the table will naturally be installed.

However, even if such a cylinder mechanism is adopted, the whole rotary table becomes large and the cost becomes high.

Therefore, in order to make the entire device "small", the DD
Even though the motor 13 is used, the size of the device becomes large, and the features of the DD motor 13 cannot be utilized.

Since this embodiment is constructed as described above, the following operational effects are exhibited.

The leaf spring 4 is provided from the fluid supply portion 8 through the passage 11.
When air is introduced between the sliding member 5 and the sliding member 5,
Slides upwards. In this case, since the leaf spring 4 is fixed to the sliding member 5 at three places and is fixed to the lower surface of the concave portion 3 at three places, the leaf spring 4 is resisted against the elasticity of the leaf spring 4. The sliding member 5 slides while pulling at three positions spaced by a predetermined distance.

By the sliding of the sliding member 5, the tip portion of the projecting piece 7 of the table 2 is sandwiched between the top surface 5'of the sliding member 5 and the projecting ridge 1'of the frame body 1, and the table 2 Is securely clamped.

At this time, since the thin portion 7'is formed near the base of the protrusion 7, the tip of the protrusion 7 has a top surface 5'as much as possible.
And the ridge 1'are brought into surface contact with each other, and the reduction of the clamping force is prevented.

When the supply of air from the fluid supply unit 8 is stopped, the leaf springs 4 that have been pulled by the sliding member 5 at the three positions are pulled back by the restoring force, so that the top surface 5 of the sliding member 5 is pulled back. The sandwiching of the projecting piece 7 between'and the ridge 1 of the frame body 1'is released.

Therefore, according to this embodiment, since the DD motor 13 having no backlash is adopted and the table 2 can be securely clamped and fixed because of the clamp by the non-rotatable sliding member 5, It would be possible to provide a small rotary table.

[0025]

As described above, the present invention provides a table clamping mechanism for a rotary table which can reliably clamp the table in a stationary state and can withstand a relatively large cutting force.

[Brief description of drawings]

FIG. 1 is a sectional view of the present embodiment.

FIG. 2 is a plan view of a leaf spring according to this embodiment.

FIG. 3 is a cross-sectional view of a main part of this embodiment.

[Explanation of symbols]

 1 Frame Main Body 2 Table 3 Recess 4 Elastic Plate Material 5 Sliding Member 6 Bolt 7 Projection Piece 8 Fluid Supply Section

Claims (1)

[Claims] 1. A rotary table in which a table is rotatably provided on a frame body, a recess is provided on an inner peripheral surface of the frame body, an elastic plate member is provided on a lower surface of the recess, and a sliding member is provided on the elastic plate member. , The elastic plate member and the frame main body are fixed to each other by appropriate means such as pins or bolts, and the elastic plate member and the sliding member are pinned with a predetermined distance from the fixing portion between the elastic plate member and the frame main body. It is fixed by an appropriate means such as a bolt or a bolt, and on the other hand, a projecting piece is provided on the table so as to project outward, and the projecting piece can be sandwiched between the top of the sliding member and the upper surface of the recess. Table clamp mechanism for rotary tables.