Horizontally supported planar surfaces – Power driven
Patent
1997-08-12
1999-11-23
Chen, Jose V.
Horizontally supported planar surfaces
Power driven
A47B 8500
Patent
active
059880759
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to machine tools and, more particularly, to a swiveling table apparatus used as a table for machine tools in general such as units for which the swivel angle must be adjusted, e.g., grinding wheel spindles and main spindles for internal grinding machines and main spindles, grinding wheel spindles and tailstocks for cylindrical grinding machines.
Background Information
For example, internal grinding according to the prior art often results in insufficient grinding at a deep internal surface of a work piece and hence in poor cylindricity for reasons including the fact that the grind stone is in contact with such a deep region for a period of time shorter than with a region of the internal surface of the work piece closer to the entrance thereof.
A conventional practice in order to mitigate the reduction in cylindricity has been to incline the grind stone relative to the center axis of the work piece or to incline the work piece rather than the grind stone relative to the center axis of the grind stone when grinding the internal surface thereof.
The mechanism disclosed in Japanese examined patent publication No. H5-47347 is known as a means for inclining a grind stone or a work piece.
As shown in FIG. 7, this mechanism inclines a grind stone 50 relative to a work piece by swiveling a wheel spindle stock 52 about a base point 51 at a predetermined angle and includes a hydraulic cylinder 53 and an eccentric cam mechanism 54 as a driver for such a swivel operation.
Specifically, as a cylinder rod 53a of the hydraulic cylinder 53 is advanced and retracted, the eccentric cam mechanism 54 operates to displace an eccentric cam shaft 55, and displacement of the same from side to side is transmitted to arm portions 57, 57 through a bearing 56. This results in a movement of the arm portions 57, 57 along with a coupling plate 58 integral therewith to cause the wheel spindle stock 52 to swivel about the base point 51.
However, since the swivel operation has been conventionally caused by the eccentric cam mechanism 54 as described above, it has not been possible to change the swivel angle through numerical control. Further, although the setting of the swivel angle can be changed through a design change on the eccentric cam mechanism itself, this inevitably necessitates complicated operations such as replacing the eccentric cam mechanism 54 itself and results in poor operability in changing the setting of the swivel angle.
The present invention has been conceived taking the above-described situation into consideration. It is an object of the present invention to provide a swiveling table apparatus which allows the setting of the swivel angle to be changed by means of numerical control. Another object of the present invention is to provide a swiveling table apparatus which is easy to use.
SUMMARY OF THE INVENTION
The foregoing and other objects of the present invention are achieved by a swiveling table apparatus comprising a base, a table main body disposed on the base and mounted for swiveling movement about a swivel axis, a driving mechanism including a servo motor for generating a driving power to swivel the table main body about the swivel axis, and power transmission means for transmitting the driving power of the servo motor to the table main body.
In a first embodiment, the power transmission means comprises a ball screw rotated by the driving power generated by the driving mechanism.
In a second embodiment, the power transmission means comprises a ball screw rotated by the driving power generated by the driving mechanism. The ball screw has an end portion for abutment with a first side portion of the table main body. A biasing member biases the table main body toward the ball screw and is disposed for abutment with a second side portion of the table main body opposite the first side portion thereof. The table main body is disposed between the ball screw and the biasing member.
In a third embodiment, the power transmission mean
REFERENCES:
patent: 2902741 (1959-09-01), Hankin, Jr.
patent: 5685232 (1997-11-01), Inoue
patent: 5761960 (1998-06-01), Nagai et al.
patent: 5794541 (1998-08-01), Hirose
Akbari Javad
Arai Shigehiro
Chen José V.
Seiko Seiki Kabushiki Kaisha
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