Geometrical instruments – Miscellaneous – Light direction
Reexamination Certificate
2000-02-02
2001-11-06
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Miscellaneous
Light direction
Reexamination Certificate
active
06311402
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a rotary transducer having a clamping device for connecting a transducer shaft to a drive shaft of a drive unit in a manner fixed against relative rotation.
2. Discussion of Related Art
Such rotary transducers are used particularly in machining tools for measuring the relative position of a tool to a workpiece to be machined. The stator of the rotary transducer is mounted in a manner fixed against relative rotation on the stator of the drive unit, such as a motor, and the transducer shaft is coupled in a manner fixed against relative rotation to the drive shaft.
The object of the invention is to create a rotary transducer with a clamping device for connecting the rotor of the rotary transducer to the drive shaft of a drive unit, which is simple to manufacture and has easily manipulated, secure clamping.
BRIEF SUMMARY OF THE INVENTION
One aspect of the present invention regards a rotary transducer and drive shaft system that includes a drive shaft and a rotary transducer that has a stator, a rotor that is rotatable relative to the stator, and a clamping device for connecting the rotor to the drive shaft in a manner fixed against relative rotation. The clamping device includes an eccentric cam that is rotatably supported in a bore of the rotor and has an eccentric circumferential face that comes into contact with the drive shaft and clamps it upon rotation.
A second aspect of the present invention regards a rotary transducer and drive shaft system that includes a drive shaft and a rotary transducer that has a stator, a rotor that is rotatable relative to the stator and has a radially deformed part and a clamping device for connecting the rotor to the drive shaft in a manner fixed against relative rotation. The clamping device includes an eccentric cam that is rotatably supported in a bore of the rotor and has an eccentric circumferential face, wherein the eccentric circumferential face, upon rotation, comes into contact with the deformable part of the rotor and partially deforms it in the region of contact and forces it onto the drive shaft.
A third aspect of the present invention regards a rotary transducer and drive shaft system that includes a drive shaft and a rotary transducer that has a stator; a rotor that is rotatable relative to the stator and a clamping device for connecting the rotor to the drive shaft in a manner fixed against relative rotation. The clamping device includes a first eccentric cam with a spirally curved circumferential face and a second eccentric cam with a spirally curved circumferential face, wherein the first and second eccentric cams are each rotatably supported in a corresponding bore of the rotor, and the spiral circumferential faces of the first and second eccentric cams, upon rotation, come into contact with the drive shaft and clamp it. In addition, a radius (r) of the circumferential face of the first eccentric cam increases steadily counter-clockwise over virtually the entire circumference, and a radius (r) of the circumferential face of the second eccentric cam increases steadily clockwise over virtually the entire circumference.
The advantages attained with each of the above aspects of the present invention are in particular that the clamping device is easy to make, can be adapted easily to arbitrary diameters of the drive shaft to be clamped, is axially easily accessible and actuatable, and assures a reliable connection of the rotor of the rotary transducer to the drive shaft of the drive unit in a manner fixed against relative rotation.
REFERENCES:
patent: 4369578 (1983-01-01), Ernst
patent: 4495700 (1985-01-01), Ernst
patent: 4530155 (1985-07-01), Burkhardt et al.
patent: 4530159 (1985-07-01), Ernst
patent: 4616131 (1986-10-01), Burkhardt
patent: 4660288 (1987-04-01), Dangschat
patent: 4667096 (1987-05-01), Dangschat
patent: 4700062 (1987-10-01), Ernst
patent: 5018397 (1991-05-01), Matich
patent: 5446966 (1995-09-01), Ishizaki
patent: 5981940 (1999-11-01), Setbacken et al.
patent: 6194710 (2001-02-01), Mitterreiter
U.S. application No. 09/286,404, Mitterreiter, filed Apr. 15, 1999, Pending Application Assigned to Dr. Johannes Heidenhain GmbH.
U.S. application No. 09/354,0474, Mitterreiter, filed Jul. 15, 1999, Pending Application Assigned to Dr. Johannes Heidenhain GmbH.
U.S. application No. 09/365,118, Dieter, filed Jul. 30, 1999, Pending Application Assigned to Dr. Johannes Heidenhain GmbH.
U.S. application No. 09/506,752, Feichtinger, filed Feb. 18, 2000, Pending Application Assigned to Dr. Johannes Heidenhain GmbH.
Brandl Alois
Mitterreiter Johann
Bennett G. Bradley
Brinks Hofer Gilson & Lione
Dr. Johannes Heidenhain GmbH
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