Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
1999-04-05
2001-02-27
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C341S013000
Reexamination Certificate
active
06194710
ABSTRACT:
Applicant claims, under 35 U.S.C. § 119, the benefit of priority of the filing date of Apr. 16, 1998 of a German patent application, copy attached, Ser. No. 198 16 827.6, filed on the aforementioned date, the entire contents of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an angle measuring device for measuring the angular position of two objects, which can be rotated in respect to each other.
2. Discussion of Related Art
Such angle measuring devices are also called “built-in angle encoders”, which do not have their own seating.
Fixation elements, which fix the correlation between the graduation support and the scanning mechanism during installation in order to make the attachment of these angle measuring devices easier are known, for example, from U.S. Pat. No. 4,639,595, U.S. Pat. No. 4,556,792, DE 37 40 744 A1, U.S. Pat. No. 5,057,684, EP 0 280 390 A1, EP 0 353 395 B1 and EP 0 557 564 B1.
In these cases the fixation element as a rule consists of a separate component, for which attachment surfaces as the locating surfaces are provided on the scanning mechanism and on the hub or graduated disk.
In connection with the angle measuring device in accordance with
FIG. 7
of EP 0 353 395 B1, the fixation element consists of resilient tongues, which are formed as one piece on the stationary scanning mechanism and extend around the hub.
The elaborate production of these known angle measuring devices is disadvantageous.
SUMMARY OF THE INVENTION
One aspect of the present invention regards an angle measuring device for measuring the angular position of two objects, which can be rotated in respect to each other. The device includes a graduated disk with a graduation and fastened on a hub. A scanning mechanism to scan the graduated disk and a fixation element including an axially extending projection of the hub, which is rigid in the axial direction and elastically resilient in the radial direction so as to fix the axial position relation between the graduated disk and the scanning mechanism, wherein the projection exists in a position of rest where the projection does not contact the scanning mechanism. A pressure element that displaces the projection from the position of rest to a clamping position where the projection clamps the scanning mechanism.
One advantage and object of the present invention is to provide an angle measuring device wherein the required correlation between the graduation support and the scanning mechanism is already preset by the manufacturer of the measuring device in a simple manner, and which can be easily produced.
REFERENCES:
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patent: 4320578 (1982-03-01), Ernst
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patent: 4495700 (1985-01-01), Ernst
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patent: 4530159 (1985-07-01), Ernst
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patent: 4639595 (1987-01-01), Okita et al.
patent: 4660288 (1987-04-01), Dangschat
patent: 4663851 (1987-05-01), Feichtinger
patent: 4794250 (1988-12-01), Togami
patent: 4942295 (1990-07-01), Brunner et al.
patent: 5057684 (1991-10-01), Service
patent: 5155401 (1992-10-01), Kanaya et al.
patent: 6096989 (2000-08-01), Kinoshita
patent: 37 40 744 (1988-06-01), None
patent: 0 280 390 (1988-08-01), None
patent: 0 353 395 (1990-02-01), None
patent: 0 557 564 (1993-09-01), None
Pending Patent Application No. 09/354,047, Inventor: Mitterreiter, Filing Date: Jul. 15, 1999—to be assigned to Johannes Heidenhain GmbH.
Pending Patent Application No.—Unassigned (attorney docket No. 56/327), Inventor: Michel et al., Filing Date: Jul. 30, 1999—to be assigned to Johannes Heidenhain GmbH.
Allen Stephone B.
Brinks Hofer Gilson and Lione
Dr. Johannes Heidenhain GmbH
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