Appeal No. 1999-1998
Application 08/793,365
load state of the motor. The circuit produces a difference
value between a predetermined nominal rpm value and an actual
rpm value, and the difference value is then compared to a
predetermined limit value. If the limit value is exceeded,
the circuit emits an overload signal.
Claim 1 is the only independent claim on appeal, and it
reads as follows:
1. An improved circuit for operating a DC electric
motor, the circuit having an arrangement that produces a
signal serving as a measure for the rpm of the electric motor
and having a monitoring arrangement for detecting an increased
load state of the electric motor, wherein the improvement
comprises:
the monitoring arrangement (24) compares an rpm
difference (N ) between a predetermined nominal rpm value
D
(N ) and the actual rpm determined from the actual rpm value
SOLL
signal (N ) to a predetermined limit value, and emits an
IST
overload signal (25) if the limit value is exceeded.
The references relied on by the examiner are:
Fassel et al. (Fassel) 4,514,670 Apr. 30,
1985
Iizawa et al. (Iizawa) 4,641,067 Feb. 3,
1987
Ishikura 5,317,244 May 31,
1994
Claims 1, 2, 5 and 8 stand rejected under 35 U.S.C. §
102(b) as being anticipated by Fassel.
Claim 5 stands rejected under 35 U.S.C. § 103(a) as being
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