Appeal No. 1998-1231 Page 12
Application No. 08/729,835
in very little registration error, the 8 hertz, 16
hertz, and higher frequency disturbances produced by
the motor will be much more out of phase, resulting
in a larger registration error. These errors are
illustrated graphically in Figure 1. Using the
shaded area corresponding to registration error
under the lowest frequency pulse as a reference of
1, the mid frequency error would be 3.7, and the
high frequency error would be 4.9.
Due to the phase problem, the magnitude of the
disturbances must be made as small as possible at higher
frequencies. One way of reducing certain of these
disturbances is to feed back the motor velocity in
addition to the surface velocity.
In addition, the examiner’s attention is directed to the
description of Figures 4A and 4B (specification, page 12)
which
discloses that
Figure 4A illustrates a torque response curve
utilizing a photoreceptor drive system without
the velocity control system of the invention
herein . . . . Figure 4B illustrates the torque
response curve utilizing the dual feedback system.
It can be seen that there is a two to three time
improvement of the torque disturbance at the 8 hertz
and 16 hertz response points. The 8 and 16 hz.
frequencies are indications of motor torque error
frequencies.
From this disclosure of appellants, we find that the language
“to prevent motor torque disturbances from affecting the
velocity of the driven component” to be clearly defined and
supported by the disclosure.
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