Appeal No. 2000-2032 Page 5
Application No. 09/017,187
downstream of a cutting cylinder and another of the
plurality of sensor sets being disposed upstream of a
quarter fold region, each of the plurality of sensor sets
including a first laser emitter associated with a first
diode receiver and a second laser emitter associated with
a second diode receiver, the first laser emitter and
first diode receiver being disposed on a first side of a
centerline of the desired path, the second laser emitter
and the second diode receiver being disposed on a second
side of the centerline.
7. A method for detecting deviations in a stream of
signatures in a folder, each signature having a lead and
trail edge, the method comprising the steps of:
sensing one of the lead edge and the trail edge by a
first sensor disposed at a first location downstream of a
cutting cylinder, the first location being on a first
side of a centerline of a desired path of the stream of
signatures;
sensing one of the lead edge and the trail edge by a
second sensor disposed at a second location downstream of
a cutting cylinder, the second location being on a second
side of the centerline;
determining a first skew in the signature by
comparing an output of the first sensor with an output of
the second sensor;
sensing one of the lead edge and the trail edge by a
third sensor disposed at a third location upstream of a
quarter folder region, the third location being on the
first side of the centerline;
sensing one of the lead edge and the trail edge by a
fourth sensor disposed at a fourth location upstream of a
quarter folder region, the fourth location being on the
second side of the centerline; and
determining a second skew in the signature by
comparing an output of the third sensor with an output of
the fourth sensor.
12. A method for detecting deviations in a stream of
signatures in a folder, the stream of signatures
including a first signature having a first trail edge and
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