Specifications

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3BUS 208 000 R130192 Platform Tuning
Head Package Dimensions Setup
The sensor head package dimensions are used to control the orientation of the
window over the sheet as the head moves through its various sequences. The
variables used for this purposes can be manipulated to accomplish a variety of head
behavior patterns as the head moves from off–sheet to a scanning condition. This
section contains information about the locations of these variables and a procedure
for determining their values. The head package dimensional variables are defined
below. Two basic equations deal with bringing the head on–sheet, depending
whether auto edge of sheet is turned on or not:
Auto Edge of Sheet Turned Off:
Prepare to measure position = homeScanLimit + homeHeadClearance −
homeWindowClearance + curlDist + positioningSafetyFactor
Auto Edge of Sheet Turned On:
Prepare to measure position = homeEOS + homeHeadClearance + curlDist +
positioningSafetyFactor
Definition of Head Package Dimensions
Table 5-3 Head Package Dimensions
(continued on next page)
homeHeadClearance This variable represents the distance between the
home–side edge of the sensor head package and the
measurement center line. Its value will depend on
how far beyond the home edge of the sheet the head
must come before starting the Prepare To Measure
activity. In any event, it must always be larger than
the homeWindowClearance.
farHeadClearance This variable represents the distance between the
far–side edge of the sensor head package and the
measurement center line. The variable only comes
into play when the head must enter the prepare to
measure position from the far side of the scanner. In
that case, it will have the same function as the
homeHeadClearance. When it is used, it must be
larger than the farWindowClearance.
homeWindowClearance This variable represents the distance, on the home–
side of the head package, from the measurement
center line to the edge of the largest sensor window
in the head package. The window radii will range
from approximately 0.5 in. for a Smart Ash sensor
to 2.5 in. for a HemiPlus sensor (see Figure 5-15).