Specifications

•
In this copier, the original is aligned with a corner for registration, while the
copy paper is fed through the center of the copier. Because of that, the
reference position of the image on the surface of the PC Drum varies
according to the copy paper size. This defies a single LED ON pattern for
the reduction mode, as was used conventionally. (Different LEDs are
turned ON in the reduction mode according to the copy paper size.)
If, however, a particular LED ON pattern is established for each reduction
ratio and each paper size, it requires a much larger storage capacity and
processing time than used in the conventional copiers. An LED ON pattern
for varying reduction ratios is therefore established only with the paper size
whose crosswise length is the maximum (A3 lengthwise = 297 mm). This
pattern is called LED ON Pattern B shown on the next page. For other
paper sizes, a particular reduction ratio is converted to that in the maximum
paper size and the reduction ratio found is applied to LED ON Pattern B to
find which LEDs are ON. This saves the storage space and processing
time.
•
The following formula is used to convert the actual reduction ratio to a ratio
for the maximum paper size.
M
NEW
= M + (PS
MAX
− PS) / (2 × PS
MAX
)
M
NEW
:
Conversion ratio M: Actual reduction ratio
PS
MAX
:
Maximum paper size (A3 lengthwise = 297 mm)
PS
:
Paper size to be used
•
Edge erase in the reduction mode is controlled by the logical sum of the
following: the LED ON data obtained by applying the ratio found through
the above formula to LED ON Pattern B and the LED ON data obtained by
applying the copy paper size to LED ON Pattern A.
Example: Copy paper size: A4 lengthwise, reduction ratio: 0.500
➀
When the variables are applied to the above formula:
M
NEW
= 0.500 + (297 − 210) / 2 × 297
= 0.646
➁
When 0.646 is applied to LED ON Pattern B:
We know that L42 to L64 are ON.
➂
When A4 lengthwise is applied to LED ON Pattern A:
We know that L1 to L10 and L55 to L64 are ON.
The logical sum of
➁
and
➂
are that L1 to L10 and L42 to L64 are ON.
M-66