This scanner is simplicity itself. This view shows where the source roll is loaded. Note that the chucks are mounted on a rail
to facilitate variable roll width. The paper path is between the 2 wooden blocks and the all-metal carriage supporting the 2
A4 CIS sensors. The upper block contains a pair of 8" ccft lamps, also mounted offset to match the CIS arrays. A divider
immediately beneath the lamps supports an array to neutral density filters, more in the center than the ends, as these shorter
ccft lamps do not have absolutely even illumination end to end, contrary to what your eye might tell you.
The two ccft lamps are powered by a single inverter.
This view shows the take-up spool, with an optical encoder resting on the take-up roll. The optical encoder is rigidly affixed to a bar
mounted on a pivot to allow it to rise and fall with paper build-up. The rigid mount of the encoder ensurs its cable will not be severed
by repeated flexing with each roll change. Note the two 10-turn pots to adjust the "exposure" of each of the 2 A4 CIS sensors.
This view shows the electronics and the transmission. Note that the electronics are basically a normal MK3a board wedded to a
minimum Mk3 board containing the minimum circuitry to manage the data coming off the second A4 CIS sensor. The stepper motor
and its controller are salvaged from a dead scanner, and connected to a conventional player piano transmission. The transmission
has been stripped of everything but the rewind lever to disengage the paper for manual rewind. Note the simple manual rewind
made from another gear from a salvaged player piano transmission.
This view shows the scanner opened up to facilitate a roll change. The ccft lamps and the optical encoder are both swung away
from the roll in a single motion. The roll passes over the 2 A3 CIS sensors in intimate contact with their carriage.
The CIS themselves are mounted flush with the carriage surface, in an outside-in configuration, i.e., their connectors
are at each left and right extreme end.
This view shows the scanner loaded with a conventional 88n roll for scanning.
Note the source chucks closed up to support the roll in a central position.
This is the A4 twin-array scanner I had on display at the 2005 AMICA Convention in Minneapolis.