Slow Scan Operation - Kodak DirectView CR 800 System Theory Manual

Slow Scan Operation

Illustration of Basic Slow Scan subsystem
components
8–36
Three main components are involved in SLOW SCAN operation:
• A6 SLOW SCAN CONTROLLER BD
• SLOW SCAN MOTOR, including
– STEEL PLATE, which works with the A7 COIL BD to generate the
magnet which creates torque in the MOTOR.
– A7 COIL BD, which maintains the correct rotation of the SLOW SCAN
MOTOR. See "A7 COIL BD Operation."
– MAGNET/FLYWHEEL. The FLYWHEEL is a heavy steel cylinder used
to add rotating mass to the MOTOR and smoot out its rotation. At the
upper end of the cylinder is a very strong MAGNET.
• ENCODER, which monitors the speed and position of the MAGNET in its
rotation to ensure extreme smoothness and constant velocity.
"ENCODER Operation."
Function of the A 6SLOW SCAN CONTROLLER BD
The A6 SLOW SCAN CONTROLLER BD is programmed to perform predefined
movements of the SLOW SCAN MOTOR. The A7 COIL BD and the ENCODER
are cabled directly to the A6 CONTROLLER.
Typically the parameters of a movement include:
• Which direction (clockwise or counter-clockwise) the MOTOR will move.
• How many encoder counts the MOTOR must move.
• How fast the MOTOR must accelerate.
• What speed the MOTOR must run.
• How fast the MOTOR must de-celerate.
See
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