An image scanning device that can be manufactured less costly. When ADF scans
an original document (21) loaded in a document hopper (22) of a document
feeder unit (12), a stepper motor (M2) is first driven by a motor
driver (101) such that it moves a first carriage (50) from a second
document scanning start position (P3) to a first document scanning position
(P2). The first carriage (50) carries a scanner (14). After
that, another stepper motor (M1) is activated by the same motor driver (101)
to move the original document (21) over a contact glass (25), and
the original document is scanned by the scanner (14). The two stepper motors
(M1, 2M2) are selectively driven by the single motor driver (101)
so that cost reduction is realized as compared with providing two motor drivers
for two stepper motors.
