Canon IR2800, IR3300 Controlling the Scanner Motor, Controlling the Motor When Scanning an Image

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

2.2 Controlling the Scanner Motor

The system used to control the scanner motor is constructed as follows:

The motor driver turns on/off the scanner motor and controls its direction and speed of rotation in keeping with the signals from the CPU and motor driver controller.

Reader controller PCB	+24V		Scanner motor
		J401
	A
CPU		1
		5	M400
Motor	A*
		2
driver	B
		3
Motor driver	B*	6
contoroller		4

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2.2.1 Controlling the Motor When Scanning an Image

When scanning an image, the motor is controlled as follows, thereby controlling the movement of the No. 1 mirror base unit:

Stream reading position
(start position)	HP	Image leading edge	Image end Stop
	Accelerate	Maintain	Decelerate

Travel
speed	[2]	[3]	[4]
[1]
		Travel distance

[1]Acceleration. Used to accelerate until the speed most appropriate to the read ratio is attained.

[2]Approach run. Used to ensure that speed stabilizes.

[3]Image read. Used to read the image at a specific speed suited to the read ratio.

[4]Deceleration. Used to enable the scanner to speed down and stop promptly, starting at the end of the image.

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COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 2-7 R