Canon IR2800, IR3300 Operation of the Cassette Lifter, Operation of the Lifter During Printing

CHAPTER 5 PICK-UP/FEEDING SYSTEM

3.4 Operation of the Cassette Lifter

The lifter is operated as necessary in the course of printing to maintain the stack of sheets to a specific height.

3.4.1 Operation of the Lifter During Printing

The lifter is controlled by the movement of the pickup roller shaft. When the pickup roller

shaft pushes the lifter trigger lever, the cam is released, and the lifter starts to move up until
the lifter trigger lever stops the cam.
1) Each time the pickup roller DOWN so-
	SL1
lenoid (SL1) goes ON, the pickup roller
shaft [2] moves down to initiate pickup		[1]	[2]
operation.
2) When the sheets [6] decrease and, as a				[3]
result, the descent distance [3] of the
pickup roller increases, the pickup roller
shift pushes down the lifter trigger lever
[4].			[4]
	[7]	[6]
			[5]

3) When the lever is pushed down, the cam

[5] is released, causing it to rotate.

4) The rotation of the cam turns the eccen-

tric cam [3] mounted to the same shaft.[1] The eccentric cam operates the lifter UP lever [2] to move up the lifter gear [1].

5)The lifter moves up and, as a result, the paper stack moves up; when the pickup roller shaft reaches a specific height, the lifter trigger lever is drawn back by the work of a spring, thereby stopping the cam.

[2]

[3]

F05-304-01

The foregoing series of operation is repeated to maintain the height of the paper stack to a specific level. The cassette pickup operation ends when paper runs out and the cassette pa- per sensor detects the absence of paper.

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 5-11 P