4413-XXX
3. Diagnostic aids
Theory of mechanism
Scanner mechanism
The scanner mechanism consists of components which feed, scan, and eject the documents that are to be copied or transmitted to a remote facsimile unit. These components and their functions are explained below.
Drive feed roller assembly
The drive feed roller assembly, consisting of various rollers, rubber pad, and springs, automatically separates and feeds the pages of a document over the scanning area and stacks them on the document exit tray.
Documents up to 15 pages can be placed in the drive feed roller assembly for scanning. The leading edge of the document moves the document detect sensor lever when the operator slides the stack into the drive feed roller assembly. The scan motor starts to rotate when the document detect sensor detects the leading edge of the document. The roller feeds the first page of the document into the feeder.
The scan motor stops when the leading edge of the page actuates the document scan sensor. The page is now in the scan position.
The drive feed roller assembly rubber pad prevents multiple sheets from being fed. A spring provides force that the pad places on the document pages for proper separation.
The scan motor is turned on when the machine is ready to scan the document and drives the feed roller at a speed determined by the resolution selected. The scan motor stops after a set period of time when the trailing edge of the page releases the document scan sensor. If another page is detected as the trailing edge of the page releases the document scan sensor, the next page feeds to the scan position. The exit roller pushes the page out onto the document exit tray where it is stacked.
Diagnostic aids