Canon DR-2050SP Specifications download pdf (Page 10)

DR-2050SP / C Release Letter 10 Version 1.1 July 2007

Reliable Paper Feeding Mechanism

The high-precision roller system of the DR-2050C and DR-2050SP ensures smooth, jam-free

document feeding each and every time. The main components of Canon’s exclusive feed

mechanism are a feed roller and a retard roller. The set of document separation rollers, “Retard

Rollers” separates consecutive sheets that are being pushed in the opposite directions,

minimizing document double-feeds.

Document Feeding with Single Sheet

When scanning a single sheet document, the Retard Roller, because it is not fixed to its axle, is

rotated by the Feed Roller. The rotation of the axel of the Retard Roller is reverse to the rotation

of the axle of the Feed Roller. These movements are a result of increased friction of B compared

to A.

Document Feeding and Separation with Multiple Sheets

Conversely, when scanning multiple sheets, friction A becomes the dominant power to rotate the

Retard Roller since friction C is less (Friction A > C). As a result, the Retard Roller begins to

invert its rotation, which pushes the second page back to keep the correct scanning sequence.

The Roller & Pad systems used by competitors have no means of pushing page 2 back out of the

feed path. Because part of page 2 enters the scanner, there will be an overlap between the

bottom part of page 1 and the top part of page 2, resulting in missing image data.

Multisheet forms bound together can also be fed through and reliably scanned with the DR-

2050C and DR-2050SP when this separation mechanism is disabled, called Bypass Mode

Additionally, when documents are fed by the Feed Roller, so little pressure is applied to the other

side against the Retard Rollers (made up of soft sponge covered with rubber on surface), that

documents are less likely to pickup dust during scanning jobs.

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Canon DR-2050SP Specifications Page 10