Xerox 2750 manual Key facts about fold programs, SEL = standard feed direction

Key facts about fold programs

•Orientation of the document as it enters the folder is important!

•The standard document feed orientation, SEL, is defined as “image up, title block leading, Short Edge Leading”.

•The “other” orientation, LEL, defined as “image up, title block trailing, Long Edge Leading”, is increasingly used in electronic printing installations having the ability to rotate images in software (unlike analog machines, in which the copy orientation is established by the original). This allows, for example, a D-size (22” x 34”) image to be printed on 34” wide media with a linear feed of only 22”, compared with the 34” feed necessary in the SEL orientation. LEL thus enables greater production rates. The downside of LEL, however, is in the restrictions it places on document folding programs.

The words “Landscape” and “Portrait” are the key to understanding what happens in the folder.

For SEL documents … Landscape means wide accordion panels, Portrait means narrow accordion panels For LEL documents … Landscape means narrow accordion panels, Portrait means wide accordion panels

SEL = standard feed direction

Image up, title block leading, short edge leading

PRINTER/ PLOTTER

Document

FOLDER

selfeed.cvs

LEL = non-standard feed direction

Image up, title block trailing, long edge leading

PRINTER/

PLOTTER

lelfeed.cvs

Document

FOLDER

•The folder automatically determines orientation by first classifying media width, e.g., the D/A1 group from 22” to 24”, then measuring feed length from leading edge to trailing edge. For this example, if the feed length so measured is less than 19”, the document’s orientation is assumed to be LEL. (Standard prints whose long dimension fits the D/A1 media group have short dimensions of 17” = ANSI D, 420mm = A1, and 18” = Architectural D.). If the measured feed length exceeds 19”, the document is assumed to be SEL.

•Note that the width classifying system recognizes a media width as belonging to a particular group. It doesn’t measure it specifically. This is not an issue with SEL fold programs, which are highly flexible, and can deliver neatly folded packets from practically all combinations of length and width. LEL programs are less flexible, but are capable of equally neat folding provided the document size approximates a standard sheet in the dimensional group (ANSI, Architectural or Metric) for which the folder is programmed.

•No matter what media width, document size, or orientation, the accordion folder will pass documents without folding unless the feed length is 3¼” greater than the selected panel width for accordion folding (210mm, 8½”, 9”, 11”, 297mm or 12”).

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