Original Size Detection To detect a original size on the copyboard glass

Original Size Detection

a. Overview

The machine detects a size of original on the copyboard glass based on the combination (presence/absence) of output level changes from the reflective sensors located under the copyboard glass.

●Without original: The reflected light from the reflective sensor changes when the platen cover (or ADF) is opened and also it is closed.

●With original:      The reflected light from the reflective sensor does not change when the platen cover (or ADF) is opened and also it is closed.

The machine differs in terms of the original size it supports (inch, AB metric) depending on where it is shipped. It, therefore, comes with a specific type of reader unit to accommodate the different needs of different countries.

　

Reader Type Original Sensor Destination Main scan direction Sub scan direction INCH/A type PS504 PS506, PS508 America (USA, CAN, CLA) INCH/AB type PS504, PS505 PS506, PS507 Asia/Oceania (CA, CSPL, CHK, CCN, LC, TW) A type PS505 PS506 Europe (EUR, FRN, UK, DL, ITA) INCH/A type

INCH/AB type

A type

Combinations between output level of the sensors and paper size are as follows.

　

○INCH/A type 

Original Size		PS504	PS505	PS506	PS507
INCH type	11" x 17"	○	○	○	○
	LTR	○	○	●	●
	LGL	○	●	○	○
	LTR-R	●	●	○	○
AB type	A3	○	○	○	○
	A4	○	○	●	●
	A4-R	●	●	○	○
No original		●	●	●	●

INCH/AB type

Original Size		PS504	PS505	PS506	PS507
INCH type	11" x 17"	○	○	○	○
	LTR	○	○	●	●
	LGL	○	●	○	○
	LTR-R	●	●	○	○
AB type	A3	○	○	○	○
	A4	○	○	●	●
	B4	○	●	○	○
	B5	●	○	○	○
	A4-R	●	●	○	○
	B5-R	●	●	○	●
No original		●	●	●	●

○A type

Original Size	PS504	PS505	PS506	PS507
A3	○	○	○	○
A4	○	○	●	●
B4	○	●	○	○
B5	●	○	○	○
A4-R	●	●	○	○
B5-R	●	●	○	●
No original	●	●	●	●

It is not possible to tell apart reader units designed for inch and A metric configurations (i.e., 11x17 and A3; LTR and A) because of sensor arrangement. To avoid confusion, each reader unit is set to either inch/A or inch/AB to suit the expected country of installation at time of shipment from the factory.

If the reader unit is set to the inch configuration, all sheets placed on the copyboard will be identified as one of inch-configured sheets (e.g., A4 will be identified as LTR). On the other hand, if the reader unit is configured to A- or AB-metric, all sheets will be identified as A- or AB-configured sheets.

b.Detecting Operation

Operation of original detection is described below.

　

-BOOK mode

  When original is 1 sheet (A4-R), and the copyboard cover (platen cover/ADF) is closed.

　

1) Standby ∙Original Sensor: OFF 2) When the copyboard cover is opened (the opening angle is more than 25 degrees) ∙Original sensor: OFF 3)  When the copyboard cover is closed (the opening angle is 25 degrees) ∙Original sensor: ON and the original size judgment process (1) 4) When the copyboard cover is closed (the opening angle is more than 5 degrees and less than 25 degrees) ∙Original Sensor: ON and the original size judgment process (2) 5) When the copyboard cover is closed (the opening angle is 5 degrees or less) ∙Original size is confirmed. ∙Original sensor: OFF Original size is determined by comparing judgment data between the original judgment process (1) and (2) then detecting the changes. The sensor output level may not be changed in the following cases, leading to a fault in original size detection. ∙Solid black original in A3 size ∙Book-type original (The copyboard cover fails to be closed properly due to thickness of original, becoming hard to detect sensor level changes.) ∙When the copyboard cover is not closed properly. (The sensor level changes are not detected after the above timeout has been passed.)