The machine can automatically detects the size of the paper when the operator adjusts the positions of the side fences and end fence to sides of the paper.
- Moving the side fences [A] and end fence [B] moves a metal wheel [C] that activates combinations of 5 micro-switches on a detection board [D] inside the tray.
 - Each switch corresponds to a bit, and the readings of the detected positions (shown in the table below) detect the size is also and display it on the operation panel.
 
Paper Size  | Sub Scan  | Main Scan  | A  | B  | C  | D  | E  | 
|---|---|---|---|---|---|---|---|
12” x 18”  | 457.2  | 304.8  | 1  | 1  | 1  | 1  | 1  | 
A3  | 420  | 297  | 1  | 1  | 0  | 0  | 1  | 
B4  | 364  | 257  | 1  | 0  | 0  | 1  | 1  | 
A4 SEF  | 297  | 210  | 0  | 1  | 0  | 0  | 1  | 
A4 LEF  | 210  | 297  | 1  | 1  | 0  | 0  | 0  | 
B5 SEF  | 257  | 182  | 1  | 0  | 1  | 0  | 1  | 
B5 LEF  | 182  | 257  | 0  | 0  | 0  | 1  | 1  | 
A5 SEF  | 210  | 148  | 1  | 1  | 1  | 0  | 1  | 
A5 LEF  | 148  | 210  | 0  | 1  | 1  | 0  | 1  | 
DLT (11” x 17”)  | 431.8  | 279.4  | 1  | 1  | 1  | 0  | 0  | 
LG (8.5” x 14”)  | 355.6  | 215.9  | 1  | 0  | 1  | 1  | 0  | 
LT SEF  | 279.4  | 215.9  | 1  | 1  | 0  | 1  | 0  | 
Paper Size  | Sub Scan  | Main Scan  | A  | B  | C  | D  | E  | 
|---|---|---|---|---|---|---|---|
LT LEF  | 215.9  | 279.4  | 0  | 1  | 1  | 0  | 0  | 
HLT SEF  | 215.9  | 139.7  | 0  | 1  | 1  | 1  | 0  | 
HLT LEF  | 139.7  | 215.9  | 1  | 1  | 1  | 1  | 0  | 
F4 (8.5 x 13”)  | 330.2  | 215.9  | 1  | 1  | 0  | 1  | 1  | 
Folio (8.25” x 13”)  | 330.2  | 209.55  | 0  | 1  | 0  | 1  | 1  | 
F (8” x 13”)  | 330.2  | 203.2  | 0  | 1  | 1  | 1  | 1  | 
Exec SEF (7.25” x 10.5”)  | 266.7  | 184.2  | 1  | 0  | 1  | 0  | 0  | 
Exec LEF (7.25” x 10.5”)  | 184.2  | 266.7  | 0  | 0  | 1  | 1  | 1  | 
8-Kai SEF  | 390  | 267  | 0  | 0  | 1  | 1  | 0  | 
16-Kai SEF  | 267  | 195  | 1  | 0  | 0  | 1  | 0  | 
16-Kai LEF  | 195  | 267  | 1  | 0  | 1  | 1  | 1  |