Sharp AR-BC260 Service Manual page 69

The paper feed tray is provided with the paper size detection
block, and the status of this block is detected with the combination
of ON/OFF of the four paper size detectors to recognize the paper
size.
Relationship between the paper size detector and the paper size
Paper size detector
CSS4 CSS3 CSS2 CSS1
ON OFF OFF ON
OFF OFF ON ON
ON OFF ON OFF
OFF ON ON OFF
OFF ON ON ON
OFF ON OFF ON
ON ON ON OFF
ON ON OFF OFF
Patterns other than above
EXTRA: Operates with the paper size set by the user program.
The lift position sensor detects the lift plate lower limit position.
Then lift-up operation is started, and the rotation of the lift motor
up to detection of the upper limit by the paper upper limit detector
is used to calculate the paper remaining quantity.
b. Manual paper feed section operation
The paper pickup roller moves up and down to press paper and
separates the top paper, which is fed to the paper feed roller.
The paper feed roller feeds paper to the paper transport section.
The separation roller prevents against double feed.
The manual paper feed clutch controls ON/OFF of the pickup
roller and the paper feed roller.
The manual transport roller transports paper to the resist roller.
Paper feed roller
Transport roller
Separation roller
Pickup roller
Paper stopper
Paper feed roller
Transport roller
Separation roller
Paper size
Destination
AB
Japan Inch series
series
A3 A3 11 x 17
B4 B4 8.5 x 14
A4R A4R 11 x 8.5R
A4 A4 11 x 8.5
B5R B5 INVOICE
B5 A5 FOOLSCAP
A5 11 x 8.5 A4
EXTRA EXTRA EXTRA
Recognized that the paper tray
is not inserted.
Clutch
Paper feed motor
Pickup roller
AR-BC260 DESCRIPTIONS OF EACH SECTION 7 - 32
The paper size is detected by the paper length detector and the
paper width sensor.
A volume-type sensor is used as the paper width sensor. The
resistance varies according to variation of the paper guide position
to detect the paper width.
The tray position detector detects that the paper tray is set to the
maximum length position or to the minimum length position.
When the paper tray is set to the maximum length position, the
paper length detector is forcibly turned ON. This is to recognize it.
c. Paper transport section
This section transports paper from each paper feed section to the
transfer section (resist roller) by two transport rollers.
The paper transport clutch controls ON/OFF of each transport
roller.
Paper feed motor
Paper transport roller
Paper feed clutch
Paper transport roller