MX-FN27. Service Manual for N Version - Sharp Copying Equipment Service Manual (repair manual). Page 38

MX-FN27 N, MX-PN14  OPERATIONAL DESCRIPTION  6 – 12

In staple operation, the specified number of sheets of paper is stapled by the stapler unit.

The staple position varies depending on the staple mode and paper size.

The stapler unit's home position is detected by the Stapler shift home position sensor (FNPS11).

After power ON, the finisher controller PCB drives the Stapler shift motor (FNM7) to return the stapler unit to the home position.

If the stapler unit is at the home position to begin with, it remains there in standby mode.

When a staple instruction is received from the host machine, the staple unit moves to the staple wait position according to the staple position.

Stapling occurs when the cam driven by the Stapler motor (FNSTPLIF) rotates once.

The cam's home position is detected by the staple home position sensor.

If the staple home position sensor is off, the finisher controller PCB runs the stapler motor until the staple home position sensor turns on and resets
the staple cam to its initial state.

Staple cartridge and staples inside the staple cartridge are detected by the staple detection sensor.

Whether the staple in the staple cartridge is pushed out to the leading edge of the cartridge is detected by the staple edging sensor.

– Number of sheets that can be stapled

The number of sheets that can be stapled exceeds the upper limit of the number of sheets that can be stapled, select whether the operatio is contin-
ued or canceled after the paper is fed into the tray.  

When the operation is continued, 50 sheets are delivered in a stack without stapling and the 51st sheet is delivered by itself.  And, the second stapling
papers also delivered by itself. 

When the operation is canceled, 50 sheets are delivered in a stack without stapling and operation is finished.  

When staple-free stapling is specified, the paper stack that is center-aligned by the processing tray is moved to the staple-free stapling position by the
front alignment plate and assist guide. The paper stack is clinched by the clinch arm.

The clinch arm's home position is detected by the Clinch home position sensor (FNPS15).

After power ON, the finisher controller PCB drives the Clinch motor (FNM9) to return the clinch arm to the home position. If the clinch arm is at the
home position to begin with, it remains there and waits.

Clinch errors are detected using clock pulses from the Clinch motor drive detection sensor (FNPS13).

The staple-free staple unit is fixed in place in the rear of the finisher. Only a single stapling position is used, which is at the rear. Stapling at four loca-
tions (upper left, upper right, lower right, lower left) is possible using the host machine's LUI through image processing of the printed surface.

After staple-free stapling, the paper stack is shifted to the center by the front and rear alignment plates and then delivered.

Stapling capacity

Small size (A4, B5, LTR, 16K, 
EXEC)

52 to 81.4g/m2: 50 sheets
More than 81.4 to 105 g/ m2: 30 sheets
More than 105 to 256 g/m2: 2 sheets

- Heavy: 5.5 mm or less
- In cover mode, this includes two heavy cover 
sheets.

Large size (A3, B4, A4R, 11X17(279 
x 32 mm), LGL, LTR-R, 8K)

52 to 81.4g/m2: 30 sheets
More than 81.4 to 105 g/ m2: 20 sheets
More than 105 to 256 g/m2: 2 sheets

Stapler shift motor 

(FNM7)

Stapler Unit

Stapler shift 

home position 

sensor (FNPS11)