MX-FN19, MX-FN20, MX-PN12. All Sections - Sharp Copying Equipment Specification (repair manual). Page 125

MX-FN19  OPERATIONAL DESCRIPTION  6 – 24

The horizontal registration drive for the punch slide unit is provided
by the horizontal registration motor (FPSM). The home position of
the punch slide unit is detected by the horizontal registration home
position sensor (FPSHPD). The punch slide unit detects the trailing
edge of sheets using the trailing edge sensor (LED5, PT5) and the
horizontal registration sensors (LED1 through 4, SREG1 through
4), and causes a move to a specific position matching the trailing
edge of each sheet (in relation to the size of the sheet).
The horizontal registration operation takes place as follows:
1) When the leading edge of a sheet from the host machine is

detected by the trailing edge sensor (LED5, PT5), the horizon-
tal registration motor (FPSM) starts to move the punch slide
unit toward the front.

2) When the horizontal registration sensor (LED1 through 4, PT1

through 4) suited to the paper size signal from the host
machine detects the rear edge of the sheet, the horizontal reg-
istration motor (FPSM) causes a further move to a specific
position, and stops the punch slide unit.

3)

When the trailing edge sensor (LED5, PT5) detects the trailing
edge of the sheet, the drive of the punch feed motor (FSIFM) is
stopped, thereby stopping the sheet. Then, the punch motor
(FPNM) is driven to punch holes in the sheet.

4)

When the punching operation ends, the punch feed motor
(FSIFM) of the finisher is driven and, at the same time, the hor-
izontal registration motor (FPSM) is rotated in reverse to return
the punch slide unit to its home position.

5)

For each sheet that arrives in succession, the punch slide unit
is returned to its home position, and is caused to repeat steps
1 through 4.

Punch slide unit

Trailing edge sensor

(LED5,PTR5)

Horizontal registration motor (FPSM)

Direction of

paper delivery

Paper

Horizontal registration sensor 1 (LED1 PTR1)

;used to detect the edge of sheets of A3, A4, LTR,

279mm x 432mm (11x17).

Horizontal registration sensor 2 (LED2 PTR2)

;used to detect the edge of sheets of B4, B5, LTRR, LGL.

Horizontal registration sensor 3 (LED3 PTR3)

;used to detect the edge of sheets of A4R.

Horizontal registration sensor 4 (LED4 PTR4)

;used to detect the edge of sheets of B5R.

Punch

Trailing edge sensor

(LED5,PTR5)

Horizontal registration

sensor (LED1-4,PTR1-4)

Punch home position sensor

(FPHPD)

Horizontal registration home

position sensor (FPSHPD)

Horizontal registration motor

(FPSM)

Punch motor (FPNM)

Punch feed motor (FSIFM)

CW rotation

CCW rotation