MX-FN19, MX-FN20, MX-PN12. All Sections - Sharp Copying Equipment Specification (repair manual). Page 124

MX-FN19  OPERATIONAL DESCRIPTION  6 – 23

The hole puncher is driven by the punch motor (FPNM). The home
position for the hole puncher is detected by the punch home posi-
tion sensor (FPHPD). 
The hole puncher punches a hole when the punch shaft is rotated
180

° from the home position, causing the punch to make a single

round trip. The 2/3-hole type punches a hole, but the circumference
of the punch shaft is divided into two (half for 2-hole and the other
half for 3-hole). Selection of the 2-hole type or 3-hole type depends
on the commands from the host machine.
1) 2-Hole, 4-Hole Type

The home position is identified when the punch home position
sensor is ON. The punching operation for the first sheet ends
when the punch shaft has rotated 180

° and the

punch home position sensor goes ON from OFF; the punching
operation for the second sheet ends when the punch shaft has
rotated 180

° in reverse and the punch home position sensor

goes ON from OFF.
Punch operation in the case of two sheets is as shown below.
a)

A hole is punched along the trailing edge of the 1st sheet.

b)

A hole is made along the trailing edge of the 2nd sheet.

2) 2/3-Hole Type

The home position is identified when the punch home position
sensor is ON. To make two holes, the punching operation for
the first sheet ends when the punch shaft rotates 180

° (half cir-

cumference) and the punch home position sensor goes ON. At
this time, the 3-hole puncher makes a single round trip in
escape direction (moving up the hole puncher) on a half cir-
cumference of the punch shaft. The punching operation for the
second sheet ends when the punch shaft has rotated 180

°

counterclockwise and the punch home position sensor goes
ON.
At this time, the 3-hole puncher makes a single round trip in
escape direction (moving up the hole puncher) on the other
half circumference of the punch shaft. The punching operation
takes place as shown below when making two holes in two
sheets of paper.

a)

A hole is punched along the trailing edge of the 1st sheet.

While two holes are being made, the 3-hole puncher
makes a single round trip in escape direction (moving up
the hole puncher).

b)

Holes are made along the trailing edge of the 2nd sheet.

While two holes are being made, the 3-hole puncher
makes a single round trip in escape direction (moving up
the hole puncher).

Punch home

position sensor (FPHPD) Sensor flag

Punch shaft

Eccentric cam

Die

Die

Hole

puncher

Paper

[punch shaft at rest/

home position]

Waste paper

[punch shaft CW rotation

by 90°/hole made]

[punch shaft CW rotation by 180°/

end of punching operation]

[punch shaft at rest/

home position]

[punch shaft CCW rotation

by 90°/hole made]

[punch shaft CCW rotation by 180°/

end of punching operation]

Punch home

position sensor (FPHPD) Sensor flag

Punch shaft

Eccentric cam

Die

Die

Hole

puncher

Paper

[punch shaft at rest/

home position]

Waste paper

[punch shaft CW rotation

by 90°/hole made]

[punch shaft CW rotation by 180°/

end of punching operation]

[punch shaft at rest/

home position]

[punch shaft CW rotation

by 90°/punch at upper limit]

[punch shaft CW rotation by 180°/

punch back to initial position]

[punch shaft at rest/

home position]

[punch shaft CCW rotation

by 90°/hole made]

[punch shaft CCW rotation by 180°/

end of punching operation]

[punch shaft at rest/

home position]

[punch shaft CCW rotation

by 90°/punch at upper limit]

[punch shaft CCW rotation by 180°/

punch back to initial position]