Punch Unit; Adjusting Punching Positions; Punching - Lexmark X95 series Service Manual

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Punch unit

This section describes the media punching operation of the punch.

Two types of punch are provided: the 2/3-hole type and the 2/4-hole type.

The following explains the 2/3-hole type (2-hole/3-hole auto-switching).

Every type has the same construction, except for the sensor (punch hole select) that is provided for the 2-hole

type and 3-hole type only.

The punching positions from the media edge in the direction of feed are determined by gently pressing the

media against the three punch media stopper assemblies.

The three punching positions from the media edge in the direction of media width are determined by the

following method.

• Activate the punch carriage shift motor assembly, and move the punch to the front side until the sensor

(punch carriage shift HP) turns low.

• Reversely rotate the motor, and move the punch to the rear side until the sensor turns high to determine the

home position.

• The punch carriage shift motor assembly is activated to move the punch to the front until the sensor (punch

unit side registration 1) and the sensor (punch unit side registration 2) detects the media edge, and then the

punch is further moved to the front according to the pulse-number determined by the media size. (The

punch carriage shift motor assembly stops at this position.)

Sensor (punch cam front)

Sensor (punch

hole select)

Sensor (punch unit HP)

Sensor (punch unit motor encoder)

After punching positions are determined, the punch unit motor is activated to move the cam plate. With the

movement of the cam plate, the pins descend along the guide holes to punch the media.

This operation is performed for each sheet of media.

The cam plate can lower the pins even while it is moving to the front or rear side.

Service Manual

Sensor (punch carriage shift HP)

Punch unit motor

Punch carriage shift motor assembly

Sensor (punch unit side

registration 2)

Sensor (punch unit side

registration 1)