Panasonic KX-W1500

Correct Reel
Drive Cam
Feed Pawl
Slider
Sensor (Reed Switch)
} Daisywheel
Daisywheel Release Lever
Underscore Spoke
4.2.10 Correction Tape Feed
During a correction operation the Motor is energized,
turning the Drive Cam in a clockwise direction approx-
imately 180°, until the magnet passes its sensor (Reed
Switch), at which time it reverses direction and returns
to its home position. The Drive Cam’s rotational move-
ment is changed to vertical movement by the Cam
Follower in the eccentric groove on the back of the
Drive Cam, lifting the Ribbon Holder to its upper posi-
tion. As the Motor lifts the Holder to its upper position,
the tip of the Feed Paw! which pivots on the Slider en-
gages the Feed Gear and continues upward move-
ment causing the Feed Gear to be advanced by one
tooth. The Stop Pawl (leaf spring) prevents reverse
movement of the Correct Reel.
4.2.11 Daisywheel Motor and Character Printing
a) Daisywheel Motor
The Daisywheel Stepping Motor is mounted within the
Carrier frame, and is controlled by the CPU. ~
When a key is depressed, a signal is generated on
the Main Logic Board, energizing the Motor and caus-
ing it to rotate to the desired point, step by step. Each
step of the motor provides for 3.75° or one character
spoke movement of the Daisywheel.
The home position of the Motor corresponds to the
underscore character on the Daisywheel being posi-
tioned at the printing point. In this position, the Impact
Hammer must be aligned with the projection at the
back of the underscore spoke.
Pulling back on the Daisywheel Release Lever pushes
down the Lock bar and moves the Motor away from
the Platen. The Daisywheel Gear shaft and Pilot pin
are disengaged from the Daisywheel, allowing the
Daisywheel to the removed. Upon installation of the
Daisywheel, pushing the lever forward firmly latches
the Motor in the printing position. If the Pilot pin does
not engage in the Pilot hole of the Daisywheel, it will
re-engage automatically when the Carrier returns to
the home position during initialization..
b) Character Printing
Once the Daisywheel has moved to the desired char-
acter, the Hammer Solenoid is energized by the CPU,
causing the Hammer to move rapidly toward the
Daisywheel, driving the character spoke into contact
with the Platen. The strength of this impact is deter-
mined by the length of time the solenoid is energized,
which is automatically controlled by the CPU -corres-
ponding to character surface area.