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PC-1500
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4. Pen
Drive
Mechanism
Section
The
pen drive mechanism, namely the pen
up·down
mechanism, comprises a self-holding type
electromagnet, ejection
lever,
roller lever, and baU-point
pens. Pen
up
and
down directions are as
shown
below.
•
Pen-up State
The
pen
retracts
when
the
electromagnet
is enc rgized for 5 ms against the actuator spring,
and
held by a permanent magnet
even
after
the
current is
cut off
after the initial
5
ms.
Rubber
Roller
'\
'
•
Pen-down State
Actuator Pin
Permanent Magnet
Actuator Rotation Center
Fig. 3
Ptn
R
II
r Lever
Recording
Paper
Ejection
lever
Coupling
Leve.,.
Actuator
Pin
Actuator Rotation Otnter
Fig.
4.
From
its pen-up state the pen descends
when
a
current
is impressed to
t
he
electromagnet for 5
ms in
an
opposite
direction to that
used
for pen
retraction.
After 5
ms,
the
pen-down state
will
be main!ained by
!he
actuator spring force.
5. Co lor
Change Mechanism
Section
6
The
color
change
mechanism section
consists
of
the X-direction
drive
mechanism,
a
pen
holder and
holder
stopper,
both in !he
slider unit, and
projeccions inside the
holding
plates. The operating
principles
are explained
below.
Side
Plate
(Lett>
Pulley
Fig.
5
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