Radio Shack TRS-80 Service Manual page 46

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Figure 2
4. Pen Drive Mechanism Section
The pen drive mechanism, that ii, the pen up-down mechanism cDmprises a self·holding type electromagnet, ejection
lever, roller
lever, and ball·polni pens. Pen
up
and down directions are
as
shown below.
• Pen·up State
The pen retracts when the suction iron core
is
pulled by
3
current for S ms against the actuator spring of lhe electromagnet,
and
sue1ion
ls
malntained by
a
pennanent magne1
even
aflc r
lhe
eurrcnl is cul off af1er
the
initial
5
ms.
Rubber Roller
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Ptrmenent
M.tgnet
Actu1t0t
Aot.,ion
CtintM
Figurt 3
Pen
R• cording Ptptt
Ejection L.tYer
Actuetor Pin
Actu1tor Rotation
Centtt
Figure 4,
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