Dual 1229 Q - Tonearm Lift and Control Mechanism; Tonearm Lift Operation Details

Fig. 14 Tonearm control mechanism
Tonearm
Movement
151
173
Fig. 15
215
184 203
Adjustment of
tonearm
height
(with tonearm raised )
Cadridge mount
[ 1 1
Cartridge
235 mm
15 / 6 4"
Record
Turntable
platter mat
Turntable platter
Fig. 16 Tonearm
lift with tonearm raised
max.
8 mm
5 / 1 , "
-262
—270
195
255
—257
234
A guide groove
located on the underside
of
the main cam (165) controls
automatic
lift and set—down of
the tonearm as the
cam
rotates
through
360
0
. Tonearm
lift and
lowering are
controlled by the main lever
(184) and the lift
screw (206). Horizontal
movements are controlled by
main lauer (184)
and the
segment (201). Setting the changer
for
playback of 7", 10" or 12" discs is
done
with the indexing lever
(49). Set —down points
are determined by
the eccentric ortion of
the arm
positioning slide (225)
and the in—
dexing lever (267).
Horizontal movement of
the tonearm is limited
by the arm segment
striking the arm
positioning slide (255).
During the
change cycle, the
main lever
(184) raises the
arm positioning slide,
bringing it
within
reach of the spring stud.
On completion
of the change cycle
(set—down
of the tonearm on the record), the arm
po—
sitioning slide (255) is
again released and
returns to its normal
position.
lt thus moves
out of reach of the spring
stud,
permitting the tonearm to move hori—
zontally without hindrance while playing
the
record.
Tonearm
Lift
The tonearm
lift permits
the tonearm to be
set down on the
record safely
at any desired
point
except the shut—off
area (near the
re—
cord label).
Pulling the
tonearm lift control
towards the
front turns the drive cam
(220). This moves
the
connecting lever (270), and
lift screw
(206), to
raise the
tonearm.
After the
tonearm has been moved (by
hand)
to the
desired spot on the record, the
tone —
arm
lift handle is lightly tapped
towards
the rear to release the
mechanism. The con—
necting lever
(270) and spring (205) of the
lift screw (206) are freed, allowing the
tonearm to fall. The rate
of fall is con—
trolled by
silicone oil in the lift tube.
The height
of the stylus above the record
can be varied by
adjusting setscrew (218).
Turning it to the right increases the height,
turning it to the left decreases the height.
Units leaving the factory are
adjusted so
that the tonearm
still lifts reliably off
the fifth record on the platter.
64
220 216
270
10
234
28 201 229 206
184