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1. CAPSTAN DRIVE
Figure 1.
(A) Motor
(B) Drive Belt (flat belt)
(C) Capstan
(D) Flywheel
High-speed rotation of Motor (A) is transmitted by Drive
Belt (B) to Capstan
(C), which
is connected
to a
flywheel that provides necessary inertia. This flywheel
maintains the rated rotation and absorbs minor rotation
variations of the motor.
Capstan Rotation :
606 R.P.M. at 7-1/2" (19 cm) per sec.
303 R.P.M. at 3-3/4" (9,5 cm) per sec.
151.5 R.P.M. at 1-7/8" (4.74 cm) per sec.
Motor Rotation :
3,000 to 1,500 R.P.M. at 50 Hz
3,600 to 1,800 R.P.M. at 60 kHz
2. PINCH WHEEL DRIVE
Place tape between the rotating capstan and pinch
wheel and push pinch wheel
against capstan to
transport the tape at rated speed. The proper pinch
wheel pressure is between 1,000 to 1,150 grams at
the tape speed of 7-1/2" (19 cm) per second.
3. RECORD
AND PLAYBACK MECHANISM
a
Turning
the
RECORD/PLAYBACK
LEVER
(A) to
Gy Fa
O
"PLAY" position causes the pinch wheel to press against
le
N N
the capstan and move the tape at the rated speed. At the
same time, Idler (B) moves between Motor Bushing (C)
and the Take-Up Reel Spindle (D) to transmit the motor
| rotation to (D) so that the tape is moved and wound on
) the
take-up
reel.
The
Take-up
Reel
Spindle
Base,
composed of two plastic wheels (discs) (1 and 2) witha
felt clutch between, is rotated from below by the idler.
Tape-winding friction is adjusted by the slipping of the
felt and maintains rated winding of the tape. The Supply
Reel Spindle (H) has a Brake Roller (E) contacting
plastic wheel
(disc) (4) from below which provides
appropriate
back tension by the slipping of the felt
clutch to the rotation of the Pulley (3) above. To
prevent accidental erasure, the Record Interlock Button
(F) must be depressed before the RECORD/PLAYBACK
LEVER
can be moved to the "REC'' position. Safety
device (G) is depressed to operate the recording mecha-
nism.
2
(See figure 2)
AWWA
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