Akai 1730-SS

V. TRANSPORT MECHANISM
Fig. 1
Braked Rotation
1. CAPSTAN DRIVE
Figure 1.
(A) Motor
(B) Drive Belt (flat belt)
(C) Capstan
(D) Flywheei
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" (4.75 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 Hz
2. PINCH WHEEL DRIVE
The pressure of the pinch wheel as it pushes against
capstan, transports tape between rotating capstan and
pinch wheel at the 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
Turning the RECORD/PLAYBACK LEVER (A) to
“PLAY” position causes the pinch wheel to press against
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) hasa 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 Safety 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 mechanism.
(See figure 2)