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Cassette Mechanism


Semi-auto Cassette
Mechanism Operation Description




AR-2




Technical Support Section, Quality Promotion Department, Audio Division
Contents
page
Mechanism bottom view and part names ................................................... 1
Mechanism top view and part names ......................................................... 2
Drive system............................................................................................... 3
Operation of the main gear from the stop mode to the play mode ............. 4
Switching between forward and reverse during the play mode .................. 5
Operation of the forward/reverse lever and forward/reverse rod ................. 6
Operation of the main gear and forward/reverse lever................................ 6
Head switching operation/Pinch roller switching operation......................... 7
Operational relationship between head substrate and main gear .............. 8
Reel base mode switching operation
(stop, forward-play, and reverse-play modes) ..................................... 9
Relationship between take-up arm, main gear,
and reel base gears (during play mode) .......................................... 10
Reel base switching mode (fast-forward, rewind, and stop modes) ......... 11
Eject operation (stop mode) ..................................................................... 12
Eject operation (cassette cover open) ...................................................... 13
Block diagram ........................................................................................... 14
Timing chart ............................................................................................. 15
Fast Forward (FF) and Rewind (REW) ..................................................... 16
Assembly of parts at top of mechanism ...........................................17 ~ 19
Assembly of parts at bottom of mechanism ..................................... 20 ~ 23
Mechanism bottom view and part names


Switch substrate


13 Take-up lever
7 Plunger (solenoid)

3 Trigger lever
6 Fast-forward 12 Thrust spring
relay gear
2
4 Trigger lever spring 10 Take-up belt
Eject lever
Reel base gear A 9 Take-up arm

1 Forward/reverse lever



Reel base gear B

11 Forward
5 Forward/reverse lever spring
flywheel
8 Main gear Chassis




14 Reverse flywheel
10 Take-up belt




6




7
9


2

4 3
13 14



10 5



11 8
1




--1--
Mechanism top view and part names

Head substrate
Forward/reverse
rod spring

Brake rod




Brake rod spring Forward/reverse rod



Eject rod Play relay gear




Reverse-play
reel base gear Forward-play
reel base gear
Head substrate
return spring

Reverse
capstan Forward capstan




Reverse pinch roller
Forward pinch roller

Head




--2--
Drive system

1. Transmission of the motor's drive force to the two flywheels via the main belt (capstan drive)
* Driving of the main gear (1) For changing mode to stop, forward-play, reverse-play, fast-for-
ward, and rewind
(2) For changing direction of the head and pinch rollers
(3) For raising and lowering the head substrate

2. Transmission of the forward flywheel's drive force to the take-up arm via the take-up belt
* Driving of the reverse and forward reel bases

3. Motor always rotates in the same direction (direction indicated by the arrow).

Take-up arm Motor pulley
Take-up belt




Forward flywheel
Main belt Reverse flywheel




--3--
Operation of the main gear from the stop mode to the play mode


Plunger Trigger lever
Trigger lever boss




Main gear



Trigger spring

Forward flywheel gear




When the plunger is drawn in, the main gear
rotates slightly (the flywheelgear and the main
gear engage).




Drive force of the forward flywheel gear Main gear rotates 120