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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