JVC RC-M60L - Se RD Ee Oe Cee Ee Eee 3; Operating Principle of Full Logic Mechanism

RC-M60L/LB |
Operating Principle of Full-Logic Mechanism
This mechanism is a 2-motor, 1-solenoid full-logic system
which has been developed mainly for low power consump-
tion, and lightweight compactness.
During operation of the RC-M60, the solenoid serves only
as the trigger for switching-over functions. Force for switch-
ing operations is derived from the flywheel gear coaxially
fixed to the flywheel.
To ensure smooth, accurate operation, a small solenoid hav-
ing low power consumption is used; additionally this sole-
noid has a pulling time set for short, middle and long periods
(intermittent operation) which are the basis of all functions
of the RC-M60.
Flywheel
Pause arm
N
aN
\
\
\
|
/
/
7
7
Kick arm
Fig. 2
{ LED
, Phototransistor
Fig. 3
1. When the mechanism operating button is pressed
(power ON), the solenoid is energized, thus attracting
the locked pause arm by spring @.
Solenoid
pulling time
2. When the drive gear is released from the pause arm it is
slightly turned clockwise by spring @) . At this time,
the drive and flywheel gears engage with each other to
transmit the motive power for the switch-over opera-
tion.
NOTE: The flywheel gear, driven by the capstan motor by
a belt, is already rotating when power is ON. Fig. 3
shows the rear side of the drive gear. Here, a
change from black to silver zone is photoelectrical-
ly detected by a LED and phototransistor.
Solenoid Pulling Time (Energizing Time):
@ = Short (when point @ passes the photocoupler)
= Stop, Fast Forward, Rewind
Stop: The reel motor is turned off.
Fast Forward: The reel motor rotates forward.
Rewind: The reel motor rotates reversely.
Middle (when points (@)and(2)) pass the photocoupler)
=> Pause, Cue, Review, Select
Pause: The reel motor is turned off.
Cue, Review, Select: The reel motor rotates
forward or reversely.
Long (when points @) , @) and @) pass the photo-
coupler) = Record, Playback
Record, Playback: The reel motor is turned off.
NOTE: When points @) , @ , @) and @ pass the photo-
coupler = Confirm that the switch-over operation
has been completed.
Each swtich-over operation is completed at one
rotation of the drive gear.
Reel motor
OFF ON
Fast Forward,
Rewind
Pause
Cue, Review,
Select
|
=)
Playback (Record)
Fig. 4
= Block Diagram of RC-M60 full-logic Mechanism Control Circuitry
Mechanism controt logic IC
Operating switches T = =
| ou,
E
lemory os
ae circuit Lt 3 :
Os
Control
Photo-
circuit
Reset
coupler circuit
Drive gear |
Constant voltage/hoiding circuit
Hail element E
Magnet 00 2
No. 1416