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_—— Stop, playback, pause modes
——
Rewind mode
Function arm
BA
OTT
uh
Function gear
ti
(Rewind)
Function gear
(Fast forward)
Function belt pulley
Fig. 11
6. Auto-stop mechanism
1) Fig. 13 shows the tape-end detector of the auto-stop mecha-
nism.
Under the recording, playback, fast forward
and rewind
modes, the take-up belt, pulley, gears and cam gears rotate
in the directions of the arrows respectively, and when the
tape is not completely taken up, the take-up reel rotates in
the direction so that it will take-up the tape.
The floating cam is provided on the same axis as the take-up
reel shaft, and it lightly touches the reel by means of the
spring.
Utilizing the face that when the reel rotates, the
floating cam faces in the direction of rotation, the floating
movement of the cam gear and the floating arm, which has
its fulcrum at ®
as shown in Fig. 13, is applied to this
floating cam, to detect the end of the tape.
Method of detecting the tape-end
Shafts, which enter into the cam of the cam gear and the
shaft which
in turn enters into the slide groove
of the
floating cam are provided at both ends of the floating cam ;
the floating movement
is carried out in the direction of
arrow
@
with its fulcrum at ®
as shown
in Fig. 13,
by means of the rotation of the cam gear.
The shaft of the floating arm, which enters into the groove
on the floating cam, operates to slide and relieve the floating
movement which is caused by the cam gear by means of this
groove.
When the cam of the cam gear rotates to the position shown
in color in Fig. 13, the shaft of the floating arm on the floating
cam side goes into the mode shown in @® of Fig. 14.
Next, when the cam gear rotates to the position shown in
black, the position of the shaft on the floating cam side goes
ee
Fest forward slicer
Rewind slider
—— Stop. o:ayback.
pause modes
—
few
-—> mode
Fig. 12
[aye -
|
_Floating cam
7
|
_ @
7
'\Futcrum!
®
v
_
'
Take-up reel
Floating
arm
7
\\ Take-up belt
Fig. 13
into the mode shown in
of Fig. 14 during playback or
fast forward, and
©
during rewind.
These slide grooves
are determined
by the direction
of rotation of the reel.
Incidentally, during pause, since the reel is being stopped,
the auto-stop mechanism starts to operate.
To prevent this,
the floating cam is pressed in the direction of arrow ©
(take-up direction) by the auto-stop control spring as shown
in )
of Fig. 14 during pause and stop.
(The AS (auto-stop) control spring is operated by the sliding
of the brake plate; it is so designed that the AS control
spring is released from one end of the floating cam and the
floating cam faces in the direction of rotation of the reel,
except during the pause and stop modes.)
When the tape is
finished and the reel stops. the floating cam side shaft of the
floating arm slides between
@
and ©
in Fig. 14. This
English
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