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5. Fast forward/rewind mechanism
Fig. 9 shows
the fast forward/rewind
mechanism,
which
is
built into the gear assembly ; the black shows the stop mode
and the color shows the rewind mode.
The function gear (Rewind) and the function gear (Fast forward)
rotate in the directions of the arrows
respectively when
the
motor switch is turned ON.
Fig. 10 shows
the Function arm : the section shown in broken
lines is concave and other sections are convex.
By means of
these concave
and convex sections, the height of the function
gear which make contact with this surface is changed, and the
engagement of each reel and function gear can be managed.
Under the stop condition, the function gear, reel and the func-
tion arm are under the mode shown in black in Fig. 11 ; when
the rewind button is depressed, the rewind slider slides in the
direction of arrow
@
as shown in Fig. 12, and the function
arm rotates in the direction of arrow Q
with one end of the
fast forward slider as the fulcrum.
When the function arm is
inclined, the surface where the function arm and the tip of the
shaft of the function gear (Rewind) contact becomes convex as
'shown in color in Fig. 11, and the function gear (Rewind) rises
and engages with the supply reel, and it is then in the rewind
mode.
(Fast forward has the same operational principle as that of
Rewind).
D-720 (W, FS:
—_— Stop, playback, pause modes
——
Rewind mode
Function gear (Rewing)
Function arm
A' . s
oneeeeneriee) i
Supply reel \
\taxe- up reel
Fig.
9
Function arm
Concave section
Fig. 10
——
Stop, playback, pause modes
———
Rewind mode
Function arm
Function gear
(Fast forward)
Fig. 11
i
Fast forward slider
Rewind slider
—
Stop, playback, pause modes
——
Rewind mode
Fig. 12
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