Hitachi D-550 Serviceanleitung Seite 6

D-550BS, FS, W |
4. Take-up mechanism (Fig. 8)
NRE
What is shown in black is the stop mode : when the playback
button is depressed. the power-assisted control mechanism
operates : the playback plate slides in the direction of arrow
@ as shown in color. whereby the take-up arm rotates in the
direction of arrow Q) :
Since the section. shown by the broken lines. of the take-up
arm is concave, the tip of the take-up gear shaft enters into
this concave portion, and the take-up gear rises in the direction
of arrow Q) by means of the spring and engages with the
take-up side reel.
Since the take-up gear is rotated by the take-up belt. the
rotation in the direction of arrow ® is transmitted to the
take-up reel and the tape is wound on it.
. 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).
Function puttey
——— Stop, fast forward,
Take-up arm
rewind, pause modes
—— == t
i bute --~-- Take-up gear — Playbace node
-—- Take-up reel
Fig. 8
—— Stop, playback. pause modes
—— Rewind mode Eunetion gear (Rewing)
' Function arm
unction gear
Fast forward)
——eicbly reel \ Wroke-up reel
Fig. 9
aes =
ee
L
Function arm
Concave section
Fig. 10
EON ROR IER TRE IEEE EE CER TERI RI TN PIE OA oo ner eee HE
We SORCRR Ne Ore ere wee ew
sane,