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Mechanism viewed from the top
1. As assist gear L rotates, its cam drives the G
point of the cam follower lever in an upward
direction.
2.
As the E point is driven upwards, point F on
the right-hand side of the cam follower lever
starts forcing the switching plate to the left.
3.
As the switching plate is forced to the left,
it carries the G point on the coupling plate to
the left with it.
Fig. 1-20
DIRECTION operation 4
4,
Since the H point on the coupling plate func-
tions as a support point, as the G point is
shifted to the left, the slide plate also moves to
the left with
the two
plates above.
This is
shown in Fig. 1-21.
Assist gear L J
ea
i
!
'
'
!
I
za
a-
1
'
1
Slide plate
Fig. 1-21
DIRECTION
operation 5
5.
As the slide plate moves
from
right to left,
the head rotates to the REV direction attitude.
(Refer to Fig. 1-23)
6.
After assist gear L has turned through about
3/4ths of a revolution, it disengages from the
sub-rotor. Spring pressure forces it back to its
original state, completing the direction opera-
tion, and
switching
the unit
from
REV
to
STOP.
Assist gear L
t
'
1
'
'
'
1
1
Fig. 1-22
DIRECTION operation 5
4.
Head Rotation
As the slide plate moves from right to left in the
direction operation
(described above), the pin on
the sector gear also is forced from right to left.
This is shown in Fig. 1-23. As the sector gear pin
goes past the center point, the force of the gear
spring rotates
the
sector
gear through
approxi-
mately a 90° angle. This causes the head meshed
to sector gear to rotate 180°, placing the unit in
a REV state.
¢
;
eum
Stide plate
Fig. 1-23
Head rotation operation 1
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