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2. Mechanism Operation
2-(1)
Change Cycle Start Mechanism
During play, the relationship between the main gear notch
and the platter spindle gear is as shown in Fig. 1. Since the
projection is apart from the engagement, the main gear is
stationary even when the platter is rotating. As play pro-
ceeds, the arm lever pushes the trip lever and this moves
the
lower trip which,
in turn,
gradually
drives
out the
engagement
mounted
on the lower trip. The relationship
between the engagement and the projection at this time is
as shown in Fig. 2. When the pitch of the record groove is
small, the pitch of engagement advance is also small and
the engagement will be pushed by the projection. The main
gear, therefore, remains stationary.
At the end of play, when the tonearm comes to the lead-
out groove having a larger pitch, the engagement advances
more than the projection pushes it back and their relation-
ship is now as shown in Fig. 3. The projection pushes the
engagement,
the main gear starts to turn, the main gear
notch moves and the platter spindle gear engages with the
main gear. Thus, the change cycle starts as the main gear
starts to turn.
When the main gear stops turning, the relationship shown
in Fig. 1 is restored and the main gear remains stationary
even when the platter spindle gear turns.
On the other hand, the driven out engagement and lower
trip are pushed back to their initial positions by the edge of
the platter spindle gear just before the main gear stops tur-
ning. The cam of the main gear pushes the trip lever back
to its initial position earlier than the engagement and lower
trip. The return position can be fine-adjusted to start earlier
or later by screwing the adjuster.
Projection
Lower Trip
©
a
Platter
Spindle Gear
Engagement
Main Gear Notch
Fig. 1
Fig. 2
Fig. 3
Projection
Main Gear
Arm Lever
Trip Lever
Lower Trip
At the end of play, the main gear turns to move the drive
plate in direction ''a''. Thereby, the elevator cam turns in
direction ''c"' by part
of the case. The elevator is push-
ed up by the sloping part of the elevator cam
to lift the
tonearm.
On the other hand, arm lever stud
contacts the part
of the case and turns in direction ''d'' to return the
tonearm to the rest. Then, the drive plate moves in direc-
tion
''b', and boss
of the off lever is driven by part
of the drive plate with part
of the switch lever
locked by the off lever. The microswitch is thereby turned
OFF and the series of operation ends.
QL-A200
No. 2649
Arm Lever Stud
®
Case
Drive Piate
Tonearm
Shaft
[i 7
NS
Switch Lever
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