just above the beginning of a 7 "plate Because the distance of the P.U. is more than 25 cm (10") plates
and the times used are almost the same, the speed must be different for both cases. If you set the
number of revolutions of the turntable to 33 1/3, then this difference can be observed very clearly.
7.
Horizontal movement of the pick-up arm for the 17.5 cm discs
As we already know, it is necessary to pass discs having a diameter of 7”/ 17.5 cm, that the diameter
device is brought to the position of 17, 5 cm. For this the
small guide hook (112)
comes into operation.
Let us stand at the moment when the pick-up arm is brought from the inside to the outside. This
happens in the normal way already described. The
control disk
continues to rotate at a constant speed
and then encounters the
small guide hook 112
. It turns around its axis. The spring (113) attached to
the end of this hook touches a pin on the large guide hook (
B fig9
) so that it also turns to turn. By the
guiding hook and thus also the PU arm is moved even more inwards. This difference in spinning is
determined by the distance (X Fig. 9). With respect to the
small guide hook
112, the roller rotates
from the inside to the outside and abandons it at a certain moment. Under the influence or torsion
spring (117), this hook goes back and
but
against the diameter device. now the
large guide hook
is no
longer moved, and the pickup arm is just above the edge of a 17.5 cm drive. As the path traveled by
the pick-up arm is larger than for 25 cm discs, and the times spent on it are substantially the same, the
speed must be different in both cases. When setting the speed of the platter to 33 1/3, this difference
in speed is very easy to observe.
P9a
8.
Putting the
control disk into motion
at the end to a disk
In order to achieve this, the drive device/carrier is moved to the main shaft on the control disc just
like when it was
started
. However, this is not happening under the influence of the
starter spring 27 FIG
9.
, but in
a different way
. The driver (
120 FIG 9.
)
FRICTIONALLY
fastened to the
steering hook
111 FIG 9
,
just friction will, as the P.U.ARM is moved inwards through the grooves of the gramophone record,
touching the catch /DRIVER
(127 FIG 9
) on the control disc towards the end of the plate. The latter can
turn completely free around its bearing point and the nose will slowly be turned in the direction of the
main shaft. As long as the needle does not yet run into the outlet groove, the nose must not be touched
by the cam (
D fig. 8
) on the shaft, otherwise the plate would be terminated too soon. To prevent this,
the
fiber disc (128 FIG 9
) should be used. Because this disc is pushed back and forth by the cam on the
shaft at the end of the plate, the nose will not be hit. After the P.U. Once a groove has been turned
inwards, the disc will
get a tap
of the cam on the shaft again and the driver on the
steering hook
will be
pushed back a bit. This continues until the needle enters the outlet groove and causes a large, inwardly
directed
acceleration
of the
steering hook
and thus also the attached driver (
120 FIG 9
). Because of this
fast
movement, the carrier on the
CONTROL DISC
is now also moved
quickly
, so that the nose can now
be hit by the ridge and the
CONTROL DISC
in motion. The
fiber disc
is actually only present, because the
outlet groove does not start at the same distance from the middle of all plates and thus serves to
accommodate these differences.
The accurate setting of the
friction
is important for the timely
switching on of the mechanism
. At the end of the disruption of the
CONTROL DISC
, the catch is pushed
21
Summary of Contents for AG1000
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