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Filling ointments, pastes or gels in tubes is a common
task in pharmaceuticals and
cosmetic industry. The tube has to be sealed at proper orientation,
looking at the
print mark. The motor starts and rotates the tube around its own axis. The
mark
sensor activates when the position is proper for sealing. The stepper
motor stops
at this point. The sealing operation is carried out when the motor stops.
Instant start / stop is the unique
property which makes it an ideal application
for stepper motors.
ORION “Tube Orientation Drive”
is a compact and reliable equipment, which
has many optional features to suit the need of machine designer.
1. The motor starts when the start sensor activates. However, for any
reason if
the stop sensor does not activate; the motor may go on rotating. To avoid
this, a
timer can be incorporated which will stop the motor after set time, even
if stop
sensor signal is received.
2. As a solution to the above problem, some people use an alternative
scheme.
They design their cam (the start sensor target) in such a way, that the
signal
remains active for certain fixed time. It is expected that the stop sensor
should
activate during this period. In such case, the motor can be stopped when
the
start sensor de-activates even in absence of stop sensor signal.
3. Some machine builders employing a more supervisory system, need a
signal
from the drive, when motion of the motor ceases. Such output can be
provided
in different ways-
A. Relay change over contact - stay put, as long as motor is stopped
B. Relay change over contact – momentary (preset time)
C. Optocoupler output – stay put
D. Optocoupler output – momentary
E. Solid state output NPN open collector– stay put (Supply external)
F. Solid state output NPN open collector – momentary (Supply external)
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