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PCXWin Software
Theory Of Operation
2
The PCM-22 allows an FX Drive to monitor a product's position (with
respect to its motor position) and produce uniformly spaced cuts or
perforations on the product. The object of Rotary Knife Control is to
cause the follower axis (defined as the rotary knife) to produce one or
more cycles of motion for every cycle of motion produced by the
master axis (defined by an encoder).
Figure 1
PCM-22 Rotary Knife System Example
Referring to Figure 1, in order to maintain proper synchronization
between the two axes, the FX Drive monitors the start points of both
the master and the follower axes. The follower axis will slightly
speed up or slow down as each registration mark passes a sensor. If
both the follower and the master axis are in sync, no speed correction
is made.
The PCM-22 can "learn" new parameters based on sensor
information which allows it to automatically compensate for new
product lengths on the fly. For example, if the distance between
registration marks on the master axis increases from 8.25" to 8.45",
the PCM-22 will adjust the follower axis parameters to compensate
for the increase.
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