Rapid-Air CUT-TO-LENGTH WITH MULTI-STROKE - Manual (Page 15)

Cut to Length with Multi Stroke Program
This is a normally open contact from a switch or device that monitors the loop
of material prior to the servo feed. When the material reaches a point that it
trips the switch, a taut stock has been reached. This input, when received,
immediately drops the automatic which stops the feed in progress. The
material should be repositioned in the die before restarting the automatic
sequence, as the progression was lost when the taut stock occurred.
This input also could be used as a “No Stock” switch that would monitor
whether or not there is material available to feed.
B. ANTI-BACKUP INPUT (J52)TB1-8)
Whether the anti-backup rolls where purchased with the unit or came on the
unit standard, they can be activated to raise in the automatic cycle. The anti-
backup rolls, by design, keep the material from sliding back during the pilot
operation. They can become a hindrance if the material tend to walk to one
side or the other during the feed cycle.
The anti-backup switch was designed in for this program. If this problem is
being experienced then a switch or a cam switch with a normally open contact
can be wired in from the press. Usually this switch is activated when the
press is at 180 degrees or when the die is closed to be sure that the material
is being held in position. The rolls will raise for the amount of degrees that the
switch is activated, letting the material reposition itself in line with the die. It is
crucial that this switch is not activated for too long a time because when the
die releases the material, the material will slide back which will cause a
misfeed. This feature has to be used in conjunction with the main rolls being
raised or it will not give the desired results as one of the rolls will be holding
the material from moving.
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