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Page 20
LABEL SENSING STAR WHEEL
The star wheel causes the applicator to stop dispensing a label. When the star
wheel is down on a flat side, it will slide over the label until the lead edge of the next
label contacts the point of the wheel causing the wheel to turn over. As it turns up
on a point and back down, the star wheel arm activates a small micro-switch
breaking the circuit, thus stopping the advance of the label web. If the star wheel
arm fails to activate the switch as it turns over the applier will dispense labels
continuously.
NOTE: If the unit is equipped with photoelectric label sensing or a clear label
sensor, the position of the sensors relative to the label is not critical in most cases.
The clear label sensor detects the difference in thickness from the label to the
backing material. Metalized graphics or alphanumeric characters will cause this
sensor to false trigger. Locate the sensor away from the path of metalized material.
Star Wheel Adjustment Procedures
Loosen the two screws (2 and 7), which hold the mounting plate (9) to the mounting
bracket (1). The screw hole (7) is slotted allowing the plate to move toward or away
from the label guide support plate (6). With the star wheel (5) laying flat against the
label web, move the mounting plate (9) in toward the label web as far as it will go.
Then slowly bring it back until the micro-switch (3) activates. (A small “click” will be
heard when this occurs). Tighten the screws (2 and 7) to hold the plate in this
position. To be sure that tightening the screws did not change the position of the
plate, check by raising the star wheel off the label web. A “click” should be heard
when the star wheel is raised and also when it is lowered. A further check should be
made by pulling the label web under the star wheel until it starts to turn up on a
point. A “click” should be heard at this point and also as the star wheel drops back
down onto a flat side. Be sure that the spring (8) is attached to the star wheel arm
(4) as this assures a firm contact of the star wheel to the label.
9
8
7
1
2
3
4
5
6
Fig 18