Operators Manual
ALS 221
Release 7/04
Page 16
Labelling
3.2
Starting labelling
For the labelling operation, four adjustments are necessary:
1. The contrast value for detecting the gap between the labels has to be adjusted. By pressing
the contrast key the value changes between 0 and 255. In the display the status of the La-
bel sensor is shown:
G =
G
ap between the labels. The lamp on the Wenglor label sensor is off.
M =
M
aterial in the sensor. The lamp is switched on.
To adjust the contrast of the label sensor do the following steps:
y
Put the label web with a label in the sensor fork. If a printed label is used, select the most
transparent part of the label. This is most the lightest part. A “M” has to be shown in the dis-
play. If this is not the case, press the contrast key until the “M” appears.
y
Press the contrast key until the display change from “M” to “G”. Note the shown value.
y
Put the backing paper without label under the label sensor. If there are water signs in the
backing paper put the most transparent location in the sensor fork.
y
Press the contrast key until the display change from “G” to “M”.
y
Now enter a contrast value in the middle of both measured values.
y
Is the difference between both values greater than 40 the adjustment is not critical. Is the
difference lower than the adjustment has to be done more carefully.
y
By pressing the feed key the setting can be checked. Only one label should be dispensed
and the label should be stop every time at the same position.
The contrast adjustment is only required and possible for the Wenglor label sensor. With
other sensors, the adjustment is done at the sensor. The indicator in the display can be u-
sed for the adjustment.
2. The position of the label at the dispensing edge has to be adjusted by moving the label sen-
sor inside the slot of the dispensing edge.
3. The labelling speed must be adjusted by pressing the keys Speed up or Speed down.
4. The position of the label on the product is defined by 2 factors:
y
Position of the product sensor on your conveyor (basic mechanical adjustment)
y
Start delay value entered by means of the 2 position keys
Æ
The value will be increased. The label is positioned nearer the leading edge of the pro-
duct.
Å
The value will be lower. The label is position nearer the end of the product.
