INSTALLATION
3-9
MA-5151-ENG
PATTERN CONTROLLER STARBI
Location of the peripheral components
Photocell
Basic installation instructions to avoid false readings and allow the adhesive
to be applied from the start of the substrate:
- In general, direct reflection photocells are used (on an object), either in
a standard or optical fibre version.
- It must be positioned in such a way that it detects only the substrate to
be glued. In its absence, there must be no reflective surface that can
activate it.
- The detection distance of each photocell must be taken into account
and its activation margin respected.
- There must be a clear contrast between the substrate to be detected
and the absence of said substrate. For example, a white surface will be
better detected if, in its absence, the existing surface is black.
- To adjust the sensitivity, the existing adjustment control can be
actuated in some photocells. Check the correct mode in the
corresponding manual.
- If the photocell must be placed in the reverse position (with the lens
facing upwards), avoid any light from the installation of the main
machine affecting it. Although most photocells detect infrared light, in
some cases they could be activated accidentally.
- In hot-melt application systems, do not place the photocell very close
to the applicators. The heat they give off can affect and destroy them.
- The distance between the photocell and the applicator (in the line of
movement of the substrate) is decisive when applying some patterns at
high machine speeds.
To use another type of photocell or presence of substrate sensor, consult your
Focke Meler representative or the Focke Meler Main Office.
Encoder
The positioning and length of the lines of application and their precision,
irrespective of any changes in speed of the machine, make it necessary
to consider several factors when placing the encoder, avoiding erroneous
readings or the sliding of the wheel on the conveyor of the substrate:
- The encoder must be placed in a position where it can ‘read’ the speed
of movement of the substrate. Do not place it on ‘transfer’ conveyors
or ‘pressure accumulators’, controlled by motors other than that of the
main conveyor.
- Do not place the encoder on the tension wheels of the wheel treads.
At those points, the belt suffers tensions that change its speed with
respect to the rest of the conveyor.