Roland udk20 Manual page 42

Mounting
4.3.3 Spring loaded sensor bracket with flat suction cup
Destacking of blanks is done mostly with the vacuum suction cups. For the measurement of the
sheet thickness the sensors should rest vertically and flat on the sheet. The best contact to the
sheet surface is made by mounting the sensor into a vacuum suction cup.
That suction cups present the sensor vertically to the sheet surface and function fast because of
the low volume of air required. Deviations from the right angle have to be compensated by the
spring-loaded Sensor brackets, otherwise no vacuum can be generated. Bellow style vacuum
suction cups can themselves compensate deviations from the right angle but they can also pull an
inclined sensor to the sheet surface or in inclined sheet to the sensor leading to instability of
measurement. The forces acting in this process can lead to wear and tear to the bracket and lips of
the suction cups. Generating and releasing vacuum requires considerably longer time.
The suction cups are not designed to lift and carry the sheet. In order to prevent inadvertently the
sensor losing touch to the sheet it is necessary to maintain a certain degree of spring load between
sensor and sheet. Sensor cable and vacuum hoses should be mounted in such a fashion that low
angular forces act on the sensor bracket. If necessary the sensor thread can be sealed with a
permanently elastic sealant (Hylomar, Loctite) or a narrow Teflon web.
The spring-loaded sensor bracket contains fixing holes to attach the bracket to the carrying tooling.
In special cases (on request) is an operation without the vacuum cup or the lifting/carrying of the
sheet with the sensor bracket possible.
4.3.3.1 Spring travel of SHS42GS
ausgefedert (Zug)
extracted (pull)
Fig. 12: Spring travel for SHS42GS
42
ROLAND ELECTRONIC GmbH · Otto-Maurer-Str. 17 · DE 75210 Keltern · Phone +49 (0)7236-9392-0 · Fax +49 (0)7236-9392-33
Double Sheet Detector R1000 series UDK20
unbelastet
unstressed
Manual
eingefedert (Druck)
retracted (pressure)
B0048991 / Rev. 1.3