Digitronic
Digital Cam Switch Unit
Automationsanlagen GmbH
CamCon DC33/X with 8 programs
A small example in figures was designed to eludicate:
Supposing the drive cylinder with the measuring system has a circumference of 360mm, so that one
millimeter of the circumference corresponds to exactly one angle degree of the measuring system.
The device has the following parameters:
vdroplet
=
20m/s
d
=
20cm
TMV
=
20ms
This results in the following flight time of the droplet:
tFlight =
d
vT
=
0,2m
20m/s
=
10ms
The total delay time is then Tdead, altogether = TMV + tFlight = 20ms + 10ms = 30ms
During this time the paper track moves on by the distance x = vpaper
⋅
Ttotal delay. = 1m/s
⋅
30ms =
30mm. In order to compensate the delay time, the switch point for the magnetic valve must be moved
forward by 30°.
If the speed of the device and consequently that of the paper is doubled vpaper, then the distance x is
also doubled by the speed of the paper track. In this case the switch point must be moved by 60°.
Note:
Please take into account in these explanations that delay time is of a fixed size, which is
determined by the mechanical constants of the set and switch components and by the
dimensions of the construction and therefore does not change!
If the total delay time of 30ms was programmed into the respective output of CamCon, then the glue
droplet would always hit the right spot, regardless of the speed.
Version from: 18.06.2009
Page: 8
