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5.1.1 Adjusting the required running speed
In case the required running speed is not achieved with the standard spring assembly, the
current adjustment range of the oscillating system must at first be found out, either natural
frequency below 50 or 100 Hz or natural frequency above 50 or 100 Hz.
For that one or two plates are dismounted from the movable counterweight for a trial. If a
change in the running speed on the conveying track is recognized, it can be taken from the
table below, whether springs must be installed or removed. The controller position at the
control unit may not be changed during this trial. In the factory the different sizes are
equipped.
Change of the
running speed on
the conveying
track after
dismounting the
counterweight
Slower
Faster
The following graphic chart shows the resonance curve of a linear feeder:
When exchanging the springs the valency of the various leaf spring sizes must be considered.
As the spring size enters into the spring power in square, the following examples must be
observed:
-
-
-
A 3.5 mm leaf spring has about the same valency as two 2.5 mm leaf springs. For that
reason, it is recommendable to carry out the final or fine adjustment always with thin leaf
springs.
Part Feeding 7.0 Hopper & Hopper Controller Rev.5
Required running
speed is to be
increased
1.Install counter
weight
2. Dismount
springs
1.Install counter
weight
2. Install springs
The resonance curve of the linear feeder may not correspond
NOTE
to the mains frequency.
2.5 mm spring size = 6.25 spring power
3.0 mm spring size = 9.0 spring power
3.5 mm spring size = 12.25 spring power
Required running
Position of the
speed is to be
natural frequency
reduced
1.Install counter
weight
> 50 or 100 Hz
2. Install springs
1.Install counter
weight
< 50 or 100 Hz
2. Dismount
springs
5. Starting
11
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