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5. Starting
Spring angle is smaller than the gravity center angle
The force direction of the springs is initiated behind the gravity center of the vibrator.
Consequence: The height amplitude is smaller in the feeding area than in the discharge area.
In case the angles are not the same, the conveying tracks are running unsteadily. In case of
very high deviations of this angle the conveying track can even show lateral deflections
(oscillations).
The gravity centers or angles can be influenced by the following measures:
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The spring angle of the linear feeder's type SLL 400 can be adjusted between 5° and 25°.
If the gravity center angle is outside this area, synchronism of this track is impossible. In
this case modifications must be made at the counter and oscillating weight gravity centers
according to the points listed above.
Spring angle adjustment
Fix the vibrator towards the counter mass (refer to 5.1 Adjustment). After that the four
lateral spring fastenings ("C" + "D") can be loosened, in order to swing the spring assembly
into the desired spring angle. After that fasten the spring fastening screws with the
permissible tightening torque (refer to 1. Technical data) and remove the adjusting screws,
distance plates or bolts.
Adjustment of the magnet air gap
The air gap between armature and magnet adjusted in the factory can be taken from 1.
Technical data.
The adjustment of the air gap can be made from the outside without dismounting any
component parts. Slightly loosen both armatures fastening screws ("A" or "A" + "B") (M5
DIN 912 at linear feeder type SLL 400:). In both bore holes in the oscillating profile ("H")
a round pin (Φ1mm, 80 mm long at SLL400; ) must be stuck through. By pressing both
armature fastening screws against running direction and subsequent tightening the specified
magnetic gap is adjusted (refer to 1. Technical data). After that pull out the round pins. In
case there are no round pins, the magnetic gap can be adjusted from below (perhaps after
dismounting the complete linear feeder from the supporting structure or from the supporting
table) by means of a feeler gauge or distance pieces according to the prescribed magnetic
gap.
14
Add or displace counterweight ("F")
Choose the track position and height in a way that a favorable gravity center is achieved
Keep the track weight as low as possible, in order to keep the vibrator gravity center as
low as possible.
Install an additional counterweight in the vibrator discharge area ("G").
Adjust the spring angle to the gravity center angle
At a turning knob position of 100% at the control unit and a
correctly adjusted magnetic gap the magnet may not dash
NOTE
against the armature.
according to point 5.1 Adjustment (remove springs).
In case this happens, proceed
Part Feeding 7.0 Hopper & Hopper Controller Rev.5
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