Examples and tips
PROGRAMMING MANUAL
298
Revi
si
on 3.0
fig. 60
The speed-time graph shows the steps of the above example. The
steps are:
1. The initial cycle: the slave waits for the right length in the
product to cut (cut_length – distance_to_accelerate / 2). It is
necessary to divide distance_to_accelerate when we use the
MOVELINK
command, because when we synchronize, the
master moves twice the distance of the slave.
2. The slave accelerates to synchronize with the master. When
the acceleration finishes, the relative distance between the
edge of the product and the shear is cut_length.
3. This is the synchronization part: the relative distance between
the edge of the product and the shear remains the same. The
cut in the material is made. This gives a new material edge.
4. The deceleration part: the material continues, and the shear
stops.
5. Move back at high speed: the distances are calculated such
that when the slave reaches it original position, the edge of the
product is in the correct position to start a new cut.A
A new movement starts (step 2).
6.2.9
Correction program
This application is for a rotary labeller. The constants are:
•
The product arrives on a conveyor (master axis) that runs at a
constant speed.
•
A rotary labeller that is synchronized 1:1 to the conveyor,
attaches the labels.
•
The distance between products is fixed and mechanically
guaranteed.
The distance between labels is never exactly constant so, a
correction is needed. This is done by superimposing a virtual axis
onto the movement of the labeller.
SPEED
t
1
2
2
3
4
5
I52E-EN-03.book Seite 298 Freitag, 29. Juni 2007 11:55 11
