Leuze
electronic
Configuration
Leuze electronic
Technical Description BCL 90
113
T
N
T 35/
7-
24V
9.1.2 Calculating the Starting Position and Deflection Speed for the Forward and
Return Phase of the One-Shot
Line scanner with oscillating mirror
Figure 9.4: One-shot line scanner with oscillating mirror: calculating the number of scans for fence-
type bar codes
A
B
d
x
2
d
x
1
h
o
h
s
v
Theoretical study: frontal reading (object moves towards the BCL)
Data:
h
O
= max. object height
h
S
= distance of the BCL above the transport level
j
= oscillation angle
a
= max. contact angle on the bar code (skew)
Starting phase 1: point A
Starting phase 2: point B
Specifications:
h
S
> h
O
/ a
45° (better:
a
30°)
max. deflection angle setting: ± 20°
• Determine distances by making measure-
ments:
x
1
= distance at starting phase 1
x
2
= distance at starting phase 2
(Scanning direction in the drawing plane)
1. Focus position for distance configuration:
2. Oscillation angle
j
:
3. Deflection speed
j
*
)
:
When entering the values please note:
- Debouncing time of the switched input for the one-shot
- Starting time of the oscillating mirror (mass acceleration)
• Select the deflection speed of the return phase, depend-
ing on the distances between the objects, in such a way
that the scan line returns to the staring position (point A)
in time.
• Check the values determined in theory on location and
make adjustments as required
The oscillating mirror has to cross the angle
D j
in the same
time
D
t, in which the object moves from x
1
to x
2
a
sin
h
s
d
------
d
h
s
a
sin
------------
=
Ã
=
g
90
a
–
=
j g
+
(
)
cos
h
s
h
o
–
(
)
d
------------------------
=
StartPos1
50CW
j
2
---
1 CW
0 5
,
--------------
¼
Í
Ý
Ë
Û
+
=
j
arc
h
s
h
o
–
(
)
d
------------------------
Í
Ý
Ë
Û g
–
cos
=
v
D
x
D
t
-------
D
x
x
1
x
2
–
=
;
=
D
x
v
-------
Dj
j
-------
=
StartPos2
50CW
j
2
---
1 CW
0 5
,
--------------
¼
Í
Ý
Ë
Û
–
=
j
Dj
v
D
x
-------
¼
=
mit1
s
2CW s
=
j
Dj
D
t
-------
=
• enter
j
symmetrically to CW=50:
*
*
*
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