SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 37)

Operating Instructions Chapter 4

CLV 490 Bar Code Scanner

8 008 796/0000/25-06-2002

4-5

Installation

Angular alignment of the CLV

The alignment of the CLV is optimum when the scan line travels over the bar code lines

almost at a right angle (90

) (

Fig. 4-4

). All possible reading angles that can occur between

the scan line and the bar code must be taken into consideration (

Fig. 4-6

and

Table 4-1

Avoiding surface reflection

If the light from the scan line strikes the surface of the bar code vertically, interference may

be caused by reflections when the returned light is received. To avoid surface reflection, the

CLV must be mounted in such a way that the emitted light is tilted slightly with respect to the

vertical axis (

Fig. 4-7

In the case of the line scanner with oscillating mirror, the laser beam is emitted at an angle

of 105

with respect to the housing as it passes through the neutral position (CW = 50) whi-

le oscillating. The device can only be flush-mounted with the conveyor belt with limited de-

flection ranges. Otherwise, the device must also be mounted at an angle of 15

to ensure

that the deflection ranges are symmetric.

Fig. 4-6: Line scanner: Reading angle between the scan line and the bar code

CLV

α:

Azimuth angle (tilt)

β:

Angle of inclination (pitch)

γ:

Angle of rotation (skew)

Reading

range

Reading

distance

Angle Limit value

Tilt

(azimuth) max. 45

Pitch

max. 45

Skew

max. 45

Table 4-1: Permissible reading angles between the scan line and bar code

Fig. 4-7: Avoiding surface reflections: Angle between the emitted light and the bar code (tilted

away from the vertical axis)

15°

Line scanner Line scanner with oscillating mirror

(Top view) (Side view)

15°

105°

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SICK CLV490 Instrucciones de operaciones Pagina 37

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