SICK CLV490 Instrucciones de operaciones descargar pdf (Pagina 224)

Chapter 10 Operating Instructions

CLV490 Bar Code Scanner

Appendix

Line scanner with oscillating mirror: fence-type bar code arrangement

Fig. 10-41: Line scanner with oscillating mirror: calculating the number of scans for fence-type bar

code positioning

10°

Line scanner with oscillating mirror: side read on object

Calculation for

standard decoder!

Specified values:

Number of scans n = ?

Conveyer velocity v = 0.5 m/s

Code length with blanc zone l

= 100 mm (3.9 in)

Code length under 10°:

Reading field height l

= 500 mm (19.7 in)

Scanning frequency f = 600 Hz

Bar code 100 % readable, all scans on the code

Code windows = l

- l

1. Dwell time of the bar code

in the reading area:

100 mm

cos 10

-----------------------------102 mm (4 in)==

---=

–()

-----------------------------=

0.5 0.102–()

0.5 m/s

----------------------------------------=

t = 796 ms

----=

0.796 s

-----------------------=

600 Hz

1.26 Hz

----------------------=

----------=

= 1.26 Hz

n = 476

3. Number of possible scans

(rough estimate):

2. Required oscillating mirror

frequency:

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 269 270

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SICK CLV490 Instrucciones de operaciones Pagina 224

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