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Example 3:
Calculate a rotary encoder resolution required when the pulley installed on the rotary encoder shaft is in
contact with the conveyor belt.
<Calculation condition>
● Dot font: 5 x 7 dots (horizontal 5, vertical 7)
● Space between characters: 1 dot (1 scan)
● Inter-character interval: 1.8 mm [horizontal 6 dots (scans)]
(Inter-character dot 5 + Space between characters 1)
● Diameter of the rotary encoder pulley: 95.5mm
(1) Distance the conveyor moves per revolution of the rotary encoder:
95.5 mm x 3.14 = 300 mm/revolution
(2) Number of scans that must be performed while the conveyor is moving 1 mm:
6 scans/1.8 mm = 3.33 scans/mm
(3) Required number of output pulses from the rotary encoder (resolution):
300 mm/revolution x 3.33 scans/mm = 1,000 PPR
Diameter of the encoder pulley
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