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Example 2:
Calculate the diameter ratio (RT) of the pulley when the rotary encoder is connected to the conveyor via
a pair of pulleys.
<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 (6 scans)]
(Inter-character dot 5 + Space between characters 1)
● Diameter of the conveyor pulley: 60 mm
● Resolution of the rotary encoder: 1,000PPR
(1) Distance the conveyor moves per revolution of the rotary encoder:
60 mm x 3.14 = 188.4 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):
188.4 mm/revolution x 3.33 scans/mm = 628PPR
(4) Diameter ratio of the pulley (RT):
RT = Diameter of the pulley B/Diameter of the pulley A = 1,000PPR/628PPR = About 1.6/1
Diameter of the conveyor pulley
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