HP 2500c Service Manual - Page 132
Gear ratio of Gear-Drive roller/LF Motor Pinion = 60/16*80/20
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Paper Paths and Components Output Transmission Function Line feed Transmission Output Transmission S/No (1) (2) (3) (4) (5) (6) (7) Gear Name Gear-Drive roller Gear 1-LF LF Motor Pinion Gear-OP 1 Gear-Rock Gear-OP2 Gear-OP 3 Number Of Teeth Big Small 80 60 20 16 40 27 31 81 81 Diameter of drive roller = 38.808 mm Diameter of output roller = 19.800mm Gear ratio of Gear-OP3/LF Motor Pinion = (40/16) * (81/27) = 7.5 Gear ratio of Gear-Drive roller/LF Motor Pinion = (60/16)*(80/20) = 15 Gear ratio of Line feed/Output wrt. LF motor = 15/7.5 Linear velocity of output roller/ Linear velocity of drive roller = (15/7.5) *(19.8/38.808) = 1.02 Hence the linear velocity of output roller is 2% faster than drive roller. 6-12 Functional Overview
Functional Overview
6-12
Paper Paths and Components
Output Transmission
Number Of Teeth
Function
S/No
Gear Name
Big
Small
(1)
Gear-Drive roller
80
(2)
Gear 1-LF
60
20
Line feed
Transmission
(3)
LF Motor Pinion
16
(4)
Gear-OP 1
40
27
(5)
Gear-Rock
31
(6)
Gear-OP2
81
Output
Transmission
(7)
Gear-OP 3
81
Diameter of drive roller
= 38.808 mm
Diameter of output roller
= 19.800mm
Gear ratio of Gear-OP3/LF Motor Pinion =
(40/16) * (81/27) =
7.5
Gear ratio of Gear-Drive roller/LF Motor Pinion = (60/16)*(80/20) =
15
Gear ratio of Line feed/Output wrt. LF motor = 15/7.5
Linear velocity of output roller/ Linear velocity of drive roller
= (15/7.5) *(19.8/38.808) = 1.02
Hence the linear velocity of output roller is 2% faster than drive roller.