Konica Minolta BIZHUB 750 Service Manual page 89

Theory of Operation Ver1.0 Aug.2005
(2) Conveyance of large size paper
The vertical conveyance of the 1st sheet of paper is the same as the conveyance of the small size paper. How-
ever, in the same manner as with the vertical conveyance clutch /1 (CL11), the vertical conveyance clutch /2
(CL12) turns OFF a specified period of time after the registration sensor (PS44) detects the leading edge of the
paper and turns ON [5].
While in the paper feed of the 2nd sheet and succeeding sheets of paper, CL12 turns ON a specified period of
time after a drum ready signal [6] and the vertical conveyance roller /2 conveys [7] the 2nd sheet of paper to the
vertical conveyance roller /1. In this manner, when vertical conveyance sensor /2 (PS26) detects the leading
edge of the paper and turns ON [8], CL12 turns OFF to stand by for paper at the position short of PS26. And a
specified period of time after a drum ready signal is sent, CL11 and CL12 turn ON to resume the vertical con-
veyance [9] of the end sheet of paper.
Paper feed motor (M1)
Vertical conveyance clutch /1 (CL11)
Vertical conveyance clutch /2 (CL12)
Paper feed sensor /3 (PS13)
Vertical conveyance sensor /3 (PS27)
Vertical conveyance sensor /2 (PS26)
Registration sensor (PS44)
[1] Print start signal
[2] Rotation of the vertical conveyance roller /2
[3] Detection of the leading edge of the 1st
sheet of paper
[4] Rotation of the vertical conveyance roller /1
for the 1st sheet of paper
[5] Detection of the leading edge of the 1st
sheet of paper
E. Vertical conveyance of the tray 4 paper
(1) Conveyance of small size paper
Same as "(1) Conveyance of small size paper" of "D. Vertical conveyance of the tray 3 paper." However, the ver-
tical conveyance clutch /2 (CL12) turns ON a specified period of time after the vertical conveyance sensor /4
(PS28) turns ON.
(2) Conveyance of large size paper
Same as "(2) Conveyance of large size paper" of "D. Vertical conveyance of the tray 3 paper." However, while in
the conveyance of the 1 sheet of paper, the vertical conveyance clutch /2 (CL12) turns ON a specified period of
time after the vertical conveyance sensor /4 (PS28) turns ON.
[1] [2] [4] [6]
[3] [5]
17. VERTICAL CONVEYANCE SECTION
[7] [9]
[8] [10]
[6] Drum ready signal
[7] Rotation of the vertical conveyance roller /2
for the 2nd sheet of paper
[8] Detection of the leading edge of the 2nd
sheet of paper
[9] Rotation of the vertical conveyance roller /1
for the 2nd sheet of paper
[10] Detection of the leading edge of the 2nd
sheet of paper
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