Reversing Accelerating Control Of Large Size Paper - Canon iR C3380 series Service Manual

* Size: S=LTR (216 mm) or shorter, L=longer than 216 mm
Outlet Paper type
Plain paper
Primary
delivery
Heavy paper
Transparency
Plain paper
Secondary
delivery
Heavy paper
Transparency
Tertiary
Plain paper
delivery
Plain paper
Finisher
Y1/Saddle
finisher
Y2
Heavy paper
Transparency
Plain paper
Finisher
Z1
Heavy paper
Transparency
Duplexing Plain paper
* size: S=LTR (216mm) or shorter, L=longer than 216mm

8.3.4 Reversing Accelerating Control of Large Size Paper

/ / / / iR C3380i / iR C3380 / iR C2880i / iR C2880
This machine executes fixing arch control (details will be explained later at fixing control). In the case of executing reversing of the large size paper, after the paper
leading edge turns on the reversing sensor [2], the paper trailing edge is pulled by fixing, resulting in failure to correctly measure time until the paper stops at the
reversing point.
So, the following controls are performed for reversing the large size paper.
When the paper leading edge turns on the reversing sensor [2], and if the trailing edge point, which is calculated from the paper size, does not pass over the secondary
transfer roller [5] [6] (in the case of executing arch control of fixing), drop the speed of the delivery-2/-3 motors to 135mm/s. Because 135mm/s is the lower speed
for fixing arch control, the paper will not be pulled from the point of the fixing to the reversing. When the trailing edge passes over the secondary transfer roller [5]
[6], the fixing arch control is completed. And then, the fixing speed is returned to 143mm/s, so as the speed of the delivery-2/-3 motors.
Afterwards, the paper feeding speed accelerates to 460mm/s when the trailing edge is at the point of +10mm from the fixing rear roller [4], and starts to decelerate
at the point of 43.8mm from the reversing roller [1] (30mm from the reversing roller = reversing point [3], the distance from when the delivery-3 motor starts at
460mm/s until it completely stops = 13.8mm) to let it stop at the reversing point.
The followings show the timing for reversing accelerating control according to the paper size (after turning on the reversing sensor until the delivery-3 motor is
stopped).
Speed
Size* Acceleration point
(mm/s)
S 337 -
L 337 -
S 71.5 -
L 71.5 -
S 71.5 -
S 460 -
L 460 -
S 71.5 -
L 71.5 -
S 71.5 -
Detect the paper leading
S 460 edge with the reversing
sensor
Detect the paper trailing
edge at 10mm downstream
L 460 of inside delivery roller
(detected with inside
delivery sensor)
S 337 -
L 337 -
S 143 -
L 143 -
S 143 -
S 143 -
L 143 -
S 71.5 -
L 71.5 -
S 71.5 -
Detect the paper leading
S 460 edge with the reversing
sensor
Detect the paper trailing
edge at 10mm downstream
L 460 of inside delivery roller
(detected with inside
delivery sensor)
T-8-5
Delivery-3 motor
Deceleration point
-
-
-
-
-
-
-
-
-
-
Detect the paper trailing
edge at 17.5mm
upperstream of delivery-3
roller (detected by the
delivery 3 sensor)
Detect the paper trailing
edge at 17.5mm
upperstream of delivery-3
roller (detected by the
delivery 3 sensor)
-
-
-
-
-
-
-
-
-
-
N/A
N/A
Buffer motor
Acceleration point Deceleration point
-
-
-
-
-
-
-
-
-
-
-
-
Detect the paper trailing
edge at 10mm downstream
of fixing rear roller N/A
(detected with the inside
delivery sensor)
Detect the paper trailing
edge at 10mm downstream
of fixing rear roller N/A
(detected with the inside
delivery sensor)
Detect the paper leading
edge with the buffer inlet N/A
sensor
Detect the paper leading
edge with the buffer inlet N/A
sensor
Detect the paper leading
edge with the buffer inlet N/A
sensor
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Chapter 8
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0014-5567
8-11