Canon iR C3380 series, Service Manual

Page: 273 / 610

Chapter 8
8-11
* Size: S=LTR (216 mm) or shorter, L=longer than 216 mm
T-8-5
* size: S=LTR (216mm) or shorter, L=longer than 216mm
8.3.4 Reversing Accelerating Control of Large Size Paper
0014-5567
/ / / / 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).
Delivery-3 motor Buffer motor
Outlet Paper type Size*
Speed
(mm/s)
Acceleration point Deceleration point Acceleration point Deceleration point
Primary
delivery
Plain paper
S 337 - - - -
L 337 - - - -
Heavy paper
S 71.5 - - - -
L 71.5 - - - -
Transparency S 71.5 - - - -
Secondary
delivery
Plain paper
S 460 - - - -
L 460 - - - -
Heavy paper
S 71.5 - - - -
L 71.5 - - - -
Transparency S 71.5 - - - -
Tertiary
delivery
Plain paper
S 460
Detect the paper leading
edge with the reversing
sensor
Detect the paper trailing
edge at 17.5mm
upperstream of delivery-3
roller (detected by the
delivery 3 sensor)
- -
L 460
Detect the paper trailing
edge at 10mm downstream
of inside delivery roller
(detected with inside
delivery sensor) Detect the paper trailing
edge at 17.5mm
upperstream of delivery-3
roller (detected by the
delivery 3 sensor)
- -
Finisher
Y1/Saddle
finisher
Y2
Plain paper
S 337 - -
Detect the paper trailing
edge at 10mm downstream
of fixing rear roller
(detected with the inside
delivery sensor)
N/A
L 337 - -
Detect the paper trailing
edge at 10mm downstream
of fixing rear roller
(detected with the inside
delivery sensor)
N/A
Heavy paper
S 143 - -
Detect the paper leading
edge with the buffer inlet
sensor
N/A
L 143 - -
Detect the paper leading
edge with the buffer inlet
sensor
N/A
Transparency S 143 - -
Detect the paper leading
edge with the buffer inlet
sensor
N/A
Finisher
Z1
Plain paper
S 143 - - - -
L 143 - - - -
Heavy paper
S 71.5 - - - -
L 71.5 - - - -
Transparency S 71.5 - - - -
Duplexing Plain paper
S 460
Detect the paper leading
edge with the reversing
sensor
N/A - -
L 460
Detect the paper trailing
edge at 10mm downstream
of inside delivery roller
(detected with inside
delivery sensor)
N/A - -