Toshiba DP-5550, Руководство по обслуживанию, Страница: 165 / 404

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PAPER FEEDING SYSTEM
8 - 3
8.2 Functions
1. Pickup roller
These rollers draw out paper from the bypass tray, drawer or tandem LCF and send it to the feed
roller.
2. Feed roller
This roller is placed against the separation roller. It transports paper from the pickup roller to the
transport roller.
3. Separation roller
This roller is placed against the feed roller. When two or more sheets of paper are sent from the
pickup roller, the load of the torque limiter of the separation roller is greater than the frictional force
between the sheets of paper. As the result, the separation roller is stopped and the lower paper is
not advanced any further. When only one sheet of paper is sent from the pickup roller, the
separation roller rotates following the feed roller.
4. Transport roller
This roller transports the paper sent from the feed roller to the intermediate transport roller.
5. Intermediate transport roller
This roller transports the paper sent from the transport roller to the registration roller.
6. Registration roller
The paper sent from the intermediate transport roller is pushed against the registration roller which
aligns the leading edge of paper. Then the registration roller rotates to transport the paper to the
transfer section.
7. Bypass feed sensor (S27)
This sensor detects if paper is set in the bypass tray. If it is, bypass feeding always comes before
drawer feeding.
8. Empty sensor (S31, S37, S43, S49)
This is an emission type sensor and detects the availability of paper in the drawer by using an
actuator. When there is no paper in the drawer, the actuator blocks the light path of the sensor, and
the sensor determines that there is no paper.
9. Feed sensor (S34, S40, S46, S52), Transport sensor (S33, S39, S45, S51)
Feed sensor (S34, 40, 46, 52) detects if the leading edge or trailing edge of paper passed the feed
roller. Transport sensor (S33, 39, 45, 51) detects if the leading edge or trailing edge of paper passed
the transport roller. They also detects jams like misfeeding.
10.Registration sensor (S18)
This sensor detects that the leading edge of paper has reached the registration roller and the trailing
edge of paper has passed the registration roller.
11.Drawer / tandem LCF tray-up sensor (S32, S36, S42, S48)
This sensor detects the tray position when the trays of the drawer and tandem LCF go up.
It detects the amount of sheets placed in the drawer according to the time between when the drawer
bottom sensor (S30, 36, 42, 48) is turned OFF and the drawer tray-up sensor (S32, 38, 44, 50) is
turned ON.
12.Drawer bottom sensor (S30, S36, S42, S48)
This sensor detects the tray bottom position of the drawer.
13.Tandem LCF tray bottom sensor (S71)
It detects the lower limit position (home position) on the LCF tray.