Ricoh DF20 SPECIFICATIONS

DOCUMENT FEEDER

DF UNIT (20-SHEET)

(C550)

15 November 1995 OVERALL MACHINE INFORMATION

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

Original Type: Sheet-feed
Original Paper Size: Maximum 307 mm x 432 mm (12.0" x 17.0")

Minimum 90 mm x 140 mm (3.6" x 5.5")
Original Weight: 40.7 g/m2 to 127.9 g/m2, 10.8 lb to 34 lb
ADF Original Capacity: 20 sheets (66 g/m2, 17.6 lb) or 1.8 mm height

1.2 MECHANICAL COMPONENT LAYOUT

1

2

1. Original Exit Tray

2. 2nd Original Transport Roller

3. 1st Original Transport Roller

4. Separation Roller

5. Feed Roller

6. Pick-up Roller

3

4

5

6

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1

7

OVERALL MACHINE INFORMATION 15 November 1995

1.3 ELECTRICAL COMPONENT LAYOUT

3

2

4

5

6

1

8

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1. Original Exit Sensor 5. ADF Motor

2. Scan Line Sensor 6. ADF Interface Board

3. Original Registration Sensor 7. Original Width Sensor

4. ADF Cover Sensor 8. Original Set Sensor

COMPONENT DESCRIPTION

Index No. Name Function

1

2

3

4
5 ADF Motor Drives the ADF mechanisms.
6
7 Original Width Sensor Informs the CPU of the original width.
8

Original Exit Sensor Informs the CPU when the original activates the

sensor. Also detects original misfeeds.

Scan Line Sensor Determines the timing for scanning. Also

detects original misfeeds.

Original Registration
Sensor

ADF Cover Sensor Informs the CPU when the ADF cover is

ADF Interface Board Controls the ADF in response to signals from

Original Set Sensor Informs the CPU when an original is placed in

Determines the timing for the ADF motor to
start. Also detects original misfeeds.

opened.

the main body.

the ADF.

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15 November 1995 SECTIONAL DESCRIPTIONS

2. SECTIONAL DESCRIPTIONS

2.1 DRIVE MECHANISM

[G]

[H]

[A]

[F]

[E]

[B]

[D]

[C]

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[D]: Original Set Sensor
[G]: 1st Original Transport Roller

The ADF motor [A] is a stepper motor. The ADF motor rota te s clockwise and
then counterclockwise to fee d th e original. When the Master Making key is
pressed, the ADF motor rotates clockwise to drive the pick-up roller [B] and
the feed roller [C] turns counterclockwise to feed the bott om pa ge of the
original. When the original has been fed 14.5 mm after the original
registration sensor [ F] was act ivated, the ADF motor starts to rotate
counterclockwise. This drives the lower 1st origin al tra nsp ort ro ller [H] and
the lower original exit roller [E] counte rclockwise , feed ing the origin al.

[M]

[N]

[L]

[I]: Original Set Sensor
[J]: Feed Roller
[K]: 1st Original Transport Roller
[L]: Exposure Glass
[M]: 2nd Original Transport Roller

[O]

[K]

[P]

[J]

[Q]

[I]

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[N]: Original Exit Sensor
[O]: Scan Line Sensor
[P]: Original Registration Sensor
[Q]: Separation Roller
[R]: Original Paper Path

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[R]

[F]

SECTIONAL DESCRIPTIONS 15 November 1995

2.2 PAPER FEED AND SEPARATI O N

[E]

[D]

[G]

[H]

[C]

[B]

[A]

[C]

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When the originals are placed on the ADF and the Master Making key is
pressed, the pick-up roller [A] starts to rota te as it is lifted by the spring clutch
[H] to touch the bott om pa ge of th e do cume nt. The original shutter [C] is lifted
by the spring clutch and the lever [G] when the ADF motor is turn ed on. The
separation roller [D] and the feed roller [B] allow only one page int o the
scanner. The one-way clutch on the fe ed roller [E] prevents its backward
rotation when the ADF motor [F] rotates coun terclockwise.

The pick-up and the shu tter torque are adju sta ble by the length of th e sprin g.
See Pick-up Torque and Shutter Torque Adjustment for details.

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[A]

[B]

[C]

15 November 1995 SECTIONAL DESCRIPTIONS

2.3 ORIGINAL SIZE DE TECTI O N

[E]

[D]

[A]: Original Width Senso r-0
[B]: Original Width Senso r-1
[C]: Original Width Sensor-2
[D]: Original Width Sensor-3

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There are 4 sensors (photointe rrupters) for detecting the origina l width . When
the front original guide [E] is shifted to match th e original width, the pla te [F ]
moves with the guide. Eight actuators are installe d on the plat e, and
depending on the side guide position, the sensor status will be changed.

[E]: Front Original Guide

The following table shows the relationship between the paper size and the
sensor status.

Original Size A3 DLT B4 LT/LG A4 B5 A5

Original Size Sensor-0 O O O
Original Size Sensor-1 O O O O
Original Size Sensor-2 OOOO
Original Size Sensor-3 O O O

X= Non-blocked, O= Blocked
* : All of the above original sizes are for len gthwise feed.

2.4 ORIGINAL MISFEED DETECTION

The machine indicate s an original misfeed in the followin g conditions.

• When the original registratio n sen sor do es not go ON within 3 seconds

after the ADF motor starts rotating (clockwise).

• When the scan line sensor doe s not go ON with in 2.5 seconds after the

original registration sensor is turned on.

• When the original exit sensor does not go ON afte r the scan line senso r is

turned on and the original has been fed 60 millimeters.

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SECTIONAL DESCRIPTIONS 15 November 1995

2.5 ADF OPEN/CLOSE DETECTIO N

[A]

[B]

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The ADF set sensor detects whet her t he ADF unit is opened or closed. This
sensor is a reed switch. A magnet mount ed on the ADF [A ] act ivat es th e ree d
switch [B]. When an original is pla ced in the ADF and the Master Making key
is pressed while this sensor d et ect s tha t the ADF is not closed, the mach ine
indicates "CLOSE PLA TEN COVER" on the operation display. The machine
indicates this only when the optional ADF unit is installed.

2.6 ADF POSITION DETECTI ON

[A]

[B]

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When the ADF cover [A] is opened, the plat en cover po sitio n sen sor [B ] is
deactivated. When this sensor is deactivated, the machine indicates "CLOSE
ADF COVER" on the operation display.

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15 November 1995 INSTALLATION PROCEDURE

3. INSTALLATION PROCEDURE

3.1 ACCESSORY CHECK

Decal Kit
Test Chart

Thumb Screws,
Screw and
Toothed Washer

Document Feeder Unit

Make sure that you have all the accesso ries liste d be low.
(1) Document Feeder Unit

(2) Bracket (2 pcs.)
(3) Screw and a Toothed Washer
(4) Thumb Screws (4 pcs.)
(5) Test Chart
(6) Installation Procedure
(7) Decal Kit

Brackets (2 pcs)

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Pin

DF Connector

INSTALLATION PROCEDURE 15 November 1995

[A]

[B]

[C]

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[D]

1. Turn off the main switch an d un plu g the power cord.

2. Open the Platen Cover, remove 4 screws [A] and remove th e Pla ten

Cover.

3. Remove 3 screws [B] and remove the Upper Rear Cover.

4. Remove 2 screws [C] and remove th e cover plate.

5. Let the DF connector through the opening and mount the DF Unit as

shown in the diagram [D].

Pin

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6. Secure the DF Unit by 4 screws that were removed in step 2.

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15 November 1995 INSTALLATION PROCEDURE

[C]

[A]

[B]

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[D]

7. Close the DF and connect the connector to the scanner connector [A].

8. Secure the wire [B] by th e screw an d th e washer in the accessory.

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9. Secure the DF Harness Bracket by 2 screws [C].

10. Replace the Upper Rear Cover by 3 screws.

11. Secure the machine by placing 2 brackets [D] on the back of the table

using 4 thumb screws in the accessory.

CAUTION

I

The brackets must be attached to the back of the table. This is to
prevent the machine from falling over when the ADF is opened.
Also, make sure that the machine is secur ed to the table.

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INSTALLATION PROCEDURE 15 November 1995

When you install the optional ADF, do the following adju stme nt s.

• ADF height adjustment.

• Image center adju stment.

• Image scan magnificatio n adjustment.

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