Ricoh DF40 SPECIFICATIONS

DOCUMENT FEEDER

24 June 1994 SPECIFICATIONS

1. SPECIFICATIONS

Original Size: Maximum: A3 or 11" x 17"

Minimum: A5 Lengthwise or 51/2" x 81/2"
Original Weight: 53 to 105 g/m2 (14 to 28 lb)
Original Feed: Automatic Feed - ADF mode
Original Tray Capacity: 30 sheets - 80 g/m2 (20 lb)
Original Set: Face up - First sheet on top
Original Transport: One flat belt
Copying Speed: 13 copies/min ute

(A4 lengthwise or 81/2" x 11" lengthwise)
Power Consumption: 35 W
Dimensions (W x D x H): 590 x 443 x 100 mm (23.3" x 17.5" x 4.0")
Weight: Approximately 7 kg (15.5 lb)

• Specifications are subject to change without notice.

1

COMPONENT LAYOUT 24 June 1994

2. COMPONENT LAYOUT

2.1 MECHANICAL COMPONENTS

1

234 65

8

910

7

1. Pulse Generator Disk

2. Friction Belt

3. Pick-up Lever

4. Pick-up Roller

5. Original Table

6. Exit Roller

7. Transport Belt

8. Transport Belt Roller

9. Feed Roller

10. Relay Roller

2.2 ELECTRICAL COMPONENTS

45

6

7

3

2

1

8

9

10

12

11

1. Pick-up Solenoid

2. Registration Sensor

3. Original Set Sensor

4. Feed Clutch

5. Pulse Generator Sensor

6. DF Motor

7. Insert Original Indicator

8. Original Misfeed Indica to r

9. Lift Switch

10. DF Main Board

11. DF Transformer

12. DF Interface Board

2

24 June 1994 ELECTRICAL COMPONENT DESCRIPTIONS

3. ELECTRICAL COMPONENT DESCRIPTIONS

SYMBOL NAME FUNCTION LOCATION

Motor

M1 DF Drives all the document feeder components. 6

Solenoid

SOL1 Pick-up Solenoid Energizes to press the pick-up lever against

the stack of originals in preparation for
original feed-in.

Clutch

CL1 Feed Clutch Turns on to transmit main motor rotation to

the feed roller.

Switch

SW1 Lift Switch Informs the CPU when the DF is lifted and

also serves as the misfeed reset switch for
the DF.

Sensors

S1 Pulse Generator

Sensor

S2 Original Set

Sensor

S3 Registration

Sensor

Printed Circuit Board

PCB1 DF Main Board Controls all DF functions. 10
PCB2 DF Interface

Board

Transformer

TR1 DF Transformer Steps down the wall voltage to 25 volts ac. 11

LEDs

LED1 Original Misfeed

Indicator

LED2 Insert Original

Indicator

Supplies timing pulse to the DF main board. 5

Informs the copier CPU that originals have
been placed and causes the Insert Original
indicator to go out.

Sets original stop timing and checks for
original misfeeds.

Interfaces between the copier main board
and the DF.

Turns on when an original is misdeed. 8

Turns off when the originals are inserted into
the original table.

1

4

9

3

2

12

7

3

POWER DISTRIBUTION 24 June 1994

4. POWER DISTRIBUTION

+24 V (VA)

Regulator

+5 V (VC)

Rectifier

AC Drive Board
(PCB2)

115 Vac
220–230 Vac
240 Vac

DF
Transformer
(TR1)

25 Vac

Smooth­ing
Rectifier

DF Main Board (PCB1)

The document feeder uses two dc powe r levels: +24 volts, and +5 volts.
When the main switch is turned on, th e DF t ran sfo rmer receives the wall

outlet ac power thro ugh the ac drive board and output s 2 5 volt s ac to th e DF
main board. Then, the dc power supply circuit on the DF main board con vert s
the 25 volts ac input to +24 volts and +5 volts.

+24 volts is used by the DF moto r, th e pick-up solenoid, and the feed clut ch.
+5 volts is used by other electrical components.

4

24 June 1994 BASIC OPERATION

5. BASIC OPERATION

When the main switch is turned on, the DF CPU sends the "DF installed"
signal to the copier CPU. Receivin g th is sig nal, the copier CPU recognizes
that the document fee de r is inst alle d an d sen ds the "DF confirmed" signal to
the DF CPU.

When originals are placed on the origin al ta ble, the Insert Original ind icat or
turns off and the DF CPU sends the "original set" signal to the copier CPU to
inform that the orig ina ls h ave bee n set .

When the Start key is pressed, the copier CPU sends the "feed-in" signal to
the document feeder. On rece ipt of th is signa l, th e DF CPU e nergizes the DF
motor, the pick-up sole no id, and the fee d clut ch to fee d in th e bo ttom sheet of
the original stack onto the exposu re glass. The pick-up solenoid, and the
feed clutch remain energized until t he origin al’s leading edge reaches the
registration sensor. The DF motor tu rns off shortly after the original’s trailing
edge passes the registration sensor. Then, the DF mo to r pau ses an d
reverses for a moment to alig n th e ed ge of th e original with the scale.

The scanner starts, and the start timing does not depe nd on th e pro gress of
the original through the DF. When the scanner reaches the return position,
the copier CPU sends the "origina l chan ge" sign al to the DF CPU in order to
exchange the current origin al with the next origin al.

5

Fiber Optics
Fiber Optics

INTERFACE CIRCUIT 24 June 1994

6. INTERFACE CIRCUIT

Copier Main Board (PCB1) DF Interface Board (PCB4)

CPU

TXD

RXD

+5V

CN120-2

CN120-5

CN120-4

CN120-1

CN2-1

CN2-4

CN1

CN2-2

CN2-3

DF Main Board (PCB1)

CN118

RXD

CPU

TXD

The copier CPU and the DF CPU communicate via the interface board usin g
fiber optics. The interfa ce bo ard chan ge s the opt ical sign als to electrical
signals (and vice versa).

6

[A]

[D]

24 June 1994 ORIGINAL FEED

7. ORIGINAL FEED

7.1 ORIGINAL PICK-UP MECHANISM

[C]

[B]

After setting the origina ls on th e orig ina l tab le, the origin als con ta ct th e feeler
[A] of the original se t sen sor an d cau se the feeler to move out of th e sensor.
The DF CPU then sends the origina l set signal to the copier CPU to inform it
that the document fee de r will be used . When the Start key is pressed , th e
pick-up solenoid [B] is energized. The original stack is then pressed be twe en
the pick-up lever [C] and pick-up roller [D]. The rota tio n of the pick-up roller
advances the bottom original.

7

[B]

[D]

ORIGINAL FEED 24 June 1994

7.2 ORIGINAL SEPARATION ME CHANI SM

[A]

[C]

[E]

[B]

[D] [C]

[A]

[E]

The feed roller [A] and the friction belt [B] are use d to feed in an d separate
the originals [C]. Only the bottom original is fed beca use the frictio n belt
prevents any other origin als fro m f eeding.

Original feed starts when the pick-up lever [D] presses the original stack and
the rotation of the pick-up roller [E] advances the bo tt om original of the stack.
The feed roller moves the original pa st th e friction belt because the driving
force of the feed roller is greater than the resistan ce of the friction belt. The
friction belt prevents multiple feeds becau se th e resist ance of the frictio n belt
is greater than the friction between original she et s.

8