Ricoh DH400 SPECIFICATIONS
RECIRCULATING DOCUMENT
HANDLER
(Machine Code: A378)
23 April 1993 SPECIFICATIONS
1. SPECIFICATIONS
Original Size: Max A3, 11" x 17"
Min A5 lengthwise, 5 1/2 " x 8 1/2"
(No A5 Sideways, 8 1/2 x 5 1/2)
Original Weight: 52~104 g/m
2
(14~28 lb) (ARF)
52~128 g/m2 (14~34 lb) (ADF)
Original Feed Mode: Automatic Feed (ADF)
Automatic Recycle Feed (ARF)
Original Capacity: Max 50 sheets (A4, 8 1/2" x 11")
Original Separation: Feed and Friction Belts system
Original Transport: One flat belt
Original Stop System: DC servo motor control system
Copying Speed: Continuous copy
55 cpm (A4S, 11" x 81/2", 1st feed station)
Single copy
55 cpm (A4S, 11" x 8 1/2", 1st feed statio n)
Number of Cycles
Max 30 times
per Document:
Power Source: 24V (from copier), 5 A
Power Consumption: 70W
Dimensions:
(W x D x H)
645 x 516 x 132 millimeters
(25.4 x 20.4 x 5.2 inches)
Weight: Approximately 18 kg (39.7 lb)
RDH
1
11
MECHANICAL COMPONENT LAYOUT 23 April 1993
2. MECHANICAL COMPONENT LAYOUT
1
13 12
1. Friction Belts
2. Feed Roller
3. Original Gate
2
34 56 7 8 9
10
8. Exit Relay Belts
9. Inverter Pawls
10. Inverter Roller
4. Pick-up Rollers
5. Original Stacker
6. Push-plate
7. Feed-out Rollers
11. Transport Belt
12. Pull-out Roller
13. Pulse Generator
2
23 April 1993 ELECTRICAL COMPONENT DESCRIPTIONS
3. ELECTRICAL COMPONENT DESCRIPTIONS
Symbol Name Function
Motors
M1 Feed-in Motor Drives the feed-in system
(pick-up rollers, feed roller, and
pull-out roller). (dc servo)
M2 Transport Belt Motor Drives the transport belt. (dc
servo)
M3 Inverter Motor Drives the inverter roller and the
exit relay belts.
M4 Feed-out Motor Drives the feed-out unit. 15
M5 Friction Belt Motor Drives the friction belts 21
Solenoids
SOL1 Original Gate
Solenoid
SOL2 Inverter Solenoid E nergizes to invert the original
Energizes to open the orig ina l
gate.
when copying a two-sided
original.
Index
No.
3
4
9
22
8
SOL3 Push Plate Solenoid Energizes to push the stack of
originals to the feed-in section.
Switches
SW1 Lift Switch Informs the copier CPU when the
RDH is lifted and also serves as
the jam reset switch for the RDH.
SW2 Feed-in Unit Safety
Switch
SW3 Feed-out Unit Safety
Switch
Detects if the feed-in unit is set
correctly.
Detects if the feed-out unit is set
correctly.
14
7
23
10
RDH
3
ELECTRICAL COMPONENT DESCRIPTIONS 23 April 1993
Symbol Name Function
Sensors
S1 Original Set Sensor Informs the copie r CP U tha t
originals have been placed and
causes the Insert Origin al
indicator to go out.
S2 Recycle Sensor Informs the CPU when the top
original is fed from the original
stacker.
S3 Registration Sensor Sets original stop timing and
measures the original’s length.
S4 Original Width
Sensor
S5 Pulse Generator
Sensor
Determines the width of the
original.
Generates the pu lses use d to
measure the original’s length.
S6 Inverter Sensor Sets original stop timing when in
auto reverse mode.
Index
No.
17
19
17
20
1
11
S7 Feed-out Sensor Checks for original misfeeds. 13
S8 One Turn Sensor Informs the CPU when the
pick-up roller turns one rotation.
S9 RDH Position Sensor Informs the CPU when the RDH
is being closed so that APS
sensor can begin checking the
16
original size.
Magnetic Clutch +
CL1 Feed-in clutch Energizes to rotate the feed roller. 2
Printed Circuit Boards
PCB1 RDH Main PCB Con tro ls all RDH funct ion s. 12
PCB2 Indicator Pane l PCB Contains indicators for t he
operator.
6
5
4
23 April 1993 BASIC OPERATION
4. BASIC OPERATION
4.1 ONE-SIDED ORIGINAL FEED
When an original is placed in the RDH, the Set Original indicator goes out
and the RDH informs the copier that originals have been set.
When the Start key is pressed, the copier CPU sends the feed-in signal to the
RDH. On receipt of this signal, the gate solenoid turn s on, ope nin g the
original gate. At the same time the push-plate solenoid and the feed-in motor
turn on. The push-plate an d pick-u p rolle rs mo ve th e en tire stack of originals
to the feed posit ion .
After that, the feed-in mot or sta rts tu rnin g ag ain . The bot to m origin al is f ed in
by the feed roller and the friction belts and de livere d to the exposure glass by
the transport belt.
After a very short period, th e seco nd origin al is also fe d in un til its lea ding
edge reaches the regist rat ion sensor. This is in preparatio n fo r t he next copy
cycle.
When the scanner reaches the return position, the copier CPU sends the
feed-out and the feed-in signals to the RDH in order to feed in the second
original. If the first original is A4/Letter size (side ways fe ed) or smaller, it is
not fed out as the next original is transported to the exposure glass. It is just
moved to the right side of th e exp osure glass. After completing the second
scan, the third original is fed in and the first original is fed out from the unit.
This continues until all origina ls have bee n cop ied .
The originals are stacked on the original table where they wait for the next
copy cycle.
4.2 TWO-SIDED ORIGINAL FEED
Unlike one-sided original feed, the back-side of the orig ina l must be copied
first to keep the originals and copies in correct order.
During original feed-in, the sequence is the same as fo r one-side d feed ;
however, the RDH CPU also energizes the feed-out motor and the inverter
solenoid a short time afte r t he origin al’s leading edge has passed the RDH
registration sensor. The transport belt motor continues to feed the original
until the inverter mechanism inverts the original for the back-side copying.
Then, the transport belt moto r re verse s to feed the origin al towards the scale,
and stops the original at the correct posit ion on the exposure glass.
RDH
When the scanner reaches the return position, the copier CPU sends the
feed-out signal to the RDH CPU. The RDH then inverts the original in th e
same way as for back-side copying .
5
FEED-IN DRIVE MECHANISM 23 April 1993
5. FEED-IN DRIVE MECHANISM
[A]
[D]
[B]
[E]
The pick-up rollers [A], feed roller [B], and the pull-o ut rollers [C] are drive n by
the feed-in motor [D] through the timing belt, th e gears and the feed-in clutch
[E].
[C]
-Basic OperationThe feed-in motor is a reversible dc motor. When the feed-in moto r rota tes
forward (counterclockwise), all the rollers turn in the original fee d dire ctio n.
(The feed roller can rotate only when the feed-in clutch is on. )
When the feed-in motor reverses, the pick-up rolle rs stop. However, the feed
roller and the pull-out rolle rs co nt inue turning in the same direct ion.
Roller(s) Feed-in Motor
Forward Reverse
Pick-up
Feed
Pull-out
(* Only when the feed-in clutch turns on, the feed roller rotates.)
On
On/Off
On
Off
On/Off
On
6
23 April 1993 FEED-IN DRIVE MECHANISM
[G]
[F]
[H]
[I]
[J]
[K]
[L]
When the Start Key is pressed, th e fe ed -in mot or sta rts turning
counterclockwise. Drive is transferred to the pick-up rolle rs thro ug h gears [E ]
and [G] and to the feed-in clutch throu gh gears [H] an d [J] . The timing of the
feed roller rotation is controlled by the feed-in clut ch [K ].
Next, the feed-in motor reverses (clockwise). The pick-up rollers stop turning
due to the one-way bearing inside the gears [F] an d [H] . However, the feed
roller continues turning in the same direction through gears [H], [I], [J], [L],
and the feed-in clutch.
Since the pull-out roller is insta lled on th e sha ft of gear [H], the pull-out roller
always turns in the original feed direction whene ver the feed -in mot or is
turned on.
RDH
7
[A]
ONE-TURN SENSOR 23 April 1993
6. ONE-TURN SENSOR
[B]
The one-turn senso r [A] is loca te d at the rear end of the pick-up roller sha ft. It
counts the rotations of the pick-up rollers.
Every 360o, the notch [B] in the one-turn disk retu rns to the one-turn sensor
and the sensor turns on.
When feeding an original, the RDH CPU monitors the rotatio n of the pick-up
rollers through this sensor. It always stops the rollers with their flat surfaces
facing up.
8
23 April 1993 ORIGINAL SETTING FOR RECYCLE
7. ORIGINAL SETTING FOR RECYCLE
[A]
[B]
When the Start Key is pressed , the original gate solenoid [A] is energized to
open the original gat e. At th e same time, the push plate soleno id [B] is
energized and the pick-up rollers start turning. The pick-up rollers and the
push plate move the ent ire sta ck of originals to the feed-in sect ion .
At this time, the originals turn the recycle sensor on. After th at, th e orig ina ls
are fed one by one from the bot to m o f th e stack. The recycle sensor stays on
until the last original is fed.
The copied originals are fed out from the fe ed-out unit onto the original
stacker where they wait for the next cycle.
When the last original is fed in fro m the feed-in section, the recycle sensor
turns off. This informs the RDH CPU that all the originals have been fed in for
the first set of copies.
Soon after the last original passes the recycle sensor, the original gate is
opened again and the push plate and the pick-u p rolle rs mo ve the sta ck of
originals to the feed-in section for the secon d cycle. This is the pre-stacking
cycle. However, the last few origin als of the first cycle ha ve not fe d out yet, at
this moment. In order to set them o n the pre-stacked originals, the origin al
gate, and the push plate are energized again after the last original is fed out.
RDH
This recycle system increases the to tal copy productivity to 55 cpm for A4, or
8 1/2"x11" originals (sideways feed and 100% reproduction ratio).
9
ORIGINAL FEED-IN 23 April 1993
8. ORIGINAL FEED-IN
(1)
(2)
(3)
One-turn Sensor
(1)
Registration Sensor
Feed-in MC
(1)
Feed-in Motor
Transport Belt
Motor
Friction Belt
Motor
(2)
(2)
(2)
(2)
50m sec
(3)
(3)
100ms
Soon after the entire stack of the originals are move d to the fee d-in position
(1), the feed-in clutch and the friction belt moto r turn on. The frict ion belt
motor rotates for 50 milliseconds count er to the direct ion of the feed roller
rotation to ensure the separation of the bottom original (2).
When the leading edge of the original reaches the registration sensor, the
feed-in clutch turns off and the feed-in motor reverses (3). From this time
onward, the pull-out rollers ta ke ove r and feed th e orig ina l to th e transport
section.
The registration sen sor also serves to measure the original length. The RDH
CPU determines the origina l size by counting how many pulses it receives
while the original passe s t he se nso r.
The original width is checked by the origin al width sensor, which is located
next to the registration sen sor.
The original stop position is determined by pulse cou nt from the time the
original trailing edge passes the registratio n sen sor.
10
Loading...