Ricoh FT4422 DOCUMENT FEEDER
DOCUMENT FEEDER
31 October 1995 SPECIFICATIONS
1. SPECIFICATIONS
Original Size and Weight: – Thin original mode –
Maximum A3/11" x 17"
Minimum B6/51/2" x 81/2"
Weight 41 to 128 g/m2 (11 to 34 lb)
– Thick original mode –
Maximum A3 / 11" x 17"
Minimum B6 / 51/2" x 81/2"
Weight 52 to 128 g/m2 (14 to 34 lb)
– Auto reverse mode –
Maximum A3 / 11" x 17"
Minimum B6 lengthwise /
51/2" x 81/2" lengthwise
Weight 53 to 105 g/m2 (14 to 28 lb)
Original Feed: Automatic feed — ADF mode
Manual feed one by one — SADF mode
Original Table Capacity: 35 sheets / 64 g/m2 (17 lb)
Original Insertion: Face up. First sheet on top
Original Transport: One flat belt
Copy Speed: 20 copies/minute for A4/8 1/2" x 11" sideways
Power Consumption: 20 W
Dimensions (W x D x H): 670 x 460 x 103 mm (26.4" x 18.1" x 4.1")
Weight: Approximately 9.0 kg (19.916 lb)
1
5
COMPONENT LAYOUT 31 October 1995
2. COMPONENT LAYOUT
– Mechanical Components –
23
1
4
6
10
9
8
1. Pulse Generator Disk 6. Inverter Pawl
2. Friction Belt 7. Inverter Roller
3. Pick-up Lever 8. Transport Belt
4. Original Table 9. Pick-up Roller
5. Exit Roller 10. Feed Roller
– Electrical Components –
5
4
3
6
7
8
9
2
1
7
A318V500.img
14
11
13
12
A318V501.img
1. Original Set Sensor 8. Lift Switch
2. Registration Sen sor 9. DF Main Board
3. Pulse Generator Sensor 10. Feed-out Motor
4. Original Width Sensor 11. Inverter Solenoid
5. Pick-up Solenoid 12. Feed-out Sensor
6. Belt Drive Motor 13. Original Select Switch
7. Indicator Panel 14. Feed-in Solenoid
2
10
31 October 1995 ELECTRICAL COMPONENT DESCRIPTIONS
3. ELECTRICAL COMPONENT DESCRIPTIONS
Name Function Index No.
Motors
Belt Drive Motor A DC servomotor that drives the transport belt and
feed-in system (pick-up roller, feed roller, pull-out
roller, and relay roller).
Feed-out Motor A DC servomotor that drives the feed-out unit of the
DF.
Solenoids
Pick-up Solenoid Energizes to press the pick-up lever against the stack
of originals in preparation for original feed-in.
Feed-in Solenoid Turns on to engage the feed-in clutch so rotation is
transmitted to the feed roller, pull-out rollers, and relay
rollers.
Inverter Solenoid Energizes to invert the original when copying
two-sided originals.
6
10
5
14
11
Switches
Lift Switch Informs the CPU when the DF is lifted and also serves
as the jam reset switch for the DF.
Original Select Switch Selects thick original mode or thin original mode. 13
Sensors
Original Set Sensor Informs the copier CPU that originals have been
placed and causes the Insert Original indicator to go
out.
Registration Sensor Sets original stop timing and measures original length. 2
Original Width Sensor Determines the width of the originals. 4
Pulse Generator
Sensor
Feed-out Sensor Checks for original misfeeds and sets original stop
Printed Circuit Boards
DF Main Board Controls all DF functions. 9
Indicator Panel Board Contains operator indicators. 7
Generates pulses used to measure the original length. 3
timing when in auto reverse mode.
8
1
12
3
OVERALL MACHINE CONTROL 31 October 1995
4. OVERALL MACHINE CONTROL
A318D500.wmf
The DF CPU monitors the input signals from the sensors and switch es, and
energizes the solenoids and the indicator LEDs directly. The belt drive motor
and the inverter motor are cont rolled by the DF CPU through their respective
driver ICs. The exchanged signals are shown in the tables on the next page.
4
31 October 1995 OVERALL MACHINE CONTROL
1. DF → Copier
No. Signal Name Definition
1 Original Set Originals have been set on the original table
2 Copy Start Allows the copier to start the copy sequence
3 Lift Up The DF has been lifted
4 DF Misfeed A misfeed has occurred in the DF
2. Copier → DF
No. Signal Name Definition
1 Feed-in Requests the DF to feed in the original
2 Feed-out Requests the DF to feed out the original
3 Invert Original Requests the DF to invert the original
4 Auto Feed Shifts the DF to the auto feed mode
5 Original Stay The was attempted to use the DF but an original from the
previous copy run remains on the exposure glass
5
BASIC OPERATION 31 October 1995
5. BASIC OPERATION
1. One-sided Original Feed
When an original is inserted face up into the DF, the Inse rt Orig inal indicator
light goes out and the DF informs the copier CPU that originals have been set.
When the Start key is pressed, the copier CPU sends the feed-in signal to
the DF. On receipt of this signal, th e DF ene rgize s the pick-up solen oid, the
feed-in solenoid, an d the belt drive motor in order to fe ed in the bot to m shee t
of the original stack onto the exposure glass. The pick-up solenoid and the
feed-in solenoid remain energized until the original’s leading edge reaches
the DF registration sensor. The belt drive moto r t urn s off short ly a ft er th e
original’s trailing edge passes the DF registration sensor.
While feeding the original, the DF registra tio n sen sor and the orig ina l width
sensor check the origina l size.
Just when the origina l trailing edge has passed the DF registra tio n sensor,
the DF CPU sends the copy start signal to th e copier.
When the scanner reaches the return position, the copier CPU sends the
feed-out and the feed-in signals to the DF CPU in order to exchange the
original with the next original. At this time, the scanner be gin s retu rnin g to the
home position.
When the scanner comes to th e ret urn position after scannin g th e last
original, the copier CPU only sen ds th e feed-out signal in order to feed out
the last original.
6
31 October 1995 BASIC OPERATION
2. Two-sided Original Fee d
Unlike one-sided original feed, the back side of the original must be copied
first to keep the originals and copies in the correct order.
During original feed-in, the sequence is the same as fo r one-side d feed ;
however, the DF CPU also energizes the in vert er mot or an d th e inverter
solenoid a short time afte r t he origin al’s trailing edge has passed the DF
registration sensor. The belt drive motor continues to feed the origin al un til
the original’s leading ed ge passe s the fee d-out sensor. At this point the
inverter mechanism inverts the origin al, in prep aration for copying the back
side. Then the belt drive motor reve rses an d th e orig inal is fed towards the
left scale and is aligned against the sca le. The DF CPU se nds the copy sta rt
signal a short time after the origin al’s tra iling edge has passed the feed-out
sensor.
When the scanner reaches the return position, the copier CPU sends the
invert original signal to the DF CPU in order to make a copy of the front side.
The original is inverted in the same way as for back side copying.
3. Semi-automatic Document Feed
If a single original is inserte d int o the original table and cop ied , the DF shifts
to the semi-automatic feed mode and lights the Auto Feed ind icat or. The
Auto Feed indicator remains on for five secon ds after the copier main motor
stops. If another origina l is inserted within that five-second pe riod , it is
automatically fed and copied.
7
ORIGINAL FEED 31 October 1995
6. ORIGINAL FEED
6.1 ORIGINAL PICK-UP
[B]
[C]
[D]
[A]
After the originals have been pla ced on the orig ina l t able, the originals
contact the feeler [A] of the original set sensor and cause the feeler to move
out of the sensor. The DF then sends the origin al set signa l to the cop ier
CPU to inform it that the DF will be used. When the Sta rt key is pressed, the
pick-up solenoid [B] is energized. The original stack is then pressed between
the the pick-up lever [C] and pick-up roller [D]. The rota tio n of the pick-up
roller advances the bottom original.
[A]
A318D501.img
8
[B]
31 October 1995 ORIGINAL FEED
6.2 ORIGINAL SEPARATION
[B]
[A]
A318D502.img
[C]
[A]
A3618D503.img
The feed roller [A] and the friction belt [B] are use d to fee d in and sep ara te
the originals [C]. Only the bottom original is fed because the friction belt
prevents any other origin als fro m f eeding.
Original feed starts when the feed roller starts turning and advances the
bottom original of the stack. The feed roller moves the original past the
friction belt because the driving force of the feed roller is great er than the
resistance of the friction belt . The friction belt prevents multiple feeds
because the resistance of the frict ion belt is great er th an the frictio n be twe en
original sheets.
9
[E]
[C]
ORIGINAL FEED 31 October 1995
6.3 ORIGINAL FEED-IN MECHANIS M
[D]
[G]
[B]
A318D504.img
[A]
[F]
A318D505.img
The belt drive motor [A] drives the pick-up roller [B], the feed ro ller [C] , the
pull out roller [D], the relay roller [E], and tra nsp ort belt [F] via a feed clutch
and a gear train.
The pick-up and feed-in soleno ids are ene rgize d 10 0 milliseco nd s aft er th e
Start key of the copier is pressed. Then 100 milliseconds after the soleno ids
are energized, the belt drive motor starts turning. The pulse genera tor disc
[G] always turns when the belt drive motor is on.
Slightly after the original’s trailing edge passes the reg istra tio n sen sor, the
relay rollers and the transport belt sto p turnin g.
10
31 October 1995 ORIGINAL FEED
This document feed er ha s two dif ferent ways of stopping orig inals at the
correct position on the exposu re gla ss. They are called the "thin original
mode" and the "thick original mode". The mode used is determin ed by the
original select switch [A].
[A]
A318D506.img
– Original Select Switch –
1. Thin Original Mode
The original is stopped at th e correct position on the exposure glass ba sed
on encoder pulse count. The belt drive mot or stops shortly after the original’s
trailing edge passes the DF registra tio n sensor. (Exact timing depends on
registration adjustme nt.) Thin original mode is selected at the factory.
2. Thick Original Mode
When thick original mode is selecte d, the belt drive mot or rema ins en erg ized
for an additional 30 encoder pulses as comp ared to thin original mode. Then,
the belt drive motor pauses and reverse s f or 21 pulse s. This forces the
original against the left scale and thu s align s the edge of the origin al with the
scale.
After the exposu re cycle is completed, the copier send s the fee d-o ut signal to
the DF CPU and the belt drive and feed-out moto rs start turning. At this time,
the copied original f ee ds out an d the next original feeds in.
11
ORIGINAL FEED 31 October 1995
6.4 ORIGINAL SIZE DE TECTI O N
[B]
[A]
A318D507.img
The DF determines original size (bot h widt h and len gt h) th rou gh the use of
the original width sensor [A], registration sensor, and pulse generat or sensor
[B]. The original’s length is calculated by counting the number of pulses from
the pulse generator while th e reg istration sensor is on.
Original size detection is necessary for the feed-in /feed-out timing of the DF.
12
31 October 1995 ORIGINAL FEED
6.5 ORIGINAL INVERSION MECHANI SM
[D]
[C]
[E]
[B]
A318D508.img
1)
[D]
[A]
A318D509.img
Two-sided originals are inve rte d in th e fe ed -ou t un it.
1) When the copier Start key is pressed, the two-side d original is fed into the
feed-in unit, passing over th e DF re gist ration sensor [A]. The fee d-o ut
motor [B] and the inverter sole no id [C] turn on 100 milliseconds after the
original’s trailing edge passes the registratio n sen sor. When the invert er
solenoid turns on, the inverter pawls [D] rotate counterclockwise.
13
Loading...