Ricoh DS5330 DOCUMENT FEEDER

DOCUMENT FEEDER

1 February 1994 OVERALL MACHINE INFORMATION

1. OVERALL MACHINE INFORMATION

1.1 SPECIFICATIONS

Original Size and Weight: - Thin original mode -

Maximum 11" x 17"/A3 Minimum 5 Weight 11 to 34 lb/41 to 128 g/m

- Thick original mode Maximum 11" x 17"/A3 Minimum 5 Weight 14 to 34 lb/52 to 128 g/m

- Auto reverse mode Maximum 11" x 17"/A3 Minimum 8 Weight 17 to 28 lb/64 to 104 g/m

Original Feed: Automatic feed — ADF mode

Manual feed one by one — SADF mode

" x 8

1/2

" x 8

1/2

" x 11"/A5 sideways

1/2

"/A5 sideways

1/2

"/A5 sideways

1/2

Original Table Capacity: 35 sheets (17 lb/64 g/m2)

Maximum thickness of stacked originals:

3.4 mm Original Set: Face up, front side. First sheet on top. Original Transport: One flat belt Copy Speed: - One sided mode -

20 copies/minute for 8

" x 11"/

1/2

A4 sideways (1 to 1 copy)

- Auto reverse mode -

2 copies/minute for all sizes Power Consumption: 24 W Dimensions (W x D x H): 27.2" x 20.4" x 4.2"/690 x 519 x 107 mm Weight: Approximately 21.4 lb/9.7 kg Nonrecommended Paper: The following types of paper cannot be used

with the DF.

1) Dog-eared, torn, or cre ase d paper

2) Paper with holes larger than 6 mm in

diameter

3) Damp paper

4) Coated paper (carbon paper, thermal

paper, etc.)

Feeder

Document

OVERALL MACHINE INFORMATION 1 February 1994

5) Curled paper

6) Paper with clips or staples

7) Originals that are glued or taped together

8) Bound originals

9) Translucent paper (can be used in SA DF

mode)

1 February 1994 OVERALL MACHINE INFORMATION

1.2 MECHANICAL COMPONENT LAYOUT

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

Feeder

Document

OVERALL MACHINE INFORMATION 1 February 1994

1.3 ELECTRICAL COMPONENT DESCRIPTIONS

SYMBOL NAME FUNCTION LOCATION

Motors

M1 Belt Drive Motor DC servomotor that drives to the transport belt

and feed-in system (pick-up roller, feed roller, pull-out roller and relay roller).

M2 Feed-out Motor DC servomotor that drives the feed-out unit of

the DF.

Solenoids

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

stack of originals in preparation for original feed-in.

SOL2 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.

SOL3 Inverter Solenoid Energizes to invert the original when copying

two sided originals.

SOL4 Stopper

Solenoid

Energizes to down the original stopper of the copier.

Switches

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

serves as the jam reset switch for the DF.

SW2 Original Select

Switch

Sensors

S1 Original Set

Sensor

S2 Registration

Sensor

S3 Original Width

Sensor

S4 Pulse Generator

Sensor

S5 Feed-out Sensor Checks for original misfeeds and sets original

S6 ADF Position

Sensor

Selects thick original mode or thin original mode.

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

Sets original stop timing and measures original length.

Determines the width of the originals. 4

Generates pulses used to measure the original length.

stop timing when in auto reverse mode. Informs the CPU when DF is being closed so

that APS sensor can begin checking the original size.

Printed Circuit Boards

PCB1 DF Main Board Controls all DF functions. 9

1 February 1994 OVERALL MACHINE INFORMATION

PCB2 Indicator Panel

Contains operator indicators. 7

Board

1.4 OVERALL MACHINE CONTROL

Copier Main Board

RXD

TXD

Copier IPU Board

CPU

Serial

-Parallel Comverter

DF Main Board

TXD

RXD

ROM

CPU

Driver IC

Sensors Switches

Solenoids Indicators

Belt Drive Motor

Feed-out Motor

The DF CPU monitors the input signals fr om th e sensors and switches, and energizes the solenoids and the indicator LE Ds direct ly. The belt drive motor and the feed-out motor are controlled by the DF CPU through their respective driver ICs.

Also, the DF CPU communicates with the copier using a serial interface. The exchanged signals are shown in the tables on the next page.

Feeder

Document

OVERALL MACHINE INFORMATION 1 February 1994

1. DF ⇒ Copier

No. Signal Name Definition

1 Original Set Originals are set on the original table. 2 Copy Start Allows the copier to start copy sequence. 3 Lift Up The DF is lifted. 4 DF Misfeed Misfeed occurs 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 or ig ina l . 3 Invert Original Requests the DF to invert the original. 4 Auto Feed Shifts the DF to the auto feed mode.

Original Stay Attempt to use DF but the original from the

previous copy run remains on the exposure glass.

1 February 1994 OVERALL MACHINE INFORMATION

1.5 BASIC OPERATION

1. One-sided Original Feed When an original is inserted into the DF, the Insert Original 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 fe ed-in signal to the

DF. On receipt of this signal, the DF energizes the pick-up solenoid, the feed-in solenoid, and the belt drive motor in order to feed-in the bottom sheet 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 motor turns off 2,088 encoder pulses after the original’s leading edge passes the DF registration sensor.

While feeding the original, the DF regi stra tion sensor and the paper width sensor check the original size.

Shortly before the belt drive motor turns off, the DF CPU sends the copy start signal to the copier. On receipt of the signal, the copier CPU starts the copy cycle.

When the scanner reaches to th e r et urn posit i on , th e cop i er CPU sen ds th e feed-out and the feed-in signals to the DF CPU in order to exchange the original with the next original.

When the scanner comes to the r et urn posit i on aft er scan nin g th e last original, the copier CPU only sends the feed-out signal in order to feed-out the last original.

2. Two-sided Original Feed Unlike one-sided original feed, the back side of the original must be copied

first to keep the originals and cop i es in th e cor rect order. During original feed-in, the sequence is the same as for one-sided feed;

however, the DF CPU also energizes the feed-out motor and the inverter solenoid a short time after the original’s leading edge has passed the DF registration sensor. The belt drive motor continues to feed the original until 140 milliseconds after the original leading’s edge passes the feed-out sensor. At this point the inverter mechanism inverts the original, in preparation for copying the back side. Then the belt drive m ot or reve r ses an d th e or ig ina l is fed towards the original stopper and is stopped at the correct position on the exposure glass. The DF CPU sends the copy start signal a short time after the original’s trailing edge has passed the feed-out sensor.

Feeder

Document

When the scanner reaches to th e r et urn posit i on , th e cop i er CPU sen ds th e 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.

OVERALL MACHINE INFORMATION 1 February 1994

3. Semi-automatic Document Feed If a single original is inserted into th e or ig ina l tab le an d cop i ed , th e DF shifts

to the semi-automatic fe ed mo de and light s the Aut o Fee d ind icator. The Auto Feed indicator remains on for five seconds after the copier main motor stops. If another origina l is inser te d with in th at five-second period, it is automatically fed and copied.

1 February 1994 DETAILED SECTION DESCRIPTION

2. DETAILED SECTION DESCRIPTION

2.1 ORIGINAL FEED

2.1.1 Original Pick-up

[B]

[C]

[A]

After setting the origina l s on the or ig ina l tab le, the originals contact the feele r [A] of the original set sensor an d cau se th e feeler to move out of the sensor. The DF then sends the original set signal to the copier CPU to inform it that the DF will be used. When the Start key is pressed, the pick-up solenoid [B] is energized. The original stack is then pressed between the pick-up lever [C] and pick-up roller [D]. The rotation of the pick-up roller advances the bottom original.

[D]

[A]

Feeder

Document

DETAILED SECTION DESCRIPTION 1 February 1994

2.1.2 Original Separation

[B]

[A]

[B]

[C]

[A]

The feed roller [A] and the friction belt [B] are used to feed-in and separate the originals [C]. Only the bottom original is fed because the friction belt prevents any other originals from feeding.

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 drivin g fo r ce of the feed roller is greater than t he resistance of the friction belt. The friction belt prevents multiple feeds because the resistance of the friction belt is grea ter than the friction between original sheets.

1 February 1994 DETAILED SECTION DESCRIPTION

2.1.3 Original Feed-in Mechanism

[E]

[C]

[D]

[H]

[B]

[G]

[A]

[F]

The belt drive motor [A] drives th e pick- u p rolle r [B] , th e fe ed roller [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 solenoid and feed-i n [G ] solenoids are energized 100 milliseconds after the Start key is pressed. Then 200 milliseconds after the solenoids are energized, the belt drive motor starts turning. The pulse generator disc [H] always turns when the belt drive motor is on.

2,088 encoder pulses of the belt drive motor after the original’s leading edge passes the registration sensor, the relay rollers and the transport belt stop turning.

Feeder

Document

DETAILED SECTION DESCRIPTION 1 February 1994

2.1.4 Original Size Detection

[C]

[B]

[A]

The DF determines original size (both width and length) through the use of the original width sensor [A, rear of DF], registration sensor [A, center of DF], and pulse generator sensor [B]. The original’s length is calculated by counting the number of pulses from the pulse generator [C] while the registration sensor is on.

Original size detection is necessary for the feed-in/feed-out timing of the DF.

1 February 1994 DETAILED SECTION DESCRIPTION

2.1.5 Original Stopping Mechanism

[A]

[B]

- Original Stopper The original stopper [A] is used to align the edge of the original with the right

original scale when the thick original mode is selected. When the thin original mode is selected, the original stopper solenoid [B] is

energized 200 milliseconds afrter the original’s leading edge passes the registration sensor and thus the original stopper is held down until the original is stopped on the exposure glass.

This is to prevent damaging the original’s leading edge against the original stopper.

NOTE: a) Before the original stopper moves down to feed out the original

from the exposure glass, the be lt dr ive motor reverses, pauses slightly, and then turns forward. This is to prevent the original’s leading edge from being caught between the original stopper and the exposure glass.

b) The speed of the belt drive m otor drops to 1,300 rpm f r om 2,500

rpm 1,812 pulses after the original’s leading edge passes the registration sensor. This makes it easier for the mechanism to stop the original at the correct position on th e exp osur e glass.

Feeder

Document

DETAILED SECTION DESCRIPTION 1 February 1994

[A]

- Original Select Switch This document feeder has two dif fe r en t ways of st op pin g orig inal at the

correct position on the exposur e gla ss. The y ar e calle d th e "thin original mode" and the "thick orig ingal mode". The mode used is determined by the original select switch [A].

1. Thin Original Mode The original is stopped at the correct position on the exposure glass based

on encoder pulse count. The belt dr ive m ot or sto ps 2, 088 encoder pulses after the original’s reading edge passes the registration sensor at the one-sided original mode. When the original is inverted in the inverter section, the belt drive motor stops 422 encoder pulses after the original’s trailing edge passes the feed-out sensor. (Exact timing depends on registration adjustment.) Thin original mode is selected at the factory.

2. Thick Original Mode When the thick original mode is selected, the original is aligned against the

original stopper. The belt drive motor stays on 21 encoder pulses longer than when in the thin original mode. When the original is inverted, the belt drive motor continues to reverse for 52 encoder pulses longer than when in the thin original mode, and then turns forward for 188 encoder pulses. This forces the original against the original stopper and th us aligns the edge of the original with the original stopper.

NOTE: The thick original mode should be used when the customer requires

more correct leading edge registration adjustment and/or complains of skewed copies. The thin original mode is to prevent the thin original’s from being bent since they do not have great stiffness.

1 February 1994 DETAILED SECTION DESCRIPTION

2.1.6 Original Inversion Mechanism

[D]

[C]

The two sided originals are inverted in the feed-out unit.

1) When the Start key is

pressed, the two sided original is fed into the feed-in un it, passing over the DF registration sensor [A]. The feed-out motor [B] and the inverter solenoid [C] turn on 200 milliseconds after the original’s leading edge passes the registration sensor. When the inverter solenoid turns on, the inverter pawls [D] rotate counterclockwise.

[B]

[D]

[A]

Feeder

Document

DETAILED SECTION DESCRIPTION 1 February 1994

2) The original is passes over the

exposure glass [A] and feeds into the feed-out unit.

[A]

3) The original is directed onto

the exposure glass again by the inverter pawls. The belt drive motor now reverses 140 milliseconds after the feed out sensor [B] turns on. The transport belt then moves the original toward the original stopper. When the original leading edge reaches the original stopper, the belt drive motor stops. At the same time, the feed-out motor and the inverter solenoid turn off.

4) After the reverse side of the

original is exposed, the belt drive motor, the feed-out motor, and the inver te r solenoid turn on, and the original is fed into the inverter section. (This is the same as step 2 above.)

[B]

5) The original is fed onto the

exposure glass again as in step 3 above. The front side of the original is then copied.

6) After the front side of the

original has been exposed, the original is fed out from the DF.

1 February 1994 DETAILED SECTION DESCRIPTION

2.1.7 Original Feed-out Mechanism

[A]

[D]

[C]

[B]

The exit rollers [A] are driven by inverter motor [B]. When the document feeder receives the feed out signal from the copier, the transport belt and the exit rollers start turning simultaneously. The transport belt carries the original to the inverter rollers [C] and the exit rollers take over the original feed-out. When the original’s trailing edge passes the feed-out sensor [D], the feed-out motor drops to half of its normal speed for 220 milliseconds and then stops. The lower speed prevents uneve n sta cking of originals. For double letter size originals, the feed-out motor speed does not change due to the length of the originals.

Feeder

Document

+ 42 hidden pages