Ricoh FT5233-S AUTO REVERSE DOCUMENT FEEDER

AUTO REVERSE

DOCUMENT FEEDER

(Machine Code: A497)

12 February 1992 SPECIFICATIONS

1. SPECIFICATIONS

Original Size: Max A3, 11" x 17"

Min B6, 5

Original Weight: 42~128 g/m2 (11~34lb)

-SADF. ADF 52~104 g/m2 (14~28lb)

-SADF. ADF. ARDF

Original Feed Mode: Automatic feed ADF

Manual feed one by one SA DF Auto Reverse Feed ARDF

1/2

" x 8

1/2

Original Table Capacity: Max 50 sheets (A4/8

" x 11)

1/2

52 g/m2 (14lb) Original Separation: Feed and Friction Belts Original Transport: One flat belt Original Stop System: Dc servo motor control system Copying Speed: Continuous copy

33 copies/minute (A4/8

Single copy

31 copies/minute (A4/8 Power Source: 24V from copier, 1.8A Power Consumption: 45W Dimensions

(W x D x H):

670 x 468 x 120 mm (26.4" x 18.5" x 4.8")

Weight: Approximately 9.5 kg (21lb)

" x 11" sideways)

1/2

" x 11" sideways)

1/2

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MECHANICAL COMPONENT LAYOUT 12 February 1992

2. MECHANICAL COMPONENT LAYOUT

1. Pulse Generator Disk

2. Friction Belt

3. Pick-up Lever

4. Original Table

5. Exit Roller

6. Inverter Pawl

7. Inverter Roller

8. Transport Belt

9. Pick-up Roller

10. Feed Roller

12 February 1992 ELECTRICAL COMPONENT LAY OUT

3. ELECTRICAL COMPONENT LAY OUT

1. Original Set Sensor

2. Registration Sensor

3. Pulse Generator Sensor

4. Original Width Sensor

9. DF Main Board

10. Inverter Solenoid

11. Feed-out Motor

12. Feed-out Sensor

5. Pick-up Solenoid

6. Belt Drive Motor

7. Indicator Panel

8. DF Position Sensor

13. Original Select Switch

14. Lift Switch

15. Feed-in Clutch

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ELECTRICAL COMPONENT DESCRIPTIONS 12 February 1992

4. ELECTRICAL COMPONENT DESCRIPTIONS

MOTORS

NAME FUNCTION LOCATION

DC servomotor that drives to the transport

Belt Drive Motor

Feed-out Motor

SOLENOIDS

NAME FUNCTION LOCATION

Pick-up Solenoid

Inverter Solenoid

belt and feed-in system (pick-up roller, feed roller, pull-out roller and relay roller). DC servomotor that drives the feed-out unit of the DF.

Energizes to press the pick-up lever against the stack of originals in preparation for original feed-in. Energizes to invert the original when copying two sided originals.

SWITCHES

NAME FUNCTION LOCATION

Lift Switch

Original Select Switch

Informs the CPU when the DF is lifted and also serves as the jam reset switch for the DF. Selects thick original mode or thin original mode.

12 February 1992 ELECTRICAL COMPONENT DESCRIPTIONS

SENSORS

NAME FUNCTION LOCATION

Original Set Sensor

Registration Sensor Original Width Sensor

DF Position Sensor

Pulse Generator Sensor

Informs the main system’s 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 Informs the CPU when DF is being closed

so that APS sensor can begin checking the original size. Generates pulses used to measure the original length.

Checks for original misfeeds and sets

Feed-out Sensor

original stop timing when in auto reverse

mode.

MAGNETIC CLUTCH

NAME FUNCTION LOCATION

Feed-in Clutch

Energizes to rotate the feed roller, pull-out rollers, and relay roller

PRINTED CIRCUIT BOARDS

NAME FUNCTION LOCATION DF Main Board Controls all DF functions. 9 Indicator Panel Board

Contains operator indicators. 7

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BASIC OPERATION 12 February 1992

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 main system’s CPU that originals have been set.

When the Start key is pressed, the main system’s CPU sends the feed-in signal to the DF. On receipt of this signal, the DF energizes the pick-up solenoid, the feed-in clutch, 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 clutch 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 registration sensor and the original width sensor check the original size.

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

When the scanner reaches to the return position, the main system’s CPU sends the feed-out and the feed -in signals to the DF CPU in order to exchange the original with the ne xt or ig ina l .

When the scanner comes to the r et urn posit i on aft er scan nin g th e last original, the main system’s 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 85 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 motor reverses and the original 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.

12 February 1992 BASIC OPERATION

When the scanner reaches to the return position, the main system’s 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 inserted into th e or ig ina l tab le an d cop i ed , th e DF shifts

to the semi-automatic feed mode and lights the Auto Feed indicator. The Auto Feed indicator remains on for four seconds after the main system’s main motor stops. If another original is inserted within that fo ur - se cond period, it is automatically fed an d copied.

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ORIGINAL FEED 12 February 1992

6. ORIGINAL FEED

6.1 ORIGINAL PICK-UP

[A]

[C]

[B]

[D]

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 main system’s 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.

12 February 1992 ORIGINAL FEED

6.2 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 the 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.

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ORIGINAL FEED 12 February 1992

6.3 ORIGINAL FEED-IN MECHANISM

[D]

[F]

[C]

[B]

[A]

[F]

The belt drive motor [A] drives th e pick- u p rolle r [B] , th e fe ed roller [C], and transport belt [D] via a feed clut ch an d a ge ar tr a in. And, the pull out roller [E] is driven by friction with the feed ro ller.

[E]

The pick-up solenoid is energized 100 milliseconds after the Start key is pressed. Then 100 milliseconds after the solenoid is energized, the belt drive motor starts turning. The pulse generator disc [F] on the pull-out roller shaft always turns when the belt drive motor is on in the forward direction.

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

12 February 1992 ORIGINAL FEED

6.4 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.

The original width sensor is turned on when the original width is 204 mm (8") or more. It is in the same position (front to back) as the original width sensor in the copier.

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

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ORIGINAL FEED 12 February 1992

6.5 ORIGINAL SELECT SWITCH

[A]

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 inal mode". The mode used is det er m ined 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. For the first side of the original, the belt drive motor stops 238 encoder pulses after the original’s trailing edge passes the registration sensor in the one-sided original mode. For the reverse side of the original, the belt drive motor reverses its rotation 85 m sec after the leading edge passes the feed-out sens or. It stops after 2805 pulses. (Exact timing depends on registration adjustment.) Thin original mode is selecte d at the factory.

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

original scale. For the first side, the belt drive motor stays on 36 encoder pulses longer than when in the thin original mode, and then reverses for 62 encoder pulses. This forces the original against the original scale and thus aligns the edge of the original with the original scale.

For the reverse side, the belt drive motor continues to reverse for 62 encoder pulses longer than when in the thin original mode.

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

requires more correct leading edge registration adjustment or when these are complaints of skewed copies. The thin original mode is to prevent the thin original’s from being bent since they do not have great stiffness.

12 February 1992 ORIGINAL FEED

6.6 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]. At the same time, the feed-out motor [B] starts turning

The inverter solenoid [C] turns on 100 milliseconds after the original’s trailing edge passes the registration sensor

When the inverter solenoid turns on, the inverter pawls [D] rotate counterclockwise.

[B]

[D]

[A]

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ORIGINAL FEED 12 February 1992

2) The original 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 85 milliseconds after the feed out sensor [B] turns on. The transport belt then moves the original toward the original scale. When the original leading edge reaches the original scale, 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.

12 February 1992 ORIGINAL FEED

6.7 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 main system, 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 350 milliseconds and then stops. The lower speed prevents uneven stacking of originals. For A3 or double letter size originals, the feed-out motor speed does not change due to the length of the originals.

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LIFT MECHANISM 12 February 1992

7. LIFT MECHANISM

[D]

[F]

[A]

[B]

[A]

[C]

[B]

[E]

When the document feeder is opened, the lift springs [D] provide enough force to ensure that the document feeder does not fall onto the exposure glass. When the document feeder is closed, points [A], [B], and [C] are aligned and no such force is provided to the document feeder.

The lift switch is actuated when the document feeder is closed. The main system then shifts to the document feeder mode. The lift switch also serves as the reset switch for document feeder misfeeds.

When a book or thick original (maximum thickness 60 mm) is copied, the DF acts as a cover for the original as shown in the figure [E]. The lift switch is turned off during this condition, so the DF does not function. The tension of spring [F] returns the DF to the normal condition after copying a thick original.

12 February 1992 ORIGINAL MISFEED SENSING

8. ORIGINAL MISFEED SENSING

The main system’s CPU lights the original misfeed indicator if the previous original remains on the exposure glass after manual copying and DF feed is attempted. When the DF is lifted and the previous original is removed, DF copying is permitted. The registration sensor and the feed-out sensor are used for misfeed checks.

The functions of the two sensors are as follows:

8.1 ONE-SIDED ORIGINAL

Registration Sensor

ON check (540 ms)

Feed-out Sensor

OFF check (780 ms)

ON check (780 ms)

Belt Drive Motor

Feed-out Motor

OFF check (780 ms)

If the registration sensor is not actuated within 540 milliseconds after the belt drive motor starts turning, the Original Misfeed indicator lights (ON check). If the registration sensor does not turn off within 780 milliseconds, the CPU determines that there has been an original misfeed (OFF check). The Original Misfeed indicator also lights if the feed-out sensor is not actuated within 780 milliseconds after the belt drive motor starts turning forward (ON check), or if the feed-out sensor does not turn off within 780 milliseconds after the feed-out sensor turns on (OFF check).

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