JPS63277154A - Automatic original conveyor - Google Patents

Abstract

PURPOSE:To feed two sheets of originals accurately onto a platen in succession as well as to stop them at the specified position in a series state by installing a conveyor control device which stops these two originals registered of the rear end and the tip at the specified position in a parallel state. CONSTITUTION:An original is loaded on an original tray 111 in turning its image face downward and it is delivering piece by piece. When a two-sheet feed mode is selected, the first original is passed through register members (pinch rollers 121 and 122) installed in place short of a platen and then it is fed back by a conveyor belt 125, and a rear end of this original is registered by these rollers 121 and 122. Simultaneously the second original is fed and a tip of this original is registered by these rollers 121 and 122 as well. With this constitution, two sheets of originals are set in a continuous state in a series manner via these rollers 121 and 122, and from this state, these two originals are conveyed to the specified position on the platen by the conveyor belt 125.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic document feeder attached to an image forming apparatus such as a copying machine, and particularly to a control mechanism for document feed.

Problems with the Prior Art In recent years, automatic document feeders (hereinafter referred to as ADF) have been developed in order to shorten the time required for exchanging originals out of the time required for copying and to omit the troublesome effort of exchanging originals.
Various types of copying machines have been developed and put into practical use. If this type of ADF is a way to reduce the indirect costs (time and effort) related to copying, the direct costs (consumables such as copy paper and toner) can be reduced by converting two originals into one copy paper on both sides. There are methods such as double-sided copying, in which two originals are copied onto one side of copy paper the size of one original (two-original single-sided copying), and the like. In the former case, double-sided copying requires only one sheet of copy paper, but requires two sheets of toner. On the other hand, the latter one-sided copying of two originals is economical since only one sheet of copy paper and toner is required. Furthermore, by combining the two, it is possible to copy four originals onto both sides of one sheet of copy paper, which is extremely economical.

By the way, various ADFs that have been provided so far are
The originals are conveyed one by one onto the platen glass, and in order to make single-sided copies of two originals, the operator must line up the originals one by one on the glass platen, which does not improve the time and effort required. .

As improvements to these measures, the following patent publications have been proposed, but all of them have various problems. That is, Japanese Patent Publication No. 56-25657 discloses an ADF that feeds two original documents side by side onto an original platen glass. However, this requires time and effort to sect the originals into the original tray in parallel, and to rearrange the pages of the originals even after the originals are ejected. Moreover, the ADF requires space in the depth direction, that is, in the direction orthogonal to the conveyance direction, and the copying machine itself becomes larger.

Also, Japanese Patent Application Laid-Open No. 60-2942, No. 60-8494
Publication No. 5 discloses an ADF in which two conveyor belts are arranged side by side in the conveyance direction on a glass platen, and two originals can be set in series on the glass platen. However, this has the problem that when the original is thin, the shadow between the two conveyor belts is imprinted on the copy paper.

Kirani, Japanese Patent Laid-Open No. 60-93462 discloses a method in which two originals are fed in series using so-called trailing feeding, in which the second original is fed in succession to the first original in the original handling section. The ADF, which can be set on the document platen glass, is fully exposed. However, with the trailing feeding method, reliable document feeding cannot be expected, and it is difficult to put it into practical use in terms of reliability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an automatic document feeder that can reliably feed two documents continuously onto a platen and stop them in series at a predetermined position.

In order to solve the above-mentioned problems, the automatic document feeder according to the present invention includes: (1) a document feeding unit that feeds the documents placed on the document tray one by one; , (i) a document transport section having a transport belt that stops the document fed from the document feed section at a predetermined position on the platen, and discharges the document from the platen after the exposure operation is completed; A resist member installed in the conveyance path between the feeding section and the platen and capable of registering the leading or trailing edge of the document; (■) The resisting member registers the leading edge of the document sent from the document feeding section (V) after the document sent out from the document feeding section passes through the registration member, the document is reversely conveyed on the conveyor belt and its trailing edge is registered with the registration member; After registering the trailing edge of the first document using the edge registration control means and (■) trailing edge registration control means, the leading edge registration control means registers the leading edge of the second document. The present invention is characterized by comprising: a conveyance control means for stopping two documents whose leading edges are registered in a juxtaposed state at a predetermined position on a platen.

In the 1-month or more configuration, the originals are stacked on the original tray of the original feeding unit with the image side facing down, and are sent out one by one. After the first document passes through a resist member provided in front of the platen, it is conveyed backward by a conveyor belt, and the rear end of the document is registered with the resist member. At the same time, the second document is completely fed and the leading edge of the document is registered by the registration member. With this, the two originals are set in a serially continuous state via the resist member, and from that state
A sheet of original is conveyed to a predetermined position on a platen by a conveyance heddle and stopped.

Embodiments of an automatic document feeder (ADF) according to the present invention will be described below with reference to the accompanying drawings. This ADF is installed on the top surface of the copying machine main body (1), and first, an outline of the copying machine will be explained.

[Schematic structure and operation of copying machine] In Fig. 1, the copying machine main body (1) is installed on the paper refeeding path box (60), the paper feeding section is on the left, and the duplex/combining unit (70) is on the right. ) and a sorter (90) are installed.

A photoreceptor drum (10
) is installed so that it can be rotated in the direction of arrow (a) at a constant circumferential speed l1 (V). Around this photoreceptor drum (10), a main eraser (11) and a charger (1
2), sub eraser (13), magnetic brush type developing device (14), transfer charger (15), sheet separation charger (16), blade type cleaning device (17)
) are arranged sequentially. The photosensitive drum (10) has a well-known photosensitive layer on its surface, and as it rotates in the direction of arrow (a), a main eraser (10) is applied for each copy.
1), charger (12), sub eraser (13)
The optical system (20
), and the electrostatic latent image formed on the surface is separated into a toner image by a developing device (14).

The optical system (20) is installed below the document table glass (19) so that the document image can be scanned, and includes an exposure lamp (21),
It consists of a first mirror (22), a second mirror (23), a third mirror (24), a projection lens (25), and a fourth mirror (26).N light lamp (21) and the first mirror (22) is an integral block, and the photoreceptor drum (
The second mirror ( 23) and the third mirror (24) are integrally formed into a block and can be moved in the direction of arrow (b) at a speed of (V/2m).In addition, when changing the copying magnification, the lens (25) moves on the optical axis, and the fourth mirror (26) moves and swings to correct the optical path.

Copy paper is stored in a fixed automatic paper feed unit (30) and a removable automatic paper feed cassette (35) installed on the left side of the copying machine body (1). roller(
31) and (36) are selectively rotated to feed sheets one by one. Further, the upper surface of the cassette (30) is cut off with a manual paper feed section (32), from which copy sheets can be fed one by one. The copy paper fed from the cassette 7<30> and its manual paper feed section (32) is conveyed through a pair of transport rollers (33) to a pair of timing rollers (40), and then fed from the cassette (35). The copied paper is directly conveyed to the timing roller (40), where it is temporarily on standby. For copy paper, use timing rollers (4
0), it is sent to the transfer section in synchronization with the image formed on the surface of the photoreceptor drum (10) and comes into close contact with the photoreceptor drum (10), and is caused by the corona discharge of the transfer charger (15). The toner image is transferred to a separate charger (16)
The sheet is separated from the photoreceptor drum (10) by the alternating current corona discharge and the strength of the sheet itself. Thereafter, the copy paper is sucked onto a conveyor belt (41) equipped with an air suction means (42) and fed into a fixing device (43), where the toner image is fixed, and then discharged from a pair of discharge rollers (44). be done.

On the other hand, the photosensitive drum (10) after the transfer is cleaned! (17) The main eraser (11) removes the toner and charge remaining on the surface, and prepares for the next copying process.

[Detection of copy paper size] There are micro switches (SWI) to (SW4) in the paper feed section.
), (SW5), (SW6) to (SW9), (0 for S
) has been installed.

Switch (S-ken 1) ~ (51/4), (S-ken 6) ~ (S
Cassettes I-(35) and (30) are turned on and off according to the position of the copy paper width regulating plate, etc., and the cassettes I-(35) and (30) are turned on and off based on the combination of on and off. )
Vertical to the size and paper feed direction of the copy paper loaded.

Detects which direction it is installed horizontally.

The sizes that can be copied with this copying machine, that is, the sizes of copy sheets that can be set in each cassette (30) and (35), are, for example, [A3], [A4], [A5], and [A6].

[B11. [B11. [B6, [A4], [A
5 pieces.

[For B11, vertical or horizontal can be selected. Further, the switches (SWI) to (SW4) also detect attachment and detachment of the cassette (35). Table 1 below shows an example of a code table using switches (S$J1) to (S$J4). In this table 1, the on state of the switch is represented as 10", and the off state is represented as 11", and when all the switches are off, it means that the cassette (35) is not installed in the paper feed section. In addition, Ima-gumi's switch (Sen 6)
~ (SW9) also performs similar detection.

Also, a micro switch (SW5) is provided in each paper feed section.

(swtO> is a cassette <35), (30
) directly detects the presence or absence of copy paper.

[The following is a margin] [1 table [Mechanism and sheet feeding for double-sided/composite copying] The duplex/composite unit (70) generally consists of a first switching claw (71), a second
switching claw (72) and ejection roller (73).

(74), conveyance rollers (75), (76), guide plates located around them and forming a conveyance path, and a paper refeeding device (80).
) is installed.

The paper refeeding device (80) is a removable paper refeeding cassette (81).
), the pickup roller (85) is used for both sheet storage and re-feeding, a storage roller (86) that contacts and rotates driven by the roller (85), a feeding roller (87),
It is equipped with a Sabaki roller (88). Re-feed cassette (
81) is a bottom plate (82a) that can rotate around the rear end (82a).
82), and the bottom plate (82) is rotatable from the dotted line position to the solid line position by a push-up mechanism (not shown).

The paper refeeding path box (60) has a conveyor roller pair (61)
.

(62), (63) and guide plates located around them to form a seat passage. The sheet sent out from the unit (70) is conveyed by a pair of conveyance rollers (61), (62), (63), and passed through the guide plates (48), (49) of the copying machine main body (1). It is conveyed to the timing roller pair (40).

Paper passing modes in the duplex/combining unit (70) include a discharge mode, a duplex copying mode, and a composite copying mode, and the paper passing mode in each mode is a switching claw (71).

It is changed by switching the position of (72).

That is, in the ejection mode, the switching claw (71) is set to the dotted line position in FIG. 1, and the copy paper can be ejected to the sorter bin (91). In double-sided copy mode, a switching claw (71);
(72) is set at the solid line position, and the copy paper that has been copied on one side is fed into the paper refeed cassette (81) as described above. In the composite copy mode, the switching claw (72) is set to the dotted line position, and the copy paper that has been copied on one side is immediately conveyed to the paper refeed path box (60).

[Automatic document feeder (ADF) configuration and operation code A D
F (100) is generally a document feeding section (110);
It is composed of a document transport section (120) and a document discharge section (130), and can be opened upward as a whole with the back as a fulcrum. Therefore, as shown in Fig. 1, this A D F (100) is set on the document platen glass (19), and the document is read one by one or two documents in succession as explained below. In addition to automatically transporting the document and setting it in a predetermined position on the document glass (19), the operator can lift the document upward and place it on the document glass (19). Copying can be performed by placing the printer in one place. The opening and closing of the ADF (100) is detected by a switch (PSW) (see Figure 7), and this detection signal causes the ADF (100) and the copying machine body (
1) and controls are associated with each other.

The document feeding section (110) includes a document tray (111), a pickup roller (112), a forward rotation roller (113) and a reverse rotation roller (114) for brushing the document, and each roller (112), ( 113) and (114), and a document detection sensor (SEL).
It is equipped with. The document tray (111) has a slide plate (not shown) that positions the document in the width direction. The original is completely set on the -C original tray (111) with the image side facing down, and this state is detected by the sensor (SEI).

The pickup roller (112) is movable up and down, and is normally waiting at the top. g manuscript is in the original tray (111)
When the sensor (SEI) is turned on and the ADF start switch (SSW) (see Figure 7) is turned on during operation, the pickup roller (112) descends and presses against the top surface of the document, and , feeds the top layer original by rotating.

The normal rotation roller m3) rotates in the document feeding direction, and the reverse rotation roller (11
4) can be rotationally driven in the document return direction, and as mentioned above, along with the pickup roller (112), both rollers (11
3), (114) are driven to rotate, and only the upper layer of the original is transferred to the original transport unit (1) by the rotation of the normal rotation roller (113).
20), and the lower document is sent to the reversing roller (114).
) can be returned to the original tray (111).

The document transport section (120) has pinch rollers (121), (
122) and its drive motor (123) (see FIG. 2), a conveyor belt (125) and its drive motor (not shown), W, precision detection - t=sensor (SE2), (SE3
).

The conveyor belt (125) has support rollers (126a), (
126b) in an endless manner, and the presser roller (
127) in contact with the original platen glass (19〉),
It can be driven forward and backward in the direction of arrow (C).

That is, when the sensor (SE2) detects the leading edge of the document sent out from the document feeding section (110), the rotation of the pickup roller (112), forward/reverse rollers (113), and (114) starts with a slight time delay. The document is stopped, and the leading edge of the document comes into contact with the nip portion of the pinch rollers (121), <122), forming a loop on the upstream side thereof. This will correct the skew of the original.

Furthermore, the original is placed on pinch rollers (121) and (122).
rotation and the direction of the arrow (c) of the conveyor belt (125) -5
The document is conveyed onto the document table glass (19) by normal rotation. Stopping of the document is controlled by setting a timer when the trailing edge of the document is detected by the sensor (SE2), and stopping normal rotation of the conveyor belt (125) when the timer expires. With this, the original can be stopped at a predetermined position on the original table glass (19).

Here, from A D F (100) to the copying machine body (1)
A copying operation start signal is output to the copying machine main body (1).
The copy operation starts. and the optical system (20)
When the image exposure scanning for the set number of sheets is completed, a document exchange signal is output from the copying machine main body (1) to the ADF (100). At this signal, the conveyor belt (125
) is driven forward in the direction of arrow (c), and the original is ejected.

By the way, as shown in Fig. 2, the length of the original is determined by the disc (1) fixed to the spindle (121a) of the pinch roller (121).
24) can be measured using the pulse signal from the sensor (SE5) based on the rotation. That is, the output of the sensor (SE5) is sent to the sensor (SE2) that detects the passage of the original and the pinch roller (1).
21) and is input to the second microcomputer (202) (see Fig. 7), and the number of pulses is counted while the original passes through the sensor (SE2). , the manuscript is getting a long signal.

Further, the width of the document can be detected by one classification by the sensor (SE3). In this example, this sensor (SE3) is [A
4], [BS] is set in a position where it is detected (on) when the document is fed in a horizontal orientation, and is not detected (off) when it is fed in a vertical orientation. As a result, [A 4 ], [A 5 co, [
B4], [B6], etc., and whether they are vertical or horizontal are identified.

The document ejection section (130) has ejection rollers (131), (1
32) and (133), (134), the surrounding guide plate, the discharge tray (135), and each roller (131) to
(134) drive motor (not shown) and a document detection sensor (SE4).

When the optical system (20) completes the image exposure scanning of the number of copies and a document exchange signal is output from the copying machine main body (1), the transport bell l- (125) is driven in normal rotation and the roller ( 131) to (i34) are driven to rotate, and the original is ejected from the original platen glass (19) to the ejection tray (135). The document ejecting operation is stopped after a certain period of time from the document trailing edge detection signal from the sensor (SE4), that is, when the document is accommodated on the discharge tray (135).

Furthermore, when the document trailing edge detection signal from the sensor (SE4) is generated, the presence or absence of the document on the document tray (111) is determined based on the signal from the sensor (SEI), and if the document is set, the Repeat the document feeding, stopping, and ejecting operations.

[Operation in 2-sheet original feeding mode] In this embodiment, A D F (100) feeds 1 original.
Place the sheets one by one in the specified position on the document table glass (19),
In addition to the normal single-sheet feeding mode in which the image is exposed and scanned and then ejected, two originals are successively fed onto the original platen glass (19) and set in series at a predetermined position.
It is possible to select a two-sheet feed mode in which the image is ejected after exposure scanning is completed.

(i) Original Feeding Operation The original feeding operation when the two-sheet feeding mode is selected will be described below with reference to FIGS. 3a to 31.

The 2-sheet feed mode is selected, and the ADF start switch (
When SSM) is turned on, the originals stacked on the original tray (ttl) are fed from the topmost original (Dl) by the rotation of the pickup roller (112), and as described above, the originals stacked on the original tray (ttl) are fed by the rotation of the forward/reverse roller (113). , (114) and sent out from the feeding section (110) (see Fig. 3a).

The leading edge of the first document (Dl) sent out in this manner comes into contact with the nip portion of the pinch rollers (121) and (122), and forms a loop on the tlE side (see Fig. 3b).

Hereinafter, this process will be referred to as tip resist process.

Next, the pinch rollers (121) and (122) are driven to rotate, and the conveyor belt <125) is driven to rotate forward in the direction of arrow (c), so that the document is placed on the document table glass (19).
) (see Figure 3c).

After that, the rear end of the document (Dl) is moved to the pinch roller (121).
.

(122), pinch roller (121),
(122) and the rotation of the conveyor belt (125) is stopped (see Figure 3d).

Next, the conveyor belt (125) is reversely driven in the direction of the arrow (C''), and the rear end of the document (Dl) is moved to the pinch roller (121).
.

(122) Stop with the nip in contact (
(See Figure 3e). Hereinafter, this process will be referred to as trailing edge registration process.

While the first document (Dl) has been processed with trailing edge registration, the second document (D2) is transferred from the document tray (111).
), and perform the tip resist processing (see FIG. 3g). With this, two manuscripts <D
i>, (D2) is the pinch roller (121), (12
In step 2), the rear end and the leading end are registered and placed side by side for quick reading.

In this state, the pinch rollers (121), (122) and the conveyor belt (125) are driven to rotate normally, and the original (Di) is
, (D2) onto the document table glass (19) at the same time (see Fig. 3h). The rear end of the second document (D2) is at a predetermined position on the document table glass (19), that is, the optical system (2o
), the pinch roller (12
1), (122) and the rotational drive of the conveyor belt (125) are stopped (see Fig. 31), so that the two originals (Di>, (D2)) are consecutively placed in series in the conveyance direction. The documents can be set in a predetermined position on the document table glass (19) in a lined state.

(i) In the two-sheet feed mode, which is more than the original ejection operation, the two originals are placed side by side without any gaps. You will have to push the rear end,
There is a possibility that the alignment or page alignment on the output tray (135) may be disturbed.

Therefore, in the two-sheet feed mode, two originals are ejected onto the ejection tray (135) with an interval between them to ensure alignment of the originals on the ejection tray (135).

There are two methods for such document ejection processing.

In the first document ejection process, the first document is
31>, after reaching (132), the conveyor belt (12
5), stop normal rotation, and place the second document on the document glass (
19) This is a method in which the conveyor belt (125) is allowed to rotate forward again after the conveyor belt (125) is placed on standby and an appropriate distance is created between the two.

Specifically, the conveyance belt (125) is driven to rotate forward in response to the document exchange signal, and the discharge rollers (131) to (134) are driven to rotate forward.
) (see Figure 4a). With this, the manuscript (
Di >, (D2) begins to be ejected in the direction of arrow (c), and when the leading edge of the first document (Dl) is detected by the sensor (SE4), the conveyance bell! - Stop the forward rotation of (125) (see Figure 4b). From this state, the first document (
Dl) continues to discharge rollers (131) to (134)
The second document (D2) is transported on the document table glass (
19) Wait at the top and leave a space between them (
(See Figures 40 and 4d).

When the edge of the first document (Dl) is detected by the sensor (SE4>), the conveyor belt (125) is again driven in normal rotation (see Figure 4c), and the two documents (DI), ( D2) are discharged onto the discharge tray (135) at appropriate intervals.

On the other hand, the second document ejection process is carried out by the ejection roller (134)
(134) The document transport speed is determined by the transport belt (125).
In this method, the document conveyance speed is set higher than the original document conveyance speed, and an appropriate distance is left between two documents.

Specifically, the transport belt (125) is driven to rotate in the normal direction based on the document ejection signal, and the ejection rollers (131) to (134)
) (see Figure 5a). At this time, the document conveyance speed by the discharge rollers (131) to (134) is set higher than the document conveyance speed by the conveyor belt (125). As a result, the distance between the originals (Di) and (D2) gradually increases (see Figures 5b and 5c), resulting in 2
The sheets of originals (Di >, (D2)) are ejected onto the ejection tray (135) at appropriate intervals.

Note that the upstream ejection rollers (131>, (132) may be set to the same document transport speed as the transport bell 1-(125). In this case, the ejection rollers (131>, (132))
(132) is a discharge roller (133) with a high conveyance speed.
, (134), when the document is conveyed, it is configured to rotate as a result of the conveyance of the document.

[Single-sheet feeding when two-sheet feeding mode is selected By the way, when the above two-sheet feeding mode is selected, if the total number of y@documents is an odd number, two sheets are fed as a set. Eventually, only one manuscript will exist.

Therefore, one final document is fed and sent to the sensor (SEL).
), when the document empty signal is output, the final document is processed in the single-sheet feeding mode.

[Automatic optimum magnification setting function (AMS)] Next, with this copier, when the operator specifies the copy paper size and document size, the document image can be transferred to the copier of the selected size without causing any image loss. It has an automatic optimum magnification setting function (hereinafter referred to as AMS) that automatically sets the RR copy magnification that can be completed.

When this AMS mode is selected, the second CPU (202
), the document size is determined, the code is complete, and the first CP
It is sent to U (201). 1st CPU (201>
calculates the optimum copy magnification from the original size code and the size code of the copy paper set in the cassettes (30) and (35) selected by the operator, and makes sure that the calculated copy magnification is within the specs of the copier. If so, set the copy magnification. On the other hand, if it is outside the specifications, the operator is warned that it is impossible to set the optimum copy magnification and is prompted to manually set the copy magnification.

Table 2 below shows the original size and copy paper size in the AMS mode in the normal copying mode where originals are transported one by one, and calculations based on them.

This shows the relationship with the copy magnification that can be set.

[Automatic optimum copy paper size setting function (APS)] In addition, this copier can print copies of the original image in a size that can be formed without image cut-off when the fg, document size and copy magnification are specified by the operator. It has an automatic optimum copy paper size setting function (hereinafter referred to as APS) that automatically selects the paper feed cassette that is full of paper.

When this APS mode is selected, the 20th PtJ (20
2), the document size is determined and coded, and the first CP
It is sent to U (201). 1st CPU (201
> calculates the optimum copy paper size from the original size code and the copy magnification selected by the operator, and selects the paper feed section in which copy paper of the calculated size is set, that is, the cassette (30), <35) Select. On the other hand, which cassette (30) contains copy paper of the calculated size?

(35), or if the copy paper is outside the specifications of this copier, the operator is warned that the optimum size copy paper does not exist, and the operator is warned to manually select the paper source or manually select the copy magnification. prompts you to reconfigure.

Table 3 below shows the relationship between the document size, copy magnification, and copy paper size calculated and set based on these in the APS mode in the normal copy mode in which documents are conveyed one by one.

[Margin below] [1 magnification of original in 2-sheet feed mode, copy paper related code A
When operating the D F (100) in the two-sheet feeding mode and copying two original images on one side of one copy paper, the following relationship exists between the original size, copy magnification, and copy paper size. For example, when two A4 documents are fed horizontally, if the copy magnification is [1,000], A3 is selected as the copy paper, and the original images for two A4 documents are transferred onto A3 copy paper. It fits perfectly. Also, the copy magnification is [0,707
], then by selecting A4w: through as the copy paper, the original image will fit in just the right amount. On the other hand, if A3 copy paper is selected for two sheets of A4 side-by-side originals, the copy magnification is set to [1].
,000], and if A4 vertical copy paper is selected, and the copy magnification is set to [0,707], the original image of two A4 horizontal pages can be printed on one sheet. It can fit just the right amount on copy paper.

Therefore, by using A D F (100) and copying in two-sheet feed mode, it is possible to create two original images on one sheet of copy paper, saving time on copy paper and copying time. Leads to savings. Furthermore, if the double-sided copy mode is used in combination, original images for four sheets can be created on the front and back sides of one sheet of copy paper. If the copying machine (1) is equipped with a book division function, that is, a function that exposes and scans images on one side of a book original, it is possible to use the two-sheet feed mode, book division function mode, and double-sided copy mode together. In this way, images of two original documents can be formed on the front and back sides of one sheet of copy paper. These copying modes further save copying paper and copying time.

[Operation Panel] In Fig. 6, the operation panel (15) of the copying machine main body (1)
0) is fully equipped with keys, display means, etc., which will be explained below. Each key has a switch inside, which can be turned on or off by pressing it.

(151) is the print key for starting the copying operation, (152) is the numeric keypad for setting the number of copies, etc., and (153) is the stop key for canceling multi-copying in the middle. Clear/stop key with the role of clearing numbers. <154> is an interrupt key for executing interrupt copy.

For (155), the copy mode is normal copy, double-sided copy.

Copy mode switching key for switching to either composite copy. (156) is a magnification selection key for setting the copy magnification to a preset magnification or an arbitrary magnification. (157) is a copy paper selection key for selecting the copy paper size. (158) is the AMS.

Document size detection mode selection key for selecting either APS or manual mode. (159) is a feed mode selection key for selecting the document feed mode between one sheet feed and two sheet feed.

The operation panel <150) further includes a display means described below.

(160) is a 4-digit display segment that displays the number of copies, etc. (161”) is a 4-digit display segment that displays the copy magnification set manually. (162) to (1
65) displays the preset copy magnification L
ED, (166) shows normal copy, (167) shows double-sided copy, and (168) shows composite copy.
E D, (169) is an LED that displays the copy paper size
, (170) is the AMS mode, (171) is the APS mode, (172) is the manual mode, (173) is the single sheet feeding mode, (17
4) is an LED for displaying the two-sheet feeding mode, and these various LEDs are rotated each time the corresponding keys (155) to (159) are turned on.

[Control Circuit] Figure 7 shows the first CPU (2) that controls the main body (1) of the copying machine.
01) and the second CP that controls A D F (100)
The input/output configuration of CPU U (202) is shown.
), (202) are connected to each other for synchronization.

The input/output board of the first CPU (201) includes various key switches (151) to (1) on the operation panel (150).
159), microswitch (SW) installed in the paper feed section
switch matrix (20
3) is connected, and this switch matrix (20
3) and the display segment (1) via the decoder (205).
60), a matrix (204>) consisting of display LEDs
is not connected. Further, the output boat outputs on/off signals to the main motor, developing motor, etc. in the copying machine main body (1). The main motor pulse signal can be input to the terminal (Bl).

The input port of the second CPU (202) is the ADF (
100) open/close detection switch (PSW), A D
An F start switch (SSW), sensors (SEL) to (SE4) that detect the conveyance of the i-document, and a sensor (SE5) that detects the rotation of the pinch roller motor (123) are connected. The output boat has a pickup roller (
112), forward/reverse roller (113), (114)
a feeding motor that drives the transport belt (125), a solenoid that moves the pickup roller (112) up and down, and discharge rollers (131) to (134).
A discharge motor, etc. that drives the is connected. Terminal (B2
) is input with the pulse signal of the transport motor.

In addition, a clock terminal (SCK) for data sampling and output of the first CPU (201), and an interrupt output terminal (
PCO), data output terminal (SOUI') and data input terminal (SIN) are the clock input terminal (SCK) and interrupt input terminal (INT) of the second CPU (202).
), data input terminal (SIN) and data output terminal (
SOUT>.

[Control Procedure] Hereinafter, the control procedure of this embodiment will be described in detail with reference to FIGS. 8 to 19.

FIG. 8 shows the first CPU (20
1) shows the main routine.

When the first CPU (201) is reset and the program starts, first, in step (Sl), the internal RAM is cleared, various registers are initialized, and initial settings are made to put each device into the initial mode.

Here, the flags used in the following routine will be explained in advance.

Copy flag (FO): This flag is used to indicate that the copying machine is in operation, and is set to 11 from the completion of the copy start process until the end of the copy process.

Mode flag (Fl): This is to indicate the document feeding mode in ADF (100), and is set with the feeding mode selection key (159). ” indicates two-sheet feed mode.

Feed flag (F2): This flag is used to indicate the number of originals actually fed onto the document table glass (19) at A D F (100). '0' indicates one sheet. , rl'' indicates that there are two pieces. Even if the two-sheet feeding mode is selected, if the total number of originals is an odd number, the final original is transported at r□. Note that this flag (F2) is set by the feed number signal from the second CPU (202).

Returning to the routine, in step (B2) the first CPU (2
Set the main timer of 01). This main timer determines the time required for one routine of this main routine, and its value is set in advance in step (Sl).

Next, the subroutines shown in steps (B3) to (B5) are sequentially called. Step (B3) is a subroutine for manual key processing, including input processing from the numeric keypad (152),
Executes the process of storing the copy paper size set in the cassettes (30) and (35) in the internal RAM, the process of setting the copy mode using the copy mode switching key (155), and the process of setting the magnification using the magnification selection key (156). do.

Step 7 (B4) is a subroutine for document feed mode switching processing, and A D is selected using the feed mode selection key (159).
F (100) Execute the document feed mode setting process. Step (B5) is a subroutine for copy start processing, which processes the start of a copy operation.

Next, in step (B6), the copy flag (FO) is set to 11.
If it is reset to ``0'', the process moves to step (B8), and if it is set to ``1'', the process goes to step (S7) to execute a subroutine for copy processing that performs the actual copying operation. Execute and move to step (B8). In step (B8), data transmission and reception with the second CPU (202) is processed. This step (58)-'
C' communicated signals are transmitted to the first CPU (201
) to the second CPU (202) include a copying operation signal, an original feed mode signal, and a signal when the image exposure scan for the set number of sheets is completed! There is a manuscript exchange signal. From the second CPU (202) to the first CPU (20
1) Signals that can be transmitted include: ADF mode signal: During copying operation and ADF (10
When a document is loaded into the document tray (111) when the document tray (111) is not in operation, the signal is reset to "rl", and when the last document is completely ejected, the signal is reset to "10".

Set completion signal: A signal that is output when the original is conveyed and stopped at a predetermined position on the original platen glass (19).

Original size signal: A D F (100) sensor (
SE3).

Food signal of document size detected in (SE5).

Feed number signal: A signal indicating the number of originals actually fed onto the original platen glass (19).

Prohibition signal: A signal that can be output when the size of the fed document is inappropriate for copying.

When the processing in each of the above subroutines is completed, the process waits for the main timer to finish counting in step (S9), and then returns to step (S2). The time length of one routine is used to count the various timers that appear in each subroutine. That is, the end of counting for each type of timer is determined based on how many times this l routine has been repeated.

FIG. 9 shows a subroutine for document feeding mode switching processing executed in step (S4) of the main routine.

First, in step <StO>, the copy flag (FO) is set to "
If it is set to 'IJ', that is, if a copying operation is in progress, the process returns to the main routine.

If it has been reset to 0., it is determined in step (511) whether the feed mode selection switch (159) is on-edge or not. If it is not on-edge, the process returns to the main routine, and if it is on-edge, the mode is Determine whether the flag (Fl) is r□J. If the mode flag (Fl) has been reset to rOJ, that is, if the single-sheet feed mode has been set at this point, step (
In step 513), it is determined whether vertical threading is selected as the copy paper. If it is horizontal threading, the process returns to the main routine, and if it is vertical threading, the mode flag (Fl) is set at step <514).
) to 11. In other words, set the 2-sheet feed mode. In the two-sheet feed mode, the original image becomes longer in the vertical direction (image scanning direction), making it unsuitable for horizontally threaded copy paper. Therefore, the two-sheet feed mode is enabled only when vertical copy paper is selected.

On the other hand, the mode flag (Fl) is set in step (512).
If it is determined that ``rl'' is set to rl, the mode flag (Fl) is reset to ``10'' in step (515), that is, the one-sheet feed mode is set.

FIG. 10 shows a subroutine for copy start processing executed in step (S5) of the main routine.

First, in step (520), the ADF mode signal is
If it is set to "rl", that is,
If copying using A D F (100) is selected [see step (5123), step (52
In step 1), it is determined whether or not a document prohibition signal is output. If the document prohibition signal is not output, step (
522), it is determined whether a set completion signal is output. If this set completion signal is not output, the process continues as it is, and when the output is completed, that is, when the original is set at a predetermined position on the document table glass (19) [step (5170)].

(5212) Refer to step (525) to set the copy flag (FO) to rl.

On the other hand, if it is determined in the step (521) that the document prohibition signal is output (see step (5206)), a prohibition display is output in step (526) to prohibit the start of the copying operation.

In step 7 (520), the ADF mode signal is ro.

If it is determined that the
After confirming that the copy flag (FO) has been reset to "ro" in step 3), it is determined in step (524) whether the print switch (151) is on-edge. If the print switch (151) is turned on, the copy flag (FO) is set to 11 in step (S25).
”.

As described above, by setting the copy flag (FO) to ``1'', the copying process in step (s8) can be started.The control of the copying process is well known, and its explanation will be omitted.

FIG. 11 shows the main routine of the second CPU (202) that controls the Gt A D F (100).

When the second CPU (202) is reset and the program starts, first, step (5100)
Clears the internal RAM, initializes various registers, etc., and performs initial settings to put each device into the initial mode.

Here, the plugs used in the following routine will be explained in advance.

Copy flag (FO), mode flag (Fl), feed flag (F2): The above flags are the same as those used in the control of the first CPU (201).

ADF operation flag (F3): ADF (100
) is in operation, and the r1. is set to

ADF transfer flag (F4): ADF (100
) is used to indicate that the document is being fed, and r1. is set to

Lead edge registration flag (F5): Place the original on the tray (111)
) to the leading edge registration position, and is set to "1" from the start of feeding the first and second documents until the leading edge registration process is completed. .

Tip registration start flag (F6): Indicates the timing to start tip registration processing.
11" from the start of feeding the first and second originals until the feeding motor and pick-up roller (112) start up."
is set to

Waiting flag (F7): This flag is used to indicate that the document is waiting at the leading edge registration position, and is flagged in 11. is set to

Set completion flag (F8): This is to indicate that the original fed from the original tray (111) is set in a predetermined position on the original platen glass (19), and ejection starts from the completion of feeding. "r1" is set until then.

Ejection flag (F9): This flag is used to indicate that the document is being ejected from the document table glass (19) to the ejection tray (135). Set.

Original plug (FIO): This is used to indicate whether the original being fed in two-sheet feeding mode is the first or second sheet.When it is "0", it indicates the first sheet, and ' 1” indicates that it is the second sheet.

Returning to the routine, in step (Slot) the second CPU
(202) Set the main timer. This main timer determines the time required for one routine of this main routine, and its value is set in advance in step (5100).

Next, in step (5102) it is determined whether or not the mode is ADF mode. If NO, the process moves to step (5112), and if YES, steps (5103) to (5105)
) are called in sequence. Step (5
103) detects the on-edge of the ADF start switch <SS> and executes processing to start the operation of the ADF (100). In step (5104), the original is transferred from the original tray (111) to the pinch roller (121).
The leading edge registration process is executed to send the image to the leading edge registration position (122). Step (5105) executes a process of detecting the size of the document sent out from the document tray (111).

Next, in step (5106), it is determined whether the mode flag (Fl) is "1."
'', that is, if it is the one-sheet feeding mode, the subroutines of steps (5107) and (5110) are called, and the process moves to step (5112). Step (5107) executes a process of feeding and setting normal originals one by one onto the original platen glass (19). Step (sllo) executes processing for ejecting one document onto the ejection tray (135).

In the step (5106), the mode flag (Fl) is set to “
1", that is, if the two-sheet feeding mode is selected, the subroutine of step (5108) feeds and sets the originals two sheets at a time onto the original platen glass (19). Execute processing. And step (
5109), it is determined whether the feed flag (F2) is "1" or not, and '1. If set to
) subroutine to output two originals to the output tray (135).
Then, the process moves to step (5112). The feed flag (F2) is 10. If it has been reset, the subroutine of step (5110) is executed and the process moves to step (5112).

In step <5112), data transmission and reception are processed with the first CPU (201). The signals that can be communicated here are the same as those described in the process of step (S8) above.

When the processing in each of the above subroutines is completed, the process waits for the main timer to finish counting in step (5113), and then returns to step (Slot). The time length of one routine is used to count the various timers that appear in each subroutine.

FIG. 12 shows a subroutine for ADF start processing executed in step (5103) of the main routine of the second CPU (202).

First, in step (5120) it is determined whether or not the copy flag (FO) has been reset to "rO".
1) Determine whether the -r A D F operation flag (F3) is reset to r□, and determine whether the sensor (SEI) on the document tray (111) is on in step (5122), If the answer is No, the process immediately returns to the main routine, and if the answer is Yes to both, the copying operation is performed.

If it is confirmed that the ADF is not operating and that the original is set on the tray (111), step (5)
123) sets the ADF mode signal to 11''.

Next, in step (5124), wait for the ADF start switch (SSW) to turn on, and then proceed to step (stz5).
) to set the ADF operation flag (F3) to "rl", and in step (5126) set the ADF feeding flag (F4) to "1".
．． In step (5127), the leading edge registration flag (F5) and the leading edge registration start flag (F6) are set to ``rl''. Next, in step (5128), it is determined whether the mode flag (Fl) is "11" or not, and "IJ
If it is set to a, the feed flag (F2) is set to 11'' in step <5129), and if it is reset to rO, the feed flag (F2) is reset to r□ in step (5130). End this subroutine.

FIG. 13 shows a subroutine for edge registration processing that can be executed in step (5104) of the main routine of the second CPU (202).

First, in step (5140), the tip registration flag (F
5) Determine whether or not it is rl, and if it is reset to 0, immediately return to the main routine, and if it is set to IJ, the tip registration start flag (F6) is set to rl in step (5141). Determine whether or not. If this flag (F6) is reset to "0", step (
5144), and if it is set to '1', the feed motor and pickup solenoid are turned on in step (5142). With this, the pickup roller (112
) comes into pressure contact with the top surface of the document and rotates, and the forward/reverse rollers (113) and (114) also start rotating, and only one document in the top layer is sent out from the tray (111) (see Figure 3a). . Next, in step (5143), the tip registration start flag (F6) is reset to r□,
The process moves to step (5144).

In step (5144), it is determined whether the sensor (SE2) is on-edge, and if it is not on-edge, step (5144)
146>, and if it becomes on-edge, step (51
Step 45) sets the tip registration timer, and step (5)
146). This leading edge registration timer is set to the time until the leading edge of the document detected by the sensor (SE2) contacts the nip portion of the pinch rollers (121) and (122) and forms a loop. Therefore, in step (5146), wait for the end of the count of this tip registration timer, turn off the feed motor and pickup solenoid in step (5147), and then turn off the feed motor and pickup solenoid in step (514).
g) to set the tip resist flag (F5) to 10. and set the standby flag (F7) to "1" in step (5149).
．． , and end this subroutine.

As a result, the leading edge of the document sent out from the tray (111) comes into contact with the nip portion of the pinch rollers (121) and (122), corrects the skew, and waits while forming a loop on the upstream side ( (See Figure 3b).

FIG. 14 shows a subroutine for document size detection processing that can be executed in step (5105) of the main routine of the second CPU (202). This subroutine is executed while the original is being fed from the leading edge registration position to a predetermined position on the original platen glass (19), and detects the length of the original in the conveyance direction by pulse counting by the sensor (SE5).
The document size is determined based on the combination of on and off of the sensor (SE3) that detects the width direction.

Here, first, in step (5150), it is determined whether the Vinci roller motor (123) has started up.

This pinch roller motor (123) follows the steps below (
5164). If it is not a rising edge, the process moves to step (5152), and if it is a rising edge, the pulse count of the sensor (SE5) is started in step (5151), and the process moves to step (5152). When the off-edge of the sensor (SE2) is confirmed in step <5152), the pulse count of the sensor (SE5) is stopped in step (5153), and the pulse count of the sensor (SE5) is stopped in step (5154).
In step (5155), the document size is calculated using the pulse count number and the on/off signal of the sensor (SE3).
Outputs the original size signal and ends this subroutine.

FIG. 15 shows a subroutine of document feeding process (2) in the single sheet feeding mode, which is executed in step (5107) of the main routine of the second CPU (202).

First, in step (5160), the ADF feeding flag (F4
) is "1" or not, and if it is reset to %'OJ, it immediately returns to the main routine, and if it is set to '1', that is, the ADF start switch (SSM)
When turned on, the standby flag (
F7) is determined to be rIJ. Standby flag (F7)
If it has been reset to "rO", step <5166)
’1. If the leading edge of the document is registered with the pinch rollers (121) and (122), it is determined in step (5162) whether or not the discharge flag (F9) is set to 10. . Emission flag (F9
) is already set in rIJ, step (516
4), and if it has been reset to "rO", turn on the transport motor in step (5163), and then turn on the transport motor in step (516).
In 4), the pinch roller motor <123) is turned on, and in step (5165), the standby flag (F7) is reset to rOJ, and the process moves to step (5166). With this, feeding of the document from the leading edge registration position onto the document table glass (19) can be resumed.

In step (5166), it is determined whether the sensor (SE2) is off-edge, and if it is not off-edge, step (5166) is performed.
168), and if it is off-edge, proceed to step (51).
Step 67) sets the stop timer, and step (5168)
to move to. This stop timer is activated when the trailing edge of the document is connected to the sensor (S).
E2) until the exposure start position on the document platen glass (19) is reached. Therefore, in step (5168), wait for the stop timer to finish counting, and in step (5169), turn off the pinch roller motor (123) and the conveyance motor, and in step (5170).
) outputs the original set completion signal to the first CPU (201), and in step (5171) outputs the set completion flag (F
8) is set to rl. This means that the original has been fed and stopped at a predetermined position on the original platen glass (19).

Next, in step (5172), it is determined whether the sensor (SEL> is on or not. If it is on, that is, if the next document is on the tray (111), the leading edge registration process is performed on that document in advance. To do this, set the tip registration flag (F5) to 11 in step (5173),
At step 74), the leading edge registration start flag (F6) is set to ``1 degree'', and at step (5175), the ADF feeding flag (F4) is reset to rO, thereby terminating this subroutine. Further, in the step (5172), the sensor (S
EI) is off, that is, if there are no originals in the tray (111), the AD
The F feeding flag (F4) is reset to 10'' and this subroutine ends.

Figures 16a and 16b show 2 steps executed in step (st08) of the main routine of the second CPU (202).
The subroutine of document feeding process (■) in sheet feeding mode is shown. In this subroutine, only when the first original document and the second original document are the same size and are horizontally fed (for example, A4 horizontally or B5 horizontally), two sheets are fed. The process is executed, and when another document is fed, the copying operation is prohibited and the document is ejected.

First, in step (5180), the ADF feeding flag (F4
) is rl, and if it is reset to ``O4'', it immediately returns to the main routine; if it is set to ``1'', that is, when the ADF start switch (SSW) is turned on, step ( 5181) to set the original flag CF.
IO) is r□. Original flag (FIO
) is set to ``1'', that is, the document to be fed from now on is the second sheet, the process moves to step (5201), and if it has been reset to '0'', that is, the document to be fed from now on If the document to be processed is the first, step (5182)
It is determined whether the standby flag (F7) is rl. If the standby flag (F7) is reset to rOJ, the process moves to step (5187), and if it is set to '1'', that is, if the leading edge registration process for the first document has been completed, the process moves to step (5187). (5183) and the discharge flag (F9
) is rO''. The discharge flag (F9) is “
If it is set to "1", it means that one set of originals is already being ejected and the transport motor is turned on.
s5), and when it is reset to 0., the conveyance motor is turned on in step (5184), the pinch roller motor (123) is turned on in step (5185), and the standby flag (F7) is turned on in step (5186). ) to rO”
and moves to step (5187). As a result, feeding of the first document from the leading edge registration position onto the document table glass (19) is resumed (see FIG. 3c).

In step <5187), it is determined whether the sensor (SE2) is off-edge, and if it is not off-edge, step (5187) is performed.
193), and if it is off-edge, the step (st
In step a8), it is determined whether the document size is horizontal.

In the case of vertical threading, the W and striped images cannot fit on the copy paper, so the prohibition signal is sent to the first CPU (2) in step (5206).
01), and in step (5207) reset the ADF transport flag (F4) to r□, and in step (520
In step 8), set the discharge flag (F9) to "rl" to instruct document discharge, and return to the main routine. If the document size is horizontal, the sensor (SEI) is set in step (5189).
is on, and if it is not on, that is, 2
If the first document is not on the tray (111) and the first document being fed at this time is the final document, it will be processed as the second document, so step (S190) is performed. (Flo〉or1” Nisetoshi, step (
5191), the feed flag (F2) is reset to "0.", and the process moves to step (5209).

If the sensor (SEI) is on in step (5189), that is, if the second document is on the tray (111), a switchback timer is set in step (5192). This switchback timer is set to the time from when the trailing edge of the first document is detected by the sensor (SE2) until it completely passes through the nip portion of the pinch rollers (121) and (122).

Next, in step (5193), it is determined whether or not the count of the switchback timer has ended.
) to turn off the conveyance motor and the pinch roller motor (123) (see Figure 3d), followed by step (5195).
Turn on the transport motor in reverse. As a result, the first original is fed backwards toward the pinch rollers (121) and (122). Then, in step (5196), the tip registration flag (F5) and the tip registration start flag (F6)
) to "1" to prepare the leading edge registration process for the second document. At the same time, a reversal timer is set in step (5197), and the process moves to step (5198). This reversal timer is set to the time from when the original is completely reversely fed until the trailing edge comes into contact with the nip portion of the pinch rollers (121) and (122) and the trailing edge is registered.

Therefore, in step (5198), wait for the count of the reverse rotation timer to end, in step (5199), turn off the reverse rotation of the transport motor, and in step (5200), set the document flag (FIO) in order to process the second document. 11”. With this, the trailing edge of the first document is attached to the pinch roller (1
21) and (122) and waits in a registered state.

Next, in step (5201), the standby flag (F7) is set to "
Determine whether the angle is 1° or not. It is determined whether or not the leading edge registration process of the second document is completed, and the standby flag (F
If 7) is reset to 10, step (520
4), and if it is set to ``rl'', that is, if the subroutine of step (5104) is executed and the leading edge registration process for the second document is completed, ``rl'' is set.
Refer to step (5149). In step (5202), the conveyance motor and pinch roller motor (123) are turned on. In step <5203), the standby flag (F7) is set to 10.
and moves to step (5204).

As a result, the first and second originals are successively fed onto the original table glass (19) (see Figures 3g and 3h).

In step (5204), it is determined whether the sensor (SE2) is off-edge, and if it is not off-edge, step (5204)
210), and if the document is off-edge, that is, at the time when the trailing edge of the second document passes the sensor (SE2), the size of the second document is changed to the size of the first document in step (5205). Determine whether it is the same as or not. If they are not the same size, they are not suitable for copying, so a prohibition signal is output to the first CPU (201) in step (5206), and the ADF feeding flag (F4) is reset to r□ in step (5207). , the discharge flag (F9) in step (5208)
is set to "1" to instruct document ejection, and return to the main routine. If the first and second documents are the same size, a stop timer is set in step (5209), and step (5209) is set.
5210). This stop timer is the same as the one entered in step (5167) above.

Therefore, in step (5210), wait for the stop timer to finish counting, and in step (5211), turn off the conveyance motor and pinch roller motor (123), and in step (5210), turn off the conveyance motor and pinch roller motor (123).
212) sends the original setting completion signal to the first CPU (212).
1), set the set completion flag (F8) to "1" in step (5213), and then in step (5214)
Reset/turn the original flag (FIO) to "rO". The two originals are now lined up in the transport direction and placed on the original glass (19).
) is fed to the predetermined position above (3rd
(See Figure 1).

Next, in step (5215), it is determined whether the sensor (SEL) is on or not. In order to pre-process the tip resist as
216), set the tip registration flag (F5) and tip registration start flag (F6) to r1, and in step (S217) set the ADF feed flag (F4) to 10''.
to end this subroutine. Moreover, if the sensor (SEL) is off, that is, the tray (1
11), if there are no more manuscripts, proceed to step (5217).
), reset the ADF feeding flag (F4) to "O4" and end this subroutine.

FIG. 17 shows the subroutine of document ejection processing in single-sheet feeding executed in step (5110) of the main routine of the second CPU (202). This process is executed in single-sheet feeding mode. is selected, or if the last original of an odd number of originals is fed even though 2-sheet feeding mode is selected, or the first original is unsuitable for copying in 2-sheet feeding mode. If it is determined that there is, [NO in step (5188)].

First, in step (5220), the discharge flag (F9) is set to "
1”. The ejection flag (F9) is set to ``1'' when the image exposure scan for the number of copies of the original is completed in the copying machine main body (1) and the original exchange signal is output. If it remains reset to “0”, return to the main routine immediately and return to “1”.
．． If it is set, it is determined in step (5221) whether or not the set completion flag (F8) is "1". If the set completion flag (F8) has been reset to 10'', the process moves to step (5224), and if it has been set to ``1'', the transport motor and discharge motor are turned on in step (5222), and step (5223) Set completion flag (F
8) is reset to r□, and the process moves to step (5224). With this, the original set on the original table glass (19) starts to be ejected.

In step (5224), the sensor (SE4>
), that is, whether or not the trailing edge of the document has passed the sensor (SE4). If it is not an off-edge, the process moves to step (5226), and if it is an off-edge, the process proceeds to step (5226).
5225) sets the ejection timer, and step (522
6). This ejection timer starts when the rear edge of the document is detected by the sensor (SE4) and then the ejection roller (133)
(134) is set to the time until cutting.

Therefore, in step (5226), the ejection timer waits for the ejection timer to finish counting, and then in step (S227), the ejection motor is turned off. The document is now discharged onto the discharge tray (135).

Next, in step (5228), the standby flag (F7) is set to r
In other words, it is determined whether the next document is waiting at the leading edge registration position. The standby flag (F7) is “1”
”, the ADF feeding flag (F4) is set to 1 in step (5232) to execute the feeding process.
1'' and proceeds to step (5233).

If the standby flag (F7) is reset to 10,
That is, if the document ejected at this time is the final document, the transport motor is turned off in step (5229), and step <
5230), the ADF operation flag (F3) is reset to O4, and the ADF mode signal is set to 1 in step (5231).
It is reset to 0J and output to the first CPU (201), and the process moves to step (5233).

In step (5233), set the discharge flag (F9) to 10.
, and in step (5234) set the mode flag (
It is determined whether Fl) is 11 or not. Mode flag (Fl
) has been reset to 0°, that is, if it is in single-sheet feed mode, the process returns to the main routine. If the mode flag (Fl) is set to rl, that is, if the mode flag (Fl) is set to 2
If it is the sheet feed mode, the feed flag (F2) is set to "1" in step (5235) and the process returns to the main routine.

FIG. 18 shows the subroutine of document ejection processing (2) in two-sheet feed, which is executed in step (Sill) of the main routine of the second CPU (202). In this subroutine, when the document is ejected, the first document is transferred to the ejection roller (131>, (
132), the drive of the conveyor belt (125) is temporarily stopped and the second document is placed on the document table glass (19).
), and after leaving an appropriate gap between the two documents, allow the conveyor belt (125) to rotate again.
The two originals are discharged onto the discharge tray (135) in good alignment.

Specifically, steps (5240) to (5243) are the same as steps (5220) to (5223),
Ejection flag (F9) and set completion flag (F8) are 1
Ejection processing starts when it is set to 1 (
(see FIG. 4a), and in step (5244) it is determined whether the sensor (SE4) is on-edge. Sensor (
If SE4) is not on-edge, step (5247)
If the document is on-edge, it is determined in step <5245 whether the document flag (FIO) is "rO". If the original flag (FIO) has been reset to 10'', that is, if the original whose leading edge was detected by the sensor (SE4>) in step (5224) is the first original, step (
5246), turn off the transport motor, and step (5247)
). Now the second document can be placed on the document glass (
19) Only the first original is ejected (see Figures 4b to 4d).

In step (5247), it is determined whether the sensor (SE4) is off-edge. If the sensor (SE4) is not off-edge, the process moves to step (5252), and if it is off-edge, in step (5248), the document flag (FIO) is set to 10.
”, that is, step (5247
), if the document whose trailing edge was detected by the sensor (SE4) is the first document, in step (5250) the transport motor is turned on, and in step (S251) the document is rotated.
) to "r1" and return to the main routine. As a result, the ejection of the second document that has been waiting on the document table glass (19) is restarted (see FIG. 4e).

On the other hand, in the step (5248), the original flag (FIO
) is set to rl, that is,
If the document whose trailing edge was detected by the sensor (SE4) in step (5247) is the second document, step (5247)
Set the discharge timer in step 49) and proceed to step (5252)
to move to.

Steps (5252) to (S257) are the steps (
5226) to (5231), the ejection motor is turned off when the ejection timer finishes counting [step (52
52), YES in step (5253)], execute the feeding process for the next document [N in step (5254)]
o, step/b (5258> ), if the final document has been ejected, execute end processing [step (S254)
), YES, steps (5255) to (5257).

Then, in step (5259), the discharge flag (F9) is reset to "rO", and in step (5260), the document flag (FIO) is reset to "0", and this subroutine is ended.

FIG. 19 shows another subroutine of document ejection processing (2) in two-sheet feeding executed in step (Sill) of the main routine of the second CPU (202). ) is set higher than the original transport speed by the transport belt (125), and the two originals are ejected onto the ejection tray (135) in good alignment with an appropriate gap between them.

Specifically, steps (5270) to (5273) are the steps (5240) to (5243) and (522
0) to (5223), and the discharge flag (F9
), the discharge process is started when the set completion flag (F8) is fully set to "1". In this case, the document conveyance speed by the ejection rollers (131) to (134) is set higher than the document conveyance speed by the conveyor belt (125), and the distance between the first and second document gradually increases. (See Figures 5a and 5b).

Next, in step (5274) it is determined whether the sensor (SE4) is off-edge. If the sensor (SE4”) is not off-edge, the process moves to step (5278), and if it is off-edge, the document flag (FI
0) is 11''. Original flag (FIO)
is reset to 10°, that is, step (5
If the document whose trailing edge was detected by the sensor (SE4) in step 274) is the first document, the document flag (FIO) is set to "1" in step (5277) and the process returns to the main routine.

This subroutine is called again and step (527
If it is determined in step 5) that the original flag (FIO) has been set to 11'', then this step (5274)
If the document whose trailing edge is detected by the sensor (SE4) is the second document, a discharge timer is set in step (5276).

The following steps (5278) to (5286) are the same as the above steps (5252) to (5260), and when the ejection timer finishes counting, the ejection motor is turned off [YES in step (5278), step (5279) , start feeding the next document and end this subroutine [Step (5280)]
284) to (5286)], if the final original is to be ejected, execute the end process and end this subroutine [Step (5280) "CY E S, STELLA';
/<5281)~(5283).

(5285), (5286) Ko.

[Main part of the example] In the above configuration, the pinch roller (121).

(122) are used as the registration members for the leading and trailing edges of the document, and when the two-sheet feeding mode is selected, first,
Perform edge registration processing on the first document [Figure 13,
Refer to the subroutine of step (5104)], after allowing the first document to pass through the pinch rollers (121) and (122), switch back and perform trailing edge registration processing [see FIGS. 16a and 16b, 7p (5184
), (5185), (5189), (5192)
- (5199) Reference.

After that, wait for the leading edge registration process of the second document to be completed [YES in step <5201' in the same figure], and place the two documents with the trailing edge and leading edge registered on the document glass (19).
) to a predetermined position on the
02), (5209) to (5211) Ko. With this,
The two originals are reliably set at a predetermined position on the original table glass (19) in a continuous state in the image exposure scanning direction.

[Other Embodiments] The present invention is not limited to the above embodiments, and can be modified in various ways within the scope of the gist.

For example, in the above embodiment, the pinch rollers (121) and (122) were used as means for registering the leading and trailing edges of the document, but as shown in FIGS. 20a to 20d, the gate (129) ) can also be used. In this case, the gate (129) is a pinch roller <121),
(122) is installed on the downstream side in the feeding direction so as to be able to move forward and backward with respect to the feeding path, and the upper pinch roller (121) can move toward and away from the lower pinch roller (122).

In this case, when the two-sheet feeding mode is selected and the ADF start switch (SSW) is turned on, the pinch roller (121) first separates from the lower roller (122) and the gate (129) enter the road. The originals stacked on the original tray (111) are fed starting from the topmost original (Dl) by the rotation of the pickup roller (112), and are turned by the forward/reverse rollers (113) and (1t4>, and the leading edge is It passes between the pinch rollers (121) and (122) and comes into contact with the game (129), and the leading edge registration process is performed (see 20th aU1!J). after that,
When the gate (129) is retracted from the feeding path, the pinch roller (121) is brought into pressure contact with the lower roller (122) and is driven to rotate, and the conveyor belt (125) is also driven to rotate normally. With this, the rear end of the original (Dl) is at the gate (1
29) (see Figure 20b).

Next, the gate (129) enters the feeding path, and
The pinch roller (121) separates from the lower roller (122). At the same time, the conveyor belt (125) shows the arrow (C゛)
The document (Dl) is reversely driven in the direction shown in FIG. With the trailing edge registration process applied to the first document (Dl) in this manner, the second document (D2) on the document tray (111) is fed,
Perform tip resist processing. With this, two manuscripts <D
I>, (D2) are continuously arranged in parallel with the rear end resist and the front end resisted at the gate (129).

From this state, the gate (129) is retracted from the feeding path, and the pinch roller (121) is moved to the lower roller (12).
2) and can be rotated by pressing the conveyor belt (12
5) is also driven in normal rotation, and the originals (Di) and (D2) are simultaneously fed onto the original platen glass (19) (see FIG. 20d). When the rear end of the second document (D2) reaches a predetermined position on the document table glass (19), that is, the exposure start position by the optical system (20), the pinch roller (121)
(122) and the rotational drive of the conveyor belt (125) are stopped.

On the other hand, as for the process of setting the original in a predetermined position, control was shown in which the feeding is stopped using a timer based on the trailing edge detection signal of the original by the sensor (SE2). A method may also be used in which a stopper is provided and the document is switched back. That is, the document is once fed until it overruns a predetermined position, and then the conveyor belt is
125) is reversed and switched back to position the rear end of the document in contact with the stepped portion or stopper.

As is clear from the above explanation, according to the present invention, trailing edge registration processing and leading edge registration processing are performed on two originals at the front and rear of the resist member. It is possible to reliably and continuously stop the original documents in a juxtaposed state at a predetermined position on the platen, and the current form of the ADF can be used almost as is, making it extremely practical.
When the ADF of the present invention is combined with the double-sided copying function, it is possible to copy four originals on both sides of one copy paper, and when the book division copying function and the double-sided copying function are combined, the front/back side of the copy paper can be copied. The original to be copied remains on the platen until double-sided copying is completed, and the time required for copying is 1.
Not only can this greatly save time and effort, but it is also easy to use since there is no need to set the original again even if a copy paper jam occurs during back side copying.

[Brief explanation of the drawing]

FIGS. 1 to 19 show an automatic document feeder (A) according to the present invention.
Fig. 1 is an internal configuration diagram of a copying system, Fig. 2 is a partially cutaway perspective view of the ADF, and Figs. 3a to 31 show document feeding processing. 4A to 4C are operation explanatory diagrams showing one example of the document ejection process, FIGS. 5A to 5C are operation explanatory diagrams showing another example of the document ejection process, and FIG. 6 is an operation explanatory diagram. Panel plan, No. 7
The figure is a block diagram of the control circuit, and FIGS. 8 to 19 are flowcharts showing control procedures. Figures 20a to 20
FIG. d is an operational explanatory diagram showing document feeding processing in a modified example of the registration means. (100)...Automatic document feeder (ADF), (11
0)...Document feeding unit, (111)...Document tray,
(112)...Pickup roller, (120)...
- Original transport unit, (121). (122)...pinch roller, (125)...transport belt, (129)...gate, (130)...
Document ejection section, (SEI) to (SE4)... photosensor for document detection.

Claims (1)

[Scope of Claims] 1. A document feeding unit that feeds the originals placed on a document tray one by one; and a device that stops the originals fed from the document feeding unit at a predetermined position on a platen, and exposes the originals. a document transport unit having a transport belt that discharges the document from above the platen after the operation is completed; a registration member that is installed in a transport path between the document feed unit and the platen and is capable of registering the leading or trailing edge of the document; a leading edge registration control means for registering a leading edge of a document fed out from the document feeding section with the registration member; and after the document fed out from the document feeding section passes through the registration member, the document is placed on the conveyor belt. trailing edge registration control means for registering the trailing edge of the document with a resist member by feeding the document backward; and after registering the trailing edge of the first document by the trailing edge registration control means, registering the trailing edge of the second document by the leading edge registration control means. an automatic document feeder comprising: a conveyance control means for registering the leading edge of a document, and stopping two documents whose trailing edge and leading edge have been registered in a juxtaposed state at a predetermined position on a platen; .