JPS63285533A - Copying machine - Google Patents

Abstract

PURPOSE:To prevent such miscopying that a blank is formed by inhibiting copying operation when a detector detects 1st and 2nd originals differing in size in two-sheet original feed mode. CONSTITUTION:An original is conveyed onto original glass 19 by pinch rollers 121 and 122, etc., and a conveyor belt 125 and arranged. The pinch roller 121 is provided with a sensor SE3 for original width detection and a sensor SE5 for original length detection. The original is discharged to a tray 135 through rollers 131 and 132, etc., after being exposed by an original system 20. Then an original image obtained by the optical system 20 is projected on a photosensitive drum 10 and a developing device 14, a transfer device 15, and a fixing device 43 are put in operation to copy the image on copying paper sent from a paper feed cassette 37. If a 2nd original differs in size from the 1st original in two-sheet original feed mode, the copying machine is so controlled that copying operation is inhibited. Thus, such miscopying that a blank is formed in copying operation in two-sheet feed mode is formed is securely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a copying apparatus equipped with an automatic document feeder capable of feeding, stopping, and ejecting documents onto a platen.

Tips and Tricks In recent years, automatic document feeders (hereinafter referred to as ADF) have been developed to reduce the time required to exchange originals and eliminate 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 the originals are doubled, and a method in which two originals are reduced and copied onto one side of copy paper the size of one original (two-original single-sided copying). 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 a measure to improve these issues, ADFs that can feed two originals in parallel in the transport direction onto the document table glass are proposed, for example, in Japanese Patent Application Laid-open No. 60-2942, No. 60-84945, and No. 60-8494. It is disclosed in Japanese Patent No. 93462.

However, in copiers equipped with these ADFs, when the two-sheet original feeding mode is selected and the sizes of the first and second originals are different, these two originals are transferred onto one sheet of copy paper. When an image is created, a problem arises in that a blank space appears on the copy paper no matter what copy magnification is set.

Therefore, regarding the size of the manuscript,
As disclosed in Publication No. 62, there are first sizes such as A4 landscape, B5 landscape, letter size landscape, and A5 in which two sheets can be placed on the platen glass, and longitudinal sizes such as A4 portrait and BS portrait. a second size placed in alignment with the document conveyance direction;
Sizes such as A3, B4, legal size, and leisure size that allow only one sheet to be placed on the platen glass.
It is known that an operator can select on an operation panel.

However, it is cumbersome for the operator to input the document size one by one, and it is not possible to reliably prevent copying errors due to carelessness.

In order to solve the problems beyond the means for determining the scene, the copying apparatus according to the present invention has the following features: are juxtaposed and stopped, and
A copying machine equipped with an automatic document feeder capable of ejecting a document from the platen after completion of exposure operation, comprising H) * means for selecting a two-sheet feed mode for documents, and (i) detecting the size of the document. (iv) control means for prohibiting the copying operation in the main body of the copying apparatus if the sizes of the first and second originals detected by the detection means are different when executing in the two-sheet feed mode; It is characterized by having the following.

In configurations of 1-month or more, when running in 2-sheet feed mode, 1
The sizes of the first and second originals are automatically detected, and if the sizes of the two are different, the copying operation in the main body of the copying apparatus is prohibited. This will reliably prevent copy errors that would result in blank spaces.

Embodiments of a copying apparatus according to the present invention will be described below with reference to the accompanying drawings.

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

A photoreceptor drum (10
) is installed so as to be rotatable at a constant circumferential speed (''/) in the direction of arrow (a).A main eraser (11) and a charger (1) are installed around this photoreceptor drum (10).
2), Sub-eraser (13), magnetic brush developing device!
<14), transfer charger (15), sheet separation charger (16), blade type cleaning device (17)
) are arranged in sequence. 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), Charged chiller (12), Sub eraser (13)
The optical system (20
), and the electrostatic latent image formed on its surface is turned 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 is composed of a first mirror (22), a second mirror (23), a third mirror (24), a projection lens (25), and a fourth mirror (26). The exposure lamp (21) and the first mirror (22) are integrally formed into a block, and the photoreceptor drum (
10) It is possible to move in the direction of the arrow (b) at a speed of (V/m: m is the copying magnification) with respect to the circumferential speed (V) (constant regardless of whether the magnification is the same or variable magnification). The second mirror (23) and the third mirror <24) are integrally formed into a block and are movable in the direction of arrow (b) at a speed of (V/2m). Note that when changing the copy 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 fully stored in a fixed automatic paper feed cassette (30) and a removable automatic paper feed cassette (35) provided on the left side of the copying machine main body <1), and one of the paper feed rollers (
31) and (36) are selectively rotated to feed sheets one by one. In addition, the upper surface of the cassette (30) is a manual feed I7 paper feed section (32), from which copy paper can be fed one sheet at a time.The cassette (30) and its manual feed section (32) Copy paper fed from the paper feed section is conveyed to a pair of timing rollers (40) through a pair of conveyance rollers (33), and copy paper fed from a cassette (35) is conveyed directly to a timing roller (40). Wait here for a while.The copy paper is moved to the timing roller <4.
The toner image is sent to the transfer section in synchronization with the image formed on the surface of the photoreceptor drum (10) at step 0), is brought into close contact with the photoreceptor drum (10), and is transferred to the toner image by the corona discharge of the transfer charger (15). is transferred to the separate charger (16)
The sheet is separated from the photoreceptor drum (1o) 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 ablation means (42) and fed into a fixing device (43), where the toner image is fixed, and then passed through a pair of discharge rollers (44). It can be drained completely.

On the other hand, after the photosensitive drum (10) has been transferred, residual toner and charges are removed from the surface by a cleaning device (17) and a main eraser (11), and the photosensitive drum (10) is ready for the next copying process.

C Copy paper size detection] Micro switches (SWI) to (SW4) are installed in the paper feed section.
).

(SW5), (SW6) ~(SW9), (SWI
O) Facility $ Race C I6゜F
)~(SIJ4), (SW6)~(SW9)! t
Copy paper (7) is turned on and off according to the position of the width direction regulating plate, etc., and is set in cassettes (35) and (3o) based on the 4-bit code corresponding to the combination of on and off. Perpendicular to the copy paper size and paper feed direction.

Detects which direction the device is installed horizontally.

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

[B4, [B51. [B6, [A4], l:
A5].

For [B5], vertical or horizontal can be selected. In addition, the switches (SWI) to (SW4> also detect the attachment/detachment of the cassette (35). Table 1 below shows an example of a food table using the switches (SWI) to (SW4).
In this table 1, 10" indicates the switch is on, and 1 indicates the switch is off.
1'', and if all the switches are off, it means that the cassette (35) is not installed in the paper feed section.The current set of switches (SW6) to (
SW9) also performs similar detection.

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

(Sen10) are cassettes (35) and (30), respectively.
) directly detects the presence or absence of copy paper.

[Table 1] [Mechanism and paper passing for double-sided/composite copying] The duplex/composite unit (70) roughly 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).
) A sorter (90〉) 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>), passes through 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 discharge mode, the switching claw (71) is set to the dotted line position in FIG.
(72) is set to the solid line position, and the single-sided copy paper 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 single-sided copy paper is fed into the paper refeed cassette (81>). The copy paper that has been copied is immediately conveyed to the paper refeed path box (60).

[Configuration and operation of automatic document feeder (ADF)] A D
F (10G> is generally composed of a document feeding section (110), a document transporting section (120), and a document discharging section (130), and can be opened upward as a whole with the back as a fulcrum. Therefore, As shown in Figure 1, this A D F (100) is set on the document table glass (19) and automatically scans documents one by one or two in succession as explained below. In addition to manually transporting the document and setting it in a predetermined position on the document table glass (19), the operator can lift the document upward and place it on the document table glass (19) to perform copying.ADF The opening/closing of the A D F (100) is detected by a switch (PSW) (see FIG. 7), and the control of the A D F (100) and the copying machine main body (1) are related to each other based on this detection signal.

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 handling documents, and each roller (112), (113). ) (114), a feeding motor (not shown), and a document detection sensor (SEI).
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 set on the original tray (111) with the image side facing down, and this state is detected by a sensor (SEL>).

The pickup roller (112) is movable up and down, and is normally waiting at the top. The original 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 by the operator, the pickup roller (112) descends and presses against the top surface of the document. , feeds the top layer original by rotating.

The forward rotation roller (113) rotates in the document feeding direction, and the reverse rotation roller (113) rotates in the document feeding direction.
114) can be rotationally driven in the document return direction, and as mentioned above, together with the pickup roller (112), both rollers (
113), (114), and (114) are rotationally driven, and only the upper original is sent to the original transport unit (12G) by the rotation of the forward rotation roller (113), and the lower original is sent to the original transport unit (12G) by the rotation of the reverse rotation roller (114). The document is returned to the document tray (111) by rotation.

The document transport section (120) has pinch rollers (121), (
122) and its drive motor (123) (see 2nd @), a conveyor belt <125> and its drive motor (not shown), and a document detection sensor (SEA) <5E3).

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

That is, when the leading edge of the document sent out from the document feeding section (110) is detected by the sensor (SE2), the rotation of the pickup roller (112) and the forward/reverse roller (113) 4114>(114>) starts with a slight time delay. is stopped,
The leading edge of the document contacts the nip portion of the pinch rollers (121, 122), forming a loop on the upstream side thereof. This corrects the skew of the original.

Kira, the original is pinch roller (121), (122)
The document is conveyed onto the document table glass (19) by the rotation of the document and the normal rotation of the conveyor belt (125) in the direction of arrow (e). 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 (18
) outputs a copying operation start signal to the copying machine body (1
) starts the copying operation. Then, 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 <12
5> is driven to rotate normally 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) is measured using a pulse signal from a 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 by counting the number of pulses while the original passes the sensor (SE2), Obtaining document length signal.

Further, the width of the document is detected by a sensor (SE3) and classified into two categories. In this example, this sensor (SE3) is [A
4 ], [B s E is set in the position where it is detected (on) when the document is fed horizontally, and is not detected (off) when it is fed vertically. As a result, it is not possible to determine the document length using only the document length signal [A4, [A5,
The size of [B 4], [B s], etc. and whether it is vertical or horizontal are identified.

The document ejection section (130) has ejection rollers (131>, (1
32) and (133), <134), the surrounding guide plate and 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 image exposure scanning for the number of copies and a document exchange signal is output from the copying machine main body (1), the conveyor belt (125) is driven to rotate in the normal direction, and
The rollers (131) to (134) 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 has elapsed since the sensor (SE4) detects the trailing edge of the document, that is, when the document is completely accommodated on the ejection tray (135).

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

[Operation in two-sheet original feeding mode] In this embodiment, the ADF (100) is a normal one-sheet feed mode in which originals are set one by one at a predetermined position on the original platen glass (19), and the image is ejected with the exposure scanning diameter. In addition to the feed mode, 2
You can select a two-sheet feed mode in which two sheets of originals are continuously fed onto the document table glass (19) and set in series at a predetermined position, and two sheets of originals are ejected at once after the exposure scan of the image is completed. be.

(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 3i.

The 2-sheet feed mode is selected, and the ADF start switch (
SSM) is turned on, the originals stacked on the original tray (111) are fed from the top layer original (Dl) by the rotation of the pickup roller (112), and as described above, the originals stacked on the original tray (111) are fed by the rotation of the forward/reverse roller (113), (114) and sent out from the feeding section (1i0> (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>, (122)) and forms a loop on the upstream side thereof (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 original is transferred to the original platen 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).
.

Stop it in contact with the nip part of (122) (
(see FIG. 3c), 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).
), perform the edge registration process (see Figure 3g), and then process the two originals (see Figure 3g).
i), (D2) are pinch rollers (121), (12
In step 2), the rear end and the leading end have been continuously arranged side by side in a registered state.

In this state, the pinch rollers (121), (122) and the conveyor belt (125) are driven in normal rotation, and the original (DI) is rotated forward.
, (D2) are simultaneously conveyed onto the document glass (19) (see Figure 3h), so that the rear end of the second document (D2) is at a predetermined position on the document glass (19), that is, the optical system (20
), the pinch roller (12
1), (122) and the conveyor belt (125) have stopped rotating (see Figure 31), and now the two documents <DI), (D2) are lined up in series in the conveyance direction. The document is set at a predetermined position on the document table glass (19) in a state in which the document is oriented.

(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, so if the second original is ejected in this state, the leading edge of the second original will be the same as the first. 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 a gap between them to ensure the ejection and alignment of the originals on the tray (135). There are two methods for such document ejection processing.

In the first document ejection process, the first document is
31), (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 rotated in the normal direction 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.
) is rotated (see Figure 4a), thereby rotating the original (
Di ), (D2) begin to be discharged in the direction of arrow (c), and when the leading edge of the first document (Dl) is detected by the sensor (SE4), the forward rotation of the conveyor belt (125) is stopped ( 4b), and from this state, the first document (D
l) is subsequently conveyed by ejection rollers (131) to (134), and the second original (D2) is transferred to the original platen glass (134).
9) Standby at the top and leave a space between them (see Figures 4c and 4d).

When the rear end of the first document (Dl) is detected by the sensor (SE4), the conveyor belt (125) is driven forward again (see Figure 4e), and the two documents (Di) and (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 (131)
(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 FIG. 5a). At this time, the document conveyance speed by the discharge rollers (131) to (134) is set to be 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) and (D2) are discharged onto the discharge tray (135) with appropriate intervals.

Note that the upstream ejection rollers (131) and <132> may be set to the same document conveyance speed as the conveyance belt (125). In this case, the ejection rollers (131) and <132>
132) is a discharge roller (133) with a high conveyance speed;
When the document is conveyed in step (134), 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-mentioned two-sheet feeding mode is selected, if the total number of original sheets is an odd number, the documents will be fed in one set of two sheets. Eventually, only one manuscript will exist. Therefore, one final document is fed to the sensor (SEI).
When the original empty signal is output at , the final original is processed in the single-sheet feeding mode.

[Automatic optimum magnification setting function (AMS-)] Next, in this copying machine, when the operator specifies the copy paper size and original size, the image may be cut off on the copy paper of the selected size. Automatic optimum magnification setting function (hereinafter referred to as AM
(denoted as S).

When this AMS mode is selected, the second CPU (202
), the document size is determined and hooded, and the first CP
Can be sent to U (201>). 1st CPU U (201)
calculates the optimum copy magnification from the original size code and the size hood 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.

The original size and copy paper size in the AMS mode in the normal copying mode in which originals are transported one by one to the table 2a below, and calculations based on them.

This shows the relationship with the set copy magnification.

On the other hand, in the two-sheet feed mode in which two originals are transported as a set, copying is prohibited if the size of the second original is different from the size of the first original, as detailed below. Therefore, the sizes of the first and second originals are always the same. Therefore, the optimum copying magnification when copying is executed in the AMS mode in the two-sheet feed mode is the value obtained by dividing the length of the copy paper in the conveyance direction by the length of the first document in the conveyance direction. A when selecting 2-sheet feeding mode in table 2b below
The relationship between original size, copy paper size, and copy magnification that can be calculated and set based on them in MS mode is shown.

For example, the copy paper size is [A4 portrait] and the original size is [
For A4 landscape paper, the optimum copying magnification in the two-sheet feed mode can be calculated as [0,707 times], and this magnification is set. Also, the copy paper size is [B6! ], if the document size is [A4 landscape], the operator is prompted to manually set the copying magnification because there is no optimal copying magnification.

[Automatic optimum copy paper size setting machine flU (APS)] In addition, this copying machine selects copy paper of a size that allows the original image to be formed without image cut-off when the original 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 in which the copy paper size is set.

When this APS mode is selected, the second CPU (20-
In 2), the document size is determined and hooded, and the first CP
It is sent to U (201). 1st CPU (201
) calculates the optimal copy paper size from the original size code and the copy magnification selected by the operator, and selects the paper feed section, ie, the cassette (30), (35), in which copy paper of the calculated size is set. 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 3a 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.

On the other hand, in the two-sheet feed mode, as explained in the AMS section above, the size of the first and second sheets is the same, so the optimal copy paper when copying in the APS mode is
The copy paper has a size that is twice the length of the first document in the transport direction multiplied by the copying magnification. Table 3b below shows the original size, copy magnification, and calculations in APS mode when two-sheet feed mode is selected.

This shows the relationship with the set copy paper size.

For example, the original size is [B5 portrait] and the copy magnification is [0,
816 times], the optimum copy paper size in the two-sheet feeding mode can be calculated as [A4 portrait], and the paper feed section in which A4 size sheets are loaded vertically is automatically selected. Also, if the document size is [A4#fl], [1,008]
Since there is no optimum copy paper size no matter which magnification is set between [1,430] and [1,430], the operator is prompted to manually select the paper feed section.

[See the margins below [Original double magnification in 2-sheet feed mode, relationship with copy paper]AD
When operating F(100) in two-sheet feed mode and copying two original images on one side of one copy paper, the original size, copy magnification, and copy paper size have the following relationship.For example, When two sheets of A4 horizontally threaded originals have been conveyed, if the copy magnification is [1,0001], by selecting A3 as the copy paper, the original images for two A4 sheets of horizontally threaded paper will fit on the A3 copy paper. . Furthermore, if the copy magnification is [0,707], by selecting A4 lengthwise 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].
] If A4 vertical copy paper is selected, and the copy magnification is set to [0,707], the original image of two A4 horizontal pages will be printed on one copy paper as above. You can pay just the right amount.

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. Furthermore, if the copying machine body (1) is equipped with a book division function, that is, a function that exposes and scans the image of a book document one side at a time, it is possible to use the two-sheet feed mode, book division function mode, and double-sided copy mode together. , it is possible to form images of two originals on the front and back sides of one sheet of copy paper. These copying modes further save copying paper and copying time.

[In Figure 6, the operation panel (15) of the copying machine main body (1)
0) is 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 to start the copying operation, (152) is the numeric keypad for setting the number of copies, etc., and (153) is the stop key for canceling the multi-fubi midway, and the number of copies to be set. (154) is an interrupt key for executing interrupt copy.

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

A copy mode switching key (156) is used to switch to either composite copy, and a magnification selection key (156) is used to set the copy magnification to a preset magnification or an arbitrary magnification. <157) is a copy paper selection key for selecting a copy paper size, and (158) is the AMS.

A document size detection mode selection key (159) is used to select either APS or manual mode, and a feeding mode selection key (159) is used to select the document feeding mode from one-sheet feeding to two-sheet feeding.

The operation panel (150) further includes 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) is a normal copy, (167) is a double-sided copy, and <168) is a 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 that displays the two-sheet feed mode, and these various LEDs are rotated every 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, and the input/output configuration of CPU U (201
), (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), the micro switch (SW) installed in the paper feed section
I) Switch matrix <2 including ~(5$/10) etc.
03> is connected, and this switch matrix (2
03) and the display segment (
160), a matrix (204) consisting of display LEDs;
) are connected. Further, the output boat outputs on/off signals to the main motor, developing motor, etc. in the copying machine main body (1). A pulse signal of the main motor is input to the terminal (B1).

The input port of the second CPU (202) has an ADF
(100) open/close detection switch (PS$J),
ADF start switch (S), sensors (SEL) to (SE4) that detect the conveyance of the original, sensor (SE5) that detects the rotation of the pinch roller motor (123)
is connected. The output boat has a pickup row.
7<112), forward/reverse roller (113), (114
), a transport motor that drives the transport belt (125), a solenoid that moves the pickup roller (112) up and down, and discharge rollers (131) to (134).
) is connected to the ejection motor that drives the motor. Terminal (B
In 2), the pulse signal of the transport motor is input.

In addition, a clock terminal (SCK) for data sampling and output of the first CPU (204), and an interrupt output terminal (
PCO), data output terminal (SQLIT) 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 is started, 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 l''1'' from the completion of the copy start process until the end of the copy process.

Mode flag (Fl): A D F (100) This flag is used to indicate the teno original feeding mode. It is set with the feeding mode selection key (159), and when it is 1″0, it indicates the single sheet feeding mode. 1” indicates two-sheet feeding mode.

Feed flag (F2): This is to indicate the number of originals actually fed onto the original platen glass (19) at A D F (100), and indicates one sheet when "rO". Even if the two-sheet feeding mode is selected, in which "1" indicates two sheets, if the total number of original sheets is an odd number, the final original is transported at "rO". Note that this flag (F2) is set by the feed number signal from the 20th P U (202).

Calculation flag (F20): AP S mode, AM
It can be used to calculate copy paper selection and copy magnification settings in S mode, and is set according to the document feed mode and the actual number of sheets to be sent. That is, when the value is 10, the calculation is performed by feeding one sheet, and when the value is ``1'', the calculation is performed by feeding two sheets.

Returning to the routine, in step S2, the first CPU (2
01> main timer is set. 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 (S3) to (S5) are sequentially called. Step (S3) 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 floppy mode using the copy mode switching key (155), and the process of setting the magnification using the magnification selection key (156). .

Step (S4) is a subroutine for document feed mode switching processing, in which A D is selected using the feed e-mode selection key (159).
F (100) Execute the document feed mode setting process. Step (55) is a subroutine for copy start processing, which processes the start of a copy operation.

Next step (S6) Tecohee Flak (FO) Ka r1
If it is reset to ``0'', the process moves to step (S8), and if it is set to ``1'', the process proceeds to step (S7) where the actual copying operation is performed. The subroutine is executed and the process moves to step (S8). In step (S8), data transmission and reception with the second CPU (202) is processed. This step (S
8), the signals communicated by the first CPU (20
The signals transmitted from 1) to the second CPU (202) include a copying operation signal, a document feed mode signal, and a document exchange signal when image exposure scanning for a set number of sheets is completed. From the second CPU (202) to the first CPU (
The signals sent to ADF (10
When a document is loaded into the document tray (111) when the document tray (111) is not in operation, the signal is set to 11'' and is reset to 10'' when the final document is ejected.

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 is output when the size of the fully fed original 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, various timers can determine the end of counting based on how many times this one 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 (510) the copy flag (FO) is set to 1.
If the 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 It is determined whether the flag (Fl) is "0". If the mode flag (Fl) is reset to r
513) ``??Momo-F 7 Rough (Fl)wo'l
Set to J, that is, set the two-sheet feed mode, and return to the main routine. On the other hand, if it is determined in step (512) that the mode flag (Fl) is set to "11", the mode flag (Fl) is set to "0" in step (514).
In other words, set to single sheet feed mode.

Figures 10a and 10b show the main routine steps (
This shows a subroutine of the copy start process executed in S5), in which processes in APS mode and AMS mode are also executed.

First, in step (520), the ADF mode signal is set to “IJ
If rl is set, 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 activated, step (
522), it is determined whether a set completion signal is output. If this set completion signal is not output, it will remain on standby, and if it is output, that is, if the original is set at a predetermined position on the document table glass (19) [step (5170)].

(5212)], and in step (527) it is determined whether the mode flag (Fl) is rl. mode flag (
If Fl) is reset to 10, step (52
8), reset the calculation flag (F20) to "0."
If the calculation flag (F20) is set to ``1'' in step (529), the calculation flag (F20) is set to ``1.
32).

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

If it is determined in step (520) that the ADF mode signal has been reset to 10'', step (523) is performed.
After confirming that the copy flag (FO) has been reset to "O4" in step 524, it is determined whether the print switch (151) is on-edge or not. If so, the copy flag (FO) is set to I'' in step (525).
1” and return to the main routine.

Next, in step (532) it is determined whether or not the APS mode has been selected, and if the APS mode has been selected, step (53
In step 3), it is determined whether the calculation flag (F20) is "0" or not. If the calculation flag (F20) is reset to "0.", that is, if the APS mode is fully selected in the single-sheet feed mode, the optimum copy paper size calculation is performed based on the table 3a in step (534). Execute the process of ■,
The process moves to step (536).

Further, if the calculation flag (F20) is fully set to 11'', that is, if the APS mode is selected in the two-sheet feed mode, the optimum copy paper size is calculated based on the table 3b in step (535). Execute the process of ■,
The process moves to step (536).

Next, in step (536), the step (534)
Alternatively, in (535) it is determined whether there is a cassette loaded with copy paper of the calculated size. If there is a corresponding cassette, select and set the corresponding cassette in step (537), set the copy flag (FO) to "1" in step (54g >) and return to the main routine.If there is no corresponding cassette, step (538) outputs that no copy paper of the optimum size is loaded in any of the cassettes, and warns the operator by appropriate display means (for example, display segment (160)).

On the other hand, if it is determined in step (532) that the APS mode is not selected, it is determined in step (539) whether or not the mode flag (Fl) is 11''.

If it is reset to "0", that is, if it is the one-sheet feeding mode, the process moves to step (541). If the mode flag (Fl) is set to "1", that is, if it is the two-sheet feeding mode, it is determined in step (540) whether or not the selected copy sheet is vertically threaded.

If it is vertical printing, the process moves to step (541), and if horizontal printing, a prohibition display is output in step (549) to prohibit the start of the copying operation. This means that in the two-sheet feed mode, if the copy paper is passed horizontally, no matter what size the two originals conveyed onto the original platen glass (19) are (in this example, they are the same size originals). This is due to the fact that it is impossible to set a copying magnification that will completely fit two side-by-side original images onto a side-by-side copy sheet (although this is limited). Incidentally, when the copying operation is prohibited in this way, the operator only has to select the copy paper again to be paper-threaded.

Next, in step (541), it is determined whether the AMS mode is selected, and if it is not selected, the copy flag (FO) is set to "rl" in step (54g), and the process returns to the main routine. If the AMS mode is selected, the calculation flag (F20) is set to r in step (542).
It is determined whether the result is "O" or not. Operation flag (F20) is “0”
If the calculation flag (F20) is set to rl, the optimum magnification calculation process (■) based on the table 2a is executed in step (543), and the process moves to step (545>).If the calculation flag (F20) is set to rl, , In step (544), the process of optimum magnification calculation (2) based on the table 2b is executed, and the process moves to step (545).

Next, in step (545), the step (543)
Or it is determined whether the copy magnification calculated in (544) is within the specifications of the machine. If there is, step (546)
The magnification calculated in step (548) is set, the copy flag (FO) is set to "1", and the process returns to the main routine. If there is no corresponding magnification, step (547)
outputs that the corresponding magnification does not exist, and warns the Oopaque by an appropriate display means [for example, display segment (160)].

Step (525') as above. By setting the copy flag (FO) to 11'' in (548>), the copying process in step <S8> is started. In addition,
Copying processing and control of APS mode and AMS mode are well known, and their explanation will be omitted.

Figure 11 shows the 20th P that controls A D F (100).
The main routine of U (202) is shown.

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 in the initial mode.

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

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

ADF operation flag (F3): ADF (100
) indicates that it is in operation, and W is set to 11'' from the start of document feeding until the final document is ejected.

ADF feeding flag (F4): ADF (100
) is used to indicate that the document is being fed, and r1. It can be 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. Ru.

Tip registration start flag (F6): This is to indicate the timing to start the tip registration process, and is set to 1.
It is set to "1" from the start of feeding the first and second originals until the feeding motor and pickup roller (112) start up.

Waiting flag (F7): This is to indicate that the document is waiting at the leading edge registration position, and is set to "1" from the completion of leading edge registration processing until the feeding resumes onto the document table glass (19). be done.

Set completion flag (F8) 8 *Document tray (111)
This is to indicate that the original fed from the original is set in a predetermined position on the original platen glass (19).
It is set to 11'' from the end of feeding until the start of discharge.

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). I can complete the set.

Original flag (FIO): Indicates whether the original being fed in the two-sheet feeding mode is the first or second sheet.When it is "0", it indicates the first sheet, and when it is "11", it indicates that it is the first sheet. , it indicates that it is the second sheet.

Returning to the routine, in step (5101) 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 (55) 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 rl. Mode flag (Fl) is F0
If it is reset to 4, that is, if it is the one-sheet feeding mode, the subroutine of step <5107) (5110) is called and the process moves to step (5112). Step <5107) executes a process of feeding and setting ordinary originals one by one onto the original platen glass (19). Step (5110) executes a process of ejecting one document onto the ejection tray (135).

In the step (5106), the mode flag (Fl) is set to “
If it is determined that the original is set at 1°, that is, if the two-sheet feeding mode is selected, then in the subroutine of step (st08), the originals are fed and set 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 11'', and if it is set to ``1'', the step (Sill
) subroutine to output two originals to the output tray (135).
Then, the process moves to step (5112). If the feed flag (F2) is reset to "0.", the subroutine of step (5110) is executed and the process moves to step (5112).

In step (5112), data transmission and reception with the first CPU (201) is processed. The signals communicated here are the same as those explained in the process of step (S8).

When the processing in each of the above subroutines is completed, the process waits for the main timer to finish counting in step (stt3), and then returns to step (5101). The time length of one routine is used to count the various timers that appear in each subroutine.

FIG. 12 shows the subroutine of the ADF start process executed in step (5103) of the main routine of the 20th P U (202).

First, in step (5120), check whether the copy flag (FO) has been reset to "0."
In step 1), check whether the ADF operation flag (F3) has been reset to "OJ" or not, and in step (5122), the document tray (
111) Determine whether the upper sensor (SEI) is on or not, and if any of them is No, return to the main routine immediately, and if both are YES, that is, copy operation.

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 in step (5125)
), set the ADF operation flag (F3) to 1, set the ADF feed flag (F4) to rl in step (5126), and set the tip registration flag (F5) in step (5127). and tip registration start flag (F
6) to "1." Next, set step (51).
In step 28), it is determined whether the mode flag (Fl) is rl or not, and if it has been set to ``1.'', the feed flag (F2) is set to ``1'' in step (5129) and reset to '0''. If so, in step (5130) the feed flag (
F2) is reset to "0" and this subroutine ends.

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

First, in step (5140), the tip registration flag (F
5) is "11" or not, and if it is reset to "0", it immediately returns to the main routine, and if it has been set to "rl", the leading edge 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 "rl", 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). Then, in step (5143), the leading edge registration start flag (F6) is reset to "0.", and 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) is performed.
146), and if it becomes on-edge, proceed to 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 count end 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 (5148).
) to reset the tip registration flag (F5) to 0, and in step (5149) set the standby flag (F7) to rl.
, and end this subroutine.

In this way, the leading edge of the document sent out from tray <iii> is semi-contacted with the nip portion of the pinch rollers (121) and (122), and the skew is corrected. (See Figure 3b).

FIG. 14 shows a subroutine for document size detection processing executed in step <5105> of the main routine of the second CF U (202). This is executed while the original is being fed to the original position, and the sensor (SE5) detects the length of the document in the conveying direction by pulse counting, based on the combination of the on/off of the sensor (SE3) that detects the width direction. Determine the original size.

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

This pinch roller motor (123) follows the steps below (
5164). If it is not rising, the process moves to step (5152), and if it is rising, the pulse count of sensor (SE5) is started in step (5151), and the process moves to step (stsz>).In step (5152), the pulse count of sensor (SE2) is started. When off-edge is confirmed, the sensor (SE5) pulse count is allowed to stop in step (5153), and 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.

Figure 15 shows the 2nd CPU (202) (7) Me4
The subroutine of document feeding process (2) in single-sheet feeding mode that can be executed in step (5107) of run-f is shown.

First, in step (5160), the ADF feeding flag (F4
) is "1." If it is reset to "0", return to the main routine immediately.% "If set to IJ, that is, when ADF start switch <SSW> is turned on , the standby flag (F
7) is "1" or not. If the standby flag (F7) has been reset to "0", the process moves to step (5166), and if it has been set to '1', that is, the leading edge of the document is registered by the pinch rollers (121) and (122). If so, the discharge flag (F
9) Determine whether the force is 0. If the discharge flag (F9) is already set to "rl", step (5164)
, and if it is reset to “O”, step <5
163), turn on the transport motor, and step (5164)
Turn on the pinch roller motor (123) with step (
At step 5165), the standby flag (F7) is reset to rOJ and the process moves to step (5166). With this, feeding of the original from the leading edge registration position onto the original platen glass (19) is 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).
Set the stop timer at step <67>, and proceed to 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) 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 "1" in step (5173), and then
174), set the tip registration start flag (F6) to “1”.
In step (5175), the ADF transport flag (F4) is reset to "0" and this subroutine is ended. Also, in the step (5172), the sensor (
SEI) is off, i.e. the tray (111)
If there are no more originals, in step <5175)
The DF feeding flag (F4) is reset to "0" and this subroutine ends.

Figures 16a and 16b show a subroutine for document feeding processing in the two-sheet feeding mode that is executed in step (5108) of the main routine of the second CPU (202). If the size of the first original and the second second original are both the same size and the entire exposure area [the area where the original image can be scanned by the optical system (20)] is less than half the size, two-sheet feeding is 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 11'' or not. If it is reset to ``0'', the main routine is immediately returned to. (5181) is the original flag (F
IO) is 10. 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 "1" or not. If the standby flag (F7) is reset to "0", the process moves to step (5187), and if it is set to "rl", that is, if the leading edge registration process for the first document is completed, In step (5183), the discharge flag (F9
) is “0”. The discharge flag (F9) is “
1", one set of originals is already being ejected and the transport motor is turned on, so step (51) is set.
85), and when it has been reset to "O", 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 “0”
and moves to step (5187). As a result, the feeding of the first original from the leading edge registration position onto the original platen glass (19) is resumed (see FIG. 3c).

In step (5187), it is determined whether the sensor (SE2') is off-edge or not, and if it is not off-edge, step (
5193), and if it is off-edge, proceed to step (5193).
In step 188), it is determined whether the document size is less than half the total exposure area. The desired copy form in the two-sheet feed mode is to form images of two originals on one sheet of copy paper, as described above. Therefore, you can place two originals on the original platen glass (19
) The size when juxtaposed on the paper needs to be smaller than the exposure area determined by the copy paper size and copy magnification. At the same time, the two originals must be the same size, and each original must be less than half the total exposure area.For example, if the copy paper is A3 lengthwise and the copy magnification is equal to , the exposure area is 420 mm, and the original size is half that size (A4 landscape, B
(S landscape, A5 landscape, A5 portrait).

Therefore, if it is determined in step (5188) that the document size is more than half of the total exposure area, the document image cannot fit on the copy paper, so in step (5206) a prohibition signal is sent to the first CPU ( 201), reset the ADF feeding flag (F4) to 10'' in step (5207), and reset the discharge flag (F9) in step (520g>).
) to rl, instructs to eject the original, and returns to the main routine. If the i draft size is less than half of the total exposure area, the sensor (SEI) is
') is on, and if it is not on, that is, the second document is not on the tray (111), and the first document being fed at this time is the final document. For example, in order to process it as the second document, step (5190
> sets the original flag (FIO) to "rl", and in step (5191) resets the feed flag (F2) to "0.", and moves to step (5209).

If the sensor (SEL) is on in the step (5189), that is, the second document is 1 to ray (111).
If so, 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.
Step 4) turns off the conveyance motor and the pinch roller motor <123) (see Figure 3d), then step (5195)
) to 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 (5195), the tip registration flag (F5) and the tip registration start flag (F5)
6) in the IJ and prepare the leading edge registration process for the second document. At the same time, step (5197)
The reverse rotation timer is set in step (5198). This reversal timer is set to the time from when the document is fed backwards until the trailing edge is brought 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 ($199), turn off the reverse rotation of the transport motor, and in step (5200), set the document flag (FIO) to process the second document. Set to "1". With this, the trailing edge of the first document is attached to the pinch roller (1
21>, comes into contact with the nip portion of (122) and waits in a state where the resist is finished.

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 '1', that is, if the subroutine of step (5104) has been executed and the leading edge registration process for the second document has been completed, [
See step (5149)], turn on the conveyance motor and pinch roller motor (123) in step (5202), and set the standby flag (F7) to "0" in step (5203).
and moves to step (5204).

As a result, the first and second originals are quickly read and fed onto the original platen 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) is performed.
210), and if it is off-edge, that is, at the time the trailing edge of the second document passes the sensor (5E2), the size of the second document becomes 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 "0." in step (5207). , the discharge flag (F9) in step (5208)
is set to rl, instructs to eject the original, and returns to the main routine. 1st. If the second original is the same size, a stop timer is set in step (5209), and a stop timer is set in step (5209).
5210). This stop timer is the same as the one set 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 rl in step (5213), and step (5214)
The original flag (FIO) is reset to rOJ. 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 (SEI) is on or not. In order to pre-process the tip resist as shown in FIG.
In step 16), the leading edge registration flag (F5) and leading edge registration start flag (F6) are set to 11'', and in step (5217), the ADF feeding flag (F4) is set to 10. to end this subroutine. In addition, if the sensor (SEL) is off, that is, the tray (111)
If there are no more originals, in step <5217)
The DF feeding flag (F4) is reset to 10'' and this subroutine ends.

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 discharge flag (F9) is set to 11'' when the copying machine main body (1) completes image exposure scanning for the number of copies of the original and the original exchange signal is output. Therefore, if the discharge flag (F9) remains reset to "OJ", the main routine is immediately returned and "1
”, 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) ) to complete the set flag (
F8> is reset to 10'' 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), it is determined whether the sensor (SE4) is off-edge, that is, whether the trailing edge of the document has passed the sensor (SE4). If so, step (
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 it is cut off.

Therefore, in step (5226), the ejection timer finishes counting, and then in step (5227), 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. If the standby flag (F7) is set to "1.", the ADF feeding flag (F4) is set to "1." in step (5232) in order to execute the feeding process.
and moves to step (5233).

If the standby flag (F7) has been reset to "0",
That is, if the document ejected at this time is the final document, the transport motor is turned off in step (5229), and step (5229) is performed.
5230), the ADF operation flag (F3) is reset to "0", and step (5231) sets the ADF mode signal to 1.
0'' and output to the first CPU (201), and the process moves to step (5233).

In step (5233), the discharge flag (F9) is set to "0.
, and in step (5234) set the mode flag (
Determine whether the mode flag (Fl) is “1.
) has been reset to '0', that is, if the mode is one-sheet feed mode, the process returns to the main routine. If the mode flag (Fl) is set to rl, that is, 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 a subroutine for document ejection processing in two-sheet feed that is executed in step (Sill) of the main routine of the second CPU (202). In this subroutine, the first document is ejected when the document is ejected. Laura (131),
(132), the conveyor belt (125)
Temporarily stop the drive and place the second document on the document glass (
19) After temporarily waiting on the top and leaving an appropriate gap between the two originals, the conveyor belt (125) is rotated again and the two originals are placed on the ejection tray (135) in a well-aligned manner. be discharged.

Specifically, steps (5240) to (5243) are the same as steps (5220) to (5223),
The discharge flag (F9) and set completion flag (F8) are “1”.
”, the discharge process is started (see FIG. 4a), and in step (5244) it is determined whether the sensor (SE4) is on-edge. Sensor (S
If E4) is not on-edge, the process moves to step (5247), and if it is on-edge, it is determined in step (5245) whether or not the document flag (FIO> is 10). If it has been reset, that is, if the document whose leading edge was detected by the sensor (SE4) in step (5224) is the first document, 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, it is determined in step (5248) whether or not the document flag (FIO) is "1°."
．． If it is reset to , that is, step (5247
), if the document whose trailing edge is detected by the sensor (SE4) is the first document, the transport motor is turned on in step (5250), and the document flag (FIO) is set in step (5251).
) to "1" 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) can be resumed (see FIG. 4e).

On the other hand, in the step (5248), the original flag (FIO
) is set to I"1", that is, if the document whose trailing edge was detected by the sensor (SE4) in the step/branch (5247) is the second document, the step (5
Set the ejection timer in step (249) and proceed to step (5252).
).

Steps (5252) to ($257) are the steps (5252) to ($257) described above.
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 (5258) ], if the final document has been ejected, execute end processing [step (5254)
YES, steps (5255) to (5257) l.

Subsequently, in step (5259), the discharge flag (F9) is reset to "rO", and in step (5260), the original flag (FIO) is reset to "10", and this subroutine ends.

FIG. 19 shows another subroutine of document ejection processing (2) in two-sheet feeding, which is executed in step (Sill) of the main routine of the second CPU (202).

In this subroutine, the discharge rollers (131) to (134)
) is set higher than the original transport speed by the transport belt (125), and the two originals are discharged onto the discharge tray (135) in good alignment with an appropriate interval between them.

Specifically, steps (5270) to <5273) are the same as steps (5240) to (5243) and (5220).
) to (5223), and the discharge flag (F9)
, the discharge process is started when the set completion flag (F8) is set to 11''. In this case, the document conveyance speed by the discharge 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 is gradually increased. (See Figures 5a and 5b).

Next, in step (5274), it is determined whether the sensor (SE4> is off-edge or not. If the sensor (SE4) is not off-edge, the process moves to step (5278), and if it is off-edge, the document flag ( F.I.O.
) is 11''. If the original flag (FIO) is reset to 0°, that is, step (52
If the document whose trailing edge has been detected by the sensor (SE4) in step 74) 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) is set to 11, that is, 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 steps (5252) to (5260) above, and the ejection motor is turned off when the ejection timer finishes counting [YES in step (5278), step (5279)]. , start feeding the next document and end this subroutine [NO in step (5280), step (5284)]
) ~ (5286)], if the final document is to be ejected, execute the end process and end this subroutine [YES in step (5280), step <5281)
~(5283).

<5285>, (5286)].

[Main part of the embodiment] In the above configuration, the sizes of the first and second originals are automatically detected when the original is fed in the two-sheet feeding mode.
Refer to Figure 14. If it is determined that the two sizes are different [No in Figure 16b, step (5205)], copying is prohibited from now on [Figure 16, step (5206)]
, and then place the original that has already been transported on the original platen glass (
19) It will be discharged from above [see the same figure, step (
5207), (5208) ], :: By doing so, it is possible to reliably prevent misprints that would result in blank spaces in the two-sheet feeding mode.

[Other Examples] Note that the present invention is not limited to the above-mentioned embodiments, and can be variously modified 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 advance and retreat 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 feed mode is selected and the ADF start switch <5SW) is turned on, the pinch roller (121) first moves away from the lower roller (122), and the game 1- (129) Enter into the feed route. The originals stacked on the original m tray (111) are fed from the top layer original (Dl) by the rotation of the pickup roller (112), are sorted by the forward/reverse rollers (113) and (114>, and then the leading edge are pinch rollers (121), (122
) and comes into contact with the gate (129), where the tip resist processing is performed (see FIG. 20a). Thereafter, the gate (129) is retracted from the feeding path, the pinch roller (121) comes into pressure contact with the lower roller (122), and the rotation is completed, and the conveyor belt (125) is also driven in the normal rotation. . With this, the rear end of the original (Dl) is at the gate (129).
) (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) is indicated by the arrow (C'')
The original (Dl) is reversely driven in the direction shown in FIG. Feeding the second document (D2) on the document tray (111) with the trailing edge registration process applied to Dl),
Perform edge registration processing, and with this, two originals (D
i) and (D2) are successively arranged side by side 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 forward, and the originals (DI) and (D2) are simultaneously fed onto the original platen glass (19) (see Figure 20d), and after the second original (D2) When the edge reaches a predetermined position on the document platen glass (19), that is, the exposure start position by the optical system (20), the pinch roller (121)
, (122) and 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). It is also possible to switch back the document by providing a stopper with a
125) is reversed and switched back to position the rear end of the document in contact with the stepped portion or stopper.

In addition, in the present invention, two originals are placed on the original table glass (1
9) Various means other than the above-mentioned methods may be used for placing the originals side by side. For example, in the sorting section when feeding the originals, the second original is placed next to the first original. Alternatively, the document conveying belt (125) may be moved two times in the conveying direction.
It is also possible to adopt a method of dividing and installing. In this case, when ejecting the original, the timing of the ejection drive of the conveyor belt that holds the second original may be delayed, or the ejection speed may be set to be slow, thereby creating an appropriate space between the original and the first original. The output tray (13
5) It is possible to discharge above.

Moving bed of the invention As is clear from the above description, according to the present invention, when the first and second originals have different sizes when executed in the two-sheet feeding mode, the copying operation in the main body of the copying apparatus is changed. Since this is prohibited, it is possible to reliably prevent misprints that result in blank spaces when copying in the two-sheet feed mode, thereby improving usability.

[Brief explanation of drawings]

1 to 19 show an embodiment of a copying apparatus according to the present invention, FIG. 1 is an internal configuration diagram as a copying system, and FIG.
The figure is a perspective view with a part of the ADF cut away, Figures 3a to 3.
Figure 1 is an operation explanatory diagram showing the document feeding process, Figures 4a to 4
Fig. c is an explanatory diagram of an operation showing one example of the document ejection process, and Figs. 5a to 5c are explanatory diagrams of the operation showing other examples of the original ejection process.
FIG. 6 is a plan view of the operation panel, FIG. 7 is a block diagram of the control circuit, and FIGS. 8 to 19 are flowcharts showing control procedures. FIGS. 20a to 20d are operation explanatory diagrams showing document feeding processing in a modified example of the registration means. (1) Copying machine main body, (100) Automatic document feeder (ADF), (110) Original feeding section, (1
11)...Document tray, (112)...Pickup roller, (120)...Document transport unit, (121)...
), (122)...pinch roller, (125)...
・Transport belt, (129)...Gate, (130)・
...Document output section, (135)...Ejection tray, (15
g7 ”)...Copy paper selection key, (159)--Feeding mode selection key, (SEI)-(SE4)...Photo sensor for document detection, (SE5)...Photo sensor for pulse count, (S Ken 1) ~ (SW 4), (Sen 5)
~(SW9)...Copy paper size detection switch.

Claims (1)

[Claims] 1. It is possible to stop two originals fed from the original feeding unit in parallel in the transport direction at a predetermined position on the platen, and to eject the originals from the platen after the exposure operation is completed. A copying apparatus equipped with an automatic document feeder having the following features: means for selecting a two-sheet feed mode for a document; means for detecting the size of the document; A copying apparatus comprising: control means for prohibiting a copying operation in a main body of the copying apparatus when the detected sizes of the first and second originals are different.