JPH06138737A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the generation of a blank part even when the number of originals is odd even if it is the image forming device of a parallel copying mode. CONSTITUTION:In the parallel copying mode for forming an image of two sheets of originals P on one sheet of a transfer sheet S, the odd and even of the batch of originals P is discriminated by an odd and even discrimination means 102. When the number of originals is odd, control is carried out by a controller 100 to form the image of the final page in a position corresponding to the odd number of originals of a transfer sheet (for example, the left side). Thus, the parallel copying mode can be realized without having the blank page within the continued pages of the transfer sheet after image formation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a platen of an image forming apparatus in which two or more originals are replaced by two from the lower side and the front and rear of the originals are replaced by a circulating original conveying apparatus provided in a copying machine or the like. The present invention relates to an image forming apparatus provided with a parallel copying unit that conveys sheets to each other. Specifically, when the number of document bundles is an odd number,
The present invention relates to a method of controlling the last page of the original bundle.

[0002]

[Prior art]

<Prior Art 1> Conventionally, a circulation type document feeder is used to
As a method of forming an image of one original on the same surface of one transfer sheet, JP-A-60-2942 and JP-A-60-84 are known.
No. 945, Japanese Patent Application Laid-Open No. 60-93462, etc., a method of feeding and placing two originals on the platen in parallel with the conveyance direction from the subsequent page (hereinafter referred to as a parallel reading mode). ) Is disclosed.

With respect to the order of processing the originals, when the processing from the first page is performed, the stacking state of the originals and the transfer sheets after copying is such that the image surface faces downward (face down) and the visibility deteriorates. Therefore, the discovery of mistakes will be delayed. Further, if the processing from the last page is performed, the above problem is solved, but if the number of originals is odd in the parallel reading mode, the first page (first left side) of the transfer sheet becomes blank. .

As a solution to this problem, Japanese Patent Laid-Open No. 62-5
In the device described in Japanese Patent No. 5667, a method is used in which an odd / even setting button is arranged on the operation unit and control is changed by the signal thereof. That is, when an odd number is selected by the setting button, the blank page of the first page described above can be avoided by forming the image on the transfer sheet of only one sheet without performing the parallel reading mode on the final page. <Prior Art 2> FIG. 12 shows an example of a conventional document feeder capable of a parallel reading mode. In the figure, the original P
Is the original tray 2 with the image facing down (face down).
19 is mounted. The original 221 sent out by the feed roller 223 is conveyed to the platen glass 216 via the conveyor belts 217 and 218, the first page P ′ is placed at the first original reference position on the left side in the drawing, and the second page P ″ is It is placed at the second original document reference position via the conveyor belt 217.

A reading unit 210 having a lamp 205 and a light receiving element 209 moves left and right in the drawing by a drive motor 215 to read images of both originals P'and P ". In the parallel reading mode, both originals P '. , P ″ images are copied onto one transfer sheet S as shown in FIG.
The originals P ′ and P ″ after the image processing are discharged to the paper discharge tray 220.

FIG. 14 shows a second example of a conventional document feeder. In the figure, the document P is placed on the document tray 214 in a face-up state. The document P sent out by the half-moon roller 205 is conveyed by the conveyance roller 2
06, separated and fed by separating belt 206 one by one,
When the tip of the pair of registration rollers 208 abuts on the sensor 2,
15 is detected.

The document P fed by the registration roller pair 208 is brought into contact with the platen glass 203 of the image forming apparatus 1 by the transport belt 210 wound around the driving roller 211 and the driven roller 212. In the parallel reading mode, two originals P are sequentially fed, the first original is placed on the right side of the platen glass 203 in the drawing, and the next original is placed on the left side. FIG. 15 shows a state in which both originals P are simultaneously copied onto one transfer sheet S. After image formation,
Both originals P are discharged onto the discharge tray 202 by the discharge rollers 213.

FIGS. 15 and 19 show a third example of a conventional document feeder. In the figure, the originals P placed on the original tray 214 in the face-up state are separated one by one from the lowest one, and the platen glass 21
0 is transported above. In the parallel reading mode, the first m-th page is fed to the platen glass 210 first, and this is fed to the platen glass 210 as shown in FIGS. 17 (a) and 17 (b).
And the original of the next (m-1) th page is conveyed to the platen glass 210 as shown in FIG.
After that, the mth page and the (m-1) th page are simultaneously conveyed ((d)
(Fig.), As shown in Fig. (E), the placement state is such that the parallel reading mode is possible.

[0009]

[Problems to be Solved by the Invention]

<Problem of the First Invention> However, although the image forming apparatus described above can avoid a blank page, a blank page is generated when setting is troublesome and the operation button is forgotten to be set to a predetermined state.

In the above-mentioned conventional example, when the final page of an odd number of originals stacked is placed on the normal reference position side and the normal transfer process is carried out, the image formed on the transfer sheet is formed on the right side. As a result, a blank page is generated at the position of the first page.

Further, in copying in the parallel copying mode (copying performed in the parallel reading mode), if the transfer sheet is to be reduced in size to 1/2 and the transfer process is to be performed, the transfer sheet is not necessarily a general-purpose size. I can't say. For example, when reducing from A42 sheets to A4R, the final page is A5 size, and it is unlikely that the user has this size.

A first aspect of the present invention provides an image forming apparatus which is an image forming apparatus in a parallel copying mode, and which can easily set an odd number of sheets so that a blank portion is not generated even when the number of original sheets is an odd number. The purpose is. <Problem of the Second Invention> In the first example of the above-mentioned conventional example, the parallel copy mode is possible, but since it is a face-down placement in which the image surface of the document P is placed face down, The visibility is poor, and the two conveyor belts 218, 21
Since 9 is required, there is a problem that the device becomes complicated.

Further, in the second conventional example, the original P can be placed face up, but the second page is transferred to the left side on the copy sheet finished as shown in FIG. Since it is transferred, it cannot withstand the needs of users.

In the third example of the prior art, the m-th page is once placed on the platen glass 210, then inverted by the large roller 232 and placed on the platen glass 210. Furthermore, as shown in FIG. 17, the m-th page is retracted from the platen glass 210 again, and the (m-1) -th page is placed on the platen glass 210.
Although it is possible to obtain a proper copy paper as shown in FIG. 13, after the m-th page is once placed on the platen glass 203 and then retracted, the (m-1) -th page is sent out first. , The m-th page is conveyed on the platen glass 203 so as to catch up, so it takes a long time (original replacement time in the parallel copy mode) before the original is placed on the platen glass 203 in an appropriate state. There is a drawback that the productivity for making one copy sheet in the parallel copy mode is reduced.

It is an object of the second invention to provide an image forming apparatus in which an original to be image-formed in the parallel copy mode can be placed on the platen glass within a short time.

[0016]

[Means for Solving the Problems]

<Means of the First Invention> The present invention relates to an image forming apparatus (11) in which two or more originals (P) are replaced by two from the lower side and the front and rear thereof are replaced by a circulating original conveying apparatus (110).
0) is provided with a parallel copying means (101) for conveying onto the platen (131), and the two originals (P) placed in parallel on the platen (131) are one transfer sheet (S).
In the image forming apparatus (130) that forms an image on
An odd-even determination means (102) for determining whether the number of original bundles (P) is odd or even, and when the original bundle (P) is an odd number, the last page (2m + 1) of the original bundle (P) is A control unit (100) for controlling an image to be formed at a position (S ₀ ) corresponding to the odd number original on the transfer sheet (S).

The control means (100) delays the transfer sheet (S) corresponding to the last page (2m + 1) of the original bundle (P) by an amount corresponding to the length of one original. It is characterized in that it is a transfer timing delay means for feeding to the image forming section.

Further, the control means (100) controls the final page of the original bundle (P) from the reference lines on the front side of the two originals (P) placed on the platen (131). It is characterized in that it is a document feeding timing adjusting means which is placed by an amount corresponding to the length of one document. <Means of Second Invention> The present invention relates to an original placing table (4) on which an original (P) to be image-processed is placed, and the original (P).
First separating means (6, 38) for sequentially feeding one by one from the bottommost one, and a platen for reading an image of the original (P) separated by the first separating means (6, 38). The glass (3), the first feeding path (a, b) for guiding the separated original (P) from one end side of the platen glass (3) to the image reading portion (1A), and the original (P). ) From the image reading section (1A) and guides the document (P) to the document placing table (4), and the document (P) is provided on the side opposite to the first feeding path (A, B). A document on the document placing table (4), which is located on the opposite side of the first separating means (6, 38) via the document discharge path (e, f) carrying the document and the document placing table (4). Second separating means (14, 15) for successively feeding (P) one by one from the bottommost one
And the separated original (P) from the other end side (1B) of the platen glass (3) to the image reading section (1).
The image reading unit (1A) has one end side of the platen glass (3), the circulating document feeder (2) having a second feeding path (H, L, N) leading to A). (1A)
From the other side (1B) to perform image reading, when the image forming apparatus is set to the parallel reading mode, the original (P) of the circulation type original feeding apparatus (2) is set to the first side. The platen glass (3) is separated by the second separating means (14, 15) and is separated from the other end side (1B) of the platen glass (3) to the one end side (1).
It is characterized in that it has a control means control device (90) for carrying it to A) and placing it in parallel on the platen glass (3).

[0019]

[Action]

<Operation of First Invention> On the platen (131) of the image forming apparatus (130), a plurality of originals (P) are arranged two by two from the circulating original conveying apparatus (110) from below. It is transported with the front and back swapped. Then, the two originals (P) are image-formed on one transfer sheet (S). At that time, the original bundle (S) is detected by the odd-even determination means (102).
If it is determined that the number of sheets is odd or even, and the number of originals (P) is an odd number, the last page (2m + 1) of the originals (P) is imaged at the odd original corresponding position (S ₀ ) of the transfer sheet (S). It is controlled by the control means (100) to be formed.

Thus, when forming an image in the parallel copy mode, it is possible to form an image without generating blank pages in continuous pages. <Operation of the Second Invention> When the circulation type document feeder (2) is in the normal one-sheet copying mode, the document (P) on the document tray (4) is moved to the first position by the first separating means (6, 38). After separating the sheets one by one, they are conveyed and placed on the platen glass (3) from one end side (1A) of the platen glass (3) through the first feeding path (a, b), and the document is discharged after the image formation. It is discharged again onto the document tray (4) through the paths (e, f).

When the circulation type document feeder (2) is set to the parallel copy mode (2 in 1 mode) in which two originals (P) are image-formed on one transfer sheet (S), the original tray (4) ) The upper two originals (P) are separated one by one by the second separating means (14, 15), and then the platen glass (3) is passed through the second feeding path (H, R, N). The other end side (1B) of the sheet is conveyed and placed on the platen glass (3).

As a result, even though the originals on the original tray (4) are placed face up and are of a paper feed type in which the originals are sequentially fed from the lowest position, the originals fed out at the time of setting the originals in the parallel copy mode. In this order, the two originals (P) can be placed on the platen glass (3), and the replacement of the original position with respect to the platen glass (3) is eliminated. Therefore, the productivity of document feeding in the parallel copy mode is improved, and the visibility and operability of the document on the document tray (4) are improved.

The reference numerals in the parentheses above are shown for reference to the drawings and do not limit the structure of the present invention at all.

[0024]

【Example】

<Embodiment 1 of the first invention> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an image forming apparatus 13 as a copying machine.
0 and a circulation-type document feeder 110 mounted on the platen 131 are shown in vertical side view.

The image forming apparatus 130 includes an optical system 132 for scanning image information of a document placed on the platen 131.
The image forming unit 140, and a plurality of cassettes 146, 147 that store the transfer sheet S are provided. Documents fed on the platen 131 as described below are
The platen 131 is placed with its one side edge at the reference position 133 of the platen 131.

The movable mirror 135 moves to a broken line position together with a lamp (not shown) to scan the original. The reflected light from the document passes through the movable mirror 135, the plurality of fixed mirrors 136, and the lens 137, and then the photosensitive drum 141 of the image forming unit 140.
It is projected on to form a latent image. The image forming unit 140 includes a known primary charger 142, a developing device 143, a cleaning device 145, and the like.

The transfer sheet S of the selected cassette (for example, 147) is fed by the feed roller 150 and conveyed to the registration roller 143 by the conveying rollers 151, 152 and the like. The transfer sheet S fed by the registration rollers 143 at a predetermined timing is transferred by the transfer charger 15
The toner image on the photosensitive drum 141 is transferred by 5 and is conveyed to the fixing device 159 by the conveying device 157 while being separated from the photosensitive drum 141 by the separation charging device. The transfer sheet S after the toner image is fixed by the fixing device 159 is discharged onto the paper discharge tray 161 by the paper discharge roller 160.

Next, the circulation type document feeder 110 will be described for each mode. <Single-sheet copy mode> Reference numeral 105 is a document tray on which a plurality of documents P are placed, and 106 is a document partition that is placed on the uppermost surface of the sheet material P and partitions the document P discharged onto the document tray 105. The plate 106 is shown. The document tray 10
The document stack P stacked on the sheet 5 is fed from the lowermost sheet (final page) by the sheet feeding roller 107, and the separation roller 10
9. One sheet is separated by the separation section including the separation belt 111, and is guided to the registration roller pair 112.

The sheet P is abutted against the nip portion of the registration roller pair 112 to carry out registration, and then is conveyed again, and the driving roller 113 and the driven roller 115.
It is guided to the conveyor belt 116 which is wound and rotated.
While the sheet P is being pressed by the platen 131 by the conveyance belt 116, the trailing edge of the original P is at the reference position 133 (∇.
Marked).

On the upstream side of the conveying belt 116, a great circle-shaped reversing path composed of the registration roller pair 112, a reversing roller 117 and a conveying roller 119 is arranged. After the image formation by the original P, the conveyance belt 116 reverses to convey the original P by the reversing roller 117 and the conveyance roller 119, and the paper discharge roller 120 discharges the paper P onto the original tray 105 again. On the other hand, at the time of feeding the final page, the document partition plate 10
6 is moved to the uppermost position of the discharged document, and the cycle end of the document stack P is discriminated.

The image forming operation is a single-sided copy mode in which image information of one side of the document P is formed. When both sides of the document P are image-formed, the first side (front side) of the document after image formation is performed. P is reversed by the reverse rotation roller 117 and the reverse roller 117 of the conveyance belt 116, the conveyance roller 119, and the registration roller pair 112, and is placed on the platen 131 again, and the second surface (back surface) is formed on the document tray 105 after image formation. The paper is ejected. <Parallel Copy Mode> FIG. 4 shows a flowchart of the parallel copy mode. In the side-by-side copy mode, two sheets from the lower side of the document stack P are arranged side by side on the platen with their front and rear sides interchanged, and two document sheets P are image-formed on one transfer sheet S. First, the odd / even number determination unit 102 determines whether the number of originals P is odd or even. (1) When the number of originals is an even number When the number of originals is an even number, the final page (2n pages) is once fed onto the platen 131 in the same manner as in the single-sided copy mode of the single copy mode. After that, the conveyance belt 116 reverses to convey the original P to the reversing roller 117 and the conveying roller 119 side, and the leading end portion (the right end portion in FIG. 2) of the original P has a shape 113.
When it reaches the upper reference position 133 (marked by ∇ in FIG. 1), it is stopped.

Next, the 2n-1 page original P is once placed on the platen 131 in the same manner as in the single-sided copy mode. Here, both originals are placed on the platen 131 with the right end (front end) of the 2n-th page and the left end (rear end) of the 2n-1th page, that is, the adjacent edges aligned with a predetermined interval.

Next, the conveyor belt 116 and the reversing roller 1
Two originals P are simultaneously conveyed to a predetermined position on the platen 131 by 17, and the left end (rear end) of the 2n-th page is the reference position 1
Both originals are stopped as they come to 33 (see FIG. 2A). As shown in FIG. 2A, both originals P are placed on the platen 13
The image is formed by the image forming apparatus 130 in the state of being placed on the first sheet, and the image is formed on the first transfer sheet S as shown in FIG. 2B (however, the image is turned upside down). It is in a state of becoming).

Transfer sheet S after image formation by both originals
As shown in (b), the 2n-page (even-numbered page) image is on the right side of the transfer sheet S (even-numbered document corresponding position S _e ), and the 2n−1-page (odd-numbered page) image is on the transfer sheet S. An image is formed on the left side of the transfer sheet S (position S ₀ corresponding to the odd number original). Both originals after image formation are discharged onto the original tray 105 as in the single-sided mode. Thereafter, image formation is similarly performed up to the uppermost document. (2) When the number of originals is an odd number When the odd-even determination unit 102 determines that the number of originals is an odd number, the last page (2 m
(+1 page) is the same as in the single-sided copy mode.
Placed on top. Here, the main body registration roller pair 153
By starting the feeding of a 2m + 1 page document by the speed of the document size, the image forming start position on the transfer sheet S is delayed by the document size.

The control for delaying the image transfer timing on the transfer sheet S is controlled by the transfer timing delay means (not shown) in the control device 100.

FIG. 3A shows the relationship between the platen 131 and the original P placed on the platen 131, and the state of the image formed on the transfer sheet S is shown in FIG. 3B. Figure 3
In (b), when the feeding operation of the main body registration roller pair 153 is quickly started up by the size of the original, the image is on the left side of the transfer sheet S (corresponding to an odd original, as indicated by arrow A (upper transfer sheet S)). It is formed on the position S ₀ side), and image formation at an appropriate position is realized. If, when the launched body registration roller pair 153 at a normal timing, as indicated by the arrow B (lower side), the image is formed on the right side (the even document corresponding position S _e side) of the transfer sheet S, There is an inconvenient state in which a blank page is generated on the left side of the transfer sheet S.

The original of 2m + 1 pages after image formation is discharged onto the original tray 105 in the same manner as in the single-sided copy mode.
After this paper discharge, the next two originals of 2m pages and 2m + 1 pages are image-formed in the same manner as in the even-numbered parallel copy mode described above. FIG. 4 shows a flow chart of the above-mentioned parallel copying mode. In step S1 of the figure, when the number of originals is an even number, the process proceeds to each step after S6, but 2m in S6 and S7 is 2n. 2m + 1 is 2n-
1 and read them (see FIG. 2). <Embodiment 2 of the first invention> As Embodiment 2 of the present invention, the parallel copying mode (when an odd number of sheets) in the above embodiment is as follows.

The final page (2m + 1 pages) is fed onto the platen 131 by the registration roller pair 112. At the time of this feeding, the original of 2m + 1 pages is placed on the platen 131 at a distance of the original size from the reference position 133. Placed. Further, the feeding timing of the transfer sheet S by the main body registration roller pair 153 at this time is the normal timing.

As described above, the operation of placing the original P of the final page at a distance of the original size from the reference position 133 on the platen 131 is performed by the original feeding timing adjusting means (not shown) in the controller 100. Is controlled by.

FIG. 5 shows the state of the original P on the platen 131 and the state of the image on the transfer sheet S after image formation at this time. As shown in FIG. 5A, since the original P of 2m + 1 pages is placed on the platen 131 in a state of being preceded by the original size, the image formed on the transfer sheet S is
(B) As shown in the figure, it is formed at the proper position on the left side of the transfer sheet S (on the side of the odd-numbered document corresponding position S ₀ ) to prevent the occurrence of a blank page before the final page even in the parallel copying mode of odd-numbered sheets. can do. <Embodiment 1 of the Second Invention> FIG. 7 is a vertical cross-sectional side view of a circulation type document feeder (RDF) 2 according to the second invention, which is disposed on an image forming apparatus 1 which is a copying machine. Has been done.

In FIG. 7, an RDF which is a document feeder
(Circulating document feeder of the present invention) 2 has a document tray 4 on the upper side thereof, and a wide belt 7 wound around a drive roller 36 and a turn roller 37 is arranged below the document tray 4.
The wide belt 7 is in contact with the platen 3 of the copying machine main body 1, conveys the sheet original P placed on the original tray 4, and places it on the platen 3 at a predetermined position.
The sheet document P on the platen 3 is discharged onto the document tray 4.

Further, a pair of width direction regulating plates 33 are arranged on the document tray 4 so as to be slidable in the width direction of the sheet document P, and the width direction of the sheet document P placed on the document tray 4 is set. Restricting the stability of the sheet original P during feeding,
Consistency at the time of discharging onto the document tray 4 is ensured. A jogging mechanism, which will be described later, is built in the width direction regulating plate 33, and the sheet documents P discharged onto the document tray 4 are pressed one by one against the document reference guide 33 to further enhance the matching. . Further, the document tray elevating mechanism, which will be described later, allows the document tray 4 to swing about the swing center 40 between an inclined position (FIG. 7) and a horizontal position (FIG. 8).

Adjacent to the original tray 4, a half-moon shaped absorption roller 5 and a stopper 21 which is moved up and down by a stopper solenoid (not shown) are arranged, and the sheet original P is set on the original tray 4. Is restricted by the protruding stopper 21 so that it cannot move downstream.

When the copying conditions are input through the operation unit of the copying machine 1 and a start key (not shown) is pressed, the stopper 21 sinks to open the path of the sheet document P, and the sheet document P is fed. The paper roller 5 is fed and advances to the downstream portion. At this time, the partition member 22 connected to a partition member motor (not shown) built in the document reference guide 33 on the document tray rotates and rides on the uppermost sheet document P, and the unprocessed document and the processed document are processed. To distinguish.

At the downstream side of the stopper 21, there is disposed a first separating section composed of a conveying roller 38 and a separating belt 6 which constitute a separating section, and each of them is rotated in the direction of the arrow to advance from the original tray 4. The sheet originals P are separated sheet by sheet and conveyed further downstream.

A weight 20 is provided above the stopper 21, and the number of sheet originals P on the original tray 4 is small, and the sheet originals P are separated by the feeding force of the paper feed roller 5. If the sheet original P cannot be reached, the sheet solenoid P is moved downward by a weight solenoid (not shown).
The sheet feeding roller 5 is sandwiched between the sheet feeding roller 5 and the sheet feeding roller 5 to improve the feeding force of the sheet feeding roller 5.

Document feeding paths (a), (b), and (c) are formed from the separating portions 6 and 38 to the platen 3, and the document feeding paths (a), (b), and (c) are provided. ) Is bent and connected to the conveyance path on the platen 3, and guides the sheet document P onto the platen 3. In addition, in the vicinity of the paper feed roller 5, an entrance sensor 23a, which is a transmissive optical sensor for detecting the presence or absence of the sheet original P placed on the original tray 4,
23b is arranged.

On the left side of the main body of this RDF 2, there is a large roller 1
0 is provided, and the platen 3 to the large roller 10 are
Original document discharge paths (e) and (f) extending around the outer periphery of the document tray and extending above the document tray 4 are formed. Further, a document reversing path (e) for inverting the front and back of a double-sided document is formed by branching from above the large roller 10 of the document ejecting paths (e) and (f). The downstream portion of (e) joins the above-mentioned document feeding path (roll). A relay roller 44 and a paper discharge roller 11 are provided on the downstream side of the document discharge path (f).
The sheet document P conveyed in (f) is discharged onto the uppermost part of the document stack P on the document tray 4.

The wide belt 7 disposed above the platen 3 conveys and places the sheet original 4 at a predetermined position on the platen 3 and discharges it from the platen 3 after reading the image. A feeding roller 9 is provided at the confluence of the document feeding paths (a), (b), and (c) and the document reversing path (e). A loop is formed on P to prevent the sheet original P from skewing. In the vicinity of the upstream side of the feeding roller 9, the sheet feeding sensor 2 which is a transmissive optical sensor for detecting the front end and the rear end of the sheet document P.
5a and 25b are provided, and the document feeding path (a),
It is possible to detect the sheet document P that has passed through any of the conveyance paths of (b), (c) and the document reversing path (e).

Further, downstream of the feeding roller 9, registration sensors 39a and 39b, which are transmissive optical sensors for detecting the trailing edge of the sheet original P, are provided. Below the large rollers 10 in the document discharge paths (e) and (f), reversing sensors 26a and 26b, which are transmissive optical sensors for detecting the sheet document P carried out from the platen 3, are arranged. Further, in the document discharge path (f) between the large roller 10 and the discharge roller 11, the passage of the sheet document P that passes through the document discharge path (f) and is discharged onto the document tray 4 is detected. Paper discharge sensors 27a and 27b, which are transmissive optical sensors, are provided.

A reversing flapper 34 for switching the path is provided at a portion branched from the document discharge paths (e) and (f) to the document reversing path (e), and the reversing flapper solenoid is turned on. When turned off, the path is switched by swinging between the solid line position and the chain line position in the figure.

Further, on the right side of the main body of the RDF 2, there is provided a second document separating means for conveying the sheet document from the right end of the platen glass to the image reading portion on the platen 3, a second document feeding path (h), ( Re) and (nu) are configured.

The document tray 4 is configured to swing with the positions shown in FIGS. 7 and 8 as the upper limit and the lower limit in conjunction with the vertical swinging operation of the document tray 4 which will be described later. As shown in FIG. 8, when the document tray 4 is at the lower limit position, the half-moon shaped second paper feed roller 8 and the conveyance roller 15 and the separation belt 14 which form the second separation unit are arranged adjacent to the lower limit position. Document trays 4 are installed by rotating in the direction of the arrows.
The sheet originals P that have advanced from the above are separated sheet by sheet and conveyed further downstream.

The document tray 4 has an upper limit position or a lower limit position depending on the size of a document placed on the tray and input conditions of the image forming apparatus. When the tray 4 reaches the lower limit position, the above-mentioned stopper 21 of the tray 4 conveys the sheet originals P placed on the tray 4 in a bundle for a certain distance to the second separating means 14 and 15 side. Tray 4
The stopper slide base 41 moves through the link 42 in the guide provided in the roller 46 by the rotation of the eccentric cam 43.
To move through. Eccentric cam 43 centered on the support shaft 57
Has a flag 5 to detect the home position
3 and a transmissive sensor 45 are provided.

When the original tray 4 reaches the lower limit position,
The sheet original stopper 19 is swung upward by the original stopper solenoid about the support shaft 31, and receives the sheet originals P conveyed by the bundle conveying means. The sheet originals P conveyed in a bundle are always arranged near the upstream side of the second separating means to detect the presence or absence of the sheet originals 28.
At a and 28b, the paper is conveyed to a position where the presence of paper is detected. When the bundle conveyance is completed, the sheet document stopper 19 is placed on the sheet document P.

The second separating means 14 and 15 are provided with a second
Of the sheet feeding roller 16 is provided, and the second feeding roller 16 forms a loop on the arrived sheet original P,
The skew feeding of the sheet document P is prevented. In the vicinity of the upstream of the second feeding roller 16, the second paper feed sensor 3 which is a transmissive optical sensor for detecting the front end and the rear end of the sheet original P.
0a and 30b are provided. Further, there is a relay roller 17 on the downstream side, and a transmissive optical sensor 18a for detecting the leading end position of the sheet document P is provided in the second feeding path (nu).
1b is provided. The image sensor 18a, 18b
Thus, timing control of the sheet material on which an image is formed in the image forming apparatus is performed.

When the lowermost sheet is conveyed to the separating section by the rotation of the second conveying roller 15, 1. When the number of image forming copies is set to 1 in the image forming apparatus 1 with the input key;
The sheet original, which remains on the upper side and is discharged by the discharge roller 11, is regulated so as not to enter the second separating unit.

2. When the number of image forming copies is set to n copies by the input key in the image forming apparatus 1 (when one copy of the sheet original is n circulations); the sheet original stopper 19 moves upward until the sheet original is circulated (n-1). When the first sheet document of the n-th circulation is reloaded on the document tray 4, the sheet document stopper 19 is placed on the sheet document, and the first sheet document is placed on the second separating unit. Regulate entry. At the end of the n circulation, the leading edge of the sheet document P is regulated by the sheet document stopper 19. afterwards,
The document tray 4 moves upward and stops at the upper limit position.

Next, the parallel copy mode of the circulation type document feeder will be described.

At the time of parallel copying, the originals P are stacked face up on the original tray 4, and the parallel copying mode is set by a mode input key (not shown) or the like of the image forming apparatus 1 to start copying of the image forming apparatus 1. When is turned on, the document tray 4 rotates clockwise around the swing shaft 40 to the position shown in FIG. 8, and the document P is stopped by the stopper 21 on the document tray 4 to the second separating means 14, 15. The bundle is conveyed to the side (FIG. 9).

After the original document P is conveyed in a bundle, it is separated one by one from the bottom paper by the second separating means 14 and 15,
The second feeding roller 1 to the side of the second feeding path (H, L, N)
6, it is conveyed via the conveyance roller 17. Figure 10,
As shown in FIG. 11, the manuscript m (the m-th page) is shown in FIG.
As shown in 0 (a), the sheet is conveyed after the leading end is abutted against the second feeding roller 16 to perform skew correction.

When the trailing edge of the document P passes through the sensor 30, the drive control of the second feeding roller 16 is performed so that the trailing edge of the document m is located immediately after the nip of the second feeding roller 16. This is performed by the control device 90 (FIG. 10 (b)).

Next, the original (m-1) is separated by the second separating means 14 and 15, and the leading end of the original (m-1) abuts on the second feeding roller 16 after passing through the sensor 30. Then, the skew feeding correction is performed here (FIG. 10C).

Next, the second separating means 14 and 15, the second feeding roller 16 and the conveying roller 17 are connected to a drive source by a clutch (not shown), start to rotate at the same peripheral speed, and the originals m, (M-1) is simultaneously conveyed. Manuscript m, (m-
1) is conveyed from the other end side 3B of the platen glass 3 via the wide belt 7 and the original m is placed on the left side in the drawing.
Two originals m and (m-1) are arranged side by side on the platen glass 3 with 1) on the right side (FIG. 11E).

Thereafter, the reading section 1A of the image forming apparatus 1
Moves from one end side 3A of the platen glass 3 to the other end side 3B, reads two images, and a copy sheet S as shown in FIG. 13 is created. After the image reading is completed, the two originals m and (m-1) are continuously ejected from the original ejection path (e, f).
Then, the sheet is discharged onto the document tray 4 by the discharge roller 11 via. The parallel copying mode can be implemented by repeating the above operation a required number of times.

The interval (inter-page distance) between the trailing edge of the document m and the leading edge of the document (m-1) is adjusted by arbitrarily setting the stop position of the document m after passing through the sensor 30. It is possible.

Further, in the present embodiment, the second feeding roller 1
Although the inter-page distance is adjusted in 6 sets, any roller (for example, the conveyance roller 17) can be used depending on the driving method of each roller, the sensor arrangement method, and the like.

As described above, when the parallel copy mode is set, it is possible to perform high-speed document replacement with the document-face-up type circulatory document feeder, and copy pages are out of order. Can be efficiently provided to the user.

[0070]

【The invention's effect】

<Effect of First Invention> According to the present invention, in the parallel copying mode in which image information of two originals is image-formed on one transfer sheet, the final page when the original bundle is an odd number of sheets is the transfer sheet. By controlling so that the image is formed at the odd-numbered original corresponding position (left side), it is possible to realize the parallel copy mode without forming a blank page in the continuous pages of the transfer sheet after the image formation. <Effect of Second Invention> According to the present invention, in the circulation type document feeder in which the document is placed face up,
When the parallel copy mode is set, the originals are fed from the second feeding path side through the second separating means, and the two originals are sequentially conveyed from the other end side of the platen glass onto the platen glass. -Since the image is formed by placing it on the plate, the operation of exchanging the document position for placing the document unlike the conventional device is eliminated, and the parallel copy mode can be performed at high speed, thus realizing high productivity. be able to. Further, since the originals can be face-up and the parallel copy mode can be performed, the visibility of the originals is good for the user and the operability of the apparatus can be improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an image forming apparatus showing an embodiment of a first invention.

FIG. 2A is a plan view showing the state of the original and the platen when the original bundle in the parallel copy mode is an even number;
The figure is a plan view showing the image state of the transfer sheet.

3A is a plan view showing a state of an original and a platen when an original stack has an odd number of originals in a parallel copy mode; FIG.
The figure is a plan view showing the image state of the transfer sheet.

FIG. 4 is a flowchart of an image forming operation in the parallel copy mode.

FIG. 5 is a plan view showing a state of a document and a platen, and a state of a transfer sheet S and an image according to the second embodiment of the first invention.

FIG. 6 is a flowchart of an image forming operation in the parallel copy mode.

FIG. 7 is a vertical cross-sectional side view of a ring type document feeder according to an embodiment of the image forming apparatus of the second invention.

FIG. 8 is an operation diagram of a document tray and documents in the parallel copy mode.

FIG. 9 is an operation diagram of a document tray and documents in the parallel copy mode.

[FIG. 10] Similarly, a sheet feeding operation diagram

[Fig. 11] Similarly, a sheet feeding operation diagram

FIG. 12 is a vertical sectional side view showing a first example of a conventional document feeder.

FIG. 13 is a plan view of an original arrangement on the platen glass and copy paper.

FIG. 14 is a vertical sectional side view showing a second example of a conventional document feeder.

FIG. 15 is a plan view of an original arrangement on the platen glass and copy paper.

FIG. 16 is a vertical sectional side view showing a third example of a conventional document feeder.

FIG. 17 is a plan view of an original arrangement on the platen glass and copy paper.

[Explanation of symbols]

P original (sheet original) S transfer sheet (copy paper) (a, b) first feeding path (h, re, n) second feeding path (e, f) original discharging path 1 image forming apparatus 1A Image reading unit 2 Circular document feeder 3 Platen glass 3A One side of platen glass 3B Other side of platen glass 4 Document tray 6,38 First separating means 14,15 Second separating means S ₀ Odd document corresponding position S _e Even original corresponding position 100 Control device 101 Parallel copying means 102 Odd-even determination means 110 Automatic original feeding device 130 Image forming device 131 Platen glass

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohito Nakagawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (4)

[Claims] 1. A parallel type copy unit for feeding a plurality of originals to the platen of the image forming apparatus by a circulating type original conveying apparatus, two sheets from the lower side and changing the front and rear of the originals. 1 of the two originals placed
In an image forming apparatus that forms an image on a transfer sheet, an odd-even determination unit that determines whether the number of original bundles is an odd number or an even number, and if the original bundle is an odd number, the last page of the original bundle is An image forming apparatus comprising: a control unit that controls an image to be formed at a position corresponding to an odd number original on the transfer sheet. 2. The transfer timing delay means, wherein the control means delays the transfer sheet corresponding to the last page of the original stack by an amount corresponding to the length of one original and feeds the transfer sheet to the image forming section. The image forming apparatus according to claim 1. 3. The control means sets the final page of the original stack by an amount corresponding to the length of one original from the reference lines on the tip side of the two originals placed on the platen. The image forming apparatus according to claim 1, wherein the image forming apparatus is a document feeding timing adjusting unit that is placed separately. 4. An original placing table on which an original to be image-processed is placed, first separating means for sequentially feeding one by one from the bottom of the original, and an original separated by the first separating means. Platen glass for reading images of
A first feeding path for guiding the separated document from one end of the platen glass to an image reading unit; and a document feeding the document from the image reading unit for guiding the document to the document table. 1. A document discharge path for feeding a document to the side opposite to the feeding path 1 and a document on the document placing table located on the opposite side of the first separating means via the document placing table from the bottom. A second separating means for sequentially feeding one by one,
And a second feeding path for guiding the separated document from the other end side of the platen glass to the image reading section, wherein the image reading section has one end side of the platen glass. In the image forming apparatus for moving the image from the other side to the other side, when the image forming apparatus is set to the parallel reading mode,
The document of the circulating document feeder is separated by the second separating means and is conveyed from the other end side to the one end side of the platen glass through the second feeding path to be arranged on the platen glass in parallel. An image forming apparatus having a control means mounted on the image forming apparatus.