JPS6061767A - Both face image forming device - Google Patents

Abstract

PURPOSE:To reduce the number of times of inversion of an original by making a copying which becomes the first surface, continuously by a necessary copy number portion, and containing and loading it on an intermediate tray. CONSTITUTION:For instance, five sheets of originals are fed to an original platen glass 3, copying is executed from an odd page, an operation for returning the original to an original placing plate 32 is repeated without inverting it, and after a smaller copy number by one copy than a necessary copy number is completed, an operation for inverting and returning the original to an original placing plate 32 after the copying is ended is executed. Next, when the original is fed out, an even page surface of the original is set so as to be opposed to the glass surface on the original platen glass 3, copying of the odd page is executed to the first surface, and copying of an even page is executed to the second surface side of a form P' contained and loaded on an intermediate tray 20. In this case, the original is returned without being inverted first, but a form P'' to which copying of the second surface is ended, namely, the both face copy is inverted by an inverting device 25, and thereafter, discharged to a filting machine 50 side. By executing this operation, the copy P'' is made on a tray 52 of the filing machine 50, and thereafter, a both face copying of a necessary copy number portion is made by executing repeatedly the same copying cycle.

Description

[Detailed description of the invention] The present invention relates to an image forming apparatus.

More specifically, the present invention relates to an image forming apparatus (double-sided image forming apparatus) having a function of creating a double-sided image formed object using a double-sided document having images on both the front and back sides as an original.

A double-sided copying machine will be explained below as an example. FIG. 1 shows a very schematic configuration of an example of a copying machine having a double-sided copying function. The double-sided copying machine of this example has a) a copying machine main body Ia1 with built-in copying process equipment, and b) a system that automatically feeds and ejects original sheets (original sheets) one by one onto the original platen glass 3 of the copying machine main unit 1. When making one or more copies of a set of multiple C1 copies, the circulation-type automatic document feeder 3.0 (hereinafter referred to as RDF device) that feeds an automatic paper binding machine (automatic bookbinding device) 50 that operates every time one set of copies is discharged and piled up on a paper output tray 52, and performs batch binding of one set of deposited copies by stapling or the like; This is an automatic processing system including document feeding, copying, and water production, consisting of a combination of 3 mechanisms, 30, and 50.

a. This copying machine 1 The copying machine 1 of this example is a transfer type electronic copying machine that follows the so-called Carlson process, and 2 is an exterior case of the copying machine, and 3 is an opening formed on the top plate surface of the exterior casing. 4 is a drum-shaped photoreceptor that is driven to rotate in the counterclockwise direction indicated by the arrow around an axis 5; 6 is a charger that charges the surface of the photoreceptor; 7 is an optical system moving type; The document scanning exposure mechanism consists of a document illumination light source, a fist mirror e imaging lens, etc., and illuminates the downward facing image surface of the document set on the document table glass 3.
The document surface is optically scanned from one end side to the other end side, and an image of the document image is formed and exposed on the surface of the photoreceptor 4 which has been charged by the charger 6.

8 is a developing device that visualizes the electrostatic latent image formed on the surface of the photoreceptor 4 by the above-mentioned charging and exposure as a toner image, 9 is a transfer charger, and 10 is a paper feeding mechanism. Paper feeding mechanism 10 of this example
is a dual type having two paper storage sections II and 12, a first and a second paper storage section, each of which stores different types of paper of different sizes and paper qualities, and which can be specified by operating a selection switch. Paper P is fed from the first or second paper storage section to the transfer section 9 in synchronization with the rotation of the photoreceptor 4. That is, when the first paper storage section 11 is specified, the paper in that storage section is fed to the transfer section between the photoreceptor 4 and the transfer charger 9 through the path of the sheet number 13 → sheet number 14 → sheet number 15. The toner image on the photoreceptor surface is transferred onto the paper surface. When the second paper storage section 12 is designated, the paper in the second paper storage section 12 is fed to the transfer section 9 along the single-sheet sheet path 16→single sheet path 15.

14 is a fixing device, and the paper that has passed through the transfer section 9 is then separated from the surface of the photoreceptor 4 and introduced into this fixing device by a conveying device 18, where the image is fixed. Reference numeral 19 denotes a photoconductor cleaner that removes transferred residual toner from the photoconductor surface after paper separation.

Reference numeral 20 denotes an intermediate tray that temporarily receives the paper that has been copied on one side when copying is performed in double-sided copying mode, and 21 denotes a fixing device 1.
This is a paper path deflection plate disposed on the paper exit side of No. 4.

The paper path deflecting plate 21 is selectively controlled to swing around a shaft 22 between a first attitude shown by a solid line and a second attitude 21 shown by a two-dot chain line.

This deflection plate 21 is held in the second posture 21 when copying is performed in the single-sided copy mode, and the paper that has been copied on one side (single-sided copy) with the fuser 14 also comes out is placed on the top side of the deflection plate 21. The paper output tray 52 of the automatic paper binding machine 50 is introduced into the paper discharge passage 23 leading to the paper discharge port 24 through the paper discharge port 24 .
Expelled inward.

When copying is performed in the double-sided copy mode, the deflecting plate 21 is held in the first position, and the paper that has been copied on one side after coming out of the fixing device 14 passes through the lower surface of the deflecting plate 21 and is transferred to the Φ inter-tray. It is temporarily discharged to 20. Then, the paper that has been copied on one side once ejected to the intermediate tray 20 is transferred from the intermediate tray 20 to the sheet path 17→14 in the copying cycle on the other side.
→The paper is again fed to the transfer unit 9 through the same route 15, and the image is transferred to the other side of the paper. Next, the paper is separated from the four sides of the photoreceptor and introduced into the fixing device 14, where the transferred image on the other side is fixed, and the paper is output from the fixing device 14 as double-sided copy processed paper (double-sided copy). This double-sided copy then passes through the upper surface side of the deflecting plate 21 which has been changed to the second attitude 21 by the time the double-sided copy comes out of the fixing unit 14, enters the paper discharge path 23, and enters the paper discharge path 23 from the paper discharge port 24 into the automatic paper binding machine 50. The paper is discharged into the paper discharge tray 52 of.

b. RDF device 30 The RDF device 30 of this example includes a document loading table 32 and a single document feed mechanism 33 in an exterior housing 31 that can be freely raised and lowered with respect to the document table glass 3 of the copying machine main unit l. , an endless rotating belt (full-surface belt) for feeding originals, and a sheet path mechanism 35 for returning originals.

When the exterior housing 31, that is, the RDF device 3o is tilted down against the original glass plate 3, the lower surface of the entire belt 34 is in moderate pressure contact with the entire upper surface of the original glass plate 3 in a state #1. Original 0 is loaded on the original stacking table 32 (original 1
(Sometimes it's only one sheet.)

In response to the copy start signal, the original on the original stacking table 32 (in this example, the lowest original) is separated by the mechanism 33 into a sheet path 35, and guided to the left side of the original glass 3. uJ between the document table glass 3 and the full-surface belt 34, which is being rotated counterclockwise as indicated by the arrow at this point.
At J, the upward surface on the table 32 becomes the downward surface, and the document table is slid and conveyed on the glass 3 toward the right side of the glass by the rotation of the belt 34. When the leading edge of the document reaches the reference line position near the right side of the glass, the rotational drive of the belt 34 is temporarily stopped. As a result, one original is automatically fed to a predetermined position on the original platen glass 3 and placed in a set state. When the full-surface belt 34 stops, the copying machine 1 then starts copying the downward image side of the original set on the original platen glass 3.

When the exposure of the set original is completed on the side of the copying machine 1, the full-surface belt 34 starts rotating again, and the exposed original is transferred to the sheet path 36 of the original return sheet path mechanism 35.
Transported and introduced to. On the other hand, the next document is started to be separated and fed one by one from the document stacking table 32, and is conveyed onto the document table glass 3 by the rotating full-surface belt 34 in place of the previous exposed document.

In the mechanism 35, reference numeral 37 denotes a passage deflection plate, which is selectively controlled to be switched to a first attitude shown by a solid line or a second attitude 37 shown by a two-dot chain line around an axis 38. When in the first position, the exposed original that has been conveyed and introduced from the document table glass 3 side to the sheet path 36 is introduced to the switch pack sheet path 39 side, which is a reversing section, and its rear edge is completely brought to the sheet path 39 side. Once entered, the document is transported by the switch pack and returned to the document stacking table 32 along the path of the sheet path 40 + discharge roller 41 with the downward image surface on the document table glass 3 also facing downward. Also, passage deflection plate 3
7 is in the ttS2t position 37', the exposed original introduced into the sheet path 35 is transferred to the original stacking table 32 via the path of the sheet path 42 → discharge roller pair 41, with the downward image surface on the original platen glass 3 facing upward. It will be returned.

Note that if the original is a real original, or if the original is manually set on the original glass plate 3, the RDF device 30 is opened and raised from the original glass plate 3 and the original is copied onto the original glass plate 3. Place it in storage with the image side facing down, then press R
The DF device 30 is folded over as a document pressure bonding plate.

C1 Automatic paper binding machine 50 The automatic paper binding machine of this example has a paper output tray 52 in the exterior housing 51 that receives copies from the copier main unit L side.
, Stella pull driving mechanism 53. It has a built-in stunker 54, etc., and is arranged in series with a copy receiving port aligned with the paper discharge port 24 side of the copying machine 1.

The copies ejected one after another from the main side of the copying machine to the output tray 52 are stacked in the tray 52 in a state in which two corresponding right-angled sides coincide with each other and overlap (aligned state). go. Then, when the last sheet of a set of multiple copies is discharged onto the tray 52 and aligned, the stellar pull mechanism 53 is activated to collectively bind the set of stacked copies. do. The bound copies are automatically discharged into the stacker 54 by tilting the tray 52 or the like.

By the way, in the mode of creating multiple double-sided copies using a set of double-sided originals as the original, the following first method or second method is generally used for the copying order of the originals and the manner in which the originals are circulated. There is.

The first method is to make double-sided copies one by one for each set of double-sided originals. To give a specific example, to perform double-sided copying from a set of 5 sheets of double-sided image formation (10 pages of original), first the 5th sheet of the original is sent from the document stacking table to the document glass, and then the first side of the paper is printed. Copy the 10th page,
Next, the original is reversed and re-fed to the original platen glass, and the 9th page is copied onto the second side of the paper on which the lθ page has been copied on the first side, thereby creating the 5th original. Double-sided copying is performed, and the original is reversed and returned to the original loading table. Thereafter, the same double-sided copying cycle as described above is repeated for each of the fourth to first originals, thereby obtaining a set of double-sided copies of the same five originals. When creating multiple copies, repeat the above-mentioned 8-body cycle as many times as necessary.

However, this method completes double-sided copying of each double-sided original one sheet at a time, and while it is effective when the number of sheet passes is small, it takes time to copy when the number of pages increases. Become. In addition, in the example described above, the number of times the original is reversed is at least ZnXm times when making m copies of double-sided copies from n sheets of double-sided originals. However, if a paper reversing device is installed on the copying machine side, half of the above nXm is required.
It is also possible to do this twice, but this method will not be described here because it is not directly related to the present invention. In any case, this first method has the disadvantage of slow copying speed, and there is a high possibility that the original will be damaged because the original is reversed many times. It is essential that the equipment be fully equipped, leading to larger and more complex machines.

2nd method This is for a set of double-sided originals. First, even-numbered pages (or odd-numbered pages) of each original are successively copied, each even-numbered page copy is stored in the intermediate tray, and then the odd-numbered pages of each original are copied as above. Double-sided copying is performed by sequentially copying even-numbered pages onto the other side of the corresponding copies. To describe the above example specifically, first, the fifth original is sent from the original stacking table to the A-mounting glass, the 10th page is copied, and the original is reversed and returned to the original stacking table. Next, the fourth original is sent out and the eighth page is copied. Pages 6, 4, and 2 of the 3rd to 1st originals are sequentially copied, and all even-numbered pages are stored and stacked in the intermediate tray, and each original is reversed and placed on the original stacking tray. Return to Next, send the 5th original stored upside down to the original platen glass, copy the 9th page onto the 2nd side of the paper with the 10th page copied on the 1st side, and copy this original. Flip it over and return it to the document stacking table. Thereafter, similarly, pages 7-5, 3, and 1 are sequentially copied onto the second side of the corresponding copy on which the even-numbered pages have already been copied. As a result, one set of double-sided copies is completed using the same five sheets as the original.

In this method, all originals are reversed and returned, so the originals that have been circulated once are placed on the original stacking table in the same page order as the original and returned. If multiple copies are required, the entire cycle described above is repeated.

FIG. 2 is a schematic flowchart showing the relative flow of originals and sheets when double-sided copying is performed using the second method described above with respect to the copying apparatus shown in FIG. Originals 01 to 01 are placed on the original stacking table 32 in page order with the youngest pages on top as shown in Figure 3 (A).
It is placed on. First, the stacked documents are successively sent one by one from the lowest one 05 to the loading table glass 3.
The loading table conveys the original past the lath 3 without exposing it to light, introduces it into the original return sheet bus mechanism 35, and reverses it along the path of sheet path 36 + switchback sheet path 39 → sheet bus 40 - paper ejection roller pair 41. and return it to the loading platform 32 again.

If this operation is repeated until the originals have passed through one cycle, the originals 01 to 0.
becomes the page order state shown in FIG. 3(b). Next, when the originals in this page order are sent out from the lowest one to the document table glass 3, the tenth page (an even numbered page), which is the final page f, is set facing the document glass glass 3. Copying of the 10 pages is executed, and the copied paper (copied paper on one side) is stored in the intermediate tray 20. After the exposure is completed, the original is reversed and returned to the original stacking table 32. If you repeat this operation once for each manuscript, Φ
In the intermediate tray 2θ, five single-sided copies P of only even-numbered pages are stacked and stored in the page order shown in FIG. 4(A).

The originals are placed on the original loading table 3 in the page order shown in Figure 3 (a).
2 I'm back on top. Next, when the documents in the page order are sent to the document glass 3 starting from the lowest one, the ninth page, which is the last page of the odd-numbered pages, will be set facing the document glass 3.

Ru. The image of the ninth page is copied onto the second side of the lowest sheet sent out from the intermediate tray 20, that is, the sheet on which the tenth page has been copied. Then, the copy paper (page 10 and double-sided copy of page 9) is discharged to the binding fi 50 side. When this operation is repeated until the document goes through one cycle (until the paper P in the intermediate tray runs out), the automatic binding machine 5
As shown in FIG. 4(b), a set of double-sided copies P of the same size as the original are arranged in page order with the youngest page on top, and are stacked on the tray 52 of No. 0, as shown in FIG. . The originals have returned to the original stacking table 32 in the page order shown in FIG. 3(b). The automatic binding machine 50 stores some double-sided copies P on the tray 52.
When the copies are accumulated, the staple stitching mechanism 53 is actuated to staple a portion of the copies all at once. The bound bundle of sheets is then discharged into stacker 54.

By repeating the above operations for the required number of copies, the required number of double-sided copies are completed.

Although it is possible to increase the copying speed using the second method compared to the first method described above, the number of times the document is reversed is limited to the number of times the document is reversed. When making double-sided copies, at least ZnXm times are required.

When the first copy of the final copy is completed, the original on the original loading table 32 is in the state shown in Fig. 3 (b), so the original is sent out again and reversed, and the first page is placed in the order shown in Fig. 3 (a). Requires action to return to state. However, if it is to be returned after the exposure of the odd-numbered pages is completed in the last time, and if it is to be returned without reversing, it is possible to omit only this final reversing operation.

In addition, if a sheet reversing device is provided, it is possible to use half the number of nX times as described above.

However, in any case, even with this second method, the document is reversed many times, which increases the possibility of causing a document jam or damaging the document. It is essential to have a device attached, which imitates the increasing size and complexity of machines.

Note that both the first method and the second method described above are just examples, and the page order (younger pages first, larger pages first, even numbered pages first, odd numbered pages first) and the original can be reversed. The positions where this is done are not limited to the above example, and various positions are known.

The present invention has been developed and proposed in view of the above, and in a mode in which multiple double-sided copies are created using a set of double-sided originals as an original, the copying order of the originals and the W-document circulation mode are adjusted as described above. A rational third method/aspect different from the first and second methods, that is, by sequentially making the necessary number of copies for the first side and storing and stacking them on an intermediate tray, the original can be reversed and the number of times can be increased. Therefore, the possibility of damaging the original can be reduced. In addition, since the number of times the original is reversed is small, the operator can easily create a double-sided copy from a double-sided original even if the automatic circulation document feeder is not equipped with a document reversing device. It is an object of the present invention to provide a double-sided image forming apparatus.

FIG. 5 is a schematic flowchart showing the flow of manuscripts and paper according to the present invention. First, similar to the example in Figure 2 (second method),
The originals 01 to 05 stacked on the original stacking table 32 in the page shape shown in FIG. The document is conveyed through the document return sheet path mechanism 35, and is then reversed and returned to the document loading table 328. This operation is repeated until the original goes through one cycle. As a result, the original becomes in the page order state shown in FIG. 3 (b). Next, when the originals in the page order are sent to the original platen glass 3 starting from the lowest one, the last page, the 10th page (an even numbered page), is set facing the original platen glass 3. This 10th page is copied and the copied paper is stored in the intermediate tray 20. After the exposure of the 10th page is completed, the original is returned to the original stacking table 32 without being reversed. After this operation (copying of even-numbered pages of the original) is performed sequentially for each original until one cycle is completed, even-numbered pages are copied in the page order state shown in FIG. l Paper P is stored. Thereafter, the returned originals on the original ffi stacking table 32 are continued to be sent out one by one starting from the lowest one, and the copies are stored in the intermediate tray 20. Continuously continue until a small number of copies are made.Then copy size 21 of the last copy.
When No. 9 is entered, the exposed originals are each reversed and returned onto the original stacking table 32.

When the copying cycle of the last even-numbered page is completed successfully, the original is returned to the original stacking table 32 in the page order state shown in FIG. 3(A).

Also, there is one (^) in the intermediate tray 20 as shown in Fig. 4()X).
A predetermined number of copies P1 for which only a few pages have been copied
・P2 and P3 (the figure shows three sets) of paper are loaded.

After copying the required number of even-numbered pages of each of the originals, the originals returned to the original stacking table 32 in the page order shown in FIG. When the sheets are fed out one by one starting from the lowest one, the odd-numbered pages of each document will be conveyed and set with the surface facing the document table glass 3. Therefore, the document transport is set in this manner, and the even-numbered pages on the intermediate tray 20 are sequentially sent to the transfer unit 9 from the lowest page to perform copying, and the copied paper (double-sided copy) are sequentially discharged onto the tray 52 of the binding machine 50. When this operation is repeated until the original goes through one cycle, a double-sided copy P, which is the same as the original, is completed on the automatic binding 4'150 tray 52 in the page order shown in Figure 4 (b). Then, some of the double-sided copies are stippled all at once by the operation of the stapler mechanism 53, and then discharged into the stacker 54 and placed on the tray 5.
2, the next paper receptacle will be ready to accept. The exposed original is returned to the original sheet path 36 of the sheet path mechanism 35 → same 4
The document is returned to the document stacking table 32 without being reversed through route 2.

As a result, the original is placed on the table 3 in the page order shown in Figure 3 (a).
Return to

By continuing the above operations a required number of times, the required number of 1 m copies is completed. Further, the originals are finally returned on the original stacking table 32 in the page order state shown in FIG. 3(A), that is, in the page order state as set at the beginning.

As described above, according to the present invention, the number of times the original is reversed is only two times (
2×n times), which makes it possible to reduce the risk of damaging the original. Also, swap the front and back sides of the manuscript like this 1
Automatic circulation F1 without a reversing device because there are fewer losses. Even a document feeder can handle double-sided documents without much effort on the part of the user.

FIG. 6 shows the configuration of the φ-interval tray 20 that makes the present invention possible.

In the case of double-sided copying by the conventional method, the sheet on which copying has been completed on one side is only stored in one copy P (FIG. 4(a)) in the intermediate tray and is not stacked. In this case, if the means for detecting paper in the intermediate tray detects only the presence or absence of paper, it is possible to detect troubles such as double feeding of documents or paper. That is, double feeding of originals or sheets of paper can be detected by looking at the correspondence between one circulation of originals and the presence/absence of paper. This state can be easily handled by, for example, a photoelectric sensor, a micro switch, etc., as indicated by the dotted line in the flowchart of FIG.

However, in the case of the method of the present invention, the required number of copies is P,・P2′・
p, /... (FIG. 4 (a)) The paper that has been copied on one side is stored in the intermediate tray 20, so
It is necessary to detect the force (l/) of each sheet of paper facing one cycle of the original. This state is shown by the dotted line in FIG. This is because, for example, if a double feed of paper occurs in the paper feed unit 11 or 12 during the one-sided copying execution cycle, and the double feed is separated during second-side copying, the subsequent page order will change. That's what happens. In each section on the intermediate tray 20, if the sheets P1, P, P3', etc. for the first circulation of high paper can be detected strongly, only the portion containing the above-mentioned double-fed sheets is defective. However, from then on, it will work properly (M (@). For example, if you double feed on the first side, there will be one extra sheet of paper for each circulation of the original, so this is a long process. One possible method is to simply feed the paper and return to the next copying operation.In order to make the present invention user-friendly in this way,
It is necessary to provide the intermediate tray 20 with a means for detecting the diagonal a of the paper between each sheet group (1) where each part has been copied on one side.

As a means of detecting this diagonal pattern a, a method can be considered in which a cutting member is placed on the diagonal pattern a of each sheet group l/Pl, Pl, P3, etc., and this method is shown in the flowchart of Figs. 2 and 5. It can also be used as a method for detecting the circulation of a document. That is, as shown in FIG.
When a group of sheets P is piled up, the separating member 60 is placed on the topmost sheet of the sheet group P. Then, the sheets constituting the next copy are stacked on this separating member 60. The sheets on the intermediate tray are fed one by one to the transfer unit 9 starting from the lowest one, and when the separating member 60 reaches the lowest position, the separating member 60 is moved by its own weight because the paper it was supporting until then is gone. fall downwards. If a means for detecting this fall is provided, it is possible to detect the diagonal a of the paper. This partition member 60
By having a plurality of sheets, it is possible to detect the diagonal a of a plurality of sheets.

In FIG. 6, 51-62 is a sheet separation/feeding roller mechanism, which includes an upper roller group 61 and a lower roller group 62.
are arranged so as to slightly overlap in the radial direction, and the upper and lower roller groups 61 and 62 are each driven to rotate in the direction of the arrow. These roller mechanisms 61 and 62 feed out the sheets on the intermediate tray 20 one by one starting from the lowest one. 63 is a guide for the leading edge of the paper, and 64 is for regulating the side edges of the paper. Note that the front side plate is not shown in the figure.

FIG. 7 shows a state in which diagonal marks a of a large number of paper groups are detected by using a plurality of dividing members.
In the illustrated example, three sets of paper groups P1, Pl, and P3 are separated by the separating member 60. 602 and 603, and are stacked on the intermediate tray 2.0. FIG. 8 shows the plurality of partition members 601 and 60211603.
Motors 65.・562・653
. . and sensors (photoelectric sensors) 661, 662, 663, . . . that detect the position of the diaphragm member are shown.

At the point when the last sheet of the first set of sheets P1 is discharged onto the intermediate 5 tray 20, and it has finished aligning and overlapping the top sheet of the sheets piled up on the tray 20 so far, The signal transmitted (sent from the control circuit after the copy number counting circuit counts the end of copying the last sheet) energizes the first motor 65 □ and moves the first partition member 60 □ in the direction of the arrow. The sheet is rotated to a state where it rests on the uppermost sheet surface of the first sheet group P'1. Subsequently, the next second set of sheets P2 is ejected and deposited on top of it, and when the last sheet of the second set is ejected and deposited, the second motor 6
52 is energized, the second barrier member 602 is rotated and placed on the uppermost sheet surface of the second set of sheets P2. In this way, each time a group of sheets of each section is discharged and deposited on the intermediate tray 2θ, the closing member rotates and moves to ride on the uppermost sheet surface of the sheet, whereby the group of sheets of each section P, Pl... A partition member is interposed between each diagonal opening a to form a partition.

Each partition member 60.・602... are all in a state of hanging downward as shown by the solid line in FIG. 8 in a free state, and each of the photoelectric sensors 661, 662...
optical path is blocked. When the individual partition members are sequentially rotated to partition the paper group 'PL''p2..., the optical path of the corresponding photoelectric sensor 66 is opened by the escape caused by the rotation of the partition member.

Then, the feeding of the sheets on the intermediate tray 20 starts from the lowest one, and each time the feeding of one group of sheets is completed, the unsupported partition member hangs downward due to its own weight, and the optical path of the corresponding sensor is changed. Be cut off. As a result, it is detected that the feeding of each group of sheets has been completed.

FIG. 9 shows the portion for rotating each of the diaphragms 60. Between the shaft 67 of the motor 65 and the diaphragm 60 there is a means 68 for transmitting rotation in one direction, and this unidirectional rotation means 68 It also does not transmit more torque than the chamber. The shaft 67 is rotated by the motor 65 in the direction of the arrow. At this time, the driving force is transmitted to the separating member 60 by the one-way rotating means 68, and the separating member 60 rotates in the direction of the arrow and is placed on top of the paper and received IL. Thereafter, even if the means 68 slips with respect to the one-way rotating shaft 67 and the motor 65 rotates, the diaphragm member 60 is stopped by the paper surface.The motor 65 stops after rotating for a certain period of time.

When one group of sheets is sent out from the intermediate tray 20 and the last sheet of the group of sheets is sent out, the closing member 60 loses its support and rotates in the direction of the arrow by its own weight. At this time, the one-way rotation means 68 acts in a direction that does not transmit rotation to the support 67, so the restriction member 60 does not need to rotate the shaft 67 of the motor 65, and can be rotated only by its own weight. It should be noted that the mokuro 5 can be small since it is only necessary to rotate the extremely light partition member 60, and a plurality of mocrow members can be arranged side by side as shown in FIG.

In this way, the partition member 60 and the means 6 for driving the partition member 6
5. By preparing a plurality of position detecting means 66 for the separating members, it is possible to detect each diagonal a of a plurality of paper groups / / P, @P2, . . . .

In addition, as a means for detecting one circulation of paper, means for detecting an image pattern on the paper is provided before and after the paper is stored in the intermediate tray 20, and the image pattern at the end of the circulation is memorized and A method of comparing subsequent image patterns is also conceivable.

In the above embodiment, all of the required number of single-sided copied paper groups P, e, P2, etc. are stored in the intermediate tray 20, but since the number of sheets is large, If the number of copies exceeds the number of partition members 61], 612, etc. mentioned above, it is necessary to divide them appropriately.

The present invention is not limited to the above-described embodiments, and for example, the document reversing device may be located between the document sending section and the document table.

Further, when the copying machine has a paper reversing device 25 on the main side as shown in FIG. 10, the flow shown in FIG. 11 can be used instead of the flow shown in FIG. 5.

That is, after the original is fed to the document table glass 3 without reversing it, copies are made from odd-numbered pages, and the document is returned to the document stacking table 32 without reversing it, one copy less than the required number of copies is completed. After copying the original, an operation is performed to invert the original and return it to the original stacking table 32. Next, when the original is sent out, the even-numbered page side of the original is set on the original platen glass 3 facing the glass surface, and the even-numbered page side is placed on the second side of the paper on which the AI page has been copied on the first side. Copying is performed - In this case, the original is returned without being reversed at first, but the paper on which the second side has been copied, that is, the double-sided copy, is reversed by the reversing device 25 and then discharged to the side of the binding machine 50. By performing this operation, a copy P as shown in FIG. A two-sided copy is created.

Note that when copying the final part of the original, it is possible to stack the original in the same state as the original after copying, without turning it over and returning it.

In addition, the embodiment devices shown in FIGS. 1 and 10 both have a document loading table 32.
The original is conveyed with a U-turn between the original platen glass 3, so that the front and back sides of the original are reversed after passing through the jet nozzle 35. It goes without saying that, unlike the embodiments, the present invention is also effective when applied to applications where copying starts from a young page of a document.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of an example of an image forming apparatus with a double-sided copying function, Figure 2 is a flow diagram of a conventional example of creating double-sided copies, and Figures 3 and S4 are originals and single-sided or double-sided copies already made. FIG. 5 is a flowchart for creating a double-sided copy for the apparatus according to the embodiment of the present invention; FIG. 6 is a perspective view of the intermediate tray portion; FIG. 7 is a side view of the separating member portion; FIG. 8 is a slope view of the same, FIG. 9 is an enlarged slope view of a single wooden partition member, and FIG. 10 is a schematic configuration diagram of a modified example device.
FIG. 11 is a flowchart for producing double-sided copies using the apparatus. 30 is a circulating automatic document feeder (RD).
F device), 50 is an automatic paper binding machine. Figure 3 Figure 4 ()\) Hi,ri) Figure 2 Figure 6 ((Manuscript) Figure 5

Claims (1)

[Claims] (1) An image forming means and an intermediate tray that stores the paper on which an image has been formed on the first side by the image forming means]
and an image forming device unit that feeds the image-formed paper from the intermediate tray again to the image forming means on the first side and forms an image on the second side of the paper to obtain a double-sided image-formed product; and a plurality of originals. and a table for loading the documents, and sending the documents one by one from the document loading table to the document exposure section of the image forming apparatus,
and an automatic circulation type document feeder section having means for returning the document on which image formation has been completed to the document stacking table, and when forming double-sided images from a document having images on both sides, Single-sided image formation in which the operation of creating one first-side image forming sheet for each document from the first side of the document and storing it in the intermediate tray is performed for the number of stacked documents. After repeating the cycle for the required number of copies, copying the second side of the original is sequentially performed on the second side of the 1m1 (R1 image forming paper) stored in the intermediate tray, thereby making a double-sided copy. A double-sided image forming apparatus having four characteristics: an image-formed product is obtained;