JP2993617B2 - Copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine, and more particularly to an improvement in a copying machine with a sorter capable of transferring data to both sides of a recording sheet.

[0002]

2. Description of the Related Art Generally, this type of copying machine has a
An original feeder that can circulate and feed the originals stacked on the original stack tray from the lowermost layer onto the platen glass surface is provided. After the sheets are stacked and stored, an intermediate stacking device is provided which can reversely feed the recording paper from the lowermost layer toward the transfer section, so that an image of a single-sided document can be transferred to one or both sides of the recording paper. Also, if a document feeder configured to be able to reverse feed a document is used,
The image of the double-sided document can be transferred to one side or both sides of the recording paper. The created recording paper is configured to be sorted one by one into a sorter provided on the side of the main body.

[0003]

In a conventional copying machine having such a configuration, when performing double-sided copying, there are known two processing modes which are determined depending on a document conveying procedure and a recording paper reversing procedure. .

[0004] First, the form of these two processing modes and the required time characteristics will be described. However, in order to facilitate the explanation, it is assumed that the manuscript is a single-sided manuscript, the number of manuscripts (number of pages) = 2M, and the number of copies = N is known in advance. It should be noted that, depending on whether the number of documents is odd or even, there is a slight difference in the procedure of document transport and the transport of recording paper. However, there is no essential difference for the present invention, and therefore, here, the number is even.

First mode (ADF mode) The copy creation procedure in this mode is as follows (FIGS. 2 to 8). First, the lowermost document (2M pages) from the document stack plate is fed onto the platen glass surface,
Transferring to the surface of untransferred transfer paper conveyed from the paper feed unit is repeated by the number of copies, that is, N times, so that N single-sided transfer papers are stacked on the stack plate of the intermediate stacking unit ( ADU ). Laminate. Next, after the original on the platen glass surface is discharged, the original (2
(M-1 page) on the platen glass surface, and after the "return time" of the intermediate stacking device,
The transfer to the back side of the reverse-fed single-sided processed recording paper is continuously repeated N times, and each sheet is discharged one by one to N places of the sorter.

[0006] Here, the "turning time" of the intermediate stacking device is defined as one of the lowermost layers of the single-sided processed recording paper stacked on the intermediate stacking tray when the recording paper is transferred from the front surface transfer to the back surface transfer. The dead time until the (leading paper) is reversed and reaches the transfer section is an important factor that governs the efficiency of the copying operation. Further, the above procedure is repeated M times, and the double-sided copying of all originals is completed. As a result, 2M pages and N-side double-sided copy are completed.

In the ADF mode, the same page is copied for several minutes at a time. Therefore, the processing becomes more efficient as the number of copies becomes smaller and the number of copies becomes larger, and high-speed processing becomes possible. On the other hand, there are advantages such as:-Since all numbers are created simultaneously in parallel, it is inconvenient if you want to obtain only one copy first. -The number of times of switching back from the intermediate stack unit ( ADU ) is M
And the processing time tends to increase as the number of documents increases. It has such a drawback.

Second mode (RDH mode) The copy creation procedure in this mode is as follows (FIGS. 9 to 14). ′ First, the lowermost document from the document stack tray is fed onto the platen glass surface, and the final document (2
M) Only one page is transferred to the surface of untransferred double-sided transfer paper conveyed from the paper supply unit and stored in a stack plate of the intermediate stacking device. ′ Original on platen glass (2
(M pages), then the next original (2M-1 pages)
Conveys and discharges without copying, feeds the next original (2M-2 pages) on the platen glass surface, transfers only one sheet to the surface of untransferred transfer paper, and stacks Store in the stack tray of the device.

[0009] Then, the operation of '~' is repeated M times,
Until the top document (1 page) on the document stack plate
Copy every other page. As a result, 2M, 2M-2, 2M-4, # 4, 2
The recording paper having the page transferred to one side is laminated. 'Next, after the single-sided processed recording paper on the intermediate stack plate is turned back, odd pages of the document are copied every other page, and one double-sided copy having a continuous number of pages is created. That is, the lowermost original (2M pages) from the original stack plate is conveyed and discharged without copying, the next original (2M-1 pages) is fed onto the platen glass surface, and The image is transferred onto a recording sheet (2M pages have been transferred) that has been reversed and fed from the bottom layer, and is discharged to a sorter. If this operation is repeated M times, one copy of a double-sided copy in which all pages are continuously transferred is completed in the sorter. Further, the above-mentioned operations are repeated N times to complete a 2-M page, N-sided copy of N copies.

The RDH mode makes two-sided copies one by one, so that a small number of copies can be obtained earlier. When copying a large number of originals in a small number of copies, the efficiency is high (the number of cutbacks is small). ) And has the advantage that high-speed processing is possible, but has the drawback that the number of times of switching increases in proportion to the number of copies N, so that the efficiency increases rapidly as the number of copies increases.

As described above, the ADF mode (first
Mode) and the RDH mode (second mode) have their respective characteristics, and it has been desired to switch to a more suitable mode depending on the situation.

In view of the foregoing, it is an object of the present invention to provide a copying machine capable of performing high-speed and high-performance processing by appropriately selecting both modes while taking advantage of the advantages of the ADF mode and the RDH mode.

[0013]

In order to achieve the above-mentioned object, a first configuration of the present invention is to supply originals stacked on an original stacking tray one by one onto a platen glass surface which is an exposure position of a copying machine. A document transport device that discharges the document from the surface of the platen glass after the paper is exposed to the document,
Intermediate stack tray for stacking and storing surface-treated transfer paper,
And an intermediate stacking device that includes a paper feeding unit that feeds the transfer paper stacked and stored in the intermediate stack tray in the storage order, and that re-feeds the surface-treated transfer paper to the transfer unit in a state where the transfer paper is turned upside down. , in the copying machine and a sorter for discharging paper a processed transfer paper by sorting part by one, the
Documents that detect the number of documents stacked on the document stacker
Sheet number detecting means, and when forming a designated number of copy images for a plurality of document images stacked on the document stack plate, performing a copy process on a transfer paper surface for a document image of the same page. After performing the number of copies, the intermediate stacking device reverses the surface-treated transfer paper and re-feeds the same to the transfer section. The copy processing for the original image of the next page is performed on the back of the transfer paper. A first mode in which processing is performed only for the plurality of document images, and a plurality of document images are copied to the surface of the transfer paper every other page, and the surface processing is performed according to the storage order by the intermediate stacking device. A second mode in which the reverse side of the transfer sheet is reversed and re-fed to the transfer section, the original image of the remaining page is copied on the back side of the transfer sheet, and the double-sided copy processing in the page order is performed for the number of copies. And any mode of And automatic selection means for dynamic selection allows selecting the first mode or the second mode manually
Manual selection means, wherein the automatic selection means is selected.
The document number detecting means is activated, and the
The number of documents detected by the number detection means
1st mode based on the input number of copies
Other will replicate treated with either mode of the second mode, before
When the manual selection means is selected, the number of documents
Without operating the stage, the selected first mode
Or that the copying process is performed in the second mode.
And in higher-speed copy mode depending on the number of copies
Not only it can operate, in which the operator side is configured so as to select a desired copy mode.

[0014] As a second configuration, the document feeder, a duplex original configured to be reverse feed, even when creating a two-sided copies from both sides original, and to allow a suitable mode selection Things.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Prior to the description of the embodiment, it is clear how the processing time in the ADF mode (first mode) and the RDH mode (second mode) changes according to the number of originals and the number of copies to be processed. Keep it.

[1] "Single-sided original" → "2-sided copy" Here, for simplicity of consideration, the number of originals is an even number (= 2
M), but the principle of mode selection is the same even for odd numbers. The number of copies is N. If (in the case of ADF mode) copy rate = t ₁ · cutback time = a t _a, since crosscut is performed M times, the time T ₁ required until the number create whole _{is, T 1 = 2M × N ×} t 1 + M × t _a ─── (1) (In the case of RDH mode) In this mode, copying is performed every other document, so the copy speed is lower than in the ADF mode. Copy speed = t ₂ (t ₂ > t ₁ ) dividing crosscut, since in-crosscut time = t _a is common and ADF mode, the time T ₂ required until the number create _{total, T 2 = (2 × 2M} × t 2 + t a) × N = 4M × N × t ₂ + N × t _a ─── (2)

The difference between the equations (1) and (2) is an equation for determining which mode can be processed at a higher speed when M and N are given. _{2 -T 1 = 4M × N ×} t 2 + N × t a - (2M × N × t 1 + M × t a) = 2 (M-α) (N-β) + γ ( where, α, β, γ are Constant) can be written as Therefore, from this equation, the ADF mode and the RDH are obtained in a region where the first quadrant is divided by a hyperbola.
A characteristic diagram as shown in FIG. 15 showing which of the modes is faster is obtained.

In this characteristic diagram, when the number of copies N is in the range of 1 <N ≦ N ₀ (normally, N ₀ = about 5), which mode becomes faster depends largely on the size of the document number 2M. You can see that there is. Under the condition that the number of documents 2M is 5 ≦ 2M, the RDH mode is slightly more advantageous, and under the condition of 2M <5, the ADF mode is slightly more advantageous. On the other hand, in the range of N ₀ <N, the ADF mode is advantageous regardless of the number of documents.

As described above, if only the processing time is considered, which of the ADF mode and the RDH mode is more advantageous can be temporarily determined by a predetermined algorithm. However, both modes are affected by conditions that cannot be examined only by the processing time, as described above. Therefore,
In this embodiment, the copying mode can be selected in consideration of various factors other than the processing time.

[2] “2-sided original” → “2-sided copy” Here, the number of original pages is discussed as an even number, but as in the case of single-sided → double-sided copy, there is no significant difference even if the number is odd. . The number of originals is M '(2M' pages), and the number of copies is N. (In the case of the ADF mode) • Copy speed = t1 • Document reversal time = tr • Reversal time = ta If the reversal number of documents is M 'and reversal is performed for each M' sheets, it is necessary to prepare all copies. The time T3 is as follows: T3 = 2M ′ × N × t1 + M ′ × tr + M ′ × ta (3) (In the case of RDH mode) In this mode, the copying speed is lower than that in the ADF mode because copying is performed every other sheet for a one-sided original, but continuous copying can be performed for a two-sided original (the number of pages is every other page). The copy speed and reversion time per sheet are as follows: copy speed = t1 reversion time = ta, which is the same as in the ADF mode. However, when copying an odd-numbered page, it is necessary to invert once before transferring and then once again after copying, so that the time T4 required to create all the numbers is: T4 = [(t1 + 2tr) × M ' + t1 × M '+ ta] × N = 2M' Nt1 + 2M'Ntr + Nta --- a (4).

From the above, the difference in processing time between the two-sided originals in the copy mode is as follows: T4−T3 = 2M′Nt1 + 2M′Ntr + Nta− (2M′Nt1 + M′tr + M′ta) = 2M′Ntr + Nta−M′tr− M'ta = 2 (M '-. Alpha.') (N-.beta. ') +. Gamma.', And basically indicates a hyperbolic area dividing characteristic as in the case of "single-sided-> double-sided copying". .

[0022] Now, when ta = 3.0 seconds tr = 0.3 seconds t1 = 1.0 seconds, the time of N = 1 part, M '= 50 sheets if if T3 = 265 seconds T4 = 133 seconds and will , RDH mode is much more advantageous. Similarly, 1 <
Even when M '<50, the RDH mode is advantageous.

Next, when N = 3 copies, 6 <M 'is required to satisfy T ₃ > T _{4. If the} number of originals M' is 6 or less, the ADF mode is used, and the number of originals M is 7 or more. Then, the RDH mode is advantageous. If the upper limit of M ′ is 50 sheets when N ≧ 5 parts,
Regardless of whether the value of M ', a T _3> T _4, always, it can be seen ADF mode is advantageous. If these are collectively illustrated, a characteristic diagram of the area division similar to the case of one side → two sides is obtained.

Hereinafter, the present invention will be described with reference to an embodiment shown in the accompanying drawings. FIG. 1 is a sectional view showing the overall configuration of the copying machine of the present application, and FIGS. 2 to 8 are ADF mode (first mode).
FIGS. 9 to 14 are explanatory diagrams of the principle of the RDH mode (second mode). FIG. 15 is a diagram showing how the ADF mode and the RDH mode depend on the number of originals and the number of copies when creating a two-sided copy from a single-sided original. FIG. 4 is a characteristic diagram comparing the processing time.

In FIG. 1, reference numeral 1 denotes a main body of the copying machine of the present invention. The main body 1 includes a document feeder 10 on a platen glass P on an upper portion thereof, a paper feeder 20 on a side of a main body feed side, and a main body discharge side. A sorter 70 is provided on each side. At a predetermined position in the main body 1, an optical unit 30, a transfer unit 40, a reversing drive unit 50, and an intermediate stacking device 60 are provided.

The document conveying device 10 sequentially conveys the documents G stacked and stored on the document stacking tray 11 from the lowermost one sheet onto the platen glass P. After the exposure, the discharged document G is discharged. Is circulated so that the original can be placed on the original stacking tray 11 again from the uppermost surface. That is, when 1-2M pages (2M sheets) of a single-sided original are stacked, the lowermost layer is the final 2M page, the uppermost layer is the first page,
Paper feed is from the bottom, 2M → (2M-1) ──3 → 2 → 1
Paper is fed in page order.

When the original G is a single-sided original, the original is circulated without reversing the original G. When the original G is a double-sided original, one side of the original is exposed and then reversed in accordance with a copy processing mode. A predetermined reversing operation is performed via the path 12 to expose the opposite surface, and further, can be returned to the document stack 11.

The paper feeder 20 is for feeding recording paper that has not been processed on both sides, and feeds various types of recording paper stored in a paper feed stack tray toward the transfer unit 40 as appropriate. It is configured to be able to paper.

The optical unit 30 illuminates the original on the platen glass O with a lamp 31 and irradiates the photosensitive drum 41 of the transfer unit 40 with light reflected from the original via a mirror system 32. Has become.

The transfer section 40 converts the reflected light from the original G from the electrostatic latent image to a toner image by the photosensitive drum 41 and records the recording paper fed from the paper feeding device 20 or the intermediate stacking device 60. It is configured so that it can be transferred to the upper surface of the. Then, the transferred recording paper is subjected to a fixing process in a fixing unit 43 via a transport belt 41, and then discharged to a predetermined tray of a sorter 70 with a copy surface facing upward by a discharge device 44, or The reversing drive unit 50 stacks the intermediate stacking plate 60 on the uppermost surface of the intermediate stacking plate with the copy surface facing down.

The intermediate stacking device 60 is for stacking and storing recording paper in which an image of a document has been copied on one side, and re-feeding it to the transfer section 40 for copying on the opposite side. That is, the intermediate stacking device 60 sequentially stacks and stores the recording paper discharged from the reversing drive unit 50 with the copied surface facing down on the intermediate stacking tray 61, and according to a predetermined timing command, the lowermost layer. It is configured so that one sheet at a time can be sent to the transfer unit 40. At this time, since the recording paper is sent out in a switchback manner in the direction opposite to the carrying-in direction, the recording paper is reversed on the transport path, and the unprocessed surface of the transfer unit 40 is on the upper side (toward the photosensitive drum 41). It is configured as follows.

Here, a mode selecting means (not shown) is built in an appropriate place of the apparatus main body 1, and one of the above-mentioned ADF and RDH modes is selected according to the number of originals and the number of copies set. It is configured to be able to. That is, it is configured such that a more suitable mode can be selected based on, for example, the characteristic diagram of FIG. 15 while taking into account the set number of copies N input by the operator and the number of documents M detected by the appropriate number of documents detection unit. I have.

First, before the main body 1 starts a copying operation, the number of originals G set in the original conveying device 10 is detected by the original number detecting means. (A) Automatic counting is performed in a state where the documents G on the document stack plate are stacked. (B) The operator manually inputs the number of documents. (C) Count the number of originals using the original transport device.
There are three possible forms.

As the detecting means (a), for example, a method of mechanically or optically detecting the thickness of the stacked original, or a method of mechanically or optically detecting the unevenness of the end surface of the stacked original. There is. In the case of this method, if the original is set and the number of copies is input, a copy mode in which the shortest time is always selected is selected, and the fastest copy can be realized. A mechanism is required, which complicates the device configuration and increases costs.

The manual input method (b) has the advantage that the counting time due to the circulating feed of the document feeder can be omitted without using a special mechanism. And is only effective with a small number of documents.

The method of detecting the number of sheets (c) has the advantage that the number of sheets can be detected without providing a special mechanism, and the configuration of the apparatus can be simplified. In this case, before starting the copying operation, it is conceivable to circulate the document in advance and detect the number of copies, and then select a copy mode according to the number of documents and the number of copies to be produced. There is a drawback that waste time is wasted.

Therefore, in the embodiment of the present invention, the first part is the first part.
Copies are processed in the RDH mode (second mode) while counting the number of originals. In the second and subsequent copies, the first or second mode is used in accordance with the number of originals counted in the first copy and the number of copies. It is configured to process automatically. In such a configuration, the apparent waiting time is zero, and one complete copy from the first page to the last page can be obtained early.

The selection of the copy mode is not, in principle, of a nature that the operator should be involved in, but, for example, even if the number of copies is large, RDH can make complete copies one by one. When the mode is desirable, it is convenient if the operator can arbitrarily select the mode. Therefore, in the embodiment of the present invention, a mode selection key for canceling the automatic selection of the two copy modes is provided on an operation panel (not shown) of the main body 1 separately from the above-mentioned automatic selection means. Can be specified arbitrarily.

Further, in the case of a copying machine constructed such that the document is circulated by the document feeder before the copying operation is started, the number of documents is detected, and the copy mode is automatically selected by the manual selection means, It is also possible to manually specify the ADF mode and omit the work of detecting the number of documents, thereby increasing the speed.

A method of selecting a mode according to the number of copies and the number of documents will be described below. In the case of 1 <N ≦ N _{0 Since} the superiority or the inferiority of the two modes changes depending on the size of the number M of documents, the following mode selection method can be considered. According to the number of documents, either ADF (first mode) or RDH (second mode) is selected. In this case, since the number of originals is counted during the processing of the first copy, a higher-speed copy mode can always be selected based on the number of originals. Regardless of the number of manuscripts,
The RDH (second mode) is configured to select the mode. Normally, the area where the boundary between the ADF and the RDH mode changes steeply has a small number of copies of about N ₀ = 5, so the processing time is slightly longer, but the second copy and subsequent copies are completely created for each copy. To select the RDH mode. In this case, a mode in which the processing speed is disadvantageous may be selected, but the number of originals detecting means is unnecessary (the number of times of counting the number of sheets is zero), and a simple apparatus configuration can be realized. The following predetermined boundary value N ₀ parts, above, use of either method of may be determined according to the design specifications of the copying machine. In any case, it is needless to say that automatic selection can be canceled and manual selection can be performed.

When N ₀ <N When the set number N exceeds a predetermined threshold value N ₀ , the copying mode is switched to the ADF mode (first mode). As shown in the characteristic diagram of FIG. 15, this utilizes the property that the boundary line that determines the superiority of the two modes changes sharply at a predetermined threshold value N ₀ (for example, about N = 5). . That is, the number of stackable originals M
Has an upper limit (e.g., 50), and utilizes the fact that the ADF mode (first mode) is advantageous regardless of the number of documents under the condition that the number of copies N is N ₀ <N.

However, even in this case, only the first copy may be configured to be copied in the RDH mode in order to easily obtain a completed manuscript. Also,
As described above, the automatic selection may be canceled, and the RDH mode may be manually selected so that a complete copy can be created. The embodiment of the present application is configured in such a form.

The recording paper K discharged to the sorter 70
Each time one copy is completed, it can be bound by a binding means such as stapling.

In the above embodiment, when the original G is a single-sided original, first, the single-sided original G is stacked and stored in the original stacking tray of the original transporting device 10 to 1 to 2M pages, and the number of copies to be prepared is manually input from the operation panel. The document G is fed one by one from the 2Mth page of the lowermost layer and set on the platen glass P. On the other hand, a recording sheet K of a predetermined size is sent to the transfer unit 40 from the sheet feeding device 20. Then, the image of the document irradiated by the lamp 31 in the optical system unit 30 is formed as an electrostatic latent image on the photosensitive drum of the transfer unit 40 via the mirror system 32 and is further converted into a toner image. Is transferred to one side of the recording paper K. This single-side processed recording paper K
Are stacked on the intermediate stack dish 61. At this time, the first copy is copied in RDH (second mode),
The number of documents is detected. If the set number of copies does not exceed the predetermined threshold value N0, the RDH mode (second mode) is set in accordance with the number of originals and the set number of copies, for example, according to the characteristic diagram shown in FIG. Mode) or ADF mode ( first mode).

On the other hand, when the number of copies N exceeds the threshold value N ₀ , copying is performed in the ADF mode (first mode) regardless of the number of originals except for the first copy.

Thus, the recording paper K copied in the predetermined mode is prepared one by one in the RDH mode, and the target number of copies is simultaneously produced in the ADF mode.
The sheets are stacked and discharged to each storage tray.

Further, when the number of originals is known or when a complete copy is desired, the operator can manually select the copy mode.

[0048]

As described above, according to the present invention, the originals stacked on the original stacking tray are fed one by one onto the platen glass surface, which is the exposure position of the copying machine, and the originals are exposed after the exposure of the originals is completed. A document feeder for discharging paper from above the platen glass surface, an intermediate stack tray for stacking and storing surface-treated transfer paper, and a paper feeding unit for feeding the transfer paper stacked and stored in the intermediate stack tray in the storage order An intermediate stacking device that turns over the surface-treated transfer paper and re-feeds it to the transfer section in a state where the transfer paper is turned upside down;
In the copying machine having a sorter section increments of sorting discharges paper, the number of documents stacked on the document stack tray
Means for detecting the number of originals to be detected, and for forming a specified number of copy images on a plurality of original images stacked on the original stack plate, copying the original image of the same page onto the surface of transfer paper After the processing is performed for the number of copies, the transfer sheet having been subjected to the surface treatment is turned over by the intermediate stacking device, and re-fed to the transfer section. And a first mode in which a process of performing the same number of copies is performed only for the plurality of document images, and a process of copying a plurality of pages of the document image to the surface of the transfer paper every other page, and the intermediate stacking device according to the storing order. The surface-transferred transfer paper is reversed and re-fed to the transfer section, and the original image of the remaining pages is copied on the back side of the transfer paper, and double-sided copy processing in the page order is performed for the number of copies. Any of the second mode Has an automatic selection means for appropriately automatically selected over de, and manual selection means for enabling selection of said first mode or said second mode manually, and the automatic selection
When the means is selected, the document number detecting means is operated.
The number of documents detected by the document number detecting means.
And the set number of copies input by the operator,
Either the first mode or the second mode
If the manual selection means is selected,
Selected without operating the document number detection means.
Copy processing is performed in the first mode or the second mode.
It is possible to operate not only in the higher-speed copy mode according to the number of copies, but also
An excellent effect that it is possible to provide a copying machine capable of outputting in a desired copying mode according to the needs of the operator.
Play a fruit .

Further, the original conveying device is adapted to reverse a double-sided original.
By making the sheet transferable , a copier having a suitable mode selection function can be constituted even when a two-sided copy is created from a two-sided original.

As a result, there is an excellent effect that a high-performance copying machine having both high speed and high efficiency by automatic selection of a copy mode and ease of use by manual selection can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the overall configuration of a copying machine of the present application.

FIG. 2 is a diagram illustrating the principle of a first step in an ADF mode (first mode).

FIG. 3 is a diagram illustrating the principle of a second step in an ADF mode (first mode).

FIG. 4 is a diagram illustrating the principle of a third step in the ADF mode (first mode).

FIG. 5 is a diagram illustrating the principle of a fourth step in the ADF mode (first mode).

FIG. 6 is a diagram illustrating the principle of a fifth step in the ADF mode (first mode).

FIG. 7 is a diagram illustrating the principle of a sixth step in the ADF mode (first mode).

FIG. 8 is a diagram illustrating the principle of a seventh step in the ADF mode (first mode).

FIG. 9 is a diagram illustrating the principle of a first step in an RDH mode (second mode).

FIG. 10 is a diagram illustrating the principle of a second step in the RDH mode (second mode).

FIG. 11 is a diagram illustrating the principle of a third step in the RDH mode (second mode).

FIG. 12 is a diagram illustrating the principle of a fourth step in the RDH mode (second mode).

FIG. 13 is a diagram illustrating the principle of a fifth step in the RDH mode (second mode).

FIG. 14 is a diagram illustrating the principle of a sixth step in the RDH mode (second mode).

FIG. 15 is a characteristic diagram comparing the processing time with respect to the number of documents and the number of copies in the ADF mode and the RDH mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Copier main body 10 Document feeder 20 Paper feeder 30 Optical unit 40 Transfer part 41 Photoreceptor drum 50 Reversal drive part 60 Intermediate stacking device 61 Intermediate stack plate 70 Sorter G Original K Recording paper

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanobu Kono 2970 Ishikawacho, Hachioji-shi, Tokyo Inside Konica Corporation (56) References JP-A-4-50959 (JP, A) JP-A-60-27265 (JP) JP-A-59-74574 (JP, A) JP-A-1-235960 (JP, A) JP-A-4-19671 (JP, A) JP-B-63-32699 (JP, B2) (58) Surveyed fields (Int.Cl. ⁶ , DB name) G03G 15/00 303 G03G 15/36 G03G 21/00 370-540 G03G 21/02-21/04 G03G 21/14 G03G 21/20 G03G 15/00 106 G03G 15/00 510-534

Claims (2)

(57) [Claims] 1. One document stacked on a document stack plate
Feeds one by one onto the platen glass surface, which is the exposure position of the copier
After the exposure of the original is completed, the original is
A document feeder that discharges paper from above the glass surface, an intermediate stack plate that stacks and stores surface-treated transfer paper,
And transfer paper stacked and stored in the intermediate stack dish.
Transfer paper with surface treatment, equipped with paper feeding means for feeding paper in the order of delivery
Is being fed back to the transfer unit with
Intermediate stacking device and sorter that sorts and transfers processed transfer paper one by one
And a copying machine havingDetect the number of documents stacked on the document stack plate
Document number detecting means,  A plurality of original images stacked on the original stack plate are
When the specified number of copies are formed, the copy process on the transfer paper surface for the original image of the same page is performed.
After performing the number of copies, the intermediate stacking device
Invert the surface-treated transfer paper to the transfer section
Re-feed the paper and copy the next page of the original image onto the back of the transfer paper.
Performing the copying process for the number of copies
A first mode in which only the image is printed, and a process in which a multi-page document image is copied to the surface of the transfer paper every other page
The table is stored in the intermediate stacking device according to the storage order.
Turn the surface-treated transfer paper upside down and refeed it to the transfer section
Then, the original image of the remaining pages is copied and processed on the back side of the transfer paper.
A second mode in which double-sided copying in accordance with the page order is performed for the number of copies
Mode is automatically selected as appropriateAutomaticChoice
meansWhenThe first mode orSaid2nd mode can be selected manually
To beManual selection means, When the automatic selection means is selected, the number of originals is detected.
Means is operated, and is detected by the document number detecting means.
And the number of copies set by the operator
The first mode or the second mode based on
Copy processing in that mode, When the manual selection means is selected, the document number detection
Operating means The first mode selected
Alternatively, copy processing is performed in the second mode. That
Copier featured. 2. A copying machine according to claim 1, wherein said document feeder is configured to be able to reversely feed a two-sided document.