JPH063556B2 - Double-sided copy control method using single-sided original - Google Patents

Description

The present invention relates to a method for performing double-sided copying from a sheet-shaped single-sided original by controlling the feeding of the original in association with the copying operation, and moreover, the copying is performed page by page for each part. The present invention relates to a method in which they are discharged side by side.

Conventionally, when a double-sided copy function is connected to an automatic sheet feeder, especially a circulating type sheet automatic feeder, when a sheet original is fed from the last page and a double-sided copy is obtained from a single-sided original, an odd number of sheet originals At this time, in order to make the last page a blank space, it is necessary to have a detecting means for detecting whether the number of sheet originals is an even number or an odd number, and the sheet originals are configured to be counted by another means before the sheet originals are fed. , But there were some drawbacks that led to the pain of the manuscript and the cost increase.

In view of the above points, the present invention has been made to solve the above-mentioned drawbacks, and automatically counts the number of sheet originals at the same time while automatically feeding and copying the originals to determine whether it is an even number or an odd number. By feeding, it is possible to accurately perform double-sided copying from a single-sided original.

[Means for Solving the Problems] In the double-sided copying method using a single-sided original according to the present invention, the lowermost of a large number of sheet originals stacked on the original placing table on the circulating sheet automatic document feeder is placed on the original platen. When the sheet originals are supplied one by one and copied onto the copy paper, every other sheet original supplied on the original platen is read and copied on one side of each copy paper.
At the same time, the number of sheets of the sheet document is counted, and it is judged whether it is an even number or an odd number. When it is an even number, the sheet document is immediately supplied for the second time, and is supplied onto the document platen before the completion of the counting. The sheet originals that have been copied but not copied are sequentially read, and the other side of the copy sheet is copied, and when there is an odd number of sheets, one side of the copy sheet corresponding to the original of the last page is left as a blank sheet ejection tray. Then, the sheet originals of the other pages are read by performing the same operation as when the even number of sheets, are copied on the other side of each copy sheet, and are stacked in the page order on the discharge tray.

[Operation] In the first cycle, from the last page of the single-sided original to the first page, the single-sided originals are sequentially supplied onto the original platen, and the supplied single-sided originals are sequentially copied on one side of each copy paper. At the same time, the total number of single-sided originals is counted.
In the next cycle, each page of the original that has not been copied is sequentially copied to the other side of the copied copy paper. However, only when the total number of sheets is an odd number, only the copy paper on which the last page is copied is discharged onto the other side without copying. An embodiment of the double-sided copying method according to the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of an embodiment of the present invention, showing the components of each part and the original and copy paper passages. In FIG. 1, A is a circulating sheet document feeder,
B is a main body of a copying machine for making a double-sided copy. 1 is the first
The document table, which descends to the left and is inclined.
Adjacent to the left side of the first document table 1 is a feeding roller 2a.
Is provided, the feeding belt 3 is wrapped around the feeding roller 2a, and the feeding roller 2 is attached to the other end of the feeding belt. The feeding belt 3 is wound around the feeding rollers 2a and 2 and rotated in the direction of arrow C. The feeding roller 2 is rotationally driven by a driving means described later so as to move the feeding belt in the direction of arrow C. Separation rollers 4 and 4a are the feeding rollers 2 on the left side.
Are arranged in a line above the two separation rollers 4, 4a.
The separation belt 5 is wound around the belt, and the separation belt 5 is adapted to rotate in the direction of arrow D. In this way, one sheet-like document stacked on the document table 1 is separated from the lowermost part between the separation belt 5 and the feeding belt 3. A conveying roller 6 is located below the left-hand side feeding roller 2 on the lower left side, and is driven to rotate in a selected direction in both directions by driving means described later. Reference numerals 6a and 6b denote rollers that press the conveying roller 6 against each other, and are located on the right and left sides of the conveying roller 6. Reference numeral 7 denotes a conveyor belt driving roller, which is directly below the left feeding roller 2. And this conveyor belt drive roller 7
Is driven to rotate in a selected direction out of both directions by a driving means described later. 7a is a conveyor belt driven roller, and a conveyor belt 8 is wound between the conveyor belt driving roller 7 and the conveyor belt driven roller 7a. And the driven roller 7
“A” is located at the right end of the circulating sheet document feeder A.

Reference numeral 10 denotes a switchback mechanism arranged diagonally above and to the left of the feeding roller 2, the details of which will be described later. 11, 11a is 2
As one paper discharge roller, a paper discharge roller 11a is provided above the separation roller 4a, and the paper discharge roller 11 is in pressure contact above the paper discharge roller 11a. Then, the paper discharge rollers 11a and 11 are used for the originals after copying to copy the originals on the first original placing table 1
It also has a function of discharging the paper to the upper side.
The conveying force of 11 is weaker than that of the switchback mechanism 10.

Reference numeral 9 denotes a switchback mechanism, which will be described later, and is located apart from the left side of the conveyor belt drive roller 7. Further, a light detector 28 combining a light source and a light sensor is provided below the conveyance belt driving roller 7 and the roller 6a, a similar light detector 29 is provided immediately after the right side of the switchback mechanism 9, and immediately above the roller 6b. A light detector 30 similar to the above is also provided in the switchback mechanism 10
A light detector 31 similar to
Similar photodetectors 11 'are provided near the right side of 1a, respectively.

The photodetector 28 is provided with a document counting means for detecting the trailing edge of the document to generate a pulse and counting the pulse. Also, the pulse is not shown after a predetermined time after the pulse is input. A timer means is provided for the control circuit.

Further, the first document path Ia includes the feeding roller 2 and the roller 6a,
Between the transport roller 6 and the transport belt drive roller 7, the second document path IIa is between the transport belt 8 and the platen glass 12, and the third document path IIIa is between the transport belt drive roller 7 and the switchback mechanism 9. The fourth document path IVa is between the switch mechanism 9, the fifth document path Va is between the switch mechanism 9 and the roller 6b transport roller 6, and the sixth document path VIa is the switch mechanism 10 and the discharge roller 1.
The seventh original passage VIIa is provided between the conveyor belt driving roller 7, the roller 6b, and the paper discharge roller 6 between the first and the first rollers 11a and 11a. Reference numeral 7'denotes a switching device for switching the moving path of the document, which is the second document path IIa, the first document path Ia, and the third document path Ia.
This is for switching and connecting any one of the passage IIIa and the seventh original passage VIIa.

Next, the copying machine body B will be described. Reference numeral 12 is a platen glass, 13a is an exposure source for exposing a document, 13b and 13c are moving mirrors, 13d is an imaging lens, 13e and 13f are fixed mirrors, and the exposure source 13a and the moving mirror 13b are integrally formed in the direction of the arrow in the figure. The moving mirror 13c moves forward to scan the original, and the moving mirror 13c moves forward at half the speed of these movements to contribute to the original scanning. Exposure source 13a, moving mirror 13
b, 13c, imaging lens 13d and fixed mirror 13e,
The document scanning optical system 13 is constituted by 13f. 16 is
A photosensitive drum having a photoconductive layer and an insulating layer on a conductive substrate is rotated in the direction of the arrow in the figure by a copy command with the shaft 16a as the center of rotation. Reference numeral 14a is a pre-exposure / static eliminator, 14b is a primary charger, 14c is a simultaneous charging / exposure device, 13g is an exposure unit of the photosensitive drum 1, 15 'is a total exposure source, 15 is a developing device,
Reference numeral 14d is a transfer charger, 14e is a separation charger, and 17 is a cleaning device.
It is provided around 6 respectively.

18 is a paper feed cassette, 19 is a paper feed roller, 20 and 20a
Is a register roller, and 21 is a conveyor belt that conveys the copy paper after transfer to the fixing rollers 22 and 22a. Reference numeral 23 is a switch back mechanism which will be described later, reference numeral 32 'is a photodetector including a light source and an optical sensor provided on the passage switch 34 side of the switch back mechanism 23, and 24 is a rear end regulating plate 24a movable to a position between XY. This is an intermediate tray for storing the copy paper after one-sided copying temporarily. Reference numeral 33 is a photodetector including a light source and an optical sensor provided on the intermediate tray 24. Reference numeral 25 is a sheet re-feeding roller for re-feeding the copy paper that has been copied on one side (hereinafter abbreviated as single-sided copy paper) stored in the intermediate tray 24 for double-sided copying, and 26 and 26a are discharge sheets of copy paper. Laura, 27
Is a paper ejection tray.

Reference numeral 34 designates the fixing rollers 22 and 22a and the discharge rollers 26 and 2
6a is a passage switching device with a triangular side surface provided between
When it is rotated about the shaft 35 by means (not shown) and switched, and is set to the first position shown by the broken line, the copy paper third passage IIIb leading from the fixing rollers 22, 22a to the intermediate tray 24 is Closed and fusing rollers 22,2
Copy paper 8 from the 2a to the discharge rollers 26, 26a
Passage VIIIb is opened. The passage switching device 34 is rotated by an unillustrated means about the shaft 35 as a rotation center to be switched,
When set to the second position shown by the dot-dash line in the figure, the copy paper third passage IIIb is opened and the copy paper eighth passage VII is opened.
Ib is closed. Regardless of the state of the path switching unit 34, the seventh copy paper path VIIb from the switch back mechanism 23 to the paper discharge rollers 26, 26a is open.

Ib is from the paper feed cassette 18 to the register rollers 20, 20
A copy paper first path to a, IIb a second copy paper path from the photosensitive drum to the fixing rollers 22, 22a, IVb a fourth copy paper path from the switchback mechanism 23 to the intermediate tray 24, Vb from the intermediate tray 24. Paper feed roller 2
5 is a copy paper fifth path, and VIb is a copy paper sixth path from the paper feed roller 25 to the register rollers 20 and 20a. In the copy paper fourth passage IVb, a roller pair that is rotationally driven by means (not shown) is provided as shown.

Regarding the switchback mechanisms 9, 10, 23,
Two abutting rollers that rotate in opposite directions are provided, and independent rollers that are pivotally supported by the same connecting plate are provided on these rollers. Since it is supported, this connecting plate is provided so as to rotate in either direction. As a result, either one of the rollers is brought into contact with the opposing roller, and both rollers rotate in either direction. For example, in the switchback mechanism 23, the drive roller 23a on the lower right side is rotated counterclockwise by means (not shown), and the roller on the right side is brought into contact with this drive roller 23a by means (not shown). The intermediate tray 24
Is transported to the opposite side. Of course, at this time, even if the lower left roller is in contact with the drive roller 23a and is rotated,
Since this roller and the roller on the left side are not in contact with each other, they are not related to the conveyance of copy paper. If both of them are switched and come into contact with each other, this roller is rotating in the clockwise direction, so that the copy sheet is conveyed to the intermediate tray 24 side. 9a and 10a are drive rollers and 23a of the switchback mechanism 9 and 10 which are rotationally driven by a drive mechanism described later.
Is a drive roller of the switchback mechanism 23 which is also driven by means not shown.

Next, the document separating section of the apparatus shown in FIG. 1 for explaining the copying method according to the present invention will be described with reference to FIGS. 2 and 3.

FIG. 2 is a top view showing the document separating section. FIG. 3 is a side view showing the document separating section.

In FIGS. 2 and 3, reference numerals 34 'and 34'a denote partition plates for distinguishing a document before exposure from a document after exposure. The partition plates 34 "and 34" a are supported by the branch plate arms 35 "and 35" a by the branches 36 and 36a. Further, 37 and 37a are friction plates, and the separation roller shaft 38
Arm gear 4 engaged with gears 39, 39a fixed to
0, 40a and the partition plate arms 35 ', 35a' axially supported by the shafts 32, 32a, respectively, and are rotated by the separation rollers 4, 4a.
A load in the direction of arrow G is applied to 5'and 35'a. This facilitates document feeding from the document table. In addition, the partition plate arm 35 ', via the feeding belts 3a, 3b (3),
Rollers 41, 41a receiving the load of 35'a (however, 4
1a is attached (not shown). 44,44a
Are the respective shafts 43, 43a on the partition plates 34 ', 34'a and the respective shafts 42, 4 on the partition plate arms 35', 35'a.
It is each spring hung between 2a. Partition plate 34 ', 3
If there is no document between 4a 'and the feeding belts 3a, 3b (Fig. 2), the partition plates 34', 34a 'will be the feeding belts 3
It is pulled to the left by the frictional force from a and 3b, and fulcrum 3
The rotation starts around 6, 36a. As the rotation progresses, the line connecting the shafts 42 and 43 and the shafts 42a and 43a crosses the fulcrums 36 and 36a. Then the springs 44,44
A causes a toggle operation to move the partition plates 34 ', 34'a in the directions of arrows E and F, respectively, to reach the positions shown by the dotted lines, and bring them into a folded state. Partition plate 3
The outer peripheries 45, 45a of the 4 ', 34'a are cam-shaped, and the partition plates 34 ", 34" a and the partition plate arm 3 are provided.
When 5'and 35'a rotate in the direction of arrow G, the cams 45 and 4
Shafts 48, 48 mounted at positions engaging with 5a respectively
It is constructed so that the partition plates 34 'and 34 "a are respectively returned to the F direction by a. 47 is an optical sensor for detecting that the partition plate arm 35' is rotated in the G direction. It can be determined that one copy cycle is completed.

FIG. 4 is a more detailed explanatory diagram including the drive mechanism of the circulation type sheet original feeding apparatus A of FIG. In the figure, the constituent elements denoted by the same reference numerals as those in FIGS. 1 to 3 have already been described, and therefore the description thereof is omitted here. Reference numeral 50 is a motor for rotational driving, 51 is a pulley provided on the rotation shaft of the motor 50, 52 is a pulley provided on the rotation shaft of the paper discharge roller 11a, 53 is a pulley pivotally supported by a machine frame (not shown),
Reference numeral 56 is a pulley provided on the shaft of the transport roller 6, 57 is a pulley provided on the shaft of the drive roller 10a of the switchback mechanism 10, and 59 is a pulley provided on the shaft of the drive roller 9a of the switchback mechanism 9. 54 is a belt for power transmission, which is hung between the pulleys 51, 52 and 53, 55 is also a belt which is hung between both pulleys 53 and 56, and 62 is also a belt which is both pulleys 56 and 57.
It is hung between the two, and 58 is also a belt and both pulleys 5
It is hung between 6 and 59.

Reference numeral 60 denotes a clutch for transmitting the rotational power from the motor 50 to the conveyor belt drive roller 7 via the pulley 51, and it is possible to switch between forward rotation and reverse rotation. Also,
Reference numeral 61 is a clutch for transmitting drive from the pulley 53 to the feeding roller 2 and the separation roller 4. The forward rotation direction of the motor 50 is the direction in which the pulley 51 rotates counterclockwise in FIG.

FIG. 5 is a partially omitted schematic block diagram showing the control system of the copying machine shown in FIGS. 1 to 4. The parts using the same reference numerals as above are the same as the above-mentioned constituent elements, and the explanation thereof will be omitted. Reference numerals 71, 72, 73 are amplifiers, 74, 75, 76 are one-shot multivibrators, and one-shot multivibrators 75, 76 generate one pulse at the trailing edge of the pulse. The outputs of these one-shot multivibrators 74, 75, 76 are input to a control circuit 70 such as a microprocessor.

Reference numeral 77 is a T-flip floppy, and the input side is configured to input the output of the one-shot multivibrator 76 and the output of the control circuit 70 through a common line. Also, this T
The flip-flop output is provided to the control circuit 70. Reference numeral 78 is a motor drive circuit, which controls the motor 50 to the control circuit 7
It is for driving by a signal from 0. 79,
Reference numeral 80 denotes a clutch control circuit for engaging and disengaging the clutches 61 and 60 by control signals from the control circuit 70, respectively. Further, the control circuit 70 is connected to control the control system 81 of the copying machine body B, but since this part is well known, detailed description thereof will be omitted. In addition, the control circuit 70 is connected to other parts of the circulating sheet document feeder A for switching the parts to be controlled, for example, the switch 7'switch back mechanism 10, 23. It is omitted for simplicity of explanation.

FIG. 6 is a flow chart for explaining one embodiment of the copying method according to the present invention.

Next, a double-sided copying method according to the present invention will be described with reference to FIGS.

First, a sheet document having an image (not shown) on one side only is stacked on the document table 1. In this case, the image of the sheet document is directed to the upper side, and the sheet documents (not shown) are stacked in the order of pages from the top. Has been. Next, the photosensitive drum 16 is rotated in the direction of the arrow in the figure by the copy command, and the motor 50
Rotates forward. By the normal rotation of the motor 50, the constituent elements of the circulating sheet document feeder A are moved or rotated in the direction of the solid line by the arrows shown in FIGS. 1 and 4. That is, the power of the positive rotation of the motor 50 is the belt 54 and the pulley 5.
3, the separating roller 4 is rotated in the clockwise direction in FIG. 4 through the clutch 61, and accordingly, the separating belt 5 is moved in the direction of the arrow D in the drawing, and the feeding roller 2 is also rotated counterclockwise in FIG. The feeding belt 3 is rotated in the peripheral direction, and the feeding belt 3 is accordingly moved in the direction of arrow C in the drawing. As a result, the partition plate 34 'is placed on the originals placed on the original placing table 1 as described later.
a and 34 'are set only at the beginning of the original feeding cycle, and the first original from the bottom (hereinafter referred to as the bottom original) is fed by the feeding belt 3 and the separation belt 5 to the first original.
It is sent to the passage Ia. The power of the normal rotation of the motor 50 is the pulley 51, the belt 54, the pulley 53, and the belt 5.
5, the conveying roller 6 is rotated through the pulley 56 in the counterclockwise direction in FIG. 4, that is, in the clockwise direction in FIG.

The power of the normal rotation of the motor 50 is transmitted to the conveyor belt drive roller 7 via the pulley 51 and the clutch 60, and
In the figure, the roller 7 is rotated counterclockwise to move the conveyor belt 8 in the direction of arrow C '. Therefore,
The lowermost document fed into the document first path Ia as described above is fed to the transport belt driving roller 7 side by the rotation of the transport roller 6 and the roller 6a. Here, since the switching device 7'is switched so as to connect the first original path Ia and the original table 2 path IIa, the lowermost original is moved by the conveyor belt 8 in the second original path IIa in the direction of arrow C'in the drawing. After being conveyed, the photodetector 28 detects the trailing edge of the lowermost document (hereinafter, the trailing edge of the document refers to the trailing edge of the document being fed) and is set in advance. After a predetermined short time in response to the clock signal, the clutch 60 is released, the conveyor belt driving roller 7, that is, the belt 8 is stopped, and the lowermost original is set on the copy position of the platen glass 12.

Next, after the document has passed through the known copying process or after not undergoing the copying process, the clutch 60 is engaged so that the conveyor belt driving roller 7 is rotated in the reverse direction, that is, the roller 7 is rotated in the direction of the arrow shown by the broken line. To do. Also, the switching device 7 '
The switching state of the original remains unchanged, and accordingly, the second passage of the document
IIa is connected to the seventh original passage VIIa. Even at this time, since the motor 50 is rotating in the normal direction, the transport roller 6 is rotating in the clockwise direction in FIG. 1 as described above. The rollers of the switchback mechanism 10 are in contact with the drive roller 10a. The drive roller 10a is integrated with the conveying roller 6 in the counterclockwise direction in FIG. 4, and is rotated counterclockwise in FIG. 4 via the pulley 56, the belt 58, and the pulley 59 that are rotated by the rotational power of the motor 50. It rotates in the clockwise direction, that is, in the direction of the arrow shown in the clockwise direction in FIG. Further, the paper discharge roller 11a inputs the power of the normal rotation of the motor 50 through the pulley 51, the belt 54, and the pulley 52, and moves in the counterclockwise direction in FIG. 4, that is, in the clockwise direction in FIG. It's spinning. Therefore, since the conveyor belt drive roller 7 is rotating in the direction of the broken arrow, the conveyor belt 8 moves in the direction opposite to the arrow C'in the figure, so that the original on the platen glass 12 is transferred to the original second path IIa. Manuscript No. 7
Send to passage VIIa.

Further, the original is sent to the sixth original passage VIa by the conveying roller 6, the roller 6b and the switch back mechanism 10. Further, this document passes through the document sixth passage VIa and is discharged to the right by the discharge rollers 11 and 11a, and is stacked on the uppermost part of the document stacked on the document mounting table 1. However, in this case, since the original is the first original from the bottom of the original, the original is placed on the top of the original through the partition plates 34 'and 34'a.

After the clutch 61 for rotating the separation roller 4 and the feeding roller 2 is engaged, a predetermined clock signal is counted in advance and reaches a predetermined count number, and then the clutch 61 is released after a predetermined time. To do. That is, after the document at the lowermost position on the document table 1 is completely fed, the clutch 61 is detached and the rotations of the separation roller 4 and the feeding roller 2 are stopped and the next document feeding is stopped. Light detector 11 '
When the rear end of the document being discharged is detected by, when the document needs to be fed by this detection signal, the clutch 61 engages to rotate the separation roller 4 and the feeding roller 2 to separate them again. The belt 5 is moved in the direction of arrow D, the feeding belt 3 is moved in the direction of arrow C, and the feeding of the document is started in the same manner as above. In this way, the originals on the original placing table 1 are successively fed and returned to the originals on the original placing table 1.

The control part in the above operation will be described in more detail. In response to the copy command, the control circuit 70 causes the motor 50 to rotate normally through the motor drive circuit 78. Next, the control circuit 70
Engage the clutches 61 and 60 via the clutch control circuits 79 and 80, respectively. At this time, the clutch 60 is engaged so as to rotate the conveyor belt driving roller 7 in the forward direction, that is, in the counterclockwise direction in FIG.

The clutch 61 is removed after a predetermined time. That is, the control circuit 70 causes the clutch 61 to move to the clutch control circuit 7
After engaging via 9, count the clock signal,
After the count value reaches a predetermined value (that is, a predetermined time), the lowermost document on the document table 1 is fed, and then the clutch 6
The control circuit 70 is detached from the control circuit 70 via the clutch control circuit 79 to prepare for the next document feeding.

The photodetector 28 detects the trailing edge of the document, and this detection signal is given to the one-shot multivibrator 76 via the amplifier, and the one-shot multivibrator 76 outputs one pulse at the trailing edge of this detection signal. To occur. The control circuit 70 that has received this pulse counts the clock signal, and after the count value reaches a certain value, that is, after a predetermined time after the photodetector 28 detects the trailing edge of the document, the control circuit 70 is detected. The clutch 6 via the clutch control circuit 80.
0 is released. As a result, the original is set in the copy area on the platen glass 12.

Next, when the control circuit 70 needs to copy the document,
The copying machine body control system 81 is controlled to perform copying.

When the copy command is a one-sided copy command,
Immediately after the copy command, the T-flip flop 77 is brought to a certain initial state, that is, the initial state of the T-flip flop 77 is when the Q output is at "high" level. If the output is in the "high" level in the initial state, the control circuit 70 gives one pulse to the T-flop and sets the Q output to the "high" level to set the initial state. After this, the T-flip flap 7 as described above.
Reference numeral 7 inputs the pulse from the one-shot multivibrator 76 for each document to be sent.

After the original document provided on the platen glass 12 is copied or not copied (this is done because every other sheet is copied), the control circuit 70 controls the clutch 60 via the clutch control circuit 80. Engage. The engaged state of the clutch 60 at this time is such that the conveyor belt drive roller 7 is rotated in the reverse direction, that is, the belt is rotated in the clockwise direction in FIG. After this, when the fed document is circulated and discharged, the trailing edge of the pulse generated by the photodetector 11 'is transmitted to the one-shot multivibrator 75 via the amplifier 72. After the rear end of the discharged document is detected by the photodetector 11 'and the one-shot multivibrator 75 generates one pulse,
The control circuit 70 engages the clutch 61 to start feeding a new document, and immediately thereafter, changes the engagement state of the clutch 60 so as to rotate the transport belt driving roller 7 in the forward direction.

The above cycle is repeated and copied one after another,
When the copy command is the first cycle of the one-sided copy, after one cycle of the original set on the original placing table 1, the optical sensor 47 sends a detection signal to the amplifier 71 and the one-shot multivibrator 74 as described later. To the control circuit 70. At this time, the control circuit 70 detects the output state of the T-flip flop 77 to detect whether the number of originals on the original table 1 is an odd number or an even number. That is, T
The flip-flop 77 has an even number when the Q output is at a "high" level, and an odd number when the output is at a "high" level.

It should be noted that the output state of the T-flip flop 77 may be used in order to distinguish whether it is an odd-numbered sheet or an even-numbered sheet from the bottom of the original set first. That is, if the original is sent and one pulse is generated from the one-shot multivibrator 76 and the sent original is set on the platen glass, the control circuit 70 detects the output state of the T-flip flap 77. Good. As a result, whether the odd-numbered or even-numbered sheets are detected from the lowermost portion of the original set first, and the control circuit 70 controls the copying machine main body control system 81 as necessary to shift to the copy operation.

Next, here, as an example, the second and fourth sheets from the lowermost document are
A case where the first, sixth, ... Originals are first copied on one side will be described with reference to FIGS. 1 to 6. First, information for copying an even-numbered sheet from the lowermost original is input to the control circuit 70 (however, this information may be incorporated in the control circuit 70 in advance by software).
When the lowermost original is conveyed to the platen glass 12 through the first original passage Ia and the second original passage IIa by the copy command as described above, the seventh original passage VIIa and the sixth original passage are promptly transferred as described above. The original document surface is ejected to the original placing table 1 by the ejection rollers 11 and 11a through VIa. At this time, the copying machine body B is not interlocked. Next, the second original from the lowermost portion passes through the first original passage Ia and the second original passage IIa in the same manner as above, and the platen glass 1
It is conveyed to the upper part 2 (101). At this time, the state of the T-flip flap 77 changes as described above depending on the originals to be sent, and at this time, the Q output is in the "high" level state. The control circuit 70 which has input this state controls the copying machine main body control system 81 to start the copying operation. That is, the exposure scanning optical system 13 moves in the direction of the arrow shown in the figure to slit-expose the original image on the exposing portion 13g of the photosensitive drum 16 rotating in the direction of the arrow shown.

The photosensitive drum 16 includes a pre-exposure / static eliminator 14a and a primary charger 1.
4b, the simultaneous charging / exposure device 14c, and the entire surface exposure source 15 'perform pre-electrification, primary charging, simultaneous secondary charging exposure, and overall surface exposure to form an electrostatic latent image. This electrostatic latent image is developed by the developing device 1.
5 visualizes as a toner image.

On the other hand, the copy paper supplied from the cassette 18 through the paper feed roller 19 passes through the copy paper first path Ib and is then sent to the photosensitive drum 16 at a timing by the register rollers 20 and 20a. After that, the toner image is transferred onto the copy paper by the transfer charger 14d. After that, the copy paper transferred by the separation charger 14e is separated from the photosensitive drum 16, and is passed by the conveyance belt 21 through the copy paper second path IIb and the fixing roller 2.
It is fixed by 2, 22a to become a single-sided copy paper (10
2). The path selector 34 is in the second position shown by the alternate long and short dash line in the figure, and the switchback mechanism 23 is on the opposite side of the figure, that is, the left roller and roller are in contact, and the right drive roller 23a and roller are in contact. Since the sheets are separated from each other, the one-sided copy sheet passes through the copy sheet third passage IIIb, the switchback mechanism 23 and the copy sheet fourth passage IVb, and the copied side is faced up and stored in the intermediate tray 24. (103).

Of course, at this time, the trailing edge regulating plate 24a of the intermediate tray 24 is in the X position, and the re-feed roller and the accommodated single-sided copy sheet are not in contact with each other, so that the sheet is not re-fed.

On the other hand, for the second original from the bottom, on the platen glass 12, the original 7th passage VIIa and the original 6th passage VIa are transferred from the platen glass 12 after the one-sided copying in the same manner as described above.
After passing through the sheet, the sheet is again placed on the uppermost part of the document placing table 1 by the discharge rollers 11 and 11a. The original document to be fed next (third sheet from the bottom) is counted, that is, conveyed to the platen glass 12 in the same manner as the document at the bottom in order to change the output state of the T-flip flap 77. Machine body B
The document conveyed without interlocking returns to the document table 1 in the same manner as the lowermost document. The above operation is repeated for the number of originals placed on the original placing table 1,
By feeding these documents, single-sided copy sheets are stacked on the intermediate tray 24 in the copying machine with the copy side up. In this way, the first cycle of document feeding is completed.

Now, a case where the uppermost original of the originals set here is to be fed will be described with reference to FIGS. 2 and 3. Partition plates 34 ', 34'a are located just above the top document.
Exists. When the top document is fed, the partition plate 3
Since 4'and 34'a are in contact with the feeding belt 3 (3a, 3b), the partition plates 34 'and 34'a rotate in the direction of arrow E due to the frictional force between them, and the force of the spring 36 causes the partition plates 34' and 34'a to rotate in the direction shown in FIG. It will be in the state of the dashed line. Here, partition plate arms 35 ', 35 "
Since frictional plates 37, 37a apply a load to a in the direction of arrow G, when the partition plates 34 ', 34'a are folded, they start rotating in the direction of arrow G. The feeding rollers 2 and 2a and the separating rollers 4 and 4a are provided when the trailing ends of the originals are provided on the downstream side of the sheet bus and stop when detected by the optical sensor 47, so that the partition plate arms 35 'and 35'a. When the uppermost document is fed, it will rotate and then stop at the position indicated by the broken line in the figure. When the uppermost document is fed, that is, when the partition plate arms 35 and 35a are detected by the optical sensor 47,
The uppermost original is returned to the original placing table 1 again, and the feeding roller 2 and the separating roller 3 are stopped until one cycle is completely completed, and rotation is started at the first sheet in the second cycle. The partition plates 34 'and 34'a are placed on the uppermost original.

It should be noted that after the originals are stacked on the original placing table 1 before the copy instruction, the partition plate 3 is operated by the same operation as described above by the copy instruction.
4, 34a rotate in the G direction and ride on the uppermost document.

After one-sided copying is completed in the first cycle document feeding as described above, copying is performed on the back side (non-copied side) of the one-sided copy sheet by the second cycle document feeding. Here, by the document feeding in the first cycle, it is determined whether the number of originals is odd or even depending on the output state of the T-flip flop 77 as described above. Then, the second cycle of document feeding starts.

After the copy command, at the time when the second pulse sent from the optical sensor 47 through the amplifier 71 and the one-shot multivibrator 74 is input, that is, at the time when the first cycle of document feeding is completed, the control circuit 70 Inputs the output state of the T-flip flop 77 (104). When the output of the T-flip flop 77 is at the "high" level, that is, in the even-numbered-sheet mode, 1, 3, 5 from the bottom of the document.
The main body B of the copying machine interlocks with the first document to perform copying. When the first original from the bottom is placed on the platen glass 12 through the first original passage Ia and the second original passage IIa by the circulating sheet original feeding device A in the same manner as described above (105), T- Since the output state of the flip-flop 77 is the "high" level, the control circuit 70 receiving this output signal controls the copying machine main body control system 81 to the double-sided copy operation state. As a result, the intermediate tray 24
The rear end regulating plate 24a moves from the X position to the Y position,
The one-sided copy paper stored in the intermediate tray 24 is forward, that is,
The sheet is pushed to the refeed roller 25 side. Then, the re-feeding roller 25 rotates as required, and the intermediate tray 2 in the copying machine body B is rotated.
4, the lowermost single-sided copy paper (the copy paper on which the image of the second original is already copied from the lowermost of the original in the first cycle) is supplied to the front side, and the copy paper fifth path Vb is supplied.
And the register roller 2 passing through the sixth path VIb of the copy paper.
It is sent to 0, 20a.

Similar to the first cycle, the toner image of the original document on the platen glass 12 is formed on the photosensitive drum 16, and this toner image is transferred to the single-sided copy paper sent via the register rollers 20 and 20a. It is transcribed via 14d. After this, the separation charger 14e and the copy paper second passage II
After b, the double-sided copy paper is fixed on the fixing rollers 22 and 22a and double-sided copied (106). Here, since the passage switching device 34 is in the second state indicated by the alternate long and short dash line,
The double-sided copy paper that has passed through the fixing rollers 22 and 22a passes through the copy paper third path IIIb, and the switchback mechanism 2
3 is sent to the copy paper fourth path IVb.

When the rear end of the double-sided copy paper is detected by the photodetector 32 ', the switchback mechanism 23 is switched as shown in the figure. That is, the drive roller 23a rotating in the counterclockwise direction and the roller above the roller abut each other, and the roller on the left side and the roller are separated from each other. At this time, the passage switching device 34
Is switched from the second state to the first state shown by the broken line and the third copy paper path IIIb is closed, so that the double-sided copy paper sent to the path switching unit 34 by the switchback mechanism 23 is the copy paper fourth path. Passage IVb to copy paper 7th passage
After passing through VIIb, the paper is discharged to the paper discharge tray 27 by the paper discharge rollers 26 and 26a. Thereafter, in the next copying process, the passage switch 34 is switched to the second state and the switchback mechanism is switched to the opposite side. This is because double-sided copy paper is discharged to the paper discharge tray 27 in page order.

On the other hand, in the same manner as described above, the original document on the platen glass 12 is ejected onto the original document table 1 by the ejection rollers 11 and 11a after passing through the original document seventh passage VIIa and the original document sixth passage.

Next, the second original from the lowermost part is conveyed onto the platen glass 12 as described above, but at this time, the copying machine main body B is not interlocked. The above operation is repeated for the number of originals placed on the original placing table 1, and a one-sided double-sided copy of one set is placed on the discharge tray 27 in the order of pages (10
7).

In order to detect the completion of the document feeding in the second cycle, the control circuit 70 counts the pulses from the photodetector 28 in the second cycle to detect the comparison with the count value in the first cycle. You may do, or light sensor 4
It may be a detection signal from the intermediate tray 24, and since the single-sided copy paper on the intermediate tray 24 is all supplied, when the photodetector 33 supplies the last-sided single-sided copy paper on the intermediate tray 24, This may be done by detecting the rear end.

On the other hand, at the time of feeding the original in the second cycle, when the output of the T-flip flop 77 is at the "high" level instead of the "low" level as described above, that is, in the odd number mode (10
4), in the same manner as in the even-numbered sheet mode, the copying machine body B interlocks with the odd-numbered originals 1, 3, 5 ... Do. In addition,
Before starting the second cycle of document feeding, one pulse is applied from the control circuit 70 to the T-flip flop 77,
The Q output of the T-flipflop is set to a "high" level condition.

When the first original from the bottom is placed on the platen glass 12 through the first original passage Ia and the second original passage IIa by the circulating sheet original feeding device A in the same manner as described above (108), T In the flip-flop output state, one pulse is input from the photodetector 28, so that the output state is the "high" level. Therefore, the control circuit 70 receiving this output signal causes the copier body control system to receive the output signal. 81 to control the operation state of single-sided copying.

That is, the first document from the bottom of the document is fed by the cassette 1
The copy paper sent from the No. 8 is copied on one side by the copying process (109) and is discharged to the paper discharge tray 27 (110). Of course, at this time, the path switching unit 34 is in the first state shown by the broken line, the copy paper third path IIIb is closed, and the copy paper eighth path VIIIb is open, so that it passes through the fixing rollers 22 and 22a. The one-sided copy passes through the copy paper eighth passage VIIIb as it is, and the discharge rollers 26, 26a.
Is discharged to the discharge tray 27.

After copying, this manuscript will be in the same way as the above, manuscript 7th passage VII
a and the sixth document passage VIa, and the discharge rollers 11 and 11
It is returned to the current top of the original on the original table 1 by a.

Next, the second original from the lowermost part is conveyed onto the platen glass 12 as described above, but at this time, the copying machine B is not interlocked. That is, when the document is fed, the photodetector 28 gives one pulse to the T-flip flop 77, and its Q output becomes "high" level, and the control circuit 70 receiving this signal causes the control circuit 70 to input the signal. To the non-copy state. At the same time, the original on the platen glass 12 passes through the original 7th passage VIIa and the original 6th passage VIa by the reverse rotation of the conveyor belt drive roller, and is ejected onto the original placing table 1 by the discharge rollers 11 and 11a. Returned to the current top of the manuscript.

Next, the third original from the lowermost part is conveyed on the platen glass 12 through the first original passage Ia and the second original passage IIa and set in the copy area (11).
1). At this time, since the output state of the T-flip flop 77 is "high" level, the control circuit 70 which receives this output signal controls the copying machine main body control system 81 to the double-sided copy operation state. As a result, the intermediate tray 2
The trailing edge regulating plate 24a of 4 moves from the X position to the Y position, and the single-sided copy paper stored in the intermediate tray 24 is pushed forward, that is, toward the re-feed roller 25 side. Then, the re-feeding roller 25 rotates as required, and the single-sided copy paper at the bottom of the intermediate tray 24 in the main body B of the copying machine (the first side is already on the front side).
In the cycle, the copy paper on which the second copy of the original is copied is fed from the bottom of the original, and passes through the copy paper fifth path Vb and the copy paper sixth path VIb to register roller 2
It is sent to 0, 20a.

Similar to the first cycle, the toner image of the original document on the platen glass 12 is formed on the photosensitive drum 16, and the toner image is sent through the register rollers 20 and 20a to the non-copy surface of the single-sided copy paper. Is transferred to the sheet via the transfer charger 14d. After this, it passes through the separation charger 14e and the second path IIb of the copy paper, and is fixed on the fixing rollers 22 and 22a to be double-sided copy paper which is double-sided copied (112).
The double-sided copy paper passes through the copy paper eighth passage VIIIb and is discharged to the paper discharge tray 27 by the paper discharge rollers 26 and 26a (113). On the other hand, the document is similarly discharged.

After that, the same operation as that of the second sheet from the bottom of the original is performed on the sheets of the fourth, sixth, ... For the first document, the same operation as the above third document is performed from the bottom of the document (111, 112, 113) to complete the second cycle of document feeding. At the time when this document feeding is completed, the explanation is omitted because it is the same as in the even-numbered sheet mode.

In this way, the copy paper is discharged onto the paper discharge tray 27 in page order. The method of detecting the completion of the document feeding in the second cycle may be the same as the method described in the even-numbered sheet mode. FIG. 7 shows that an odd-numbered original from the bottom of the original is first copied on one side, and then a single-sided copy is made by a flow chart when moving to double-sided copying etc. When the number of sheets is in the even-numbered sheet mode, the double-sided copy switch mechanism 23 is not used, and the sheet is discharged from the fixing rollers 22 and 22a through the eighth sheet VIIIb of the copy sheet to the sheet discharge tray 27 by the sheet discharge rollers 26 and 26a. In the odd-numbered-sheet mode, a single-sided copy sheet obtained by copying one side of the first sheet from the bottom of the original sheet is copied from the intermediate tray 24 to the copy sheet sixth passage VIb and an empty scan copying process, and then to the copy sheet second passage IIb. And is reversed by the switchback mechanism 23 so that the copy surface is the upper surface and the paper is discharged to the paper discharge tray 27. After this, the single-sided copy paper on the intermediate tray 24 is double-sided copied and then reversed using the switchback mechanism 23 in the same manner as described above to discharge the paper.
The paper is discharged to 7. Other processes are omitted because they are obvious from the above operation.

8 to 1 in order to make the above embodiment more understandable
A simplified schematic diagram is shown in FIG. FIG. 8 shows an even number of originals stacked on the original placing table 1, and FIG. 9 shows an even number of originals, both of which are 2, 4 from the bottom of the original.
A copying method is illustrated in which the even-numbered original document is first copied on one side, and then the second cycle document feeding is performed to shift to double-sided copying. FIG. 10 shows an even number of originals stacked on the original placing table 1, and FIG. 11 shows an odd number of originals, which are 1, 3 ... The figure shows a copying method in which an original is firstly copied on one side and then transferred to double-sided copying or the like by feeding the original in the second cycle. In FIG. 8 to FIG. 11, the number of the original document on the original table 1 indicates the number of stacked original documents from the bottom, and is marked on the side with the original image. The number printed on the copy paper is the copy of the original image corresponding to the original number on the copy paper. It should be noted that these copying methods are obvious from the description of the above-mentioned embodiment, and the description thereof will be omitted.

If you need two or more copies, you can use the output tray 27
Instead of, a sorter (paper classifier) is placed. Since the information on the required number of copies is input and stored in advance in the control circuit 70 before the copy command by means (not shown), the original scanning optical system 13 performs the required number of times on the original set on the platen glass. Scan to obtain the required number of single-sided or double-sided copies. When ejecting the required number of copies after copying, the sorting operation is performed only by the sorter, and the other operations are obvious from the above-described embodiment, and the description thereof will be omitted.

In the above embodiment, it is determined whether the even mode is the odd mode based on the output state of the T-flip flop, but the control circuit 70 inputs the pulse from the photodetector 28 as it is without using the T-flip flop and counts it for one cycle. It may be possible to determine whether the mode is the even mode or the odd mode when the feeding of the original document is completed.

As described above, as described in the copying method of the present invention, even if the number of originals is not input, double-sided copying is performed and the sheets are ejected in the order of pages for each number of copies. Therefore, continue copying in that state. Can read. Further, since the number of sheets is counted in the first cycle of feeding the original, it is not necessary to count the original by another means before the original is fed, and there is no pain in the original, which helps to reduce the cost of the apparatus.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of a copying apparatus for explaining a copying method according to the present invention, and FIGS. 2 and 3 are a top view and a side view of a document separating section of the apparatus shown in FIG. , FIG. 4 is a simplified diagram of the drive system of the apparatus shown in FIG. 1, FIG. 5 is a block diagram of the control system of the apparatus shown in FIG. 1, and FIGS. 6 and 7 are reproductions according to the present invention. FIG. 8 is a diagram showing a flow chart for explaining each embodiment of the method, FIGS. 8 and 9 are diagrams showing a flow of a simple apparatus along the flow chart shown in FIG. 6,
FIG. 10 and FIG. 11 are drawings showing the flow of a simple apparatus along the flow chart shown in FIG. 1: Document Placement Table 2: Feeding Roller 3: Feeding Belt 7: Conveying Belt Driving Roller 8: Conveying Belt 12: Platen Glass 13: Original Scanning Optical System 16: Photosensitive Drum 18: Paper Feed Cassette 22, 22a: Fixing Roller 23: Switch back mechanism 24: Intermediate tray 27: Paper discharge tray 11 ', 28, 32: Photodetector 34: Passage switch 47: Optical sensor 50: Motor 60, 61: Clutch 70: Control circuit 77: T-flip flap 81 : Copier body control system

Claims (8)

[Claims] 1. A sheet-type original is fed one by one onto the original platen from the bottom of a large number of single-sided sheets placed on an original placing table on a circulating sheet automatic document feeder, and copied onto a copy sheet. In the double-sided copy control method using a single-sided original, the sheet originals supplied on the original platen are sequentially transferred to the second, fourth, and sixth sheets from the bottom when the original is circulated.
Every other sheet is read and copied on one side of each copy sheet, and at the same time, the number of originals is judged whether it is an even number or an odd number, and when the number is even, promptly Next, the sheet originals are circulated and supplied, and the sheet originals that have been supplied onto the original platen but have not been copied during one circulation of the originals are sequentially read and copied on the other side of the copy paper, respectively. When the number of sheets is odd, the image of the first original is copied from the bottom to the other side of the new copy paper during the next circulation, and the other side is sent to the paper discharge tray with the margin left, A double-sided copy control method using a single-sided original, characterized in that the sheet originals are read by performing the same operation as when they are even-numbered sheets, copied on the other side of each copy sheet, and stacked in page order on the discharge tray. . 2. When circulating a document for reading,
Documents should be guided from the stack position to the reading position with the front and back reversed, then ejected from the same side that was guided to the reading position and returned to the stack position with the front and back reversed again. Claim 1 characterized by
A method for controlling double-sided copying using a single-sided document described in the paragraph. 3. A T-flip-flop whose output is switched each time a document passes, and the T-flip-flop, which is an odd-numbered even-number determination unit.
The double-sided copy control method according to claim 1, further comprising a control circuit for detecting an output state of the flip-flop. 4. A double-sided copy control method using a single-sided original document according to claim 1, wherein the odd-numbered and even-numbered original number determining means includes a counter. 5. A sheet-type original is supplied one by one onto the original platen from the bottom of a large number of single-sided sheets placed on an original placing table on a circulating type sheet automatic feeder, and copied onto copy paper. In the double-sided copy control method using a single-sided original, the sheet originals supplied on the original platen are sequentially transferred to the first, third, and fifth sheets from the bottom when the original is circulated.
Every other sheet is read and copied on one side of each copy sheet, and at the same time, the number of originals is judged whether it is an even number or an odd number, and when the number is even, promptly Next, the sheet originals are circulated and supplied, and the sheet originals that have been supplied onto the original platen but have not been copied during one circulation of the originals are sequentially read and copied on the other side of the copy paper, respectively. When the odd number of sheets, when the next circulation is performed, the image of the first original is copied from the bottom to the other side, and the other side of the copy paper is sent to the discharge tray with a blank space, and the other pages are printed. A double-sided copy control method using a single-sided original, characterized in that the sheet originals are read by performing the same operation as when they are even-numbered sheets, copied on the other side of each copy sheet, and stacked in page order on the discharge tray. 6. When circulating a document for reading,
Documents should be guided from the stack position to the reading position with the front and back reversed, then ejected from the same side that was guided to the reading position and returned to the stack position with the front and back reversed again. Claim 5 characterized by
A method for controlling double-sided copying using a single-sided document described in the paragraph. 7. A T-flip-flop whose output is switched each time a document passes, and the T-flip-flop, which is an odd-numbered even-number determination unit.
The double-sided copy control method according to claim 5, further comprising a control circuit for detecting an output state of the flip-flop. 8. A double-sided copy control method using a single-sided original document according to claim 5, wherein the odd-numbered and even-numbered original number determining means includes a counter.