JPH0241419B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-sided recording device, and more particularly to a double-sided recording device that can record not only on one side of recording paper but also on both sides of recording paper.

Various types of double-sided recording devices that record on both sides of recording paper have been proposed, but especially in the case of the inkjet method or thermal recording method, there is a method to prevent ink bleeding during double-sided recording. It is necessary to use specially treated double-sided recording paper.
Because such double-sided recording paper is specially treated,
It is considerably more expensive than plain paper that uses single-sided recording paper. However, since the above-mentioned double-sided recording device does not have a means to distinguish between single-sided recording paper and double-sided recording paper, it is necessary to use expensive double-sided recording paper even for single-sided recording, resulting in running costs. was rising.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide a double-sided recording device that can selectively use single-sided recording paper and double-sided recording paper.

The present invention provides a double-sided recording device that can perform single-sided recording in addition to double-sided recording paper, which can shorten the conveyance path of the recording paper, perform single-sided recording at high speed, and produce high-quality recorded images. The present invention aims to provide a compact double-sided recording device.

The present invention also provides a double-sided recording device that records on both sides of recording paper using an inkjet recording method, and in particular, high-speed recording when performing double-sided recording mode and single-sided recording mode, miniaturization of the device, and stability of images after recording. The purpose of the present invention is to provide a new double-sided recording device that takes into account the characteristics of the user.

The present invention achieves the above object, and includes a conveyance path for conveying recording paper, and a first recording medium for recording at a first recording position on the first surface of the recording paper conveyed on the conveyance path.
an inkjet recording means, and a second inkjet recording means for recording at a second recording position on the second surface of the recording paper conveyed to the conveyance path,
The first recording position is located above the second recording position with respect to the conveyance direction, and the recording paper conveyance path switching means provided between the first and second recording positions, 1. A double-sided recording mode in which the recording paper on which double-sided recording is performed by the second inkjet recording means is a specially treated recording paper for double-sided recording, and one-sided recording is performed by the first inkjet recording means. The recording paper is a single-sided recording paper different from the double-sided recording paper,
A single-sided recording mode in which the recording paper on which one-sided recording is carried is conveyed and stored so that the next recording paper on which one-sided recording is deposited on the recorded side, switching between the double-sided recording mode and the single-sided recording mode, and the recording mode. This double-sided recording apparatus is characterized by comprising: a control means for controlling switching of the recording paper conveyance path by the switching means according to the above-mentioned switching means.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows the internal structure of a double-sided recording apparatus showing one embodiment of the present invention, and first, the reading means shown in the upper part of the drawing will be explained. In the figure, 1 is a sheet-like original, and 2, 3, 4, 5, 6, and 7 are reversible feeding rollers that feed the original 1. Reference numeral 8 denotes a document feeding table, and 9 a lower surface reading platen provided on the document feeding locus.The lower surface of the document 1 is read at position A of this platen 9. Reference numeral 10 denotes a top surface reading platen provided on the document feeding trajectory, and reads the top surface of the document 1 at position B of this platen 10. 11,1
Reference numeral 2 denotes a document feeding guide, which functions to bring the document 1 into a well-focused image. 13, 14, 15 are photocoupler light emitting elements that detect the position of the original; 16, 1
Numerals 7 and 18 are photocoupler light-receiving elements, and 19 is a document tray that stores the document 1 that has been read.
Reference numeral 20 denotes a document bottom side reading unit, which is installed below the bottom side reading platen 9. Reference numeral 21 denotes a document top surface reading unit placed above the top surface reading platen 10. 2
2 and 23 are document illumination lamps, 24 and 25 are folding mirrors, and 26 and 27 are imaging lenses. 28, 29
is a one-dimensional image sensor consisting of a large number of light-receiving elements arranged one-dimensionally, and in this example, a CCD line image sensor is used. Such an image sensor 2
Reference numerals 8 and 29 convert the incident image light into an electrical signal, electrically process the electrical signal in a processing circuit (not shown), and record it on recording paper by a recording means to be described later.

The reading operation will be explained. When the sheet-like original 1 is inserted toward the feeding rollers 2, 3, the insertion of the original 1 is detected by a photocoupler consisting of a light emitting element 13 and a light receiving element 16, and the feeding rollers 2, 3,
Rotations 4, 5, 6, and 7 begin. The document 1 is fed in the direction of the arrow while being held between the feed rollers 2 and 3, and is passed between the bottom reading platen 9 and the document feed guide 11.
enter between. At this time, the leading edge of the document 1 is detected by a photocoupler consisting of a light emitting element 14 and a light receiving element 17, and the detection output is used as a synchronization signal during recording, which will be described later. First, the original is scanned at the bottom reading position A of the bottom reading platen 9 provided on the original feeding trajectory.
The bottom surface of the image is read by the reading unit 20. Next, the document 1 is transferred to the platen 1 by the feeding rollers 4 and 5.
0 and the guide 12, and the upper surface of the original 1 is read by the reading unit 21 at the upper surface reading position B of the upper surface reading platen 10. After the document 1 is further fed and both sides of the top and bottom surfaces are read, a photocoupler consisting of a light emitting element 15 and a light receiving element 18 detects the trailing edge of the document 1. Here, when reading and scanning the original 1 only once, the original 1 is ejected to the original tray 19 as is.

However, if multiple reading scans are requested for the document 1, the outputs of the photocouplers 15 and 18 reverse the feed rollers 2, 3, 4, 5, 6, and 7, and move the feed path in the opposite direction. Move original 1 to . Here, at reading positions B and A, the images on the original 1 are read by the reading units 20 and 21 in the order of the upper surface and the lower surface. After the above double reading is completed, the photocoupler 1
4, 17 detect the trailing edge of the document 1 in the moving direction, the feeding rollers 2, 3, 4, 5, 6,
7 starts normal rotation. As described above, the feeding rollers 2, 3, 4, 5, 6, and 7 repeat forward and reverse rotations depending on the number of reading scans, and finally discharge the original 1 onto the original tray 19. The original 1 is always discharged onto the original tray 19 regardless of whether the number of readings is an even number or an odd number.

Next, the reading units 20 and 21 will be explained. The lower surface reading unit 20 irradiates the document image at the reading position A with a lamp 22, and sends the reflected light to the CCD line through an optical path composed of a mirror 24 and a lens 26. Image sensor 2
8. The image sensor 28 obtains time-series image signals according to the incident light energy. The operation of the top surface reading unit 21 is also exactly the same as described above.

Next, a recording means that performs recording using the image signal from the above-mentioned reading means will be explained.

In the figure, 50 is a double-sided recording paper; 51 is a double-sided recording paper cassette that stores the recording paper 50;
Reference numeral 2 denotes a single-sided recording paper, 53 a single-sided recording paper cassette containing the recording paper 52, 54 a paper feed roller that feeds the double-sided recording paper 50, and 55 a paper feeder that feeds the single-sided recording paper 52. Rollers 56, 57 are registration rollers, and photocouplers 14, 17 or 1
It is rotated in synchronization with the detection signals No. 5 and 18 to align the image recording position. 58, 59, 60, 6
1, 62, 63, 64, 65, 67, 68, 6
9, 70, 71, 72 are conveyance rollers that convey the recording paper 50 or 52; 73, 74, 75, 7;
6,77,78,79,80,81,82,8
3, 84, 85, 86 are conveyance guides for smooth feeding of the recording paper 50 or 52; 87, 88, 89;
is a conveyor belt serving as a means for conveying the recording paper 50 or 52.

Reference numeral 90 denotes a single-sided paper output tray that stores the single-sided recording paper 52 after recording, and 91 indicates a double-sided recording paper 50 recorded by forward scanning in the forward direction (in the direction of the arrow in the figure).
92 is a second double-sided paper output tray that stores the double-sided recording paper 50 recorded by double-sided scanning in the reverse direction. Inkjet recording heads 93 and 94 form reproduced images corresponding to the output image signals of the CCD line image sensors 28 and 29 on the recording paper 50 or 52. The recording heads 93 and 94 are, for example, so-called full multi-heads arranged in a full line in a direction substantially perpendicular to the conveyance direction of the recording paper 50 or 52. Reference numerals 95 and 96 indicate suction fans (suction means), and reference numerals 97 and 98 indicate porous guide plates.
The flatness of 2 is maintained, and the distance between the recording paper 50 or 52 and the recording head 93 or 94 is maintained as best as possible. 9
Reference numerals 9 and 100 denote conveyance path switching claws (selector fingers) for switching the conveyance paths to the above-mentioned trays 90, 91, and 92, and 101 denotes a housing that houses the above-mentioned reading means and recording means.

The recording operation of the recording apparatus configured in this way will be explained. First, in the case of double-sided recording, when the operator presses a selection key (not shown) to instruct double-sided recording, the lower switching claw 99 moves to the position shown by the broken line in the figure. When the photocouplers 13 and 16 detect the insertion of the original 1,
The paper feed roller 54 and transport rollers 58, 59 rotate, and the double-sided recording paper 50 is transported from the cassette 51 along guides 73, 74, 75, 76 to registration rollers 56, 57. Photocoupler 14,1
7 detects the leading edge of the original 1, the registration rollers 56, 57 rotate in synchronization with the detection signal, and the recording paper 50 is conveyed between the guide plate 97 and the guides 81, 82. Here, in the recording device C,
The recording head 93 driven by the image signal output from the image sensor 28 for reading the lower surface reproduces and records the image of the lower surface of the document on the first side of the recording paper 50 .

At this time, the porous guide plate 9 is
Since the recording paper 50 is sucked through the recording paper 7, the flatness of the recording paper 50 at the recording position is maintained, and the distance between the recording head 93 and the recording paper 50 is also kept constant. The recording paper 50 is further conveyed by conveying rollers 62,
63, and the recording position D is reached. Position D
In this case, the recording head 94 is driven by the image signal output from the top surface reading image sensor 29.
As a result, the upper surface image of the original is reproduced and recorded on the second surface of the recording paper 50. Here, the reading position A of the reading device,
The distance between recording devices B and the distance between recording devices C and D are set to be equal. Therefore, each image sensor 28,
No memory is required to temporarily store the 29 image signal outputs.

At this time, when image reading is forward scanning in the forward direction shown by the arrow in the figure, that is, when the document 1 is fed and read in the direction of the arrow in the figure, the second switching claw 100 is moved to the solid line position in the figure. Therefore, the recording paper 50 on which recording has been performed on the first and second sides is transferred along the conveyor belt 88 and the bent guide 85 to the first duplex paper output tray 91 with the second side facing up. Discharge.

The above is the operation of the recording apparatus when the reading means reads the document 1 forward. Next, in double-sided recording, the operation of the recording means when the reading means performs backward reading will be explained.

During the forward scanning described above, when the leading edge of the document 1 is detected by the photocouplers 15 and 18, the paper feed roller 54 and the conveyance rollers 58 and 59 are rotated to register the second sheet of double-sided recording paper 50. It is conveyed to rollers 56 and 57. When the photocouplers 15 and 18 detect the rear end of the document 1, the paper feed rollers 2, 3, 4, 5, 6, and 7 start rotating in reverse as described above. At the same time, the upper switching pawl 100 moves to the position indicated by the broken line in the figure, and the registration rollers 56 and 5 move in synchronization with the rear end detection signal of the photocouplers 15 and 18.
7 rotates and feeds out the recording paper 50. Recording paper 5
0 records the top image of the original 1 on the first side of the recording paper 50 at the recording position C. Furthermore, recording position D
In this step, an image of the lower surface of the original document 1 is recorded on the second surface of the recording paper 50. That is, the connection relationship between each recording head 93, 94 and each sensor 28, 29 is switched depending on the rear end detection signal of the photocouplers 15, 18 that detect switching from forward reading to backward reading, and the recording head A recording head 93 receives the signal from the sensor 29, and a recording head 94 receives the signal from the sensor 28 to form a reproduced image. Similarly, when switching from backward reading to forward reading, each recording head 93, 94 is activated in response to the leading edge (rear end in the document reading direction) detection signal of the photocouplers 14, 17.
The connection relationship between the sensor 28 and the sensor 29 returns to the initial state described above.

Here, the first side 50 of the recording paper 50 is
-1 and the letter "F" are recorded on the second surface 50-2 as shown in FIG.
On the surface, as shown in Figure 3 a and b, the letter "F",
"E" is recorded upside down. Therefore, when the recording paper 50 during backward scanning is discharged to the first duplex paper output tray (first paper output tray) 91 by the conveyor belt 88 in the same way as during forward scanning, the recording paper 50 is are piled up on the paper discharge tray 91 in different states for each sheet.

Therefore, in this embodiment, the recording paper 50 at the time of backward reading is
When ejecting the recording paper 50, move the upper switching claw to the position indicated by the broken line in the figure to switch the conveyance path and convey the recording paper 50 with another conveyance belt 89. Change the direction of 50 and insert the second duplex paper output tray (second paper output tray).
At 92, the recording paper 50 is discharged with its first side facing upward. With this configuration, the recording paper 50 during forward reading
is discharged onto the first paper discharge tray 91, and the recording paper 50 during backward scanning is discharged onto the second paper discharge tray 92. Therefore, the recording sheets 50 during forward reading and backward reading can be stacked on the respective paper discharge trays 91 and 92 with their directions and surfaces aligned.

Next, when recording only one side is required, the operator can instruct the operator to record one side by pressing the lower switching claw 9.
9 and set it to the position shown by the solid line in the diagram. When the photocouplers 13 and 16 detect the insertion of the original 1,
A paper feed roller 55 and a conveyance roller 60 for single-sided recording,
61 rotates, and the single-sided recording paper 52 is placed in the cassette 53.
It is pulled out and conveyed along guides 77, 78, 79, and 80 to registration rollers 56 and 57.
When the photocouplers 14 and 17 detect the leading edge of the document 1, the registration rollers 5 synchronize with the detection signal.
6 and 57 rotate, and the recording paper 52 is sent out.
At the recording position C, the recording head 93 reproduces and records the lower side image of the document on the first side of the recording paper 52.

Here, the switching claw 99 is provided at the recording position point C, above the transport rollers 62, 63 and the transport belt 87, and the switching claw 99 is set at the position indicated by the solid line in the figure, so that the recording position D direction is closed. Conveyor belt 8
Since seven directions are open, the recording paper 52 on which recording has been performed on only one side (first side) is further transported by the conveyance roller 62,
63, the recording paper 52 is conveyed by the conveyor belt 87.
and a single-sided paper output tray 90 along the guide 83.
The first side is then discharged upward.

In this way, the cassette 51 of the double-sided recording paper 50
and a cassette 53 for one-sided recording paper 52 are provided separately, and the recording paper 50, 5 from each cassette 51, 53 is
Since the two paper feeds are switched as desired, the single-sided recording paper 52 and the double-sided recording paper 50 can be easily used. Therefore, since single-sided recording can be performed using relatively inexpensive single-sided recording paper 52, running costs can be reduced.

In addition, when performing double-sided recording in single-sided recording,
During forward scanning, when the photocouplers 15 and 18 detect the trailing edge of the document 1, the rollers 2 to 7 are reversed, and the second recording paper 52 is fed and registered on the register rollers 56 and 57. This is the same as double-sided recording, but the registration of the recording paper 52 by the registration rollers 56 and 57 is canceled as follows. That is, the registration is canceled after a predetermined period of time has elapsed since the document 1 moves backward and the photocouplers 15 and 18 detect the rear end (the leading edge in the document reading direction) of the document 1. In other words, in the case of single-sided recording, the document is read at position A during the backward movement, so the trailing edge of the document is in front of position A and at a position corresponding to the distance between photocouplers 15 and 18 and position B. When the target is reached, the resist will be canceled.

FIG. 4 is a block diagram showing an example of a control circuit of the double-sided recording apparatus of the present invention shown in FIG. here,
Reference numeral 119 denotes a control circuit, which includes, for example, a one-chip microcomputer that stores a control operation program, and controls various circuits described below using the document detection signals from the single-sided/double-sided recording switch 120 and the light receiving elements 16, 17, and 18. Control. 12
1 is a switching pawl drive circuit, which operates a lower switching pawl 99 and an upper switching pawl 1 according to a control signal from a control circuit 119.
Change the set position of 00. Reference numeral 122 denotes a forward rotation clutch drive circuit, which rotates the original feed rollers 2-7 in the normal direction, and 123, a reverse rotation clutch drive circuit, which rotates the document feed rollers 2-7 in the reverse direction. 124 is a registration roller drive circuit that drives and controls the registration rollers 56 and 57; 125 is a recording paper feed roller 54 and 5;
This is a feeding roller drive circuit that drives and controls the drive roller 5.

Also, 126 is a clock generator, 127, 12
8 is an analog-to-digital converter (A/D converter) that operates in synchronization with the clock generator 126, and the former A/D converter 127 converts the output signal of the image sensor 28 for reading the bottom surface into a binary value. convert it into an image signal, and send the binary signal to a multiplexer 129,
130. The latter A/D converter 128 converts the output signal of the image sensor 29 for top surface reading into 2
It converts into a binary image signal and outputs the binary signal to multiplexers 129 and 130. A head drive circuit 131 drives the recording head 93, and a head drive circuit 132 drives the recording head 94.

To explain the case of double-sided recording, when the reading section is in forward reading mode, the multiplexer 12
9 outputs the input signal from the A/D converter 127 to the head drive circuit 131, and during backward reading,
The output of the A/D converter 128 is connected to the drive circuit 13 described above.
Output to 1. Similarly, the multiplexer 130 receives the input signal from the A/D converter 128 during forward reading, and the input signal from the A/D converter 12 during backward reading.
The input signal from 7 is output to the head drive circuit 132. Further, in the case of single-sided recording, the multiplexer 130 is inactive, and the multiplexer 129 outputs the output of the A/D converter 127 to the drive circuit 131 even during backward reading.

As described above, in this embodiment, the detection means 15 and 18 detect that the reading means for reading the document 1 while moving the document has finished reading the document, and the detection means 1
The feeding direction of the feeding means that feeds the original 1 is reversed in accordance with the outputs 5 and 18. Therefore, there is no need to manually insert the same document into the reading unit many times, which simplifies the operation and enables faster reading operations.

On the other hand, the double-sided recording apparatus of the present invention is not limited to those with a sheet-type reading mechanism as described above, but can be applied to any type of apparatus, such as a book-type original reading mechanism. Further, although a photocoupler consisting of a light emitting element and a light receiving element is used as the detection means, it is of course possible to use other detectors such as other Hall elements or microswitches.

As explained above, according to this embodiment, the cassettes for single-sided recording paper and the cassettes for double-sided recording paper are provided separately, and the cassettes can be switched arbitrarily. You can use paper and double-sided recording paper. Therefore, inexpensive single-sided recording paper can be used for single-sided recording, and running costs can be reduced.

As described above, the single-sided recording paper 52 is stored in a state in which the recorded first side is stacked in order on the recording paper tray 62 with the upper side facing forward, so that the first side is stacked on the recording paper tray 62 immediately after being ejected to the tray. Since there is no inconvenience that the side comes into contact with the tray or the previously stored recording paper, image distortion can be prevented, and there is no need to pass through point D, which is the recording position on the second side, achieving high-speed single-sided recording. can. Furthermore, by using specially treated double-sided recording paper for double-sided recording, and by using single-sided recording paper different from the double-sided recording paper for single-sided recording, paper is wasted. can be improved,
Since the transport path switching means and the control means for performing this switching and mode switching are provided, these can be executed reliably.

As can be understood from the above description, the present invention executes a single-sided recording mode in the first inkjet recording means located relatively upstream in the recording paper conveyance direction, and converts the recording paper to be recorded on one side into a specially treated double-sided recording medium. Since inexpensive recording paper for single-sided recording, which is different from recording paper for recording, can be used, the double-sided recording apparatus as a whole is efficient. Furthermore, in the present invention, the conveyance path set by the conveyance path switching means for single-sided recording prevents the recorded image after single-sided recording from immediately coming into contact with the tray or the previously stored recording paper. The present invention has been able to provide a compact double-sided recording device as a whole, which can produce high-quality images while exhibiting the effect of promoting fixation without disturbing the recorded images, and can also perform high-speed single-sided recording.

[Brief explanation of drawings]

FIG. 1 is an internal configuration diagram of a double-sided recording device showing an example of the present invention, FIGS. FIG. 4 is a diagram showing an example of the recording state of the recording paper during dynamic reading, and FIG. 4 is a block diagram showing an example of the control circuit of the double-sided recording apparatus of FIG. 1...Original, 2-7...Feed roller, 8...Document feed table, 9...Bottom side reading platen, 10...Top side reading platen, 11, 12...Document feed guide, 13-15... Photocoupler light emitting element, 16
〜18...Photocoupler light receiving element, 19...Document tray, 20...Document bottom side reading unit, 21...
...Original top reading unit, 22, 23...Original illumination lamp, 24, 25...Folding mirror, 2
6, 27...imaging lens, 28, 29...CCD
Line image sensor, 50...Double-sided recording paper,
51...Double-sided recording paper cassette, 52...Single-sided recording paper, 53...Single-sided recording paper cassette, 54...
...Double-sided paper feed roller, 55...Single-sided paper feed roller, 56, 57...Registration roller, 58-6
5, 67-72... Conveyance roller, 73-86...
Conveyance guide, 87-89... Conveyance belt, 90...
...Single-sided paper output tray, 91...First double-sided paper output tray, 92...Second double-sided paper output tray, 9
3,94... Inkjet recording head, 95,
96... Suction fan (suction means), 97, 98...
... Porous guide plate, 99, 100 ... Conveyance path switching claw, 101 ... Housing, 119 ... Control circuit, 12
0...Single-sided/double-sided recording switch, 121...
Switching pawl drive circuit, 122... Forward clutch drive circuit, 123... Reverse clutch drive circuit, 124...
... Registration roller drive circuit, 125 ... Paper feed roller drive circuit, 126 ... Clock generator, 12
7,128...A/D converter, 129,130...
...Multiplexer, 131, 132...Head drive circuit.

Claims (1)

[Scope of Claims] 1. A conveyance path for conveying recording paper, a first inkjet recording means for recording at a first recording position on the first side of the recording paper conveyed by the conveyance path, and the conveyance path. and a second inkjet recording means for recording at a second recording position on the second side of the recording paper conveyed, wherein the first recording position is located at the second side with respect to the conveyance direction. It is located above the recording position, and double-sided recording is performed by the recording paper conveyance path switching means provided between the first and second recording positions, and the first and second inkjet recording means. a double-sided recording mode in which the recording paper is specially treated recording paper for double-sided recording; and a double-sided recording mode in which the recording paper on which single-sided recording is performed by the first inkjet recording means is used for single-sided recording different from the recording paper for double-sided recording. Switching between a single-sided recording mode in which recording paper is conveyed and stored so that the next recording paper with single-sided recording is deposited on the recorded side of the recording paper, and the double-sided recording mode and the single-sided recording mode. and a control means for controlling switching of the recording paper conveyance path by the switching means according to the recording mode. 2. The double-sided recording device includes a document conveyance path for conveying the document, a first document reading means for reading the first side of the document conveyed to the document conveyance path at a first reading position, and a document conveyance path for conveying the document to the document conveyance path. The second manuscript to be
a second document reading means for reading the surface at a second reading position located downstream of the first reading position with respect to the document conveyance direction;
The recording paper conveyance distance between the recording position and the second recording position is equal to the document conveyance distance between the first reading position and the second reading position, and The first inkjet recording means performs recording based on a signal, and the second inkjet recording means performs recording based on a signal from the second document reading means.
Double-sided recording device as described in Section. 3 The first and second inkjet recording means are:
The double-sided recording apparatus according to claim 1 or 2, which is a full-line inkjet recording means capable of recording over the maximum recording width of the recording paper.