JP2001083747A - Double-sided image recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double-sided image recording device equipped with a double-sided recording mechanism where trouble concerning the deterioration of an image, device size and the complication of constitution is eliminated. SOLUTION: This device is equipped with a carrying path 100 for carrying recording paper 6, a recording head 9 recording the image by discharging recording liquid to one side of the paper 6 on the path 100, a paper feeding and ejecting tray 12 for ejecting the paper 6 from the path 100, a paper feeding roller 3 for feeding the paper 6 to the path 100 in a state where the 1st side of the paper 6 is set as a recording surface, a paper feeding and carrying roller for feeding the paper 6 on whose 1st side the image is recorded and which is ejected to the tray 12 toward the path 100 again, and a recording paper reversing mechanism 120 reversing and supplying the paper 6 fed again by the paper feeding and carrying roller to the upstream side of the head 9 existing above the path 100 in a state where the 2nd side of the paper 6 is set as the recording surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided image recording apparatus having a double-sided recording function capable of automatically recording an image on both sides of a recording medium.

[0002]

2. Description of the Related Art In a conventional double-sided image recording apparatus, for example, a double-sided recording mechanism in an electrophotographic printer includes a switchback mechanism, a switching mechanism for switching between a plurality of branch paths and a paper conveyance path, and The recording medium recorded on the surface is turned upside down and re-fed to the recording unit.

[0003] For example, a double-sided recording mechanism in an ink jet printer is provided with two print heads for recording on one side of a recording medium, as shown in JP-A-58-56860. There was a way to record.

[0004]

However, when the reversing mechanism such as the above-described switchback method is provided in the apparatus, a series of printing operations are performed at a constant speed.
In particular, when this apparatus is to be provided in an ink jet printer, image deterioration has naturally been inevitable. Further, this method has a problem that the double-sided recording mechanism involves an increase in size.

That is, ink jet printers often use a low-viscosity liquid as the ink. In this case, when the ink adheres to the recording paper, it penetrates, and when the ink is recorded on one side of the recording paper, In other cases, the ink penetrated into the other side of the recording paper by the penetrated ink, and was not suitable for double-sided recording.

In particular, when recording is performed simultaneously on the same location on both sides at once, it goes without saying that a large amount of ink permeates the recording paper, and thus image deterioration appears.

In order to prevent the image quality from being deteriorated due to the penetration,
It is necessary to record on the other side after a lapse of a certain period of time when the recording on the first side dries. In the prior art, in order to solve this problem, there have been many methods of providing a double-sided recording mechanism by providing a recording head at another place on each surface.

However, the above method has a problem that many components are required for a double-sided recording mechanism and a complicated mechanism is required.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object thereof is to provide a double-sided recording mechanism which solves the problem of image deterioration, apparatus size, and complicated configuration. To provide a double-sided image recording apparatus.

[0010]

In order to achieve the above object, the present invention is directed to a recording medium conveying path for conveying a recording medium and a recording medium on one side of the recording medium on the recording medium conveying path. Recording means for discharging a liquid to record an image, a discharge unit for discharging a recording medium from the recording medium transport path, and a first supply for feeding a recording medium to the recording medium transport path with a first surface thereof as a recording surface Paper means, second paper supply means for re-feeding the recording medium on which an image is recorded on the first surface and discharged to a discharge section toward the recording medium transport path, and re-feeding by the second paper supply means Recording medium reversing means for reversing the recording medium to be supplied and supplying the second surface as a recording surface to the upstream side of the recording means on the recording medium transport path.

Since the recording image on the first surface by the recording liquid is dried by being discharged to the discharge section, it is possible to perform double-sided recording on the second surface without the recording liquid permeating the recording medium and deteriorating the image.

Further, as compared with the related art, the number of components in the double-sided recording mechanism can be reduced, and the size of the apparatus can be reduced.

According to a second aspect of the present invention, there is provided a re-feeding start timing control means for controlling a waiting time until re-feeding is performed by the second feeding means.

In the discharge portion of the recording medium on which the recording has been performed on the first surface of the recording medium, the recording liquid landed on the recording medium is allowed to stand for a certain period of time depending on the recording image data size. Are dried, which means that it is also possible to prevent image degradation.

With this function, it is possible to appropriately control the time until the recording liquid adhered to the recording medium is sufficiently dried, to prevent image deterioration, and to record the image on the second sheet feeding means during the recording operation on the second surface. The liquid can be prevented from adhering.

According to a third aspect of the present invention, the waiting time by the refeeding start timing control means is controlled based on the discharge amount of the recording liquid onto the first surface of the recording medium.

In this way, by setting the waiting time based on the discharge amount, any recorded image can be appropriately dried.

According to the fourth aspect of the present invention, the waiting time by the re-feed start timing control means is controlled in consideration of the position information of the recording liquid discharged to the first surface of the recording medium.

If the ratio of the recording liquid discharge amount varies depending on the position of the recording paper, the time required for drying also changes. Thus, by taking the discharge position information into consideration in the waiting time, the recording medium can be dried more efficiently. be able to.

The invention according to claim 5 is characterized in that the discharge amount of the recording liquid is calculated based on the amount of image data recorded on the first surface of the recording medium.

As described above, if the ejection amount of the recording liquid is determined from the actual image data, the ejection amount of the recording liquid can be calculated more accurately.

According to a sixth aspect of the present invention, there is provided a recording medium aligning means for suppressing skew feeding of a recording medium when refeeding is performed by the second paper feeding means.

At the time of recording on the second surface of the recording medium, it is possible to prevent the recording medium from skewing.

[0024] The invention according to claim 7 is characterized in that it has a drying means for drying the recording liquid on the recording medium when recording is performed on the recording medium by the recording means.

In this way, high-speed recording can be realized even when drying is forcibly performed, and furthermore, image deterioration can be prevented.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiment.

[First Embodiment] FIG. 1 is an overall view of a double-sided image recording apparatus according to a first embodiment of the present invention.

This double-sided image recording apparatus includes a recording paper transport path 100 for transporting a recording paper 6 as a recording medium, and a recording means for recording an image on one side of the recording paper 6 on the recording paper transport path 100. A head 9, a discharge unit 110 that discharges the recording paper 6 from the recording paper transport path 100, and a first paper feeding unit that feeds the recording paper 6 to the recording paper transport path 100 with its first surface as a recording surface. Paper feed roller 3 and paper feed / conveyance as second paper supply means for re-feeding recording paper 6 having an image recorded on the first surface and discharged to discharge section 110 toward recording paper conveyance path 100 The roller 8 and the recording paper 6 re-fed by the paper supply / conveyance roller 8 are reversed and the second surface thereof is supplied to the upstream side of the recording head 9 on the recording paper conveyance path 100 as a recording surface. Recording paper reversing mechanism 12 as recording medium reversing means It has a, and.

The recording head 9 is constituted by an ink jet head for recording an image by discharging a recording liquid.

FIG. 2 is a side view of the paper feeding unit and the recording unit of FIG. The paper feed / recording mechanism in FIG. 2 is a mechanism that has existed conventionally, and in the present invention, the recording operation on the first surface of the recording paper utilizes this mechanism. The principle is described below.

The paper feed section is provided with paper feed tray plates 1-a and 1-b.
Are connected to each other.
b serves as a pressure plate for pressing the recording paper 6 against the paper feed roller 3. The paper feed tray plate 1-b is a place where a plurality of recording papers 6 can be supplemented.

Further, a separation pad 4 is provided opposite to the paper feed roller 3, and a spring 5 is connected to the separation pad 4, whereby the separation pad 4 is operated. It is assumed that a plurality of recording papers 6 are supplemented on the paper feed tray plate 1-b. When a recording command is issued, the paper feed tray plate 1-b is urged by the spring 2, and the paper feed roller 3 is pressed against the recording paper 6 on the paper feed tray plate 1-b. Is rotated, the uppermost recording sheet 6 of the plurality of recording sheets is separated and conveyed by the action of the separation pad 4 urged by the spring 5.

The separated and conveyed recording paper 6 is conveyed to a recording head 9 along a recording paper conveyance path 100. In order to convey the recording paper 6, the recording paper 6 may be pressed against the paper feeding / conveying roller 8 and the conveying roller 7 which are opposed to each other. That is, 2
The recording paper 6 is sandwiched between the two paper feeding / conveying rollers 8 and the conveying roller 7, and the separated recording paper 6 is conveyed to the recording head 9 by rotating the rollers.

When the transported recording paper 6 reaches the recording head 9, the recording head 9 performs a recording operation.
The recording paper 6 on which the recording operation has been performed is conveyed by contact between the conveying roller 11 and the spur 10.

With the above operation, recording on the first side of the recording paper 6 becomes possible.

FIGS. 3 and 4 are simplified side views of the discharge unit 100 of FIG.

The discharge unit 100 includes a supply / discharge tray 1
2 is provided, and a spring 1 is
3 and 14 are connected.

As shown in FIG. 3 and FIG. 4, the recording paper 6 on which the recording operation has been performed and which has been conveyed earlier is fed to the supply / discharge tray 12.
And is loaded on top of it.

FIG. 5 shows the paper supply / discharge tray 12 shown in FIGS.
FIG. The paper supply / discharge tray 12 has a discharge unit for recording paper 6 on which the first surface is recorded, a paper supply unit for recording on the second surface of the recording paper, and a recording unit that has completed a series of operations in response to a recording command. It has the function of a paper discharge unit. Further, the supply / discharge tray 12 is provided with a recording paper alignment mechanism 15 as a recording medium alignment means in FIG.

The recording paper alignment mechanism 15 can be operated left and right, so that various recording paper sizes can be set for recording the second side of the recording paper 6. By adjusting the size of the recording paper alignment mechanism 15 in advance to the size of the recording paper 6, the recording paper 6 is placed on the supply / discharge tray 12 and the side of the recording paper alignment mechanism 15 and the supply / discharge tray 12. It is loaded in a state sandwiched between. This prevents the recording paper 6 from skewing.

Further, the function of leaving / re-feeding the sheet in the supply / discharge tray 12 for a certain period of time according to the algorithm of FIGS. It has control means.
The refeed timing control means is constituted by a computer, not shown.

With this function, the recording liquid that has landed on the recording paper 6 is dried to prevent image deterioration, and that the recording liquid adheres to the paper feed / conveyance roller 8 during the recording operation on the second surface. Prevention can also be realized.

Here, the printing procedure will be described in detail with reference to the flowchart of FIG.

First, when a print command is issued (S1), it is determined whether the printing is single-sided printing or double-sided printing (S2).

In the case of single-sided printing, recording paper feeding by the paper feed roller 3 is started (S3), printing is performed by the recording head 9 (S4), and after the printing is completed, the recording paper is fed to the supply / discharge tray 12 (S12). (S5). Subsequently, it is determined whether or not to continue printing (S6).
1 and ends if printing is not continued (S
7).

On the other hand, in the case of double-sided printing,
(S8), and the recording head 9 prints the first surface (front surface) of the recording paper 6 (S8).
9) After completion of printing, the recording paper is discharged to the supply / discharge tray 12 (S10). Then, the procedure proceeds to the data analysis procedure (S1).
1). The data analysis is performed according to the procedure of the algorithm of FIGS. 11 to 13 described later (FIGS. 11 to 13 show one flowchart). When the data analysis is completed, the feed / discharge tray 12 is operated (S13),
Feeding of the recording paper 6 by the transport roller 8 is started (S1).
4). Then, the recording head 9 prints the second side (back side) of the recording paper 6 (S15), and the recording paper 6 is discharged again to the supply / discharge tray 12 (S16), and it is determined whether to continue printing. Is performed (S16). When printing is continued, the process returns to S1, and when printing is not continued, the process ends (S7).

In the recording operation, if the discharge amount of the recording liquid is small, the recording liquid on the recording paper is immediately dried. However, the longer the recording liquid ejection amount, the longer it takes to dry. In addition, if the ratio of the recording liquid ejection amount differs depending on the position of the recording paper 6, such as the front surface 6a, the middle surface 6b, and the rear surface 6c of the recording paper 6 in FIG.

When a print command is issued, as shown in FIGS. 11 to 13, the ratio of the recording liquid ejection amount per page is first calculated from the image data. The ratio is 0-30%,
A waiting time (WAIT) for the recording liquid ejection ratio with respect to the position of the recording paper 6 is executed for each ratio.

For example, the ratio of the recording liquid discharge amount per page is 30%, and the discharge ratio to the position of the recording paper 6 is 33% (front, middle, and rear is the same for each of the front, middle, and rear (see FIG. 14). Ratio). Then W
AIT1 (WAIT A), WAIT4 (WAIT
B), WAIT7 (WAIT C) is selected, and the sum of them is the actual waiting time (WAIT1 + WAIT1).
4 + WAIT7).

The ratio of the recording liquid discharge amount per page is 30%, and the discharge ratio with respect to the position of the recording paper 6 is
Suppose the middle, later, 80%, 20%, 0%. Then W
AIT2, WAIT3, and WAIT6 are selected, and the time obtained by adding them is the actual waiting time (WAIT).

Similarly, when the ratio of the recording liquid ejection amount per page is 31-69%, the flow proceeds to the middle stage, and when the ratio is 70-100%, the flow proceeds to the lower stage. (WAIT) is executed.

The length of the waiting time is WAIT0 <WAIT
1 <WAIT2 <‥ ‥ · <WAIT25 <WAIT2
The order is 6.

FIG. 6 is a simplified side view of the supply / discharge tray 12 of FIG. When the recording operation on the first side of the recording paper 6 is performed and the conveyed recording paper 6 reaches the supply / discharge tray 12, the refeeding start timing control means controls the timing of starting refeeding. And then spring 1
By operation of the trays 3 and 14, the feed / discharge tray 1 as shown in FIG.
The recording paper 6 reaches the support plate 16 with the inclination of 2.

FIGS. 7, 8, and 9 are side views of the recording paper reversing mechanism 120 of FIG. When the rear end of the recording paper 6 reaches the support plate 16, the supply / discharge tray 12 is urged by the operation of the springs 13 and 14, and the supply / discharge tray 12 is shifted from the inclined state as shown in FIG. The state changes to a parallel state, and it plays the role of a pressure plate.

Then, the recording paper 6 on the paper supply / discharge tray 12 is pressed by the paper supply / conveyance roller 8 serving as the second paper supply means, which has previously functioned as the conveyance roller, and the roller is rotated in this state. , The separation pad 17 urged by the spring 18
Conveys the recording paper 6. The recording paper 6 transported by the paper feed / transport roller 8 and the separation pad 17 is transported by the transport guide
9 reaches the transport roller 21 at the end. The recording paper 6 is conveyed to the conveyance guide 20 by pressing the paper supply / discharge roller 8 and the conveyance roller 21 against each other. The recording paper 6 reaches the transport roller 7 by the transport guide 20 as it is, and the second contact of the recording paper 6 is performed by pressing the paper feed / transport roller 8 and the transport roller 7.
The surface reaches the recording head 9.

A series of these operations is a reversing operation, and the recording paper 6 on which the reversing operation has been performed is recorded on the second surface of the recording paper 6 by the recording head 9, and thereafter, the first surface of the recording paper 6. Spur 10 and transport roller 1
1, the recording paper 6 is conveyed, and the recording paper 6 reversely recorded on the supply / discharge tray plate 12 is discharged.

When the recording paper is conveyed and the recording head 9 starts operating during recording on the second side of the recording paper 6, the supply / discharge tray 12 is lowered by springs 13, 14 as shown in FIG. Descend to As a result, even if the recording sheets already recorded on the supply / discharge tray 12 are ejected, the recording operation of only the target recording sheet can be performed without involving them.

By the above operation, recording on the second side of the recording paper 6 becomes possible, and double-sided recording on the recording paper 6 becomes possible. Of course, a plurality of sheets can be recorded.

[Second Embodiment] FIG. 15 is an overall view of a second embodiment of the present invention. In the following description, points different from the first embodiment will be described.
The same components are denoted by the same reference numerals and description thereof will be omitted.

FIG. 16 is a detailed view of the air injection device of the present invention. 22 is an air injection device as a drying means,
It is arranged downstream of the transport roller 11. Reference numeral 22-a denotes a blowing section of the air injection device.
2-a, a fan 22-b of an air injection device is provided, and a blowout port 2 is provided at a lower end of the blowout portion 22-a.
2-c is open, and the air generated from the fan 22-b is directed to the outlet 22-c,
Air is blown in the direction of the arrow from -c.

The fan 22-b has a propeller-like shape, and generates air by rotating. The blowout portion 22-a has a shape that shrinks toward the blowout port 22-c, thereby increasing the flow rate of the air generated by the fan 22-b.

The paper feeding operation is the same as that in the first embodiment, and will not be described here. However, the recording head 6 performs a recording operation on the recording paper 6 fed by this operation. Then, air is blown by the operation of the air ejecting device 22 on the recording paper 6 being transported by the contact between the transport roller 11 and the spur 10, and the recording liquid on the recording paper 6 is dried.

The dried recording paper 6 is discharged onto the supply / discharge tray 12, and immediately thereafter, the springs 13 and 14 are operated to tilt the supply / discharge tray as shown in FIG. After the recording paper 6 reaches the support plate 16, the supply and discharge tray 12 is urged by the operation of the springs 13 and 14, and the supply and discharge tray 12 changes from the inclined state to the parallel state, and the role of the pressure plate is achieved. Will be responsible. The subsequent inversion operation is the same as in the first embodiment.

The recording operation is performed by the recording head 9 on the reversed recording paper 6. And the conveying roller 11 and the spur 1
Air is blown onto the recording paper 6 being conveyed by contact with the recording paper 6 by the operation of an air duct, which is the air ejecting device 22, so that the reversed recording liquid on the recording paper 6 is also dried. Thereafter, the recording paper 6 is transferred to the supply / discharge tray 12.
Is discharged to

Needless to say, it is possible to shorten the drying time by installing a heater or changing the air volume in the air injection device 22.

By the above operation, double-sided recording can be performed in a short time without deteriorating the image.

[0067]

As described above, according to the first aspect of the present invention, a recording medium transport path for transporting a recording medium,
A recording unit that discharges a recording liquid onto one surface of the recording medium on the recording medium transport path to record an image, a discharge unit that discharges the recording medium from the recording medium transport path, and a recording medium that is disposed on the recording medium transport path. A first paper feeding means for feeding one surface as a recording surface, and a second paper feeding for re-feeding a recording medium on which an image is recorded on the first surface and discharged to a discharge section toward the recording medium transport path Means, and a recording medium reversing means for reversing the recording medium re-fed by the second paper supply means and supplying the second surface as a recording surface to an upstream side of the recording means on the recording medium transport path. By providing, the recorded image on the first surface by the recording liquid is dried by being discharged to the discharge unit,
The two-sided recording on the second surface became possible without the recording liquid seeping into the recording medium and deteriorating the image.

Further, compared with the conventional double-sided recording mechanism, the number of components in the double-sided recording mechanism can be reduced, the structure is not complicated, and the size can be made relatively smaller than the conventional double-sided recording mechanism.

According to a second aspect of the present invention, there is provided a re-feeding start timing control means for controlling a waiting time until re-feeding is performed by the second feeding means, and the first re-feeding timing control means is provided for one of the recording media.
By performing a leaving operation for a certain period of time depending on the recording image data size in the discharge section of the recording medium that has performed recording on the surface, the recording liquid that has landed on the recording medium is dried, and image deterioration is also prevented. Enable.

With this function, it is possible to appropriately control the time until the recording liquid adhered to the recording medium is sufficiently dried, to prevent image deterioration, and to perform recording on the second paper supply means during the recording operation on the second surface. The liquid can be prevented from adhering.

According to a third aspect of the present invention, the waiting time by the refeeding start timing control means is controlled based on the discharge amount of the recording liquid onto the first surface of the recording medium, so that any recording image can be obtained. But it can be dried properly.

According to the fourth aspect of the present invention, the waiting time by the re-feeding start timing control means is controlled in consideration of the ejection position information of the recording liquid onto the first surface of the recording medium, so that more efficient operation is possible. Then, the recording medium can be dried.

According to the fifth aspect of the present invention, the discharge amount of the recording liquid can be calculated more accurately by calculating the discharge amount of the recording liquid based on the amount of image data recorded on the first surface of the recording medium. .

According to a sixth aspect of the present invention, there is provided a recording medium aligning means for suppressing skew feeding of a recording medium when refeeding is performed by the second paper feeding means. It is possible to prevent skewing of the recording medium during recording.

According to a seventh aspect of the present invention, when the recording medium is forcibly dried by having the drying means for drying the recording liquid on the recording medium when recording is performed on the recording medium by the recording means. However, high-speed recording is realized, and furthermore, prevention of image deterioration can be realized.

As a result, double-sided recording can be performed without the recording liquid seeping into the recording medium and deteriorating the image.

Further, by providing an apparatus for blowing air, such as an air ejecting apparatus, image deterioration can be prevented, and double-sided recording can be performed in a shorter time than the above-described method.

[Brief description of the drawings]

FIG. 1 is an overall view of a double-sided image recording apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a side view showing a sheet feeding / recording unit of FIG. 1;

FIG. 3 is a side view showing a paper discharge mechanism of FIG. 1;

FIG. 4 is a side view showing the paper discharge mechanism of FIG. 1;

FIG. 5 is a detailed view of the supply / discharge tray of FIGS. 3 and 4.

FIG. 6 is a simplified side view of the supply / discharge tray of FIG. 5;

FIG. 7 is a side view showing the sheet re-feeding mechanism of FIG. 1;

FIG. 8 is a side view showing the sheet re-feeding mechanism of FIG.

FIG. 9 is a side view showing the sheet re-feeding mechanism of FIG. 1;

FIG. 10 is a diagram illustrating an algorithm of a printing operation.

FIG. 11 is a diagram illustrating an algorithm of a printing operation.

FIG. 12 is a diagram illustrating an algorithm of a printing operation.

FIG. 13 is a diagram illustrating an algorithm of a printing operation.

FIG. 14 is a supplementary diagram of the algorithm of the printing operation.

FIG. 15 is an overall configuration diagram of a double-sided image recording apparatus according to Embodiment 2 of the present invention.

FIG. 16 is a detailed view of the air injection device of FIG. 15;

FIG. 17 is a simplified side view of the supply / discharge tray of FIG. 15;

FIG. 18 is a side view showing the re-feeding mechanism of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 conveyance path 110 discharge section 120 recording paper reversing mechanism (recording medium reversing means) 1 -a paper feeding tray plate 1 -b paper feeding tray plate 2 spring 3 paper feeding roller (first paper feeding means) 4 separation pad 5 spring 6 Conveyed recording paper 7 Conveying roller 8 Paper feeding / transporting roller (second paper feeding means) 9 Recording head (recording means) 10 Spur 11 Transporting roller 12 Feed / discharge tray 13 Spring 14 Spring 15 Recording medium alignment mechanism 16 Plate 17 Separation pad 18 Spring 19 Transport guide 20 Transport guide 21 Transport roller 22 Air jet device 22-a Air jet device blowout portion 22-b Air jet device fan 22-c Air jet device jet port

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 2C056 EA05 EA23 EC03 EC12 EC33 EC37 HA29 2C058 AB02 AB17 AC07 AE02 AE09 AF04 AF17 AF20 AF25 GA14 2H028 BA06 BA09 BA16 3F053 BA03 BA27 LA01 LB03 3F100 AA02 BA17 CA03 CA00 CA03 CA15

Claims (7)

[Claims] A recording medium conveying path for conveying a recording medium; recording means for discharging a recording liquid onto one surface of the recording medium on the recording medium conveying path to record an image; and recording the recording medium from the recording medium conveying path. A discharge unit for discharging, a first paper feeding unit for feeding a recording medium to the recording medium conveyance path with a first surface thereof as a recording surface, and a recording medium on which an image is recorded on the first surface and discharged to a discharge unit Second paper feeding means for re-feeding the recording medium toward the recording medium transport path, and inverting the recording medium re-fed by the second paper feeding means and setting the second surface thereof as a recording surface to transport the recording medium. A double-sided image recording apparatus, comprising: a recording medium reversing unit that supplies the recording medium upstream of a recording unit on a road. 2. The double-sided image recording apparatus according to claim 1, further comprising a re-feeding start timing control means for controlling a waiting time until re-feeding by the second feeding means. 3. The double-sided image recording apparatus according to claim 2, wherein the waiting time by the re-feed start timing control means is controlled based on a discharge amount of the recording liquid onto the first surface of the recording medium. 4. The double-sided image recording apparatus according to claim 3, wherein the waiting time by the re-feed start timing control means is controlled in consideration of information on a discharge position of the recording liquid onto the first surface of the recording medium. 5. The double-sided image recording apparatus according to claim 3, wherein the ejection amount of the recording liquid is calculated based on the amount of image data recorded on the first surface of the recording medium. 6. A recording medium aligning means according to claim 1, further comprising a recording medium aligning means for suppressing skew feeding of the recording medium when re-feeding by the second paper feeding means. The double-sided image recording apparatus according to the above. 7. The double-sided image recording apparatus according to claim 1, further comprising a drying unit for drying the recording liquid on the recording medium when recording is performed on the recording medium by the recording unit.