JP2001341321A - Ink jet recording device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent ink discharged in a preliminary discharge receiver from leaking from an opening. SOLUTION: A carriage 7 of an ink jet recording apparatus.
A head unit 1 including a recording head 2 and an ink tank 3 is mounted thereon with the ejection port surface 2a facing upward. The recording head 2 performs image recording on the lower surface of the recording medium 12 by discharging ink upward from the discharge ports. A pre-discharge receiver 6 for receiving pre-discharged ink from the recording head 2 is arranged outside the image recordable area on the recording medium 12 in order to maintain and recover the ink discharge performance of the recording head 2. The pre-discharge receiver 6 has an opening 1 serving as an inlet for pre-discharged ink.
Above the opening 14 is provided a ceiling surface 16 which is inclined with respect to the horizontal direction and is arranged so that the ink preliminarily ejected in the preliminary ejection receiver 6 adheres thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus for recording on a recording medium by discharging ink droplets onto the recording medium and attaching the ink droplets to the recording medium.

[0002]

2. Description of the Related Art With the development of personal computers in recent years, remarkable technological innovations have occurred in recording technologies positioned as outputs. Above all, the technology of recording by ink-jet has been spotlighted as an output device for not only characters but also images, particularly images such as photographs, which require multi-gradation, multi-color, and high resolution.

[0003] An ink jet recording apparatus generates an electric signal based on image information and outputs the signal through an electrodynamic system conversion device.
Usually, minute ink droplets are ejected on demand from a large number of nozzles arranged and attached to paper or another recording medium to perform printing or image formation.

A recording head provided in an ink jet recording apparatus is generally configured so that the direction in which ink is discharged is downward. This is because it is necessary to prevent the ink-wetted surface of the recording medium immediately after recording from touching the recording medium that has been recorded before in the paper discharge unit, thereby preventing the image from being stained. In addition, in the case where the direction in which ink is ejected is configured to face downward, when the recording apparatus encounters some trouble, the ink drops downward from the nozzle by gravity, so that the ejection port forming surface of the recording head, the nozzle, It also has the meaning of preventing ink from adhering to an electric circuit, a contact, or the like for realizing ink discharge from the ink, and avoiding the occurrence of a major trouble.

On the other hand, in a print head configured to eject ink downward, the ink flow path inside the nozzle is maintained at a pressure lower than the atmospheric pressure (a so-called negative pressure) so that the ink is not inadvertently dropped during the printing operation. There is a need to. Various means are used as means for generating a negative pressure. The simplest is to arrange a flexible and non-breathable tube in the recording head and use it as an ink supply path, connect an ink bag etc. to the other end of the tube,
There is a method of generating a negative pressure by placing it at a position lower than an ink ejection port in a printing apparatus. In addition, a recording head with an ink ejection port and an ink storage section that integrates a porous ink absorbing member with ink to be ejected and generates an ink negative pressure can be exchanged on a carriage. Some are mounted.

[0006] However, both systems have drawbacks. In the former method, if the recording apparatus is left unused for a while, the air that has passed through the tube wall forms bubbles inside the tube, and these bubbles cause problems in the recording operation, that is, the ink discharge operation. Further, in order to avoid this, it is necessary to forcibly suck the ink corresponding to the volume of the tube from the discharge port of the nozzle before the recording operation to remove bubbles inside the tube. This means that the ink is not used for image recording and is wasted merely for ensuring the reliability of the ink ejection operation.

In the latter type, a negative pressure is easily generated by using a porous absorbent such as urethane foam or polypropylene fiber having a shape for generating a capillary force necessary for holding ink. However, since the porous absorber has a large surface area, there are various adverse effects such as an increase in chemical elution from the porous absorber to the ink.

In order to avoid the drawbacks of a recording apparatus having a structure in which ink is ejected downward, in particular, the complexity of necessity of generating a negative pressure, an upward ejection type recording apparatus which ejects ink upward is employed. I need to. Furthermore, for example, when printing is to be performed simultaneously on both sides of a recording medium, a recording head that discharges ink downward and a recording head that discharges ink upward are provided.
It is necessary to perform recording simultaneously using these recording heads. When an upward discharge type recording apparatus is used, no special measures are required to generate a negative pressure because the discharge port forming surface of the recording head is arranged above the liquid level of the supplied ink. On the contrary, it is necessary to overcome the drawbacks inherent in the upward discharge type recording apparatus.

[0009]

One of the disadvantages peculiar to the upward discharge type recording apparatus is that the preliminary discharge receiver or idle discharge receiver used in the downward discharge type recording apparatus cannot be used as it is. It is mentioned.

Prior to the printing operation, the preliminary ejection receiver / empty ejection receiver receives the ink ejected from the recording head at a predetermined position outside the recordable area for the recording medium, and replaces it with the waste ink. It has the function of sending to the processing system. There are several reasons why this configuration is necessary. In particular, it is to discharge concentrated ink inside the nozzles when the use of the printing apparatus has been suspended for a long time.

When the printing operation is performed after the use of the printing apparatus has been suspended for a long period of time, concentrated ink close to the discharge port of the nozzle is first discharged, and gradually the inside of the nozzle is gradually discharged.
Further, the ink is ejected from the ink supply system behind the ink supply system. In the image recorded at this time, the color tone is dark at the beginning, and the color tone of the original ink becomes later,
Density unevenness occurs. In particular, 50% on a white recording medium.
In the case of recording adjacent uniform halftones such as% and 25%, a dark portion is first formed and becomes thinner toward the back, so that uneven density is particularly noticeable.

Therefore, in order to prevent such a problem from occurring, an image is formed on a recording medium after the concentrated ink inside the nozzle is discharged by using the above-described preliminary discharge receiver or idle discharge receiver. That is usually done.

In the downward printing type recording apparatus, the preliminary ejection receiver is disposed below the recording head with the opening thereof facing upward, and the ink ejected into the preliminary ejection receiver drops downward according to gravity and moves to the bottom. It is stored in. For this reason, in the downward discharge type recording apparatus, there is no problem in storing the ink discharged from the recording head in the preliminary discharge receiver, except for providing a drain for collecting waste ink. , Did not require special ingenuity.

On the other hand, in a recording apparatus of the upward discharge type, the preliminary discharge receiver is arranged above the recording head with the opening directed downward. In the upward ejection type recording apparatus, when the preliminary ejection receiver in the downward ejection type recording apparatus is used as it is, the ink ejected toward the top surface in the preliminary ejection receiver may drop from the top surface according to gravity. It flows down the wall and returns to the opening again. In the worst case, the ink that has returned to the opening drops out of the preliminary ejection receiving portion through the opening, and contaminates the ejection port forming surface of the recording head and the inside of the recording apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an ink jet recording apparatus capable of preventing ink discharged in a preliminary ejection receiver from leaking from an opening. is there.

[0016]

In order to achieve the above object, an ink jet recording apparatus according to the present invention comprises a recording head for recording an image on a lower surface of a recording medium by discharging ink upward from a discharge port against gravity. In the ink jet recording apparatus provided with a preliminary ejection receiver for receiving ink preliminarily ejected in order to maintain and recover the ink ejection performance of the recording head, the preliminary ejection receiver serves as an inlet for the preliminarily ejected ink. An ink leakage prevention means having an opening and preventing ink preliminarily ejected into the preliminary ejection receiver from leaking out of the preliminary ejection receiver from the opening is provided above the opening. It is characterized by the following.

According to the ink jet recording apparatus of the present invention, the ink preliminarily ejected from the recording head through the opening into the preliminary ejection receiver leaks out of the preliminary ejection receiver through the opening of the preliminary ejection receiver. Thus, it is possible to prevent the ejection port forming surface of the recording head and the inside of the recording apparatus from being stained with ink.

In addition, the ink leakage prevention means is inclined with respect to the horizontal direction, and is arranged such that the ink preliminarily ejected from the recording head through the opening to the preliminary ejection receiver adheres thereto. It is preferable to adopt a configuration including members. According to this configuration, the ink preliminarily ejected into the preliminary ejection receiver and attached to the ceiling member flows downward along the ceiling member due to gravity. Therefore, it is possible to discharge the pre-discharged ink to the outside of the pre-discharge receiver without going to the opening.

Further, a plurality of grooves may be formed on a surface of the ceiling member to which the ink adheres, along a tilt direction of the ceiling member. According to this, since the groove generates a capillary force, after the ink which has been preliminarily ejected is collected, the ink can flow along the ceiling member without dripping the ink. Therefore, it is possible to more reliably prevent the leakage of the ink from the opening.

[0020] In addition, an upwardly protruding protruding portion is provided around the edge of the opening of the predischarge receiver, so that the predischarged ink flows from the ceiling member to the periphery of the opening. Even if the ink is dropped, the ink is blocked around the opening by the protrusion, so that there is no fear that the ink leaks out of the preliminary discharge receiver through the opening.

Further, by adopting a structure in which an ink absorber is provided around the edge of the opening of the preliminary ejection receiver, it is possible to more effectively prevent the ink from dropping or leaking from the opening. become.

Further, the preliminary discharge receiver has an ink discharge part for discharging the stored ink to the outside of the preliminary discharge receiver, and the ink absorber is provided continuously to the ink discharge part. Configuration.

Further, a carriage mounted with the recording head and scanned on the recording medium is further provided.
The preliminary ejection receiver may be arranged at a position facing an ejection port surface of the recording head moved by the carriage outside an image recordable area for the recording medium.

[0024]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a main configuration of an embodiment of an ink jet recording apparatus configured to discharge ink upward according to the present invention.

As shown in FIG. 1, in the ink jet recording apparatus of the present embodiment, a carriage 7 on which a head unit 1 including a recording head 2 and an ink tank 3 containing ink supplied to the recording head 2 is mounted will be described later. The recording medium M is constituted by a paper feed roller 9 and a paper discharge roller 8, and is disposed below a conveyance path of the recording medium M. The head unit 1 discharges ink onto the lower surface of the recording medium 12 to form an image on the recording medium 12 so as to form an image on the recording medium 12.
Is mounted on the carriage 7 with the.

The carriage 7 has two sliding shafts 11a, 1
1b, and a direction (perpendicular to the drawing) perpendicular to the transport direction (left-right direction in the drawing) of the recording medium 12 via a timing belt (not shown) by a carriage driving motor (not shown). It is configured to reciprocate. The carriage 7 is provided with a head fixing lever 4 rotatable about a rotation shaft 4a. By fixing the head unit 1 to the carriage 7 while rotating the head unit 1, the head unit 1 is accurately mounted on the carriage 7. It is possible to do.

The two sliding shafts 11a, 11b
Supports the carriage 7, determines the scanning direction of the carriage 7, regulates the distance between the ejection port surface 2 a of the recording head 2 and the recording medium 12 opposed thereto, and forms a highly accurate image on the recording medium 12. Is what makes it possible.

This ink jet recording apparatus alternately repeats the reciprocating movement of the recording head 2 accompanying the movement of the carriage 7 and the conveyance of the recording medium 12 at a predetermined pitch.
By discharging ink from the recording head 2 while the recording head 2 is moving, an image is formed on the lower surface of the recording medium 12 by one scan.

On the upstream side of the carriage 7 with respect to the transport direction of the recording medium 12, a pair of paper feed rollers 9 constituting transport means for transporting the recording medium 12 is provided. The recording medium 12 is supplied to the paper feed roller 9 from an auto sheet feeder (not shown) or a cassette (not shown) attached to the recording apparatus. Note that the paper feed roller 9
Is driven by a drive unit (not shown) via a drive gear 10.

A guide member (not shown) is provided downstream of the paper feed roller 9 in the transport direction of the recording medium 12. The guide member prevents the recording medium 12 from being lifted or twisted at a position facing the ink ejection port face 2a, prevents the ink ejection port face 2a from contacting the recording medium 12, and prevents the ink ejection port face 2a from coming into contact with the recording medium. The distance between the recording medium 12 and the lower surface of the recording medium 12 is kept constant, and the ink landing position of the recording medium is maintained with high accuracy.

Further, the recording medium 12 is more than the carriage 7.
A pair of paper discharge rollers 8 is provided on the downstream side in the transport direction. When the recording medium 12 reaches the discharge roller 8, the recording medium 12 is further conveyed mainly by the discharge roller 8, and the recording medium 12 on which the image is formed by the recording head 2 is placed outside the recording apparatus. Is discharged.

FIG. 2 is a perspective view showing the head unit shown in FIG. As shown in FIG.
A plurality of ink discharge ports for discharging ink are arranged on the discharge port surface 2a, and the ink droplets 13 are discharged above the discharge port surface 2a, that is, in a direction indicated by an arrow A in FIG. 12 is configured to form an image on the lower surface. As shown in FIG. 1, an ink supply pipe 5 for supplying the ink in the ink tank 3 to the nozzles is provided below the recording head 2. The ink supply pipe 5 is formed of a thin tube, sucks up ink by utilizing capillary force, and supplies the ink to the discharge port surface 2a. In the vicinity of the discharge port of each nozzle, a meniscus surface of ink is formed by balancing negative pressure and surface tension generated by gravity.

In the ink jet recording apparatus according to the present embodiment, the preliminary ejection receiver 6 for receiving the ink ejected from the recording head 2 has an opening 14 (FIG. 3) serving as an inlet for the ink preliminarily ejected from the recording head 2. ) Facing downward.

FIG. 3 is a perspective view showing the preliminary ejection receiver shown in FIG. 1 and the head unit moved below the preliminary ejection receiver. In FIG. 3, the preliminary discharge receiver 6 is shown in a partially broken state in order to show the opening 14 of the preliminary discharge receiver 6.

In the printing apparatus, the preliminary ejection receiver 6
The recording head 2 is disposed outside a recordable area for the recording medium 12. Describing in more detail, the preliminary discharge receiver 6 includes a carriage 7 along the sliding shafts 11a and 11b.
(See FIG. 1) near the end of the moving direction B, and when the carriage 7 is moved to this end,
The discharge port surface 2 a of the head unit 1 mounted on the carriage 7 faces the opening 14 of the preliminary discharge receiver 6.

FIG. 4 is a sectional view showing the preliminary ejection receiver and the head unit shown in FIG.

The preliminary discharge receiver 6 in this embodiment has a preliminary discharge receiving ceiling surface 16 for receiving ink droplets 20 preliminary discharged from the head unit 1 above the surface provided with the openings 14. . The ceiling surface 16 is inclined with respect to the horizontal direction.

The preliminary ejection ink droplet 20 ejected from the head unit 1 through the opening 14 into the preliminary ejection receiver 6
Adhere to the preliminary discharge receiving ceiling surface 16. The ink that has adhered to the ceiling surface 16 flows downward due to gravity along the inclined ceiling surface 16, and is provided at a lower portion of the preliminary discharge receiver 6 as an ink discharge unit that discharges the ink to the outside of the preliminary discharge receiver 6. Collected in the preliminary discharge receiving bottom 21.
The ink collected in the predischarge receiving bottom 21 is sucked by the suction pump 15 via the waste ink conduit 22 connected to the predischarge receiving bottom 21 and discharged to the waste ink reservoir (not shown).

As described above, the inclined preliminary ejection receiving ceiling surface 16 functions as an ink leakage preventing means for preventing the ink from leaking out of the preliminary ejection receiving portion 6 through the opening 14, and the preliminary ejection is performed. Since the ink is discharged to the outside of the preliminary discharge receiver 6 without going to the opening 14, it is possible to prevent the pre-discharged ink from leaking from the opening 14 and contaminating the head unit 1 or the recording apparatus. it can.

In the present embodiment, the preliminary discharge receiving bottom 2
Although the waste ink in 1 is configured to be forcibly discharged by using the suction pump 15, it may be configured to be naturally discharged only by gravity without using the suction pump 15. If the required volume of the preliminary ejection receiving bottom 21 can be ensured, the waste ink guide 22 is not always necessary.
The preliminary ejection receiving bottom 21 may be directly connected to the waste ink reservoir.

The recording head 2 used in the present embodiment may be any type as long as it can eject ink upward from the ejection port against the gravity, and the ejection method is arbitrary. Therefore, as a method of ejecting the ink, for example, a so-called bubble jet (registered trademark) method in which a film is boiled in the ink using an electrothermal transducer such as a heater and the ink is ejected by the pressure impact, is used. Alternatively, a so-called piezo-type inkjet system may be used in which the volume of a predetermined location inside the nozzle is contracted by using an electrodynamic converter such as a piezo element, and the ink is ejected with the change in volume or pressure. Good.

In the above description, the serial type ink jet recording apparatus adopting a serial scan system in which the recording head 2 is scanned in a direction intersecting the transport direction (sub-scanning direction) of the recording medium 12 has been described as an example. However, the ink jet recording apparatus according to the present embodiment is not limited to the serial type, and after performing recording for one line at a time on the recording medium 12, a predetermined amount of paper feed (pitch conveyance) is performed.
Furthermore, image recording is performed on the entire recording medium 12 by repeating the operation of collectively recording the next line.
A so-called line type ink jet recording apparatus may be used.

(Modifications) Next, various modifications of the above-described preliminary discharge receiver will be described with reference to the drawings.

<First Modification> FIG. 5 is a cross-sectional view showing a first modification of the preliminary discharge receiver shown in FIG. 3 and the like, and a head unit disposed therebelow. In this modification,
The preliminary discharge receiving ceiling surface 16 is formed to be longer than the example shown in FIG. h.

By doing so, it is possible to prevent ink from dripping from the lower end of the ceiling surface 16 onto the surface where the opening 14 of the preliminary ejection receiver 6 is formed. It is possible to more reliably prevent the ink preliminarily ejected to the opening 16 from going to the opening 14.

<Second Modification> FIG. 6 is a perspective view showing a second modification of the preliminary ejection receiver shown in FIG. 3 and the like, and a head unit disposed therebelow. FIG. FIG. 3 is a cross-sectional view showing the preliminary discharge receiver and the head unit shown in FIG.

In this modification, the opening 1 of the preliminary ejection receiver 6
4, an opening flange 17 is provided as a protruding portion toward the inside of the cavity of the preliminary discharge receiver 6. As a result, even if the ink droplet 20 that has been preliminarily ejected drops from the ceiling surface 16 to the periphery of the opening 14, the ink remains
7 prevents the ink from leaking to the outside of the preliminary ejection receiver 6 through the opening 14 because the ink is blocked around the opening 14. The width W of the opening 14 is desirably as narrow as possible. However, the width W is determined in consideration of the distance to the ceiling 16, the inclination angle of the ceiling 16, the height of the collar 17, the ink ejection speed, and the like. It is set appropriately. Note that these dimensions and shapes are design items.

<Third Modification> FIG. 8 is a cross-sectional view showing a third modification of the preliminary ejection receiver shown in FIG. 3 and the like, and a head unit disposed therebelow. The preliminary discharge receiving ceiling surface 23 in the present modified example has a sloped portion divided into two at a central portion above the opening 14 and has a triangular roof shape.

The pre-discharged ink droplet 20 flies for a longer time than when an image is formed on a recording medium.
Discharge direction varies. Therefore, when the ceiling surface is, for example, the form shown in FIG. 4, the ink droplets ejected in the left direction in the drawing bounce off the left side surface of the preliminary ejection receiver 6 without adhering to the ceiling surface 16, and the like. It may fall toward.

On the other hand, according to the present modification, the inclined portion of the ceiling surface 23 is divided into two at the central portion above the opening 14 and both inclined portions are inclined downward, so that the ink The ink droplets 20 can be satisfactorily adhered to the ceiling surface 23 even when the ejection direction of the ink droplets varies. Therefore, according to the present modification, it is possible to prevent the ink from dropping directly toward the opening 14, and since the area of the ceiling surface 23 to which the ink is attached increases, the ink is held on the ceiling surface 23. The amount of ink to be removed is also increased, and the leakage of ink from the opening 14 can be more reliably prevented.

In this modification, it is preferable that the above-mentioned opening flange 17 is provided around the opening 14.

<Fourth Modification> FIG. 9 is a sectional view showing a fourth modification of the preliminary ejection receiver shown in FIG. 3 and the like, and a head unit disposed therebelow. The pre-discharge receiving ceiling surface 23 in this modification is also formed into a triangular roof shape in which the inclined portion is divided into two at the center above the opening portion 14, similarly to that shown in FIG. . Further, in the present modification, a porous absorber 18 made of a material such as polyurethane is provided on the surface of the preliminary discharge receiver 6 where the opening 14 is formed and in the preliminary discharge receiver bottom 21. . The porous absorber 18 is not provided in a region above the opening 14 on the surface of the preliminary discharge receiver 6 where the opening 14 is formed. In this modification,
No opening flange (see FIG. 8 and the like) is provided around the opening 14.

The absorber 18 is capable of generating a negative pressure due to capillary force and absorbing ink therein. Therefore, it is possible to more effectively prevent the ink from dropping or leaking from the opening 14. The absorber 18
The negative pressure generated at the opening 14 need not be extremely large.
The pressure may be a negative pressure enough to prevent ink from leaking from the ink. In the present modified example, the absorber 18 is provided with the preliminary discharge receiving bottom 21.
Since the inside is filled, the leakage of the ink from the opening 14 hardly occurs.

In order to more reliably prevent the ink from leaking from the opening 14, an opening collar 17 may be provided around the opening 14 in this modification as shown in FIG.

<Fifth Modification> FIG. 11 is a cross-sectional view taken along the line CC ′ of the ceiling surface of the preliminary ejection receiving portion shown in FIG. 4 or FIG. Preliminary discharge receiving ceiling surface 1 in each of the above modified examples
In Nos. 6 and 23, the surface for receiving the ink is formed to be flat. On the other hand, as shown in FIG. 11, a plurality of narrow grooves 19 are formed on the ceiling surfaces 16 'and 23' of the present modified example along the direction in which the ceiling surface is inclined.

Since this narrow groove 19 generates a capillary force,
After collecting the ink droplets 20 ejected from the head unit 1, the ink can flow along the ceiling surface without dripping the ink downward. Therefore, it is possible to more reliably prevent the ink from dropping and leaking from the opening 14.

[0058]

As described above, in the ink jet recording apparatus according to the present invention, the preliminary ejection receiver for receiving the ink preliminarily ejected from the recording head ejecting the ink upward from the ejection port is provided at the entrance of the preliminarily ejected ink. An ink leakage prevention means for preventing the ink preliminarily ejected in the preliminary ejection receiver from leaking out of the preliminary ejection receiver from the opening is provided above the opening. It is possible to prevent the ink from leaking out of the preliminary discharge receiver from the opening of the discharge receiver, and prevent the discharge port forming surface of the print head and the inside of the printing apparatus from being stained with the ink.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main configuration in an embodiment of an ink jet recording apparatus of the present invention.

FIG. 2 is a perspective view showing the head unit shown in FIG.

FIG. 3 is a perspective view showing the preliminary discharge receiver shown in FIG. 1 and a head unit moved below the preliminary discharge receiver.

FIG. 4 is a sectional view showing a preliminary ejection receiver and a head unit shown in FIG. 3;

FIG. 5 is a sectional view showing a first modified example of the preliminary ejection receiver shown in FIG. 3 and a head unit.

FIG. 6 is a perspective view showing a second modification of the preliminary ejection receiver shown in FIG. 3 and the like and a head unit.

FIG. 7 is a sectional view showing a preliminary ejection receiver and a head unit shown in FIG. 6;

FIG. 8 is a sectional view showing a third modified example of the preliminary ejection receiver shown in FIG. 3 and a head unit.

9 is a sectional view showing a fourth modification of the preliminary ejection receiver shown in FIG. 3 and a head unit.

FIG. 10 is a cross-sectional view showing another example of the preliminary ejection receiver shown in FIG. 9 and a head unit.

FIG. 11 shows the preliminary discharge receiving ceiling surface shown in FIG. 4 or FIG.
It is sectional drawing in the CC 'line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head unit 2 Recording head 2a Discharge port surface 3 Ink tank 4 Head fixing lever 5 Ink supply pipe 6 Pre-discharge receiver 7 Carriage 8 Discharge roller 9 Feed roller 10 Drive gears 11a, 11b Sliding shaft 12 Recording medium 13 Ink droplet 14 Opening 15 Suction pump 16, 23, 16 ', 23' Pre-discharge receiving ceiling surface 17 Opening collar 18 Absorber 19 Narrow groove 20 Pre-discharge ink drop 21 Pre-discharge receiving bottom 22 Waste ink guide

Claims (7)

[Claims] 1. A recording head that discharges ink upward from a discharge port against gravity to record an image on a lower surface of a recording medium is preliminarily discharged in order to maintain and recover ink discharging performance of the recording head. In the ink jet recording apparatus having a preliminary ejection receiver for receiving the pre-ejected ink, the preliminary ejection receiver has an opening serving as an inlet for the pre-ejected ink, and the ink pre-ejected in the preliminary ejection receiver is An ink jet recording apparatus, wherein an ink leakage preventing means for preventing leakage from the opening to the outside of the preliminary discharge receiver is provided above the opening. 2. A ceiling, wherein the ink leakage prevention means is inclined with respect to the horizontal direction and is disposed such that ink preliminarily ejected from the recording head passes through the opening into the preliminary ejection receiver. 2. The ink jet recording apparatus according to claim 1, comprising a member. 3. The ink jet recording apparatus according to claim 2, wherein a plurality of grooves are formed on a surface of the ceiling member to which the ink adheres, along a tilt direction of the ceiling member. 4. The ink jet recording apparatus according to claim 1, wherein a protrusion protruding upward is provided around an edge of the opening of the preliminary ejection receiver. 5. The ink jet recording apparatus according to claim 1, wherein an ink absorber is provided around an edge of the opening of the preliminary ejection receiver. 6. The pre-discharge receiver includes an ink discharge unit for discharging the stored ink to the outside of the pre-discharge receiver, and the ink absorber is provided continuously to the ink discharge unit. The inkjet recording apparatus according to claim 5. 7. A carriage mounted with the recording head and scanned on the recording medium, wherein the preliminary ejection receiver is moved by the carriage out of an image recordable area on the recording medium. The inkjet recording apparatus according to claim 1, wherein the inkjet recording apparatus is disposed at a position facing a discharge port surface of the recording head.