JPH06255129A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To perform empty emission at any time even during recording, to eliminate the wastefulness of a recording time when empty emission for preventing the thickening of ink is performed and to certainly prevent the emission inferiority caused by the drying of ink even in the case of a highly detailed image. CONSTITUTION:An opening part 15 is provided at a part of the peripheral surface of a rotary drum 4 and ink storing parts 17, 18 are provided in the rotary drum 14 at the position opposed to a recording head 1 and the ink flying from the recording head 1 through the opening part 15 is received by the ink receiving part 17.

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 ejecting ink from a recording means to a recording material held on a rotary drum for recording.

[0002]

2. Description of the Related Art A recording device having a function such as a printer, a copying machine, a facsimile, or a recording device used as an output device such as a composite electronic device including a computer and a word processor, a workstation, etc. Image (including characters etc.) on the recording material (recording medium) such as paper or plastic thin plate based on
Is configured to record. The recording device can be classified into an inkjet type, a wire dot type, a thermal type, a laser beam type, etc., depending on the type of recording means.

Further, the recording apparatus uses a serial scan type recording apparatus or a line type recording means for recording by a recording means which moves in the paper width direction on a recording material which is intermittently fed by a recording scanning method. A line-type recording device that performs recording only by scanning the recording material in the paper feed direction, and a drum-scan recording device that performs recording by recording means that moves in the drum axis direction with respect to the recording material that rotates with the drum. You can

Of the above recording apparatuses, an inkjet recording apparatus (inkjet recording apparatus) is configured to eject ink from a recording unit (recording head) in accordance with an image signal and perform recording on a recording material. In addition, it is easy to make the recording means compact, it is possible to record high-definition images at high speed, it is possible to record on plain paper without requiring special processing, and the running cost is low and the non-impact method Therefore, there is an advantage that there is little noise and that it is easy to record a color image using multicolor ink. Among them, the line type using a full multi type recording means in which a large number of ejection openings are arranged in the paper width direction can further speed up recording.

In particular, an ink jet type recording means (recording head) for ejecting ink by utilizing heat energy,
Through the semiconductor manufacturing process such as etching, vapor deposition, and sputtering, the electrothermal converter formed on the substrate, the electrode,
By forming a liquid channel wall, a top plate, etc., it is possible to easily manufacture a product having a high-density liquid channel arrangement (ejection port arrangement), a simple and compact structure, and a high-resolution image at high speed. Can be recorded. On the other hand, there are various requirements for the material of the recording material, and in recent years, in addition to ordinary recording material such as plain paper and resin thin plate (OHP), thin paper and processed paper (bunching holes for filing). It has become necessary to use attached paper, perforated paper, paper of any shape, etc.).

The present invention relates to a recording apparatus for performing recording by ejecting ink from a recording means to a recording material held on the peripheral surface of a rotary drum, that is, an ink jet recording apparatus of a drum scan type. The recording scan of the recording apparatus of this system is performed by winding a recording material such as a sheet of paper or a thin plastic plate around a drum and rotating the drum together with the drum (hereinafter referred to as main scanning). It consists of the movement to move to (hereinafter referred to as sub-scan).

[0007]

In the above serial scan type ink jet recording apparatus, a plurality of ejection port groups for ejecting a plurality of ink colors of about 4 to 7 are usually arranged in the main scanning direction. For color recording,
Recording can be performed only when one of the reciprocating movements of the recording head is moved. The reason is that the color tone changes for each recording line when the order of the ink colors is changed. Therefore, there is a disadvantage that the operation time of either one of the reciprocal movements of the recording head is wasted and the recording time is delayed. Further, increasing the moving speed during the non-recording operation leads to an increase in electric power, an increase in noise, and an increase in size of the motor.

In the case of the above-mentioned drum scan type ink jet recording apparatus, the area in which recording is not possible is only in a portion on the rotary drum where the recording material does not exist, that is, in a relatively short time in the drum rotation direction (main scanning direction). Therefore, there are few inconveniences as in the case of the serial scan type described above. However, in the conventional drum scan type inkjet recording device, the only place where ink can be ejected other than recording during recording is a cap or the like arranged outside the rotary drum, so ink ejection is selected. In the case of the on-demand type recording head that is performed in a continuous manner, the ejection time interval becomes large depending on the image, and during that time, the ink near the ejection port increases in viscosity (thickening) due to evaporation of the solvent, and ejection failure (Including discharge).

In particular, ink droplets for recording an image having a pixel density of 400 dots / inch are usually about 30 to 60 pl (picoliter), but about 5 to 15 pl for recording an image with higher image quality. When it is attempted to obtain a small ink droplet, the cross-sectional area of the ejection port of the recording head is further reduced, and the ejection energy is further reduced, so that the ejection failure tends to occur remarkably.

The present invention has been made in view of the above technical problems, and an object of the present invention is to easily prevent thickening of ink in the vicinity of an ejection port without wasting recording time. An object of the present invention is to provide a drum scan type ink jet recording apparatus capable of eliminating the problem of image quality deterioration and recording failure due to defective ink ejection even when recording a high-definition image.

[0011]

According to a first aspect of the present invention, there is provided an ink jet recording apparatus for ejecting ink from a recording means to a recording material held on a rotary drum to perform recording, and a part of a peripheral surface of the rotary drum. An opening is provided in the rotary drum, an ink receiving portion is provided inside the rotary drum at a position facing the recording means, and the ink flying from the recording means through the opening is received by the ink receiving portion. It achieves the purpose.

In addition to the above-mentioned constitution, the inventions of claims 2 to 4 are such that the ink receiving portion is provided on a non-rotating central shaft for axially supporting the rotating drum, and the ink receiving portion is porous. Or a transfer means for guiding the ink in the ink receiving portion to the outside of the rotating drum is formed through the inside of the rotating shaft by forming a through hole in the central shaft that axially supports the rotating drum. By providing the configuration, it is possible to further provide a drum scan type ink jet recording apparatus capable of preventing ink scattering and preventing ink overflow even when recording a large number of sheets continuously. .

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic perspective view showing a schematic configuration of a first embodiment of an inkjet recording apparatus to which the present invention is applied. In FIG. 1, a recording head (recording means) 1 for ejecting ink droplets for recording is mounted on a carriage (moving table) 2, and the carriage 2 is provided with two guide rails 3 installed in the main body of the apparatus. 3 is guided and supported so as to be able to reciprocate in the direction of arrow A along 3. At a position facing the recording head 1, a rotary drum 4 rotatable about an axis parallel to the guide rails 3 is provided. The rotating drum 4 is configured to electrostatically adsorb the recording material 5 such as paper or cloth by means (not shown) and rotate in the arrow B direction. In addition, on the front surface (ejection port surface) of the recording head 1, for example, 6 arranged laterally at a density of 16 pieces / mm.
Four discharge ports are provided.

The recording head (recording means) 1 is an ink jet recording means for ejecting ink by utilizing heat energy, and is provided with an electrothermal converter for generating heat energy. Further, the recording head 1 is
Recording is performed by ejecting ink from the ejection port by utilizing the pressure change caused by the growth and contraction of bubbles due to film boiling caused by the thermal energy applied by the electrothermal converter.

FIG. 2 is a partial perspective view schematically showing the structure of the ink ejection portion of the recording head 1. In FIG. 2, a plurality of electrothermal converters 52 and wirings corresponding thereto are formed on a substrate 51 of the recording head 1 with a layer of a thin film 53 interposed by a manufacturing process (such as a thin film forming method) similar to that of a semiconductor. Are formed. As shown in the drawing, each electrothermal converter 52 is arranged at a position corresponding to each discharge port 59 and liquid path 56. On the substrate 51 (on the thin film 53 on the substrate 51), a liquid path forming member 54 having a plurality of liquid path walls 54A formed in parallel on the lower surface at predetermined intervals is joined. Further, a top plate 55 is joined to the upper surface of the liquid path forming member 54. Although the liquid passage 56 is formed between the liquid passage walls 54A, the liquid passage forming member 54
Are positioned and joined in a positional relationship such that the electrothermal converters 52 are arranged at predetermined positions inside the liquid paths 56.

Each of the liquid passage walls 54A has a predetermined length,
The rear end of each liquid passage 56 has a common liquid chamber 5 formed between the liquid passage forming member 54 and the substrate 51 (or the thin film 53).
It communicates with 7. On the other hand, the other end (tip) of each liquid path 56 is opened at the ejection port surface (face surface) 58 of the recording head 1, and the ejection port 59 is formed by each opening. Thus, the electrothermal converter 52 such as a heating resistor
The ink jet recording head 1 is constituted in which the ink in the liquid path 56 is film-boiling by energizing (applying a pulse voltage) to the film to heat the film, and the ink droplet is ejected from the ejection port 59 due to the pressure change at that time. There is. It should be noted that the recording head 1 is attached in such a manner that the arrangement direction of the plurality of ejection ports 59 intersects the conveyance direction of the recording material 4 (direction of arrow B).

In FIG. 1, 6 is a motor for driving the reciprocating movement of the carriage 2, 7 is a motor pulley fixed to the rotating shaft of the motor 6, 8 is a driven pulley arranged so as to face the pulley 7, and 9 is a driven pulley. Wires 10 wound around the motor pulley 7 and the driven pulley 8 so as to transmit the power of the motor 6 to the carriage 2 are paper feed motors (conveyance motors) for rotationally driving the rotary drum 4. Movement of the recording head 1 in the drum axis direction by controlling the rotation of the motor 6 (sub scanning)
Is controlled. Further, the rotary drum 4 holding the recording material 5 is driven by the paper feed motor 10 via the drive shaft 11.
Is driven to rotate. While the carriage 2 is stationary, the rotary drum 4 is rotated once (main scanning),
Recording (main scanning recording) for one line on the recording material 5 is performed by the recording head 1.

A predetermined position within the moving range of the recording head 1 and out of the rotary drum 4 (in the illustrated example, the drum 4
A cap (capping means) 12 for sealing the ejection port 59 of the recording head 1 is provided at the position on the left side of FIG. This cap 12
Is for protecting the ejection port surface 58 of the recording head 1 and for preventing ink from drying at the ejection port 59. The cap 12 is provided with the ejection port surface 58 of the recording head 1.
It is movable in the direction of arrow C between a position where it is in close contact with and a position where it is separated.

In FIG. 1, the rotary drum 4 is formed of a cylindrical hollow body whose both end surfaces are hermetically sealed, and an opening 15 communicating with the inside is formed in a part of the peripheral surface of the rotary drum 4. There is. The rotary drum 4 is rotatably supported on a non-rotating central shaft 16 fixed to the recording apparatus main body. Then, the recording head 1 inside the rotary drum 4
An ink receiving portion 17 capable of receiving the ink ejected from the recording head 1 is provided at a position opposed to the ejection port 59. In the present embodiment, the ink receiving portion 17 is connected to and supported by the central shaft 16. On the surface of the ink receiving portion 17 facing the recording head 1, a porous ink absorber 18 having excellent ink absorbency is provided. In this way, the ink flying from the recording head 1 into the rotary drum 4 through the opening 15 is received by the ink receiving portion 17 (specifically, the ink absorber 18).

The central shaft 16 of the rotary drum 4 has a central hole 19
Is formed of a cylindrical member having. The ink absorber 18 is integrally provided with a long string-shaped ink lead-out portion 20. The ink lead-out section 20 is provided in the ink absorber 1
8 is formed of a porous material having an excellent ink absorbability, and is integrally formed with the ink absorber 18 by integral molding or adhesion. Then, the ink lead-out portion 20 is guided through a center hole 19 of the central shaft 16 to a waste ink reservoir (not shown) for storing waste waste ink.

Next, the operation of the ink jet recording apparatus shown in FIG. 1 will be described. During non-recording such as storage or during standby while recording,
The ejection port surface 58 of the recording head 1 is protected by being sealed (capped) by the cap 12. When performing recording, after the cap 12 is separated from the recording head 1, the motor 6 is operated and the power transmitted through the pulleys 7 and 8 and the wire 9 causes the recording head 1 together with the carriage 2 to move to the rotary drum 4. The recording material 5 held is moved to a predetermined position (recording start position).

Then, the recording material 5 is rotated together with the rotary drum 4 in the direction of arrow B at a predetermined peripheral speed by the power of the paper feed motor 10, and ink is ejected from the recording head 1 to the recording material 5 in synchronization therewith. To record. When recording of one line (one line) is completed, the carriage 2
At the same time, the recording head 1 is moved to the recording position of the next line (line), and the recording of that line is performed. By repeating this, recording is performed on the entire surface of the recording material 5.

During the above-mentioned recording, when a condition that the ink in the ejection port 59 thickens, such as the interval of ink ejection from some of the ejection ports 59 becomes a predetermined time or more, this is detected, Ink is ejected from the recording head 1 toward the ink receiving portion 17 (specifically, the ink absorber 18 thereof), and control is performed so as to eliminate the cause of ejection failure such as thickening of ink. Such ink ejection other than recording is called, for example, blank ejection or preliminary ejection, and is executed as part of the recovery operation of the recording head 1.

According to the ink jet recording apparatus shown in FIG.
Since the ink can be ejected to the ink receiving portion 17 through the opening 15 provided between the front end and the rear end of the recording material 5 on the rotary drum 4, the blank ejection (or the preliminary ejection) can be performed at any time during recording. (Ejection) can be performed, so that waste of recording time is eliminated, and control is performed to easily and reliably eject ink periodically before the increase in the viscosity of ink near the ejection port 59 reaches a limit. Even in the case of a fine droplet discharge type recording head for performing high-definition recording, it is possible to reliably prevent an increase in viscosity due to evaporation of the solvent in the ink and easily prevent deterioration of recording quality. An inkjet recording device is obtained.

Further, since the ink receiving portion 17 does not rotate, it is possible to surely eliminate the inconvenience such as the waste ink being scattered by the centrifugal force. Further, the ink (waste ink) collected in the ink absorber 18 on the ink receiving portion 17 is
Since it is guided to the waste ink reservoir other than the rotary drum 4 through the inside of the stationary central shaft 16, the ink receiving portion 17 (specifically, the ink absorber 18) is used when recording a large number of sheets continuously. Even if a large amount of ink is ejected, recording can be performed without causing trouble such as ink overflow.

FIG. 3 is a schematic perspective view showing the schematic constitution of the second embodiment of the ink jet recording apparatus to which the present invention is applied. In the present embodiment, a heater 21 is provided in the ink receiving portion 17 in the first embodiment of FIG. 1, and the other parts have substantially the same configuration as the first embodiment of FIG. Therefore, in FIG. 2, parts corresponding to the respective parts in FIG. 1 are indicated by the same reference numerals, and detailed description thereof will be omitted. The heater 21 rises in temperature by being supplied (energized) from a power source (not shown), and the ink receiving portion 1
7 and the ink absorber 18 have the ability to rapidly evaporate water, alcohol and the like, which are the main solvents in the ink (waste ink) received by these and the ink absorber 18.

In the operation of the second embodiment shown in FIG. 3, in addition to the operation of the first embodiment shown in FIG. 1, by energizing the heater 21 at a predetermined time interval or continuously, the ink receiving portion 17 and the ink. The absorber 18 is heated to quickly evaporate water, alcohol, etc., which are the solvents of the ink, which are attached to the absorber 18. Usually, in the ink containing water as the main solvent, the ratio of the evaporation component accounts for about 60 to 90%, and by eliminating (evaporating) them, the volume of the waste ink can be greatly reduced. The substantial ink holding capacity of the ink receiving portion 17 can be greatly improved.

Therefore, according to the second embodiment of FIG.
In addition to the same effect as in the case of the first embodiment described above,
The waste ink holding capacity (ink absorption capacity) of the ink receiving portion 17 (including the ink absorbing body 18) can be significantly improved without requiring an extra space, and further, recording due to scattering or leakage of waste ink can be performed. The effect that the contamination of the device can be more reliably prevented is obtained.

Although the ink absorber 18 for absorbing and holding ink is provided in the second embodiment of FIG. 3, the ink absorber 18 is omitted by heating it to a predetermined high temperature by the heater 21. However, the ink may be received by a high temperature member such as a metal plate that does not absorb ink. In this case, the heater 21 heats up to a predetermined high temperature by supplying a predetermined electric power, and immediately evaporates water and alcohols which are the main solvents in the waste ink adhering to the ink receiving portion 17, thereby greatly increasing the volume. Therefore, it is possible to increase the substantial ink holding capacity of the ink receiving portion 17 and prevent the ink from scattering and overflowing.
Further, the ink receiving portion 17 may be configured to be replaceable and may be replaced with a new one at regular intervals.

Further, when it is necessary to accurately detect the position of the opening 15 of the rotating drum 4, the rotating drum 4 is provided with a disk having a slit corresponding to the position of the opening 15. Alternatively, the recording device main body may be provided with a sensor or a switch that operates based on the position of the slit.

In the above embodiment, the case of the ink jet recording apparatus using one recording head has been described as an example, but the present invention is applicable to a plurality of recording heads (or ink ejecting portions) for recording in different colors. ), Or an inkjet recording apparatus for gradation recording using a plurality of recording heads (or ink ejection units) that perform recording with the same color but different densities. The same can be applied to such a case, and the same effect can be achieved. In addition, the present invention is not limited to the configuration of the recording head, such as a configuration in which the recording head and the ink tank are separately provided and connected by an ink tube, or a replaceable cartridge in which the recording head and the ink tank are integrated is used. Any of them can be applied in the same manner and the same effect can be achieved.

The present invention can be applied to an ink jet recording apparatus which uses a recording means (recording head) using an electromechanical transducer such as a piezo element, but among others, thermal energy is used. The present invention brings about an excellent effect in an ink jet recording apparatus of the type that ejects ink. This is because such a system can achieve high density recording and high definition recording.

Regarding the typical structure and principle thereof, see, for example, US Pat. Nos. 4,723,129 and 4740.
This is preferably done using the basic principles disclosed in 796. This method can be applied to both the so-called on-demand type and the continuous type, but particularly in the case of the on-demand type, a liquid (ink) is used.
By applying at least one drive signal to the electrothermal converter arranged corresponding to the sheet or liquid path in which is stored, which corresponds to the recorded information and causes a rapid temperature rise exceeding nucleate boiling. , Generates heat energy in the electrothermal converter to cause film boiling on the heat acting surface of the recording means (recording head), and as a result, bubbles can be formed in the liquid (ink) in a one-to-one correspondence with this drive signal. So effective.

The liquid (ink) is ejected through the ejection openings by the growth and contraction of the bubbles to form at least one droplet. It is more preferable to make the driving signal into a pulse shape because bubbles can be grown and contracted immediately and appropriately, and thus a liquid (ink) with excellent responsiveness can be ejected. As this pulse-shaped drive signal, US Pat.
Those described in US Pat. Nos. 4,633,359 and 4,345,262 are suitable. Incidentally, US Pat. No. 43131 of the invention relating to the rate of temperature rise of the heat acting surface.
If the conditions described in the specification of No. 24 are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the ejection port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. US Pat. No. 4,558,333, US Pat. No. 4,558,333, which discloses a configuration in which a heat acting portion is arranged in a bending region.
A configuration using the specification of No. 459600 is also included in the present invention. In addition, Japanese Laid-Open Patent Publication No. 123670/1984 discloses a configuration in which a common slit is used as a discharge portion of the electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy. The present invention is also effective as a structure based on Japanese Patent Laid-Open No. 138461/1984, which discloses a structure in which the discharge section is associated with the discharge section. That is, according to the present invention, recording can be reliably and efficiently performed regardless of the form of the recording head.

Further, as described above, the present invention can be effectively applied to a full line type recording head having a length corresponding to the maximum width of a recording material (recording medium) which can be recorded by the recording apparatus. . As such a recording head,
Either a structure that satisfies the length by combining a plurality of recording heads or a structure as one recording head integrally formed may be used. In addition, even with the serial type as in the above example, the recording head fixed to the device main body,
Alternatively, a replaceable chip-type recording head that can be electrically connected to the device body and supply ink from the device body when mounted on the device body, or an ink tank is integrally provided on the recording head itself. The present invention is also effective when the cartridge type recording head described above is used.

Further, it is preferable to add recovery means or preliminary auxiliary means to the recording head provided as a constitution of the recording apparatus in the present invention because the effect of the present invention can be further stabilized. Specific examples thereof include capping means, cleaning means, pressurizing or suctioning means, electrothermal converters or heating elements other than these, or preheating means for the recording head. It is also effective to perform stable recording by performing a preliminary discharge mode in which discharge different from recording is performed.

As described above, regarding the type or number of recording heads to be mounted, for example, only one is provided corresponding to a single color ink, or a plurality of recording heads having different recording colors and densities are provided. A plurality of inks may be provided corresponding to the ink. That is, for example, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but may be either the recording head is integrally configured or a combination of a plurality of recording heads may be used. The present invention is extremely effective for an apparatus provided with at least one of color colors or full colors by color mixing.

In addition, in the above-described embodiments of the present invention, the ink is described as a liquid, but it is an ink that solidifies at room temperature or lower and that softens or liquefies at room temperature, or an ink jet. In the method, the temperature of the ink itself is generally adjusted within a range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is within a stable ejection range. It may be in a liquid form. in addition,
Whether the temperature rise due to thermal energy is positively used as the energy for changing the state of the ink from the solid state to the liquid state, or the ink that solidifies in the standing state is used for the purpose of preventing ink evaporation In any case, the ink is liquefied by applying the thermal energy according to the recording signal and the liquid ink is ejected,
The present invention is also applicable to the case of using an ink which has a property of being liquefied only by thermal energy, such as one which starts to solidify when it reaches the recording medium.

The ink in such a case is disclosed in JP-A-54-54.
As described in JP-A-56847 or JP-A-60-71260, a form in which the electrothermal converter is opposed to a liquid sheet or a solid material held in the recesses or through holes of the porous sheet. May be In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, as a form of the ink jet recording apparatus according to the present invention, in addition to the one used as an image output terminal of an information processing apparatus such as a computer, a copying apparatus combined with a reader or the like, and a facsimile apparatus having a transmitting / receiving function. And the like may be used.

[0042]

As is clear from the above description, according to the first aspect of the invention, in the ink jet recording apparatus for recording by ejecting ink from the recording means to the recording material held on the rotating drum, the rotation is performed. An opening is provided in a part of the peripheral surface of the drum, and an ink receiving portion is provided inside the rotary drum at a position facing the recording means, and the ink receiving portion receives ink flying from the recording means through the opening. With this configuration, it is possible to easily prevent thickening of ink in the vicinity of the ejection port without wasting the recording time, and even when recording a high-definition image, the image quality is deteriorated or recording is not possible due to defective ink ejection. There is provided a drum scan type ink jet recording apparatus capable of eliminating the above problem.

According to the inventions of claims 2 to 4, in addition to the above configuration, the ink receiving portion is provided on a non-rotating central shaft for axially supporting the rotating drum, and the ink receiving portion is A structure having a porous ink absorber, or a through hole is formed in a central shaft that axially supports the rotating drum, and a transfer means for guiding the ink in the ink receiving portion to the outside of the rotating drum is provided inside the central shaft. In addition to the above effects, there is provided a drum scan type ink jet recording apparatus capable of preventing ink scattering and preventing ink overflow even when recording a large number of sheets in succession. Provided.

[Brief description of drawings]

FIG. 1 is a schematic partially cutaway perspective view showing a schematic configuration of a first embodiment of an inkjet recording apparatus to which the present invention is applied.

FIG. 2 is a partially cutaway perspective view schematically showing the structure of an ink ejection portion of the recording means in FIG.

FIG. 3 is a schematic partially cutaway perspective view showing a schematic configuration of a second embodiment of an inkjet recording apparatus to which the present invention is applied.

[Explanation of symbols]

 1 Recording Means (Recording Head) 2 Carriage 3 Guide Rail 4 Rotating Drum 5 Recording Material 6 Motor 10 Paper Feed Motor 12 Cap 15 Opening 16 Central Shaft 17 Ink Receptor 18 Ink Absorber 19 Center Hole (Through Hole) 20 Ink Outlet 21 Heater 52 Electrothermal converter 56 Liquid path 57 Common liquid chamber 58 Discharge port surface 59 Discharge port

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Mitaka Okamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (6)

[Claims] 1. An ink jet recording apparatus for ejecting ink from a recording means to a recording material held on a rotary drum for recording, wherein an opening is provided in a part of a peripheral surface of the rotary drum, and An ink jet recording apparatus, wherein an ink receiving portion is provided at a position facing the recording means inside, and ink flying from the recording means through the opening is received by the ink receiving portion. 2. The ink jet recording apparatus according to claim 1, wherein the ink receiving portion is provided on a non-rotating central shaft for axially supporting the rotary drum. 3. The ink jet recording apparatus according to claim 1, wherein the ink receiving portion has a porous ink absorber. 4. A through hole is formed in a central shaft that axially supports the rotating drum, and a transfer means for guiding the ink in the ink receiving portion to the outside of the rotating drum is provided through the inside of the central shaft. The inkjet recording apparatus according to claim 1. 5. The inkjet recording apparatus according to claim 1, wherein the recording unit is an inkjet recording unit including an electrothermal converter that generates thermal energy used to eject ink. 6. The ink jet recording apparatus according to claim 5, wherein the recording unit ejects the ink from the ejection port by utilizing film boiling generated in the ink by the thermal energy generated by the electrothermal converter. .