JP2000117998A - Air shock absorber - Google Patents

Air shock absorber

Info

Publication number
JP2000117998A
JP2000117998A JP29837698A JP29837698A JP2000117998A JP 2000117998 A JP2000117998 A JP 2000117998A JP 29837698 A JP29837698 A JP 29837698A JP 29837698 A JP29837698 A JP 29837698A JP 2000117998 A JP2000117998 A JP 2000117998A
Authority
JP
Japan
Prior art keywords
ink
air
recording head
recording
reservoir
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP29837698A
Other languages
Japanese (ja)
Inventor
Tetsuhito Kageyama
徹人 蔭山
Original Assignee
Canon Inc
キヤノン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP29837698A priority Critical patent/JP2000117998A/en
Publication of JP2000117998A publication Critical patent/JP2000117998A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To connect a stationary ink tank 20 of an ink jet recording apparatus and a recording head 4 on a moving carriage with tubes 2, 3 and the like, and to perform pressure fluctuation due to ink flow in these tubes. In the ink supply system provided with the air buffer device 1 for buffering the ink and stabilizing the ink discharge, downsizing of these related devices and shortening of the ink circulation replenishment time are realized. For this purpose, a configuration is adopted in which the cross-sectional area of the ink storage section (10) at the lower part of the air buffer container (1) is narrowed significantly as compared with the cross-sectional area of the upper air storage section (11).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply apparatus for supplying ink to a recording head used in an ink jet recording apparatus and an ink jet recording apparatus provided with the apparatus.

[0002]

2. Description of the Related Art Conventionally, in an ink jet recording apparatus for printing by reciprocating a recording head mounted on a carriage, it is necessary to increase the capacity of the ink tank in order to reduce the frequency of ink tank replacement. In the recording head integrated type apparatus, since the inertia on the carriage is increased, the ink tank is arranged at a position where it does not move,
A tube or the like is connected to the recording head on the carriage, and the recording head is supplied using various pumps or the like.

However, in an ink jet recording apparatus, a minute negative pressure is always applied to the atmospheric pressure so that the recording ink is not dripped except at the time of printing driving from the recording head, thereby achieving both ejection and useless dripping prevention. When reciprocation of printing by the carriage is added to this, the recording ink in the connection tube also flows, and the recording ink in the recording head is extruded or pulled, causing a change in the ejection amount, causing unevenness in printing and uneven printing. It causes ejection.

As a countermeasure, an air reservoir is provided between the connecting tube and the recording head in the vicinity of the recording head to utilize air elasticity to buffer pressure fluctuations due to ink flow in the tube and to stabilize ejection. There is a known technique for arranging the information.

This type of air buffering device also has a function of separating the air from the ink in the tube into which the air is mixed and supplying only the ink to the recording head by using the upper portion as an air reservoir and the lower portion as an ink reservoir. In addition, it is necessary to set the liquid level of the ink reservoir so that air does not enter the recording head from the air reservoir due to the fluctuation of the liquid surface of the ink reservoir due to the reciprocation of the carriage.

[0006]

However, in order to utilize the lower part of a simple-shaped air buffer device such as a rectangular parallelepiped, if a predetermined liquid level is secured, the ink reservoir volume of this kind is usually increased. Accordingly, the ink volume was also increased. This ink volume is related to the amount of ink required for the ink circulation operation for the purpose of adjusting the liquid level drop due to the air that has penetrated through the tube wall, and the amount of ink replenishment when the pump is an air pressurizing / depressurizing type pump. Therefore, it has been difficult to reduce the size of the ink supply container for pressurizing and depressurizing and to shorten the ink circulation supply time.

The present invention has been made in view of the above-described aspects, and has as its object to provide means capable of reducing the size of the ink supply container and shortening the circulation supply time.

[0008]

SUMMARY OF THE INVENTION Therefore, in the present invention, an object of the present invention is to provide an air damper of any of the following items (1) to (6) to achieve the above object. is there.

(1) Means for scanning the recording head in a direction intersecting with the transport direction of the recording medium, an ink storage tank disposed at a portion not affected by the scanning of the recording head, and scanning the recording head An ink jet recording apparatus comprising: an air buffer fixed to a unit for performing printing; and a unit for supplying recording ink to the print head from the ink storage tank via the air buffer. The lower ink storage section includes a storage section and a lower recording ink storage section, and a horizontal cross-sectional area of the lower ink storage section is
The air buffer device according to claim 1, wherein the upper air reservoir has a smaller horizontal cross-sectional area.

(2) The horizontal cross-sectional area of the ink reservoir is 7 mm 2 or more over 10 mm or more of the distance from the recording head junction to the liquid level of the ink reservoir. The air buffer according to 1).

(3) The air according to any one of (1) and (2) above, wherein the ink storage section is mainly formed of a separate tubular member, and is formed by joining with the air storage member. Shock absorber.

(4) The air buffer as described in any one of (1) and (2) above, wherein a suppression plate is formed in the ink reservoir in a direction perpendicular to the recording head scanning direction. apparatus.

(5) The air buffering device has a purpose of supplying a liquid supply port for supplying recording ink to the recording head, an ink supply port for receiving ink supply from outside, and maintaining a liquid level of the ink reservoir. The air buffer according to any one of the above (1) to (4), further comprising an ink discharge port for discharging ink exceeding a predetermined height.

(6) The recording head includes an electrothermal converter for generating thermal energy for discharging the recording ink, and a film boiling generated in the ink is reduced by the thermal energy applied by the electrothermal heater. The air buffer according to any one of (1) to (5) above, wherein the recording head has a structure in which the recording ink is ejected from the ejection port by utilizing the recording head.

[0015]

The configuration of the present invention as described above can contribute to downsizing of the ink supply container and extension of the life of the pump.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on a plurality of examples with reference to the drawings.

[0017]

FIG. 1 is a schematic sectional view of an ink flow buffer according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an air buffer,
It is connected to the recording head 4 and both are mounted on a scanning carriage (not shown). The air buffer device 1 is sealed, and the ink supply path 2 and the ink discharge path 3 are connected.
Depending on the arrangement position of the end face of the ink supply path 3, the ink storing section 10
Set the liquid level of.

The difference between the internal volume of the air buffer 1 and the internal volume of the ink storage unit 10 is the air storage unit 11. The cross-sectional area of the ink reservoir 10 is reduced when entering the ink reservoir from the upper air reservoir 11, and the volume of the ink reservoir 10 is smaller than the volume of the air reservoir 11. A sufficient air storage volume and a sufficient liquid level for preventing the air from flowing out to the recording head 4 due to the reciprocating movement of the carriage are secured, and the ink storage amount of the ink storage unit 10 can be reduced.

As described above, the air buffer 1 and the recording head 4 reciprocate the carriage for printing.
The recording ink in the connected ink supply path 2 and ink discharge path 3 also follows, but due to the air elasticity of the air storage section 11, the ink flow pressure change is absorbed and the ink storage section 1 is changed.
The pressure fluctuation is not transmitted to the ink of No. 0 and the ink in the recording head 4, so that stable ink discharge printing from the recording head 4 becomes possible.

FIG. 2 is a schematic sectional view of an ink supply-related device for sending and circulating recording ink to and from the container according to the first embodiment.

Reference numeral 20 denotes an ink supply container, and reference numeral 30 denotes a liquid feed pump, which is connected to an air buffer 1 mounted on a carriage (not shown) by an ink supply path 2 and an ink discharge path 3. The ink in the ink supply container 20 is sent by the liquid supply pump 30 through the ink supply path 2 to the air buffer 1 according to the present embodiment, and after storing a predetermined amount of ink in the ink storage unit, the ink is discharged to the ink discharge path. 3 and ink container 2
Return to 0 and cycle.

In order to secure a predetermined ink storage amount and an air storage volume in the air buffer device 1, when feeding and circulating the ink, the smaller the volume of the ink storage unit is, the smaller the amount of ink required for sending and circulating the ink and the longer the time is. Shortening is possible. At the same time, it is also possible to concurrently reduce the volume of the related container such as the ink container 20.

(Second Embodiment) FIG. 3 is a schematic sectional view of an ink flow buffer according to a second embodiment of the present invention.

The air buffer 1 connected to the ink supply path 2 and the ink discharge path 3 and the recording head 4 are connected to a connection pipe 4.
0 and both are mounted on a carriage (not shown), and reciprocate with the carriage for printing.

At this time, a sufficient volume of the air storing portion 11 for buffering the pressure fluctuation to the recording head 4 due to the ink flow is ensured mainly by the air buffer container and the air flowing out to the recording head 4 by the reciprocating movement of the carriage. The ink reservoir 11 for the purpose of ensuring a sufficient liquid level for prevention is mainly provided in the connection pipe 40, thereby simplifying the shape of the air buffer container 1 and at the same time as the first embodiment. A similar effect can be obtained.

At this time, the dimensions of the connection pipe 40 are equivalent to an inner diameter of 3 mm, in which air stagnation hardly occurs due to adhesion of air to the inner wall of the pipe.
It is appropriate to have both a cross-sectional area of not less than 2 mm2 and a vertical distance of not less than 10 mm in which air is hardly mixed even when the liquid surface sways due to the reciprocation of the carriage. The connection pipe 40 may be a rubber tube or a formed tubular resin flow path member, or it is possible to secure the cross-sectional area and the distance on the side of the recording head member to be connected. May be not necessarily circular.

(Third Embodiment) FIG. 4 is a schematic cross-sectional view of an ink flow buffer device according to a third embodiment, which is composed of an air buffer container having a simple shape and a restraining partition plate which is a separate member. .

The suppression partition plate 50 can reduce the amount of ink while securing a predetermined liquid level in the ink storage unit 10 and can prevent the ink flow in the ink storage unit 10 due to the reciprocation of the carriage (not shown). The ink reservoir 10 is structured so as to be able to suppress the ink supply.
Left and right communication ports 52 are provided for synchronizing the liquid level between the respective rooms of the ink storage section 10 partitioned by the upper and lower communication ports 51 for passing the ink supplied from the ink storage section and the suppression partition plate 50.

In the third embodiment, by appropriately setting the shape and thickness of the partition plate 50, the ink reservoir 10
, A reduction in ink flow, and a simple air buffer container shape can be realized at the same time.

[0031]

As described above, according to the present invention,
It is possible to reduce the amount of ink circulation to maintain the liquid level in the ink reservoir of the ink recording head, and to shorten the time required. When used, the size of related devices such as a pressurizing and depressurizing tank for ink circulation can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an ink flow buffer according to a first embodiment.

FIG. 2 is a schematic configuration diagram of an example of an ink supply-related device according to a first embodiment.

FIG. 3 is a schematic sectional view of an ink flow buffer according to a second embodiment.

FIG. 4 is a schematic sectional view of an ink flow buffer according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air buffer 2 Ink supply path 3 Ink discharge path 4 Recording head 10 Ink storage part 11 Air storage part 20 Ink supply container (ink storage tank) 30 Liquid feed pump 40 Connection pipe 50 Suppression partition plate 51 Vertical communication port 52 Right and left communication mouth

Claims (6)

[Claims]
1. A means for scanning a recording head in a direction intersecting with a conveying direction of a recording medium, an ink storage tank disposed at a portion not affected by the scanning of the recording head, and scanning the recording head. An air buffer fixed to the means, and from the ink storage tank via the air buffer,
An ink jet recording apparatus comprising: means for supplying recording ink to the recording head; wherein the air buffering device includes an upper air reservoir and a lower recording ink reservoir, and a horizontal sectional area of the lower ink reservoir. Is smaller than the horizontal cross-sectional area of the upper air reservoir.
2. The horizontal cross-sectional area of the ink reservoir is:
2. The air buffer device according to claim 1, wherein the distance from the recording head junction to the liquid level of the ink reservoir is 7 mm 2 or more over 10 mm or more.
3. The air buffer device according to claim 1, wherein the ink storage section is mainly formed of a separate tubular member, and is formed by joining with the air storage member.
4. The air buffer device according to claim 1, wherein a suppression plate is formed in the ink storage section in a direction perpendicular to the recording head scanning direction.
5. The air buffer device according to claim 1, further comprising a liquid supply port for supplying recording ink to the recording head, an ink supply port for receiving ink supply from outside, and maintaining a liquid level of the ink reservoir. 5. The air damper according to claim 1, further comprising an ink discharge port for discharging ink exceeding a predetermined height.
6. The recording head includes an electrothermal converter for generating thermal energy for discharging recording ink, and utilizes film boiling generated in the ink by the thermal energy applied by the electrothermal heater. 6. The air buffer according to claim 1, wherein the recording head has a structure for discharging the recording ink from the discharge port.
JP29837698A 1998-10-20 1998-10-20 Air shock absorber Withdrawn JP2000117998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP29837698A JP2000117998A (en) 1998-10-20 1998-10-20 Air shock absorber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP29837698A JP2000117998A (en) 1998-10-20 1998-10-20 Air shock absorber

Publications (1)

Publication Number Publication Date
JP2000117998A true JP2000117998A (en) 2000-04-25

Family

ID=17858900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP29837698A Withdrawn JP2000117998A (en) 1998-10-20 1998-10-20 Air shock absorber

Country Status (1)

Country Link
JP (1) JP2000117998A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7431427B2 (en) 2002-06-13 2008-10-07 Silverbrook Research Pty Ltd Ink supply arrangement with improved ink flows
US7467850B2 (en) 1998-10-16 2008-12-23 Silverbrook Research Pty Ltd Nozzle arrangement for a printhead
US8480222B2 (en) 2009-10-08 2013-07-09 Fujifilm Corporation Droplet ejection head, droplet ejection apparatus, and method of collecting bubbles in droplet ejection head

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7784910B2 (en) 1998-10-16 2010-08-31 Silverbrook Research Pty Ltd Nozzle arrangement incorporating a thermal actuator mechanism with ink ejection paddle
US7467850B2 (en) 1998-10-16 2008-12-23 Silverbrook Research Pty Ltd Nozzle arrangement for a printhead
US7585066B2 (en) 1998-10-16 2009-09-08 Silverbrook Research Pty Ltd Ink supply unit with a baffle arrangement
US7588327B2 (en) 1998-10-16 2009-09-15 Silverbrook Research Pty Ltd Inkjet printer with cartridge connected to platen and printhead assembly
US7740337B2 (en) 1998-10-16 2010-06-22 Silverbrook Research Pty Ltd Pagewidth inkjet printhead incorporating power and data transmission film positioning protuberances
US7753504B2 (en) 1998-10-16 2010-07-13 Silverbrook Research Pty Ltd Printhead and ink supply arrangement suitable for utilization in a print on demand camera system
US7431427B2 (en) 2002-06-13 2008-10-07 Silverbrook Research Pty Ltd Ink supply arrangement with improved ink flows
US8282181B2 (en) 2002-06-13 2012-10-09 Zamtec Limited Method of controlling a control circuit for a micro-electromechanical inkjet nozzle arrangement
US8480222B2 (en) 2009-10-08 2013-07-09 Fujifilm Corporation Droplet ejection head, droplet ejection apparatus, and method of collecting bubbles in droplet ejection head

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A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20060110