JP2001239712A - Image recorder - Google Patents

Image recorder

Info

Publication number
JP2001239712A
JP2001239712A JP2000050813A JP2000050813A JP2001239712A JP 2001239712 A JP2001239712 A JP 2001239712A JP 2000050813 A JP2000050813 A JP 2000050813A JP 2000050813 A JP2000050813 A JP 2000050813A JP 2001239712 A JP2001239712 A JP 2001239712A
Authority
JP
Japan
Prior art keywords
recording
image
recording medium
suction
image recording
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.)
Pending
Application number
JP2000050813A
Other languages
Japanese (ja)
Inventor
Takeaki Shima
丈明 島
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 JP2000050813A priority Critical patent/JP2001239712A/en
Publication of JP2001239712A publication Critical patent/JP2001239712A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an image recorder in which a recording medium S can be prevented from floating or slacking without requiring any special control circuit and high quality image recording can be performed by enhancing carrying accuracy of the recording medium. SOLUTION: In a representative arrangement of the inventive image recorder for recording an image on a recording medium S by scanning it with a carriage 17, the image recorder comprises rollers 4, 5 for carrying the recording medium S, a platen 10 for supporting the recording medium S at a position facing the carriage 17, a hole 10b and a fan 19 for sucking the recording medium S to the platen 10, and a hole 10c and a valve 20 opened to the atmosphere for releasing suction through the suction hole 10b and the suction fan 19 when the carriage 17 is moved to a specified scanning position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image recording apparatus capable of recording a high-quality image with reduced image unevenness without providing a special control circuit.

[0002]

2. Description of the Related Art Conventionally, recording apparatuses provided with various recording methods have been put into practical use. Among them, an ink jet recording method, a thermal recording method, etc. are relatively inexpensive and can be reduced in size and noise. It is widely used from personal use to office use. In an image recording apparatus provided with these recording methods, it is general to perform image recording by relatively driving a recording unit (recording head) and a recording medium in the apparatus.

For example, in an image recording apparatus of a serial scan system using an ink jet recording system or the like, as shown in FIG. 7, a recording medium S sent out by a pickup roller 101 moves in a recording medium transport direction on a platen 102 (arrows). X direction) The carriage 106 carrying the recording head 105 is sandwiched between the transport roller pair 103 and the discharge roller pair 104 on the upstream side and the downstream side, respectively, and the main scanning direction (arrow Y direction) orthogonal to the transport direction of the recording medium S ), Image recording is performed by reciprocating scanning. Then, the recording medium S is fed in a fixed amount by the conveying roller pair 103 and the conveying roller pair 104, and is sequentially recorded. When the recording is completed, the recording medium S is discharged out of the apparatus by the discharging roller pair 104.

[0004] In particular, in order to record a high-quality image such as photographic image quality, a recording medium S and a recording head in a recording section are required.
It is necessary to keep the interval of 105 constant so as to eliminate unevenness in recording, and it is necessary to suppress the lifting and loosening of the recording medium S on the platen 102.

If the recording medium S does not have a water-absorbing layer and has large elongation due to ink suction, elongation occurs in the recording portion after recording, and the recording medium S is loosened in the space between the transport roller pair 103 and the discharge roller pair 104. If the floating amount of the recording medium S (including the thickness of the recording medium) due to the slack becomes larger than the distance between the recording head 105 and the upper surface of the platen 102 in the recording section (usually set to 1 mm or less), the recording medium S There is a possibility that the recording medium S may become dirty or the recording head 105 may be damaged due to contact with the head 105. This is particularly likely to occur when the recording amount is large (the recording medium elongation is large) as in color printing.

Further, the recording medium S may be curled or the like. Simply placing the recording medium S on the platen 102 does not make the recording medium S flat.
The height of the floating portion exceeds the distance between the recording head 105 and the upper surface of the platen 102, which may cause the same situation as described above.

Therefore, conventionally, as a method for solving the above problem, a suction means 107 such as a fan or a pump is provided on the platen 102 in order to bring the recording medium S into close contact with the upper surface of the platen 102 as shown in FIG. Things were being implemented.

[0008] Such an image recording apparatus is configured so that a convex portion caused by the elongation of the sheet (recording medium S) after image formation is caused to penetrate below the sheet supporting surface of the supporting means as a measure against the elongation of the recording medium S. JP-A 8-156351 and
As a countermeasure against curling, the inside of the flow path formed parallel to the sheet conveyance direction is made negative pressure by the suction means, and air flows in the flow path in the sheet conveyance direction or the counter conveyance direction, thereby moving the sheet in the sheet conveyance direction. Japanese Patent Application Laid-Open No. 9-220837, which is configured to suck the inside of the flow path along the path.

In the image recording apparatus in which the platen 102 is provided with a suction means 107 such as a fan or a pump, the recording medium S is sucked by the platen 102.
There is a possibility that the friction between the recording media 02 and the transport amount of the recording medium varies, and image unevenness occurs. As a countermeasure against this, Japanese Patent Application Laid-Open No. 8-156351 proposes that the suction force is reduced when the recording medium is conveyed, and the suction force is increased when the image is recorded.

[0010]

However, the conventional image recording apparatus disclosed in Japanese Patent Application Laid-Open No. 8-156351 requires a relatively thick recording medium S, requires a strong suction force, and has a relatively high recording speed. In such a case, there is a possibility that it is not possible to cope with the negative pressure change at the time of recording and at the time of conveying the recording medium. In addition, a control circuit for the suction means is required, and the control is complicated.

Accordingly, the present invention provides an image recording apparatus capable of preventing floating and loosening of a recording medium S without requiring a special control circuit, increasing the recording medium conveyance accuracy, and performing high-quality image recording. The purpose is to provide.

[0012]

In order to solve the above-mentioned problems, a typical configuration of an image recording apparatus according to the present invention is an image recording apparatus which scans recording means to record an image on the recording medium. Conveying means for carrying, and supporting means for supporting a recording medium at a position facing the recording means,
A suction means for adsorbing the recording medium on the support means and a release means for releasing the suction by the suction means when the recording means is scanned to a predetermined position are provided.

[0013]

[First Embodiment] A first embodiment of an image recording apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a schematic configuration of an image recording apparatus according to the first embodiment, and FIG. 2 is a perspective view of the image recording apparatus. The image recording apparatus according to the present embodiment is an inkjet-type image recording apparatus capable of performing full-color image recording.

As shown in FIG. 1, at the bottom of the image recording apparatus, a cassette 1 capable of loading and storing recording media of various sizes is detachably mounted. Only the uppermost sheet of the recording medium S loaded on the cassette 1 is fed by the pickup roller 2 between the recording medium guides 3a and 3b.

The pickup roller 2 has a cam shape and feeds the leading end of the recording medium S to the nip portion of the conveying rollers 4 and 5 which are conveying means for conveying the recording medium S, and separates the recording medium S from the recording medium S. Lose the transfer power.

The transport roller 4 is provided at one end of a pressure plate 7 having a shaft 6 as a fulcrum. The transport roller 4 is pressed by the transport roller 5 by contraction of a spring 8 provided at the other end, and rotates the transport roller 5 which is driven and rotated. It is designed to rotate in accordance with.
The conveyance roller 5 starts rotating when the sensor 9 detects the leading end of the recording medium S.

Discharge rollers 11 and 12 are provided on the downstream side of the platen 10 as support means for supporting the recording medium S at a position facing the recording means. The incoming recording medium S is pinched and discharged.

The discharge roller 11 is a pressure plate having a shaft 13 as a fulcrum.
A discharge roller that is provided at one end of 14 and is driven and rotated by the discharge roller 12 by contraction of a spring 15 provided at the other end.
It rotates according to the rotation of twelve.

Since the peripheral speed of the discharge roller 12 is set to be several percent higher than the peripheral speed of the transport roller 5, the recording medium S on the platen 10 An appropriate tension is always applied in the direction (the direction of the arrow X) so as not to loosen.

A guide shaft 16a is provided above the platen 10 in a main scanning direction (direction of arrow Y) orthogonal to the conveying direction.
A carriage 17 that can be scanned by driving means (not shown) is provided along 16b. The carriage 17 has a recording medium S
This is a recording means for recording an image on a recording medium, and has a recording head 18 mounted thereon.

As shown in FIG. 2, the recording head 18 is an ink-jet recording head that performs recording by discharging ink in accordance with a signal. In order to perform full-color image recording, cyan (C) and magenta ( M), yellow (Y) and black (B) recording heads 18C, 18M, 18Y and 18
B are arranged side by side in the scanning direction.

The transport rollers 4 and 5, the discharge rollers 11 and 12, and the guide shafts 16a and 16b are mounted on the image recording apparatus side plates 25 and 27 (see FIGS. 3 to 5) and positioned.

Next, image recording will be described in detail.
3 is a cross-sectional view showing a schematic configuration around the image recording unit in the first state, FIG. 4 is a cross-sectional view showing a schematic configuration around the image recording unit in the second state, and FIG. 5 is an image recording in the third state. It is sectional drawing which shows schematic structure of a part periphery.

The platen 10 has a plurality of suction holes 10b as suction means for sucking the recording medium S on the upper surface supporting the recording medium S, and releases the suction by the suction means on the side surface on the side of the image recording apparatus side plate 25. It has an atmosphere opening hole 10c as a releasing means, and the suction hole 10b and the atmosphere opening hole 10c penetrate through the internal space 10a of the platen 10. Further, a suction fan 19, which is a suction unit of a suction unit for sucking the recording medium S, is provided below the platen 10, and exhausts the internal space 10a. The suction means is not limited to the suction fan 19, but may be any suction means such as a suction pump for exhausting the internal space 10a.

The air release valve 20, which is a releasing means for releasing the suction by the suction means, is rotatably mounted by fitting a shaft 21 into a hole 26a of a hinge 26 provided on the side plate 25 of the image recording apparatus. , A projection 22 and a cap 23 for closing the air opening hole 10c. The protruding portion 22 is formed through a hole 25 a formed in the
Protrudes out of the recording range within the scanning range. Cap part
Reference numeral 23 is formed of a soft material such as rubber, and is urged to be in close contact with the side surface of the platen 10 by a cap spring 24 provided between the plate 23 and the image recording apparatus side plate 25.

In the image recording in the image recording section A, when the carriage 17 is scanned to a position outside the image recording range and in contact with the image recording apparatus side plate 25, the air release valve 20 is opened and the air is released to the first state (FIG. 3), a second state in which the air release valve 20 is closed before the carriage 17 scans in the image recording range (see FIG. 4), and a state in which the carriage 17 is in the image recording range and the air release valve 20 is closed. Third state (see Fig. 5)
It is composed of

As shown in FIG. 3, in the first state,
When the carriage 17 scans to a position where the carriage 17 comes into contact with the image recording apparatus side plate 25, the projection 22 is pressed, the cap 23 is separated from the side surface of the platen 10, and the air opening hole 10c is opened. Then, the internal space 10a is suctioned and rapidly approaches the atmospheric pressure, and the suction force of the suction hole 10b is almost eliminated. Thereby, the suction of the recording medium S can be rapidly released,
The recording medium S is conveyed without resistance by the conveying rollers 4 and 5, and the conveyance accuracy of the recording medium S can be improved by suppressing the variation in the conveyance amount.

As shown in FIG. 4, in the second state,
After the carriage 17 completes the conveyance of the recording medium S for one pulse, the carriage 17 slightly scans from the image recording apparatus side plate 25 for the next recording. At this time, the recording head 18 has not yet scanned the recording medium S. Also, since the carriage 17 is separated from the projection 22, the air release valve 20 is
Close to the side of the platen 10 due to the urging force of
blocking c. In this state, the suction fan 19 is
By exhausting the gas a, a negative pressure is generated in the suction hole 10b, and the recording medium S is sucked on the upper surface of the platen 10. The carriage 17 waits for a predetermined time so that the recording medium S is sufficiently sucked.

As shown in FIG. 5, in the third state,
After waiting for a predetermined time in the state shown in FIG.
Scanning is performed toward the image recording apparatus side plate 27, and ink is ejected from the recording head 18 onto the recording medium S in accordance with an image signal to record an image. When recording is started, the recording medium S is sufficiently adsorbed to the platen 10, so that the occurrence of image unevenness can be suppressed.

After recording to the image recording device side plate 27 side of the image recording range of the recording medium S, the carriage 17 scans the image recording device side plate 25 and returns to the state of FIG. 3, and the recording medium S is conveyed by one pulse. I do. By repeating such an operation, image unevenness due to conveyance to the recording medium S and the recording medium S
It is possible to form a high-quality image in which image unevenness due to floating or looseness of the image is suppressed.

Further, since the air release valve 20 and the carriage 17 are mechanically linked, a high-quality image can be formed without providing a special control circuit.

In the present embodiment, the ink is ejected by energizing the electrothermal transducer in response to a recording signal and utilizing the film boiling caused by the thermal energy to grow and shrink bubbles generated in the ink. The recording is performed by discharging the ink from the discharge port. Regarding the typical configuration and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4,740,796.

This method can be applied to any of the so-called on-demand type and continuous type. Particularly, in the case of the on-demand type, the recording medium S holding the ink is used.
By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise exceeding nucleate boiling to the electrothermal transducer arranged corresponding to the fluid path, This is effective because it generates thermal energy and causes film boiling on the heat-acting surface of the recording head, so that bubbles in the liquid corresponding to this drive signal one-to-one can be formed. The ink is ejected through the ejection opening by the growth and contraction of the bubble to form at least one droplet. When the drive signal is formed into a pulse shape, the growth and shrinkage of the bubble are performed immediately and appropriately, so that particularly excellent liquid ejection can be achieved, which is more preferable.

Second Embodiment Next, a second embodiment of the image recording apparatus according to the present invention will be described with reference to the drawings. FIG.
FIG. 3 is a cross-sectional view illustrating a schematic configuration around an image recording unit according to the embodiment. Portions having the same functions as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 6, the image recording apparatus according to the present embodiment is the same as the image recording apparatus side plate according to the first embodiment.
An image recording apparatus side plate 50 is provided instead of 27, and an air release valve 51 and an air release hole 10d are added.

An air release valve 51, which is a releasing means for releasing the suction by the suction means, is rotatably mounted by fitting a shaft 52 into a hole (not shown) of a hinge portion 53 provided on the image recording apparatus side plate 50. A projection 54 and a cap 55 for closing the air opening hole 10d are provided. Projection 54
Protrudes out of a recording range within the scanning range of the carriage 17 from a hole 50a provided in the image recording apparatus side plate 50. The cap portion 55 is formed of a soft material such as rubber, and is urged by a cap spring 56 provided between the cap portion 55 and the image recording device side plate 50 so as to be in close contact with the side surface of the platen 10 on the image recording device side plate 50 side. Have been.

With such a configuration, in addition to one-way recording performed when the carriage 17 scans from the image recording device side plate 25 to the image recording device side plate 27, the carriage 17 is moved from the image recording device side plate 50. Recording can also be performed when scanning the image recording device side plate 25, and bidirectional recording can be performed. Further, the carriage 17 is a side plate 25 of the image recording apparatus,
The recording medium S can be transported at both end positions on the 50 side.
For this reason, the image recording time can be significantly reduced.

Although the description has been given of the case where the ink jet recording means is used as the recording means, the present invention may be applied to a recording apparatus having a thermal head equipped with a thermal head or a thermal transfer recording method as another constitution. It is possible.

[0039]

As described above, when the recording means is scanned to a predetermined position, the releasing means for releasing the suction of the suction means in mechanical cooperation with the recording means is provided. Thus, the suction of the recording medium can be rapidly released. In addition, the recording medium is conveyed without resistance, and the conveyance accuracy of the recording medium can be improved by suppressing the variation in the conveyance amount. Further, a high-quality image with reduced image unevenness can be recorded without providing a special control circuit.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic configuration of an image recording apparatus according to a first embodiment.

FIG. 2 is a perspective view illustrating a schematic configuration around an image recording unit.

FIG. 3 is a cross-sectional view illustrating a schematic configuration around an image recording unit in a first state.

FIG. 4 is a cross-sectional view illustrating a schematic configuration around an image recording unit in a second state.

FIG. 5 is a cross-sectional view illustrating a schematic configuration around an image recording unit in a third state.

FIG. 6 is a cross-sectional view illustrating a schematic configuration around an image recording unit according to a second embodiment.

FIG. 7 is a cross-sectional view illustrating a schematic configuration of a conventional image recording apparatus.

FIG. 8 is a perspective view illustrating a schematic configuration around an image recording unit.

[Explanation of symbols]

 S ... recording medium 1 ... cassette 2 ... pickup roller 3a, 3b ... recording medium guide 4, 5 ... transport roller 6 ... shaft 7 ... pressure plate 8 ... spring 9 ... sensor 10 ... platen 10a ... internal space 10b ... suction hole 10c. 10d ... air release holes 11, 12 ... discharge roller 13 ... shaft 14 ... pressure plate 15 ... springs 16a, 16b ... guide shaft 17 ... carriages 18, 18B, 18C, 18M, 18Y ... recording head 19 ... suction fans 20, 51 ... Atmospheric release valve 21, 52… Shaft 22, 54… Protrusion 23, 55… Cap part 24, 56… Cap spring 25, 27, 50… Image recording device side plate 25a, 50a… Hole 26, 53… Hinge part 26a… hole

Claims (6)

    [Claims]
  1. An image recording apparatus that scans a recording unit to record an image on a recording medium, comprising: a conveying unit that conveys the recording medium; a supporting unit that supports the recording medium at a position facing the recording unit; An image recording apparatus, comprising: suction means for sucking a recording medium on a support means; and releasing means for releasing suction by the suction means when the recording means is scanned to a predetermined position.
  2. 2. The apparatus according to claim 1, wherein the suction unit includes a plurality of suction holes for suctioning a recording medium on an upper surface of the support unit that supports the recording medium;
    2. An image according to claim 1, wherein said suction means is a suction means for generating a negative pressure in said suction hole, and said release means is an air release hole and an air release valve for releasing the negative pressure generated in said suction hole to the atmosphere. Recording device.
  3. 3. The image recording apparatus according to claim 2, wherein the air release valve can be brought into contact with the recording means, and can be opened and closed in conjunction with scanning of the recording means.
  4. 4. A first state in which the air release valve is opened to open to the atmosphere when the recording unit is scanned to a predetermined position outside the image recording range, and at least the recording unit scans within the image recording range. The air release valve and the recording means are mechanically arranged so that the second state is that the air release valve is closed before the air release valve is closed, and the third state is that the air release valve is closed within the image recording range. 3. The image recording apparatus according to claim 2, wherein the image recording apparatus is interlocked.
  5. 5. The recording medium is conveyed by the conveying means in the first state, the recording means waits for a predetermined time in the second state, and performs image recording in the third state. The image recording device according to claim 4.
  6. 6. The image recording apparatus according to claim 1, wherein the recording means supplies a current to the electrothermal transducer in response to a signal, and discharges the ink using thermal energy generated by the electrothermal transducer. 2. The recording device according to 1.
JP2000050813A 2000-02-28 2000-02-28 Image recorder Pending JP2001239712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000050813A JP2001239712A (en) 2000-02-28 2000-02-28 Image recorder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000050813A JP2001239712A (en) 2000-02-28 2000-02-28 Image recorder

Publications (1)

Publication Number Publication Date
JP2001239712A true JP2001239712A (en) 2001-09-04

Family

ID=18572561

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000050813A Pending JP2001239712A (en) 2000-02-28 2000-02-28 Image recorder

Country Status (1)

Country Link
JP (1) JP2001239712A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100417526C (en) * 2003-03-07 2008-09-10 精工爱普生株式会社 Medium transmitting device and recording equipment
US20090219372A1 (en) * 2008-02-28 2009-09-03 Brother Kogyo Kabushiki Kaisha Recording apparatus
US8141976B2 (en) 2008-05-08 2012-03-27 Seiko Epson Corporation Printing control method for a serial inkjet printer, and a serial inkjet printer
CN103507435A (en) * 2013-09-24 2014-01-15 新疆东港安全印刷有限公司 Anti-counterfeit printing processing device special for bills
EP3427961A1 (en) 2017-07-14 2019-01-16 OCE Holding B.V. Method of ink jet printing on porous media

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100417526C (en) * 2003-03-07 2008-09-10 精工爱普生株式会社 Medium transmitting device and recording equipment
US20090219372A1 (en) * 2008-02-28 2009-09-03 Brother Kogyo Kabushiki Kaisha Recording apparatus
US8123348B2 (en) * 2008-02-28 2012-02-28 Brother Kogyo Kabushiki Kaisha Recording apparatus
US8141976B2 (en) 2008-05-08 2012-03-27 Seiko Epson Corporation Printing control method for a serial inkjet printer, and a serial inkjet printer
CN103507435A (en) * 2013-09-24 2014-01-15 新疆东港安全印刷有限公司 Anti-counterfeit printing processing device special for bills
EP3427961A1 (en) 2017-07-14 2019-01-16 OCE Holding B.V. Method of ink jet printing on porous media

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