JP3143092B2 - Ink jet recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ink sheet recording apparatus for recording an image on a recording sheet such as paper or a plastic sheet.

[0002]

2. Description of the Related Art Generally, an image recording apparatus having a recording mechanism of an ink jet system, a thermal transfer recording mechanism, or the like performs a recording operation while scanning the recording mechanism relative to a sheet material such as paper. To obtain a two-dimensional image.

FIG. 4 shows a conventional example of an ink jet recording apparatus which is one of the above image recording apparatuses. In this configuration, a recording sheet is intermittently fed in a predetermined direction by a conveyance roller mechanism, and an ink jet mechanism as a recording unit is scanned in a direction perpendicular to the direction. The sheet 1 is conveyed in the direction of arrow A by a sheet supply mechanism (not shown), and is guided between the upper guide 11 and the lower guide 12. The upper guide 11 and the lower guide 12 are supported by a bottom plate 102 which forms a part of the apparatus main body.

Further, the sheet 1 enters a joining portion between the sub-scanning roller 13 and the sub-scanning driven roller 14 supported by the bearings 31 and 32. By rotation of both rollers, the sheet 1 becomes the bottom plate 1
02 while being supported by the platen 19 fixed to 02
The sheet enters the joint between the discharge roller 20 and the discharge driven roller 21 supported by 34. The discharge guide 24 is supported by the bottom plate 102, and guides the discharge direction of the recording sheet 1 conveyed in the direction of arrow A to the outside of the apparatus main body by the rotation of the discharge roller 20 and the discharge driven roller 21.

[0005] A left side plate 103 and a right side plate 104 having vertical surfaces are fixed to the left and right sides of the bottom plate 102. The bearing portions 31 and 33 are supported by the left side plate 103, and the bearing portions 32 and 34 are supported by the right side plate 104.
And the right side plate 104. The transport motor 17 for applying a rotational driving force to the sub-scanning roller 13 and the discharge roller 20 is fixed to the left side plate 103 via a motor stopper 26.

A sub-scanning roller 13 is located above the platen 19 at the back.
The main scanning rail 6 arranged in parallel with the axial direction of FIG. The carriage 7 is inserted into the main scanning rail 6 and is movable in the axial direction of the main scanning rail 6 by the main scanning motor 2 fixed above the left side plate 103.

The carriage 7 has ink cartridges (black 8Bk, cyan 8C, magenta 8M, yellow 8Y) having four colors of ink attached at predetermined positions. Each ink cartridge 8 holds an ink jet recording head in which a plurality of nozzles (not shown) are arranged on the lower side in a direction perpendicular to the moving direction of the carriage 7, and ink is passed through an opening at the lower part of the carriage. Discharge can be performed toward the platen 19 side.

When the carriage 7 is in a standby state before recording at a position indicated by a one-dot chain line on the right side of FIG. 4, that is, at a so-called home position, a nozzle held by each ink cartridge 8 at the time of image recording is located immediately below the carriage 7. A recovery unit 9 for maintaining the device in a good state and for recovering it to a good state is fixed to a bottom plate 102 constituting the apparatus main body.

In the recording operation, when the carriage 7 scans the recording sheet 1 supported on the platen 19 by the main scanning motor 2, the nozzles held in the ink cartridges 8 eject ink toward the recording sheet 1. Done by

Each time the carriage 7 scans and records the recording sheet 1, the sub-scanning roller 13 and the sub-scanning driven roller
The carriage 7 is fed by a predetermined amount in a direction perpendicular to the scanning direction of the carriage 7 by the discharge roller 20 and the discharge driven roller 21. Thus, a two-dimensional image is obtained.

[0011]

However, in the conventional ink jet recording apparatus as described above, since parts related to image recording are dispersedly mounted on each part at the bottom of the apparatus main body, each of the members of the conveying means is not provided. It is difficult to obtain high precision in the relative positional relationship, and there is a problem as described below.

(1) Due to poor positional accuracy between the moving force applying member for applying the moving force to the sheet material such as each roller pair and the conveying path guide member or the recording sheet support member, the conveying direction of the recording sheet is limited by its width. It tends to be non-uniform in the direction, and liable to cause transport failures such as skew, corner breaks, and catching.

(2) The non-uniformity in the transport direction during the movement, that is, the non-uniformity of the velocity vector component in the specific direction, makes the transport amount non-uniform. In particular, if the recording sheet has the non-uniformity in the plane above the support member of the recording sheet in the image recording portion, the recording sheet is loosened or stretched,
When an image is recorded there, the image is distorted due to slack or tension, and furthermore, it is impossible to carry out a predetermined amount of accurate conveyance, so that image density unevenness or streaks in the conveyance direction occurs on the image. , Lowering the image quality.

(3) Since the main parts of the image recording area are concentrated in the lower part of the main body of the ink jet recording apparatus and relatively inside, the assembling workability is extremely poor when assembling the parts.

(4) If the recording sheet has a conveyance failure near the image recording portion, the recording sheet is located at the lower part of the main body of the recording apparatus and relatively inside, so that the recording sheet can be easily removed. Absent.

The present invention solves the above problems,
The objective is to configure the main members involved in the conveyance of the recording sheet and the holding means of the recording head to be able to accurately position each other, stabilize the conveyance of the recording sheet and improve the image quality of the recorded image, Another object of the present invention is to provide an ink jet recording apparatus capable of improving the assemblability of the members and the processability of the recording sheet after the conveyance failure.

[0017]

A typical configuration according to the present invention for achieving the above object is an ink jet recording apparatus for performing ink jet recording on a recording sheet using an ink jet recording head disposed in a housing. A plurality of transport rollers for transporting the recording sheet, respective bearings of the plurality of transport rollers, a platen, and a predetermined interval with respect to the recording sheet guided by the plurality of transport rollers. A head holding means for holding the ink jet recording head at a distance / opposition, a base on which the relative positional relationship is maintained, and a base which is housed in the housing and is provided on the recording sheet. A recording position where ink jet recording is possible, and a removal position where the base can be removed from the ink jet recording apparatus outside the housing, It characterized by having a a base support means for movably supporting the base.

In the above construction, since the bearings of the rollers are supported by the same base, the joints of the rollers, the height of the platen surface, and the means for holding the ink jet recording head are precisely defined. It is also possible to precisely define the degree of parallelism between the joints of the rollers and incorporate them into the apparatus body.

[0019]

Next, an embodiment of the present invention to which the above-mentioned means is applied will be described with reference to FIGS.

Here, first, a reference embodiment will be described with reference to FIGS. 1 and 2, and further, an embodiment according to the present invention will be described with reference to FIG. 1 is an explanatory perspective view of a main part of the ink jet recording apparatus, FIG.
FIG. 3 is an explanatory diagram of the embodiment according to the present invention.

In the reference embodiment shown in FIG. 1, a recording sheet is intermittently fed in a predetermined direction by a conveying roller mechanism for applying a conveying force to the recording sheet by a conveying roller at a recording portion. The ink jet mechanism as a recording means is scanned in the direction.

The sub-scanning roller 13 and the sub-scanning driven roller 14 are
Bearings 31, whose axial ends are fixed to the base 25,
The recording sheet 1 which is rotatably supported by the rollers 32 can be conveyed rightward by the rotation of both rollers.

A platen 19 supporting the conveyed recording sheet 1 is fixed to a base 25 on the side of the sub-scanning roller 13 in the conveying direction. Further, on the transport direction side with respect to the platen 19, a discharge roller 20 and a discharge driven roller 21 pressed toward the roller 20 are disposed. Both ends in the axial direction of the discharge roller 20 and the discharge driven roller 21 are rotatably supported by bearings 33 and 34 fixed to the base 25. Since the bearing portion of each roller is supported by the same base 25, a joint between the sub-scanning roller 13 and the sub-scanning driven roller 14,
Upper surface of platen 19, discharge roller 20 and discharge driven roller
The height of the joint with the sub-scanning roller 13 and the joint with the discharge roller 20 can be accurately defined.

The upper guide 11 and the lower guide supported by the base 25
Reference numeral 12 denotes a recording sheet 1 which is driven by a sub-scanning roller 13 and a sub-scanning driven roller.
This is for guiding to the junction with the sub-scanning roller 13
Since it is supported by the same base 25 as the bearing portion 31, the positional relationship between the two can be accurately defined. Discharge guide
Reference numeral 24 denotes a unit for guiding the recording sheet 1 carried out by the discharge roller 20 and the discharge driven roller 21 to the outside of the casing of the apparatus main body 101.

A sub-scanning pulley 15 is fixed to a left end of the sub-scanning roller 13 in FIG. 1, and a discharge pulley 22 is fixed to a left-side end of the discharge roller 20 in FIG. On the other hand, the transport motor 17 is fixed to the base 25 via a motor stopper 26 at the lower left portion of the base 25. A transport motor pulley 17 is fixed to a rotation shaft of the transport motor 17, and transmits a rotational driving force to the sub-scanning pulley 15 and the discharge pulley 22 via the sub-scanning belt 16 and the discharge belt 23. At this time, the diameter of the discharge pulley 22 depends on the conveying speed of the discharge roller 20 and the sub-scanning roller 13.
Is set to be slightly faster than the transfer speed of the above.
Further, the gripping force on the sub-scanning roller 13 side with respect to the recording sheet 1 is set to be stronger than the gripping force on the discharge roller 20 side. The recording sheet 1 does not slack on the platen 19.

On the upper left side of the platen 19, the sub-scan roller 13
The main scanning rail 6 arranged in parallel with the axial direction of the
Fixed to 101. The main scanning rail 6 is inserted into a bearing 7A of the carriage 7 as head holding means for holding the ink jet recording head.
(In the directions of arrows B and C in FIG. 1).
The main scanning motor 2 is disposed above the left side of the main scanning rail 6 and is fixed to a side plate of the apparatus main body 101. Main scanning motor 2
The main scanning motor pulley 3 is fixed to the rotating shaft of
It can rotate integrally with the rotating shaft. The idler pulley 5 is moved in the direction indicated by an arrow B in FIG.
The positions are opposed to each other, and are rotatably supported by side plates of the apparatus main body 101.

The main scanning belt 4 is a main scanning motor pulley 3
Between the main scanning motor 2 and the idler pulley 5
Is driven with the rotation of. The main scanning belt 4 and the carriage 7 are connected between the pulleys 3 and 5, and the carriage 7 is driven in the arrow B direction or the arrow C direction by rotation of the main scanning motor 2. A roller 7B rotatably supported is disposed below the carriage 7 (see FIG. 2), and rolls on the recording sheet 1 supported by a platen shaft to thereby provide a space between the carriage 7 and the recording sheet 1 in the height direction. Is defined.

The carriage 7 has four ink cartridges 8 each having different color inks fixed at predetermined positions. These are a black ink cartridge 8Bk, a cyan ink cartridge 8C, a magenta ink cartridge 8M, and a yellow ink cartridge 8Y. Platen at the bottom of each ink cartridge 8
At a position opposed to 19, as shown in FIG. 2, an ink jet recording head 8A composed of a plurality of nozzles arranged in a direction perpendicular to the moving direction of the carriage 7 and a mechanism for applying ink ejection force thereto. Holding. Each of the ink jet recording heads 8A can discharge ink dots from the ink in the ink cartridge toward the recording sheet 1 supported on the platen 19. The ink jet recording head 8A has various types of energy for ejecting the ink. In the reference embodiment, a means for generating thermal energy (for example, an electrothermal converter or a laser beam) is provided, and the state of the ink is changed by the thermal energy. Is used. According to this method,
This is because higher density and higher definition of recording can be achieved.

When the carriage 7 and the ink cartridges 8Y, 8M, 8C, 8Bk, etc. loaded thereon do not perform the image recording operation, the carriage 7 is controlled by the drive of the main scanning motor 2 so that the ink cartridges 8Y, 8M ,
It is possible to move together with 8C and 8Bk to the position shown by the solid line in FIG. 1 which is outside the recording area. When the carriage 7 is at the above position, in order to prevent clogging due to drying inside each nozzle, a cap as a cap member for sealing the nozzle of each ink jet recording head 8A so as to keep the inside of the nozzle wet. 10Y, 10M, 10C, and 10Bk are arranged on the base 25.

A recovery unit 9 is disposed on the base 25 behind the caps 10Y, 10M, 10C, and 10Bk to perform a recovery process for recovering more than the ejection of ink due to unnecessary bubbles or impurities generated inside each nozzle. Have been. Inside the recovery unit 9, there is a built-in suction pump that reduces the pressure inside each cap 10Y, 10M, 10C, 10Bk, sucks unnecessary bubbles and impurities inside each nozzle together with ink, and removes them from inside the nozzle. are doing. The suction pump has a mechanism for converting the rotational driving force into a negative pressure, and obtains the rotational driving force of the sub-scanning roller 13 through the gears 41 and 42 to obtain the driving force of the pump.

In the reference embodiment, the transport rollers, the transport motor, and the like are configured to be displaceable by a displacement means to a position where they can be attached to and detached from the apparatus main body. Main unit 101
On the discharge side of the slide rail 35 as a base supporting means that can expand and contract on the left and right sides as viewed from the discharge side, and a slide rail
Each end of 36 is attached. On the other hand, the other end of the slide rail 35 has engagement holes 43 and 44,
At the other end, there are engaging holes 45, 46 (not shown) at symmetrical positions of the engaging holes 43, 44. At the lower part on both sides of the base 25, engaging pins 47 and 48 for engaging with these engaging holes 43, 44, 45 and 46 and engaging pins 49 and 50 (not shown) are fixed. With this, the recording sheet is guided to a position where the base 25 is separated from and opposed to the ink jet recording head at a predetermined interval by a plurality of rollers together with the sliding operation of the slide rails 35 and 36, thereby enabling ink jet recording on the recording sheet. The base can be moved to a recording position and a detachable position outside the housing where the base can be detached from the ink jet recording apparatus.

The upper guide 11, the lower guide 12, the discharge guide 24,
Bearings (31, 32, 33, 34), platen 19, transport motor 1
7. The base 25 to which the recovery unit 9 and the like are fixed is supported by these two slide rails 35 and 36,
With 37 it is possible to withdraw in the discharge direction. After being pulled out, the base 25 can be removed from the slide rail by removing the engagement between the engagement pins 47, 48 and the engagement pins 49, 50 (not shown) from the engagement holes 43, 44, 45, 46. .

The recording operation is as follows. The recording sheet 1 is transported in the direction of arrow A by a sheet transport mechanism (not shown), and is inserted between the upper guide 11 and the lower guide 12 fixed to the base 25. Further, the recording sheet 1 is guided in the traveling direction by the two guides 11 and 12, and enters the joining portion between the sub-scanning roller 13 and the sub-scanning driven roller 14. Both guides 11, 12
The positional relationship between the recording sheet 1 and the sub-scanning roller 13 and the sub-scanning driven roller 14 is precisely defined, so that the recording sheet 1 reaches the joining portion accurately. When the transport motor 17 is driven and controlled, the sub-scanning roller 13 and the sub-scanning driven roller 14 rotate, the recording sheet 1 is carried out onto the platen 19, and further reaches the joining portion of the discharge roller 20 and the discharge driven roller 21. Here, the transport roller temporarily stops.

The height of the joint between the sub-scanning roller 13 and the sub-scanning driven roller 14, the upper surface of the platen 19, and the junction between the discharge roller 20 and the discharge driven roller 21 are precisely defined. Since the parallelism between the joint on the side of the roller 13 and the joint on the side of the discharge roller 20 is also precisely defined, the recording sheet 1 performs an accurate conveyance by obtaining a uniform conveyance direction and conveyance speed in the width direction. I can do it. Therefore, the recording sheet 1 does not slack on the platen 19, and a conveyance failure hardly occurs.

Next, when the main scanning motor 3 is driven and controlled, the carriage 7 starts to move in the direction of arrow C in FIG. 1. During this movement, an ink discharge signal corresponding to the image is output from the main body control unit. Each cartridge 8Y, 8M, 8C,
The ink is supplied to the 8Bk inkjet recording head 8A, and ink is ejected to the recording sheet 1 on the platen 19,
An image having a predetermined width is formed. Then, the main scanning motor 2
Is driven in reverse, the carriage 7 moves in the direction of arrow B,
It reaches outside the image forming area. Thereafter, the recording sheet 1 is repeatedly intermittently fed, and each time, the scanning drive of the carriage 7 and the ink discharge operation of each ink jet recording head 8A are repeated to obtain a two-dimensional image.

In order to assemble the main members in the recording portion related to the conveyance of the recording sheet 1, after assembling on the base 25 in advance, the base 25 is pushed and slid with the handle 37, and
The rear surface of the base 25 may be positioned by abutting against the stop plates 27 and 28.
It has been maintained above. If the recording sheet 1 has a conveyance failure near the image recording area, if the base 25 is pulled out with the handle 37, the conveyance failure sheet can be pulled out together, so that the processing can be easily performed.

In the above configuration, since the transport motor 17 and the drive transmission system are integrally formed with the sub-scanning roller 13 and the discharge roller 20, the tension caused by the attachment and detachment of the sub-scanning belt 16, the discharge belt 23, and the like. There is no change, and the drive response is stable. Therefore, the transport movement amount is constant, and the image quality is improved.

Next, an embodiment according to the present invention will be described with reference to FIG. In this embodiment, a recording means for acting on a recording sheet at a recording portion and a conveying means for giving a predetermined moving amount to the recording sheet are integrally detachable from a recording apparatus main body. .

The transport means is the same as that of the above-described reference embodiment, and the description of the relevant portions will be omitted.

On the right side and the left side of the base 25, a right side plate 51 and a left side plate 52 having a plane perpendicular to the main plane of the base 25 are fixed while maintaining the mutual positional relationship with high precision. Platen 19
The main scanning rail 6 is disposed on the upper left side in parallel with the axial direction of the sub-scanning roller 13, and both ends thereof are supported by a right side plate 51 and a left side plate 52. The main scanning rail 6 is inserted through a bearing portion 7A of the carriage 7 as a head holding means,
It is movable in the axial direction of the main scanning rail 6 (in the directions of arrows B and C). The main scanning motor 2 is arranged above the left end of the main scanning rail 6, and the main scanning motor pulley 3 is fixed to the rotating shaft, and can rotate integrally with the rotating shaft.

The idler pulley 5 is a main scanning motor pulley 3
And the right side plate 51
Are rotatably supported. The main scanning belt 4 is hung between the main scanning motor pulley 3 and the idler pulley 5, and is driven to rotate with the rotation of the main scanning motor 2. One portion of the main scanning belt 4 and the rear surface of the carriage 7 are connected between the pulleys, and the carriage 7 is driven in the arrow A direction or the arrow B direction by rotation of the main scanning motor 2. You. Internal configuration of the carriage 7,
The configuration of the ink cartridge 8 mounted thereon is the same as that of the above-described reference embodiment.

Behind the carriage 7, there is a flat cable 53 for transmitting an ink discharge signal from the main body control unit to the ink jet recording head to the ink jet recording head. It is integrally supported. Flat cable
Numeral 53 has a bent portion 53A having an appropriate slack so as to absorb a change in the distance between the carriage 7 and the main body control section when the carriage 7 is moved for scanning or comes off the image recording apparatus main body.

The positional relationship between the caps 10Y, 10M, 10C, 10Bk and the recovery unit 9 is the same as in the reference embodiment. Slide rails 35 and 36, which can be extended and contracted in the axial direction, are fixed to the lower left and lower right portions of the base 25, respectively. On the other hand, the other ends of the slide rails 35 and 36 are supported by the apparatus main body. The right side plate 51 and the left side plate 52 have facing surfaces 51A and 52A facing the inside (left side) of the apparatus main body.
Positioning pins 55, 56 protruding toward the inside of the apparatus main body are fixed to the facing surfaces 51A, 52A, respectively. on the other hand,
A fitting member 64 having a positioning fitting hole 63 at a position facing the positioning pin 56 is fixed to the main body front side plate 61 of the apparatus main body. Similarly, a fitting member 66 having a positioning fitting hole 65 is fixed to the main body rear side plate 62 at a position facing the positioning pin 55. A handle 37 is fixed to the front center of the base 25, and can move integrally with the base 25.

At the time of assembling, after assembling the parts on the base 25 in advance, the operator pushes the base 25 into the apparatus main body with the handle 37 so that the base 25 is
It moves smoothly in accordance with 35 and 36, and is finally positioned by fitting the positioning pins 55 and 56 and the positioning fitting holes 63 and 65 in the directions of arrows B and C, and facing in the directions of arrows A and D. Positioning is performed by abutment between the surfaces 51A, 52A and the fitting members 64, 66. Further, when a maintenance and inspection work becomes necessary, by performing an operation reverse to the above work, the recording system is detached from the apparatus main body.

According to the above configuration example, since the main scanning system and the sub-scanning system are integrated, the stabilization of the conveying means and the
The positional relationship between the recording means and the transport means can be accurately determined. Therefore, since the parallelism between the scanning movement trajectory surface of the inkjet recording head 8A and the upper surface of the platen 19 and an appropriate distance between the two can be maintained, the variation in the ejection direction of the ejection ink is minimized, and The accuracy of the positions of the ink dots can be improved. In addition, since the perpendicularity between the main scanning direction and the sub-scanning direction is easily maintained, the perpendicularity accuracy between the recording sheet 1 and the image is improved.

[Other Embodiments] In the above-described embodiment, the ink jet recording system is used as the recording means. However, an electric current is supplied to the electrothermal converter in accordance with a recording signal, and heating is performed by the electrothermal converter to exceed nucleate boiling. It is further preferable that the recording is performed by discharging the ink from the discharge port by the growth of the generated bubble.

Regarding the representative 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 both the so-called on-demand type and the continuous type. In particular, in the case of the on-demand type, the system is arranged corresponding to a sheet or a liquid path holding a liquid (ink). By applying at least one drive signal corresponding to the recorded information and providing a rapid temperature rise above nucleate boiling to
This is effective because heat energy is generated in the electrothermal transducer, thereby causing film boiling on the heat-acting surface of the recording head. As a result, bubbles in the liquid corresponding to this drive signal one-to-one can be formed. The liquid 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 immediately and appropriately performed, so that particularly excellent liquid ejection can be achieved, which is more preferable.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable.

Further, if the conditions described in US Pat. No. 4,313,124 of the invention relating to the temperature rise rate of the heat acting surface are adopted, more excellent recording can be performed.

As the configuration of the recording head, in addition to the combination of the discharge port, the liquid path, and the electrothermal converter (linear liquid flow path or right-angle liquid flow path) as disclosed in the above-mentioned respective specifications, The present invention also includes a configuration using U.S. Pat. Nos. 4,558,333 and 4,459,600 which disclose a configuration in which a heat acting portion is arranged in a bending region.

Japanese Unexamined Patent Application Publication No. 59-123670 discloses a configuration in which a common slit is used as a discharge portion of an electrothermal transducer for a plurality of electrothermal transducers, or an aperture for absorbing pressure waves of thermal energy. Unexamined Japanese Patent Application Publication No.
The effect of the present invention is effective even in a configuration based on JP-A-59-138461. That is, according to the present invention, the recording can be performed reliably and efficiently regardless of the form of the recording head.

Further, 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 medium on which a recording apparatus can record.

Such a recording head may have a configuration satisfying its length by a combination of a plurality of recording heads, or a configuration as a single recording head formed integrally.

In addition, even with the above-mentioned serial type, the recording head fixed to the carriage or mounted on the carriage enables electrical connection with the apparatus main body and supply of ink from the apparatus main body. A replaceable chip type recording head or a cartridge type recording head in which an ink tank is provided integrally with the recording head itself may be used.

Further, in addition to the above-described capping means, a cleaning means, a pressure or suction means, an electrothermal conversion type, or a structure different from the capping means, which is provided as a structure of the ink jet recording apparatus of the present invention. Preheating means by a heating element or a combination thereof,
Performing a preliminary ejection mode in which ejection is performed separately from printing is also effective for performing stable printing.

Regarding the type and number of print heads mounted on the carriage, for example, instead of providing a plurality of print heads as in the above-described embodiment, one print head may be used for a single color ink.
You may provide only a piece. That is, the recording mode of the recording apparatus may be configured only for the mainstream color such as black, not for color recording.

In addition, in the above-described embodiment, the ink is described as a liquid. However, an ink which solidifies at room temperature or lower and which softens or liquefies at room temperature, or an ink jet recording method The ink itself
Generally, the temperature is controlled within the range of 30 ° C. or more and 70 ° C. or less to control the temperature so that the viscosity of the ink is in the stable ejection range. Good. In addition, actively prevent the temperature rise due to thermal energy by using it as the energy of the state change from the solid state of the ink to the liquid state,
Alternatively, an ink that solidifies in a standing state for the purpose of preventing evaporation of the ink is used, and in any case, the ink is liquefied by application of a heat energy according to a recording signal, and a liquid ink is discharged, or a recording sheet is used. Can be applied to the case where an ink which is liquefied for the first time by thermal energy, such as one which starts to solidify at the time when the temperature reaches.

The ink in such a case is disclosed in JP-A-54-5
No. 6847 or Japanese Patent Application Laid-Open No. Sho 60-71260, in which the porous sheet is opposed to the electrothermal converter in a state of being held as a liquid or solid substance in the concave portion or through hole of the porous sheet. It is good. The most effective one for each of the above-mentioned inks is to execute the above-described film boiling method.

Further, as the form of the above-mentioned ink jet recording apparatus, 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 transmission / reception function can be used. It may take a form.

[0060]

As described above, according to the present invention, the member for giving a predetermined amount of movement to the recording sheet at the recording portion, the platen, and the holding means for the recording head can be attached to and detached from the main body of the recording apparatus. effective.

The positional accuracy of the members related to the recording sheet is improved, and in particular, the positional accuracy of each member related to the conveyance for providing a predetermined interval between the ink jet recording head and the recording sheet can be easily obtained. The conveying direction of the sheet becomes uniform in the width direction, and the conveying property is stabilized.

The accuracy of the moving amount of the conveyance and the accuracy of the position of the conveyed sheet with the ink jet recording head are improved, the slack or the tension of the recording sheet at the image recording portion is minimized, and the distortion of the recorded image and the image density unevenness are reduced. Alternatively, generation of streaks can be prevented.

Since the main parts of the image recording portion can be assembled beforehand outside the main body of the recording apparatus, the assembling workability is good.

If the recording sheet has a conveyance failure near the image recording portion, the members involved in the sheet conveyance can be detached, so that the recording sheet can be easily removed.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of an image recording apparatus according to a reference embodiment.

FIG. 2 is a schematic diagram showing a recording part.

FIG. 3 is an explanatory diagram of a configuration of an image recording apparatus according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Recording sheet 2 ... Main scanning motor 4 ... Main scanning belt 6 ... Main scanning rail 7 ... Carriage 8Y, 8M, 8C, 8Bk ... Cartridge 11 ... Upper guide 12 ... Lower guide 13 ... Sub scanning roller 14 ... Sub scanning driven roller 17 ... Conveyer motor 19 ... Platen 20 ... Discharge roller 21 ... Discharge driven roller 24 ... Discharge guide 25 ... Base 35,36 ... Slide rail

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tsukasa Uehara 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-1-290467 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B41J 2/01 B41J 29/00

Claims (3)

(57) [Claims] 1. An ink jet recording apparatus for performing ink jet recording on a recording sheet using an ink jet recording head disposed in a housing, comprising: a plurality of conveying rollers for conveying the recording sheet;
Head holding means for holding the inkjet recording head at a position spaced apart from and opposed to the bearing portion of each of the plurality of transport rollers, a platen and the recording sheet guided by the plurality of transport rollers at a predetermined interval; And a base for arranging the bases while maintaining their respective relative positional relationships, a recording position where the base is housed in the housing and ink jet recording on the recording sheet is possible, and a base outside the housing. An ink jet recording apparatus, comprising: a detachable position at which the base can be removed from the ink jet recording apparatus; and a base supporting means for movably supporting the base. 2. The ink jet recording apparatus according to claim 1, wherein a cap member for capping the ink jet recording head is held on the base. 3. An ink jet recording apparatus according to claim 1, wherein said base support means supports said base so as to be able to be pulled out in a recording sheet discharging direction by said transport roller.