JP2001246740A - Inkjet printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform ink drying without providing a separate drying device, in order to prevent adverse effects due to undried ink on a recorded sheet. SOLUTION: A sheet P guided on a platen 10 is supplied with ink selectively ejected from an ink head 11.
In the ink jet printer 1 which reproduces an image by ink dots by colliding with the printer, a circuit board 15 for controlling the printer and the like is arranged in a space (interval) above the sheet feeding cassette 3 below the platen 10. . The circuit board 15 is wired with heat generating members such as an IC (electronic component) for controlling the printer and a power supply (a converter and an electric component for power supply), so that the heat from the circuit board 14 can be obtained without providing a separate drying device. Then, the platen 10 is heated and the ink of the sheet P can be dried efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet printer having a function of drying undried ink after recording.

[0002]

2. Description of the Related Art A recording apparatus (printer) forms a visible image on a sheet as a recording medium so that image data obtained by reading an image of a document, image data input from another apparatus, and the like can be viewed. This is output as a hard copy. This recording device is, for example, an electrophotographic system,
In general, an ink jet system in which ink is selectively discharged to perform recording, a thermal recording system having a thermal head having thermal paper or thermal transfer ink, or the like is used.

In this case, in particular, an image forming apparatus using an ink jet system, that is, an ink jet printer selectively discharges ink in accordance with input image data, and applies a color ink to a sheet as a recording medium to be conveyed. Thus, a visible image is formed by dots. The recorded / reproduced image, that is, the image of the ink dot is in an undried or unfixed state, is discharged to a discharge tray or the like as it is, and is superimposed (stacked) on the next sheet, and then the discharged sheet is discharged. Is shown on the back side of the sheet to be discharged next.

For this reason, a drying device for blowing hot air or the like after recording is separately provided to dry an ink image on a sheet discharged to a discharge tray. However, in an ink jet printer that is required to be reduced in size and cost, a space for separately providing a drying device cannot be secured, and there is no room for providing a cost.

Therefore, in the discharge device, the discharged sheet is separated from the next discharged sheet until the sheet is discharged, and the ink is dried using the time until the discharge. A way to do this has been proposed. For example, in U.S. Pat. No. 4,794,859, a discharged sheet of a recording corner is held on a discharge tray for receiving a previously discharged sheet so as to be separated from the previous sheet. Thereby, the drying time of the ink recorded on the previous sheet is secured. Then, the sheet held above the sheet separated from the previous discharged sheet is configured to drop the held sheet into the discharge tray at the timing of discharging the next sheet.

With such a configuration, it is possible to secure the ink drying time in at least the continuous sheet discharging time of two sheets, and it is possible to suppress the above-described disadvantage of show-through due to ink transfer.

[0007]

As described above, the sheet, which is a recorded recording medium, is held on the discharge tray so as to be separated from the previous discharged sheet, and until the next recorded sheet is discharged. It can be dried using the time of
There is no need to provide a drying device in the printer body. This makes it possible to reduce the size of the device.

However, according to the above-described discharge device, a member for supporting the next discharge sheet on the discharge tray for receiving the discharge sheet, the member is made movable, and the supported sheet is placed on the discharge sheet on the discharge tray. The driving mechanism and the like for dropping it into the device become very large. For example, a sheet held at the upper part needs to be held in a state parallel to the lower discharge tray, and it is necessary to determine and hold a position where the sheet does not hang down due to bending down. In order to drop the holding member from the holding state, the entire holding member needs to be movable, and the mechanism is very large and the cost is high.

In the case where the ink is dried by the above-described conventional discharge device, it is not a sufficient measure for an ink jet printer capable of high-speed processing. It is expected that sheets are successively deposited without sufficient drying time, and undried ink is transferred to the back of the sheet to show off.

Moreover, since the ink is naturally dried, it is not possible to prevent the ink on the sheet from bleeding. That is, when hot air or the like is blown onto the sheet to dry it, there is no such problem, but in the case of natural drying, the ink permeates and bleeds. In particular, the sheet is water-absorbing, and in a high humidity state, the bleeding of the ink becomes more conspicuous and the drying time becomes longer. Therefore, if relying on natural drying, sufficient drying cannot be expected, and show-through cannot be eliminated because the next sheet is deposited without drying.

The above problem can be solved by separately providing a drying device. However, the necessity of securing a space for installing the drying device increases the size of the entire device and increases the cost.

The present invention has been made in view of the above-mentioned problems,
An ink jet printer which aims to solve the problem and efficiently dries an ink image on a recording medium without particularly providing a drying device while avoiding an increase in the size of the device. The purpose is to do.

Another object of the present invention is to provide an ink jet printer which efficiently uses the members provided in the printer to efficiently dry the ink without separately providing a special drying means for the recording medium to be discharged. It is.

It is a further object of the present invention to provide an ink jet printer in which the drying of the ink is performed at the same time as the water absorption of the recording medium can be taken into consideration, and the bleeding of the ink is minimized.

[0015]

According to the present invention, there is provided an ink jet printer which is provided in correspondence with an ink head for discharging ink and has a lower portion of a guide member which supports and guides the back surface of a recording medium. In which an electric circuit board of an ink jet printer is arranged.

The electric circuit board of the ink jet printer has a control circuit necessary for controlling the operation of the ink jet printer, and a power supply circuit for supplying power to the circuit. Therefore, a large amount of heat is generated by energization. By utilizing the heat, the guide member for guiding the recording medium to the recording position facing the ink head can be heated. Therefore, the ink image recorded on the recording medium guided on the guide member is heated and dried.

Therefore, without providing a separate drying device,
By arranging the electric circuit board originally provided in the ink jet printer on the opposite side to the guide member and the ink head, the ink generated can be effectively used to dry the ink, thereby increasing the size of the apparatus. Accordingly, drying of the ink can be promoted, and image quality deterioration due to bleeding or the like can be prevented. Moreover, there is no factor that increases the cost.

Further, in the ink jet printer having the above-described configuration, if the ink jet printer is configured to provide a sheet feeding section for feeding a recording medium below the guide member, the ink supply can be supplied to the guide member. By arranging the electric circuit board between the paper unit and the paper unit, it is possible to heat not only the guide member but also the recording medium located in the paper feeding unit. Therefore, the water absorbed by the recording medium in a high humidity state is removed to some extent, and an ink image is formed in this state, so that ink drying is promoted and bleeding or the like can be prevented. In addition, the space between the sheet feeding unit and the guide member corresponding to the recording position can be utilized, and by providing the electric circuit board in the space, the overall size of the apparatus can be reduced, leading to cost reduction.

Further, in the ink jet printer having the above-described configuration, a radiation fin for heat radiation is provided on the electric circuit board, and the radiation fin is arranged near the guide member. As a result, the heating effect of the guide member is further enhanced at the same time as the protection of the electric components and the electronic components provided by the temperature rise. Thereby, the effect of drying the image by the ink dots is also enhanced.

Further, in the ink jet printer having the above-described configuration, the heat radiation fins are arranged apart from a recording position facing the ink head, and are arranged corresponding to a guide member for guiding a sheet after recording. By forming a plurality of openings in the guide member corresponding to
The heat from the radiation fins is directly transmitted to the recorded recording medium,
Drying of the ink on the recording medium can be further promoted. In addition, since the opening is located on the discharge side from the recording position of the ink head, the trajectory of the ejected ink can be prevented from being deflected, so that stable recording and efficient ink drying can be performed.

Further, in the ink jet printer having the above-described structure, heat radiation fins for heat radiation are provided on the electric circuit board, and the heat radiation fins can also be used as a guide member for guiding a sheet facing the ink head. . With such a configuration, the heat of the radiation fins can be directly transmitted to the recording medium, and the effect of ink drying can be further enhanced. In this case, it has not only the function of the original radiation fin but also a function as a guide for guiding the recording medium to a position facing the ink head. For this reason,
It is possible to reduce the number of parts, reduce costs, and at the same time, further enhance the heat radiation effect of the electric circuit board by the guide.

On the other hand, in the ink jet printer having the above-described structure, in order to cope with a high humidity condition, a heat radiation fin for heat radiation is provided on the electric circuit board, and the heat radiation fin is opposed to the sheet feeding unit. And place it as shown. With such a configuration, the recording medium in the sheet feeding unit can be efficiently heated in advance. Thereby, the absorbed water can be removed to some extent, and after the formation of the ink dots on the recording medium, the ink drying can be promoted. Therefore,
Even in a high humidity state, the effect of preventing ink bleeding and the like and promoting ink drying is increased.

Further, in the ink jet printer having the above-described structure, a high-humidity condition is coped with, and at the same time, the heat-radiating fins for heat radiation are opposed to the ink head side and the recording medium is mounted on the ink head. When used also as a guide member for guiding, in addition to the above-described functions and effects, it is possible to further promote ink drying by using heat radiation fins. Further, since the heat radiation fins are provided on the paper feeding unit side and the guide member side, the heat radiation effect of the circuit board is further enhanced, and the protection effect of the circuit components is also enhanced.

[0024]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a view showing an example of a configuration for enabling ink drying on a sheet as a recorded recording medium of an ink jet printer for explaining a first embodiment of the present invention. FIG. 2 is a perspective view showing the appearance of the ink jet printer which enables drying of the ink shown in FIG.

First, in FIG. 2, reference numeral 1 denotes an ink jet printer main body, and reference numeral 2 denotes an upper cover including an operation panel disposed on the upper portion of the ink jet printer. The upper cover 2 including the operation panel is provided so as to be rotatable around a fulcrum shaft (not shown), and particularly, a recording unit of the ink jet printer can be opened. This facilitates operations such as cartridge replacement.

A detachable paper feed cassette 3 is provided below the printer 1. The paper feed cassette 3 stores therein a sheet, which is a recording medium of a predetermined size, and is mounted on a mounting portion of the main body of the printer 1 so that one of the stored sheets is fed from the top. It has become so.

The sheet fed from the paper feed cassette 3 is sent to a printing position via a sheet transport system, and is printed by an ink head which discharges ink located at the printing position. A record is made.
After the recording, the sheet is discharged to a discharge tray 4 disposed above the sheet cassette 3. The discharge tray 4 is provided detachably from the main body of the printer 1 and is mounted so as to protrude from the main body of the printer 1.

Next, a schematic configuration of the main body of the ink jet printer 1 will be described with reference to FIG. In FIG. 1, a sheet P, which is a recording medium, is accommodated in a paper feed tray 3 which is detachable from the main body of the inkjet printer 1 as described above.

At the top of the paper feed tray 3 mounted,
A pickup roller 5 for feeding paper from the accommodated uppermost sheet P is disposed opposite to the upper end of the sheet. This pickup roller 5 rotates once,
The top sheet P is sent out. Sheet P sent out
Is fed to a paper feed roller 6 provided corresponding to the pickup roller 5.

The paper feed roller 6 has a reverse path (U-shaped path).
The pickup roller 5
The sheet is nipped with the lower first pressure roller 7 arranged corresponding to the sheet conveying direction of the sheet sent out in the step S1 to convey the sheet in reverse. Above the paper feed roller 6, a second pressure roller 8 is provided to further convey the sheet to be reversely conveyed to a target position, especially a recording position.

The sheet fed by the second pressure roller 8 and the paper feed roller 6 constitutes a registration means disposed before the recording position. That is, the registration unit temporarily stops the sheet P, and controls the conveyance and the start of the sheet P in synchronization with the recording start operation at the recording position. In addition, according to the inkjet printer 1, by terminating the recording operation for one line or a plurality of lines, sheet feeding of an amount corresponding to the line is started. When printing by ink ejection is being performed, conveyance of the sheet S is stopped.

A transport guide 9 for guiding the fed sheet to the recording position is provided between the recording position and the second pressing roller 8 serving as a registration unit. At the recording position guided by the transport guide 9, a platen 10 constituting a guide member having a flat portion that receives the back surface of the sheet P after being turned is along an extension of the guide surface of the transport guide 9. Are arranged as follows.

At this recording position, ink droplets (dot ink) are opposed to the platen 10 via the sheet P.
An ink head 11 for appropriately discharging the ink is provided. The ink head 11 is mounted on an ink carriage 12. The ink carriage 12 is slidably provided on a slide shaft 13, for example, provided in a plane perpendicular to the sheet conveying direction. Thereby, the ink head 11 scans the sheet P conveyed by the start of recording by one scan in a direction orthogonal to the conveyance direction.
Perform dot recording for the required number of lines. At this time, when the ink head 11 scans, the sheet S is stopped as described above, and ink ejection control is performed in accordance with the image data. Is performed in accordance with the sheet feed control. During this sheet feeding, the ink head 11 is driven to return to the home position where the original scanning starts. By repeating this sequentially, it is possible to reproduce and record an image for one page using ink dots corresponding to the image data.

The sheet P on which recording has been completed is discharged to a discharge tray 4 constituting a sheet discharge device via a discharge roller 14 provided immediately after the recording position. The discharge roller 14 is a driving roller on which one of the rollers 14a is driven and rotated. A driven roller 14b that is driven and rotated with respect to the driving roller 14a is pressed against the driving roller with an appropriate pressure. Further, since the driven roller 14b is located on the side in contact with the recording ink, it is formed in a spur (star) shape in order to eliminate the offset.

(First Embodiment of the Present Invention) In the ink jet printer 1 for performing recording with liquid ink according to the present invention, the sheet discharge device for finally receiving the reproduced and recorded sheet P is the discharge tray described above. 4 and a discharge roller 14. In such a sheet discharge device, the recorded sheet P is discharged to the discharge tray 4 as it is, so that the ink is not sufficiently dried.
When a subsequent discharge sheet is discharged onto a previous discharge sheet, show-through may occur.

Therefore, according to the first embodiment of the present invention, as shown in FIG. 1, the recording ink is efficiently heated and heated by a platen 10 which is a guide member arranged opposite to the ink head 11. Promotes drying. Therefore, in the present invention, members provided in advance in the ink jet printer are used as they are without separately providing a heating means or the like. Therefore, a part of an electric circuit board (hereinafter, referred to as a circuit board) 15 of the printer 1 main body is arranged below the platen 10.

The circuit board 15 is wired with a power supply circuit, a control circuit for driving and controlling the printer body, and emits a considerable amount of heat. As described above, the circuit board 15 corresponds to an electronic circuit board that controls a power supply in the ink jet printer main body and various input / output (IO) devices, and has various ICs mounted thereon. Above all, a CPU as a control means for performing printing scan of the ink head 11, ink discharge control, sheet conveyance control, etc., a motor and other FETs for driving non-driving members, etc. are electrically connected to the substrate by wiring. Have been.

In particular, depending on the method of using the CPU, transistors such as FETs, and the like, electric and electronic components that are heated to a high temperature are provided with radiating fins (heat sinks) constituting cooling members for the purpose of lowering the temperature. This gives I
The temperature of C etc. is transmitted through the radiating fins and cooled by air, preventing the temperature of IC etc. from rising, maintaining a constant temperature, and enabling accurate operation of electronic components without specially providing a fan or the like. . In addition, a power supply circuit and the like for supplying electric and electronic components described above are provided.

Therefore, as described above, the electric and electronic components having heat are provided with heat radiating fins and the like, and the heat of the heat radiating fins is used to utilize the heat of the heat radiating fins.
0 can be heated by the heat and heated.

Then, the sheet P recorded via the ink head 12 is heated by the heat generated from the circuit board 15 while being guided and conveyed by the platen 10,
Drying of the ink on the sheet is promoted. Thereby, the recorded ink can be prevented from bleeding, and even if it is discharged onto the discharge tray 4, since drying is promoted, it is possible to prevent the occurrence of show-through and the like.

Further, according to the configuration of the present invention, no special means for drying the ink is provided, and the circuit board 15 provided in advance in the main body of the ink jet printer 1 is not provided.
Is disposed below the platen 10 at the recording position where the sheet is discharged, whereby the ink can be efficiently dried, and the heat generated can be effectively used to promote the ink drying. If the platen 10 is formed of a metal or the like having good thermal conductivity, drying can be more effectively promoted.

In FIG. 1, the paper feed cassette 3 is provided below the circuit board 15. That is, the circuit board 15 is disposed in a space between the sheet cassette 3 and the platen 10 at the recording position. By arranging the circuit board 15 in such a wasted space that originally existed as a space, the wasted space can be eliminated and the printer 1 can be further reduced in size. Moreover, the lower paper cassette 3
The sheet P accommodated therein can be heated by the heat generated in the circuit board 10. Thereby, the effect of drying the storage sheet is enhanced, and the effect of preventing the ink from bleeding is further enhanced.

(Second Embodiment of the Present Invention)
In the inkjet printer 1 of the present invention according to the embodiment, the circuit board 15 is at least a recording position,
It was arranged below the platen 10 corresponding to the sheet after recording. In this case, the heat generated in the circuit board 15 is effectively radiated as described above, and
Radiation fins are provided to prevent a temperature rise on the fifth side, particularly a temperature rise of electronic and electric components. An example of a suitable position where the heat radiation fins are provided will be described below as a second embodiment.

FIG. 3 is a detailed view of the vicinity of the recording position surrounded by the dashed line shown in FIG.
In order to prevent the temperature of electronic components and electric components from rising.

The radiating fins 16 are located near the lower part of the platen 10. Then, the arrangement position is not at the lower portion facing the ink head 11, but after recording is completed,
This is a lower portion of the platen 10 in a path for discharging the sheet. Therefore, after the ink ejected from the ink head 11 reaches the sheet surface and is recorded on the sheet P, the ink is dried on the platen 10 which is sufficiently heated while being guided and discharged on the platen 10. Is promoted.

In FIG. 3, a plurality of openings 17 are formed in the platen 10 corresponding to the radiation fins 16. By providing this opening 17, the radiation fin 16
With the heat of the sheet P, the outside air whose temperature has increased is also added to increase the heating effect from the back surface of the sheet P which is being discharged and is being discharged. Therefore, the drying action of the ink image on the surface of the sheet P is further enhanced.

In addition, the effect of heating the back surface of the sheet P being discharged is enhanced, and the sheet P recorded by the ink head 11 is not adversely affected. In other words, it is possible to prevent the direction of the ejected ink from changing due to the rising airflow at the position facing the ink head 11, to perform a stable recording operation, and to further enhance the drying effect.

(Third Embodiment of the Present Invention) According to the first and second embodiments described above, the circuit board 15 on which the electronic parts and the electric parts of the ink jet printer 1 are wired is simply a platen. It is arranged at the lower part of 10.

Therefore, the platen 10 is indirectly heated by the heat generated from the circuit board 15 or the heat from the radiation fins 17, and the heat is used to dry the ink. A method and means for using this heat more efficiently will be described below with reference to FIG. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the configuration and operation are the same, so that the description thereof will be omitted. This is the same in the description of the second embodiment.

In FIG. 4, a platen that is arranged to face the ink head 11 and supports the sheet P at a constant interval from the ink head 11 is also used as the radiation fin 18 of the circuit board 15.

The radiating fins 18 have the same width as the platen and the length in the direction in which the sheet P is conveyed, and the guide surface of the sheet P, that is, the supporting surface, as shown in FIG. The portion facing 11 is formed on a flat surface. Moreover, the flat surface is provided along the guide surface of the transport guide 9 for feeding the sheet P to the recording position.

According to such a configuration, the radiating fins 18 constituting the platen can achieve the function as the cooling means for preventing the rise of the temperature of the electronic components and the electrical components on the circuit board 15 at the same time, and at the same time, achieve the function as the cooling means. The sheet P in the present invention has a function as a drying device for heating the sheet P and drying the recorded ink at the same time.

Therefore, it is not necessary to provide a platen as in the related art, and the number of components can be reduced by using the radiating fins 18 existing on the electric circuit board 15 or the like in advance as the platen. In addition, the ink on the sheet P can be dried more efficiently by the indirect temperature rise of the platen due to the outside air, that is, not by heating, but by the direct temperature rise, and problems such as bleeding can be solved. Further, the heat of the heat radiating fins 18 is taken away for drying the sheet P and the ink, and the heat radiating effect of the electronic and electric components is promoted.

(Fourth Embodiment of the Present Invention) As described above, in the various embodiments of the present invention, the ink on the sheet after recording can be dried efficiently, and the ink can be reduced in size by preventing ink bleeding. An inkjet printer can be provided. In the embodiments described above, the purpose of the present invention is particularly to dry ink on a sheet. At the same time, the purpose of the present invention is to remove the moisture of the fed sheet and improve the bleeding prevention effect. This will be described below. In particular, an embodiment that can exert an effect as a countermeasure in a high humidity state will be described below.

FIG. 5 shows an example. Also,
1 are denoted by the same reference numerals. In the embodiment shown in FIG. 5, radiating fins for radiating heat generated from the circuit board 15 shown in FIG. 1 are used as preheating of the sheet. That is, the radiating fins 20 for preventing the temperature of the circuit board 15 from rising are provided not in the platen 10 side but in the space between the platen 10 and the sheet feeding cassette 3 as the sheet feeding section. The sheet P is provided so as to face the sheet P stored in the sheet feeding cassette 3 located at the lower part of the sheet feeding cassette.

Therefore, the sheet P in the sheet cassette 3 is
The sheet P is heated by the heat from the radiating fins 20, and the moisture of the sheet P is removed to some extent. The sheet P is fed, recording is completed, and the sheet P is guided to the discharge roller 4 on the platen 10. At this time, as described in the first embodiment, the platen 10 is heated by the heat of the circuit board 15, and drying of the ink after recording is promoted. Moreover, since the sheet P is pre-warmed, the sheet P is more efficiently dried before the ink permeates and bleeds.

That is, the sheet P accommodated in the paper feed cassette 3 is warmed first, and is warmed from the back even while being guided on the platen 10, so that drying of the ink is promoted and ink bleeding is efficiently performed. Can be prevented.

As shown in FIG. 6, in order to utilize the features of the third embodiment described in FIG. In this configuration, the radiation fins of the circuit board 15 are arranged not only on the sheet cassette 3 side but also on the recording position side. According to such a configuration, the sheet P is warmed before recording, and directly after the recording, the platen (the radiation fins 1) is directly heated.
By the heat radiation of 8), drying of the ink is accelerated, and the effect of preventing bleeding and the like is further enhanced.

As described above, the ink jet printer 1 of the present invention effectively utilizes the heat generated by the electronic and electric components wired on the control circuit board and the like, which is originally provided, and uses this heat after recording. Used as ink drying. Therefore, by arranging the circuit board 15 by effectively utilizing the space between the conventional sheet feeding unit and the recording position without increasing the size of the apparatus as a whole, the space is effectively utilized, and further miniaturization is achieved. It becomes possible.

Then, the ink jet printer 1 can be provided which makes use of the functions provided in the prior art as it is, without providing a separate drying device, effectively drying the ink, preventing the adverse effects of bleeding, and preventing show-through.

[0061]

The ink jet printer according to the present invention described above does not use a drying device provided for drying the ink on the recording medium, but uses the conventional electric circuit board for drying. Therefore, the size of the apparatus body can be increased, and the ink can be efficiently dried.

Further, by disposing the heat-generating circuit board in the space between the paper feeding unit and the paper discharging unit, the size of the apparatus can be further reduced.
It is also possible to preheat the recording medium.

Further, by using the heat radiation fins of the electric circuit board also as a guide member for facing the recording medium at the recording position, not only can the ink be dried more efficiently, but also the number of parts can be reduced. Becomes

By providing a radiation fin or the like so as to be opposed to the paper feeding unit side, the recording medium can be pre-warmed, can cope with a high humidity state, and can bleed due to the water absorbing recording medium. The prevention effect is further enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a main part of an ink jet printer showing a recording position and a discharge portion for achieving an ink drying function according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an external appearance of an ink jet printer having therein a portion achieving a drying function shown in FIG.

FIG. 3 is a configuration diagram showing recording positions for explaining the configuration of a second embodiment of the present invention.

FIG. 4 is a configuration diagram according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram showing another example of the fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ink-jet printer 3 Paper supply cassette (paper supply part) 4 Discharge tray 5 Pickup roller 6 Paper supply roller 10 Platen (guide member) 11 Ink head 14 Discharge roller 15 Circuit board 16 Heat radiation fin 17 Opening 18 Heat radiation fin (also serves as platen) 20 Heat radiation fins (for sheet heating) P sheet (recording medium)

Continued on the front page (72) Inventor Takashi Goto 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside (72) Inventor Hiroyuki Murai 22-22 Nagaikecho, Abeno-ku, Osaka-shi, Osaka (72) Inventor Masashi Hatanaka 22-22 Nagaikecho, Abeno-ku, Osaka City, Osaka F-term (in reference) 2C056 EA05 EA23 HA28 HA44 HA51 2C058 AB16 AC07 AE02 AE09 AF04 AF31 DA05 DA11 DA34 DA35 2C061 AQ05 BB35

Claims (7)

[Claims] 1. An ink jet printer, wherein an electric circuit board of the ink jet printer is provided below a guide member provided corresponding to an ink head for discharging ink and supporting and guiding the back surface of a recording medium. 2. The ink jet printer according to claim 1, further comprising a sheet feeding unit for feeding a recording medium below the guide member.
2. The ink jet printer according to claim 1, wherein an electric circuit board is disposed between the guide member and the sheet feeding unit. 3. The ink jet printer according to claim 1, wherein heat radiation fins for heat radiation are provided on the electric circuit board, and the heat radiation fins are arranged near the guide member. 4. The radiating fin is spaced apart from a recording position facing the ink head, is arranged corresponding to a guide member for guiding a sheet after recording, and a plurality of openings are formed in the guide member corresponding to the arrangement. The ink jet printer according to claim 3, wherein: 5. The electric circuit board according to claim 1, wherein heat radiation fins for heat radiation are provided, and the heat radiation fins are provided also as a guide member for guiding a sheet facing the ink head. The ink-jet printer as described. 6. The ink jet printer according to claim 2, wherein heat radiation fins for heat radiation are provided on the electric circuit board, and the heat radiation fins are arranged so as to face the sheet feeding unit. 7. The ink jet printer according to claim 6, wherein the heat radiation fins for heat radiation also face the ink head and also serve as a guide member for guiding the recording medium to the ink head. .