JPH07323615A - Recording apparatus - Google Patents

Abstract

PURPOSE:To perform double-side recording collectively without performing recording by again turning put a recording medium subjected to single-side recording and to dry ink immediately after recording by arranging recording means on both sides of a recording medium feed passage and providing heaters in the vicinity of the recording means. CONSTITUTION:The recording sheets S on a placing stand 2 are fed in a sheet feed direction by a pickup roller 3 and separated one at a time by a separation roller pair 4 to be sent to a feed roller pair 5. When the leading end of each recording sheet S is detected by a sensor 8, the recording sheet S is sent into the gap between a surface recording means 9 and a platen 13 by a feed roller pair 6 and the surface thereof is recorded. Next, the recording sheet S is heated from the rear surface thereof by a heater means 11 to dry ink. Continuously, the recording sheet S is sent into the gap between a rear surface recording means 10 and a platen 14 by a feed roller pair 7 and the recording of the rear surface of the recording sheet S and drying are performed and the recording sheet is discharged to a sheet tray 16 by a discharge feed system 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device such as a copying machine or a printer, and more particularly to a recording device capable of recording on both sides of a recording medium.

[0002]

2. Description of the Related Art Conventionally, in a recording apparatus such as a copying machine or a printer, the recording means records on a recording medium conveyed by a conveying means composed of a pair of rollers or the like in accordance with information.
In such a recording apparatus, a recording head as a recording unit has a maximum width of a recording medium and a full-line type recording apparatus for recording all widths at once, or reciprocating in the width direction of the recording medium. There is a serial type recording device or the like that records while moving. In addition, as the recording method,
There are a thermal transfer recording system, a thermal recording system, a wire dot recording system, an inkjet recording system and the like. Above all, an inkjet recording type recording apparatus is drawing attention in terms of cost and compactness.

[0003]

However, the above-mentioned conventional recording apparatus does not have an apparatus for collectively recording on both sides of the recording medium due to problems such as ink bleeding and drying, and recording on both sides of the recording medium is not possible. In order to perform this, it was necessary to turn over the recording medium on which one-sided recording had been performed and send it again to the recording section.

Therefore, an object of the present invention is to provide a recording apparatus capable of performing double-sided recording collectively.

[0005]

A typical recording apparatus according to the present invention which achieves the above object has a conveying means for conveying a recording medium, a recording means for recording on the recording medium, and a heating for the recording medium. A heater means for storing the recording means on both the front surface side and the rear surface side of the recording medium via the conveyance path of the recording medium, and the heater means in the vicinity of the recording means. It is characterized by having done.

[0006]

In the above structure, since the recording means is arranged on both sides of the conveying path of the recording medium, the recording medium on which one-sided recording has been performed is not turned over again to perform recording on both sides at once. In addition, since the heater means for heating the recording medium is provided in the vicinity of the recording means, the ink on the recording medium can be dried immediately after recording, and the ink is bleeding, or It is possible to prevent ink stains on the rollers and the like.

[0007]

【Example】

[First Embodiment] An embodiment of a recording apparatus to which the present invention is applied will be specifically described below with reference to the drawings. FIG. 1 is a schematic sectional view showing a schematic configuration of a recording apparatus to which the present invention is applied.

In FIG. 1, reference numeral 1 is a main body of a recording apparatus, and in this embodiment, a recording means having a maximum width of a recording medium that can be used is provided, and the entire width of the recording medium can be collectively recorded. A so-called full line type recording apparatus is illustrated.

Reference numeral 2 is a mounting table on which a recording sheet S as a recording medium is mounted. A pickup roller 3 picks up and conveys the recording sheet S set on the mounting table 2. Reference numeral 4 denotes a separation roller pair, which is a forward rotation roller 4a for conveying the recording sheet S fed by the roller 3 in the sheet conveying direction, and a recording sheet S rotated in a direction opposite to the forward rotation roller 4a. The reverse rotation roller 4b prevents the double feeding of the sheets and separates them one by one.

Reference numerals 5, 6 and 7 are a pair of conveying rollers for conveying the recording sheet S in the sheet conveying direction. A sensor 8 as a leading edge detecting means for detecting the leading edge of the recording sheet is provided between the pair of conveying rollers 5 and 6.

Recording means 9 and 10 for recording on the recording sheet S are respectively arranged on the front surface side and the rear surface side of the recording sheet S via the conveyance path of the recording sheet S. Further, the recording means 9 and 10 are arranged on the upstream side and the downstream side in the sheet conveying direction. As the recording means in this apparatus, an ink jet recording system in which ink is ejected from a recording head to perform recording is used. That is, this recording head has a fine liquid discharge port (orifice), a liquid passage and an energy acting portion provided in a part of this liquid passage, and an energy generating means for generating a droplet forming energy that acts on the liquid in the acting portion. And so on.

As the energy generating means for generating such energy, a recording method using an electromechanical transducer such as a piezo element, electromagnetic waves such as a laser are irradiated to generate heat, and droplets are ejected by the action of the heat generation. There are a recording method using an energy generating means, a recording method using an energy generating means that heats a liquid by an electrothermal converter such as a heating element having a heating resistor, and ejects the liquid.

Among them, a recording head used in an ink jet recording method for ejecting a liquid by thermal energy has a high density of liquid ejection ports (orifices) for ejecting recording liquid droplets to form ejection liquid droplets. Since they can be arranged, high resolution recording is possible. Among them, the recording head using the electrothermal converter as the energy generating means can easily be made compact, and has the advantages of the IC technology and the microfabrication technology, which have been remarkably improved in technology and reliability in the recent semiconductor field. This is advantageous because it can be used in two parts, high-density mounting is easy, and the manufacturing cost is low.

Further, heater means 11 and 12 for heating the recording sheet S are provided near the recording means 9 and 10, respectively.
Is provided. Further, the heater means 11 and 12 are opposite to each other immediately after the recording portions (recording heads) 9a and 10a of the recording means 9 and 10 (that is, on the downstream side in the sheet conveying direction) and through the conveying path of the recording sheet S. It is arranged on the side.

Further, the recording section 9 of each of the recording means 9 and 10
Platens 13 and 14 that support and guide the back surface of the recording sheet S via the conveyance path of the recording sheet S are provided at the positions where a and 10a face each other.

Reference numeral 15 is a discharge / conveyance system for discharging the recorded recording sheet S to the sheet tray 16, 15a is a turn roller, 15b, 15c and 15d are rollers, and 15e is the roller.
A belt member that is laid over the turn rollers 15a and is in contact with 15b, 15c, and 15d, and a discharge roller 15f that is in contact with the roller 15c via the belt member 15e.

In the recording apparatus having the above structure, the recording sheet S set on the mounting table 2 is picked up and conveyed by the pickup roller 3 in the sheet conveying direction, and further separated by the separating roller pair 4 one by one and the conveying rollers. It is sent to pair 5. The leading edge of the recording sheet S sent to the conveying roller pair 5 is detected by the sensor 8 and then the conveying roller pair 6 and the platen recording means 9 and the platen.
The recording portion 9a of the front surface recording means 9 is fed between
At, the recording is made on the surface side. After that, the recording sheet S is heated by the heater means on the downstream side of the recording portion 9a.
The back side is heated by 11 and the ink on the front side is dried. Further, after the recording sheet S is fed between the back surface recording means 10 and the platen 14 by the pair of conveying rollers 7, the back surface side recording and drying operations are similarly performed.
The recording sheet S on which double-sided recording has been performed is discharged onto the sheet tray 16 by the discharging / conveying system 15. The timing of recording by the recording means 9 and 10 is the sensor 8
Is controlled by the time from when the leading edge of the recording sheet S is detected.

According to the present embodiment, the ink on the recording sheet S is dried by the heater means 11 and 12 immediately after recording by the recording means 9 and 10, so that the ink bleeding on the recording sheet S is minimized. Since the recording sheet S on which the recording is suppressed to the limit is dried and the ink is nipped and conveyed by each roller pair, it is possible to prevent the roller from being contaminated by the ink. Further, since the heater means 11 and 12 are provided on the downstream side of the recording portions 9a and 10a, the recording portions 9a and 10a are not dried.

Second Embodiment Next, a second embodiment of the double-sided recording apparatus according to the present invention will be specifically described with reference to the drawings. FIG. 2 is a schematic sectional view showing a schematic configuration of a double-sided recording apparatus according to the second embodiment of the present invention. It should be noted that members having substantially the same functions and configurations as those of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the present embodiment, the front surface recording means 9 for recording on the front surface side of the recording sheet S and the back surface recording means 10 for recording on the rear surface side are arranged at opposite positions via the conveyance path of the recording sheet S. At the same time, a heater roller pair 17 as a heater means for heating the recording sheet S is arranged upstream of the recording means 9 and 10 in the sheet conveying direction.

According to the above construction, the recording sheet S whose front end is detected by the sensor 8 is heated by the heater roller pair 17 and then recorded by the recording means 9 and 10, so that the ink on the recording sheet S is immediately printed. It is dried and does not stain the rollers on the downstream side. Further, since the front surface recording means 9 and the back surface recording means 10 are arranged at the opposite positions via the conveyance path of the recording sheet S, the apparatus can be further downsized as compared with the above-described embodiment. Further, since the recording sheet S is directly heated by the heater roller pair 17, the recording portions 9a and 10a of the recording means 9 and 10 are not dried.

[Other Embodiments] In the above-described embodiments, the ink jet recording method is used as the recording means. However, the electrothermal converter is energized according to a recording signal, and the thermal energy applied by the electrothermal converter is used. It is more preferable that the recording is performed by ejecting the ink from the ejection port due to the growth and contraction of the bubbles generated in the ink by utilizing the film boiling generated in the ink.

With regard to its typical structure and principle, it is preferable to use the basic principle disclosed in, for example, US Pat. Nos. 4,723,129 and 4740796. This method can be applied to both the so-called on-demand type and continuous type, but in the case of the on-demand type in particular, it is arranged corresponding to the sheet or liquid path holding the liquid (ink). By applying at least one drive signal to the electrothermal transducer, which corresponds to the recorded information and gives a rapid temperature rise beyond nucleate boiling,
This is effective because heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, and as a result bubbles in the liquid can be formed in a one-to-one correspondence with this drive signal. Due to the growth and contraction of the bubbles, the liquid is ejected through the ejection openings to form at least one droplet. It is more preferable to make this drive signal into a pulse shape, because the bubble growth and contraction are immediately and appropriately performed, so that particularly excellent liquid ejection can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise of the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. Nos. 4,558,333 and 4,459,600, which disclose configurations in which the heat acting portion is arranged in a bending region.

Further, Japanese Unexamined Patent Publication No. 59-123670 discloses a structure in which a common slit is used as a discharge portion of an electrothermal converter for a plurality of electrothermal converters, and an opening for absorbing a pressure wave of thermal energy. Japanese Patent Laid-Open Publication No.
The effect of the present invention is effective even if the configuration is based on Japanese Patent Laid-Open No. 59-138461. That is, according to the present invention, recording can be surely and efficiently performed regardless of the form of the recording head.

Furthermore, the present invention can be effectively applied to a serial type recording head which performs recording while reciprocating in the width direction of the recording medium. As such a recording head, a recording head fixed to a carriage, or a replaceable chip type that can be electrically connected to the apparatus main body and can supply ink from the apparatus main body by being attached to the carriage A recording head, or a cartridge type recording head in which an ink tank is integrally provided in the recording head itself may be used.

In addition, the above-described full-line type may be used, either by a combination of a plurality of recording heads to satisfy the length thereof, or by one recording head integrally formed.

Further, it is preferable to add a recovery means for the recording head, a preliminary auxiliary means, etc., which are provided as a component of the recording apparatus of the present invention, because the effects of the present invention can be further stabilized. Specific examples thereof are capping means, cleaning means, pressurizing or suctioning means for the recording head, electrothermal converter or a heating element other than this, or preheating means by a combination thereof, and recording. It is also effective to perform a stable recording by performing a preliminary discharge mode in which another discharge is performed.

In the serial type recording device,
Regarding the type and number of recording heads mounted on the carriage, for example, only one is provided corresponding to a single color ink, or a plurality of recording heads are provided corresponding to a plurality of inks having different recording colors and densities. Can be That is, for example, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but the recording head may be integrally configured or a plurality of combinations may be used. Alternatively, it can be applied to an apparatus provided with at least one of full colors by color mixing.

In addition, although the ink is described as a liquid in the above-mentioned embodiments, it is an ink that solidifies at room temperature or lower and softens or liquefies at room temperature, or in the ink jet recording system. 30 inks
Generally, the temperature is controlled in the range of ℃ or more and 70 ℃ or less to control the temperature of the ink so that the viscosity of the ink is in the stable ejection range. good. In addition, it is possible to prevent the temperature rise due to thermal energy from being positively used as the energy for changing the state of the ink from the solid state to the liquid state, or to use ink that solidifies when left standing for the purpose of preventing ink evaporation. In any case, heat such as ink that is liquefied by the application of heat energy according to the recording signal and liquid ink is ejected or that has already started to solidify when it reaches the recording sheet. It is also applicable when using an ink that has the property of being liquefied for the first time by energy.

The ink in such a case is disclosed in JP-A-54-568.
As disclosed in Japanese Patent Publication No. 47 or Japanese Patent Laid-Open Publication No. 60-71260, a form in which the electrothermal converter is opposed to the concave portion or the through hole held in the liquid sheet as a liquid or solid substance. Also good. The most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

Further, as the form of the above-mentioned ink jet recording apparatus, in addition to a form used as an image output terminal of an information processing equipment such as a computer, a form of a copying apparatus combined with a reader or the like, and a form of a facsimile apparatus having a transmitting / receiving function are also available. It may be something to take.

Although the example using the ink jet recording system as the recording means has been described above, the recording system of the present invention does not need to be limited to the ink jet recording system, and other thermal transfer recording systems, thermal recording systems, and Can be applied to a recording method such as a wire dot recording method or another recording method. Further, it is not necessary to limit to the full line recording method, and a so-called serial recording method may be used.

[0035]

As described above, by disposing the recording means on both sides of the conveying path of the recording medium, the recording medium on which one-sided recording has been performed is not turned over again and recording is performed on both sides at once. Further, by providing a heater means for heating the recording medium in the vicinity of the recording means, the ink on the recording medium can be dried immediately after recording. Therefore, it is possible to prevent the ink from bleeding, the ink stain on the roller, and the like.

Further, by adopting the ink jet system as the recording means, low noise and high speed recording are possible, and high quality recording is possible. In this case, by providing an electrothermal converter for generating thermal energy as ink ejection energy, the head can be easily made compact and the manufacturing cost can be reduced.
Further, by ejecting the ink from the ejection port by utilizing the film boiling generated in the ink by the thermal energy at the time of ejecting the ink, it is possible to obtain an effect that a high-definition image can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a schematic configuration of a recording apparatus according to a first embodiment of the invention.

FIG. 2 is a schematic sectional view showing a schematic configuration of a recording apparatus according to a second embodiment of the invention.

[Explanation of symbols]

 S ... Recording sheet 1 ... Recording device main body 2 ... Mounting table 3 ... Pickup roller 4 ... Separation roller pair 4a ... Forward rotation roller 4b ... Reverse rotation roller 5, 6, 7 ... Conveying roller pair 8 ... Sensor 9, 10 ... Recording means 9a , 10a ... Recording unit (recording head) 11, 12 ... Heater means 13, 14 ... Platen 15 ... Ejecting / conveying system 15a ... Turn rollers 15b, 15c, 15d ... Roller 15e ... Belt member 15f ... Ejecting roller 16 ... Sheet tray 17 ... Heater roller pair

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B41J 29/00 B41J 29/00 H

Claims (8)

[Claims] 1. A recording medium, comprising: a conveying unit configured to convey the recording medium; a recording unit configured to perform recording on the recording medium; and a heater unit configured to heat the recording medium, the recording medium being conveyed through a conveying path of the recording medium. A recording apparatus, wherein recording means is provided on both the front surface side and the back surface side, and the heater means is provided in the vicinity of the recording means. 2. The recording apparatus, wherein each recording means is arranged on the upstream side and the downstream side in the recording medium conveying direction,
2. The recording apparatus according to claim 1, wherein the heater unit is arranged immediately after the recording position of each recording unit and on the opposite side of the recording medium conveyance path. 3. The recording apparatus according to claim 1, wherein each recording means is arranged at an opposing position via a conveyance path of a recording medium, and the heater means is arranged immediately before the recording means. The recording device according to 1. 4. The recording device according to claim 1, wherein the recording device is a full-line recording system in which the recording means has the maximum width of the recording medium and performs recording at the same width. . 5. The recording apparatus according to claim 1, wherein the double-sided recording apparatus is a serial recording method in which recording is performed while the recording unit reciprocates in the width direction of the recording medium. 6. The recording apparatus according to claim 1, wherein the recording apparatus is an inkjet recording method in which a recording unit ejects ink in accordance with a signal to perform recording. 7. The recording device according to claim 6, wherein the recording device includes an electrothermal converter for generating thermal energy for ejecting ink by the recording means. 8. The recording apparatus according to claim 7, wherein the recording means ejects the ink from the ejection port by utilizing the film boiling generated in the ink by the thermal energy applied by the electrothermal converter. The recording device according to 1.