JPH0445053A - recording device - Google Patents

Abstract

PURPOSE:To straighten the curl of a sheet as well as to discharge it onto a tray with certainty by straightening the sheet's curl with a discharge rotor while discharging it, and making the discharge angle smaller than a setting angle of the discharge tray. CONSTITUTION:A discharge roller pair 5 consists of an upper roller 5a and a lower roller 5b, and they are set up pectinately in an alternate manner, while an outer diameter of the upper roller 5a is made larger than that of a press roller part 5a2 pressing the lower roller 5b. Accordingly, a recording sheet 2 being discharged by the discharge roller pair 5 is transformed into a wavy pattern, that is, it is made hard to be bent and, what is more, such a possibility that it might be curled upside down is thus prevented from occurring. In addition, the roller pair 5 is set up so as to have the recording sheet 2 being discharged by this roller pair 5 discharged at a yet smaller angle beta of a setting angle of a discharge tray 6 to a body unit A. Therefore the discharged sheet 2 is discharged onto the tray 6 without hitching on the midway of the tray 6.

Description

[Detailed Description of the Invention] <Field of Application of Industry-J> The present invention relates to a recording device used in a facsimile machine, a copying machine, a printer, etc. The present invention relates to a recording device that can be used.

<Prior Art> Today, office automation equipment such as facsimile machines and copying machines are widely used, and various types of recording devices constituting their information output units have been developed. Among these, the ink-side recording method, which records by discharging liquid ink onto a recording sheet according to image signals, has excellent low noise characteristics, can perform high-speed recording, and also performs a specific fixing process on so-called plain paper. It has been attracting attention in recent years because it allows recording without any problems.

The common inkjet recording method is the so-called serial scan method, in which ink is ejected while moving the recording head in the recording sheet's radial direction, but the so-called multi-nozzle method, in which the recording head is the same width as the recording sheet, Since recording can be performed line by line, it has the advantage of greatly increasing the recording speed.

<Problems to be Solved by the Invention> However, in the multi-nozzle inkjet recording, ink is ejected line by line at a time, so a large amount of ink adheres to the recording sheet in a short period of time.

For this reason, as shown in FIG. 9, the ink adhesion surface of the recording sheet 50 expands rapidly, and the sheet discharged to the discharge tray 51 is likely to curl downward. When this curl occurs, the recording sheet 50 discharged The sheets 52 are ejected while coming into contact with the sheets 52 that have already been ejected onto the ejection tray 5. - Discharge tray 51 and sheet 52 for boat fishing
Since the frictional force between the sheets 50 and 52 is greater than the frictional force between the sheets 50 and 52, when the sheet 50 curled downward as described above is ejected, the sheet 52 is pushed out and is not properly stacked on the ejection tray 51. There are issues such as the fact that it is no longer being used.

The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide a recording apparatus that prevents the sheet after recording from curling due to adhesion of ink and allows the recording sheet to be ejected accurately.

<Means for Solving the Problems> A typical means according to the present invention for solving the above problems includes a sheet conveying means for conveying a recording sheet, and a sheet conveying means for recording on the conveyed recording sheet. recording means;
It has a discharge rotary body for discharging the recording sheet after recording, and a discharge tray attached at a predetermined angle to the main body of the apparatus to accommodate the discharged recording sheet, and the discharge rotary body discharges the recording sheet. What is claimed is: 1. A recording apparatus, characterized in that the recording sheet is configured to correct the curl of the recording sheet, and configured such that the ejection angle of the recording sheet with respect to the recording apparatus main body is smaller than or substantially the same as the attachment angle of the ejection tray with respect to the recording apparatus main body.

Effects> In the above means, for example, when inkjet recording is performed as a recording means, even if a curl occurs in the sheet containing ink, the curl is corrected by the discharge rotary member when being discharged.

Furthermore, since the ejection angle of the ejected sheet is the same as or smaller than the installation angle of the eject tray, the leading edge of the ejected sheet is ejected without pushing out the sheets already ejected to the eject tray. Next, an embodiment of the present invention in which the above-mentioned means is applied to a recording apparatus of an ink side recording system will be described.

(First Embodiment) FIG. 1 is a diagram illustrating the configuration of a pair of discharge rollers serving as a rotary discharge body, and FIG. 2 is a diagram illustrating the overall configuration of a recording apparatus using the pair of discharge rollers having the above configuration.

First, the general configuration of the entire recording apparatus will be explained with reference to FIG. is a recording sheet 2 that operates based on a signal from a sheet conveyance means 3 for conveying the recording sheet 2 and a signal from the scanner part 1 and is conveyed by the sheet conveyance means 3;
The recording device 4 is equipped with a recording means 4 for performing recording, and a pair of discharge rollers 5 serving as a discharge rotary body for discharging the sheet 2 after recording. Further, an ejection tray 6 for accommodating the recording sheet 2 ejected by the pair of ejection rollers 5 is attached to the outside of the apparatus main body A at a predetermined angle with respect to the apparatus main body A.

Next, the configuration of each of the above-mentioned parts will be specifically explained.

(Part of Scanner) The scanner part 1 is not shown in detail, but as shown in FIG.
1a, a photoelectric converter 7-1b such as a CCD that reflects light from the original B and receives the light, and a short focus imaging lens 1c that forms an image of the light from the original B on the photoelectric conversion element 1b. The scanner is configured to scan the document B in the direction of the arrow in FIG. 1 to read the information written on the document.

(Sheet Conveying Means) The sheet conveying means 3 conveys recording sheets 2 made of cut sheets stacked and housed in a feeder 3a that is removably loaded into the apparatus main body A along a sheet conveying path. Specifically, as shown in FIG. 2, there is a separation roller 3b for separating the recording sheets 2 in the cassette 3a one by one from the th section, and the recording sheets 2 separated by the separation roller 3b are sent to the recording means 4. A pair of transport rollers 3c to be transported, and further a drive roller 3dl provide a universal conveyor belt 3d.
! This is accomplished by the conveyance section 3d which rotates and applies conveyance force to the recording 5z-)2.

As a result, the recording sheets 1 and 2 are separated one by one from the cassette 3a, guided and fed by the sheet guides 1' and 3c, etc., and placed in the recording means 4 position.
- Synchronize with the recording operation by the transport section 3d. ↓: The pano 12 that has been conveyed and recorded is discharged to the discharge loaf pair 5.

(Recording means) The recording means 4 records a direct image on the recording sheet 2 conveyed by the conveyance means 3 based on the information read by the scanner part 1, and an inkjet recording method is preferably used. It will be done.

The inkjet recording method includes a liquid ejection port for ejecting recording ink liquid as flying droplets, and a
The apparatus includes a liquid flow path that communicates with the liquid flow path, and an ejection energy generating means that is provided in a part of the liquid flow path and provides ejection energy for causing the ink liquid in the wave path to fly. Then, the ejection energy generating means is driven in accordance with the drive signal 1, and ink droplets are ejected to record an image.

As the ejection energy ordering means, for example, a method using a pressure energy generation means such as an electromechanical transducer such as a piezo element, a method of irradiating the ink liquid with electromagnetic waves such as a laser to generate heat, and the ink is caused by the action of the heat generation. There is a method using a 4° electromagnetic energy generating means for ejecting ink, or a method using a thermal energy generating means for ejecting ink by heating the ink liquid with an electrothermal converter. Among these methods, the method of ejecting ink using a thermal energy generating means such as an electrothermal converter has the ability to arrange liquid ejection ports at a high density, making it possible to print with high resolution. This is preferable because it can be made compact.6 In this embodiment, among the inkjet recording methods described above, four line-type recording heads aa each ejecting four color inks of yellow, magenta, cyan, and black are used as recording means. , 4b, 4c, and 4d, and uses a bubble jet recording method that allows color recording.

FIG. 3 is an explanatory diagram of an exploded configuration of the recording head 4a constituting the recording means, and FIGS.

The configuration of the recording head 4a will be explained with reference to FIG.
After going through semiconductor manufacturing processes such as etching, vapor deposition, and sputtering, an electrothermal converter (
A discharger (ejector) 4f and an electrode 4g made of aluminum or the like for supplying power thereto are formed and arranged. A recording nozzle 4a is constructed by adhering to this substrate 4c a top plate 4j having a partition wall 41 for partitioning a recording liquid ink liquid path (nozzle) 4h. Further, an ink cartridge (not shown) for supplying ink to the recording head 4a is replaceably attached to a predetermined position of the apparatus.

The ink supplied from the ink cartridge through the liquid supply pipe 4k is transferred to a connector 4N provided on the top plate 4j.
The common liquid chamber 4m in the recording head 4a is filled with the liquid, and the liquid is guided into each nozzle 4h from this common liquid chamber 4m. These nozzles 4h are provided over the entire width direction of the recording sheet 2, and each nozzle 4h is formed with an ink ejection opening 4n, which is opposed to the recording sheet 2 of the recording head 4a and extends across the sheet width. They are formed at a predetermined pitch in the direction. This allows the multi-nozzle bubble jet recording with ejection ports over the entire recording width to be applied to the rad 4a.
It consists of

Note that the recording heads 4b, 4c, and 4d have the same structure as the head 4a, but the colors of ink supplied thereto are different.

Here, the flying of ink in the bubble jet recording method is described in, for example, US Pat. No. 4,723,129 and US Pat.
Preferably, it is carried out using the basic principles disclosed in the No. 0796 specification.

To briefly explain this with reference to the barrel in Fig. 4(a), in a steady state, as shown in Fig. 4(a), the nozzle 4h
The surface tension and external pressure of the ink 7 filled therein are balanced on the ejection port surface. To make the ink 7 fly in this state, the electrothermal converter 4f in the nozzle 4h is energized to cause the ink in the nozzle 4h to rapidly rise in temperature beyond nucleate boiling.

Then, as shown in FIG. 4(b), the electrothermal converter 4f
The ink adjacent to the fourth part is heated to produce microbubbles, and the ink in the heated part evaporates to cause film boiling.
As shown in Figure (C), the bubbles 8 grow rapidly.

When the bubble 8 grows to its maximum size as shown in FIG. 4(d), an ink droplet is pushed out from the ejection opening in the nozzle 4h. Then, when the electricity supply to the electrothermal converter 4f is finished, the fourth
As shown in Figure (e), the grown bubble 8 is cooled and contracted by the ink 7 in the nozzle 4h, and
The contraction causes ink droplets to fly from the ejection port. Further, as shown in Fig. 4), the ink comes into contact with the surface of the electrothermal converter 4f and is rapidly cooled, and the bubbles 8 either disappear or shrink to an almost negligible volume. When the bubble 8 contracts, ink is supplied from the common liquid chamber 4m into the nozzle 4h by capillary action as shown in FIG. 4 (barrel).
This is to prepare for the next energization.

Therefore, an ink image can be recorded on the recording sheet 2 by conveying the recording sheet 2 and energizing the electrothermal transducer 4f in accordance with a pulse-shaped drive signal in synchronization with this conveyance.

The pulse-shaped drive signal is disclosed in US Pat. No. 446
Those described in Japanese Patent No. 3359 and Japanese Patent No. 4345262 are suitable. and US Pat. No. 43,131 for an invention relating to the rate of temperature rise of the heat acting surface.
If the conditions described in the specification of No. 24 are adopted, even more excellent recording can be performed.

In addition, 40 in FIG. 2 indicates recording heads 4a, 4b, 4c,
4d is a recovery cap part for keeping the head in a recordable state at all times by covering the head part as shown by the two-dot chain line in FIG.

(Recording Sheet) The recording sheet 2 must not bleed when ink adheres to it and cause image blurring, and the adhered ink must be quickly absorbed into its interior, and in particular, ink of different colors must be able to be absorbed within a short period of time. Preferably, the ink does not run out or ooze out even if the ink adheres to the same location twice, and the spread of the image can be suppressed to a level that does not impair the clarity of the image.

The sheet 2 having the above characteristics is disclosed in Japanese Patent Application Laid-Open No. 561485.
It is preferable to use a recording sheet 2 such as that disclosed in Japanese Patent No. 83, which has a base paper coated with a coating (for example, finely powdered silicic acid) that provides the above characteristics.

(Ejection Roller Pair) The ejection roller pair 5 is for ejecting the recording sheet 2 recorded by the recording means 4 to the ejection tray 6, and comes into contact with the front side of the recording sheet 2 as shown in FIG. It consists of a roller pair consisting of an upper roller 5a and a lower roller 5b that contacts the back side.

The upper and lower rollers 5a and 5b are both attached to the shafts 5a+ and 5b in a plurality of divided parts, and a pressing roller part 5at for pressing the recording sheet 2 against the lower roller 5b is formed between the divided upper rollers 5a. The roller part 5az
and the lower roller 5b to move the recording sheet 2 through the r knob A.
Record ・, /-1・2 and Luo 1! (1 piece conveyance force?=j
There are configurations 5 and 7.

Also, the above 1-, rz-e5a and F-t7-'f15 b
T! It is arranged in a comb-teeth shape with a very different shape, and the outer diameter of the above-mentioned sleeve 5a is the pressing area. It is configured to be larger than the Shimunori I diameter. Dirt (from the above discharge I
Record of passing through torso pair 5, front edge of I.2 91
-7 The lower roller 5b is pressed toward the t side than the outer circumference of the lower roller 5b and subjected to wave-shaped deformation. Therefore, the sheet 2 becomes difficult to bend in the discharge direction δ, and as shown in FIG. is removed and 121 outputs [・Discharged to Reiro.

Further, the ejection tray tray is attached to the main body A of the recording apparatus at a predetermined angle α. The configuration is such that the ejection angle β of the recording sheet 2 ejected by the ejection roller pair 5 with respect to the apparatus main body A is smaller than or the same as the attachment angle α of the ejection 1. has been done.

Here, if we assume that the discharge angle 1°C - β is larger than the former angle α of the discharge toshi 1, 6, (α<β), Sliding r; I'lru51
1 record so) 2 is curl [, if there is no one, 1. ``This, the tip of Sea I・2)) < Ejection 1- L noi (Touching i 4-Yo-'') (1 Kanaru. This way) Continuous ejection wojko・), ・The 1st sheet is ejected (Sheet 2 is ejected while sliding on the ray (i), but from the 7th sheet onwards, the tip of the sheet 2 that is being ejected comes into contact with the sheet that is already being ejected, and the friction coefficient between the tray and sheet 2 is lower than the sheet Since the coefficient of friction between the two sheets is larger, the knee sheet 2 pushes out the first sheet 1, φJ'9.

On the other hand, if the angle α and the at exit angle β are set in the relationship α≧β as shown in FIG. Such inconvenience! 1:1'' continuous discharge is carried out effortlessly.

[Other Examples]

As mentioned above and in the embodiment, there is one discharge roller 5a and five pairs of rollers 5a.
7 shows an example in which the pressing roller portion 5a□ is provided.

The pressing roller portion 5a does not necessarily need to be provided with L2. For example, as shown in FIG. 'F roller 5a 5
If the recording sheet 2 is ejected only using b, the sheet conveying force will be weaker than in the first embodiment, but strong pressure will not be applied when giving the sheet 2 a wave-shaped deformation, and no roller marks will be left. There will be no.

Furthermore, as shown in FIG. 8, among the J-lower rollers 5a and 5b that are arranged separately, the roller diameters at both ends in the sheet width direction are configured to be larger than the roller diameter D2 at the center, and By causing both ends of the recording sheet 2 in the width direction to undergo upward wave-like deformation, it is possible to more effectively remove the downward curl toward the discharge tray 6.

Furthermore, in the embodiment described above, the troller 5 is used as the discharge rotating body.
Although roller-shaped rollers such as the roller a and the lower roller 5b are illustrated, these do not necessarily have to be roller-shaped, and may be configured to rotate an endless belt, for example.

Further, in the above-mentioned embodiments, an inkjet recording method was exemplified as a recording means, but the recording means according to the present invention need not be limited to the above-mentioned recording method.
Various methods can be used, such as a recording method, a leisurely recording method, or an electrophotographic recording method.

<Effects of the Invention> The present invention is as described above (i.e., the ejecting rotor is configured in a comb-like V configuration 7, and the ejecting angle of the recording sheet is approximately the same as or smaller than the mounting angle of ejecting units 1 and 2). Due to this structure, the curl of the discharged sheet can be effectively removed and the sheet can be reliably discharged to the discharge tray even during continuous discharge.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of a discharge rotary body according to an embodiment of the present invention, and Fig. 2 is a bubble jeso using the sliding rotary body.
Fig. 3 is an explanatory diagram of the configuration of the recording device of the recording method, and Fig. 3 is an explanatory diagram of the configuration of the recording gutter. 6 and 6 are explanatory diagrams of the relationship between the ejection angle of the recording sheet and the take-up angle of the ejection tray, FIGS. 7 and 8 are explanatory diagrams of other embodiments of the ejection roller pair, and FIG. It is an explanatory diagram when the discharge sheet curls downward. 1 is a part of the scanner, 1a is a light source, 1b is a photoelectric conversion element,
1c is a lens, 2 is a recording sheet, 3 is a sheet conveyance means,
3a is a cassette, 3b is a separation roller, 3c is a conveyance roller pair, 3d is a belt conveyance section, 3dl ctN moving roller, 3
d4 is an endless belt, 3e is a sheet guide, 4 is a recording means, 4a to 4d are recording heads, 4e is a silicon substrate, 4f is an electrothermal converter, 4g is an electrode, 4h is a nozzle, 4
1 is a partition wall, 4j is a top plate, 4 is a liquid supply pipe, 41 is a connector, 4m is a common liquid chamber, 4n is an ink discharge port, 4o is a recovery cap part, 5 is a pair of discharge rollers, 5a is an upper roller, 5
b is a lower roller, 5a and 5b+ are shafts, 5az is a pressing roller portion, 6 is a discharge tray, 7 is ink, and 8 is a bubble.

Claims (5)

[Claims] (1) a sheet conveyance means for conveying the recording sheet;
a recording means for recording on the conveyed recording sheet; a discharge rotary body for discharging the recording sheet after recording; and a discharge tray attached thereto, the recording sheet is configured to correct the curl of the recording sheet by the discharge rotating body, and the discharge angle of the recording sheet with respect to the recording apparatus body is smaller than the attachment angle of the discharge tray with respect to the recording apparatus body, or A recording device characterized in that the configurations are substantially the same. (2) The recording apparatus according to claim 1, wherein the recording apparatus is an inkjet recording system in which the recording means performs recording by ejecting ink in response to a signal. (3) In the recording device, the recording means energizes the electrothermal transducer in response to a signal, and the ink is ejected from the ejection port by the growth of bubbles generated by heating exceeding film boiling by the electrothermal transducer, thereby recording. 3. The recording apparatus according to claim 2, which is a bubble jet recording method. (4) The recording device is characterized in that the discharge rotary body is composed of an upper roller and a lower roller that contact the front and back surfaces of the recording sheet, and the upper roller and the lower roller are arranged in a comb-teeth shape. (1) Recording device as described. (5) The recording device is configured to apply wave-shaped deformation to the recording sheet discharged by the upper roller and the lower roller, and to deform both ends of the recording sheet in the width direction in a direction opposite to the discharge tray side. The recording device according to claim 4, characterized in that: