JPH03143865A - Discharged paper stacker in recording device - Google Patents

Abstract

PURPOSE:To prevent sheets from coming into contact with each other immediately after discharge so as to secure the time for drying ink and prevent the sheets from being soiled by recessing a discharged paper tray with respect to the recording surface of sheets in a recording device which performs recording on sheets by means of injection of drops of ink. CONSTITUTION:A discharged paper tray 6 slanting to the rear side of a recording device and recessed to the front side in the vertical direction is provided on the front face of the pair of paper discharge rollers 4, 5 of a paper discharge opening 3. Sheets P1 already discharged are accumulated with their recording surface recessed along the form of the discharged paper tray 6, while a sheet P2 being discharged is plane; so the sheets P1 and P2 do not come into contact with each other until ink just used for printing is dried. Also a roller 5a provided on the side of the recording surface of sheets is smaller in diameter at the center side than at the peripheral side thereof so that sheets are discharged with their recording faces projected; or a spur 4b is provided with a flange 4c so that the sheets are discharged while being corrugated in the direction perpendicular to that in which sheets are discharged, thereby further extending the time that elapses before the sheets come into contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a recording device that records on a sheet by ejecting ink droplets, and more particularly relates to a paper discharge stacker that discharges sheets of the recording device. .

(b) Prior Art Conventionally, in so-called inkjet printers that eject ink droplets to record on a sheet, a special sheet with high water absorption has been used to supplement the printing performance.

However, in recent years, there has been a strong demand for the use of plain paper, and in order to ensure the printing characteristics of plain paper, such as feathering, drying time, density, water resistance, light resistance, etc., it is necessary to improve the ink itself or improve the recording device. Improvements have been made.

Among these printing characteristics, especially regarding drying time, there is a limit to the improvement on the ink side in terms of print quality and reliability of the nozzle that ejects ink droplets, and in many cases countermeasures are taken on the device side.

For example, in the case shown in FIG. 6, the guide member C is narrowed so that the sheet a discharged after printing does not come into contact with the sheet b that has been printed before and is stacked on the stacker. A proposal has been made to "receive the incoming sheet a, and after a predetermined time, fold the guide member C and let it fall onto the stacker, thereby ensuring drying and clear weather and eliminating stains caused by rubbing of the sheets a and b." was.

(C) Problems to be Solved by the Invention However, the above-mentioned conventional proposal requires a guide member C that temporarily holds the sheet a on the stacker, and also requires a mechanism to drive this guide member C. There were drawbacks such as increased cost and the size of the sheet a was limited due to its structure.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a recording apparatus which is inexpensive and does not get dirty by making the paper ejection tray concave in shape.

(d) Means for Solving the Problems The present invention has been made in view of the above-mentioned circumstances, and as shown, for example, with reference to FIGS. 1 and 2, a sheet (PI, pt ) In a paper ejection stacker (7,) equipped with a paper ejection roller pair (4, 5) and a paper ejection tray (6) in a recording device (1) that records an image on a recording surface of the sheet (p tP2), On the other hand, it is characterized by a concave shape.

Further, among the rollers (5) on the recording surface side of the sheet (P,) of the pair of paper ejection rollers that eject the sheet (P2), the center roller is formed to have a smaller diameter than the peripheral rollers. It is characterized by

Further, a pair of paper ejection rollers (4) eject the sheet (P2).
, 5) is characterized in that the sheet (P2>) is discharged in a corrugated manner in a direction perpendicular to the discharge direction of the sheet (P2>).

(E) Function Based on the above configuration, the recording device (1) jets liquid to record an image on the sheet, and the sheet (Pl, Pl)
A pair of paper ejection rollers (4, 5) of a paper ejection stacker ejects the paper to a paper ejection tray (6)c.

At this time, the sheet (P,) is discharged to a paper discharge tray (6) that is concave with respect to the recording surface of the sheet (P2>).

Further, the sheet ejection roller pair (4, 5) is formed such that the center side of the roller (5) on the sheet recording surface side has a small diameter, and the peripheral side has a large diameter.
), the sheet (P2) is ejected with the recording side thereof having a convex shape.

Further, the sheet (P2) is discharged in a wave shape in a direction perpendicular to the discharge direction. .

Note that the symbols in parentheses are just examples and do not limit the configuration in any way.

(f) Example The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which 1 is a recording device;
A paper ejection roller pair consisting of a peel wheel 4 and a rubber roller 5 is provided at a paper ejection port 3 on the upper surface of the main body of the apparatus 2, and a paper ejection tray 6 that is inclined toward the front side of this roller pair is provided. The paper discharge tray 6 is formed in a vertically concave shape with respect to the front side.

Note that a paper discharge stacker 7 is constituted by the paper discharge tray 6 and the roller pair 4.5.

Thus, in FIG. 2, Pl is a sheet that has already been ejected onto the ejection tray 6, and P2 is a sheet that is being ejected.

The sheets P1 discharged onto the paper discharge tray 6 are stacked along the paper discharge tray 6 with their recording surfaces concave. The sheet P2 that is being ejected has a flat shape.

Therefore, the flat sheet P2 that is being ejected does not come into contact with the concave sheet P1 for a while, and the print dries during that time.

Next, another embodiment will be described with reference to FIG.

In this embodiment, the rubber roller 5a has a central roller with a small diameter and rollers on both sides with a large diameter.
In correspondence with the rubber roller 5a, the roller at the center is formed to have a large diameter, and the rollers at both ends are formed to have a small diameter.
The top surface is the recording surface.

Therefore, with respect to the sheets P stacked on the paper output tray 6 shown in FIG. 2, the interval at the center is larger than that of the flat sheet P2, and it takes time for the sheet P2 to align with the sheet applicant. The drying time for printing can be extended.

Next, still another embodiment will be described with reference to FIG.

In this embodiment, flanges 4 are provided on both sides of the roller 4b.
C is provided, and the sheet P2 is transferred to the roller 4 by the rubber roller 5b.
When the sheet P2 is pressed at approximately the center of b, the sheet P2 is discharged in a wave shape in a direction perpendicular to the discharge direction.

Therefore, the time it takes to stiffly attach the sheet P2 and make it conform to the sheet P1 already stacked on the paper output tray 6 is longer than for the flat sheet P2, and the drying time for printing is longer. can be made longer.

Next, another embodiment will be described with reference to FIG.

In this embodiment, a tray 6a is used instead of the paper discharge tray 6 shown in FIG. This tray 6a has a bottom plate 6.
Ribs 6c, 6d, 6 which become longer in order from the center side on b
e is set upright, and when sheets P2 are stacked, the recording surface becomes concave, that is, the recording surface becomes concave.

(g) As described in detail, according to the present invention, the paper ejection tray is formed in a concave shape with respect to the recording surface of the ejected sheet, and the ejected sheet is ejected in a flat shape. Since the flat sheet does not come into contact with the sheets stacked on the paper ejection tray for a while, the print dries during that time and the recording surface can be prevented from becoming smeared. In addition, since the paper ejection tray is formed in a concave shape, the stacked sheets become concave and stiff, so the length of the paper ejection tray is shortened.
Cost can be reduced.

Further, by making the recording surface convex and discharging the sheet, the time until it comes into contact with the sheet placed on the S can be further lengthened, and staining of the sheet can be further prevented.

Further, by discharging the sheet in a corrugated manner, the sheet is made stiffer and stronger, so that the time required for contact with the sheet being discharged is lengthened, and staining of the sheet can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a state in which sheets are ejected and stacked, FIG. 3 is a cross-sectional front view of another embodiment, and FIG. FIG. 5 is a sectional front view of another embodiment, FIG. 5 is a perspective view of another embodiment, and FIG. 6 is a sectional front view showing the operation of a conventional paper discharge stacker.

Claims (1)

[Scope of Claims] 1. In a paper ejection stacker equipped with a paper ejection roller pair and a paper ejection tray in a recording apparatus that records an image on a sheet by ejecting liquid, the sheet is formed in a concave shape with respect to the recording surface of the sheet. A paper discharge stacker for a recording device, characterized in that: 2. A sheet discharge stacker in a recording apparatus according to claim 1, wherein a center roller among the rollers on the recording surface side of the sheet of a pair of sheet discharge rollers for discharging the sheet is formed to have a smaller diameter than a peripheral roller. 3. A sheet discharge stacker in a recording apparatus according to claim 1, wherein the sheet discharge roller pair for discharging the sheet discharges the sheet in a wave shape in a direction perpendicular to the sheet discharge direction.