JPH0640637A - Paper discharging device for printer - Google Patents

Abstract

PURPOSE:To prevent the ink-spotting of a printed paper and to surely discharge it to a paper receiving section. CONSTITUTION:A paper discharging device of a printer has a downstream paper guide face 31 which is arrangedly provided extending over a range having a fixed length between a paper discharging roller 11 and a paper receiving section 15 and leads the paper in a paper discharging direction, and a paper discharging arm 21 which, after the rear end of a printed paper attains to the paper discharging roller 11, pushes the above rear end to feed a printed paper to the paper receiving section 15, and after feeding, returns to a stand-by position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge device for a printer (especially an ink jet printer).

[0002]

2. Description of the Related Art For example, a conventional configuration of an ink jet printer is shown in FIG. In the figure, 2 is a print head (inkjet head). Inkjet head 2
Is reciprocally moved by a carrier (not shown) in a direction orthogonal to the paper surface in the drawing, and ink droplets are ejected onto the paper P to enable printing.

A feed roller 3 cooperates with the leaf plate 4 to feed the paper in the paper tray 6 or the manual paper to the ink jet head 2.

Further, 10A is an ink jet head 2
This is a paper discharge device for discharging the paper P (printed paper) printed by. The paper discharge device 10A includes a paper discharge roller 11 capable of feeding and urging the printed paper P in the paper discharge direction (arrow E direction), a pressing body (12) for pressing the printed paper against the paper discharge roller 11, and a paper discharge device. The sheet receiving unit 15 is arranged downstream of the sheet roller 11 and is capable of receiving a printed sheet. Specifically, the paper discharge roller 11 is provided rotatably in the arrow direction downstream of the inkjet head 2 in the paper transport direction. The pressing body (12) is
The printed paper P is provided so as to be able to be pressed against the paper discharge roller 11 by utilizing a spring force or the like. Usually, the pressing body is formed of a spur 12 having a serrated outer peripheral surface with a small contact area with the paper P in order to prevent transfer of ink from the printed paper P.

However, the printed paper is ejected by the paper ejection roller 11
By the cooperation of the spur 12 and the spur 12, the paper is discharged to the paper receiving portion 15 with the printing surface facing up.

[0006]

By the way, in the above-described paper discharge device 10A of the printer, the printed paper P urged by the paper discharge roller 11 is already stored in the paper receiving portion 15 and is printed. The printed surface of the paper P slides and is discharged to the receiving portion 15. Therefore, when the ink is in a semi-dried state, there arises a problem that the printing surface of the previous printed paper P and the back surface of the next printed paper P are soiled. Nowadays, various kinds of inks are selectively switched and used with further increase in printing speed and diversification, and this problem becomes more prominent.

Further, the trailing edge of the printed paper P is the paper discharge roller 1.
After reaching 1, the sheet P is no longer pressed by the spur 12 against the sheet discharge roller 11, so that the feeding bias by the roller 11 is disabled and the sheet cannot be smoothly discharged to the sheet receiving portion 15. There is.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a paper discharge device for a printer, which can prevent a printed paper from being contaminated with ink and reliably discharge it to a paper receiving portion.

[0009]

SUMMARY OF THE INVENTION A paper discharge device for a printer according to the present invention includes a paper discharge roller capable of feeding and biasing a paper printed by a print head in a paper discharge direction, and a paper discharge roller disposed downstream of the paper discharge roller. In a paper ejecting device of a printer having a paper receiving portion provided and capable of accommodating printed paper, the paper is disposed in a predetermined length range between the paper ejecting roller and the paper receiving portion, and the paper is ejected in the paper ejecting direction. The guideable downstream paper guide surface and the trailing edge of the printing sheet can reach the sheet ejection roller after the trailing edge of the printing sheet reaches the sheet ejection roller, and the printed sheet can be fed to the sheet receiving section And a discharge arm provided so as to be capable of returning to the position.

[0010]

In the present invention having the above-described structure, the paper (printed paper) printed by the print head is urged by the paper ejection roller in the paper ejection direction. The printed paper portion sent out from the paper discharge roller is continuously guided in the paper discharge direction by the downstream paper guide surface.

After the rear end of the printed paper reaches the paper ejection roller, the paper ejection arm presses the rear end of the paper and conveys it to the paper receiving portion.

As described above, the printed paper portion sent from the paper discharge roller is not immediately sent to the paper receiving portion, but is sent to the paper receiving portion after being guided in the paper discharge direction by the downstream paper guide surface. Therefore, it is possible to prolong the time from when the printed paper starts to be urged by the discharge roller until it comes into contact with the printing surface of the previous printed paper stored in the paper receiving section, and after the contact, The distance over which the printed surface slides can be shortened. As a result, it is possible to effectively prevent ink stains on the printing surface of the printed paper.

Further, after the completion of the urging of feeding the printed sheet by the sheet discharging roller, the sheet is sent to the sheet receiving section by the sheet discharging arm, so that the sheet can be smoothly and surely discharged to the sheet receiving section.

As described above, the printed paper can be reliably discharged to the paper receiving portion while preventing the ink from being contaminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The paper discharge device 10 according to the present embodiment is applied to an inkjet printer, and as shown in FIGS.
Paper discharge roller 11, pressing body (spur 12), paper receiving portion 1
5, the paper guide 19, the paper discharge arm 21, and the downstream paper guide surface 31. The same parts as those in FIG. 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

Here, the downstream side paper guide surface 31 is arranged over a predetermined length range between the paper discharge roller 11 and the paper receiving portion 15, and the paper P is discharged in the paper discharge direction (arrow E direction). It is formed so that it can be guided. In this embodiment, the length L of the downstream paper guide surface 31 in the paper discharge direction is formed as long as possible within a range that does not hinder the paper discharge operation of the paper discharge arm 21. A paper guide surface 19 that also serves as a printing plate for guiding the paper to the paper discharge roller 11 is formed between the paper discharge roller 11 and the feed roller 3.

Further, the paper discharge arm 21 presses the rear end of the printed paper P after the rear end of the printed paper P reaches the paper discharge roller 11 to receive the printed paper P via the downstream paper guide surface 31. It is provided so that it can be fed to the section 15 and can be returned to the standby position outside the sheet transport path after the feeding. In the present embodiment, as shown in FIGS. 1 to 3, a plurality of paper discharge arms 21 are arranged at predetermined intervals in a direction orthogonal to the paper transport direction and are provided so as to be rotatable about a support shaft 25 in a synchronous manner. Has been.
A paper pressing portion 22 is formed at the tip of the paper discharge arm 21. Here, the “standby position” means that the paper pressing portion 22 of the paper discharge arm 21 is located closer to
It is a position that is in the middle lower part. The ejection arm 21 has a spring 26.
Is always urged toward the standby position, and is pressed by the positioning member 27 to be positioned and held at the standby position.

Further, the paper discharge arm 21 is rotated by a predetermined angle amount in the clockwise direction in FIG. 1 from the standby position while resisting the urging force of the spring 26 by an arm driving means 41 having an intermittent gear and a stepping motor (not shown). It is configured to be moved. The arm drive means 41 is configured to be driven by utilizing a partial function of a control device 51 that controls the drive of the entire printer. Then, the printed paper P
When a paper detection sensor (not shown) detects that the rear end of the paper ejection roller 11 has come off, the control device 51 causes the paper ejection arm 21 to rotate in the clockwise direction in FIG. 1 from the standby position by a predetermined angle amount. The arm drive means 41 is drive-controlled to be moved. By the rotation of the paper discharge arm 21, the printed paper P is pushed to the paper receiving portion 15 with its rear end pressed. The paper discharge roller 11 is arranged such that the distance between the paper discharge roller 11 and the feed roller 3 is short so that the paper can be discharged smoothly and reliably.

Next, the operation will be described. Paper (printed paper) P printed by the inkjet head 2
Is pressed by the spur 12 against the paper discharge roller 11 and is urged to be fed in the paper discharge direction (E direction) by the paper discharge roller 11. The portion of the printed paper P sent out from the paper discharge roller 11 is continuously guided in the paper discharge direction by a predetermined distance (L) by the downstream paper guide surface 31.

When the trailing edge of the printed paper P reaches the paper ejection roller 11 and comes off, the paper ejection arm 21 is driven by the arm drive means 41 to move from the standby position shown in FIG. 1 to the position shown in FIG. It is rotated. Accordingly, the rear end of the printed paper P is pushed by the paper pressing portion 22 of the paper discharge arm 21 and is sent to the paper receiving portion 15.

As described above, the printed paper P portion sent from the paper discharge roller 11 is not immediately sent to the paper receiving portion 15, but is discharged by the downstream paper guide surface 31 by a predetermined distance (L) in the paper discharge direction ( Since it is fed to the paper receiving portion 15 after being guided in the E direction), from when the feeding roller 11 starts to urge the feed until it contacts the printing surface of the previously printed paper P stored in the paper receiving portion 15. The time can be extended. Therefore, the printed paper P comes into contact with the place where the ink is fixed on the printing surface of the previous printed paper P, and the distance that slides on the printing surface after the contact becomes short.

As a result, it is possible to effectively prevent ink stains on the printing surface of the printed paper P. Further, after the urging of the feeding of the printed paper P by the paper ejection roller 11 is completed, the paper P is fed by the paper ejection arm 21 to the paper receiving portion 15, so that the paper P is smoothly and reliably accommodated in the paper receiving portion 15.

However, according to this embodiment, the printed paper P is disposed in the paper discharge direction (E direction) over the predetermined length range between the paper discharge roller 11 and the paper receiver 15. After the guideable downstream paper guide surface 31 and the trailing end of the printed paper P reach the paper discharge roller 11, the trailing end is pressed to feed the printed paper P to the paper receiving portion 15 and after the feeding is completed. Since the paper discharge arm 21 is provided so as to be able to return to the standby position, the printed paper P can be reliably discharged to the paper receiving portion 15 while preventing ink stains.

[0024]

According to the present invention, the downstream side paper guide surface which is disposed between the paper discharge roller and the paper receiving portion over a predetermined length range and which can guide the paper in the paper discharge direction, and the printing. After the rear end of the finished paper reaches the paper ejection roller, the rear end is pressed to feed the printed paper to the paper receiving portion, and after the completion of the feeding, the paper ejection arm is provided. With the configuration, the printed paper can be reliably discharged to the paper receiving portion while preventing ink stains.

[Brief description of drawings]

FIG. 1 is a diagram for explaining an essential part of an embodiment of the present invention.

FIG. 2 is a diagram for explaining a sheet discharging operation of a sheet discharging arm according to an embodiment.

FIG. 3 is a perspective view showing an appearance of an embodiment.

FIG. 4 is a diagram for explaining a schematic configuration of an inkjet printer to which a conventional paper discharge device is applied.

[Explanation of Codes] 2 Inkjet Head (Printing Head) 10 Paper Ejecting Device 11 Paper Ejecting Roller 12 Spur (Pressing Body) 15 Paper Receiving Section 21 Paper Ejecting Arm 31 Downstream Paper Guide Surface

Claims (1)

[Claims] 1. A paper ejecting roller capable of feeding and urging a paper printed by a print head in a paper ejecting direction, and a paper receiving portion arranged downstream of the paper ejecting roller and capable of accommodating a printed paper. In the paper ejection device of the printer, a downstream paper guide surface that is arranged between the paper ejection roller and the paper receiving part over a specified length range and that can guide the paper in the paper ejection direction, and the trailing edge of the printing paper. And a discharge arm which is provided so as to press the rear end of the discharge roller to feed the printed sheet to the sheet receiving section and to return to the standby position outside the sheet transport path after the feeding is completed. A paper ejection device for a printer, which is characterized in that