JP3075845B2 - Paper ejection device of inkjet printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention is, the ink-jet pudding
The present invention relates to a paper discharge device of a printer.

[0002]

The conventional structure of the Related Art inkjet cartridges shown in FIG. In the figure, reference numeral 2 denotes a print head (inkjet head). The inkjet head 2 is reciprocally moved by a carrier (not shown) in a direction perpendicular to the plane of the paper in the figure, and is configured to eject ink droplets onto a sheet to enable printing.

Reference numeral 3 denotes a feed roller, which is capable of feeding cassette paper and manual paper stored in a paper tray 6 to the ink jet head 2 in cooperation with a leaf plate 4. Specifically, the feed roller 3 is provided so as to be rotated in the direction of the arrow and to feed the paper pressed by the leaf plate 4 to the inkjet head 2 so as to urge it.

[0004] Also, 10A is an ink jet head 2
This is a paper discharge device for discharging paper (printed paper) printed on the paper. The paper discharge device 10A includes a paper discharge roller 11 that can feed and urge a printed paper in a paper discharge direction (arrow E direction), and a pressing roller 12 that presses the printed paper against the paper discharge roller 11. I have. In particular,
The paper discharge roller 11 is provided rotatable in the arrow direction downstream of the inkjet head 2 in the paper transport direction. The pressing roller 12 is provided so as to press the printed paper against the paper discharging roller 11 by using a spring force or the like.
Normally, the pressing roller 12 is formed of a spur having a sawtooth-shaped outer peripheral surface having a small contact area with the paper in order to prevent transfer of ink from the printed paper. Thus, the printed paper is discharged to the paper receiving portion 15 with the printing surface facing up by the cooperation of the discharge roller 11 and the pressing roller 12.

[0005] In FIG. 8, reference numeral 19 denotes a paper guide which also serves as a stamp stand, and is provided so as to support the paper in a planar shape and to be able to guide the paper to the paper discharge roller 11.

[0006]

The object of the invention is to be Solved by the way, Lee described above
In the paper ejection device of the ink jet printer, the printed paper fed and urged by the paper ejection roller 11 already has the paper receiving unit 15.
The paper is slid on the printing surface of the previously printed paper accommodated in the printer and discharged to the receiving portion 15. Therefore, when the ink is in a semi-dry state, there is a problem that the printing surface of the previous printed sheet and the back surface of the next printed sheet become dirty. At present, various kinds of inks are selectively used in accordance with a further increase in printing speed and diversification, and this problem becomes more remarkable.

[0007] Therefore, there has been proposed a printer configured to be able to discharge the printed paper P without contacting the printing surface of the printed paper P (US Pat. No. 4,728,963). As shown in FIGS. 9 and 10, the paper discharge mechanism of such a printer is provided with a printing stand 19A rotatably in the direction of the arrow, and the printed paper P on the downstream side of the print head 2 with the printing surface horizontal. An upper rail 9A of a paper receiving portion that can be temporarily placed is provided, and at the time of discharging the paper, the stamp base 19A is rotated in the direction of an arrow, so that the paper P is stored under the upper rail 9A by utilizing its own weight or the like. (Not shown). However, in such a configuration, the ratio of the paper receiving portion 9A to the installation area of the printer is increased, and the printer becomes large in size, which makes it impossible to meet the current demand for downsizing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper discharge device for an ink jet printer which can smoothly discharge a printed paper while preventing dirt on a print surface while reducing the size in view of the above circumstances.

[0009]

Means for Solving the Problems] i according to the invention of claim 1
The paper ejection device of the ink jet printer includes a paper ejection roller capable of feeding and energizing the paper printed by the print head in the paper ejection direction, a pressing roller pressed against the paper ejection roller, and a downstream of the paper ejection roller. A paper receiving portion provided so as to be able to store the printed paper in a state inclined with respect to the horizontal direction, and a printed paper portion disposed between the paper discharging roller and the paper receiving portion and sent from the paper discharging roller. Paper bending means for bending in a direction perpendicular to the paper discharge direction, a paper discharge arm capable of conveying the paper to the paper receiving portion by pressing the rear end after the rear end of the printed paper reaches the paper discharge roller, It is characterized by having.

The ink jet printer according to the second aspect of the present invention.
Paper discharge device of bets printer, in addition, the pressing roller,
It is characterized by comprising a plurality of pressing roller forming parts which are arranged at a predetermined distance from each other along the axis of the paper discharge roller and are pressed independently against the paper discharge roller.

[0011]

According to the first aspect of the present invention, the printed paper portion fed from the paper discharge roller is curved by the paper bending means in a direction perpendicular to the paper discharge direction. As a result, the second moment of area of the printed paper portion increases, and the resistance to bending in the paper discharge direction increases. Therefore,
The printed paper portion does not hang down due to its own weight, and can be discharged without sliding the printed surface of the previous printed paper already stored in the paper receiving portion.

Further, since the paper receiving section accommodates the printed paper in a state inclined with respect to the horizontal direction, the projected area of the accommodated paper with respect to the horizontal plane is reduced, and the installation space can be saved.

As described above, the printed paper can be smoothly discharged while preventing the printed surface from being stained while reducing the size.

According to the second aspect of the present invention, when the printed paper is strong such as thick paper or an envelope, the paper is not only a downstream portion but also an upstream portion of the paper bending means. Are also considerably curved. for that reason,
Of the pressing roller forming portions disposed upstream of the sheet bending means, the pressing roller forming portion that comes into contact with both sides of the sheet, particularly the degree of deformation is raised by the sheet,
In some cases, the force of pressing the paper against the paper discharge roller is weakened. However, the other pressing roller presses the sheet with a sufficient force against the discharge roller without being affected by the raised pressing roller. Therefore, the printed paper can be sufficiently fed and urged by the discharge roller.

As a result, even if the printed paper has a strong stiffness, the printed surface can be prevented from being stained and the paper can be discharged more smoothly while the size is reduced.

[0016]

An embodiment of the present invention will be described with reference to the drawings. (First Embodiment) A paper discharging apparatus according to the present embodiment is applied to an ink jet printer, and as shown in FIGS. 1, 2 and 7, a paper discharging roller 11, a pressing roller (1
2), paper receiving section 15, paper guide 19, paper discharge arm 2
1 and the sheet bending means 50.

In FIG. 7, reference numeral 8 denotes a carrier for reciprocating the ink jet head 2 in the axial direction of the carrier shaft 8a. In addition, the same parts as those in FIG. 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.

Here, the pressing roller is formed of a spur 12 having a sawtooth outer peripheral surface having a small contact area with the paper in order to prevent the transfer of ink from the printed paper. As shown in FIG. 2, the spur 12 enables the printed paper to be pressed against the paper discharge roller 11 with a uniform force in the paper width direction, and the paper is deformed and interferes with a component (for example, the cartridge of the inkjet head 2). At least three (six in this embodiment) are provided along the axis of the paper discharge roller 11 so as not to cause ink contamination or the like. Each spur 1
2 is rotatably provided on the main body 1 via the support shaft 12a.

The paper receiving unit 15 is provided with the paper discharge rollers 11.
The printed paper P is arranged downstream of the printer and can be accommodated in a state where it is inclined with respect to the horizontal direction. This allows
The projected area of the storage paper P with respect to the horizontal plane is reduced, so that the installation space can be saved.

Further, after the trailing end of the printed paper P reaches the discharge roller 11, the paper discharging arm 21 can press the trailing end to transport the printed paper P to the paper receiving portion 15 and after the transport is completed. It is provided so as to be able to return to the standby position. The paper discharge arm 21 is driven by arm driving means (not shown).

Further, the sheet bending means 50 is provided with the sheet discharging roller 1.
This is a means provided between the sheet receiving portion 15 and the paper receiving portion 15 to bend the portion of the printed paper P sent from the paper discharge roller 11 in a direction orthogonal to the paper discharge direction (the direction of arrow E). In this embodiment, as shown in FIG. 2A, the sheet bending means 50 includes inclined portions 51, 51 provided at both left and right ends of the sheet guide 19 downstream of the sheet discharge roller 11, and the sheet discharge roller 1 as shown in FIG.
1 and a pressing roller 12. As shown in FIGS. 2 (a) and 2 (b), each inclined portion 51 has a paper discharge direction (arrow E direction), a discharge roller 11 axial direction (J direction), and arrows E and an arrow K direction orthogonal to the J direction. Are formed so as to be inclined with respect to any of the above.

As shown in FIGS. 2 (a) and 2 (b), the portion of the printed paper P sent from the paper discharge roller 11 is directed by the paper bending means 50 in a direction orthogonal to the paper discharge direction (E direction). Curved. As a result, the second moment of area of the printed sheet P increases, and the resistance to bending in the longitudinal direction (that is, the E direction) of the sheet P increases.
Therefore, the portion of the printed paper P does not hang down due to its own weight, and is discharged without sliding on the printing surface of the previously printed paper P already stored in the paper receiving portion 15.

Next, the operation will be described. Discharge roller 1
The portion of the printed paper P sent from 1 is bent by the paper bending means 50 in a direction orthogonal to the paper discharge direction (E direction). This increases the resistance of the printed paper P to bending, so that the printed paper P does not hang down due to its own weight, and is discharged without sliding on the printing surface of the previously printed paper P already housed in the paper receiving unit 15. Paper.

Further, since the paper receiving section 15 stores the printed paper P in a state inclined with respect to the horizontal direction, the projected area of the stored paper P with respect to the horizontal plane is reduced, so that the installation space can be saved.

As described above, the printed paper P
Can be discharged smoothly by preventing the printing surface from being stained.
In addition, the paper discharge arm 11 applies vibration to the paper being printed.
So that ink droplets can fly and adhere to the paper
Printing may be disturbed even with an inkjet printer
No printing quality can be maintained. Also, the paper ejection arm
11 scratches the back side of the paper during printing or after printing,
Since the paper itself does not push up, use ink
There is no danger of the wet paper being torn.

(Second Embodiment) This paper discharge device 10 '
As shown in FIGS. 3 to 6, the pressing roller is connected to the discharge roller 11.
A plurality of pressing roller forming portions (six independent spurs 13 in this embodiment) which are arranged at a predetermined distance from each other along the axis of It is characterized by.

The other components such as the sheet receiving portion 15 and the sheet discharging arm (not shown) are the corresponding components (the sheet receiving portion 15, the sheet discharging arm 21 and the like) of the sheet discharging device 10 of the first embodiment. ), The description is omitted.

In the present embodiment, as shown in FIG. 3, each independent spur 13 is moved along the axis of the paper discharge roller 11 (ie,
It is arranged so as to be separated by a predetermined distance (in the direction of arrow J) and is configured to be independently pressed against the paper discharge roller 11.

More specifically, each independent spur 13 is shown in FIG.
As shown in FIG. 6, the shaft 13a is integrally formed, and the shaft 13a is slidably fitted in a slide groove 17 formed in the spur holder 16. The shaft 1
3 a may be formed separately from the independent spur 13. The spur holder 16 is detachably mounted on a predetermined portion of the main body 1. Thereby, any independent spur 13
Can be approached / separated from the paper discharge roller 11 without being affected by other independent spurs 13.

Each of the independent spurs 13 is configured to be pressed against the paper discharge roller 11 by a leaf spring 18 at a predetermined pressure. The leaf spring 18 is attached to the spur holder 16 so as to allow the shaft portion 13a of the independent spur 13 to rotate freely while allowing the shaft portion 13a to freely rotate. Further, the position of the left and right concave portions and the left and right outer ends of the leaf spring 18 is regulated by the convex portion 16a of the spur holder 16, and when the independent spur 13 is attached to the spur holder 16, the leaf spring 18 bends out of the holder 16. There is no structure.

The spur holder 16 has a plurality of claws 16 for regulating the position of the independent spurs 13 so that the spurs 13 do not shift when the holder 16 is removed from the main body 1.
b is provided.

When the printed paper is stiff, such as a thick paper or an envelope, the paper is curved not only downstream but also upstream by the paper bending means 50 to a considerable extent. Therefore, of the independent spurs 13 disposed upstream of the sheet bending means 50, the independent spurs 13 that come into contact with both sides of the sheet having a particularly large degree of deformation are lifted by the sheet, and the sheet is sent to the sheet discharging roller 11. The pressing force may be weakened. However, the other independent spur 13 presses the sheet against the discharge roller 11 with a sufficient force without being affected by the lifted independent spur 13. Therefore, the printed paper can be more reliably fed and urged by the paper discharge roller 11.

As a result, even if the printed paper has a strong stiffness, the printed surface can be prevented from being stained and can be discharged more smoothly.

[0034]

According to the first aspect of the present invention, there is provided a paper receiving portion provided downstream of the paper discharge roller so as to be capable of storing printed paper in a state inclined with respect to the horizontal direction, the paper discharge roller and the paper. Paper bending means disposed between the paper receiving section and the paper discharge section and configured to bend the printed paper section sent from the paper discharge roller in a direction orthogonal to the paper discharge direction; A paper discharge arm that can press the rear end to convey the paper to the paper receiving section is provided, so that the printed paper sent from the paper discharge rollers is held down by the paper discharge arm The paper can be discharged to the receiving section. Therefore, the printed paper portion does not hang down due to its own weight, and is discharged without sliding on the printing surface of the previously printed paper already stored in the paper receiving portion. Further, since the paper receiving section accommodates the printed paper in a state inclined with respect to the horizontal direction, the projected area of the accommodated paper on the horizontal plane is reduced, and the installation space is saved. As described above, the printed paper can be smoothly discharged while minimizing the size and preventing the printed surface from being stained.

According to the second aspect of the present invention, in addition to the above, a plurality of pressing rollers are disposed at a predetermined distance from each other along the axis of the paper discharge roller and are independently pressed against the paper discharge roller. Therefore, even if the printed paper is strong, such as thick paper or an envelope, the printed surface can be prevented from being stained and can be discharged more smoothly.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of an ink jet printer to which a first embodiment of the present invention is applied.

FIG. 2 is a view for explaining inclined portions provided at both ends of a paper guide according to the first embodiment.

FIG. 3 is a perspective view for explaining an arrangement state of each independent spur of the second embodiment.

FIG. 4 is a cross-sectional view showing a positional relationship between each spur and a discharge roller according to a second embodiment.

FIG. 5 is a side sectional view for explaining an arrangement structure of each independent spur according to the second embodiment.

FIG. 6 is a bottom view for explaining an arrangement structure of each independent spur according to the second embodiment.

FIG. 7 is a perspective view showing an ink jet printer to which an embodiment of the present invention is applied.

FIG. 8 is a diagram for explaining a sheet discharging device applied to a conventional inkjet printer.

FIG. 9 is a diagram for explaining another example of a sheet discharging device applied to a conventional printer.

FIG. 10 is a diagram for explaining a sheet discharging operation of the sheet discharging device shown in FIG. 9;

[Explanation of symbols]

 2 Inkjet Head (Print Head) 10, 10 'Paper Ejection Device 11 Discharge Roller 12 Spur (Pressing Roller) 13 Independent Spur (Pressing Roll Forming Part) 15 Paper Receiving Unit 21 Discharge Arm

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-226379 (JP, A) Japanese Utility Model Showa 57-203045 (JP, U) Japanese Utility Model Showa 64-43061 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) B41J 13/00 B65H 29/00-29/70

Claims (2)

(57) [Claims] 1. A discharge roller capable of feeding and energizing a sheet printed by a print head in a discharge direction, a pressing roller pressed against the discharge roller, and horizontally moving a printed sheet downstream of the discharge roller. The paper receiving section is provided so that it can be accommodated in a state inclined with respect to the direction, and the printed paper section that is provided between the paper discharge roller and the paper receiving section and sent out from the paper discharge roller is orthogonal to the paper discharge direction. Paper bending means for bending in the direction in which the paper is printed, and a paper discharge arm capable of conveying the paper to the paper receiving portion by pressing the rear end after the rear end of the printed paper reaches the paper discharge roller. Characteristic paper ejection device for inkjet printers. 2. The pressure roller according to claim 1, wherein the pressure roller comprises a plurality of pressure roller forming portions which are arranged at a predetermined distance from each other along the axis of the paper discharge roller and are independently pressed against the paper discharge roller. paper discharge device of the ink jet flop <br/> printer of claim 1, wherein.