JPH05330175A - Printer - Google Patents

Abstract

PURPOSE:To smoothly discharge printed paper to a specified place without damaging or contaminating the printed paper over a long period of time. CONSTITUTION:The peripheral surface 12 coming into contact with the printed surface of paper of a rotary body 11 is formed so as to be reduced in its lateral dimension and to continuously come into contact with the surface of paper and an ink removing means 21 coming into contact with the peripheral surface 12 to remove the ink bonded to the peripheral surface 12 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing device such as an ink jet printer.

[0002]

2. Description of the Related Art For example, in an ink jet printer that prints by an ink jet head that ejects ink droplets, a spur having thin teeth is used as a rotating body that presses the paper against a paper ejection roller for ejecting the paper from the printing section. There is. This is because, in the above printer, the paper that does not completely dry the ink may reach the paper ejection roller. Therefore, if the rotating body is an ordinary cylindrical roller, the ink will be printed on the peripheral surface of the roller from the printing surface of the paper. Is transferred, and is retransferred to the paper after one rotation of the roller, and the paper becomes dirty.

The conventional construction of such an ink jet printer is shown in FIGS. In FIG. 3, reference numeral 2 is an inkjet head. The inkjet head 2 is configured to perform printing by ejecting ink droplets based on print data onto a sheet that has been moved to a sheet orthogonal to the paper surface in the drawing by a carrier (not shown) and fed to the printing unit C.

Reference numeral 5 denotes a paper feeding device, which is configured to be able to feed a manually fed sheet to the printing section C in the direction of arrow A and automatically feed a cassette sheet in the direction of arrow B. More specifically, the paper feeding device 5 is configured to feed the manual paper sandwiched between the feed roller 6 and the leaf plate 8 to the printing section C by rotating the roller 6 in the arrow direction. ing. On the other hand, the cassette paper is fed from the paper feed tray 7 one by one to the feed roller 6 by an automatic paper feed mechanism (not shown) and fed to the printing section C by the cooperation of the roller 6 and the leaf plate 8.

Reference numeral 10A is a paper discharge device, which is configured to discharge the paper from the printing section C to the paper receiving section 19. More specifically, as shown in FIGS. 3 and 4, the sheet ejection device 10A includes a sheet ejection roller 1 capable of nipping and conveying a sheet.
5 and the rotating body (11A). Here, the rotating body comes into contact with the printing surface of the paper discharged from the printing unit C and presses the paper against the paper discharge roller 15. This rotating body is generally formed by a spur 11A that minimizes the contact area with the paper so that the transfer of ink from the printing surface of the paper is minimized. Spur 11A
As shown in FIGS. 5 (A) and 5 (B), the outer peripheral surface has a sharp sawtooth shape with a sharp tip (note that FIG.
(A) is a side view and (B) is a half sectional view. ). Also,
In FIG. 3, 9 is a paper guide. Further, in FIG. 4, 15a is a support shaft of the paper discharge roller 15, and 16 and 17 are idle gears for rotating the support shaft 15a.

[0006]

By the way, in the above ink jet printer, since the paper is pressed against the paper discharge roller 15 by the spur 11A when the paper is discharged, the spur 11A is used.
The print surface of the paper that comes into contact with the product may be damaged by dents or holes. When such a situation occurs, the ink penetrates into the recessed portion or the like and the print quality deteriorates.

Further, even if the spur 11A is used as the rotating member, the contact area with the paper cannot be made zero and the ink transfer cannot be eliminated, and the dirt on the paper cannot be wiped out. Such inconvenience is
This is an issue that cannot be overlooked in the present day when higher quality printing is required.

In view of the above circumstances, an object of the present invention is to provide a printing apparatus capable of smoothly ejecting a printed sheet to a predetermined place without damaging or soiling it for a long period of time.

[0009]

According to another aspect of the present invention, there is provided a printing apparatus including a rotating body that comes into contact with a printing surface of a sheet discharged from a printing unit and presses the sheet against a discharge roller. The peripheral surface of the body that contacts the paper printing surface is formed to have a narrow width dimension and continuously contacts the paper printing surface, and the ink that adheres to the peripheral surface of the rotating body contacts the peripheral surface. It is characterized in that an ink removing means for removing is provided.

[0010]

According to the present invention having the above-described structure, the sheet printed by the printing unit is pressed against the sheet discharge roller by the rotating member, is urged by the roller and is discharged to a predetermined position.

Since the width of the peripheral surface of the rotating body which is in contact with the printing surface of the paper is narrow, ink transfer from the printing surface of the paper is small. Further, the ink transferred to the peripheral surface of the rotating body is removed by the ink removing means. Therefore,
The peripheral surface of the rotator comes into contact with the printing surface of the paper in a state where the ink is completely removed, so that the dirt of the paper can be wiped out.

Further, since the peripheral surface of the rotator is formed so as to continuously contact the paper printing surface, a hole or a dent may be formed in the paper printing surface portion which is in contact with the peripheral surface. There is no such thing.

Further, since the peripheral surface of the rotator is formed so as to have a narrow width and continuously contact with the printing surface of the paper, excessive contact resistance with the ink removing means does not occur in normal use. Therefore, when the paper is discharged, the rotary body can be rotated and brought into contact with the paper printing surface, and it is possible to prevent a part of the peripheral surface of the rotary body from being abnormally worn due to sliding contact with the paper. In addition, the peripheral surface of the rotator does not cause the ink removing means to wear out early, and the ink can be removed smoothly over a long period of time.

Therefore, the printed paper can be smoothly discharged to a predetermined place for a long period of time without damaging or soiling it.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The printing apparatus according to the present embodiment is of an inkjet type, and as shown in FIG. 1, the inkjet head 2, the printing unit C, the paper feeding device 5, the paper guide 9, the paper ejection device 10 (the rotator 11, the paper ejection device). The roller 15) and the ink removing means (21) are included. The same parts as those in FIGS. 3 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

Here, the peripheral surface 12 of the rotating body 11 which comes into contact with the paper printing surface is formed to have a narrow width dimension so as to continuously contact the paper printing surface. In this embodiment, the peripheral surface 12 of the rotating body 11 is, as shown in FIGS. 2 (A) and 2 (B),
It has a pointed central part like an abacus ball (note that FIG. 2A is a side view and FIG. 2B is a half sectional view). Further, as shown in FIG. 1, the rotating body 11 is rotatably supported by the holder 13 and is pressed against the paper discharge roller 15 by the leaf spring 14. The rotating body 11 is made of a water-repellent material (Teflon-based material in this embodiment) to which ink is hard to adhere.

A gear 16 is attached to the end of the roller shaft 15a of the paper discharge roller 15. A drive gear 18 is attached to the end of the roller shaft 6a of the feed roller 6, and the gear 18 is configured to rotate in the arrow direction by a drive gear mechanism (not shown). The two gears 16 and 18 are connected via an idle gear 17. Therefore, when the feed roller 6 is rotated in the direction of the arrow, the paper discharge roller 15 also moves to the gears 18, 17, 1
6 is rotated in the direction of the arrow.

The ink removing means is means for removing the ink attached to the peripheral surface 12 of the rotating body 11. In this embodiment, the ink removing means is composed of the blotter roller 21. The blotter roller 21 is made of an ink absorbing material, and its peripheral surface 22 is the peripheral surface 1 of the rotating body 11.
It is rotatably supported by the holder 13 so as to come into contact with 2.

Next, the operation will be described. The sheet printed by the printing unit C and sent out is pressed against the sheet discharge roller 15 by the rotating body 11, is urged to be sent by the roller 15, and is discharged to the sheet receiving unit 19.

Here, since the peripheral surface 12 of the rotating body 11 that comes into contact with the paper printing surface has a narrow width dimension, ink transfer from the paper printing surface is small. The ink transferred onto the peripheral surface 12 of the rotating body 11 is removed by the blotter roller 21. Therefore, the peripheral surface 12 of the rotator 11 comes into contact with the printing surface of the paper in a state where the ink is completely removed, and the paper can be cleaned.

Further, since the peripheral surface 12 of the rotating body 11 is formed so as to continuously contact with the paper printing surface, the paper printing surface portion which is in contact with the peripheral surface 12 has a hole or a dent. There is nothing that can be done.

Further, since the peripheral surface 12 of the rotating body 11 is formed so as to have a narrow width and continuously contact with the printing surface of the paper, in normal use, excessive contact resistance with the blotter roller 21 is not generated. Absent. Therefore, when the paper is discharged, the rotating body 1
1 can be rotated and brought into contact with the printing surface of the paper,
It is possible to prevent abnormal wear of a part of the peripheral surface 12 of the rotating body 11 due to sliding contact with a sheet. Further, the blotter roller 21 is not abraded early by the peripheral surface 12 of the rotating body 11, and the ink can be smoothly removed over a long period of time.

Therefore, the printed paper can be smoothly discharged to the paper receiving portion 19 for a long period of time without being damaged or soiled.

Further, since the rotator 11 is made of a water repellent material, the ink is less likely to adhere to it, and the retransfer of the ink can be prevented more effectively to prevent the paper stain.

The rotating body 11 is composed of a blotter roller 21.
Since it is pushed downward in FIG. 1 (toward the paper ejection roller 15), even if the elastic force of the leaf spring 14 is weakened, it is pressed against the paper ejection roller 15 with a predetermined pressure. Therefore, the sheet can be smoothly discharged to the sheet receiving portion 19 by the cooperation of the rotating body 11 and the sheet discharging roller 15.

Thus, according to this embodiment, the rotating body 1
The peripheral surface 12 that contacts the paper printing surface of No. 1 is formed so as to have a narrow width dimension and continuously contacts the paper printing surface, and the peripheral surface 12 that contacts the peripheral surface 12 of the rotating body 11 is formed.
Since the blotter roller 21 for removing the ink adhered to is provided, the printed paper can be smoothly discharged to the paper receiving portion 19 for a long period of time without damaging or soiling it.

In the above embodiment, the rotating body 11 is formed in the shape of an abacus ball, but it is not limited to this as long as the peripheral surface 12 is formed so as to have a narrow width and can continuously contact the printing surface of the paper. ..

Further, although the present invention is applied to the injector type printing apparatus, it can be applied to other printing apparatuses.

Further, the ink removing means is a blotter roller 2
However, the invention is not limited to this as long as it can contact the peripheral surface 12 of the rotating body 11 and remove the ink adhering to the peripheral surface 12. For example, the ink removing means may be composed of a plate-shaped ink absorber.

[0030]

According to the present invention, the peripheral surface of the rotator, which comes into contact with the paper printing surface, is formed so as to have a narrow width dimension and continuously contact with the paper printing surface, and the peripheral surface of the rotator is provided. Since the ink removing means is provided to remove the ink adhering to the peripheral surface by contacting with, it is possible to smoothly discharge the printed paper to a predetermined place without damaging or soiling the printed paper for a long period of time. You can

[Brief description of drawings]

FIG. 1 is a diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing a rotating body according to an embodiment.

FIG. 3 is a diagram for explaining a schematic configuration of a conventional inkjet printer.

FIG. 4 is a perspective view for explaining a positional relationship between a discharge roller and a spur of a conventional inkjet printer.

FIG. 5 is a diagram for explaining a conventional spur.

[Explanation of symbols]

 11 rotating body 12 peripheral surface 21 blotter roller (ink removing means)

Claims (1)

[Claims] 1. A printing apparatus comprising a rotating body that comes into contact with a printing surface of a sheet discharged from a printing unit and presses the sheet against a sheet discharging roller, wherein a peripheral surface of the rotating body that contacts the printing surface of the sheet is It is characterized in that it has a narrow width dimension and is formed so as to be in continuous contact with the printing surface of the paper, and that it is provided with an ink removing means for contacting with the peripheral surface of the rotating body to remove ink adhering to the peripheral surface. Printing device.