JPH08276627A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE: To eliminate the danger of damaging the leading edge of paper and thereby ensure reliable paper discharge by providing first and second driven rollers that have teeth external shapes by relatively reducing the number of teeth of the second driven roller below the number of teeth of the first driven roller. CONSTITUTION: A second spur wheel 8B, provided as a first driven roller, is pressed against a paper discharge roller 7 by urging means such as a spring. The second spur wheel 8B has an increased number of teeth 30B formed in a tooth shape, so that a plurality of teeth 30B simultaneously contact paper and thereby avoid impressing teeth mark on paper. A third spur wheel 8C, provided as a second driven roller, is pressed against the discharge roller 7 by urging means such as a spring. The third spur wheel 8C is disposed in a position shifted off the paper path toward a discharged paper stacker so that the leading edge of a recorded paper sheet 19 strikes the third spur wheel 8C, in order to ensure that the tailing end of a recorded paper 19 will be placed in the paper stacker. The third spur wheel 8C has fewer teeth than the second wheel 8B, so that the third spur wheel 8C smoothly discharges the recorded paper sheet 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an ink jet recording apparatus having a mechanism for storing a sheet after recording is completed in a sheet discharge stacker.

[0002]

2. Description of the Related Art In an ink jet recording apparatus, the following method is known as a method for storing a sheet after recording is completed in a sheet discharge stacker.

There is a type in which the discharge roller is a roller with a projection, and the rear end of the sheet enters the stepped portion of the projection of the rubber roller to reliably store the sheet in the discharge stacker. FIG. 8 is a perspective view of the discharge roller with protrusions.
Is a protrusion that holds the trailing edge of the paper.

However, in the discharge roller with protrusions, the corrugation of the paper formed by the stepped portion of the rubber roller is transmitted to the printing portion, and there is a bad influence on the printing such as ruled line shift.

Therefore, there is a method in which the discharge roller is not a roller with a projection, but a spur is provided at a position where it enters the discharge stacker from the paper path surface so that the discharge can be reliably performed without adversely affecting the printing. .

[0006]

However, in the above-mentioned conventional example, since the spur is provided at a position that is closer to the paper ejection stacker side than the paper path surface, the leading end of the sheet rushes into the cutout portion of the spur and is retracted. May cause scratches when doing.

[0007]

In order to solve such a problem, the present invention provides the number of spur teeth provided at a position closer to the paper ejection stacker side than the paper path surface on the paper path surface. It is less than the spur.

[0008]

According to the present invention, the number of teeth of the spurs and the depth of the notch portion provided at the position closer to the paper ejection stacker side than the paper path surface are set to be smaller than those of the spurs provided on the paper path surface. By making it smaller, it is possible to reliably discharge the sheet without damaging the leading edge of the sheet.

[0009]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described in detail and specifically with reference to the drawings.

1 to 5 show a first embodiment of the present invention.
In FIGS. 2 and 3, reference numeral 1 is a sheet feeding roller that is provided in an auto sheet feeder 2 that can store a plurality of sheets, and that feeds the sheets in the auto sheet feeder 2; A paper pan for guiding the paper sent out from inside the paper feed roller 4 along the paper feed roller 4, and 15 for registering the leading end of the paper sent out from the inside of the auto sheet feeder 2 by the paper feed roller 1 to the register. A registration roller 5 for taking out is provided near the exit of the paper pan 3 so as to be in pressure contact with the paper feeding roller 4, and a needle roller 6 for guiding the paper fed by the paper feeding roller 4 to a recording position, and 6 a paper feeding roller. 4 is a gap roller for feeding the sheet sent out by 4 to the discharge roller 7, and 8A is a first spur provided corresponding to the gap roller 6. A.

The paper is sandwiched by the paper feed roller 4 and the needle roller 5, and the gap roller 6 and the first beater 8A, respectively, so that at the recording position, the ink is ejected toward the paper and the nozzles of the ink cartridge 9 for recording are recorded. It is held at a position facing the placement surface and maintaining a certain distance.
The ink cartridge 9 is mounted on the carriage 13, and the above recording is performed during scanning in a direction orthogonal to the paper conveyance direction.

The numeral 10 denotes an ink cartridge 9 for guiding the paper from the feed roller 4 to the gap roller 6 and for preventing the recorded paper from wavy due to the influence of the ink.
It is a platen provided at a position facing the nozzle arrangement surface of. Reference numeral 11 denotes a discharge stacker for storing the recorded sheets discharged via the discharge roller 7 and the corresponding second spur 8B and third spur 8C. Reference numeral 12 denotes the paper stored in the discharge stacker 11. It is a separator supported above the discharge stacker 11. Here, the third spur 8C is inserted into the paper ejection stacker 11 side of the paper path surface in order to surely store the rear end of the recorded paper in the paper ejection stacker 11.

When printing on continuous paper, the registration roller 1
5 is discharged and is discharged onto the separator 12 through the tractor 16, the paper feed roller 4, and the paper discharge roller 7, and the leading end of the continuous paper is discharged to the rear of the recording apparatus main body while climbing the separator 12.

Next, the first spur 8A and the second spur 8B
The shape of the third spur 8C will be described in detail with reference to FIGS. 1, 4 and 5. FIG. 1 is a detailed configuration diagram of the first spur 8A, the second spur 8B, and the third spur 8C.

The first spur 8A and the second spur 8B are respectively pressed against the gap roller 6 and the discharge roller 7 by a biasing means such as a spring (not shown), but the number of teeth 30A, 30B formed in a gear shape. By increasing the number of teeth, a plurality of teeth 30A and 30B come into contact with the paper at the same time.
The pressure applied to each tooth is small, and it is possible to prevent tooth marks from being left on the paper.

The third spur 8C is pressed against the discharge roller 7 by a biasing means such as a spring (not shown), but in order to surely store the trailing end of the recorded sheets in the sheet discharge stacker 11, The leading edge of the recorded paper, which has entered the paper output stacker 11 side of the paper path surface, is the third spur 8
It rushes in as it hits C. Therefore, if the third spur 8C has a shape similar to that of the first spur 8A and the second spur 8B, the leading edge of the paper sheet rushes into the notch portion between the teeth of the third spur 8C and cuts. 3 teeth when leaving the notch
Since the distance between 0C and the tooth 30C is narrow, the leading edge of the sheet 19 is damaged by the edge of the cutout portion (see FIG. 4). FIG.
[FIG. 7] is an enlarged view of a state in which the front end of the paper 19 hits the spur 8C. Therefore, by making the distance between the teeth wider than that of the first spur 8A and the second spur 8B, that is, by reducing the number of teeth, the leading edge of the sheet smoothly enters the notch of the third spur 8C, and the notch is formed. The edge of the notch will not scratch the leading edge of the sheet (see FIG. 5). FIG. 5 shows a spur 8
FIG. 7 is an enlarged view showing that the front end of the paper sheet 19 smoothly comes out from C.

The first spur 8A, the second spur 8B and the third spur 8C are respectively provided with spur cleaners 18A, 18B and 18C so as to overlap with the tooth portions.

(Embodiment 2) FIGS. 2, 3, and 6 show a second embodiment of the present invention.

2 and 3, and the first spur 8
Since the shapes of A and the second spur 8B are the same as those of the first embodiment described above, the description thereof will be omitted.

The shape of the third spur 8C will be described in detail with reference to FIG. FIG. 6 shows the first spur 8A and the second spur 8
It is a detailed block diagram of B and the 3rd spur 8C.

By making the outer diameter of the third spur 8C larger than that of the first spur 8A and the second spur 8B, the third spur 8C is formed.
Even if the number of teeth of C is the same as that of the first spur 8A and the second spur 8B, the distance between the teeth becomes large, so the leading edge of the paper smoothly enters the notch of the third spur 8C. ,
It is possible to get out of the cutout portion, and it is possible to obtain the same effect as that of the first embodiment.

(Embodiment 3) FIGS. 2, 3, and 7 show a third embodiment of the present invention.

In the above-described first and second embodiments, when thin and weak paper such as tracing paper is used, the third spur 8C does not rotate depending on the entry angle of the tip of the paper into the third spur 8C, and the paper is There is a risk of scratching the tip or causing a jam.

Therefore, the drive of the third spur 8C is changed to the second spur 8C.
By obtaining from the second spur cleaner 18B corresponding to B, when the leading edge of the paper enters the third spur 8C, the third spur 8
C can always be kept in a rotating state.

Therefore, the paper can be discharged more reliably without damaging the leading end of the paper, and one spur cleaner is shared by the second spur 8B and the third spur 8C, which leads to cost reduction.

In the ink jet head used in each of the above-described embodiments, the heating element is provided in the nozzle for ejecting ink, and the heat energy generated by the heating element forms a bubble in the ink, and the bubble expands. The ink droplets are ejected from the nozzles.

[0027]

As described above, according to the present invention, a recorded sheet can be reliably discharged without damaging the leading edge of the sheet by the spurs entering the discharge stacker side of the paper path. It can be stored in the stacker with a simple structure.

[Brief description of drawings]

FIG. 1 is a detailed view of the arrangement of spurs and the shape of spurs in the first embodiment.

FIG. 2 is a plan view showing a first embodiment, a second embodiment and a third embodiment of the present invention.

FIG. 3 is a sectional view showing a first embodiment, a second embodiment and a third embodiment.

FIG. 4 is a schematic diagram showing the behavior of the leading edge of the sheet when the third spur has the same shape as the second spur in the first embodiment.

FIG. 5 is a schematic diagram showing the behavior of the leading edge of the sheet when the third spur has a different shape from the second spur in the first embodiment.

FIG. 6 is a detailed view of the arrangement of spurs and the shape of spurs in the second embodiment.

FIG. 7 is a detailed view of the arrangement of spurs and the shape of spurs in the third embodiment.

FIG. 8 is a perspective view of a paper discharge roller with protrusions according to a conventional technique.

[Explanation of symbols]

 1 Paper Feed Roller 2 Auto Sheet Feeder 3 Paper Pan 4 Paper Feed Roller 5 Needle Roller 6 Gap Roller 7 Paper Ejection Roller 8A 1st Spur 8B 2nd Spur 8C 3rd Spur 9 Ink Cartridge 10 Platen 11 Stacker 12 Separator 13 Carriage 14 Suction Recovery device 15 Regiroller 16 Tractor 17 Protruding part 18A First spur cleaner 18B Second spur cleaner 18C Third spur cleaner 19 Paper

Claims (8)

[Claims] 1. At least one discharge roller provided on the downstream side of a printing position, and at least one driven roller which is arranged so as to face the discharge roller and rotates in contact with the discharge roller. An inkjet recording apparatus provided with a second driven roller that is provided on the downstream side of the first driven roller and has an outer diameter that is located on the discharge roller side with respect to the sheet passing surface. An ink jet recording apparatus, wherein the second driven roller has a toothed outer diameter, and the number of teeth of the second driven roller is smaller than the number of teeth of the first driven roller. 2. At least one discharge roller provided on the downstream side of the printing position, and at least one driven roller that is disposed so as to face the discharge surface of the discharge roller and abuts on the discharge roller to rotate. An inkjet recording apparatus provided with a second driven roller that is provided on the downstream side of the first driven roller and has an outer diameter that is located on the discharge roller side with respect to the sheet passing surface. The second driven roller has an outer diameter of a tooth shape, and the outer diameter of the second driven roller is larger than the outer diameter of the first driven roller. 3. At least one discharge roller provided on the downstream side of the printing position, and at least one driven roller which is arranged so as to face the discharge roller and rotates in contact with the discharge roller. An inkjet recording apparatus provided with a second driven roller that is provided on the downstream side of the first driven roller and has an outer diameter that is located on the discharge roller side with respect to the sheet passing surface. The outer diameter of the second driven roller is tooth-shaped, the number of teeth of the second driven roller is smaller than the number of teeth of the first driven roller, and the number of teeth of the first driven roller is smaller than that of the first driven roller. An ink jet recording apparatus, wherein the outer diameter of the second driven roller is larger than the outer diameter. 4. The second driven roller rotates in contact with a cleaning roller that rotates in contact with the first driven roller in order to remove ink transferred to the first driven roller. The ink jet recording apparatus according to claim 1, claim 2, or claim 3, characterized in that. 5. A discharge roller provided on the downstream side of the printing position, a driven roller which is arranged to face the discharge roller and a paper passing surface, and which rotates in contact with the discharge roller and the first discharge. A second discharge roller provided on the downstream side of the roller, a second discharge roller and a second discharge roller which are arranged so as to face the sheet passing surface, and contact the second discharge roller and rotate.
And a third driven roller which is provided on the downstream side of the second driven roller and has an outer diameter that is in the paper discharge roller side with respect to the paper passing surface. The outer diameters of the first, second, and third driven rollers are tooth-shaped, and the number of teeth of the third driven roller is greater than the number of teeth of the first and second driven rollers. Inkjet recording device characterized by a smaller number. 6. A discharge roller provided on the downstream side of a printing position, a driven roller which is arranged to face the discharge roller and a sheet passing surface, and which rotates in contact with the discharge roller, and the first discharge. A second discharge roller provided on the downstream side of the roller, a second driven roller arranged to face the second discharge roller, and abutting against the second discharge roller to rotate. An ink jet recording apparatus provided with a third driven roller which is provided on the downstream side of the second driven roller and has an outer diameter that is located on the roller side with respect to the sheet passing surface. And the outer diameter of the third driven roller is tooth-shaped, and the outer diameter of the third driven roller is larger than the outer diameter of the first and second driven rollers. Inkjet recording device. 7. A discharge roller provided on the downstream side of a printing position, a driven roller arranged to face the discharge roller and a sheet passing surface, and a driven roller rotating in contact with the discharge roller, and the first discharge. A second discharge roller provided on the downstream side of the roller, a second driven roller arranged to face the second discharge roller, and abutting against the second discharge roller to rotate. An ink jet recording apparatus provided with a third driven roller which is provided on the downstream side of the second driven roller and has an outer diameter that is in the paper discharge roller side with respect to the paper passing surface; In the second and third driven rollers, the outer diameter has a tooth shape, and the number of teeth of the third driven roller is smaller than the number of teeth of the first and second driven rollers, In addition, outside of the first and second driven rollers An ink jet recording apparatus characterized in that the outer diameter of the third driven roller is larger than the diameter. 8. The third driven roller rotates in contact with a cleaning roller which rotates in contact with the second driven roller in order to remove ink transferred to the second driven roller. The inkjet recording apparatus according to claim 5, 6, or 7, which is characterized.