JP3109975B2 - Ink jet recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION In an ink jet recording apparatus, there is provided an ink jet recording apparatus having a mechanism for accommodating a sheet after recording in a paper 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 in a paper discharge stacker.

There is a type in which a discharge roller is a roller with a protrusion, and the sheet is securely stored in a discharge stacker when a rear end of the sheet enters a step portion of a protrusion of a rubber roller. FIG. 8 is a perspective view of a discharge roller with a protrusion, and FIG.
Is a projection for holding the trailing edge of the sheet.

However, in the discharge roller with projections, the undulation of the paper formed by the stepped portion of the rubber roller is transmitted to the printing portion, and adversely affects the printing such as displacement of the ruled line.

In view of this, there is a method in which the discharge roller is not a roller with a projection, but is provided with a spur at a position where the discharge roller enters the discharge stacker from the paper path surface, thereby reliably discharging the paper without adversely affecting printing. .

[0006]

However, in the above-mentioned prior art, a spur is provided at a position where the spur enters the sheet discharge stacker side with respect to the paper path surface. May cause scratches.

[0007]

In order to solve such a problem, the present invention provides a method in which the number of teeth of a spur provided at a position on the paper discharge stacker side with respect to the paper path surface is provided on the paper path surface. Less than the spurs that are

[0008]

According to the present invention, the number of teeth of the spur and the depth of the notch portion provided at a position which enters the sheet discharge stacker side of the paper path surface are made smaller than the spur provided on the paper path surface. By reducing the size of the sheet, it is possible to reliably discharge the sheet without damaging the front end of the sheet.

[0009]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention.
2 and 3, reference numeral 1 denotes a sheet feed roller provided in an auto sheet feeder 2 capable of storing a plurality of sheets, and a sheet feed roller for sending out the sheets in the auto sheet feeder 2. A paper pan 15 for guiding the paper sent out from inside the paper feed roller 4 along the paper feed roller 4 is provided with a paper feed roller 1 so that the leading end of the paper sent from the inside of the auto sheet feeder 2 is applied to the paper pan. A registration roller 5 for taking out is provided in the vicinity of the outlet of the paper pan 3 so as to be pressed against the paper feed roller 4, and a needle roller for guiding the paper sent out by the paper feed roller 4 to a recording position, and 6 is a paper feed roller 8A is a first spur provided corresponding to the gap roller 6 and a gap roller for feeding the sheet sent out by 4 to the discharge roller 7. A.

The paper is sandwiched between the paper feed roller 4 and the needle roller 5, and the gap roller 6 and the first beater 8A, thereby ejecting ink toward the paper at the recording position to perform recording. It is held at a position facing the arrangement surface and keeping a certain distance.
The ink cartridge 9 is mounted on the carriage 13 and performs the above-described recording during scanning in a direction perpendicular to the sheet conveyance direction.

Reference numeral 10 denotes an ink cartridge 9 for guiding a sheet from the delivery roller 4 to the gap roller 6 and for preventing recorded paper from being greatly wavy due to the influence of ink.
Is a platen provided at a position opposed to the nozzle arrangement surface of FIG. Reference numeral 11 denotes a discharge stacker for storing the recorded paper discharged via the discharge roller 7 and the corresponding second spur 8B and third spur 8C, and reference numeral 12 denotes the paper stored in the discharge stacker 11. The separator is supported above the discharge stacker 11. Here, the third spur 8C enters the discharge stacker 11 side of the paper path surface in order to reliably store the rear end of the recorded paper in the discharge stacker 11.

When printing on continuous paper, the registration roller 1 is used.
5 is released, and is discharged onto the separator 12 via 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 main body of the recording apparatus 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. 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 urging means such as a spring (not shown), but the number of teeth 30A and 30B formed in a gear shape is determined. , The teeth 30A and 30B come into contact with the sheet at the same time,
The pressure applied to each tooth is small, and it is possible to prevent the paper from forming traces of teeth.

The third spur 8C is pressed against the discharge roller 7 by a biasing means such as a spring (not shown). In order to securely store the trailing end of the recorded paper in the discharge stacker 11, The leading edge of the recorded paper that has entered the paper discharge stacker 11 side of the paper path surface is the third spur 8
It rushes into C. Therefore, if the third spur 8C has the same shape as the first spur 8A and the second spur 8B, the leading end of the sheet enters the notch between the teeth of the third spur 8C, and the cut is formed. When coming out of the notch, tooth 3
Since the distance between 0C and the teeth 30C is narrow, the leading end of the sheet 19 is damaged by the edge of the notch (see FIG. 4). FIG.
Is an enlarged view of a state in which the leading end of the paper 19 has hit the spur 8C. Therefore, by widening the gap between the teeth, that is, by reducing the number of teeth, compared to the first spur 8A and the second spur 8B, the leading end of the paper smoothly enters the notch of the third spur 8C, and the notch is formed. It is possible to get out of the sheet, so that the edge of the notch does not damage the leading edge of the sheet (see FIG. 5). FIG. 5 shows the spur 8
FIG. 4 is an enlarged view showing that the leading end of a sheet 19 smoothly comes out of C.

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

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

2 and 3 and the first spur 8
A, the shape of the second spur 8B is the same as that of the first embodiment described above, and the description is 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 3 C of 3rd spurs.

By making the outer diameter of the third spur 8C larger than that of the first spur 8A and the second spur 8B,
Even if the number of teeth of C is equal to that of the first spur 8A and the second spur 8B, the gap between the teeth is large, so that the leading end of the paper smoothly enters the notch of the third spur 8C. ,
It is possible to get out of the notch, and the same effect as in the first embodiment can be obtained.

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

In the 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 angle at which the leading end of the paper enters the third spur 8C. The tip may be scratched or jammed.

Therefore, the driving of the third spur 8C is changed to the second spur 8C.
B from the second spur cleaner 18B corresponding to the third spur 8C when the leading edge of the sheet enters the third spur 8C.
C can always be kept rotating.

Therefore, the paper can be more reliably discharged without damaging the leading end of the paper, and the cost can be reduced because the second spur 8B and the third spur 8C share one spur cleaner.

In the ink jet head used in each of the above embodiments, a heating element is provided in a nozzle for ejecting ink, and bubbles are formed in the ink by the thermal energy generated by the heating element, and the bubbles expand. Thus, the ink droplet is ejected from the nozzle.

[0027]

As described above, according to the present invention, a recorded sheet can be reliably discharged without damaging the leading end of the sheet by a spur that has entered the discharge stacker side of the paper path. It can be stored in a stacker with a simple configuration.

[Brief description of the drawings]

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

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

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

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper feed roller 2 auto sheet feeder 3 paper pan 4 paper feed roller 5 needle roller 6 gap roller 7 paper discharge roller 8A first spur 8B second spur 8C third spur 9 ink cartridge 10 platen 11 stacker 12 separator 13 carriage 14 suction Recovery device 15 Registration roller 16 Tractor 17 Protruding portion 18A First spur cleaner 18B Second spur cleaner 18C Third spur cleaner 19 Paper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-142247 (JP, A) JP-A-6-64810 (JP, A) JP-A-6-115195 (JP, A) JP-A-6-115195 127785 (JP, A) JP-A-1-226379 (JP, A) JP-A-3-238262 (JP, A) JP-A-7-251997 (JP, A) JP-A-7-178988 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) B41J 13/00-13/32 B65H 29/20

Claims (8)

(57) [Claims] 1. An image forming apparatus comprising: at least one discharge roller provided downstream of a printing position; and at least one driven roller disposed to face the discharge roller and a sheet passing surface, and to rotate in contact with the discharge roller. An ink jet recording apparatus comprising: a second driven roller provided downstream of the first driven roller and having an outer diameter entering a sheet discharging roller side with respect to the sheet passing surface; The ink jet recording apparatus according to claim 2, wherein the second driven roller has an outer diameter in a tooth shape, and the number of teeth of the second driven roller is smaller than the number of teeth of the first driven roller. 2. An image forming apparatus comprising: at least one discharge roller provided downstream of a printing position; and at least one driven roller disposed opposite to the discharge roller and a sheet passing surface and rotating while contacting the discharge roller. An ink jet recording apparatus comprising: a second driven roller provided downstream of the first driven roller and having an outer diameter entering a sheet discharging roller side with respect to the sheet passing surface; An ink jet recording apparatus according to claim 2, wherein said second driven roller has a tooth-shaped outer diameter, and an outer diameter of said second driven roller is larger than an outer diameter of said first driven roller. 3. At least one discharge roller provided downstream of a printing position and at least one driven roller which is disposed to face the discharge roller and a sheet passing surface and rotates in contact with the discharge roller. An ink jet recording apparatus comprising: a second driven roller provided downstream of the first driven roller and having an outer diameter entering a sheet discharging roller side with respect to the sheet passing surface; The second driven roller has a tooth-shaped outer diameter, 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. An ink jet recording apparatus, wherein the outer diameter of the second driven roller is larger than the outer diameter. 4. The cleaning device according to claim 1, wherein 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. 4. The ink jet recording apparatus according to claim 1, wherein the ink jet recording apparatus is a recording apparatus. 5. A discharge roller provided downstream of a printing position, a driven roller disposed to face the discharge roller and a sheet passing surface, and rotated in contact with the discharge roller; A second discharge roller provided downstream of the roller and a second discharge roller that is disposed to face the second discharge roller and the sheet passing surface, and rotates while abutting on the second discharge roller.
A driven roller provided downstream of the second driven roller, and a third driven roller having an outer diameter entering the sheet discharge roller side with respect to the paper passing surface. The first, second, and third driven rollers each have a tooth-shaped outer diameter, and the number of teeth of the third driven roller is smaller than the number of teeth of the first and second driven rollers. An ink jet recording apparatus characterized in that the number is smaller. 6. A discharge roller provided downstream of a printing position, a driven roller disposed to face the discharge roller and a sheet passing surface, and rotated in contact with the discharge roller; A second discharge roller provided downstream of the roller, a second driven roller that is disposed to face the second discharge roller and the sheet passing surface, and rotates in contact with the second discharge roller; An ink jet recording apparatus comprising: a third driven roller provided downstream of the second driven roller and having an outer diameter entering the roller side with respect to the paper passing surface; The third driven roller has a tooth-shaped outer diameter, and the outer diameter of the third driven roller is larger than the outer diameter of the first and second driven rollers. Inkjet recording apparatus. 7. A discharge roller provided downstream of a printing position, a driven roller disposed opposite to the discharge roller and a paper passing surface, and rotated in contact with the discharge roller; A second discharge roller provided downstream of the roller, a second driven roller that is disposed to face the second discharge roller and the sheet passing surface, and rotates in contact with the second discharge roller; An ink jet recording apparatus comprising: a third driven roller provided downstream of the second driven roller and having an outer diameter entering a sheet discharging roller side with respect to the sheet passing surface; The second and third driven rollers have an outer diameter of 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, wherein the outer diameter of the third driven roller is larger than the diameter. 8. The cleaning apparatus according to claim 1, wherein the third driven roller rotates in contact with a cleaning roller that rotates in contact with the second driven roller to remove ink transferred to the second driven roller. The inkjet recording apparatus according to claim 5, 6, or 7, wherein: