JP2003285959A - Recording medium conveying device, and recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording medium conveying device capable of preventing degradation of recording quality by smoothly delivering a recording medium, and a recording device having the recording medium conveying device. <P>SOLUTION: The recording medium conveying device 100 conveys the recording medium on a recording medium conveying surface 122 with a feeding roller 151 and ejects it from the recording medium conveying surface with an ejecting roller 153. The recording medium conveying surface of the conveying device 100 is provided with a suction part 125 for pressing the recording medium onto the ejecting roller by intake. Thus, the recording medium contacts with the ejecting roller only on the opposite surface to a recording surface and is ejected following rotation of only the ejecting roller, so that conventional spur roller is not required. Therefore, even when a cock ring occurs in the recording medium, the recording medium can be smoothly delivered to prevent the degradation of the recording quality. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium conveying device for conveying a recording medium and a recording device provided with this recording medium conveying device.

[0002]

2. Description of the Related Art Conventionally, an ink jet printer, which is one of recording devices, has a structure in which a sheet, which is one of recording media, is fed to a recording section by a sheet conveying device, and is recorded and sent out. There is. Figure 9
FIG. 3A is a diagram in which only a main part of a sheet conveying device in such an ink jet printer is extracted and shown.
In such an ink jet printer, the paper 1 is sandwiched by the paper feed roller 2 and its driven roller 2a and is fed while being recorded by the recording head 3, and the paper 1 is pinched by the paper discharge roller 4 and its spur roller 4a as its driven roller. It is designed to be discharged.

[0003]

In the ink jet printer provided with the above-described conventional paper conveying apparatus, the paper 1
In the case where an image in which a large number of ink droplets are ejected, such as a solid image, is recorded, the paper 1 absorbs a large amount of ink and, as shown in FIG. A so-called cockling, which swells in a wave shape on the 3 side, may occur.

When the sheet 1 is lifted by this cockling, the printing surface of the sheet 1 is pressed against the spur roller 4a as shown by an arrow B in FIG. 9B, and the sheet 1 is printed as shown in FIG. A spur mark by the spur roller 4a is attached to the surface, which is one of the causes for lowering the print quality.

The present invention has been made in view of the above-mentioned various problems, and an object thereof is a recording medium conveying device capable of smoothly carrying out a recording medium and preventing deterioration of recording quality, and a recording medium conveying device. It is an object of the present invention to provide a recording device including a recording medium transport device.

[0006]

To achieve the above object, in a recording medium conveying apparatus according to a first aspect of the present invention, a recording medium is conveyed on a recording medium conveying surface by a feed roller and the recording medium is conveyed by a discharge roller. A recording medium transporting device for discharging from a medium transporting surface, characterized in that an adsorbing portion for pressing the recording medium against the discharge roller by suction is formed on the recording medium transporting surface. As a result, the recording medium comes into contact with the ejection roller only on the side opposite to the recording surface, and is ejected as the ejection roller rotates. Even if cockling occurs in the medium, it is possible to smoothly carry out the recording medium and prevent deterioration of the recording quality.

According to a second aspect of the present invention, in the recording medium conveying device according to the first aspect, the plurality of suction portions and the plurality of discharge rollers are alternately arranged in a direction orthogonal to the conveying direction of the recording medium. It is characterized by being installed.
As a result, the recording medium can be pressed against the discharge roller in the direction orthogonal to the conveying direction,
It is possible to reliably carry out the recording medium.

To achieve the above object, in a recording medium conveying device according to a third aspect of the present invention, a recording medium is conveyed on a recording medium conveying surface by a feed roller and is ejected from the recording medium conveying surface by an ejection roller. In the recording medium transporting device, a blowout portion that presses the recording medium against the discharge roller by exhaust is formed on the discharge roller. As a result, the recording medium is
Only the surface on the side opposite to the recording surface comes into contact with the discharge roller, and is discharged as the discharge roller rotates.
The conventional spur roller is unnecessary, and even if cockling occurs in the recording medium, the recording medium can be smoothly carried out and the deterioration of recording quality can be prevented.

According to a fourth aspect of the invention, in the recording medium conveying apparatus according to any one of the first to third aspects, the discharge roller is formed of a high friction material. As a result, the friction between the recording medium and the discharge roller can be increased, so that the recording medium can be carried out more reliably.

To achieve the above object, a recording apparatus according to a fifth aspect of the present invention is characterized by including the recording medium conveying apparatus according to any one of the first to fourth aspects. As a result, it is possible to provide the recording apparatus that achieves the above-described respective operational effects.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing a recording medium conveying apparatus according to the first embodiment of the present invention. The recording medium conveying device 100 includes a suction unit 110 that sucks and holds the recording medium at the time of recording, and a recording medium conveying unit 150 that conveys the recording medium from the upstream side to the downstream side of the suction unit 110. The suction unit 110 is arranged below the recording head 231 for recording on the recording medium with the recording medium conveying path L interposed therebetween. The upper suction unit 120 and the lower suction force generation unit 130 are formed in a hollow box shape having two upper and lower stages.

The suction section 120 includes a decompression chamber 121 formed therein, a plurality of suction chambers 123 formed in a substantially rectangular shape on a recording medium conveying surface 122 as shown in FIG. 2, and these suction chambers 123. In order to communicate with the decompression chamber 121, it has a plurality of suction holes 124 having a smaller sectional area than the suction chamber 123 extending in the vertical direction.

The suction force generating section 130 is in communication with the decompression chamber 121 of the suction section 120 through a communication hole 131, and has a pump 132 having a centrifugal fan therein. The pump 132 is attached to a predetermined position below the decompression chamber 121 in a state of communicating with the decompression chamber 121 via a communication hole 131, and a centrifugal fan rotates during recording.

As described above, the suction hole is constituted by the suction hole 124 and the suction chamber 123, and the suction hole 124 is formed by a small-diameter through hole, so that the negative pressure can be utilized for the characteristics of the pump 132. The suction chamber 123
Is formed as a substantially rectangular recess having a larger area than the suction hole 124, a large suction force can be generated with respect to the recording medium.

The recording medium conveying means 150 includes a feed roller 151 for feeding the recording medium between the recording head 231 and the suction unit 110, a driven roller 152 pressed against the feed roller 151 from above, and a recording medium. And a discharge roller 153 for discharging the. The discharge roller 153 is made of a high friction material such as rubber or sponge.

Then, as shown in FIG. 3, the discharge roller 1
A plurality of 53 are arranged on a single shaft 153a at a predetermined interval, and a projecting portion 122a of the recording medium carrying surface 122 is formed between the discharge rollers 153. As shown in FIGS. 1 and 3, a suction chamber 123 formed in the above-described substantially rectangular shape and each of the suction chambers 123 are formed in each of the protrusions 122 a of the recording medium transport surface 122.
The suction chamber 1 extending in the vertical direction so as to communicate with 1.
A plurality of suction holes 124 having a cross-sectional area smaller than 23 are formed.

By providing the adsorbing portion 125 including the projecting portion 122a of the recording medium conveying surface 122, the suction chamber 123 and the suction hole 124, the surface of the recording medium opposite to the recording surface is the adsorbing portion 125. Adsorbed and discharged roller 153
The sheet is pressed against and comes into contact with the sheet, and is discharged as the discharge roller 153 rotates. Therefore, even if cockling occurs in the recording medium, the recording medium can be smoothly carried out, and since a conventional spur roller is not necessary, spur marks are not formed and the deterioration of the recording quality can be prevented. it can.

Further, the suction chamber 123 and the discharge roller 153
Are alternately arranged in the direction orthogonal to the conveyance direction of the recording medium, and the discharge roller 153 is made of a high-friction material, so that the recording medium can be firmly pressed against the discharge roller 153 and the recording medium can be firmly pressed. The friction between the discharge roller 153 and the discharge roller 153 can be increased. Therefore, it is possible to reliably carry out the recording medium.

The recording medium conveying apparatus 100 having such a structure
Operates as follows. The feed roller 151 and the like are rotationally driven to feed the recording medium between the recording head 231 and the suction unit 110. On the other hand, the pump 132 is driven to apply the suction force to the suction hole 124 and the suction chamber 123 via the communication hole 131 and the decompression chamber 121. This allows
The recording medium is conveyed while being suction-adsorbed on the recording medium conveying surface 122.

At the same time, the recording head 231 discharges ink particles onto the recording medium while moving above the recording medium in the main scanning direction to perform recording. As a result, cockling may occur on the recording medium after recording, but the recording medium is sucked and adsorbed by the projecting portion 122a of the recording medium conveying surface 122 and pressed against the discharge roller 153. Then, the discharge roller 153 is rotationally driven to discharge the recording medium for which recording has been completed to the outside.

FIG. 4 is a side view showing the recording medium carrying device according to the second embodiment of the present invention in association with the recording medium carrying device according to the first embodiment of FIG. The same numbers are given and their explanations are omitted. The recording medium conveying device 160 is different from the recording medium conveying device 100 of FIG. 1 in that the suction portion 125 is not provided, and the blowing portion 133 communicating with the pump 132 is arranged above the discharge roller 153. Has become.

The discharge roller 153 of this embodiment is also made of a high friction material such as rubber or sponge. Further, the discharge roller 153 corresponds to the recording medium conveying device 10 of FIG.
As in the case of 0, a plurality of rollers may be arranged on the one shaft 153a at predetermined intervals, or may be one roller.

By providing the blowing portion 133 communicating with the pump 132, the exhaust air blown from the pump 132 through the blowing portion 133 is blown to the recording surface of the recording medium, so that it is opposite to the recording surface. The side surface is pressed against the discharge roller 153 and comes into contact with the discharge roller 153, and is discharged as the discharge roller 153 rotates.
Therefore, even if cockling occurs in the recording medium, the recording medium can be smoothly carried out, and since a conventional spur roller is not necessary, spur marks are not formed and the deterioration of the recording quality can be prevented. it can.

Further, the blowing section 133 and the discharge roller 1
Since 53 is arranged all over in the direction orthogonal to the recording medium conveyance direction and the discharge roller 153 is formed of a high-friction material, the recording medium can be firmly pressed against the discharge roller 153, and The friction with the discharge roller 153 can be increased. Therefore, it is possible to reliably carry out the recording medium.

FIG. 5 is a perspective view showing an ink jet printer as a recording apparatus provided with the recording medium conveying apparatus of the present invention, and FIGS. 6 to 8 are plan views, front views and side views showing the main parts thereof. is there. This inkjet printer 20
The printer 0 includes an automatic sheet feeding (ASF) unit 220 obliquely attached to the upper rear part of the printer body 210, a recording unit 230 and a recording medium conveying device 100 built in the printer body 210. As recording media, special paper for the inkjet printer 200, plain paper, OHP
Various materials such as films, tracing papers, and postcards can be used.

The ASF unit 220 is provided with a tray 221 for accommodating the sheet 1, a sheet feeding roller 222 for pulling out the sheet 1 from the tray 221, and supplying the sheet. The recording unit 230 includes a carriage 233 on which the recording head 231 and the ink cartridge 232 are mounted, a DC motor 235 for moving the carriage 233 along a guide shaft 234 arranged in the main scanning direction, and the like. The recording head 231 includes, for example, cyan, magenta, yellow,
Each of the light cyan, light magenta, light yellow, and black colors has a nozzle row including a plurality of nozzles such as 96 nozzles.

The ink jet printer 200 having such a structure operates as follows. When a recording command for the sheets 1 stored in the tray 221 is input by a host computer (not shown) or the like, the sheet feeding roller 22
2 is rotationally driven to pick up and feed the sheets 1 stored in the tray 221 one by one. Further, the feed roller 152 and the like are rotatably driven to move the paper 1 to the recording head 2
It is sent between 31 and the suction unit 110.

On the other hand, the pump 132 is driven to apply a suction force to the suction hole 124 and the suction chamber 123 via the communication hole 131 and the decompression chamber 121. Then, the sheet 1 is conveyed while being suction-adsorbed on the recording medium conveying surface 125. At the same time, the DC motor 235 drives to move the carriage 233 along the guide shaft 234 via the timing belt.

At this time, the recording head 231 ejects the ink supplied from the ink cartridge 232 for each color onto the sheet 1 as minute ink droplets from all or some of the plurality of nozzles according to the recording data. To record. As a result, cockling may occur on the paper 1 after recording, but the paper 1 is not projected on the projection 122 of the recording medium transport surface 122.
It is sucked and adsorbed by a and pressed against the discharge roller 153. Then, the discharge roller 153 is driven to rotate, and the recording-completed sheet 1 is discharged from the sheet discharge port 201 to the outside.

[0031]

As described above, according to the recording medium conveying device and the recording device of the present invention, only the surface of the recording medium opposite to the recording surface contacts the discharge roller, and only the discharge roller. Therefore, the spur roller as in the prior art is unnecessary, and even if cockling occurs in the recording medium, the recording medium can be smoothly carried out and the deterioration of the recording quality can be prevented. it can.

[Brief description of drawings]

FIG. 1 is a side view showing a recording medium carrying device according to a first embodiment of the present invention.

2 is a plan view showing a recording medium carrying surface of the recording medium carrying device of FIG. 1. FIG.

3 is a perspective view showing a suction unit 125 of the recording medium conveyance device of FIG.

FIG. 4 is a side view showing a recording medium carrying device according to a second embodiment of the present invention.

FIG. 5 is a perspective view showing an inkjet printer as a recording apparatus provided with the recording medium conveying apparatus of the present invention.

FIG. 6 is a plan view showing a main part of the ink jet printer of FIG.

FIG. 7 is a front view showing a main part of the ink jet printer of FIG.

FIG. 8 is a side view showing a main part of the ink jet printer of FIG.

FIG. 9 is a diagram in which only a main part of a sheet conveying device in a conventional inkjet printer is extracted and shown.

FIG. 10 is a diagram showing a problem in a conventional inkjet printer.

[Explanation of symbols]

1 sheet 100 recording medium conveying device 110 suction unit 120 suction unit 121 Decompression room 122 Recording Medium Transport Surface 122a protrusion 123 Suction chamber 124 Suction hole 125 Adsorption part 130 Suction force generator 131 communication hole 132 pump 133 Speech balloon 150 recording medium conveying means 151 Feed roller 152 Driven roller 153 Discharge roller 154 spur roller 160 recording medium conveying device 200 inkjet printer 210 Printer body 220 ASF unit 221 tray 222 Paper feed roller 230 Recorder 231 recording head 232 ink cartridge 233 carriage 234 Guide shaft 235 DC motor

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Claims (5)

[Claims] 1. A recording medium conveying device for conveying a recording medium on a recording medium conveying surface by a feed roller and ejecting the recording medium from the recording medium conveying surface by an ejecting roller, wherein the recording medium is ejected by suction. A recording medium transporting device, wherein a suction portion to be pressed against is formed on the recording medium transporting surface. 2. The recording medium transport according to claim 1, wherein the plurality of suction portions and the plurality of discharge rollers are alternately arranged in a direction orthogonal to a transport direction of the recording medium. apparatus. 3. A recording medium conveying device that conveys a recording medium on a recording medium conveying surface by a feed roller and discharges the recording medium from the recording medium conveying surface by a discharging roller, wherein the recording medium is discharged by exhausting the recording medium. A recording medium conveying device, wherein a blow-out portion to be pressed against is formed above the discharge roller. 4. The recording medium conveying device according to claim 1, wherein the discharge roller is made of a high friction material. 5. A recording apparatus comprising the recording medium conveying apparatus according to claim 1. Description: