JP2005074773A - Image recording device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image recording device which can maintain a transfer precision of papers high, and can also lower costs by a simple configuration without degrading an image quality of photographic recording. <P>SOLUTION: The image recording device has a recording head set at a recording region, a driven roller set at the upstream side of the recording head, a driven roller set at the downstream side of the recording head, a driven belt stretched between the two driven rollers, a feeding side transfer means set at the upstream side of the upstream side driven roller for transferring a recording paper before recording to the recording region, and a paper discharging side transfer means set at the downstream side of the downstream side driven roller for transferring the recording paper after recording from the recording region. A paper transfer force F1 of the feeding side transfer means, a paper transfer force F2 of the driven belt and a paper transfer force F3 of the paper discharging side transfer means are set to be F3≥F1>F2. A paper transfer velocity V1 of the feeding side transfer means, a paper transfer velocity V2 of the driven belt and a paper transfer velocity V3 of the paper discharging side transfer means are set to be V3≥V1≥V2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image recording apparatus having a recording paper transporting means for transporting a recording paper, and performing print recording in line units on the recording paper when the recording paper is transported by the recording paper transporting means. The present invention also relates to an image recording apparatus using a non-contact recording method such as an ink jet method as a recording means.

In general, an inkjet recording apparatus is an apparatus that performs recording on a recording medium by ejecting ink from a recording head. The recording head can be easily downsized, high-definition images can be recorded at high speed, the running cost is low, the non-impact method is low noise, and color images are made using multi-colored ink. Has the advantage of being easy to record. Among them, a full line type apparatus using a line type recording head in which a large number of nozzles are arranged in the paper width direction can further increase the recording speed.
However, in the full-line type apparatus, the distance from the most upstream recording head to the most downstream recording head becomes considerably long, so that the recording paper is lifted in the recording area, and the recorded image Cause disturbances and jams.

  As a technique that can solve this problem, a technology has been proposed in which a platen is provided on the back side of the recording paper and the recording paper is attracted to the platen side by sucking the recording paper from the back side (for example, Patent Documents 1 and 2).

JP-A-8-192544

JP-A-9-58897

  However, the above prior art has the following problems. That is, in the case of the paper feeding structure disclosed in Patent Document 1, a plurality of holes are provided in the platen plate, and the recording paper is conveyed while being attracted to the platen plate by sucking air from the plurality of holes. Therefore, the sliding resistance of the recording paper increases when the recording area becomes wide like a wide recording paper or a full-line type apparatus. When the sliding resistance of the recording paper increases as described above, there are problems that the feeding accuracy of the recording paper is adversely affected, and troubles such as an increase in conveyance and a paper breakage are caused.

  In addition, since the suction conveyance device disclosed in Patent Document 2 is configured to have a plurality of holes in the conveyance flat belt, the conveyance flat belt is manufactured to satisfy the conveyance accuracy of the recording paper. In addition, a very high accuracy is required for the drive mechanism and the like, and the cost becomes high.

  The present invention has been made in order to solve the above-described problems of the prior art, and the object of the present invention is to maintain high paper conveyance accuracy without degrading the image quality of print recording. In addition, an object of the present invention is to provide an image recording apparatus having a simple configuration and capable of reducing the cost.

  The object is stretched between the recording head provided in the recording area, the driven roller provided upstream of the recording head, the driven roller provided downstream of the recording head, and the two driven rollers. A driven belt, a supply side conveying means provided on the upstream side of the upstream side driven roller for conveying the recording paper before recording to a recording area, and a downstream side of the downstream side driven roller provided after recording. Paper discharge side conveyance means for conveying the recording paper from the recording area, paper conveyance force F1 of the supply side conveyance means, paper conveyance force F2 of the driven belt, and paper conveyance of the paper discharge side conveyance means Force F3 is set to F3 ≧ F1> F2, and the sheet conveying speed V1 of the supply side conveying means, the sheet conveying speed V2 of the driven belt, and the sheet conveying speed V3 of the discharging side conveying means, This is achieved by setting V3 ≧ V1 ≧ V2.

  According to the present invention, the recording paper is accurately conveyed in a state where a predetermined tension is applied by a difference between the conveying speed of the paper feeding side conveying means and the conveying speed of the paper discharging side conveying means, or a dancer roller, In the recording area, the fluctuation of the recording paper is regulated by the driven belt, and because of the driven resistance, fluctuations in the tension on the paper can be minimized, and an increase in conveyance that adversely affects the feeding accuracy of the recording paper, and consequently the paper breaks. There is provided an image recording apparatus that can maintain high paper conveyance accuracy without causing troubles such as the above, and that can reduce the cost without degrading the image quality of print recording and with a simple configuration. be able to.

  An embodiment of the present invention will be described below with reference to FIG.

  FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

  In FIG. 1, reference numeral 1 denotes a recording paper roll, in which a recording paper (recording sheet) 1 ′ as a recording medium is wound around the outer periphery of a paper tube. In this embodiment, the case of an ink jet color recording apparatus will be described below. Here, the material of the recording paper 1 ′ may be pulp paper, a plastic film sheet, or the like, or may be chemically synthesized paper or paper in which those materials are combined. It is preferable that recording is possible and less expansion / contraction. There are various recording methods such as an electrophotographic method and a thermal transfer method, but the present invention is also applicable to recording methods other than the ink jet method.

  In this recording apparatus, a driving roller 2a is provided as a supply-side conveying means 2 for conveying the recording sheet from the set position side of the recording sheet 1 ′ to the recording area, and the recording sheet is recorded downstream from the recording area 101. A driving roller 3a is provided as the sheet discharge side conveying means 3 for conveying the sheet to be discharged from the area.

  Each of the driving rollers 2a and 3a has auxiliary driving rollers 2b and 3b, and applies a conveying force by sandwiching the recording paper 1 'with the driving roller. A recording paper winding system 4 or a cutting system (not shown) is arranged on the downstream side of the paper discharge side conveying means 3. The recording area 101 is provided with a recording head. In this embodiment, the recording area 101 is an ink jet head having a line configuration that covers the recording area 101, and forms an image on the moving recording paper 1 ′.

  A plurality of different colors of ink are supplied to the recording heads 101k, 101c, 101m, and 101y. In this embodiment, four colors of Y, M, C, and K are used. A color image is formed. On the opposite surface of the recording area 101, a driven roller 11 provided on the upstream side of the recording head provided in the recording area, a driven roller 12 provided on the downstream side of the recording head, and the two driven rollers are stretched. It has a driven belt 13 that is hung.

  The sheet conveying force F1 of the supply side conveying means 2, the sheet conveying force F2 of the driven belt 13, and the sheet conveying force F3 of the paper discharge side conveying means 3 are set such that F3 ≧ F1> F2, and the supply The sheet conveying speed V1 of the side conveying means 2, the sheet conveying speed V2 of the driven belt 13, and the sheet conveying speed V3 of the discharge side conveying means 3 are set to V3 ≧ V1 ≧ V2.

  The recording sheet 1 ′ is transported by the supply side transport unit 2 and the paper discharge side transport unit 3. The recording paper 1 ′ is controlled in paper conveyance speed by the paper discharge side conveyance means 3, and the recording heads 101 k, 101 c, 101 m and 101 y execute the printing process in accordance with the paper conveyance speed V 3 of the paper discharge side conveyance means 3. . At this time, by setting the transport speed V3 of the paper discharge side transport means 3 to be higher than the transport speed V1 of the paper feed side transport means 2, a tension can be generated on the recording paper 1 '. It is conveyed without disturbing the behavior due to moderate tension. Further, as a means for applying tension, not only a method using the conveyance speed of the paper feeding side conveyance means 2 and the paper discharge side conveyance means 3, but also a dancer roller (not shown) may be used. For example, an appropriate method may be used.

  In the recording area 101, the recording paper 1 'is a driven roller 11 provided on the upstream side of the recording head, a driven roller 12 provided on the downstream side of the recording head, and a driven belt stretched around these two driven rollers. It is conveyed in contact with 13.

  In the absence of the driven belt 13, the longer the distance between the driven roller 11 and the driven roller 12, and the lower the tension of the recording paper 1 ', the lower the natural frequency of the recording paper 1'. Will become bigger.

  The tension that can be applied to the recording paper 1 ′ has a limit depending on the material, and is about 100 N for general printing paper. However, in this embodiment, the fluttering of the recording paper 1 ′ can be reduced by the driven belt, and by selecting the material of the driven belt 13, it is possible to give a high tension to the driven belt 13. It is possible to increase the natural frequency of the upper recording paper 1 'and reduce the fluttering amount.

  Further, it is composed of a driven roller 11 provided on the upstream side of the recording head, a driven roller 12 provided on the downstream side of the recording head, and a driven belt 13 stretched around these two driven rollers 11 and 12. Therefore, it is possible to minimize fluctuations in the tension of the recording paper 1 ′ and increase in the transport load without generating sliding resistance.

  As described above, the recording head provided in the recording area 101, the driven roller 11 provided on the upstream side of the recording head, the driven roller 12 provided on the downstream side of the recording head, and these two driven rollers. Supply side conveying means 2 having a driven belt 13 stretched and provided on the upstream side of the upstream side driven roller 11 for conveying the recording paper 1 ′ before recording to the recording area 101; and the downstream side The recording paper is provided with a predetermined tension by providing a paper discharge side conveying means 3 provided on the downstream side of the driven roller 12 for conveying the recording paper 1 ′ after recording to discharge from the recording area 101. In the recording region 101, the driven belt 13 regulates the fluttering of the recording paper 1 'without causing sliding resistance, and the recording paper 1' varies in tension and increases the transport load. The minimum Can be suppressed.

1 is an overall configuration diagram illustrating a paper transport system of an image recording apparatus according to an embodiment of the present invention.

Explanation of symbols

1 is a recording paper roll, 1 'is recording paper, 2 is a paper feeding side conveying means, 2a is a driving roller, 2b is a driving auxiliary roller, 3 is a paper discharging side conveying means, 3a is a driving roller, 3b is a driving auxiliary roller, 4 is a recording paper winding system, 11 is a driven roller, 12 is a driven roller, 13 is a driven belt, 101 is a recording area, 101k, 101c, 101m, and 101y are recording heads.

Claims (5)

  A recording head provided in a recording area in an image recording apparatus that has a recording sheet conveying unit that conveys a recording sheet, and performs recording on a line basis on the recording sheet when the recording sheet is conveyed by the recording sheet conveying unit. A driven roller provided on the upstream side of the recording head, a driven roller provided on the downstream side of the recording head, a driven belt stretched around these two driven rollers, and an upstream side of the upstream driven roller A supply-side conveyance means for conveying the recording paper before recording to the recording area, and a discharge-side conveyance for conveying the recording paper after recording from the recording area provided on the downstream side of the downstream driven roller. A sheet conveying force F1 of the supply-side conveying means, a sheet conveying force F2 of the driven belt, and a sheet conveying force F3 of the discharge-side conveying means are set such that F3 ≧ F1> F2. , Paper transport of the supply side transport means A degree V1, the sheet conveying speed V2 of the driven belt, a sheet conveying speed V3 of the sheet ejection side conveyance means, an image recording apparatus being characterized in that set V3 ≧ V1 ≧ V2.   The image recording apparatus according to claim 1, wherein the print recording means has a plurality of colors and enables color image recording.   2. The image recording apparatus according to claim 1, wherein the print recording means is a drop-on-demand ink jet head arranged in a plane.   2. The image according to claim 1, wherein the conveying speed of the paper discharge side conveying means is set larger than the conveying speed of the paper feeding side conveying means as means for applying tension to the recording paper during conveyance of the recording paper. Recording device. The image recording apparatus according to claim 1, wherein a dancer roller is provided as means for applying tension to the recording paper during conveyance of the recording paper.

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