JP2007039186A - Paper delivery mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deflection from having influence on reading and the formation of an image by achieving stable delivery processing by forming stiffness by deflecting paper when delivering the paper. <P>SOLUTION: This paper delivery mechanism is composed of a delivery roller and a driven roller as a delivery mechanism for delivering the paper, and forms the stiffness in the paper in delivery by having a ring for deflecting the paper in at least one of the delivery roller or the driven roller, and has a paper deflection restraining means for pressing down the paper from the opposite side of a ring in close vicinity to the stiffness forming ring. An auxiliary wheel integral with or separate from the delivery roller may by arranged as this paper deflection restraining means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper discharge mechanism such as a scanner device, and in order to realize stable paper discharge, the paper is bent by being bent at the time of discharge, and the bending does not affect the reading and forming of an image. The present invention relates to a technique for realizing the above.

  If the paper is thin when the paper is ejected by a scanner device, etc., if the paper is not bent and the paper is ejected as it is, the paper will hang down due to gravity after being ejected from the ejection port. Will come into contact.

  When trying to stack in such a state, the sheets may be reversed or stacked in various directions, and the stack operation may become extremely unstable.

  Therefore, in order to solve such a problem, as shown in FIG. 1, the paper is bent when the paper is discharged, the paper is stiffened, and after the paper is discharged from the discharge port, the paper may drop due to gravity. A paper discharge mechanism has been devised so as not to do so (see Patent Document 1).

  However, with the conventional mechanism that bends the paper and stiffens the paper, the deflection of the paper at the time of ejection may extend to the image reading and forming part, causing gradation fluctuations when reading the image, In some cases, an adverse effect such as distortion of the image may occur during image formation.

JP-A-11-171388

  As described above, the conventional techniques have the following problems.

  In paper discharge mechanisms such as scanners and printers, if the paper is thin and the paper is discharged without being bent, the paper hangs down due to gravity when stacked on the stacker, and the paper is reversed when discharged. It tends to be unstable, such as being discharged in various directions.

  In order to prevent such a situation, an apparatus has been devised in which a sheet is bent when the sheet is discharged and the sheet is stiffened so that the sheet does not hang down and is stably stacked.

  However, in such an apparatus, the deflection of the sheet when the sheet is discharged reaches the image reading unit and the forming unit, and may adversely affect the image reading and forming.

  SUMMARY OF THE INVENTION An object of the present invention is to realize a stable discharge process by bending a sheet and applying a stiffness when the sheet is discharged, and to prevent the bending from affecting the reading and forming of an image.

  In order to solve the above problems, the present invention takes the following means.

  As a paper discharge mechanism that discharges paper, the paper discharge mechanism is composed of a discharge roller and a driven roller, and at least one of the discharge roller or the driven roller is provided with a ring for bending the paper so that the paper is firm when discharged. In addition, in the vicinity of the stiffness-imparting ring, a sheet deflection suppressing means for pressing the sheet from the side opposite to the ring is provided.

  As the sheet deflection suppressing means, an auxiliary wheel that is integral with or separate from the discharge roller may be provided.

  According to the present invention, the following effects can be expected.

  In a paper discharge mechanism such as a scanner, even if the paper is thin, the paper discharge process can be performed stably by applying the minimum necessary paper stiffness, and the image reading and forming portion can be bent for paper stiffness. By avoiding this, it is possible to prevent the reading and formation of the image from being adversely affected.

  The present invention takes the following embodiments.

  As the paper discharge mechanism, a ring having a diameter larger than the diameter of the roller to be attached is provided beside at least one of the discharge roller and the driven roller.

  Accordingly, the sheet can be bent by bending the sheet when the sheet is discharged.

  On the side opposite to the ring, a sheet bending suppression means for suppressing the sheet bending by pressing the discharged sheet is provided so as to be close to the ring.

  This makes it possible to apply a minimum amount of paper that is necessary for stabilizing paper discharge, and to prevent the paper from being bent in the image reading and forming unit, thereby adversely affecting image reading and forming. Can be eliminated.

  As the sheet deflection suppressing means, an auxiliary wheel that is integral with or separate from the discharge roller may be used.

  As a result, when the thick paper is discharged, even if the paper does not contact the roller by the ring provided on the discharge roller and the drive is not transmitted, the drive for discharging can be obtained by this auxiliary wheel.

  A typical embodiment according to the present invention will be described with reference to the drawings. In the following, the same portions are denoted by the same reference numerals, and detailed description may be omitted.

  In the following description, a paper discharge mechanism in the image reading apparatus will be described. The image forming apparatus theoretically exhibits the same effect.

  As shown in FIG. 2, in a general image reading apparatus, document sheets stacked on a hopper 10 are picked by a pick roller 9 and conveyed toward a reading unit 5 by a driving roller 7 and a driving roller side driven roller 8. Then, the original paper is brought into close contact with the glass surface 4, the original is read by an optical reading device such as a CCD at a reading point 6, the original paper is discharged by the discharge roller 1 and the discharge roller side driven roller 2, and the stacker 3 is discharged. The original paper is stacked.

  At this time, when the original paper is thin paper, the original paper that has passed through the discharge roller 1 and the discharge roller side driven roller 2 hangs down due to gravity and hangs down on the stacker 3 to come into contact with the paper. Stacking becomes unstable when stacked in various directions.

  Therefore, as shown in FIG. 3, by providing a stiffness-imparting ring 11 beside the ejection roller side driven roller 2, the ejection roller 1 and the ejection roller can be obtained by bending the original paper 12 and applying stiffness. The original paper 12 does not hang down when passing through the side driven roller 2 and is stably stacked on the stacker 3.

  However, when the original paper 12 is bent in this manner, as shown in FIG. 3, the original paper 12 is also bent at the reading point 6 where the image is read, and the gradation of the image reading is changed. was there.

  Therefore, as shown in FIGS. 4 and 6, by providing the auxiliary wheel 13b that suppresses the deflection of the original paper 12 from the side opposite to the crimping ring 11, a minimum of the deflection of the paper is necessary for the stiffness. Therefore, the original paper 12 can be brought into close contact with the glass surface 4 at the reading point 6 to prevent the reading process from being adversely affected.

  As the paper bending suppression means, in addition to the auxiliary wheel 13b separated from the discharge roller as shown in FIG. 6, a guide member 13a as shown in FIG. 5 or a discharge as shown in FIG. A roller-integrated auxiliary wheel 13c may be used.

  As a material for the auxiliary wheel, a rubber material or a sponge material may be used.

  As described above, the embodiments of the present invention have been described for the case of the image reading apparatus. However, in the image forming apparatus as well, the reading point is merely changed to the image forming point as described above, and the deflection of the paper does not reach the image forming point. And adverse effects on image formation can be eliminated.

It is explanatory drawing of the mechanism in which the conventional paper is bent and the paper is stiffened. 1 is a first embodiment of an image reading apparatus. It is an example of the apparatus which added the ring for attaching a paper to a paper. It is an example of the apparatus provided with the paper bending suppression means for a sticking. This is an example in which a guide member is used as a sheet deflection suppressing unit. This is an example in which an auxiliary wheel separate from the discharge roller is used as the sheet deflection suppressing means. This is an example in which an auxiliary wheel integrated with the discharge roller is used as a sheet deflection suppressing means.

Explanation of symbols

1: discharge roller 2: driven roller side driven roller 3: stacker 4: glass surface 5: reading unit 6: reading point 7: driving roller 8: driving roller side driven roller 9: pick roller 10: hopper 11: stiffness attaching ring 12: manuscript paper 13a: guide member 13b: auxiliary wheel 13c: discharge roller integrated auxiliary wheel

Claims (2)

As a paper discharge mechanism that discharges paper, the paper discharge mechanism is composed of a discharge roller and a driven roller, and at least one of the discharge roller or the driven roller is provided with a ring for bending the paper so that the paper is firm when discharged. ,
Providing a sheet deflection suppressing means for pressing the sheet from the opposite side of the ring in the vicinity of the stiffness-imparting ring,
A paper discharge mechanism characterized by that. As the sheet deflection suppressing means, an auxiliary wheel that is integral with or separate from the discharge roller is provided.
The paper discharge mechanism according to claim 1.

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