Image formation apparatus

Abstract

An image formation apparatus includes: a toner image formation section that forms a toner image on a recording medium; a fixing device that fixes the toner image; a first roller provided downstream from the fixing device in a transport direction of the recording medium, the first roller coming in contact with a first side of the recording medium and transporting the recording medium; and a second roller abutting the first roller, the second roller coming in contact with a second side of the recording medium opposite to the first side and transporting the recording medium. The solubility parameter on a surface of the first roller is different from the solubility parameter on a surface of the second roller.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

Exemplary embodiments of the present invention will be described in detail based on the following figures, wherein:

FIG. 1 is a sectional view to show the configuration of an image formation apparatus according to a first exemplary embodiment of the invention;

FIG. 2 is a schematic representation to show a transportation device used in the first exemplary embodiment of the invention;

FIG. 3 is a graph to show time change of the outer diameter of each transport roller when transport rolls made of materials different in solubility parameter are immersed in paraffin;

FIG. 4 is a graph to show the relationship between the solubility parameter of each transport roller and the outer diameter change amount of the transport roller when the transport rolls made of materials different in solubility parameter are immersed in paraffin for a time;

FIG. 5A is a graph to show the relationship between the number of transported sheets using a transport roller used in a second exemplary embodiment of the invention and the outer diameter change amount of the transport roller, and FIG. 5B is a graph to show the relationship between the number of sheets transported using the transport roller used in the second exemplary embodiment of the invention and the sheet transport speed of the transport roller;

FIG. 6 is a schematic representation to show a transportation device used in a third exemplary embodiment of the invention; and

FIG. 7A is a graph to show the relationship between the number of transported sheets using a transport roller used in a fourth exemplary embodiment of the invention and the outer diameter change amount of the transport roller, and FIG. 7B is a graph to show the relationship between the number of sheets transported using the transport roller used in the fourth exemplary embodiment of the invention and the sheet transport speed of the transport roller.

Claims

1. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image;a first roller provided downstream from the fixing device in a transport direction of the recording medium, the first roller coming in contact with a first side of the recording medium and transporting the recording medium; anda second roller abutting the first roller, the second roller coming in contact with a second side of the recording medium opposite to the first side and transporting the recording medium,wherein a solubility parameter on a surface of the first roller is different from a solubility parameter on a surface of the second roller.

2. The image formation apparatus according to claim 1, wherein the toner image is formed on the first side of the recording medium.

3. The image formation apparatus according to claim 2, wherein an absolute value of a difference between the solubility parameter of the first roller and a solubility parameter of a low-melting-point material contained in a toner of the toner image is larger than an absolute value of a difference between the solubility parameter of the second roller and the solubility parameter of the low-melting-point material.

4. The image formation apparatus according to claim 3, wherein the absolute value of the difference between the solubility parameter of the first roller and the solubility parameter of the low-melting-point material is 1.0 or more.

5. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image;a first roller provided downstream from the fixing device in a transport direction of the recording medium, the first roller being subjected to drive transmission from a drive source to transport the recording medium; anda second roller abutting the first roller, the second roller being driven by the first roller and transporting the recording medium,wherein a solubility parameter on a surface of the first roller is different from a solubility parameter on a surface of the second roller.

6. The image formation apparatus according to claim 5, wherein the first roller comes in contact with a side of the recording medium on which the toner image has been formed.

7. The image formation apparatus according to claim 6, wherein an absolute value of a difference between the solubility parameter of the first roller and a solubility parameter of a low-melting-point material contained in a toner of the toner image is larger than an absolute value of a difference between the solubility parameter of the second roller and the solubility parameter of the low-melting-point material.

8. The image formation apparatus according to claim 7, wherein the absolute value of the difference between the solubility parameter of the first roller and the solubility parameter of the low-melting-point material is 1.0 or more.

9. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image; anda roller provided downstream from the fixing device in a transport direction of the recording medium, the roller transporting the recording medium and having a transport speed lower than a target transport speed.

10. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image; anda roller provided downstream from the fixing device in a transport direction of the recording medium, the roller coming in contact with a side of the recording medium on which the toner image has been formed and transporting the recording medium,wherein an absolute value of a difference between a solubility parameter on a surface of the roller and a solubility parameter of a low-melting-point material contained in a toner of the toner image is 1.0 or more.

11. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image;a downstream roller transporting the recording medium and being provided downstream from the fixing device in a transport direction of the recording medium; andan upstream roller transporting the recording medium and being positioned downstream from the fixing device and upstream from the downstream roller in the transport direction,wherein a solubility parameter on a surface of the upstream roller is different from a solubility parameter on a surface of the downstream roller.

12. The image formation apparatus according to claim 11, wherein both upstream roller and downstream roller come in contact with a side of the recording medium on which the toner image has been formed, and an absolute value of a difference between the solubility parameter of the upstream roller and a solubility parameter of a low-melting-point material contained in a toner of the toner image is larger than an absolute value of a difference between the solubility parameter of the downstream roller and the solubility parameter of the low-melting-point material.

13. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image;a downstream roller transporting the recording medium and being provided downstream from the fixing device in a transport direction of the recording medium; andan upstream roller transporting the recording medium and being positioned downstream from the fixing device and upstream from the downstream roller in the transport direction,a difference between a target transport speed of the recording medium and a setup transport speed of the upstream roller is larger than a difference between the target transport speed and a setup transport speed of the downstream roller.

14. An image formation apparatus comprising: a toner image formation section that forms a toner image on a recording medium;a fixing device that fixes the toner image;a first roller provided downstream from the fixing device in a transport direction of the recording medium, the first roller coming in contact with a first side of the recording medium and transporting the recording medium, and the first roller having a transport speed lower than a target transport speed of the recording medium; anda second roller abutting the first roller, the second roller coming in contact with a second side of the recording medium opposite to the first side and transporting the recording medium,wherein a solubility parameter on a surface of the first roller is different from a solubility parameter on a surface of the second roller.

15. The image formation apparatus according to claim 14, wherein the toner image is formed on the first side of the recording medium.