Image forming apparatus, and method thereof
First Claim
1. An image forming apparatus for forming an image on a printing medium, which prints an area, by printing means, having predetermined length along the conveying direction of the printing medium and conveys the printing medium by a conveying distance corresponding to the predetermined length, repeatedly, comprising:
- convey means, which includes rollers contactable with the printing medium and driving means to rotate the rollers, for conveying the printing medium by rotating the rollers;
setting means for setting each of an angular position of each roller and a position of the printing medium along the conveying direction to predetermined positions; and
storage means for storing predetermined drive-amount data of said driving means corresponding to each angular position of the rollers, so as to convey the printing medium by the conveying distance at each angular position of the rollers,wherein said driving means rotate the rollers from the angular position set by said setting means to convey the printing medium by the conveying amount of the basis of the drive-amount data stored by said storage means.
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Abstract
In a serial page printer for printing an image line by line by scanning a printing head, even if a motor for driving a roller for conveying a printing medium is rotated by a predetermined amount, the printing medium is not conveyed by a predetermined amount depending on decentering of the roller, the position of the printing medium, and the like, resulting in a printing error. In order to prevent this, a predetermined position of the roller is brought into contact with each line of a printing medium. For this purpose, an apparatus of the present invention detects that the position of the printing medium and the state of the roller are in a predetermined state. Therefore, a line subjected to printing and the state of the roller have a predetermined relationship on any page, and the printing medium can be conveyed by a predetermined amount for each line by adjusting the rotational amount of the roller for each line in advance.
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Citations
48 Claims
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1. An image forming apparatus for forming an image on a printing medium, which prints an area, by printing means, having predetermined length along the conveying direction of the printing medium and conveys the printing medium by a conveying distance corresponding to the predetermined length, repeatedly, comprising:
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convey means, which includes rollers contactable with the printing medium and driving means to rotate the rollers, for conveying the printing medium by rotating the rollers; setting means for setting each of an angular position of each roller and a position of the printing medium along the conveying direction to predetermined positions; and storage means for storing predetermined drive-amount data of said driving means corresponding to each angular position of the rollers, so as to convey the printing medium by the conveying distance at each angular position of the rollers, wherein said driving means rotate the rollers from the angular position set by said setting means to convey the printing medium by the conveying amount of the basis of the drive-amount data stored by said storage means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A printing medium conveying method for an image forming apparatus which prints an area having predetermined length along the conveying direction of the printing medium and repeatedly conveys the printing medium by a conveying distance corresponding to the predetermined length by conveying means, wherein said convey means includes rollers contactable with the printing medium and driving means to rotate the rollers, and conveys the printing medium by rotating the rollers, comprising the steps of:
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setting each of an angular position of each roller and a position of the printing medium along the conveying direction to predetermined positions; and driving said driving means to rotate the rollers from an angular position set in said setting step to convey the printing medium by the predetermined conveying distance on the basis of the drive-amount data corresponding to conveying amount at each angular position of the rollers. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A sheet conveying apparatus comprising:
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convey means for conveying a sheet in a predetermined direction, said convey means comprising a first conveying roller and a second conveying roller, wherein the first and second conveying rollers are provided at a predetermined distance from each other in the predetermined direction, and each of which has contact with the sheet and conveys the sheet by rolling; first and second drive means for rotating the first and second conveying rollers, respectively; storage means for storing drive-amount data for said first and second driving means; setting means for setting a position of the sheet along the conveying direction to a predetermined position and each of an angular position of the first and second conveying rollers to a predetermined position; and control means for controlling a drive-amount, corresponding to a predetermined conveying amount, of the first and second driving means from each angular position of the first and second conveying rollers set by said setting means to convey the sheet on the basis of the drive-amount data stored by said storage means. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A sheet conveying method for conveying a sheet by convey means having a first conveying roller and a second conveying roller driven by first and second driving means respectively, where the first and second conveying rollers are provided at a distance from each other and convey a sheet by rolling contact with the sheet, comprising the steps of:
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setting a position of the sheet along the conveying direction to a predetermined position and each of an angular position of the first and second conveying rollers to predetermined positions; and controlling a drive-amount, corresponding to a predetermined conveying amount, of the first and second driving means on the basis of a predetermined drive-amount and each of the predetermined positions set by said setting step. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification