Seiko I Infotech Inc.

Kiyohito Hirota

An image forming apparatus has rotatable members for rotatably retaining respective ones of flanges mounted to opposite ends of a roll sheet, and placement stages on which the roll sheet is to be placed and on which respective ones of the rotatable members are mounted. Racks are mounted to respective ones of the placement stages for undergoing movement to move the placement stages relative one another to vary a distance between the placement stages. A pinion is arranged between the racks for undergoing rotation to move the racks, and a potentiometer whose resistance value varies in accordance with a distance between the placement stages undergoing movement with rotation of the pinion is provided. An A/D converter outputs a value based on a resistance value of the potentiometer. A calculation device calculates a width of the roll sheet based on the value output from the A/D converter. A memory stores the calculated width of the roll sheet.

Image forming apparatus

An image forming apparatus has an image transferring portion for transferring an image onto a sheet, an image fixing portion for fixing the transferred image to the sheet, a sheet conveyor portion arranged between the image transferring portion and the image fixing portion for conveying the sheet in a sheet conveying direction, a support portion having an elliptical-shaped shaft hole extending in a direction crossing the sheet conveying direction, and an arm rotatably mounted on the support portion. A first spur is disposed at a position opposed to the sheet conveyor portion and is rotatably supported by the support portion and movable along the shaft hole. A second spur is disposed at a position opposed to the sheet conveyor portion downstream in a sheet conveying direction of the first spur and closer to the sheet conveyor portion than the first spur. The second spur is rotatably supported by the arm and has a movable range larger than a movable range of the first spur.

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Chiba, Japan

Kiyohito Hirota