Abstract: An image reading device has a movable platen glass that is rotatably supported, that is substantially a prism having a plurality of read faces, and that is constructed so that rotation of the platen glass can switchably place one of the read faces in the read position. Therefore, even if the platen glass becomes stained, the image reading device makes it possible to start or continue reading document images without requiring labor and time for cleaning the platen glass.

Abstract: At forming an image only on one side of a sheet, an image forming unit is controlled by a control unit to form a back-side pattern image on the back side of the sheet. At forming images on both sides of sheets, when a blank side where no image is formed exists, similarly, the back-side pattern image is formed on the blank side. In single-sided printing, a back-side pattern image is formed on the back side of the sheet. In double-sided printing, a predetermined image is formed on a blank page and thus no blank page occurs. It is therefore possible to prevent the back side of a sheet on which an important document is printed from being used for other purpose, and consequently security is enhanced.

Abstract: Print is made on a recording paper by running an ink carriage along the supporting axis in a reciprocating motion. The ink carriage includes ink heads respectively provided with a front ink nozzle and a back ink nozzle facing their respective directions, so that print is made simultaneously at two portions on the recording paper along the transportation direction in which the recording paper is transported through a single transportation path one by one. Consequently, there can be provided an ink jet printer which can improve printing efficiency by increasing a printing rate and printing resolution, and realizing printing of an overstrike character, simultaneous printing of mixed information, double-side printing, etc.

Abstract: At forming an image only on one side of a sheet, an image forming unit is controlled by a control unit to form a back-side pattern image on the back side of the sheet. At forming images on both sides of sheets, when a blank side where no image is formed exists, similarly, the back-side pattern image is formed on the blank side. In single-sided printing, a back-side pattern image is formed on the back side of the sheet. In double-sided printing, a predetermined image is formed on a blank page and thus no blank page occurs. It is therefore possible to prevent the back side of a sheet on which an important document is printed from being used for other purpose, and consequently security is enhanced.

Abstract: An image reading device has a movable platen glass that is rotatably supported, that is substantially a prism having a plurality of read faces, and that is constructed so that rotation of the platen glass can switchably place one of the read faces in the read position. Therefore, even if the platen glass becomes stained, the image reading device makes it possible to start or continue reading document images without requiring labor and time for cleaning the platen glass.

Abstract: Print is made on a recording paper by running an ink carriage along the supporting axis in a reciprocating motion. The ink carriage includes ink heads respectively provided with a front ink nozzle and a back ink nozzle facing their respective directions, so that print is made simultaneously at two portions on the recording paper along the transportation direction in which the recording paper is transported through a single transportation path one by one. Consequently, there can be provided an ink jet printer which can improve printing efficiency by increasing a printing rate and printing resolution, and realizing printing of an overstrike character, simultaneous printing of mixed information, double-side printing, etc.

Abstract: Print is made on a recording paper by running an ink carriage along the supporting axis in a reciprocating motion. The ink carriage includes ink heads respectively provided with a front ink nozzle and a back ink nozzle facing their respective directions, so that print is made simultaneously at two portions on the recording paper along the transportation direction in which the recording paper is transported through a single transportation path one by one. Consequently, there can be provided an ink jet printer which can improve printing efficiency by increasing a printing rate and printing resolution, and realizing printing of an overstrike character, simultaneous printing of mixed information, double-side printing, etc.