According to one embodiment, a mobile printer, includes an RFID writer capable of writing information to an RFID tag, such as one embedded in a merchandise tag or price tag. The mobile printer additionally includes a print head storing decolorable ink that can be made substantially invisible or indistinguishable on a merchandise tag or price tag. The print head is configured to discharge decolorable ink for printing information on a merchandise tag or price tag. The decolorable ink can be discolored/decolored after being used to print information on a merchandise tag or price tag to permit information on the merchandise tag or price tag to be changed after an initial printing.

According to one embodiment, a mobile printer, includes an RFID writer capable of writing information to an RFID tag, such as one embedded in a merchandise tag or price tag. The mobile printer additionally includes a print head storing decolorable ink that can be made substantially invisible or indistinguishable on a merchandise tag or price tag. The print head is configured to discharge decolorable ink for printing information on a merchandise tag or price tag. The decolorable ink can be discolored/decolored after being used to print information on a merchandise tag or price tag to permit information on the merchandise tag or price tag to be changed after an initial printing.

Provided are a sheet processing device and a sheet manufacturing apparatus capable of removing color material from printed parts without excess or deficiency. A sheet processing device has a detector configured to detect a printed part printed on a sheet; and an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector. The eraser includes a grinding tool to grind the sheet, and a pressure mechanism configured to selectively increase contact pressure between the sheet and the grinding tool in the printed area.

Provided are a sheet processing device and a sheet manufacturing apparatus capable of accurately processing by a processor at least the printed area of a sheet without excess or deficiency. The sheet processing device has: a conveyor configured to convey a sheet having a printed area that was previously printed; a position detector configured to detect a location of a specific part of the sheet being conveyed by the conveyor; a processor configured to execute a specific process on at least the printed area; a timing predictor configured to predict, based on a detection result from the position detector, the timing when the printed area will reach the processor; and a controller configured to control operation of the processor based on a prediction result of the timing predictor.

A sheet processing device, a sheet manufacturing apparatus, and a sheet processing method enable effectively removing the color material of printed parts. A sheet processing device for processing a printed sheets has a detector configured to detect the printed parts of the sheet; and a refining prevention agent applicator configured to selectively apply a refining prevention agent that prevents refinement of the sheet to a printed area including the printed parts detected by the detector.

A sheet processing device, a sheet manufacturing apparatus, and a sheet processing method enable effectively removing the color material of printed parts. A sheet processing device for processing a printed sheets has a detector configured to detect the printed parts of the sheet; and a refining prevention agent applicator configured to selectively apply a refining prevention agent that prevents refinement of the sheet to a printed area including the printed parts detected by the detector.

Provided are a sheet processing device and a sheet manufacturing apparatus capable of removing color material from printed parts without excess or deficiency. A sheet processing device has a detector configured to detect a printed part printed on a sheet; and an eraser configured to selectively remove at least a surface part of a printed area including the printed part detected by the detector. The eraser includes a grinding tool to grind the sheet, and a pressure mechanism configured to selectively increase contact pressure between the sheet and the grinding tool in the printed area.

A sheet processing device, a sheet manufacturing apparatus, and a sheet processing method enable effectively removing the color material of printed parts. A sheet processing device for processing a printed sheets has a detector configured to detect the printed parts of the sheet; and a refining prevention agent applicator configured to selectively apply a refining prevention agent that prevents refinement of the sheet to a printed area including the printed parts detected by the detector.

A sheet processing device, a sheet manufacturing apparatus, and a sheet processing method enable effectively removing the color material of printed parts. A sheet processing device for processing a printed sheets has a detector configured to detect the printed parts of the sheet; and a refining prevention agent applicator configured to selectively apply a refining prevention agent that prevents refinement of the sheet to a printed area including the printed parts detected by the detector.

In accordance with one embodiment, an image forming apparatus includes a printing section configured to execute at least a decolorable printing; a input section configured to receive a command from a user; a first print control section configured to execute a test printing of a printing subject image by controlling the printing section when receiving a printing command from the user, and then wait until a command is input from the user; and a second print control section configured to print the printing subject image when receiving a command to continue printing from the user after the test printing is executed by the first print control section. The test printing executed by the first print control section is the decolorable printing.