Feeder, image-forming device, and remaining amount detecting method

A feeder comprising:

• a sheet placement part that can accommodate a plurality of recordable media in a stack of sheets, and that can linearly move in a direction in which the recordable media are stacked, to introduce the recordable media into a sheet conveyor mechanism;
• and
• a shift amount indicator part that enables a shift amount of the sheet placement part to be electrically transmitted to an external device,
• wherein the shift amount indicator part includes a plurality of slits that constitute a part of the sheet placement part.

An image-forming device comprising:

• a feeder including a sheet placement part that can accommodate a plurality of the recordable media in a stack of layered sheets, and rotate and shift to a suitable position for feeding the recordable media, and a shift amount indicator part that is configured to rotate in a direction of rotation of the sheet placement part as the sheet placement part rotates, so as to indicate a shift amount of the sheet placement part;
• a printing part that performs printing onto the recordable media;
• a sheet conveyor mechanism that conveys the recordable media fed from the sheet placement part in the feeder through the printing part;
• a detector that detects the shift amount of the sheet placement part indicated by the shift amount indicator part;
• a controller that calculates a remaining amount of the recordable media stored in the sheet placement part based upon the shift amount of the sheet placement part detected by the detectors,
• a dispenser mechanism that dispenses the recordable media from the sheet placement part to the printing part;
• and
• a shift mechanism that shifts the sheet placement part to a home position,
• wherein the sheet placement part is configured to be shiftable from the home position in which the recordable media comes into contact with the dispenser mechanism, and
• wherein the detector detects the shift amount of the sheet placement part from the home position to the position in which the recordable media comes into contact with the dispenser mechanism.