A sheet processing apparatus for processing sheets each with a wireless tag includes a roller, a wireless tag reader/writer, and a controller configured to control the roller to convey a first sheet with a first tag along a path, control the reader/writer to acquire first strengths of radio signals received from the first tag during the conveyance and second strengths of radio signals received from wireless tags of sheets not being conveyed, determine a threshold value of signal strength for distinguishing a wireless tag being conveyed from wireless tags not being conveyed based on the first and second strengths, and control the roller to convey a second sheet with a second tag and control the reader/writer to write to the second tag when a strength of a radio signal from the second tag is greater than or equal to the threshold value.

A device and a method for making a wireless connection between a paper sensor in a roll holder and a printing device which receives a printing medium from the roll holder, in which a magnet arranged on the roll holder performs, with each turn of the pin of the roll holder, a cyclical movement which includes first a lifting of the magnet, caused by a rotation of the pin by a fraction of a turn, and then a fall by gravity of the magnet which falls near a coil which is energized by the mechanical energy of the magnet for supplying electrical energy to an emitter in wireless communication with a receiver to receive a signal with each revolution of the pin to count the revolutions made by the pin and act as a paper sensor.

A modular material tracking system is provided for tracking material stored on and drawn from a reel using a modular system. The modular material tracking system may include a detection element, digital logic components, location receiver, enclosure, analytic components, interface component, sensor module, and plate module. One or more sensors relative to the reel may detect a position indicative of forward or reverse reel rotation. A processor may analyze signals to count rotations of the reel, which is savable in memory. A battery may provide power. The system may also record the time and location associated with rotations. A method for tracking material stored on and drawn from a reel using a modular material tracking system is also provided.