Proposed is an apparatus for supplying a roll-type material, the apparatus including an unwinder for unwinding a roll on which a material is wound, a rotation speed sensor for measuring a rotation speed of the roll, and a controller for performing a first deceleration for decelerating the rotation speed of the roll when the rotation speed of the roll is equal to or greater than a first reference rotation speed, and performing a second deceleration for decelerating the rotation speed of the roll when the rotation speed of the roll is equal to or greater than a second reference rotation speed after the rotation speed of the roll is decelerated. Accordingly, it is possible to adjust a supply speed of the material according to a remaining amount of the material without operator's control, and minimize waste of the material.

Proposed is an apparatus for supplying a roll-type material, the apparatus including an unwinder for unwinding a roll on which a material is wound, a rotation speed sensor for measuring a rotation speed of the roll, and a controller for performing a first deceleration for decelerating the rotation speed of the roll when the rotation speed of the roll is equal to or greater than a first reference rotation speed, and performing a second deceleration for decelerating the rotation speed of the roll when the rotation speed of the roll is equal to or greater than a second reference rotation speed after the rotation speed of the roll is decelerated. Accordingly, it is possible to adjust a supply speed of the material according to a remaining amount of the material without operator's control, and minimize waste of the material.

A circumferential location of a tail end of a log of convolutely wound web material is determined by rotating the log in a stationary position and a diameter of the log is sensed with a sensor at a plurality of times while rotating the log in the stationary position. A plurality of signals corresponding to the diameter of the log at the plurality of times are generated. The signals corresponding to the diameter of the log at the plurality of times a compared. A change in the signals corresponding to the diameter of the log at the plurality of times is detected and associated with the circumferential location of the tail end of the log.

A circumferential location of a tail end of a log of convolutely wound web material is determined by rotating the log in a stationary position and a diameter of the log is sensed with a sensor at a plurality of times while rotating the log in the stationary position. A plurality of signals corresponding to the diameter of the log at the plurality of times are generated. The signals corresponding to the diameter of the log at the plurality of times a compared. A change in the signals corresponding to the diameter of the log at the plurality of times is detected and associated with the circumferential location of the tail end of the log.

A printing apparatus includes a roll paper compartment 15 having a first placement surface 27 on which an outer peripheral surface Ra of a roll paper R around which a recording paper P is wound is placed and accommodating the roll paper R, a thermal head 67 performing printing on the recording paper P pulled out from the roll paper R accommodated in the roll paper compartment 15, a first projecting/retracting portion 77 provided to be configured to project from or retract into the first placement surface 27, pressed by the roll paper R of which the outer peripheral surface Ra is placed on the first placement surface 27 and retracting into the first placement surface 27 when a diameter of the roll paper R is larger than a predetermined diameter, and released from the pressure by the roll paper R and protruding from the first placement surface 27 when the diameter of the roll paper R is smaller than the predetermined diameter, and a detection section detecting projection and retraction of the first projecting/retracting portion 77.

A printing apparatus includes a roll paper compartment 15 having a first placement surface 27 on which an outer peripheral surface Ra of a roll paper R around which a recording paper P is wound is placed and accommodating the roll paper R, a thermal head 67 performing printing on the recording paper P pulled out from the roll paper R accommodated in the roll paper compartment 15, a first projecting/retracting portion 77 provided to be configured to project from or retract into the first placement surface 27, pressed by the roll paper R of which the outer peripheral surface Ra is placed on the first placement surface 27 and retracting into the first placement surface 27 when a diameter of the roll paper R is larger than a predetermined diameter, and released from the pressure by the roll paper R and protruding from the first placement surface 27 when the diameter of the roll paper R is smaller than the predetermined diameter, and a detection section detecting projection and retraction of the first projecting/retracting portion 77.