Rotary cutter unit and printer device having the unit

A printing device comprising:

• a frame;
• a platen roller rotatably supported by the frame;
• and
• a rotary cutter unit for cutting printing paper, including:
• a rotating blade extending axially as an axial blade having a rotating body, the rotating body for the rotating axial blade has end portions and a partial cylindrical surface with an edge as the axial blade formed between the end portions to accommodate forming a detected part on the rotating body for the rotating axial blade, the rotating body for the rotating axial blade positioned inside of the frame and supported by the frame in a manner rotatable about a center axis, and
• a detecting part for detecting the detected part;
• a motor for rotating the platen roller and the rotating body;
• and
• a first transmission portion provided on one end of the center axis of the rotating body for transmitting rotating force of the motor to the rotating body, the first transmission portion positioned outside of the frame where the rotating axial blade is supported, and a second transmission portion for transmitting rotating force of the motor to the platen roller, the second transmission portion being positioned outside of the frame on a side of the frame opposite of where the first transmission portion is provided,
• wherein the partial cylindrical surface of the rotating body for the rotating axial blade accommodates positioning both the detected part formed on the rotating body for the rotating axial blade and the detecting part inside of the frame supporting the rotating body for the rotating axial blade,
• wherein the detected part is formed in a fin-shape radially outwardly extending from one of the end portions, between which the partial cylindrical surface with the edge is formed, of the rotating body positioned inside of the frame, and the detecting part is a photosensor capable of receiving the fin-shaped member.

A printing device comprising:

• a frame which includes two side frames each provided at a different end of the frame, respectively;
• a platen roller rotatably supported by the side frames;
• a rotary cutter unit for cutting printing paper, the rotary cutter unit including:
• a rotating body rotatably supported by the side frames, the rotating body including a rotating blade extending axially as an axial blade and provided on the rotating body at a position between the side frames, the rotating body for the rotating axial blade has end portions and a partial cylindrical surface with an edge for the axial blade formed between the end portions to accommodate forming a detected part on the rotating body for the rotating axial blade, an end portion of the end portions provided at one end of the rotating body positioned inside of a space between the side frames, and a transmitting member provided at the one end of the rotating body outside of one side frame, and
• a detecting part for detecting the detected part to determine whether the rotating axial blade is positioned at a home position, provided at a position inside of a space between the side frames;
• a motor for rotating the rotating body;
• a first transmission portion for transmitting rotating force of the motor to the transmitting member of the rotating body, the first transmission portion being positioned outside the one side frame;
• and
• a second transmission portion for transmitting rotating force of the motor to the platen roller, the second transmission portion being positioned outside of the other side frame different from the one side frame at which the first transmission portion is provided,
• wherein the partial cylindrical surface of the rotating body for the rotating axial blade accommodates positioning both the detected part formed on the rotating body for the rotating axial blade and the detecting part inside of the space between the side frames supporting the rotating body for the rotating axial blade,
• wherein the detected part is formed in a fin-shape radially outwardly extending from one of the end portions, between which the partial cylindrical surface with the edge is formed, of the rotating body positioned inside of the frame, and the detecting part is a photosensor capable of receiving the fin-shaped member.