An object of the present invention is to provide a cassette shutter in which the durability of a curved shutter for opening and closing a medium entrance of a cassette is improved, and assembly of parts is simple. In the present invention for achieving said objective, a cassette shutter, which is slidably disposed on front and bottom surfaces of a cassette storing a paper medium therein and opens and closes an entrance formed in the front surface of the cassette, is configured to include: a plurality of pieces arranged longitudinally and a fastening pin that passes through and thereby fastens a lower portion of an upper-side piece and an upper portion of a lower-side piece so as to enable relative rotation of the plurality of pieces.

An object of the present invention is to provide a cassette shutter in which the durability of a curved shutter for opening and closing a medium entrance of a cassette is improved, and assembly of parts is simple. In the present invention for achieving said objective, a cassette shutter, which is slidably disposed on front and bottom surfaces of a cassette storing a paper medium therein and opens and closes an entrance formed in the front surface of the cassette, is configured to include: a plurality of pieces arranged longitudinally and a fastening pin that passes through and thereby fastens a lower portion of an upper-side piece and an upper portion of a lower-side piece so as to enable relative rotation of the plurality of pieces.

A rotation cover opening/closing mechanism includes a transparent plate-shaped cover, a shaft body, and a turning mechanism. The cover closes an opening portion formed in a part of an upper surface of device body. One end of the shaft body is perpendicularly fixed to the cover, and at least a part of the shaft body at the other end of the shaft body is inserted into the device body. The turning mechanism rotatably supports the shaft body inside the device body to allow turning of the cover around the shaft body in a plane parallel with the upper surface of the device body. The turning mechanism includes a limitation portion that limits a rotation angle of the shaft body to a fixed range such that the cover turns between a cover closing position where the cover closes the opening portion, and a cover opening position where the cover opens the opening portion.

A cam projection sliding in a cam slot of an arm causes the arm to proceed to an arm when a shutter is in the closed position or the open position and to recede from the arm when the shutter is sliding between the open position and the closed position. A spring is thereby considerably displaced, providing a satisfactory operation of the shutter.

A cam projection sliding in a cam slot of an arm causes the arm to proceed to an arm when a shutter is in the closed position or the open position and to recede from the arm when the shutter is sliding between the open position and the closed position. A spring is thereby considerably displaced, providing a satisfactory operation of the shutter.

A rotation cover opening/closing mechanism includes a transparent plate-shaped cover, a shaft body, and a turning mechanism. The cover closes an opening portion formed in a part of an upper surface of device body. One end of the shaft body is perpendicularly fixed to the cover, and at least a part of the shaft body at the other end of the shaft body is inserted into the device body. The turning mechanism rotatably supports the shaft body inside the device body to allow turning of the cover around the shaft body in a plane parallel with the upper surface of the device body. The turning mechanism includes a limitation portion that limits a rotation angle of the shaft body to a fixed range such that the cover turns between a cover closing position where the cover closes the opening portion, and a cover opening position where the cover opens the opening portion.