Abstract: A first case component includes a first drive-side sidewall and a first support-side sidewall. A second case component includes a second drive-side sidewall and a second support-side sidewall. Each sidewall has a feed portion and a take-up portion. The feed portions and the take-up portions of the sidewalls in each case component are provided with male engagement claws that are projected from the edges of the sidewalls towards the opposing case component, and are also provided with female engagement claws which are disposed inward of the edges of the sidewalls and are engageable to the corresponding male engagement claws of the opposing case component. Thus, the first case component and the second case component are detachably combined with each other at four sections by engaging the male engagement claws with the female engagement claws.

Abstract: A printer is disclosed. The printer includes a platen roller that is rotated as a main driving source. A driving force transmitted to the platen roller is further transmitted to first and second feeding rollers so that the first and second feeding rollers rotate such as to follow the platen roller.

Abstract: A sheet feed mechanism is provided. In a sheet feed mechanism, a first sheet feeding device includes a first sheet feed roller and a first pressure contact roller that can be in pressure contact with the first sheet feed roller. The sheet feed mechanism further includes a recording sheet, which can be conveyed downstream by the rotation of the first sheet feed roller while being held in pressure contact between the first sheet feed roller and the first pressure contact roller. The first pressure contact roller is connected to a pressure contact release mechanism that can release the pressure contact of the first pressure contact roller with the first sheet feed roller. The pressure contact release mechanism is provided near the center in an axial direction of the first pressure contact roller.

Abstract: An ink ribbon cassette is provided. The ink ribbon cassette includes a ribbon outlet provided near a first ribbon-receiving part of an ink ribbon cassette of the invention in a head insertion opening. A ribbon winding opening is provided near a second ribbon-receiving part in the head insertion opening. A first paper guide is provided at the ribbon outlet and a second paper guide is provided at the ribbon winding opening so that a recording paper to be fed is guided by the first and second paper guides.

Abstract: An ink ribbon cassette is provided. A first and second ribbon-receiving parts of an ink ribbon cassette according to the invention includes wallsthat face each other with a predetermined distance therebetween. An ink ribbon slides on a first ribbon-sliding portion formed at a first wall of the first ribbon-receiving part and a second ribbon-sliding portion formed at a first wall of the second ribbon-receiving part, and is wound on a take-up reel from the feeding reel. A ribbon guide, which prevents the ink ribbon exposed at the second ribbon-sliding portion from coming in contact with a printer body (not shown) when the ink ribbon cassette is mounted in the printer body, is provided outside the second ribbon-sliding portion.

Abstract: A paper feed mechanism is provided. The paper feed mechanism includes a pair of paper feed rollers at the upstream side and the downstream side of a printing device in a direction in which a recording paper is fed during printing, and press contact rollers in press contact therewith. The back surface of the recording paper receives a pushing force from projections formed on the pair of paper feed rollers by a predetermined depth such that the recording paper is fed during printing by the printing device.