Patent attributes
Provided is a platen roller retaining structure which is small, of a simple construction and easily allows attachment/detachment of a platen roller and which provides a high level of reliability in terms of platen roller retention. A shaft portion (2a) of a platen roller (2) is fitted into a connecting portion (3a) of a regulating member (3), and the shaft portion (2a) and an engagement portion (3b) of the regulating member (3) are respectively inserted into a first recess (5) and a second recess (6) of a stationary frame (4), with an outer peripheral portion (2b) of the platen roller (2) being held in contact with a thermal head (1) to make recording possible. Escape of the shaft portion (2a) from the first recess (5) in direction (A) is prevented by an inner peripheral edge (5a). Escape of the shaft portion (2a) toward an opening portion (5b) in direction (B) without being obstructed by the inner peripheral edge (5a) is prevented since the engagement portion (3b) abuts an inner peripheral edge (6a) and cannot move indirection (B). Removal of the platen roller (2) is possible only when the engagement portion (3b) has been caused to escape in direction (C) from the second recess (6), with the shaft portion (2a) being kept retained within the first recess (5).
