Patent ID: 7785025
Filing Date: 2010-08-31
Classification: B41J

Abstract:
1. A point of sale printer comprising: a housing defining a cavity; a cover including a first end and a second end, the first end of the cover pivotally coupled to the housing; a first biasing member in operable communication with the housing and the cover, the first biasing member biasing the cover in a direction toward an open state; a shaft rotatably connected to the second end of the cover; a thermal print head including a heat sink, a cover detent feature and a second biasing member, the cover detent feature secures the cover to the housing in a closed state and the second biasing member biasing the cover detent feature; a platen attached to the shaft; a platen drive roller attached to one end of the shaft such that the platen drive roller co-rotates with the platen; a drive motor including a drive shaft having a rotational axis, the drive motor fixedly secured within the cavity of the housing; a drive roller attached to the drive shaft of the drive motor; a link member including a first end and a second end, the first end of the link member rotatably attached to the drive shaft, the link member configured to rotate about the rotational axis of the drive motor; and an idler roller rotatably connected to the second end of the link member, the idler roller configured to be in physical communication with the platen drive roller and the driver roller, wherein a first rotational direction of the drive shaft corresponds to a first rotational direction of the link member, which in turn corresponds to a normal, paper advancement operation of the printer and rotation of the idler roller, which maintains the cover in a closed state, and wherein a second rotational direction of the drive shaft corresponds to a second rotational direction of the link member, which in turn, corresponds to an elevation of the idler roller which allows the platen to force the cover detent feature to release the cover.