초록 ▼

A trolley of a printer includes a pair of angularly upright projecting dovetail-like fingers spaced apart near a left edge thereof, and a spring biased wedge pin located near a right edge thereof, for slideably engaging chamfer-like surfaces on the left and right-hand sides of a printhead assembly,

A trolley of a printer includes a pair of angularly upright projecting dovetail-like fingers spaced apart near a left edge thereof, and a spring biased wedge pin located near a right edge thereof, for slideably engaging chamfer-like surfaces on the left and right-hand sides of a printhead assembly, respectively, for permitting the assembly to be snapped into and out of retention upon the trolley, the trolley further including right and left hand leaf springs located near its rear edge for pushing the printhead assembly forward toward the front edge of the trolley to a forwardmost position determined by one of the pair of dovetail-like fingers striking a “stop”located upon one side of the printhead assembly for preventing further forward movement, whereas the printhead assembly is pushed rearward upon the trolley in the event of a paper jam developing between the printhead and a platen.

대표청구항 ▼

In a printer, the combination comprising: a printhead assembly having front and back surfaces connected by opposite sidewalls, and including at least first and second horizontally aligned downwardly projecting chamfered surface means located on said opposite sidewalls of said assembly relative to sa

In a printer, the combination comprising: a printhead assembly having front and back surfaces connected by opposite sidewalls, and including at least first and second horizontally aligned downwardly projecting chamfered surface means located on said opposite sidewalls of said assembly relative to said printhead, for providing hold-down or fastening surfaces for said assembly; means providing a mounting surface for receiving said printhead assembly; at least a first angularly upright projecting finger means rigidly attached to said mounting surface means at a position thereon for slideably engaging an edge of said first chamfered surface means of said printhead assembly; spring biased wedge pin means rigidly mounted at another position upon said mounting surface means for slideably engaging an edge of said second chamfered surface means of said printhead assembly, for permitting said printhead assembly to be “snapped”into or out of captive retention upon said mounting surface means, wherein when in such captive retention, said wedge pin means both exerts a downward force upon said second chamfered surface means, and another force upon said printhead assembly for pushing said second chamfered surface means of said printhead assembly into engagement with said first finger means, causing the latter to exert a downwardly projecting force upon the former; and leaf-spring means rigidly mounted and positioned upon said mounting surface means for applying a forward projecting force upon the back surface of said printhead assembly.