| 摘要 |
A platen assembly for feeding and holding single or multi-layer record media (forms) for printing thereon, particularly useful in connection with a matrix type printer of a point-of-sale terminal. This assembly comprises one of a pair of feed rollers pivotally mounted so as to yieldingly engage and hold both sides of the record media, while a platen yieldingly engages and holds the record media against guides which determine the gap between the matrix head for proper operation of the printer wires. For line-by-line printing, the platen is first disengaged from the record media while the power feed rollers move the record media the required distance before the platen again engages the media. This platen assembly is particularly characterized by having the platen free-floating or mechanically disconnected from the rest of the assembly except through resilient means which permits the platen to assume an orientation commensurate with the orientation of the lower surface of the record media thus accommodating variations in thicknesses of the media, whether the variations in thickness are in the length of the media, such variations caused, for example, by a fold or crease in one of the layers.
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