(57) An adjusting device for an impact printer includes a printing mechanism (16) with
printing heads (15) movably mounted on parallel guide shafts (12, 13). A pair of separated
side frames (17) are pivotally coupled to one of the guide shafts (12) and are connected
through a cam (18) to the other guide shaft (13) so that the side frames (17) are
pivotal about the one guide shaft (12) in response to rotation of the other guide
shaft (13). The platen (20), which is journally mounted to the side frames (17), thus
moves towards or away from the printing heads (15) as the side frames (17) are pivoted
thereby dimensionally adjusting the gap (d) between the platen (20) and the printing
heads (15) to compensate for varying thicknesses of printing sheets on the platen
(20), for example. The adjusting device is suited for use in a printer in which printing
heads (15) are hammered to print upon a printing sheet fed along a cylindrical surface
of a platen (20).
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