Parallel Link Platen Mechanism
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-07
In designing wire matrix printers which are to operate with variable thickness forms, it is necessary to provide a means to control the gap between the printhead and the form so that the gap remains constant regardless of the thickness of the form. The mechanism shown in the figure provides a means of raising and lowering a platen by using a set of parallel links and an adjusting screw or cam to accommodate the varying forms thickness. This eliminates the need to adjust the printhead as is conventionally done.