Hammer Rattling in a Line Printer
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
In a high speed line printer, printing often occurs in set print patterns such as the listings of inventory with several columns of the page being used very often, whereas other columns such as a total or subtotal may be set up to print in a column that has not been used for the entire page. Other jobs may use the first eighty columns of print for several hours until the job is changed, with the new job printing many of the unused columns of the previous job. In both these examples the problem is similar; the first time a print position is used the resultant hammer impact against the print band is late because the pivots, backstop, and push rods of the print mechanism have relaxed from their dynamic to static conditions. The printed character in the worst case can be unreadable.