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Slow Rattle Cycle

IP.com Disclosure Number: IPCOM000043164D
Original Publication Date: 1984-Jul-01
Included in the Prior Art Database: 2005-Feb-04

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Test, MG Whitehead, K [+details]


This article discusses the use of rattle cycles during the initial print actuating time of matrix printers. When a print actuating armature returns to the home position after propelling a print wire to the ribbon and paper, it strikes a backstop with a high velocity. This causes excessive wear on the armature and the backstop. Because an oil film is applied onto the backstop to reduce wear, the armature will have a tendency to stick if no printing takes place after two hours or so. Therefore, the use of rattle cycles to exercise the armature takes place prior to any printing to prevent print failures caused by sticking armatures. Various tests were performed to determine the optimum number of rattles needed to free the armature from the backstop, the various voltages required and the time needed to apply the voltage.