Browse Prior Art Database

Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05

Publishing Venue

Xerox Disclosure Journal


Electrophotographic printing and copying machines frequently use interlock switches in conjunction with cabinet and platen covers to disable machine operation whenever these covers are out of place. These devices provide safety for the usedoperator and protect mechanical components from accidental damage or exposure. A mechanical interlock switch assembly that works in conjunction with an existing top cover interlock switch that interlocks both the top and front cover panels is disclosed. The interlock assembly, as shown in Figure 2, consists of a shoulder screw 1, a torsion spring 2, and two brackets. The first bracket 3 holds the shoulder screw in the fixed position. The second bracket 4 pivots around the shoulder screw. When the front cover is properly secured, an actuator bracket pivots the interlock assembly bracket out of the way for the top cover interlock switch to be activated when the top cover is properly secured. If the front cover is not properly secured, the interlock assembly bracket prevents the top cover interlock switch from being actuated. The assembly is configured so that the machine will operate only when both the front panel and top platen covers are in closed positions as shown in Figure