Patent ID: 7197261

Claim:
A laser printer comprising: a main body housing a tray accommodating a sheet, and a printing unit printing on the sheet; a front door provided at a front side of said main body for maintenance; a rear door provided at a rear side of said main body opposite said front door and having a guide receiving the sheet from said tray to feed the sheet to said printing unit; a connection rod arranged slidably back and forth between said front and rear doors; a front protrusion provided at said front door and protruding from said front door towards said connection rod to abut against one end of said connection rod; a rear protrusion provided at said rear door and protruding from said rear door toward said connection rod to abut against the other end of said connection rod; a switch provided at said one end of said connection rod and turned on by one of said front protrusion, located closer to said one end of said connection rod, and said rear protrusion abutting against said switch; and a spring exerting force to said connection rod to bias said connection rod from said one end, provided with said switch, toward said other end, wherein said connection rod and said switch are arranged such that: when at least one of said front and rear doors is open, said connection rod is biased toward said other end and one of said front and rear protrusions does not abut against said one end; and when said front and rear doors are both closed said connection rod slides toward said one end and one of said front and rear protrusions abuts against said one end to turn on said switch.