Patent ID: 7126082

Claim:
A laser engraver comprising: a. a work surface for supporting a workpiece; b. a laser having a beam; and c. means for aiming said laser beam at said workpiece comprising a reflector disposed between said laser and said workpiece; d. means for moving said reflector relative to said workpiece comprising; i. a first rail situated along one side of said work surface; ii. a second rail situated along the opposite side of said work surface from said first rail, wherein said first and second rails are oriented parallel to one another; iii. a third rail, oriented perpendicular to said first and second rails, and slidably mounted to said first and second rails; iv. a carriage affixed to said reflector and slidably mounted to said third rail; v. means for moving said third rail along said first and second rails; and vi. means for moving said carriage along said third rail; and e. means for maintaining the focus of said laser beam on said workpiece comprising; i. a laser diode having a beam situated at one end of said third rail; ii. a receptor at the opposite side of said third rail from said laser diode; iii. a plunger body having a port between said laser diode and said receptor, wherein said port is aligned with said laser beam; iv. a plunger rod slidably received within said plunger body; v. a spring biasing said plunger rod away from said port; and vi. means for selectively raising and lowering said work surface to a predetermined distance from said reflector when said laser beam is broken.