Electric heating – Metal heating – By arc
Reexamination Certificate
2007-09-25
2007-09-25
Elve, M. Alexandra (Department: 1725)
Electric heating
Metal heating
By arc
C219S121600
Reexamination Certificate
active
11538842
ABSTRACT:
The invention provides a laser beam machine having a light path duct with improved dust proof property. A light path system1of a laser beam machine comprises a light path duct10having a U-shaped cross-section with the upper end opened, wherein the opening portion is covered by a steel belt30. The laser beam extraction unit50traveling on the light path duct10in the direction of arrow A elevates the steel belt30and extracts the laser beam from the light path duct10. The steel belt30has a guiding projection32disposed at the center thereof. The laser beam extraction unit50has a guide roller 64 disposed below the steel belt30and a guide roller62having a V-shaped groove62afor engaging the projection on the steel belt30, thereby preventing displacement of the steel belt.
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European Search Report for corresponding Application No. 06 40 5406 dated Mar. 20, 2007.
Miyakawa Naoomi
Yamazaki Tsunehiko
Elve M. Alexandra
Renner , Otto, Boisselle & Sklar, LLP
Yamazaki Mazak Corporation
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