Metal deforming – With use of optical or transparent means
Patent
1994-08-18
1996-07-02
Jones, David
Metal deforming
With use of optical or transparent means
72 3101, 72 72, 723893, B21C 5100, B21B 3714, B30B 1526
Patent
active
055310877
ABSTRACT:
A metal sheet bending machine for bending a metal sheet inserted between an upper bender and lower bender to a desired angle. While the metal sheet is being bent to the desired angle, a linear image of projected measuring light, which rotates with a change in the bending angle of the metal sheet, is formed by a measuring light source on an outer face of the bent metal sheet and sequentially photographed and stored. Based on the stored images, the bending angle of the metal sheet is calculated. Based on the result of the calculation, the positions of tile upper and/or lower benders are controlled whereby the metal sheet can be bent to the desired angle. The bending angle of the metal sheet may be obtained based on the rotating angle of the linear image of projected measuring light formed on the photographed images, or based on an angle formed by the linear image of projected measuring light and a linear image of projected reference light formed by a reference light source for projecting light onto the outer face of the metal sheet while the metal sheet is being bent to the desired angle so as to form the linear image at a desired fixed angle irrespective of the bending angle.
REFERENCES:
patent: 4430879 (1984-02-01), Rolland
patent: 4564765 (1986-01-01), Blaich
patent: 4770523 (1988-09-01), Yamada
patent: 5196900 (1993-03-01), Pettersen
patent: 5367902 (1994-11-01), Kitabayashi et al.
Kamada Ikuo
Kitabayashi Hiroyuki
Kuroda Yoshiaki
Ooenoki Toshiyuki
Butler Rodney
Jones David
Kabushiki Kaisha Komatsu Seisakusho
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