Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1995-03-03
1998-02-10
Czaja, Donald E.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65 291, 65 2911, 65 2912, 65 2915, 65 2918, 65160, 65163, 65273, 65287, 65DIG13, C03B 23023, C03B 2303
Patent
active
057164258
ABSTRACT:
A closed loop control system for a hydraulically actuated glass sheet press bending platen. Flow of fluid supplied to the cylinder operating the press platen is controlled through a servo solenoid valve. A linear motion transducer associated with the platen and sends appropriate signals to a programmable motion controller. The motion controller controls a position module operatively coupled to a servo solenoid valve which regulates the flow of hydraulic fluid from a pump to the cylinder. The motion controller utilizes data from the linear motion transducer for making necessary corrections to insure that the platen cycles precisely in accordance with a predetermined program. In a second embodiment of the invention, the closed loop control system for the hydraulically operated platen is combined with a precision control of a variable speed glass sheet conveyor means for improved registry of the glass sheet being bent with the platen member.
REFERENCES:
patent: 4496386 (1985-01-01), Hymore et al.
patent: 5178660 (1993-01-01), Wampler et al.
Enk Allan T.
Revells Robert G.
Smith Gary A.
Wolfe Jennifer R.
Colaianni Michael P.
Czaja Donald E.
Libbey-Owens-Ford Co.
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