Centrifugal casting machine
The present disclosure relates to a casting machine, more particularly a centrifugal casting machine. The machine utilizes a casting head which clamps a mold in place. 
The mold is maintained in position by virtue of air pressure which acts upon the pressure plate of the casting head. The casting cycle may be automatically set as desired and the air pressure may also be set so as to maintain a constant and uniform value during the casting cycle. The present invention relates to casting machines and more particularly to centrifugal casting machines. 
In its presently preferred form the invention relates to a centrifugal casting machine used in the production of articles of jewelry or components thereof. Casting machines are well known as are centrifugal casting machines. In the jewelry art centrifugal casting machines have been used; however there is need for a centrifugal casting machine which exhibits reduced vibration during operation as well as for one which maintains substantially constant and uniform clamping pressure on the mold. U.S. Pat. No. 2,618,031 granted Nov. 18, 1952 to Samuel Mazer discloses a centrifugal casting machine for use in the jewelry field. The patentee employs a system of weights, levers and rollers actuated by the centrifugal force generated by the rotation of the casting head during operation of the machine. This system serves to urge a clamp plate into clamping position. 
However, it will be recognized that the force exerted by such clamp plate upon the mold id dependent upon and proportional to the rotational speed of the casting head. Variations in rotational speed leads to changes in centrifugal force and, therefore, to variations in the clamping pressure upon the mold. Such varying pressure during the molding cycle can result in the production of an inferior cast article and frequently lessens the useful life of the mold. 
One object of the invention is the provision of a centrifugal casting machine which will maintain substantially constant and uniform clamping pressure on the mold during rotation of the casting head. Another object of the invention is the provision of a centrifugal casting machine in which the clamping pressure is distributed substantially equally over the surface of the mold. A further object of the invention is the provision of a centrifugal casting machine in which the mold can be readily clamped in place within the casting head and in which ready access to the cast article is provided when the casting cycle has been completed. Still another object of the invention is the provision of a centrifugal casting machine having automatic casting cycle controls. Yet another object of the invention is the provision of a centrifugal casting machine which exhibits a minimum of vibration during rotation of the casting head.
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