Working a natural or synthetic hard stone such as a gemstone

Details Working a natural or synthetic hard stone such as a gemstone Working a natural or synthetic hard stone such as a gemstone

1997-05-05

1998-05-05

Rose, Robert A.

Abrading

Precision device or process - or with condition responsive...

With feeding of tool or work holder

451 41, 451389, B24B 4900

Patent

active

057466459

ABSTRACT:
For blocking or polishing a natural or synthetic stone having a Mohs hardness greater than about 5, a blocking head has a body, a mounting member which can move vertically with respect to the body, and a rotary spindle driven by a motor. The mounting member is carried by a leaf spring whose position is altered by a parallel linkage whose arm is driven by a motor. In this way, the spring can for soft landing apply an upwards bias opposing the gravitational force of the mass of the mounting member. When the stone is in contact with the scaife, the deflection of the spring measures the force on the stone, and this deflection is detected by an LVDT. Subsequently, the spring can apply a downwards bias to augment the working force. A microprocessor is responsive to the output of the LVDT and controls the motor so that the force applied to the stone complies with a predetermined program.

REFERENCES:
patent: 2534384 (1950-12-01), Spira
patent: 3109268 (1963-11-01), Printz
patent: 3110136 (1963-11-01), Spira
patent: 3704555 (1972-12-01), Millett
patent: 4085547 (1978-04-01), Lawson et al.
patent: 4348838 (1982-09-01), Tacchella
patent: 4603512 (1986-08-01), Cave et al.
patent: 4653361 (1987-03-01), Zobeli
patent: 4669300 (1987-06-01), Hall et al.
Patent Abstract of Japan, vol. 017 No. 395, (M-1451) 23 Juillet 93 & JP-A-05 077127 (Takahiro Imahashi) 30 Mars 93.
Patent Abstract of Japan vol. 016 No. 391 (M-1298) 12 Aout 92 & JP-A-04 129657 (Takahiro Imahashi) 30 Avril 1992.

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