Spectacle lens edge grinding machine

Claim 2

A spectacle lens edge grinding machine, comprising: a machine frame; a support mounted on and movable relative to said machine frame; a grinding wheel mounted on said support; a template abutment mounted on said support; a support shaft for a spectecle lens and a template, said support shaft being fixedly mounted on said machine frame; with said support being movable toward and away from said support shaft; a spring arrangement operatively associated with said machine frame and said support for bringing the latter into a starting position; said spring arrangement, when viewed in the direction of movement of said support toward said support shaft, acting on that side of said support which is remote from said support shaft; and a tensioning device operatively associated with said machine frame and said support for effecting movement of the latter toward said support shaft; said tensioning device, when viewed in the direction of movement of said support toward said support shaft, acting on that side of said support which faces said support shaft; said tensioning device being actuatable, and the tensioning force thereof being regulatable to go beyond variation of pressure of engagement of the lens before beginning of grinding procedure to vary the pressure during such grinding procedure dependent upon the shape and the resulting edge thickness of the lens being ground in such grinding procedure, such variation of pressure engagement of tbe lens including less grinding pressure of engagement when grinding a thinner edge portion of the lens edge and greater grinding pressure when grinding a thicker edge portion of the lens.

Claim 3

A grinding machine according to claim 1, in which said tensioning device includes an electromagnetic clutch with a reel, and a tensioning member which is operatively associated with said support and said reel; with the length of said tensioning member being adjustable by means of said reel for effecting said regulation of the tensioning force of said tensioning device.

Claim 4

A grinding machine according to claim 2, in which said support is linearly movable and is guided horizontally; which includes intermediate supports which are mounted on and movable relative to said machine frame, and on which said support is freely movable parallel to said support shaft; and in which said tensioning member acts on one of said intermediate supports.

Claim 5

A grinding machine according to claim 3, in which said tensioning device includes a potentiometer for controlling said electromagnetic clutch.

Claim 6

A grinding machine according to claim 4, which includes means for detecting the movement of one of said support and said intermediate supports, and for transmitting the value thereof to said tensioning device.

Claim 7

A grinding machine according to claim 5, which includes a sensor operatively associated with one of said support and said intermediate supports for detecting changes in grinding pressure during grinding of the lens, said sensor being further associated with said tensioning device in such a way as to effect automatic adjustment thereof in response to detected changes in said grinding pressure.

Claim 8

A spectacle lens edge grinding machine, comprising: a machine frame; a support mounted on and movable relative to said machine frame; a grinding wheel fixedly mounted on said machine frame; a template abutment fixedly mounted on said machine frame; a support shaft for a spectacle lens and a template, said support shaft being fixedly mounted on said support; with said support being movable toward and away from said grinding wheel and said template abutment; a spring arrangement operatively associated with said machine frame and said support for bringing the latter into a starting position; said spring arrangement, when viewed in the direction of movement of said support toward said grinding wheel and said template abutment, acting on that side of said support which is remote from said grinding wheel and said template abutment; and a tensioning device operatively associated with said machine frame and said support for effecting movement of the latter toward said grinding wheel and said template abutment said tensioning device, when viewed in the direction of movement of said support toward said grinding wheel and said template abutment, acting on that side of said support which faces said grinding wheel and said template abutment; said tensioning device being actuatable, and the tensioning force thereof being regulatable to go beyond variation of pressure of engagement of the lens before beginning of grinding procedure to vary the pressure during such grinding procedure dependent upon the shape and the resulting edge thickness of the lens being ground in such grinding procedure, such variation of pressure of engagement of the lens including less grinding pressure of engagement when grinding a thinner edge portion of the lens edge and greater grinding pressure when grinding a thicker edge portion of the lens

Claim 9

A spectacle lens edge grinding machine, comprising: a machine frame; a support mounted on and movable relative to said machine frame; a grinding wheel fixedly mounted on said machine frame; a template abutment fixedly mounted on said machine frame; a support shaft for a spectacle lens and a template, said support shaft being fixedly mounted on said support; with said support being movable toward and away from said grinding wheel and said template abutment; a spring arrangement operatively associated with said machine frame and said support for bringing the latter into a starting position; said spring arrangement, when viewed in the direction of movement of said support toward said grinding wheel and said template abutment, acting on that side of said support which is remote from said grinding wheel and said template abutment; and a tensioning device operatively associated with said machine frame and said support for effecting movement of the latter toward said grinding wheel and said template abutment said tensioning device, when viewed in the direction of movement of said support toward said grinding wheel and said template abutment, acting on that side of said support which faces said grinding wheel and said template abutment; said tensioning device being actuatable, and the tensioning force thereof being regulatable to go beyond variation of pressure of engagement of the lens before beginning of grinding procedure to vary the pressure during such grinding procedure dependent upon the shape and the resulting edge thickness of the lens being ground in such grinding procedure, such variation of pressure of engagement of the lens including less grinding pressure of engagement when grinding a thinner edge portion of the lens edge and greater grinding pressure when grinding a thicker edge portion of the lens

Claim 10

A grinding machine according to claim 7, in which said tensioning device includes an electromagnetic clutch with a reel, and a tensioning member which is operatively associated with said support and said reel; with the length of said tensioning member being adjustable by means of said reel for effecting said regulation of the tensioning force of said tensioning device.

Claim 11

A grinding machine according to claim 8, in which said support is linearly movable and is guided horizontally; which includes intermediate supports which are mounted on and movable relative to said machine frame, and on which said support is freely movable parallel to said support shaft; and in which said tensioning member acts on one of said intermediate supports.

Claim 12

A grinding machine according to claim 9, in which said tensioning device includes a potentiometer for controlling said electromagnetic clutch.

Claim 13

A grinding machine according to claim 10, which includes means for detecting the movement of one of said support and said intermediate supports, and for transmitting the value thereof to said tensioning device.

Claim 14

A grinding machine according to claim 11, which includes a sensor associated with one of said support and said intermediate supports for dectecting changes in grinding pressure during grinding of the lens, said sensor being further associated with said tensioning device in such a way as to effect automatic adjustment thereof in response to detected changes in said grinding pressure.

Claim 15

A grinding machine according to claim 1, including control system circuitry having potentiometer means for obtaining voltage therefrom that decreases with decreasing spectacle lens diameter and accordingly applied to a setting device as a measurement for deflection movement of said support for reduction of spacing to the spectacle lens mid-point, said control system being determinative of grinding pressure value at an optimum for grinding advance.

Claim 16

A grinding machine according to claim 7, including control system circuitry having potentiometer means for obtaining voltage therefrom that decreases with decreasing spectacle lens diameter and accordingly applied to a setting device as a measurement for deflection movement of said support for reduction of spacing to the spectacle lens midpoint, said control system being determinative of grinding pressure value at an optimum for grinding advance.