Off-angle balance correction method and apparatus

Claim 2

In balancing a rotary workpiece, a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations and is offset from a reference position midway between the correction locations comprising determining the amount and the position of unbalance of the workpiece and proDucing an unbalance signal representing the amount of unbalance, orienting the workpiece to a correction position with its position of unbalance between the correction locations, measuring the angle of offset between the reference position and the position of unbalance and producing an off-angle signal representing the amount of angular offset, deriving from the off-angle signal and the unbalance signal a compensation signal proportional to the product of the amount of unbalance and the angle of offset, adding the compensation signal to the unbalance signal to obtain a value representing the amount of balance correction required at the correction location nearest the position of unbalance and subtracting the compensation signal from the unbalance signal to obtain the amount of balance correction required at the other correction location.

Claim 3

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations and is offset from a reference position midway between the correction locations comprising determining the amount and the position of unbalance of the workpiece and producing an unbalance signal representing the amount of unbalance, orienting the workpiece to a correction position with its position of unbalance midway between the correction locations, angularly displacing the workpiece to a preferred position for correction, and producing an off-angle signal representing the angle of displacement, multiplying the off-angle signal and the unbalance signal and operating on the product to obtain a compensation factor which is proportional to the angle of displacement and the amount of unbalance adding the compensation factor to the amount of unbalance to obtain a value representing the amount of balance correction required at the correction location nearest the position of unbalance and subtracting the compensation factor from the amount of unbalance to obtain the amount of balance correction required at the other correction location.

Claim 4

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations and is offset from a reference position midway between the correction locations comprising determining the amount and the position of unbalance of the workpiece and producing an unbalance signal representing the amount of unbalance, orienting the workpiece to a correction position with its position of unbalance midway between the correction locations, angularly displacing the workpiece to a preferred position for correction, and producing an off-angle signal representing the angle of displacement, multiplying the off-angle signal and the unbalance signal and operating on the product to obtain a compensation factor which is proportional to the angle of displacement and the amount of unbalance adding the compensation factor to the amount of unbalance to obtain a value representing the amount of balance correction required at the correction location nearest the position of unbalance and subtracting the compensation factor from the amount of unbalance to obtain the amount of balance correction required at the other correction location.

Claim 5

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations and is offset from a reference position midway between the correction locations comprising measuring the amount and the angle of unbalance of the workpiece and producing an unbalance signal representing the amount of unbalance orienting the workpiece with its position of unbalance between the correction locations measuring the angle of offset between the reference position and the position of unbalance to produce an AC signal having a phase relative to a reference signal proportional to the angle of offset, multiplying the AC signal by the unbalance signal and phase rectifying the product to produce an offset signal operating on the offset signal to produce positive and negative compensation signals having equal magnitude proportional to the offset signal and combining the amount of unbalance with the positive and negative compensation signals to obtain the amount of correction required at each correction location.

Claim 6

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations and is offset from a reference position midway between the correction locations comprising measuring the amount and the angle of unbalance of the workpiece and producing an unbalance signal representing the amount of unbalance orienting the workpiece with its position of unbalance between the correction locations measuring the angle of offset between the reference position and the position of unbalance to produce an AC signal having a phase relative to a reference signal proportional to the angle of offset, multiplying the AC signal by the unbalance signal and phase rectifying the product to produce an offset signal operating on the offset signal to produce positive and negative compensation signals having equal magnitude proportional to the offset signal and combining the amount of unbalance with the positive and negative compensation signals to obtain the amount of correction required at each correction location.

Claim 7

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations comprising producing a first signal proportional to the magnitude of unbalance, producing a second signal as a function of the angle of unbalance, moving the workpiece in response to the second signal to locate the angular position of unbalance equidistant between a pair of spaced correction locations, angularly offsetting the workpiece to a new location and producing a third signal having a phase dependent on the amount of offset and the direction of offset, multiplying the first and third signals to produce a fourth signal, establishing an amount of balance correction for one of the correction locations dependent on the first signal modified by adding a function of the fourth signal, and establishing an amount of balance correction for the other of the correction locations dependent on the first signal modified by subtracting a function of the fourth signal.

Claim 8

In balancing a rotary workpiece a method of determining the amount of balance correction required at each of a pair of angularly spaced correction locations wherein the position of unbalance is between the correction locations comprising producing a first signal proportional to the magnitude of unbalance, producing a second signal as a function of the angle of unbalance, moving the workpiece in response to the second signal to locate the angular position of unbalance equidistant between a pair of spaced correction locations, angularly offsetting the workpiece to a new location and producing a third signal having a phase dependent on the amount of offset and the direction of offset, multiplying the first and third signals to produce a fourth signal, establishing an amount of balance correction for one of the correction locations dependent on the first signal modified by adding a function of the fourth signal, and establishing an amount of balance correction for the other of the correction locations dependent on the first signal modified by subtracting a function of the fourth signal.

Claim 9

In a balance measuring apparatus, means for measuring the amount and angular position of unbalance in a rotating body, means for determining the amount of unbalance corrections required at a pair of given angularly spaced correction locations on the periphery of the body when there is an angular displacement between the position of unbalance and a point midway between the correction locations comprising means for producing an unbalance signal representing the amount of unbalance, means for producing an off-angle signal representing the said angular displacement, means for deriving from the off-angle signal and the unbalance signal a compensating signal proportional to the product of the amount of unbalance and the angular displacement, means for adding the unbalance signal and the compensating signal to obtain a signal proportional to the correction required at the correction location nearest the position of unbalance, and means for subtracting the compensating signal from the unbalance signal to obtain a signal proportional to the correction required at the correction location furthest from the position of unbalance.

Claim 10

In a balance measuring apparatus, means for measuring the amount and angular position of unbalance in a rotating body, means for determining the amount of unbalance corrections required at a pair of given angularly spaced correction locations on the periphery of the body when there is an angular displacement between the position of unbalance and a point midway between the correction locations comprising means for producing an unbalance signal representing the amount of unbalance, means for producing an off-angle signal representing the said angular displacement, means for deriving from the off-angle signal and the unbalance signal a compensating signal proportional to the product of the amount of unbalance and the angular displacement, means for adding the unbalance signal and the compensating signal to obtain a signal proportional to the correction required at the correction location nearest the position of unbalance, and means for subtracting the compensating signal from the unbalance signal to obtain a signal proportional to the correction required at the correction location furthest from the position of unbalance.

Claim 11

In a balance measuring apparatus, means for measuring the amount and angular position of unbalance in a rotating body, means for determining the amount of unbalance corrections required at a pair of given angularly spaced correction locations on the periphery of the body when there is an angular displacement between the position of unbalance and a point midway between the correction locations comprising means for producing an unbalance signal proportional to the amount of unbalance, means for producing an off-angle AC signal having a phase dependent on the angular displacement, means for multiplying the signals to provide a product, phase sensitive rectifying means for operating on the product to derive a compensating signal which is a linear function of the angular displacement and of the amount of unbalance, amplifier means responsive to the compensating signal to produce a pair of equal magnitude signals of opposite sense, and circuit means for combining the unbalance signal with each of the pairs of signals to produce outputs representing the amount of correction required at the correction locations.

Claim 12

In a balance measuring apparatus, means for measuring the amount and angular position of unbalance in a rotating body, means for determining the amount of unbalance corrections required at a pair of given angularly spaced correction locations on the periphery of the body when there is an angular displacement between the position of unbalance and a point midway between the correction locations comprising means for producing an unbalance signal proportional to the amount of unbalance, means for producing an off-angle AC signal having a phase dependent on the angular displacement, means for multiplying the signals to provide a product, phase sensitive rectifying means for operating on the product to derive a compensating signal which is a linear function of the angular displacement and of the amount of unbalance, amplifier means responsive to the compensating signal to produce a pair of equal magnitude signals of opposite sense, and circuit means for combining the unbalance signal with each of the pairs of signals to produce outputs representing the amount of correction required at the correction locations.