US5051913A — Synchronous operation control system for numerica…

Claim 1

Independent Claim 122 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; first and second encoders coupled respectively to said master and slave shafts; processing means for differentiating output signals from said first and second encoders with respect to time and thereafter calculating at least positional errors between said master, slave, and workpiece shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 2

Dependent Claim 122 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; first and second encoders coupled respectively to said master and slave shafts; processing means for differentiating output signals from said first and second encoders with respect to time and thereafter calculating at least positional errors between said master, slave, and workpiece shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 3

Dependent Claim 157 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; a traverse shaft for moving said slave shaft and said workpiece shaft in unison with each other in a traverse direction; a third motor operatively coupled to said traverse shaft; first, second, and third encoders coupled respectively to said master, slave shafts, and traverse shafts; processing means for differentiating output signals from said first, second, and third encoders with respect to time and thereafter calculating at least positional errors between said master, slave, workpiece, and traverse shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 4

Dependent Claim 157 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; a traverse shaft for moving said slave shaft and said workpiece shaft in unison with each other in a traverse direction; a third motor operatively coupled to said traverse shaft; first, second, and third encoders coupled respectively to said master, slave shafts, and traverse shafts; processing means for differentiating output signals from said first, second, and third encoders with respect to time and thereafter calculating at least positional errors between said master, slave, workpiece, and traverse shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 5

Dependent Claim 59 words

The synchronous operation control system according to claim 1 or 2, wherein said processing means comprises means for multiplying an output signal from each of said encoders by a multiplier, one of said encoders having a lower resolution than another of said encoders and thereafter comparing the multiplied output signals to calculate a difference therebetween as the positional error.

Claim 6

Dependent Claim 54 words

The synchronous operation control system according to claim 3, further comprising a feed shaft for moving said slave shaft and said workpiece shaft, and a servo drive source operatively coupled to said feed shaft for moving the feed shaft to allow said tool to machine said workpiece in a direction along said feed shaft.

Claim 7

Dependent Claim 126 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; first, second, and third encoders coupled respectively to said master, slave shafts, and workpiece shafts; processing means for differentiating output signals from said first, second, and third encoders with respect to time and thereafter calculating at least positional errors between said master, slave, and workpiece shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 8

Dependent Claim 126 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; first, second, and third encoders coupled respectively to said master, slave shafts, and workpiece shafts; processing means for differentiating output signals from said first, second, and third encoders with respect to time and thereafter calculating at least positional errors between said master, slave, and workpiece shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 9

Dependent Claim 160 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; a traverse shaft for moving said slave shaft and said workpiece shaft in unison with each other in a traverse direction; a third motor operatively coupled to said traverse shaft; first, second, third, and fourth encoders coupled respectively to said master, slave shafts, workpiece, and traverse shafts; processing means for differentiating output signals from said first, second, third, and fourth encoders with respect to time and thereafter calculating at least positional errors between said master, slave, workpiece, and traverse shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 10

Dependent Claim 160 words

A synchronous operation control system for a numerically controlled machine, comprising: a master shaft with a tool mounted thereon; a first motor for rotating said master shaft; a slave shaft; a second motor for rotating said slave shaft; a workpiece shaft operatively coupled to said slave shaft for supporting a workpiece which is to be machined by said tool; a traverse shaft for moving said slave shaft and said workpiece shaft in unison with each other in a traverse direction; a third motor operatively coupled to said traverse shaft; first, second, third, and fourth encoders coupled respectively to said master, slave shafts, workpiece, and traverse shafts; processing means for differentiating output signals from said first, second, third, and fourth encoders with respect to time and thereafter calculating at least positional errors between said master, slave, workpiece, and traverse shafts; and means for adding and subtracting output signals from said processing means and applying an output signal to said second motor.

Claim 11

Dependent Claim 59 words

The synchronous operation control system according to claim 5 or 6, wherein said processing means comprises means for multiplying an output signal from each of said encoders by a multiplier, one of said encoders having a lower resolution than another of said encoders, and thereafter comparing the multiplied output signals to calculate a difference therebetween as the positional error.

Claim 12

Dependent Claim 54 words

The synchronous operation control system according to claim 7, further comprising a feed shaft for moving said slave shaft and said workpiece shaft, and a servo drive source operatively coupled to said feed shaft for moving the feed shaft to allow said tool to machine said workpiece in a direction along said feed shaft.

Claim 13

Dependent Claim 58 words

The synchronous operation control system according to claim 1, 2, 5 or 6, further comprising a feed shaft for moving said slave shaft and said workpiece shaft, and a servo drive source operatively coupled to said feed shaft for moving the feed shaft to allow said tool to machine said workpiece in a direction along said feed shaft.

Claim 14

Dependent Claim 17 words

The synchronous operation control system according to claim 9, wherein said servo drive source comprises a servomotor.

Claim 15

Dependent Claim 155 words

The synchronous operation control system for a numerically controlled machine, comprising: servo drive source means for moving a workpiece with respect to a tool; first multiplier means for multiplying by a predetermined multiplier data indicative of a moving distance to be transversed by said servo drive source means; first accumulator means for temporarily storing an output signal from said first multiplier means; position detector means coupled to said servo drive source means; counter means for counting pulses from said position detector means; second multiplier means for multiplying by a predetermined multiplier an output signal from said counter means; second accumulator means for temporarily storing an output signal from said second multiplier means; error counter means for calculating a difference between output signals which are applied from said first and second accumulator means in synchronism with a sampling signal, and for applying an output signal to said servo drive source means to move said workpiece smoothly.

Claim 16

Dependent Claim 155 words

The synchronous operation control system for a numerically controlled machine, comprising: servo drive source means for moving a workpiece with respect to a tool; first multiplier means for multiplying by a predetermined multiplier data indicative of a moving distance to be transversed by said servo drive source means; first accumulator means for temporarily storing an output signal from said first multiplier means; position detector means coupled to said servo drive source means; counter means for counting pulses from said position detector means; second multiplier means for multiplying by a predetermined multiplier an output signal from said counter means; second accumulator means for temporarily storing an output signal from said second multiplier means; error counter means for calculating a difference between output signals which are applied from said first and second accumulator means in synchronism with a sampling signal, and for applying an output signal to said servo drive source means to move said workpiece smoothly.

Claim 17

Dependent Claim 36 words

The synchronous operation control system according to claim 11, wherein each of said first and second multiplier means multiplies the output signal by a number which is equal to the number of sampling cycles per unit.

Claim 18

Dependent Claim 19 words

The synchronous operation control system according to claim 11 or 12, wherein said servo drive source comprises a servometer.

Claim 19

Dependent Claim 24 words

The synchronous operation control system according to claim 1, 2, 5, 6, 11 or 9, wherein each of said encoders comprises a pulse generator.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-09-23	1995-03-25	1995-09-24	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-09-23	1999-03-25	1999-09-24	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-09-23	2003-03-25	2003-09-24	$7700.00	Window Closed / Lapsed

Synchronous operation control system for numerically controlled machine

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