US3790876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper cutting machine
Assignee: Boeing North American Inc
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Filing: 1973-02-15
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Granted: 1974-02-05
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Expires: 1993-02-15
Abstract
Abstract An improved paper cutting machine is provided with a novel servo control system for repeatedly, precisely positioning the machine movable backgauge assembly at different intermediate positions in its total length of traverse. The control system utilizes conventional command signals and also feedback signals which provide binary-coded position information associated only with key control positions established at selected intervals in the backgauge total traverse and pulsed counting information for incremental position changes in each interval between the key control positions.
Inventors
- 👤 R Vail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:46
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/39; G05B19/42; G05B19/425; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37183; G05B2219/37297; G05B2219/41; G05B2219/41092; G05B2219/45; G05B2219/45044; G05B2219/49; G05B2219/49134; G05B2219/50; G05B2219/50289
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
285 words
In a machine having a work positioning member moved by leadscrew means throughout a total length of positioning member traverse and cooperating closed-loop servo control means regulating movement of said leadscrew means in response to summation of a command signal and a concurrent positioning member position feedback signal, in combination: signal generator means mechanically coupled to said leadscrew means and producing in response to movement of said leadscrew a unique output binary-coded signal for each one of different precise key reference positions established in said positioning member length of traverse and an output pulse signal for each uniform incremental change of positioning member position intermediate said precise key reference positions adjacent each other; incremented/decremented digital resettable counter means receiving said incremental change pulse signals from said signal generator means and counting said pulse signals to produCe an output binary-coded signal corresponding in magnitude to the sum of said incremental change pulses received thereby subsequent to resetting; comparator means receiving one of said signal generator means unique binary-coded signals and said counter means output binary-coded signal when said positioning member is at one of said precise key reference positions and producing an output signal indicative of a difference in magnitude that exists therebetween; and compensation circuit means compensating said counter means in response to said comparator means output signal when said received unique binary-coded signal differs in magnitude from said counter means output binary-coded signal at said one positioning member precise key reference position and until zero difference exists between said received signal generator means unique binary-coded signal and said counter means output binary-coded signal, said digital counter means output binary-coded signal further comprising the concurrent feedback position signal of said machine closed-loop servo control means.
Claim 2
Dependent Claim
285 words
In a machine having a work positioning member moved by leadscrew means throughout a total length of positioning member traverse and cooperating closed-loop servo control means regulating movement of said leadscrew means in response to summation of a command signal and a concurrent positioning member position feedback signal, in combination: signal generator means mechanically coupled to said leadscrew means and producing in response to movement of said leadscrew a unique output binary-coded signal for each one of different precise key reference positions established in said positioning member length of traverse and an output pulse signal for each uniform incremental change of positioning member position intermediate said precise key reference positions adjacent each other; incremented/decremented digital resettable counter means receiving said incremental change pulse signals from said signal generator means and counting said pulse signals to produCe an output binary-coded signal corresponding in magnitude to the sum of said incremental change pulses received thereby subsequent to resetting; comparator means receiving one of said signal generator means unique binary-coded signals and said counter means output binary-coded signal when said positioning member is at one of said precise key reference positions and producing an output signal indicative of a difference in magnitude that exists therebetween; and compensation circuit means compensating said counter means in response to said comparator means output signal when said received unique binary-coded signal differs in magnitude from said counter means output binary-coded signal at said one positioning member precise key reference position and until zero difference exists between said received signal generator means unique binary-coded signal and said counter means output binary-coded signal, said digital counter means output binary-coded signal further comprising the concurrent feedback position signal of said machine closed-loop servo control means.
Claim 3
Dependent Claim
54 words
The invention defined by claim 1 wherein said digital counter means comprises flip-flop circuits cascaded in a sequence of groups from a least-significant bit group through a most-significant bit group and in a ripple counter configuration, said counter means output binary-coded signal being loaded into said comparator means from said most-significant bit group only.
Claim 4
Dependent Claim
123 words
The invention defined by claim 2 wherein said combination further comprises strobing circuit means producing a precision marking pulse only at each precise key reference position in said positioning member length of traverse and not at positioning member positions intermediate adjacent key reference positions, said strobing circuit means precision marking pulse resetting said digital counter means at all said flip-flop circuit significant bit groups other than said most-significant bit group and enabling incrementing compensation of said digital counter means flip-flop circuit most-significant bit group by said signal generator means output pulse signals when said comparator means produces an output signal indicative of a difference in magnitude between the said signal generator means received unique binary-coded signal and said counter means output binary-coded signal.
Claim 5
Dependent Claim
61 words
The invention defined by claim 3 wherein said strobing circuit means precision marking pulse also enables incrementing of said digital counter means flip-flop circuit most-significant bit group by said signal generator means incremental change output pulse signals only when the digital counter means cascaded flip-flop circuit significant bit group most adjacent said digital counter means flip-flop circuit most-significant group is filled.
Claim 6
Dependent Claim
240 words
In a method of minimizing the accumulation of error in a machine closed loop servo control system regulating the movement of a work positioning member throughout a total length of positioning member traverse by connected leadscrew means and in response to the summation of a binary-coded command signal and a concurrent positioning means binary-coded position feedback signal, the steps of: generating a unique binary-coded signal for each one of different precise key reference positions in said positioning member length of traverse; generating an incremental change pulse signal for each uniform change of positioning member position intermediate said precise key reference positions; counting said incremental change pulse signals during the time interval of positioning member movement intermediate successive of said precise key reference positions; converting said counted incremental change pulse signals to a binary-coded count signal corresponding a magnitude to the sum of said counted incremental change pulses; comparing said precise key reference position unique binary-coded signal and said binary-coded count signal and producing an output difference signal indicative of any difference in magnitude that Exists therebetween; utilizing said output difference signal to cause a changing of the count of said counted incremental change pulse signals and said binary-coded count signal until said binary-coded count signal corresponds to one of said precise key reference position unique binary-coded signal at each precise key reference position; and inputting said binary-coded count signal into said servo control system as said binary-coded position feedback signal.
Claim 7
Dependent Claim
240 words
In a method of minimizing the accumulation of error in a machine closed loop servo control system regulating the movement of a work positioning member throughout a total length of positioning member traverse by connected leadscrew means and in response to the summation of a binary-coded command signal and a concurrent positioning means binary-coded position feedback signal, the steps of: generating a unique binary-coded signal for each one of different precise key reference positions in said positioning member length of traverse; generating an incremental change pulse signal for each uniform change of positioning member position intermediate said precise key reference positions; counting said incremental change pulse signals during the time interval of positioning member movement intermediate successive of said precise key reference positions; converting said counted incremental change pulse signals to a binary-coded count signal corresponding a magnitude to the sum of said counted incremental change pulses; comparing said precise key reference position unique binary-coded signal and said binary-coded count signal and producing an output difference signal indicative of any difference in magnitude that Exists therebetween; utilizing said output difference signal to cause a changing of the count of said counted incremental change pulse signals and said binary-coded count signal until said binary-coded count signal corresponds to one of said precise key reference position unique binary-coded signal at each precise key reference position; and inputting said binary-coded count signal into said servo control system as said binary-coded position feedback signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |