Patent US3780365A successfully refreshed from Google Patents.
US3780365A
Expired / Lapsed
US
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Digital method and system for material handling
Assignee: Pharmacia and Upjohn Co
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Filing: 1970-11-18
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Granted: 1973-12-18
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Expires: 1990-11-18
Abstract
Abstract Methods and apparatus are disclosed for controlling fluid flow in a flow system as a function of the rpm of a pump shaft and as a function of the mass transfer rate of another material. In one form of the invention, a pulse train is established having a frequency indicative of the rpm of the shaft of the pump. This frequency is compared with a preselected frequency, and any difference is translated into a functionally related number of error or correction pulses. The pump motor is provided with a stepper-type adjustment circuit which corrects the rpm of the motor and pump drive shaft in response to, and as a function of, the number of error pulses.
Inventors
- 👤 L Porter
- 👤 K Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:01
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/135; G05B; G05B21/00; G05B21/02; G05D11/131; G05D11/132; G05D7/00; G05D7/06; G05D7/0617; G05D7/0629; G05D7/0676; G05D7/0682; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/901; Y10S388/907; Y10S388/912
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
205 words
Apparatus for establishing and maintaining a preselected material flow, comprising: pump means having a rotatable input shaft, an electric motor having a rotatable output shaft interconnected to drive said pump input shaft, indicating means for generating pulses functionally related to the rotation of one of said shafts, period means for defining a succession of time increments each beginning with the termination of the immediately succeeding one of said increments, a pulse counter for receiving and counting pulses occurring during each of said time increments, a preset means for generating a functional representation of a preselected number of said pulses, a comparator interconnected with said pulse counter and preset means for generating a signal pulse indicating the receipt of said preselected number of said pulses by said pulse counter, anti-coincidence means responsive to said period means and comparator for deriving a measurement signal functionally related to any time difference between the termination of any time increment and the occurrence of a correlative signal pulse from said comparator, and an error counter responsive to said measurement signal for generating error pulses in number functionally related to the magnitude of said measurement signal, said anti-coincidence means further including means for providing a reset signal to said pulse counter.
Claim 2
Dependent Claim
205 words
Apparatus for establishing and maintaining a preselected material flow, comprising: pump means having a rotatable input shaft, an electric motor having a rotatable output shaft interconnected to drive said pump input shaft, indicating means for generating pulses functionally related to the rotation of one of said shafts, period means for defining a succession of time increments each beginning with the termination of the immediately succeeding one of said increments, a pulse counter for receiving and counting pulses occurring during each of said time increments, a preset means for generating a functional representation of a preselected number of said pulses, a comparator interconnected with said pulse counter and preset means for generating a signal pulse indicating the receipt of said preselected number of said pulses by said pulse counter, anti-coincidence means responsive to said period means and comparator for deriving a measurement signal functionally related to any time difference between the termination of any time increment and the occurrence of a correlative signal pulse from said comparator, and an error counter responsive to said measurement signal for generating error pulses in number functionally related to the magnitude of said measurement signal, said anti-coincidence means further including means for providing a reset signal to said pulse counter.
Claim 3
Dependent Claim
36 words
The apparatus described in claim 1, wherein said anti-coincidence means further provides an indication to said control means of priority as between the termination of a time increment and a correlative signal pulse from said comparator.
Claim 4
Dependent Claim
61 words
The apparatus described in claim 2, wherein said control means includes an adjustable controller means for generating a control voltage having a magnitude establishing the velocity of said motor, and stepper means interconnected with said controller means and responsive to said priority indication and said error pulses for varying said control voltage a preselected increment for each of said error pulses.
Claim 5
Dependent Claim
57 words
The apparatus described in claim 3, wherein said pulse counter receives and counts said rpm pulses occurring durIng said time increments defined by said period means, and wherein said measurement signal from anti-coincidence means is functionally related to any difference between the actual rpm of said motor output shaft during said time increments and a preselected rpm.
Claim 6
Dependent Claim
43 words
The apparatus described in claim 4, wherein said period means includes a clock generator for generating a preselected frequency of timing pulses, and a period pulse generator for generating a period pulse upon the occurrence of a preselected number of said timing pulses.
Claim 7
Dependent Claim
33 words
The apparatus described in claim 5, wherein said measurement signal and priority indication are generated by said anti-coincidence means in response to correlative ones of said comparator signal pulse and said period pulse.
Claim 8
Dependent Claim
54 words
The apparatus described in claim 3, wherein said indicating means includes frequency conversion means responsive to said rpm pulses for generating a train of first output pulses functionally related to units of mass transfer by said pump means, and wherein said pulse counter receives and counts said first output pulses from said conversion means.
Claim 9
Dependent Claim
59 words
The apparatus described in claim 7, wherein said period means includes a frequency source generating a train of second output pulses functionally related to units of mass transfer by another different pump means, and a period pulse generator for generating a period pulse upon the occurrence of a preselected number of said second output pulses from said frequency source.
Claim 10
Dependent Claim
171 words
Apparatus for establishing and maintaining a preselected shaft speed for a motor comprising master frequency means for generating a train of period pulses, generating means responsive to the rotation of said shaft for generating electrical pulses functionally related to the speed of said shaft rotation, a period counter for defining said first time period as a function of the occurrence of a predetermined number of said period pulses, comparing means for defining a second time period as a function of the occurrence of a preselected number of said electrical pulses, anti-coincidence means interconnected between said period counter and said comparing means for providing an actuating signal during the occurrence of any difference between every successive first and second time periods, electrical gate means having inputs from said anti-coincidence means and said generator means for receiving and passing electrical pulses during the occurrence of said actuating signal, and adjusting means for controlling the speed of said motor as a function of the number of said electrical pulses passed by said gate means.
Claim 11
Dependent Claim
171 words
Apparatus for establishing and maintaining a preselected shaft speed for a motor comprising master frequency means for generating a train of period pulses, generating means responsive to the rotation of said shaft for generating electrical pulses functionally related to the speed of said shaft rotation, a period counter for defining said first time period as a function of the occurrence of a predetermined number of said period pulses, comparing means for defining a second time period as a function of the occurrence of a preselected number of said electrical pulses, anti-coincidence means interconnected between said period counter and said comparing means for providing an actuating signal during the occurrence of any difference between every successive first and second time periods, electrical gate means having inputs from said anti-coincidence means and said generator means for receiving and passing electrical pulses during the occurrence of said actuating signal, and adjusting means for controlling the speed of said motor as a function of the number of said electrical pulses passed by said gate means.
Claim 12
Dependent Claim
15 words
The apparatus of claim 9 wherein said means for supplying pulses includes a clock oscillator.
Claim 13
Dependent Claim
39 words
The apparatus of claim 9 wherein said means for supplying pulses includes a second motor means having a second rotatable shaft, and means responsive to the rotation of said second output shaft for supplying pulses to said period counter.
Claim 14
Dependent Claim
45 words
The apparatus described in claim 9, wherein said adjusting means comprises means for multiplying the number of electrical pulses passed by said gate means by a factor functionally related to the time base of the frequency of said electrical pulses generated by said generating means.
Claim 15
Independent Claim
204 words
A system for regulating the shaft velocity of a motor, comprising a first pulse source for providing a train of measurement pulses each functionally related to a preselected increment of shaft rotation, a second pulse source for providing a train of period pulses, a first counting means for receiving and accumulating measurement pulses from said first pulse source, preset means for causing said first counting means to generate a first actuating signal upon receiving a predetermined number of said measurement pulses from said first source, a second counting means for receiving period pulses from said second pulse source and for generating a second actuating signal uPon receiving and accumulating a predetermined number of said period pulses, comparing means for generating a gating signal commencing with the occurrence of the earlier of said two actuating signals and terminating with the occurrence of the later of said two actuating signals, gate means for passing measurement pulses generated by said first pulse source during the continuance of said gating signal, and adjustment means for incrementally altering the shaft velocity of said motor as a function of the number of measurements pulses traversing said gate, said first counting means being reset upon the discontinuance of said gating signal.
Claim 16
Independent Claim
204 words
A system for regulating the shaft velocity of a motor, comprising a first pulse source for providing a train of measurement pulses each functionally related to a preselected increment of shaft rotation, a second pulse source for providing a train of period pulses, a first counting means for receiving and accumulating measurement pulses from said first pulse source, preset means for causing said first counting means to generate a first actuating signal upon receiving a predetermined number of said measurement pulses from said first source, a second counting means for receiving period pulses from said second pulse source and for generating a second actuating signal uPon receiving and accumulating a predetermined number of said period pulses, comparing means for generating a gating signal commencing with the occurrence of the earlier of said two actuating signals and terminating with the occurrence of the later of said two actuating signals, gate means for passing measurement pulses generated by said first pulse source during the continuance of said gating signal, and adjustment means for incrementally altering the shaft velocity of said motor as a function of the number of measurements pulses traversing said gate, said first counting means being reset upon the discontinuance of said gating signal.
Claim 17
Independent Claim
281 words
A system for regulating the shaft velocity of a first motor as a function of the shaft velocity of a second motor, comprising a first pulse source for providing a train of data pulses each functionally related to a preselected increment of rotation of the shaft of said first motor, a second pulse source for providing a train of period pulses each functionally related to a preselected increment of rotation of the shaft of said second motor, a ratio counter for receiving and accumulating data pulses from said first pulse source, preset means for causing said ratio counter to generate a first actuating signal when said ratio counter accumulates a preselected total number of said data pulses, a period counter for receiving and accumulating period pulses from said second pulse source and for generating a second actuating signal when said period counter has accumulated a preselected total number of said period pulses, anti-coincidence means responsive to said period and ratio counters for generating a gating signal during the error time interval beginning with the first occurrence of one of said two actuating signals and ending with the occurrence of the other of said two actuating signals, error counting means responsive to said gating signal for receiving and accumulating data pulses during said error time interval, multipying means responsive to said error counting means and said second pulse source for generating correction pulses functionally related in number to the number of data pulses accumulated by said error counting means during said error time interval, and adjustment means for altering the shaft velocity of said first motor by increments functionally corresponding to the number of said correction pulses generated by said multiplying means.
Claim 18
Independent Claim
281 words
A system for regulating the shaft velocity of a first motor as a function of the shaft velocity of a second motor, comprising a first pulse source for providing a train of data pulses each functionally related to a preselected increment of rotation of the shaft of said first motor, a second pulse source for providing a train of period pulses each functionally related to a preselected increment of rotation of the shaft of said second motor, a ratio counter for receiving and accumulating data pulses from said first pulse source, preset means for causing said ratio counter to generate a first actuating signal when said ratio counter accumulates a preselected total number of said data pulses, a period counter for receiving and accumulating period pulses from said second pulse source and for generating a second actuating signal when said period counter has accumulated a preselected total number of said period pulses, anti-coincidence means responsive to said period and ratio counters for generating a gating signal during the error time interval beginning with the first occurrence of one of said two actuating signals and ending with the occurrence of the other of said two actuating signals, error counting means responsive to said gating signal for receiving and accumulating data pulses during said error time interval, multipying means responsive to said error counting means and said second pulse source for generating correction pulses functionally related in number to the number of data pulses accumulated by said error counting means during said error time interval, and adjustment means for altering the shaft velocity of said first motor by increments functionally corresponding to the number of said correction pulses generated by said multiplying means.
Claim 19
Dependent Claim
38 words
The system described in claim 14, wherein said anti-coincidence means also generates a polarity control signal indicating the earlier occurring of said two actuating signals, and wherein said adjustment means is also responsive to said polarity control signal.
Claim 20
Dependent Claim
100 words
The system described in claim 15, wherein said multiplying means further includes sampling means for establishing a factor corresponding to a function of the ratio of the time base of the frequency of said period pulses to the sample interval during which said preselected number of period pulses is accumulated by said period counter, and correction means for causing said adjustment means to alter said shaft velocity of said first motor by a number of increments corresponding to the product of said factor and said number of data pulses accumulated by said error counting means during said error time interval.
Claim 21
Dependent Claim
63 words
The multiplying means described in claim 16, wherein said sampling means further comprises a sampling clock adapted to generate a gating signal of preselected duration, a gate circuit openable in response to said gating signal from said sampling clock to pass period pulses from said second pulse source, and adjustment counting means for accumulating pulses from said gate circuit during said gating signal.
Claim 22
Dependent Claim
103 words
The multiplying means described in claim 27, wherein said correction means further comprises a stepper oscillator for generating a train of oscillator pulses into said adjustment counting means, a divIder circuit responsive to said stepper oscillator, and means interconnected with said divider circuit for applying said oscillator pulses to said divider circuit at a number functionally related to the product of the number of data pulses in said error counting means and the ratio of the time base of the frequency of said period pulses to the sample interval during which said preselected number of period pulses is accumulated by said period counter.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |