US3571685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Numerical servo displacement control system
Assignee: International Business Machines Corp
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Filing: 1968-01-15
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Granted: 1971-03-23
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Expires: 1988-01-15
Abstract
Abstract The physical displacement of a movable medium is indicated by the content of a bidirectional counter. The counter is incremented or decremented by direction-oriented pulses relating to movement of the medium, these pulses being selectively gated into the counter. The content of the counter can control an operational amplifier to provide an indication of the position of the medium relative to a null point represented by any selected count in the counter.
Inventors
- 👤 Vaughn E Akins
- 👤 John P Harris
- 👤 Frederick H Kost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:35
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/20; G11; G11B; G11B15/00; G11B15/02; G11B15/05; G11B15/093; G11B27/00; G11B27/10; G11B27/11; G11B27/13
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
279 words
A system operable with a movable strip-type medium comprising: 1. means for producing pulses indicative of direction of movement and displacement of said medium; 2. a bidirectional counter responsive to said pulses to meter displacement; 3. gating means for selectively coupling said pulses to said counter; 4. an operational amplifier; 5. converting means responsive to said counter for supplying an analogue signal indicative of the count in said counter to said operational amplifier; 6. means for biasing said amplifier with a signal of opposite polarity but of a magnitude representative of a predetermined count; 7. means for actuating said gating means such that said analogue signal is indicative of the physical displacement of the medium from a position corresponding to the magnitude of the signal from said biasing means; 8. moTive means including a motor for positioning said medium and connected to said amplifier for being actuated thereby; 9. deconditioning means for deconditioning said converter to actuate said motor at a speed proportional to the magnitude of the signal from said amplifier as caused by said biasing means and said motive means being controlled by the numerical contents of said counter whenever said converter means and said gating means are simultaneously actuated; 10. means operable with said deconditioning means for selectively forcing said converter means to supply a signal to said amplifier for causing said motive means to move in a direction opposite to that effected by the biasing means signal; 11. means for causing said counter to continue counting pulses after operation of said deconditioning means at least until said counter contains a preselected count; and 12. means for indicating that said preselected count is in said counter.
Claim 2
Independent Claim
279 words
A system operable with a movable strip-type medium comprising: 1. means for producing pulses indicative of direction of movement and displacement of said medium; 2. a bidirectional counter responsive to said pulses to meter displacement; 3. gating means for selectively coupling said pulses to said counter; 4. an operational amplifier; 5. converting means responsive to said counter for supplying an analogue signal indicative of the count in said counter to said operational amplifier; 6. means for biasing said amplifier with a signal of opposite polarity but of a magnitude representative of a predetermined count; 7. means for actuating said gating means such that said analogue signal is indicative of the physical displacement of the medium from a position corresponding to the magnitude of the signal from said biasing means; 8. moTive means including a motor for positioning said medium and connected to said amplifier for being actuated thereby; 9. deconditioning means for deconditioning said converter to actuate said motor at a speed proportional to the magnitude of the signal from said amplifier as caused by said biasing means and said motive means being controlled by the numerical contents of said counter whenever said converter means and said gating means are simultaneously actuated; 10. means operable with said deconditioning means for selectively forcing said converter means to supply a signal to said amplifier for causing said motive means to move in a direction opposite to that effected by the biasing means signal; 11. means for causing said counter to continue counting pulses after operation of said deconditioning means at least until said counter contains a preselected count; and 12. means for indicating that said preselected count is in said counter.
Claim 3
Dependent Claim
10 words
a bidirectional counter responsive to said pulses to meter displacement;
Claim 4
Dependent Claim
10 words
a bidirectional counter responsive to said pulses to meter displacement;
Claim 5
Dependent Claim
10 words
a bidirectional counter responsive to said pulses to meter displacement;
Claim 6
Dependent Claim
10 words
a bidirectional counter responsive to said pulses to meter displacement;
Claim 7
Dependent Claim
70 words
Apparatus in accordance with claim 1 wherein: said preselected count is either a full count or a zero count in said counter, and which further includes means responsive to said indicating means for causing a full count to be placed in said counter whenever a zero count is indicated as present therein and for placing a zero count in said counter whenever a full count is indicated as present therein.
Claim 8
Dependent Claim
48 words
logic coupling means interposed between said counter, said motive means including biasing means for supplying a signal indicative of a predetermined count in said counter but of opposite sign and operative to supply an analogue signal indicative of the count in the counter for actuating said motive means;
Claim 9
Dependent Claim
48 words
logic coupling means interposed between said counter, said motive means including biasing means for supplying a signal indicative of a predetermined count in said counter but of opposite sign and operative to supply an analogue signal indicative of the count in the counter for actuating said motive means;
Claim 10
Dependent Claim
56 words
Apparatus in accordance with claim 2 which further includes: means responsive to an output from said indicating means for deconditioning said gating means, said gating means and said logic coupling means being reconditioned whenever said motor is to be brought to a stop at a displacement position corresponding to the signal introduced by said biasing means.
Claim 11
Dependent Claim
10 words
gating means for selectively coupling said pulses to said counter;
Claim 12
Dependent Claim
10 words
gating means for selectively coupling said pulses to said counter;
Claim 13
Dependent Claim
8 words
A tape motion control system, including the combination:
Claim 14
Dependent Claim
8 words
A tape motion control system, including the combination:
Claim 15
Dependent Claim
80 words
control means including gating means for selectively passing pulses to said counter and simultaneously deconditioning said logic-coupling means such that said bias signal is supplied to said motor whenever said gating means are not actuated and when said gating means are actuated to supply said analogue signal indicative of said count to said motor in combination with said bias signal, such that said motor tends to move a given displacement in accordance with the magnitude of said bias signal; and
Claim 16
Dependent Claim
80 words
control means including gating means for selectively passing pulses to said counter and simultaneously deconditioning said logic-coupling means such that said bias signal is supplied to said motor whenever said gating means are not actuated and when said gating means are actuated to supply said analogue signal indicative of said count to said motor in combination with said bias signal, such that said motor tends to move a given displacement in accordance with the magnitude of said bias signal; and
Claim 17
Dependent Claim
3 words
an operational amplifier;
Claim 18
Dependent Claim
3 words
an operational amplifier;
Claim 19
Dependent Claim
22 words
converting means responsive to said counter for supplying an analogue signal indicative of the count in said counter to said operational amplifier;
Claim 20
Dependent Claim
22 words
converting means responsive to said counter for supplying an analogue signal indicative of the count in said counter to said operational amplifier;
Claim 21
Dependent Claim
24 words
further means for causing said counter to accept pulses for counting after operation of said control means until said counter contains a preselected count.
Claim 22
Dependent Claim
24 words
further means for causing said counter to accept pulses for counting after operation of said control means until said counter contains a preselected count.
Claim 23
Dependent Claim
20 words
means for biasing said amplifier with a signal of opposite polarity but of a magnitude representative of a predetermined count;
Claim 24
Dependent Claim
20 words
means for biasing said amplifier with a signal of opposite polarity but of a magnitude representative of a predetermined count;
Claim 25
Dependent Claim
34 words
means for actuating said gating means such that said analogue signal is indicative of the physical displacement of the medium from a position corresponding to the magnitude of the signal from said biasing means;
Claim 26
Dependent Claim
34 words
means for actuating said gating means such that said analogue signal is indicative of the physical displacement of the medium from a position corresponding to the magnitude of the signal from said biasing means;
Claim 27
Dependent Claim
18 words
moTive means including a motor for positioning said medium and connected to said amplifier for being actuated thereby;
Claim 28
Dependent Claim
18 words
moTive means including a motor for positioning said medium and connected to said amplifier for being actuated thereby;
Claim 29
Dependent Claim
53 words
deconditioning means for deconditioning said converter to actuate said motor at a speed proportional to the magnitude of the signal from said amplifier as caused by said biasing means and said motive means being controlled by the numerical contents of said counter whenever said converter means and said gating means are simultaneously actuated;
Claim 30
Dependent Claim
53 words
deconditioning means for deconditioning said converter to actuate said motor at a speed proportional to the magnitude of the signal from said amplifier as caused by said biasing means and said motive means being controlled by the numerical contents of said counter whenever said converter means and said gating means are simultaneously actuated;
Claim 31
Dependent Claim
38 words
means operable with said deconditioning means for selectively forcing said converter means to supply a signal to said amplifier for causing said motive means to move in a direction opposite to that effected by the biasing means signal;
Claim 32
Dependent Claim
38 words
means operable with said deconditioning means for selectively forcing said converter means to supply a signal to said amplifier for causing said motive means to move in a direction opposite to that effected by the biasing means signal;
Claim 33
Dependent Claim
25 words
means for causing said counter to continue counting pulses after operation of said deconditioning means at least until said counter contains a preselected count; and
Claim 34
Dependent Claim
25 words
means for causing said counter to continue counting pulses after operation of said deconditioning means at least until said counter contains a preselected count; and
Claim 35
Dependent Claim
11 words
means for indicating that said preselected count is in said counter.
Claim 36
Dependent Claim
11 words
means for indicating that said preselected count is in said counter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |