Patent US3562619A successfully refreshed from Google Patents.
US3562619A
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A control system for selectively positioning an output member
Assignee: Mitsubishi Electric Corp
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Filing: 1968-12-18
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Granted: 1971-02-09
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Expires: 1988-12-18
Abstract
Abstract During movement of a machine table, pulses of fixed repetition frequency are counted to be converted to a phase angle which is, in turn, compared with a phase angle corresponding to the movement of the movable table until a difference between them reaches zero. The pulses are also counted by a position counter to decrease a digital value registered in it. As the counter decreases in value the table automatically switches its speed from a high to a moderate magnitude and then to a low speed when the counter clears the table stops at it command position. Also, after having reached a predetermined distance from the command position, the table can progressively decelerate in accordance with the value remaining in the counter.
Inventors
- 👤 Hisamoto Hyoguchi
- 👤 Taka-Aki Kanamori
- 👤 Yasutugu Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:19
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; G05B2219/00; G05B2219/30; G05B2219/41; G05B2219/41465; G05B2219/43; G05B2219/43139; G05B2219/43179; G05B2219/43183
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
In a locating device for locating a movable output member at a command position, the combination of a movable output member, positioning means for positioning said movable output member in accordance with a locating signal, analogue position detector means for detecting a magnitude of movement of said movable output member in an analogue manner, a pulse oscillator operable to produce pulses at a predetermined constant pulse repetition frequency, a gate circuit, a pulse counter operative to count the pulses from said pulse oscillator through said gate circuit, a digital-to-analogue converter operative to convert the output from said pulse counter to an analogue quantity, difference detector means for comparing the output from said analogue position detector with the analogue output from said digital-toanalogue converter to detect whether or not a difference exists therebetween and operative in the presence of said difference to gate said gate circuit to permit the pulses from said pulse oscillator to pass therethrough, a position counter for registering a position information instructing said command position and counting down the pulses passed through said gate circuit, and means responsive to the output from said position counter for producing a locating signal.
Claim 2
Dependent Claim
193 words
In a locating device for locating a movable output member at a command position, the combination of a movable output member, positioning means for positioning said movable output member in accordance with a locating signal, analogue position detector means for detecting a magnitude of movement of said movable output member in an analogue manner, a pulse oscillator operable to produce pulses at a predetermined constant pulse repetition frequency, a gate circuit, a pulse counter operative to count the pulses from said pulse oscillator through said gate circuit, a digital-to-analogue converter operative to convert the output from said pulse counter to an analogue quantity, difference detector means for comparing the output from said analogue position detector with the analogue output from said digital-toanalogue converter to detect whether or not a difference exists therebetween and operative in the presence of said difference to gate said gate circuit to permit the pulses from said pulse oscillator to pass therethrough, a position counter for registering a position information instructing said command position and counting down the pulses passed through said gate circuit, and means responsive to the output from said position counter for producing a locating signal.
Claim 3
Dependent Claim
17 words
A locating device as claimed in claim 1 wherein said analogue position detector means includes a resolver.
Claim 4
Dependent Claim
86 words
A locating device as claimed in claim 1 wherein said means for producing a locating signal includes a residual distance sensor circuit connected to said position counter to sense the residual distance of the moving member up to said command position from the digital value remaining in said position counter, and a speed switching circuit responsive to the output from said sensor circuit to selectively switch the speed of said positioning means from a high mAgnitude to a moderate magnitude and then to a low magnitude.
Claim 5
Dependent Claim
105 words
A locating device as claimed in claim 1 wherein said pulse counter and said digital-to-analogue converter consist of a pulse generator for generating pulses at a predetermined constant pulse repetition frequency, a pulse counting circuit connected to said pulse generator to count up the pulses therefrom and having applied thereto the pulses passed through said gate circuit to count them in one of the up and down directions dependent upon a control signal applied thereto to produce the corresponding pulse repetition frequency, and a frequency divider circuit connected to said pulse counting circuit to divide said pulse repetition frequency provided therefrom by a predetermined number.
References Cited (Backward Citations)
US3175138A
Cited
US3400314A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |