US3599068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Locating speed reduction device
Assignee: Mitsubishi Electric Corp
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Filing: 1968-12-18
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Granted: 1971-08-10
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Expires: 1988-12-18
Abstract
Abstract A numerically controlled machine tool is first moved at a constant speed determined by a corresponding speed information signal until it reaches a predetermined distance from its command position. Then a position information signal representing the distance of movement of the member is coupled to control the pulse repetition frequency of a variable frequency oscillator having its output coupled to a position counter, thereby causing the counter to count down. The number of pulses in the form of a phase of square waveform is compared with the actual position of the member in the similar form and a difference between them is used to energize a drive device for the member. When the counter clears, the member reaches its command position and stops.
Inventors
- 👤 Taka-Aki Kanamori
- 👤 Yasutsugu Juroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:23
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/33; G05B19/35; G05B19/351; G05B2219/00; G05B2219/30; G05B2219/43; G05B2219/43179
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
131 words
In a numerical control apparatus for a machine tool for controlling movement of a controlled member to a command position, a locating speed reduction device comprising means for providing a speed signal determined by a distance between the actual and command positions of a controlled member, means coupled to said speed signal means for comparing a given speed signal with a distance of the controlled member from the command position thereof, means coupled to said comparing means for determining a position relative to the command position from which the controlled member is to be moved at a reduced speed, and means coupled to said relative position determining means for reducing the speed of movement of the controlled member immediately before the controlled member is caused to stop at the command position.
Claim 2
Dependent Claim
131 words
In a numerical control apparatus for a machine tool for controlling movement of a controlled member to a command position, a locating speed reduction device comprising means for providing a speed signal determined by a distance between the actual and command positions of a controlled member, means coupled to said speed signal means for comparing a given speed signal with a distance of the controlled member from the command position thereof, means coupled to said comparing means for determining a position relative to the command position from which the controlled member is to be moved at a reduced speed, and means coupled to said relative position determining means for reducing the speed of movement of the controlled member immediately before the controlled member is caused to stop at the command position.
Claim 3
Dependent Claim
308 words
In a numerical control apparatus for a machine tool, for controlling movement of a controlled member to a command position, a locating speed reduction device comprising drive means for a controlled member, first means for providing a speed information signal representing a speed of the controlled member, second means for providing a position information signal representative of a distance to which the controlled member is to be moved, voltage comparing and switching means coupled to both the first and second means to permit a speed signal from the first means to pass therethrough when the position signal is greater in magnitude than the speed signal and to permit a position signal from the second means to pass therethrough when the speed signal is greater in magnitude than the position signal, variable frequency oscillator means connected to the voltage comparing and switching means to produce pulses at a pulse repetition frequency controlled by tHe voltage comparing and switching means, a gate circuit interconnecting said oscillator and said second means, residual distance sensor means connected between said second means and said gate circuit to monitor said second means to permit the pulses from the variable frequency oscillator means to be applied to the second means as long as the second means has digital information still remaining therein, the pulses from the oscillator means applied to the second means being counted down by said second means to decrease the value of the digital information in the second means; position detector means for detecting the actual position of the controlled member; and phase difference detector means coupled to said drive means, said oscillator means, and said position detector means, for detecting a phase difference between the output from the variable frequency oscillator means and the output from the position detector means to provide a reduced speed signal for energizing the drive means.
Claim 4
Dependent Claim
308 words
In a numerical control apparatus for a machine tool, for controlling movement of a controlled member to a command position, a locating speed reduction device comprising drive means for a controlled member, first means for providing a speed information signal representing a speed of the controlled member, second means for providing a position information signal representative of a distance to which the controlled member is to be moved, voltage comparing and switching means coupled to both the first and second means to permit a speed signal from the first means to pass therethrough when the position signal is greater in magnitude than the speed signal and to permit a position signal from the second means to pass therethrough when the speed signal is greater in magnitude than the position signal, variable frequency oscillator means connected to the voltage comparing and switching means to produce pulses at a pulse repetition frequency controlled by tHe voltage comparing and switching means, a gate circuit interconnecting said oscillator and said second means, residual distance sensor means connected between said second means and said gate circuit to monitor said second means to permit the pulses from the variable frequency oscillator means to be applied to the second means as long as the second means has digital information still remaining therein, the pulses from the oscillator means applied to the second means being counted down by said second means to decrease the value of the digital information in the second means; position detector means for detecting the actual position of the controlled member; and phase difference detector means coupled to said drive means, said oscillator means, and said position detector means, for detecting a phase difference between the output from the variable frequency oscillator means and the output from the position detector means to provide a reduced speed signal for energizing the drive means.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |