US3636696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Programmed drive systems for drawtwisters
Assignee: Monsanto Co
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Filing: 1970-01-22
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Granted: 1972-01-25
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Expires: 1990-01-22
Abstract
Abstract A separate spindle-drive AC motor on a drawtwister or spinning frame. A programmed DC voltage controls an inverter for varying the speed of the separate spindle AC motor independently of the yarn speed.
Inventors
- 👤 Frederick J Howe
- 👤 Mario E Jimenez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
D; D01; D01H; D01H1/00; D01H1/14; D01H1/20; D01H1/28; D01H1/30; D01H1/305
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
199 words
In yarn-processing apparatus wherein yarn is fed by a roll to a ring-and-traveller takeup mechanism, said mechanism including a spindle, a ring surrounding said spindle, a traveller for orbiting on said ring, and means for traversing said ring axially with respect to said spindle, the improvement comprising: A. means including a first drive shaft for driving said roll from a first AC motor; B. means including a second drive shaft for driving said spindle from a second AC motor; C. means for varying the speed of said second AC motor whereby the speed of said spindle can be varied independently of the speed of said roll, comprising: 1. a frequency controlled oscillator producing on its output terminals a signal having a frequency controlled by the amplitude of an input DC control signal; 2. an inverter driver having input terminals connected to said oscillator output terminals, and having inverter output terminals; 3. an inverter energized from a DC power supply, said inverter having control terminals connected to said inverter driver output terminals, and having output terminals connected to said second AC motor; and 4. control means for controlling the amplitude of said DC control signal according to a predetermined program.
Claim 2
Dependent Claim
199 words
In yarn-processing apparatus wherein yarn is fed by a roll to a ring-and-traveller takeup mechanism, said mechanism including a spindle, a ring surrounding said spindle, a traveller for orbiting on said ring, and means for traversing said ring axially with respect to said spindle, the improvement comprising: A. means including a first drive shaft for driving said roll from a first AC motor; B. means including a second drive shaft for driving said spindle from a second AC motor; C. means for varying the speed of said second AC motor whereby the speed of said spindle can be varied independently of the speed of said roll, comprising: 1. a frequency controlled oscillator producing on its output terminals a signal having a frequency controlled by the amplitude of an input DC control signal; 2. an inverter driver having input terminals connected to said oscillator output terminals, and having inverter output terminals; 3. an inverter energized from a DC power supply, said inverter having control terminals connected to said inverter driver output terminals, and having output terminals connected to said second AC motor; and 4. control means for controlling the amplitude of said DC control signal according to a predetermined program.
Claim 3
Dependent Claim
17 words
an inverter driver having input terminals connected to said oscillator output terminals, and having inverter output terminals;
Claim 4
Dependent Claim
17 words
an inverter driver having input terminals connected to said oscillator output terminals, and having inverter output terminals;
Claim 5
Dependent Claim
23 words
The apparatus defined in claim 1, wherein said inverter output is three-phase AC, and wherein said second AC motor is a three-phase motor.
Claim 6
Dependent Claim
15 words
The apparatus defined in claim 1, wherein said second AC motor is an induction motor.
Claim 7
Dependent Claim
31 words
an inverter energized from a DC power supply, said inverter having control terminals connected to said inverter driver output terminals, and having output terminals connected to said second AC motor; and
Claim 8
Dependent Claim
31 words
an inverter energized from a DC power supply, said inverter having control terminals connected to said inverter driver output terminals, and having output terminals connected to said second AC motor; and
Claim 9
Dependent Claim
16 words
control means for controlling the amplitude of said DC control signal according to a predetermined program.
Claim 10
Dependent Claim
16 words
control means for controlling the amplitude of said DC control signal according to a predetermined program.
Claim 11
Dependent Claim
15 words
The apparatus defined in claim 1, wherein said second AC motor is a synchronous motor.
Claim 12
Dependent Claim
141 words
The apparatus defined in claim 1, wherein said control means comprises: A. first and second parallel conductive elements separated by a generally longitudinally extending nonconductive space; B. means for applying to said elements an AC signal balanced with respect to a point of reference potential; C. an electrostatic probe positioned near said space; D. amplifier means for amplifying the output signal from said probe; E. a servomotor driven by the output of said amplifier; F. means coupling said servomotor to drive said probe laterally with respect to said space, the phase of the output signal of said amplifier being such that said probe is driven toward the center of said space; G. means for driving said elements generally longitudinally with respect to said probe as a function of time; and H. a potentiometer having a movable tap driven by said servomotor.
Claim 13
Dependent Claim
120 words
In yarn-processing apparatus wherein yarn is fed by a roll to a ring-and-traVeller takeup mechanism, said mechanism including a spindle, a ring surrounding said spindle, a traveller for orbiting on said ring, and means for traversing said ring axially with respect to said spindle, the improvement comprising: A. means including a first drive shaft for driving said roll from a first motor; B. means including a second drive shaft for driving said spindle from a second AC motor; C. means for varying the speed of said second AC motor whereby the speed of said spindle can be varied independently of the speed of said roll; and D. means including a clutch for coupling said first and said second drive shafts.
Claim 14
Dependent Claim
120 words
In yarn-processing apparatus wherein yarn is fed by a roll to a ring-and-traVeller takeup mechanism, said mechanism including a spindle, a ring surrounding said spindle, a traveller for orbiting on said ring, and means for traversing said ring axially with respect to said spindle, the improvement comprising: A. means including a first drive shaft for driving said roll from a first motor; B. means including a second drive shaft for driving said spindle from a second AC motor; C. means for varying the speed of said second AC motor whereby the speed of said spindle can be varied independently of the speed of said roll; and D. means including a clutch for coupling said first and said second drive shafts.
Claim 15
Dependent Claim
62 words
The apparatus defined in claim 6, wherein said clutch is an overrunning mechanical clutch for preventing the ratio of spindle speed to roll speed from dropping below a given value, said apparatus further comprising means for braking said second shaft whereby braking torque is transmitted to said first shaft and said roll through said clutch in synchronism with braking of said spindle.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |