Patent US3612965A successfully refreshed from Google Patents.
US3612965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving arrangement for a textile drawtwisting machine
Assignee: TMM Research Ltd
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Filing: 1969-01-14
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Granted: 1971-10-12
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Expires: 1989-01-14
Abstract
Abstract A driving arrangement for a drawtwisting machine for drawtwisting continuous filament yarn, comprising a draw zone including draw rolls for drawing the yarn, a takeup and twisting zone including a rotary spindle and a ring and traveler by means of which the drawn yarn is wound onto a package carried by the spindle, a DC electric draw roll motor for driving the draw rolls, a DC electric spindle motor for driving the spindle, common armature voltage control means to control the armature voltages applied to the motors to provide for a variation of the armature voltages from values giving rise to crawl speeds for the two motors for starting up purposes to values giving rise to normal running speeds for the two motors, and yield voltage control means to control the field voltages to be applied to the motors and including automatic means for adjusting the field voltage of the spindle motor thereby to control the speed thereof independently of the speed of the draw roll motor.
Inventors
- 👤 Joseph France
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:28
CPC Classifications
D; D01; D01H; D01H1/00; D01H1/14; D01H1/20; D01H1/28; D01H1/30; D01H1/305; D01H1/32; D01H1/34; D02; D02J; D02J1/00; D02J1/22; D02J1/225
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A driving arrangement for a drawtwisting machine for drawtwisting continuous filament yarn, comprising a draw zone including draw rolls for drawing the yarn, a takeup and twisting zone including a rotary spindle and a ring and traveller by means of which the drawn yarn is wound onto a package carried by the spindle, a DC electric draw roll motor for driving the draw rolls, a DC electric spindle motor for driving the spindle, common armature voltage control means to control the armature voltages applied to said motors to provide for a variation of said armature voltages from values giving rise to crawl speeds for the two motors for starting up purposes two motors, and field voltage control means to control the field voltages to be applied to said motors and including automatic means for adjusting the field voltage of said spindle motor thereby to control the speed thereof independently of the speed of the draw roll motor.
Claim 2
Dependent Claim
157 words
A driving arrangement for a drawtwisting machine for drawtwisting continuous filament yarn, comprising a draw zone including draw rolls for drawing the yarn, a takeup and twisting zone including a rotary spindle and a ring and traveller by means of which the drawn yarn is wound onto a package carried by the spindle, a DC electric draw roll motor for driving the draw rolls, a DC electric spindle motor for driving the spindle, common armature voltage control means to control the armature voltages applied to said motors to provide for a variation of said armature voltages from values giving rise to crawl speeds for the two motors for starting up purposes two motors, and field voltage control means to control the field voltages to be applied to said motors and including automatic means for adjusting the field voltage of said spindle motor thereby to control the speed thereof independently of the speed of the draw roll motor.
Claim 3
Dependent Claim
38 words
An arrangement according to claim 1, wherein said automatic means comprises a programmed element producing a field voltage variation which gives rise to a predetermined variation in the speed of the spindle during the build of a package.
Claim 4
Dependent Claim
40 words
An arrangement according to claim 2, wherein said programmed element comprises a rotary cam which rotates once during each package build and which has a profile drivingly engaging a control element controlling the field voltage applied to said spindle motor.
Claim 5
Dependent Claim
34 words
An arrangement according to claim 1, wherein said field voltage control means includes means to control the field voltage applied to said drawroll motor, independently of the field voltage applied to said spIndle motor.
Claim 6
Dependent Claim
16 words
An arrangement according to claim 4, wherein said last-mentioned means includes a manually operable control element.
Claim 7
Dependent Claim
21 words
An arrangement according to claim 1, wherein means are provided for automatically changing over from crawl speed to normal running speed.
Claim 8
Dependent Claim
81 words
An arrangement according to claim 1, wherein said common armature voltage control means comprises a first adjustable control element which can be adjusted to provide basic running speeds for the two motors and a second adjustable control element which can be switched between two positions in one of which it gives rise to an armature voltage providing said crawl speeds for the two motors and in the other of which the armature voltage provides normal running speeds for the two motors.
Claim 9
Dependent Claim
39 words
An arrangement according to claim 7, wherein means are provided for automatically adjusting said second adjustable control element to effect a change over from crawl speeds to normal running speeds of the two motors over a predetermined time interval.
Claim 10
Dependent Claim
34 words
An arrangement according to claim 1, wherein said draw roll motor is coupled to drive a tachogenerator generating a negative feed back signal to provide closed loop armature control for said draw roll motor.
Claim 11
Dependent Claim
33 words
An arrangement according to claim 1, wherein said spindle motor is coupled to drive a tachogenerator generating a negative feed back signal to provide closed loop field control for the said spindle motor.
Claim 12
Dependent Claim
99 words
An arrangement according to claim 1, wherein said draw roll motor receives its armature and field voltages as DC output voltages from a first rectifier unit fed from an alternating current supply, wherein said spindle motor receives its armature voltage as a DC output voltage from the first rectifier unit and its field voltage as a DC output voltage from a second rectifier unit fed from said alternating current supply, and wherein said common armature voltage control means and said field voltage control means are such as to produce variations in the DC output voltages from the rectifier units.
Claim 13
Dependent Claim
45 words
An arrangement according to claim 1, including a resistance element connected in the armature circuit of said draw roll motor to allow the spindles to lead on starting up the machine and arranged automatically to cut out when the motors reach their normal running speeds.
Claim 14
Dependent Claim
34 words
An arrangement according to claim 1, comprising means automatically responsive to the switching off of the machine to connect a resistor across the armatures of the two motors to provide dynamic braking on deceleration.
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) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |