Patent US3704579A successfully refreshed from Google Patents.
US3704579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Practical method and apparatus for driving an open-end spinning frame
Assignee: Toyota Industries Corp
•
Filing: 1971-04-16
•
Granted: 1972-12-05
•
Expires: 1991-04-16
Abstract
Abstract Method and apparatus capable of controlling the driving speed of the open-end spinning frame utilizing a plurality of spinning units by applying at least two variable frequency electric sources. A first electric source is used for driving all spinning units for carrying out the normal spinning operation, while a second electric source is used for driving a spinning unit of yarn breakages used for carrying out the yarn piecing operation. The latter source is mounted on a carriage capable of being displaced along the spinning frame and can be stopped at a desired working position correctly.
Inventors
- 👤 Takuzo Tooka
- 👤 Choji Nozaki
- 👤 Kiichi Kono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:02
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/48; D01H4/50; D01H4/04; D01H4/08; D01H4/12; D01H4/14
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
234 words
A method of driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously delivered from the cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor and a takeup roller making a package of said yarn delivered from said drawoff rollers; comprising driving each spinning rotor, said feed rollers, said draw-off rollers and said take-up roller by means of individual motors respectively, driving said motors of all spinning units at a predetermined variable high speed by connecting said motors with a first common variable frequency electric source for carrying out a normal spinning operation, detecting yarn breakage of one individual spinning unit and driving said individual motors of a single spinning unit at a predetermined variable low speed by connecting said motors with a second variable frequency electric source mounted on a carrier displaceable along said spinning frame past said plurality of spinning units for carrying out a yarn piecing operation after disconnecting said motors from said first electric source, and after completion of said yarn piecing operation, driving said motors of said particular spinning unit at said high speed by connecting again with said first electric source.
Claim 2
Independent Claim
234 words
A method of driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously delivered from the cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor and a takeup roller making a package of said yarn delivered from said drawoff rollers; comprising driving each spinning rotor, said feed rollers, said draw-off rollers and said take-up roller by means of individual motors respectively, driving said motors of all spinning units at a predetermined variable high speed by connecting said motors with a first common variable frequency electric source for carrying out a normal spinning operation, detecting yarn breakage of one individual spinning unit and driving said individual motors of a single spinning unit at a predetermined variable low speed by connecting said motors with a second variable frequency electric source mounted on a carrier displaceable along said spinning frame past said plurality of spinning units for carrying out a yarn piecing operation after disconnecting said motors from said first electric source, and after completion of said yarn piecing operation, driving said motors of said particular spinning unit at said high speed by connecting again with said first electric source.
Claim 3
Dependent Claim
38 words
Driving method of an open-end spinning frame according to claim 1, including carrying out said driving by said second electric source when a yarn breakage is detected during a travel motion of said carrier along said spinning frame.
Claim 4
Dependent Claim
48 words
Driving method of an open-end spinning frame according to claim 2, including commencing said high speed driving of all motors for driving respective rotors at a predetermined low speed and gradually accelerating said low seed driving up to the predetermined high speed for carrying out normal spinning operations.
Claim 5
Dependent Claim
84 words
Driving method of an open-end spinning frame according to claim 1 including commencing said low speed driving of said motor of a spinning unit wherein a yarn piecing operation is required at a predetermined very low speed, and after completion of said yarn piecing operation, gradually accelerating said driving speed up to the predetermined high speed for carrying out normal spinning operations, thereafter changing said driving connection of said motor with said second variable frequency electric source to said first variable frequency electric source.
Claim 6
Dependent Claim
47 words
Driving method of an open-end spinning frame according to claim 1, including carrying out variable speed driving of said motor by saiD second variable frequency electric source together with variable speed driving of said feed rollers, draw-off rollers and take-up roller while maintaining relative speed ratios therebetween.
Claim 7
Independent Claim
238 words
An apparatus for driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously removed from said cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor, a take-up roller for producing a package from said yarn delivered from said draw-off rollers, comprising respective individual motors for directly driving said spinning rotor, said feed rollers, said draw-off rollers, and said take-off roller of each spinning unit, means for driving said motors, said driving means comprising a first variable frequency electric source for driving all of said motors at a predetermined high speed for carrying out the normal spinning operation, a second variable frequency electric source for driving said motors of a spinning unit at a predetermined low speed to permit a yarn piecing operation, said second variable frequency electric source mounted on a carrier, means for displacing said carrier along said spinning frame, means for connecting said motors of said spinning unit that has a yarn breakage to said second variable frequency electric source instead of said first electric source and again connecting said motors to said first electric source instead of said second electric source after completion of said yarn piecing operation.
Claim 8
Independent Claim
238 words
An apparatus for driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously removed from said cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor, a take-up roller for producing a package from said yarn delivered from said draw-off rollers, comprising respective individual motors for directly driving said spinning rotor, said feed rollers, said draw-off rollers, and said take-off roller of each spinning unit, means for driving said motors, said driving means comprising a first variable frequency electric source for driving all of said motors at a predetermined high speed for carrying out the normal spinning operation, a second variable frequency electric source for driving said motors of a spinning unit at a predetermined low speed to permit a yarn piecing operation, said second variable frequency electric source mounted on a carrier, means for displacing said carrier along said spinning frame, means for connecting said motors of said spinning unit that has a yarn breakage to said second variable frequency electric source instead of said first electric source and again connecting said motors to said first electric source instead of said second electric source after completion of said yarn piecing operation.
Claim 9
Dependent Claim
30 words
Driving apparatus of an open-end spinning frame according to claim 6, wherein said first and second variable frequency electric sources are generators which are driven by respective variable speed motors.
Claim 10
Dependent Claim
26 words
Driving apparatus of an open-end spinning frame according to claim 7, wherein said first and second variable frequency electric sources are static variable frequency electric sources.
Claim 11
Dependent Claim
26 words
Driving apparatus of an open-end spinning frame according to claim 8, wherein said static variable frequency electric source includes a plurality of semi-conductor elements comprising thyristors.
Claim 12
Dependent Claim
96 words
Driving apparatus of an open-end spinning frame according to claim 6, further comprising a first mechanical driving means provided with a pair of shafts extending from said driving means through all spinning units, a second driving means provided with a pair of shafts extending through said carrier of said second electric source, said feed and take-off rollers each having drive shafts, and clutch means mounted on each spinning unit for engaging or disengaging said drive shafts of said feed roller and draw-off roller alternatively with respective shafts of said first electric source or second electric source.
Claim 13
Dependent Claim
64 words
Driving apparatus of an open-end spinning frame according to claim 6, further comprising means for positioning said second electric source at a working position directly in front of a spinning unit wherein a yarn break is detected, means for engaging respective conductors for driving rotatable members of a spinning unit wherein the yarn break is detected with corresponding terminals of said second electric source.
Claim 14
Dependent Claim
32 words
Driving apparatus of an open-end spinning frame according to claim 6, wherein said second electric source is provided with a control means for controlling the ratio of driving speeds of rotatable elements.
Claim 15
Independent Claim
240 words
An apparatus for driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously removed from said cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor, a take-up roller for producing a package from said yarn delivered from said draw-off rollers, comprising individual motors for separately driving said spinning rotor, feeding rollers, draw-off rollers together with said take-up roller of each spinning unit, means for driving said motors, said driving means comprising a first variable frequency electric source for driving all of said rotatable members of said spinning frame at a predetermined high speed for carrying out the normal spinning operation, a second variable frequency electric source for driving said motors of a spinning unit at a predetermined low speed to permit a yarn piecing operation, said second variable frequency electric source mounted on a carrier, means for displacing said carrier along said spinning frame, means for connecting said motors of said spinning unit that has yarn breakage to said second variable frequency electric source instead of said first electric source and again connecting said motors to said first electric source instead of said second electric source after completion of said yarn piecing operation.
Claim 16
Independent Claim
240 words
An apparatus for driving an open-end spinning frame utilizing a plurality of spinning units each having a spinning rotor provided with a centrifugal rotary spinning cavity into which liberated fibers are continuously introduced to spin them into a yarn which is continuously removed from said cavity, a pair of feed rollers supplying a bundle of fibers to said spinning rotor and a pair of draw-off rollers delivering said yarn from said rotor, a take-up roller for producing a package from said yarn delivered from said draw-off rollers, comprising individual motors for separately driving said spinning rotor, feeding rollers, draw-off rollers together with said take-up roller of each spinning unit, means for driving said motors, said driving means comprising a first variable frequency electric source for driving all of said rotatable members of said spinning frame at a predetermined high speed for carrying out the normal spinning operation, a second variable frequency electric source for driving said motors of a spinning unit at a predetermined low speed to permit a yarn piecing operation, said second variable frequency electric source mounted on a carrier, means for displacing said carrier along said spinning frame, means for connecting said motors of said spinning unit that has yarn breakage to said second variable frequency electric source instead of said first electric source and again connecting said motors to said first electric source instead of said second electric source after completion of said yarn piecing operation.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |