Patent US3675446A successfully refreshed from Google Patents.
US3675446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive feed system for circular knitting machines
Assignee: Triplite Ltd
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Filing: 1970-06-16
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Granted: 1972-07-11
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Expires: 1990-06-16
Abstract
Abstract An adjustable positive yarn feed system comprises a variable diameter wheel used to drive a band, tape or the like by which positive feed is applied to a yarn or yarns, adjusting means for varying the wheel diameter a stepping motor for effecting incremental variation of the setting of the adjusting means, and a control device for actuating the stepping motor as and when required.
Inventors
- 👤 Albert Edward Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:12
CPC Classifications
D; D04; D04B; D04B15/00; D04B15/94; D04B15/38; D04B15/48
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
In a positive yarn feed system for a knitting machine, the combination comprising positively driven yarn feeding rollers, an endless band for driving said rollers, a variable diameter wheel through which said endless band is driven, means for driving the variable diameter wheel, a rotary adjusting means for varying the effective diameter of said variable diameter wheel, a stepping motor, drive connecting means between said stepping motor and said rotary adjusting means, and a control device for activating the stepping motor in predetermined manner.
Claim 2
Dependent Claim
84 words
In a positive yarn feed system for a knitting machine, the combination comprising positively driven yarn feeding rollers, an endless band for driving said rollers, a variable diameter wheel through which said endless band is driven, means for driving the variable diameter wheel, a rotary adjusting means for varying the effective diameter of said variable diameter wheel, a stepping motor, drive connecting means between said stepping motor and said rotary adjusting means, and a control device for activating the stepping motor in predetermined manner.
Claim 3
Dependent Claim
54 words
A combination according to claim 1 wherein said control device includes means for activating the stepping motor to vary the setting of the adjusting means in small increments forwardly or in reverse to provide for required changes in the ratio of the drive whereby changes in positive feed rate are effected smoothly and effectively.
Claim 4
Dependent Claim
64 words
A combination according to claim 1 wherein the rotary adjusting means includes a cam disc and said drive connecting means comprises gear means connecting said disc to the stepping motor and wherein the variable diameter wheel comprises a series of blocks forming wheel segments which are adjustable radially by the cam disc in response to actuation of the gear means by the stepping motor.
Claim 5
Dependent Claim
68 words
A combination according to claim 3 wherein the said cam disc is positioned at one side of the wheel and mounted rotatably for adjustment of the radial positions of said blocks and wherein the gear means include gear teeth peripherally formed on the cam disc and a train of gears driven from the stepping motor including a pinion gear engaging with the gear teeth on the cam disc.
Claim 6
Dependent Claim
31 words
A combination according to claim 1 wherein the control device comprises an indicator disc and a sensing device responsive to indications on the disc for controlling operation of the stepping motor.
Claim 7
Dependent Claim
25 words
A cOmbination according to claim 5, comprising means mounting the disc to rotate at a speed related to the speed of the variable diameter wheel.
Claim 8
Dependent Claim
59 words
A combination according to claim 6 wherein the sensing device comprises a scanning head including two photo transistors and at least one light source and wherein the disc is interposed between the photo transistors and the light source and is formed with at least one indicator slot to provide for exposure of the photo transistors to the light source.
Claim 9
Dependent Claim
32 words
A combination according to claim 7 wherein the two phototransistors are mounted peripherally relative to the disc to position them for sequential exposure through a disc slot during rotation of the disc.
Claim 10
Dependent Claim
51 words
A combination according to claim 7 in a system for positively feeding yarn to a knitting machine having patterning means, including means for controlling energization and de-energization of the scanning head, said controlling means being constructed and arranged to be actuated under the dictates of the patterning means of the machine.
Claim 11
Dependent Claim
50 words
A combination according to claim 7 comprising an auxiliary scanning head and a related auxiliary disc with at least one slot formed therein for scanning by the auxiliary scanning head, and means for driving the auxiliary disc at a speed proportional to but slower than that of the indicator disc.
Claim 12
Dependent Claim
26 words
A combination according to claim 10 including means for causing either one of the two scanning heads to actuate the stepping motor in accordance with requirements.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |