# US 2014/0191074 A1 · Yarn-feeding assembly for textile machines

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- Number: US 2014/0191074 A1
- Document ID: US20140191074A1
- Status: Published application
- Kind: A1
- Application number: 14/152,059
- Filed: 2014-01-10
- Published: 2014-07-10
- Earliest claimed: 2013-01-10
- Assignees: L.G.L. Electronics S.p.A.
- Applicants: L.G.L. Electronics S.P.A.
- Inventors: Pietro ZENONI; Rosario CASTELLI
- Web page: https://patentgrep.com/patent/US20140191074A1

## CPC

- D04B 15/48: Thread-feeding devices
- B65H 59/00: Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- D04B: KNITTING
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES

## Abstract

A first yarn feeder is provided with a drum which has a plurality of yarn loops wound thereon and is driven to rotate by a respective motor. The motor is electronically connected to a textile machine for rotating at a speed proportional to the yarn-drawing speed of the textile machine and delivering the yarn wound on the drum to the latter. A second feeder is arranged to draw the yarn from a reel and to deliver it to the first feeder, with a delivery action which is modulated by a control loop. The latter is programmed to stabilize the tension of the yarn unwinding from the second feeder on a predetermined value on the basis of a signal received from a tension sensor operatively coupled to the yarn.

## Claims

### Claim 1

A yarn-feeding assembly, comprising a first yarn feeder provided with a drum which has a plurality of yarn loops wound thereon and is driven to rotate by a respective motor, said motor being electronically connected to a textile machine for rotating at a speed proportional to the yarn-drawing speed of said textile machine and delivering the yarn wound on the drum to the textile machine, and further comprising a second feeder, which is arranged to draw the yarn from a reel and to deliver it to said first feeder, with a delivery action which is modulated by a control loop which is programmed to stabilize the tension of the yarn unwinding from said second feeder on a predetermined value on the basis of a signal received from a tension sensor operatively coupled to the yarn.

### Claim 2 (depends on 1)

The yarn-feeding assembly of claim 1, wherein said tension sensor is arranged between said first feeder and said second feeder.

### Claim 3 (depends on 1)

The yarn-feeding assembly of claim 1, wherein said second feeder is provided with a drum driven to rotate by a respective motor, and said control loop is programmed to modulate the speed of rotation of said drum of the second feeder in such a way as to maintain the tension of the unwinding yarn substantially constant on said predetermined value.

### Claim 4 (depends on 3)

The yarn-feeding assembly of claim 3, wherein said first feeder and said second feeder are integrated in a single housing and their respective motors share the same control circuit.

### Claim 5 (depends on 1)

The yarn-feeding assembly of claim 1, wherein said second feeder is provided with a stationary drum having a plurality of loops of yarn coming from said reel wound thereon, and with braking means controlled by said control loop for applying a modulated braking action to the unwinding yarn in such a way as to maintain the yarn tension substantially constant on said predetermined value.

### Claim 6 (depends on 5)

The yarn-feeding assembly of claim 5, wherein said braking means comprise a hollow, frustoconical braking member which is biased with its inner surface against the delivery edge of said stationary drum by driving means operatively connected to said control loop.