Yarn feeding adjustment method for circular knitting machines

Abstract

A method for adjusting the yarn supply of a circular knitting machine is disclosed, which is executed by a controller on the machine. The controller obtains the weights of a polyurethane fiber yarn and a base yarn in a needle loop and calculates the current addition ratio. Based on the current addition ratio and a target addition ratio, the controller controls an active yarn feed assembly to adjust the supply conditions of the polyurethane fiber yarn so that the addition ratio of the polyurethane fiber yarn in the next needle loop of the circular knitting machine matches the target addition ratio. The aforementioned supply conditions may be the yarn tension or the yarn length of the polyurethane fiber yarn.

Claims

1. A yarn supply adjustment method for a circular knitting machine, executed by a controller on the circular knitting machine, the yarn supply adjustment method comprising the steps of: obtaining the weights of a polyurethane fiber yarn and a base yarn in a needle loop respectively, and calculating the current addition ratio; and, based on the current addition ratio and a target addition ratio, controlling an active yarn feeding component to adjust the supply conditions of the polyurethane fiber yarn so that the addition ratio of the polyurethane fiber yarn in the next needle loop of the circular knitting machine matches the target addition ratio, wherein the aforementioned supply conditions may be a yarn supply tension of the polyurethane fiber yarn or a yarn supply length of the polyurethane fiber yarn.

2. The yarn feeding adjustment method for a circular knitting machine as described in claim 1, wherein, The controller incorporates an allowable range into the calculation of the polyurethane fiber yarn addition ratio and the target addition ratio, which is the target addition ratio ± allowable value.

3. The yarn feeding adjustment method for a circular knitting machine as described in claim 1 or 2, wherein, The yarn supply adjustment method further includes the steps of: monitoring the supply conditions of the active yarn feeding component based on a yarn supply warning condition, the yarn supply warning condition including an upper limit value of yarn supply tension, a lower limit value of yarn supply tension, an upper limit value of yarn supply length and a lower limit value of yarn supply length, and the controller generating an alarm when the yarn supply warning condition is met.

4. The yarn feeding adjustment method for a circular knitting machine as described in claim 3, wherein, When the controller receives a target range for yarn feeding tension, it controls the yarn feeding length of the active yarn feeding assembly based on the target range for yarn feeding tension. When the controller receives a target range for yarn feeding length, it controls the yarn feeding tension of the active yarn feeding assembly based on the target range for yarn feeding length.

5. The yarn feeding adjustment method for a circular knitting machine as described in claim 4, wherein, The weight of the polyurethane fiber yarn in one loop is calculated based on the current yarn supply length and yarn specifications of the polyurethane fiber yarn, and the weight of the base yarn in one loop is calculated based on the current yarn supply length and yarn specifications of the base yarn.

6. The yarn feeding adjustment method for a circular knitting machine as described in claim 1 or 2, wherein, The weight of the polyurethane fiber yarn in one loop is calculated based on the current yarn supply length and yarn specifications of the polyurethane fiber yarn, and the weight of the base yarn in one loop is calculated based on the current yarn supply length and yarn specifications of the base yarn.

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