Patent ID: 6976511

Claim:
Method for controlling a weft yarn-feeding device in a yarn processing system which includes a weft yarn feeding device and a power loom which consumes weft yarn at the start of a weaving operation, according to which method a drive motor of the yarn feeding device is switched on and switched off and is accelerated or decelerated, respectively, by a control device in response to control signals of a yarn-store size monitoring arrangement associated with the yarn feeding device in order to maintain, in the feeding device, a yarn store size sufficient to cover the yarn consumption after initial start-up of the weaving operation, said method comprising the steps of: generating a run signal at a side of the power loom correlated to the start of the weaving operation; deriving an external start signal for the yarn feeding device in a timed correlation to and from the run signal; transmitting the external start signal to the control device of the yarn feeding device; and starting the drive motor of the yarn feeding device in response to the transmitted external start signal and driving the drive motor such that the drive motor is at a predetermined optimum speed prior to release of yarn by the yarn feeding device to prevent an undesirable decrease in yarn store size due to a high yarn consumption at the initial start-up of the weaving operation in the power loom.