Method and apparatus for regulating the yarn strip width in warping machines

A method of maintaining a desired yarn strip width in warping machines (2) comprising a rotatable warping drum (13) and a warping reed (9) which is adjustable in respect of its width, said warping reed being arranged on a warping carriage which is displaced both in parallel-axis relationship with the warping drum and transversely with respect to said axis during the winding operation so as to build up individual yarn strips on the warping drum, and further comprising in the winding operation, after leaving the warping reed (9), measuring the width of the yarn strip (10) in a contact-less mode using optical means (25) at the point of which it passes onto the warping drum, detecting an actual value and comparing the same with a reference value in a comparison means (32) and in the event of deviations from the reference value activating a control motor (35) at the warping reed (9) and thereby adjusting the width of the warping reed towards the reference value.

A method in claim 9 and 23, characterised in that the warping drum (13) is stopped when a predeterminable difference between the reference value and the actual value is exceeded.

A method of maintaining a desired yarn strip width in warping machines (2) comprising a rotatable warping drum (13) and a warping reed (9) which is adjustable in respect of its width, said warping reed being arranged on a warping carriage which is displaced both in parallel-axis relationship with the warping drum and transversely with respect to said axis during the winding operation so as to build up individual yarn strips onto the warping drum, and further comprising in the winding operation, after leaving the warping reed (9), detecting and measuring width of the yarn strip (10) is in a contact-less mode using optical means (25), at the point at which it passes onto the warping drum, forming an average value in a computer from the measurement values detected during a given measurement period, and in the winding operation, after expiry of the measurement period, the average value serves as a reference value which is continuously compared in a comparison means to the actual value which is just being measured, and activating a control motor at the warping reed and thereby adjusting the width of the warping reed toward the reference in the event of deviations from the reference value.