APPARATUS FOR CHANGING AUTOMATICALLY POSITION OF TOP OF SHED OF LOOM

摘要

PURPOSE: To assure an always uniform weaving density by automatically varying the position of a shed vertex in a direction where the differences between the variation value of every beat-up and a preset value are decreased during the transient state following loom stoppages. CONSTITUTION: The loom is started and the deformation of a deflection bar 13 which occurs under ordinary operation is measured by a deformation sensor 19 at every beat-up and this value is set at a set value unit 25 after the loom stoppage. The loom is then restarted and the deformation value measured by this sensor 19 at every beat-up during the transient state following the loom stoppage and the set value unit 25 described above are compared by a comparator 22 and the differential signal thereof is outputted to a converter 28. This converter 28 is converted to the control voltage of an electric motor 5 for driving a warp feeding beam 17 and an electric motor 18 for driving a take-up roller 14. The drives of these motors 5 and 18 are controlled in accordance with this control voltage, by which the position of the vertex 10 of the shed 9 is changed and the differences to be outputted to the comparator 22 are decreased.