Sliver guiding and measuring assembly having an exchangeable component

摘要

An apparatus for measuring sliver thickness in a drawing frame includes first and second selectively used sliver guiding devices having converging inner wall faces for bringing a plurality of simultaneously introduced slivers together to form a sliver assembly constituted by side-by-side positioned running slivers arranged in a plane. Each sliver guiding device has a sliver inlet and a smaller sliver outlet. Either the inlet or the outlet, or both, have different passage areas in the different sliver guiding devices. A receiving arrangement accommodates the selected sliver guiding device in the apparatus. The apparatus further includes a sensor element and a counterelement laterally contacting the sliver assembly from opposite sides. The sensor element is urged into a resilient contact with the sliver assembly whereby the sensor element undergoes excursions upon variation of thickness of the sliver assembly. The sensor element and the counterelement together define a constriction through which the sliver assembly passes. A transducer converts excursions of the sensor element into electric pulses. A withdrawing roller pair supported downstream of the sliver guiding device pulls the sliver assembly through the sliver guiding device.