On the Winding Mechanism of a Roving Frame

概要

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On the winding and twisting mechanism of a roving frame which uses cone pulleys and bobbin lead system, the following conclusions were obtained. 1. Edge of the bobbin layers has a constant taper. tanθ=2πrsinφ/nWo where θ : taper, r : radius of rack wheel, Wo : thickness of rove. n : tooth uumbers of ratchet wheel, φ : angle of anchor bar when bobbin rail turns back. 2. Ratio of top and bottom cone diameters, Md, does not vary inversely as bobbin diameter, d. Md = k4/d +, k5 constant But, as value k5 is small, Md approximately varies in inverse proportion to d. 3. The relation between coil pitch of rove, P, and d is as follows. P=k4+k5d/k4+k5D W where D : bore bobbin diameter. W : width of the first layer rove on the bobbin. 4. Bobbin draft, Dr, is very small, and it reduces as d decreases and aslncorrect revolving angle of swing motion δy, , reduces. Dr=√1+δy/πnd+(P/πd)2 nd : coil numbers per unit time when it is woand on d. 5. Pressure against a bobbin on winding decreases as d increases. 6. Twisting number is constant except the start and the stop of the frame.
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