| 摘要 |
A sheathing tool for continuously forming a band-shaped foil into a sheath around a moving strand material having a circular cross section, the tool being composed of a matrix having a circular cross section the diameter of which automatically varies to accommodate fluctuations which may occur in the diameter of the strand material. The matrix is constituted either by two rollers fastened to rotatably mounted shafts and having their peripheral edges contacting, each roller being provided with a semicircular cross section groove the diameter of which varies around the circumference of the roller, or by two identical ring segment pieces having eccentric inner diameters and attached to the outer surfaces of cylindrical rollers eccentrically fastened to the rotatably mounted shafts so that the peripheral edges of the pieces are concentric with the shafts and are always contacting. In both embodiments, the shafts are urged in a direction which tends to decrease the diameter of the matrix opening.
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