Patent Number: 047556862
Section: claims

1. An electron beam irradiation apparatus for treating linear material with electron beams, said apparatus comprising: an electron beam accelerator means for emitting electron beams, the emitted electron beams collectively defining an irradiation zone;  a plurality of pulley units, each of said pulley units comprising a pair of pulleys extending parallel to one another and around which the linear material is to be wound for supporting the linear material, and said pulley units being disposed end to end in the direction of the rotational axes of the pulleys;  a plurality of drive means each of which is operatively connected to a respective one of said pulley units for rotating the pair of pulleys thereof to feed the linear material; and  a position changing means operatively connected to said plurality of pulley units for positioning the pulleys of each of said pulley units with respect to the irradiation zone and for selectively moving said pulley units in a direction extending parallel to the rotational axes of the pulleys between a plurality of positions, each of said positions being one at which at least one of the pairs of pulleys of said plurality of pulley units assumes an irradiation position at which the linear material supported by said at least one of the pairs pulleys is in the irradiation zone and and at least another of said pairs of pulleys is in a non-irradiation position at which said at least another of said pairs of pulleys is out of the irradiation zone.  wherein each of said positions to which said pulley units are selectively moved by said position changing means is a position at which at least two of said pairs of pulleys assume said irradiation position, and  further comprising an electron beam interrupting means selectively movable over the irradiation zone between a first position at which the interrupting means blocks the electron beams to which one of said at least two of the pairs of pulley are exposed and a second position at which the interrupting means blocks the electron beams to which the other of said at least two of the pairs of pulleys are exposed. 2. An electron beam irradiation apparatus as claimed in claim 1,