Patent Number: 
Section: claims

1. An electron beam sterilizer which sterilizes vessels being conveyed by irradiation with an electron beam, comprisingvessel holder means including a pair of holders which carries two vessels in vertical alignment, transfer means on which a plurality of vessel holder means are mounted at an equal spacing and cyclically transferred, inversion means for inverting the vessel holder means by rotating it about an axis parallel to a direction in which the transfer means advances, and an electron beam irradiator capable of irradiating the electron beam across the upper and the lower end of the two vessels which are carried in vertical alignment by the vessel holder means,the arrangement being such that a transfer path of the transfer means extends from a vessel feed position to a vessel discharge position and includes an inversion interval where the inversion means inverts the vessel holder means and an upright transfer interval where the vessels in vertical alignment are transferred in an upright position, the electron beam irradiator having an electron beam irradiation position which is chosen to be within the upright transfer interval, the vessels which are fed through the vessel feed position being discharged at the vessel discharge position after passing through the electron beam irradiation position and the inversion interval twice. 2. An electron beam sterilizer according to claim 1 in which the inversion means comprises a guide rail disposed along a transfer path for the vessel holder means, and an engaging member mounted on the vessel holder means and engaging the guide rail. 3. An electron beam sterilizer according to claim 1 in which the holder of the vessel holder means comprises a pair of holding plates which are attracted toward each other by springs, the holding plates being effective to hold a neck of a vessel sandwiched therebetween. 4. An electron beam sterilizer according to claim 1 in which the holder of the vessel holder means comprises a vacuum table which applies a vacuum suction for holding the vessel by sucking the bottom surface thereof. 5. An electron beam sterilizer according to claim 1 in which the electron beam irradiation position is chosen to be between a feed position where vessels are fed to the transfer means and a start position of the inversion interval. 6. An electron beam sterilizer according to claim 1 in which the electron beam irradiation position is chosen to be between an end position of the inversion interval and the discharge position where vessels are discharged from the transfer means.