Management apparatus for a plurality of cassettes

Claim 1

A use management apparatus for a plurality of cassettes, comprising: cassette information storage means for storing presence/absence information corresponding to each of a plurality of cassettes which are located at a plurality of carrying positions, and presence/absence information corresponding to safety lugs of said cassettes, said information stored in said cassette information storing means being used as input information; use cassette determination/control means for determining a use cassette from said plurality of cassettes based on said input information; cassette convey control means for conveying and mounting said use cassette on a tape driving section; time reservation information storage means for storing a set of designation information, operation information and timer information, said timing information including timer start times for each timing operation; timer measurement means for measuring and inputting a current time; means for comparing said timing information with said current time to determine an amount of time remaining before a next timing operation, and for comparing said determined amount of time remaining with an amount of time necessary to measure a tape remaining amount on one of said cassettes; and tape remaining amount measurement means for measuring a tape remaining amount on one of said plurality of cassettes and for storing said measured tape remaining amount in said cassette information storage means, said tape remaining amount being measured only when said determined amount of time remaining is greater than said amount of time necessary to measure said tape remaining amount on one of said cassettes, wherein said determination of measured tape amounts is used by said use cassette determination/control means for determining which cassettes are selected as use cassettes.