Magnetic recording-reproducing device

Claim 1

A magnetic recording and reproducing device capable of repeated reproduction, particularly for use in a teaching machine, comprising in combination: means for mounting a first exchangeable cassette containing therein a magnetic master tape, on which a plurality of teaching material units are pre-recorded, the space bewteen the beginning of one unit and the beginning of the next succeeding unit being substantially constant; first drive means for driving said master tape having a pinch roller and a first capstan driven by a drive source, said pinch roller and said first capstan holding said master tape therebetween and driving the same at a predetermined velocity; means for mounting a second exchangeable cassette containing therein an endless magnetic recording and reproducing medium having a recording track of predetermined length; first means for reproducing said teaching material units prerecorded on said master tape onto said endless magnetic recording medium including a first magnetic head and a second magnetic head corresponding to the recording tracks of said master tape and said endless magnetic recording medium, respectively; second drive means for driving said endless magnetic recording medium having a second capstan driven by said drive source at a predetermined velocity so that said endless magnetic recording medium completes one revolution in time corresponding to the time between the beginnings of succeeding teaching units on the master tape; means for removably and exchangeably holding said second cassette in operative position and for urging said second magnetic head and said second capstan into contact with said magnetic recording medium in said second cassette: second means for reproducing said teaching material unit recorded on said endless magnetic recording medium; control means for selectively moving both said first and second drive means or the second drive means alone into operative position, said control means including a first actuating member for Actuating said first drive means, a second actuating member for actuating said second drive means, a play key for simultaneously displacing both actuating members, and a repeat key for displacing said second actuating member alone, said first means for reproducing said teaching material units further including a high-frequency oscillator, an erase head opposed to said second cassette and disposed upstream of said second magnetic head with respect to the direction of movement of said magnetic recording medium in said second cassette, switching means closeable in response to displacement of said second actuating member to switch the reproducing means into operation, said erase head being connected with the output of said high-frequency oscillator through said switching means, and a power supply circuit for operating said high-frequency oscillator when said second cassette is in its operative position.