Device for controlling tape drive in tape recorder of magazine type

Claim 2

In a tape recorder of the magazine type, a device for controlling the tape drive, comprising: a tape magazine having a casing, a pair of through holes in said casing to receive a pair of reel drive shafts with the peripheral edges of said holes being provided with circular projections extending inwardly therefrom, two hubs rotatably disposed in said through holes of said casing and provided with circular recesses on the upper and lower surface thereof to receive said projections, guide rollers securely fixed to said casing, a magnetic tape wound about said hubs through said guide rollers and secured at both ends to said hubs, openings provided in said casing through which said magnetic tape, moving from one of said hubs to the other, is engageable with a magnetic head, and holes to receive a capstan; and a switching means having a contact retractably protruding therefrom which is normally engaged by said casing; some play being provided between said hubs and said circular projections by virtue of the diameter of each of said circular projections being smaller than that of each of said circular recesses to allow relative movement between said hubs and said casing so that when the tape layers wound about one of said hubs have completely run out, said casing is slightly displaced to depress the contact of said switching means to actuate it under the action of the tension imparted to the tape between the hub and the nearer one of guide rollers securely fixed to said casing.

Claim 3

A device for controlling the tape drive according to claim 1, including a pair of reel drive shafts extending into said pair of through holes and immovably engaging said hubs, and in which the tension imparted to said tape as a result of the absence of any tape layers on said tape supply hub causes a rotary movement of said casing relative to said hub, and the rotary movement of said casing imparts the force to actuate said tape drive control means.

Claim 4

In a tape recorder of the magazine type, a device for controlling the tape drive comprising a tape magazine having a casing, two hubs rotatably disposed in said casing, guide rollers securely fixed to said casing, and a magnetic tape wound about said hubs through said guide rollers and secured at both ends to said hubs; means defining openings in said casing through which said magnetic tape, moving from one of said hubs to the other, is engageable with a magnetic head; means defining through holes to receive a capstan and means defining a pari of spaced through holes, the peripheral edges thereof being provided with projections extending inwardly therefrom, said holes being adapted to receive a pair of reel drive shafts, each of said hubs being provided with circular recesses on the upper and lower surface thereof to receive said projections, the diameter of said circular projections being made smaller than that of the circular recesses so that said hubs may have some play to be slightly movable relative to said casing; and tape drive control means adapted to be actuated by the tension imparted to said tape when the layers of said tape wound about one of said hubs have completely run out, and in which said tape drive control means comprises rotatable reel tables engaging the holes in said hubs for mounting said magazine thereon and a pivotal lever having the shaft of one of said reel tables fixedly supported thereon, so that the tension imparted to said tape causes a pivotal movement of said lever thereby to actuate said tape drive control means.

Claim 5

In a tape recorder of the magazine type, a device for controlling the tape drive comprising a tape magazine having a casing, two hubs rotatably disposed in said casing, guide rollers securely fixed to said casing, and a magnetic tape wound about said hubs through said guide rollers and secured at both ends to said hubs; means defining openings in said casing through which said magnetic tape, moving from one of said hubs to the other, is engageable with a magnetic head; means defining through holes to receive a capstan and means defining a pari of spaced through holes, the peripheral edges thereof being provided with projections extending inwardly therefrom, said holes being adapted to receive a pair of reel drive shafts, each of said hubs being provided with circular recesses on the upper and lower surface thereof to receive said projections, the diameter of said circular projections being made smaller than that of the circular recesses so that said hubs may have some play to be slightly movable relative to said casing; and tape drive control means adapted to be actuated by the tension imparted to said tape when the layers of said tape wound about one of said hubs have completely run out, and in which said tape drive control means comprises rotatable reel tables engaging the holes in said hubs for mounting said magazine thereon and a pivotal lever having the shaft of one of said reel tables fixedly supported thereon, so that the tension imparted to said tape causes a pivotal movement of said lever thereby to actuate said tape drive control means.

Claim 6

A device for controlling the tape drive according to claim 3, in which said lever is disposed substantially perpendicularly with respect to the line connecting the shaft of said reel table with the corresponding one of said guide rollers, and said lever is pivoted adjacent to one end thereof to the base plate by means of a pivot pin, said pivot pin pivotally supporting said lever being disposed between the line connecting the center of the shaft of said reel table with the outer peripheral surface of said guide roller and the line tangential to both the outer peripheral surface of said guide roller and the outer peripheral surface of said hub.