Magnetic recording and/or reproducing apparatus

Claim 2

Magnetic tape apparatus comprising a tape guide drum having at least one associated rotary magnetic head movable in a circular path substantially coinciding with the periphery of said drum, movable tape guide means engageable with a magnetic tape between supply and take-up reels on which the tape is wound and being operable to withdraw said tape from said reels and to dispose the withdrawn tape in a path having a first section along a part of which the tape is wrapped about at least a portion of said periphery of the drum for the recording and reproducing of an information signal in the tape by said rotary head and a second return section that extends substantially along said first section and is spaced from the latter, at least one stationary magnetic head positioned alongside one of said first and second sections of the tape path and emitting magnetic flux to act on the tape in said one path section, shielding means movable from a normal inoperative position to an operative position in response to operation of said tape guide means, said shielding means, in said inoperative position thereof, being spaced from said path at the location of said stationary head to avoid interference with the disposition of the tape in said path by operation of said tape guide means, and said shielding means, in said operative position thereof, being interposed between said stationary magnetic head and the other of said tape path sections for shielding the tape in said other path section from said magnetic flux emitted by said stationary head.

Claim 3

The magnetic tape apparatus as claimed in claim 1, wherein said tape guide means comprises: A. At least one tape engaging member for drawing said magnetic tape from said supply and take-up reels; and B. A ring-like supporter revolving around said tape guide drum, said shielding means being shifted from said inoperative position to said operative position by said ring-like supporter.

Claim 4

The magnetic tape apparatus as claimed in claim 2, wherein said shielding means comprises: A. A movable plate positioned in front of said stationary magnetic head; and B. Biasing means for moving said movable plate away from the front of said stationary magnetic head, said movable plate being held in front of said stationary magnetic head by the supporter of said tape guide means against said biasing means.

Claim 5

The magnetic tape apparatus as claimed in claim 1, wherein said shielding means comprises: A. A shield plate pivotally mounted in front of said stationary magnetic head; B. First biasing means for retaining said shield plate in opposing relation to said stationary magnetic head; and C. Second biasing means having a greater force than said first biasing force for pulling said shield plate away from said stationary magnetic head, said shield plate being brought by said first biasing means to the front of said stationary magnetic head in response to the turning of said tape guide means against the force of said second biasing means.

Claim 6

The magnetic tape apparatus as claimed in claim 4, wherein said tape guide means comprises: A. At least one tape engaging member for drawing said magnetic tape from said supply and take-up reel; B. A supporter carrying said tape engaging member and turning around said tape guide drum; and C. A pin mounted on said supporter for controlling said second biasing means.

Claim 7

The magnetic tape apparatus as claimed in claim 1, wherein said shielding means is carried by said tape guide means, and said tape guide means comprises: A. At least one tape engaging member for drawing said magnetic tape from said supply and take-up reels; and B. A supporter carrying said tape engaging member and revolving around said tape guide drum.

Claim 8

The magnetiC tape apparatus as claimed in claim 6, wherein said shielding means is a sheet of magnetic material.

Claim 9

The magnetic tape apparatus as claimed in claim 6, wherein the supporter of said tape guide means further includes means for driving said magnetic tape, said shielding means being carried by said driving means.

Claim 10

The magnetic tape apparatus as claimed in claim 1, wherein said stationary magnetic head records and reproduces an audio signal on said magnetic tape.

Claim 11

The magnetic tape apparatus as claimed in claim 1, wherein said stationary magnetic head records and reproduces a control signal on said magnetic tape.

Claim 12

The magnetic tape apparatus as claimed in claim 1, wherein said stationary magnetic head erases a signal recorded on said magnetic tape.

Claim 13

Magnetic tape apparatus comprising a tape guide drum having at least one associated rotary magnetic head movable in a circular path substantially coinciding with the periphery of said drum, movable tape guide means engageable with a magnetic tape between supply and take-up reels on which the tape is wound and being operable to withdraw said tape from the reels and to dispose the withdrawn tape in a path having a first section along a part of which the tape is wrapped about at least a portion of said periphery of the drum for the recording and reproducing of an information signal in the tape by said rotary head and a second return section that extends substantially along said first section and is spaced from the latter, first and second stationary magnetic heads each positioned alongside one of said first and second sections of the tape path and emitting magnetic flux to act on the tape in said one path section adjacent each of said stationary magnetic heads, first and second shielding means respectively associated with said first and second stationary heads and being jointly movable from respective normal inoperative positions to respective operative positions in response to operation of said tape guide means, each of said first and second shielding means, in said inoperative position thereof, being spaced from said path at the location of the respective stationary head to avoid interference with the disposition of the tape in said path by the operation of said tape guide means, and each of said first and second shielding means, in said operative position thereof, being interposed between the respective stationary head and the other of said tape path sections for shielding the tape in said other path section from the magnetic flux emitted by said first and second stationary heads.

Claim 14

Magnetic tape apparatus comprising a tape guide drum having at least one associated rotary magnetic head movable in a circular path substantially coinciding with the periphery of said drum, movable tape guide means engageable with a magnetic tape between supply and take-up reels on which the tape is wound and being operable to withdraw said tape from the reels and to dispose the withdrawn tape in a path having a first section along a part of which the tape is wrapped about at least a portion of said periphery of the drum for the recording and reproducing of an information signal in the tape by said rotary head and a second return section that extends substantially along said first section and is spaced from the latter, first and second stationary magnetic heads each positioned alongside one of said first and second sections of the tape path and emitting magnetic flux to act on the tape in said one path section adjacent each of said stationary magnetic heads, first and second shielding means respectively associated with said first and second stationary heads and being jointly movable from respective normal inoperative positions to respective operative positions in response to operation of said tape guide means, each of said first and second shielding means, in said inoperative position thereof, being spaced from said path at the location of the respective stationary head to avoid interference with the disposition of the tape in said path by the operation of said tape guide means, and each of said first and second shielding means, in said operative position thereof, being interposed between the respective stationary head and the other of said tape path sections for shielding the tape in said other path section from the magnetic flux emitted by said first and second stationary heads.

Claim 15

The magnetic tape apparatus as claimed in claim 12, wherein said first shielding means comprises: A. A plate pivotally mounted in front of said first stationary magnetic head; and B. Biasing means for pulling said plate away from the front of said first stationary magnetic head, said plate being brought by said tape guide means to the front of said first stationary magnetic head against said biasing means.

Claim 16

The magnetic tape apparatus as claimed in claim 12, wherein said second shielding means is carried by said tape guide means, and said tape guide means comprises: A. At least one tape engaging member for drawing said magnetic tape from said supply and take-up reels; and B. A supporter carrying said tape engaging member and turning around said tape guide drum, said second shielding means being brought to the front of said second stationary magnetic head when said supporter is brought to a predetermined position.