Magnetic tape tension control system for magnetic recording and reproducing apparatus having dual capstans

Claim 2

A magnetic tape tension control system for magnetic recording and reproducing apparatus comprising a single capstan motor, means comprising two capstans engaging a magnetic tape for at all times driving said magnetic tape, information signal recording and reproducing means located between said two capstans for recording on and reproducing from said magnetic tape, means including a first reel motor and a supply reel normally rotating in a first direction to transport magnetic tape from said supply reel in a normal direction of tape movement, means comprising a second reel motor and a second reel normally rotating in said first direction to take up said magnetic tape on said second reel responsive to the tape movement in the normal direction, transmission means for respectively transmitting the rotational torque of said capstan motor to said two capstans, said transmission means including means for increasing the peripheral speed of the rotary shaft of the capstan on said second reel side as compared to the peripheral speed of the rotary shaft of the capstan on said supply reel side so as to apply a predetermined tension to a portion of the magnetic tape disposed between said two capstans when the tape movement is in the normal direction, switch means for operating said transmission means to change over the direction of the rotation of said capstan motor so as to cause said magnetic tape to move in either the normal direction or the reverse direction, and means responsive to the changeover of the capstan motor rotation and the reverse in direction by said switch means for increasing the voltage applied to said first reel motor as compared to the voltage applied to said first reel motor during the tape movement in the normal direction so as to keep constant the tension of the portion of the magnetic tape disposed between said two capstans regardless of the direction of the magnetic tape movement.

Claim 3

The magnetic tape tension control system as defined in claim 1 wherein aid information signal recording and reproducing means comprises a guide drum, means for moving said magnetic tape around the outer periphery of said drum for a distance corresponding to over one-half the circumference of the guide drum, said tape having an oblique wrap about said circumference with respect to the drum axis, said guide drum having built-in rotary magnetic heads for recording and reproducing video signals or the like.

Claim 4

A magnetic tape tension control system for magnetic recording and reproducing apparatus comprising a single capstan motor, means comprising two capstans engaging a magnetic tape for at all times driving said magnetic tape, information signal recording and reproducing means located between said two capstans for recording on and reproducing from said magnetic tape, means including a first reel motor and a supply reel Normally rotating in a first direction to transport a magnetic tape from said supply reel in a normal direction of tape movement, means comprising a second reel motor and a second reel normally rotating in a first direction to take up said magnetic tape on said second reel responsive to the tape movement in the normal direction, transmission means for respectively transmitting the rotational torque of said capstan motor to said two capstans, said transmission means including means for increasing the peripheral speed of the rotary shaft of the capstan on said second reel side as compared to the peripheral speed of the rotary shaft of the capstan on said supply reel side so as to apply a predetermined tension to a portion of the magnetic tape disposed between said two capstans when the tape movement is in the normal direction, switch means for operating said transmission means to change over the direction of the rotation of said capstan motor so as to cause said magnetic tape to move in either the normal direction or the reverse direction, voltage-changing means responsive to the changeover of the capstan motor rotation and the reverse in direction by said switch means for changing the voltage applied to said first and second reel motors as compared to the voltage applied to said first and second reel motors during the tape movement in the normal direction wherein said voltage-changing means applies a greater voltage to said first reel motor than to said second reel motor so as to keep constant the tension of the portion of the magnetic tape disposed between said two capstans regardless of the direction of the magnetic tape movement.

Claim 5

A magnetic tape tension control system for magnetic recording and reproducing apparatus comprising a single capstan motor, means comprising two capstans engaging a magnetic tape for at all times driving said magnetic tape, information signal recording and reproducing means located between said two capstans for recording on and reproducing from said magnetic tape, means including a first reel motor and a supply reel Normally rotating in a first direction to transport a magnetic tape from said supply reel in a normal direction of tape movement, means comprising a second reel motor and a second reel normally rotating in a first direction to take up said magnetic tape on said second reel responsive to the tape movement in the normal direction, transmission means for respectively transmitting the rotational torque of said capstan motor to said two capstans, said transmission means including means for increasing the peripheral speed of the rotary shaft of the capstan on said second reel side as compared to the peripheral speed of the rotary shaft of the capstan on said supply reel side so as to apply a predetermined tension to a portion of the magnetic tape disposed between said two capstans when the tape movement is in the normal direction, switch means for operating said transmission means to change over the direction of the rotation of said capstan motor so as to cause said magnetic tape to move in either the normal direction or the reverse direction, voltage-changing means responsive to the changeover of the capstan motor rotation and the reverse in direction by said switch means for changing the voltage applied to said first and second reel motors as compared to the voltage applied to said first and second reel motors during the tape movement in the normal direction wherein said voltage-changing means applies a greater voltage to said first reel motor than to said second reel motor so as to keep constant the tension of the portion of the magnetic tape disposed between said two capstans regardless of the direction of the magnetic tape movement.

Claim 6

The magnetic tape tension control system as defined in claim 3 wherein said voltage increase means comprises a first series circuit including said first reel motor and a plurality of resistors, as second series circuit including said second reel motor and a plurality of resistors, means for applying a voltage across said first and second series circuits respectively, and means responsive to the changeover of the capstan motor rotation to the reverse direction for respectively short circuiting a portion of series resistors of said first and second series circuits.

Claim 7

The magnetic tape tension control system as defined in claim 4 wherein resistance values of the short-circuited portion of said first series circuit are larger than resistance values of the short-circuited portion of said second series circuit.