Method and apparatus for measuring tape speed

Claim 2

Apparatus for measuring the speed of a magnetic medium comprising: a magnetic head having a pair of legs defining a nonmagnetic gap; a write winding operatively coupled to a first one of said legs; a read winding operatively coupled to the second of said legs; and circuit means interconnecting the read winding and the write winding for detecting a magnetic transition as the magnetic medium is moved relative to the nonmagnetic gap and for recording a magnetic transition on the medium responsive to the detection of a magnetic transition by the read winding.

Claim 3

Apparatus according to claim 1 including means for locating the nonmagnetic gap in a magnetic recording position relative to the medium whereby timing signals may be recorded and detected as the medium is moved relative to the gap.

Claim 4

moving the medium across the gap defined by the head;

Claim 5

moving the medium across the gap defined by the head;

Claim 6

detecting the magnetic transition as it moves through a predetermined position relative to the gap by the same transducer;

Claim 7

detecting the magnetic transition as it moves through a predetermined position relative to the gap by the same transducer;

Claim 8

Apparatus according to claim 2 including a display device connected to the circuit means for providing an indication of the speed of the magnetic medium.

Claim 9

Apparatus according to claim 2 wherein said circuit means includes first means connected to the write winding for recording a magnetic transition on the medium; second means connected to the read winding for detecting the magnetic transition as the medium is moved relative to the gap, an input to said first means being coupled to an output of said second means whereby said first means is energized responsive to an ouTput from said second means.

Claim 10

measuring the time elapsed between the production and the subsequent detection of the magnetic transition; and

Claim 11

measuring the time elapsed between the production and the subsequent detection of the magnetic transition; and

Claim 12

converting said time measurement into an indication of the speed of the medium.

Claim 13

converting said time measurement into an indication of the speed of the medium.

Claim 14

Apparatus according to claim 4 wherein the first means is a signal generator for generating a pulse of a duration which is short relative to the time for the magnetic medium to move a predetermined distance equal to the width of the nonmagnetic gap.

Claim 15

Apparatus according to claim 5 wherein the second means is a pulse peak detector and amplifier for detecting the passage of the magnetic transition through the center of the nonmagnetic gap and transmitting an energizing signal to the signal generator responsive to said detection.

Claim 16

Apparatus according to claim 2 including a pair of magnetic transducers, each transducer having a write winding and a read winding, respectively, one of said transducers being positioned in a recording relationship with the magnetic recording medium and the second transducer being positioned in a nonrecording relationship relative to the medium, the two write windings being electrically connected and the two read windings being electrically connected, said pair of interconnected write windings and read windings being wound in the same direction, respectively, one of said pair of interconnected windings being connected in series aiding relationship and the second of said pair of interconnected windings being connected in a series opposing circuit relationship.

Claim 17

Apparatus according to claim 2 including a pair of magnetic transducers, each transducer having a write winding and a read winding, respectively, one of said transducers being positioned in a recording relationship with the magnetic recording medium and the second transducer being positioned in a nonrecording relationship relative to the medium, the two write windings being electrically connected and the two read windings being electrically connected, the pair of interconnected write windings and read windings being connected in a series aiding circuit relationship, respectively, one winding of one of said pair of interconnected windings being wound in the opposite direction to that of its interconnected winding, the remaining pair of said interconnected windings being wound in the same direction.

Claim 20

A method according to claim 9 including the step of transmitting the detected signal to circuitry for applying pulses to the magnetic transducer for producing a subsequent magnetic transition on the magnetic medium.

Claim 21

A method according to claim 10 wherein the magnetic medium is a tape having a magnetic film imposed on one side thereof including the step of moving the tape in alignment with the length of the nonmagnetic gap.

Claim 22

A method according to claim 10 wherein the magnetic medium is a disc having a magnetic oxide film imposed on one side thereof including the step of rotating the disc relative to the nonmagnetic gap.

Claim 23

A method according to claim 10 wherein the converting step includes the step of transmitting the time measurement to a display apparatus for producing visible indications of the speed of the medium.

Claim 24

A method according to claim 10 including the step of limiting the pulses applied to the magnetic transducer to a duration which is small relative to the duration of time for the magnetic medium to move a distance corresponding to the length of the nonmagnetic gap.

Claim 25

A tape speed monitor comprising: a magNetic core having a first and second side and a recording gap defined by the two sides of the core; a magnetic recording tape located in recording relationship relative to the gap; a first winding inductively coupled to the first side of the core; a signal generator for writing a signal on the tape coupled to the first winding; a second winding inductively coupled to the second side of the core; a peak detector-amplifier coupled to the second winding for reading and amplifying a signal recorded on the tape; means connecting the output of the detector-amplifier to the input of the signal generator such that a signal written on the tape by the generator subsequently induces a signal in the second winding, the peak of said induced signal causing the detector-amplifier to apply a succeeding pulse to the input of the generator; and means for monitoring and translating the pulses from the detector-amplifier to the signal generator into an indication of the instantaneous speed of the magnetic tape.

Claim 26

A tape speed monitor comprising: a magNetic core having a first and second side and a recording gap defined by the two sides of the core; a magnetic recording tape located in recording relationship relative to the gap; a first winding inductively coupled to the first side of the core; a signal generator for writing a signal on the tape coupled to the first winding; a second winding inductively coupled to the second side of the core; a peak detector-amplifier coupled to the second winding for reading and amplifying a signal recorded on the tape; means connecting the output of the detector-amplifier to the input of the signal generator such that a signal written on the tape by the generator subsequently induces a signal in the second winding, the peak of said induced signal causing the detector-amplifier to apply a succeeding pulse to the input of the generator; and means for monitoring and translating the pulses from the detector-amplifier to the signal generator into an indication of the instantaneous speed of the magnetic tape.

Claim 27

Apparatus for indicating the speed of a magnetic medium comprising: a magnetic head having a core and read and write windings thereon, the core having a gap therein which is positionable adjacent the magnetic medium; means responsive to a pulse signal in said read winding for applying a pulse signal in said write winding causing a magnetic signal in said gap for recording on such magnetic medium.

Claim 28

Apparatus for indicating the speed of a magnetic medium comprising: a magnetic head having a core and read and write windings thereon, the core having a gap therein which is positionable adjacent the magnetic medium; means responsive to a pulse signal in said read winding for applying a pulse signal in said write winding causing a magnetic signal in said gap for recording on such magnetic medium.

Claim 29

Apparatus according to claim 16 comprising means for providing a signal indicative of the time duration between pulses read by said read winding.

Claim 30

Apparatus according to claim 16 wherein the duration of said pulse signal formed by said pulse applying means is substantially less than the time for a point on such medium to traverse said gap.

Claim 31

Apparatus according to claim 18 wherein said pulse responsive means comprises a first circuit for sensing and amplifying the signal in said read winding and producing a predetermined output signal and a second circuit responsive to the predetermined output signal for producing said pulse signal in said write winding.