US3879756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic drive stop control utilizing motor voltage transients
Assignee: PHI TECHNOLOGIES Inc
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Filing: 1973-03-13
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Granted: 1975-04-22
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Expires: 1993-03-13
Abstract
Abstract Electrical apparatus for use in combination with record transducing apparatus of the type which moves a record medium past a fixed position for operative contact with a record or reproducing transducer, which electrical apparatus is comprised of audio reproducing circuitry as well as predetermined control tone reproducing circuits in coaction with tape drive logic and control circuitry; such tape drive control circuitry particularly including circuits for sensing tape drive condition to derive a signal indicative of proper tape movement which may be utilized to further control selected or numerous ones of operational tape drive functions as exercised through gate circuit control of the various transducing apparatus functions.
Inventors
- 👤 Bell Lawrence R De
- 👤 Jr David D Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:15
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B15/00; G11B15/02; G11B15/18; G11B15/46; G11B27/30; G11B27/3009; G11B2220/00; G11B2220/90
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 words
In record transport apparatus wherein continuous record medium is moved past a transducing position for operative contact with a transducing head, the transport including an electric source and a drive motor energizable to move said record medium, apparatus improvements comprising: means to sense voltage transients in said elect source energizing said drive motor and responsive thereto a varying output signal proportional to the rotational speed of said drive motor; circuit means receiving said output signal and generating a control voltate indication when said output signal is less than a preselected threshold value; and control circuit means controlled in response to said control voltage indication to de-energize said drive motor.
Claim 2
Dependent Claim
109 words
In record transport apparatus wherein continuous record medium is moved past a transducing position for operative contact with a transducing head, the transport including an electric source and a drive motor energizable to move said record medium, apparatus improvements comprising: means to sense voltage transients in said elect source energizing said drive motor and responsive thereto a varying output signal proportional to the rotational speed of said drive motor; circuit means receiving said output signal and generating a control voltate indication when said output signal is less than a preselected threshold value; and control circuit means controlled in response to said control voltage indication to de-energize said drive motor.
Claim 3
Dependent Claim
109 words
In record transport apparatus wherein continuous record medium is moved past a transducing position for operative contact with a transducing head, the transport including an electric source and a drive motor energizable to move said record medium, apparatus improvements comprising: means to sense voltage transients in said elect source energizing said drive motor and responsive thereto a varying output signal proportional to the rotational speed of said drive motor; circuit means receiving said output signal and generating a control voltate indication when said output signal is less than a preselected threshold value; and control circuit means controlled in response to said control voltage indication to de-energize said drive motor.
Claim 4
Dependent Claim
109 words
In record transport apparatus wherein continuous record medium is moved past a transducing position for operative contact with a transducing head, the transport including an electric source and a drive motor energizable to move said record medium, apparatus improvements comprising: means to sense voltage transients in said elect source energizing said drive motor and responsive thereto a varying output signal proportional to the rotational speed of said drive motor; circuit means receiving said output signal and generating a control voltate indication when said output signal is less than a preselected threshold value; and control circuit means controlled in response to said control voltage indication to de-energize said drive motor.
Claim 5
Dependent Claim
33 words
Apparatus as set forth in claim 1 wherein said means to sense voltage transients further includes: integrating means receiving the output signal indication and providinG a time integrated voltage to said circuit means.
Claim 6
Dependent Claim
86 words
Apparatus as set forth in claim 1 which is further characterized to include: chassis support structure integrally sustaining said transport apparatus; control bar means having said transducer head secured thereon, said control bar means being supported across said chassis and pivotally secured thereto for pivotal movement alternatively positioning the transducer head into and out of operative contact with the record medium at said transducing position; drive means energizable to pivot said control bar means; and selective means for connecting said electric source to said drive means.
Claim 7
Dependent Claim
53 words
Apparatus as set forth in claim 1 wherein said control circuit means comprises: gate means having one input connected to said electric source with the output supplying energizing voltage to said drive motor which is enabled by input of said control voltage indication to cease output of energizing voltage to said drive motor.
Claim 8
Dependent Claim
18 words
Apparatus as set forth in claim 1 wherein said drive motor is the record medium forward take-up motor.
Claim 9
Dependent Claim
48 words
Apparatus as set forth in claim 1 which is further characterized to include: a first drive motor providing record medium supply drive; a second drive motor providing capstan drive; and a third drive motor providing forward take-up drive; said sense means being connected to said third drive motor.
Claim 10
Dependent Claim
155 words
Apparatus for recording and playback of tape records which includes transport support structure, plural drive means for supplying record supply, record take-up and capstan drive functions, and transducer means movable into operative engagement with said record, the apparatus further comprising: an electric source selectively connectable to said take-up drive means; first gate means connected between said electric source and said record take-up drive means controlled by a first control input to energize said record take-up drive means; second gate means connected to said electric source and selectively energizable upon receiving a gate input to generate as output said first control input to said first gate means; and circuit means receiving transient voltage input from said take-up drive means connection to said electric source and generating said gate input to said second gate means when the transient voltage input to said circuit means includes more than a pre-set number of voltage transient variations per unit time.
Claim 11
Dependent Claim
155 words
Apparatus for recording and playback of tape records which includes transport support structure, plural drive means for supplying record supply, record take-up and capstan drive functions, and transducer means movable into operative engagement with said record, the apparatus further comprising: an electric source selectively connectable to said take-up drive means; first gate means connected between said electric source and said record take-up drive means controlled by a first control input to energize said record take-up drive means; second gate means connected to said electric source and selectively energizable upon receiving a gate input to generate as output said first control input to said first gate means; and circuit means receiving transient voltage input from said take-up drive means connection to said electric source and generating said gate input to said second gate means when the transient voltage input to said circuit means includes more than a pre-set number of voltage transient variations per unit time.
Claim 12
Dependent Claim
63 words
Apparatus as set forth in claim 7 wherein said circuit means comprises: first transistor means receiving input and conductive in response to said transient voltage input from the take-up drive means; and second transistor means controlled by conduction of said first transistor means to be maintained conductive and provide low voltage output for input to said second gate means as said gate input
Claim 13
Dependent Claim
34 words
Apparatus as set forth in claim 7 which is further characterized to include: third gate means connected to said electric source and controlled by said first control input to energize said capstan drive means.
Claim 14
Dependent Claim
90 words
Apparatus as set forth in claim 7 which is further characterized to include: a control tone signal of predetermined frequency periodically record on said tape record; amplifier circuitry receiving input of said control tone signal from said transducer means to generate a control stop signal output; and stop gate means receiving as input said first control input and actuated by input of said control stop signal to reverse the stop gate means voltage output as connected in circuit with said first control input thereby to reverse said first gate means.
Claim 15
Dependent Claim
66 words
Apparatus as set forth in claim 10 which is further characterized to include: restart switch means in series with resistance/capacitance time delay means and actuatable to momentarily ground a latch gate input; and latching gate means receiving said latch gate input and stop gate means output and Energized upon actuation of said restart switch means to maintain said second gate means generating said first control input.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |