US3906299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for rapid braking of magnetic tape
Assignee: Grundig EMV Elektromechanische Versuchsanstalt Max Grundig GmbH
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Filing: 1974-03-21
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Granted: 1975-09-16
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Expires: 1994-03-21
Abstract
Abstract An arrangement is provided for the rapid braking of magnetic tapes. The apparatus includes first and second motors adapted for driving and being interconnected through a magnetic tape, the motors being adapted for driving the tape in opposite directions and being further adapted for being switched between on and off conditions. A source of voltage is provided to operate the motors. First and second electronic switches connect the source selectively and respectively to the first and second motors. Further electronic switches interconnect the first motor with the second electronic switch and the second motor with the first electronic switch. A mechanical switch arrangement is provided for controlling the first and second electronic switches. Each motor upon being switched from on to off condition is capable of generating a voltage for a limited period of time which operates through the further electronic switches and the first and second electronic switches to switch on the other of the motors whereby the tape is braked. A delay arrangement is provided which is coupled to the further electronic switches for extending the period of time through which the braking operation is effected. According to one embodiment, a memory assembly is provided for effectively storing the last direction of tape movement and operating to prevent undesired feedback between the motors.
Inventors
- 👤 Rainer Mittelstaedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:49
CPC Classifications
H; H02; H02P; H02P3/00; G; G11; G11B; G11B15/00; G11B15/18; G11B15/22; G11B15/46; G11B15/48; G11B5/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
Apparatus for the rapid braking of a magnetic tape, when a rapid tape transport switch is switched off in a magnetic tape device including separate and interchangeably operable directcurrent tape winding motors one of which drives the tape onto a take-up reel and the other of which is an idling motor which is driven through the tape, and wherein the last idling motor is activated in opposite direction until the tape stops, when the last operated motor is switched off, said apparatus comprising first and second transistors including base-emitter circuits respectively coupled to said motors, and logical connecting circuit means, each said transistor being controlled as to its conductivity by an operating voltage supplied by the associated motor, each said transistor including a collector having a potential adapted to excite the driven motor through said logical connecting circuit when the drive motor is switched off for as long as the induced EMF supplied by the switched off motor exceeds a prescribed value.
Claim 2
Dependent Claim
162 words
Apparatus for the rapid braking of a magnetic tape, when a rapid tape transport switch is switched off in a magnetic tape device including separate and interchangeably operable directcurrent tape winding motors one of which drives the tape onto a take-up reel and the other of which is an idling motor which is driven through the tape, and wherein the last idling motor is activated in opposite direction until the tape stops, when the last operated motor is switched off, said apparatus comprising first and second transistors including base-emitter circuits respectively coupled to said motors, and logical connecting circuit means, each said transistor being controlled as to its conductivity by an operating voltage supplied by the associated motor, each said transistor including a collector having a potential adapted to excite the driven motor through said logical connecting circuit when the drive motor is switched off for as long as the induced EMF supplied by the switched off motor exceeds a prescribed value.
Claim 3
Dependent Claim
29 words
Apparatus as claimed in claim 1 comprising delay means coupled to respective of the transistors and controlled by the motor voltage to maintain the effect of the motor voltage.
Claim 4
Dependent Claim
38 words
Apparatus as claimed in claim 1 comprising intermediate memory means for effectively storing the last activated direction of rapid tape transport, said storage means being coupled to the logical coupling circuit means to prevent feedback between the motors.
Claim 5
Dependent Claim
158 words
Apparatus comprising first and second motors adapted for driving and being interconnected through a magnetic tape, said motors being adapted for driving the tape in opposite directions and being further adapted for being switched between on and off conditions, a source of voltage to operate said motors, first and second electronic switch means for connecting said source selectively and respectively to said first and second motors, further electronic switch means for interconnecting the first motor with said second electronic switch means and said second motor with said first electronic switch means, and mechanical switch means for controlling said first and second electronic switch means, each said motor, upon being switched from on to off condition, being capable of generating a voltage for a limited period of time which operates through said further electronic switch means and one of said first and second electronic switch means to switch on the other of said motors whereby the tape is braked.
Claim 6
Dependent Claim
158 words
Apparatus comprising first and second motors adapted for driving and being interconnected through a magnetic tape, said motors being adapted for driving the tape in opposite directions and being further adapted for being switched between on and off conditions, a source of voltage to operate said motors, first and second electronic switch means for connecting said source selectively and respectively to said first and second motors, further electronic switch means for interconnecting the first motor with said second electronic switch means and said second motor with said first electronic switch means, and mechanical switch means for controlling said first and second electronic switch means, each said motor, upon being switched from on to off condition, being capable of generating a voltage for a limited period of time which operates through said further electronic switch means and one of said first and second electronic switch means to switch on the other of said motors whereby the tape is braked.
Claim 7
Dependent Claim
52 words
Apparatus as claimed in claim 4 comprising first and second NOR-gates coupling said further electronic switch means to said second electronic switch means and third and fourth NOR-gates coupling said further electronic switch means to said first electronic switch means, said NOR-gates being coupled by said mechanical switch means to said source.
Claim 8
Dependent Claim
28 words
Apparatus as claimed in claim 5 comprising delay means coupled to said further electronic switch means and to selected of said NOR-gates for extending said period of time.
Claim 9
Dependent Claim
30 words
Apparatus as claimed in claim 6 comprising memory means for effectively storing the last direction of tape movement and connected to said NOR-gates to prevent undesired feedback between said motors.
Claim 10
Dependent Claim
39 words
Apparatus as claimed in claim 6 wherein the mechanical switch means includes first and second switches for tape advance and rewide respectively, said switches being respectively coupled to said first and third and to said second and fourth NOR-gates.
References Cited (Backward Citations)
US3254287A
Cited
US3704401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |