US3779485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape transport system and associated controls
Assignee: REDACTRON CORP
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Filing: 1971-08-17
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Granted: 1973-12-18
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Expires: 1991-08-17
Abstract
Abstract For the reversible driving of a magnetic tape casette, two spindles are selectively connected by electromagnetic clutches to a pulley system driven by a constant speed motor such that one spindle is driven while the other is free-wheeling. Inertia damping discs are mounted on the spindles to smooth the response of the free-wheeling spindle to the driven spindle to which the free-wheeling spindle is coupled via the magnetic tape. A braking system engages the discs in the absence of driving of either spindle. A burst of reverse torque is applied to the freewheeling spindle before the tape is completely halted. A leader detection circuit is used to detect the tape ends whereupon rotary power to the driven spindle is reduced.
Inventors
- 👤 E Wolf
- 👤 E Lau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:21
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/50; G11B15/02; G11B15/05; G11B15/06; G11B15/08; G11B15/44
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
141 words
A magnetic tape transport apparatus for a device which includes a tape source reel, a tape take-up reel and a tape which is connected between said source reel and take-up reel and which is adapted for being stripped from the source reel and wound upon the take-up reel, said apparatus comprising: a source of rotary power, spindles for supporting said reels, coupling means for selectively coupling said source of rotary power to the spindle supporting said take-up reel so that said tape is wounD on the latter and stripped from the tape source reel, and inertia damping means separate from said coupling means operatively associated with said source reel to smooth the velocity response of the latter to the application of rotary power to the take-up reel, said damping means being coupled by said spindles to said source of rotary power.
Claim 2
Dependent Claim
141 words
A magnetic tape transport apparatus for a device which includes a tape source reel, a tape take-up reel and a tape which is connected between said source reel and take-up reel and which is adapted for being stripped from the source reel and wound upon the take-up reel, said apparatus comprising: a source of rotary power, spindles for supporting said reels, coupling means for selectively coupling said source of rotary power to the spindle supporting said take-up reel so that said tape is wounD on the latter and stripped from the tape source reel, and inertia damping means separate from said coupling means operatively associated with said source reel to smooth the velocity response of the latter to the application of rotary power to the take-up reel, said damping means being coupled by said spindles to said source of rotary power.
Claim 3
Dependent Claim
26 words
Apparatus as claimed in claim 1 comprising brake means to hold the reels against rotation when there is no rotary power applied to the take-up reel.
Claim 4
Dependent Claim
41 words
Apparatus as claimed in claim 2 comprising detectable means on the ends of the tape coupled to the source reel and detection means to detect said detectable means and to decrease the amount of rotary power supplied to the take-up reel.
Claim 5
Dependent Claim
43 words
Apparatus as claimed in claim 2 comprising command means to control the supply and cut-off of rotary power to said take-up reel and means to supply a temporary reverse torque to the source reel when power to the take-up reel is cut off.
Claim 6
Dependent Claim
25 words
Apparatus as claimed in claim 1, wherein said inertia damping means includes a disc and a slip friction coupling between said disc and source reel.
Claim 7
Dependent Claim
121 words
A drive for a casette which includes two reels and a magnetic tape coupled between the reels, said reels being capable of interchangeably functioning as take-up and supply reels; said device comprising spindles on which said reels are adapted for being mounted, drive means for selectively driving the spindles in opposite rotary directions so that, when one spindle is driven, the other spindle idles, the idling spindle being rotated by the driven spindle to which it is coupled by said reels and tape, and inertia damping means operatively associated with said spindles and effective to smooth the velocity response of the idling spindle upon actuation of the driven spindle, said damping means being coupled by said spindles to said drive means.
Claim 8
Dependent Claim
121 words
A drive for a casette which includes two reels and a magnetic tape coupled between the reels, said reels being capable of interchangeably functioning as take-up and supply reels; said device comprising spindles on which said reels are adapted for being mounted, drive means for selectively driving the spindles in opposite rotary directions so that, when one spindle is driven, the other spindle idles, the idling spindle being rotated by the driven spindle to which it is coupled by said reels and tape, and inertia damping means operatively associated with said spindles and effective to smooth the velocity response of the idling spindle upon actuation of the driven spindle, said damping means being coupled by said spindles to said drive means.
Claim 9
Dependent Claim
43 words
A drive as claimed in claim 6, wherein said inertia damping means includes discs encircling respective of said spindles and auxiliary means frictionally coupling the discs to the spindles to permit relative rotation between the spindles and discs upon acceleration of the spindles.
Claim 10
Dependent Claim
18 words
A drive as claimed in claim 7 comprising brake means for engaging and holding the discs against rotation.
Claim 11
Dependent Claim
36 words
A device as claimed in claim 8, wherein said drive means includes an electric motor, shafts driven in opposite rotary directions by said motor, and electromagnetic clutches selectively coupling respective of the shafts to said spindles.
Claim 12
Dependent Claim
27 words
A device as claimed in claim 8, wherein said auxiliary means comprises friction washers sandwiching the respective discs, and spring means urging the washers against the discs.
Claim 13
Dependent Claim
17 words
A device as claimed in claim 8, wherein the brake means includes caliper brakes engaging the discs.
Claim 14
Dependent Claim
53 words
A device as claimed in claim 9, wherein said drive means further includes a motor pulley driven by said motor, an idler pulley, a belt coupling said pulleys, further pulleys on said shafts, and a further belt passing in serpentine fashion between said further pulleys to drive the latter in opposite rotary directions.
Claim 15
Dependent Claim
32 words
A device as claimed in claim 12, wherein said spindles are mounted in idling relation on said shafts, said clutches including sections respectively coupled in rotative sense to said shafts and spindles.
Claim 16
Dependent Claim
15 words
A device as claimed in claim 13 comprising spring means urging said clutch sections together.
Claim 17
Dependent Claim
16 words
A device as claimed in claim 13 comprising friction rings supporting said discs on said spindles.
Claim 18
Dependent Claim
28 words
A device as claimed in claim 9 comprising means for selectively actuating said clutches and means for releasing said brake means when either of said clutches are actuated.
Claim 19
Dependent Claim
22 words
A device as claimed in claim 16 comprising means for actuating the brake means except when one of the clutches is actuated.
Claim 20
Dependent Claim
28 words
A device as claimed in claim 17 comprising means for temporarily and momentarily actuating the clutch associated with the idling spindle even though the bRake means is actuated.
Claim 21
Dependent Claim
17 words
A device as claimed in claim 18 comprising means to reduce the power of said drive means.
Claim 22
Dependent Claim
31 words
A device as claimed in claim 9, wherein the tape includes leaders coupled to said reels, comprising photoelectric means to detect said leaders and to control said brake means and clutches.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |