US3926513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bidirectional web medium drive
Assignee: Computer Specialties Corp
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Filing: 1974-05-09
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Granted: 1975-12-16
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Expires: 1994-05-09
Abstract
Abstract A bidirectional web medium drive for moving a web of material such as a roll of microfilm between two reels consisting of a pair of reversible motors coupled through irreversible drives to corresponding spindles which receive and support each of the film reels. A torque controller is coupled to one of the motors for applying a constant output torque to that motor while a variable speed controller is coupled to the other motor for controlling the output speed of that motor. In one embodiment, a switch is provided so that when the switch is in a first position, the torque controller is connected to one of the motors to apply a constant torque to its spindle so that its associated reel becomes the take-up reel while the speed controller is connected to the other motor so that its reel becomes the supply reel and both motors rotate in the same direction. When the switch is thrown into a second position, the outputs of the torque controller and speed controller are interchanged with respect to the motors, and the polarity of the motors is reversed so that the film moves in the opposite direction and the function of the reels are interchanged. In another embodiment, the switch is eliminated so that the motors are directly connected to the controllers and the speed controller is converted to a torque controller while the torque controller is converted to a speed controller and the polarity applied to the inputs of the motors is reversed so that the supply and take-up functions can be reversed.
Inventors
- 👤 Edward S Silver
- 👤 Robert E Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/10; G03B21/11; G03B21/111; G03B21/113
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
265 words
A bidirectional web medium drive for moving a web of material between two reels comprising: first and second reversible motors; drive means each having an input coupled to the output of each of said motors, and an output which is restricted from rotation unless the input is driven; first and second spindles each connected to each output of said irreversible drive means, said spindles adapted to receive and support the reels; a torque controller coupled to one of said motors for maintaining an output torque to that motor; a variable speed controller coupled to the other of said motors for controlling the output speed of that motor; and switch means coupled to said torque and speed controllers for running said first and second motors in the same direction, said switch means having at least two positions so that when said switch means is in a first position, the torque controller is connected to said first motor to apply a torque to said first spindle causing its associated reel to be the web take-up reel, and the speed controller is connected to said second motor to apply a selected speed to the second spindle causing its associated reel to be the web supply reel, and when said switch means is in a second position, said torque controller is connected to said second motor and said speed controller is connected to said first motor and the direction of rotation of said motors is reversed so that the reel on said first spindle becomes the supply reel and the reel on said second spindle becomes the take-up reel.
Claim 2
Dependent Claim
265 words
A bidirectional web medium drive for moving a web of material between two reels comprising: first and second reversible motors; drive means each having an input coupled to the output of each of said motors, and an output which is restricted from rotation unless the input is driven; first and second spindles each connected to each output of said irreversible drive means, said spindles adapted to receive and support the reels; a torque controller coupled to one of said motors for maintaining an output torque to that motor; a variable speed controller coupled to the other of said motors for controlling the output speed of that motor; and switch means coupled to said torque and speed controllers for running said first and second motors in the same direction, said switch means having at least two positions so that when said switch means is in a first position, the torque controller is connected to said first motor to apply a torque to said first spindle causing its associated reel to be the web take-up reel, and the speed controller is connected to said second motor to apply a selected speed to the second spindle causing its associated reel to be the web supply reel, and when said switch means is in a second position, said torque controller is connected to said second motor and said speed controller is connected to said first motor and the direction of rotation of said motors is reversed so that the reel on said first spindle becomes the supply reel and the reel on said second spindle becomes the take-up reel.
Claim 3
Dependent Claim
54 words
The web medium drive as recited in claim 1 additionally comprising at least two spaced-apart idler rollers pivotably disposed between the reels for contact with one side of the web so that when a torque is applied to the web by the take-up reel, the web is held substantially planar between said idler rollers.
Claim 4
Dependent Claim
51 words
The web medium as recited in claim 1 wherein said torque controller comprises current sensing means coupled to its output, and means responsive to said current sensing means for limiting the speed of said motor coupled to the take-up reel until a desired preset output torque of said motor is reached.
Claim 5
Dependent Claim
37 words
The web medium drive as recited in claim 3 wherein said current sensing means comprises a resistor connected in series with the armature of said motor and, an amplifier responsive to the voltage drop across said resistor.
Claim 6
Dependent Claim
70 words
The web medium drive as recited in claim 1 comprising release switching means for limiting the output of said torque controller so that the torque of the take-up motor is reduced to zero when the speed set on said speed controller is at zero magnitude, and means for applying a small speed to said speed controller so that its associated supply reel will release the tension on the film web.
Claim 7
Dependent Claim
59 words
The web medium drive as recited in claim 5 wherein said means for applying a small speed to said speed controller comprises a resistor connected in series with said variable speed controller, and a normally closed shunt switch connected across said resistor so that the addition of said resistance to said sPeed controller causes the supply reel to advance.
Claim 8
Dependent Claim
66 words
The web medium drive as recited in claim 1 comprising reverse switching means for limiting the output of said torque controller so that the torque of the take-up motor is reduced to zero when the speed set on said speed controller is at zero magnitude, and actuating said switch means coupled to said speed and torque controllers to throw said switch means into its second position.
Claim 9
Dependent Claim
82 words
The web medium drive as recited in claim 7 wherein said reverse switching means comprises a switch coupled to said switch means, a relay coil connected to said switch when said switch means is set at an ''''off'''' position, and a normally open reverse switch coupled to a power source so that when said reverse switch is depressed, said relay coil is energized to apply said power to said switch means so that said switch means is thrown into its second position.
Claim 10
Dependent Claim
292 words
A bidirectional web medium drive for moving a web of material between two reels comprising: first and second reversible motors; drive means each having an input coupled to the output of each of said motors, and an output which is restricted from rotation unless the input is driven; first and second spindles each connected to each output of said irreversible drive means, said spindles adapted to receive and support the reels; a first controller coupled to said first motor and having a torque function and a variable speed function; a second controller coupled to said second motor and having a torque function and variable speed function; so that in a first operating mode, said first controller being adjusted so that its speed function is set at a maximum and its torque function is set to a level so that the reel coupled to said first motor becomes a take-up reel having a torque to maintain the web in tension, and said second controller being adjusted so that its torque function is set to a limited low level and its speed function is variable, so that the reel coupled to said second motor becomes a supply reel under variable speed control, and in a second operating mode, said first controller is adjusted so that its speed function is variable and its torque function is set to a limited low level and said second controller is adjusted so that its speed function is set at a maximum and its torque function is set to a level to maintain the web in tension so that the functions of said supply and take-up reels are interchanged, and means for reversing the direction of rotation of said first and second motors responsive to said second operating mode.
Claim 11
Dependent Claim
292 words
A bidirectional web medium drive for moving a web of material between two reels comprising: first and second reversible motors; drive means each having an input coupled to the output of each of said motors, and an output which is restricted from rotation unless the input is driven; first and second spindles each connected to each output of said irreversible drive means, said spindles adapted to receive and support the reels; a first controller coupled to said first motor and having a torque function and a variable speed function; a second controller coupled to said second motor and having a torque function and variable speed function; so that in a first operating mode, said first controller being adjusted so that its speed function is set at a maximum and its torque function is set to a level so that the reel coupled to said first motor becomes a take-up reel having a torque to maintain the web in tension, and said second controller being adjusted so that its torque function is set to a limited low level and its speed function is variable, so that the reel coupled to said second motor becomes a supply reel under variable speed control, and in a second operating mode, said first controller is adjusted so that its speed function is variable and its torque function is set to a limited low level and said second controller is adjusted so that its speed function is set at a maximum and its torque function is set to a level to maintain the web in tension so that the functions of said supply and take-up reels are interchanged, and means for reversing the direction of rotation of said first and second motors responsive to said second operating mode.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |