Patent US3716177A successfully refreshed from Google Patents.
US3716177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Film transport
Assignee: Cutler Hammer Inc
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Filing: 1971-04-23
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Granted: 1973-02-13
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Expires: 1991-04-23
Abstract
Abstract Film is guided in a path that extends across two spaced apart capstans in non-slipping contact therewith. A buffer disposed between a supply reel and one capstan, and a buffer disposed between a pickup reel and the other capstan serve to isolate the film between the capstans from tension variations imposed by the reel drive systems. The capstans are driven by motors that are electrically connected in series. The motors are actuated by a control signal representative of the deviation between the actual film transport speed and a desired value thereof. The torque responses of the motors and the resultant moments of inertia of the motors and their respective capstans are matched to each other. The film bears a coating of magnetic material suitable for recording sound signals and a recording station is disposed between the capstans in recording proximity to the magnetic coating.
Inventors
- 👤 M Leavitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:32
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/68; H02P5/685; G; G03; G03B; G03B21/00; G03B21/14; G03B21/32; G03B21/43; G11; G11B; G11B15/00; G11B15/56; G11B15/58
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
188 words
A film transport system comprising: a length of film; a first capstan; a second capstan; a work station communicating with the film at a point between the first and second capstans; a first motor mechanically coupled to the first capstan to rotate the first capstan, the first motor developing a torque responsive to an applied excitation signal; a second motor mechanically coupled to the second capstan to rotate the second capstan in the same direction as the first capstan, the second motor developing a torque responsive to an applIed excitation signal; the torque responses of the motors to their respective applied excitation signals being matched to each other and the resultant moments of inertia associated with the capstans being matched to each other; means for guiding the length of film across the first and second capstans in non-slipping engagement therewith to transport the film past the work station from the first capstan to the second capstan responsive to the rotation of the capstans; and means for applying the same excitation signal to the first and second motors to apply the same torque to the first and second capstans.
Claim 2
Dependent Claim
188 words
A film transport system comprising: a length of film; a first capstan; a second capstan; a work station communicating with the film at a point between the first and second capstans; a first motor mechanically coupled to the first capstan to rotate the first capstan, the first motor developing a torque responsive to an applied excitation signal; a second motor mechanically coupled to the second capstan to rotate the second capstan in the same direction as the first capstan, the second motor developing a torque responsive to an applIed excitation signal; the torque responses of the motors to their respective applied excitation signals being matched to each other and the resultant moments of inertia associated with the capstans being matched to each other; means for guiding the length of film across the first and second capstans in non-slipping engagement therewith to transport the film past the work station from the first capstan to the second capstan responsive to the rotation of the capstans; and means for applying the same excitation signal to the first and second motors to apply the same torque to the first and second capstans.
Claim 3
Dependent Claim
188 words
A film transport system comprising: a length of film; a first capstan; a second capstan; a work station communicating with the film at a point between the first and second capstans; a first motor mechanically coupled to the first capstan to rotate the first capstan, the first motor developing a torque responsive to an applied excitation signal; a second motor mechanically coupled to the second capstan to rotate the second capstan in the same direction as the first capstan, the second motor developing a torque responsive to an applIed excitation signal; the torque responses of the motors to their respective applied excitation signals being matched to each other and the resultant moments of inertia associated with the capstans being matched to each other; means for guiding the length of film across the first and second capstans in non-slipping engagement therewith to transport the film past the work station from the first capstan to the second capstan responsive to the rotation of the capstans; and means for applying the same excitation signal to the first and second motors to apply the same torque to the first and second capstans.
Claim 4
Dependent Claim
188 words
A film transport system comprising: a length of film; a first capstan; a second capstan; a work station communicating with the film at a point between the first and second capstans; a first motor mechanically coupled to the first capstan to rotate the first capstan, the first motor developing a torque responsive to an applied excitation signal; a second motor mechanically coupled to the second capstan to rotate the second capstan in the same direction as the first capstan, the second motor developing a torque responsive to an applIed excitation signal; the torque responses of the motors to their respective applied excitation signals being matched to each other and the resultant moments of inertia associated with the capstans being matched to each other; means for guiding the length of film across the first and second capstans in non-slipping engagement therewith to transport the film past the work station from the first capstan to the second capstan responsive to the rotation of the capstans; and means for applying the same excitation signal to the first and second motors to apply the same torque to the first and second capstans.
Claim 5
Dependent Claim
38 words
The film transport system of claim 1, in which the applying means comprises means for connecting the first and second motors in series and a source of excitation current coupled to the first and second motors in series.
Claim 6
Dependent Claim
46 words
The film transport system of claim 2, additionally comprising means for sensing the transport speed of the film between the first and second capstans, the excitation current source producing a current representative of the deviation of the sensed film transport speed from a desired speed value.
Claim 7
Dependent Claim
57 words
The film transport system of claim 3, in which the film bears a coating of magnetic material suitable for recording sound signals, and the work station comprises a magnetic recording head in recording proximity to the magnetic coating and an electrical source of sound signals to be recorded on the film coupled to the magnetic recording head.
Claim 8
Dependent Claim
28 words
The film transport system of claim 4, additionally comprising a first flywheel mechanically coupled to the first motor and a second flywheel mechanically coupled to the second motor.
Claim 9
Dependent Claim
108 words
The film transport system of claim 5, additionally comprising a supply reel for storing the length of film, a first film buffer disposed in the film path between the supply reel and the first capstan, means for driving the supply reel to feed film to the first buffer as the first capstan removes film from the first buffer, a takeup reel for storing the length of film, a second film buffer disposed in the film path between the second capstan and the takeup reel, and means for driving the takeup reel to remove film from the second buffer as the second capstan feeds film to the second buffer.
Claim 10
Dependent Claim
38 words
The film transport system of claim 6, in which the means for sensing the transport speed of the film comprises a tachometer mechanically coupled to the second motor and the first flywheel is larger than the second flywheel.
Claim 11
Dependent Claim
108 words
The film transport system of claim 2, additionally comprising a supply reel for storing the length of film, a first film buffer disposed in the film path between the supply reel and the first capstan, means for driving the supply reel to feed film to the first buffer as the first capstan removes film from the first buffer, a takeup reel for storing the length of film, a second film buffer disposed in the film path between the second capstan and the takeup reel, and means for driving the takeup reel to remove film from the second buffer as the second capstan feeds film to the second buffer.
Claim 12
Dependent Claim
46 words
The film transport system of claim 1, additionally comprising means for sensing the transport speed of the film between the first and second capstans, the excitation current source producing a current representative of the deviation of the sensed film transport speed from a desired speed value.
Claim 13
Dependent Claim
57 words
The film transport system of claim 1, in which the film bears a coating of magnetic material suitable for recording sound signals, and the work station comprises a magnetic recording head in recording proximity to the magnetic coating and an electrical source of sound signals to be recorded on the film coupled to the magnetic recording head.
Claim 14
Dependent Claim
124 words
The film transport system of claim 1, additionally comprising a supply reel for storing the length of film, means for driving the supply reel to feed film to the first capstan, means in the film path between the supply reel and the first capstan for isolating The film fed to the first capstan from variations in film tension experienced by the film on the supply reel, a takeup reel for storing the length of film, means for driving the takeup reel to take film from the second capstan, and means in the film path between the second capstan and the takeup reel for isolating the film taken from the second capstan from variations in film tension experienced by the film on the takeup reel.
Claim 15
Independent Claim
138 words
A system for transporting a length of flexible ribbon without introducing appreciable variations in the tension of the ribbon, the system comprising: ribbon guiding means defining a ribbon path; first means responsive to applied torque for driving ribbon at a first point along the path; second means responsive to applied torque for driving ribbon in the same direction at a second point along the path displaced from the first point; first means for generating a torque responsive to an applied excitation signal; second means for generating a torque responsive to an applied excitation signal; means for coupling the first torque generating means to the first ribbon driving means; means for coupling the second torque generating means to the second ribbon driving means; and means for applying the same excitation signal to the first and second torque generating means.
Claim 16
Independent Claim
138 words
A system for transporting a length of flexible ribbon without introducing appreciable variations in the tension of the ribbon, the system comprising: ribbon guiding means defining a ribbon path; first means responsive to applied torque for driving ribbon at a first point along the path; second means responsive to applied torque for driving ribbon in the same direction at a second point along the path displaced from the first point; first means for generating a torque responsive to an applied excitation signal; second means for generating a torque responsive to an applied excitation signal; means for coupling the first torque generating means to the first ribbon driving means; means for coupling the second torque generating means to the second ribbon driving means; and means for applying the same excitation signal to the first and second torque generating means.
Claim 17
Dependent Claim
56 words
The system of claim 12, additionally comprising a supply reel for ribbon storage, a first ribbon buffer disposed in the path between the supply reel and the first ribbon driving means, a takeup reel for ribbon storage, and a second ribbon buffer disposed in the path between the second ribbon driving means and the takeup reel.
Claim 18
Dependent Claim
152 words
The system of claim 13, in which the first and second means for driving ribbon comprise first and second capstans, the first and second torque generating means comprise first and second motors each having excitation windings, the first and second coupling means comprise first and second shafts connected respectively between the first motor and the first capstan and the second motor and the second capstan, and the applying means comprises means for sensing the actual speed at which ribbon is driven between the first and second capstans, means for generating a control signal representative of the difference between the actual speed and a desired speed, means for connecting the excitation windings of the first and second motors in series, and means for applying the control signal to the excitation windings in series, the torque responses of the motors being matched and the resultant moments of inertia associated with the capstans being matched.
Claim 19
Dependent Claim
27 words
The system of claim 14, additionally comprising a recording station located in the ribbon path between the first and second capstans to record information on the ribbon.
Claim 20
Independent Claim
156 words
A method of transporting a length of film without introducing appreciable variations in film velocity or tension, the method comprising the steps of: guiding the film in a film path that extends between two spaced apart capstans in non-slipping engagement with the film, the resultant moment of inertia associated with each capstan being the same; coupling to one of the capstans a first motor that develops a torque responsive to an applied excitation signal; coupling to the other capstan a second motor that develops a torque responsive to an applied excitation signal, the torque responses of the first and second motors to their respective excitation signals being matched to each other; applying the same excitation signal to both of the first and second motors to apply the same torque to both capstans; and isolating the film in the film path between the capstans from variations in film tension along the remainder of the length of film.
Claim 21
Independent Claim
156 words
A method of transporting a length of film without introducing appreciable variations in film velocity or tension, the method comprising the steps of: guiding the film in a film path that extends between two spaced apart capstans in non-slipping engagement with the film, the resultant moment of inertia associated with each capstan being the same; coupling to one of the capstans a first motor that develops a torque responsive to an applied excitation signal; coupling to the other capstan a second motor that develops a torque responsive to an applied excitation signal, the torque responses of the first and second motors to their respective excitation signals being matched to each other; applying the same excitation signal to both of the first and second motors to apply the same torque to both capstans; and isolating the film in the film path between the capstans from variations in film tension along the remainder of the length of film.
References Cited (Backward Citations)
US3329876A
Cited
US3563492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |