US4586103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic control device for tape recorder
Assignee: U-ENGINEERING Co Ltd KOKUBUNJI-SHI TOKYO JAPAN
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Filing: 1982-12-13
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Granted: 1986-04-29
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Expires: 2002-12-13
Abstract
Abstract A movable element is attracted and displaced by an electromagnet against the resilience of a return spring to change a tape recorder from stoppage state into operation state. When the element is returned to its original position by the magnet, it moves so as to change the tape recorder from stoppage state into operation state. The return spring is so selected as to exert a force stonger than the attractive force, which acts on the movable element by the residual magnetism of the electromagnet, whereby the return of the element is achieved with certainty. In a case where a tape recorder is supplied with electric power from commercial power, when the supply of such power is cut off due to an accident, such as power failure, while the tape recorder is in use, a combination of a cam and a spring enables automatic restoration of the tape recorder to stoppage state.
Inventors
- 👤 Zenshiro Uehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:27
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/10; G11B15/103; G11B15/18; G11B15/1883; G11B15/44; G11B15/442
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
248 words
An electromagnetic control device a for tape recorder, and comprising: a chassis, a capstan rotatably mounted on the chassis, a flywheel mounted on the capstan in coaxial relation with said capstan, a first toothed wheel mounted on the capstan in coaxial relation therewith, a second toothed wheel which has a pair of hiatuses and is rotatably mounted on the chassis for meshing engagement with the first wheel, a plate cam mounted integrally with the second wheel, a tiltable element which is mounted on the chassis such that it tilts with the rotation of the plate cam and which derives a force necessary for changeover operation of the tape recorder from angular displacement of said tiltable element, a movable element which is mounted such that it is tiltable for locking engagement with and disengagement from the second wheel, the movable element locking the second wheel against rotation when any one hiatus of the second wheel is opposed to the first wheel, an electromagnet exerting a magnetic attraction on the movable element for tilting same, and a return spring having one end fixed on a side opposite to the side on which said force derived by the tiltable element is available, wherein the second wheel is provided with teeth only one peripheral portion between the hiatuses, and wherein the return spring is fixed to the movable element at a point which is generally symmetrical with respect to a core of said electromagnet about a pivot axis of the movable element.
Claim 2
Dependent Claim
248 words
An electromagnetic control device a for tape recorder, and comprising: a chassis, a capstan rotatably mounted on the chassis, a flywheel mounted on the capstan in coaxial relation with said capstan, a first toothed wheel mounted on the capstan in coaxial relation therewith, a second toothed wheel which has a pair of hiatuses and is rotatably mounted on the chassis for meshing engagement with the first wheel, a plate cam mounted integrally with the second wheel, a tiltable element which is mounted on the chassis such that it tilts with the rotation of the plate cam and which derives a force necessary for changeover operation of the tape recorder from angular displacement of said tiltable element, a movable element which is mounted such that it is tiltable for locking engagement with and disengagement from the second wheel, the movable element locking the second wheel against rotation when any one hiatus of the second wheel is opposed to the first wheel, an electromagnet exerting a magnetic attraction on the movable element for tilting same, and a return spring having one end fixed on a side opposite to the side on which said force derived by the tiltable element is available, wherein the second wheel is provided with teeth only one peripheral portion between the hiatuses, and wherein the return spring is fixed to the movable element at a point which is generally symmetrical with respect to a core of said electromagnet about a pivot axis of the movable element.
Claim 3
Dependent Claim
158 words
An electromagnetic control device wherein a cam drive mechanism is unlocked in response to attraction of a moveable element by an electromagnet for angularly moving a tiltable element to effect a desired operation, characterized by: a release spring connected between the movable element and the tiltable element which are disposed in confronting relation; means for supporting said release element in a substantially floating condition before said moveable element is attracted to said electromagnet for saving power of the electromagnet upon attraction; means for displacing said tiltable element in response to angular movement of a cam of said cam drive mechanism to effect the desired operation and for simultaneously tensioning said release spring sufficiently after said movable element has been attracted to said electromagnet; and means for returning said moveable element to an original position under the tension of said release spring when said electromagnet is deenergized while overcoming an attractive force due to residual magnetism of said electromagnet.
Claim 4
Dependent Claim
158 words
An electromagnetic control device wherein a cam drive mechanism is unlocked in response to attraction of a moveable element by an electromagnet for angularly moving a tiltable element to effect a desired operation, characterized by: a release spring connected between the movable element and the tiltable element which are disposed in confronting relation; means for supporting said release element in a substantially floating condition before said moveable element is attracted to said electromagnet for saving power of the electromagnet upon attraction; means for displacing said tiltable element in response to angular movement of a cam of said cam drive mechanism to effect the desired operation and for simultaneously tensioning said release spring sufficiently after said movable element has been attracted to said electromagnet; and means for returning said moveable element to an original position under the tension of said release spring when said electromagnet is deenergized while overcoming an attractive force due to residual magnetism of said electromagnet.
Claim 5
Dependent Claim
126 words
In a machine control having an electromagnet for attracting a moveable element toward a core by a magnetic force upon energization thereof in order to effect an operating state of said machine, and a spring means for overcoming a magnetic residual force and moving said element away from said core upon deenergization of said electromagnet means to ensure a non-operating state of said machine, the improvement comprising: means for minimizing said magnetic force needed to attract said moveable element by providing said spring means with a first spring force less than said residual force during said attracting and, after said element is attracted to said core, providing said spring means with a second spring force sufficient to overcome said residual force upon deenergizing of said electromagnet.
Claim 6
Dependent Claim
126 words
In a machine control having an electromagnet for attracting a moveable element toward a core by a magnetic force upon energization thereof in order to effect an operating state of said machine, and a spring means for overcoming a magnetic residual force and moving said element away from said core upon deenergization of said electromagnet means to ensure a non-operating state of said machine, the improvement comprising: means for minimizing said magnetic force needed to attract said moveable element by providing said spring means with a first spring force less than said residual force during said attracting and, after said element is attracted to said core, providing said spring means with a second spring force sufficient to overcome said residual force upon deenergizing of said electromagnet.
Claim 7
Dependent Claim
48 words
An improvement as in claim 3, wherein said minimizing means further coimprises: cam means for controlling extension and retraction of at least one spring of said spring means according to said machine being respectively in said operating and nonoperating states to provide said second and first spring forces.
Claim 8
Dependent Claim
47 words
An improvement as in claim 3, and further comprising: another said electromagnet and another said minimizing means; and means for preventing effecting of an operating state by said electromagnet and said minimizing means simultaneously with an operating state by said other electromagnet and said other minimizing means.
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) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |