GB194831A - Improvements in or relating to electric driving mechanism for sound recording or reproducing machines - Google Patents
Improvements in or relating to electric driving mechanism for sound recording or reproducing machinesInfo
- Publication number
- GB194831A GB194831A GB3494721A GB3494721A GB194831A GB 194831 A GB194831 A GB 194831A GB 3494721 A GB3494721 A GB 3494721A GB 3494721 A GB3494721 A GB 3494721A GB 194831 A GB194831 A GB 194831A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- motor
- governor
- circuit
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010586 diagram Methods 0.000 abstract 1
- 230000003467 diminishing effect Effects 0.000 abstract 1
- 238000009987 spinning Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current
- H02P7/063—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current using centrifugal devices, e.g. switch, resistor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/28—Speed controlling, regulating, or indicating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
194,831. Becker, P. A. Dec. 29, 1921. Starting and stopping. -In an electricallydriven sound-recording or reproducing machine, a switch in the motor-circuit is controlled by a centrifugal governor or the like, the switch being closed when the motor attains a predetermined speed (for example after being started by an auxiliary hand-switch) and opened when the speed of the motor drops below that limit (for example when the motor is short-circuited through an automatically-operated switch when the playing of a record is completed). Fig. 1 shows an arrangement of a governor-controlled switch, comprising a fixed contact n and a movable contact m mounted on a spring-actuated bell-crank lever h. One arm of this lever rests against the disc g of the governor, so that the speed of the motor a, acting through the governor. controls the switch in the manner described above. A circuit diagram is shown in Fig. 4. In this circuit, F is a push switch, normally open, and in parallel with the governor-switch m, n. To start the machine, the switch F is closed manually until the desired speed is attained. whereupon the circuit remains closed through the switch m, n. Alternatively, the machine may be started by spinning the turntable by hand. When the motor is short-circuited either by closing a hand-switch G or by the automatic closing of contacts w, w<1> by the sound-box on its reaching the end of the record, the diminishing speed of the motor causes the governor to break the circuit of the switch m, n. Fig. 2 shows an automaticallyoperated switch, corresponding to w, w<1>, in Fig. 4. This device comprises a bar s, pivotally mounted on a plug contact-member v and extending over the turntable into engagement with the central stub T. The bar, which has two contactrails mounted in grooves therein, carries an adjustable slider y, which makes connection between the rails and two contacts D, D<1> respectively. The circuit is closed when the arm D, which is pivoted at C, is moved by the soundbox against the member D<1>.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3494721A GB194831A (en) | 1921-12-29 | 1921-12-29 | Improvements in or relating to electric driving mechanism for sound recording or reproducing machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3494721A GB194831A (en) | 1921-12-29 | 1921-12-29 | Improvements in or relating to electric driving mechanism for sound recording or reproducing machines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB194831A true GB194831A (en) | 1923-03-22 |
Family
ID=10371934
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3494721A Expired GB194831A (en) | 1921-12-29 | 1921-12-29 | Improvements in or relating to electric driving mechanism for sound recording or reproducing machines |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB194831A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1012087B (en) * | 1954-07-08 | 1957-07-11 | Metz Transformatoren & App | Speed controller for turntable motors with DC excitation of the smallest design |
-
1921
- 1921-12-29 GB GB3494721A patent/GB194831A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1012087B (en) * | 1954-07-08 | 1957-07-11 | Metz Transformatoren & App | Speed controller for turntable motors with DC excitation of the smallest design |
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