GB298725A - Improved electrical driving mechanism for gramophones and the like - Google Patents
Improved electrical driving mechanism for gramophones and the likeInfo
- Publication number
- GB298725A GB298725A GB2109327A GB2109327A GB298725A GB 298725 A GB298725 A GB 298725A GB 2109327 A GB2109327 A GB 2109327A GB 2109327 A GB2109327 A GB 2109327A GB 298725 A GB298725 A GB 298725A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- fork
- motor
- drum
- blade
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
298,725. Rebikoff, W. Aug. 10, 1927. Driving.-A gramophone or the like is driven by an electromotor acting through a spring, the spring being energized periodically by the motor under the control of a switch, which closes whenever the spring has run down to a predetermined small extent and opens when the lost energy has been restored. The switch is adapted to speed up the motor when necessary, by shortcircuiting a resistance in the motor circuit. In the construction shown in Figs. 1 and 2, an electromotor 1 is geared through a worm and wheel 2 to a sleeve 2a to which the inner end of a spring 3a is secured, the outer end of the spring being attached to a drum 3 mounted on a spindle 5 passing through the sleeve. A wheel 6 on the drum drives the turntable spindle 8, which is controlled by a governor. On the sleeve 2a is fixed a plate 4 carrying a contact-blade 14, and having pivoted thereon a forked contactmember 11, from the ends of which project insulated pegs between which the periphery of the drum passes. These pegs are adapted to be engaged respectively by cams 16, 17 on the drum, by means of which the fork 11 is moved so that contact is either made or broken between the outer branch of the fork and the blade 14. Two slip rings 10 are mounted on the sleeve 2a and are engaged by brushes 9 in the circuit of the motor, a resistance 9<a> being connected across the brushes. One slip ring 10 is connected to a spring 13, which engages one or other of a pair of notches in the fork 11, the other slip ring being connected to the blade 14. When the cam 17 moves the fork 11 into contact with the blade 14, the resistance 9<a> is short-circuited, and the motor 1 runs at such a speed that the arm 4 carried by the sleeve 2a rotates more rapidly than the drum 3 driven by the spring. The latter is therefore wound up until the fork 11 overtakes the cam 16 and is moved thereby so that contact with the blade 14 is broken. This brings the resistance 9a into the motor circuit, and the motor is slowed up, the spring unwinding for a period until the cam 17 again engages the fork 11 and the action described above is repeated. The distance by which the cams 16, 17 are spaced apart on the drum is preferably adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2109327A GB298725A (en) | 1927-08-10 | 1927-08-10 | Improved electrical driving mechanism for gramophones and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2109327A GB298725A (en) | 1927-08-10 | 1927-08-10 | Improved electrical driving mechanism for gramophones and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB298725A true GB298725A (en) | 1928-10-18 |
Family
ID=10157093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2109327A Expired GB298725A (en) | 1927-08-10 | 1927-08-10 | Improved electrical driving mechanism for gramophones and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB298725A (en) |
-
1927
- 1927-08-10 GB GB2109327A patent/GB298725A/en not_active Expired
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