GB1120101A - Improvements in and relating to film projectors - Google Patents
Improvements in and relating to film projectorsInfo
- Publication number
- GB1120101A GB1120101A GB3021365A GB3021365A GB1120101A GB 1120101 A GB1120101 A GB 1120101A GB 3021365 A GB3021365 A GB 3021365A GB 3021365 A GB3021365 A GB 3021365A GB 1120101 A GB1120101 A GB 1120101A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- relay
- switch
- lower voltage
- rectifier
- 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
- 238000004804 winding Methods 0.000 abstract 3
- 244000027321 Lychnis chalcedonica Species 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000007723 transport mechanism Effects 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
- H02P3/24—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by applying DC to the motor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B19/00—Cameras
- G03B19/18—Motion-picture cameras
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
- Projection Apparatus (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
1,120,101. Control of A.C. motors. EUGEN BAUER G.m.b.H. 16 July, 1965 [18 July, 1964], No. 30213/65. Heading H2J. [Also in Division G2] The A.C. motor 12 driving the film transport mechanism of a cine projector is rapidly halted electromagnetically by the discharge of a D.C. pulse from capacitor 33 into the stator windings of the motor by means of switch 24, actuated by a main relay 39, which, in its normal position, closes the A.C. supply circuit to the motor. The relay simultaneously actuates switch 28 to send a direct current at a lower voltage than the braking pulse into the stator windings to hold the motor in its arrested position. Correct phasing of the discharge with motor supply is obtained by means of rectifiers 43, 44 in the lead 38 from winding 36 of transformer 19 to relay 39. The relay actuating current is supplied from rectifier 43 at a higher voltage in one half-cycle, and a lower voltage relay holding current is supplied from rectifier 44 in the other half-cycle. The motor holding current circuit also opens switch 35<SP>1</SP>, whereby the main relay 39 may only be energized through switch 15 which is operated in synchronism with the film drive by a cam 14, 46 on the motor shaft. Switch 15 opens during the film feed stroke of a Maltese-cross system so that motor 12 restarts at a lower voltage and moves until cam 46 releases the switch 15, when relay 39 operates again. Switch 40 which controls relay 39, may be actuated by a remote control device.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB77740A DE1230310B (en) | 1964-07-18 | 1964-07-18 | Moving image projector with quick stop device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1120101A true GB1120101A (en) | 1968-07-17 |
Family
ID=6979591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3021365A Expired GB1120101A (en) | 1964-07-18 | 1965-07-16 | Improvements in and relating to film projectors |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1230310B (en) |
| GB (1) | GB1120101A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3810692A (en) * | 1970-07-06 | 1974-05-14 | Vockenhuber Karl | Photographic film-handling appliance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE710435C (en) * | 1935-05-03 | 1941-09-13 | Siemens Schuckertwerke Akt Ges | Electrodynamic braking process for asynchronous motors |
| DE707477C (en) * | 1938-04-27 | 1941-06-23 | Siemens Schuckertwerke Akt Ges | Arrangement for reversing the direction of rotation of three-phase asynchronous motors |
| DE1145918B (en) * | 1960-09-20 | 1963-03-21 | Fernseh Gmbh | Device for remote-controlled switching on and off of film camera motors |
| DE1132426B (en) * | 1961-08-19 | 1962-06-28 | Leitz Ernst Gmbh | Circuit arrangement for camera motor |
-
1964
- 1964-07-18 DE DEB77740A patent/DE1230310B/en active Pending
-
1965
- 1965-07-16 GB GB3021365A patent/GB1120101A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3810692A (en) * | 1970-07-06 | 1974-05-14 | Vockenhuber Karl | Photographic film-handling appliance |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1230310B (en) | 1966-12-08 |
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