GB2306758A - A rotary mode switch for a tape recording apparatus - Google Patents
A rotary mode switch for a tape recording apparatus Download PDFInfo
- Publication number
- GB2306758A GB2306758A GB9622647A GB9622647A GB2306758A GB 2306758 A GB2306758 A GB 2306758A GB 9622647 A GB9622647 A GB 9622647A GB 9622647 A GB9622647 A GB 9622647A GB 2306758 A GB2306758 A GB 2306758A
- Authority
- GB
- United Kingdom
- Prior art keywords
- operation mode
- cam gear
- brush
- switching device
- gear part
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/02—Control of operating function, e.g. switching from recording to reproducing
- G11B15/10—Manually-operated control; Solenoid-operated control
- G11B15/103—Manually-operated control; Solenoid-operated control electrically operated
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
- G11B15/26—Driving record carriers by members acting directly or indirectly thereon
Landscapes
- Mechanical Control Devices (AREA)
Abstract
A mode switching device 210 for a recording/reproducing apparatus eg. a video cassette recorder comprising a cam gear 220 rotationally mounted to the apparatus, a brush 224 mounted on the surface of the cam gear, a mode selection plate 240 having a plurality of mode patterns 244 formed on its lower surface and means for outputting a signal corresponding to a selected mode when the brush comes into contact with the corresponding mode pattern. The brush is held in place by a brush supporter 226.
Description
OPERATION MODE SWITCHING DEVICE FOR A REPRODUCING/RECORDING
APPARATUS
Background of the Invention
1. Field of the Invention
The present invention relates to a reproducing/recording apparatus, and particularly to an operation mode switching device for a reproducing/recording apparatus.
2. Prior Art
Generally, a reproducing/recording apparatus such as a cassette tape recorder or an optical disc player is provided with a loading cam motor, an operation mode switching device, a control unit (for example, a microcomputer), and a capstan motor.
An operation mode refers to a playback of a tape or recording medium, a fast rewinding of the same, and so on. When a user selects an operation mode button mounted on a cassette tape recorder, a first signal according to the selected operation mode button is inputted into the control unit. The operation mode switching device sequentially switches one operation mode to another in accordance with the loading cam motor. A second signal according to an operation mode selected by the operation mode switching device is inputted into the control unit. When a user selects an operation mode by pressing an operation mode button, the control unit compares the first signal with the second signal.As a result of the comparison, if the first signal is identical to the second signal, the control unit maintains a present operation of the capstan motor since the operation mode of the operation mode switching device is the operation mode selected by the user. If the above two signals are different from each other, the control unit operates the loading cam motor to be rotated forwards or backwards. According to the forward or the backward rotation of the loading cam motor, the operation mode switching apparatus selects a third operation mode. The operation mode switching apparatus outputs the third signal according to the third operation mode. That is, the control unit controls the loading cam motor until the operation mode switching device selects an operation mode chosen by a user.If the operation mode switching device selects an operation mode chosen by a user, the control unit controls the capstan motor in order for a cassette tape recorder to be operated in the operation mode chosen by the user.
FIG. 1 is a view for showing in a disassembled state a conventional operation mode switching device of a reproducing/recording apparatus. As shown in FIG. 1, the conventional operation mode switching device 200 comprises a cam gear part 80, an operation mode selection plate 90, and an operation mode pattern plate 50. A cam gear 84 of the cam gear part 80 is meshed with a worm wheel of the loading cam motor (not shown). The cam gear part 80 is rotated according to a rotation of the loading cam motor. The cam gear part 80 has a center shaft 82 and two pins 81. The operation mode selection plate 82 is rotated according to the cam gear part 80. The operation mode selection plate 90 is formed in a disc shape.The operation mode selection plate 90 has a first opening 96, two pin receiving protrusions 91, brush 94 and a plurality of first hooks 92. The first opening 96 is formed in the center of the operation mode selection plate 90. The two pin receiving protrusions 91 are formed on the lower surface of the operation mode selection plate 90. The two pin receiving protrusions 91 respectively have a pin receiving groove. The brush 94 is fixed on the upper surface of the operation mode selection plate 90. The brush 94 is formed in a fork shape and has a plurality of forked portions. In FIG. 1, three forked portions are shown. The plurality of first hooks 92 protrude from the surface of the operation mode selection plate 90. The plurality of first hooks 92 are formed along the periphery of the first opening 96 and in a certain distance therebetween.The center shaft 82 of the cam gear part 80 is inserted in the first opening 96. The two pins 81 of the cam gear part 80 are received correspondingly in the two pin receiving protrusions 91. Accordingly, when the cam gear part 80 is rotated, the operation mode selection plate 90 is rotated. The operation mode selection plate 90 is engaged with the operation mode pattern plate 50. The operation mode pattern plate 50 is formed in a disc shape. The operation mode pattern plate 50 has a second opening 54, a plurality of operation mode patterns 51, and a plurality of second hooks 52. The second opening 54 is formed in the center of the operation mode pattern plate 50.The plurality of operation mode patterns 51 is electrical conductors, and formed on the lower surface of the operation mode pattern plate 50 along each of a plurality of operation mode pattern paths. Each of the plurality of operation mode pattern 51 is formed in parallel with the periphery of the operation mode pattern plate 50. That is, the plurality of operation mode patterns 51 are formed in a concentric manner with respect to the second opening 54. In FIG. 1, three operation mode patterns are shown. Accordingly, three concentric circles of operation mode patterns are formed on the operation mode pattern plate 50. As shown in FIG. 1, the plurality of operation mode patterns 51 on the concentric circles are formed differently. The plurality of the second hooks 52 are formed in a certain distance along the periphery of the operation mode pattern plate 50.In FIG. 1, there are three second hooks shown.
Reference numeral 60 denotes a bracket. In general, the bracket 60 is made of resin compound. The bracket 60 is, for example, fixed on a deck mechanism of a cassette tape recorder.
The bracket 60 has a plurality of hook openings 61. The plurality of second hooks 52 are inserted into the plurality of hook openings 61. Accordingly, the operation mode pattern plate 50 is fixed on the bracket 60.
In the conventional operation mode switching device 200 mentioned above, the two pins 81 are inserted into the two pin receiving protrusions 91 so that the cam gear part 80 is engaged with the operation mode selection plate 90. There is a difference between the outer diameter of one pin and the diameter of one pin receiving groove. With a difference of the diameters, a rotation angle of the cam gear part 80 can be different from that of the operation mode selection plate 90. Further, when the difference of the rotation angles is accumulated, a difference of a rotation angle therebetween becomes larger. Accordingly, selection of an operation mode can be unstable.
Summarv of the Invention
It is an object of the present invention to provide an operation mode switching device which accurately selects an operation mode of a reproducing/recording apparatus.
In order to achieve the object, the operation mode switching device according to the present invention comprises a cam gear part and an operation mode selection plate. The cam gear part is rotated according to a driving part so as to select an operation mode, fixed rotatably on a main chassis, has a center shaft on the center of the upper surface, and has a brush formed in a fork shape having a plurality of forked portions on one side of the upper surface and a body connecting the plurality of forked portions. The operation mode selection plate has an opening in order for the center shaft to be inserted thereto, an operation mode signal output part on one side thereof for outputting a signal corresponding to a selected operation mode, a plurality of operation mode pattern paths each having a plurality of operation mode patterns on the lower surface thereof, and a plurality of hooks connected with a bracket. The plurality of operation mode pattern paths are concentric with respect to opening, electrically isolated to each other. The plurality of forked portions of the brush select operation modes while moving along the plurality of operation mode pattern paths. The cam gear part is formed in a disc shape, and a cam gear is formed along the periphery. The cam gear part has a brush supporter for supporting and fixing the brush.The center shaft of the cam gear part has a rotating shaft and a supporting boss having a post receiving groove at the center thereof. The rotation shaft is inserted into the opening, and a post formed on a main chassis is inserted into a post receiving groove.
Accordingly, if a user presses an operation mode button mounted on a reproducing/recording apparatus such as a cassette tape recorder, a first signal according to a selected operation mode is inputted into a control unit. The cam gear part of the operation mode switching device is rotated in accordance with a rotation of the loading cam motor. The cam gear part is rotated so that the plurality of forked portions of the brush moves along the plurality of operation mode pattern paths. The brush is rotated so that operation patterns each formed along the plurality of operation mode pattern paths are selected. Operation mode patterns selected are electrically connected to constitute one operation mode. When one operation mode is constituted, a second signal for the operation mode is outputted to a control unit from the operation mode signal output part.The control unit compares the first signal with the second signal. As a result of the comparison, when the first signal is identical to the second signal, the control unit maintains a present operation of the capstan motor since an operation mode of the operation mode switching device is the operation mode which a user selects. If the first signal is not identical to the second signal, the control unit operates the loading cam motor to be rotated in a forward or a backward direction. According to the forward or the backward rotation of the loading cam motor, the operation mode switching device selects a third operation mode. The operation mode switching apparatus outputs the third signal according to the third operation mode to the control unit.That is, the control unit controls the loading cam motor until the operation mode switching device selects an operation mode chosen by a user.
If the operation mode switching device selects an operation mode chosen by a user, the control unit controls the capstan motor in order for a cassette tape recorder to be operated in the operation mode chosen by the user.
By the operation mode switching device according to the present invention, an accurate selection of an operation mode can be accomplished since the cam gear part is rotated together with the brush when the operation mode is selected.
Brief DescriPtion of the Drawings
The above objects and other advantages of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings, in which:
FIG. 1 is a view for showing in a disassembled state a conventional operation mode switching device of a reproducing/recording apparatus;
FIG. 2 is a view for showing in a disassembled state an operation mode switching device of a reproducing/recording apparatus according to a first embodiment of the present invention;
FIG. 3 is a view for showing a cross section of the operation mode switching device of FIG. 2; and
FIG. 4 is a view for showing an operation mode switching device of a reproducing/recording apparatus according to a second embodiment of the present invention.
Detailed Description of the Preferred Embodiments
Description will be made in detail hereinafter on operation mode switching devices according to embodiments of the present invention in reference with accompanying drawings.
FIG. 2 is a view for showing in a disassembled state an operation mode switching device of a reproducing/recording apparatus according to a first embodiment of the present invention, and FIG. 3 is a view for showing a cross section of the operation mode switching device of FIG. 2. As shown in FIGs.
2 and 3, the operation mode switching device 210 according to the first embodiment of the present invention comprises a cam gear part 220 and an operation mode pattern plate 240. The cam gear part 220 is meshed with a worm wheel of a loading cam motor(not shown). The cam gear part 220 is rotated according to a rotation of the loading cam motor. The cam gear part 220 has a center shaft 222, a brush 224, a brush supporter 226, and a cam gear 228. The center shaft 222 includes a rotation shaft 230 and a supporting boss 232. The center shaft 222 is a protrusion formed on the center of the cam gear part 220. The rotation shaft 230 is formed on the upper portion of the center shaft 222, and the supporting boss 232 is formed between the upper surface of the cam gear part 220 and the lower end of the rotation shaft 230.
The supporting boss 232 has a post receiving groove (not shown) in its center portion. The post receiving groove is formed from the lower surface of the cam gear part 220. Further, a brush supporter 226 is formed on the upper surface of the cam gear part 220.
The brush 224 is fixed on the upper surface of the brush supporter 226. The brush 224 is formed in a fork shape, and has a plurality of forked portions and a body connecting the plurality of forked portions together. In FIG. 2, there are three forked portions 224a, 224b and 224c shown. The cam gear 228 is formed along the outer periphery of the cam gear part 220. The cam gear 228 is meshed with a wormwheel of the loading cam motor.
The operation mode pattern plate 240 is formed in a disc shape. The operation mode pattern plate 240 has a third opening 242, a plurality of operation mode pattern paths, a plurality of third hooks 246, and an operation mode signal output part 248.
The third opening 242 is formed in the center of the operation mode pattern plate 240. Various operation mode patterns are formed along one operation mode pattern path. The various operation mode patterns are made of electric conductors and formed on the lower surface of the operation mode pattern plate 240. Each of the plurality of operation mode pattern paths are formed in parallel with the periphery of the operation mode pattern plate 240. That is, the plurality of operation mode pattern paths are formed concentric with respect to the third opening, respectively. The plurality of operation mode pattern paths are electrically isolated from each other. In FIG. 2, there are three operation mode pattern paths shown. That is, three concentric circles are formed on the operation mode pattern plate 240.As shown in FIG. 2, the plurality of operation mode patterns 244 are formed differently along each of the concentric circles.
The plurality of forked portions of the brush 224 correspond to the plurality of operation mode pattern paths respectively.
Therefore, the plurality of operation mode pattern paths can be electrically connected by the plurality of forked portions of the brush 224. The plurality of third hooks 246 are formed in a certain distance along the periphery of the operation mode pattern plate 240. In FIG. 3, there are three third hooks shown.
Reference numeral 248 denotes an operation mode signal output part. The operation mode signal output part 248 has a plurality of operation mode signal output terminals 250. Each of the operation mode signal output terminals 250 outputs an operation mode signal according to an operation mode pattern selected by the brush 224.
The outputted operation mode signal is inputted into the control unit. The control unit compares an operation mode inputted by a user with an operation mode selected by the brush 224. The control unit repeats the processes described above in the Prior Art so that it operates a reproducing/recording apparatus in an operation mode selected by a user.
The operation mode pattern plate 240 is engaged with the bracket 260. In general, the bracket 260 is made of resin compound. The bracket 260 has a plurality of hook engagement holes 262. The plurality of third hooks 246 are correspondingly inserted into the plurality of hook engagement holes 262.
Therefore, the operation mode pattern plate 240 is fixed to the bracket 260.
Reference numeral 280 denotes a main chassis. The main chassis 280 is called a deck. A post 282 is mounted on the main chassis 280. The post 282 protrudes toward the cam gear part 220.
The post 282 is inserted into the post receiving groove of the supporting boss 232. By the insertion of the post 282 into the post receiving groove and the insertion of the rotation shaft 230 into the third opening 242, the cam gear part 220 is fixed to be placed in a certain position with respect to the operation mode pattern plate 240.
FIG. 4 is a view for showing an operation mode switching device of a reproducing/recording apparatus according to a second embodiment of the present invention. The same parts or portions in the second embodiment as those in the first embodiment have the same reference numerals. As shown in FIG. 4, an operation mode switching device for a reproducing/recording apparatus according to the second embodiment of the present invention comprises a bracket 410 and a cam gear part 220. The bracket 410 has a plurality of operation mode patterns 412 and a rotation shaft receiving groove 414. The plurality of operation mode patterns 412 having different radii to each other are concentric with respect to the rotation shaft receiving groove 414.The plurality of operation mode patterns 412 are made of electrical conductors along the plurality of operation mode pattern paths as shown in the first embodiment. A plurality of output terminals 416 protrude from one side of the bracket 410. The rotation shaft 230 of the cam gear part 220 is inserted into the rotation shaft receiving groove 414 of the bracket 410. As in the first embodiment, a post receiving groove (not shown, but can be understandable in technical and structural manners) is formed. A post 420 is mounted on the main chassis 280. The post 420 is a protrusion toward the cam gear part 220. The post 420 is inserted into the post receiving groove of the supporting boss 232.By the insertion of the post 420 into the cam gear part 220 and the insertion of the rotation shaft 230 into the rotation shaft receiving groove 414, the cam gear part 220 is rotatably fixed to be placed in a certain position with respect to the bracket 410.
Relations between the brush 224 and the operation mode pattern 412 are the same as described above.
Operations of the operation mode switching device for a reproducing and recording apparatus according to the embodiments of the present invention mentioned above will be described hereinafter.
When a user selects an operation mode button mounted on a cassette tape recorder, a first signal according to the selected operation mode button is inputted into the control unit. The cam gear part 220 of the operation mode switching apparatus is rotated according to a rotation of the loading cam motor. The plurality of forked portions of the brush 224 move along the operation mode pattern paths in accordance with the cam gear part 220. Operation mode patterns each formed along the plurality of operation mode pattern paths are selected by the rotation of the brush 224. The selected operation mode patterns are electrically connected by the brush 224 to constitute an operation mode. If one operation mode is constituted, a second signal for the operation mode is outputted to the operation mode signal output part 248 from the control unit.When a user selects an operation mode by pressing an operation mode button, the control unit compares the first signal with the second signal. As a result of the comparison, if the first signal is identical to the second signal, the control unit maintains a present operation of the capstan motor since the operation mode of the operation mode switching device is the operation mode selected by the user. If the above two signals are different from each other, the control unit operates the loading cam motor to be rotated forwards or backwards. According to the forward or the backward rotation of the loading cam motor, the operation mode switching apparatus selects a third operation mode. The operation mode switching apparatus outputs the third signal according to the third operation mode. That is, the control unit controls the loading cam motor until the operation mode switching device selects an operation mode chosen by a user. If the operation mode switching device selects an operation mode chosen by a user, the control unit controls the capstan motor in order for a cassette tape recorder to be operated in the operation mode chosen by the user.
As described above, an accurate selection of an operation mode can be accomplished since the cam gear part is rotated together with the brush when the operation mode is selected.
While the present invention has been particularly shown and described with reference to particular embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be effected therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. An operation mode switching device for a reproducing/recording apparatus for selecting an operation mode such as a playback or a fast rewind, the operation mode switching device being rotated by a driving means controlled by a control unit and mounted between a bracket and a main chassis, comprising:
A cam gear part for selecting an operation mode by being rotated according to a driving part, wherein the cam gear part is rotatably fixed on the main chassis, has a center shaft on the center of the upper surface, and has a brush formed in a fork shape having a plurality of forked portions on one side of the upper surface and a body connecting the plurality of forked portions; and
An operation mode selection plate having an opening in order for the center shaft to be inserted thereto, having an operation mode signal output part on one side thereof for outputting a signal corresponding to a selected operation mode, having a plurality of operation mode pattern paths each having a plurality of operation mode patterns on the lower surface thereof, and having a plurality of hooks connected with a bracket, wherein the plurality of operation mode pattern paths are concentric with respect to the opening, isolated electrically to each other, and the plurality of forked portions of the brush select operation modes while moving along the plurality of operation mode pattern paths.
2. The operation mode switching device as claimed in claim 1, wherein the cam gear part has a brush supporter for supporting and fixing the brush.
3. The operation mode switching device as claimed in claim 1, wherein the center shaft of the cam gear part has a rotating shaft and a supporting boss having a post receiving groove at the center thereof, the rotation shaft is inserted into the opening, and a post formed on a main chassis is inserted into a post receiving groove.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019950031298U KR970019426U (en) | 1995-10-31 | 1995-10-31 | Mode switch position control structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9622647D0 GB9622647D0 (en) | 1997-01-08 |
| GB2306758A true GB2306758A (en) | 1997-05-07 |
Family
ID=19427561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9622647A Withdrawn GB2306758A (en) | 1995-10-31 | 1996-10-31 | A rotary mode switch for a tape recording apparatus |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09167394A (en) |
| KR (1) | KR970019426U (en) |
| GB (1) | GB2306758A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3395581B2 (en) | 1997-06-24 | 2003-04-14 | 日産自動車株式会社 | Transmission control device for continuously variable transmission |
| KR100485825B1 (en) * | 2002-11-05 | 2005-04-28 | 삼성전자주식회사 | Mode-switch apparatus for magnetic recording/reading apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652947A (en) * | 1982-05-19 | 1987-03-24 | Matsushita Electric Industrial Co., Ltd. | Rotary encoder |
| US5061848A (en) * | 1988-06-29 | 1991-10-29 | Goldstar Co., Ltd. | Non-contacting rotary type mode switch for magnetic tape recording device |
| DE4319854A1 (en) * | 1992-06-17 | 1993-12-23 | Gold Star Co | Switching unit for magnetic tape recorder providing double function - of sensor and tape cassette ejector in which index wheel has signal tracks and cam track for ejector operation. |
-
1995
- 1995-10-31 KR KR2019950031298U patent/KR970019426U/en not_active Application Discontinuation
-
1996
- 1996-10-30 JP JP8288150A patent/JPH09167394A/en not_active Withdrawn
- 1996-10-31 GB GB9622647A patent/GB2306758A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4652947A (en) * | 1982-05-19 | 1987-03-24 | Matsushita Electric Industrial Co., Ltd. | Rotary encoder |
| US5061848A (en) * | 1988-06-29 | 1991-10-29 | Goldstar Co., Ltd. | Non-contacting rotary type mode switch for magnetic tape recording device |
| DE4319854A1 (en) * | 1992-06-17 | 1993-12-23 | Gold Star Co | Switching unit for magnetic tape recorder providing double function - of sensor and tape cassette ejector in which index wheel has signal tracks and cam track for ejector operation. |
Non-Patent Citations (1)
| Title |
|---|
| WPI Abstract Accession No:94-000853/01 & DE4319854 A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9622647D0 (en) | 1997-01-08 |
| JPH09167394A (en) | 1997-06-24 |
| KR970019426U (en) | 1997-05-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |