GB2272988A - Drum of a tape recorder and an assembling method therefor - Google Patents
Drum of a tape recorder and an assembling method therefor Download PDFInfo
- Publication number
- GB2272988A GB2272988A GB9322391A GB9322391A GB2272988A GB 2272988 A GB2272988 A GB 2272988A GB 9322391 A GB9322391 A GB 9322391A GB 9322391 A GB9322391 A GB 9322391A GB 2272988 A GB2272988 A GB 2272988A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drum
- boss
- trans
- tape recorder
- rotor
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
- G11B5/53—Disposition or mounting of heads on rotating support
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The drum of a tape recorder is mode from an upper drum part (253) and a lower stationary drum part (165) attached to a shaft (150), each part carrying a part of a rotary transformer (155), (164) through which signals are directly coupled to a magnetic head (152). By making the upper drum part (253) as a single component on which the transformer part (155) and head (152) are directly mounted, accurate assembly of the drum is facilitated. Bosses (255), (161) on the upper and lower parts project one within the other. A spacer ring (166), and a sprung washer (168) and bush (169), ensure that a derived gap between transformer parts (155), (164) is established and that the inner races of upper and lower bearings (162), (163) are maintained under pressure. <IMAGE>
Description
DRUM OF A TAPE RECORDER AND
AN ASSEMBLING METXIOD THEREFOR
The present invention relates to a drum of a tape recorder and a method for assembling the drum, and more particularly to a drum of a tape recorder and an assembling method therefor, wherein a trans-rotor is installed to be directly fixed on the lower portion of a boss in an upper drum which is then directly installed on a drum shaft, so that several components are eliminated so as to economise cost and the assembling of the drum is simply and easily carried out to improve operational efficiency and productivity.
Generally, as shown in figure 1, a travelling system for transferring a tape in a tape recorder includes a supply reel disc 11 and a take-up reel disc 12 of a cassette 13, which are installed on both sides of a deck 10 for transferring a tape 14, and a drum 15 is provided for recording a signal or playing the recorded signal on the tape 14 of the cassette 13 seated on the deck 10.
On the left of the drum 15, a tension arm 16 having a tension pole 17 on a free end thereof is formed to control tension of the tape 14, and an impedance roller 18 is disposed for stably guiding the travel of the tape 14.
On both sides of the deck 10 adjacent to the drum 15, the tape 14 is guided via
.,, guide rollers 21 and oblique poles 22 of pole bases which are loaded along loading grooves 19 on the upper portion of the deck 10.
On the right of the deck, a middle pole 23 for altering a travelling direction of the tape 14 is fixed on the deck 10, and a capstan shaft 24 and a pinch roller 25 are installed for transferring the tape 14 in a constant speed.
Due to a mechanical characteristic of the deck 10, a review arm 27 fixed with a review pole 26 is provided for securing a smooth state of the tape 14 which is being transferred along the travel-path on the deck 10.
According to the tape recorder as constructed above, during a play mode, the tape 14 from the supply reel disc 11 is transferred while being loaded on the drum 15 via the tension pole 17 of the tension arm 16, impedance roller 18, guide roller 21 and oblique pole 22 of the pole base. In addition to this, the tape 14 transferred to the drum 15 passes the guide roller 21 and oblique pole 22 of the pole base winds around the take-up reel disc 12 via the middle pole 23, capstan shaft 24 and review pole 26 of the review arm 27 which contact with each other by the pressure of the pinch roller 25.
Here, the drum 15 records a signal or plays the recorded signal on the tape 14 which travels along the aforesaid predetermined path.
In the conventional drum 15 used for the tape recorder, as illustrated in figures 2 and 3, a rotary disc 151 is pressed to-be fixed on the upper portion of a drum shaft 150 which is rotated by a drum motor (not shown), and an upper drum 153 having a magnetic head 152 fixed on the lower surface thereof is coupled to the rotary disc 151 by means of a plurality of screws 154. A trans-rotor 155 is mounted on the lower side of the rotary disc 151, and the end of a wire 156 of the trans-rotor 155 is connected to a terminal pin 158 of a wire-guiding member 157 to be connected to, in the aspect of circuitry, a circuit board 160 which is provided on the upper side of the upper drum 153 through a relay 159 connected to the magnetic head 152.
On the lower side of the upper drum 153, a lower drum 165 is provided such that bearings 162 and 163 are installed on the upper and lower portions of a centrallydisposed boss 161 which the drum shaft 150 is put therethrough, and a trans-stator 164 is formed on the outer portion of the boss 161. Under the state of being mounted to a drum base (not shown), the lower drum 165 is installed on the deck 10 of the tape recorder.
A spacer ring 166 is interposed between the rotary disc 151 of the upper drum 153 and the bearing 162 on the upper end of the boss 161 of the lower drum 165, and a spring washer 168 is interposed between the bearing 163 on the lower end of the boss 161 of the lower drum 165 and a bush 167 fixed to the drum shaft 150.
Hereinafter, an assembling method of the drum having the above-stated construction will be described.
First, the bearings 162 and 163 are inserted to be fixed on the upper and lower portions of the boss 161 of the lowe#r drum 165, and the trans-stator 164 is attached on the boss 161, thereby providing the lower drum 165. The rotary disc 151 is pressed to be fixed on the upper end of the drum shaft 150 and the lower surface of the trans-rotor 155 is set to a predetermined height to be fixed with reference to the inner surface of upper end of the rotary disc 151, thereby providing the rotary disc 151. With reference to the upper end of a boss groove 151a of the upper drum 153, an attachment plane of the magnetic head 152 is processed to have a predetermined height, thereby providing the upper drum 153 mounted with the magnetic head 162.
Then, while the inner wheel of the bearing 162 installed on the upper end of the boss 161 of the lower drum 165 is pressed by a predetermined pressure, the spacer ring 166 is interposed between the rotary disc 151 of the upper drum 153 and the bearing 162 on the upper end of the boss 161 of the lower drum in such a manner that a gap between the trans-rotor 155 and trans-stator 164 of the upper and lower drums 153 and 165 is constantly maintained, and the lower drum 165 and the rotary disc 151 are reversed.
Thereafter, the bush 167 is fixed by inserting the spring washer 168 to impose a predetermined pressure upon the inner wheel of the bearing 163 positioned on the lower end of the boss 161.
Lastly, under the state that the upper drum 153 is inserted from the upper portion of the rotary disc 151 assembled to the lower drum 165, the plurality of screws 154 are used to couple the upper drum 153, and the relay 159 connected to the magnetic head 152 is connected to, in the aspect of circuitry, the terminal pin 158 which is already connected to the end of the wire 156 of the trans-rotor 155 via the circuit board 160.
According to the drum of the tape recorder assembled as above, upon rotating the drum shaft fixed to the trans-rotor of the unshown drum motor in high speed, the upper drum 153 and the magnetic head 152 on the upper drum 153 are simultaneously rotated to allow the recording or playing the signal on the tape 14.
However, in the drum of the tape recorder, since the trans-rotor 155 mounted on the rotary disc 151 is connected to the magnetic head 152 attached to the upper drum 153 via the relay 159 and circuit board 160, a plurality of components are required to thus complicate the structure and increase the manufacturing cost owing to additional cost for the components.
In particular, while the inner wheel of the bearing 162 provided on the upper end of the boss 161 of the lower drum 165 is pressed by a predetermined pressure, the spacer ring 166 is interposed between-the trans-rotor 155 and the trans-stator 164 of the upper drum 153 and the lower drum 165 in order to maintain a predetermined gap between them, so that the drum shaft 150 is pressed to be fixed on the inner wheel of the bearing 163 of the lower drum 165, and the upper drum 153 is coupled to the rotary disc 151 by means of the screws 154. Then, the relay 159 connected to the magnetic head 152 on the lower surface of the upper drum 153 is connected to, in the aspect of circuitry, the terminal pin 158 connected to the end of the wire 156 of the trans-rotor 155 via the circuit board 160. Consequently, the assembling operation of the drum is fastidious and complicated to inhibit improvement in the operational efficiency and productivity.
The present invention is devised to solve the above-described problems.
Therefore, it is an object of the present invention to provide a drum of a tape recorder and an assembling method therefor, wherein a trans-rotor is directly fixed on the lower end of a boss of an upper drum which is then directly fixed to a drum shaft, so that cost is economised by removing several components and the assembling process of the drum is simplified and facilitated to improve operational efficiency and productivity.
It is another object of the present invention to provide a drum of a tape recorder and an assembling method therefor, wherein a magnetic head and a trans-rotor are directly connected by means of the end of a wire without requiring a circuit board, a relay and a wire-guiding member, so that the connecting operation of the trans-rotor and magnetic head is further simplified.
To achieve the above object of the present invention, there is provided a drum of a tape recorder which includes an upper drum mounted with a magnetic head on the lower surface thereof, a lower drum installed on the lower portion of the upper drum to be mounted on a deck of the tape recorder, and a drum motor for rotating the upper drum in a predetermined speed. Here, a boss having a boss groove into which a boss of the lower drum is inserted is formed in the upper drum to allow a trans-rotor to be directly attached to the upper drum, and the boss of the upper drum is directly fixed to the upper end of a drum shaft.
To achieve another object of the present invention, there is provided a method for assembling a drum of a tape recorder, which includes the steps of:
providing a lower drum by inserting bearings respectively in the upper and lower portions of a boss thereof and attaching a trans-stator on the boss, and an upper drum on the upper end of a drum shaft by processing an attachment plane of a magnetic head and the lower end of a boss thereof by a predetermined height with reference to the lower end of boss groove of the upper drum mounted with the magnetic head and a trans-rotor;;
interposing a spacer ring between the boss of the upper drum and the bearing on the upper end of the boss of the lower drum so as to maintain a gap between the transstator and trans-rotor of the upper and lower drums under the state of pressing the inner wheel of the bearing installed on the upper end of the boss of the lower drum in a predetermined pressure, and fixing a bush to the lower portion of the drum shaft while interposing a spring washer under the state of pressing the inner wheel of the bearing on the lower end of the boss of the lower drum in a predetermined pressure.
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:
Figure 1 is a plan view schematically showing a portion of a general tape recorder;
Figure 2 is an exploded perspective view showing only the drum of figure 1, which is the main portion in a conventional technique;
Figure 3 is a sectional view showing the assembled state of figure 2;
Figure 4 is an exploded perspective view showing a drum of a tape recorder according to the present invention; and
Figure 5 is a sectional view showing the assembled state of figure 4.
Referring to figures 4 and 5 which illustrate a drum of a tape recorder and its assembling method according to the present invention, an upper drum 253 is directly fixed on the upper end of a drum shaft 150 rotated by means of a drum motor (not shown). The upper drum 253 includes a boss 255 with a boss groove 254 extending longer than a head attachment plane 256 to stably hold a boss 161 of a lower drum 165, and a trans-rotor 155 is attached on the lower surface of the boss 255. A magnetic head 152 is fixed to the head attachment plane 256 by means of a screw 257 which is a coupling member.
On the lower side of the upper drum 253, the lower drum 165 is provided such that bearings 162 and 163 are formed on the upper and lower portions of the centrallydisposed boss 161 which the drum shaft 150 is put therethrough, and a trans-stator 164 is formed on the outer portion of the boss 161. Under the state of being mounted to a drum base (not shown), the lower drum 165 is placed on the deck 10 of the tape recorder.
A rotary trans is realised by allowing the trans-rotor 155 to be rotated while the trans-rotor 155 is adjacently opposed to the trans-stator 164.
The magnetic head 152 and trans-rotor 155 are directly connected to each other by means of the end of the wire 156 of the trans-rotor 155.
A spacer ring 166 is inserted between the boss groove 254 of the upper drum 253 and the bearing 162 on the upper end of the boss 161 of the lower drum 165, and a spring washer 168 is interposed between the bearing 163 on the lower end of the boss 161 of the lower drum 165 and a bush 167 fixed to the drum shaft 150.
The drum shaft 150 and the upper drum 253 may be fixed by a common hot or cold rolling or by an adhesive to be adhered to each other.
An assembling method of the drum having the above-stated construction will be described in detail below.
First, the bearings 162 and 163 are inserted on the upper and lower portions of the boss 161 of the lower drum 165, respectively, and the trans-stator 164 is attached on the boss 161, thereby providing the lower drum 165. With reference to the lower end of the boss groove 254 of the upper drum 253, the head attachment plane 256 and the lower end of the boss 155 are processed to have a predetermined height, thereby providing the upper drum 253 having the magnetic head 152 and the trans-rotor 155 on the upper end of the drum shaft 150.
Then, while the inner wheel of the bearing 162 installed on the upper end of the boss 161 of the lower drum 165 is pressed by a predetermined pressure, the spacer ring 166 is interposed between the trans-rotor 155 of the upper drum 253 and the bearing 162 on the upper end of the boss 161 of the lower drum 165, so as to constantly maintain a predetermined gap between the trans-rotor 155 and trans-stator 164 of the upper drum 253 and the lower drum 165 which together realise the rotary trans. Thereafter, under the state that the inner wheel of the bearing 163 positioned on the lower end of the boss 161 of the lower drum 165 is pressed by a predetermined force, the bush 167 is fixed to the lower portion of the drum shaft 150 by means of the screw 169 which is the coupling member, inserting the spring washer 168.
The inner wheel of the bearing 162 installed on the upper end of the boss 161 of the lower drum 165 must be set to maintain the pressure imposed by the upper drum 253 during assembling, which ranges from 1.5 to 2.1kg/cm2 and, preferably, is 1.8kg/cm2.
Concerning the rotary trans, the gap between the trans-rotor 155 and the transstator 164 may be varied according to the working operation, but 50#m is the most preferable.
According to the drum of the tape recorder assembled as above, upon supplying a power to the drum motor, the drum shaft 150 is rotated to directly rotate the upper drum
253 which is pressed to be fixed on the upper end of the drum shaft 150, so that the
magnetic head 152 is simultaneously rotated to thus play the signal recorded on the tape
14 or record a signal thereon.
In the drum of the tape recorder and the assembling method therefor according to
the present invention, the trans-rotor 155 is directly disposed on the lower end of the
boss 255 of the upper drum 253 which is then installed to be directly fixed to the drum
shaft 150. Therefore, the conventionaily-requisite components such as the rotary disc
151, circuit board 160, relay 159 and wire-guiding member 157 are deleted to cut down
cost.
Furthermore, the drum shaft 150 to which the upper drum 253 is pressed to be
fixed on the upper end thereof is put into the boss 161 of the lower drum 165 such that
the gap between the trans-rotor 155 and the trans-stator 164 is maintained at 50cm, which simplifies and facilitates the assembling operation of the drum with the
consequence of improving the operational efficiency and productivity.
Because the magnetic head 152 and the trans-rotor 155 are directly connected to
each other by means of the end of the wire 156 of the trans-rotor 155 without using the
circuit board 160, relay 159 and wire-guiding member 157 which are the requisite
components according to the conventional technique, the process for connecting the
trans-rotor 155 and the magnetic head 152 becomes simplified.
According to the drum of the tape recorder and the assembling method therefor as described above, a trans-rotor is installed to be directly fixed to an upper drum which in turn directly fixed to a drum shaft. As a result, several components are eliminated to economise the cost, a process for connecting a trans-rotor to a magnetic head is
simplified, and the assembling of the drum is simplified and facilitated, thereby
improving the operational efficiency and productivity.
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 scope of the invention as defined by the appended claims.
Claims (7)
1. A drum of a tape recorder including an upper drum mounted with a magnetic head on the lower surface thereof, a lower drum installed on the lower portion of said upper drum to be mounted on a deck of said tape recorder, and a drum motor for rotating said upper drum in a predetermined speed, wherein
a boss having a boss groove into which a boss of said lower drum is inserted is formed in said upper drum to allow a trans-rotor to be directly attached to said upper drum, said boss of said upper drum being directly fixed to the upper end of a drum shaft.
2. A drum of a tape recorder as claimed in claim 1, wherein said magnetic head and said trans-rotor mounted to said upper drum are directly connected to each other by means of the end of a wire.
3. A method for assembling a drum of a tape recorder comprising the steps of:
providing a lower drum by inserting bearings respectively in the upper and lower portions of a boss thereof and attaching a trans-stator on said boss, and an upper drum on the upper end of a drum shaft by processing an attachment plane of a magnetic head and the lower end of a boss thereof by a predetermined heights with reference to the lower end of said boss groove of said upper drum mounted with said magnetic head and a trans-rotor;;
interposing a spacer ring between said boss of said upper drum and said bearing on the upper end of said boss of said lower drum so as to maintain a gap between said trans-stator and trans-rotor of said upper and lower drums under the state of pressing the inner wheel of said bearing installed on the upper end of said boss of said lower drum in a predetermined pressure, and fixing a bush to the lower portion of said drum shaft while interposing a spring washer under the state of pressing the inner wheel of said bearing on the lower end of said boss of said lower drum in a predetermined pressure.
4. A method for assembling a drum of a tape recorder as claimed in claim 3, wherein the pressure imposed upon said inner wheel of said bearing is 1.8kg/cm.
5. A method for assembling a drum of a tape recorder as claimed in claim 3, wherein said gap between said trans-rotor and trans-stator is kept by 50cm.
6. A drum of a tape recorder substantially as hereinbefore described with reference to and as illustrated in figures 4 and 5 of the accompanying drawings.
7. A method for assembling a drum of a tape recorder, substantially as hereinbefore described with reference to and as illustrated in figures 4 and 5 of the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR920021109 | 1992-10-30 | ||
| KR1019930021246A KR940009944A (en) | 1992-10-30 | 1993-10-14 | Drum unit and drum assembly method of tape recorder |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9322391D0 GB9322391D0 (en) | 1993-12-15 |
| GB2272988A true GB2272988A (en) | 1994-06-01 |
| GB2272988B GB2272988B (en) | 1996-08-07 |
Family
ID=26629353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9322391A Expired - Fee Related GB2272988B (en) | 1992-10-30 | 1993-10-29 | Drum of a tape recorder and an assembling method therefor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH06342545A (en) |
| CN (1) | CN1059510C (en) |
| GB (1) | GB2272988B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2314449A (en) * | 1996-06-19 | 1997-12-24 | Daewoo Electronics Co Ltd | Assembly method, including soldering, for a head drum used in a digital VCR |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0107235A1 (en) * | 1982-10-11 | 1984-05-02 | Koninklijke Philips Electronics N.V. | Magnetic-tape scanning device and method of manufacturing such a device |
| EP0336422A2 (en) * | 1988-04-08 | 1989-10-11 | Sharp Kabushiki Kaisha | Magnetic head carrier drum assembly |
| EP0494640A2 (en) * | 1991-01-08 | 1992-07-15 | Sharp Kabushiki Kaisha | Rotary head assembly |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0433573Y2 (en) * | 1987-03-19 | 1992-08-11 |
-
1993
- 1993-10-29 GB GB9322391A patent/GB2272988B/en not_active Expired - Fee Related
- 1993-10-30 CN CN93120719A patent/CN1059510C/en not_active Expired - Fee Related
- 1993-11-01 JP JP5273496A patent/JPH06342545A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0107235A1 (en) * | 1982-10-11 | 1984-05-02 | Koninklijke Philips Electronics N.V. | Magnetic-tape scanning device and method of manufacturing such a device |
| EP0336422A2 (en) * | 1988-04-08 | 1989-10-11 | Sharp Kabushiki Kaisha | Magnetic head carrier drum assembly |
| EP0494640A2 (en) * | 1991-01-08 | 1992-07-15 | Sharp Kabushiki Kaisha | Rotary head assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2314449A (en) * | 1996-06-19 | 1997-12-24 | Daewoo Electronics Co Ltd | Assembly method, including soldering, for a head drum used in a digital VCR |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2272988B (en) | 1996-08-07 |
| GB9322391D0 (en) | 1993-12-15 |
| CN1059510C (en) | 2000-12-13 |
| JPH06342545A (en) | 1994-12-13 |
| CN1088706A (en) | 1994-06-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19991029 |