GB2221338A - Position adjusting device for audio head - Google Patents
Position adjusting device for audio head Download PDFInfo
- Publication number
- GB2221338A GB2221338A GB8911220A GB8911220A GB2221338A GB 2221338 A GB2221338 A GB 2221338A GB 8911220 A GB8911220 A GB 8911220A GB 8911220 A GB8911220 A GB 8911220A GB 2221338 A GB2221338 A GB 2221338A
- Authority
- GB
- United Kingdom
- Prior art keywords
- horizontal position
- support shaft
- mounting plate
- position adjusting
- head mounting
- 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- Withdrawn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
- 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
- G11B5/56—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 provision for moving the head support for the purpose of adjusting the position of the head relative to the record carrier, e.g. manual adjustment for azimuth correction or track centering
Abstract
A device which facilitates fine adjustment of the position of an audio head of a video tape recorder comprises a horizontal position adjusting mechanism 10 which includes a stopper element 11. Stopper element 11 is located on a main base plate 1 or (Fig 3) a head mounting plate 4 and is inclined relative to a support shaft 3. Support shaft 3 is secured to the main base plate 1 and head mounting plate 4 is supported for axial and pivotal movement along and around it. A horizontal position adjusting member 12 (or 16 Fig 5) contacts stopper element 11 and slides, when it is manually turned, along it to adjust the horizontal position of the head mounting plate 4 against the force of a resilient member 7. The horizontal position adjusting member 12 (or 16 Fig 5) may be either a screw 12 screwed into plates 1 or 4 not carrying stopper element 11 or a nut (16) screwed on a bolt (15, Fig 5) which is secured to the main base plate 1. <IMAGE>
Description
DEVICE FOR FINELY ADJUSTING POSITION
OF AUDIO HEAD OF VIDEO TAPE RECORDER
BACKGROUND OF INVENTION 1) Field of the Invention
This invention relates to a device for finely adjusting the position of an audio head of a video tape recorder with respect to a rotary head cylinder.
2) DescriPt~on o the Prior Art A head adjusting device for a video tape recorder wherein the vertical position of a head is adjusted by means of a vertical position adjusting nut and the horizontal position of the head is adjusted by means of a horizontal position adjusting tapered nut is already known and disclosed, for example, in Japanese Patent
Publication No. 62-13221.
A tapered nut in such head adjusting device requires a plurality of machining steps for formation of a tapered face and for formation of a groove in an upper wall thereof. Accordingly, there is a drawback that it requires a high cost.
SUMMARY OFTHE INVENTION
It is an object of the present invention to provide a device for finely adjusting the position of an audio head of a video tape recorder which facilitates fine adjustment of the position of an audio head without using a part which is difficult to manufacture.
In order to attain the object described above, according to one aspect of the present invention, there is provided a device for finely adjusting the position of an audio head of a vide tape recorder which includes a main base plate, a support shaft mounted uprightly on the main base plate and having a threaded portion at an end portion thereof remote from the main base plate, a head mounting plate supported for up and down movement on and for pivotal motion around the support shaft and carrying the audio head thereon, a resilient member for biasing the head mounting plate in an axial direction of and in a circumferential direction around the support shaft, a vertical position adjusting nut screwed on the threaded portion of the support shaft for defining the vertical position of the head mounting plate against the biasing force of the resilient member, and a horizontal position adjusting mechanism for defining the horizontal position of the head mounting plate against the biasing force of the resilient member, characterized in that the horizontal position adjusting mechanism includes a stopper element provided on one of the main base plate and the head mounting plate in an inclined relationship to the support shaft, and a horizontal position adjusting screw screwed in the other of the main base plate and the head mounting plate in a parallel relationship to the support shaft, and that either a head portion or an end portion of the horizontal position adjusting screw is contacted directly or indirectly with the stopper element under the circumferential biasing force of the resilient member so that the horizontal position of the head mounting plate around the support shaft may be adjusted by turning the horizontal position adjusting screw.
With the device, the head or the end of the horizontal position adjusting screw is normally held in direct or indirect contact with the stopper element under the circumferential biasing force of the resilient member. Accordingly, if the horizontal position adjusting screw is turned in one or the other direction, the head or the end of the horizontal position adjusting screw slides on the inclined stopper element whereupon the head mounting plate is pivoted around the support shaft, thereby achieving fine adjustment of the positional relationship between a rotary head cylinder and the audio head of the video tape recorder.
The device of the present invention thus eliminates use of such a tapered nut which is difficult to produce as is employed in a conventional adjusting device. Accordingly, the device can be produced at a reduced cost. Besides, the device facilitates fine adjustment of the position of the audio head.
According to another aspect of the present invention, there is provided a device for finely adjusting the position of an audio head of a vide tape recorder which includes a main base plate, a support shaft mounted uprightly on the main base plate and having a threaded portion at an end portion thereof remote from the main base plate, a head mounting plate supported for up and down movement on and for pivotal motion around the support shaft and carrying the audio head thereon, a resilient member for biasing the head mounting plate in an axial direction of and in a circumferential direction around the support shaft, a vertical position adjusting nut screwed on the threaded portion of the support shaft for defining the vertical position of the head mounting plate against the biasing force of the resilient member, and a horizontal position adjusting mechanism for defining the horizontal position of the head mounting plate against the biasing force of the resilient member, characterized in that the horizontal position adjusting mechanism includes a stopper element provided on the head mounting plate in an inclined relationship to the support shaft, a bolt secured uprightly to the main base plate in a parallel relationship to the support shaft, and a horizontal position adjusting nut screwed on the bolt and held in contact with the stopper element under the circumferential biasing force of the resilient member so that the horizontal position of the head mounting plate around the support shaft may be adjusted by turning the horizontal adjusting nut.
With the device, the horizontal position adjusting nut is normally held in contact with the stopper element under the circumferential biasing force of the resilient member. Accordingly, if the horizontal position adjusting nut is turned in one or the other direction, it slides on the inclined stopper element whereupon the head mounting plate is pivoted around the support shaft, thereby achieving fine adjustment of the positional relationship between a rotary head cylinder and the audio head of the video tape recorder.
The device is advantageous, in addition to the advantages of the invention described above, in that since the bolt on which the horizontal position adjusting nut is screwed is secured to the main base plate, the position of the same with respect to the stopper element only depends upon the position of the same on the bolt, which assures more accurate adjustment of the position of the audio head.
Specific embodiments of the present invention will now be described in detail by way of example with reference to the accompanying drawings in which like reference characters designate like or corresponding parts through the several views.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a device for finely adjusting the position of an audio head of a video tape recorder showing a first preferred embodiment of the present invention;
FIG. 2 is a vertical sectional view taken along line II-II of FIG. 1;
FIG. 3 is a view similar to FIG. 1 but showing a second preferred embodiment of the present invention;
FIG. 4 is a vertical sectional view taken along line IV-IV of FIG. 3;
FIG. 5 is a similar view but showing a third preferred embodiment of the present invention; and
FIG. 6 is a perspective view of a horizontal position adjusting nut of the device shown in FIG. 5.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
Referring first to FIGS. 1 and 2, there is shown a device for finely adjusting the position of an audio head of a video tape recorder according to a first preferred embodiment of the present invention. The device shown includes a main base plate 1, and a support shaft 3 secured to and extending vertically upwardly from the main base plate 1. The support shaft 3 is threaded at an upper end portion 2 thereof. A head mounting plate 4 is supported for up and down movement on and for pivotal motion around the support shaft 3 by way of a sleeve 4a secured to the head mounting plate 4 and fitted on the support shaft 3. An audio head 5 is mounted on a support plate Sa secured to an upper face of the head mounting plate 4 such that azimuth adjustment thereof may be made by means of an azimuth adjusting screw 6.The head mounting plate 4 is normally biased in an axially upward direction along and also in a predetermined circumferential direction (counterclockwise direction in FIG. 1) around the support shaft 3 by a resilient member 7 in the form of a torsion coil spring located below the head mounting plate 4. The spring 7 has an intermediate coiled portion 7a loosely fitted around the support shaft 3, and one end portion 7b of the spring 7 is held in engagement with a spring arresting portion 8 in the form of a bent lug of the head mounting plate 4 while the other end portion 7c of the spring 7 is held in engagement with an outer periphery of a screw seat 13 of a horizontal position adjusting mechanism 10 which will be hereinafter described.
A vertical position adjusting nut 9 is screwed on the threaded portion 2 of the support shaft 3 for abutting engagement with the top end of the sleeve 4a to limit axially upward movement of the head mounting plate 4 against biasing force of the spring 7. To the contrary, pivotal motion of the head mounting plate 4 in the predetermined circumferential direction by the resilient force of the spring 7 is limited by the horizontal position adjusting mechanism 10.
The horizontal position adjusting mechanism 10 includes a stopper element 11 and a horizontal position adjusting screw 12. The stopper element 11 is formed as a bent lug of the head mounting plate 4 which is bent obliquely downwardly from an end portion of the head mounting plate 4 with a predetermined inclination with respect to the support shaft 3. Meanwhile, the horizontal position adjusting screw 12 is formed as a headed bolt having a threaded portion 12a screwed in a threaded hole 13a of the screw seat 13 which is in turn formed as a short cylinder secured to the main base plate 1. A collar 12c having a significantly greater outer diameter than a head 12b of the horizontal position adjusting screw 12 is loosely fitted on a portion below the head 12b of the horizontal position adjusting screw 12.The head 12b of the horizontal position adjusting screw 12 is normally held in contact with the stopper element 11 with the collar 12c interposed therebetween. If the horizontal position adjusting screw 12 is turned to move toward or from the screw seat 13, the position at which the head 12b of the horizontal position adjusting screw 12, or more particularly an outer periphery of the collar 12c, engages with the stopper element 11 is varied because the stopper element 11 is inclined with respect to the support shaft 3 and also to the horizontal position adjusting screw 12, thereby adjusting the limit position of the head mounting plate 4 in the predetermined circumferential direction.
Fine adjustment of the vertical position of the audio head 5 is effected by adjustment of the vertical position adjusting nut 9. In particular, since the head mounting plate 4 is normally biased axially upwardly in
FIG. 2 by the spring 7, if the vertical position adjusting nut 9 is tightened or turned to move downwardly along the support shaft 3, then the head mounting plate 4 is moved down along the support shaft 3 against the axial upward biasing force of the spring 7 by the vertical position adjusting nut 9. On the contrary, if the vertical position adjusting nut 9 is loosened or turned to move upwardly along the support shaft 3, then the head mounting plate 4 is allowed to be moved axially upwardly along the support shaft 3 by the axial upward biasing force of the spring 7. The vertical position of the audio head 5 is thus adjusted by way of the head mounting plate 4.
Fine adjustment of the horizontal position of the audio head 5 is effected by adjustment of the horizontal position adjusting screw 12. In particular, since the head mounting plate 4 is normally biased to pivot in the counterclockwise direction in FIG. 1 by the spring 7, if the horizontal position adjusting screw 12 is tightened or turned to move the collar 12c axially downwardly together therewith, then the collar 12c slides downwardly on the inclined stopper element 11 whereupon the head mounting plate 4 is pivoted in the clockwise direction in FIG. 1 around the support shaft 3 against the counterclockwise biasing force of the spring 7 by a component of force which acts between the collar 12c and the stopper face 11.On the contrary, if the horizontal position adjusting screw 12 is loosened or turned to move axially upwardly, then the collar 12c slides upwardly on the inclined stopper element 11 whereupon the head mounting plate 4 is allowed to be pivoted in the counterclockwise direction in FIG. 1 around the support shaft 3 by the counterclockwise biasing force of the spring 7. The horizontal position of the audio head 5 is thus adjusted by way of the head mounting plate 4.
It is to be noted that while in the embodiment of
FIGS. 1 and 2 the collar 12c fitted on the portion below the head 12b of the horizontal position adjusting screw 12 is held in contact with the stopper element 11, it may otherwise be omitted and instead the head 12b of the horizontal position adjusting screw 12 may be held in direct contact with the stopper elementll. Meanwhile, in order to assure smooth sliding movement of the collar 12c on the stopper element 11, preferably the lower circumferential edge of the collar 12 should be rounded or chamfered.
Referring now to FIGS. 3 and 4, there is shown a device for finely adjusting the position of an audio head of a video tape recorder according to a second preferred embodiment of the present invention. The device is generally similar in construction to the device of the first embodiment shown in FIGS. 1 and 2 but is different in that a stopper element 11 is provided on a main base plate 1 while a horizontal position adjusting screw 12 is provided on a head mounting plate 4, and an end 7c of a torsion coil spring 7 is normally held in engagement with a spring arresting portion 14 in the form of a bent lug provided on the main base plate 1. In particular, a threaded portion 12a of the horizontal position adjusting screw 12 is screwed in a threaded hole 13a of a screw seat 13 secured to the head mounting plate 4.Meanwhile, the stopper element 11 is formed as a bent lug of the main base plate 1 at such a location that it is normally contacted by a lower end 12d of the horizontal position adjusting screw 12 under biasing force of the spring 7.
If the horizontal position adjusting screw 12 is tightened or turned to move axially downwardly relative to the screw seat 13, the lower end thereof slides downwardly along the inclined stopper element 11 whereupon the head mounting plate 4 is pivoted in the clockwise direction in FIG. 3 against the counterclockwise biasing force of the spring 7 by a component of force which acts between the lower end 12d of the horizontal position adjusting screw 12 and the stopper element 11. On the contrary, if the horizontal position adjusting screw 12 is loosened or turned to move axially upwardly relative to the screw seat 13, then the lower end thereof slides upwardly along the inclined stopper element 11 whereupon the head mounting plate 4 is pivoted in the counterclockwise direction in
FIG. 3 by the counterclockwise biasing force of the spring 7.Accordingly, also in the case of the present embodiment, the horizontal position of the audio head 5 can be adjusted by turning the horizontal position adjusting screw 12 in the clockwise or counterclockwise direction. It is to be noted that the circumferential edge of the lower end 12d of the horizontal position adjusting screw 12 should be rounded or chamfered in order to assure smooth sliding movement of the lower end 12 of the horizontal position adjusting screw 12 on the stopper element 11.
Referring now to FIGS. 5 and 6, there is shown a device for finely adjusting the position of an audio head of a video tape recorder according to a third preferred embodiment of the present invention. The device is generally similar in construction to the device of the first embodiment shown in FIGS. 1 and 2 but is different in that a bolt 15 is securely mounted on a main base plate 1 and extends uprightly in parallel to a support shaft 3 and a horizontal position adjusting nut 16 having a slit 16a formed at the top thereof for receiving a tool therein as shown in FIG. 6 is screwed on a threaded portion 15a of the bolt 1D such that it may normally contact with a stopper element 11 formed as a bent lug on a head mounting plate 4 under biasing force of a torsion coil spring 7.
If the horizontal position adjusting nut 16 is tightened or turned to move axially downwardly relative to the bolt 15, a lower outer circumferential edge 16b thereof slides downwardly along the inclined stopper element 11 whereupon the head mounting plate 4 is pivoted in one circumferential direction against biasing force of the spring 7 by a component of force which acts between the horizontal position adjusting nut 16 and the stopper element 11. On the contrary, if the horizontal position adjusting nut 16 is loosened or turned to move axially upwardly relative to the bolt 15, then it slides upwardly along the inclined stopper element 11 whereupon the head mounting plate 4 is pivoted in the other direction by the biasing force of the spring 7.
Accordingly, the horizontal position of the audio head 5 is adjusted by turning the horizontal adjusting nut 16 in the clockwise or counterclockwise direction. It is to be noted that the lower circumferential edge 16b is either rounded or chamfered in order to assure smooth sliding movement of the same on the stopper element 11.
Comparing with the devices shown in FIGS. 1 and 2 and FIGS. 3 and 4, the device of the embodiment shown in
FIGS. 5 and 6 is advantageous in that more accurate adjustment of the position of the audio head is attained. In particular, in the devices shown in
FIGS. 1 to 4, the horizontal position of the audio head 5 is adjusted by turning the horizontal position adjusting screw 12. The horizontal position adjusting screw 12, however, engages at a portion thereof spaced by a significantly great distance from the threaded portion 12a thereof at which it is mounted on the main base plate 1 or the head mounting plate 4. Accordingly, the horizontal position adjusting screw 12 must be formed with a high degree of accuracy free from distortion. Otherwise, turning of the horizontal position adjusting screw 12 may move the threaded portion 12a laterally by an unexpectedly great or small distance, which will disable fine adjustment of the horizontal position of the audio head 5. To the contrary, with the device shown in FIGS. 5 and 6, since the bolt is secured to the main base plate and the horizontal position adjusting nut is screwed on the fixed bolt, the horizontal position of the audio head only depends upon the position of the horizontal position adjusting nut on the bolt, which assures accurate positioning of the audio head.
Claims (4)
1. A device for finely adjusting the position of an audio head of a video tape recorder which includes a main base plate, a support shaft mounted uprightly on said main base plate and having a threaded portion at an end portion thereof remote from said main base plate, a head mounting plate supported for up and down movement on and for pivotal motion around said support shaft and carrying said audio head thereon, a resilient member for biasing said head mounting plate in an axial direction of and in a circumferential direction around said support shaft, a vertical position adjusting nut screwed on said threaded portion of said support shaft for defining the vertical position of said head mounting plate against the biasing force of said resilient member, and a horizontal position adjusting mechanism for defining the horizontal position of said head mounting plate against the biasing force of said resilient member, characterised in that said horizontal position adjusting mechanism includes a stopper element provided on one of said main base plate and said head mounting plate in an inclined relationship to said support shaft, and a horizontal position adjusting screw screwed in the other of said main base plate and said head mounting plate in a parallel relationship to said support shaft, and that either a head portion or an end portion of said horizontal position adjusting screw is contacted directly or indirectly with said stopper element under the circumferential biasing force of said resilient member so that the horizontal position of said head mounting plate around said support shaft may be adjusted by turning said horizontal position adjusting screw.
2. A device for finely adjusting the position of an audio head of a video tape recorder which includes a main base plate, a support shaft mounted uprightly on said main base plate and having a threaded portion at an end portion thereof remote from said main base plate, a head mounting plate supported for up and down movement on and for pivotal motion around said support shaft and carrying said audio head thereon, a resilient member for biasing said head mounting plate in an axial direction of and in a circumferential direction around said support shaft, a vertical position adjusting nut screwed on said threaded portion of said support shaft for defining the vertical position of said head mounting plate against the biasing force of said resilient member, and a horizontal position adjusting mechanism for defining the horizontal position of said head mounting plate against the biasing force of said resilient member, characterised in that said horizontal position adjusting mechanism includes a stopper element provided on said head mounting plate in an inclined relationship to said support shaft, a bolt secured uprightly to said main base plate in a parallel relationship to said support shaft, and a horizontal position adjusting nut screwed on said bolt and held in contact with said stopper element under the circumferential biasing force of said resilient member so that the horizontal position of said head mounting plate around said support shaft may be adjusted by turning said horizontal adjusting nut.
3. A device as claimed in claim 2, wherein said horizontal position adjusting nut is either rounded or chamfered at a circumferential edge thereof at which said horizontal position adjusting nut contacts with said stopper element.
4. A device for finely adjusting the position of an audio head of a video tape recorder substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10077388U JPH0226114U (en) | 1988-07-29 | 1988-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8911220D0 GB8911220D0 (en) | 1989-07-05 |
| GB2221338A true GB2221338A (en) | 1990-01-31 |
Family
ID=14282805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8911220A Withdrawn GB2221338A (en) | 1988-07-29 | 1989-05-16 | Position adjusting device for audio head |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0226114U (en) |
| CN (1) | CN2051381U (en) |
| GB (1) | GB2221338A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2241818A (en) * | 1990-03-02 | 1991-09-11 | Tanashin Denki Co | Mechanism for adjusting the position of the magnetic head of a VTR |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008053380A (en) * | 2006-08-23 | 2008-03-06 | Hamamatsu Photonics Kk | Laser device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0089645A2 (en) * | 1982-03-19 | 1983-09-28 | Hitachi, Ltd. | Magnetic head adjusting device |
-
1988
- 1988-07-29 JP JP10077388U patent/JPH0226114U/ja active Pending
-
1989
- 1989-05-15 CN CN89207287U patent/CN2051381U/en not_active Withdrawn
- 1989-05-16 GB GB8911220A patent/GB2221338A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0089645A2 (en) * | 1982-03-19 | 1983-09-28 | Hitachi, Ltd. | Magnetic head adjusting device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2241818A (en) * | 1990-03-02 | 1991-09-11 | Tanashin Denki Co | Mechanism for adjusting the position of the magnetic head of a VTR |
| GB2241818B (en) * | 1990-03-02 | 1994-05-04 | Tanashin Denki Co | Mechanism for adjustng the position of the mechanism head of a video tape recorder and/or player |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8911220D0 (en) | 1989-07-05 |
| JPH0226114U (en) | 1990-02-21 |
| CN2051381U (en) | 1990-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5072557A (en) | Device for fixing floor panels | |
| US4687170A (en) | Camera mounting bracket | |
| GB2221338A (en) | Position adjusting device for audio head | |
| US5175659A (en) | Mechanism for adjusting the position of the magnetic head of a vtr | |
| US5746000A (en) | Headlamp assembly with magnetic indicator for horizontal and vertical positioning | |
| US5610779A (en) | Floppy disk drive | |
| US5479307A (en) | Audio head position adjusting device for a video cassette recorder | |
| US5572389A (en) | Audio head position adjusting device for a video cassette recorder | |
| US5082223A (en) | Adjustable mounting assembly for electro-optical devices | |
| JPH0222808Y2 (en) | ||
| KR910007640Y1 (en) | Position regulating device for vtr audio head | |
| JPS6346895Y2 (en) | ||
| KR910007639Y1 (en) | Audio head position regulating device for vtr | |
| JPS6235148Y2 (en) | ||
| JPS60104812U (en) | Preset mechanism for lens barrel distance adjustment ring | |
| JPH075536Y2 (en) | Magnetic head position adjustment mechanism | |
| JPH045038Y2 (en) | ||
| JPH0220394Y2 (en) | ||
| JP3003021U (en) | Overhead projector | |
| JPH0229358Y2 (en) | ||
| JPS5814419Y2 (en) | Jikihetsudo Chiyosouchi | |
| JPH04219663A (en) | Tape guide device | |
| JPS634262Y2 (en) | ||
| JPH079229Y2 (en) | Tape guide device | |
| KR100271145B1 (en) | Apparatus for mounting rotatable head cylinder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |