CN1011445B - Magnetic head supporting device of tape-recorder - Google Patents
Magnetic head supporting device of tape-recorderInfo
- Publication number
- CN1011445B CN1011445B CN 89102004 CN89102004A CN1011445B CN 1011445 B CN1011445 B CN 1011445B CN 89102004 CN89102004 CN 89102004 CN 89102004 A CN89102004 A CN 89102004A CN 1011445 B CN1011445 B CN 1011445B
- Authority
- CN
- China
- Prior art keywords
- magnetic head
- tape
- counter
- magnetic
- head
- 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
Images
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
- G11B5/54—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 into or out of its operative position or across tracks
- G11B5/55—Track change, selection or acquisition by displacement of the head
- G11B5/5513—Specially adapted for transducing in both travelling directions of tape
- G11B5/5517—Controlled by automatic tape drive reversing arrangement
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
To correctly judge the stability of combustion in idling state by sampling and holding the positive and negative peak values of the revolution speed signal of an engine and measuring the value which is obtained by subtracting the negative peak value from the positive peak value.A revolution speed signal is inputted from an input terminal 1. The revolution speed signal is inputted into a peak detector 2 for detecting a positive peak, peak detector 3 for detecting a negative peak, and a comparator 5. The difference of the holding outputs by the holding device 8 and 9 is calculated by a difference amplifier 10. The result of the calculation is inputted into a comparator 12. Into the comparator 12, also a level signal L set by a level setting device 13 is inputted. When the result of calculation is increased by the level signal L, the generation of the unstable state of combustion in idle state is judged. Therefore, the stability of the combustion in idling state can be correctly judged.
Description
The present invention relates to have the cassette tape recorder of automatic reversing apparatus, particularly to conversion along with tape running direction, the improvement of the tape recorder head bracing or strutting arrangement that the magnetic head counter-rotating is 180 °.
In having the cassette tape recorder of automatic reversing apparatus, along with the conversion of tape running direction, the machine that the magnetic head counter-rotating is 180 ° is a kind of type wherein.The head support device for magnetic of this blattnerphone, its structure is shown in the 6th figure.That is: the magnetic head erecting bed 62 of magnetic head 61 is housed, stretch out into block 63, and be connected with axially extended rotating shaft 64, rotating shaft 64 is by bearing 65 supportings, gear 66 is fixed on the end of rotating shaft 64, with suitable method gear 66 is rotated, because block 63 joins with fixed position, then magnetic head 61 remains on the set backward position.
But there is following problems in this device.That is: in order to make magnetic head 61 slick and sly counter-rotatings, require between rotating shaft 64 and bearing 65, to keep the gap of appropriateness, yet, because the existence in this gap will make magnetic head accurately locate, then be difficult.Because magnetic head 61 accurately locate, cause the mutual alignment relation distribution of magnetic head 61 and tape to change, thereby the acoustic characteristic when significantly having reduced recording and playback.
For this reason, in existing head support device for magnetic,,, fixed a tape guidance bar 67 in the side of magnetic head 61 in order to keep the certain mutual alignment relation of magnetic head 61 and tape.But, because tape guidance bar 67 has been fixed in the side of magnetic head 61, then when the conversion tape running direction, must magnetic head be retreated outside box, readvance after waiting to reverse, with the contact with tape in the box.For this reason, will increase the mechanism of the counter-rotating magnetic head 61 shown in the 7th figure (a), and also the mechanism that moves forward and backward magnetic head 61 must be set, therefore, have the problem of structure complicated.In addition, because when counter-rotating magnetic head 61, all will retreat outside box, the direction switching motion of tape can not be carried out rapidly, this also is a problem that exists.
And, because the tape surface is adhered to dust and dirt easily, when the conversion tape running direction, magnetic head will leave tape, could contact once more after the counter-rotating, therefore, between tape and magnetic head, to carry some dust and dirt secretly, the main cause that acoustic characteristic that Here it is degenerates, simultaneously, this also is the main cause that magnetic head and tape degenerate rapidly.
The objective of the invention is: a kind of head support device for magnetic of cassette tape recorder is provided, magnetic head is stood fast, just can in box, reverse.Thereby also can prevent to carry dust and dirt between tape and magnetic head secretly the actuation time when making designs simplification and shortening the tape running direction conversion, reaches the purpose of protection magnetic head and tape.
Technology of the present invention constitutes: at least at the rotatable parts that magnetic head is housed or support either party of its parts of bearings that freely rotates, the formation taper surface acts on counter-force on the magnetic head by tape, taper surface is contacted, so that head position with corresponding component.
Owing to rely on taper surface to determine the position of magnetic head, therefore can save the tape guidance bar, magnetic head is reversed in tape cassete.And according to the technical program, magnetic head stands fast just can finish the conversion of tape running direction, also can shorten its conversion action time.
In addition, during owing to the conversion tape running direction, magnetic head is that sliding friction contacts with tape, and therefore when switching motion, tape and head surface can be cleaned.
The 1st figure to the 3 figure are one embodiment of the present of invention, the 1st figure is the cut-open view of head support device for magnetic, the 2nd figure (a) is the skeleton view of explanation magnetic head rotation situation, figure (b) is the front elevation of expression magnetic head and box relation, the 3rd figure is the skeleton view of expression magnetic head and tape guidance bar relation, the 4th figure and the 5th figure are the cut-open views of head support device for magnetic among other embodiment, the 6th figure and the 7th figure (a), (b) be prior art, the 6th figure is the cut-open view of head support device for magnetic, the 7th figure (a) is the view of explanation magnetic head rotation situation, and figure (b) is the front elevation of expression magnetic head and tape cassete relation.
The 1st figure to the 3 figure are one embodiment of the present of invention, and magnetic head 11 is fixed on the magnetic head erecting bed 12 cylindraceous.Rotatable parts are formed by the block 13 of magnetic head erecting bed 12, the 12 outside continuities of magnetic head erecting bed with by the 12 axially extended rotating shafts 14 of magnetic head erecting bed.Position when block 13 defines 180 ° of magnetic head counter-rotatings.
The axis of rotating shaft 14 is consistent with the counter-rotating center line of magnetic head 11, and this rotating shaft 14 is by parts of bearings 15 supportings.In rotating shaft 14,,, form a large diameter taper surface 14a towards the magnetic head erecting bed with the periphery of magnetic head erecting bed 12 coupling parts.In the end of the bearing 15 relative, form a taper surface 15a who contacts with taper surface 14a face with taper surface 14a.
A gear 16 is fixed on the top of rotation axis 14, and driven wheel 16 by rights, realizes the counter-rotating of magnetic head 11.Shown in the 2nd figure (a), when 180 ° of magnetic head 11 counter-rotatings, the suitable fixed position (not drawing among the figure) of block 13 contacts, then the position of magnetic head 11 just has been determined.
When recording or playback, shown in the 2nd figure (b), magnetic head 11 is introduced from the magnetic head intake 18 of tape cassete 17, and by the tape 19 in the box 17, is pressed on the pad 20.
Pad 20 is fixed on the leaf spring of supporting at two ends 21, and the elastic reset power of this leaf spring 21 is exactly the counter-force to magnetic head 11.Rely on this power, taper surface 14a contacts with the mutual face of 15a, thereby can accurately determine the position of magnetic head 11.The magnetic head 11 in the box 17, make the size (specification is 9.8mm) of the catercorner length of magnetic head 11 here, so that can rotate less than the tape width direction of the magnetic head intake 18 of box 17.
This programme has saved the tape guidance bar that is fixed on the magnetic head next door in the existing apparatus, yet shown in the 3rd figure, what replace them is: leave magnetic head 11, in magnetic head 11 both sides, be provided with tape guidance bar 22.These tape guidance bars 22 can be fixed on the parts of bearings 15.
When recording or playback, magnetic head 11 has been subjected to the counter-force of tape 19, because this counter-force, the taper surface 14a and the 15a of rotating shaft 14 and parts of bearings 15 contact with each other.Therefore, but accurately determine the position of magnetic head 11, though saved the tape guidance pin on magnetic head next door here, but the not change of the relative position relation of magnetic head 11 and tape 19.
Owing to saved the tape guidance bar on magnetic head next door, thereby, magnetic head 11 can with the situation of contact with tape under, reverse the box 17 in.Like this, when the conversion tape running direction, magnetic head 11 and tape have been broken away from, because removed this device that makes it to break away from, make structure simplify more, manufacturing expense has also reduced.In addition, because magnetic head 11 need not move front and back when conversion, thereby also just shortened the actuation time that tape running direction is changed.
Because magnetic head 11 and tape 19 reverse contacting under the situation, when making each counter-rotating, magnetic head 11 all is that sliding friction contacts with tape 19, therefore, has purification tape and head surface, i.e. the effect of so-called erase head.Thereby can receive to prevent that acoustic characteristic from degenerating, and the excellent results that prevents magnetic head and tape deterioration.
The 4th figure and the 5th figure are two other embodiment.The example of the 4th figure is: along the periphery of rotating shaft 24, form a taper surface 24a on whole axial length, also form a big taper surface 25a who contacts with whole taper surface 24a face on parts of bearings 25, thereby improve the position precision of magnetic head 11.The example of the 5th figure is: the two ends in rotating shaft 34 form taper surface 34a and 34b respectively, on parts of bearings 35, also form and taper surface 34a and corresponding taper surface 35a of 34b and 35b respectively, thus the position precision of raising magnetic head 11.These embodiment can receive the effect same with previous embodiment.
The present invention is not limited only to above each embodiment.For example, can all form taper surface at rotatable parts and parts of bearings both sides, a square achievement is enough at least therein.
As mentioned above, at least at the rotatable parts that magnetic head is housed or support either party of parts of bearings that it freely rotates, form conical surface face, act on counter-force on the magnetic head by tape, taper surface is contacted with corresponding component, thereby can save the tape guidance bar on magnetic head next door, make magnetic head stand fast, just can in box, reverse 180 °, reach the purpose that simplified structure becomes and shorten the actuation time of tape running direction conversion.
In addition, can prevent to carry secretly between tape and magnetic head dust and dirt, during owing to the magnetic head counter-rotating, magnetic head face and magnetic surface are sliding contacts, thereby can purify magnetic surface and magnetic head face, prevent that acoustic characteristic from degenerating, and also can reach the purpose of protection tape and magnetic head.
Claims (2)
1, along with the conversion of tape running direction, 180 ° of magnetic head counter-rotatings, carry out the head support device for magnetic of the cassette tape recorder of playback or recording conversion, it is characterized in that: at least at the rotatable parts that magnetic head is housed or support either party of parts of bearings that it freely rotates, form taper surface, act on counter-force on the magnetic head by tape, taper surface is contacted with corresponding component.
2, according to the cassette tape recorder head support device for magnetic of claim 1, it is characterized in that: taper surface is set on above-mentioned rotatable parts and the parts of bearings simultaneously, acts on counter-force on the magnetic head, it can be in contact with one another by tape.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14002/88 | 1988-02-04 | ||
| JP1400288U JPH01121111U (en) | 1988-02-04 | 1988-02-04 | |
| JP63-14002 | 1988-02-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1037789A CN1037789A (en) | 1989-12-06 |
| CN1011445B true CN1011445B (en) | 1991-01-30 |
Family
ID=11849012
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102004 Expired CN1011445B (en) | 1988-02-04 | 1989-02-04 | Magnetic head supporting device of tape-recorder |
| CN89203716U Withdrawn CN2052927U (en) | 1988-02-04 | 1989-02-04 | Magnetic head support device for cassette recorder |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89203716U Withdrawn CN2052927U (en) | 1988-02-04 | 1989-02-04 | Magnetic head support device for cassette recorder |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH01121111U (en) |
| CN (2) | CN1011445B (en) |
| GB (1) | GB2215113B (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57198563A (en) * | 1981-05-29 | 1982-12-06 | Toshiba Corp | Cassette tape recorder |
| JPS62283408A (en) * | 1986-05-31 | 1987-12-09 | Tanashin Denki Co | Tape recorder |
-
1988
- 1988-02-04 JP JP1400288U patent/JPH01121111U/ja active Pending
- 1988-12-02 GB GB8828239A patent/GB2215113B/en not_active Expired - Fee Related
-
1989
- 1989-02-04 CN CN 89102004 patent/CN1011445B/en not_active Expired
- 1989-02-04 CN CN89203716U patent/CN2052927U/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB8828239D0 (en) | 1989-01-05 |
| CN1037789A (en) | 1989-12-06 |
| GB2215113A (en) | 1989-09-13 |
| GB2215113B (en) | 1991-12-11 |
| JPH01121111U (en) | 1989-08-16 |
| CN2052927U (en) | 1990-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |