JPS6025084A - Cassette tape recorder - Google Patents

Abstract

PURPOSE:To prevent occurrence of undesirable situation of dropout, etc., by installing a tape-cleaning member whose rotation is free by giving contact to a magnetic tape, and a rotation driving mechanism which rotates and drives the tape-cleaning member in the reverse direction for the travelling direction of the magnetic tape. CONSTITUTION:For a tape-cleaning member 202, when a pinch roller 116 is given contact with pressure against a capstan 114 through a magnetic tape 169 and rotated and driven in correspondence to tape travelling, e.g., in the counterclockwise direction, the rotation force is transmitted through the first idler 203 since the second idler 209 is rotated in the counterclockwise direction. As a result, the tape-cleaning member 202 is, for example, rotated and driven at high speed in the counterclockwise direction as if it avoides travelling of the magnetic tape 169, and dust attached to the magnetic tape 169, scraps from a magnetic body, etc., are removed by an edge part 204.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cassette tape recorder device, and more particularly to a cassette tape recorder device in which the magnetic chip f is cleaned to enable good recording and reproduction.

[Technical background of the invention and its problems]

As is well known, in the field of audio equipment, a digital recording and reproducing method using PCM (Pulse Code Monogram) technology has been adopted in order to achieve high fidelity recording and reproducing as much as possible. . In other words, this is what is called digital audio, and the audio characteristics are independent of the characteristics of the recording medium and are significantly superior to those using conventional analog recording and playback methods. This is because it has been established in principle.

In this type of digital audio, magnetic tapes, disks, etc. have traditionally been used as recording media for recording and reproducing digitized data obtained by fully digitally encoding information signals (analog data). There is.

Of these, magnetic tape is particularly used, and recently, the digitized data is recorded on a compact cassette tape used in an ordinary compact cassette tape recorder, for example, in a multi-track manner with a fixed head. A so-called digital cassette tail coder has been developed.

By the way, in devices that use magnetic tape as a recording medium as described above, when the magnetic tape attracts dust from the surrounding area, or when magnetic debris is generated and adheres to the tape, the magnetic head and magnetic Since there is no sufficient contact with the tape, dropouts and the like occur, resulting in a problem that good recording and reproduction cannot be performed.

This problem becomes particularly serious when recording and reproducing all r-notalized data on a magnetic tape.
In addition, this must be taken into consideration when recording and reproducing ordinary analog signals on a magnetic tape.

However, in the case of a cassette tail recorder, since the tape runs only inside the cassette case, it is difficult to effectively remove dust and other particles that adhere to the tape and thereby prevent dropouts from occurring. It was considered extremely difficult.

[Purpose of the invention]

This invention was made in consideration of the above-mentioned practice, and prevents undesirable situations such as dropouts due to magnetic material debris adhering to the width of the magnetic tape that attracts surrounding dust. It is an object of the present invention to provide an extremely good cassette tail recorder device which can effectively promote high-fidelity recording and reproduction, and is especially suitable for use in recording and reproduction of all digitized data.

[Summary of the invention]

That is, in conjunction with the operation of the tape running operation member, the present invention abuts the magnetic tape surface through a hole formed in a tape cassette in which a magnetic tape is wound, thereby causing the magnetic tape to move. A rotatable tape cleaning member for cleaning and a rotary drive that is interlocked with the operation of the tape running operation member and rotates all of the tape cleaning members in a direction opposite to the running direction of the magnetic tape. It is characterized by having a complete mechanism.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before fully describing an embodiment of the present invention, the basic structure of a digital cassette tail coder to which the present invention is applied will be briefly described below. In FIG. 1, 111 is a flat main chassis, and a pair of reel stands 112, 1
13 and a pair of cab stans 114 and 115 are rotatably supported. This main chassis 111
A pair of pinch levers 118 and 119 each having a pinch roller 16° 117 rotatably supported are rotatably supported.

Further, in the approximate center of the upper surface of the main chassis 111 in the figure, an arrow (4) in the figure
, (B) is provided with a head slider 120 that is slidable in the directions shown in FIG. Attached to the head slider 120 are a combination head section 123 formed by incorporating a multi-track type recording head 121 and playback head 122 into a single gold body, and a tape cleaning section 124, the details of which will be described later.

Here, below the main chassis 111 in the figure, a sub-chassis 125 is connected to a pair of Zide chassis 126.12.
They are arranged in parallel via 7.

And this main chassis 111 and sub chassis 12
5, a tape running drive mechanism section 128 and a head slider moving mechanism section 129 are respectively provided as shown in FIG.

Of these, the tape running drive mechanism section 12B includes a rotary blade of the tape running motor 130, a gear 132 fitted to its rotating shaft 131, and a gear 132 that is always meshed with the gear 132 and rotates around the rotating shaft 131. Support member 13 made movable
3 through a transmission gear 134 rotatably supported by the reel stand 112, 113, and selectively transmits it to the gear 135 or 136 provided coaxially with the reel stands 112, 113.
It is possible to run the entire tape.

That is, the tape running motor 130 is rotationally driven in the counterclockwise direction in FIG. It is a device that is rotated clockwise in FIG. 2 in conjunction with the operation of the rewinding operation member.

Then, the tape running motor 130 rotates at counterclockwise n1 in FIG.
When the transmission gear 134 is rotated in the direction shown in FIG. 2, the transmission gear 134 is rotated clockwise in FIG. Therefore, the transmission gear 134 is
36, the reel stand 113 is rotated counterclockwise in FIG. 2, and the magnetic tape (not shown) is run from the reel stand 112 toward the reel stand 113.

1. When the tape running motor 130 is rotated clockwise in FIG. 2, the transmission gear 134 is rotated counterclockwise in FIG. . Therefore, the transmission gear 134 is connected to the gear 135.
The reel stand 112 is rotated clockwise in FIG. 2, and the magnetic tape is transferred from the reel stand 113 to the reel stand 112.
It will become a regular practice towards. Note that when all operating members for constant tape running are operated, and when operating members for constant tape running such as the tape fast forward and rewind operating members are operated, the tape running is controlled by the action of the unillustrated Morkgapana circuit. The rotational speed of the motor 130 is changed.

Next, the Herad slider moving mechanism section 129 transmits the rotational force of the drive motor 137 to the gear 143 via the worm gear 139 fitted to the rotating shaft 138 and gears 140 to 142. Here, to the above RAD slider 12
A notch 144 having the shape shown in FIG. 2 is formed approximately at the center of the gear 1, and a protrusion 145 protruding from the gear 143 is loosely fitted into the notch 144.

The rotating portion of the drive motor 137 is moved in the direction of rotating the gear 140f clockwise in FIG. 2 in conjunction with the operation of the tape constant speed running operation member. Therefore, the gear 143 is not rotated counterclockwise in FIG. 2, but the head slider 120 is moved in the direction of arrow (4) in FIG. 2 due to the action of the protrusion 145. This is what happens.

In this way, the head slider 120 is positioned as shown by the arrow (A) in FIG.
When the leaf switch 147 is moved in the direction, the leaf switch 147 is turned on by the corner 146 formed on the right side in FIG.
As a result, the tape running motor 130 is rotationally driven in the counterclockwise direction in FIG. 2, and the tape is running.

Further, when the gear 143 is rotated counterclockwise in FIG. 2 and the leaf switch 149 is turned on by its protrusion 14B, the rotation of the drive motor 1370 is stopped and the head slider 12θ is moved as indicated by the arrow (4) in FIG. It is stopped at the position where it is moved in the direction. At this time, the combinator 1 head 621 part 12V enters into the cassette case through the head insertion hole of the cassette case 150 shown by the dashed line in FIG. Become pregnant.

When a tape running stop operation member (not shown) is operated in the tape running state at a constant speed as described above, the drive motor 137 is driven to rotate in the opposite direction, and the head slider 120 moves in the direction shown in FIG. It is moved in the direction of arrow (B). Then, the leaf switch 147 is turned off, the rotation of the tape running motor 1300 is stopped, and the tape running is stopped. When the leaf switch 152 is turned on by the other corner 15 formed on the right side of the head slider 120 in FIG. 2, the rotation of the drive motor 137 is stopped and the head slider 120 is stopped at its original position. It is something that will come to be done.

Here, the pair of pinch levers 118 and 119 include
Projections 153 and 154 are formed respectively, and these projections 153 and 154 are loosely fitted into through holes 155 and 156 formed in the head slider 120. Each pinch lever 118, 119 is connected to a coiled spring 15.
7.158, they are biased to rotate counterclockwise and clockwise in FIG. 2, respectively. Therefore, when the head slider 120 is moved in the direction of arrow (4) in FIG. 2, the pinch levers 118 and 119 are rotated in the biasing direction in conjunction with this movement, so that pinch low; 77 J 6
．． , J J 7 is inserted into the cassette case through a pair of pinch roller insertion holes formed in the cheat cassette 150, and inserted into the capstan 11 through the magnetic chip.
4.115. It's a trench.
When the head slider 120 is returned in the direction of arrow CB in FIG.
4 is pressed, the pinch levers 118 and 119 are rotated in the opposite direction, and the pinch rollers 116 and 117 are separated from the capstans 114 and 115.

Note that flywheels 159 and 150 are coaxially provided on the capstans 114 and 115, respectively. Of these, the flywheel 160 is rotated in the counterclockwise direction in FIG. 2 by the rotational force of a motor (not shown) that is rotationally driven in conjunction with the operation of the operating member for constant speed running. Further, the flywheel 159 is connected to the flywheel 160 through a belt 161f (via which rotational force can be transmitted).
At the same time, it is rotated counterclockwise in FIG.

Here, the pinch lever 118 includes an erase head 16.
2 is attached. When the pinch lever 118 is rotated counterclockwise in FIG.
Insert into the cassette case from the pinch roller insertion hole of the tape cassette 150 along with the pinch roller 116.
It comes into contact with the magnetic tape. Further, the erasing head 162 is configured to perform an erasing function by being supplied with an erasing bias signal in conjunction with the operation of the recording operation member.

Here, the cheat cleaning section 124 includes the combination head section 123 and the pinch row 2.
116, the head slider 120
attached to the top. In other words, the cheat cleaning section 124Id is located on the upstream side of the tape section 123 when the tape is running at a constant speed.

FIG. 3 La), tb) and FIG. 4 show the detailed structure of the cheat cleaning section 124. That is, this tape cleaning section 124
3 and 164, and a tape cleaning member 167 that is fitted into a four part 166 formed at one end of the mounting member 165. Among these, the tape cleaning member 167 is made of a hard material such as sapphire, ruby, ceramics, or cemented carbide, and is formed into a substantially rectangular parallelepiped shape. A portion 168 is formed. The cheat cleaning section 124 cleans the head slider 12.
0 is moved in the direction of arrow (4) in FIG.
The erase head is inserted into the cassette case through the erase head insertion hole formed at 0, and the edge portion 168 is pressed against the magnetic tape 169 as shown in FIGS. 3 and 4.

Here, FIG. 5 shows the combination head section 123 and the pinch roller 11 when the tape is running at a constant speed as described above.
6, 117 shows the positions of the erasing head 162 and cheat cleaning section 124 with respect to the tape cassette 150. That is, the combination head section 123 is inserted into the head insertion hole 17 of the tape cassette I50.
0 through the recording head 121 and playback head 1.
22 is in contact with the magnetic tape 169. The pinch rollers 116 and 117 are inserted through the pair of pinch roller insertion holes 171 and 172'z of the cheats cassette 150, respectively, and connected to the capstan 11 through the magnetic tape 169.
It is pressed at 4°115. Then, the erasing head 16
2 is fully inserted through the pinch roller insertion hole 171 and is in contact with the magnetic tube 169.

σ et al., the tape cleaning unit 124 pushes through one hole 17.9 of the pair of erase head insertion holes 173 and 174 of the tape cassette 15o, so that the edge portion 16B of the tape cleaning member 167 contacts the magnetic jaw 69. being contacted.

It should be noted that FIG. 6 shows the constant speed running state of the chip shown in FIG. 5 as viewed from the top side of the head slider 12o.
It is designed to indicate the position of number 9.

The reel stand 113 is rotated in the counterclockwise direction in FIG. 2, and the capstans 114 and 115 are both rotated in the counterclockwise direction in FIG. The vehicle is driven at a constant speed in the direction (C).

At this time, the magnetic tape 169 is removed by the edge portion 16B of the tape cleaning member 167 and reaches the combination head portion 123 after removing unnecessary adhesion noise such as dust and magnetic debris.

Therefore, the magnetic tape 169 and the recording head 12 and the playback head 122 of the combination head section 123 are in sufficient contact with each other, and dropouts and the like do not occur.
It is possible to perform good recording and reproduction.

Therefore, when running the tape at constant speed as described above,
Since the tape cleaning section 124f is provided on the upstream side of the tape traveling with respect to the conjunction head section 123, recording and reproduction can be performed after removing dust, magnetic debris, etc. attached to the magnetic tape 169. Therefore, it is possible to perform good recording and reproducing without causing dropouts and the like, and it is possible to effectively promote high-fidelity recording and reproducing.

In this regard, FIG. 7 shows the results of experimentally measuring the incidence of dross 7 out during playback with and without tape cleaning. That is, in FIG. 7, the horizontal axis is the playback time T, and the vertical axis is 1.
The rate R is the length of a 1-stroke that occurs per second.
The characteristics indicated by X in the figure are 9 when tape cleaning is performed, and the characteristics indicated by O in the figure are clean water when take 0 cleaning is not performed.

Therefore, as is clear from FIG. 7, it can be seen that the incidence of droplets is clearly lower when tape cleaning is performed.

'Furthermore, as shown in FIG. 5, the chi 70 cleaning section 124 is located on the downstream side of the pinch roller 116 in the tape running direction. For this reason, pinch roller 1
16 and the capstan 114 may be attached to the magnetic tube 169, no problem will occur. Further, the tape cleaning member 167 and the mounting member 165 may be integrally formed of the same material, and in this case, it is advantageous in terms of manufacturing and economy if ceramic or the like is used as the material.

Furthermore, in the above description, the two cab stans 114,
I have described the so-called dual-cano-stan type Denotal power set tape recorder equipped with 115, but this can of course also be a single-cano stan type Denotal power set Teso recorder, as well as a digital case with an auto-reverse function, May be used for totezo recorders. In this case, the cheat cleaning section 124 is always connected to the switching mechanism of the combination head section 123, etc.
It is sufficient if it is located on the upstream side of the tape running with respect to 23.

Next, one embodiment of the present invention will be described in detail with reference to the drawings based on the r-nockle cassette tail coder having the basic configuration described above.

That is, in FIG. 8, 123 is a recording head <21 mounted on the Herad slider 120 (see FIG. 2).
This is a combination head section in which a reproduction head 122 and a reproducing head 122 are integrally incorporated. The main chassis 1 is located near both ends of the combination head section 123.
11 (see FIG. 2) A pair of pinch levers 118 and 119 are rotatably supported with respect to the pin 11 (see FIG. 2). A tape cleaning mechanism section 200 is installed.

Here, as shown in FIG. 9, in this cheat cleaning mechanism section 200, a substantially rectangular mounting section 201 is fixed to the above-mentioned helad chassis 120, and a substantially cylindrical tape cleaning member is attached to the tip of this mounting section 201. 202 and a first idler 203 which is pressed against the cleaning member 202 so as to rotate together with the cleaning member 202 are rotatably provided.

Here, the tape cleaning member 202 is, for example, the erasing head insertion hole 17 of the tape cassette 150.
3 and magnetic tape 169 width,
For example, sapphire.

It is made of hard materials such as ruby, upper 2 mix, and cemented carbide. This tape cleaning member 202
Acute edge portions 204 for removing dust and magnetic debris from the magnetic tape 169 are formed at predetermined intervals on the outer periphery of the magnetic chip 1169, corresponding to the surface of the magnetic chip 1169.

Here, the rotational center of the first idler 203 is rotatably supported on a shaft 205 implanted in the herad chassis 120. An intermediate portion of a first lever 206 is rotatably supported on this shaft 205.

One end of a second lever 207 is rotatably supported at one end of the first lever 206 via a shaft 208f, and a second idler 209 is supported at the other end of the second lever 207. is rotatably supported so as to be in pressure contact with the first idler 203 and the pinch roller 116 of the bi/tiltper 118, respectively, so as to rotate together.

Further, the first lever 206 has a spring engaging portion 30θ formed at its other end, and one end of the spring member soi is engaged with this spring engaging portion 300. The other end of the spring member 301 is engaged with the engagement portion 302 of the spare chassis 120 so as to bias the IT lever 206f clockwise in the drawing.

That is, the cheat cleaning mechanism section 200 configured as described above is configured as described above for constant speed tape running.
When the actuating member is operated, the head slider 12θ is moved in the four directions of the arrows, so that the tape cleaning member 202 is moved in the same direction together with the mounting portion 201, and the tape cleaning member 202 is moved through the erasing head insertion hole 173 of the cheats cassette 150. It enters into the cassette case and comes into pressure contact with the magnetic tape 169.

At this time, the head slider 120 rotates the pinch levers 118 and 119 counterclockwise and clockwise in the figure, respectively, as described above, so the pinch roller 11
6, 117 enters the cassette case through the pinch roller insertion holes 171 and 112f of the cheats cassette 150 and presses the magnetic tips 169 against the capstans 114 and 115.
Pressure-welded through.

Here, since the first lever 206 of the tape cleaning mechanism section 200 is biased clockwise in the figure by the spring member 301, the pinch lever 118 on the left side in the figure is rotated counterclockwise in the figure. In conjunction with this movement, the first lever 206 is urged to rotate clockwise in the figure.

As a result, the first lever 206 becomes the pinch lever 1.
18, the second idler 209 is rotated clockwise in the entire diagram via the second lever 207 and brought into pressure contact with the pinch row 2116 and the first idler 203 so as to be able to transmit rotational force. It is.

Here, in the tape cleaning member 202, as described above, the pinch roller 116 is pressed against the cag stan 114 via the magnetic tape 169, and the tape cleaning member 202 is driven to rotate, for example, clockwise in the figure, in response to the running of the tape. Since the second eye 2209 is rotated counterclockwise in the figure, its rotational force is transmitted via the first idler 209f. As a result, the cheat cleaning member 202 is rotated counterclockwise in the drawing at a high speed, for example, so as to block the running direction of the magnetic tape 169, and is attached to the magnetic tape 169 by its esso portion 204. The removed dust and magnetic debris are removed.

In this manner, the tape cleaning mechanism section 200 operates the rotatable tape cleaning member 202 in conjunction with the tape constant speed running operation member to valve the erasing head insertion hole 173 - 11 of the tape cassette 150 and clean the magnetic tape 169 .
Press it against the tape and run against the tape running direction? i"r: The configuration is such that the rotation is driven in the opposite direction so as to prevent it. This is because the relative speed between the cheat cleaning member 202 and the magnetic tape 169 is increased to improve its removal performance and durability as much as possible. This makes it possible to improve the

In addition, the present invention is not limited to simply configuring the tape cleaning mechanism section 200 to be attached to the head chassis 120 as described in the above embodiments, but also includes various operating members that take two positions depending on the tape running and running stopped states. It is equally effective to configure the attachment so that it is linked to the

In each of the embodiments described above, the present invention uses the rotational driving force from the pinch roller 17 or the cab stan 114 on the right side of the figure without using the rotational force from the pinch roller 116.
．． 115 or a dedicated drive source is equally effective. Therefore, it goes without saying that according to the present invention, various modifications can be made without departing from the gist of the invention.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, it is possible to prevent undesirable situations such as dross-out caused by the magnetic tape attracting surrounding dust or adhering to magnetic debris. Therefore, it is possible to provide an extremely good cassette tape recorder device which can effectively promote high-fidelity recording and reproduction and is especially suitable for use in recording and reproduction of digitized data.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the basic configuration of a digital cassette tail recorder to which the present invention is applied; FIG. 2 is a plan view showing a tape running drive mechanism and a head slider moving mechanism of the digital cassette tail recorder; Figures 3 and 4
Figures 5 and 6 are block diagrams showing details of the tape cleaning section of the same digital cassette and tape recorder, respectively.
The figures are a plan view and a perspective view, respectively, showing the tape constant speed running state of the digital cassette tape recorder, and Figure 7 shows the characteristics for comparing the dropout occurrence rate between cases where tape cleaning is performed and cases where tape cleaning is not performed. 8 is a plan view showing a cassette tape recorder device according to an embodiment of the present invention, and FIG. 9 is a perspective view showing the main part of FIG. 8. 111... Main chassis, 112, 113... Reel stand, 114.115... Cab stan, 116,
Il'l...Pinch roller, 118, 119...
Pinch lever, 120...Head slider, 121.
...Recording head, 122...Playback head, 123...
・Combination head section, 124... Tape cleaning section, 125... Sub chassis, 126.12
DESCRIPTION OF SYMBOLS 1... Side chassis, 128... Tape travel drive mechanism part, 129... Head slider movement mechanism part, 130...
・Tape running motor, 131...rotating shaft, 132・
...Gear, 133... Support member, 134... Transmission gear, 135, 136... Gear, 137... Drive motor, 138... Rotating shaft, 139... Worm gear,
140 to 143... Gear, 144... Notch, 1
45...Protrusion, 146...Corner, 147...Leaf switch, 148...Protrusion, 149...) Leaf switch, 150...Chive cassette, 151...
Corner, 152...Leaf switch, 153°154.
...Protrusion, 155,156...Through hole, 157°158
... Spring, 159.160 ... Flywheel, 161 ... Belt, 162 ... Erasing head, 16
3.164...Screw, 165...Mounting member, 166...
・Concavity, 167 ・Tape cleaning member, 168 ・
...Edge part, 169...Magnetic tape, 170...
Head insertion hole, 171.172... Pinch roller insertion hole, 173, 174... Erasing head insertion hole, 200.
...Tape cleaning mechanism section, 20...Mounting section, 2
02... Tape cleaning member, 203... First
idler, 204...edge part, 2θ5...axis,
206...First lever, 207...Second lever, 208...Shaft, 209...Second a.
00... Spring engaging part, 301... Spring member, 3o2.
・Attachment part. Applicant's agent Patent attorney Takehiko Suzue Figure 3 124 Figure 4

Claims (1)

[Claims] A through-hole plate formed in a tape cassette in which a magnetic tape is wound is rotatable in conjunction with the operation of a tape running operating member to contact the magnetic tape surface and clean the magnetic tape. and a rotational drive mechanism that is interlocked with the operation of the tape running operation member and rotates the tape cleaning member in a direction opposite to the running direction of the magnetic tape. A cassette tail recorder device characterized by: