JPH03178019A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable head cleaning under the loading state of a tape cassette by providing a cleaning tape drawing part for drawing out the cleaning tape to a position capable of making contact with a rotary head drum and a cleaning tape traveling part. CONSTITUTION:The cleaning tape 6 is drawn out from the inside of a cleaning tape cassette C2 to come into contact with the rotary head drum 3 (rotary head 2) by driving the cleaning tape drawing part. When the cleaning tape 6 is traveled by driving the cleaning tape traveling part, the rotary head 2 rotating with the rotary head drum 3 is rubbed by the cleaning tape 6, so that dirt sticking to the rotary head 2 is removed. By this method, the head cleaning can be performed under the loading state of the recording and reproducing tape cassette C1.

Description

Detailed Description of the Invention <Field of Industrial Application> The present invention relates to a rotary head type magnetic recording/reproducing device such as a DAT (digital audio recorder) or a VTR (video tape recorder), and particularly relates to a rotary head type magnetic recording/reproducing device such as a DAT (digital audio recorder) or a VTR (video tape recorder). This invention relates to head cleaning technology for removing dirt from the head.

<Prior Art> Conventionally, when removing dirt from a rotary head in a rotary hand type magnetic recording/reproducing device, the tape cassette loaded in the recording/reproducing tape cassette loading section is removed,
Instead, the rotating head is cleaned by loading a cleaning tape cassette of the same shape as the tape cassette, turning the drum into playback mode, and running the cleaning tape in contact with the rotating head while rotating the drum. .

<Problems to be Solved by the Invention> However, for head cleaning, it is necessary to: ■ take out the loaded recording/playback tape cassette, ■ load the cleaning tape cassette, and ■ reload the recording/playback tape cassette after cleaning. There is a problem that the operation is troublesome and time-consuming as it requires 3ii4 steps of loading, and as a matter of course, head cleaning cannot be performed while loading a recording/playback tape cassette. There were restrictions.

The present invention was devised in view of these circumstances, and it is possible to perform head cleaning even when the tape cassette for recording and playback is loaded without having to take it out. The purpose is to

<Means for Solving the Problems> In order to achieve the above object, the present invention adopts the following tank bottom.

That is, the rotary head type magnetic recording and reproducing device of the present invention has the following features:
A cleaning tape cassette is replaceably provided at a location facing the rotating head drum at a location different from the recording/playback tape cassette loading section, and the cleaning tape in this cleaning tape cassette is moved to a position where it contacts the rotating head drum. The apparatus includes a cleaning tape feeding part that feeds out a cleaning tape, and a cleaning tape running part that makes the cleaning tape run.

<Operation> The operation according to the above-mentioned precept (1) of the present invention is as follows.

By driving the cleaning tape feeding section, the cleaning tape is fed out from inside the cleaning tape cassette and brought into contact with the rotating drum (rotating head). When the cleaning tape in contact with the rotary head drum is run, the rotary head rotating together with the rotary head drum is rubbed by the cleaning tape, and dirt adhering to the rotary head is removed.

Since the cleaning tape cassette is provided at a location different from the tape cassette loading section, this cleaning tape cassette does not interfere with the loading of the recording/playback tape cassette. There is no need to remove the cassette from the tape force cent loading section.

Note that when the cleaning tape becomes dirty, the cleaning tape cassette can be replaced with a new one.

<Example> Hereinafter, an example in which the present invention is applied to a DAT will be described in detail based on the drawings.

Figure 1 is a schematic plan view showing the main parts of the structure for head cleaning; (a) shows the state without head cleaning, and (b) shows the state with head cleaning. Indicates each state.

As shown in FIG. 1, a rotary head drum 3 equipped with a pair of rotary heads 2 is arranged at the back of a loading section (tray) 1 for recording and reproducing tape cassettes CI. A cleaning table cassette C2 is provided at a location facing the drum 3.

The cleaning tape cassette C2 has a take-up rule 4,
A supply reel 5, a cleaning tape 6 fixed at both ends to these reels 4.5 and wound around the supply reel 5, and a pair of tape guides 7 for guiding the cleaning tape 6.
8, a case 9 for storing both reels 4.5, a cleaning tape 6, and a tape guide 7.8.

This cleaning tape cassette C2 is a tape cassette for recording and playback that is frequently loaded and unloaded. When the tape 6 becomes dirty beyond a certain level, or periodically, it is removed from the DAT device main body and replaced with a new cleaning tape cassette C2.

The main body of the apparatus includes a loading post 10 that enters the back side of the cleaning tape 6 inside the tape guide 7 when the cleaning tape cassette C2 is attached, a solenoid 11 for driving the loading post 10 in and out, and a cleaning tape cassette. A cleaning motor 12 is provided, the rotating shaft of which is connected to the winding wheel 4 when C2 is attached.

In FIG. 1, reference numeral 13 denotes a recording/reproducing tape pulled out from the recording/reproducing tape cassette CI and loaded onto the rotary head drum 3, and 14.15 is a loading post for loading the recording/reproducing tape 13. be.

In the case of DAT, unlike VTR, rotating head drum 3
Since the diameter of the recording/reproducing tape 13 is small and the winding angle of the recording/reproducing tape 13 around the rotating head drum 3 is 90'', when the recording/reproducing tape cassette Ct is loaded into the loading section l, the loading boss) 14.15 automatically pulls out the recording/reproducing tape 13 and brings it into contact with the rotating head drum 3.

FIG. 2 is a block circuit diagram showing the cleaning control circuit.

A solenoid drive circuit 17 for driving the solenoid 11, a cleaning motor drive circuit 18 for driving the cleaning motor 12, and a rotating head drum 3 are connected to the DC' @ source 1B via the resistor R1 and the cleaning switch 16. The head drum motor 19 (first
A hent drum motor drive circuit 20 for driving a drum (not shown in the figure) is connected thereto.

The loading post IO, the solenoid 11, and the solenoid drive circuit 17 constitute a cleaning tape feeding section 21 according to the configuration of the invention, and the cleaning motor 12 and the cleaning motor drive circuit 18 constitute a cleaning tape running section 22 according to the configuration of the invention. It consists of

Next, the operation of this first embodiment will be explained.

In FIG. 1(a), a recording/reproducing tape 13 is loaded onto a rotary head drum 3 by a loading post 14.15, and a head drum motor drive circuit 20 is installed in a control system different from the control circuit shown in FIG. In this state, the head drum motor 19 is rotated and the pair of rotary heads 2 are performing recording or reproduction on the recording/reproducing tape 13. In this state, head cleaning is not performed.

Since the cleaning tape cassette C2 is provided at a location different from the loading section l of the recording and reproducing tape cassette C1, even if the cleaning tape cassette C2 is permanently installed, the recording and reproducing tape cassette CI cannot be loaded and recorded/reproduced. There are no problems with operation.

After stopping recording/playback from the state shown in FIG. 1(a), when the cleaning switch 16 is pressed, the solenoid drive circuit 1
7. The cleaning motor drive circuit 18 and the head drum motor drive circuit 20 are connected to the DC type source +B and each becomes active. As a result, the solenoid 11 is driven, and the loading post 10 moves to protrude as shown in FIG. Further, the cleaning motor 12 is driven to rotate the take-up reel 4 at a low speed, causing the cleaning chevron 6 in contact with the rotary head drum 3 to run, and the head drum motor 19 is driven to rotate the rotary head drum 3 at a high speed. Rotate.

To rotation 7 By the rotation of drum 3 to a pair of rotations 2
contacts the cleaning chip 16 periodically, and the dirt adhering to the rotary head 2 is scraped off by the cleaning chip 16. This head cleaning can be performed while the recording/reproducing tape 13 is still loaded in the loading section l.

When the cleaning switch 16 is turned off, the solenoid drive circuit 17. The cleaning motor drive circuit 18 and the head drum motor drive circuit 20 are stopped, the loading post 10 is retracted, and the cleaning tape 6 is stored in the cleaning tape cassette C2.
The cleaning motor 12 is stopped, the feeding of the cleaning team 16 is stopped, and the rotating head drum 3 is also stopped.

In addition, when applied to a VTR, when recording/playback is stopped from the state shown in FIG. 1(a), the loading post 14
．． 15 is retracted, the recording/reproducing tape 13 is separated from the rotary head drum 3, and the cleaning switch 16 is turned on in this state.

In the second embodiment, head cleaning is automatically performed every time a recording/reproducing tape force center CI is loaded into the loading section l.

FIG. 3 is a block circuit diagram showing the cleaning control circuit.

The loading detection switch 31, which is closed in conjunction with the loading operation of the recording tape cassette C1 for playback into the loading section 1, has one end connected to the DC power supply 1B via a pull-up resistor R2, and the other end connected to the The input terminal of an active low control circuit 32 is connected to the DC power source 10B via a pull-up resistor R2.The output terminal of this control circuit 32 is connected to the first Solenoid drive circuit 17 similar to the embodiment; cleaning motor drive circuit 18 and head drum motor drive circuit 20
is connected.

When the input terminal of the control circuit 32 becomes "L" level, the control circuit 32 sends a "H" level cleaning command signal to the solenoid drive circuit 17 for a certain period of time T (several seconds).
．． It is configured to output to the cleaning motor drive circuit 18 and the head drum motor drive circuit 20.

The rest of the configuration is the same as that of the first embodiment, so a description thereof will be omitted.

Next, the operation of this second embodiment will be explained using the time chart of FIG. In addition, in this operation description, reference is made to FIG. 1(b).

When the recording/reproducing tape cartridge C1 is not loaded in the loading section l, the loading detection switch 31 is OFF, the @[('' level is applied to the input terminal of the control circuit 32, and the control circuit 32 is driven by a solenoid. Circuit 17. Since the "L" level is output to the cleaning motor drive circuit 18 and head drum motor drive circuit 20, each of these drive circuits 17, 18, and 20 is not driven, and therefore head cleaning is not performed.

When the recording/reproducing tape cassette C■ is loaded into the loading section 1, the loading post 14.15 moves and pulls out the recording/reproducing tape 13 from the cassette CI, winding it around the rotating head drum 3, and also attaches the recording/reproducing tape cassette to the rotating head drum 3. As the cent C1 is loaded, the loading detection switch 31 is turned on, and the input terminal of the control circuit 32 is grounded and becomes "L" level.
is the solenoid drive circuit 17. The "H" level is output to the cleaning motor drive circuit &318 and the head drum motor drive circuit 20 for a certain period of time T0.

As a result, similar to FIG. 1(b) in the case of the first embodiment,
The solenoid 11 is driven to bring the cleaning tape 6 into contact with the rotating head drum 3 via the loading post 10, and the cleaning motor 12 is driven to bring the take-up reel 4 into contact with the cleaning tape 6.
The cleaning team 16 travels at a low speed through the head drum motor 19, and the rotary head drum 3 is rotated at a high speed, so that the cleaning of the drum 2 is performed by a pair of rotating wheels that periodically contact the cleaning team 16.

After a certain period of time T0 has elapsed, the loading detection switch 31 is turned to O.
Although it remains in the N state, the output from the control circuit 32 is inverted to "L" level, and each drive circuit 17, 18.2
0 is stopped and head cleaning is completed. That is, similarly to the first embodiment, the cleaning tape 6 is stored in the cleaning tape cassette C2 by retracting the loading post IO, the cleaning tape 6 is stopped being fed by stopping the cleaning motor 12, and the rotating head drum 3 is stopped. will be carried out.

Note that limiting head cleaning to a certain period of time T0 is
This is to avoid wear of the rotating head 2.

In the case of this second embodiment as well, head cleaning can be performed with the recording/reproducing tape cassette C1 loaded in the loading section 1, and since head cleaning is automatically performed as the recording/reproducing tape cassette C1 is loaded, the rotating head 2 is constantly It can be kept in a clean state and does not bother the user.

The control circuit 32 operates for a fixed period of time T, in conjunction with the ON operation of the power switch, or in conjunction with the command operation of the recording operation, reproduction operation, fast forward operation, or rewind operation of the recording/reproduction tape 13. "C" may also be used. Since a certain amount of time is required from the point of command operation for each of these operations until the recording/reproducing tape 13 actually starts running, the head cleaning may be performed during this time. If this is done, the cleaning tape 6 will not come into contact with the rotating head drum 3 while the recording/reproducing tape 13 is running.

The third embodiment is particularly related to DAT, and is configured to automatically perform head cleaning when the count of error detection signals for PCM signals during reproduction exceeds a certain level. This is what I did.

FIG. 5 is a block circuit diagram showing the cleaning control circuit.

A signal processing circuit 42 is connected to each rotating head 2 via an amplifier 41.
An active low control circuit 43 is connected to the next stage of the signal processing circuit 42. The signal processing circuit 42 performs various signal processing, but for the control circuit 43, the count number of error detection signals is set to a reference value N.
It is configured to output a cleaning command signal of "L" level when the cleaning command signal reaches "L" level.

The output terminal of the control circuit 43 is connected to a solenoid drive circuit 1?317 and a cleaning motor drive circuit 18 similar to those in the first embodiment. Control circuit 4
3 is configured to output a drive signal (“I” level) to the solenoid drive circuit 17 and the cleaning motor drive circuit 18 when its input terminal reaches the °L° level.

In this embodiment, the head drum morph drive circuit 20 is not connected to the recording/reproducing tape 13.
This is because head cleaning is performed during playback, that is, while the head drum motor 19 is rotating.

The rest of the configuration is the same as that of the first embodiment, so a description thereof will be omitted.

Next, the operation of this third embodiment will be explained using the time chart shown in FIG. In addition, in this operation description, reference is made to FIG. 1(b).

During playback of the recording/playback tape 13, the PC is sent to the signal processing circuit 42 alternately from the RAD 2 to each rotation via each amplifier 41.
The M signal is input, and error detection is performed in the signal processing circuit 42. Error detection signals are counted and stored in RAM. The count number of error detection signals is the standard (,HN
th, in the following cases, #H level is output from the No. 13 processing circuit 42 to the input terminal of the control circuit 43, so the control circuit 43 outputs "L" level to the solenoid drive circuit 17 and cleaning motor drive circuit 18. These drive circuits 17 and 18 are not driven, so head cleaning is not performed.

When the count number of the error detection signal reaches the reference value NLh, the signal processing circuit PI42 outputs a cleaning command signal of "L" level to the control circuit 43, and based on this, the control circuit 43 activates the solenoid drive circuit. 17 and the cleaning motor drive circuit 18.
Outputs H° level.

As a result, similar to FIG. 1(b) in the case of the first embodiment,
The solenoid 11 is driven and the cleaning tape 6 is brought into contact with the rotating head drum 3 via the loading post IO, the cleaning motor 12 is driven and the cleaning tape 6 runs at low speed via the take-up reel 4.
A pair of rotating heads 2 periodically contact the cleaning chip 16 to perform cleaning.

As a result of this head cleaning, the count number of the error detection signal is set to a reference value Nt lower than the reference value Nth+.
When it returns to hx, the output of the signal processing circuit 42 is inverted to "H" level, the output of the control circuit 43 is inverted to "L" level, each drive circuit 17, 18 is stopped, and the head cleaning process is completed. That is, The loading post 10 is retracted and the cleaning tape 6 is stored in the cleaning tape cassette C2, and the cleaning motor 12 is stopped to stop feeding the cleaning tape 6.

In the case of this third embodiment, the recording/reproducing tape case)C
Head cleaning can be performed while I is playing, and the head cleaning is automatically performed when the count of error detection signals exceeds a certain level, so there is no need to bother the user. By setting the count number (reference value Nth+) of the error detection signal when the circuit 42 outputs the "L" level to a time when the degree of dirt on the rotating head 2 is quite low, the rotating throat 2 can be kept clean at all times. can be kept in good condition.

<Effect of the invention> According to the present invention, the following effects are achieved.

The cleaning tape case, which contains a cleaning tape that removes dirt from the rotating gutter by sliding contact with the rotating gutter, is installed in a separate location from the recording/playback tape cassette loading section. The cleaning tape running part does not interfere with the loading of the recording/playback tape cassette, and head cleaning can be performed with the recording/playback tape cassette still loaded, improving the workability of head cleaning. At the same time, it is possible to shorten the working time.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 relate to a first embodiment of the present invention.
The figure is a schematic plan view showing the main part of the structure for head cleaning in a rotating head type magnetic recording/reproducing device.
In the figure, (a) shows a state in which head cleaning is not performed, and (b) shows a state in which head cleaning is performed. FIG. 2 is a block circuit diagram showing a cleaning control circuit. 3 and 4 relate to the second embodiment, FIG. 3 is a block circuit diagram showing a cleaning control circuit, and FIG. 4 is a time chart for explaining the operation. 5 and 6 relate to the third embodiment, FIG. 5 is a block circuit diagram showing a cleaning control circuit, and FIG. 6 is a time chart for explaining the operation. l... Loading section, 2... Rotating head, 3... Rotating throat drum, 4... Take-up reel, 5... Supply reel, 6... Cleaning tape, 10... Loading post , II... Solenoid, 12... Cleaning motor, 13... Recording and reproducing tape, 14.15
Loading post, 16 Cleaning switch, 17 Solenoid drive circuit, 18 Cleaning morph drive circuit, 19 Head drum motor, 20 Head drum motor drive circuit, 21.
...Cleaning tape feeding section, 22...Cleaning tape running section, 31...Loading detection switch, 32
...Control circuit, 42...(ε processing circuit,
43... Control circuit, CI... Recording/playback tape cassette/C2... Cleaning tape cassette

Claims (1)

[Claims] (1) A cleaning tape cassette that is replaceably provided at a location facing the rotating head drum at a location different from the recording/playback tape cassette loading section, and the cleaning tape in this cleaning tape cassette is brought into contact with the rotating head drum. A rotary head type magnetic recording/reproducing device comprising: a cleaning tape feeding section that feeds out a cleaning tape to a position where the cleaning tape is fed; and a cleaning tape running section that causes the cleaning tape to run.