JP2625792B2 - Tape recorder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder that performs recording or reproduction by winding a tape around a rotary head cylinder within a predetermined angle range.

[Summary of the Invention]

The present invention is directed to a tape recorder that draws out a tape stored in a tape cassette by a tape guide and winds the tape around a rotary head cylinder within a predetermined angle range to perform recording or reproduction, and to prevent occurrence of excessive tension of the tape during a loading operation. This is to reduce the slack of the tape in the unloading operation.

[Conventional technology]

For example, in a rotary head type video tape recorder using a tape cassette, at the time of recording or reproduction, a magnetic tape housed in the tape cassette is pulled out by a tape guide, and a predetermined angle range is inserted into a rotary head cylinder of the rotary head device. It is necessary to wrap around helically. FIG. 11 to FIG. 13 are views showing a state at the time of loading (during unloading). In these figures, the fixing head, capstan and the like are not shown for simplification of the drawing.

In the figure, (1) is a tape cassette, and (1)
S) is a supply reel, and (1T) is a take-up reel. (2) is a magnetic tape.

Further, (3) is a rotary head cylinder, and (4) is a loading ring arranged around the rotary head cylinder. A loading pull-out guide (5), a pinch roller (6), and loading guides (7) and (8) are fixed on the loading ring (4). The loading ring (4) rotates clockwise during loading and counterclockwise during unloading by rotation of a loading motor (not shown).
Further, on the outer periphery of the loading ring (4), detection sections (4a) and (4b) which are widened to detect the rotational position of the loading ring (4) are formed.

Also, (9) is a drawer arm roller on the supply side,
Illustration of the drawer arm is omitted. Further, (10) is a drawer arm on the take-up side, and (11) is a drawer arm roller attached to the tip thereof. The drawer arm (10) is mounted to be rotatable about a shaft (12). The arm rollers (9) and (11) are adapted to move in the direction of pulling out the magnetic tape (2) from the tape cassette (1) during loading by rotation of the loading motor, while moving in the opposite direction during unloading. It has been made like that.

SE1, SE2, and SE3 are sensors constituting position detecting means, respectively. The sensor SE1 has a drawer arm (1
0) for detecting the position of the sensor SE2, S
E3 is for detecting the position of the loading ring (4).

FIGS. 11, 12, and 13 show an unloading state, an FR stop state, and a loading state, respectively. The FR stop state is a stop state on a function, in which fast forward (FF) and rewind (REW) are performed.

For example, at the time of loading, from the unloading state shown in FIG. 11, the pulling arm rollers (9) and (11) are moved by the rotation of the loading motor, and the loading ring (4) is rotated.
The FR stop state shown in FIG. 12 is set, and the loading ring (4) is further rotated by the rotation of the loading motor, so that the loading state shown in FIG. 13 is obtained.
On the other hand, at the time of unloading, the loading state shown in FIG. 13 is changed from the loading state shown in FIG. 11 to the unloading state shown in FIG.

In the unloading state shown in FIG. 11, the sensor SE1 is made to face the pull-out arm (10), and the output signal S1 of the sensor SE1 becomes, for example, a high level “1” only in this unloading state. . for that reason,
An unloading state is detected from the output signal S1. In the FR stop state shown in FIG. 12,
Only the sensor SE3 faces the detection unit (4a), and the output signals S2 and S3 of the sensors SE2 and SE3 are
Only in the stop state, for example, the low level is "0" and the high level is "1", respectively. Therefore, the output signals S2 and S3
The FR stop state is detected. In the loading state shown in FIG. 13, only the sensor SE2 is made to face the detection unit (4b).
Output signals S2 and S3 are only in this loading state,
For example, they are high level “1” and low level “0”, respectively. Therefore, the loading state is detected from the output signals S2 and S3. Although not shown, these output signals S1 to
S3 is supplied as position information to a microcomputer that controls loading or unloading.

[Problems to be solved by the invention]

By the way, in such a tape recorder, for example, during loading, from the unloading state to the FR stop state, the rotation speed of the reel motor (not shown) does not match the moving speed of the drawer arm (10). However, there is a disadvantage that overtension occurs. Also,
For example, during unloading, the pull-out arm (1
The rotation of the reel motor did not match the movement of 0), and there was a problem that the tape was slackened.

The present invention has been made in consideration of such a point, and aims to prevent the occurrence of excessive tension and reduce the slack of the tape.

[Means for solving the problem]

A predetermined amount of the tape (2) is moved from an unloading position where the tape (2) is stored in the tape cassette (1) to a stop position where fast-forwarding or rewinding can be performed by an arm roller provided on the drawer arm (10). The tape is wound around the rotary head cylinder (3) in a predetermined angular range from the stop position to the loading position where the recording or reproduction operation can be performed by the tape guide provided on the loading ring (4) from the stop position, and the loading operation is performed. Returning the tape from the loading position to the stop position by the tape guide, and returning the tape to the unloading position by the pull-out arm (10);
In the tape recorder configured to perform the unloading operation by storing the tape (2) in the tape cassette, whether the tape guide is at an unloading position, a stop position, a loading position, or an unloading position. Detecting means for detecting whether or not the tape guide is located between the stop position and the rotation position of the loading ring (4), and a time period from when the tape guide performs a loading operation to when the tape guide moves from the unloading position to the stop position. Or a control means for rotating the loading motor at a constant speed by the position information signal output from the detection means to reduce the moving speed of the pull-out arm until the movement from the stop position to the unloading position when performing the unloading operation. It is provided.

[Action]

In the above configuration, for example, the rotation speed of the loading motor is reduced from the unloading state during loading to the FR stop state, or from the FR stop state during unloading to the unloading state. The rotation speed of the reel motor matches the moving speed of the drawer arm (10), thereby preventing the occurrence of overtension and reducing the slack of the tape.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of the main part of this example. That is,
3 shows a driving portion of a loading motor.

In the figure, reference numeral (21) denotes a microcomputer (hereinafter referred to as "microcomputer") for controlling loading or unloading. The microcomputer (21) includes a command signal S _CMMD for instructing loading or unloading, and a pulse P having a constant period t ₀ , for example, a period of 4 msec.
_TR and the output signals S1 to S3 of the sensors SE1 to SE3 shown in FIGS. 11 to 13 are supplied as position information.

Reference numeral (22) denotes a motor driver, and output terminals OUT1 and OUT2 of the motor driver (22) are connected to one end and the other end of the loading motor (23). The input terminals IN1 and IN2 of the motor driver (22)
Signals S ₃₈ and S ₃₉ are outputted to the output terminal E ₃₈ and E ₃₉ each microcomputer (21) is supplied as a control signal. In this case, when signals of low level “0” and high level “1” are output to the output terminals E ₃₈ and E ₃₉ , respectively, for example, 0 and + are output to the output terminals OUT1 and OUT2 of the motor driver (22), respectively.
The voltage B is output, and the loading motor (23) rotates in one direction (loading direction).
On the other hand, when signals of high level “1” and low level “0” are output to the output terminals E ₃₈ and E ₃₉ , respectively, for example, + B and 0 are output to the output terminals OUT1 and OUT2 of the motor driver (22), respectively. The voltage is output, and the loading motor (23) rotates in the other direction (unloading direction).

State of the signal outputted to the output terminal E ₃₈ and E ₃₉ of the microcomputer (21) is determined in accordance with the flowchart shown in Figure 2. That is, the flowchart of FIG.
Executed each time a _PTR is supplied. That is, the pulse P _TR
Is supplied and the subroutine THUTH,
Subroutine LNGPWM and subroutine OUTM2 are executed.

 FIG. 3 shows a subroutine THUTH.

That is, in the step, it is determined whether the mode is the loading mode _based on the command signal _SCMMD . When it is determined in this step that the loading mode is set, in the step, it is determined whether or not the loading is ended based on the output signals S1 to S3.
When the output signals S2 and S3 become, for example, a high level "1" and a low level "0", respectively, it is in the loading state (shown in FIG. 13), and thus it is determined that the loading is ended.

In step, when it is determined that the loading end, in step, type "phi _H" to the register ACC of 4 bits for operation (indicating that H suffix is hexadecimal display) (Figure 4 A), and in a step, the data in the register ACC is input to a 4-bit register M2OUT for output, and the process returns. On the other hand, if the loading end is not determined in the step, “φ8 _H ” is input to the register ACC in the step (shown in FIG. 4B), and then the process proceeds to the step.

When it is determined in step that the mode is not the loading mode, it is determined in step that the mode is the unloading mode based on the command signal _SCMMD . In this step, when judging the unloading mode,
In step S1, it is determined from the output signals S1 to S3 whether an unloading end has occurred. When the output signal S1 becomes, for example, a high level “1”, it is in the unloading state (shown in FIG. 11), and thus it is determined that the unloading is completed.

In step, when it is determined that the unloading end, at step, type "phi _H" to the register ACC (shown in Figure 4 C), the process proceeds to the after step. On the other hand, if it is not determined at the step that the unloading end has occurred, at the step, “φ4 _H ” is input to the register ACC (shown in FIG. 4D), and then the process proceeds to the step.

If it is not determined that the mode is the step unloading mode, the process returns.

Next, FIG. 5 shows a subroutine LNGPWM.

That is, at step, it is determined from the output signals S1 to S3 whether or not FR stop has occurred. That is, from the unloading state (shown in FIG. 11) to the FR stop state (shown in FIG. 12)
It is determined whether it is located between. Output signals S1, S2 and S3
Are low level “0”, high level “1” and high level “1”, respectively.
If it is, it is before the FR stop, so it is determined to be before the FR stop.

When it is determined in step that it is before the FR stop, in step 4, high level “1” is set in bit 3 of the 4-bit counter PWMCNT (bit φ to bit 3), and in step, the counter PWMCNT is set to “1”. Counts up. After that, in steps, the counter
It is determined whether or not the count value of PWMCNT is “φB _H ”.

When it is determined in step that the count value is “φB _H ”, in step, “φ8 _H ” is set in the counter PWMCNT (shown in FIG. 6A), and then the process returns. on the other hand,
When it is determined that the count value is not “φB _H ”, the process returns.

If it is determined in step that the current time is not before the FR stop, "φ _H " is set in counter PWMCNT in step (shown in FIG. 6B), and then the process returns.

FIG. 7 shows a subroutine OUTM2.

That is, at step, it is determined whether or not the bit 3 of the counter PWMCNT is at a high level "1". When it is determined in this step that the bit 3 is at the high level "1", it is determined in the step whether the bit φ of the counter PWMCNT is at the high level "1".

When it is determined in step that the bit φ of the counter PWMCNT is at the high level “1”, “φF _H ” is input to the register ACC in step (shown in FIG. 8A), and then, in step The logical product of each bit data of ACC and register M2OUT is calculated, and the result is stored in register AC.
Enter C. Then, in a step, the data of bit 2 and bit 3 of the register ACC are output to the output terminals E ₃₈ and E, respectively.
₃₉ and then returns as a signal S ₃₈ and S ₃₉ in.

When it is determined in step that the bit φ of the counter PWMCNT is not at the high level “1”,
The register ACC type ".phi.3 _H" (shown in FIG. 8 B),
Then go to step.

When it is determined in the step that the bit 3 of the counter PWMCNT is not at the high level “1”, the step
The data of the register M2OUT is input to the register ACC, and then the process proceeds to the step.

The flowchart is configured as described above. At the time of loading, from the unloading state (unloading end) to the loading state (loading end), bit 3 and bit 2 of the register M2OUT are:
As shown in FIGS. 9A and 9B, respectively, the high level is "1" and the low level is "0". Then, as shown in FIG. 9C, the count value of the counter PWMCNT is “φ” before the FR stop.
8 _H "→" .phi.9 _H "→" .phi.A _H "→" and so ø8 _H "‥‥, with changes every constant period t _0, the" phi _H "in the subsequent period. Therefore, the bits 3 and φ of the counter PWMCNT are as shown in FIGS. 9D and 9E, respectively. Then, the signal S ₃₉ and S ₃₈ are outputted to the output terminal E ₃₉ and E ₃₈ of the microcomputer (21) is shown in each FIG. 9 F and G. Therefore, during this loading, the states of the signals S ₃₈ and S ₃₉ output to the output terminals E ₃₈ and E ₃₉ are as follows:
Basically, the loading motor (23) is rotated in the loading direction since it is at a low level "0" and a high level "1", respectively. In this case, before the FR stop,
The ratio between the high level “1” and the low level “0” of the signal S ₃₉ output to the output terminal E ₃₉ is 1: 2, and the loading motor (2
Since the voltage applied to 3) is pulse-width modulated, the rotation speed of the loading motor (23) is reduced from the subsequent period.

At the time of unloading, from the loading state (loading end) to the unloading state (unloading end), the bits 3 and 2 of the register M2OUT are set to the low level “0” as shown in FIGS. "And a high level" 1 ". And the counter PW
Count of MCNT, as shown in FIG. 10 C, and before FR stop, "ø8 _H" → ".phi.9 _H" → ".phi.A _H" → "ø8 _H" →
As shown by ‥‥, it changes every fixed period t ₀ ,
In the period before that, it becomes “φ _H ”. So the counter
Bits 3 and φ of the PWMCNT are shown in FIGS.
It becomes as shown in. And the output terminal of the microcomputer (21)
Signals S ₃₉ and S ₃₈ are outputted to the E ₃₉ and E ₃₈ are as shown respectively Figure 10 F and G. Accordingly, the signals S ₃₈ and S output to the output terminals E ₃₈ and E ₃₉ during this loading are
_Since the state of ₃₉ is basically a high level “1” and a low level “0”, the loading motor (23) rotates in the unloading direction. In this case, FR
Before the stop, the ratio of the high level “1” to the low level “0” of the signal S ₃₈ output to the output terminal E ₃₈ is 1: 2, and the voltage applied to the loading motor (23) is pulse width modulated. As a result, the rotation speed of the loading motor (23) is reduced from the previous period.

As described above, according to this example, the rotation of the loading motor (23) is performed from the unloading state during loading to the FR stop state and from the FR stop state during unloading to the unloading state. Pulling arm (10) as speed is reduced
Movement of the drawer arm (1
The rotation speed of the reel motor matches the movement speed of 0), so that the occurrence of excessive tension can be prevented, and the slack of the tape can be reduced. In addition, the voltage applied to the loading motor (23) is pulse width modulated softly,
This reduces the rotation speed of the loading motor (23), is simple in control, and does not require an additional circuit, so that there is no risk of cost increase.

In the above-described embodiment, the voltage application period to the loading motor (23) is reduced to 1/3. However, this voltage application period can be arbitrarily changed by software processing. Can be adjusted optimally.

Further, according to the above embodiment, the loading motor (2
Although the voltage applied to 3) is pulse width modulated to reduce the rotation speed of the loading motor (23), the means for reducing the rotation speed of the loading motor (23) is limited to this. Instead, for example, the value of the power supply voltage may be reduced.

Further, according to the above-described embodiment, only during the period from the unloading state during loading to the FR stop state and from the FR stop state during unloading to the unloading state, the loading motor (2
3) In addition to the above, the rotation speed of the loading motor (23) is reduced near the loading state at the time of loading and unloading, for example. To reduce the tape slack.

〔The invention's effect〕

According to the present invention described above, it is determined whether the tape guide is at the unloading position, the stop position, the loading position, or whether the tape guide is located between the unloading position and the stop position. Detecting means for detecting based on the position, and until the tape guide moves from the unloading position to the stop position when performing the loading operation, or until the tape guide moves from the stop position to the unloading position when performing the unloading operation. Control means for rotating the loading motor at a constant speed according to the position information signal output from the detecting means to reduce the moving speed of the pull-out arm, thereby preventing the tape from being over-tensioned during the loading operation. , Unloading operation It is possible to reduce the slack of the definitive tape.

[Brief description of the drawings]

FIG. 1 is a structural view of a main part of the present invention, FIGS. 2 to 10 are diagrams for explaining the same, and FIGS. 11 to 13 are diagrams for explaining at the time of loading or unloading. . (1) is a tape cassette, (2) is a magnetic tape, (3)
Is a rotating head cylinder, (4) is a loading ring,
(10) is a drawer arm, (21) is a microcomputer, (22) is a motor driver, and (23) is a loading motor.

Claims (1)

(57) [Claims] 1. A predetermined amount of tape is drawn from an unloading position where a tape is stored in a tape cassette to a stop position where fast-forwarding or rewinding can be performed by an arm roller provided on a pull-out arm, and loading is performed from the stop position. The tape is wound around the rotary head cylinder by a predetermined angle range up to a loading position where a recording or reproducing operation can be performed by a tape guide provided on a ring, and the loading operation is performed by the tape guide from the loading position. Returning to the stop position, further returning the tape to the unloading position by the drawer arm, storing the tape in the tape cassette and performing an unloading operation on the tape recorder Whether the tape guide is at the unloading position or the stop position or the loading position, or whether the tape guide is positioned between the unloading position and the stop position. Detection means for detecting the position of the tape guide from the unloading position to the stop position when the tape guide performs the loading operation, or from the stop position to the unloading position when performing the unloading operation. And a control means for rotating the loading motor at a constant speed according to the position information signal output from the detection means until the movement of the pull-out arm until the movement of the pull-out arm.