JP2870809B2 - Tape transfer device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape transport device suitable for use as a fast-forward or rewind mechanism of, for example, a tape cassette type audio tape recorder or video tape recorder.

[Summary of the Invention]

In a tape transfer device for transferring a tape from one reel to another, a detecting means for detecting the rotation speed of each of the one reel and the other reel, and a discrimination for discriminating a length of the tape and a type of the other reel. Means, when the length of the tape and the type of the other reel can be determined by this determination means, the tape is transferred at a high speed while calculating the remaining amount of the tape from the rotation speed of each reel and the length of the tape, When the remaining amount becomes equal to or less than a predetermined value, the tape is decelerated, and when the discriminating means cannot discriminate the length of the tape and the type of the other reel, the tape is decelerated at a predetermined speed lower than the transfer speed during high-speed transfer. Control means for transferring the tape, and when the discriminating means can determine the length of the tape and the type of the other reel, the tape is transferred at a higher speed. If the discriminating means cannot discriminate the length of the tape and the type of the other reel, the tape can be transferred at a predetermined speed lower than the transfer speed during the high-speed transfer, for example, By making it possible to transfer a tape at a predetermined speed lower than the transfer speed at the time of the high-speed transfer, to a tape and a reel of a type which cannot be determined by the determination means which may appear in the future. It is made to be able to cope.

[Conventional technology]

For example, in a tape cassette type audio tape recorder, digital audio tape recorder (DAT), video tape recorder (VTR), etc., fast-forward and rewind times are unnecessary wait times for the viewer, and fast-forward and rewind times are unnecessary. The shorter the time, the better.

In the conventional fast-forward control of, for example, a VTR, a constant value V ₁ is gradually increased from a tape start point (tape position x = 0).
A driving voltage to reach a supply to the drive motor, it had no As in the middle portion of the tape as indicated by the curves in FIG. 8 (1) for driving the drive motor at a rotational speed ω about _1. In this case, the tape speed is a value determined from the diameter of the tape wound on the rotational speed omega ₁ and a take-up reel.

Further, a transparent leader tape and a trailer tape are connected to the video tape, for example, at a tape top portion and a tape end portion (x ₁ ≦ x ≦ x ₀ ), and the tape top and the tape end are detected by a photoelectric sensor. It has been made possible. Therefore, the driving voltage is supplied to the drive motor when the tape end is detected at the tape position x ₁ and sets to 0, by actuating the brake mechanism, as shown in FIG. 8, the tape of the end point (x = X ₀ ), the running speed of the tape can be stopped by setting the rotation speed ω of the driving motor to 0.

In this case, generally for the maximum rotation speed of the driving motor have a significant margin than its omega _1, the rotation speed of 2 times the omega ₁ as indicated by the drive motor curve of Figure 8 (2) omega It is also conceivable to drive by _two .

[Problems to be solved by the invention]

However, when the tape end is detected by the tape position x ₁ when driving the driving motor at its rotation speed omega _2, the driving voltage is set to 0 for the drive even by actuating the brake mechanism Motor rotation is the end point of the tape
not become zero even x _0, there is a disadvantage that the tape is damaged by impact force is applied to the tape end.

For this reason, in the case of a system in which the driving motor is simply driven at a constant voltage or a constant rotation speed as in the conventional example, it is possible to transfer the tape at a higher speed in the middle of the tape in terms of hardware. However, the ability to prevent damage to the tape top and tape end could not be fully utilized.

Further, as a method improved from the conventional example, a method is provided in which a rotation measuring sensor is provided on the rotating shaft on the supply reel side, and when the rotation speed on the supply reel side reaches a certain value, the drive voltage of the drive motor is reduced. Has also been proposed. However, in this system, the tape may not be decelerated due to the difference in the hub diameter of the tape cassette or the fluctuation of the mechanical load, so the tape feed speed is set to a low value with a margin much larger than the limit speed of the hardware. I had to.

In view of the above, the present invention provides a tape transfer device for transferring a tape from one reel to another reel, wherein the length of the tape and the other reel are determined by a determination unit that determines the length of the tape and the type of the other reel. When the type of the tape can be determined, the tape is transported at a high speed while calculating the remaining amount of the tape from the rotation speeds of the two reels and the length of the tape, and the fast-forwarding and rewinding of the tape is performed by the tape transport device. If the discrimination cannot be made by the discriminating means, the tape can be transferred at a predetermined speed lower than the transfer speed during the high-speed transfer at the limit speed. For example, for a tape and a reel of a type that cannot be determined by the determination means that may appear in the future, a predetermined speed lower than the transfer speed at the time of the high-speed transfer. And an object thereof is to cope by forming so as to be able to transport the tape at a speed.

[Means for solving the problem]

As shown in FIG. 1, for example, a tape transfer device according to the present invention is a tape transfer device for transferring a tape (6) from one reel (5) to another reel (4). Detecting means (26) and (22) for respectively detecting the rotation speed of the reel (4); determining means (26) for determining the length of the tape and the type of the other reel (4);
(22), (18) and (27), when the discriminating means can discriminate the length of the tape and the type of the other reel, the rotational speeds of the two reels (5) and (4) and the tape ( 6)
The tape is transported at high speed while calculating the remaining amount of the tape (6) from the length of the tape (6), and when the remaining amount becomes less than a predetermined value, the tape is decelerated. When the type of the reel (4) cannot be determined, the control means (27) for transferring the tape (6) at a predetermined speed lower than the transfer speed during the high-speed transfer is provided. When the length of the tape (6) and the type of the other reel (4) can be determined, the tape (6) can be transferred at a high speed. If the type of (4) cannot be determined, the tape (6) can be transferred at a predetermined speed lower than the transfer speed during the high-speed transfer. Indistinguishable types Also it is obtained as it may be dealt with by forming so as to be able to transport the tape (6) at a predetermined speed slower than the transfer speed during the high-speed transfer with respect to-loop and reel.

[Action]

According to the present invention, since the tape (6) is transferred while calculating the remaining amount of the tape (6), the tape (6) is transferred while the remaining amount exceeds the predetermined value. ) Can be transported at the hardware limit speed. When the remaining amount of the tape (6) becomes equal to or less than a predetermined value, the tape (6) is transported at a reduced speed. The tape (6) can be stopped without damaging the tape end.

Further, in the tape transfer device for transferring the tape (6) from one reel (5) to the other reel (4), when the length of the tape and the type of the other reel (4) can be determined, this tape ( 6) The fast-forward and rewind of the tape can be performed at a high speed at the limit speed of the tape transfer device. If the discrimination cannot be made, the transfer is performed at a predetermined speed lower than the high-speed transfer speed at the limit speed. The tape (6) can be transported. For example, a tape (6) and a reel (4) of a type that cannot be discriminated by the discriminating means that may appear in the future will be used during this high-speed transfer. This can be handled by transporting the tape (6) at a predetermined speed lower than the transport speed.

〔Example〕

Hereinafter, an embodiment of a tape transfer device according to the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a fast-forward and rewind mechanism of a VTR capable of loading tape cassettes having various reel hub diameters and tape lengths.

FIG. 1 shows a mechanism section of the present example. In FIG.
Reference numeral (3) denotes a loaded tape cassette. A video tape (6) is wound from a hub (5) on the supply reel side of the tape cassette (3) to a hub (4) on the take-up reel side.
A transparent leader tape (7A) and a trailer tape (7B) each having a predetermined length are connected to a tape top and a tape end of the video tape (6). Then, a light emitting element (8) is inserted into the tape cassette (3) from the mechanism side of the VTR, and a top sensor (a light receiving element) is provided on the take-up reel side so as to face one surface of the light emitting element (8). 9A), and an end sensor (9B) comprising a light receiving element on the supply reel side facing the other surface of the light emitting element (8).
The video tape (6) is the supply reel hub (5)
When the video tape (6) is wound on the take-up reel hub (4), the top signal (T) of high level "1" is generated from the top sensor (9A). The end signal E of high level "1" is generated from the sensor (9B).

During recording and playback, the video tape (6) is inserted into a tape guide (10), a helical scan type rotating head drum (12), a tape guide (11) and a capstan (13).
The capstan (13) is transferred via a pinch roller (14) or the like, and rotated by a drive motor (15) via a belt (16). Further, (17) shows a slit disk fitted to the capstan (13), (18) shows a capstan FG (frequency generator) composed of a photo interrupter, and the capstan FG (18) shows the capstan FG. A signal CS having a frequency proportional to the rotation speed of the stun (13) is output. The slit disk (17) and the capstan FG (18) could be constituted by a magnetic encoder, for example.

A drive shaft (19) is provided on the hub (4) on the take-up reel side.
The drive shaft (19) is fitted with a drive disk (20) rotatable with the capstan (13) as needed, and the drive shaft (23) is mounted on the supply reel side hub (5). The drive shaft (23) is fitted with a drive disk (25) that is rotatable in an alternate manner with the drive disk (20) on the capstan (13) on the drive shaft (23). When the video tape is fast-forwarded, the capstan (13) is driven by the drive motor (15).
When the video tape is rewound, the drive motor (15) rotates the capstan (13) and the supply reel-side hub (5) to the rewind side. To do so. In addition, a drive motor is provided separately from the drive motor (15) for the capstan (13), and the drive shaft (19) on the take-up reel side during fast-forward or rewind, respectively.
Alternatively, the drive shaft (23) on the supply reel side may be driven independently.

Further, (21) is a slit disk fitted on the drive shaft (19) of the take-up reel, (22) is a take-up reel FG composed of a photo interrupter, and (25) is a drive shaft (23) of a supply reel.
(26) shows a supply reel FG composed of a photo interrupter, and a take-up reel FG thereof.
(22) and a signal RS _{1 having} a frequency proportional to the rotation speed of the hub (4) on the take-up reel side from the supply reel FG (26).
And the signal RS ₂ with a frequency proportional to the rotational speed of the supply reel side of the hub (5) is output.

Also, (27) shows a central processing unit (CPU), (28) shows a drive circuit, and the CPU (27) is a top sensor (9
A) Top signal T, End sensor (9B) End signal E,
Capstan FG (18) signal CS, take-up reel FG (22)
Signal RS ₁ and captures the signal RS ₂ of the supply reel FG (26) of,
Its drive motor (15) through its drive circuit (28)
Drive. Specifically, CPU (27) supplies the setting voltage DV ₁ to the drive circuit (28), the driving voltage output simultaneously to the drive motor (15) from the drive circuit (28)
Monitor DV ₂ .

The operation when the video tape is fast-forwarded by the VTR of this example will be described with reference to the flowchart of FIG.
First, in the loaded tape cassette, the video tape is completely rewound to the hub on the supply reel side.
It is assumed that the type of the loaded tape cassette is unknown. At present, there are types of tape cassettes as shown in Table 1.

From Table 1, there are two types, one with a relatively small radius and the other with a relatively large radius, when classified by the radius of the reel hub. There are 3 types, 9 types in total (= 3 ×
It can be seen that there is a tape cassette of about 3). Furthermore,
This type is expected to increase in the future.

Therefore, the type of the tape cut loaded is determined in step (101) of FIG. In this case, as shown in FIG.
In the state of being sandwiched between 3) and the pinch roller (14), a small voltage is supplied to the drive motor (15), and the capstan (13) and the capstan (13) and The take-up reel-side hub (4) is rotated at a low speed. In this example, capstan FG (18) and take-up reel FG
(22) Since the supply reel FG (26) is provided, it is possible to measure the time required for the hub (5) on the supply reel side to make one rotation, and to measure the time required for the hub (5) to make one rotation. rotational speed N _c and N _w of each of the 13) and the take-up reel side of the hub (4) can be measured. Moreover, therefore the radius r _c is also known capstan (13), when the distance the supply reel side of the hub (5) is the video tape in time of one rotation (6) is transferred l ₀ , L ₀ = 2πr _c N _c , and the distance l ₀ is obtained.

The radius of the hubs (4) and (5) is r, and the radius of the video tape (6) completely rewound on the hub (5) is R.
Then, from FIG. 4, since l ₀ = 2πR l ₀ = N _w 2πr holds, the radius r of the hubs (4) and (5) and the radius R of the video tape (6) are obtained. Further, since the thickness of the video tape is known, the diameter of the reel hub and the length of the loaded tape cassette can be determined from the information of the radii r and R.

It is generally not clear whether the video tape (6) is completely rewound on the hub (5) of the supply reel. The value area is tabulated, and the type of the tape cassette is determined from the table. If, for example, a 60-minute video tape is wound on the take-up reel side for 30 minutes as described later, a situation may occur in which the type of the tape cassette cannot be determined.

The CPU (27) in the example of FIG. 1 checks whether or not the discrimination of the type of the tape cassette has been decided in step (102), and when the discrimination has been decided, sets the discrimination flag to high level "1" (step (103)). If the determination is not determined, the determination flag is set to low level “0” (step (10)
Four)). Then, the CPU (27) moves to the step (105) while separating the pinch roller (14) from the capstan (13) and rotating the hub (4) on the take-up reel side gradually and quickly as shown in FIG. Then, it is checked again whether or not the discrimination of the type of the tape cassette has been determined. Since the operation this time is started from a state in which the video tape is completely wound, the type determination has been determined (determination flag = “1”). Therefore, the operation of the CPU (27) shifts from step (105) to step (106).

In step (106), the CPU (27) calculates the remaining amount of the video tape. First, as shown in FIG. 5, the length of the tape wound around the hub (4) on the take-up reel side is ₁ and the length of the tape wound on the hub (5) on the supply reel side (that is, The remaining amount of tape is l ₂ , the rotation speed of the hub (4) on the take-up reel side is P ₁ , and the rotation speed of the hub (5) on the supply reel side is P
_Assuming that ₂ , the total length L (= l ₁ + l ₂ ) of the tape
Together are determined by 01), the rotational speed P ₁ and P ₂ may be measured from the respective take-up reel FG (22) and the supply reel FG (26). In this case, for example, Japanese Patent Publication No. 62-22197 discloses that the length l ₁ of the tape and the remaining amount l ₂ of the tape are represented by the following equations.

In the equations (1) and (2), A = L (T ² +1) / (T ² -1) (3) B = L / (T ² -1) (4) In (3) and (4), T represents P ₁ / P ₂ at the time of starting the tape (that is, l ₂ = L).

Therefore, the remaining amount l _{2 of the} video tape can be calculated from equation (2).

Next CPU (27) in step (107) in the remaining amount l ₂ of the video tape to determine whether it is less than a predetermined value, l ₂
Is larger than the predetermined value, the routine goes to step (108) to supply the maximum voltage to the drive motor (15). This, as shown in Figure 3, the rotation speed omega of the drive motor is set to omega ₂ is a limit of hardware, video tape (6) is transferred at a limit speed of the hardware. CPU (2
7) performs repeatedly the steps (106) - (108), the step when the remaining tape l ₂ in step (107) the tape position x reaches the x ₂ of FIG. 3 is equal to or less than a predetermined value ( the process proceeds to 109), set to omega ₁ by reducing the rotation speed of the drive motor (15). When this rotation speed omega ₁ has been made to detect the tape end, is set to the upper limit of the speed can be stopped the transport of video tapes without damaging the videotapes.

Next, in step (110), the CPU (27) in FIG.
Checks whether the end of the tape has been reached by monitoring the end signal E supplied from the end sensor (9B). Then, together with the end signal E to the tape position x reaches x ₁ is when it becomes high level "1", CPU (27) is set to 0 the drive voltage supplied to the drive motor (15),
The brake mechanism is operated (step (111)). This safely stops the video tape (6) before reaching the end point (x = x ₀ ).

Next, the operation when the determination of the tape type is not determined in step (102) in FIG. 2 which is the step at the start of the fast-forward will be described. Such an operation can occur when a fast-forward command is issued in a state where the video tape is wound about half of the entire length in the loaded tape cassette as shown in FIG. That is, in the tape cassette (3) in Figure 6 A, the radius of the reel hub r _1, of the take-up reel side hub radius R _1, the supply reel side of (4) wound videotape (6) Assuming that the radius of the video tape (6) wound around the hub (5) is R ₂ (R ₂ ≒ R ₁ ), FIG.
In the tape cassette (29), the radius of the reel hub is
r ₃ , the radius of the video tape (32) wound on the take-up reel side hub (30) is R ₃ , and the radius of the video tape (6) wound on the supply reel side hub (31) is R Assume that r ₁ ≪r ₃ and R ₁ ≒ R ₃ hold as ₄ (R ₄ ≒ R ₃ ). In this case, in order to determine the type of the loaded tape cassette,
The video tape (6) or (32) is sandwiched between the capstan (13) and the pinch roller (14), and the hub (5) or (31) on the supply reel side rotates for one rotation. ) Or (32), since the information obtained from the case of FIG. 6A and the case of FIG. 6B is the same, whether the loaded tape cassette is (3) (29) Cannot be determined.

In the case of the example of FIG. 6, the CPU (27) of the example of FIG. 1 sets the roll level “0” in the discrimination flag (step (104)), and proceeds to step (105). However, since the discrimination of the tape type has not been determined, the operation of the CPU (27) shifts to step (112) to release the pinch roller (14) and drive motor (15) as in the example of FIG. the driving motor as shown in FIG. 7 by supplying a low voltage (15) to rotate at a rotational speed omega ₁ in. As mentioned above,
The rotation speed omega ₁ is the velocity which can safely stop the video tape when the tape end is detected.

Next, in step (113), the CPU (27) determines the type of the loaded tape cassette. Information supplied to the CPU (27) is only the rotational speed P ₂ of the rotational speed P ₁ and the supply reel side of the take-up reel side in the step (113). Therefore, the discrimination of the tape type in step (113) is performed by a method different from the discrimination of the tape type in step (101). That is, although there are many types of tape cassettes, there are areas that can occur only in a specific tape cassette in the area of the value of the rotational speed ratio P ₁ / P _2. Rotational speed ratio P ₁ / P ₂ that can only occur in that tape cassette
Are previously tabulated. Then, in step in (113), the ratio P ₁ / P ₂ is a specific low speed to a value not occur only in the tape cassette (even if the low speed corresponding to the maximum feeding speed of the conventional example.) If the type of the tape cassette can be determined when the video tape is transferred and reaches the tape position x3 as shown in FIG.
In (27), the high level “1” is set in the determination flag, and the process returns to step (105).

Then, in step (106), the remaining amount of the tape is calculated. If the remaining amount of the tape is larger than a predetermined value, the highest voltage is supplied to the drive motor (15) and the drive motor (1) is supplied.
5) The rotating at maximum speed limit omega ₂ (step (107),
(108)). Subsequent processing is the same as in the example of FIG.

As described above, according to the present embodiment, the type (reel hub diameter and tape length) of the loaded tape cassette is determined at the start of the fast-forward, so what kind of tape cassette is loaded Even in such a case, since the remaining amount of the tape can be calculated accurately, there is an advantage that the video tape can be transferred at a high speed at a hardware limit speed until the remaining amount of the video tape becomes a predetermined value or less.

Further, if the type of the tape cassette cannot be determined at the start of the fast-forward, the video tape is transferred at a speed at which it can be safely stopped at any time (although it is a speed corresponding to the conventional maximum feed speed). Since the video tape is transferred at the limit speed when the type of the tape cassette can be determined, there is an advantage that the tape can be transferred safely and at high speed.

In the above embodiment, the loading position of the video tape is on the front side of the tape cassette. However, the present invention can be applied to a case where the video tape is so-called hard loading or a case where the video tape is wound around a rotating head drum (high-speed search mode). This can be applied to the case where rewinding is performed at a higher speed.

Further, the present invention can be applied not only to a VTR but also to all devices using a tape such as an audio tape recorder. Further, instead of the end sensor (9B), the end may be detected from the torque of the drive motor (15) or the like.

As described above, the present invention is not limited to the above-described embodiment, and may adopt various configurations without departing from the spirit of the present invention.

〔The invention's effect〕

According to the present invention, when the discriminating means can discriminate the length of the tape and the type of the other reel, the tape can be moved at a high speed while calculating the remaining amount of the tape from the rotation speeds of the two reels and the length of the tape. Transport, and decelerate the tape when the remaining amount is less than a predetermined value, so that the remaining amount of the tape does not exceed the predetermined value regardless of the length of the loaded tape. During this time, it is possible to easily perform fast forward and rewind of the tape at the maximum speed that can be realized by the tape transfer device at a high speed, and when the determination unit cannot determine the length of the tape and the type of the other reel. Since a control means is provided which enables the tape to be transferred at a predetermined speed lower than the transfer speed at the time of the high-speed transfer, it is possible to make a determination with this determination means which may appear in the future. There are benefits to be dealt with by forming so that it can also transfer the tape predetermined speed slower than the transfer speed during the high-speed transfer with respect to have the type of tape and reel.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a VTR according to one embodiment of the present invention,
2 to 7 are diagrams for explaining the operation of the example shown in FIG. 1, and FIG. 8 is a diagram for explaining the tape speed at the time of fast-forwarding of the conventional VTR. (4) a take-up reel side hub, (5) a supply reel side hub, (6) a video tape, (13) a capstan, (14) a pinch roller, (15) a drive motor, (15) 1
8) Capstan FG, (22) Take-up reel FG, (2
6) is a supply reel FG.

Claims (1)

(57) [Claims] 1. A tape transfer device for transferring a tape from one reel to another reel, comprising: detecting means for detecting rotation speeds of the one reel and the other reel, respectively; Discriminating means for discriminating the type of the reel, and when the discriminating means can discriminate the length of the tape and the type of the other reel, the rotational speed of the two reels and the length of the tape are used to determine the type of the tape. The tape is transported at a high speed while calculating the remaining amount, and when the remaining amount falls below a predetermined value, the tape is decelerated, and the length of the tape and the type of the other reel are determined by the determining means. Control means for transferring the tape at a predetermined speed lower than the transfer speed during the high-speed transfer when the transfer cannot be performed.