JP3141240B2 - Tape loading device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tape loading device applied to a tape loading device such as a VTR.

[Summary of the Invention]

The present invention is a tape loading device that can accurately detect the tape tension during the loading as well as the tape tension so as not to damage the tape during the loading, not only after the tape is loaded, but also a tape pulling arm. A first arm rotated by a driving means, and a second arm rotatably mounted on the first arm and pulling out the tape from the unloading position to the loading position with the rotation of the first arm. A step configuration is employed, in which a change in the tape tension is detected based on a change in the angle of the second arm with respect to the first arm, and a reel motor is controlled using the detection result to control the tape tension.

[Conventional technology]

As a conventional recording / reproducing apparatus, for example, as seen in a prior application example (Japanese Patent Application No. 1-181347) by the applicant of the present invention,
A tension detection pin is provided at the tip of the tape pull-out arm, and when loading the magnetic tape, the tape pull-out arm is driven to rotate by a spring, and the tension detection pin pulls the magnetic tape supply reel side from the unloading position to the loading position. When the magnetic tape travels during recording, reproduction, etc. after tape loading, the position of the tape pull-out arm when the tension of the magnetic tape and the spring are balanced is detected by a tension sensor, and the detected signal causes the back of the supply reel motor to return. In some cases, the back tension of the magnetic tape is controlled by controlling the hold torque so that the tension detection arm is held at a fixed position.

[Problems to be solved by the invention]

By the way, during the loading of the magnetic tape, a large variation in the tension of the magnetic tape tends to occur due to a change in the reel inertia caused by a change in the tape winding diameter of the supply reel and the take-up reel.

However, in the detection of tape tension using a tape pull-out arm in a conventional recording / reproducing apparatus, the state before the tension detecting arm (tape pull-out arm) is moved to a fixed position, that is, the tape tension during loading of a magnetic tape, is detected. It could not be detected accurately.

Therefore, in the conventional tape loading device, the back tension of the magnetic tape during the loading cannot be accurately controlled, and the magnetic tape is prevented from being damaged due to excessive tape tension during the loading. There is a problem that the loading speed must be reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape loading device capable of accurately detecting a tape tension during and after loading a tape and controlling the tape tension.

[Means for solving the problem]

In order to achieve the above object, a tape loading device according to the present invention includes a first arm that is driven by a driving unit to rotate between an unloading position and a loading position, and a rotatable shaft with the first arm. Supported, the first arm can be pulled out from the unloading position to the loading position by rotating the first arm from the unloading position to the loading position.
An arm, an urging means provided between the second arm and the first arm, for urging the second arm to rotate in a direction for loading the tape, and an urging force of the urging means. Detecting means for detecting a rotation angle of the second arm with respect to the first arm, which is determined by a state of equilibrium with the tension of the tape added to the second arm; a reel motor driven by a motor amplifier; A control circuit for receiving a detection value from the means, outputting a control signal to the motor amplifier based on the detection value, and performing drive control of the reel motor. Compare the detected value with a preset target value during loading,
Control the tape feed speed by the reel motor so that the detected value is equal to the target value during the loading, at the time of running of the tape after loading,
The detected value is compared with a preset target value at the time of running of the tape after loading, and the reel motor is operated so that the detected value becomes equal to the target value at the time of running of the tape after loading. It was configured to control the running speed of the tape.

[Action]

According to the tape loading device configured as described above, the tape tension can be detected even during the loading of the tape, and the tape tension during the loading can be controlled.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a tape loading device of a VTR will be described with reference to the drawings.

First, an outline of the tape loading device will be described with reference to FIG.

When the tape cassette 1 is mounted at the cassette mounting position by a cassette mounting device (not shown), the supply reel 3a and the take-up reel 3b around which the magnetic tape 2 is wound are moved to the supply reel table 4a and the take-up reel 3b. It is mounted on the reel base 4b.

The mounting of this tape cassette 1 is performed by a sensor (not shown).
Is detected, the supply-side tape loading means 5a and the winding-side tape loading means 5b comprising a plurality of movable tape guides move from an unloading position indicated by a dashed line to a loading position indicated by a solid line (not shown). ), The feed-side tape pull-out arm 6a and the winding-side tape pull-out arm 6b move from the unloading position indicated by the dashed line to the loading position indicated by the solid line.
It is rotated in the directions of arrows c and d about a and 7b.

Then, the magnetic tape 2 in the tape cassette 1 is moved from the position indicated by the alternate long and short dash line to the position indicated by the solid line.
The magnetic tape 2 is pulled out by the tape pull-out arms 5a, 5b and both tape pull-out arms 6a, 6b, and is substantially M-shaped loaded on the peripheral surface of the rotary head drum 8, and a plurality of fixed heads (full width erasing head, audio head , CTL head, etc.) 9, a capstan 10, and a plurality of fixed tape guides 11.

When the mode is switched to the recording / reproduction mode or the like after the tape loading, the pinch roller 12 pulled out in the direction of arrow d by the winding-side tape pull-out arm 6b holds the magnetic tape 2 by a pinch roller pressing device (not shown). After being pressed against the capstan 10, the supply reel table 4a and the take-up reel table 4b are rotated by the supply reel motor 13a and the take-up reel motor 13b.

Then, the magnetic tape 2 is taken up from the supply reel 3a to the take-up reel.
In order to be wound around 3b, the vehicle travels at a constant speed on a traveling path indicated by a solid line, and the rotary head drum 8 records and reproduces video signals.

The unloading operation of the magnetic tape 2 is the reverse of the above-described loading operation.

Next, the tape tension detecting device 15 will be described with reference to FIGS.

First, as shown in FIGS. 2 to 4, the supply side tape pull-out arm 6a has a two-stage configuration of a first arm 16 and a second arm 17 rotatably attached to the first arm 16. It is configured. The first arm 16 is rotatably mounted in a direction indicated by arrows c and c 'via a first fulcrum shaft 20 and a bearing 21 perpendicular to a vertical bearing 19 fixed to the chassis 18.
The second arm 17 has a second fulcrum shaft 23 perpendicular to a vertical bearing 22 integrally formed at a substantially middle position in the longitudinal direction of the first arm 16.
The second arm 17 has a vertical tape pull-out guide 25 composed of a rotating roller mounted on the upper end of the second arm 17 so as to be rotatable in the directions of arrows e and e '. A spring engaging portion 26a integrally formed on the vicinity of the distal end of the first arm 16 and a screw 2
A tension spring 28, which is a biasing means, is attached to a spring locking plate 26b fixed by 7 and allows the second arm 17 to move around the second fulcrum shaft 23 with respect to the first arm 16 by the tension spring 28. It is urged to rotate in the direction of arrow e, and abuts against a stopper pin 29 fixed on the first arm 16. The projection 30 formed integrally with the outer periphery of the second fulcrum shaft 23 of the second arm 17 is brought into contact with the stopper surface 31 formed integrally with the first arm 16, so that The rotation angle of the second arm 17 in the direction of the arrow e 'is restricted.

Next, as shown in FIGS. 2 to 5, a tension sensor 33 for detecting the angle of the second arm 17 with respect to the first arm 16 is provided with a DME (DIVIDED MAGNETIC
ELEMENT) 34 and a non-contact type sensor using a pair of magnets 35. Then, a DME substrate 36 having the DME 34 fixed to the lower surface by bonding or the like is mounted on a horizontal mounting plate 37.
The mounting plate 37 is horizontally fixed by a pair of screws 38 on the upper side, and the mounting plate 37 is horizontally fixed by the screws 39 and the positioning pins 40 on the first arm 16 and is horizontally inserted into the circular window 39a of the mounting plate 37. The DME 34 is disposed directly above the second fulcrum shaft 23.
The pair of magnets 35 is a U-shaped magnet mounting plate.
The magnet 41 is fixed by bonding or the like so as to oppose the magnet 41, the center of the magnet mounting plate 41 is horizontally fixed by a screw 42 directly above the second fulcrum shaft 23, and a pair of magnets 35 are arranged on both sides of the DME 34. Have been.

Next, as shown in FIG. 6 and FIG.
A driving ring 44, which is rotationally driven by a motor (not shown) to reciprocally drive the pair of tape loading means 5a and 5b between an unloading position and a loading position; The intermediate gear 4 meshed with the outer peripheral gear 45a of the loading ring 45
6, a sector gear 47 meshed with a small gear 46a coaxial with the intermediate gear 46, and mounted on a common rotating shaft 48 with the sector gear 47, and connected to the sector gear 47 via a limiter spring 49. A rotating arm 50 and one end of the rotating arm 50 is a pin 51a.
And the other end is connected to the first arm 1 via a pin 51b.
6 and a link 52 connected to the link 6. The limiter spring 49 is constituted by a compression spring. The limiter spring 49 is fitted in an arc groove 53 formed in the sector gear 47, and both ends 49a and 49b of the limiter spring 49 are provided.
Are a pair of protrusions 50a, 50b formed integrally with the rotary arm 50.
Are alternately pressed.

Next, the operation of the tape tension detecting device 15 will be described.

First, at the time of tape loading, as shown in FIG. 6, the sector ring gear 47 is driven to rotate in the direction of the arrow f by the loading ring 45 via the intermediate gear 46, and as shown in FIG. Pushes one end 49b of the limiter spring 49 in the direction of arrow f, and pushes the other end 49a of the limiter spring 49 in the direction of arrow f when the other end 49a is on the other hand.
And the first arm 16 is moved to the first
Pivot shaft 20 around the sixth from the unloading position P ₁ of the one-dot chain line in FIG to the loading position of the solid line is rotated by a large angle theta ₁ in the direction of arrow c to a.

At this time, the second arm 17 is rotated in the direction of arrow c from the unloading position P ₁ by the tension spring 28 together with the first arm 16 to the loading position P _2, magnetic by the tape pull-out guide 25 at the tip of the second arm 17 The tape 2 is pulled out in the direction of the arrow c from the unloading position indicated by the alternate long and short dash line in FIG. 8 to the loading position indicated by the solid line.

During the tape loading, the fourth
As shown in the drawing, the back tension of the magnetic tape 2 is applied to the tape pull-out guide 25 of the second arm in the direction opposite to the rotational biasing direction (direction of arrow e) by the tension spring 28 (direction of arrow e ').
Is added to Accordingly, during this tape loading, the second arm 17 moves in the direction of the arrow e 'against the first arm 16 against the tension spring 28 about the second fulcrum shaft 23 in accordance with the change in the back tension of the magnetic tape 2. , The angle θ ₂ of the second arm 17 with respect to the first arm 16 changes.

Then, as shown in FIG. 5, according to the change of the angle theta _2, the pair of magnets 35 around the DME34 the tension sensor 33 is rotated in the arrow e, e 'direction, DME34
As a result, the output voltage of the DME 34 changes, and the tension sensor 33 can accurately detect the back tension of the magnetic tape 2 by changing the angle θ ₂ of the second arm 17 with respect to the first arm 16. .

As a reference for controlling the back tension of the magnetic tape 2, the relationship between the designed tape pull-out amount by the tape pull-out guide 25 and the wrap angle of the magnetic tape 2 with respect to the tape pull-out guide 25 can be used. Fig. 9
The tape withdrawal amount A by the designed tape withdrawal guide 25,
Wrap angle B of magnetic tape 2 with respect to tape pull-out guide 25
It is a graph which shows the correspondence relationship with. During the actual loading of the tape, the feeding amount of the magnetic tape 2 from the reel is controlled, and the tape drawing amount and the tape drawing guide are controlled.
If the correspondence between the wrap angle of the magnetic tape 2 and 25 is as shown in this graph, a designed tape tension can be obtained.

The wrap angle of the magnetic tape 2 with respect to the tape pull-out guide 25 can be geometrically determined from the tape pull-out amount and the position of the tape pull-out guide 25. Therefore, the first
By detecting a change in the angle of the second arm 17 with respect to the arm 16, the wrap angle of the magnetic tape 2 with respect to the tape pull-out guide 25 during the actual loading of the tape can be obtained. That is, the second arm 17 with respect to the first arm 16 during tape loading in design.
The angle of the second arm 17 with respect to the first arm 16 at the time of actual loading is detected based on the angle of
If the back hold torque of the reel motor is controlled so that the angle becomes equal to the reference angle, as a result, the tape pullout amount A and the wrap angle B of the magnetic tape 2 with respect to the tape pullout guide 25 shown in FIG. The relationship can be satisfied during actual tape loading.

Therefore, as shown in FIG. 1, during tape loading, a back tension detection value which is the tape tension of the magnetic tape 2 detected by the tension sensor 33 is supplied to the tension control circuit 55, and the back tension target value during tape loading is supplied. By feeding back to the supply reel motor 13a and the motor amplifier 56 to control the back hold torque of the supply reel motor 13a, the back tension of the magnetic tape 2 during the tape loading can be easily reduced to a stable low tension. And can be controlled accurately.

As a result, it is possible to prevent the occurrence of excessive tape tension in the magnetic tape 2 during tape loading, and to significantly improve the loading speed of the magnetic tape 2.

Note that, as shown in FIG.
When the arm 16 is rotated in the arrow c direction to the loading position P _2, the first arm 16 is fixed by abutting against the limiter spring 49 on one of the stopper 57a. Therefore, after the tape loading, the first arm 17 is fixed at the fixed position, and the second arm 17 is moved to the first arm 17 in accordance with the change of the back tension during the running of the magnetic tape 2 at the time of recording or reproduction. The arm 16 is rotated in the directions of arrows e and e 'against the tension spring 28, and the tension sensor 33 detects the back tension of the magnetic tape 2 after the tape is loaded, just as during the tape loading.

Also, at the time of tape loading, the first arm 16 is rotated in the direction of arrow c 'to the unloading position by the reverse operation of the above-described tape loading, and the other stopper is rotated.
57b is abutted and fixed against the limiter spring 49.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, the second fulcrum shaft 23 is arranged at a position separated from the first fulcrum shaft 20, but the second fulcrum shaft 23 may be arranged on the same axis as the first fulcrum shaft 20.

〔The invention's effect〕

The present invention is configured as described above, and has the following effects.

Since the tape tension when loading the tape from the unloading position to the loading position can be accurately detected, the back-hold torque of the reel motor during the loading can be controlled to keep the tape tension low during the loading. It is possible to speed up the loading of the tape without causing excessive tension on the tape in the middle.

Further, even after the tape is loaded, the tape tension can be controlled by detecting the tape tension with the common tape loading device, and there is no need to provide a tension detecting device for detecting the tape tension after the loading. In addition, the configuration of the device can be simplified.

[Brief description of the drawings]

1 shows an embodiment of the present invention. FIG. 1 is a perspective view showing a tape tension detecting device and a supply reel motor. FIG. 2 is an exploded perspective view of the tape tension detecting device. FIG. 4 is a partially cutaway side view of the tape tension detecting device, FIG. 4 is a partially cutaway plan view of the tape tension detecting device, FIG. 5 is a partially cutaway plan view showing a tension sensor, and FIG. FIG. 7 is a plan view showing a limiter spring, FIG. 8 is a plan view showing an outline of a tape loading device, and FIG. 9 is a tape withdrawal amount and a wrap angle. 6 is a graph showing a relationship with the graph. In still code used in the drawings, 2 ...... magnetic tape (tape) 15 ...... tape tension detecting device 16 ...... first arm 17 ...... second arm 33 ...... tension sensor 44 ...... driving means P ₁ ...... Ann Loading position P ₂ ... is the loading position.

Claims (1)

(57) [Claims] A first arm which is driven by a driving means to rotate between an unloading position and a loading position; and a first arm rotatably supported by the first arm, wherein the first arm is unloaded. A second arm capable of pulling out a tape from an unloading position to a loading position by rotating from a position to the loading position; and a second arm provided between the second arm and the first arm. To the first arm determined by the balance between the biasing force of the biasing means and the tension of the tape applied to the second arm. Detecting means for detecting a rotation angle of the second arm, a reel motor driven by a motor amplifier, and detecting from the detecting means And a control circuit that outputs a control signal to the motor amplifier based on the detected value to perform drive control of the reel motor. The control circuit detects the detection during the tape loading operation. The value is compared with a preset target value during the loading, and the tape feeding speed of the reel motor is controlled so that the detected value becomes equal to the target value during the loading. At the time of running, the detected value is compared with a preset target value at the time of running of the tape after loading, and the detected value is set to be equal to the target value at the time of running of the tape after loading. A tape loading device for controlling a running speed of a tape by a reel motor.