JP2633970B2 - Tape guide for magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide in a magnetic recording / reproducing apparatus, and more particularly to a structure of a tape guide suitable for preventing tape damage.

[Conventional technology]

In a tape running system of a magnetic recording / reproducing apparatus, it is necessary to accurately align a tape with a lead provided on a drum in order to ensure linearity of a video track. For this purpose, flanges are provided on the tape guides arranged on both sides of the drum, and the tape is sandwiched from above and below by the upper flange and the lead of the drum so that the tape follows the leads. Further, a flange is provided on some of the tape guides between the supply and take-up reels in the cassette so as to regulate the running height of the tape so that the tape can more easily follow the lead of the drum. .

On the other hand, with recent tape thinning, the rigidity of the tape is greatly reduced, and the surface property is improved, so that the surface friction coefficient is increased.

In the conventional device, the flange of the tape guide has a surface perpendicular to the cylindrical axis of the tape guide, and the running height of the tape is regulated by this surface. Japanese Patent Application Laid-Open No. 61-233452 discloses a device related to this type of device.
However, when the tape is regulated in such a plane, the tape is deformed or buckled at the edge of the tape regulated by the flange due to the low rigidity of the tape and the difference between the flange plane and the running direction of the tape. Occurs and damages the tape edge. In particular, if the tape guide is of a rotating roller type, the tape moves greatly upward or downward even with a slight deviation between the rotation direction of the roller and the running direction of the tape,
Large tape deformation occurs. One cause of such a phenomenon is that, since the plane of the flange is larger than the tape guide diameter by a predetermined amount, even in an area where the tape is not wound around the tape guide, the tape end is regulated by the flange. And the tape is deformed. Therefore, there has been proposed a system in which the flange is not flat, but has a conical shape with a slight taper angle, and the height is restricted only at the portion where the tape is wound.

In addition, the tape guide is a fixed system instead of a rotation,
There is a method in which a spacer or the like is inserted between the tape guide and the flange from a predetermined direction opposite to the side on which the tape is wound to incline the flange. By tilting the flat flange, the height is restricted only at the part where the tape is wrapped, and the regulating force is strong at the center part of the tape winding and weakens as it approaches the entrance of the winding. Thus, tape deformation is prevented.

[Problems to be solved by the invention]

In the above-mentioned prior art, for the conical flange, because the flange for regulating the height is parallel to the tape,
It is difficult to completely restrict the tape in parallel with the flange due to the deviation of the accuracy of the tape guides of the apparatus or the deviation of the running height of the tape, and the regulating force tends to be excessive near the entrance and exit of the tape winding. For this reason, there has been a problem that the consideration for the low rigidity tape is insufficient, and the tape is deformed.

Further, as another conventional technique, in which the flange is inclined, the tape guide is of a fixed type, so that the running load of the tape in the tape guide increases, and there is a problem that the thin tape is damaged or the head touch is deteriorated. In addition, if the system inserts a spacer to tilt the flange, the thickness of this spacer is adjusted to prevent tape deformation due to deviations in the accuracy of the tape guides of the device and changes in the tape running position due to variations in tape tension. It is necessary to set it to a value that is necessary and sufficient to do so. On the other hand, since the diameter of the tape guide is small, there is a problem that it is difficult to insert a spacer into the tape guide to control the inclination of the flange with high accuracy. Further, when using a spacer having a predetermined thickness, if the tape cannot be prevented from being deformed due to an error in the tape running path or the like, it is necessary to change the spacer again to one having a different thickness. . Also, depending on the accuracy of the running route, the running height is regulated more than necessary near the center of the tape winding.If the tape is run for a long time or at high speed in this state, heat is generated due to the sliding of the tape and the flange. However, there is a problem that the tape is damaged.

An object of the present invention is to solve the above-described disadvantages of the prior art, prevent damage due to deformation of the tape, reduce the running load of the tape, and provide a tape with a minimum necessary regulating force. To provide a guide.

[Means for solving the problem]

In order to achieve the above object, the present invention comprises a flange for regulating the running height of a tape, and a guide member for determining the height of the flange, and the guide member has a plurality of heights for defining the height of the flange. An adjusting part is provided so that the flange is inclined with respect to the axis.

Further, in the present invention, the flange for regulating the running height of the tape has a conical shape, and the center of the conical shape is held at a position eccentric to the center of the shaft by a predetermined amount.

[Action]

The flange portion of the tape guide has a structure capable of adjusting the inclination of the tape guide with respect to the axis independently of the guide portion for guiding the tape on the peripheral surface. Therefore, the height of the flange surface that regulates the height of the end portion of the tape differs around the guide portion. This makes it possible to gradually increase the restricting force from the end of the tape at the portion where the tape is wound around the guide, and conversely, gradually reduce the restricting force. Because of this structure, the angle of inclination of the flange can be adjusted, so that the regulation force on the tape can be adjusted in accordance with variations in the tape traveling path due to errors in setting the accuracy of the tape guide and the tension value, and the like. Optimal regulatory power can be provided.

Further, the flange portion that regulates the height of the tape end is chamfered obliquely, and the central axis of the flange is eccentric by a predetermined amount with respect to the central axis of the guide portion that guides the tape. As a result, the height of the flange portion that regulates the height of the tape end around the guide portion is different, and, similarly to the above, the regulating force is gradually applied to the portion wound around the guide from the end of the winding. It can be strengthened and vice versa.

〔Example〕

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

FIG. 2 is a plan view of the entire apparatus, showing a state of unloading. Reference numeral 1 denotes a chassis, and 2 denotes a drum on which a rotating magnetic head is mounted. Reference numeral 3 denotes a cassette containing a supply reel 4 and a take-up reel 5. A predetermined amount of magnetic tape 6 is wound on both reels, and a leader tape is connected to both ends of the magnetic tape 6 so that both reels 4 and 5 are mounted. Is engaged. An opening 7 is provided on the front surface of the cassette 3, and the magnetic tape 6 is stretched around the opening 7 by guides 8 and 9 in the cassette 3. When the cassette 3 is mounted on the apparatus as shown in the figure,
Inside the opening 7, there are tape guides 10 and 11, guide rollers.
12 and 13, the fixed guides 14 and 15, and the pinch roller 16 are inserted. The tape guide 10 is a shaft 17 to be erected on the chassis 1.
It is installed at one end of an arm 18 that is rotatable around. The guide roller 12 and the fixed guide 14 are erected on the base 19 while maintaining a predetermined positional relationship with each other. A positioning pin 20 is also erected on the base 19 at the head thereof. Guide roller 13
The fixed guide 14 and the fixed guide 14 are set on the base 21 while maintaining a predetermined relationship with each other. Similarly, the pin 22 is also set. Both bases 19 and 21 are guide plates fixed to the chassis 1 by a mechanism described later.
Each of them can move along grooves 24 and 25 provided in 23. Fixing means 26 and 27 are arranged at the ends of both grooves 24 and 25. The tape guide 11 is installed at one end of an arm 28 rotatable around a shaft 27 set on the chassis 1, and the other end of the arm 29 rotatable around the axis of the tape guide 11 is provided with a pinch roller 16. Has been planted.

FIG. 3 is a plan view of the entire apparatus, showing a state in which loading is completed. Tape loading consists of four operations for pulling out the tape and two operations for controlling the attitude of the tape. First, four operations will be described. The tape guide 10 performs tape loading on the supply side by the rotation of the arm 18, and winds the tape 6 around the guide 30 and the tension pin 31 near the supply reel 4. Tension pin 31
Is mounted on one end of an arm 33 rotatable around a shaft 32, and a spring 36 is stretched between a shaft 35 at the other end of the arm 33 and a pin 35 mounted on the chassis 1, The arm 33 is biased counterclockwise. A tape end detector 37 is inserted into a traveling system between the guide 30 and the tension pin 31. On the other hand, the tape on the take-up reel 5 side is rotated by the rotation of the arm 28. A pinch roller 16 is further connected to the end of the tape guide 11, and the loading operation will be described later. The tape is stretched around a guide 38 near the take-up reel 5 by the tape guide 11. A tape end detector 39 is arranged near the guide 38. Meanwhile base 19 and
21 moves while pulling out the tape 6 along the grooves 24 and 25, and is fixed to fixing means 26 and 27, respectively, and the tape is wound around the drum 2. When loading is completed, the base 19 is at a lower position than at the time of unloading, and conversely, the base 21 is at a higher position. Therefore, the guide plate 23 is not a flat plate but a three-dimensional shape. Therefore, the inclination angle of the drum 2 can be set smaller than in the case of the parallel loading method. In the traveling system between the tape guide 10 and the guide roller 12, an inclined guide 40, a fixed head 41, and a fixed guide 42 are arranged. The inclined guide 40 is for allowing the tape coming out of the supply reel 4 to reach the guide roller 12 having a different height and angle, and is inclined at a predetermined angle and direction. The fixed guide 42 regulates the winding of the tape around the fixed head 41, and the fixed head 41 erases a signal recorded over the entire width of the tape. Guide roller 12
Changes the running direction of the tape, and the fixed guide 14
To guide the tape without difficulty. Similarly, the traveling system between the guide roller 13 and the tape guide 11 includes an A / C head 4
3. The fixed guide 44, the inclined guide 45, the guide 46, and the capstan 47 are arranged. The A / C head 43 records or reproduces an audio signal, a control signal for controlling tape running, and the like, and the wrap angle is regulated by a fixed guide 44. The inclination guide 45 is for correcting the tape attitude in order to return the tape 6 wound on the drum 2 to the take-up reel 5, and is inclined at a predetermined angle and direction. The guide 46 regulates the winding of the tape around the A / C head 43 and the capstan 47. A motor is connected to the lower end of the capstan 47, and the pinch roller 16 drives the tape 6 by contacting the capstan 47 with the tape 6 interposed therebetween. The fixed guide 15 is for changing the attitude of the tape 6 protruding from the drum 2.
Together with the above-mentioned inclined guide 45, the attitude of the tape is the same as that of the tape in the cassette.

In the unloading state shown in FIG. 2, the tape attitude correction guides 48 and 49 arranged in the area inside the tape running system.
3 is outside the tape running system when the loading is completed as shown in FIG. 3, and finally has no effect on the running of the tape. That is, the tapes come into contact with the tape during loading and unloading, and
And 15 to correct the posture of the tape drawn out so as not to apply excessive force to the tape.

Next, the structure of the tape guide will be described with reference to FIGS. 1 and 4 to 10. The tape guide described in the present invention is particularly effective for use in a tape guide that strongly regulates the running height of the tape, for example, the guide rollers 12 and 13, but the use place is naturally limited to the above guides. Not something.

FIG. 1 is a partial sectional view and a top view of an embodiment according to the present invention. A shaft 51 is planted on the base 50, and the shaft 51
Bearings 53 are inserted into the center of the
Is rotatably supported. Below the lower bearing 53 is a lower flange 56, which is urged upward by a spring 52 from below to apply a predetermined preload to the bearing 53. On the other hand, on the upper bearing 53, there is an upper flange 55 via a sleeve 57, and further above there is an adjustment base 58. The sleeve 57 is inserted concentrically into the shaft 51, and the adjustment base 58 has an outer peripheral portion at its tip,
It is engaged with the inner peripheral portion of the sleeve 57 to center the shaft 51. The upper flange 55 is engaged with the outer peripheral portion of the adjustment base 58 to relatively center the shaft 51. Further, a threaded portion is provided at the tip of the shaft 51, and a threaded portion at the center of the adjustment base 58 is inserted to adjust the height of the roller 54, the upper flange 55 and the lower flange 56, and to use the above-described spring. 52 supports the preload on the bearing 53. After the adjustment base 58 is adjusted to a predetermined height, it is fixed by screws 60. Incidentally, the adjustment base 58 is provided with three screw holes at substantially equal intervals as shown in FIG. 1 (b), and adjustment screws 59 are respectively inserted. The lower end of the adjusting screw 59 abuts on the upper surface of the upper flange 55, and by adjusting the screwing amount of each adjusting screw 59, the upper flange 55 can be inclined in a desired direction. As described above, since the adjusting base 58 has a role of adjusting the height of the tape guide, the position of the adjusting screw 59 after the height adjustment is arbitrary with respect to the winding position of the tape around the roller 54. Therefore, the adjusting screw 59 is provided at three places so that the inclination can be adjusted in any direction. Upper flange
When the tape is inclined at 55, the height of the surface that regulates the tape height is a combination of a smooth curve and a straight line as shown in FIG. 9, and the height is the lowest in the inclined direction,
As you move away from it, its height gradually increases. Therefore, for example, if the inclination of the upper flange is adjusted toward the central portion of the winding of the tape around the roller 54, the restricting force of the tape height at this portion becomes the strongest, and as the distance from the winding position increases, the restricting force gradually becomes smaller. It weakens.
Normally, it is better to maximize the regulating force at the center of the winding as described above. The deformation of the tape, which is likely to occur at both ends of the winding start and end, may be different at both ends. In such a case, tape deformation can be prevented by shifting the inclination direction of the upper flange from the center direction of the winding by a predetermined amount and changing the regulating force on the tape. In general, it is preferable to adjust the inclination direction of the upper flange in a direction away from a portion where the tape is largely deformed. That is, for example, if the tape deformation at the start of tape winding is greater, the inclination direction of the upper flange is shifted to the end direction of tape winding.

Next, FIG. 4 shows another embodiment. This embodiment is different from the embodiment shown in FIG.
The centering of the shaft 61 is performed directly by the outer periphery of the shaft 61. Other structures are basically the same as those in FIG. According to the present embodiment, since the centering of the upper flange 55 can be performed without depending on the component accuracy of the adjustment base 64, etc., the adjustment work of the inclination of the upper flange can be easily performed.

FIG. 5 shows another embodiment. This embodiment is different from the embodiment shown in FIG. 1 in that the roller 62 is changed from a rotary type to a fixed type guide 65. Thus, there is no bearing 53, and the spring 52 merely serves to adjust the height of the tape guide. Since the guide 65 is fixed and does not rotate, even if the center axis of the guide 65 is slightly inclined with respect to the tape running due to the accuracy variation of the tape guide group in the tape running path, the moving force in the axial direction of the tape Is unlikely to occur,
Adjustment of the upper flange 55 is easy. Also, as in the other embodiments, in order to determine the inclination of the upper flange 55, the deflection by the adjusting screw 59 from the upper surface, the sleeve on the lower side,
Since the adjusting screw 59 is supported inside the contact point, it is easy to accurately receive the deflection by the three adjusting screws 59 and to make the inclination of the upper flange 55 predetermined.

Next, another embodiment will be described with reference to FIGS. The upper flange 69 has a conical shape in which a surface receiving the height of the tape is inclined by a predetermined amount. Further, the threaded portion on the upper part of the shaft 67 is provided at a position deviated by a predetermined amount Δl from the center axis of the shaft 67. Accordingly, the adjustment base 70 inserted into the screw portion and the upper flange 69 supported concentrically with the adjustment base 70 are displaced by Δl with respect to the shaft 67, that is, the roller 54. Therefore, the height of the oblique portion of the flange 69 that regulates the height of the tape around the roller 54 is
It becomes a smooth curve as shown in FIG. And the upper flange
The height of the flange surface in the direction in which 69 is eccentric with respect to the shaft 67 is the lowest. Therefore, the shaft 67 may be fixed to the base 50 so that the center direction of the tape winding and the eccentric direction of the upper flange are substantially the same. If the regulation of the tape running height is not symmetrical with respect to the center of the tape winding due to the accuracy of the tape running path, the characteristics of the running path, etc., the eccentric direction of the upper flange 69 is wound. The shaft 67 may be fixed so as to be shifted by a predetermined amount from the center of the shaft 67.

The other embodiment shown in FIG. 8 is different from the embodiment shown in FIG. 6 in that an adjusting mechanism for adjusting the inclination of the upper flange is further provided. The structure and function of the adjusting mechanism are the same as those described in the other embodiments. According to this embodiment, it is possible to easily prevent the tape from being deformed due to variations in the apparatus such as the accuracy of the tape running path, and to minimize the tape regulating force. In the embodiment shown in FIGS. 6 and 8, the amount of eccentricity of the upper flange 69 with respect to the shaft 67 and the shape of the conical surface that regulates the tape height of the upper flange 69 are selected to predetermined values. If the height of the flange surface shown in FIG. 10 is changed, any change can be made. Therefore, the winding angle around the tape guide, the thickness of the tape,
The deformation of the tape end can be prevented in accordance with an arbitrary regulation state of the tape end determined by the diameter of the tape tension guide roller and the like.

〔The invention's effect〕

As described above, according to the present invention, since the inclination of the upper flange of the tape guide can be adjusted, the deformation of the tape can be prevented irrespective of variations in the tape running path. In addition, since excessive restricting force is not given unnecessarily, damage to the tape end can be prevented. Furthermore, since the tape guide can be of a rotary type, the running load of the tape can be reduced, and the reliability of the running of the tape can be improved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a tape guide according to an embodiment of the present invention, FIG. 2 is a plan view of the entire apparatus, showing a tape unloading state, FIG. 3 shows the same tape loading state, and FIG. Partial sectional view of the tape guide of the embodiment of
FIGS. 5, 6, and 8 are also partially sectional views of the tape guide, FIG. 7 is a partially enlarged view of FIG. 6, and FIG.
FIGS. 4 and 5 show changes in flange height in the embodiment according to FIGS. 5 and 6. FIG. 10 shows changes in flange height in the embodiment according to FIGS. 6 and 8. 51 ... shaft, 53 ... bearing, 54 ... roller, 57 ... sleeve, 55 ... upper flange, 58 ... adjustment base, 59 ...
Adjustment screw, 61 ... Shaft, 64 ... Adjustment base, 69 ...
Upper flange, 70 ... Adjustment base, 67 ... Shaft.

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Takashi Sasaki 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances Research Laboratory, Hitachi, Ltd. (56) References JP-A-1-227250 (JP, A) 60-12840 (JP, U)

Claims (2)

(57) [Claims] 1. A shaft (51, 61) for supporting a tape guide; a tape guide (54, 62, 65) for guiding a tape (6) concentrically with the shaft (51, 61); (6) a flange (55) having a regulating surface for regulating the traveling height, and a height of the flange (55) from a direction opposite to the traveling height regulating surface of the tape (6) of the flange (55). The guide member (59) has a plurality of height adjusting portions for determining the height of the flange (55), and the regulating surface is positioned with respect to an axis. A tape guide for a magnetic recording / reproducing apparatus, characterized in that the tape guide is configured to be inclined. 2. A shaft (67) for supporting the tape guide, a tape guide (54) for guiding the tape (6) concentrically with the shaft (67), and a running height of the tape (6). A flange (69) having a regulating surface for regulating the tape, wherein the surface of the flange (69) for regulating the running height of the tape has a conical shape with respect to the shaft (67); A tape guide for a magnetic recording / reproducing apparatus, wherein the center of the conical shape of the flange (69) is held in a positional relationship eccentric to the center of the shaft (67) by a predetermined amount.