JPS6134760A - Magnetic tape controller of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent floating of a tape on a drum part and to run the thin tape stably by attaching a turning member, to which a pad is adhered, to a lower fixed drum and engaging the turning member with a loading ring to press the pad to the surface of the tape. CONSTITUTION:An upper turning arm 42 to which a pad 46 is adhered and a lower turning arm 43 are supported turnably on a supporting shaft 44 of a lower fixed drum 17. The lower turning arm 43 is so provided that it can be engaged with a groove of a guide groove plate 36 of a loading ring 31. When the loading ring 31 is rotated in the direction of an arrow A, the lower turning arm 43 is engaged with the groove plate 36 and is moved outward, and the upper turning arm 42 is turned in the direction of an arrow B, and the pad 46 is pressed to the tape. Thus, floating in the breadthwise direction of the tape is prevented in the drum part, and even the thin tape is run stably and surely.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic tape regulating device for a magnetic recording/reproducing device, and a regulating device suitable for regulating widthwise fluctuations of a magnetic tape wound around a drum. Regarding equipment.

[Background of the invention]

Conventional examples will be explained with respect to problems in magnetic tape regulations in the top-rotating drum type magnetic recording/reproducing device and the medium-rotating drum type Niga type. First of all, the upper rotating drum system will be explained using FIGS. 1, 2, 3, 4, and 6 and 7.

FIG. 1 shows a schematic plan view of a magnetic recording/reproducing device. 1 is a one-rotation drum (the fixed drum will be described later).
, 2 is a guide post, 6 is a guide a-ra, 4 is an impedance roller, 5 is an erasing head, 6 is a tension pin (the rotatable arm on which the tension pin is mounted is not shown) ), 7 is an audio and control head, 8 is a capstan, 9 is a pinch roller, 1o is a supply reel stand, 11 is a take-up reel stand, 12 is a supply reel, 15 is a take-up reel,
14 is a cassette case, 15 is a magnetic tape (hereinafter referred to as
Make it a tape. ).

The tape 15 wound around the supply reel 12 includes a tension 1 pin 6, an erasing head 5, an impedance roller 4,
It contacts the guide ruler 3, guide post 2, rotating drum 1, and audio control head 7, and is driven by a capstan 8 and a pinch roller 9 in the direction of arrow (A).

The rotating drum 1 is equipped with a plurality of video heads (described later), and rotates in the direction of the arrow (b) in FIG.
Performs magnetic recording and playback.

In the figures following FIG. 2, parts corresponding to those in FIG. 1 are given the same reference numerals.

FIG. 2 is a partial view of the vicinity of the drum section in the magnetic recording/reproducing apparatus shown in FIG.

That is, it is a diagram showing a state in which the tape is wound around the drum part by the tape guide members (guide post 2, guide ruler 3).

In the guide roller 3, 3-a is a fixed upper flange;
5-b is a gastrointestinal ray, 6-C is a fixed lower 7 lunge, 16 is a video head, 17 is a fixed drum, and 18 is a tape guide lead.

The lower end of the tape 15 is attached to the fixed drum 17 or
The tape 15 runs while contacting and being guided by the guide steps 8.

The video head 16 helically scans the tape 15 in the (b) direction. In order to ensure higher precision scanning of the video head 16, by displacing the guide roller in the (c) direction with respect to the tape 15, the tape
5 is pressed against the guide step of the tape guide lead 18 for regulation. FIG. 3 shows the force acting on the tape 15 by the video head 16. That is, a force Fo is applied to the tape 15 by the video head 16, and this is because a component force F1 acts in the tape width direction, and as a result, the tape 15 due to the component force F1 is A phenomenon occurs in which the lead 18 floats above the lead 18.

FIG. 4 is a diagram showing tape lifting in the drum-wound state caused by the component force F1 explained in FIG. 3. As mentioned above, the tape rises at 4 on the drum exit side. This lifting causes problems in the following two points. One is the fixed upper flange 5- on the exit side of the guide ruler 3.
'a□' and tape damage due to tape deformation at the upper end of the tape. The other problem is video/output degradation due to mistracking of the video track.

This will be explained using FIG.

FIG. 5 shows A and B with different azimuths for the tape 15.
This figure shows the track pattern recorded from the two heads. Here, we will consider compatible playback using the B head. When the track pattern recorded by the B head on another device is reproduced and scanned in the direction of the arrow with the B head in a raised state on the output side, only the shaded portion can be reproduced as shown in Figure 5, resulting in deterioration of the video output. arise.

(This is because the B head cannot reproduce the track recorded by the A head due to azimuth recording.) Next, in the upper rotating drum system, tape running due to outer circumferential runout caused by assembly accuracy and parts accuracy of the rotating drum. The destabilization of will be explained using FIGS. 6 and 7.

FIG. 6 shows the upper rotating drum 1 mounted eccentrically by e with respect to the rotating shaft 21. As shown in FIG. Such eccentricity e may occur depending on the assembly work conditions.

FIG. 7 shows the behavior of the tape due to the outer periphery of the rotating upper drum 1 caused by such eccentricity. Reference numeral 19 indicates a head base, and 20 indicates a screw for fixing the head base. That is, when the upper rotating drum rotates from the dotted line to the solid line in the figure, the tape 15 lifts up from the step of the guide lead 18. This is because the restraining force of the upper rotating drum 1 to push down the tape 15 onto the guide lead 18 is weakened.

As described above, the problems regarding tape regulations in the top rotating drum system can be summarized as follows.

(1) In the drum section, the tape cannot be regulated directly; it is regulated at the entrance and exit sides of the drum (guiding members such as the guide reeler 3). Tape 15 is lifted up.

(2) In order to prevent (1), there is a method of pressing the tape 15 against the guide lead 18 using the guide roller 3, but low-rigidity tapes such as thin tapes tend to deform at the 7th rung part, resulting in Inability to obtain adequate regulatory power. Further, problems arise in the tape life due to deformation.

(3) Since the accuracy of parts and assembly of the upper rotating drum have a large influence, sufficient consideration must be given to accuracy control.

Next, regarding tape regulations for medium rotation drum system @
This will be explained using FIGS. 8, 9, and 10.

Figure @8 shows a medium-rotation drum device. 22 is an upper rotating drum, 23 is a middle rotating drum, 2
4 is a guide portion, 29 is a drum fixing member, and 60 is a set screw.

Upper fixed drum? 2 and the lower fixed drum 17 are precisely aligned and fixed by a drum fixing member 29 and a set screw 60.

The video head 16 is mounted on a medium-rotating drum 23 that is rotatable in the direction of the arrow. (The rotation of the medium-rotation drum and the installation of the medium-rotation drum are not shown in the figure.) As can be seen from FIG. 8, the tape 15 wound around the drum
is regulated in the width direction by a guide portion 24 mounted on the upper fixed drum 22. (Details will be explained in the 10th episode.) FIG. 9 shows the structure of the guide portion 24. 25 is a guide arm, 26 is a screw panel, 27
is a support plate, and 28 is an identification axis.

The guide arm 25 can rotate smoothly around the fixed shaft 28 as a support shaft. The fixed shaft 2 is press-fitted into the support plate 27, and the support plate 27 is fixed to the upper fixed drum.

(The fixing method is not shown.) Torsion spring 26
is attached so as to urge the guide arm 25 in the direction of the arrow in the figure.

FIG. 10 is a partial sectional view showing the effect of the tape regulating means. The tape 15 is pressed in the direction of the arrow by the guide plate 25 and follows the stepped portion of the guide lead 18 .

Next, we will explain the problems with this regulatory law. Pressing the tape 15 with the guide plate 25 poses a problem, especially with thin tapes having low tape rigidity. That is, the force of the torsion panel 26 must be weakened, and as a result, the allowable range of variations in the force of the torsion spring 26 becomes narrow, making it extremely difficult to adjust the force of the spring. Furthermore, the widthwise dimension of the guide plate must also be strictly controlled.

According to this regulation law, the phenomenon of tape lifting is suppressed because the tape is controlled directly at the drum section.
The contact area between the fixed drum part (upper fixed drum, lower fixed drum) and the tape is large, and the tape tension increases at the drum part, making it unsuitable for stable running of thin tape with a high coefficient of friction.

As a method of reducing fluctuations in the tape width direction around the cylinder of a magnetic recording/reproducing device, for example, as shown in Utility Model Application No. 58-2762, in a fixed upper cylinder system, a tape regulating member is attached to the fixed upper cylinder, and the tape is There is a method to restrict the upper end, but this is not suitable for thin tapes because it causes deformation of the tape. In addition, for low-load tape running and multi-wrap tape systems, there is a tendency to adopt a rotating upper cylinder system because the rotating upper cylinder system is preferable to the fixed upper cylinder system in terms of running performance, but the current situation is that no optimal regulatory law has been found. It is.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to reduce the widthwise lifting of the tape drum portion and its fluctuation, and to provide an inexpensive and easy-to-operate method for stable running of thin tape. An object of the present invention is to provide a reliable tape regulating device for a magnetic recording/reproducing device.

[Summary of the invention]

In order to achieve the above object, the present invention has a rotating support shaft on the outer peripheral surface of a fixed lower drum, a pad at the tip of the rotating arm, and the pad is attached to the base surface of the tape wound around the drum. The structure is such that it can be pressed from Further, the rotating arm is engaged with the tape seeding means, and has a structure in which the butt presses the tape at the end of the tape loading operation, and a structure in which the pad separates from the tape at the start of the stapling and tape unloading operations. The points are distinctive.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 11 to 18.

First, in explaining this embodiment, the explanation will be given in the following order.

(D) Description of the tape seeding means that can rotate the tape regulating device of the present invention.

(2) Explanation of the tape regulating device provided in the drum section 0 (3) Explanation of the tape regulating operation.

FIG. 11 shows a schematic diagram of a tape running system showing one example of this embodiment.

(Since the present invention relates to a tape regulating device in a drum, there is no problem with the tape running system in other embodiments.) In FIGS.
Identical parts corresponding to those in the figure are given the same reference numerals.
As shown in FIG. 11, as a means for winding the tape 15 around the drum rotating in the direction B, a real internal member for moving the guide post 2 and the guide roller 3 in the direction shown in the figure is required. The twelfth figure shows a loading means in a magnetic recording and reproducing apparatus, and shows a guide member that guides the tape and a guide member that guides the guide member.

31 is a seeding ring, 32 is a boat, and 33 is a guide member.

The guide post 2 and the guide roller 3 are installed on a boat 62, and the boat 32 is engaged with the loading ring 31. (The engaged state will be explained with reference to FIG. 16.) Each tape guide member is driven by a p-ding ring 31 and guided by a guide member. FIG. 13 shows the drive system during loading. 34 is a compression coil spring for crimping the boat, 35 is a fixing member, 36 is a guide groove plate, 37 is a drive gear, 38 is a guide roller, 39
is a push rod. The aforementioned boat 32 is engaged with a push rod 39 and a compression coil spring 34. The push rod 39 is attached to the fixing member 3
5 and 1 pusher 39 is structured to be freely rotatable. The fixing member 35 is fixed to the loading ring 31. The guide groove plate 36 is screwed to the loading ring 31. (Details will be described later.) Loading ring 3
1 is guided by guide rollers and is rotatable in the direction of the arrow in the figure. The p-ding ring 31 is connected to a loading motor (not shown) via a plurality of reduction gears (one reduction gear is shown in FIG. 13). It engages and rotates.

FIG. 14 shows a detailed view of the guide groove plate. 3
9 is a compression plate spring, and 4o is a set screw 141, which is a compression plate spring set screw. The guide groove plate 36 has a hole 36-a.
Attach the two setscrews 4 to the loading ring 31 through the
Fixed at 0. The compression plate 69 is fixed to the guide groove plate 66 with a set screw 41.

Next, the tape regulating device provided in the drum portion in item (2) will be explained.

FIG. 15 shows an assembly diagram of the tape regulating device according to the present invention. 42 is an upper moving arm, 43 is a lower moving arm, 44 is a support shaft having a spherical shape at the tip, 45 is
Fixing member 46 is a pad, 47 is a set screw, 42-
43 a is a hemispherical hole drilled in the upper moving arm 42;
-a is a hole dug in the lower moving arm 43, 42-b is,
Hole, 43-b is a guide part, 43-c is a projection for a spring hook, 48, 49 are a stopper, 50 is a spring stopper, 51 is a spring0 Pad 46 has a low coefficient of friction The material is selected and bonded to the upper moving arm 42.

The upper moving arm 42 and the lower moving arm 43 are connected to the tip of the support shaft 44 by a hemispherical hole 42-a provided in the upper moving arm 42 and a hemispherical hole 45-a provided in the upper moving arm 46. The spherical part of the part is sandwiched between the parts, and the parts are joined together through the hole 42-b with a set screw 47. (The threaded portion provided on the upper movable arm 43 is not shown.) The support shaft 44 is press-fitted into a fixed member 45, and the fixed member 45 is fixed to the lower fixed drum. (The fixing method is not shown.) The stoppers 48, 49 are press-fitted into the lower fixing drum 17.

The spring hook is attached to the protrusion 43-c and the spring stopper pin 5o.
A spring 51 is applied, and the vertical movement arm 42.43
is biased in the D direction. The upper moving arm 43 is engaged with the north stopper and is positioned.

Next, when the loading operation starts, the loading ring 31 rotates in the inward direction, and just before the loading is completed, the groove part of the guide groove plate 36 and the guide part 43 of the upper moving arm 43
b starts engagement.

When engaged in section (A) of the groove portion of the guide groove plate 56, the upper moving arm 42 rotates in the O direction and also rotates in the B direction. Next, pass the (a) section and leaf spring 3
9 and the guide portion 43-b, the upper moving arm 42 and the upper moving arm 43 are completely rotated in the O direction in the (b) section due to the reaction force of the leaf spring 39, and are engaged with the stopper 49. position.

Furthermore, errors caused by variations in the position of the guide groove plate 56, variations in the position of the support shaft 44, and component precision are absorbed by the deflection section of the leaf spring (→), so there is no risk of damage to the rotating arm. Further, since the groove width 11 of the guide groove plate 36 is equal to the width 12 of the guide portion 46-b, the upper movable arm 42 can rotate in the B direction.

Next, the tape regulation method will be explained using FIGS. 17 and 18.

FIG. 17 shows the tape regulating device at the start of loading. The rotating arm (the upper moving arm and the upper moving arm are collectively referred to as the rotating arm) is biased by a spring 51 and positioned by the stopper 48. FIG. 18 shows the state after loading is completed, that is, the tape 15 is mounted on the drum.

The rotating arm is rotated in the direction of the arrow by the guide groove plate 36.
It engages with the stopper 51.

The tape 15 is pressed against the tape base surface by the pad 46, and the tape is restrained from being restricted in the width direction. [Effects of the Invention] The present invention has the following effects.

In a top-rotating drum type magnetic recording and reproducing apparatus that is optimal for the running load of tape running, the tape is directly pressed at the drum exit, so tape lifting can be suppressed.

Further, since the present tape regulating device is driven by the loading means, its operation is reliable.

Thin metal tapes and thin vapor-deposited tapes have a high coefficient of friction and low rigidity, so the key point in their design is to reduce the number of fixed posts that slide on the tape.

For example, as shown in FIG. 19 and 20tm, if the number of fixed posts is reduced or the wrapping angle around the posts is reduced, the tape load will be reduced, but the tape regulating force at the drum portion will also be reduced.

Therefore, according to the present invention, stable tape regulation can be expected without significantly increasing the tape running load.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magnetic recording and reproducing device. FIG. 2 is a perspective view of the magnetic recording/reproducing device. FIG. 3 is a schematic diagram showing the acting force of the video head on the tape. FIG. 4 is a perspective view of the magnetic recording/reproducing device. FIG. 5 is a schematic diagram showing video tracks recorded on tape. FIG. 6 is a perspective view of the drum section. FIG. 7 is a sectional view of the drum section and the tape wrapped around the drum. FIG. 8 is a perspective view of the drum section. FIG. 9 is a perspective view of the tape regulating device. FIG. 10 shows a drum section equipped with a tape regulating device and a cross section IN of the tape wrapped around the drum. FIG. 11 is a plan view of the magnetic recording/reproducing device. FIG. 12 is a perspective view of the tape loading means. FIG. 16 is a perspective view of the tape loading means. FIG. 14 is a perspective view of the drive means of the tape regulating device. FIG. 15 is an assembled diagram of the tape regulating device. FIG. 16 is a perspective view of the tape regulating device. FIG. 17 is a perspective view of the drum section. FIG. 18 is a perspective view of the drum section. FIG. 19 is a schematic plan view of the magnetic recording/reproducing device. FIG. 20 is a schematic plan view of the magnetic recording/reproducing device. 39... Compression plate spring 40... Set screw 41... Compression plate spring set screw 42... Upper moving arm 43... Upper moving arm 44... Support shaft 45...・Fixing member 46...Pad 47...Set screw 48.49...Stopper 50...Spring stopper bottle 51...Spring cap 1 Figure 2 Figure 4 Figure 8 Z'1 Figure Rod l 1 Mouth 72nd 13th Figure Ginzu Collection 1s Figure 1 & Figure 77 Figure 18 Figure 1? 20 drawing rods

Claims (1)

[Claims] In a magnetic recording and reproducing device comprising a rotating drum having a plurality of video heads and a fixed drum having a stage for guiding a magnetic tape, and having a magnetic tape winding means for winding the magnetic tape around the rotating and fixed drum for more than half a turn. , a magnetic tape comprising a rotating member and a friction material adhered to the rotating member at a predetermined position on the circumferential surface of a fixed drum, the rotating member being driven by a magnetic tape winding means and wound around the drum; 1. A magnetic tape regulating device for a magnetic recording/reproducing device, characterized in that the friction material is brought into contact with a constant pressing force.