KR850002764Y1 - Tape guide system - Google Patents

Abstract

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Description

Tape Guide System

1 is a plan view of a cassette.

FIG. 2 is an enlarged cross-sectional view of the guide surface of the tape guide taken along the line II-II of FIG. 1 with a parallelogram groove.

3 is a cross-sectional view having a rectangular groove.

4 is a cross-sectional view having a circular groove.

5 is a cross-sectional view having a triangular groove.

6 is a partial view of a cassette consisting of a cylindrical tape guide having a ball-shaped cross section.

7 is a tape guide configured to allow a tape guide record carrier to pass along a spiral track.

The present invention relates to a tape guide system for a record carrier in the form of a tape passing through the guide surface thereof, and to a tape guide disposed in a cassette for a record carrier. Such tape guides are known in various variants. The guide surface of such a tape guide may be circular-cylindrical or conical and may be constituted by differently curved surfaces. In addition, such a tape guide may be constituted by a fixed portion and a rotatable roll. Examples of these are described in Federal Republic of Germany 23 25 069 and Austrian Patent No. 290,159. As described in Austrian Patent No. 290,159, such tapeguides are arranged in a cassette containing a record carrier or outside the cassette on a recording and playback device in the record carrier passage. As is known, such tape guides must be in accordance with special requirements. In other words, they must ensure that the record carrier can move uniformly across the guide surface without any unexpected unevenness that may occur when the record carrier contacts the guide surface. It is equally important that the direction of travel of the record carrier should not be obstructed so that the record carriers leaving the tape guides are accurately transported to the position where they will interact with after the tape guides. The next position to be interacted with may be, for example, a magnetic head, a hub or tape reel or tape guide. When the tape guide is placed inside the cassette, it is very important that the above requirement be satisfied. In particular, in order to prevent the record carrier edges from adhering to the cassette's boundary wall, which may be the case when the tape roll is irregular, uniform feeding and ejection of the record carrier from or to the winding hub in the cassette is very important. It is important. Above all, in satisfactorily supporting the tape, the friction between the record carrier and the guide surface of the tape is of utmost importance.

It is an object of the present invention to configure a tape guide of the above type so that a maximum uniform record carrier movement and a maximum uniform record carrier path are obtained. The present invention for this purpose is formed of a plurality of coupling grooves having a boundary on the outer circumferential surface and arranged in the form of a guide surface, a ridge is formed between adjacent grooves forming a series of coupling Should be. Therefore, the area where friction between the record carrier and the tape guide surface occurs is reduced because the record carrier only comes in contact with the ridges, so that a more uniform record carrier movement can be obtained. Since the ridges constitute a series of couplings, when the record carrier moves on the guide plane, the record carrier is continuously supported in a uniform manner irrespective of the groove, and the guide plane due to the carrier movement provides a very satisfactory effect.

In this respect, the friction during the interaction of the record carrier with the tape guide disposed outside the cassette can be improved by the specific design of the guide surface. This relates to relatively large diameter tape guide drums for use in magnetic video tape equipment. By way of example, according to the Federal Republic of Germany 19 35 524, a corrugatron is formed in the guide surface of the tape guide drum, and inclined grooves are formed in the guide surface according to the Federal Republic of Germany 19 08 508. The grooves formed at are continuous channels extending into the area of the guide surface through which the record carrier does not pass. In this case, although the area of the guide surface causing friction with the record carrier is reduced, the friction is reduced mainly due to the formation of an air cushion that transports the record carrier under the record carrier by injecting air into the channel openly known. Will be. As can be seen, the shape of such valleys of the grooves is different from the laterally blocked grooves formed according to the present invention, primarily with respect to their shape), the grooves of the present invention having a ridge forming a series of bonds. By being separated from each other, the guide surface is uniform without valleys, and continuous guidance and support for the record carrier is obtained.

It has been found that the ridges of the tape guide according to the present invention are advantageous when they reach the shape of polygonal diamond. In this way, it was found that a very uniform structure of the guide surface is obtained, and thus a very uniform record carrier movement occurs. In this respect, it has been found to be more advantageous if diamond ridges make an angle smaller than 45 degrees perpendicular to the lateral direction of the tape-like record carrier. By arranging the ridges transversely in the record-carrier direction of movement according to this method, the record carrier is supported by the ridges in an advantageous manner.

Among various experiments, a particularly preferred result is that the grooves have a depth of 10 to 50 μm, the ridges have a width of 150 to 250 μm, and the distance between adjacent ridges has a size of 250 μm to 350 μm Obtained in the example. With regard to the shape of the grooves, there is a slight deformation without departing from the scope of the invention, and there is a slight tolerance to the pattern and shape of the ridges. In order to obtain satisfactory guiding properties, it has been found to be particularly advantageous if the grooves have transverse parallelogram-shaped cross sections in their depth direction. As a result, the grooves can have a relatively large area, nevertheless a dense combination of uniform and widely arranged ridges is obtained. Therefore, the guide surface area that determines the friction with the record carrier is effectively reduced, and the combination of the ridges thus formed ensures accurate guidance and support of the record carrier without the occurrence of an attachment action.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 shows a cassette of a tape-shaped record carrier, which passes through two cylindrical tape guides in the cassette. FIG. 2 is an enlarged cross-sectional view taken along line 3 II-II of FIG. 1, wherein the guide shows grooves formed in the form of parallelograms in the guide surface. 3 shows the shape of a rectangular groove. FIG. 4 shows a portion of a cassette provided with a cylindrical tape guide in the form of grooves in a circular transverse plane, in FIG. 5 in the form of grooves in a triangular cross section, and in FIG. 6. 7 shows a tape guide disposed outside the cassette on the recording and reproducing apparatus, on which the record carrier passes along a spiral passage.

In Figure 1 it is represented as a cassette (1), which holds a tape-shaped record carrier (2), for example a magnetic tape extending between two reels (3) (4) acting as feed and take-up reels. do. The cassette 1 comprises two circular-cylindrical tape guides 5, 6, through which the record carrier passes between two reels 3, 4 so that the holes 7 It extends along the narrow side of the formed cassette. This hole 7 is used to remove the record carrier from the cassette placed in the recording and reproducing apparatus in order to be able to interact with a recording and reproducing apparatus portion such as a magnetic head, a drive or a tape guide. However, the parts on the device are inserted into the cassette through the holes 7 and make contact with the record carrier.

2 shows a tape guide 5, which is shown in more detail in the same configuration as the tape guide 6. It comprises a circular-cylindrical guide portion 8, which face constitutes the guide face of the record carrier 2. The guide portion 8 is provided with two flanges 9, 10 for side guidance of the record carrier, each of which is connected to the cylindrical projections 11, 12, respectively. The protrusions 11 and 12 extend into the holes 13 and 14, respectively, which are formed in one on the major surfaces 15 and 16 of the cassette. In this way the position of the tape guide inside the cassette is determined. The tape guide 5 can act like a rotatable roller, which is anisotropic along with the record carrier 2. However, in the case of acting as a fixed tape guide, when the cassette is placed in the recording and reproducing apparatus, the transfer of the record carrier 2 is because the pin on the apparatus is in contact with the axial hole 17 formed in the guide portion 8. The tape guide is prevented from rotating during the process.

In the guide surface of the guide portion 8 of the tape guide 5, a plurality of coupled grooves bounded on the outer circumferential surface are arranged in a circulating shape, and ridges forming a series of couplings are formed between adjacent grooves. 2 schematically shows the shape of the grooves 19 in the circle 18. Ridges formed between adjacent grooves 19 are shown by dashed lines 20, 21 outside the circle 18. In this embodiment, the grooves have a cross section which is parallelogram-shaped in their longitudinal transverse direction, which cross section is a lozenge in this case. By arranging the grooves in a circular form, two sets of ridges are formed between adjacent grooves, which form a polygonal diamond and in this case 30 degrees with respect to the vertical part 22 in the axial direction of the record carrier 2. Are placed at an angle. Because the grooves themselves are limited in circumference, the ridges between them constitute a series of bonds.

By providing such a groove 19, the area determining the friction between the guide carrier of the record carrier 2 and the tape guide 5 is significantly reduced compared to the smooth guide surface without grooves, and constitutes a series of couplings. Ritches 20 and 21 ensure that the record carrier 2 is supported and guided uniformly and continuously throughout the guide surface. In this way a tape guide is obtained, which ensures uniform record carrier movement without generating the attachment action and thus the uneven record carrier movement. Since the ridges 20, 21 form a polygonal diamond shape and they form an angle smaller than 45 degrees with the vertical portion 22 in the axial direction of the record carrier 2, that is, the axis of the record carrier 2. Since it extends in the transverse direction of the direction, the record carrier is supported very uniformly with low frictional force, so that the desirable guide characteristic of the tape guide is obtained. The polygonal diamond shape of the ridges 20, 21 can of course be rotated by 90 degrees or even smaller, in which case the ridges extend in the axial direction of the record carrier. In particular, it is particularly preferred if the depth of the grooves is 10 to 50 μm, the width of the ridges is 150 to 250 μm, and the distance between adjacent ridges is 250 to 350 μm, in the case of magnetic tape, the tape guide is a good guide Provide properties.

Forming such a shape of the grooves on the guide surface of the tape guide can be accomplished in a number of ways and relatively simple. If such a tape guide is generally made of, for example, an injection molding process, and if it is formed of plastic, the grooves can be formed directly in the manufacture of the tape guide. If necessary, such plastic tape guides can be formed from a metal layer by electroplating. If the tape guide consists of metal parts, the grooves in the tape guide can be formed by etching. If the grooves on the guide surface are formed by a properly formed embossed tool, it is very simple for the tape guide to be wound on the tool or the tool to be wound on the tape guide.

Although the rhombus shape of the grooves has been found to be very beneficial, there are several other possible forms of the shape of the grooves. 3 and 4 and 5 show three examples of this. The shape of the grooves is schematically represented by a circle again. In FIG. 3, the grooves 119 have a rectangular cross section in their depth direction, and the directions of the ridges forming a series of couplings are shown by dashed lines 120 and 121 outside the circle 118.

In this embodiment, the direction of the ridges 120, 121 is selected so that one set of ridges 120 extends transversely in the axial direction and the other set of ridges 121 extends in the axial direction of the record carrier. The direction of the two sets of ridges can have an angle of 45 degrees with respect to the axial direction of the record carrier Similarly, the grooves can be of rectangular cross section.

In the embodiment of FIG. 4, the grooves 219 are of circular cross section transverse to their depth direction. The grooves 219 have a cylindrical shape or a hole shape. The shape of the grooves is selected so that the ridges forming the series coupling extend in the three directions shown by dashed lines 220, 221, 223. The two ridges 220, 221 form a diamond shape that extends generally transversely in the axial direction of the record carrier, while the third set of ridges indicated by reference numeral 223 is in the axial direction of the record carrier. Is extended. This is the result of very good performance of the tape guide. Moreover, the shape of the groove 219 is selected such that the ridge does not extend completely linearly but undulates between adjacent grooves.

The grooves 319 shown in FIG. 5 have triangular cross sections in the horizontal direction of their depth. Suitably, this cross section takes the form of an isosceles triangle, so that the grooves 319 can be rearranged in the form of three sets of ridges 320, 321, 323, each 60 for each other. And 120 Very good performance of the tape guide is obtained by extending at the angle of. Because it supports the record carrier in a very uniform way.

Obviously, the shape of the grooves is not limited to the geometry, but any cross section can be selected, in which case the ridges are no longer extending along a straight line, but can constitute an arbitrarily formed series of bonds. The grooves can have a cross section, for example droplets or kidneys.

Moreover, the guide surfaces formed as described above are suitable for various applications in the form of tape guides. Such tape guides need not be circular-cylindrical. Other cylinders that may be perpendicular or inclined may have any arbitrary cross. Such a tape guide is shown in FIG. It relates to a tape guide disposed in the cassette 401, in which only one part of the cassette is shown. The illustrated cylindrical tape guide 424 is a kidney-shaped cross section, and the guide surface of the record carrier 402 is constituted by the tape guide convex surface. Again this guide surface may be formed in the form of a groove as described above.

Although the structure of the guide face of the tape guide according to the invention has been found to be particularly suitable for tape guides arranged in the cassette, in such tape guides the friction between the tape guide and the record carrier is minimized and the record carrier movement Since it is important to be as uniform and smooth as possible, it is also desirable to apply the steps according to the invention to tape guides which are placed directly on the recording and reproducing apparatus and which serve to guide the record carriers on the apparatus. 7 shows a corresponding embodiment. An inclined circular-cylindrical tape guide 526 is disposed in the chassis 525, the circumferential surface acting as a guide surface of the record carrier wound around the guide circumference along the helical passageway. Such a tape guide allows for example to switch elements, i.e. act as a guide drum, the adjacent rotatable magnetic head being provided to interact with the record carrier. Circle 518 is formed in the form of a circulating groove each of the guide surface of the tape guide has a boundary on the outer circumferential surface, and again outlines that the ridges extending between the grooves to form a series of coupling.

Claims (1)

In the tape guides (5) and (6) having a guide surface through which the tape-shaped record carrier (2) passes, the guide surface is formed in a series of ridges (20) and (21) in combination, and the ridges are circulated. Tape guide system, characterized in that the boundary of the plurality of coupling grooves 19 formed on the outer circumferential surface arranged as.