JPH0619183U - Magnetic tape guide for tape cassette - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a magnetic tape guide for a tape cassette which can reduce the material cost by reducing the plate thickness without impairing the rigidity. A pair of tape reels in which both ends of a magnetic tape are fastened and wound, a cassette case for rotatably supporting the pair of tape reels, and both end sides of a front surface portion of the cassette case are provided. In a tape cassette provided with a pair of magnetic tape guides that are fixedly provided and guide a part of the magnetic tape along the front surface of the cassette case, the magnetic tape guides 16 are made of a plate member 18 made of a non-magnetic material. Is used to form a substantially cylindrical shape, and the reduced diameter portions 22 are formed at both ends thereof.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is a magnetic tape guide (hereinafter referred to as "tape guide") used to guide a part of a magnetic tape from a pair of tape reels to the front surface of the cassette case in a cassette case used for a video tape or the like. Related to improvements in shape and structure.

[0002]

[Prior art and its problems]

 This kind of tape guide is provided in a state where a magnetic tape is wound around a part of its outer peripheral surface, and the magnetic tape is guided by the tape guide by sliding smoothly on the outer peripheral surface of the tape guide. It has become.

Conventionally, as this type of tape guide, as shown in FIG. 5, a magnetic steel sheet 2 made of stainless steel, brass or the like is formed in a cylindrical shape, or V-shapes are formed at both ends of a joint portion 4. There is a cut portion 6 having a shape as shown in FIG.

In the conventional tape guide as described above, the rigidity thereof depends on the plate thickness, and thus it cannot be made thinner than a certain thickness, but it is made thinner to reduce the material cost. Was desired. Also, since both ends of the tape guide are fixed and supported by the cassette case, the shape of the supporting part (the part supporting the end of the tape guide) on the cassette case side is determined according to the shape of both ends. There was a need for a tape guide that could change the shape of this support according to the cassette design and other factors. The present invention is intended to solve the above problems.

[0005]

[Means for Solving the Problems]

 The present invention is directed to a pair of tape reels having both ends of a magnetic tape fastened and wound, a cassette case for rotatably supporting the pair of tape reels, and both end sides of the front face portion of the cassette case. A tape cassette of a tape cassette comprising a pair of tape guides, each of which is fixedly provided to guide a part of the magnetic tape along the front surface of the cassette case, and is a substantially cylindrical shape using a plate member. It is characterized in that it is formed in a circular shape, and the reduced diameter portions are formed at both ends thereof.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, with reference to FIG. 3, a schematic configuration of a tape cassette in which a tape guide is mounted will be described.

In the figure, reference numeral 8 is a cassette case having a substantially rectangular parallelepiped shape, which is composed of two upper and lower cassette halves. Inside the cassette case 8, a pair of tape reels 10 are spaced apart from each other by a predetermined distance and are supported rotatably around respective axes. A magnetic tape 12 having one end and the other end fastened to each tape reel 10 is wound around these tape reels 10, 10.

On the other hand, on the front surface portion 8a of the cassette case 8 in which the tape outlets 14 and 14 are formed, a pair of tape guides 16 and 16 are provided on both end sides in the width direction of the cassette case 8 so that the axis is aligned with the cassette case It is fixed and provided in the thickness direction (direction perpendicular to the paper surface). These tape guides 16 and 16 are formed by forming a plate member into a substantially cylindrical shape, as will be described later, and their joints are located at substantially the center side of the cassette case 8 (at the point P in FIG. 3). The upper and lower end portions are fixedly held by the cassette case 8 in a state of directing the direction.

A part of the magnetic tape 12 wound around the tape reels 10, 10 is wound around a part of the outer circumference of the tape guides 16, 16 and extends from the tape outlets 14, 14 along the front surface of the cassette case 8. Information is written to and read from the magnetic tape 12.

An opening / closing lid (not shown) is provided on the front surface 8a of the cassette case 8 to protect a part of the magnetic tape 12 exposed on the front surface of the cassette case 8 when the tape cassette is not used. Consideration is given.

Next, the shape and structure of the tape guide 16 according to this embodiment will be described with reference to FIGS. 1 and 2.

The tape guide 16 according to the present embodiment is made of a non-magnetic steel plate (plate member) 18 made of stainless steel, brass, aluminum or the like, which is formed into a substantially cylindrical shape by pressing or multiforming as shown in the figure. The straight body portion 20 is formed over a length L1 larger than the width of the magnetic tape 12 in the central portion thereof, and the reduced diameter portion 22 is formed over the length L2 at both ends thereof. Are formed respectively.

The one end side and the other end side of the non-magnetic steel plate 18 are in contact with each other without a gap, and the joint portion 24 extends linearly along the axial direction. Substantially rectangular notches 26 and 26 are formed at the upper and lower ends of the seam portion 24.

The outer peripheral surface 20a of the straight body portion 20 is used as a tape running surface, and is polished to a required accuracy in order to satisfy the required surface roughness.

According to the tape guide having the above-described configuration, the reduced diameter portions 22 and 22 formed at both ends of the straight body portion 20 improve the rigidity (mainly bending rigidity) of the tape guide. It is possible to reduce the plate thickness t of the conventional type and reduce the material cost required for manufacturing the tape guide 16.

Further, by changing the shape of the reduced diameter portion, it is possible to change the dimension of the reduced diameter portion inner diameter D1, and the cassette case 8 side which fixes and supports both ends of the tape guide 16 is provided. It is possible to deal with a change in the shape of the support portion.

Further, the tape guide 16 can be manufactured by pressing or multi-forming, and the shape of the notch 26 can be changed into various shapes, and the tape guide 16 can be easily attached to the tape cassette. For example, the shape of the notch 26 may be V-shaped as shown in FIG.

[0018]

[Effect of device]

 As described above, according to the tape guide of the present invention, the tape guide is formed in the substantially cylindrical shape using the plate member, and the reduced diameter portions are formed at both ends thereof, so that it is formed at both end portions. The reduced diameter portion improves the rigidity of the tape guide (mainly bending rigidity), which makes it possible to reduce the plate thickness of the plate member and reduce the material cost required to manufacture the tape guide. Become.

Further, by changing the shape of the reduced diameter portion, it is possible to deal with the change of the shape of the supporting portion on the side of the cassette case that fixedly supports both ends of the tape guide.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a perspective view showing a tape guide according to an embodiment of the present invention.

FIG. 3 is a horizontal cross-sectional view showing a state where the tape guide is attached to the cassette case.

FIG. 4 is a perspective view showing a tape guide according to another embodiment of the present invention.

FIG. 5 is a perspective view showing an example of a conventional tape guide.

FIG. 6 is a perspective view showing another example of a conventional tape guide.

[Explanation of symbols]

 8 cassette case 10 tape reel 12 magnetic tape 16 tape guide 22 taper reduced diameter part

Claims (1)

[Scope of utility model registration request] 1. A pair of tape reels in which both ends of a magnetic tape are fastened and wound, a cassette case for rotatably supporting the pair of tape reels, and both end sides of a front surface portion of the cassette case. A magnetic tape guide of a tape cassette comprising a pair of magnetic tape guides, each of which is fixedly provided to guide a part of the magnetic tape along the front surface of the cassette case; A magnetic tape guide for a tape cassette, characterized in that the magnetic tape guide is formed in a substantially cylindrical shape and has a reduced diameter portion formed at both ends thereof.