JPH04101983U - tape cassette - Google Patents

Abstract

(57) [Summary] [Purpose] Improve the dimensional accuracy of the position of the prism for detecting the end of the tape, mold it integrally with the case under conditions with good light transmission, and achieve high reliability by ensuring proper hub braking action. It improves quality and simplifies the structure of the molding die, significantly improving productivity. [Configuration] A pair of reel hubs wrapped with tape are rotatably mounted inside the case, a hub brake is slidably provided in the case to regulate the rotation of the reel hub, and a prism for detecting the end of the tape is provided in the outer case. In the tape cassette, the holding piece that slidably supports the hub brake and the prism are integrally molded and placed on the inner surface of the upper case, which improves the dimensional accuracy of the hub engaging part of the window and the position of the prism. The prism molding mold structure can be simplified, the molding cycle can be easily increased, the moldability and prism light transmittance are significantly improved, and the reliability of the hub brake action is improved. This allows for good quality and increased product value.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to magnetic tape cassettes for audio or video, particularly for prism tape cassettes. Regarding tape cassettes (DAT) with optical tape end detection mechanism using It is something that

0002

[Conventional technology]

In conventional DAT, a pair of reel hubs wrapped with magnetic tape are used when not in use. (When stored), its rotation is restricted by a hub brake member. That is, during storage, the magnetic tape is protected by the slider, front cover, and cassette case. The hub brake is sealed, and the hub brake is connected to the front cover via the arm, and the front cover is opened. When the hub brake moves away from the locking part of the reel hub, it slides to the unlocked state. It is usually built in and configured to The hub brake is locked, keeping the reel hub stationary and preventing the magnetic tape from sagging or breaking. There is no damage caused by this, and when in use, the hub brake will come off and rotational operation will be hindered. This method is designed to ensure that there are no errors. With this type of cassette, the hub The rake is supported by a hub brake holding piece provided inside the case, while the tape end It is equipped with a prism for an edge detection mechanism and a window for checking the remaining amount of tape.

0003

[Problem that the idea aims to solve]

However, in the past, the prism, hub brake holding piece, and tape remaining confirmation window were Because they were fixed separately in the case, the hub engaging part of the window for checking the remaining amount of tape and the prism The dimensional accuracy of the position of the window is poor, and there is a gap between the upper case and the window, resulting in a poor appearance. The prism is made of transparent resin and is made of two-color molding that is separate from the opaque case. When forming a mold, the structure of the mold becomes complicated, which increases the cost of mold production. In particular, in the mold, the slide part for forming the window, the window part, the slide part between the prisms, and The structure is complicated as the sliding part of the prism is required, and most of the molds on the movable side are sliding. Because of this, cooling water cannot flow, which lengthens the molding cycle time and reduces productivity. It is difficult to mold the window and prism parts due to burrs and sink marks. Moreover, although it is important for prisms to have good light transmittance, resins, molds, and Dust and other impurities in the molding machine may concentrate and mix in the prism area, reducing light transmission. There were problems such as a decline in quality such as inferiority.

0004 This invention attempts to solve these conventional problems and significantly improves dimensional accuracy. The prism can be easily and easily improved by two-color molding, with a good appearance and no molding defects. It is possible to properly prepare the case and accurately detect the end of the tape. This significantly improves reliability, and also enables stable sliding operation of the hub brake. It improves the braking action and contributes to quality improvement, and it also allows for the simplification of molding molds. It can shorten mold cycle time, increase operating rate, improve productivity, and significantly lower costs. The purpose is to provide tape cassettes.

[0005]

[Means to solve the problem]

This invention consists of a case that rotatably houses a pair of reel hubs wrapped with tape. A freely slidable hub brake for regulating the rotation of the reel hub is provided in the reel hub. In a tape cassette whose case is equipped with a prism for detecting the tape end, The holding piece that slidably supports the hub brake and the prism are integrally molded. This is a tape cassette characterized in that the tape is placed on the inner surface of the upper case.

[0006]

【Example】

An embodiment of the present invention will be explained with reference to FIGS. 1 to 7 using an example of a magnetic tape cassette (DAT). Specifically, a pair of reel hubs 11, 11 on which tape 10 is wound are rotatably stored. A hub brake 15 that regulates the rotation of this reel hub 11 is slid inside the case. In addition to freely installing the It has an exit window 3 and a window 5 for checking the remaining amount of tape. The prism 4 is provided at the corresponding position, and the tape is further formed with a hub brake holding piece 14. The upper case 1 is formed by two-color molding of a primary resin and a secondary resin. One of the primary resin and secondary resin is integrally molded, and one of the primary resin and secondary resin is used for the prism 4 and the hub block. The rake holding piece 14 and the window 5 for checking the remaining amount of tape are made of transparent resin, and the other part is made of non-transparent resin. The retaining piece 14, which is made of transparent resin and slidably supports the hub brake 15, and the brake plate are made of transparent resin. Rhythm 4 is integrally molded, and this is integrally molded on the inner surface of upper case 1 separately from the case. It is deployed as a tape cassette.

The holding pieces 14 and the prism 4 include holding pieces 14 , 14 facing each other on both sides of the approximately inverted U-shaped connecting piece 24 , and holding pieces 14 , 14 facing each other on both front end portions 24 ₁ , 24 ₁ . It is preferable that the prisms 4, 4 are integrally formed facing each other, and the case is configured such that the upper case 1 and the lower case 2 can be combined by screwing them together. A window 5 for checking the remaining amount of tape is provided separately, and a pair of reel hubs 11 wound with magnetic tape 10 are rotatably mounted on hub receiving ribs 6, 6 inside the cassette case. Further, a front cover 7 is pivotally attached to the front opening of the cassette case so that it can be rotated to open and close, and a shutter 8 that opens and closes the opening is slidably mounted on the lower case 2.

[0008] Then, the printer corresponding to the tape end detection window hole 3 provided on the outside of the cassette case. The tape 4 is made of transparent primary resin and is separate from the window 5 for checking the remaining amount of tape in the upper case 1. It is arranged in an upper case 1 made of opaque secondary resin. (Figures 1 to 4). That is, the upper case 1 is integrally molded by two-color molding of a primary resin and a secondary resin, One of the primary side resin and the secondary side resin includes the prism 4 and a window for checking the remaining amount of tape. In the case where part 5 is made of transparent resin and the other part is made of opaque resin, the prism 4 and the window 5 for checking the remaining amount of tape are separated by separate gates and installed in the upper case 1. You can leave it.

[0009] The prism 4 is made of colorless and transparent primary resin, but the upper case For molding in step 1, the selection of whether to use the primary resin or the secondary resin and the case. The coloring or transparency can be appropriately selected and used. Also, the prism 4, hub brake holding piece 14 and tape provided in the upper case 1 The remaining amount confirmation window 5 is made of transparent resin, and the other upper case part is made of opaque or translucent resin. Although it is made of fat, in any case this is to make it easier for prism 4 to maintain straightness. Upper case 1 and prism 4 or upper case 1 and prism 4, or hub brake holding It is preferable to mold the piece 14 and the window 5 for checking the remaining amount of tape at the same time in two colors. In this case, the primary resin and secondary resin may be transparent or opaque. Depending on the mold, you can choose whether to mold the window first or afterwards.

A pair of reel hubs 11, 11 with magnetic tape 10 wound thereon are rotatably mounted inside the cassette case, and tape guiding sheets 13 are placed between the inner surfaces of the cases 1, 2 and the tape 10, respectively. The hub brake 15 which is interposed between the reel hub 11 and disposed in the small diameter portion above the tape winding surface of the reel hub 11 and which restricts the rotation of the hub is biased by the hub brake spring 16 and slides. It has a front cover 7 which is freely attached to the lower case 2 and is rotatably fitted into the cassette case 2 to cover or open the front surface of the cassette according to the rotation. As a magnetic tape cassette equipped with a hub brake 15 that is interlocked to obtain a brake locking force, the hub brake 15 is provided with a pair of parallel claw pieces 15 1 that engage with the locking teeth 12 , and a pair of claw pieces 15 ₁ are arranged in parallel on the front lid 7 . It has a pair of arm parts 15 ₃ with engaging protrusions 15 ₂ that can be engaged and detached, and the engaging protrusions 15 ₂ are engaged with and disengaged from the protrusions 7 ₁ provided on the inner side surface of the front lid 7, so that the arm parts 15 ₃ It is designed to be moved. The hub brake 15 is installed inside the cassette case 1 so as to slide in a direction perpendicular to the rotating shaft inserted into the reel hub ₁₁ . The spring 16 for biasing the hub brake ₁₅ is connected to a support pole on the lower case 2. A torsion spring having a coil portion wound around the hub brake 17 is used, and one end of the torsion spring is connected to a hook-shaped connecting part provided on the hub brake 15, and the other end is connected to one hook-shaped connecting part provided on the hub brake 15. The hub brake 15 is biased so as to generate a locking force. Note that the holding piece 14 for guiding the hub brake 15 is provided on the inner surface of the upper case 1 of the combination case consisting of an upper and lower case, and the holding piece 14 guides the hub brake 15 within the area of the running path of the tape 10. The retaining piece 14 is interposed between the hub brake 15 and the seat 13 to hold the hub brake 15 in contact with the inner surface of the case. They are arranged at both sides of the case 1, or at intervals between these positions and the central position. Further, the hub brake 15 is provided with an L-shaped tongue piece that is fitted into the holding piece 14 and protrudes toward the inside of the case as an engaging part ₁₅₄ , and a pair of L-shaped tongue pieces are provided at intervals on the inner surface of the case. It is effective to form a vertical wall and a horizontal wall perpendicular to one corner of a rectangular hole or a concave surface portion to also serve as a stopper.

[0011] In the figure, 9 is a boss for connecting the case, and 18 is an elastic piece formed on the lower case for the shutter lock. It is used as a piece of wood.

0012 In the embodiment of FIG. 8, a holding piece 14 that slidably supports the hub brake 15; In order to integrally mold the prism, the window 5 for checking the amount of remaining tape can also be integrally molded. This is placed inside the upper case.

[0013]

[Effect of the idea]

This invention is equipped with a slidable hub brake that regulates the rotation of the reel hub, and In a tape cassette whose case is equipped with a prism for detecting the tape end, The holding piece that slidably supports the hub brake and the prism are integrally molded. By placing this on the inner surface of the upper case, the hub engagement part of the window and the position of the prism can be adjusted. The dimensional accuracy is good, and there is no gap between the upper case and the window, resulting in a better appearance. Furthermore, the light transmittance of the prism can be significantly improved, and moldability can also be greatly improved. At the same time, the molding mold can be simplified, workability can be significantly improved, and the case and plate can be The fixed configuration with the rhythm is accurate without variation, and the prism can be positioned accurately. It is easy to maintain the straightness of the tape and can be used without causing malfunction or non-operation in detecting the end of the tape. This makes it possible to create a reliable tape cassette that guarantees stable operation. In addition, it has the effect of significantly shortening the molding cycle and significantly improving productivity. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a plan view showing the inner surface of the upper case.

FIG. 3 is a partial perspective view.

FIG. 4 is a perspective view of the lower case in a separated state.

FIG. 5 is a plan view with a part of the upper case removed when the hub brake is engaged.

FIG. 6 is a plan view of a portion of the hub brake in a detached state, with the upper case removed.

7 is an enlarged longitudinal cross-sectional view taken along line AA in FIG. 5. FIG.

FIG. 8 is a plan view showing the inner surface of the upper case of another embodiment of the present invention.

[Explanation of symbols]

1 Upper case 2 Lower case 3 Tape end detection window 4 Prism 5 Window for checking remaining tape amount 6 Hub receiving rib 7 Front lid 8 Shutter 9 Boss 10 Tape 11 Reel hub 12 Locking teeth 13 Seat 14 Hub brake retaining piece 15 Hub Brake 15 ₁ Claw piece 15 ₂ Engagement protrusion 15 ₃ Arm portion 15 ₄ Engagement portion 16 Hub brake spring 24 Connection piece

Claims (2)

[Scope of utility model registration request] Claim 1: A hub brake for regulating the rotation of the reel hubs is slidably provided inside a case rotatably housing a pair of reel hubs wrapped with tape, and a prism for detecting the end of the tape is provided in the case. 1. A tape cassette comprising: a holding piece for slidably supporting the hub brake and the prism, which are integrally molded and disposed on the inner surface of the upper case. 2. The holding piece and the prism are integrally formed with holding pieces facing each other on both sides of a substantially inverted U-shaped connecting piece, and prisms facing each other at both front ends thereof. The tape cassette according to claim 1.