JPH06236655A - Tape cassette - Google Patents

Abstract

PURPOSE:To obtain a tape cassette stable in the running performance, the tape guide part of which is formed to a blocked structure, by integrally connecting guide pins at a connection part and integrally constituting a guide block provided with guide parts to the guide pins. CONSTITUTION:A pair of guide pins 53, 53 arranged on a running course so that the tape is freely run, is integrally connected at the connection part 25 located along the outer periphery of a tape pad housing part 29. They are incorporated as a guide block member 5 which integrally constitutes the guide block 15 provided with the plural guide parts 51, 52 to each guide pin 53, 53 with the planar connection part 16 parallel along the inner surface of an upper case 1 or a lower case 2. By this constitution, even though the tape guide parts are formed to the blocked structure including the guide pins 53, the assembling work is easy, the tape running performance is stabilized, and the handling is made without causing the tape damage, then the tape cassette favorably assembled with the compact guide block 15 and also capable of supporting/ reinforcing the guide pins 53 after the assemblage, is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing medium such as a video cassette or a digital compact cassette, a magnetic tape cartridge and other tape cassettes in which a tape-shaped recording medium is housed in a case, and in particular, a tape is rotatably provided. The present invention relates to a tape cassette wound around a hub or a reel and movably arranged.

[0002]

2. Description of the Related Art In a conventional tape cassette, a tape of a tape winding body provided in a cassette case is provided so that it can travel freely via a tape guide. However, it is known that the block pin is used and the guide pin is incorporated as a metal pin.

[0003]

This conventional metal guide pin is expensive, the assembly work is complicated, and the productivity is low, and the tape guide portion having the block structure has a plurality of parts so as not to hinder the tape running. In order to form the guide portion, each guide portion is connected, but due to the positional relationship of the reel area inside the case, the reference hole and the head pressure contact pad, the respective guide portions cannot be connected, When the guide part of the tape contact part, which requires the best surface quality accuracy for tape running, is molded with a block structure, the guide part becomes the final filling position due to the relationship with the gate position, resulting in poor surface quality. This is a cause of instability of the tape running, it is easy to damage the tape, and it is a friction material contained in the back coating agent coated on the back side of the tape, and the cutting of the guide part often causes cutting powder. In addition, the large block structure, which is difficult to cut with high hardness, is expensive and does not satisfy other required qualities, which hinders formability and assembly workability, and provides flexibility in case material selection. However, there was a problem in terms of reliability and cost. The present invention is intended to eliminate these various drawbacks. Even if the tape guide portion has a block structure including a guide pin, the assembling work is simplified, the surface property of the guide portion is maintained and secured, and the tape running property is improved. Can be handled without damaging the tape, the compact guide block can be assembled well, and the guide pins can be supported and reinforced after assembly, preventing deformation and making a reliable tape cassette at low cost. It is intended to be provided in the form.

[0004]

According to the present invention, a tape is wound around a pair of hubs or reels rotatably provided inside a cassette case consisting of an upper case and a lower case, and the tape is movably arranged. In a tape cassette provided with a guide pin and a guide block having a guide portion in the tape running path, the guide pin is integrally coupled at a connecting portion along the partition of the tape pad accommodating portion, and each of the guide pins has a plate-like connecting portion. In the tape cassette, a guide block having a guide portion is integrally configured.

[0005]

When the tape wound around the hub that rotates inside the case travels through the tape guide rollers, a plurality of guide portions including the guide pins that intervene in the tape travel path are provided on the upstream side of the tape travel. The guide parts of the block structure, which are isolated on the downstream side and the downstream side, are arranged appropriately without blocking the reference holes, and the running tape is guided and moved while contacting the smooth guide parts to record the tape. The reproduction can be performed stably.

[0006]

1 to 5, an embodiment of the present invention will be described. A pair of hubs 3, 3 or reels rotatably provided inside a cassette case consisting of an upper case 1 and a lower case 2 is used. A tape cassette including a tape 4 wound around it and provided with a guide block member 5 having a pair of guide pins 5 ₃ and 5 ₃ and guide portions 5 ₁ and 5 ₂ in a traveling path on which the tape 4 is movably arranged. , Both guide pins 5 ₃ and 5 ₃ are integrally connected at a connecting portion 25 along the outer periphery of the tape pad storage portion 24, and are parallel to the respective guide pins 5 ₃ and 5 ₃ along the inner surface of the upper case 1 or the lower case 2. A tape cassette is constructed by incorporating a guide block 15 having a plurality of guide portions 5 ₁ and 5 ₂ as a block member 5 integrally formed by a flat plate-shaped connecting portion 16.

In this case, as the guide block member 5, as shown in FIGS. 2A and 2B, a guide block 15 of a vertical connecting member having a U-shaped cross section and a plate-like connecting portion 16 of a horizontal connecting member are provided as guide portions 5 ₁ , 5 ₂ and the guide pin 5 ₃ are integrated into a block structure, but the plate-like connecting portion 16 has a rectangular cross section and is detoured along the outside of the primary and secondary reference holes 20 and 21 formed in the upper and lower cases to form a reference. It is deployed avoiding holes.

The guide block member 5 is made of a material separate from the upper and lower cases and having good cutting resistance in order to improve the smoothness of the tape for high density recording. For example, the guide portions 5 ₁ , 5 ₂ and the guide pin 5 ₃ It is preferable to mold from hard-to-cut materials such as PA-based resin and PP-based resin that are hard to cut, and can prevent scraping due to the tape back coat, use only the minimum necessary materials, and have the freedom of material selection. Although it also contributes to the cost reduction, the engaging projections 17 to be fitted into the fitting holes or fitting recesses (not shown) provided in the upper and lower cases 1 and 2 are provided above and below the guide pin 5 ₃ . It is provided so as to project at both ends, and is used for temporary fixing at the time of assembling into the case and fixing for preventing deformation after assembling. Then, the guide block member 5 is provided with the positioning convex portion 2 protruding from the lower case 2.
It is preferable to fit between the partition wall 23 and the partition wall 23 and to fix the convex portion 17 for temporary fixing. (Figs. 3 and 4)

The connecting portion 25 is a plate-like connecting piece having a substantially rectangular cross section, and is bent in a U-shape along the shield plate 11 provided on the back side of the tape pad accommodating portion 24 to guide the guide pins 5 ₃ , 5. _The plate-like connecting portion 1 that connects the guide block 15 and the guide pin 5 ₃ is interposed between the _three.
It is also possible to use a U-shaped plate-like connecting piece 25 ₁ parallel to the inner surface of the upper case 1 or the lower case 2 in which 6 is extended,
If necessary, the plate-like connecting portion 25 or the plate-like connecting piece 25 ₁ is provided with a notch 2 which is fitted into a rib or a partition protruding in the case.
It is also considered that 7 is provided to serve for holding and fixing.
Further, the plate-like connecting portion 16 is also integrated by a plate-like piece parallel to the inner surface of the upper case 1 or the lower case 2 to form the reference holes 20, 21.
This is useful for strengthening the support and preventing the deformation of the guide pin 5 ₃ after it has been assembled, while ensuring good assembling.

In the running path of the tape 4, guide rollers 6, 6 and a leaf spring 7 having a cleaning member that abuts on the guide rollers 6 are provided, so that the tape running property is remarkably stabilized and the cleaning function is improved. I am able to demonstrate it. Further, in the guide block member 5, the position of the gate 14 is set to the guide portions 5 ₁ and 5 ₂ and the guide pin 5 ₃ so that each guide portion does not reach the final filling position during resin molding.
It is preferable to use a wear resistant pin and a wear resistant guide block as a three-point gate. (Fig. 2)

In the figure, 8 is a coupling boss, 9 is a tape pad,
10 is a tape traveling position regulating member, 11 is a shield plate, 1
Reference numeral 2 is a liner sheet, 13 is a hub support portion, and 19 is a shutter, which is slidably fitted in the cassette case. Reference numeral 26 is a roller support shaft, 28 is an erroneous erasure prevention piece, and 29 is a shutter urging spring.

Although the plate-like connecting portion 16 of the guide block member 5 is provided above the position where it contacts the inner surface of the upper case 1, it may be provided below the position where it contacts the inner surface of the lower case 2. Well, a pair of top and bottom, guide pin 5
_The bridge 3 can be connected to the center at a position where the tape 3 of 3 does not contact.

In the example of FIG. 6, a U-shaped plate-like connecting piece 25 _{1 serving as} a connecting portion is provided above the guide pins 5 ₃ , 5 ₃ so that it can be inserted into the gap of the tape pad accommodating portion. The connecting portion 16 is extended.

[0014]

According to the present invention, in a tape cassette provided with a guide pin and a guide block having a guide portion in the tape running path, the guide pin is integrally connected at a connecting portion along the partition wall of the tape pad accommodating portion. By integrating the guide block with the guide part by the plate-shaped connecting part, the tape guide part can be easily assembled even if the tape guide part has a block structure including the guide pin. Maintain stability and stabilize tape running performance, handle without tape damage, and assemble with a compact guide block to enhance guide pin support after assembly, and help prevent deformation. We can provide a reliable tape cassette in a low-cost form, and the tape guide part is composed of a material with good abrasion resistance and using the minimum necessary material. Since kill, prevent scraping guide portion, the degree of freedom in the case of material selection is also enhanced, also enables material cost savings.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of the present invention in a separated state.

2 is an enlarged front view of the guide block of the example of FIG. 1,
B is the top view.

FIG. 3 is a partially enlarged plan view showing a state where the guide block of the example of FIG. 2 is incorporated in a lower case.

FIG. 4 is an enlarged plan view showing the inside of the example of FIG. 1 in use, except for the upper case.

FIG. 5 is a perspective view of the cassette seen from the bottom side, showing an opened state of the shutter.

FIG. 6 is an enlarged perspective view of a guide block according to another embodiment of the present invention.

[Explanation of symbols]

1 Upper case 2 Lower case 3 Hub 4 Tape 5 Guide block member 5 ₁ Guide part 5 ₂ Guide part 5 ₃ Guide part 6 Guide roller 7 Leaf spring 8 Coupling boss 9 Tape pad 14 Gate 15 Guide block 16 Plate-like connecting part 17 Supporting protrusions 22 Convex portions 23 Partition walls 24 Pad storage portion 25 Connection portion 25 ₁ Connection piece

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Morimasa Sasaki 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation

Claims (4)

[Claims] 1. A tape is wound around a pair of hubs or reels that are rotatably provided inside a cassette case consisting of an upper case and a lower case, and a guide pin is provided in a tape running path where the tape is movably arranged. In a tape cassette provided with a guide block having a guide portion, guide pins are integrally connected at a connecting portion along a partition wall of a tape pad accommodating portion, and a guide block having a guide portion is provided at each of the guide pins with a plate-like connecting portion. A tape cassette characterized by being integrally configured. 2. The connecting portion is a plate-like connecting piece having a rectangular cross section, which is bent in a U shape along a shield plate provided on the back side of the tape pad and is interposed between the guide pins. Item 1. The tape cassette according to Item 1. 3. The tape cassette according to claim 1, wherein the connecting portion is a U-shaped plate-shaped piece that is parallel along the inner surface of the upper case and extends a plate-shaped connecting portion that connects the guide block and the guide pin. 4. The guide pin is made of a PA-based resin or a PP-based resin, and the engaging projections fitted in the fitting holes or the fitting recesses provided in the upper and lower cases are positioned above and below the guide pin. The projecting part is provided so as to protrude from
The described tape cassette.