JPH06236654A - 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 constituting a guide pin at a planar connection part on one end of a guide block dividedly provided. CONSTITUTION:On a running course provided so that the tape is freely run, the guide blocks 15 having plural guide parts 51, 52 are arranged by dividing to the upstream side and downstream side of the tape running course. They are incorporated as a guide block member 5 which integrally constitutes the guide pins 53 on one end of each guide block 15 with the planar connection part 16 parallel along the inner surface of the upper case 1 or lower case 2. By this constitution, even though the tape guide parts are formed to the blocked structure including the guide pins 53, the tape running performance is stabilized while keeping and securing the surface characteristic of the guide parts 51, 52, and the handling is made without causing the tape damage, then the reliable tape cassette favorably assembled with the compact guide blocks 15 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 winding body provided in a cassette case is provided so that it can travel freely via a tape guide. It is known that a block structure 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 accuracy for running the tape, is resin molded with a block structure, the guide part becomes the final filling position due to the relationship with the gate position, and the surface property is poor. It becomes an instability factor of the tape running, it is easy to damage the tape, and the friction material contained in the back coating agent coated on the back surface of the tape often causes the abrasion of the guide part, which causes a lot of dust. In addition, the large block structure, which is difficult to cut with high hardness, is expensive and does not satisfy other required qualities. However, there was a problem in terms of reliability and cost. The present invention is intended to eliminate these drawbacks, and even if the tape guide portion has a block structure including guide pins, the surface property of the guide portion is maintained and secured, and the tape running property is remarkably stabilized, resulting in tape damage. It is an object of the present invention to provide a reliable tape cassette in a low-cost form, which can be handled without causing any trouble, and is assembled well with a compact guide block.

[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 block having a guide portion on the tape running path and a guide pin, the guide block is provided separately on the upstream side and the downstream side of the tape running path, and the guide pin is provided at one end of each guide block. Is a tape cassette characterized in that it is integrally configured by parallel plate-shaped connecting portions along the inner surface of the upper case or the lower case.

[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 upstream of the tape travel. The guide part of the block structure divided into the side and the downstream side is arranged properly without blocking the reference holes, and the running tape is guided and moved while contacting each smooth guide part. Recording and reproduction can be performed stably.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the examples of FIGS. 1 to 6 in which a pair of hubs 3, 3 or reels rotatably provided inside a cassette case composed of an upper case 1 and a lower case 2. The tape 4 is wound, and a guide block 15 having a plurality of guide portions 5 ₁ and 5 ₂ is provided on the running path on which the tape 4 is movably arranged, divided into an upstream side and a downstream side of the tape running path. A guide pin 5 ₃ is incorporated into one end of each guide block 15 as a block member 5 integrally formed by a plate-like connecting portion 16 parallel to the inner surface of the upper case or the lower case to form a tape cassette.

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.

In order to improve the smoothness of the tape for high-density recording, the guide block member 5 is made of a material separate from the upper and lower cases and having good abrasion resistance. For example, the guide portions 5 ₁ , 5 ₂
And the guide pins 5 ₃ including PA-based resin, to mold the hard-to-cut materials scraped hard high hardness such as PP resins may, abrasion by the tape back coating can be prevented, requires only minimum material use, material While increasing the freedom of choice,
Although it contributes to cost reduction, the locking projections 17 that fit into the fitting holes or fitting recesses (not shown) provided in the upper and lower cases 1 and 2 are projected at both upper and lower end positions of the guide pin 5 _3. It is provided for the purpose of temporary fixing at the time of assembly to the case and fixing for preventing deformation after assembly. Then, the guide block member 5 is preferably fitted between the partitioning projections 22 and the positioning projections 22 provided on the lower case 2 and fixed by the temporary fixing projections 17. (Figs. 3 and 4)

In the running path of the tape 4, guide rollers 6, 6 and a leaf spring 7 having a cleaning member that comes into contact with the guide rollers 6 are provided to remarkably stabilize the tape running property and to improve the cleaning function. 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.

[0012]

According to the present invention, in a tape cassette provided with a guide block having a guide portion in the tape running path and a guide pin, the guide block is provided separately on the upstream side and the downstream side of the tape running path. The guide pins are integrated into one end of each guide block by parallel plate-shaped connecting parts along the inner surface of the upper case or the lower case. The tape guide part can be provided in a low-cost form with a stable guide tape handleability, which can be handled without damaging the tape, can be assembled with a compact guide block, and can be reliably assembled. Since it can be configured with a material with good machinability and using the minimum necessary material, it prevents the guide part from being scraped and the material of the case can be selected Also increased, also allow 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.

[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 pin 6 Guide roller 7 Leaf spring 8 Coupling boss 9 Tape pad 14 Gate 15 Guide block 16 Plate-like connecting part 17 Supporting projections 22 Projections 23 Partition walls

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

Claims (3)

[Claims] 1. A tape is wound around a pair of hubs or reels that are rotatably provided inside a cassette case composed of an upper case and a lower case, and the tape is provided with a guide portion in a tape traveling path where the tape is movably arranged. In a tape cassette provided with a certain guide block and a guide pin, the guide block is provided separately on the upstream side and the downstream side of the tape traveling path, and the guide pin is provided at one end of each guide block on the inner surface of the upper case or the lower case. A tape cassette characterized in that it is integrally configured by parallel plate-shaped connecting portions. 2. 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 tape cassette according to claim 1, wherein the tape cassette is provided so as to project. 3. The tape cassette according to claim 1, wherein the connecting portion is provided along the outside of the reference hole formed in the upper and lower cases with a rectangular cross section and avoiding the reference hole.