JPH054377U - Tape cassette - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] It is not necessary to take up a large area for installing the brake mechanism in the tape cassette, it has a compact structure, and it can exhibit an accurate and stable braking action. Simplifies insertion and assembly into the case. [Structure] A tape cassette comprising a pair of reel brakes for braking with a spring force so as not to cause tape slack when the tape cassette is not used, and a release lever for interlocking both reel brakes. An operation cam portion facing the insertion hole of the release pin on the recording / reproducing device side is provided at one end, and an abutment portion for both reel brakes is provided at the other end via an intermediate supporting rod portion extending between reels, A release lever is slidably provided in the case by pressing the contact portion against both reel brakes, and a stable and reliable braking action can be achieved even if the brake mechanism is arranged in a narrow restricted area of the case. However, the assembling work into the case can be simplified.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

The present invention relates to a magnetic tape cassette for recording / reproducing digital signals, particularly a video tape cassette in which a tape is wound around a reel, an 8 mm tape cassette, a VHS cassette, and other tape cassettes.

[0002]

[Prior art]

At present, in a magnetic tape cassette used in a PCM recording / reproducing apparatus for converting an analog signal such as an acoustic signal into a digital signal, for example, a PCM signal and recording or reproducing the same on a magnetic tape, a pair of reels around which a magnetic tape is wound is a cassette. A brake member that engages and disengages with the locking teeth formed on the reel prevents the tape from slackening when not in use (at the time of storage), and its rotation is restricted. The reel brake is released by the reel brake release means from the tape reel so that the tape reel can freely rotate. As disclosed in Japanese Utility Model Laid-Open No. 52-147420, a conventional brake member is supported by a shaft provided in a case and is urged by a spring to release the recording / reproducing apparatus from the inside of the cassette. It is known to provide a tape cassette having a brake mechanism that moves a release lever or other member to release the interlocking of the brake member with the release lever or other member.

[0003]

[Problems to be solved by the device]

When the conventional brake mechanism is applied to a cassette case having a relatively small size, since it is provided between both reels at the central position on the front lid side of the case, the installation area for the brake mechanism is narrow and the release lever There is a problem that the rotational displacement of the reel brake cannot be accommodated within the range with respect to the amount of movement, and the rotational movement of the brake lever is also restricted to a small extent, and the braking action is unavoidable and the braking mechanism is inevitable. There was a problem that it was not sufficiently satisfactory, and insertion and assembly into the case was troublesome. The present invention is intended to eliminate these conventional problems, and stabilizes the braking action even when the brake mechanism is deployed in a narrow area provided in the case, and is suitable enough for the required brake mechanism. The purpose of the present invention is to provide a tape cassette that can exhibit various braking functions in a compact structure, and in an easily assembled and manufactured form.

[0004]

[Means for Solving the Problems]

The present invention has a pair of reels for winding a tape, a pair of reel brakes having springs that are engaged and disengaged with locking teeth formed on both reels, and are biased in the locking direction, and release both reel brakes. A tape cassette provided with a release lever that is interlocked with each other, the release lever having an operation cam portion located at one end facing the insertion hole of the release pin on the recording and reproducing device side, and extending between both tape reels. It is characterized in that a contact portion for both reel brakes is provided at the other end via the support rod portion, and the release lever is slidably arranged in the case by pressing the corresponding contact portion against both reel brakes. It is a tape cassette.

[0005]

[Action]

The present invention of a video tape cassette, when loaded on the recording and reproducing apparatus, coming in from the insertion hole 10 by moving the release pin P from the device into the case 1, the inclined inner surface ₇₁ of the operating cam portion 7 of the release lever 8 When still increasing in contact with the release lever 8 is slid into the case rear, moves to the side surface of the release pin P from the opening 7 _2, is supported. Nail of this reel brake 3,3 in abutment 6 at the other end by a sliding of the release lever 8 is rotated against the spring 4 in the releasing direction of the reel brake each other around the support shaft 3 ₁ and the other end pieces 3 ₂ away from the reel engaging Tomeha 2 _1, the tape reel 2 is rotatable reel brake 3 is released. Further, when the cassette is removed from the recording / reproducing apparatus, when the release pin P comes out of the insertion hole 10 of the cassette, the release lever 8 is pushed back by the brake spring 4 and slides.
Those claw portions reel brake 3 is rotated by additionally cerebrospinal in place with the movement of the contact portion 6 to precisely such that there is no tape winding slack by rotation restriction is engaged into the locking tooth 2 ₁ reel 2 It is used by holding.

[0006]

【Example】

An embodiment of the present invention will be described with reference to FIG. 1 to FIG. 5. A pair of reels 2, 2 rotatably provided in a case 1 is provided with a tape wound around it, and locking teeth 2 formed on the reel 2 are provided. A tape cassette including a pair of reel brakes 3 each having a spring 4 that is engaged and disengaged in ₁ and is biased in a locking direction, and a release lever 8 that interlocks both reel brakes 3 and 3 in a releasing direction. The release lever 8 has an operation cam portion 7 located at one end facing the insertion hole 10 of the release pin P on the recording / reproducing apparatus side, and passes through an intermediate rod portion extending between the tape reels 2 and 2 to the other end. A tape cassette is provided which is provided with an abutting portion 6 for both reel brakes 3, 3 and presses the corresponding abutting portion 6 against both reel brakes 3, 3 to dispose a release lever 8 slidably in the case 1. There is.

[0007] As the operation cam unit 7, the inclined inner surface ₇₁ which can abut the top surface of the release pin P,
Have a vertical end face 7 ₂ along the side surface of the release pin P, is formed on Shieruta portion covering the insertion hole 10 of the release pin P. Furthermore, as the reel brake 3 is rotatably supported around a support shaft 3 _1, a claw piece 3 ₂ for locking the reel engaging Tomeha 2 ₁ at one end, the release to the other lever 8
Has a support piece 3 ₃ abuts and presses the said supporting pieces 3 ₃ the contact portion 6 of the release lever 8 provided with a spring 4 for urging the brake position, further wherein the release lever 8 is in, The intermediate supporting member is fitted between the guide ribs 5 and 5 or the guide groove protrudingly provided on the inner surface of the lower case, and the regulating piece 13 of the upper case is in contact with and slides in the horizontal direction. The release lever 8 is pressed and connected to the reel brake 3 so as to move in the front-rear direction and interlock with the reel brake 3 via the contact portion 6, so that the reel brake 3 is supported by the support shaft 3. ₁ claw piece 3 ₂ mutually the other end of the pivoted away from the reel engaging Tomeha 2 ₁ about the, so along the side surface of the release pin P in the vertical plane 7 ₂ of the operating cam portion 7, excessive release lever The reel brake 3 is released without pushing 8 and the reel 2 can rotate. That is, the portion against which the release lever 8 is pressed is the inclined surface 7 of the operation cam portion 7.
_The brake 3 is rotated only by ₁ (action surface), and otherwise, the reel 3 is kept stationary without following the movement of the reel brake 3, and the reel brake 3 does not rotate more than necessary. Even in the area, the brake mechanism can be provided in a satisfactory state. In the figure, 11 is a reel hub hole, and 12 is a tape. In order to fit the release lever 8 between the guide ribs 5 and 5 or in the guide groove of the lower case, a fitting structure in which the release lever 8 moves in the horizontal direction while restricting the upward movement is taken into consideration. It is possible to select a configuration in which a hook-shaped restricting piece or a protrusion is provided on the upper surface of the release lever 8 and the release lever 8 can smoothly slide in the horizontal direction even when the release pin P is pushed up.

[0008]

[Effect of device]

The present invention has a pair of reels for winding a tape, a pair of reel brakes having springs that are engaged and disengaged with locking teeth formed on both reels, and are biased in the locking direction, and both reel brakes are released. A tape cassette provided with a release lever that is interlocked with each other, the release lever having an operation cam portion located at one end facing the insertion hole of the release pin on the recording and reproducing device side, and extending between both tape reels. By providing a contact portion for both reel brakes at the other end through the support rod portion, the contact portion is pressed against both reel brakes, and the release lever is slidably arranged in the case.
The reel brake member and the release lever member including the insertion hole for the brake release pin can be placed in different positions, so that the brake function can be easily exerted even in a narrow area, and even a slight movement of the release lever greatly increases the rotational movement of the brake lever. After the required rotational displacement is obtained, the rotational movement is not performed more than necessary. Therefore, the braking mechanism can be arranged in a narrow area, and the braking action can be made accurate and stable. At the same time, it is possible to switch from the linked state of the reel brake to the stationary state even if the movement of the release to follow to the device side is large, and the rotational displacement of the reel brake can be contained within a narrow area with respect to the movement amount of the release. The insertion hole of the brake release pin can be closed when not in use and can be opened only when not in use, making it easy to prevent dust from entering the case. It is ability can be improved considerably easy and become productive insertion assembly work in a narrow region case made in pre-assembled are configured to brake mechanism as an assembly.

[Brief description of drawings]

FIG. 1 is a plan view of a lower case according to an embodiment of the present invention in which rotation of a reel is blocked.

FIG. 2 is a plan view showing a state where the reel of the lower case is freely rotatable.

3A and 3B are enlarged vertical cross-sectional views of the operating state taken along the line aa in FIG. 1, where FIG. 3A is immediately before the release lever is moved, and FIG. 3B is when the release lever is completely moved.

FIG. 4 is a plan view of a part of the use state of the reel brake when the brake is released.

FIG. 5 is a partial plan view of the reel brake in a locked state.

[Explanation of symbols]

1 Case 2 Reel 2 ₁ Locking tooth 3 Reel brake 3 ₁ Support shaft 3 ₂ Claw piece 3 ₃ Support piece 4 Spring 5 Guide 6 Contact part 7 Operation cam part 7 ₁ Inclined inner surface 7 ₂ Vertical end surface 8 Release lever 10 Release pin Insertion hole P Release pin

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Motohiko Shima             1-13-1, Nihonbashi, Chuo-ku, Tokyo             -Deay K Co., Ltd.

Claims (4)

[Scope of utility model registration request] 1. A pair of reel brakes, each having a pair of reels around which a tape is wound, a pair of reel brakes having springs that are engaged and disengaged with locking teeth formed on both reels, and are biased in the locking direction. It is a tape cassette provided with a release lever which is interlocked with a release direction, the release lever having an operation cam portion facing an insertion hole of a release pin on the recording / reproducing apparatus side at one end and extending between both tape reels. It is characterized in that a contact portion for both reel brakes is provided at the other end through the intermediate supporting portion, and the release lever is slidably arranged in the case by pressing the corresponding contact portion against both reel brakes. Tape cassette to do. 2. The tape according to claim 1, wherein the operation cam portion has an inclined inner surface capable of contacting the top surface of the release pin, and a vertical end surface, and a sielter portion covering the release pin insertion hole. cassette. 3. The reel brake is rotatably supported about a support shaft, and has a pawl piece that engages with a reel engaging tooth at one end and a support piece that abuts against a release lever at the other end, A spring for urging to a braking position is provided.
Or the tape cassette described in 2. 4. The release lever according to claim 1, wherein an intermediate supporting rod portion of the release lever is fitted between guide ribs or guide grooves provided on the inner surface of the lower case so as to slide in the horizontal direction. Tape cassette.