JPH0447819Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tape cassette suitable for recording digital signals such as PCM signals, and in particular relates to a brake member for regulating the rotation of a reel hub. be.

[Summary of the idea]

The present invention provides a tape cassette in which a brake member for regulating the rotation of a reel hub is slidably caulked to a caulking pin provided on an upper half through a long hole formed in the sliding direction of the brake member. By forming a convex part on both the left and right sides of the support plate part as a storage area for the head of the caulking pin, and by using the concave part created between the two convex parts as a spring storage area, the spring can be attached to the magnetic tape. This allows the brake member to slide smoothly without interference.

[Conventional technology]

BACKGROUND ART Currently, a PCM recording and reproducing apparatus has been proposed that converts an analog signal such as an acoustic signal into a digital signal, such as a PCM signal, and records (or reproduces) the converted signal on a magnetic tape. Some PCM recording and reproducing apparatuses use a rotating head to achieve a relatively high recording density. Using this rotating head
In a PCM recording/reproducing apparatus, during recording or reproduction, a magnetic tape is pulled out from a tape cassette and loaded onto a rotating drum provided with a rotating head.

By the way, in the tape cassette into which this magnetic tape is loaded, if a finger touches the magnetic tape and oil or fat or dust gets on it, a dropout occurs in the playback signal, so it is important to avoid touching the magnetic tape with fingers or getting dust. It is necessary to seal the magnetic tape as tightly as possible to prevent this.

Conventional tape cassettes of this type include, for example, the "Utility Application No. 156119 (1986)" proposed by the present applicant.
There is a "No."

This tape cassette will be explained with reference to FIGS. 4 to 6. Reference numeral 1 indicates a cassette case;
This cassette case 1 is composed of a pair of upper half 2 and lower half 3 that are joined together by screws. 2a is a transparent window plate provided on the upper surface of the upper half 2. 4a and 4b are cassette case 1
A pair of reel hubs are rotatably fitted loosely into a pair of reel shaft insertion holes 5a and 5b that are housed in the lower half 3 and provided at predetermined positions in the lower half 3, and a magnetic tape 6 is inserted into the pair of reel hubs 4a and 4b. rolled around.

Reference numerals 7a and 7b are tape guide columns provided near the left and right side walls facing the front surface, respectively, and the magnetic tape 6 is wound around these tape guide columns 7a and 7b to maintain a predetermined position on the front surface. It is made runnable. Reference numeral 3a denotes a cutout section in which the lower half 3 on the back side of the magnetic tape 6 wound around the tape guide columns 7a and 7b is cut out in a substantially rectangular shape over a predetermined width.
A guide system for pulling out the magnetic tape from the recording/reproducing device is inserted into the inside a.

Reference numeral 8 denotes a front cover that is pivotally supported by arm portions 8a and 8b on both sides so as to be able to rotate toward the front side of the cassette case 1, and the front side of the cassette case 1 is closed by the front cover 8. Ru.

Reference numeral 9 denotes a slider having a substantially U-shaped cross section and facing the lower surface and left and right side walls of the lower half 3 and sliding in the front-rear direction. Further, 9a and 9b are inserted into the reel shaft insertion holes 5a and 5b, respectively, when the slider 9 is slid backward to open the notch 3a.
This is a reel shaft insertion hole drilled in the slider 9 in correspondence with the reel shaft insertion hole.

Further, when the slider 9 is slid forward with the front cover 8 closed, its reel shaft insertion holes 9a and 9b are in a state where they do not correspond to the reel shaft insertion holes 5a and 5b of the cassette case 1. At the same time, the notch 3a of the cassette case 1 is closed, and the inside of the cassette case 1 is almost completely sealed.
contact is prevented.

In this state, the side plates 9c and 9 of the slider 9
d is located below the arm portions 8a and 8b of the front cover 8, and the upper edge of the side plate portions 9c and 9d of the slider 9 abuts the lower edge of the arm portions 8a and 8b of the front cover 8, whereby the front The lid 8 is locked unrotatably to prevent the front lid 8 from being opened inadvertently during storage.

In this state, the tape reels 4a and 4 stored in the hermetically sealed cassette case 1 are
A reel brake member 11 is provided within the cassette case 1 to prevent the tape 6 from becoming slack due to unexpected rotation of the tape 6 due to vibration or the like.

This brake member 11 includes an upper surface support plate portion 11a along the inner surface of the upper half 2, and leg portions 11 vertically provided below both left and right ends of this upper surface support plate portion 11a.
b, 11c are formed into a substantially U-shaped cross section, and ratchet wheels 4c, 4d formed on the reel hubs 4a, 4b are provided at the rear edge of the upper support plate portion 11a.
Brake protrusions 11d and 11e are provided correspondingly to the brake protrusions 11d and 11e, and an operator 1 is provided at the ends of the legs 11b and 11c.
1g and 11h are formed.

In addition, the upper surface support plate portion 1 of this brake member 11 is
1a is formed such that its central portion protrudes upward, that is, toward the upper half side, forming a convex portion 12, and a spring 14 is attached to a mounting portion 13 formed at the center portion of the back side of this convex portion 12, The end portion of this spring 14 is abutted against and locked to the front wall 2b of the upper half 2.

Moreover, the upper surface support plate portion 1 of this brake member 11
Elongated holes 15 are formed on the left and right sides of 1a, and in these elongated holes 15, the brake member 11 is inserted and engaged with a caulking pin 16 protruding from the back side of the upper half 2, and in this state, the tip of the caulking pin 16 is inserted. By caulking to form a retaining head 16a, the brake member 16 is attached to the upper half 2 so as to be slidable in the front-rear direction.

When the tape cassette is stored, this brake member 11 is slid rearward by the biasing force of the spring 14, and the protrusions 11d and 11e are pushed against the reel hub 4.
The reel hubs 4a and 4b are caught on the ratchet wheels 4c and 4d, and the reel hubs 4a and 4b are locked so that they cannot rotate. Further, when the brake member 11 is placed in the cassette case 1, the ends of the operating elements 11g and 11h project a predetermined amount to the outside of the front end of the side wall through the operating element insertion holes of the lower half 3. , when the front cover 8 is rotated upward, this protruding operator 11
g, 11h are pressed by the ends of the arm portions 8a, 8b of the front cover 8, and the brake member 11 is pressed by the spring 14.
The brake protrusions 11d and 11e are separated from the ratchet wheels of the reel hubs 4a and 4b, allowing the reel hubs 4a and 4b to rotate.

[Problem that the invention attempts to solve]

However, in this conventional tape cassette, the central part of the upper support plate of the brake member is formed into a convex shape that protrudes toward the upper half, and a spring is attached to the back side of this convex part, that is, on the magnetic tape storage side. Because of this, there is a risk that the spring may shift due to shocks applied to the cassette case and interfere with the magnetic tape.Also, the brake member has a large sliding contact area with the upper half, so the resistance will be large. There were drawbacks such as difficulty in sliding smoothly.

The present invention has been made in view of these points, and attempts to solve the above-mentioned problems by devising the shape of the brake member.

[Means for solving problems]

In order to achieve the above object, the present invention includes a pair of reel hubs on which magnetic tape is wound inside the upper and lower halves of a cassette case, a brake member for regulating the rotation of the reel hubs, and a brake member that controls the rotation of the reel hubs. The brake member is slidably attached to the caulking pin provided in the upper half through the left and right elongated holes formed in the upper support plate portion. In this tape cassette, convex portions protruding toward the upper half are formed on both left and right sides of the upper support plate portion of the brake member, and elongated holes are formed in the convex portions, and concave portions are formed between the convex portions. It is designed to have a spring attached to it.

[Effect]

In a tape cassette having a brake member formed in this manner, the area between the concave part of the brake member and the upper half is used as a spring storage area, and the back side of the convex part is used as a storage area for the head of the swage pin, so that the spring can be stored in the tape cassette. There is no interference with the magnetic tape, and the brake member slides smoothly against the upper half with little sliding resistance.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to FIGS. 1 to 3. Parts corresponding to the conventional example shown in FIGS. 4 to 6 described above are designated by the same reference numerals. Explanation will be omitted.

In the tape cassette according to the present invention, the brake member 21 that restricts the rotation of the reel hubs 4a, 4b is formed into a new uneven shape that has not been seen before.

That is, this brake member 21 is formed into a substantially U-shaped cross section having an upper support plate portion 21a and leg portions 21b, 21c, similar to the brake member in the conventional tape cassette described above, and has leg portions 21b, 21c.
Although the operating elements 21g and 21h are formed at the tip of c, a convex part 22 is formed on both left and right sides of the upper surface support plate part 21a and protrudes to the upper half 2 side with a required width. A long hole 15 is formed in each.

Further, by forming the convex portions 22 on both sides in this way, a concave portion 23 is formed between both convex portions 22, and a spring mounting portion 24 is formed at the center of the upper surface of this concave portion 23. A spring 14 is attached to this, and brake protrusions 21d and 21e protruding from the rear edge of this concave portion 23 are secured to ratchet wheels 4c and 4d of both reel rods 4a and 4b. . Then, the long holes 15 of the convex portions 22 on both sides are inserted and engaged with the caulking pins 16 of the upper half 2, and in this state, the tips of the caulking pins 16 are caulked to form a retaining head 16a. .

When the brake member 21 is attached to the upper half 2 in this manner, the head 16a of the caulking pin 16 is housed in the recess on the back side of the convex portion 22, and the lower surface of the upper support plate portion 21a of the brake member 21 is It doesn't get any more prominent.

The brake member 21 attached to the upper half 22 in this manner is slid rearward by the biasing force of the spring 14 when the tape cassette is stored, and the protrusions 21d and 21e are attached to the reel hub 4a, 4b, this reel hub 4
a, 4b are locked so that they cannot rotate, and when the front cover 8 is open, the operators 21g, 21h are pressed by the ends of the arms 8a, 8b of the front cover 8, and slide forward. However, the protrusions 21d and 21e are moved away from the reel hubs 4a and 4b to be unlocked.

Brake member 2 configured and operated as described above
1, the spring 14 of the brake member 21 is attached to a mounting portion 24 provided in a recessed portion 23 and housed between this recessed portion 23 and the back side of the upper half 2. Due to the condition
This spring 14 does not interfere with the magnetic tape 6 stored under the brake member 21.

Further, since the brake member 21 is in sliding contact with the back side of the upper half 2 at the convex portions 22 on both sides, the sliding contact area between the brake member 21 and the upper half 2 is small, and therefore the brake member 21 has a sliding resistance. becomes smaller and slides more smoothly.

Furthermore, in this example, brake protrusions 21d and 21 are provided on the rear edge of the concave portion 23 of the brake member 21.
When the reel hubs 4a, 4b are locked, the brake protrusions 21d, 21e are locked at the base of the ratchet wheels 4c, 4d of the reel hubs 4a, 4b, that is, at a position closer to the magnetic tape 6. This also has the effect that the reel hubs 4a, 4b can be locked more reliably.

Note that the tape cassette of the present invention is not limited to the present embodiment, and various modifications can be made without departing from the gist of the present invention.

[Effects of the invention] As described above, according to the tape cassette of the invention,
Since the spring of the brake member is arranged between the concave part and the upper half, this spring does not interfere with the magnetic tape, and since the brake member is in sliding contact with the upper half side in the convex part, the sliding contact area is Therefore, the brake member can slide more smoothly.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of the tape cassette of the present invention, Fig. 2 is a longitudinal sectional front view of the tape cassette, Fig. 3 is an explanatory view of the attachment of the brake member to the upper half, and Fig. 4 is a conventional tape cassette. FIG. 5 is an exploded perspective view of the tape cassette, and FIG. 6 is an explanatory view of how the brake member is attached to the upper half of the tape cassette. In the figure, 2 is the upper half, 3 is the lower half, 4a, 4
b is a reel hub, 6 is a magnetic tape, 14 is a spring,
15 is a long hole, 16 is a caulking pin, 21 is a brake member, 22 is a convex portion, and 23 is a concave portion.

Claims (1)

[Scope of Claim for Utility Model Registration] Inside the upper and lower halves of the cassette case, there is a pair of reel hubs around which magnetic tape is wound, a brake member that restricts the rotation of the reel hubs, and a brake member that is connected to the reel hubs. The brake member has a spring that biases the brake member in the direction in which the brake member is stopped, and the brake member is slidably attached to a caulking pin provided on the upper half through long holes on the left and right sides formed in the upper support plate portion of the brake member. In the tape cassette, convex portions protruding toward the upper half are formed on both left and right sides of the upper surface support plate portion of the brake member, the elongated holes are formed in each of the convex portions, and the convex portions on both sides are formed in the tape cassette. A tape cassette characterized in that the above spring is arranged between the parts.