JP2551205Y2 - Tape cassette - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette, and more particularly, to assembling a cassette, even if the lid is rotated in the opening direction when the upper half is in a state before being joined to the lower half. The present invention relates to a tape cassette in which the brake member slides in the direction of the brake release position, and therefore, there is no possibility that assembly failure of the cassette occurs.

[0002]

2. Description of the Related Art As shown in FIG. 4, a general tape cassette has a magnetic tape inside a cassette body (a portion provided with a hub ring 7) comprising an upper half 1 and a lower half (a lower half is not shown). A pair of wound hubs (not shown) are stored. Also, a brake bar 91 is attached to the hub.
Is mounted on the inner surface of the upper half 1, and as shown in FIG. 5, the brake member 9 has a pair of sliding pieces 93 provided on the left and right sides of the upper half 1. Are engaged with a pair of guide pieces 2 protruding from the front end, respectively, so as to be slidable in the front-rear direction, and are always urged in the direction of the brake position by the elastic force of the spring 6. A lid 5 for opening and closing the front end of the cassette body is rotatably attached to the front end of the upper half 1. When the lid 5 is rotated in the opening direction, the left and right sides of the lid 5 are opened. Are engaged with brake arms 92 provided on the left and right sides of the brake member 9 so that the brake member 9 slides in the direction of the brake release position (the direction of the front end of the cassette). .

Conventionally, in the above tape cassette, at the time of assembling, a lower half in which the hub and the like housed in the cassette main body are arranged, the lid 5, the brake member 9
In addition, there is a step of fitting the upper half 1 to which the spring 6 is assembled. At this time, unless the brake member 9 is in the brake release state, the tip of the brake bar 91 contacts the side surface of the hub, and the upper and lower halves cannot be fitted. Therefore, in the state of only the upper half 1, the lid 5 is rotated in the opening direction in advance, the brake member 9 is slid to the brake release position, and the upper and lower halves are fitted.

[0004]

However, since the sliding piece 93 is slidably engaged with the guide piece 2 in the brake member 9, as shown in FIG. There is play in the vertical direction and the horizontal direction (the front-rear direction is the sliding direction). After the upper and lower halves are combined and integrated, the play is limited because the pair of brake arms 92 provided on the left and right sides of the brake member 9 are inserted between the side walls of the upper and lower halves. In the state where only the upper half 1 is provided, the play may be excessively large, and the brake member 9 may be displaced vertically or left and right too much when assembling the cassette. If the brake member 9 is displaced up and down or left and right too much, the engagement between the brake arm 92 and the lid 5 does not work well, and there is a possibility that defective assembly may occur.

[0005] Accordingly, an object of the present invention is to provide a method of assembling a cassette in which a lid and a brake member are attached to an upper half and the brake member is biased by a spring before the upper half is joined to the lower half. In the state, even when the lid is rotated in the opening direction, the brake member surely slides in the direction of the brake release position, and therefore, there is provided a tape cassette which does not cause a cassette assembly failure. It is in.

[0006]

According to the present invention, a pair of hubs around which a magnetic tape is wound are housed in a cassette body composed of an upper half and a lower half, and a brake member for preventing rotation of the hub is provided. A pair of sliding pieces provided on the brake member is engaged with a pair of guide pieces provided on the inner surface of the upper half, respectively, so that the lid is slidably mounted on the upper half, and the lid for opening and closing the front end of the cassette body is raised. The brake member is rotatably attached to the front end of the half, the brake member is constantly biased in the direction of the brake position by the elastic force of a spring, and slides in the direction of the brake release position when the lid is rotated in the opening direction. In the tape cassette configured to move, when the hub is not mounted and the brake member is at a position where the brake member is pressed most by the spring, the brake member is moved. A projection that eliminates a lateral clearance for sliding the brake member is provided on a portion located outside each of the guide pieces, and an engagement surface of the guide piece on the slide piece in the above case. The above object has been achieved by providing a tape cassette characterized in that a convex portion for eliminating a vertical clearance for sliding the brake member is provided in a portion facing the tape cassette.

[0007]

According to the tape cassette of the present invention, at the time of assembling the cassette, the lid and the brake member are attached to the upper half, and the brake member is urged by the spring so that the upper half is not joined to the lower half. In the state, the brake member is slidable in a fixed state where there is no play in the left and right directions due to the protrusion and no play in the vertical direction due to the protrusion at the position where the brake member is most pressed. When the lid is rotated in the opening direction, the lid smoothly engages with the brake arm of the brake member. Immediately thereafter, the brake member is released from the fixed state and is slidable. And returns to the brake position when the cassette is used, and further reaches the brake release position. During use of the cassette, the brake member slides easily between the brake position and the brake release position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape cassette according to the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of the tape cassette according to the embodiment of the present invention when the upper half side is viewed from the inside. FIG. 2A is an enlarged plan view of a main part of the cassette shown in FIG. ) Is a sectional view thereof.

As shown in FIG. 1, the tape cassette of this embodiment has an upper half 1 and a lower half (the lower half is not shown).
A pair of hubs (not shown) around which a magnetic tape is wound is housed in a cassette body (a portion where the hub ring 7 is provided). Also, a brake bar 32 is attached to the hub.
Is mounted on the inner surface of the upper half 1, and the brake member 3
A pair of sliding pieces 4 provided on the left and right sides thereof are respectively engaged with a pair of guiding pieces 2 protruding from the upper half 1 so as to be slidable in the front-rear direction. It is biased in the direction of the position. Also,
A lid 5 for opening and closing the front end of the cassette body is rotatably attached to the front end of the upper half 1. When the lid 5 is turned in the opening direction, the left and right sides of the lid 5 are The brake member 3 is slid in the direction of the brake release position (the direction of the front end of the cassette) by engaging with the brake arms 33 provided on the left and right sides of the brake member 3. The points are configured similarly to this type of conventional product.

As shown in FIG. 1, the tape cassette according to the present embodiment has a structure in which the hub is not mounted and the brake member 3 is at a position where the brake member 3 is most pressed by the spring 6. A projection 31 for eliminating a lateral clearance for sliding of the brake member 3 is provided on a portion of the brake member 3 located outside each of the guide pieces 2. A projection 41 is provided on a portion of the guide piece 2 facing the engagement surface so as to eliminate a vertical clearance for sliding the brake member 3.

The tape cassette according to the present embodiment will be further described. As shown in FIG. 1, the protrusions 31 are provided in a pair of rectangular guide portions provided on both left and right sides of the brake member 3, respectively. The tongue protrudes from one corner (outside of the cassette) located on the front side of the cassette. As shown in FIG. 2, the side edge 31a of the projection 31 is provided obliquely to the sliding direction of the brake member 3, and the left and right side surfaces 31a are provided symmetrically with respect to the center of the cassette (see FIG. 2). (See FIG. 1). When the upper half is present alone, that is, when the hub is not mounted and the brake member 3 is at a position where the brake member 3 is most pressed by the spring 6, the oblique side edge 31a of the brake member 3 The brake member 3 is fixed at the center of the cassette just in contact with the outside of the guide piece 2 of the upper half 1, respectively.

Further, as shown in FIG.
The sliding piece 4 provided on the center side of the cassette in each of the pair of guide portions is formed to project hemispherically on the upper surface of the end portion on the front side of the cassette. The height h of the convex portion 41 shown in FIG. 2B is such that the vertical clearance formed between the upper surface 4a of the sliding piece 4 and the engaging surface 2a of the guide piece 2 can be eliminated. Made and the brake member 3
However, the elastic force of the spring 6 allows the protrusion 41 to slide smoothly in a state where the protrusion 41 is in contact with the engagement surface 2a.

The position of the protrusion 41 in the front-rear direction is
The following conditions are satisfied. That is, when the hub is not present and the brake member 3 is at the position where it is most pressed by the spring 6 (the state shown in FIG. 2A), the convex portion 41 is at a position where it comes into contact with the guide piece 2. There is as it is. After the lid 5 and the brake arm 33 are engaged by the rotation of the lid 5, the brake member 3 is moved to the brake position when the cassette is used (as shown in FIG. When the projection 41 slides to a position where the projection 32 is pressed, the projection 41 comes out of the contact area with the guide piece 2. (Accordingly, in the brake release state when the brake member 3 is further slid, the projection 41 is naturally located outside the range of contact with the guide piece 2.)

In the tape cassette of this embodiment constructed as described above, when assembling the cassette, if the hub 8 is not mounted and the brake member 3 is at the position where it is most pressed by the spring 6, That is, upper half 1
When the brake member 3 is not yet connected to the lower half, the brake member 3 is in a fixed state with no play in up, down, left and right in a normal position, and is slidable. Therefore, by rotating the lid 5,
Can be smoothly engaged with the brake arm 33, and thereafter, the brake member 3 can be easily slid toward the brake release position. Therefore, in the tape cassette of this embodiment, when assembling the cassette, the lid 5 and the brake member 3 are attached to the upper half 1 and the brake member 3 is urged by the spring 6 so that the upper half 1 is moved to the lower half. When the lid 5 is rotated in the opening direction, the brake member 3 surely slides in the direction of the brake release position even when the lid 5 is rotated in the opening state, so that cassette assembly failure may occur. There is no. When using the cassette (when sliding the brake member 3 between the brake position and the brake release position)
In the above, the play of the brake member 3 is restored, and the brake member 3 can slide easily.

The present invention is not limited to the above embodiment, and the shapes of the projections and the projections may be different from those of the above embodiment. Other points are not limited at all without departing from the spirit of the present invention.

[0016]

According to the tape cassette of the present invention, at the time of assembling the cassette, the lid and the brake member are attached to the upper half, and the brake member is urged by the spring so that the upper half is not connected to the lower half. In this state, even if the lid is rotated in the opening direction, the brake member surely slides in the direction of the brake release position, so that there is no possibility that a cassette assembly failure will occur.

[Brief description of the drawings]

FIG. 1 is a plan view of an upper half of an embodiment of the tape cassette of the present invention as viewed from the inside.

2A is an enlarged plan view showing a main part of the cassette shown in FIG. 1, and FIG. 2B is a sectional view thereof.

FIG. 3 is a diagram corresponding to FIG. 2A when the cassette of the embodiment shown in FIG. 1 is used.

FIG. 4 is a diagram corresponding to FIG. 1 in a conventional tape cassette.

5 (a) and 5 (b) are diagrams corresponding to FIGS. 2 (a) and 2 (b) (however, a hub ring is omitted) of a conventional tape cassette, and FIG. 5 (c) is a diagram of FIG. It is a perspective view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper half 2 Guide piece 3 Brake member 31 Projection 4 Sliding piece 41 Convex part 5 Lid 6 Spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A pair of hubs around which a magnetic tape is wound is housed in a cassette body composed of an upper half and a lower half,
A brake member that prevents rotation of the hub is engaged with a pair of sliding pieces provided on the brake member and a pair of guide pieces provided on the inner surface of the upper half, and slidably attached to the upper half. A lid for opening and closing the front end of the cassette body is rotatably attached to the front end of the upper half. The brake member is constantly urged in the direction of the brake position by the elastic force of a spring, and the lid is moved in the opening direction. A tape cassette configured to slide in the direction of the brake release position when rotated, wherein the hub is not mounted and the brake member is at a position where the brake member is most pressed by the spring; A projection is provided on a portion of the brake member located on the outer side of each of the guide pieces so as to eliminate clearance in the left-right direction for sliding the brake member. In the above-mentioned case, a tape cassette is provided with a convex portion for eliminating a vertical clearance for sliding of the brake member, at a portion of the sliding piece facing the engaging surface of the guide piece.