JPH0142872Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a novel tape cassette. More specifically, regarding a tape cassette equipped with a tape loosening prevention piece provided inside to prevent the magnetic tape from loosening, the structure of the mounting part to which the tape loosening prevention piece is attached is simple, and the tape cassette is equipped with a tape loosening prevention piece that is installed to prevent tape loosening. It is an object of the present invention to provide a novel tape cassette in which the pieces can be reliably attached to predetermined positions on the attaching part and the attaching work can be easily performed.

BACKGROUND TECHNOLOGY AND PROBLEMS Generally, in a tape cassette that stores magnetic tape, etc., appropriate measures are taken to prevent the part of the tape stored in the cassette case or the part pulled out to the front of the cassette case from loosening. A tape loosening prevention member is provided. This tape loosening prevention member is made of a highly elastic sheet material, and its base end is supported by the cassette case.
The tape guide member is installed in the cassette case so that its leading end comes into elastic contact with the side surface of the tape guide member.

1 and 2 show an example of a conventional tape cassette.

In the figure, a denotes a tape cassette, and two tape reels f and g are arranged in a cassette case d consisting of an upper half b and a lower half c, each winding a magnetic tape e from both ends.
Reference character h is a cover that can be opened and closed to cover the front surface of the tape drawer of the cassette case d. One of the tape reels f and g is a tape supply reel, and the other g
becomes the tape take-up reel. The magnetic tape e pulled out from the supply reel f is led out of the cassette case d through a tape drawer opening i formed near one edge of the front surface of the cassette case d, and is drawn out from the tape drawer opening i formed near one edge of the front surface of the cassette case d. The tape is introduced into the cassette case d through the tape drawer opening j formed at the position , and is wound onto the take-up reel g. K and l are tape guide posts provided near the other openings of each of the openings i and j. Further, m and n are guide pins, respectively, guide pin m is provided between the above one opening i and the supply reel f, and guide pin n is provided between the above other opening j and the take-up reel g. is provided in between.
The magnetic tape e pulled out from the supply reel f first comes into contact with the outer circumferential surface of the guide pin m on the take-up reel side, and is guided from there in the direction where the guide post k is located, and is guided to the opposite side of the take-up reel of the guide post k. It is led out from the opening i into the cassette case d along the outer peripheral surface of the other guide post, and introduced into the cassette case d from the opening i along the outer peripheral surface of the other guide post on the side opposite to the supply reel. It is wound along the outer peripheral surface of the supply reel side and then wound onto the take-up reel g.

o is a tape loosening prevention piece, which is formed into a substantially rectangular sheet shape from a highly elastic material. p is a contact piece with good sliding properties that is attached to both sides of the tip of the tape loosening prevention piece o. Also, q
is an adhesive tape material stuck to one side of the proximal end of the tape loosening prevention piece o, and adhesive is applied to both sides.

Reference numeral r denotes a tape loosening prevention piece mounting portion, which includes a mounting wall s vertically raised from the upper surface of the lower half c. The mounting wall s is located on the take-up reel side of the guide post k in the tape drawer opening i on the supply reel f side, and its wall surface extends toward the position where the guide pin m is provided. As shown by the two-dot chain line in FIG. A contact piece p attached to the guide pin m is brought into contact with the outer circumferential surface of the guide pin m on the take-up reel side.

The tip of the tape loosening prevention piece o attached to the attachment part r in this manner is brought into elastic contact with the outer circumferential surface of the guide pin m. Therefore, the portion of the magnetic tape e pulled out from the supply reel f along the outer circumferential surface of the guide pin m is lightly pressed between the outer circumferential surface of the guide pin m and the contact piece q of the tape loosening prevention piece o. Ru. However, when the magnetic tape e is stored in the cassette case d as shown in FIG. Further, when the tape cassette a is used, the tape e can be pulled out of the cassette case d from the opening i without any trouble in running.

An example of the structure for attaching the tape loosening prevention piece to the cassette case in a conventional tape cassette is as described above, but this has several problems. First, since an adhesive tape material is used to attach the tape loosening prevention piece o to the attachment part r, there is a drawback that the number of members increases. According to the attachment means using these adhesive tape materials, as the tape cassette is used for a long time, the attachment position of the tape loosening prevention piece o with respect to the attachment part r may gradually shift. The contact relationship between the tip end of the magnetic tape o and the outer circumferential surface of the guide pin m at the correct position may be disrupted, and the adhesive may spill out, which may have an adverse effect on the magnetic tape e. In addition, according to the conventional mounting structure, the mounting position and mounting condition of the tape loosening prevention piece o may vary depending on the technical ability of the worker who performs the mounting work, resulting in many variations in quality, and the installation The work itself was extremely tedious. especially,
In the case of the conventional attachment structure, it is difficult to automate the process of attaching the tape loosening prevention piece o to the attachment part r.

Purpose of the invention The present invention was devised in view of the above-mentioned problems, and allows the loosening prevention piece of the tape to be attached to a designated attachment point without using a fixing member such as adhesive, and also facilitates the attachment work. It is an object of the present invention to provide a novel tape cassette which can be used to prevent loosening of the tape and which can securely fix the loosening prevention piece of the tape to the attachment part.

Summary of the invention In order to achieve the above-mentioned purpose, the tape cassette of the invention has a mounting part provided on the cassette case,
The tape loosening prevention piece consists of a tape loosening prevention piece whose base is supported by the attachment part, and a guide pin that is in elastic contact with the tip of the tape loosening prevention piece and lightly presses the tape between it and the tip. A part of the base is formed with a cut-and-raised locking piece whose lower edge approaches the upper edge of the tape loosening prevention piece as it goes from the base to the tip. The mounting part is formed by two walls arranged so that the inner surfaces thereof face each other, and the mounting part is opened at the end on the guide pin side and at the top, into which the base of the tape loosening prevention piece is inserted. In the mounting groove, two engaging step portions are formed which face each other at both ends in the extending direction of the tape loosening prevention piece, and the proximal edge of the tape loosening preventing piece is engaged with one of the engaging step portions. The distal end edge of the locking piece of the tape loosening prevention piece is engaged with the other engagement step part, and the surface forming the mounting groove is parallel to the direction in which the tape loosening prevention piece extends. The present invention is characterized in that one of the inner surfaces of the two extending wall portions extends upward from the other to form a guide surface.

By doing so, it is possible to provide a tape cassette with a tape loosening prevention piece mounting structure that has a simple structure, allows easy installation work, and can automate the installation work. .

Embodiments Below, details of the tape cassette according to the present invention will be explained according to embodiments shown in the accompanying drawings.

3 to 6 show an example of an embodiment in which the tape cassette of the present invention is applied to a tape cassette for a video tape recorder containing a magnetic tape.

In the figure, 1 indicates a small tape cassette;
A tape cassette 1 has two tape reels each having both ends of a magnetic tape 5 wound thereon in a cassette case 4 consisting of an upper half 2 and a lower half 3. Reference numeral 6 indicates a supply tape reel which is one of the two tape reels. Reference numeral 7 denotes a recess for tape draw-out operation formed on the front surface of the cassette case 4, and the front surface of the tape draw-out operation recess 7 is covered with a cover 8 supported by the cassette case 4 so as to be openable and closable. Reference numeral 9 denotes a front wall formed in an upright manner along the front edge of the lower half 3. 1
0 is a tape drawer opening formed at a position near one side edge 11 of the front part of the cassette case 4.
Reference numeral 12 denotes a guide post that is installed at a position closer to the other tape reel of the tape drawer opening 10 of the lower half 3, that is, the take-up side tape reel. 1
Reference numeral 3 denotes a guide pin erected at a position further closer to the take-up reel than the position where the guide post 12 is erected at an intermediate position between the tape drawer opening 10 of the lower half 3 and the tape reel 6. It is. The magnetic tape 5 pulled out from the tape reel 6 is passed through a tape path as shown in FIG. That is, the magnetic tape 5 pulled out from the tape reel 6 is first passed along the outer peripheral surface of the guide pin 13 on the take-up reel side, and then moved from the part of the guide post 12 on the side opposite to the take-up reel to the part on the front side of the cassette case. It is guided out of the cassette case 4 through the opening 10 while being stretched along the cassette case 4. still,
The magnetic tape 5 led out of the cassette case 4 is introduced into the cassette case 4 through a tape drawer opening (not shown) formed on the other side of the front surface of the cassette case 4, and is wound onto a take-up reel (not shown).

14 is a tape loosening prevention piece. The tape loosening prevention piece 14 is made of a relatively elastic material such as polyethylene terephthalate, and is formed into a substantially rectangular sheet shape. An example of a method for manufacturing the tape loosening prevention piece 14 will be described in detail later. Reference numeral 15 denotes a hole formed by cutting out the middle portion of the tape loosening preventing piece 14 in the longitudinal direction in order to increase the flexibility of the tape loosening preventing piece 14. 1
6 is a locking piece formed at the base of the tape loosening prevention piece 14. The locking piece 16 is the tape loosening prevention piece 14
It is formed by cutting and bending a part of the base sideways, and its lower edge 17 is an inclined edge that gradually approaches the upper edge of the tape loosening prevention piece 14 from the base to the tip. . The shape of the lower end inclined edge 17 of this locking piece 16 may be an inclined edge extending linearly as shown in the figure, or in some cases, it may be an inclined edge extending in a downwardly convex arc shape. Okay. Reference numeral 18 denotes contact pieces provided on both sides of the tip of the tape loosening prevention piece 14. Contact piece 18
is a thin film made of a material with a low coefficient of friction, such as tetrafluoroethylene, and attached to both sides of the tip of the tape loosening prevention piece 14 using an adhesive, adhesive material, adhesive tape, or other adhesive. has been done. Thus, the tape loosening prevention piece 14 is attached to a predetermined position of the cassette case 4 by having its base supported by an attachment portion to be described later. The tape loosening prevention piece 14 is made of a material that has a low coefficient of friction and is elastic, such as high-density polyethylene (high-molecular polyethylene) or a fluorine compound (for example, ethylene-4-fluorinated ethylene copolymer or a material in which carbon is added thereto). If the contact piece 18 is made of a certain material, the contact piece 18 described above becomes unnecessary.

Reference numeral 19 denotes a tape loosening prevention piece attachment portion. The tape loosening prevention piece attachment part 19 is attached to the tape drawer opening 1.
0, and is formed integrally with the lower half 3 in this embodiment.
20 and 21 are wall portions forming the mounting portion 19;
The outer surfaces of the wall portions 20 and 21 are approximately V-shaped when viewed from above, and the two wall portions 20 and 21 are connected at the bending point of the V-shape.

22 is a mounting groove formed by the walls 20 and 21, and the base end of the mounting groove 22, that is, the end on the front side of the cassette case 4 is connected to the connected portion of the walls 20 and 21. The front end, that is, the end facing the rear of the cassette case 4 is opened at the V-shaped open side of the walls 20 and 21, and this mounting groove 22 is connected to the guide pin 13. It is formed in a direction extending toward.

The tape loosening prevention piece 14 is provided on the inner surface of the wall portion 20.
Support surfaces 23 and 24 are formed to support the side surfaces of the base. That is, on the surface of the wall portion 20 facing the wall 21, there is a recess 25 extending vertically in the intermediate portion thereof.
are formed, and both sides of the recess 25 are used as support surfaces 23 and 24. And the support surface 23 on the base side
An engaging stepped portion 26 is formed continuously at the base end edge of the engaging step portion 26, which is bent at a right angle toward the wall 21 side. Further, a recess 27 is formed on the inner surface of the wall 21, and the back surface of the recess 27 extends parallel to the support surfaces 23 and 24 formed on the wall 20, and the front portion is formed on the wall 20. The support surface 23 is formed further forward than the supporting surface 23. Then, an engagement step portion 28 that is continuous with the front end of the recessed portion 27 and bent at a right angle toward the wall 20 side.
is formed. And the wall portion 20 is the wall portion 21
extending upwards and therefore supporting surfaces 23,2
4 extends above the upper end surface of the wall portion 21, and the upwardly extending portions form guide surfaces 29, 29 for guiding the insertion of the tape loosening prevention piece 14 into the mounting groove 22. There is.

Reference numeral 30 denotes a protrusion formed to connect the lower ends of the walls 20 and 21, and the upper surface of the protrusion 30 constitutes the bottom of the mounting groove 22.

Thus, the tape loosening prevention piece 14 has its base inserted into the mounting groove 22 formed in the mounting portion 19, and is thereby supported by the mounting portion 19.

Next, a process of attaching the tape loosening prevention piece 14 to the attachment part 19 will be explained. First, the attachment position of the tape loosening prevention piece 14 to the attachment portion 19 is determined. In this positioning, one side of the base of the tape loosening prevention piece 14, that is, the side opposite to the side where the locking piece 16 is cut and raised, is brought into contact with the guide surfaces 29, 29 on the upper part of the support surfaces 23, 24. and engage the proximal edge with the engagement step 26 on the wall 20 side, and also engage the other side of the tip of the tape loosening prevention piece 14, that is, the side where the locking piece 16 is cut and raised. This is done by bringing the side surface into contact with the outer peripheral surface of the guide pin 13 on the take-up reel side. The tape loosening prevention piece 14, which has been positioned for attachment in this manner, is brought into a state in which the inclined edge 17 at the lower end of the locking piece 16 is in contact with the upper edge 27a of the recess 27. Then, the tape loosening prevention piece 14 positioned in this way is pressed from above, so that the lower edge of the base is moved to the attachment part 19.
the mounting groove 2 until it abuts against the top surface of the protrusion 30.
It is inserted into 2. The tape loosening prevention piece 14 inserted into the mounting groove 22 is lowered while one side of its base slides in sliding contact with the support surfaces 23 and 24, and at the same time, the locking piece 16 is moved down to the inclined edge 17 at the lower end.
is moved in sliding contact with the upper edge 27a of the recess 27, and when it is no longer in contact with the upper edge 27a of the recess 27, the leading edge of the locking piece 16 touches the engagement step 2.
8 on the recess 27 side.
That is, in the process of inserting the base of the tape loosening prevention piece 14 into the mounting groove 22, the locking piece 16 is pressed so that its cut-and-raised angle becomes smaller than the initial cut-and-raised angle. Mounting groove 2
Resilient force is stored in the locking piece 16 housed within 2. Thus, when the lower end edge of the base of the tape loosening prevention piece 14 abuts against the upper surface of the protrusion 30 of the attachment part 19,
The tape loosening prevention piece 14 is attached to the attachment part 19 in the state shown in FIG. The tape loosening prevention piece 14 attached in this way has one side of the base pressed against the support surfaces 23 and 24 by the above-mentioned elastic force stored in the locking piece 16, and the base end edge is pressed against the support surfaces 23 and 24. The locking piece 16 is also attached to one of the engagement step portions 26.
The leading edge of each of the two engagement steps 28 is engaged with the other engaging step portion 28, respectively. As a result, the base of the tape loosening preventing piece 14 inserted into the mounting groove 22 is stably supported by the mounting portion 19, and the tip of the tape loosening preventing piece 14 is brought into elastic contact with the guide pin 13.

Thus, the magnetic tape 5 pulled out from the supply tape reel 6 is lightly pressed between the outer peripheral surface of the guide pin 13 and the contact piece 18 of the tape loosening prevention piece 14, and thereby the magnetic tape 5 is tape 5
can be prevented from being unnecessarily relaxed.

Next, an example of a method for manufacturing the tape loosening prevention piece 14 described above will be explained with reference to FIG.

Reference numeral 31 is a sheet material made of the above-mentioned elastic material formed into a band shape, and is continuously fed out from a molding machine.

A contact piece 32 is attached to the sheet material 31 fed out from the molding machine by an adhesive machine. This contact piece 3
2 is made of a material with a low coefficient of friction such as the above-mentioned tetrofluoroethylene formed into a thin skin shape, and the one end edge is formed in a U-shape on both sides along one end edge of the sheet material 31 that is passed through the adhesive machine. It is glued by sandwiching it in a shape. Sheet material 3 made in this way
1 is then passed through a suitable press or punching machine, where the openings 15, 15, ... are punched out, the engaging pieces 16, 16, ... are cut and bent, and each unit is 1 tape loosening prevention piece 1
4, 14, ... cut section 3 that becomes the separation point
3, 33,... are formed. Then, the sheet material 31 formed in this manner is cut off using an appropriate cutting machine or hand scissors to form each single tape loosening prevention piece 14, 14, . . .

In the above-mentioned embodiment, the two opposing surfaces forming the mounting groove were formed corresponding to substantially the entire area of both side surfaces of the base of the tape loosening prevention piece, but the two opposing surfaces in the mounting structure of the present invention are may be formed at least at both ends of the base of the tape relaxation prevention piece in the direction in which the tape relaxation prevention piece extends. Therefore, the mounting groove may be open at both ends in the direction in which the groove extends.

Effects of the Invention As is clear from the above description, the tape cassette according to the present invention includes a mounting portion provided on the cassette case, a tape loosening prevention piece whose base is supported by the mounting portion, and a tape loosening prevention piece having a base supported by the mounting portion. The tip of the prevention piece is in elastic contact with a guide pin that lightly presses the tape between it and the tip, and a part of the base of the tape loosening prevention piece has a lower edge extending from the base to the tip. The locking piece has an inclined edge approaching the upper edge of the tape loosening prevention piece, and is formed in a cut-and-raised shape, and the attachment part is formed by two walls arranged so that the inner surfaces thereof face each other. The mounting portion has an end on the guide pin side and a mounting groove that is open at the top and into which the base of the tape loosening prevention piece is inserted, and in the mounting groove, there is a groove extending in the direction in which the tape loosening prevention piece extends. two engaging step portions facing each other at both ends are formed;
The proximal edge of the tape loosening prevention piece is engaged with one engagement step, and the distal end edge of the locking piece of the tape loosening prevention piece is engaged with the other engagement step, and the mounting groove Among the surfaces forming the tape loosening prevention piece, one of the inner surfaces of the two wall portions extending parallel to the direction in which the tape loosening prevention piece extends extends upwardly from the other to form a guide surface.

Therefore, according to the present invention, the tape loosening preventing piece can be attached to the mounting portion with an extremely simple operation of just inserting the tape loosening preventing piece into the mounting groove while aligning the base side surface of the tape loosening preventing piece along the guide surface. The loosening prevention piece can be easily attached without requiring any special skill. The mounting position of the tape loosening prevention piece attached to the mounting part in this way is determined by each part of the base of the tape loosening prevention piece being engaged with each part in the mounting groove. Therefore, unlike conventional mounting structures, there is no possibility of quality variations during the manufacturing process where the mounting position differs depending on the operator. In addition, the tape loosening prevention piece attached to the mounting part is securely prevented from coming off at its base within the mounting groove, so there is no need to use special fixing means for fixing it, reducing the number of parts. At the same time, it is possible to completely eliminate various troubles caused by adhesives that often occur in conventional mounting structures in which adhesives or the like are used for fixing. Furthermore, in the installation work of the tape loosening prevention piece in the tape cassette of the present invention, as described above, the base of the tape loosening prevention piece can be inserted while guiding the insertion direction and insertion position by the guide surface. , it can be installed mechanically using a suitable installation robot. Therefore, it is possible to automate the work of attaching the tape loosening prevention piece.

Therefore, according to the present invention, it is possible to provide a novel tape cassette having a simple structure and a tape loosening prevention piece mounting structure that is easy to work with.

[Brief explanation of the drawing]

Figures 1 and 2 show an example of the mounting structure of a tape loosening prevention piece in a conventional tape cassette.
Fig. 1 is a partially cutaway plan view of the tape cassette, Fig. 2 is an enlarged perspective view of the main parts, and Figs. 3 to 6 are implementations of the tape loosening prevention piece mounting structure in the tape cassette according to the present invention. An example is shown, and the third
The figure is a plan view of the main part with a part of the tape cassette cut away, Fig. 4 is a perspective view of the main part showing the state before the tape loosening prevention piece is attached to the mounting part, and Fig. 5 is the tape loosening prevention piece in the mounting part. FIG. 6 is a perspective view showing an example of the manufacturing process of the tape loosening prevention piece. Explanation of symbols, 4...Cassette case, 13...Guide pin, 14...Tape loosening prevention piece, 16...Locking piece, 17...Slope edge, 19...Mounting part, 20, 21...
Wall portion, 22...Mounting groove, 26, 28...Engagement step portion, 2
9...Information surface.

Claims (1)

[Claims for Utility Model Registration] An attachment part 19 provided on the cassette case 4, a tape loosening prevention piece 14 whose base is supported by the attachment part 19, and a tip end of the tape loosening prevention piece 14 in elastic contact with each other. A part of the base of the tape loosening prevention piece 14 has a lower edge that is connected to the tape loosening prevention piece 14 as it goes from the base to the tip. The locking piece 16 has an inclined edge 17 approaching the upper edge, and is formed into a cut-up shape, and the mounting part 19 is formed by two walls 20 and 21 arranged so that their inner surfaces face each other. The mounting portion 19 includes an end on the guide pin 13 side and a mounting groove 22 that is open at the top and into which the base of the tape loosening prevention piece 14 is inserted.
Two engaging step portions 26 and 28 are formed inside the tape loosening prevention piece 14, which are opposed to each other at both ends in the extending direction.
4 is engaged, and the distal end edge of the locking piece 16 of the tape loosening prevention piece 14 is engaged with the other engaging step 28, and the surface forming the mounting groove 22 is engaged with the other engaging step 28. A tape cassette characterized in that one of the inner surfaces of two wall portions 20 and 21 extending parallel to the direction in which the tape loosening prevention piece 14 extends extends upwardly from the other to form a guide surface 29.