JPS6312469Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a tape cassette that is most suitable for application to a recording/reproducing device such as a video tape recorder, and is particularly suitable for passing a stored tape along a front opening. a cassette housing, a front lid rotatably attached to the cassette housing to cover the front side of the passed tape, and a front lid rotatably attached to the front lid to cover the rear side of the passed tape. It has a rear cover rotatably attached, a guided pin provided on the rear cover, and a guide groove provided on the cassette casing for guiding the guided pin, and the front cover is opened when the front cover is opened. When rotating in the direction of the lid, the guided pin is guided by the guide groove, so that the rear lid is moved away from the front lid while being rotated relative to the front lid, and then the lid is opened together with the front lid. This invention relates to a tape cassette configured to be rotated toward the lid.

BACKGROUND ART AND PROBLEMS A conventional tape cassette for a video tape recorder of this type is constructed as shown in FIGS. 1 to 5.

First, as shown in FIG. 1, a cassette housing 3 composed of upper and lower halves 1 and 2, a front lid 4, and a rear lid 5 are each molded from synthetic resin. Then, the magnetic tape 8 is wound around a pair of left and right reels 6 and 7.
are housed in the upper and lower halves 1 and 2, and these upper and lower halves 1 and 2 are fitted into each other from above and below and connected together with a plurality of screws 9 to form a cassette housing 3.
is configured. A front opening 10 is provided on the front surface of the cassette housing 3 over its entire length in the left and right direction, and a pair of tape guides are integrally formed on the lower half 2 at positions near both left and right ends of the front opening 10. 11, the magnetic tape 8 is passed along the front opening 10 as shown in FIGS. 2 and 4. Further, a recess 12 is formed in the cassette housing 3 on the rear side of the front opening 10 inside the pair of tape guides 11. Partition wall 1 whose planar shape is almost U-shaped
3 separates it from the inside of the cassette housing 3. Note that both the top and bottom of this recess 12 are open.

Next, the front cover 4 has a substantially U-shaped planar shape as shown in FIG. 1, and a pair of fulcrum pins 15 are integrally molded on the inside of both left and right ends 4a so as to have the same axis. There is. As shown in FIGS. 2 to 4, the front cover 4 is attached to the left and right side walls of the cassette housing 3 by its pair of fulcrum pins 15 in order to cover the front side of the magnetic tape 8 that is being passed along the front opening 10. 3a
The pin insertion hole 16 is inserted into a pair of pin insertion holes 16 provided on the front end side of the
This front cover 4 is attached to the cassette housing 3 so that it can rotate up and down about both fulcrum pins 15.

Next, as shown in FIG. 1, the rear lid 5 has an upper lid 17 integrally molded along its upper edge, and a pair of fulcrum pins are provided at approximately the center of the left and right edges of the rear lid 5 in the vertical direction. 18 are integrally molded with each other on the same axis. As shown in FIGS. 2 and 4, the rear cover 5 is arranged parallel to the front cover 4 in a recess 12 to cover the rear side of the magnetic tape 8 that is passed along the front opening 10. . The rear lid 5 has its pair of fulcrum pins 18 connected to a pair of pins of a pair of protrusions 19 integrally molded on the rear surface of the front lid 4 in the vicinity of both left and right ends 4a, as shown in FIGS. 1 and 4. The rear cover 5 is attached to the front cover 4 so as to be able to rotate up and down about both fulcrum pins 18. Furthermore, the upper lid 17
is arranged to cover the upper surface of the recess 12 as shown in FIGS. 2 and 4.

Next, as shown in FIGS. 1 and 2, the left and right end portions 13a of the partition wall 13 are opposed in parallel from the left and right directions, and the opposing surfaces of the left and right end portions 13a have a gentle S-shape. A pair of bent guide grooves 21 are provided. A pair of protrusions 22 are integrally molded on the rear surface of both left and right edges of the rear cover 5 below both fulcrum pins 18, and a pair of protrusions 22 are integrally molded on the outside of both protrusions 22 so as to be coaxial with each other. A guided pin 23 is loosely fitted into both guide grooves 21. Further, as shown in FIGS. 2 and 3, a torsion coil spring 25 is wound around the outer periphery of one of the fulcrum pins 15 between one end 4a of the front cover 4 and one side wall 3a of the cassette housing 3. Both front and rear ends 25a, 25b of the torsion coil spring 25 are engaged with protrusions 26, 27 integrally formed on the end 4a and the side wall 3a, respectively. Therefore, the torsion coil spring 25 biases the front lid 4 to rotate in the direction of the arrow a in FIG. Further, as shown in FIG. 3, a fulcrum pin 29 with a lock lever 28 integrally formed on one side wall 3a of the cassette housing 3 is provided.
It is attached so that it can freely rotate back and forth through the . The lock lever 28 is rotated in the direction of arrow b by a spring 30 attached to the side wall 3a, and is engaged with a protrusion 31 integrally formed inside one end 4a of the front cover 4. The front cover 4 is configured to be locked in the closed position.

According to the tape cassette constructed as described above, when the cassette is not in use, the front lid 4 is locked in the closed state by the lock lever 28 as shown by the solid line in FIG. 4. In this lid closed state, the magnetic tape 8 passing along the front opening 10 is covered by the front lid 4 and the rear lid 5 from the front and back, as shown by the solid line in FIG. It is a so-called completely sealed tape cassette.

Next, when the tape cassette is installed in the video tape recorder, the lock lever 28 is rotated in the direction of arrow b' by the lock release member 33 against the spring 30, as shown by the imaginary line in FIG. , front lid 4
When the lock is released, the front lid 4 is pushed up by the lid opening member 34, and the front lid 4 is pushed up approximately 90 degrees in the lid opening direction, which is the direction of arrow a', against the torsion coil spring 25. The front opening 10 is opened by being rotated by . The front cover 4 is then rotated about 90 degrees in the direction of arrow a' from the closed position shown by solid lines in FIG. 4 to the open position shown by phantom lines about both fulcrum pins 15. Therefore, since both fulcrum pins 18 of the rear lid 5 are also rotated in the same direction and at the same angle, the rear lid 5 also rotates in the same angle as the front lid 4.
At the same time, the lid is rotated from a closed position shown by a solid line in FIG. 4 to an open position shown by a phantom line. At this time, by rotating both fulcrum pins 18 in the direction of arrow a', both guided pins 23 are aligned with both guide grooves 2.
1 and moved in the direction of arrow c, and by the guiding action of both guide grooves 21, the rear cover 5 moves in the direction of arrow d with respect to the front cover 4 about both fulcrum pins 18. The lid is opened in the direction of arrow a' while being rotated in a direction to move away from the rear. When the rear lid 5 is opened, the guided pin 23 is moved into the guide groove 21 in the direction of arrow c so as to be drawn toward the side surface 36 of the guide groove 21 on the side of both fulcrum pins 18. Furthermore, when the lid is closed, the front lid 4 is rotated in the direction of the arrow a in FIG.
While being rotated in the direction d', it is moved back in the direction of the arrow a,
The guided pin 23 also moves in the direction of arrow c' within the guide groove 21, and moves to the guide groove 21 shown by the solid line in FIG.
It is moved back to the lower end 21a of.

However, the conventional tape cassette constructed and operated as described above has the following defects.

That is, as shown by the solid line in FIG. 5, when the lid is closed,
By locking the front cover 4 with the lock lever 28, the positions of both fulcrum pins 18 with respect to both guide grooves 21 are fixed, and as a result, both guided pins 23 are held at the lower ends 21a of both guide grooves 21. As a result, the rear cover 5 is held in the closed position.
However, the cassette housing 3 and both lids 4 and 5 are both molded from synthetic resin, and there are molding errors in each of them. For this reason, the looseness in the radial direction of both fulcrum pins 18 in both pin insertion holes 20 and the looseness in the groove width direction (direction perpendicular to the longitudinal direction) of the guide groove 21 of both guided pins 23 is suppressed. Therefore, both guided pins 23 can rotate slightly in the direction of arrow e around both fulcrum pins 18 at the lower ends 21a of both guide grooves 21. As a result, when the rear lid 5 is pushed in the direction of arrow A in FIG. 5 from both fulcrum pins 18 in the closed lid state, the rear lid 5 is pushed on both sides relative to the front lid 4 as shown by the imaginary line in FIG. There was a defect in which it rotated slightly in the direction of arrow d about the fulcrum pin 18 and opened. Note that due to the looseness of both fulcrum pins 15 in both pin insertion holes 16 and the looseness when the lock lever 28 is engaged with the protrusion 31,
If the front lid 4 wobbles in the closed state, the wobbling of the rear lid 5 will be further magnified, and the rear lid 5 will more easily rotate and open in the closed state.

Purpose of the invention The present invention aims to provide a tape cassette capable of correcting the above-mentioned defects.

Summary of the Invention The present invention relates to the above-mentioned tape cassette,
This tape cassette has a protrusion on the side near the bottom end within the guide groove to regulate the position of the guided pin to prevent the rear lid from rotating open in the direction of arrow d in Figure 5 relative to the front lid when the front and rear lids are in the closed state.

Embodiment An embodiment of the present invention applied to a tape cassette for a video tape recorder will be described below with reference to FIGS. 6 to 11. Note that the same structural parts as those of the conventional example shown in FIGS. 1 to 5 are given the same reference numerals, and the explanation thereof will be omitted. In addition, both ends 1 of the partition wall 13 are shown here.
3a, a pair of left and right fulcrum pins 18, a guide groove 21,
Although only one of the projecting piece 22 and the guided pin 23 will be explained, the same applies to the other one.

First of all, FIGS. 6 and 7 show the first embodiment, and in this case, an elastic force is applied to the side surface 37 on the opposite side to the fulcrum pin 18 at a position near the lower end 21a of the guide groove 21. The protrusion 38 having the cassette housing 3
It is provided by integral molding. Note that the end portion 13a of the partition wall 13 forming the guide groove 21 is composed of wall bodies 39 and 40 that are integrally molded with the upper and lower halves 1 and 2, respectively, and are connected to each other from the front and back directions.
A guide groove 21 is provided at the joint between these two wall bodies 39 and 40.
is formed. In this case, an elastic protrusion 38 is integrally molded on the wall 40 on the lower half 2 side, and the protrusion 38 is inserted into the connecting portion with the wall 40 from the return position shown by the solid line in FIG. 41 as a fulcrum, as shown by an imaginary line, it is configured to be able to bend in the direction of arrow f against elasticity.

Next, according to the first embodiment, when the rear cover 5 is moved back from the open position shown by the imaginary line in FIG. 6 to the closed position shown by the solid line, the guide groove 21 The guided pin 23, which has been moved in the direction of arrow c' along The guided pin 23 is returned to the lower end 21a of the guide groove 21. Then, the guided pin 23 is moved back to the lower end 21a of the guide groove 21, and the protrusion 38 is returned to the position indicated by the solid line.
The guide groove 21 acts to press against the lower end 21a of the guide groove 21.

As a result of the above, when the rear lid 5 is in the closed state, even if the guided pin 23 tries to rotate in the direction of the arrow e around the fulcrum pin 18, the protrusion 38 prevents the guided pin 23 from rotating in the direction of the arrow e. The guided pin 23 is securely regulated in position by the lower end 21a of the guide groove 21, and the rear cover 5 is moved relative to the front cover 4 as shown by the imaginary line in FIG. Fulcrum pin 1
It is reliably prevented from rotating in the direction of arrow d about 8 and opening.

Note that when the rear cover 5 is opened, the guided pin 23 touches the fulcrum pin 18 of the guide groove 21 as described in FIG.
Since the protrusion 38 is moved in the direction of the arrow c so that it is pulled toward the side surface 36, the protrusion 38 hardly interferes with the movement of the guided pin 23 in the direction of the arrow c. It is pushed to some extent by the guide pin 23 and flexes to some extent in the direction of arrow f against elasticity.

Next, FIG. 8 shows a second embodiment. In this case, a spring member 43 made of metal, plastic, etc., and processed separately from the cassette housing 3, is
This is a replacement for the elastic protrusion 38 shown in the first embodiment. Note that this spring member 43 is fixed, for example, by inserting one end 43a into the wall 40, and the other end 43b is loosely fitted into a slit 44 provided in the wall 40. It operates in the same manner as the protrusion 38 of the embodiment.

Next, FIG. 9 shows a third embodiment, in which a side surface 37 opposite to the fulcrum pin 18 side is located near the lower end 21a of the guide groove 21.
A protrusion 45 having no elasticity is provided integrally with the wall body 40, and the protrusion 45 is opposed to the protrusion 45.
A protrusion 46 having the same elasticity as the protrusion 38 is provided on the side surface 36 of the guide groove 21 on the fulcrum pin 18 side by being integrally molded with the wall body 39.

According to this third embodiment, when the rear lid 5 is in the closed state, the guided pin 23 is attached to the elastic protrusion 4.
6, the guided pin 2 is lightly elastically pressed and fixed to the non-elastic protrusion 45 side.
3 is reliably positioned at the lower end 21a of the guide groove 21, and the guided pin 23 does not wobble within the lower end 21a. When the guided pin 23 attempts to rotate in the direction of the arrow e around the fulcrum pin 18, the inelastic protrusion 45 ensures that the guided pin 23 does not rotate in the direction of the arrow e. In order to prevent
It is reliably prevented from rotating and opening in the direction of arrow d around .

Note that when the rear cover 5 is opened, the guided pin 23 touches the fulcrum pin 18 of the guide groove 21 as described in FIG.
Since the guide pin 23 is moved in the direction of the arrow c while being pulled toward the side surface 36, the guided pin 23 has no elasticity while slightly bending the protrusion 46, which has elasticity, in the direction of the arrow g against the elasticity. It escapes from the protrusion 45 and moves in the direction of arrow c.

FIG. 10 shows the fourth embodiment,
In this case, the elastic protrusion 46 shown in the third embodiment is omitted and only the non-elastic protrusion 45 is provided, and the purpose can be achieved even with this protrusion 45 alone. be.

Next, FIG. 11 shows a fifth embodiment. In this case, a sphere 48 made of metal, plastic, etc. separately from the cassette housing 3 is used as the elastic material shown in the fourth embodiment. The projection 45 is replaced with a projection 45 which does not have a spherical shape, and this spherical body 48 is rotatably attached to the joining portion of the walls 39 and 40.

Application Example Although one embodiment of the present invention has been described above, the present invention can be applied to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

Effects of the invention As described above, the present invention regulates the position of the guided pin by the protrusion provided on the side surface near the lower end of the guide groove, so that when the front cover and the rear cover are in the closed state, the rear cover is It is configured to prevent the front lid from rotating and opening, and although it has a very simple structure, it prevents the rear lid from rotating unexpectedly when it is closed. It is possible to prevent the cassette from opening, greatly increasing the sealing performance and reliability of the cassette.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view illustrating a conventional example of a tape cassette for a video tape recorder, Fig. 2 is a plan view of the same completed assembly, and Fig. 3 is Fig. 2-
FIG. 4 is an enlarged sectional view taken along the lines of FIG. 2, and FIG. 5 is a sectional view similar to FIG. 4 explaining the opening operation of the rear lid. Figures 6 to 11
The figures show an embodiment of a tape cassette for a video tape recorder to which the present invention is applied, in which FIG. 6 is an enlarged sectional view of the main part showing the first embodiment, and FIG. 8 is an enlarged sectional view of the main parts showing the second embodiment, FIG. 9 is an enlarged sectional view of the main parts showing the third embodiment, and FIG. 10 is the fourth embodiment. Figure 11 is an enlarged sectional view of the main parts shown in Figure 5.
FIG. 2 is an enlarged cross-sectional view of main parts showing an example. In addition, in the symbols used in the drawings, 3...Cassette housing, 4...Front cover, 5...Rear cover, 6, 7...
... Reel, 8 ... Magnetic tape, 10 ... Front opening, 13 ... Partition wall, 13a ... Both ends of partition wall, 15 ... Fulcrum pin, 16 ... Pin insertion hole, 1
8...Fully pin, 20...Pin insertion hole, 21...
Guide groove, 21a...lower end of guide groove, 23...
... Guided pin, 25 ... Torsion coil spring, 36
...Side surface of the guide groove, 37...Side surface of the guide groove,
38...Protrusion having elasticity, 43...Spring member,
45...Protrusion without elasticity, 46...Protrusion with elasticity, 49...Spherical body.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A cassette casing in which a stored tape is passed along the front opening, and a cassette casing rotatably attached to the cassette casing to cover the front side of the passed tape. a front lid, a rear lid rotatably attached to the front lid to cover the rear side of the passed tape, a guided pin provided on the rear lid, and a guided pin for guiding the guided pin. and a guide groove provided in the cassette case, and when the front cover is rotated in the opening direction, the guided pin is guided by the guide groove to move the rear cover to the rear of the front cover. In the tape cassette, the tape cassette is configured such that the front cover is rotated to separate the tape cassette from the front cover, and then the front cover is rotated together with the front cover in the opening direction. A tape cassette, characterized in that a projection is provided on a side surface near the lower end of the guide groove for regulating the position of the guided pin in order to prevent the lid from rotating relative to the front lid and opening. 2. The tape cassette according to claim 1, wherein the protrusion is an elastic protrusion. 3. The tape cassette according to claim 1, wherein another elastic projection is provided in the guide groove to face the projection. 4. The tape cassette according to claim 1, wherein the protrusion is made of a separate member from the cassette housing. 5. The tape cassette according to claim 2 or 3, wherein the elastic protrusion is formed of a separate member from the cassette housing.