KR900009373Y1 - Tape cassette - Google Patents

Abstract

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Description

Tape cassette

1 is an exploded perspective view illustrating a conventional example of a tape cassette for a video tape recorder.

2 is a plan view of the assembled state.

3 is an enlarged side view of the line III-III of FIG. 2;

4 is an enlarged sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a cross-sectional view of the form similar to fourth view illustrating the operation of opening the back cover. FIG.

6 is an enlarged cross-sectional view of a main portion showing an embodiment of a tape cassette for a video tape recorder to which the present invention is applied.

* Explanation of symbols for main parts of the drawings

3: cassette box 4: front cover

5: back cover 6,7: reel

8: magnetic tape 10: front opening

13: partition wall 13a: both ends of a partition wall

15, 18: point pin 16,20: pin insertion hole

21: guide groove 21a: the lower portion of the guide groove

23: guide pin 25: torsion coil spring

37: side of the rear side of the guide groove 38: recess

The present invention is a tape cassette most suitable for application to a recording and reproducing apparatus such as, for example, a video tape recorder, in particular a cassette box formed by passing a received tape along the front opening, and to cover the back side of the passed tape. A back cover attached to the front cover so as to rotate, a guide pin installed on the back cover, and a guide groove formed in the cassette box to guide the guide pin, the cover of the front cover being opened A tape configured to rotate the back cover together with the front cover in the direction of opening the cover while rotating the back cover to the rear of the front cover by guiding the guide pin to the guide groove at the time of rotation. Relates to a cassette.

A kind of tape cassette for a video tape recorder of this kind is configured as shown in Figs.

First, as shown in FIG. 1, the cassette box 3 constituted by the upper and lower halves 1 and 2, and the front cover 4 and the rear cover 5 are each formed of synthetic resin. Then, the magnetic tape 8 is housed in the upper and lower halves 1 and 2 by being wound around a pair of left and right reels 6 and 7, and the upper and lower halves 1 and 2 are moved from top to bottom. The cassette box body 3 is constituted by being fitted together and integrally coupled by a plurality of screws 9. The front face of the cassette box 3 is formed with a front opening 10 over the entire length in the left and right direction, and integrally molded to the lower half 2 at positions near the left and right ends of the front opening 10. Guided by a pair of tape guides 11, the magnetic tape 8 passes along the front opening 10 as shown in FIG. 2 and FIG.

Moreover, recessed part 12 is formed in the cassette box 3 from the inside of a pair of tape guides 11 to the back side of the front opening 10, and this recessed part 12 has both tape guides ( 11), the planar shape formed integrally with the upper and lower halves 1, 2 is partitioned with the inside of the cassette box 3 by the partition wall 13 having a substantially "c" shape. And all of the upper and lower sides of this recessed part 12 are open.

Next, as shown in FIG. 1, the front cover 4 has a substantially "c" shape in a planar shape, and a pair of point pins 15 are co-lateral with each other inside the left and right ends 4a. It is molded integrally with the furnace. Then, as shown in FIGS. 2 to 4, the front cover 4 has a pair of point pins 15 cassetteed so as to cover the front side of the magnetic tape 8 passing along the front opening 10. The front cover 4 is inserted into and attached to a pair of pin insertion holes 16 provided in the same axis state on the front and rear sides of the left and right side walls 3a of the box 3, and the front cover 4 is a double point pin 15. It is attached to the cassette box 3 so that it can rotate up and down centering.

Next, as shown in FIG. 1, the top cover 17 is integrally formed in the back cover 5 according to the upper edge thereof, and is substantially centered in the vertical direction at the left and right end edges of the back cover 5. The pair of point pins 18 are integrally formed in the same axis state with each other. Then, as shown in Figs. 2 and 4, the back cover 5 has a front cover 4 in the recess 12 so as to cover the rear side of the magnetic tape 8 passing along the front opening 10. Are arranged in parallel. The back cover 5 integrally couples the pair of point pins 18 at positions adjacent to the left and right ends 4a at the rear of the front cover 4 as shown in FIGS. 1 and 4. It is inserted into and attached to the pair of pin insertion holes 20 of the formed pair of protruding pieces 19, and the cover 5 is rotated up and down about the two point pins 18 so that the front cover 4 ) Is attached. The top cover 17 is disposed to cover the top surface of the recess 12 as shown in FIGS. 2 and 4.

Next, as shown in FIGS. 1 and 2, the left and right both ends 13a of the partition wall 13 face each other in parallel in the left and right directions, and the opposite surfaces of the left and right both ends 13a are substantially S-shaped. A pair of guide grooves 21 gently bent are formed. In addition, a pair of protrusion pieces 22 are integrally formed below both point pins 18 at the rear of the left and right end edges of the rear cover 5, and the same axis line is formed on both outside of the protrusion pieces 22. A pair of guide pins 23 integrally molded in a state are inserted into both guide grooves 21 with a margin. In addition, as shown in FIGS. 2 and 3, one end 4a of the front cover 4 and one side wall 3a of the cassette box 3 are formed at the outer circumference of the one branch pin 15. The torsion coil spring 25 is wound between the projections 26 and the projections 26 in which both front and rear ends 25a and 25b of the torsion coil spring 25 are integrally formed on the end portion 4a and the side wall 3a. And (27), respectively. Accordingly, the torsion coil spring 25 is pivoted in the direction of closing the cover in the direction of arrow a in FIG. 3.

Moreover, as shown in FIG. 3, the lock lever 28 is attached to one side wall 3a of the cassette box 3 so that it can rotate back and forth via the branch pin 29 integrally formed with it. Then, the lock lever 28 is pivoted in the direction of the arrow b by the spring 30 attached to the side wall 3a, and is engaged with the projection 31 integrally formed inside the foot end 4a of the front cover. The front cover 4 is configured to be locked at the position where the cover is closed.

According to the tape cassette configured as described above, when the cassette is not used first, the front cover 4 is locked with the cover closed with the lock lever 28 as shown by the solid line in FIG. In the closed state, as shown by the solid line in FIG. 4, the magnetic tape 8 passing along the front opening 10 is surrounded by the front cover 4 and the rear cover 5 from front to back. They are laid out in a so-called fully sealed tape cassette.

Next, when the tape cassette is mounted on the video tape recorder, the lock lever 28 is driven against the spring 30 by the unlocking member 33 as shown in the phantom line in FIG. In the direction of ', the front cover 4 is unlocked and at the same time the front cover 4 is pushed by the opening member 34 and against the front cover 4 torsion coil spring 25 arrow a The front opening 10 is opened by being rotated approximately 90 degrees in the direction of opening the cover in the 'direction. Then, the front cover 4 is rotated approximately 90 DEG C in the direction of the arrow a 'from the position of closing the cover shown by the solid line in FIG. Since both pins 18 of the rear cover 5 are rotated at the same angle in the same direction, the rear cover 5 together with the front cover 4 is moved from the position of closing the cover shown in FIG. It rotates to the position which shows the cover shown.

At this time, both of the point pins 18 are rotated in the direction of the arrow a ', so that both guide pins 23 are guided to both of the guide grooves 21 and moved in the direction of the arrow c. By the guiding action of the back cover (5) is rotated in the direction away from the front cover (4) in the direction of the arrow d with respect to the front cover (4) around the two point pins 18 in the direction of the arrow a ' Opens. And when this cover 5 is opened, the guide pin 23 moves to the side surface 36 of the front side which is the side surface of the both point pin 18 side of the guide groove 21. As shown in FIG. In addition, when the cover is closed, the front cover 4 is rotated in the direction of arrow a in FIG. 4 in the reverse operation when the cover is opened, so that the rear cover 5 is rotated in the direction of the arrow d 'with respect to the front cover 4. It doubles in the direction of arrow a, and moves inside the guide groove 21 in the direction of arrow c 'and doubles to the lower end 21a of the guide groove 21 shown by solid lines in FIG.

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

That is, in the state in which the cover shown by the solid line in FIG. 5 is closed, the front cover 4 is pressed to the rear side as shown by arrow A, and the back cover 5 is moved to the rear side by the front cover 4. When pressed, both guide pins 23 are pressed to the side face 37 on the rear side, which is the side opposite to the two point pins 18 of the both guide grooves 21. Then, by the guiding action by the side surface 37, the pressure-bearing force of the guide pin 23 upwards in the direction of arrow c in FIG. 5 acts, so that the back cover 5 is moved to the virtual line in FIG. As shown in the drawing, there was a defect in which the front cover 4 was rotated unintentionally slightly upwards in the direction of the arrow d about both the pins 18.

It is an object of the present invention to provide a tape cassette capable of correcting a defect as described above.

In the above-described tape cassette, in the tape cassette, the recess is formed in the lower end of the side of the rear side of the genital guide groove, and the front cover in the closed state is pressed by the rear side, and the back cover is covered by the front cover. When the dog is pushed to the rear side, the guide pin pressed to the rear side enters the recess, and the tape guide pin is moved upwards to prevent its back cover from sliding open against the front cover, and the lid Even if the front cover is pressed to the rear side in the closed state, it is possible to prevent the back cover from opening unexpectedly.

Next, an embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described with reference to FIG.

Incidentally, the same structural units as in the conventional example shown in Figs. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted. In addition, although only one of the both ends 13a of the partition wall 13, a pair of right and left point pins 18, the guide flaw 21, the protrusion piece 22, and the guide pin 23 is demonstrated here, the other Do it entirely.

That is, the present invention is to form a recessed portion 38 through which the guide pin 23 can enter the lower end portion 21a of the rear side side 37 of the guide groove 21.

Thus, according to the tape cassette of the present invention in which the recessed part 38 is formed, the cover shown by the solid line in FIG. 6 is closed, and the front cover 4 is pressured to the rear side as shown by arrow A, When the back cover 5 is pushed to the rear side by the front cover 4, the guide pin 23 enters into the recessed portion 38, as shown by an imaginary line in FIG.

As a result, the back cover 5 is pressed by the front cover 4 as shown by the virtual line in FIG. 6 and only moved in parallel in the direction of the arrow A, and is shown by the virtual line in FIG. As described above, the guide pin 23 is reliably prevented from opening upward in the direction of the arrow c by the guiding action of the rear side side 37 of the guide groove 21.

And in the tape cassette of this invention, it is necessary to determine the height B dimension of the recessed part 38, and the radius C dimension of the guide pin 23 in relationship of B> C.

When opening the rear cover 5, the guide pin 23 is pulled toward the side surface 36 of the front side of the guide groove 21 to move toward the arrow C as shown in FIG. For this reason, the guide pin 23 is not engaged with the recessed part 38 at all, and the guide pin 23 smoothly moves in the arrow C direction.

Although one embodiment of the present invention has been described above, the present invention can be applied to a tape cassette for various recording and reproducing apparatuses and other various information processing apparatuses other than a video tape recorder.

As described above, the present invention forms a recess in the lower end of the rear side of the guide flaw, and when the rear cover is pushed to the rear side through the front cover, the guide pin of the rear cover enters the recess so that the rear of the guide flaw Since the guide force of the guide pin by the side of the side prevents the pressing component from developing upward on the rear cover, when the rear cover is pressed to the rear side through the front cover as described above, the rear cover is the front side. The cover can be pivoted upwards to reliably prevent accidental opening. Furthermore, the structure merely forms recesses in the lower end portions of the rear side surfaces of the guide grooves, and the resin processing of the cassette box body can be performed in the same manner as before, and the cost is not increased at all.

Claims (1)

A cassette box 3 which passes the stored tape along the front opening, a front cover 4 attached to the cassette box so as to cover the front side of the passed tape, and the path A back cover 5 attached to the front cover so as to cover the rear side of the tape, and a guide pin installed on the back cover and the guide pin 33 formed on the cassette box body. It has a guide groove 21, and the outer cover with respect to the front cover to guide the guide pin to the guide groove 21 when the cover of the front cover in the opening direction to separate the rear cover to the rear of the front cover In the tape cassette configured to rotate the back cover in the direction of opening the cover together with the front cover, the recess is formed in the lower end of the rear side of the guide groove, When the front cover in the closed state is pressed against the rear side, and the upper cover is pushed to the rear side by the front cover, the guide pin pressed to the rear side enters the recessed portion. A tape cassette, characterized in that (23) is moved upwards to prevent the back cover (5) from being rotated and opened against the front cover (4).