JP3593995B2 - Tape cassette reel lock mechanism and tape cassette - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tape cassette reel lock mechanism and a tape cassette using the same. More specifically, the present invention relates to a technique for reducing the size of a tape cassette and stabilizing the operation of a reel lock.
[0002]
[Prior art]
In a tape cassette, usually, two tape reels on which a tape-shaped recording medium, for example, a magnetic tape is wound, are rotatably housed in a cassette shell.
[0003]
Some tape cassettes are provided with a reel lock mechanism that prevents rotation of the tape reel when the tape cassette is not mounted in the tape drive device, that is, when the tape cassette is not mounted. Even when the magnetic tape is applied, the magnetic tape is not loosened.
[0004]
FIGS. 1 and 2 and FIGS. 11 to 16 show an example of a tape cassette b provided with a conventional reel lock mechanism a. Although FIGS. 1 and 2 show the entire tape cassette b, they are also used in the embodiment of the present invention to be described later. Relates to the prior art.
[0005]
In the tape cassette b, two tape reels e and e, on which a magnetic tape d is wound, are rotatably housed in a cassette shell c. Are formed in large numbers (see FIGS. 13 to 16).
[0006]
The reel lock mechanism a is provided in a substantially triangular space (triangular space) surrounded by the two tape reels e and e and the back wall in the cassette shell c. A rectangular hole g is formed at a position where the lock mechanism a is located, and when the tape cassette b is mounted on the tape drive device, the insertion pin h on the device side enters the cassette shell c from the rectangular hole g. Then, the insertion pin h acts on the reel lock mechanism a to unlock the tape reels e, e (see FIGS. 13 to 16).
[0007]
The reel lock mechanism a includes a slider i, two lock pieces j, j, a lock spring k, and a slide spring 1 (see FIGS. 11 and 12).
[0008]
The slider i is movably supported in the front-rear direction within the triangular space, and support shafts m, m are provided at the rear end of the support shafts m, m so as to protrude upward from the left and right. , M, an arrangement recess n opening upward and rearward is formed (see FIGS. 11 and 12).
[0009]
A pin insertion recess o into which the insertion pin h on the device side is inserted is formed on the lower surface of the block in front of the arrangement recess n of the slider i, and a rear side edge of the pin insertion recess o goes rearward. Accordingly, a tapered surface p deviating downward is formed.
[0010]
The lock piece j is formed of a single plate-like member having a U-shape as a whole when viewed from a plane, and a cylindrical supported portion q extending perpendicular to the U-shape is integrally formed at the rear end. The front end is bent in a direction away from each other, and the front end is formed with a tapered locking claw r (see FIGS. 11 and 12).
[0011]
A spring hook s is integrally formed on the upper edge of the lock piece j at a position between the supported portion q and the locking claw r, and the lower edge of the lock piece j has the length. The front side hangs downward from substantially half of the direction, and the trailing edge of the hung portion is a cam follower t that is brought into contact with a cam portion described later to rotate the lock piece j ( 11 and 12).
[0012]
The lock portion j is rotatably supported by the supported portion q being fitted around the support shaft m of the slider i (see FIGS. 11 and 12).
[0013]
The lock piece j is provided with a detent so that the rotation of the tape reel e in the direction engaging with the engagement teeth f does not exceed a predetermined angle.
[0014]
The locking spring k is a deformed torsion spring, and includes coil portions u, u located apart from each other in the left and right, a connecting portion v connecting the coil portions u, u, and connecting portions protruding from the coil portions u, u. The locking portions w and w located outside the v are integrally formed, and the two coil portions u and u are fitted on the support shafts m and m above the supported portions q and q, respectively. The two locking portions w, w are engaged with the spring hooks s, s of the two locking pieces j, j, respectively, whereby the locking claws r, r of the locking pieces j, j are The locking claws r, r are urged to rotate in a direction in which the locking claws r, r are engaged with the engaging teeth f, f of the tape reels e, e (see FIG. 12).
[0015]
The slide spring 1 is a compression coil spring, and is contracted between the inner surface of the rear wall of the cassette shell c and the above-mentioned recessed portion n of the slider i, whereby the slider i is given a forward biasing force. (See FIGS. 13 to 16).
[0016]
At the left and right sides of the portion where the slider i is provided in the cassette shell c, ribs x, x having a short height from the bottom surface thereof are erected, and the ribs x, x are slides of the slider i when viewed from a plane. Direction, a portion slightly larger than the outer peripheral edge of the tape reels e and e, and a portion located in the movement locus of the lock pieces j and j. The portions corresponding to the cam followers t, t correspond to the cam portions y, y that regulate the rotation of the lock pieces j, j (see FIGS. 11 and 12).
[0017]
When the tape cassette b is not mounted on the tape drive, the slider i is urged forward, and the cam followers t, t of the lock pieces j, j are located at positions separated from the cam parts y, y. As a result, the locking pieces j, j are rotated in the direction in which the locking claws r, r at the tips open to each other, and are engaged with the engaging teeth f, f of the tape reels e, e. e is locked (see FIG. 13).
[0018]
In addition, since the slider i has a forward biasing force, the two tape reels e, e are both applied with rotational force in the direction in which the magnetic tape d is tensioned via the locking claws r, r. Thereby, in the reel locked state, the magnetic tape d is maintained in a tensioned state.
[0019]
Next, when the tape cassette b is mounted on the tape drive device, the insertion pin h on the device side enters the cassette shell c from the rectangular hole g of the cassette shell c, and is inserted into the taper surface p of the pin insertion recess o of the slider i. (FIG. 14).
[0020]
When the insertion pin h further enters the pin insertion recess o of the slider i, the slider i is moved backward against the elastic force of the slide spring 1 (see FIG. 15).
[0021]
Then, when the cam followers t, t of the lock pieces j, j abut on the cam portions y, y, the locking claws r, r of the lock pieces j, j are rotated in a direction approaching each other, whereby the lock piece When the locking claws r, j of j, j are separated from the tape reels e, e, the reel locked state is released, and the tape reels e, e become rotatable (see FIG. 16).
[0022]
[Problems to be solved by the invention]
The conventional reel lock mechanism a for the tape cassette b has the following two problems.
[0023]
(1) The size of the tape cassette b cannot be reduced.
{Circle over (2)} The resilience of the lock spring k cannot be reduced, and stable reel lock cannot be realized.
[0024]
First, regarding the problem (1),
When the tape cassette b is downsized, there is a problem that the reel lock mechanism a having the conventional configuration cannot be disposed in the reduced triangular space.
[0025]
That is, when the tape cassette b is reduced in size, the triangular space is naturally reduced, and the sliding range of the slider i is reduced. On the other hand, the amount of displacement of the locking claws r, r of the lock pieces j, j (the distance apart from the tape reels e, e) does not change much even when the tape cassette b becomes smaller. About the same as the amount of displacement of the locking claws r (the amount of escape from the tape reel) is required.
[0026]
Therefore, in order to make the displacement amount of the locking claw r the same even though the slide amount is reduced, the pressure angle between the cam portion y and the cam follower t must be increased. Increasing the size means that a large amount of force is required to act on the cam follower t and rotate the lock piece j, so that the slider i and the lock piece j do not move smoothly, and the tape reel e becomes stable. Cannot secure the reel lock and unreel lock operations.
[0027]
Note that the pressure angle is defined by a normal line T1 of the cam portion y at a contact portion between the cam portion y and the cam follower t and a moving direction T2 of the cam follower t (a tangential direction of the cam follower t about the rotation center O). It is a corner (see FIGS. 17 and 18).
[0028]
FIGS. 17 and 18 are schematic diagrams comparing the relationship between the sliding amount of the slider i and the pressure angle when the amount of displacement of the locking claw r of the lock piece j is constant.
[0029]
FIG. 17 schematically shows the conventional reel lock mechanism a. In the case where the slide amount of the lock piece j is “σ” and the displacement amount of the locking claw is “δ”, the cam portion The pressure angle between y and the cam follower t is “α”.
[0030]
On the other hand, FIG. 18 is based on the assumption that the slide amount of the lock piece j is reduced due to the downsizing of the tape cassette b. When the displacement amount of the locking claw r of the lock piece j remains "δ", the pressure angle between the cam portion y and the cam follower t becomes "α '".
[0031]
For this reason, if the tape cassette b is downsized and the slide amount of the lock piece j is reduced, the pressure angle between the cam portion y and the cam follower t increases (α ′> α), and the reel lock mechanism a It turns out that a smooth operation cannot be obtained or is difficult to obtain.
[0032]
Regarding the problem of (2),
The lock piece j has a cantilever shape, and when it receives an impact, it is likely to rotate around the supported portion q. Therefore, it is necessary to maintain the reel locked state with a larger force.
[0033]
That is, the lock piece j of the reel lock mechanism a has a supported portion q at one end of which is supported by the support shaft m and a locking claw r at the other end, and has a rotatable cantilever shape. Therefore, in a locked state in which the locking claw r is engaged with the engaging teeth f of the tape reel e, for example, if the tape cassette b is dropped and an impact is applied to the locking piece j, the locking piece j is The locking claw r is about to rotate around the supported portion q. When dropped, an impact of 500 G to 1000 G is usually applied, and thus a large rotating power is generated in the cantilevered lock piece j.
[0034]
Naturally, the drop of the tape cassette b is assumed at the design stage, and it is necessary to design the elasticity of the locking spring k so that the reel lock does not come off even in such a situation.
[0035]
As a result, the contact pressure between the cam portion y and the cam follower t becomes large, and the contact surfaces of the two become worn, and the wear makes the both contact surfaces rough, and furthermore, the smooth operation of the reel lock mechanism a is reduced. There is a problem of being hindered.
[0036]
In order to prevent such a situation, for example, it is conceivable to reduce the pressure angle or to reduce the material of the contact surface to a material having a small coefficient of friction. It is not possible to adopt the reverse, because the latter incurs high costs.
[0037]
Accordingly, an object of the present invention is to solve the above problems (1) and (2), to reduce the size of the tape cassette, and to stabilize the operation of the reel lock.
[0038]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the tape cassette reel lock mechanism of the present invention employs the tape reel of the tape cassette in which a tape reel having a tape-shaped recording medium wound inside a cassette shell is rotatably supported. A reel lock mechanism for locking is provided in a so-called triangular space between the two tape reels and the inner surface of the rear wall of the cassette shell, and a slider supported movably in the front-rear direction and a left and right side of the slider. Two lock pieces rotatably supported, a slide spring for pressing the slider forward, and a lock spring for urging the lock piece to rotate in a direction to engage the tape reel, The slider retreats when the tape cassette is mounted on the tape drive, and the lock piece is rotated to release the reel lock. In the reel lock mechanism, the lock piece is a front piece having a locking claw that engages with a tape reel, and is substantially opposite to the front piece about a supported portion that is pivotally supported with respect to a slider. A rear piece that extends, the rear piece of the lock piece abutting against the inner surface of the rear wall of the cassette shell when the slider retreats, and the lock piece rotates in the unlocking direction.
[0039]
Further, the tape cassette of the present invention is a tape cassette having a reel lock mechanism for locking the tape reel of a tape cassette in which a tape reel having a tape-shaped recording medium wound inside a cassette shell is rotatably supported. The reel lock mechanism is disposed in a so-called triangular space between the two tape reels and the inner surface of the back wall of the cassette shell, and is provided with a slider movably supported in the front-rear direction and a left and right side of the slider. A tape having two lock pieces movably supported, a slide spring for pressing the slider forward, and a lock spring for urging the lock pieces in a direction of engaging with the tape reel; When the cassette is mounted on the tape drive, the slider retreats, and the lock piece is rotated to release the reel lock. The lock piece has a front piece having a locking claw that engages with a tape reel, and a side substantially opposite to the front piece about a supported part that is pivotally supported with respect to a slider. And the rear piece of the lock piece abuts against the inner surface of the back wall of the cassette shell when the slider retreats, so that the lock piece rotates in the unlock direction. .
[0040]
Therefore, in the reel lock mechanism and the tape cassette of the tape reel of the present invention, the direction of the rear piece extending rearward of the lock piece from the supported portion can be relatively freely because the reel lock mechanism is provided in the triangular space. The pressure angle can be further reduced, and the operation of the reel lock mechanism can be made smoother.
[0041]
In addition, since the lock piece of the reel lock mechanism is constituted by the front piece and the rear piece extending substantially in the opposite directions about the supported portion, even if the tape cassette is dropped by mistake, the front piece and the rear piece can be used. In this case, the rotational force is generated in the opposite direction, and the rotational force is canceled out, so that the rotational force is not generated or extremely reduced as a whole of the lock piece. Can be set smaller, the contact pressure between the end of the rear piece of the lock piece and the back wall can be reduced, the wear of both contact surfaces is reduced, and the reel lock mechanism operates smoothly. Can be ensured for a long period of time, and the contact surface does not need to be made of a special material, which does not increase the cost.
[0042]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a reel lock mechanism of a tape cassette of the present invention and a tape cassette using the same will be described in detail with reference to the embodiments shown in FIGS.
[0043]
In the tape cassette 1, two tape reels 6 around which a magnetic tape 5 is wound are rotatably housed in a cassette shell 4 composed of an upper shell 2 and a lower shell 3. These tape reels 6, 6 Are formed on the outer peripheral edge of the lower flanges 6a, 6a (see FIGS. 1, 2, and 5).
[0044]
At the front end of the cassette shell 4, a front lid 8 that covers the front side of the magnetic tape 5 located along the front surface of the cassette shell 4 is rotatably supported (see FIGS. 1 and 2).
[0045]
The reel lock mechanism 9 is provided in a substantially triangular space (triangular space) 11 surrounded by the two tape reels 6 and 6 and the back wall 10 in the cassette shell 4. A rectangular hole 12 is formed at a position where the reel lock mechanism 9 is located, and when the tape cassette 1 is mounted on the tape drive, the insertion pin 13 on the apparatus side is moved from the rectangular hole 12 into the cassette shell 4. , And the insertion pin 13 acts on the reel lock mechanism 9 to unlock the tape reels 6, 6 (see FIGS. 6 to 9).
[0046]
The reel lock mechanism 9 includes a slider 14, two lock pieces 15, 15, a lock spring 16, and a slide spring 17 (see FIGS. 3 and 4).
[0047]
The slider 14 is supported by the lower shell 3 so as to be movable in the front-rear direction. Support shafts 18, 18 are provided at the rear end of the lower shell 3 so as to project leftward and rightward. An arrangement recess 19 that opens upward and rearward is formed between the openings 18 (see FIGS. 3, 4, and 5).
[0048]
A pin insertion recess 20 into which the insertion pin 13 on the apparatus side is inserted is formed on the lower surface of the block in front of the arrangement recess 19 of the slider 14, and a rear side edge of the pin insertion recess 20 goes rearward. The tapered surface 21 is formed so as to be deviated downward according to the above (see FIGS. 6 to 9).
[0049]
The two lock pieces 15, 15 have a symmetrical shape, and are generally substantially U-shaped when viewed from a plane. The parts 22 and 22 are integrally formed, and the parts (hereinafter referred to as “front side pieces”) 23 and 23 on the front side of the supported parts 22 and 22 are bent at the distal ends in a direction away from each other, and the distal ends are tapered. Formed locking claws 24, 24 are formed.
[0050]
Portions 25 of the two lock pieces 15, 15 on the rear side of the supported portion 22 (hereinafter referred to as “rear pieces”) extend diagonally rearward so as to be separated from each other, and the rear ends thereof are the rear surface of the cassette shell 4. The cam followers 26, 26 contact the wall 10 and rotate the lock pieces 15, 15 in the opposite direction, and the cam followers 26, 26 are supported by the supported portions 22, 22 of the lock pieces 15, 15 and the cam followers 26, 26. Spring catches 27, 27 are integrally formed on the upper edge thereof at a position between them (see FIGS. 3 and 4).
[0051]
The lock piece 15 is rotatably supported by the supported portion 22 being fitted around the support shaft 18 of the slider 14. As described above, the lock piece 15 pivots the supported portion 22 about the center of rotation. The front piece 23 and the rear piece 25 are formed so as to extend in substantially opposite directions (see FIG. 5).
[0052]
The lock piece 15 is provided with a rotation preventing means so that the rotation of the tape reel 6 in the direction of engaging with the engagement teeth 7 does not exceed a predetermined angle. Specifically, the slider 14 pivots at a position slightly behind the foremost end of the movement range until the tip of the locking claw 24 of the lock piece 15 contacts the outer peripheral edge of the lower flange 6a of the tape reel 6. The locking claw 24 is prevented from rotating further toward the tape reel 6 in the state shown in FIG.
[0053]
The locking spring 16 is a deformed torsion spring, and includes coil portions 28, 28 located at a distance from each other, a connecting portion 29 connecting the coil portions 28, 28, and projecting from the coil portions 28, 28. Locking portions 30, 30 located outside of 29 are integrally formed, and two coil portions 28, 28 are externally fitted to and supported on the support shafts 18, 18 above the supported portion 22. The two locking portions 30, 30 are engaged with the spring hook portions 27, 27 of the locking pieces 15, 15, respectively, so that the two locking pieces 15, 15 have their locking claws 24, 24 attached to each other. The locking claws 24, 24 are urged to rotate in a direction in which the locking claws 24, 24 are engaged with the engaging teeth 7, 7 of the tape reels 6, 6 (see FIG. 4).
[0054]
The slide spring 17 is a compression coil spring, and is contracted between the inner surface of the back wall 10 of the cassette shell 4 and the arrangement recess 19 of the slider 14, whereby the slider 14 is applied with a forward biasing force. (See FIGS. 6 to 9).
[0055]
In the rear wall 10 of the cassette shell 4, the left and right sides of the portion corresponding to the slider 14 are portions where the cam followers 26, 26 of the lock pieces 15, 15 abut and slide. , 15 are cam portions 31, 31 for restricting rotation.
[0056]
When the tape cassette 1 is not mounted on the tape drive device, the slider 14 is urged forward, and the cam followers 26, 26 of the lock pieces 15, 15 are separated from the cam portions 31, 31, respectively. As a result, the lock pieces 15, 15 are rotated in the direction in which the locking claws 24, 24 at the tips open, and are engaged with the engaging teeth 7, 7 of the tape reels 6, 6, so that the tape reels 6, 6 (See FIG. 6).
[0057]
In addition, since the slider 14 has a forward biasing force, the two tape reels 6, 6 are both provided with rotational force in the direction in which the magnetic tape 5 is tensioned via the locking claws 24, 24. Thus, in the reel locked state, the magnetic tape 5 is maintained in a tensioned state (see FIG. 6).
[0058]
Next, when the tape cassette 1 is mounted on the tape drive device, the insertion pin 13 of the device enters the cassette shell 4 from the rectangular hole 12 of the cassette shell 4 and enters the tapered surface 21 of the pin insertion recess 20 of the slider 14. Abut (see FIG. 7).
[0059]
When the insertion pin 13 further enters the pin insertion recess 20 of the slider 14, the slider 14 is moved rearward against the elastic force of the slide spring 17 (see FIG. 8).
[0060]
Then, when the cam follower 26 of the lock piece 15 comes into contact with the cam portion 31 of the rear wall 10 of the cassette shell 4 (see FIG. 7), the locking claws 24 of the lock piece 15 are rotated in directions approaching each other, thereby Then, the locking claw 24 of the lock piece 15 is separated from the tape reels 6, 6, the reel locked state is released, and the tape reels 6, 6 become rotatable (see FIG. 9).
[0061]
FIG. 10 is an enlarged view showing a state where the cam follower 26 is in contact with the cam portion 31. The normal line T1 of the cam portion 31 and the moving direction of the cam follower 26 (the tangent line of the cam follower 26 at the rotation center O). Direction) If the pressure angle with T2 is “α”, it can be seen that the pressure angle α is small and the slider 14 slides smoothly.
[0062]
The direction of the rear piece 25 extending rearward of the lock piece 15 from the supported portion 22 can be designed relatively freely within the triangular space 11, so that the pressure angle can be further reduced. It is possible.
[0063]
In addition, the rear wall 10 serving as the cam portion 31 may be formed with an inclined surface that is deviated rearward as it goes outward, so that the pressure angle can be further reduced.
[0064]
By providing the cam portion 31 and the cam follower 26 on the rear wall 10 side of the triangular space 11, the degree of freedom in designing the pressure angle can be increased, and the smooth operation of the reel lock mechanism 9 can be ensured.
[0065]
When the tape cassette 1 is accidentally dropped, the locking piece 15 is impacted and attempts to rotate. However, the front piece extends so as to extend in substantially opposite directions about the supported portion 22 which is the center of rotation. Since the front piece 23 and the rear piece 25 are formed, the front piece 23 and the rear piece 25 generate rotational powers in opposite directions, respectively. As a result, both the powers are offset and the lock piece 15 as a whole becomes a lock piece 15. No rotating power is generated or extremely small, so that the reel locked state to the tape reels 6, 6 is not released.
[0066]
This means that the resilience of the lock spring 16 can be reduced. As described above, the contact pressure between the cam portion 31 and the cam follower 26 can be reduced, and wear of both contact surfaces can be reduced. It is possible to secure the smooth operation of the reel lock mechanism 9 for a long period of time, and it is not necessary to use a special material for the contact surface, and there is no increase in cost.
[0067]
It should be noted that the specific shapes and structures of the respective parts shown in the above-described embodiments are merely examples of the embodiment of the present invention, and the technical scope of the present invention is limited by these. It must not be interpreted in a tentative way.
[0068]
【The invention's effect】
As is apparent from the above description, the tape lock reel lock mechanism of the present invention uses the tape reel of the tape cassette in which the tape reel on which the tape-shaped recording medium is wound inside the cassette shell is rotatably supported. A reel lock mechanism for locking, which is disposed in a triangular space and is movably supported in the front-rear direction; two lock pieces rotatably supported on left and right sides of the slider; And a locking spring that urges the lock piece to rotate in a direction to engage the tape reel. The slider retreats when the tape cassette is mounted on the tape drive device, and In the reel lock mechanism in which the lock piece is rotated to release the reel lock, the lock piece is attached to the tape reel. A front piece having a locking claw to be fitted, and a rear piece extending substantially opposite to the front piece centering on a supported portion that is rotatably supported with respect to the slider, when the slider retreats The rear piece of the lock piece abuts against the inner surface of the back wall of the cassette shell, and the lock piece is rotated in the unlock direction.
[0069]
Further, the tape cassette of the present invention is a tape cassette having a reel lock mechanism for locking the tape reel of a tape cassette in which a tape reel having a tape-shaped recording medium wound inside a cassette shell is rotatably supported. The reel lock mechanism is disposed in a triangular space, and is provided with a slider movably supported in the front-rear direction, two lock pieces rotatably supported on both left and right sides of the slider, and the slider moved forward. It has a slide spring for pressing, and a lock spring for urging the lock piece to rotate in a direction to engage the tape reel, and the slider retreats when the tape cassette is mounted on the tape drive device, and The lock piece is rotated to release the reel lock, and the lock piece engages with the tape reel. A front piece having a front piece and a rear piece extending substantially opposite to the front piece about a supported portion that is rotatably supported with respect to the slider. When the slider retreats, The side piece abuts against the inner surface of the rear wall of the cassette shell, and the lock piece is configured to rotate in the unlocking direction.
[0070]
Therefore, in the reel lock mechanism and the tape cassette of the tape reel of the present invention, the orientation of the rear piece extending rearward of the lock piece from the supported portion can be relatively freely because the reel lock mechanism is provided in the triangular space. The pressure angle can be further reduced, and the operation of the reel lock mechanism can be made smoother.
[0071]
In addition, since the lock piece of the reel lock mechanism is constituted by the front piece and the rear piece extending substantially in the opposite directions about the supported portion, even if the tape cassette is dropped by mistake, the front piece and the rear piece can be used. In this case, the rotational force is generated in the opposite direction, and the rotational force is canceled out, so that the rotational force is not generated or extremely reduced as a whole of the lock piece. Can be set smaller, the contact pressure between the end of the rear piece of the lock piece and the back wall can be reduced, the wear of both contact surfaces is reduced, and the reel lock mechanism operates smoothly. Can be ensured for a long period of time, and the contact surface does not need to be made of a special material, which does not increase the cost.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a reel lock mechanism of a tape cassette of the present invention together with FIG. 2 to FIG. 10, which is a schematic perspective view of the tape cassette viewed from the front side.
FIG. 2 is a schematic perspective view of the tape cassette viewed from the back side.
FIG. 3 is an enlarged perspective view showing a reel lock mechanism.
FIG. 4 is an enlarged exploded perspective view of the reel lock mechanism.
FIG. 5 is a schematic plan view showing a state where an upper shell of the tape cassette is removed.
6A to 6C show the operation of the reel lock mechanism together with FIGS. 7 to 9, wherein FIG. 6A is an enlarged plan view, FIG. 6B is an enlarged sectional view, and FIG. .
FIG. 7 is a view showing a state in which a cam follower is in contact with a cam portion.
FIG. 8 is a diagram showing a state in which a lock piece is separated from a tape reel.
FIG. 9 is a diagram showing a state where the lock is completely released.
FIG. 10 is a schematic plan view for explaining a pressure angle.
11 is an enlarged perspective view for explaining a conventional reel lock mechanism together with FIGS. 12 to 18. FIG.
FIG. 12 is an enlarged exploded perspective view of the reel lock mechanism.
13A to 13C show the operation of the reel lock mechanism in order with FIGS. 14 to 16, wherein FIG. 13A is an enlarged plan view, FIG. 13B is an enlarged sectional view, and FIG. 13 is a view showing a locked state. .
FIG. 14 is a view showing a state in which a cam follower is in contact with a cam portion.
FIG. 15 is a diagram showing a state in which a lock piece is separated from a tape reel.
FIG. 16 is a diagram showing a state where the lock is completely released.
FIG. 17 is a view for explaining the pressure angle together with FIG. 18, and FIG. 17 is a schematic plan view of the conventional reel lock mechanism.
FIG. 18 is a schematic plan view in a case where a conventional reel lock mechanism is to be downsized.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Tape cassette, 4 ... Cassette shell, 5 ... Magnetic tape (tape recording medium), 6 ... Tape reel, 9 ... Reel lock mechanism, 10 ... Back wall, 11 ... Triangular space (space), 14 ... Slider, 15 … Lock piece, 16… lock spring, 17… slide spring, 23… front side piece, 24… locking claw, 25… rear side piece

Claims (2)

A reel lock mechanism for locking the tape reel of a tape cassette in which a tape reel on which a tape-shaped recording medium is wound inside a cassette shell is rotatably supported. A slider disposed in a space between the sliders (hereinafter referred to as a “triangular space”) and supported movably in the front-rear direction, two lock pieces rotatably supported on left and right sides of the slider, A sliding spring that presses the slider forward, and a locking spring that urges the locking piece to rotate in a direction to engage the tape reel, and the slider retreats when the tape cassette is mounted on the tape drive. And a reel lock mechanism in which the lock piece is rotated to release the reel lock,
The lock piece includes a front piece having a locking claw that engages with the tape reel, and a rear piece that extends substantially opposite to the front piece about a supported portion that is pivotally supported by the slider. Prepare
A reel lock mechanism for a tape cassette, wherein when the slider retreats, the rear piece of the lock piece contacts the inner surface of the rear wall of the cassette shell, and the lock piece rotates in the unlock direction. A tape cassette having a reel lock mechanism for locking the tape reel of a tape cassette in which a tape reel on which a tape-shaped recording medium is wound inside a cassette shell is rotatably supported,
The reel lock mechanism is provided in a space between the two tape reels and the inner surface of the rear wall of the cassette shell (hereinafter, referred to as a “triangular space”), and is supported movably in the front-rear direction. Two lock pieces rotatably supported on both left and right sides of the slider, a slide spring for pressing the slider forward, and a lock spring for biasing the lock piece to rotate in a direction to engage the tape reel. The slider is retracted by mounting the tape cassette to the tape drive device, and the lock piece is rotated to release the reel lock,
The lock piece includes a front piece having a locking claw that engages with the tape reel, and a rear piece that extends substantially opposite to the front piece about a supported portion that is pivotally supported by the slider. Prepare
A tape cassette, wherein when the slider retreats, the rear piece of the lock piece contacts the inner surface of the back wall of the cassette shell, and the lock piece rotates in the unlock direction.

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