JPH04149879A - Magnetic tape cassette - Google Patents

Abstract

PURPOSE:To prevent the generation of abrasion between a tape reel and a cassette housing by allowing lock claw parts of a brake member to engage/ disengage with/from a tape reel locking part while interlocking with the entering position and retiring position of a lock slider. CONSTITUTION:When a tape cassette is not used, the lock slider 9 is slided in the A direction by the energizing force of a spring 10 and a pressing part 11 presses the pressure-expanding part 8 of the brake member 4 to expand the part 8 in the C direction. At that time, the lock claw parts 7a, 7b of the member 4 are engaged with a lock part 6 to surely lock the tape reel. At the time of using the tape, the slider 9 is slided in the B direction while interlocking with an unlocking member 12. At that time, the pressing part 11 is separated from the part 8, brake releasing levers 13a, 13b press the part 11 to move the part 8 in the D direction. Simultaneously with the above movement, the claw parts 7a, 7b are separated from the lock part 6 and the tape reel is unlocked.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a pair of tape reels on which a magnetic recording tape is wound, and a device that locks the pair of tape reels when the tape is not in use, and locks the pair of tape reels when the tape is not in use. The present invention relates to a magnetic tape cassette consisting of a cassette housing that accommodates a brake member that unlocks the pair of tape reels in conjunction with a member on the tape deck side, and more specifically, relates to a magnetic tape cassette that mainly accommodates magnetic recording tape for a VTR. It is something.

(Prior art) VTR (Video Tape Recorder)
) A magnetic tape cassette that houses magnetic recording tape has a pair of tape reels wound with this magnetic recording tape that are locked when the tape is not in use, and when the tape is in use, the pair of tape reels are locked in conjunction with a member on the tape deck side when the tape is in use. Equipped with a brake member to unlock the tape reel.

In a conventional magnetic tape cassette, an uneven portion is formed on the outer periphery of the flanges of a pair of tape reels, and a brake member equipped with a pawl that engages with and disengages from the uneven portion is moved radially toward the center of the tape reel by a spring or the like. Generally, the tape reel is biased in the direction, and this biasing force causes the concavo-convex portion and the claw portion to engage with each other, thereby locking the tape reel.

(Problem to be Solved by the Invention) However, the braking force of the conventional magnetic tape cassette brake member is weak, and the tape reel moves easily within the cassette housing, causing the tape reel and cassette housing to wear out or locking to occur. Problems such as easy removal were observed. In order to increase the braking force of the conventional brake member as described above, if the urging force of a spring or the like is strengthened, there are problems such as the unlocking force of the lock releasing member on the tape deck side being exceeded. However, it was difficult to solve the above problems.

In view of the above, the present invention provides a magnetic tape cassette equipped with a brake member capable of locking the tape reel with high braking force and suppressing movement of the tape reel within the cassette housing. The purpose is to

(Means for Solving the Problems) In order to solve the above problems, a magnetic tape cassette according to the present invention includes a pair of tape reels around which magnetic recording tape is wound, and a cassette housing that accommodates the pair of tape reels. In this magnetic tape cassette, the bottom surface of the cassette housing is provided with a lock release hole into which a lock release member on the tape deck side enters when the magnetic tape cassette is loaded into the tape deck. The cassette housing includes, in the vicinity of the pair of tape reels, a locking pawl that engages with and disengages from the locking portions of the tape reels. A brake member is pivotally supported, and includes a substantially wedge-shaped expanded portion that presses the expanded portion of the brake member. A lock slider having a pressing part is provided so as to be movable between a position where it enters the expanding part and a position where it retreats from the expanding part, and the lock slider is biased toward the entering position, and By upward movement of the lock release member that has entered through the lock release hole, it is possible to move to the retreat position, and in conjunction with the movement of the lock slider between the approach position and the retreat position, the lock pawl of the brake member The tape reel is characterized in that the portion is configured to engage with and disengage from the locking portion of the tape reel.

Here, "the pair of tape reels include a locking part consisting of a large number of recesses provided along the outer periphery of the flange" means, for example, that the pair of tape reels have a locking part consisting of a large number of recesses provided along the outer periphery of the flange. , those that are formed with uneven parts on the outer periphery of the flange, and those that have many recesses formed on the surface near the outer periphery of the flange of the tape reel along the outer periphery of the tape reel, etc. This refers to a tape reel having a large number of recesses on the outer periphery of its flange that connect and separate.

(Operations and Effects) As described above, in the magnetic tape cassette according to the present invention, the pair of tape reels on which the magnetic recording tape is wound have a locking portion consisting of a large number of recesses provided along the outer periphery of the flange. The cassette housing that accommodates the pair of tape reels includes a lock claw portion that engages and disengages from the locking portion of the tape reel, and a substantially V-shaped lock claw portion near the pair of tape reels. A brake member having a formed expanded portion is pivotally supported, and a lock slider having a substantially wedge-shaped pressing portion that presses the expanded portion of the brake member is provided near the brake member. , the lock slider is provided so as to be movable between a position in which it enters the expansion part and a position in which it retreats from the expansion part, and the lock slider is biased toward the entrance position, and is provided with a lock release hole in the bottom surface of the cassette housing. By moving the lock release member upward on the side of the tape deck that has entered further, it is possible to move to the retreat position, and in conjunction with the movement of the lock slider between the approach position and the retreat position, the lock claw portion of the brake member is moved upward. Since the lock slider is configured to engage and disengage from the locking portion of the tape reel, the approximately wedge-shaped pressing portion of the lock slider that is biased by a spring or the like is formed approximately in a V-shape. pressing the expanded portion of the brake member and applying a force to spread the expanded portion on the lock claw portion of the brake member;
Tape reel can be locked. Therefore, the brake member of the magnetic tape cassette of the present invention exerts a large braking force due to the wedge effect even if the biasing force on the lock slider is comparable to the biasing force on a conventional brake member. It becomes possible to do so.

Therefore, the magnetic tape cassette of the present invention solves the above-mentioned problem caused by the weak braking force of the brake member, which was observed in conventional magnetic tape cassettes. This solves problems such as the housing being worn out and the lock easily coming off.

As explained above, the magnetic tape cassette according to the present invention utilizes the wedge effect to lock the tape reel with high braking force, making it difficult for the lock to come off, and suppressing the movement of the tape reel within the cassette housing. This has remarkable effects such as preventing wear between the cassette housing and the cassette housing.

(Example) Details of the magnetic tape cassette according to the present invention will be described below based on an example.

FIG. 1 is a plan view showing the internal structure of a magnetic tape cassette according to the present invention, FIG. 2A is a plan view showing the structure when the brake member is locked, and FIG. 2B is a plan view showing the structure when the brake member is unlocked. Figure 3A is a Ha-ma sectional view in Figure 2A, Figure 3B is a mb-mb sectional view in Figure 2B, and Figure 4
Figure A is a perspective view showing the configuration of the brake member when it is locked;
and FIG. 4B is a perspective view showing the configuration when the lock is released.

As shown in FIG. 1, the magnetic tape cassette according to the present invention includes a pair of tape reels 2a around which a magnetic recording tape 3 is wound.
, 2b, the brake member 4, and the cassette housing 1.
It will be accommodated in The pair of tape reels 2a and 2b are
In this embodiment, the outer peripheries of the flanges 5a and 5b are provided with locking portions 6 having a concave and convex shape. This is conventionally found within the shell.

As shown in FIGS. 4A and 4B, the brake member 4 has locking claw portions 7a and 7b that engage and disengage from the locking portion 6, and a push-up portion 8 formed in a substantially V shape. and is pivotally supported by the cassette housing 1.

In the vicinity of the brake member 4, a lock slider 9 is slidably supported by the cassette housing 1 by means not shown. This lock slider 9 is biased by a spring 10 in the direction of arrow A in FIGS. 4A and 4B. Further, the lock slider 9 includes a pressing portion 11 formed in a substantially wedge shape that presses and expands the expansion portion 8 of the brake member 4.

When the magnetic tape cassette is not in use, the lock slider 9 slides in the direction of arrow A in FIG. 4A by the biasing force of the spring IO as shown in FIG. , and expand the expanded portion 8 in the direction C in the figure. At this time, the lock claw portion 7a of the brake member 4
, 7b engages with the locking portion 6, and the tape reel 2a
, 2b securely locked. Further, when the magnetic tape cassette is used, the lock slider 9 slides in the direction of arrow B in conjunction with the lock release member 12 on the tape deck side, as shown in FIG. 4B. At this time, the pressing part 11 of the lock slider 9 separates from the expanding part 8 of the brake member 4, and the brake release bar 1 provided on the lock slider 9 moves away from the expanding part 8 of the brake member 4.
3a and 13b press the expanded portion 8 of the brake member 4 to move the expanded portion 8 in the direction of the arrow in FIG. 4B. At the same time, the lock claws 7a, 7b of the brake member 4 are released from the locking part 6, and the tape reels 2a, 2b are removed.
will be unlocked.

The details of the operation of the lock slider 9 will be explained based on FIGS. 2A to 3B.

As shown in FIG. 2A, the lock slider 9 when locked is urged in the direction of arrow A in the figure by the spring 10, and the pressing part 10 of the lock slider 9 presses the expanding part 8 of the brake member 4, Stops at the pressed position.

As shown in FIG. 3A, the lock slider 9 is provided with an insertion hole 14 into which a lock release member 12 on the tape deck side is inserted. This insertion hole 14 is provided with an inclined portion 1B inside as shown in FIG. 3A. Further, the position of the lock slider 9 when locked is set so that the relationship with the position of the lock release hole 15 on the bottom surface of the cassette housing is as shown in FIG. 3A.

When the magnetic tape cassette is loaded into the tape deck,
The lock release member 12 on the tape deck side enters through the lock release hole 15. At this time, the tip of the lock release member 12 presses against the inclined portion 16 provided in the insertion hole 14 of the lock slider 9. In conjunction with the upward movement of the lock release member 12, the lock slider 9, whose inclined portion 16 is pressed against the tip of the lock release member 12, is slid in the direction of arrow B as shown in FIG. 3B. . At the same time, the brake release bars 13a and 13b of the lock slider 9 press the expanded portion 8 of the brake member 4, causing the expanded portion 8 to move to the second position.
Move the tape reels 2a, ' in the direction of the arrow in figure B.
Unlock 2b.

The feature of the present invention is that the biasing force of the spring IO applied to the lock slider 9 is applied to the brake member 4 by a wedge effect,
This allows a large braking force to be obtained.

Although the details of the magnetic tape cassette according to the present invention have been described above based on one embodiment, the magnetic tape cassette according to the present invention is not limited to the aspects of this embodiment.

For example, in the embodiment described above, the brake member 4 is made up of two members, but it is also possible to make this into one member by using an elastic material. In this case, the brake member 4
Further effects can be achieved, such as simplifying the configuration and reducing costs. Further, in the above embodiment, a locking portion 6 having an uneven shape, which is conventionally found in a shell, is provided on the outer periphery of the flange of the tape reel. It is also possible to form a plurality of recesses arranged in a row along the outer periphery of the tape reel. Hereinafter, an embodiment in which the locking portion has such a configuration will be described in detail.

FIG. 5A is a perspective view showing the structure of the brake member in a locked state in an embodiment different from the above-described embodiment, and FIG. 5B is a perspective view showing the structure when the brake member is unlocked.

As shown in FIG. 5A, the tape reel has its flange 5
A locking portion 6' is provided on the surface near the outer periphery of the tape reel a' and 5b', which is formed by a large number of recesses arranged in a row along the outer periphery of the tape reel.

The brake member 4' has lock claw parts 7a' and 7b' that engage with and disengage from the locking part 6', and a generally V-shaped expanded part 8', and the brake member 4' As shown in the figure.

As shown in the figure, a lock slider 9' is pivotally supported by the cassette housing 1' near the brake member 4'. This lock slider 9' is moved by a spring 10' as shown in FIG. 5A.
It is biased downward in FIG. 5B. Further, the lock slider 9' includes a pressing portion 11' formed in a substantially wedge shape that presses and expands the expanding portion 8' of the brake member 4'.

When the magnetic tape cassette is not in use, the lock slider 9' is urged downward in FIG. 58 by a spring 10' as shown in FIG. ' is pressed, and the expanded portion 8' is expanded in the force direction C' in the figure. At this time, the lock claws 7a' and 7b' of the brake member 4' engage with the engaging portion 6' to securely lock the tape reel. Also, lock slider 9'
When the magnetic tape cassette is used, the cassette moves upward in conjunction with the unlocking member 12' of the tape deck, as shown in FIG. 5B. At this time, the pressing part 1 of the lock slider 9'
1' separates from the expanded portion 8' of the brake member 4', and the brake release bars 13a' and 13b' provided on the lock slider 9' release the brake member 4'.
Press the expanded portion 8' to move the expanded portion 8' in the direction of arrow D' in FIG. 5B. At the same time, the lock claws 7a' and 7b' of the brake member 4' are released from the locking part 6', and the tape reel is unlocked.

Even in this case, the urging force of the spring 10' on the lock slider 9' is applied to the brake member 4' by a wedge effect, thereby making it possible to obtain a large braking force. Further, in this case, further effects such as being able to almost completely prevent the tape reel from moving within the cassette housing are achieved.

As explained above, the embodiment of the magnetic tape cassette according to the present invention can be modified in various ways without impairing the above-mentioned effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the internal structure of an embodiment of the magnetic tape cassette according to the present invention, FIG. 2A is a plan view showing the structure when the brake member is locked, and FIG. 2B is the plan view when the brake member is unlocked. FIG. 3A is a plan view showing the configuration of the second
■a-ma sectional view of Figure A, Figure 3B is mb of Figure 2B
-mb sectional view, FIG. 4A is a perspective view showing the structure of the brake member when it is locked, FIG. 4B is a perspective view showing the structure when the brake member is released, and FIG. 5A is a perspective view of the magnetic tape cassette according to the present invention. FIG. 5B is a perspective view showing the structure of the brake member according to another embodiment when the brake member is locked, and FIG. 5B is a perspective view showing the structure when the brake member is unlocked. 1... Cassette housing 2a, 2b... Tape reel 3... Magnetic recording tape 4.4'... Brake member 5a, 5b, 5a', 5b' -... Tape reel flange 6.6' ...Locking parts 7a, 7b, 7a', 7b' -0 claw part 8
．． 8'...Press expansion part 9.9'...Lock slider io, io'...Spring 11.11'...
- Pressing parts 12, 12'...Lock release members 13a, 13b, 13a', 13b'
-...Brake release bar 14...Insertion hole 15, 15'...Lock release hole 16...Slope part A
, B... Lock slider movement direction C, D... Expansion part movement direction Fig. 2A Fig. 3A Fig. 2B Fig. 3B b October 2003 Patent application filed in 2000 No. 274.263 Title of the invention Relationship with the case of a person who corrects magnetic tape cassettes Patent application Colonel Address 210 Nakanuma, Minamiashigara City, Kanagawa Prefecture Name (
520) Fuji Photo Film Co., Ltd. 4, Agent address: 7th floor, Hauraiya Building, 5-2-1 Roppongi, Minato-ku, Tokyo Voluntary amendment 6, "Detailed description of the invention" section of the specification subject to amendment and drawings 7. Contents of the amendment (1) Page 13 of the specification, line 10, next to “It is possible to do this.” “In this embodiment, in order to enhance the wedge effect of the lock slider 9, the brake member 4 and the lock slider 9, and this point will be explained below. Fig. 5 is a partially enlarged plan view showing the action of the brake member on the lock slider during locking. As shown in FIG.
An angle α between an extension line P extending along the contact surface 4a of the brake member 40 that contacts the inclined surface 9a of the brake member 4 and a straight line Q extending parallel to the moving direction of the lock slider 9 is
The angle β between the straight line R and the straight line O that passes through the rotation center O and intersects with any point X on the inclined surface 9a of the lock slider 9.
It is designed to be smaller than. By doing this, a force is applied from the tape reel (as shown) to the brake member 4 in the direction of unlocking the brake member 4, and this force causes the brake member 4 to release the lock on the inclined surface 9a of the lock slider 9. Even when a force F in a direction perpendicular to the inclined surface 9a acts at the point If it is broken down into a component F2 in a direction perpendicular to the radius OX, the direction of the component F1 is always the direction facing the rotation center of the brake member 4, 0, that is, the direction that presses the lock slider downward in the figure (
This also applies to the other arm of the circuited brake member 4. ), it becomes difficult for the lock slider 9 to come off from the brake member 4, that is, the wedge effect of the lock slider 9 is improved. ” is inserted. (2) "Figure 5A" on page 14, line 8, page 14, line 12, page 15, line 3, line 10, and page 17, line 6, is corrected to "Figure 6A." (3) ``Figure 5B'' on page 14, line 1O, page 15, line 3, page 15, line 16, line 3, and page 17, line 8, ``Figure 5B'' is corrected to ``Figure 6B''. (4) On page 15, line 9, "Figure 4A" is corrected to "Figure 6A." (5) Page 17, line 6 - 15th chapter, 16th chapter, ``Perspective view showing,'' followed by ``Figure 5 is a partially enlarged plan view showing the action of the brake member on the lock slider during locking.'' ” is inserted. (6) Figures 5A and 5B of the drawings are deleted and the attached Figures 5, 6A, and 6B are added.

Claims (1)

[Scope of Claims] Consisting of a pair of tape reels wound with magnetic recording tape and a cassette housing housing the pair of tape reels, the magnetic tape cassette is loaded into a tape deck at the bottom of the cassette housing. In this case, in a magnetic tape cassette provided with a lock release hole into which a lock release member on the tape deck side enters, the pair of tape reels have a locking portion consisting of a large number of recesses provided along the outer periphery of the flange. The cassette housing includes, near the pair of tape reels, a lock claw portion that engages with and disengages from the locking portion of the tape reel, and a generally V-shaped expansion portion. A lock slider having a substantially wedge-shaped pressing portion that presses the expanded portion of the brake member near the brake member enters the expanded portion. The lock slider is provided so as to be movable between a position and a retreating position from the pushing and expanding part, and the lock slider is biased toward the entering position and moves upwardly of the lock releasing member that has entered from the lock releasing hole. The lock claw part of the brake member engages and disengages from the locking part of the tape reel in conjunction with the movement of the lock slider between the approach position and the retreat position. A magnetic tape cassette characterized by being configured as follows.