JP3953634B2 - Magnetic tape cartridge - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic tape cartridge, and in particular, in a magnetic tape cartridge in which a single reel wound with a magnetic tape is rotatably accommodated in a cartridge case, the reel is in a rotation-restrained state when not in use. The present invention relates to the structure of the rotation stopping means.
[0002]
[Prior art]
Conventionally, a magnetic tape cartridge used as a recording medium used in an external storage device such as a computer is of a type in which a magnetic tape is wound around a single reel and the reel is rotatably accommodated in a cartridge case. Things are known. This magnetic tape is used for data storage in computers, etc., and stores important information, so that troubles such as tape jamming do not occur and the magnetic tape is pulled carelessly when not in use, such as during storage. Reel rotation stopping means for restricting the rotation of the reel is provided so as not to be released.
[0003]
The reel rotation restraining means includes a restraining member that engages with a part of the reel and restrains its rotation, and when the cartridge is loaded in a drive such as an external storage device, the restraining member is driven to the drive side rotation driving means. The stop state is provided in accordance with the reel chucking operation.
[0004]
[Problems to be solved by the invention]
Therefore, in order to improve the reliability of the operation of the reel rotation restraining means described above and to prevent dust from entering the cartridge case, the release member is not provided in the middle, but a structure in which the restraining member is directly moved by the drive side rotational driving means. It is conceivable to provide a structure in which the restrained state is released through the insertion of the.
[0005]
In other words, in a non-use state, the restraining member restrains the reel from inadvertently rotating so that the magnetic tape is not pulled out. When chucking is performed, the release member moves in conjunction with the operation, and the stop member is released. In this state, the reel can rotate, and the magnetic tape can be pulled out and taken up.
[0006]
And in the structure which interposes the above releasing members, when a number of parts increases, an assembly becomes complicated and a process increases and there exists a problem that workability | operativity falls. In particular, the installation space of the reel rotation restraining means in the cartridge case is narrow, and it is necessary to dispose a biasing member that holds the restrained state, so that the assembly is complicated.
[0007]
The present invention has been made in view of the above points, and it is an object of the present invention to provide a magnetic tape cartridge in which assemblability is improved by reducing the number of parts of the reel rotation stopping means.
[0008]
[Means for Solving the Problems]
The magnetic tape cartridge of the present invention that has solved the above-described problem is a single reel on which a magnetic tape is wound is rotatably accommodated in a cartridge case, the reel is allowed to rotate when in use, and the reel is not used when not in use. The reel rotation restraining means includes a reel rotation restraining means for restraining rotation, and the reel rotation restraining means moves so as to be able to come into contact with and separate from the reel and is latched with a latching projection of the reel to restrain the rotation. And a restraining member formed integrally with a biasing portion that biases the latching portion in the latching direction, and rotates integrally with the reel and moves according to the chucking operation of the drive-side rotation driving means. A release member that moves the latching portion of the restraining member in the unlocking direction, and the restraining member has an arm portion extending radially around the outer periphery of the central disk portion, and the latching portion is formed on the arm portion. The arm The urging portion by a spring extending in the radial direction from the disk portion is integrally provided between the arm portion and the first groove portion of the holding portion erected on the cartridge case, and the second groove portion The urging portion is engaged with the urging portion, the urging portion is elastically deformable, and the urging portion is elastically deformable so that the locking member can be engaged with and disengaged from the engagement protrusion in a state where rotation of the restricting member is restricted. It is what.
[0009]
Specifically, in the restraining member , the locking portion and the urging portion are formed as one part by processing one plate material .
[0010]
【The invention's effect】
According to the present invention as described above, the restraining member in the reel rotation restraining means is formed by integrally forming the locking portion and the urging portion, thereby reducing the number of parts and assembling the magnetic tape cartridge as a whole. Can be performed easily.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a cross-sectional view of the magnetic tape cartridge in this embodiment when not in use, FIG. 2 is an exploded perspective view of the main part, and FIG. 3 is a cross-sectional view of the main part in the used state.
[0012]
The magnetic tape cartridge 1 is a cartridge case in which a magnetic tape (not shown) is wound around a single reel 2, and an upper case 31 and a lower case 32 provided with an opening 32a at the center are fastened by screws or the like. 3, the reel 2 is accommodated in a rotatable manner. The magnetic tape cartridge 1 further includes reel rotation restraining means 10 that allows the reel 2 to rotate when in use and restrains the rotation of the reel 2 when not in use.
[0013]
The reel 2 has a bottomed cylindrical reel hub 21 on which a magnetic tape is wound on the outer periphery, and a lower flange portion 22 and an upper flange portion 23 that project from the outer periphery of the upper and lower ends of the reel hub 21 in a disk shape in the radial direction. The reel hub 21 and the lower flange portion 22 are integrally formed of synthetic resin, and are joined to the upper flange portion 23 by, for example, ultrasonic welding. The lower part of the reel hub 21 is closed at the center by a bottom wall 21a, and a reel gear 24 for rotationally driving the reel 2 is formed in an annular shape on the outer periphery of the lower surface of the bottom wall 21a. A reel plate 25 made of an annular metal plate for suction is attached. The reel gear 24 and the reel plate 25 of the reel 2 are arranged so as to face the opening 32 a on the bottom surface of the cartridge case 3.
[0014]
Further, the drive side rotation drive means 11 includes an annular drive gear 13 and a magnet (not shown) on the upper end surface of the rotation shaft 12, and its chucking operation is performed with respect to the loaded magnetic tape cartridge 1. 12, the drive gear 13 meshes with the reel gear 24, and the reel plate 25 is attracted by a magnet to maintain the meshed state.
[0015]
Next, the mechanism of the reel rotation stopping means 10 will be described. The reel rotation restraining means 10 includes a restraining member 4 that is integrally provided with a locking portion 43 and a biasing portion 5 that move in the vertical direction so as to be able to contact and separate from the reel 2, and a direction in which the restraining member 4 is released. And a release member 6 to be moved.
[0016]
In the bottom wall 21a of the reel 2, three insertion holes 26 penetrating the reel gear 24 in the vertical direction are arranged at equal intervals on the circumference, and further, the insertion is made on the upper surface of the bottom wall 21a. Three locking projections 27 are erected at equal intervals on the circumference at different phase positions from the hole 26, and the leading ends of the locking projections 27 are formed in a chevron taper surface. Three or more insertion holes 26 and locking protrusions 27 may be arranged. The reel 2 shown in FIG. 2 is shown in a state where only the bottom wall 21a is cut away.
[0017]
The restraining member 4 is entirely formed of a plate material, and arm portions 42 extend radially at three locations on the outer periphery of the central curved disk portion 41, and locking portions 43 are bent and formed on both sides of the lower surface of the distal end of the arm portion 42. ing. The front end of the locking projection 27 can be inserted and locked between the locking portions 43 on both sides.
[0018]
Further, on the outer periphery of the disk portion 41 of the restraining member 4, an urging portion 5 by a leaf spring extending in the radial direction is integrally provided between the arm portions 42.
[0019]
An annular holding portion 33 is erected on the inner surface of the upper case 31 of the cartridge case 3, and the tip of the arm portion 42 of the restraining member 4 extends vertically in the deep first groove portion 33 a provided at the lower end thereof. The distal end of the urging portion 5 is engaged with the shallow second groove portion 33b.
[0020]
As a result, the restraining member 4 is restricted to be non-rotatable, and the locking portion 43 is installed so as to be able to move toward and away from the bottom wall 21a of the reel 2 so as to move away from the bottom wall 21a. The biasing portion 5 by the spring is elastically deformed and biases the disk portion 41 and the locking portion 43 downward.
[0021]
The release member 6 is interposed between the restraining member 4 and the bottom wall 21a of the reel hub 21 so as to be vertically movable, and arm portions 62 extend in the radial direction at three locations on the outer periphery of the central disk portion 61. A rectangular bar-shaped push-up portion 63 is formed on the lower surface of the distal end of the arm portion 62 so as to extend in the vertical direction. Each push-up portion 63 is inserted into an insertion hole 26 opened in the reel hub 21 so as to be able to move in and out, and a tip thereof is positioned facing a tooth portion of the reel gear 24 on the lower surface of the reel hub 21. At that time, the locking protrusion 27 is positioned between the arm portions 62. The push-up portion 63 may have a round bar shape.
[0022]
Further, a protrusion 64 is formed extending upward at the center of the upper surface of the disc portion 61 of the release member 6, and its tip is provided on a spherical surface, and the concave shape of the disc portion 41 curved to the convex shape of the restraining member 4. It is in contact with the center of the bottom surface.
[0023]
When the release member 6 is in the lowest lowered position (FIG. 1), the lower end surface of the push-up portion 63 is substantially the tooth tip position of the reel gear 24, and the drive gear 13 is driven by the chucking operation of the drive side rotational drive means 11 on the reel gear 24. There has so releasing member 6 in response to the meshing is pushed up by a predetermined stroke (Figure 3). Further, the release member 6 rotates integrally with the reel 2 by fitting the push-up portion 63 into the insertion hole 26.
[0024]
Further, in the above braking members 4, the circular plate portion 41 by the biasing force of the biasing unit 5, which lower surface thereof presses the protrusion 64 of the releasing member 6 downward, both projections 64 makes sliding contact via the tip. As a result, mutual positioning, prevention of displacement, and the like are achieved.
[0025]
When assembling the magnetic tape cartridge 1, the upper case 31 is placed upward, and the first and second groove portions 33 a and 33 b of the holding portion 33, the locking portion 43, and the urging portion 5 are combined to form the stop member 4. When the reel 2 in the state where the push-up portion 63 of the release member 6 is inserted into the insertion hole 26 is assembled upside down after the placement, and then the lower case 32 is joined, the screw from the lower surface is adopted. Fastening can be easily performed.
[0026]
The operation of the reel rotation restraining means 10 will be described. FIG. 1 shows a state in which the magnetic tape cartridge 1 is not used, such as a storage state. In this state, the disc portion is urged by the urging force of the urging portion 5 of the restraining member 4. 41, arm portion 42, locking portion 43 , release member 6 and reel 2 have moved to the lower case 32 side of the cartridge case 3, and the opening 32 a at the center of the lower case 32 is closed by the reel 2. The release member 6 is in the lowest lowered state where the lower surface is in contact with the bottom wall 21 a of the reel hub 21, and the push-up portion 63 protrudes so that the tip end portion coincides with the tooth tip position of the reel gear 24. The disc portion 41 of the restraining member 4 that is in contact with 64 is also in the lowered position, and the leading end portion of the latching protrusion 27 of the reel 2 engages with the latching portion 43 to restrain the rotation of the reel 2 when not in use. The magnetic tape is prevented from being pulled out.
[0027]
In the state where the reel 2 is rotated in the rewinding direction and the magnetic tape is rewound to the final end, a leader pin (not shown) fixed to the tip of the magnetic tape is locked to a part of the cartridge case 3 and is reel 2. In this state, the rotation position of the locking projection 27 and the position of the locking portion 43 of the locking member 4 are set to coincide with each other.
[0028]
On the other hand, when the cartridge of FIG. 3 in which the magnetic tape cartridge 1 is loaded in the drive is used, the rotation shaft 12 of the drive side rotation drive means 11 approaches the bottom surface of the reel 2, and the drive gear 13 is moved to the reel gear 24 by the chucking operation. When the reel 2 is moved slightly upward and held, the tooth tip of the drive gear 13 comes into contact with the tip of the push-up portion 63 of the release member 6 and pushes it up. Accordingly, the protrusion 64 of the release member 6 pushes up the disk portion 41 of the restraining member 4 while elastically deforming the disc portion 41 against the urging force of the urging portion 5 by the leaf spring, and the locking portion 43 is moved along the groove portion 33a. To move upward in the release direction. As a result, the engagement between the locking portion 43 and the locking projection 27 is released, and the reel 2 is rotatable.
[0029]
Then, when the magnetic tape is pulled out by the drive of the recording / reproducing apparatus or the reel 2 is rotated by winding, the release member 6 rotates integrally with the reel 2, while the restraining member 4 is fixed integrally with the cartridge case 3 side. The release member 6 rotates in a low friction and low wear state with respect to the restraining member 4 by the tip contact portion of the protrusion 64. As a result, the rotational resistance of the reel 2 is reduced, and the generation of wear powder can be reduced because there are few sliding portions.
[0030]
The release member 6 in the embodiment is made of a low friction and low wear material. For example, it is molded from POM (polyoxymethylene), PC (polycarbonate) resin, PC resin added with graphite, ABS resin, ABS resin added with graphite, nylon resin added with molybdenum disulfide, or the like.
[Brief description of the drawings]
1 is a cross-sectional front view of a magnetic tape cartridge according to an embodiment of the present invention in a non-use state. FIG. 2 is an exploded perspective view of the main part of the magnetic tape cartridge of FIG. Sectional view of the main part of the cartridge in use [Explanation of symbols]
1 Magnetic Tape Cartridge 2 Reel 3 Cartridge Case 4 Stopping Member 5 Biasing Member 6 Release Member
10 Reel rotation stop means
11 Drive side rotation drive means
12 Rotating shaft
13 Drive gear
21 reel hub
21a Bottom wall
24 reel gear
26 Insertion hole
27 Locking protrusion
33 Holding part
33a, 33b Groove
41 Disc
42 Arm
43 Locking part
61 Disc
62 Arm
63 Pusher
64 Protrusion

Claims (2)

A magnetic tape provided with a reel rotation restraining means for accommodating a single reel wound with a magnetic tape in a cartridge case so as to be rotatable, allowing rotation of the reel when in use, and restraining rotation of the reel when not in use In the cartridge,
The reel rotation restraining means moves so as to be able to come into contact with and separate from the reel, engages with a locking projection of the reel and restrains the rotation thereof, and biases the locking portion in the locking direction. A stop member in which an urging portion is integrally formed, and a release that rotates integrally with the reel and moves in accordance with a chucking operation of the drive side rotation driving means, and moves the locking portion of the stop member in the release direction. With members ,
The restraining member has an arm portion extending in a radial direction on an outer periphery of a central disc portion, the locking portion is formed on the arm portion, and the attachment by a spring extending in the radial direction from the disc portion between the arm portions. A biasing portion provided integrally, the arm portion is inserted into a first groove portion of a holding portion erected on the cartridge case, and the biasing portion is locked in a second groove portion; The magnetic tape cartridge is characterized in that, in a state where rotation is restricted, the engaging portion can be engaged with and disengaged from the engaging protrusion, and the urging portion is elastically deformed . 2. The magnetic tape cartridge according to claim 1 , wherein the locking member is formed by processing a single plate material so that the locking portion and the urging portion are formed as one part . 3.

Images