JP3859671B2 - Single reel type magnetic tape cartridge - Google Patents

Description

  The present invention relates to a single reel type magnetic tape cartridge typified by a magnetic recording medium of a computer data recorder, which has an improved reel lock mechanism.

  Some magnetic tape cartridges of this type (Patent Document 1) are provided with a reel lock mechanism of the form shown in FIG. There, a tape reel 53 is constituted by an upper flange 50, a lower flange 51, and a cylindrical hub 52 formed integrally with the lower flange 51, and a lock member 54 disposed inside the hub 52 is not used. The idle rotation of the tape reel 53 is prevented. An iron plate 55 that is magnetically attracted by the drive shaft on the tape drive side is fixed to the center of the lower surface of the inner bottom wall of the hub 52, and drive teeth 56 that mesh with the drive teeth of the drive shaft of the tape drive are provided on the peripheral wall. Is provided.

The lock member 54 has a circular seat plate 58 that receives the lower end of the compression coil spring 57, and has a slide boss 59 and a passive pin 60 above and below the central portion of the seat plate 58. The slide boss 59 is engaged and guided by a guide projection 63 provided on the upper wall 61 of the main body case 1 so that it can slide up and down but cannot rotate. The lower surface of the seat plate 58 and the upper surface of the receiving seat 62 protruding from the inner bottom of the hub 52 have lock teeth 64 and 65 that mesh with each other. Accordingly, the tape reel 53 cannot rotate in a state where the lock teeth 64 and 65 are engaged with each other. In use, the passive pin 60 exposed on the lower surface of the central portion of the tape reel 53 is pushed up by the drive shaft of the tape drive to release the engagement between the lock teeth 64 and 65. At the same time, the tape reel 53 is attracted by the magnet on the drive shaft via the iron plate 55, and the rotational force is transmitted to the tape reel 53 via the drive teeth 56.
JP-A-8-63939 (FIG. 2)

  In the above tape cartridge, the passive pin 60 of the lock member 54 is directly pushed up by the drive shaft to release the meshed state of the lock teeth 64 and 65, so the locked state may not be reliably released. In a state in which the lock member 54 is separated and operated above the seat 62, the entire lock member 54 is tilted so that the lock teeth 64 on the seat plate 58 side and the lock teeth 65 on the seat 62 side are in contact with each other on the tilted lower end side. This is because the drive shaft is idled and the tape reel 53 cannot be reliably rotated in such a case.

  Since the guide protrusion 63 is engaged with the slide boss 59, it serves to prevent the lock member 54 from tilting. However, in order to smoothly slide the lock member 54 up and down, it is necessary to secure a certain amount of clearance between the sliding surfaces of the slide boss 59 and the guide projection 63, and the lock member 54 is tilted by this clearance. Inevitable. This is also a factor that the lock member 54 tilts. As described above, if the unlocking of the tape reel 53 remains insufficient, abnormal tension acts on the magnetic tape, causing a serious accident such as tape cutting. In addition, the lock teeth 64 and 65 may be lost or worn abnormally, and the reel lock may not be reliably performed.

  The object of the present invention is to always ensure that the reel lock mechanism can be switched to the unlocked state, and to prevent the magnetic tape from being pulled out of the case while the reel is locked. It is intended to improve reliability by eliminating occurrence of serious accidents such as breakage of lock teeth. Another object of the present invention is to provide a single reel type magnetic tape cartridge capable of improving the durability of the unlocking member.

In the magnetic tape cartridge of the present invention, as shown in FIGS. 1 and 2, one tape reel 2 is housed in a main body case 1 so as to be rotatable on a drive shaft insertion port 18 of the case bottom wall 17. A reel lock mechanism is provided between the inner upper surface of the hub bottom wall 11 of the hub 10 provided at the center of the tape reel 2 and the upper wall 12 of the main body case 1 to prevent the idle rotation of the tape reel 2 when not in use. is there. As shown in FIG. 1, the reel lock mechanism includes a lock member 19 that moves up and down, a spring 20 that presses and urges the lock member 19 into engagement with the hub bottom wall 11, and the lock member 19 and the hub bottom wall 11. An unlocking member 21 disposed between the upper surface and the inner upper surface is provided. The unlocking member 21 has a plurality of leg pieces 35 having the same length protruding downward.

Specifically, the plurality of leg pieces 35 are disposed at equal distances from the center of the lower surface of the unlocking member 21 and at equal intervals. The lower ends of the leg pieces 35 project downward from the outer lower surface of the hub bottom wall 11 through leg piece projecting holes 37 provided in the hub bottom wall 11.

The lock member 19 is engaged and guided by a guide protrusion 27 provided on the inner surface side of the upper wall 12 of the main body case 1 so as to be slidable up and down but cannot be rotated relative to the lower surface side of the lock member 19. The upper surface of 21 is in point contact with a protrusion 30 protruding from the center of either one.

Drive teeth 14 that engage with the drive teeth 16 of the drive shaft D of the tape drive are annularly provided on the outer lower surface of the hub bottom wall 11 .

(Operation) tape reel 2 when not in use, the locking member 19 which is biased depressed by a spring 20 as shown in FIG. 1 has engaged with the hub bottom wall 11 of the tape reel 2 side, which in a rotationally fixed manner Is held in. When the lock release member 2 1 a leg piece 35 to operate the push-up in the drive shaft D of the tape drive, pushed up against the locking member 19 the spring 20 as shown in FIG. 3, Li Rurokku state is released.

  The reason why the lock member 19 is pushed up via the lock release member 21 is to enable the lock member 19 to always be pushed up horizontally. For this purpose, the unlocking member 21 is provided with a plurality of leg pieces 35 of the same length that are pushed up by the drive shaft D. For example, when the lock member 19 is directly pushed up by the drive shaft D, if the center of the lock member 19 and the drive shaft D is not correctly aligned, the lock member 19 is inclined in one of the radial directions. If the unlocking member 21 is pushed up via a plurality of leg pieces 35 having the same length, the unlocking member 21 can be horizontally moved even if there is a slight misalignment between the center of the unlocking member 21 and the drive shaft D. Can be pushed up. As a result, the lock member 19 can be pushed up horizontally as much as the lock release member 21 is pushed up, and the lock teeth 24 are reliably detached from the lock teeth 25.

Lock in contact click central release member 21 or the lower surface and the upper surface transgression point of the unlocking member 21 of the locking member 19 via a protrusion 30 which projects from one of the lower surface side center of the locking member 19, . Therefore, even when the tape reel 2 rotates at high speed, the frictional resistance between the lock release member 21 that rotates with the tape reel 2 and the lock member 19 in the stopped state can be reduced, and the lock member 19 and the lock release member 21 wear. Damage can be well prevented.

According to the present invention, by disposing the unlocking member 21 between the lock member 19 and the hub bottom wall 11 and pushing up the plurality of leg pieces 35 provided on the unlocking member 21 with the drive shaft D, The reel locked state by the lock member 19 can be released. Therefore, the locking member 19 can be prevented from tilting during the unlocking operation, so that the locking member 19 is reliably detached from the hub bottom wall 11 . As a result, the tape 3 can be prevented from being pulled out while the tape reel 2 is locked, and accidents such as tape breakage can be prevented.

The lower surface side of the lock member 19 and the upper surface of the lock release member 21 are in point contact with a protrusion 30 protruding from the center of either one. Accordingly, the frictional resistance between the lock member 19 and the lock release member 21 can be reduced even when the tape reel 2 rotates at high speed, and the durability against friction can be improved and the durability can be improved.

  When releasing the lock, the plurality of leg pieces 35 are pushed up at a position away from the center of the reel. Therefore, the lock release member 21 can be reliably prevented from tilting in the radial direction, and the lock member 19 can be stably moved. It can be supported and pushed up horizontally, and the tape reel 2 can be reliably unlocked.

  1 to 4 show an embodiment of a single reel type magnetic tape cartridge according to the present invention. In FIG. 2, the magnetic tape cartridge accommodates one tape reel 2 inside a rectangular box-shaped main body case 1, and a magnetic tape 3 (hereinafter simply referred to as a tape) is wound around the tape reel 2. A loading pin 4 for pulling out the tape 3 is connected to the feeding end of the tape 3. The loading pin 4 is accommodated inside the tape outlet 5 opened at the front right corner of the main body case 1 and is positioned by engaging and holding the upper and lower ends thereof with holders 6 and 6. The tape outlet 5 can be opened and closed by a shutter 7 that can be freely opened and closed.

  As shown in FIG. 1, the tape reel 2 includes an upper flange 8 and a lower flange 9, and a bottomed cylindrical hub 10 that is formed integrally with the lower flange 9 and opens upward. The upper flange 8 is welded and fixed to the upper end of the hub 10 so as not to be separated. A reel lock mechanism is provided between the inner upper surface of the hub bottom wall 11 of the tape reel 2 and the upper wall 12 of the main body case 1 to prevent the idle rotation of the tape reel 2 when not in use. A magnetic body 13 such as a circular iron plate is fixed at the center of the outer bottom surface of the hub bottom wall 11, and drive teeth 14 are provided in an annular shape so as to surround the periphery of the magnetic body 13 (see FIG. 4). The drive teeth 14 are formed of a group of gear teeth extending in the radial direction, and engage with the drive teeth 16 provided around the magnet 15 provided on the upper end surface of the drive shaft D of the tape drive. Inherits rotational force. The drive teeth 14 are exposed to the outer surface of the case through a drive shaft insertion opening 18 provided in the case bottom wall 17.

  1 and 3, the reel lock mechanism includes a lock member 19 incorporated between the hub bottom wall 11 of the tape reel 2 and the upper wall 12 of the main body case 1 facing above, a lock member 19, A compression coil-shaped spring 20 disposed between the wall 12 and a lock release member 21 disposed between the lock member 19 and the inner upper surface of the hub bottom wall 11 are configured.

  The lock member 19 includes a cylindrical body 22 concentrically built in the hub 10 of the tape reel 2 and a horizontal spring receiving wall 23 integrally formed in the cylindrical body 22. Lock teeth 24 are provided on the entire periphery of the lower end of each of the two, and these lock teeth 24 engage with lock teeth 25 provided radially in the outer peripheral area of the inner upper surface of the hub bottom wall 11.

  A cylindrical slide boss 26 protrudes upward from the center of the upper surface of the spring receiving wall 23, and the slide boss 26 is externally fitted to a guide protrusion 27 that is provided vertically on the inner surface of the upper wall 12. A vertical groove 28 is formed in a part of the circumference of the upper end of the slide boss 26, and the lock member 19 is inserted into a vertical rib 29 provided in a part of the outer periphery of the guide protrusion 27. Thus, it is possible to slide up and down, but the relative rotation is impossible. In this regard, for example, the hole of the slide boss 26 may be formed in a polygonal shape, and the guide protrusion 27 may be formed in a polygonal cross section correspondingly.

  The lock member 19 prevents the rotation of the tape reel 2 by engaging the lock teeth 24 with the lock teeth 25 in the hub 10. The rotation prevention state of the tape reel 2 is held by the pressing biasing force of the spring 20 mounted between the upper wall 12 and the spring receiving wall 23 so as to surround the outer periphery of the guide protrusion 27 and the slide boss 26.

  In order to minimize the frictional resistance between the spring receiving wall 23 and the unlocking member 21 when the tape reel 2 is rotationally driven, a conical or partially spherical protrusion is formed at the center of the lower surface of the spring receiving wall 23 of the lock member 19. 30. The protrusion 30 makes point contact between the lower surface side of the spring receiving wall 23 of the lock member 19 and the upper side of the lock release member 21. In the illustrated example, the protrusion 30 protrudes from the center of the lower surface of a disc 31 that is separate from the lock member 19, and the disc 31 is overlapped with the lower surface of the spring receiving wall 23 to provide a plurality of discs 31. The projections 30 are set at the center of the lower surface of the spring receiving wall 23 by inserting and engaging the respective locking claws 32 into the locking holes 33 provided in the spring receiving wall 23 and fixing them. Thus, after forming the locking member 19 and the protrusion 30 separately, and integrating both, the material of both can be changed. For example, the protrusions 30 that require wear resistance can be molded from a resin such as polyacetal, and the lock member 19 can be molded from a less expensive ABS resin, PS resin, or the like.

  The unlocking member 21 is made of synthetic resin having excellent wear resistance and self-lubricating properties such as acetal resin and nylon resin, and a plurality of circular bases 34 and a plurality of (3 in the illustrated example) projecting downward from the outer peripheral edge of the lower surface thereof. And the leg pieces 35 of the same length are integrally formed. The leg pieces 35 are equidistant from the center of the lower surface of the base body 34 and project from each other at equal intervals. That is, as shown in FIG. 4, a plurality of leg pieces 35 are provided on the same virtual circle C drawn around the lower surface of the base body 34 so as to be arranged at equal intervals.

  A metal plate 36 such as a stainless steel plate is laminated and integrated on the upper surface of the substrate 34. The metal plate 36 is insert-molded on the upper surface thereof simultaneously with the formation of the base 34. However, instead of this, the metal plate 36 may be integrally bonded to the upper surface of the base body 34 with an adhesive.

  In the unlocking member 21, the base body 34 is received and supported on the inner upper surface of the hub bottom wall 11, and each leg piece 35 projects downward from the outer lower surface of the hub bottom wall 11 through the leg piece projecting hole 37. To do. The leg piece projecting hole 37 is provided between the driving tooth 14 of the hub bottom wall 11 and the magnetic body 13.

  In the reel lock mechanism configured as described above, as shown in FIG. 1, the lock member 19 is held non-rotatable by the guide protrusion 27 and is always pushed down by the spring 20. Further, lock teeth 24 and 25 provided on the lock member 19 and the hub bottom wall 11 are engaged with each other. Therefore, the tape reel 2 in the non-use state can be locked and held so as not to rotate.

  In use, when the tape drive is loaded, the shutter 7 is opened and the loading pin 4 is captured by the loading mechanism. At the same time, as shown in FIG. 3, the tape reel 2 is attracted downward by the magnet 15 of the drive shaft D via the magnetic body 13, and at the same time, the drive teeth 16 of the drive shaft D and the drive teeth 14 on the tape reel 2 side are brought together. Engage. During this engaging operation, the leg piece 35 of the unlocking member 21 is pushed up by the drive shaft D and pushed into the leg piece projecting hole 37. As a result, the lock release member 21 pushes up the lock member 19 against the spring 20 and releases the lock teeth 24 and 25 engaged so far to release the reel lock state. As a result, the tape reel 2 can be rotated, and the tape 3 can be driven out or taken up. Thereafter, when the drive shaft D is separated from the tape reel 2, the tape reel 2 is again locked and held.

  In the above embodiment, the protrusion 30 is provided separately from the spring receiving wall 23 at the center of the lower surface of the spring receiving wall 23. Instead, the protrusion 30 is integrally projected and formed at the center of the lower surface of the spring receiving wall 23. You can also. In this case, the lock member 19 is preferably formed of a polyacetal resin having wear resistance and self-lubricating property. As shown in FIG. 5, the lower surface of the spring receiving wall 23 may be formed flat, and the protrusion 30 may bulge upward at the center of the metal plate 36 of the unlocking member 21.

It is the sectional view on the AA line in FIG. It is an internal top view of a magnetic tape cartridge. It is a vertical front view in the unlocked state. It is a BB line arrow directional view in FIG. It is a vertical front view which shows another Example corresponding to FIG. It is a vertical front view which shows the comparative example of a reel lock mechanism.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Tape reel 10 Hub 11 Hub bottom wall 12 Upper wall 14 of main body case Tape reel drive tooth 16 Drive shaft drive tooth 17 Case bottom wall 18 Drive shaft insertion port 19 Lock member 20 Spring 21 Unlock member 22 Tube Body 23 Spring receiving wall 27 Guide projection 30 Projection 34 Base 35 Leg piece 36 Metal plate 37 Leg piece projection hole D Drive shaft

Claims (5)

Inside the main body case, a tape reel is rotatably accommodated on the drive shaft insertion port of the case bottom wall,
The tape reel has a bottomed cylindrical hub whose upper surface opens at the center, and the outer lower surface of the hub bottom wall of the hub faces the drive shaft insertion port,
In the magnetic tape cartridge provided with a reel lock mechanism between the inner upper surface of the hub bottom wall and the upper wall of the main body case to prevent the idle rotation of the tape reel when not in use.
The reel lock mechanism is disposed between a lock member that moves up and down, a spring that presses and urges the lock member into engagement with the hub bottom wall, and an inner upper surface of the hub bottom wall. An unlocking member,
The lock member has a cylindrical body built in the hub of the tape reel, and a spring receiving wall provided inside the cylindrical body, and is engaged with the bottom wall of the hub to engage the tape reel. To stop moving,
A single-reel type magnetic tape cartridge, wherein a plurality of leg pieces of the same length project downward from the unlocking member so as to face an outer lower surface of the hub bottom wall .   2. The single reel type magnetic tape cartridge according to claim 1, wherein the plurality of leg pieces are disposed at equal distances from the center of the lower surface of the unlocking member and at equal intervals.   3. A single reel type magnetic tape cartridge according to claim 2, wherein the lower end of each leg piece projects downward from the outer lower surface of the hub bottom wall via a leg piece projecting hole provided in the hub bottom wall. The lock member is slidably moved up and down by a guide protrusion provided on the inner surface side of the upper wall of the main body case, but is engaged and guided so that relative rotation is impossible.
3. The single reel type magnetic tape cartridge according to claim 1, wherein a lower surface side of the lock member and an upper surface of the lock release member are in point contact with a protrusion protruding from one of the centers.   2. The single reel type magnetic tape cartridge according to claim 1, wherein a drive tooth that engages with a drive tooth of a drive shaft of a tape drive is annularly provided on an outer lower surface of the hub bottom wall.

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