JP2007095161A - Single reel type tape cartridge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single reel type tape cartridge capable of eliminating the absorption of an absorption plate by a release pin, dissolving engaging errors and smoothly performing automatic loading even when applied to an existing tape drive by improving the structure of a tape passing port. <P>SOLUTION: A magnetic tape 2 and the tape reel 3 for winding and storing the magnetic tape 2 are provided inside a main body case 1. On the bottom wall of the reel boss 9 of the tape reel 3, the attraction plate 12 to be attracted by a magnet 16 provided on a drive shaft 10 is arranged. On the center of the bottom wall of the reel boss 9, a pin passing port 14 for permitting the advance of the release pin 17 for unlocking is provided. A magnetism insensitive part 34 composed of a nonmagnetic material is formed around the pin passing port 14, the absorption of the absorption plate 12 by the magnetized release pin 17 is dissolved, and thus the engaging error is eliminated. The magnetic insensitive part 34 is constituted by fixing a magnetic shield body 35 formed of the nonmagnetic material at the center of the attraction plate 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a single reel type tape cartridge in which a suction plate that is magnetically attracted to a bottom wall of a tape reel is provided.

  In single-reel tape cartridges, the drive shaft of the tape drive and the tape reel are gear-coupled, and the tape reel is rotated with a suction plate fixed to the bottom wall of the tape reel attracted by a magnet provided on the drive shaft. Drive (see Patent Document 1). A release pin for unlocking the reel lock mechanism of the tape cartridge is provided at the center of the upper surface of the drive shaft.

JP 2004-273014 A (paragraph number 0036, figure)

  The unlocking pin for unlocking is disposed adjacent to the central part of the magnet and is itself formed of steel, so that it is magnetized by the magnet and exerts a magnetic force. Therefore, when the tip shaft portion of the release pin passes through the pin opening, the suction plate may be attracted to the release pin, and the center of the tape reel may deviate from the center of the drive shaft. Thus, if the center is shifted, the drive gear and the passive gear cannot be properly meshed, resulting in a meshing error. When a meshing error is recognized, the tape cartridge that has been transported to the drive position is once returned to the eject position side and then re-transferred to the drive position to mesh the gear teeth, but the gear teeth cannot be meshed. In this case, the tape drive may stop.

  In most cases, this type of tape cartridge is removed from a predetermined storage position by an automatic loading device and loaded into a tape drive. Therefore, frequent occurrence of the above-mentioned engagement errors not only impairs the reliability of the tape cartridge, but also takes extra time for repeated loading operations, and reads and rewrites information recorded on the magnetic tape. Cannot be performed smoothly.

  An object of the present invention is to eliminate the misalignment of gear teeth by eliminating the fact that the suction plate is attracted to the release pin and shifting the center of the tape reel, and facilitating the loading of the tape cartridge by the automatic loading device. It is to improve the reliability. The object of the present invention is to improve the structure of the tape opening so that the suction of the suction plate by the release pin is eliminated to eliminate the misengagement, and even when applied to an existing tape drive, a single reel that can be smoothly and automatically loaded. To provide a shaped tape cartridge.

  In the tape cartridge of the present invention, a magnetic tape 2 and a tape reel 3 that encloses and stores the magnetic tape 2 are arranged inside a main body case 1. On the bottom wall of the reel boss 9 of the tape reel 3, an attracting plate 12 that is attracted by a magnet 16 provided on the drive shaft 10 of the tape drive is disposed. In the center of the bottom wall of the reel boss 9, a pin opening 14 that allows the unlocking release pin 17 to enter is formed. A magnetic insensitive portion 34 made of a nonmagnetic material is formed around the pin opening 14.

  The magnetic insensitive part 34 is configured by fixing a magnetic shield 35 made of a nonmagnetic material to the center of the suction plate 12, and forms the pin opening 14 at the center.

  The magnetic insensitive part 34 is configured by a magnetic shield wall 36 that is formed integrally with the bottom wall 9 a of the reel boss 9, and the pin opening 14 can be formed in the magnetic shield wall 36.

  In the present invention, a magnetic insensitive portion 34 made of a nonmagnetic material is formed around the pin opening 14 provided on the bottom wall of the reel boss 9 so that the suction plate 12 is magnetically attracted to the magnetized release pin 17. The dead part 34 can be blocked. Therefore, it is possible to eliminate the fact that the suction plate 12 is attracted to the release pin 17 and the center of the tape reel 3 is shifted in the radial direction at the time of tape loading, so that the gear teeth 18 and 31 are not misengaged. Thereby, the tape cartridge can be smoothly loaded by the automatic loading device, and the reliability of the tape cartridge is improved. Furthermore, since the magnetic insensitive portion 34 is provided, the suction plate 12 is wiped away from being attracted in the radial direction, so that even if it is applied to an existing tape drive, the meshing error is eliminated and the tape cartridge is automatically loaded. It can be smoothed.

  When the magnetic shield 35 formed of a non-magnetic material is fixed to the center of the suction plate 12 to form the magnetically insensitive portion 34, the structure change can be made by partially changing the structure of the suction plate 12 to eliminate the meshing error. This is advantageous in that the cost required for the process can be reduced and an improved tape cartridge can be provided at a low cost.

  According to the tape cartridge in which the magnetically shielded wall 36 is formed integrally with the bottom wall 9a of the reel boss 9 to form the magnetically insensitive part 34, the magnetically insensitive part 34 can be configured by partially changing the molding die. The pin opening 14 formed simultaneously with the wall 36 is advantageous in that a high degree of positional accuracy and shape accuracy can be obtained.

(Embodiment) FIGS. 1 to 6 show an embodiment of a single reel type tape cartridge according to the present invention. In FIG. 2, the tape cartridge is configured by storing the magnetic tape 2 in a state where the magnetic tape 2 is wound around one tape reel 3 inside the rectangular box-shaped main body case 1, and a leader block is provided at the feeding end of the magnetic tape 2. 4 is connected.

  The leader block 4 is fixed and held facing a tape outlet 5 opened at one corner of the front surface of the main body case 1, and the magnetic tape 2 is captured by the loading pin of the tape drive to capture the magnetic tape 2. It can be drawn out of the tape, passed through a predetermined tape path, and then delivered to the take-up reel. The main body case 1 is formed by joining an upper case 1a and a lower case 1b, which are divided and formed, in a lid-like manner.

  In FIG. 1, the tape reel 3 includes a pair of upper and lower flanges 7 and 8 and a bottomed cylindrical reel boss 9 formed integrally with the lower flange 8, and the magnetic tape 2 is disposed around the reel boss 9. Get involved.

  A passive gear 11 that inherits the rotational power of the drive shaft 10 of the tape drive is formed on the lower surface side of the bottom wall of the reel boss 9, and a suction plate 12 made of an iron plate is fixed inside the passive gear 11. The passive gear 11 and the suction plate 12 are separated by a ring wall 13 that surrounds the periphery of the suction plate 12.

  The shaft end of the drive shaft 10 is provided with a face gear-like drive gear 15 that meshes with the previous passive gear 11, a magnet 16 that attracts the suction plate 12, and a release pin 17 for unlocking. The upper end of the release pin 17 is formed with a shaft portion 17a having a smaller diameter than the other rounded periphery, and a tapered surface 17b continuous with the lower end of the shaft portion 17a, thereby reducing thrust friction on the end surface of the shaft portion 17a. A bearing piece 17c is embedded.

  The bearing piece 17c is formed in a disc shape with a plastic material excellent in lubricity and wear resistance, and comes into contact with the lower surface of a later-described receiving shaft 25 in a state where the reel lock mechanism is unlocked. As shown in FIG. 4, the gear teeth 18 constituting the drive gear 15 are formed in a trapezoidal cross section, and the tooth tip surfaces thereof are formed flat. Reference numeral 19 denotes a tooth gap. In addition, the gear tooth 31 and the tooth groove 32 of the passive gear 11 are each formed in a cross-sectional triangle shape, and the tooth tip surface and the tooth groove bottom are respectively rounded.

  In a non-use tape cartridge, a reel lock mechanism is disposed between the bottom wall of the reel boss 9 and the upper case 1a in order to prevent the tape reel 3 from floating in the main body case 1 and sagging the magnetic tape 2. is there.

  1 and 5, the reel lock mechanism engages and holds the tape reel 3 in a non-rotatable manner by engaging with the first lock teeth 21 formed in a ring shape on the inner surface of the bottom wall of the reel boss 9 and the first lock teeth 21. A disk-shaped lock body 22 and a compression coil spring 23 that presses and urges the lock body 22 toward the first lock teeth 21 are included.

  On the lower surface of the lock body 22, a ring-shaped second lock tooth 24 that meshes with the first lock tooth 21 and a receiving shaft 25 that is pushed up by the release pin 17 are integrally formed. A slide boss 27 having a long cylindrical cross section is formed at the center of the upper surface of the lock body 22, and the lock body 22 is guided by a guide projection 28 provided on the inner surface of the upper case 1 a. It supports up and down sliding, but cannot rotate.

  As shown in FIG. 1, the lock body 22 in a non-use state is pushed down by a spring 23 and its second lock teeth 24 mesh with the first lock teeth 21, so that the rotation of the tape reel 3 can be restricted.

  In such a tape cartridge, when the automatic loading device is loaded into the tape drive, the suction plate 12 is attracted by the magnetized release pin 17 so that the center of the tape reel 3 is not shifted. A disk-shaped magnetic shield 35 made of a nonmagnetic material was fixed to form a magnetic insensitive portion 34, and a pin opening 14 was formed at the center thereof. The magnetic shield 35 is made of a nonmagnetic material such as a plastic material or a nonmagnetic metal, and is bonded and fixed to the suction plate 12.

  As described above, when the magnetic insensitive part 34 made of a nonmagnetic material is formed around the pin opening 14, the adjacent distance between the suction plate 12 and the release pin 17 can be increased by the amount of the magnetic shield 35. Therefore, when the release pin 17 enters the inside of the reel boss 9 through the pin passage 14, it is possible to reliably prevent the suction plate 12 from being attracted to the magnetized release pin 17. This can reliably prevent the center position of the tape reel 3 from shifting in the radial direction.

  As shown in FIG. 5, in the state where the lock body 22 is completely unlocked by the release pin 17, the drive gear 15 and the passive gear 11 can be properly engaged, and the suction plate 12 is attracted by the magnet 16. Thus, the engaged state of both the gears 11 and 15 can be maintained.

  When the tape cartridge is ejected, the release pin 17 comes out of the pin hole 14, but at this time, the suction plate 12 can be prevented from being attracted by the magnetized release pin 17, so that the center of the tape reel 3 is Thus, it is possible to prevent the reel lock mechanism from being locked and fixed in a state shifted from the main body case 1.

  FIG. 6 shows another embodiment of the present invention relating to the magnetic insensitive portion 34. In this case, the magnetic insensitive part 34 is constituted by a magnetic shield wall 36 formed integrally with the bottom wall 9 a of the reel boss 9, and the pin opening 14 is formed at the center of the magnetic shield wall 36. Thus, when the magnetic insensitive part 34 is integrated with the reel boss 9, the pin opening 14 can be formed simultaneously with the molding of the magnetic shield wall 36, so that the magnetic insensitive part 34 is formed separately from the suction plate 12. In comparison, the positional accuracy and shape accuracy of the pin opening 14 can be improved.

  In the above embodiment, the magnetic shield 35 is formed in a disk shape. However, the pin shield 14 may be formed in the center of the bottom wall by forming the magnetic shield 35 in a bottomed cylindrical shape, for example. The magnetic shield 35 is formed of a cylindrical body that is open at the top and bottom, and a flange wall that projects from the top of the cylindrical body can be welded and fixed to the inner surface of the bottom wall 9 a of the reel boss 9.

It is the sectional view on the AA line in FIG. It is an internal top view which shows schematic structure of a tape cartridge. It is a disassembled perspective view which shows the drive structure of a tape reel. It is sectional drawing which shows the gear tooth profile of a passive gear and a drive gear. It is sectional drawing which shows the drive state of a tape reel. It is sectional drawing of the principal part which shows another Example of a tape reel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body case 2 Magnetic tape 3 Tape reel 9 Reel boss 10 Drive shaft 12 Suction plate 14 Pin opening 16 Magnet 17 Release pin 34 Magnetic insensitive part 35 Magnetic shield

Claims (3)

Inside the main body case, a magnetic tape and a tape reel that encloses and stores the magnetic tape are arranged,
A pin through which a suction plate attracted by a magnet provided on a drive shaft of the tape drive is disposed on the bottom wall of the reel boss of the tape reel, and allows the release pin for unlocking to enter the center of the bottom wall of the reel boss. Is formed,
A single reel type tape cartridge, wherein a magnetic insensitive part made of a non-magnetic material is formed around the pin hole. The magnetic insensitive part is configured by fixing a magnetic shield formed of a nonmagnetic material to the center of the suction plate,
2. The single reel type tape cartridge according to claim 1, wherein the pin opening is formed in the center of the magnetic shield. The magnetic insensitive part is composed of a magnetic shielding wall formed integrally with the bottom wall of the reel boss,
The single reel type tape cartridge according to claim 1, wherein the pin opening is formed in the magnetic shielding wall.

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