JPH0538462Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a magnetic tape cartridge, and more particularly, to a magnetic tape cartridge in which a single reel wound with magnetic tape is rotatably housed. It is something.

(Prior Art) Conventionally, magnetic tape cartridges used as recording media for computers, etc. include a magnetic tape cartridge in which magnetic tape is wound around a single reel and the reel is rotatably housed in a case. There is a toritsuji. When this magnetic tape cartridge is not in use, the magnetic tape is completely wound up on the reel, and a leader block (a device such as a computer introduces the magnetic tape into the tape path) is attached to the end of the tape. means to do so)
is removably latched to the tape outlet of the case, and the reel is latched to prevent unexpected rotation.

The above-mentioned reel is equipped with uneven brake teeth along the circumference of its inner periphery, and on the other hand, the brake teeth of the reel are slidably locked in the case thickness direction at the center of the reel rotation. A brake button is provided with brake teeth engaging the teeth. This brake button is biased in the thickness direction of the case by, for example, a coil spring, and when the cartridge is not in use, this biasing force causes the brake teeth to engage with the brake part of the reel, preventing unexpected rotation of the reel. configured to prevent movement. Also, when the cartridge is in use, it is loaded into a device such as a computer, and for example, a rotating shaft (rotating shaft of a motor) enters the case and comes into contact with the brake button, pushing the button against the biasing force of the coil spring. and move it. As a result, the reels are unlocked and ready to rotate.

Then, the leader block that was locked in the tape outlet is pulled out of the cartridge by fitting the pull-out pin provided inside the device, and is integrated with the take-up reel inside the device, allowing the tape to run freely. be able to do so.

As shown in FIG. 3, a conventional leader block is detachably installed at a tape outlet 2 formed in a case 1 of a magnetic tape cartridge. The tape outlet 2 is constructed so that the leader block 3 is properly positioned by the partition wall 9 and the upper and lower walls of the case 1. The tip 4 of the leader block 3 and the side wall 5 of the case 1 are brought into contact with each other, and the structure is such that the leader block 3 can be attached and detached by appropriately deforming the side wall 5.

Therefore, the mounting force and the pulling force of the leader block 3 are determined by the degree of contact between the tip 4 and the side wall 5 when they are attached and detached. Here, when attaching and detaching the leader block 3, a load is repeatedly applied to the pull-out pin, and in order to prevent the pull-out pin from deforming, variations in the attaching force and pull-out force of the leader block should be adjusted. It needs to be smaller and smaller.

Here, case 1 and leader block 3 are
To protect data in the event of an emergency, they must be manufactured from materials that meet flame retardant standards (UL94V-2), and for this reason polycarbonate resin is mainly used. However, flame-retardant plastic resins such as polycarbonate resins have large variations in molding dimensions, and furthermore, although they have high wear resistance, they have a large coefficient of friction, making it difficult to stabilize the force for attaching and detaching the leader block 3.

(Purpose of the invention) The present invention was made in view of the above-mentioned problems, and its purpose is to provide a magnetic tape cartridge configured to stabilize the attachment/detachment force of the leader block. .

(Structure of the invention) The object of the invention is to provide a magnetic tape cartridge in which a single reel wound with magnetic tape is housed, and a leader block holding an end of the tape is detachably attached to a tape outlet. The present invention is achieved by a magnetic tape cartridge characterized in that the tip of the leader block is made of a low-friction coefficient member and makes contact with at least a part of the side wall of the cartridge and appropriately deforms the side wall during attachment and detachment. I can do it.

Hereinafter, embodiments of the present invention illustrated in the drawings will be described.

As shown in FIG. 1, a leader block 3 configured to be detachably attached to a tape outlet 2 formed at a corner of a case 1 of a magnetic tape cartridge clamps the tape end of a magnetic tape T with a clamp member 6. a recess 8 having a substantially cylindrical inner circumferential surface formed for clamping; a drawer engaging portion 7 into which a drawer pin provided in a device such as a computer is appropriately fitted;
The end face 11 and the like that are integrated with the take-up reel in the device and form the outer circumferential surface of the reel are constructed in the same manner as in the prior art.

Further, the leader block 3 is formed with a tip portion 4 that comes into contact with the side wall of the case and deforms the side wall as appropriate for attachment and detachment.

Here, the tip portion 4 is formed by press-fitting an abutment member 10 made of a low friction coefficient material such as polyoxymethylene resin or polyamide resin into the unevenness of the leader block base, and attaches the leader block 3 with tape. When the device is attached to and removed from the outlet, the abutment member 10 abuts the abutment surface of the side wall of the case.

Therefore, the frictional resistance between the leader block tip 4 and the side wall of the case is reduced, and the attachment/detachment force of the leader block 3 can be reduced and stabilized, allowing for dimensional errors of each member to achieve good attachment/detachment force. Setting is extremely easy. Further, an excessive load is not generated between the tip portion 4 and the side wall of the case, and troubles such as damage to the case, damage to the block, and even bending and deformation of the drawer pin can be avoided.

Furthermore, according to the present invention, a low friction coefficient material is used only at the tip of the leader block 3, and a flame retardant material such as polycarbonate resin can be used for the base of the leader block, as in the past, so there is no need to worry. This does not in any way compromise the security of data protection at any time.

In the above embodiment, the tip portion is formed by inserting the abutment member into the unevenness of the leader block base, but the present invention is not limited to this embodiment.
For example, as shown in FIG. 2, a flat contact member 12 made of ultra-high molecular weight polyethylene or the like may be attached around the contact surface of the tip portion 4, and various other configurations are also possible. Furthermore, it goes without saying that the material of the contact member is not limited to polyoxymethylene resin, polyamide resin, polyethylene resin, etc., and other low friction coefficient materials can be used.

(Effects of the invention) As described above, the magnetic tape cartridge of the invention has a low friction member at the tip of the leader block to reduce the frictional resistance between the tip of the leader block and the side wall of the case. The attachment/detachment force can be made small and stable, and the attachment/detachment force can be set extremely easily. Therefore, according to the present invention, a highly reliable magnetic tape cartridge is provided which is free from the dangers of damage to the case, damage to the block, and bending and deformation of the pull-out pin due to excessive load when attaching and detaching the leader block and variations in the attaching and detaching force. can do.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a main part of a magnetic tape cartridge that is an embodiment of the present invention, FIG. 2 is a perspective view of a main part of a magnetic tape cartridge that is another embodiment of the present invention, and FIG. 3 is a conventional FIG. 2 is a schematic plan view of a magnetic tape cartridge of FIG. Symbols in the figure: 1...Case, 2...Tape outlet, 3...Leader block, 4...Tip, 5
... Side wall, 6 ... Clamp member, 7 ... Drawer engaging portion, 8 ... Recess, 9 ... Partition wall, 10, 12 ...
Contact member, 11...end surface.

Claims (1)

[Scope of utility model registration request] In a magnetic tape cartridge in which a single reel of magnetic tape is stored and a leader block holding an end of the tape is detachably attached to a tape outlet, the leader block is attached to at least one side wall of the cartridge. 1. A magnetic tape cartridge, characterized in that a tip part that comes into contact with the side wall and appropriately deforms the side wall during attachment and detachment is made of a low friction coefficient member.