JP2000030403A - Magnetic tape cartridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic tape cartridge capable of completely closing a delivery port for a recording medium such as a magnetic tape. SOLUTION: This magnetic tape cartridge is provided with a magnetic tape reel housed in upper and lower cartridge halves 2a and 2b, a magnetic tape being wound thereon, a lid 30 provided in an opening part for pulling out the magnetic tape, a bearing part thereof being freely rotatably fixed to a spindle provided in the upper cartridge half 2a, a lid spring fixed to the spindle of the upper cartridge half 2a and having a twist coil spring 15 for pressing the lid 30 in a closing direction, and a lid locking member fixed to the vicinity of the bearing part of the lid 30 and urged to the lower half cartridge 2b by a compression spring provided in the lid 30. Correcting means 122a, 122b, 130a and 130b are provided for guiding the lid 30 to a closing position by correcting an inclined attaching state caused by the effect of play between the upper and lower cartridge halves 2a and 2b and the lid 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape cartridge, and more particularly to a lid mounting structure for opening and closing an opening for pulling out a tape of a magnetic tape cartridge.

[0002]

2. Description of the Related Art FIG. 5 is an exploded perspective view of a magnetic tape cartridge 1 used as a data recording medium of a computer or the like.

The magnetic tape cartridge 1 is known as a one-reel type. The magnetic tape 20 is wound around a single reel 3 on which an upper reel 4 and a lower reel 5 are ultrasonically welded. The reel 3 is rotatably housed in a cartridge case in which an upper cartridge half 2a and a lower cartridge half 2b are fastened by screws 19.

The upper reel 4 has a disk-shaped upper flange 4.
A concave boss 4b is provided at the center of FIG. A gear 4c is formed on the outer periphery of the upper flange 4a.

A ring-shaped bearing 6 is press-fitted and fixed in a cylindrical rib formed in the recess 4b, and a spring plug 7 is press-fitted and fixed in a hole in the center of the bearing. Then, a reel spring 8 is attached to the spring plug 7.
Is attached, and presses the reel 3 downward and holds the reel 3 rotatably.

When the cartridge is not used, the reel 3 is locked by a reel brake 50, 51 appropriately biased by a brake torsion spring 12 so as not to rotate unexpectedly. When the magnetic tape cartridge 1 is not in use, the magnetic tape 20 is completely wound around the reel 3 with the leader tape 54 attached to the end of the magnetic tape.
(Means for the recording / reproducing device to introduce the magnetic tape 20 into the tape path) is locked to the tip of the hook 18 incorporated near the side of the cartridge.

An opening 56 for drawing out the magnetic tape 20
, A lid 30 that can be opened and closed in the cartridge plane direction is appropriately biased by a lid biasing torsion coil spring 15 and attached to the support shaft 14. When the cartridge is not used, the lid 30 is locked by a lock member 40 appropriately urged by the compression spring 16 so as not to rotate. A write protector 17 is incorporated on the side opposite to the lid 30.

The leader tape 21 which engages with the engaging means for introducing the magnetic tape 20 into the tape path of the recording / reproducing apparatus is, for example, spliced.
Is connected to

[0009]

By the way, the lid 30
7, a reaction force that urges the lock member 40 toward the lower cartridge half 2b by the compression spring 16 acts on the lower cartridge half 2b. As shown in FIG. 7, this reaction force causes the lid 30 to rotate counterclockwise in FIG. Act like so. On the other hand, the hole 123 of the lid 30 is fitted to the support shaft 14 with play (play) in order to limit molding accuracy and prevent clogging of wear powder. Therefore, when the lid 30 is closed by the action of the coil spring 15, as shown in FIG. 7, a part of the lid 30 may overlap the edge of the opening 56 for drawing out the magnetic tape, and the opening 56 may not be closed. It can happen. As described above, if the opening 56 is left in a state where it is not closed, dust invades from the gap and adheres to the magnetic tape, thereby causing data dropout.

An object of the present invention is to solve the problems of the prior art, and to provide a magnetic tape cartridge in which an opening for pulling out a magnetic tape can be reliably closed by a lid. .

[0011]

The object of the present invention is to provide a magnetic tape reel which is housed in upper and lower cartridge halves and has a magnetic tape wound thereon, and an opening for pulling out the magnetic tape, which can be opened and closed. A lid having a bearing portion rotatably mounted on a support shaft provided in the upper cartridge half; and a torsion coil spring mounted on the support shaft of the upper cartridge half and biasing the lid in a closing direction. A magnetic tape cartridge comprising a lid spring, and a lid lock member mounted near a bearing portion of the lid and urged to a lower half cartridge by a compression spring provided in the lid, wherein the upper and lower cartridge halves and the lid To correct the inclined mounting state due to the effect of the reaction that biases the lid lock member, and moves the lid to the closed position. Inner correcting means is achieved by a magnetic tape cartridge, characterized in that provided.

According to this configuration, in order to limit molding accuracy and prevent clogging of wear powder, the compression spring provided on the lid biases the lock member with the lid hole being enlarged with respect to the support shaft. Even if a reaction force acts on the lid, the lid can be properly guided to the predetermined position of the tape pull-out opening by the correcting means, so that the lid can reliably close the opening.

[0013] As the correcting means, for example, a configuration in which upper and lower bearings formed on the lid are formed with their axes shifted from each other can be adopted. According to this configuration,
Even if a reaction force urging the lock member by the compression spring provided on the lid acts on the lid, the side wall of the hole hits the support shaft, so that the lid is prevented from tilting with respect to the upper and lower cartridge halves.

Further, as the correcting means, a concave portion for holding a tip of the support shaft to regulate a position of the support shaft and a shaft center of the support shaft are shifted in a state where both cartridge halves are overlapped. And the support shaft is held in an inclined state with respect to the upper and lower cartridge halves. According to this configuration, even if the compression spring provided on the lid applies a reaction force urging the locking member to the lid, the peripheral surface of the support shaft hits the side wall of the lid hole. Is prevented.

Further, as the correcting means, it is possible to adopt a configuration in which a rib having an inclined surface is provided in the lid rotation area of the one cartridge half. According to this configuration, the lid is guided to the predetermined position of the opening of the cartridge by the guide surface.

Further, as the correcting means, a configuration in which an inclined surface is formed at an edge of the lid on the cartridge half side can be adopted. According to this configuration, the lid is guided to the predetermined position of the opening of the cartridge by the inclined surface of the lid.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 conceptually shows a first embodiment of a magnetic tape cartridge according to the present invention. A torsion coil spring 15 is fitted on a support shaft 14 protruding from an upper cartridge half 2a, and a lid 30 is further provided. Holes 123a, 123b of ribs 122a, 122b formed in
Are fitted, and then the recess 125 of the lower cartridge half 2b is fitted.

In this magnetic tape cartridge, the rib 1
22a, 122b of the hole 123a, and the axis of 23b are offset by a distance S ₁ from each other. And lid 3
At 0, the urging force of the torsion coil spring 15 acts in the counterclockwise direction (the direction of the arrow) in FIG. 1, but the side wall 130a on the base end side of the lid 30 in the hole 123a comes into contact with the peripheral surface of the support shaft 14, and The side wall 130b of the front end side of the lid 30 at 123b abuts on the peripheral surface of the support shaft 14 to prevent the lid 30 from tilting with respect to the upper and lower cartridge halves 2a, 2b.

FIG. 2 conceptually shows a second embodiment of the magnetic tape cartridge according to the present invention. In this magnetic tape cartridge, the upper cartridge half 2
and a and a lower cartridge half 2b to each other in a mutually superposed state, and the axis of the recess 125 of the axial core and a lower cartridge half 2b of the support shaft 14 of the upper cartridge half 2a by a distance S ₂ that is offset. Therefore, the recess 12
Support shaft 14 is fitted a tip 5 is assembled in a deflected condition tip distance S _2. Also in this case, lid 3
2, the biasing force of the torsion coil spring 15 acts in the counterclockwise direction (the direction of the arrow) in FIG. 2, but the side wall 130a on the base end side of the lid 30 in the hole 123a contacts the peripheral surface of the support shaft 14, and The side wall 130b of the front end side of the lid 30 at 123b abuts on the peripheral surface of the support shaft 14 to prevent the lid 30 from tilting with respect to the upper and lower cartridge halves 2a, 2b.

FIG. 3 conceptually shows the third and fourth embodiments of the magnetic tape cartridge according to the present invention, in which a slope is formed in the movement area of the lid 30 of the lower cartridge half 2b. In the third embodiment, as shown by the arrow A, the upper surface of the seat 131 formed on the periphery of the concave portion 125 with which the lid 30 comes into contact is moved toward the distal end in the closed state of the lid 30 as indicated by arrow A in the third embodiment. The inclined surface 131a is formed to be higher toward the front. In this case, lid 3
When the lid 30 is closed, the lid 30 is guided by the inclined surface 131a of the seat 131 as the lid 30 is closed.
0 is lifted and guided to a predetermined position of the opening 56. The seat 131 with which the lid 30 contacts may not be an inclined surface, and a rib having such an inclined surface may be provided as a separate member from the seat 131 in the vicinity of the seat 131.

In the fourth embodiment, the edge of the opening 56 of the lower cartridge half 2b is formed as an inclined surface 132 as a movement area of the lid 30, as shown by arrow B. In this case, when the lid 30 performs the closing operation, the lid 30 is guided by the inclined surface 132 as the lid 30 is closed, and the tip of the lid 30 is gradually lifted and guided to a predetermined position of the opening 56. In the fourth embodiment, it is preferable to change the shape of the inclined surface 132 at the distal end portion (CC section) and the proximal end portion (DD section) of the lid 30.
That is, as is clear from the CC cross-sectional view and the DD cross-sectional view, the inclined surface 32a at the distal end portion is steeply inclined, and the inclined surface 32b at the proximal end portion is formed gently.

FIG. 4 conceptually shows a fifth embodiment of the magnetic tape cartridge according to the present invention. In this embodiment, the inclined surface 33 is formed on the lower cartridge half side edge of the lid 30. Also in the case of this inclined surface 33,
Like the inclined surface 32 of the above-described fourth embodiment, the inclination is made steeper toward the tip of the lid 30.

[0023]

As is clear from the embodiments described above, in the magnetic tape cartridge of the present invention, in order to limit molding accuracy and prevent clogging of abrasion powder, a lid hole is formed with respect to the support shaft. Even if it is enlarged, since the lid is guided to a predetermined position of the opening of the cartridge by the correcting means, incomplete closing of the lid can be prevented. In addition, generation of shavings due to the lid colliding with the edge of the opening of the cartridge is also eliminated, and errors related to data such as dropout due to the generation of shavings can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view conceptually showing a main part of a magnetic tape cartridge according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the magnetic tape cartridge according to the present invention and conceptually showing a main part thereof.

FIG. 3 is a perspective view showing third and fourth embodiments of the magnetic tape cartridge according to the present invention.

FIG. 4 is a perspective view showing a fifth embodiment of the magnetic tape cartridge according to the present invention.

FIG. 5 is an exploded perspective view showing the magnetic tape cartridge.

6 is an exploded perspective view of a main part showing a mounting structure of an opening for pulling out a tape and a lid of the magnetic tape cartridge shown in FIG. 5;

FIG. 7 is a front view showing a closed state of a lid in a conventional magnetic tape cartridge.

[Explanation of symbols]

 Reference Signs List 1 cartridge 2a upper cartridge half 2b lower cartridge half 3 magnetic tape reel 14 support shaft 15 torsion coil spring 16 coil spring 30 lid 40 lid lock 122, 122a, 122b rib 123, 123a, 123b hole 125 recess 130a, 130b side wall 131 seat 131a Slope 132,133 Slope

Claims (1)

[Claims] Claims: 1. An upper and lower cartridge half,
A magnetic tape reel around which a magnetic tape is wound, a lid provided with an opening for opening the magnetic tape openable and a bearing rotatably mounted on a spindle provided on the upper cartridge half, A lid spring mounted on the support shaft of the upper cartridge half and configured of a torsion coil spring for urging the lid in the closing direction; and a compression spring provided near the bearing portion of the lid and provided on the lid and provided with the lower half. A magnetic tape cartridge having a lid lock member biased by the cartridge, wherein a play between the upper and lower cartridge halves and the lid;
A magnetic tape cartridge, comprising: straightening means for correcting an inclined mounting state due to the reaction of urging the lid lock member and guiding the lid to a closed position.