JPH0590627U - Magnetic tape drive - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents irregular winding when rewinding the tape of an open reel type magnetic tape drive. [Arrangement] The arm 10 has a roller 13 rotatably attached to the tip thereof, and operates in conjunction with a loading mechanism that pulls out the magnetic tape T until it comes into contact with the head 7. When the automatic loading is completed, the roller 13 is a supply reel. It comes into contact with the magnetic tape T wound around 1. The contact point of the roller 13 with the magnetic tape T is a position downstream of the winding point P of the magnetic tape T that is rewound from the take-up reel 3 to the supply reel 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic tape driving unit which is a part of a magnetic tape storage device.

[0002]

[Prior Art]

 As a magnetic tape drive unit for feeding a magnetic tape, an open reel type, which has a large storage capacity and a high data transfer rate and a high tape speed, is widely used, in addition to the cassette type and the cartridge type. The drive type of this open reel type is that the end of the magnetic tape wound on a single supply reel is automatically or manually fed out and wound on a take-up reel, and the take-up reel is rotated to rotate the supply reel side. The magnetic tape is taken up on the take-up side.

[0003]

[Problems to be solved by the device]

 By the way, the open reel type has a higher data transfer rate than the other types, but a higher speed is required. For this purpose, the tape running speed needs to be 100 ips to 200 ips.

However, when the running speed of the tape is increased as described above, when the magnetic tape wound on the take-up reel is rewound on the supply reel, the magnetic tape T is wound by air as shown in FIG. The irregular winding phenomenon occurs in which a part of the magnetic tape T is protruded. When the reel hub 21 of the supply reel 20 is gripped with fingers and taken out in this state, the reel hub 21 bends inward and the protruding portion of the magnetic tape T is broken.

[0005]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides an arm urged to the supply reel side in an open reel type magnetic tape driving device, and at the tip of this arm, a winding point of a magnetic tape to be rewound on a supply reel. A roller that abuts the magnetic tape is rotatably supported at a position downstream of the magnetic tape.

[0006]

[Action]

 When rewinding the magnetic tape from the take-up reel to the supply reel at high speed, the roller at the tip of the arm presses the downstream side position of the winding point of the magnetic tape. By providing a rotation angle sensor on the arm, the amount of magnetic tape wound around the supply reel can be known.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a view showing the internal structure of a magnetic tape drive device according to the present invention, and FIG. 2 is an enlarged perspective view of an arm. The magnetic tape drive device has an opening for inserting and removing a supply reel 1 at one end. 2 is provided, and the take-up reel 3 is arranged at a position facing the supply reel 1.

In addition, inside the drive unit, tension arms 4 and 4 as cushioning members for the magnetic tape T wound between the supply reel 1 and the take-up reel 3, and a capstan for running the magnetic tape T at a constant speed. 5, an idler 6 for changing the direction of the magnetic tape T, a head 7 for recording / reproducing on / from the magnetic tape T, and an arm 10 for preventing irregular winding which is the gist of the present invention are arranged.

As shown in FIG. 2, a base end portion of the arm 10 is rotatably supported by a base plate 12 by a shaft 11, and an intermediate portion is vertically foldable in two, and a roller 13 is rotated at a tip end thereof. It is installed freely.

The arm 10 operates in conjunction with a loading mechanism that pulls out the magnetic tape T until it comes into contact with the head 7. When the auto loading is completed, the arm 10 is attached to the supply reel 1 side by the elastic force of a spring (not shown). As a result, the roller 13 at the tip of the arm 10 comes into contact with the magnetic tape T wound around the supply reel 1.

Here, the abutment point of the roller 13 with the magnetic tape T is the axis of the arm 10 so as to be located on the downstream side of the winding point P of the magnetic tape T rewound from the take-up reel 3 to the supply reel 1. Set the support position and length.

A rotation angle sensor 14 is attached to the shaft 11 on the back surface of the base plate 12. As described above, by providing the rotation angle sensor 14 on the shaft 11 of the arm 10, the amount of the magnetic tape T wound around the supply reel 1 can be detected, and therefore, the end (EOT) of the magnetic tape T can be detected. End of tape) position can be calculated. The reliability can be improved by knowing the end of the magnetic tape T.

That is, in the case of a magnetic tape, the more data that is taken into the cache memory, the shorter the stop time, so high-speed processing is possible, but the end of the magnetic tape is detected when a large amount of data is stored in the cache memory. Then, the data in the cache memory is left unwritten, and in the worst case, the data may be lost. To prevent this, it is conceivable to store almost no data in the cache memory about 3 m before the end of the magnetic tape, but in order to perform such control, it is necessary to know the end of the magnetic tape accurately. This can be achieved by providing a rotation angle sensor and detecting the angle of the arm when the auto loading is completed.

In the embodiment, the arm 10 is interlocked with the automatic loading mechanism, and the roller 13 at the tip of the arm 10 contacts the magnetic tape T of the supply reel 1 as needed. You may make it always contact | abut with a supply reel, without interlocking with a mechanism.

[0015]

As described above, according to the present invention, the arm urged to the supply reel side is provided in the open reel type magnetic tape drive, and the roller is rotated at the tip of this arm. Since the roller is freely supported and is brought into contact with the position on the downstream side of the winding point of the magnetic tape to be rewound on the supply reel, air is not entrained even when rewinding at high speed, and irregular winding occurs. To be prevented.

Further, by providing the arm with the rotation angle sensor, the amount of the magnetic tape wound around the supply reel can be known. Therefore, the end of the magnetic tape is calculated and the data stored in the cache memory near this end is reduced. Such control is possible, and there is no disadvantage such as loss of data.

[Brief description of drawings]

FIG. 1 is a diagram showing an internal structure of a magnetic tape drive device according to the present invention.

FIG. 2 is an enlarged perspective view of an arm.

FIG. 3 is a diagram for explaining irregular winding of a magnetic tape.

[Explanation of symbols]

1 ... Supply reel, 3 ... Take-up reel, 10 ...
Arm, 11 ... Shaft, 12 ... Base plate, 13 ... Roller, 14 ... Rotation angle sensor, P ... Magnetic tape winding point,
T ... magnetic tape.

Claims (2)

[Scope of utility model registration request] 1. An open-reel type magnetic tape driving device in which a magnetic tape wound around a supply reel is unwound and wound around a take-up reel. The magnetic tape driving device is urged toward the supply reel. A magnetic tape drive characterized in that an arm is provided, and a roller for pressing the magnetic tape is rotatably supported at the tip of the arm at a position downstream of the winding point of the magnetic tape to be rewound on the supply reel. apparatus. 2. The magnetic tape drive according to claim 1, wherein a rotation angle sensor for detecting the amount of the magnetic tape wound around the supply reel is provided at the base end portion of the arm. apparatus.