JPH0710225A - Library device - Google Patents

Abstract

PURPOSE:To correct the position of a cartridge by means of the inertia even when it has been incompletely contained and stabilize the operation of a library device, by rapidly decelerating a container at least once by the time when a specified row of shelves reaches the front face of a cartridge conveyor. CONSTITUTION:When a cartridge 4 in a container 1 is housed therein or taken out, the container 1 is rotated by a rotational drive controller 6 in the direction in which a specified row of shelves approaches the position of a cartridge conveyor 3. The specified row of shelves is forced to stop at a specified position after it has been decelerated at least once by the time when it reaches the front face of the cartridge conveyer 3. In this way, even if the cartridge 4 has been incompletely contained in the shelf of the container 1, the cartridge is shifted within the shelf due to the inertia of the rapid deceleration and corrected in its normal position. Accordingly, cases that a cartridge can not be taken out because it has been incompletely contained are reduced and hence, stable operation of the device can be continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention takes out a cartridge containing a recording medium such as a magnetic tape from a shelf of a cylindrical storage which rotates / stops, transports it, mounts it in a medium driving device, and reads data. The present invention relates to a library apparatus which stores cartridges again on the shelves of the hangar, and more particularly to a library apparatus which can rapidly reduce the rotation of the hangar at least once until it stops at the take-out / storage position.

Recently, a cartridge containing a magnetic recording medium such as a magnetic tape, on which data is recorded, is stored in a storage box provided with shelves by dividing a cylindrical outer circumference into a plurality of rows and a plurality of stages, and a cartridge carrying device is used. A library apparatus has been developed and put into practical use, in which a cartridge is taken out of a shelf of a storage box, transported, inserted into a recording medium driving device, and read data of a recording medium.

In such a device, a groove on the bottom surface of the cartridge inserted into the hangar is provided in the shelf when the rotation stop position of the hangar is not accurate or the insertion stop position of the carrying tray of the cartridge carrying device is displaced. If the cartridge is not stored properly without being engaged with the positioning claws and the position is shifted to the left or right or is slanted, the cartridge cannot be grasped in the carrying tray of the cartridge carrying device the next time it is taken out, which hinders the operation of the device. Therefore, there is a demand for a method capable of correcting an incorrectly inserted cartridge to a normal position.

[0004]

2. Description of the Related Art FIG. 7 shows an outline of a library device. In FIGS. 7A and 7B, 1a is a hangar, 2a to 2d are magnetic tape devices, 3a is a conveying device, 4a is a cartridge, 10a, 10b,
─ is a shelf, 30 is a guide shaft, 31 is a lifting arm, and 32 is a transport tray.

As shown in FIGS. 7 (a) and 7 (b), the hangar 1a
Has a plurality of shelves 10a, 10b, which have a cylindrical outer periphery divided into a plurality of rows and a plurality of stages, in which a cartridge 4a containing a magnetic tape is stored, and a shaft (100) serves as a center for driving a motor (not shown). Rotate. At this time, one of the columns of the shelves 10a, 10b, -specified by the storage or take-out command is controlled so as to rotate in a direction close to the transport device 3a.

The magnetic tape devices 2a to 2d are equipped with mounting parts 20a to 20d.
The magnetic tapes of the cartridges 4a mounted in the respective d's are driven to read the information recorded on the magnetic tapes. Figure 8
As shown in (a) and (c), the carrier device 3a includes a guide shaft 3 provided in front of the hangar 1a and the magnetic tape devices 2a to 2d.
0, a lifting arm 31, a transport tray 32, and a lifting mechanism 33, and a transport tray 32 held at the tip of the lifting arm 31.
Is rotated in the horizontal direction by a motor (not shown), and the tips thereof are arranged so as to approach the shelves 10a, 10b of the storage 1a and the front surfaces of the mounting portions 20a-20d of the magnetic tape devices 2a-2d.

The elevating mechanism 33 is a mechanism for elevating the elevating arm 31 slidably fitted to the guide shaft 30.
A belt 35 to which a weight 34 and a weight 34 are attached is hung on pulleys P1 and P2 provided at the upper and lower ends of the guide shaft 30. Then, the elevating arm 31 is moved up and down by driving a motor (not shown) connected to the pulley P1.

The carrier tray 32 is provided with a hand mechanism (not shown). When the leading end of the carrier tray 32 faces the front of the hangar 1a or the magnetic tape devices 2a to 2d, the carrier arm 32 moves up and down to move the hand mechanism. The cartridge 4a is gripped and mounted on the transport tray 32 by driving the cartridge 4a, and the cartridge 4a is transported to a designated position to transfer the cartridge 4a to the shelves 10a, 10a.
Stored in any one of b, -or mounted on the mounting portions 20a to 20d.

With such a structure, the transport tray 32 is rotated in the direction of the hangar 1a and then the hangar 1a is designated by a command from the control unit based on a cartridge transport command from a host device (not shown). Any one of the shelves 10a, 10b, ─ is rotated in a direction close to the transport tray 32 and stopped, and the elevating mechanism 33 elevates and lowers the elevating arm 31 so that one of the shelves 10a, 10b, ─ at the designated stage. Carry tray 32
To remove the cartridge 4a.

The transport tray 32 is connected to the magnetic tape devices 2a ...
2d, the elevating arm 31 is moved up and down again to be transported to any of the designated magnetic tape devices 2a to 2d, and the mounting section
Attach to 20a-20d.

Thus, when the tape is driven and the use of the magnetic tape is completed, the cartridge 4a is removed from any of the mounting portions 20a to 20d corresponding to the instruction from the control portion, and the cartridge 4a is conveyed by the operation opposite to the above. Store in designated shelves 10a, 10b.

Here, the cartridge 4a is replaced by the shelves 10a, 10
The state stored in b, ─ is described below with reference to Figs. 8 (a) and 8 (b).
As shown in, the engaging groove 40 is formed on both sides of the bottom surface of the cartridge 4a.
a, 40b are provided, and the shelves 10a, 10b, ─ are provided with positioning claws 11a, 11b.
When the cartridge 4a is in the normal position when the cartridge 4a is inserted into the a, 10b, and is slightly lowered and stored, the engaging groove 40 is inserted.
The a and 40b are engaged with the claws 11a and 11b and positioned.

[0013]

According to the above-mentioned conventional method, the control of the rotation of the hangar is only stopped after the row of shelves designated by the storage or take-out command rotates in the direction close to the transfer device. It was

Therefore, when the accuracy of the rotation stop position of the hangar is poor, the insertion stop position of the transport tray of the cartridge transporting device is displaced, or the cartridge is lifted by vibration due to an earthquake or the like, the operator must be informed in advance. If the storage is incomplete when you store the cartridge by hand, the cartridge may be displaced to the right or left (right in the figure) as shown in Fig. 9 (a) due to the following reasons: One of the engaging grooves and the positioning claw provided on the shelf may be engaged with each other, but the other may not be engaged, or, as shown in FIG. 9 (b), the cartridge is stored at an angle so that the engaging groove is not formed. Even if the cartridge is incompletely stored on the shelf of the hangar, it will not be corrected even if it is in a raised position without engaging with the claws, and it will be left as it is. Take out The, can not be mounted on the conveyance tray because it can not grasp of the hand mechanism, there is a problem that the operation of the device will be hindered apparatus operation is stopped.

It is an object of the present invention to provide a library device which can correct the incomplete storage of the cartridges on the shelves of the hangar and can perform stable operation.

[0016]

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 4 is a cartridge containing a recording medium, 10 is a shelf provided in the storage case 1, 1 is formed in a cylindrical shape that rotates about its center, and the cylindrical outer periphery is divided into a plurality of rows and a plurality of stages. A storage case 2 having a plurality of formed shelves 10 and storing a cartridge 4 accommodating a recording medium in the shelf 10 is provided outside the storage case 1 and is a medium driving means for driving the recording medium of the inserted cartridge 4. 3 is a cartridge carrying means for vertically moving and changing direction to carry and insert the cartridge 4 between the hangar 1 and the medium driving means 2, and 6 is a designated shelf when the cartridge 4 of the hangar 1 is stored or taken out. Row of cartridge carriers 3
The rotation drive control means rotates the storage body 1 in a direction close to the position, rapidly decelerates at least once until the designated shelf row comes to the front surface of the cartridge carrying means 3, and then stops at the designated position. .

[0017]

When the cartridge 4 of the hangar 1 is stored or taken out, the rotation drive control means 6 moves the designated shelf row in the direction close to the position of the cartridge carrying means 3.
Is rotated, and the specified row of shelves is rapidly decelerated at least once until it comes to the front of the cartridge carrier 3,
By stopping at the specified position, even if the cartridge 4 is incompletely stored on the shelf 10 of the hangar 1, the cartridge 4 stored by the inertia due to the rapid deceleration of the rotation of the hangar 1 moves inside the shelf 10. It is corrected to the normal position.

Therefore, it is possible to prevent the cartridge 4 from being taken out due to incomplete storage, and to continue stable operation of the apparatus.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (corresponding to claim 1 and claim 2) in which the present invention is applied to the library device described in the conventional example will be described below with reference to FIGS. 2 and 3 are configuration diagrams showing an embodiment of the present invention, FIG. 4 is a speed conversion diagram of the embodiment, FIG. 5 is a configuration diagram showing a transport tray and a hand drive mechanism, and FIG. 6 is a flowchart of the embodiment. The same reference numerals denote the same objects throughout the drawings.

The magnetic tape devices 2a to 2d and the conveying device 3a in FIG. 2 correspond to the medium driving means 2 and the cartridge conveying means 3 in FIG. 1, respectively, and the ROM 51 and the hangar rotation drive control device 6a in FIG. Corresponds to the rotation drive control means 6 in FIG.

In the block diagram of FIG. 2, 5 is a control unit,
6a is a rotation drive device, 7 is a lifting drive device, 8 is a horizontal rotation drive device, 9 is a hand drive device, and 12 is a counter. The control unit 5 includes a CPU 50, a ROM 51, and a RAM 52,
A control program stored in the ROM 51 by the CPU 50,
And a counter for executing the RAM52 control program
Control each part based on 12 information.

The ROM 51 controls the hangar rotation drive device 6a, the elevating drive device 7, the transport tray rotation drive device 8 and the hand drive device 9 to store / store the hangar 1a in the cartridge 4a.
By the take-out command, the designated shelves 10a, 10b,
One of the rows of — rotates in the direction close to the transport device 3a, causes the counter 12 to count the rotation of the hangar 1a in the same direction, and rotates in the opposite direction at a rate of once every predetermined number of times. As shown in (b), the rotation speed is suddenly reduced immediately before the specified position regardless of the rotation direction and then stopped, and the transport tray 32 is vertically moved and horizontally rotated to remove the cartridge 4a from the shelves 10a, 10b ,. Take-out, transport and mounting parts 20a-20d
Position control program for mounting the cartridge 4a on the shelf 10a to 10d, removing the cartridge 4a from the mounting portions 20a to 20d and storing it on the shelves 10a and 10b, and the rotation position of the storage 1a and the sensors S and S1 and S2, which will be described later. The detected shelves 10 from the combination of detection signals
A program for determining the address of a, 10b, or the like, moving the transport tray 32 to that position, and storing / reloading the cartridge 4a, and a drive control program for the magnetic tape devices 2a to 2d. And are stored.

The RAM 52 is provided with a counter 12, a rotation direction file 13, and a rotation degree setting unit 14. The counter 12 is the number of times that the storage 1a is continuously rotated in the same direction when the storage 1a is rotated by the storage rotation drive device 6a. To count.
That is, for example, clockwise is defined as + for forward rotation, and counterclockwise is defined as-for reverse rotation, and is stored in the rotation direction file 13 and counted, and when the rotation direction is changed, the count up to that time is cleared, Count 1 in opposite direction
And Then, when the count reaches the rotation frequency set in the rotation frequency setting unit 14, a count-out signal is transmitted.

The hangar rotation drive device 6a is composed of a drive circuit 36, a drive motor M1, and a rotation transmission mechanism 37, and the shelves 10a, 10b, ...
The storage 1a is rotated in a direction closer to the transfer device 3a from any of the above.

The transfer device 3a is composed of a lift drive device 7, a transfer tray rotation drive device 8 and a hand drive device 9. The lifting drive device 7 includes a drive circuit 38, a drive motor M2,
And a lifting mechanism 33, which drives the drive motor M2 to move the lifting arm 31 fitted to the guide shaft 30 up and down by the movement of the belt 35.

The transport tray rotation drive device 8 includes a drive circuit 3
9, the drive motor M3, and the transport tray 32, as shown in FIG.
As shown in (a) and (b), the drive motor M3 drives the motor.
G1 and G2 rotate to rotate the transport tray 32 by an angle between the front surface of the hangar 1a and the front surfaces of the magnetic tape devices 2a to 2d.

The hand drive device 9 includes a drive circuit 41 and a motor.
It is composed of the M4 and the hand mechanism 42 on the carrying tray 32.
As shown in (a) and (b), the hand mechanism 42 includes a tongue piece portion 43.
And finger pushers 44a and 44b. The tongue piece portion 43 is projected forward as shown by a chain double-dashed line in the figure by a drive mechanism including a motor M5, a rack and a pinion (not shown). The finger pushers 44a and 44b are attached to the rear portion of the tongue piece portion 43 and move together, and the left and right tips are opened and closed by the drive mechanism by the motor M4 and the gear group (not shown).

When the cartridge 4a is stored, the shelves 10a, 10b, and the bottoms of the shelves 10a, 10b, and
A gap larger than the thickness of the tongue piece portion 43 of the transport tray 32 is formed between the bottom surfaces of the 4a.

Therefore, when the carrying tray 32 is carried to the designated shelves 10a, 10b, or any one of the mounting portions 20a to 20d and the cartridge 4a is taken out, the tongue piece portion 43 is advanced to move the cartridge 4a. The cartridge 4a is inserted into the gap below and is slightly lifted, then the cartridge 4a is sandwiched by the finger pushers 44a and 44b from the left and right, and the tongue piece portion 43 is retracted, so that the cartridge 4a is mounted on the transport tray 32.

The mounted cartridge 4a is transported to the front of any of the designated mounting portions 20a to 20d or the shelves 10a, 10b, and is stored or mounted by the procedure opposite to the above example. For example, when the cartridge 4a is taken out of the shelves 10a, 10b, the tips of the finger pushers 44a, 44b are opened by driving the motor M4, and the tongue 43 and the finger pushers 44a, 44b are moved forward by driving the motor M5.

Then, the tongue piece portion 43 is inserted into the gap on the lower surface of the cartridge 4a, the motor M4 is driven in the opposite direction to hold the cartridge 4a by the finger pushers 44a and 44b, and the transport tray 32 is moved slightly upward. , Claws 11a on the bottom of shelves 10a, 10b,
When the engaging grooves 40a, 40b of the cartridge 4a are removed from 11b and the tongue piece 43 is returned to the original position by the reverse driving of the motor M5, the cartridge 4a is mounted on the transport tray 32.

When the cartridge 4a is stored in the shelves 10a, 10b, the cartridge 4a can be pushed out by the tongue 43 and the finger pushers 44a, 44b by reversing the above procedure. The same applies when the cartridge 4a is removed from the mounting portions 20a to 20d of the magnetic tape devices 2a to 2d and mounted. However, when the cartridge 4a is taken out from the mounting portions 20a to 20d, the mounted cartridge 4a is automatically pushed upward so that the tongue piece portion 43 can be inserted.

As shown in FIG. 3 (a), when the transport tray 32 is positioned in the direction of the storage case 1a, the front surface of the row of the shelves 10a, 10b, of the storage case 1a facing the tip of the transport tray 32 emits light. A sensor S consisting of a light emitting element and a light receiving element is arranged in the vertical direction so as to pass therethrough, and the shelves 10a, 10b, ─ in the horizontal direction are arranged so that the emitted light passes through the front surfaces of the shelves 10a, 10b, ─ at each stage. Sensors S1, S2, of the same number of stages are provided.

Therefore, as shown by the chain double-dashed line in FIG. 3 (b), when the cartridge 4a projects to the front of the shelves 10a, 10b,-, when the storage 1a rotates, the light from the light emitting element is blocked. Is detected. When the address of the shelf 10a, 10b, -is determined by the detection of any one of the sensors S1, S2, -and the sensor S, the rotation stops at the shelf row.

Having such a structure and function, the operation will be described below with reference to the flowchart of FIG. First, when a command is issued to take out the cartridge 4a from the hangar 1a and attach it to any of the magnetic tape devices 2a to 2d,
The transport tray rotation drive device 8 is activated to rotate the transport tray 32 toward the storage 1a.

The control unit 5 activates the hangar rotation drive device 6a, determines the direction in which the designated shelf row is close to the transport tray 32, and checks whether the rotation direction is the same as the rotation direction of the file 13.

When the current rotation direction is different from the counted rotation direction, the counter 12 is cleared and the rotation direction file 13 is updated in the opposite direction.
Counting in different rotation directions is started, and the hangar 1a is rotated in a direction closer to the transport tray 32. Then, the flow is performed.

If the current rotation direction is the same as the counted rotation direction, the counter 12 is counted, and if the count is less than the number of times set in the rotation frequency setting unit 13, for example, less than 10, the hangar 1a is opened. Rotate in the direction close to the transport tray 32. That is, it is the acceleration and constant velocity region of FIG. Then, the flow is performed.

When the count reaches the set number of times, a count-out signal is transmitted to rotate the hangar 1a in the opposite direction, not in the direction close to the transport tray 32. That is, FIG. 4 (b)
Acceleration, constant speed range. Then, the flow is performed.

Immediately before the designated shelf row comes to the front of the transport tray 32, the rotation of the hangar 1a is suddenly decelerated, and the transport tray 32 is stopped.
Stop in front of. That is, the deceleration and stop regions shown in FIG. 4 (a) or (b).

During the rotation of the hangar 1a described above,
Any one of the sensors S1 and S2, and the sensor S is attached to the shelf 10a, 10b,
When it is detected that the cartridge 4a is protruding from the cartridge, the control unit 5 determines the address of the shelf, stops the rotation at the shelf row, and activates the elevating / lowering device 7 to start the transport tray.
32 moves up and down to the position of the corresponding shelf, advances the tongue piece 43 and inserts it into the gap below the cartridge 4a, slightly lifts the transport tray 32, and then opens the finger pusher 44.
Push in the cartridge 4a with a and 44b, sandwich the cartridge 4a and open the tips of the finger pushers 44a and 44b again,
Lower the transport tray 32 to engage the claws 11a, 11b, ─ with the engaging grooves 40a, 40b,
─ is stored and the tongue piece portion 43 is retracted, and the detection release of any one of the sensors S1, S2, ─ and the sensor S is confirmed. Multiple shelves
When the cartridge 4a is protruding by 10a, 10b,-, the pushing operation is repeated. When all the pushing is completed, the rotation of is restarted, and the process is repeated until just before the designated shelf line.

Then, the elevating drive device 7 is activated, and the elevating mechanism 33 elevates and lowers the transport tray 32 to the designated shelf position. The hand drive device 9 is activated to drive the cartridge from one of the shelves 10a, 10b, -designated by the hand mechanism 42.
4a is gripped and taken out, and the transfer tray 32 is attached to the magnetic tape device.
Rotate in the direction of 2a to 2d and specify the specified magnetic tape unit 2a
The cartridge 4a is mounted by moving up and down to the height of the mounting portions 20a to 20d of 2d.

Thus, the cartridges 4a whose magnetic tapes have been used in the magnetic tape devices 2a to 2d are stored in the shelves 10a of the storage 1a.
In the case of storing in 10b,-, the same process is performed in the reverse order of the above flow.

As a different embodiment (corresponding to claim 3), when the storage case 1a is rotated by a take-out command or a storage command of the cartridge 4a, the designated shelf row is located at a position facing the transport tray 32. Immediately before arrival,
As shown in FIG. 4, the operation of suddenly decelerating the rotation speed and then stopping, further rotating in the opposite direction and returning, rotating again in the original direction and suddenly decelerating and stopping as shown in FIG.
This is a method of stopping at a designated position after repeating a predetermined number of times, for example, 2-3 times.

That is, when the rotation speed is rapidly reduced once, the shelves 10a,
10b, -claw 11a, 11b is too far from the cartridge
If the engaging grooves 40a, 40b of 4a could not be engaged, by repeating the process a plurality of times, the engaging grooves can be formed in the claws 11a, 11b.
By engaging the cartridges 40a and 40b, the misaligned cartridge 4a can be normally stored.

In this case, since the return rotation is repeated a plurality of times, the processing time for taking out / storing the cartridge 4a takes a little longer, but the effect of normalizing the stored state of the cartridge 4a is great.

In this way, the rotation of the hangar 1a can be suddenly decelerated to move the cartridge 4a to the normal position by inertia, and the cartridge 4a protruding to the front of the hangar 1a can be used for any of the sensors S1, S2 ,. Since it can be detected by the sensor S and pushed by the transport tray 32, the incomplete storage of the cartridge 4a can be normalized.

When the hangar 1a is continuously rotated in the same direction, the hangar 1a is rotated in the opposite direction at a rate of once every predetermined number of times, or this rapid decrease operation is repeated a predetermined number of times so that the shelves 10a, 10b ,. Even if the inner cartridge 4a is displaced in the opposite direction, or even if the displacement of the cartridge 4a is large, it can be normalized.

In the above embodiment, the case where the rotation of the hangar 1a is suddenly decelerated and stopped when the designated shelf row comes immediately before the stop position has been described. However, the rotation is accelerated during the rotation until the designated shelf row reaches the stop position. Alternatively, a method of repeating constant speed and sudden deceleration multiple times may be used.

In another embodiment, the designated shelf row is rapidly reduced and stopped immediately before the stop position, further returned and rotated, and then similarly rotated in the original direction to rapidly reduce and stop, which is repeated a predetermined number of times. Although the case has been described, a method may be used in which the designated shelf row repeats rotation in the forward and reverse directions, rapid deceleration, and stop immediately before the stop position. Alternatively, immediately before the stop position, rotation, deceleration, and stop are performed, rotation, deceleration, and stop are performed in the same direction from the stop position, and then rotation is performed in the opposite direction.
A method of repeating deceleration and stop, and rotating, decelerating, and stopping in the same direction from the stop position a plurality of times may be considered.

[0051]

As described above, according to the present invention, in claim 1, after the designated rack row is suddenly decelerated at least once until it comes to the front of the cartridge carrying means, it is stopped at the designated position. As a result, even if the cartridge is imperfectly stored on the shelf of the hangar, the stored cartridge is moved within the shelf by the inertia due to the rapid deceleration of the rotation of the hangar and is corrected to the normal position. Therefore, the inability to take out the cartridge due to incomplete storage is reduced, and stable operation of the apparatus can be continued.

According to a second aspect of the present invention, when the hangar is continuously rotated a predetermined number of times in the same direction, the hangar is rotated in the opposite direction at a rate of once every predetermined number of times, and after abruptly decelerating immediately before the designated stop position, it is designated. By stopping at the position, even if the cartridge is displaced in the opposite direction in the shelf, the cartridge can be moved and corrected to the normal position. Therefore, the inability to take out the cartridge due to incomplete storage is further reduced, and stable operation of the apparatus can be continued.

According to the third aspect, by rapidly decelerating immediately before the designated stop position and then stopping at the designated position for a predetermined number of times, it is possible to move the cartridge in the shelf even if the displacement of the cartridge is large. It is corrected to the correct position. Therefore, the inability to take out the cartridge due to incomplete storage is further reduced, and stable operation of the apparatus can be continued. There is an effect.

[Brief description of drawings]

FIG. 1 is a block diagram of the principle of the present invention.

FIG. 2 is a configuration diagram (1) showing an embodiment of the present invention.

FIG. 3 is a configuration diagram (part 2) showing an embodiment of the present invention.

FIG. 4 is a speed conversion diagram of the embodiment.

FIG. 5 is a configuration diagram showing a transport tray.

FIG. 6 is a flowchart of an embodiment.

FIG. 7 is a block diagram showing a library device to which the present invention is applied.

FIG. 8 is an explanatory diagram of cartridge storage.

FIG. 9 is an explanatory diagram showing the problems of the conventional example.

[Explanation of symbols]

1, 1a is a hangar, 2 is a medium driving means, and 2a to 2d
Is a magnetic tape device, 3 is a cartridge carrier,
3a is a transport device, 5 is a control unit, 6
Is a rotation drive control means, 6a is a hangar rotation drive device,
a, 10b are shelves, 12 is a counter, 14 is a rotation frequency setting section, 51 is a ROM, 52 is a RAM

Claims (3)

[Claims] 1. A cartridge for accommodating a recording medium, the cartridge having a plurality of shelves (10) formed in a cylindrical shape that rotates about its center, and the outer circumference of the cylindrical shape being divided into a plurality of rows and a plurality of stages. Storage (1) for storing (4) in the shelf (10), and medium driving means (2) provided outside the storage (1) for driving the recording medium of the inserted cartridge (4) A cartridge carrier (3) for moving and inserting the cartridge (4) between the hangar (1) and the medium driving means (2) by vertically moving and changing direction, and the hangar (1). When the cartridge (4) is stored or taken out, the designated shelving row is rotated in the direction in which the designated shelf row is close to the position of the cartridge transport means (3), and the designated shelf row is moved to the cartridge transport means. (3) A rotation drive control hand that suddenly decelerates at least once before coming to the front and stops at the specified position. (6) and the library apparatus comprising the. 2. The rotation drive control means (6) is arranged such that when the hangar (1) is continuously rotated a predetermined number of times in the same direction, the designated shelves are arranged once in a predetermined number of times. 2. The library device according to claim 1, wherein the library device is rotated in a direction opposite to a direction close to the position of the cartridge carrier (3). 3. The rotation drive control means (6) performs a predetermined number of operations to stop the designated shelf row at the designated position after abrupt deceleration immediately before coming to the front of the cartridge carrying means (3). The library device according to claim 1 or 2, wherein the library device is repeated.