JP2005310217A - Cassette library system and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely house a tape cassette in a garage, even if accuracy of a stop position of a picker travelling in a direction parallel to the direction of the garage arrangement is not so high in a tape library system. <P>SOLUTION: The tape library system is provided with; a picker 9 which moves to a first horizontal direction getting closer to a garage 8a which can house a cassette 1; a mobile object 15 which can feed the cassette 1 from the picker 9 to the garage 8a by holding the cassette 1 and moving it to a second horizontal direction crossing the first horizontal direction within the picker 9; and a rotation driving means 28 which can rotate the cassette 1 around an axial center of vertical direction with mobile object 15 in the picker 9. When the cassette 1 is sent to the garage 8a while being misaligned, the cassette 1 performs rotation displacement by reaction force received by hitting the garage 8a, and the misalignment is corrected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cassette library apparatus and an operation method thereof, and more particularly to a cassette library apparatus and an operation method thereof in which a cassette such as a tape cassette held by a picker having a turntable structure is sent to a garage and accommodated.

  As a cassette library apparatus of this type, as shown in FIG. 6, a plurality of garages 4 are arranged in a ring shape on a turntable 2 and a tape cassette 1 is accommodated in each garage 4. . Then, the turntable 2 is rotated by the drive mechanism 3 so that the garage 4 containing the target cassette 1 faces the elevator mechanism 5, and the elevator mechanism 5 takes out the target tape cassette 1 from the garage 4. Thus, the information is read and written by being taken in and out of the tape drive 6 (Non-patent Document 1).

  In this configuration, it is possible to automate loading and unloading of the tape cassette into and from the tape drive 6 within the range of the data library stored in the turntable 2. However, when a large number of tape cassettes 1 that are housed in a limited space as a tape library are required, it is said that the magazine system shown in FIG. 7 is more suitable than such a turntable system.

  As shown in FIG. 7, this magazine-type cassette library apparatus has a casing 7 in which a tape drive 6 and a pair of magazine-type garages 8a and 8b are arranged. In each garage 8a, 8b, a plurality of tape cassettes 1 are accommodated in a line. And the picker 9 arrange | positioned between a pair of garages 8a and 8b is comprised so that the tape cassette 1 may be delivered between these garages 8a and 8b and the tape drive 6. FIG.

  8 and 9 show the configuration of an example of the tape cassette 1. The tape cassette 1 is formed in a thin rectangular parallelepiped shape as shown in the figure, and concave portions 10a and 10b are formed on both side portions on the bottom side. 11 is the bottom surface of the tape cassette 1, and 12a and 12b are side surfaces thereof. As shown in FIG. 7, the tape cassette 1 is accommodated in the garages 8a and 8b so that the recesses 10a and 10b are located on the opening side of the garages 8a and 8b, that is, closer to the picker 9.

  As shown in FIGS. 7 and 10, the picker 9 includes a moving body 15 that can move in the horizontal direction. Further, the moving body 15 has a pair of swing arms 16a and 16b as shown in FIGS. 7 to 10, and these swing arms 16a and 16b can swing in the vertical direction. Each of the swing arms 16 a and 16 b includes a horizontal main body portion 17 and a leading end rising portion 18 that rises upward from the leading end of the main body portion 17.

  As shown in FIG. 10, when the moving body 15 of the picker 9 approaches the tape cassette 1 accommodated in the garages 8a and 8b, the swing arms 16a and 16b swing upward, as shown in the figure. The main body portion 17 contacts the bottom surface 11 of the tape cassette 1 and the leading edge rising portion 18 enters the recesses 10a and 10b, whereby the tape cassette 1 is chucked by the swing arms 16a and 16b. In this state, the tape 15 can be pulled out of the garages 8a and 8b by moving the moving body 15 away from the garages 8a and 8b.

As shown in FIGS. 7 and 10, the picker 9 has a guide rail 19, and the drawn tape cassette 1 is placed on the guide rail 19. Thereby, the delivery of the tape cassette 1 from the garages 8a and 8b to the picker 9 is completed.
“New technology of 2002 Matsushita Electric” 2003/05 pp.155-159 “DDS backup library” Matsushita Electric Industrial R & D Planning Office

  When the tape cassette 1 is accommodated in the garages 8a and 8b, for example, the picker 9 taken out of the tape drive 6 and chucked by the swing arms 16a and 16b of the moving body 15 is accommodated in the garages 8a and 8b. The vehicle travels in a direction parallel to the direction in which the garages 8a and 8b are arranged toward the planned position. When the picker 9 reaches the accommodation planned position, the picker 9 is stopped, and then the moving body 15 is moved in a direction approaching the garages 8a and 8b, that is, a direction orthogonal to the traveling direction of the picker 9. Then, the tape cassette 1 is accommodated in the garages 8a and 8b, and then the swing arms 16a and 16b are swung to release the chuck of the tape cassette 1. Then, the moving body 15 is returned to the original position apart from the garages 8a and 8b.

  At this time, in order to securely store the tape cassette 1 in the garages 8a and 8b, the picker 9 running in a direction parallel to the arrangement of the garages 8a and 8b must be stopped with high accuracy corresponding to the storage position. Don't be. That is, the picker 9 is required to stop with high positional accuracy. If the required stopping accuracy is not ensured, there is a technical problem that the tape cassette 1 may be inserted into the garages 8a and 8b at an angle or may not be inserted.

  Therefore, the present invention solves such a problem, and in the tape library apparatus, the tape cassette can be reliably removed from the picker even if the stop position of the picker running in the direction parallel to the direction of the garage is not so high. It aims to be able to be accommodated in a garage.

  In order to achieve this object, a cassette library apparatus according to the present invention includes a garage that can accommodate cassettes, a first horizontally moving picker that approaches the garage, and provided in the picker to hold the cassette. And a movable body capable of feeding the cassette from the picker to the garage by moving in the second horizontal direction intersecting the first horizontal direction in the picker, and the cassette in the picker together with the movable body Rotational drive means capable of rotating around an axis in the vertical direction, the rotational drive means trying to be fed into the garage in a state where the cassette is misaligned with respect to the garage. In this case, when the cassette hits the garage and receives a reaction force from the garage, the reaction force rotates. By receiving position, are those correctable configure the misalignment.

  With such a configuration, since the accuracy of the picker stop position is not so high, even if the cassette is about to be fed into the garage in a state of being misaligned with respect to the garage, The cassette can be securely stored in the garage.

  The cassette library device according to the present invention includes the first brake function for preventing the movement of the picker, the second brake function for preventing the movement of the moving body, and the rotation of the cassette and the moving body by the rotation driving means. The third brake function is configured to act, and the third brake function is configured to act weaker than the first and second brake functions. The cassette and the moving body can be rotationally displaced against the third brake function in a state where the movement of the picker and the moving body is blocked by the brake function.

  With such a configuration, when the cassette hits the garage and receives a reaction force from the garage, only the rotational displacement of the cassette and the moving body occurs without causing the picker or the moving body to move due to the reaction force. Thus, misalignment can be reliably corrected.

  In the cassette library apparatus of the present invention, in the above, the garage has a pair of side walls for forming a space for accommodating the cassette, and an opening for feeding the cassette into the space. It has an inclined surface that serves as a guide when inserting the cassette into the space by being formed in an open shape at the position of the opening, and corrects misalignment by rotational displacement based on the reaction force caused by the cassette hitting this inclined surface It is designed to be possible.

  With such a configuration, since the cassette hits an inclined surface that serves as a guide when the cassette is inserted into the space, the misalignment can be corrected by rotational displacement based on the reaction force. The center misalignment can be corrected while maintaining the guiding state by the inclined surface when inserted into the head.

  The operation method of the cassette library apparatus according to the present invention is such that the picker that moves in the first horizontal direction is stopped at a position corresponding to the garage that can accommodate the cassette, and the movable body that is provided in the picker and holds the cassette Is moved in the second horizontal direction intersecting the first horizontal direction in the picker, the cassette is moved in the direction of feeding into the garage, and the cassette is misaligned with respect to the garage. When the cassette hits the garage and receives a reaction force from the garage, the picker can rotate the cassette together with the moving body around the vertical axis. A possible rotational drive means corrects the misalignment by receiving rotational displacement by the reaction force.

  In this case, since the accuracy of the picker stop position is not so high, the cassette is surely removed from the picker even when the cassette is about to be fed into the garage in a state of being misaligned with respect to the garage. Can be housed in a garage.

  The cassette library device operating method of the present invention includes the first brake function for blocking the picker movement, the second brake function for blocking the movement of the moving body, the cassette and the movement by the rotation driving means. Picking and moving by the first and second brake functions by the third brake function acting weaker than the first and second brake functions among the third brake functions for preventing the body from rotating The cassette and the moving body are rotationally displaced against the third brake function in a state where the movement of the body is blocked.

  In this way, when the cassette hits the garage and receives a reaction force from this garage, only the rotational displacement of the cassette and the moving body is caused without causing the picker or the moving body to move by this reaction force, Misalignment can be reliably corrected.

  In the above-described method for operating the cassette library apparatus of the present invention, in the above description, the cassette is arranged in the opening of the space for accommodating the cassette in the garage so that the cassette is separated from the pair of side walls for forming the space. An inclined surface is provided as a guide when inserted into the cassette, and the misalignment is corrected by rotational displacement based on a reaction force caused by a cassette hitting the inclined surface.

  In this case, the cassette is inserted into the space because the cassette can be corrected by the rotational displacement based on the reaction force when the cassette hits the inclined surface that serves as a guide when the cassette is inserted into the space. The misalignment can be corrected while maintaining the guiding state by the inclined surface.

  According to the present invention, in the cassette library apparatus, since the accuracy of the picker stop position is not so high, even when the cassette is about to be fed into the garage in a state of being misaligned with respect to the garage. The cassette can be reliably stored in the garage from the picker.

  FIG. 2 is a plan view of the cassette library apparatus according to the embodiment of the present invention, and FIG. 1 is an enlarged detail view of the main part in FIG. This cassette library apparatus is of the same magazine type as the conventional cassette library apparatus shown in FIG. 7, wherein 7 is a casing, 8a and 8b are garages, 1 is a tape cassette, 9 is a picker, and 6 is It is a tape drive. The tape cassette 1 is accommodated in the garages 8a and 8b in such a posture that the recesses 10a and 10b are located on the opening side of the garages 8a and 8b, that is, in a place close to the picker 9.

  As shown in FIGS. 1 and 2, the picker 9 is configured to be able to travel in a direction parallel to the direction in which the garages 8a and 8b are arranged in the space between one garage 8a and the other garage 8b. Yes. That is, a guide rail 21 in a direction parallel to the direction in which the garages 8a and 8b are arranged is provided in a portion of the base 20 between the garages 8a and 8b, and a horizontal plate-like frame 22 in the picker 9 is provided. The guide rail 21 is configured to be able to travel. Reference numeral 23 denotes a traveling wheel provided on the frame 22. A rack 24 parallel to the guide rail 21 is provided on the base 20. The frame 22 is provided with a pinion 25 that meshes with the rack 24, and the pinion 25 receives a rotational force from a stepping motor 26 as a drive source provided in the frame 22 via a worm gear mechanism 27. It is configured. Thereby, the picker 9 can be self-propelled while being guided by the guide rail 21. The worm gear mechanism 27 also functions as a brake when the picker 9 is stopped based on the detent structure.

  A large-diameter horizontal plate-like gear 28 is provided on the frame 22 to constitute a turntable. As for the gear 28, the meshing tooth is formed over the substantially half-circle part of the board | plate material. Reference numeral 29 denotes a stepping motor as a drive source for rotationally driving the gear 28, which is linked to the gear 28 via a reduction gear mechanism 30. The reduction gear mechanism 30 is configured to have a correspondingly large gear ratio in order to slowly rotate the gear 28 constituting the turntable. Further, the reduction gear mechanism 30 is constituted by, for example, a spur gear so that the rotation can be permitted when a rotational force is applied to the gear 28 as a turntable from the outside.

  That is, the equipment is housed in a box-shaped casing 7 as shown in FIG. 2, the picker 9 moves in a direction parallel to the long side of the casing 7, and the moving body 15 moves in the direction of the short side of the casing 7. In the cassette library device configured as described above, the movement direction of the picker 9 and the movement direction of the moving body 15 are easily affected by disturbance vibration. For this reason, with respect to the moving direction of the picker 9 and the moving direction of the moving body 15, it is necessary to increase the braking force by using the worm gear mechanism 27 as described above to resist the influence of disturbance vibration. It is. However, the rotation direction of the gear 28 as a turntable is not easily affected by disturbance vibration, and therefore the braking force may be small. Therefore, as described above, there is no problem even if the rotation can be allowed when a rotational force is applied to the gear 28 from the outside.

  On the gear 28, a pair of guide rails 19, 19, a guide rail 31 and a rack 32 formed lower than the guide rails 19, 19 between the guide rails 19, 19, and the guide rails 19, 19 Lifting prevention guides 33 configured to be hooked to the upper edge portion of the tape cassette 1 supported by the above and preventing the tape cassette 1 from floating are provided in the same direction, that is, in parallel.

  The movable body 15 provided with the swing arms 16a and 16b is movable along the guide rail 31. When the guide rail 31 becomes a direction perpendicular to the guide rail 21 by the rotation of the gear 28, the garage 8a, It is possible to approach or move away from 8b. For this purpose, the moving body 15 is provided with a pinion 34 that meshes with the rack 32 and a stepping motor 36 as a drive source for rotating the pinion 34 at a predetermined speed via the reduction gear mechanism 35. .

  As shown in FIG. 1, the accommodating portions of the tape cassettes 1 in the garages 8 a and 8 b include a bottom plate (not shown), a pair of side plates 38 and 38, a back plate 39, and a top plate (not shown). In addition, a horizontal rectangular parallelepiped space 41 having an opening 40 is formed. The tape cassette 1 is accommodated in the garages 8a and 8b with the front end surface of the tape cassette 1 being in contact with the back plate 39. The side plates 38 and 38 are formed with inclined surfaces 42 and 42, respectively, that serve as guides when the tape cassette 1 is inserted into the garages 8a and 8b by being formed to open outwardly at the position of the opening 40.

  In such a configuration, when the tape cassette 1 held by the picker 9 is accommodated in the garages 8a and 8b, the picker 9 is caused to travel along the guide rails 21 so as to be accommodated. , 8b, and the brake is applied by the worm gear mechanism 2 7. At this time, as described above, the stop position may not be strictly accurate. However, when the stop position is accurately stopped, the garage 8a is caused by running the moving body 15 along the guide rail 31. , 8b. Then, the tape cassette 1 chucked by the swing arms 16 a and 16 b is pushed into the predetermined space 41 in the garages 8 a and 8 b from the opening 40 while sliding on the guide rail 19.

At this time, when the picker 9 is stopped in a state of being strictly positioned with respect to the garages 8a and 8b, the tape cassette 1 is pushed into the space 41 without any trouble.
A picker is provided between the concave portions 10a and 10b of the tape cassette 1 and the leading end rising portions 18 and 18 of the swing arms 16a and 16b when the moving body 15 is directed to run toward the garages 8a and 8b. There is some play in the 9 driving directions. Therefore, when the picker 9 is stopped with a slight positional deviation within the range of play with respect to the garages 8a and 8b, the tape cassette 1 is moved closer to the garages 8a and 8b by the moving body 15. When the tape cassette 1 touches the inclined surface 42 of the side plate 38 of the garage 8a, 8b, the tape cassette 1 is guided by the inclined surface 38 and within the above range of play, the garages 8a, 8b. The space 41 is centered, and the centered state is pushed into the space 41 and accommodated.

  As shown in FIG. 3, when the picker 9 stops in a state where the brake is applied, a slight misalignment 43 has occurred between the picker 9 and the garage 8 a, that is, the misalignment 43 causes the recess 10 a of the tape cassette 1 When the size exceeds the range of play between 10b and the tip rising portions 18, 18 of the swing arms 16a, 16b, the following behavior is performed. That is, in this case, when the tape cassette 1 is approached to the garages 8a and 8b by the movable body 15, the tip corners of the tape cassette 1 hit the inclined surface 42 of the side plate 38 of the garages 8a and 8b as shown. Then, a reaction force acts on the tape cassette 1 from the side plates 38 of the garages 8a and 8b, and the reaction force acts on the tape cassette 1 and the movable body 15, and the tape cassette 1 and the movable body 15 and the turntable that supports them. And the gear 28 overcomes the above-described loose braking force generated by the stepping motor 29 and the reduction gear mechanism 30, and moves the tape cassette 1, the movable body 15, and the gear 28 in the rotational direction.

  As a result, the tape cassette 1 is inclined toward the center of the space 30 of the garages 8a and 8b as shown by phantom lines in FIG. 3, and the recesses 10a and 10b of the tape cassette 1 and the swing arms 16a and 16b are The space is pushed into and accommodated in the space 41 using play between the leading edge rising portions 18 and 18 and a gap between the side plates 38 and 38 of the garages 8a and 8b and the tape cassette 1.

  Thus, since the accuracy of the stop position of the picker 9 is not so high, even if there is a slight misalignment 43 between the garages 8a and 8b when the picker 9 stops, the tape cassette The tape cassette 1 can be reliably accommodated in the space 41 without any problem by giving a rotational displacement so as to be directed toward the center of the space 41.

  As shown in FIG. 4, the picker 9 is braked and stopped while being accurately positioned with respect to the garages 8a and 8b, but the tape cassette 1, the moving body 15, and the gear 28 are in an oblique posture. When this happens, the following behavior is performed. That is, also in this case, when the tape cassette 1 is approached to the garages 8a and 8b by the moving body 15, the tip corners of the tape cassette 1 are inclined surfaces 42 of the side plates 38 of the garages 8a and 8b as indicated by phantom lines. It hits. Then, a reaction force acts on the tape cassette 1 from the side plates 38 of the garages 8a and 8b, and the reaction force acts on the tape cassette 1 and the movable body 15, and the tape cassette 1 and the movable body 15 and the turntable that supports them. And the gear 28 overcomes the above-described loose braking force generated by the stepping motor 29 and the reduction gear mechanism 30, and moves the tape cassette 1, the movable body 15, and the gear 28 in the rotational direction.

  As a result, the tape cassette 1 is corrected to the correct posture from the above-described oblique posture toward the center of the space 30 of the garages 8a and 8b, and is pushed straight into the space 41 and accommodated.

  Thus, even when the tape cassette 1 is in an oblique posture when the picker 9 is stopped, the tape cassette 1 is rotated and displaced so that the tape cassette 1 is in a straight posture. 1 can be accommodated in the space 41 without any problem.

  FIG. 5 is a diagram showing a control flow for performing the operations shown in FIG. 3 and FIG. Although not shown in the drawings, it is configured to detect whether or not the rotation angle of the gear 28, that is, the moving body 15 is within an appropriate range by an appropriate first sensor such as a first photo interrupter. It is assumed that the tape cassette 1 can be detected whether or not the tape cassette 1 can be completely inserted into the garage by an appropriate second sensor such as a second photo interrupter.

  In FIG. 5, when the cassette insertion process into the garage is started in step S501, the output of the above-described photo interrupter for confirming the rotation angle of the gear 28 and the like is confirmed in step S502. In step S503, it is determined whether or not the rotation angle is within the proper range. If the rotation angle is within the proper range, the process proceeds to the next step S508. If it is not within the proper range, it is recognized as a rotation error in step S504 and positioning described later is performed. First, in step S505, it is determined whether or not the positioning has already been performed a predetermined number of times. If the predetermined number of times is not reached, in step S506, positioning is performed by adjusting the position of the picker 9 and the rotation angle of the gear 28 so that the rotation angle is within an appropriate range. Then, the process returns to step S502 to retry the output check of the photo interrupter. In this case, if the rotation angle is not yet within the proper range, it is similarly recognized as a rotation error in step S504, and positioning is performed again. This operation is repeated. At this time, if it is recognized in S505 that the error has not been solved after retrying a predetermined number of times, the process proceeds to step S507 and an error display is performed.

  If it is determined in step S503 that the rotation angle is within the appropriate range, the tape cassette 1 is inserted into the garage by moving the moving body 15 in step S508.

  At this time, in step S509, the output of the photo interrupter for insertion confirmation is confirmed. In step S510, it is determined whether or not the tape cassette 1 has been completely inserted into the garage. If it is completely inserted, the process proceeds to the next step S515 to complete the process. If it is not completely inserted, it is recognized as a forward error of the moving body 15 in step S511. Then, as in the case of the rotation angle, it is determined in step S512 whether or not the positioning has been performed a predetermined number of times. If not, in step S513, the moving body 15, that is, the tape cassette 1 is processed in step S508. Positioning is performed by adjusting the position of the picker 9 and the rotation angle of the gear 28 so that the tape cassette 1 can be completely inserted into the garage. After performing this positioning, the process returns to step S502. If the rotation angle is within the proper range in step S503, the process proceeds to step S508, where the cassette is reinserted by the moving body 15, and then in step S509, the photo interrupter is detected. Retry output check.

  In this case as well, positioning is repeated until the tape cassette 1 can be completely inserted. If it is determined in step S512 that the error has not been resolved after retrying a predetermined number of times, this time, the step is performed. The process proceeds to S514 to display an error.

  The cassette library apparatus of the present invention and the operation method thereof are cases where the cassette is sent into the garage in a state where the cassette is misaligned with respect to the garage because the accuracy of the picker stop position is not so high. However, the cassette library device and its operating method, etc., which can securely store the cassette from the picker in the garage, and send the cassette such as a tape cassette held in the picker of the turntable structure to the garage. Useful as.

FIG. 3 is an enlarged detailed view of a main part of the cassette library device according to the embodiment of the present invention. Overall plan view of the cassette library device The figure which shows an example of operation | movement of the cassette library apparatus The figure which shows the other example of operation | movement of the cassette library apparatus The figure which shows the control flow of operation | movement of the cassette library apparatus Schematic diagram of a conventional cassette library device Schematic diagram of another conventional cassette library device Schematic diagram of the tape cassette in the apparatus of FIG. The perspective view of the principal part of the tape cassette of FIG. The figure which shows a mode that the tape cassette of FIG. 7 and FIG. 8 is pulled out with a picker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tape cassette 8a, 8b Garage 9 Picker 15 Moving body 26 Stepping motor 27 Worm gear mechanism 28 Gear 29 Stepping motor 30 Reduction gear mechanism 35 Reduction gear mechanism 36 Stepping motor 42 Inclined surface

Claims (6)

A garage that can accommodate cassettes;
A first horizontally moving picker approaching the garage;
A movable body that is provided in the picker and holds the cassette and can move the cassette from the picker to the garage by moving in the second horizontal direction intersecting the first horizontal direction in the picker. When,
A rotation driving means capable of rotating the cassette together with a moving body around an axis in the vertical direction in the picker;
When the cassette is about to be fed into the garage in a state where the cassette is misaligned with respect to the garage, when the cassette hits the garage and receives a reaction force from the garage, A cassette library device configured to be capable of correcting the misalignment by receiving rotational displacement by force.   The first brake function for preventing the movement of the picker, the second brake function for preventing the movement of the moving body, and the third brake function for blocking the rotation of the cassette and the moving body by the rotation driving means are operated. And the third brake function is weaker than the first and second brake functions, and the first and second brake functions prevent the picker and the moving body from moving. 2. The cassette library apparatus according to claim 1, wherein the cassette and the moving body can be rotationally displaced against the third brake function in the state.   The garage has a pair of side walls for forming a space for accommodating the cassette and an opening for feeding the cassette into the space, and the side wall is formed in an outwardly open shape at the position of the opening. 3. A cassette according to claim 1 or 2, wherein said cassette has an inclined surface that serves as a guide when said cassette is inserted into a space, and is capable of correcting misalignment by rotational displacement based on a reaction force caused by a cassette hitting the inclined surface. Library device. Stop the picker moving in the first horizontal direction at a position corresponding to the garage capable of accommodating the cassette;
Moving the movable body provided in the picker to hold the cassette in the second horizontal direction intersecting the first horizontal direction in the picker, and moving the cassette in the direction of feeding into the garage;
When the cassette is about to be fed into the garage with a misalignment with respect to the garage, when the cassette hits the garage and receives a reaction force from the garage, the cassette moves in the picker An operation method of a cassette library apparatus, wherein a rotational driving means capable of rotating about a vertical axis together with a body receives rotational displacement by the reaction force to correct the misalignment.   Of the first brake function for blocking the movement of the picker, the second brake function for blocking the movement of the moving body, and the third brake function for blocking the rotation of the cassette and the moving body by the rotation driving means, The third brake function acts weakly compared to the first and second brake functions, so that the movement of the picker and the moving body is blocked by the first and second brake functions. The cassette library apparatus operating method according to claim 4, wherein the cassette and the moving body are rotationally displaced.   In the opening of the space that accommodates the cassette in the garage, there is provided an inclined surface that serves as a guide when the cassette is inserted into the space by being formed outwardly on the pair of side walls for forming the space. 6. The method of operating a cassette library apparatus according to claim 4 or 5, wherein the misalignment is corrected by rotational displacement based on a reaction force caused by the cassette hitting the surface.

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