Gear drive mechanism and library device
It is possible to reduce influence of backlash effectively and to carry out precise position control even if a drive mechanism uses rotary drive of gears. For this, in moving a subject to be moved by rotation of the gears, an original point for position control is positioned by use of a sensor flag, and afterward the position control is carried out. When positioning, a bias means generates a bias in a moving direction for movement to be moved that backlash of gear drive may be removed. This sets the backlash to substantial “zero” in positioning the original point, and stabilizes an original point reset position.
1. A library device, comprising:
a magazine capable of storing a cartridge;
a drive configured to carry out reading from a recording medium in the cartridge and writing into the recording medium;
an accessor configured to move the cartridge stored in the magazine from or to the drive;
an indicator;
a bias mechanism; and
a gear drive mechanism,
wherein:
the gear drive mechanism is configured to move the accessor along a prescribed driving path by a rotation of a gear,
an original point, for position control, of the accessor is positioned by use of a detection result from a detection mechanism for the indicator, which is arranged at one end of the driving path in a direction of a movement of the original point,
when positioning the original point, the bias mechanism generates a bias in a direction of a movement of the accessor so that backlash of the gear drive mechanism may be removed, synchronously to the detection of the indicator by the detection mechanism,
the bias mechanism is arranged on at least one of:
a portion of the accessor, which faces to the original point in a direction approaching the original point, and
a portion of an inner wall of a chassis at the original point side,
when the accessor is moved, the bias mechanism is pushed and pressed between the accessor and the inner wall of the chassis, and
when the bias mechanism is pushed and pressed, the bias mechanism generates a restoration force according to an elasticity of the accessor and the inner wall of the chassis.
2. A library device, comprising:
a magazine capable of storing a cartridge;
a drive configured to carry out reading from a recording medium in the cartridge and writing into the recording medium;
an accessor configured to move the cartridge stored in the magazine from or to the drive;
a bias mechanism;
a gear;
a gear drive mechanism; and
an original point indicator configured to define an original point of the accessor which is used for controlling a position of the accessor,
a detection mechanism, which is arranged on the accessor, to detect the original point indicator,
wherein:
the gear drive mechanism is configured to move the accessor along a prescribed driving path by a rotation of the gear,
the original point indicator is arranged at one end of the driving path in a direction of a movement of the accessor;
a position of the original point is defined as a position where the detection mechanism detects a prescribed position of the original point indicator, by movement of the accessor;
when the accessor stays in the vicinity of the original point, the bias mechanism generates a restoration force according to elastic deformation in a vicinity of the original point in a direction away from the original point and along the direction of the movement of the accessor, synchronously to the detection of original point indicator by the detection mechanism;
the bias mechanism is arranged on at least one of:
a portion of the accessor, which faces the original point in a direction approaching both the original point, and
a portion of an inner wall of a chassis at the original point side;
when the accessor is moved, the bias mechanism is pushed and pressed between the accessor and the inner wall of the chassis; and
when the bias mechanism is pushed and pressed, the bias mechanism generates a restoration force according to an elasticity of the accessor and the inner wall.