Horizontal state correction circuit of a disk transferring device and method therefor

A method for correcting a horizontal state of a disk transferring device, wherein the disk transferring device is disposed between a left chassis frame extending in a vertical direction and a right chassis frame extending in the vertical direction, the left and right chassis frames each having recessed portions and raised portions constituting grooves, wherein the disk transferring device moves in the vertical direction and a horizontal state of the disk transferring device is corrected by one or more correction motors, the method comprising the steps of:

• outputting a light signal to the grooves of the left and right chassis frames which respectively reflect a pulse according to the light signal which is reflected by the recessed portions and raised portions of the grooves;
• comparing a difference between the pulses reflected from each of said left and right chassis frames and detecting a portion of said pulses having a level different from one another;
• integrating the detected different portions of said pulses to generate an integrated pulse;
• determining a rotation direction of the one or more correction motors while simultaneously performing said integrating step;
• comparing the integrated pulse with a reference voltage pulse;
• determining an amount of rotation of said correction motors based on the compared value;
• and
• driving said correction motors to rotate according to the determined rotation direction and by the amount determined in the step of determining an amount of rotation, thereby correcting the horizontal state of the disk transferring device to be substantially perpendicular to the vertical direction.

An apparatus for correcting a horizontal state of a disk transferring device having a lower frame extending in a horizontal direction between two ends and having left and right frames disposed on the two ends, respectively, the left frame fixedly connected to a first belt which is connected to a left chassis frame extending in a vertical direction between a top end and a bottom end thereof, and the right frame fixedly connected to a second belt which is connected to a right chassis frame extending in the vertical direction between a top end and a bottom end thereof, wherein the disk transferring device moves in the vertical direction such that the lower frame is substantially perpendicular to the left and right chassis frames, the apparatus comprising:

• a correcting motor;
• a detecting circuit for detecting a height of the left and right frames of the disk transferring device;
• a comparing circuit for comparing the detected height of the left and right frames of the disk transferring device and determining an amount of error in the horizontal state of the disk transferring device based on the comparison;
• a controlling circuit for determining a rotation direction of said correction motor according to the error in the horizontal state determined by said comparing circuit;
• and
• a correcting circuit for driving said correction motor in the determined rotation direction by as much as the amount of error determined by said comparing circuit to correct the error in the horizontal state of the disk transferring device.

A method for correcting a horizontal state of a disk transferring device, wherein the disk transferring device is disposed between a left chassis frame extending in a vertical direction and a right chassis frame extending in the vertical direction, the left and right chassis frames each having recessed portions and raised portions constituting grooves, wherein the disk transferring device moves in the vertical direction and the horizontal state of the disk transferring device is corrected by a plurality of correction motors, the method comprising the steps of:

• outputting a light signal to the grooves of the left and right chassis frames which respectively reflect a pulse according to the light signal which is reflected by the recessed portions and raised portions of the grooves;
• comparing a difference between the pulses reflected from each of said left and right chassis frames and detecting a portion of said pulses having a level different from one another;
• integrating the detected different portions of said pulses to generate an integrated pulse;
• determining which of the plurality of correction motors to drive while simultaneously performing said integrating step;
• comparing the integrated pulse with a reference voltage pulse;
• determining an amount of rotation of said correction motors based on the compared value;
• and
• driving said correction motors to rotate according to the determined rotation direction and by the amount determined in the step of determining an amount of rotation, thereby correcting a horizontal state of the disk transferring device to be substantially perpendicular to the vertical direction.