Disk chucking mechanism and disk drive device with increased positional accuracy

A disk chucking mechanism comprising:

• a casing having a spindle motor mounted therein and having a motor shaft;
• a disk table fixed to said motor shaft of the spindle motor for rotation in response to energization of said spindle motor, said disk table having a positioning protrusion centrally thereon;
• a chucking pulley for clamping and chucking a disk-shaped recording medium in coaction with said disk table, said chucking pulley having a positioning tube for receiving said positioning protrusion inserted therein;
• a support arm extending in a direction perpendicular to an axial direction of said chucking pulley, said chucking pulley being rotatably supported on said support arm;
• and
• a moving mechanism configured to move said chucking pulley toward and away from said disk table, said support arm being movably supported by said moving mechanism;
• wherein said support arm has a through hole limit element;
• and
• wherein said casing has a limit member for limiting said limit element and configured to prevent said support arm from moving in a direction perpendicular to the axial direction of said chucking pulley and perpendicular to a longitudinal direction of said support arm.

A disk drive device having a spindle motor having a motor shaft, a disk table fixed to said motor shaft of the spindle motor for rotation in response to energization of said spindle motor, and a chucking pulley for clamping and chucking a disk-shaped recording medium in coaction with said disk table, said chucking pulley having a rotary slide knob projecting away from said disk table, wherein an information signal is recorded on and reproduced from the disk-shaped recording medium which is chucked by said disk table and said chucking pulley, said disk drive device comprising:

• a support arm extending in a direction perpendicular to an axial direction of said chucking pulley, said chucking pulley being rotatably supported on an end of said support arm in a longitudinal direction thereof;
• a first lifting/lowering pin and a second lifting/lowering pin which are mounted on an opposite end portion of said support arm and spaced from each other in said longitudinal direction;
• a holder fixedly mounted on said support arm for pressing said chucking pulley toward said disk table while being held in contact with a distal end of said rotary slide knob when said disk-shaped recording medium is in rotation;
• a bias spring having a portion mounted on said support arm and another portion resiliently held against said first lifting/lowering pin;
• and
• a moving mechanism configured to move said chucking pulley toward and away from said disk table, said first lifting/lowering pin and said second lifting/lowering pin being movably supported by said moving mechanism;
• wherein said moving mechanism has a retainer for retaining said first lifting/lowering pin in an acting position when the disk-shaped recording medium is chucked;
• and
• wherein said first lifting/lowering pin retained in the acting position by said retainer elastically deforms said bias spring to bias said support arm and said holder to move toward said disk table.

A disk drive device having a casing having a spindle motor mounted therein and having a motor shaft, a disk table fixed to said motor shaft of the spindle motor for rotation in response to energization of said spindle motor, said disk table having a positioning protrusion centrally thereon, and a chucking pulley for clamping and chucking a disk-shaped recording medium in coaction with said disk table, said chucking pulley having a positioning tube for receiving said positioning protrusion inserted therein, wherein an information signal is recorded on and reproduced from the disk-shaped recording medium which is chucked by said disk table and said chucking pulley, said disk drive device comprising:

• a support arm extending in a direction perpendicular to an axial direction of said chucking pulley, said chucking pulley being rotatably supported on said support arm;
• and
• a moving mechanism configured to move said chucking pulley toward and away from said disk table, said support arm being movably supported by said moving mechanism;
• wherein said support arm has a through hole limit element;
• and
• wherein said casing has a limit member for limiting said limit element and configured to prevent said support arm from moving in a direction perpendicular to the axial direction of said chucking pulley and perpendicular to a longitudinal direction of said support arm.