Abstract: In a disk carrying device including a first idle gear rotatably supported by a lower chassis and a second idle gear for contacting and separating from the first idle gear to perform a rotation operation, the second idle gear and a roller gear meshing therewith are rotatably supported by a feed plate to cause the second idle gear to contact and separate, from below, from the first idle gear rotatably supported by the lower chassis. Because of this configuration, in disk insertion, a downward force F1 acts on the second idle gear and a pushing pressure of the feed roller to a disk D decreases. In disk ejection, an upward force F2 acts on the second idle gear and the pushing pressure of the feed roller to the disk D increases.

Abstract: A disk carrying device and an optical disk recording/reproducing device. The disk carrying device comprises a first idle gear rotatably supported on a lower chassis and a second idle gear rotatingly operated by coming into contact with or separating from the first idle gear. The second idle gear and a roller gear meshed with the second idle gear are rotatably supported on a feed plate, and the second idle gear is brought into contact with or separated from the first idle gear, from the underside, which is rotatably supported on the lower chassis. By this, when a disk is inserted, a downward force F1 acts on the second idle gear, and the pressing force of a feed roller on the disk (D) is decreased and, therefore, the rotating load of a disk carrying motor can be reduced when the carrying of the disk is completed.

Abstract: Herein disclosed is an optical disc driving apparatus adapted to selectively drive two kinds of optical discs different in diameter from each other to reproduce information recorded in the optical disc while reading out information in the optical disc.

Abstract: A paper feeder for use in image forming apparatus is provided, which includes separating rubber member and sheet feeding roller both disposed at a location corresponding to a widthwise central portion of a recording sheet, and which is operative to feed the recording sheet by rotation of the sheet feeding roller and bring the leading edge of the recording into contact with a skew correction roller in a rotation-halted state to correct possible skew of the recording sheet before image formation, the paper feeder being provided with buckling preventive mechanism extending over opposite sides of the separating rubber member for preventing the recording sheet from being deflected during feeding of the recording sheet by the sheet feeding roller.

Abstract: Herein disclosed is an optical disc driving apparatus adapted to selectively drive two kinds of optical discs different in diameter from each other to reproduce information recorded in the optical disc while reading out information in the optical disc.

Abstract: A disc reproducing device has a lock pin for positioning a small-diameter disc inserted into the device in a reproducing position by being loaded by a spring with a force that rotates it about a horizontal shaft, a lock plate for locking the lock pin in a protruding state in the normal state, and a disc detecting lever, locked by being pressed by the outer periphery of a large-diameter disc inserted, for moving the lock plate horizontally with its front end so as to lock and unlock the lock pin. The lock pin in its unlocked state is rotated by being pressed by the large-diameter disc, and, after the largest dimensioned portion of the large-diameter disc passes over the disc detecting lever, the lock plate returns to its original position to lock the lock pin in its falling-down state. With this construction, either an 8-cm-diameter disc or a 12-cm-diameter disc can be reproduced simply by inserting the disc into the device without using an adopter dedicated to an 8-cm-diameter disc.

Abstract: For reducing the number of components used and thereby attaining the reduction of cost and size while ensuring the same disk detecting performance as in the prior art, both light emitting function and light receiving function inherent in an optical pickup are utilized to constitute a disk detecting switch. Only the light emitting function of the optical pickup may be combined with a light receiving element, or only the light receiving function of the optical pickup may be combined with a light emitting element, to constitute a disk detecting switch.

Abstract: A disc reproducing device has a lock pin for positioning a small-diameter disc inserted into the device in a reproducing position by being loaded by a spring with a force that rotates it about a horizontal shaft, a lock plate for locking the lock pin in a protruding state in the normal state, and a disc detecting lever, locked by being pressed by the outer periphery of a large-diameter disc inserted, for moving the lock plate horizontally with its front end so as to lock and unlock the lock pin. The lock pin in its unlocked state is rotated by being pressed by the large-diameter disc, and, after the largest dimensioned portion of the large-diameter disc passes over the disc detecting lever, the lock plate returns to its original position to lock the lock pin in its falling-down state. With this construction, either an 8-cm-diameter disc or a 12-cm-diameter disc can be reproduced simply by inserting the disc into the device without using an adopter dedicated to an 8-cm-diameter disc.

Abstract: For reducing the number of components used and thereby attaining the reduction of cost and size while ensuring the same disk detecting performance as in the prior art, both light emitting function and light receiving function inherent in an optical pickup are utilized to constitute a disk detecting switch. Only the light emitting function of the optical pickup may be combined with a light receiving element, or only the light receiving function of the optical pickup may be combined with a light emitting element, to constitute a disk detecting switch.

Abstract: A method of forming integrally an axis on a metallic plate at an arbitrary position thereof and perpendicular to a surface thereof. A first surface of the metallic plate is place on a first die having a first diameter opening and a second surface of the metallic plate, opposing the first surface, is pressed with a first punch to form a projection from the first surface via half blanking or forward squeezing. The projection has a tip surface extending into the first diameter opening a first distance from the first surface. The first surface of the metallic plate is then placed on a second die having a depression with the projection extending into the depression. The depression has a second diameter and a depth distance greater than the first distance. The second surface of the metallic plate is then contacted with a second punch causing the tip surface of the projection to contact a bottom surface of the depression and form the axial projection via rear-squeezing.

Abstract: A flywheel device for use in a magnetic recording/reproducing unit or the like which device is simple in construction, and can be produced at low costs, and a method of making it. A capstan shaft is press-fitted in a hole formed in a central portion of a metal disk, and then a resin is filled on an outer peripheral portion and a central portion of the disk by outsert molding to form an outer peripheral resin portion and a central resin portion. The outer peripheral resin portion has a groove formed in an outer periphery thereof, and the central resin portion has gear portions.