Abstract: A compound ball bearing comprises a bearing assembly including a spindle 1, a sleeve 2 surrounding the spindle 1, and an inner ring 6 fitted on the spindle or an outer ring fitted in the sleeve, and balls 5, 9 provided between the spindle 1 and sleeve 2, between the spindle and outer ring or between the inner ring 6 and sleeve 2. A hub 11 serving as the rotor of a motor is formed as a one-piece unit with the spindle. The vibration accuracy of the spindle 1 can be improved.

Abstract: The drive unit is improved in precision while the number of its manufacturing steps is a minimum. The drive unit reduces its manufacturing cost, and comprises a base plate 1 assuming a predetermined shape in cross-section so as to form a pair of frame portions 2 in its opposite sides. The plate 1 is made of metal, formed by using an extrusion process, and provided with: a concave portion 4 with a central hole 3a through which a motor M is mounted on the plate 1; and, a mounting hole 3c through which a swing arm is mounted on the plate 1. The motor M has its spindle 5 mounted in the central hole 3a of the plate 1 in an insertion manner. The swing arm 6 has its base portion supported by a pivot 8 through a pair of ball bearings 7. The pivot 8 is mounted on the plate 1 through the mounting hole 3c in an insertion manner.

Abstract: An integral bearing type electric motor is disclosed, which comprises a bearing body including a spindle, a sleeve surrounding the spindle, an inner or outer ring fitted in or on the spindle, and balls provided between the spindle and sleeve, between the spindle and outer ring or between the inner ring and sleeve. A hub for the rotor of the motor, a flange for the base of the motor or a stator yoke holder is formed by molding together with the sleeve, spindle or inner ring of the bearing body. The number of components is reduced, the number of assembling steps can be reduced, and reduction of the cost of manufacture can be expected.

Abstract: In the motor: rotating shaft 5 is mounted in casing 1; a rotor yoke 7 has its top closed with plate 7a and its bottom opened; the plate 7a with a center hole is fitted on the shaft 5; the rotor yoke 7 has a permanent magnet 6 in its inner surface; stator 8 constructed of coil 11 and stator yoke 12, 13 and fixed to the casing 1 surrounds the shaft 5; bobbin 10 for the coil 11 having its upper and lower ends opened has outer flange 14, 15 in its opposite opened-ends; the stator yoke 12, 13 surround the coil 10; the bobbin 10 has axial ridge 16a in its inner surface; through-holes 17a, 17b, 18a, 18b of the ridge 6a extend along the length of the ridge 16a; feeding members 20, 22 pass through the through-hole 17a, 17b, 18a, 18b, are connected with lead wires 21 extending outward from the coils 10, and have their ends extended outward from the casing 1 to form feeding terminals.

Abstract: A bearing assembly, and method of assembling same, including a stepped-diameter shaft, a first outer race ring being disposed around a raceway groove directly formed in the large diameter portion, a second bearing outer race and an inner race ring mounted on the small diameter portion of the shaft, and a sleeve-like spacer provided with a pair of small diameter portions in its opposite axial end portions each fitted into in the respective first and second outer races.

Abstract: In the manufacture of a casing base for a hard disc drive device, an elongate semi-product of a light metal having a predetermined sectional profile having opposite side frame portions, is extrusion molded and then cut to a predetermined length to obtain an eventual casing base, which is then formed with necessary holes and recessed or raised portions using a press, thus completing the casing base. Like the case of die casting, no cavities are generated, so that it is possible to readily carry out washing and surface treatment. In addition, unlike the case of forming frames in a sole press process, a large number of press forming steps are not involved, and it is possible to permit mass production of a highly accurate and highly rigid product in a small number of steps and at a low cost of manufacture.

Abstract: A compound ball bearing comprises a bearing body including a spindle 1, a sleeve 2 surrounding the spindle 1, and an inner ring fitted on the spindle or an outer ring fitted in the sleeve, and balls 5, 9 provided between the spindle 1 and sleeve 2, between the spindle and outer ring or between the inner ring 6 and sleeve 2. A motor component such as a hub 11 for the rotor, a flange for the motor base or a yoke yolder is molded as a one-piece molding with the sleeve, spindle or inner ring. The inner or outer ring can be secured in a proper position by facilitating its pre-loading, and the vibration accuracy of the spindle can be improved.

Abstract: A double-row ball bearing comprises an axle (1) and a sleeve (2). In such ball bearing: a pre-load is axially applied to one of a short straight tube type inner ring (6) which is mounted on the axle (1) and a short straight tube type outer ring (10) which is mounted in a sleeve (2); and the inner ring (6) is fixed to the axle (1) or the outer ring (10) is fixed to the sleeve (2), in a condition in which the pre-load is applied.

Abstract: In a motor having a spindle (5) on which an inner race (8) of a ball bearing is mounted, an outer peripheral surface of an end of the spindle (5) has a knurled portion (16) on which is mounted the inner race (8) which is fixed to the spindle (5) through an adhesive (18) filled in a clearance between an inner surface of the inner race (8) and the knurled portion (16). An annular groove (19), formed in the spindle (5) in an area adjacent to the knurled portion (16), is also filled with the adhesive (18) to further fix the inner race (8) to the spindle (5), which improves the adhesive bond between the inner race (8) and the spindle (5). Even when the ball bearing is a miniature one having a thin-wall inner race (8), there is no fear of deformation of the inner race (8) when the adhesive (18) is cured, which improves the rotational accuracy of the rotor.

Abstract: In an outer-rotor type spindle motor: a front-end portion of a spindle (4) forming a stationary member passes through a central portion of a hub plate (7c) (onto which a disk (11) is loaded) of a rotor yoke (6) forming a rotating member; and, the front-end portion having been passed through the central portion of the hub plate (7a) of the rotor yoke (6) forms a head portion (4c) which is formed into a semispherical shape having been obliquely cut.

Abstract: In the type-wheel resetting mechanism for the downsized printer: a resetting cam portion (13) is provided in a drive gear (12) to save the number of components and to eliminate assembly and adjusting operations of the cam portion (13) and the drive gear (12); detected portions (25, 25a) for type selection and motor stop operations are provided separately from the drive gear (12); and, a sensor (26) for detecting the detected portions (25, 25a) is provided in the vicinity of the drive gear (12) to save the number of components, which simplifies the construction of the type-wheel resetting mechanism and improves the type-wheel resetting mechanism in reliability.

Abstract: In an outer-rotor type spindle motor: a front-end portion of a spindle (4) forming a stationary member passes through a central portion of a hub plate (7c) (onto which a disk (11) is loaded) of a rotor yoke (6) forming a rotating member; and, the front-end portion having been passed through the central portion of the hub plate (7a) of the rotor yoke (6) forms a head portion (4c) which is formed into a semispherical shape having been obliquely cut.

Abstract: In a ball bearing, a shielding plate (5), which is injection-molded into one piece from a polyacetal resin which is adequate in all of rigidity, Flexibility and resiliency, is interposed between an inner race (1) and an outer race (2) in a side off the bearing to protect the interior of the bearing from dust and moisture. In assembling, the shielding plate ( 5 ) has its outer peripheral portion resiliently deformed and fitted into an inner annular groove (2a) of the outer race (2), and does not affect the outer race (2) in dimension thereof at all after completion of the assembling.

Abstract: A small-sized stepping motor provided with can-type stator yokes and one flat-type stator yoke, all of which are injection molded of a composite powder (i.e., a mixture of a metal powder of a soft magnetic material, a powder of a thermoplastic synthetic resin). The injection molded stator yokes have a considerably large specific electrical resistance, and the stepping motor is free from various disadvantages resulting from a small specific electric resistance.

Abstract: A plug-type sealing assembly for hermetically closing a filler hole 24 of a lid 19 of a container 20, comprises: a plug 1 having a rod portion 3 in an upper part of which a large-diameter head portion 2 is formed, the rod portion 3 having a male screw 5 in its outer peripheral surface; and, a sleeve 8 provided with an axial through-hole together with a countersunk head portion 10 and a slit skirt portion 11 extending downward from a lower end of said countersunk head portion 10. In the through-hole, a female screw 15a, 15b is formed.

Abstract: In an outer rotor motor (1): a hub base (3) is in a center of an upper side of the motor (1); a chucking magnet (16) for carrying a disk is near the hub base (3); a spindle (4) is fixed to a central hole of a rotor yoke which is provided with a permanent magnet (15) in its outer peripheral portion; the spindle (4) is supported by a bearing (5) fixed to a boss (7b) of a bearing housing (7) in which a ring-like rib (7c) is concentrically formed around the boss (7b) to form a circumferential groove (7d) therebetween and a hub of a stator (8) is mounted on the rib (7c); a leaf spring (12) is over the groove (7d) of the bearing housing placed under the base (3); and a drive pin (10) is fixed to a free end of the spring (12) to extend upward from the base (3) due to its resiliency through a hole of the hub base (3).

Abstract: Described is a bearing including an annular inner raceway formed directly on the outer periphery of a rotary shaft, a plurality of bearing balls held between the inner raceway and an outer raceway formed on the outer periphery of an outer ring, a retainer for retaining the balls in position and a tubular housing securely fitted to the outer ring. The bearing may be designed as the double row type by providing a pair of outer rings each having an inner raceway and a pair of outer raceways formed on the rotary shaft. The inner ring may be dispensed with so that the bearing may be simplified in design and improved in load withstand properties.