Isel Co., Ltd.

Masanori Mochizuki

Kenji Mochizuki

Katsuhiro Tachibana

A needle roller bearing includes a plurality of needle rollers that each have first and second end portions and that are disposed circumferentially around a shaft, a cylindrical first retainer member having a plurality of first notches each respectively adapted to rotatably support the first end portion of a respective one of the rollers, and a cylindrical second retainer member located spaced apart from and opposite the first retainer member and having a plurality of second notches each respectively adapted to rotatably support the second end portion of a respective one of the rollers. A plurality of voids are provided to form grease-containing spaces between the adjacent rollers and between the first and second retainer members so that the roller bearing is sufficiently lubricated.

Roller bearing with a retainer having voids for containing grease

A guide apparatus ( ) slidably supports a shaft member ( ) and a column ( ) relative to each other. The column ( ) has a through hole ( ) formed therein and the shaft member ( ) penetrates the through hole ( ). In the column ( ), there is provided a slide mechanism ( ) formed of a plurality of cylindrical rolling elements ( ) adapted to roll axially on an outer circumference ( ) of the shaft member ( ). The column ( ) is formed of a plurality of split members ( ) that are divided on sectional planes each perpendicular to the axial direction of the column ( ). A plurality of positioning pins ( ) are provided on each contact surface of the adjacent split members ( ). The adjacent split members are centered or positioned relative to one another by the positioning pins ( ).

Positioning device with a solid cylindrical pin

A shutter panel ( ) in which respective longer sides of slats ( ) made of synthetic resin are connected through hinge mechanisms to be freely bendable manner, wherein the hinge mechanisms include one hinge member and another hinge member. Each hinge member has a connecting groove that is opened outwardly. By fitting and coupling the longer sides of the slats into the connecting grooves respectively, smooth opening and closing of the shutter panel ( ) can be performed because of decreasing warpage or irregularities in thickness of slats ( ) or the hinge members and enabling smooth bending of respective slats ( ) connected by the hinge mechanisms.

Shutter panel

A shutter includes a shutter panel having a plurality of plates which are rotatably connected to one another by hinge members and a pair of guide rails formed with guide grooves which slidably hold opposite end edges of the shutter panel By using the hinge members which connect the adjacent plates to each other so that the plates are rotatably bent only in a direction in which a curvature becomes greater than a portion of the guide groove having a minimum curvature, it is possible to smoothly open and close the shutter even when the curvature of the guide rail is varied along the sliding direction of the shutter panel

Shutter

A guide device includes a shaft member and a column. The column has a through hole formed therein and the shaft member penetrates the through hole of the column. A plurality of pockets are formed on an inner circumferential surface of the through hole of the column. The pockets are disposed on a plurality of cross sectional planes that are perpendicular to an axial direction of the column. In each pocket, there are provided an outer race or roller rolling axially on an outer circumferential surface of the shaft member, and a supporting shaft supporting the outer race rotatably. The column is formed of a plurality of splittable members that are divided on cross sectional planes each perpendicular to the axial direction of the column and that pass through a center line of the supporting shaft. The adjacent splittable members are centered by the supporting shaft.

Guide device for relative movement between ram and column formed of splittable members

A shutter has a shutter panel and a pair of guide rails that hold both end portions of the shutter panel slidably. The guide rails have curved portions. Each of the guide rails includes straight members having parallel tie plates and an interval plate connecting central portions of the tie plates resulting in an H-shaped section. Each of the guide rails includes corner members having curved plates succeeding to the tie plates. Both end portions of the shutter panel are inserted slidably between inner half portions of the tie plates partitioned by the interval plates, and outer half portions of the tie plates are mounted to a fixing portion to thereby enable smooth sliding movement of the shutter panel within the guide rails.

This invention provides a bearing retainer for a sliding mechanism for use in a machine tool, especially a press. The bearing retainer has a tubular or generally cylindrical retainer body. The retainer body has a plurality of supporting holes to support rollers. Tongue-like portions are formed at the edge portions of each supporting hole for preventing a roller from falling out of the supporting hole. Cavities are provided between the adjacent supporting holes. Each cavity permits the edge portion including the tongue-like portion to deform elastically in the direction that the aperture of each supporting hole will be enlarged on the outer side surface of the retainer body. Thus, when the outer mold has moved away from the inner mold during the injection molding process of the retainer the retainer can be obtained from a mold set without cracking or breaking the tongue-like portion of the retainer. In this way, the tongue-like portion can be molded on the outer side surface of the retainer by injection molding process. As a result of this, caulking process for forming the tongue-like portion is not required and manufacturing cost can be reduced.

Bearing retainer for a sliding mechanism for use in a machine tool

A planetary reduction gear comprising pairs of partial planetary gears, two partial internal gears and a sun gear or comprising pairs of partial planetary gears, two partial sun gears and an internal gear in which partial planetary gears mesh with partial internal gears or with partial sun gears independently. One of the partial gears is fixed to the input shaft or to the casing. The other partial gear is loosely connected to the input shaft or to the casing by a spiral coupling which allows the partial gear to move in spiral direction. A pressing means pushes the partial gear in the axial direction. Force of the pressing means moves the partial gear in the spiral direction. The partial gear slightly rotates relatively to the other partial gear. Relative rotation of the partial gears cancels backlashes. In the case of helical gears, the spiral coupling can be replaced by an axial coupling. The loosely coupled partial gear can rotate by a cam device comprising tapered keys and axial notches of the partial gears. Axial displacement of the gears themselves or the keys induces relative rotation which cancels transmission error and alleviates noise generation by eliminating backlashes.

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Yao, Japan

Masanori Mochizuki