Tsubakimoto Chain Company

Tsubakimoto Kogyo Co. Ltd.

Tsubakimoto Chainco.

Shunji Sakura

Koichi Saeda

Tatsuya Hirai

Akira Hirai

Masatoshi Sonoda

Kohei Kunimatsu

Yoshikazu Nakano

Ryuta Shoji

Hiroshi Kawanaka

Takashi Makino

Masayuki Tamura

Yuko Sanada

Yuji Kurematsu

Satoshi Ueda

Toshimitsu Sakai

Hiroki Ishida

Kenshi Suzuki

Takayuki Morimoto

Katsunori Sakai

Shiro Inoue

Masahiro Sudare

Naoto Shibata

Tamaki Shiki

Yasuyuki Suyama

Hisakazu Sakamoto

Hiroyuki Mineyama

Kazuhiko Kishimoto

Atsuo Noguchi

Shiroh Inoue

Taku Horie

Hisaharu Terashima

Hiroto Sunaba

An engagement chain includes a pair of first and second chain members that are engaged so as to be integrated with each other by moving in an advancing direction and disengaged from each other so as to bifurcate by moving in a retreating direction from the integrated engaged state. A first link plate of the first chain member includes first and second pin holes through which a coupling pin is inserted. A second link plate of the second chain member includes first and second pin holes through which a coupling pin is inserted. A first distance between the first and second pin holes of the first link plate is shorter than a second distance between the first and second pin holes of the second link plate.

Mating chain and movable body transfer device

An interlocking chain unit includes a stepped rod that determines the positions of case plates in a pair and those of guide plates relative to each other. The stepped rod has a small-diameter part that passes through passage holes of the guide plates respectively. The stepped rod has opposite end portions fitting in countersunk holes respectively formed in respective inner surfaces of the case plates. The stepped rod has a large-diameter part with a guide plate side step abutting on a rim of the passage hole of the guide plate, and a case plate side step abutting on a rim of the countersunk hole of the case plate.

Interlocking chain unit

In a silent chain transmission, the distance between the centers of front and rear pin holes of each of the inner link plates of the chain is smaller than the length of the smallest chord obtained by dividing, by the number of sprocket teeth, the circumference of a circle having a radius extending from the center of the sprocket to the center of a pin hole of a link plate of the chain when the last-mentioned link plate is fully engaged with the sprocket.

Silent chain transmission

In a timing chain drive, a hybrid driving sprocket, having roller-engaging teeth and side sprocket teeth, cooperates with a hybrid chain having rollers that mesh with the roller-engaging teeth and toothed link plates that mesh with the side sprocket teeth. A driven sprocket from which the chain travels toward the driving sprocket has a cyclically varying tooth pitch that compensates for tension variations due to cyclic variations in the rotational speed of the driving sprocket or to cyclic variations in the load applied to the driven sprocket. The driven sprocket can be a roller sprocket or a hybrid sprocket having roller-engaging teeth and side sprocket teeth for engagement with the teeth on the link plates of the chain.

Timing chain driving system

In a chain transmission, the link plates of a roller chain or rollerless bushing chain are formed with pairs of teeth. A sprocket has a central set of sprocket teeth for meshing with the rollers or bushings, and sets of side sprocket teeth for meshing with the teeth of the link plates. The teeth of the link plates function as a silent chain. After an inner flank of a link plate tooth comes into contact with a side sprocket tooth, a roller and an outer flank of the link plate tooth are seated on the sprocket.

Chain transmission device

In a chain transmission using a hybrid chain having inner and outer links with bushings, or with bushings and rollers, the rollers mesh with a central sprocket, and the link plates have teeth that function as a silent chain, meshing with side sprockets fixed to the central sprocket. The teeth of the link plates of the inner links have a shape different from that of the teeth of the link plates of the outer links. The outer flanks of the teeth can all have the same shape, and the shape difference can be in the shapes of the inner flanks.

A sprocket for a chain drive using a roller or bushing chain has a plurality of different pitch angles, including both pitch angles larger than the standard pitch angle, and pitch angles smaller than the standard pitch angle. The number of pitch angles in the sprocket larger than the standard pitch angle is greater than the number of pitch angles in the sprocket smaller than the standard pitch angle. The sprocket teeth are integrally molded with the sprocket by sintering.

Sprocket for chain

In a timing chain driving system in which the speed of a driving sprocket fluctuates cyclically, the tooth pitch of a driven sprocket from which a tension span of the chain travels toward the driving sprocket varies cyclically around the circumference of the driven sprocket so that the tooth pitch at the point at which the timing chain disengages from the driven sprocket is at a minimum when the rotational speed of the driving sprocket is maximum, moderating fluctuations in chain tension. A similar effect can be achieved in the case of a driving sprocket having a cyclically varying tooth pitch by arranging the driving sprocket so that its tooth pitch is maximum at the point at which it is engaged by the chain when its rotational speed is maximum.

Timing chain drive system

In a timing chain drive unit the tooth pitch of a driven sprocket from which a tension span of the chain travels toward a driving sprocket varies cyclically around the circumference of the driven sprocket and cyclically increases and decreases the length of the tension span in synchronism with load variations imparted to the driven sprocket by a valve-operating camshaft.

Timing chain drive unit

In a chain transmission having a sprocket with an elastic ring sandwiched between a central hub and an annular toothed outer member, the tooth form is such that the root diameter, that is, the diameter of the tooth gap bottom circle, is greater than the root diameter in a sprocket having a standard ISO tooth form.

In a chain transmission, vibration reduction is improved by an elastic member, sandwiched between an inner hub of a sprocket and a toothed outer circumferential member, in combination with a sprocket tooth configuration in which two or three different tooth form pitch angles are arranged irregularly along the sprocket's pitch circle.

In a roller or bushing chain transmission a standard roller or bushing chain having a uniform chain pitch meshes with a sprocket having at least two different tooth form pitches.

To provide a compact lifter device, which can attain a work-piece's lifting/lowering operation in a stable supporting state and can reduce the parts number and an assembly load. A lifter devicein which a pair of work-piece lifting chainsrespectively fed movably forward and backward by a pair of regularly/reversely rotatable driving sprocketswhile being sandwiched by the sprockets includes flexing suppression membersdisposed oppositely to each other, and each of these flexing suppression memberscomprises a number of blocksdisposed at mounting intervals of two times the chain pitch P on a drawing side of the work-piece lifting/lowering chainand a lifting/lowering support barof a length corresponding to a chain's upright state, disposed on a feeding side continued to the drawing side of the work-piece lifting/lowering chainso that the flexing suppression membersare engaged with each other to lift or lower a work-piece in a chain's upright state of the fed chain.

Lifter device

An apparatus for preventing urging rotation of a ball screw shaft in a linear working machine includes a housing. A compressive force stopper and a tensile force stopper is contained in an outer casing of the housing. The compressive force stopper and the tensile force stopper are pressed against the compressive force receptive rotation member and the tensile force receptive rotation member respectively. A coil spring is strictly wound around an outer periphery of the compressive force receptive rotation member and the tensile force receptive rotation member. Urging rotation of the ball screw shaft by external force in an axial direction is prevented by the compressive force receptive rotation member, the tensile force receptive rotation member and the coil spring.

Apparatus for preventing urging rotation of a ball screw shaft for a

A safety structure, for use in a work rotating apparatus for a laser beam machine having a manually rotatable shaft and work holder supported by a frame, comprises a pin and a pair of stops. The stops are separately located along a circular arc which is coaxial with the shaft. The stops contact the pin to limit the angle of rotation of the shaft which prevents the rotatable work holder, and the workpiece held by said work holder, from colliding with the frame.

Growing community of inventors

Osaka, Japan

Shunji Sakura