Tsubakimoto Chain Company

Toru Okabe

Toshifumi Sato

Yusuke Haga

Nobuaki Haga

In the manufacture of a link plate for a silent chain, a band of sheet steel is intermittently forwarded to string of punching dies and shaving dies. The band tends to follow a slightly curved path, which causes alignment errors in a conventional punching and shaving operation. However, in this case, each shaving die and its corresponding punching die are disposed in symmetrical relationship with respect to an intermediate position along the path of movement of the band, and the intermediate position coincides with the location at which the deviation of the band. As a result, the shaving dies are more accurately aligned with the punched surfaces produced by the corresponding punching dies.

Link plate for silent chain and method of manufacturing same

By press-fitting a cylindrical blank into a die with one of a pair of punches, and at the same time press-fitting small diameter end portions and tapered portions of the pair of punches into both ends of the cylindrical blank while restraining both end surfaces of the blank with cylindrical members movable on the outsides of the punches, the external circumferential surface of the blank is finish molded to the required diameter by the internal circumferential surface of the die and, at the same time, tapered surfaces are formed on the inner circumferential surface in both ends of the blank. The process produces a bushing with its internal surfaces accurately coaxial, and with the external surface accurately formed to the required diameter.

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Osaka, Japan

Toru Okabe