| 摘要 |
The pitch of the sprocket is adjusted by radially moving the sprocket teeth outwardly by the corresponding number of cams on a relatively rotatable adjustment plate. The adjustment plate is rotated relative to the adaptor plate that carries the teeth by two alternative apparatus: an annular array of evenly spaced holes on one plate or disc are progressively increasingly offset with respect to an annular array of holes on the other so that a conical pin pushed through two partially aligned holes will relatively rotate the two discs; or grease may be applied through a standard grease nipple to a piston-cylinder assembly inserted within overlapping slots of the two discs. The teeth, after adjustment, may be tightly clamped peripherally and radially by means of one or more wedges between at least two adjacent teeth, which wedges are clamped axially to move radially inward and peripherally wedge against the teeth.
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