| 摘要 |
An article exchange apparatus which can be used in an auto-loader having an exchange arm, an automatic tool exchange apparatus of a machine tool and the like, comprises an indexing mechanism constructed of a prime mover and a plurality of follower units. The apparatus also includes a mechanism for effecting intermittent indexing operations alternately at the plural follower units in response to a rotational drive of the prime mover. A hydraulic circuit is coupled to the prime mover for imparting such a rotational drive thereto, which is necessary for one cycle of a predetermined operational sequence. The prime mover is coupled to each of the follower units so that, with rotation of the prime mover, one of the units is rotated while the other is held fixed. During one full cycle, each of the follower units executes two indexing motions and has two pause cycles. The apparatus also includes a chuck for gripping an article which is engageable with each of the follower units for rotating the chuck and opening and closing the chuck. A first one of the follower units during the latter half of a first indexing movement thereof, closes the chuck and an arm carring the chuck and also forming part of the apparatus is raised during the first indexing movement of the other follower unit. The arm is rotated by the second indexing movement of the first follower unit. The arm is then lowered by the second indexing term of the other follower unit where upon the chuck is opened during the first half of the first indexing movement of the first follower unit.
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