| 摘要 |
An article conveyor apparatus is disclosed wherein the gripper clamps possess a movable clamping tongue and a fixed clamping tongue which forms part of a housing. The movable clamping tongue is formed of one-piece with a spiral spring. The latter is wound about a hollow shaft rotatably mounted in the housing. The hollow shaft is rigidly connected for rotation with an arm or lever carrying at its end a roller. A part of the hollow shaft is constructed as a blocking wheel of a blocking mechanism. This blocking wheel is provided with a gap into which engages, in the latching position, the one end of a blocking pawl pivotably mounted in the housing. Upon travel of the roller upon a bracket or cam or the like the hollow shaft is rotated in a predetermined direction, whereby the movable clamping tongue is moved towards the other clamping tongue. If both clamping tongues are brought together then during further rotation of the hollow shaft the spiral spring is tensioned. The tensioned spiral spring exerts a closing force upon the movable clamping tongue. Retrorotation of the hollow shaft is prevented by the blocking pawl which has latched into the gap. To open the gripper clamp the blocking pawl of the blocking arrangement is released by depressing upon a part protruding past the housing. The now relaxed spiral spring rotates the hollow shaft in another predetermined direction, so that the movable clamping tongue is raised from the stationary clamping tongue. The spiral spring therefore serves both as a closing spring and also as an opening spring for the clamping tongues and also as a holder spring for the blocking mechanism. |
