| 摘要 |
The invention relates to a device for correcting the levels at which book blocks, emerging from a rounding and backing machine, are transferred to a machine downline, the level corrections being referred to a level predetermined by the latter machine, this level correction device possessing a pair of correcting grippers that grip the book block by means of jaws which can be caused to swing by being driven from a cam mechanism via link motion and lever assemblies that enable the throw of the jaw-swinging movement to be varied by adjusting the slidable link of the link motion within its slot guide. In a device of this type, an arrangement is provided whereby the vertical position of the spine of a book block can be sensed by means of a measuring apparatus (12) which is aligned to a defined level, and the resulting measurement is utilized for controlling a drive (11) that adjusts the slidable link, within its link motion slot guide, in the sense of adjusting the throw of the swinging movement executed by the correcting-gripper jaws (10), use being made of a slidable link (4) that is adjustable within an arc-shaped slot guide (4a).
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