| 摘要 |
<p>A punching unit in a punching binding machine for joining together packs of sheets by a resilient teeth comb binder, comprises on a framework of the machine: a fixed bar provided with openings having a substantially vertical axis; a plurality of punches, each of which extended through the openings and each comprising a bottom cutting edge and a tang extended at the top of the bar; a movable bar arranged at the top of the fixed bar and carrying a series of catches, each of which movable between an active position for operating the relative punch, and a rest position where such a punch is not thereby operated; the movable bar being supported on slides sliding on the framework; a control assembly for the lowering of the movable bar on the fixed bar. The control assembly comprises: a control shaft rotatably carried on the framework; a plate integral in rotation with the shaft; a connecting rod pivoted at one end to the plate; a lever pivoted at the other end of the connecting rod, and having its fulcrum at a fixed location to the framework and extended beyond the fulcrum to form a head engaged with the slide for movement of the latter.</p> |
