| 摘要 |
A machine for building a stack of stiff flat articles comprises an input device for feed of a horizontal flow of flat articles in an overlapping shingled relationship and travelling in a first direction, a pusher mechanism for engaging with a side of one of the flat articles and for driving a plurality of flat articles into a vertical stack at a first location. The pusher mechanism comprises a carriage device for movement in the first direction, a bottom-pusher mechanism mounted on the carriage and a top-pusher mechanism mounted on the carriage. The machine further comprises a control device for controlling movements of the bottom or top or bottom pusher mechanisms such that, if the horizontal flow of articles is top-stacked, the bottom pusher mechanism engages a side of one of the flat articles and drives a plurality of the flat articles into the vertical stack, and if the horizontal flow of articles is under-stacked, the top-pusher mechanism at least pushes off a plurality of flat articles to for the vertical stack.
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