A method and apparatus for stacking newspapers is disclosed which obviates the need to fasten individual stacks. Once ejected from a stacking device, stacks of newspapers pass through an assembly station where they are arranged into groups of three, called slugs, and compressed. The slug then enters a collector where a layer consisting of four slugs is positioned on a sliding table. This positioning requires lateral movement of slugs. Lateral support is provided throughout this movement to prevent the stacks from toppling over. Once a full layer has been accumulated, the sliding table is retracted, and the layer of newspapers falls onto a floating table below. This floating table, which serves as the bottom floor of the container in which it is housed, is automatically lowered by discrete amounts as layers are received. Extendible cylinders located below the collector vertically move the floating table. Since the four walls of the container provide the requisite lateral support, layers of unfastened stacks are able to be securely deposited on the floating table. Once the full container is removed from the collector, a fork lift raises the floating table by inserting its prongs into a gap created between the floating table and the open bottom of the container. In another aspect of the invention, bottom copy damage associated with lateral movement of newspapers is reduced by positioning the stacks so that the nose of the bottom group of newspapers in each stack points in the ultimate direction of lateral movement.
A web tension control and apparatus uses a lightweight dancer and a control system that detects web tension using the dancer position as well as downstream sensors to maintain a relatively constant web tension. The control system also adjusts the braking force to an unwind roll based on the diameter of the roll, allowing for greater web tension control. A two-phase braking system prevents the unwind roll from spilling excess paper into the production line.
In some embodiments, a system for automated loading of a side-by-side stack of thin objects to a feeder is provided. The system can include, e.g.: a) a transporter having a transport surface upon which a side-by-side stack of thin objects can be conveyed; b) a carrier, configured to carry a side-by-side stack of thin objects, over the transport surface; c) a pusher over the transport surface; d) the pusher and the carrier being movable relative to one another between a first position in which the pusher is inside the carrier behind a side-by-side stack of thin objects on the carrier and a second position in which the pusher is laterally displaced from the carrier, such that the side-by-side stack of thin objects on the carrier is laterally slid off of the carrier by the pusher.
A mail destacker is provided that includes a destacker plate and a retractable protrusion that can move between an article erecting position and a retracted position.
