The patent's assignee for patent number 8523034 is
News editors obtained the following quote from the background information supplied by the inventors: "Different problems can be present in the transport of a printing substrate web to an electrographic printing device. For example, problems occur when the printing substrate web is delivered from differently arranged sources, for example from differently arranged printing substrate web stacks or from another printing device or from different types of printing substrate webs (a printing substrate web of a different width, pre-folded). In order to prevent web tears or web loops of the printing substrate web that are too large, storage buffers for the printing substrate web are provided. In a printing device a storage buffer is also required in order to have a sufficient reserve of printing substrate web upon starting and stopping the printing device. In particular, due to the re-proofing calculated for the pages in the retraction required in the printing device (for example in color printing), based on the start ramp-up to reach the printing speed a reserve amount of printing substrate web must be held back in order to avoid a tearing of the printing substrate web.
"It is known (for example WO 98/39691 A1 or U.S. Pat. No. 6,246,856 B1) to solve this problem with the aid of what is known as a dancing roller arranged in a reserve buffer, a roller resting freely directed on the printing substrate web. If a loosening of the printing substrate web (a sagging of the printing substrate web) occurs in operation, this is drawn by the weight of the dancing roller into the reserve buffer and a loop is therefore formed. For example, this can be executed (for example DE 10 2004 002 232.1-51) such that sensors scanning the loop are arranged in the reserve buffer, which sensors output sensor signals indicating the length of the loop that are used to control the transport of the printing substrate web.
"U.S. Pat. No. 6,068,172 A describes an electrographic printing device with a printing substrate transport device. A drive unit (made up of two drive rollers 12, 13) that transport the printing substrate into the printing device are provided outside the printing device. The printing substrate web is supplied in the printing device via a tension spring to a pendulum and from there arrives via deflection rollers at the transfer printing station in which the toner images are transfer-printed onto the printing substrate. After the transfer printing station an additional drive unit is provided that draws the printing substrate from the transfer printing station. The printing substrate conveyed by the drive unit into the printing device is supplied, tensioned by the tension spring, to the pendulum. The drive unit is thereby controlled by the tension of the printing substrate since the wrap angle of the printing substrate around the rollers is changed depending on the tension of the printing substrate. Depending on this angle, the drive motor for the rollers is regulated such that the deflection of the pendulum is between the end positions of the pendulum.
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