Adaptive closed loop operation of paper transport decision gate
Publication Date: 2005-Oct-03
The IP.com Prior Art Database
Multiple marking engines can be combined to create a single high productivity printing system. The media path for the system consists of a series of high speed 'highway' transports and a series of 'buffer' transports linking each marking engine to and from the highway(s).
Multiple marking engines can be combined to create a single high productivity printing system. The media path for the system consists of a series of high speed ‘highway’ transports and a series of ‘buffer’ transports linking each marking engine to and from the highway(s).
Sheets travel at high speed on the highways, since these transports are shared by multiple marking engines and thus need elevated speed to maintain system productivity. Sheets are routed off of the highways into buffers by decision gates. It is important that the operation of these decision gates be predictable and reliable, since this architecture puts unprecedented demands on this otherwise conventional media path element. Abnormal decision gate response time can result in highway jams that bring most or all of the system down. This invention describes enhancements that can be made to conventional decision gate technology to improve its robustness for this configuration. It provides a media path decision gate with improved predictability and consistency. The enhancements are made by adding sensors to assist in encoding the gate’s operation. Specifically:
- A sensor is placed upstream of the gate within the media path a sufficient distance to serve as a triggering input for the gate control logic. Additionally, the gate control logic is provided the nominal sheet speed so as to determine the estimated time of arri...