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Avoidance Of Jams And Of Damage To Sub-Systems By Measurement Of Media Shape As The Media Passes Through The Set Of Sub-Systems

IP.com Disclosure Number: IPCOM000019561D
Publication Date: 2003-Sep-18
Document File: 3 page(s) / 107K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention discloses that in a media processing system, e.g., a electrophotographic copier or printer, the condition of the media be monitored so that if the media becomes damaged, the media processing system can be halted before the damaged media enters the next stage of the process, thereby minimizing the severity of the jam that would otherwise have to be cleared and possibly avoiding damage to the sub-system that would have encountered the damaged media.

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Avoidance Of Jams And Of Damage To Sub-Systems By Measurement Of Media Shape As The Media Passes Through The Set Of Sub-Systems

Media passing from the input tray through the marking process (charge, expose, transfer, fuse) to the output tray can be damaged at a number of places in the path. If the media is damaged, there will likely be a jam that may be harder to clear due to fact that the media has been damaged before entering the step in the process where the jam actually occurs. Additionally, the damaged media can damage the sub-system in which it induces a jam.

Typically, switches are used to detect whether a piece of media has reached a certain point in the path. If the media has not reached that point at the expected time, a jam is declared and the location(s) of the sheet(s) are displayed for the user to clear. This invention discloses that in a media processing system, e.g., a electrophotographic copier or printer, the condition of the media be monitored so that if the media becomes damaged, the media processing system can be halted before the damaged media enters the next stage of the process, thereby minimizing the severity of the jam that would otherwise have to be cleared and possibly avoiding damage to the sub-system that would have encountered the damaged media.

Large area detector technology can be used for sensors for determining the position of two-dimensional objects. These same sensors can be used to detect not only the location of the media but also if it has retained its shape or has been damaged (corner curl, torn side, etc).

Figure 1 shows an array of large area sensors that has been developed for intelligent position and motion control of media as it passes through an electrophotographic engine. The view shown is looking down onto the sensor from the illuminator. The illuminator produces collimated light that falls on the sensor array. The outline is that of a piece of media between the illuminator and the sensor array. The individual sensors are the circles. The blue sensors are those that are completely blocked by the media whereas the green sensors represent those that are totally exposed. The gray sensors are those that are partially blocked by the media.

           
   
     
     

Blocked by media

 
 
 
     
     

Fully exposed

 
 
 
     
     

Partially blocked

 
 
 
 

Figure 1: top view of array of sensors showing outline of a sheet of media with individual sensors color-coded to indicate those that are blocked by the media, those that are fully exposed and those that are partially exposed.

In the application where registration, including orientation, is detected, the signals from the partially exposed sensors are used to calculate the location of the edges and their orientation. This information is used to drive actuators that re-position and re-orient the media to achieve high quality registration on the output print.

In the application described here, the signals from the partially exposed sens...