Scanning a media stack

A media source, comprising:

• a tray for holding a media stack, the media stack having opposing faces joined by sides, a pattern being formed on at least one of the sides, each face being a face of a media sheet, the pattern including a plurality of sub-patterns, each sub-pattern being formed on a different subset of sheets in the media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the sub-pattern is formed, the imaging data for at least one subset of sheets identifying an expected number of sheets in that subset;
• a transport mechanism operable to move the tray between a first position in which the media stack can be loaded onto the tray and a second position in which a sheet from the media stack loaded onto the tray can be fed into a print path of an imaging device;
• a sensor positioned so that it can scan the sub-patterns as the transport mechanism moves the tray between the first and second positions;
• and
• control logic operable to communicate with the sensor to decipher the imaging data from the sub-patterns for each subset of sheets in the media stack.

A media source, comprising:

• a tray for holding a media stack, the media stack having opposing faces joined by sides, a pattern being formed on at least one of the sides, each face being a face of a media sheet, the pattern including a plurality of sub-patterns, each sub-pattern being formed on a different subset of sheets in the media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the sub-pattern is formed, the imaging data for at least one subset of sheets identifying an expected number of sheets in that subset;
• means for moving the tray between a first position and a second position;
• means for scanning the sub-patterns as the tray is moved between the first position and the second position;
• and
• a means for deciphering the imaging data from the sub-patterns for each subset of sheets in the media stack.

A data identification system, comprising:

• a tray for holding a media stack, the media stack the media stack having opposing faces joined by sides, a pattern being formed on at least one of the sides, each face being a face of a media sheet, the pattern including a plurality of sub-patterns, each sub-pattern being formed on a different subset of sheets in the media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the sub-pattern is formed, the imaging data for at least one subset of sheets identifying an expected number of sheets in that subset;
• a transport mechanism operable to move the tray between a first position and a second position;
• a sensor positioned to scan the sub-patterns as the transport mechanism moves the tray between the first position and the second position;
• and
• logic coupled to the sensor and operable to decipher the imaging data from the sub-patterns for each subset of sheets in the media stack.

An imaging device, comprising:

• a print engine operable to form an image on a sheet of media;
• a media source operable to supply a media stack, the media source including:
• a tray for holding the media stack, the media stack having opposing faces joined by sides, a pattern being formed on at least one of the sides, each face being a face of a media sheet, the pattern including a plurality of sub-patterns, each sub-pattern being formed on a different subset of sheets in the media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the sub-pattern is formed, the imaging data for at least one subset of sheets identifying an expected number of sheets in that subset;
• a transport mechanism operable to move the tray between a first position and a second position;
• a sensor positioned to scan the sub-patterns as the transport mechanism moves the tray between the first position and the second position;
• a transfer mechanism operable to transfer sheets of media from the media source to the print engine;
• control logic in communication with the media source, the print engine, and the transfer mechanism, the control logic operable to decipher the imaging data from the sub-patterns for each subset of sheets in the media stack and to control the operation of the print engine with respect to each subset of sheets according to the imaging data for that subset of sheets.

An imaging device, comprising:

• a print engine operable to form an image on a sheet of media;
• a first media source operable to supply a first media stack, the first media source including:
• a first tray for holding the first media stack, the first media stack having opposing faces joined by sides, a first pattern being formed on at least one of the sides, each face being a face of a media sheet, the first pattern including a plurality of first sub-patterns, each first sub-pattern being formed on a different subset of sheets in the first media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the first sub-pattern is formed, the imaging data for at least one subset of sheets in the first media stack identifying an expected number of sheets in that subset;
• a first transport mechanism operable to move the first tray between a first position and a second position;
• a first sensor positioned to scan the first sub-patterns as the first transport mechanism moves the first tray between the first position and the second position;
• a second media source operable to supply a second media stack, the second media source including:
• a second tray for holding the second media stack, the second media stack having opposing faces joined by sides, a second pattern being formed on at least one of the sides, each face being a face of a media sheet, the second pattern including a plurality of second sub-patterns, each second sub-pattern being formed on a different subset of sheets in the second media stack and encoding imaging data or a reference associated with the imaging data for the subset of sheets on which the second sub-pattern is formed, the imaging data for at least one subset of sheets in the second media stack identifying an expected number of sheets in that subset;
• a second transport mechanism operable to move the second tray between a third position and a fourth position;
• a second sensor positioned to scan the second sub-patterns as the second transport mechanism moves the second tray between the third position and the fourth position;
• a transfer mechanism operable to transfer sheets of media from the first and second media sources to the print engine;
• control logic in communication with the first and second media sources, the print engine, and the transfer mechanism, the control logic operable to decipher the first and second sub-patterns to identify imaging data for each of the first subsets of sheets in the first media stack and second media data for each of the second subsets of sheets in the second media stack and to control the operation of the transfer mechanism and to control the operation of the print engine so that the first imaging data for a given one of the subsets of sheets in the first media stack is used when a media sheet from that given subset of sheets from the first media stack is transferred from the first media source and the second imaging data for a given one of the subsets of sheets in the second media stack is used when a media sheet from that given subset of sheets from the second media stack is transferred from the second media source.