Importance

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Abstract

In a machine including structure for printing an indicia on a sheet at a predetermined printing speed, wherein the machine includes structure for feeding the sheet in a path of travel to the printing structure, apparatus for detecting a malfunction of the machine, the apparatus comprising, structure for controlling the machine, the controlling structure including a microprocessor, structure for sensing the sheet in the path of travel, the sensing structure including a first sensor connected to the microprocessor for providing a first sensing signal thereto in response to sensing the sheet, the sensing structure including a second sensor connected to the microprocessor for providing a second sensing signal thereto in response to sensing the sheet, and the microprocessor programmed for causing the sheet feeding structure to feed the sheet to the sensing structure at a first predetermined sheet feeding speed less than the printing speed, causing the printing structure to commence a printing cycle after a first predetermined time delay from the microprocessor receiving the first sensing signal, preventing the printing structure from commencing the printing cycle after a second predetermined time delay from the microprocessor receiving the first sensing signal if the second sensing signal is not previously received thereby, and causing the sheet feeding structure to feed the sheet at the printing speed if the second sensing signal is received by the microprocessor before the second predetermined time delay is ended.

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First Claim