Sheet thickness measurement apparatus

摘要

An apparatus and method for measuring substrate media thickness including a nip assembly having a first nip for engaging substrate media and transporting the media along a process direction. The first nip has a nip velocity. A sensor is in operative communication with the first nip for sensing the nip velocity. A processor is operably connected to the sensor. The processor determines a media thickness responsive to a change in nip velocity detected by the velocity sensor upon entry of the media in the first nip.

主权项

1. A substrate media thickness measuring apparatus comprising:
a first nip assembly including a first nip having a drive roller and an idler roller, and a biasing device urging the drive roller and idler roller together to generate a nip force, the first nip assembly transporting substrate media in a process direction; a sensor in operative communication with the first nip for sensing a nip velocity; and a processor operably connected to the sensor, the processor determining a media thickness responsive to the nip force generated by the biasing device and a change in nip velocity detected by the velocity sensor upon entry of the media into the first nip, wherein the nip velocity is the rotational velocity of the drive roller, and wherein the change in nip velocity is the difference in the rotational velocity of the drive roller before a leading edge of the media enters the first nip and the rotational velocity of the drive roller substantially coincident with the leading edge of the media fully entering the first nip.