Flatbed weigh system with vacuum capstan roller
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United States of America Patent
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Sep 10, 2013
Grant Date -
Jan 6, 2011
app pub date -
Sep 17, 2010
filing date -
Sep 13, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A flatbed weigh system and methods for weighing substantially flat articles such as mail flats while they are moving. A weigh system has an intake plate (2102) and an accelerator assembly (2100) that receives an article (2150) and accelerates it to a selected velocity. Acceleration is controlled by a servo motor (2112) which in turn is driven by a precision closed-loop servo system (FIG. 12) that accumulates motor torque data to determine the article weight. The accelerator assembly uses vacuum pressure (2130, 2132) to hold the moving article in engagement with a cylindrical capstan roller (2110) while it is being weighed. This vacuum-driven concept eliminates the need for a pinch roller to hold the moving article against a capstan roller as in other designs. Because the pinch roller is eliminated, there is essentially no “bouncing” to address, so dampen is obviated. Further, the vacuum design is not adversely affected by variations in thickness of the article under test as in the pinch roller designs.
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