Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Reexamination Certificate
1998-12-21
2001-09-25
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
C118S323000, C901S043000
Reexamination Certificate
active
06293157
ABSTRACT:
BACKGROUND OF THE INVENTION
Coriolis type flow meters are of course well known for use in sensing flow rates of various materials. Such meters have traditionally been designed for fixed applications.
SUMMARY OF THE INVENTION
It has been discovered that when such meters are utilized in non-stationary applications such as being attached into a robot for robotically applying sealants and adhesives and the like that a motion induced signal is provided which must be corrected that is, a flow may be shown even though the apparatus is not dispensing any fluid at all.
It is therefore an object of this invention to provide a method of compensating for this motion induced signal.
Several methods may be utilized in order to do so. First of all a second “dry” coriolis meter or other coriolis motion sensing device may be utilized along with the normal coriolis flow sensing meter to provide both a motion signal (from the dry meter) and a total resultant signal (from the normal meter). Thus, the motion signal may be subtracted from the total resultant signal to determine the true amount of flow.
In another application, only one meter is utilized but for a given robot motion program, the meter is run dry for a sample run which provides a motion signal which is then entered into a look-up table and subtracted from the total resultant signal during actual dispensing.
In yet another embodiment, two conventional meters are used in series with one being located on the moving object (robot) and the other being fixed.
These and other objects and advantages of the invention will appear more fully from the following description made in conjunction with the accompanying drawings wherein like reference characters refer to the same or similar parts throughout the several views.
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Adams James D.
Brennan Thomas J.
Ma Yamin
Farrow Douglas B.
Graco Minnesota Inc.
Patel Harshad
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