Weighing scales – With weigher loading or unloading means
Patent
1991-05-10
1993-01-12
Miller, Jr., George H.
Weighing scales
With weigher loading or unloading means
177200, G01G 1900
Patent
active
051782278
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a maritime weighing system of wherein a type, the weighing unit and associated weighing cell is supplemented with a quite similar and immediately adjacent weighing unit for a weight body having a known gravity, with the respective weighing cells being connected to a read out unit, in which a weighing result is corrected for errors due to movements of the entire weighing equipment in the direction of the gravity.
BACKGROUND OF THE INVENTION
The supplementary weighing unit will constitute or appear as an accelerometer, which will detect the vertical movements of the ship in such a manner that these movements, which, as well known may be quite violent and disabling for the use of conventional weighing units with weighing cells, will, in principle, be without any influence on the weighing result, because the weighing results will continually be corrected for the disturbing influence from the movements of the ship in the sea.
Admittedly weighings at sea may thus take place with a certain accuracy, which, however, is not particularly high. Guiding coarse weighings may be effected, but not such accurate small portion weighings, which will be required for achieving the highly desirable result that a maritime processing equipment can be usable for producing fish products for retail sale. So far it has been common practice to distinguish sharply between maritime catching and coarse treating equipment at one side and shore based treating and portion packing equipment at the other side, and no doubt this distinguishing whether consciously or unconsciously is due to the fact that at sea it has not been possible to carry out such weighings, which are sufficiently accurate for an economical preparation and marketing of products to the retailing trade.
SUMMARY OF THE INVENTION
On this background the invention departs from the circumstance that industrially it will be possible to achieve an important simplification and improvement in the working up of fish products for retail sale, if the working up and the associated accurate weighing out of the products can take place on the catch ships quickly after the hauling in of the catch. It is an important associated condition, however, that the products for the retail sale can be weighed out with a high accuracy, such that the required minimum weights per product portion will not give rise to any accumulated overweight of a substantial magnitude.
For the invention it is thus extremely decisive that the maritime weighing systems be regarded as precision devices, the weighing errors of which, despite the use of the accelerometers, are sought to be avoided.
These inaccuracies can be divided into two main groups, namely, for one part physical noise problems originating from extreme accelerations and from shakings of the weighing equipment, and for another part electrical stability problems in the weighing systems, e.g. caused by temperature fluctuations in the close surroundings.
These problems are closely interrelated, because it cannot be immediately whether errors occur and still less whether it is one or another error source which is active, and it cannot even be determined whether an electrical error occurs in the product weighing unit or in the accelerometer unit or in both these units. This would be easy to detect in a stationary system, but with a maritime system in the sea there are no fixed references for checkweighings, because in these circumstances the physical noise problems will exist.
In connection with the invention it has been realized that it is mandatory to cope with both of the said sets of problems for accomplishing the desired good result in practice. The electrical errors may well in advance be minimized so as to be very close to zero, but so far only with the use of components that are so costly that the systems will be far too expensive for industrial use. Instead of that, therefore, it is necessary to concentrate on detecting an actually occurring error and arrange for an immediate compensation
REFERENCES:
patent: 3322222 (1967-05-01), Baur
patent: 4212361 (1980-07-01), Stocker
patent: 4396080 (1983-08-01), Dee
patent: 4624331 (1986-11-01), Naito
patent: 5050693 (1991-09-01), Wirth et al.
Childress & Mickel, A Motion Compensated Shipboard Precision Balance System, Nov. 1980, Deep-Sea Research vol. 27, No. 11A.
Bomholt John
Kvisgaard Thorkild
Miller Jr. George H.
Scanvagt A/S
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