Weighing scales – With recorder
Patent
1998-10-07
2000-06-27
Gibson, Randy W.
Weighing scales
With recorder
177 5, 177121, 177145, 177184, 177189, G01G 2338, G01G 1304, G01G 1900, G01G 2110
Patent
active
06080937&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for weighing and labeling packages of goods according to which each package is supplied to an electronic scale that is connected to an electronic analyzer, which contains a computer, by means of which the weight of the package is determined and the associated price is calculated, whereby the package is conveyed further on the scale and after the weighing process it is supplied to a labeling system that is controlled by the computer for printing a label and applying the label to the package, whereafter the package is withdrawn as well as an apparatus for carrying out this method according to which the load carrying mechanism of the electronic scale is embodied as a conveyor belt, whereby the apparatus further includes a supply means and a withdrawal means for the packages as well as the labeling system that is controlled by the computer.
Methods and apparatus of this type are known. The known methods are carried out by means of relatively complicated apparatus and serve, for example, for weighing packaged goods arriving within a transport line or after a packaging machine, and for labeling the price. The known apparatus are therefore relatively expensive because in general a plurality of conveyor belts are required in order to separate the weighing process from the labeling process. Up to now this seemed necessary due to the fact that during labeling on the scale considerable problems arose. Due to the pressure loading of the scale that occurred during the labeling, especially when the labeling is to occur rapidly and correspondingly severe impacts act upon the scales, the scales undergo damage over time. Such damage can be manifested by a decrease in the precision of the scale or that when relieved of load it never fully returns to zero. Furthermore, the vibrations of the scale that result during the labeling have an aftereffect for a certain period of time. Since the scales must mechanically and electrically come to rest prior to the next weighing process, the number of weighings that can be carried out per minute are limited.
The object of the present invention is to develop a method and well as an apparatus of the aforementioned type in such a way that with a very compact, economical and technically uncomplicated construction of the apparatus, the weighing process can be carried out rapidly and with the required precision.
SUMMARY OF THE INVENTION
The realization of this object takes place according to the method in that at least during the weighing process the package is conveyed forward on the scale at a speed that is less than the supply speed and the withdrawal speed, and in that the application of the label, after termination of the weighing process, is effected on the scale itself, whereby disruptions of the scale, caused by vibrations resulting from the conveying and labeling of the package, are eliminated on the one hand by a sufficiently high dead weight between scale and package and on the other hand by a low-pass filter that is disposed in the analyzer and according to the apparatus in that the labeling system is disposed in the vicinity of the conveyor belt such that application of a label on a package is effected during forward conveying of the package on the conveyor belt, wherein the load carrying mechanism, which includes the conveyor belt, has a dead weight that is greater than the maximum weight of the packages that are to be weighed, and wherein at least one low-pass filter is disposed in the electronic analyzer, the low-pass filter having a threshhold frequency below 5 Hz.
Advantageous further developments of the invention are described in the dependent claims.
The invention proceeds from the basic idea that it is quite possible to carry out labeling on the scale itself if special measures are under-taken to ensure that the weighing process can progress in an undisturbed manner and the vibrations of the labeling process are mechanically and electrically dampened in such a way that after the weighing and labeling the sc
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de Miranda Guillaume Roberto
Korthauer Manfred
Espera-Werke GmbH
Gibson Randy W.
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