Weighing scales – Weigher responsive material control – Rotary
Patent
1990-10-24
1992-09-29
Miller, Jr., George H.
Weighing scales
Weigher responsive material control
Rotary
177165, 222368, G01G 1322, G01G 2314, G01F 1110
Patent
active
051507587
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE PRESENT INVENTION
The invention is directed to a rotary receptacle scale comprising a cup receptacle and mechanical positive guidance means for the movement of the weighing receptacle in a casing from a filling position to an emptying position.
BACKGROUND ART
The French patent FR-PS 1 131 825 shows an automatic scale as has been used for many decades in the cereals processing industry for control purposes and for controlling the product flow. It concerns an automatic operation within the framework of the classical weighing technology. A scale pan is filled with product, the weight of the full scale pan is determined after a short settling time, the scale pan is tipped, emptied out and returned to the filling position. The tare weight can be determined at least when weighing for the first time and the weighed bulk product can be calculated. The tare weight is compensated for in many cases, so that the precise weight of every fill can be determined every time in a desired repetition. A determined weight can thus also be preadjusted with corresponding control of metering devices, so that an identical weight, e.g. 50 kg, is delivered with every weighing. This is periodically checked in the case of scales which are subject to weights and measures regulations.
The real disadvantage of this scale system, which is still widespread, consists in that the construction cost is approximately equally high in every case almost regardless of the magnitude of the scale, e.g. in the area of a scale pan content of 5 to 100 kg. Thus, a smaller scale can not be produced very inexpensively. Another disadvantage is the relatively complicated mechanical construction. The cleaning is impeded although there is a particularly large number of locations on the mechanism in which dust can settle. At present, in foodstuffs processing operations, strict demands are placed on hygiene. A complete encasing protects the mechanism from external influences, but creates dead spaces in the interior in which product deposits can remain until the foodstuffs or feedstuffs spoil.
The DDR patent 12 969 shows an automatic scale without housing which comprises a rotatably supported load drum. The weighing receptacle is constructed as a round drum and allows a very rapid rotation. The construction without housing shown in the DDR patent 12 969 would not be suitable for products giving off great quantities of dust, such as flour or feedstuffs components, or additional devices would have to be arranged for keeping the surroundings free of dust.
SUMMARY OF THE INVENTION
The invention has as an object the developing a rotary receptacle scale with means of simple construction, i.e. also inexpensively, which allows optimum operation with respect to hygiene.
The solution, according to the object, is characterized in that the weighing receptacle and the casing are constructed in the manner of a rotary lock (similar to a lock rotor and lock wheel housing), wherein the weighing receptacle preferably comprises a horizontally extending axis of rotation.
In contrast to a rotary lock, in which the lock rotor continuously executes complete rotational movements, the weighing receptacle only needs a rotation of 180.degree. from the filling position to the emptying position. The most simple, inexpensive, commercially available elements for the positive guidance movement of the cup receptacle are sufficient for ensuring this function. The movement of the weighing receptacle in the housing, which is conceived in the manner of a lock, and in the casing, respectively, has a self-cleaning action with every weighing process. But the object proposed by the invention has accordingly been successfully met in a very advantageous manner with a minimum of individual elements and structural component parts and simple construction shapes.
The invention further allows a number of particularly advantageous constructions.
Thus, the cup preferably has a rotationally cylindrical shape in the opening area with respect to the center of rotation of the receptacle. The oute
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patent: 4682915 (1987-07-01), Hafner
patent: 4823993 (1989-04-01), Siegel et al.
patent: 4976378 (1990-12-01), Bush
Buehler AG
Miller Jr. George H.
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