Packing weight control
On cheese and sausage cutting machines, large blocks are cut into smaller portions of a certain number of slices with a specified weight. Up to 1000 cuts per minute can be achieved. The aim is to achieve a particular weight with a constant number of slices. For legal reasons, the weight may not fall significantly short but on cost grounds excess weight should not be cut. A camera system is used to achieve this.
The application requires a very fast system for image acquisition and analysis. As the product width can be up to 250 mm or two blocks can be fed simultaneously, a high resolution camera is also necessary on larger machines. During analysis, the cutting area of the block in mm2 is determined and the density is then used to calculate the required thickness of the next slice. The high-speed servo motor then makes the corresponding adjustment in ms. At very high speeds, each individual slice is not adjusted in practical terms. Nevertheless, the function is available as changes to the contour of the sausage or the holes in the cheese are not sudden. The system receives feedback from the downstream scales and automatically adjusts itself to the correct actual values.
The camera system results in a higher yield of good products, as better use is made of the initial and end pieces. A significant amount of product is also saved due to the closer proximity to the nominal weight. The large quantities of cut products mean that the investment in the machine vision system is amortised within a short period of time. Cooperation with machine manufacturer CFS Kempten also ensures that a single-source system optimised for these machines is delivered.