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A Weighing Algorithm for Multihead Weighers  

Keraita James N. (Graduate School of Mechanical Engineering, Yeungnam University)
Kim, Kyo-Hyoung (School of Mechanical Engineering, Yeungnam University)
Publication Information
International Journal of Precision Engineering and Manufacturing / v.8, no.1, 2007 , pp. 21-26 More about this Journal
Abstract
In industry, multihead automatic combination weighers are used to provide accurate weights at high speed. To minimize giveaway, greater accuracy is desired, especially for valuable products. This paper describes a combination algorithm based on bit operation. The combination method is simple and saves time, since only the elements to be considered for combination are generated. The total number of combinations from which the desired output weight is chosen can be increased by extending the combination from memory hoppers to include some weighing hoppers. For an eight-channel weigher, three or four combination elements are best. In addition to targeting approximately equal amounts of products in each channel, this study investigated other schemes. Simulation results show that schemes targeting combination elements with an unequal distribution of the output weight are more accurate. The most accurate scheme involves supplying products to all memory and weighing hoppers before commencing the combination operation. However, this scheme takes more time.
Keywords
Multihead weigher; Combinatorics; Bit operation; Accurate weighments;
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Times Cited By Web Of Science : 2  (Related Records In Web of Science)
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  • Reference
1 Keay, M., 'Improving the multihead,' Machinery Update, pp. 38-42, 2005
2 Anritsu Corp.: http://www.anritsu-industry.com/E/
3 US Patent: http://www.freepatentsonline.com/4967383.html
4 McCaffrey, J., 'Using combinations to improve your software: test case generation,' MSDN Magazine, July 2004
5 Hongler, M. O. and Figour, J., 'Periodic versus chaotic dynamics in vibratory feeders,' Helvetica Physica Acta, Vol. 62, pp. 68-81, 1989
6 Han, I. and Lee, Y., 'Chaotic dynamics of repeated impacts in vibratory bowl feeders,' Journal of Sound and Vibration, Vol. 249, No. 3, pp. 529-541, 2002   DOI   ScienceOn
7 Lim, S. R., Choi, W. C., Song, J. B. and Hong, D., 'Error model and accuracy analysis of a cubic parallel device,' Journal of the KSPE, Vol. 2, No. 4, pp. 75-80, 2001
8 Bilwinco Weighers: http://www.bilwinco.com/
9 Mastro, S. A., 'The effect of transverse load on Fiber Bragg Grating measurements,' M.S. Thesis in Materials Engineering, Drexel University, 2000
10 Ishida Europe: http://www.ishidaeurope.com/
11 Lim, G. H., 'On the conveying velocity of a vibratory feeder,'' Computers and Structures, Vol. 62, pp. 197-203, 1997   DOI   ScienceOn
12 Maddox, M., 'Higher speed in prospect,' Machinery Update, pp. 60-63, 2001