broj: 3-4/1996        pdf (28,4 MB)



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Znanstveno-stručno i staleško glasilo
Hrvatskoga šumarskoga društva
Journal of Forestry Society of Croatia
      Prvi puta izašao 1877. godine i neprekidno izlazi do današnjeg dana
   ISSN No.: 0373-1332              UDC 630* https://doi.org/10.31298/sl
upute autorima
WEB EDITION
ARHIVA ČASOPISA


HRČAK


 
ORIGINAL SCIENTIFIC PAPERS
     
Matić, S., Oršanić, M., Anić, I. UDK 630*221.4.001
Some Features and Problems Concerning Silver Fir (Abies alba Mill.) Selection Forests in Croatia     pdf     HR     EN 91
Hrašovec, B., Margaletić, J. UDK 630*449 : 323.3.001
Seed Pests and their Impact on Reforestation Efforts in Croatia     pdf     HR     EN 101
Španjol, Ž. UDK 502.7.001
Environmental Protection in the Republic of Croatia     pdf     HR     EN 107
Borzan, Ž., Idžojtić, M., Guttenberger, H. UDK 630*165.42.001 (Picea omorika Panč.)
Research on the Standardization of Gymnosperm Karyotypes using Picea Omorica as an Example     pdf     HR     EN 121
Sever, S. UDK 630*31+903+681 (497.13).001
Some Experience in the Attempt to Define Logging Strategies in Croatia, a Country in Transition     pdf     HR     EN 133
Horvat, D., Sever, S. UDK 631*352.5+319.4 : 630*232.326.2+236.9 : 631*072.16.001
Mulching Flail Mower - one Method for Mechanization of Stand Establishment and Treatment Operations     pdf     HR     EN 143
Krpan, A. P. B. UDK 630*379.001
Problem of Skidding Timber in Croatian Lowland Forests     pdf     HR     EN 151
Horvat, D., Sever, S. UDK 630*375.M--015.2 (234.5) : 630*377.2.001
Some Properties of the Skidders Used Mountain Forest Stand Thinning     pdf     HR     EN 157
Goglia, V., Horvat, D., Risović, S., Sever, S. UDK 332.14.839.31+861.0.001
Past and the Future of the Forest Biomass Utilization in Croatia     pdf     HR     EN 163
Kušan, V. UDK 630*587.001
The Approach to Remote Sensing and GIS in Croatian Forestry     pdf     HR     EN 171
Tomanić, S. UDK 630*689.001
Choise of Subject of Research in Forest Operations     pdf     HR     EN 179
Goglia, V. UDK 630*362.7-015.21(083.7)001
Parameters Influenting the Vibration Level of Portable Chain Saw     pdf     HR     EN 187
Goglia, V., Beljo, R. UDK 630*822.34:621*935+9.02.001
Lateral Movement of the Band Saw Blade and Machine´s own Resistance Power in Relation to the Strain Force     pdf     HR     EN 195
Summary: In attempting to improve the band saw efficiency there is always the problem of the lateral movement of the band saw blade and of the losses due to the machine´s own resistances. The lateral movement of the band saw blade reduces both the quality of the saw surfaces, and the material yield. At the same time it requires higher energy standards. The energy losses occuring in the machine during transmission movement also increase the specific energy standards. The lateral movement of the band saw blade and the machine´s own resistances are significantly influenced by the strain force of the blade. Both, the references and the band saw producers, list a rather wide range of strain force values.

In order to determine the optimum strain force value for the given machine- tool system, a very comprehensive research work was done at the Faculty of Forestry, University of Zagreb. The strain force and the rotation frequency of the driving wheel were chosen as independent variables. The approximative value of the strain force was determined by the horizontal force and the lateral displacement of the blade. The rotation frequency of the driving wheel was varied by frequency transformer. The lateral displacement value of the band saw blade was measured by inductive transducer. The machine´s own resistances power was measured by electric measuring instruments.

The research will contribute to the more objective determination of the strain force of the band saw blade, which is one of the most important parameters of the band saw efficiency.
Key words: band saw efficiency; blade lateral movement; machine´s own resistance power; strain force
Korpel, Š. UDK 630*228.81+221.4.001
Development and Strukture of Beech-Fir Virgin Forests and their Application to the Selection Forest Management     pdf     HR     EN 203

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