A band saw 10 in order to cut out of the body of the animals is equipped with two rollers 13 and 14 on which is guided a band 15. / p & & p & the roller 14 can be moved in order to modify its axial distance with the other roller 13. For this purpose, the roller 14 is guided in longitudinal displacement in a slide. The displacement of the slide is effected by means of a tensioning device 17, the total stroke is preferably limited. The tensioning device 17 does not allow a maximum voltage of the saw-blade 15 preferably predetermined, whatever the - to be of the operator in the adjustment. / p & & p & any excessive tension of the saw-blade 15, and the risks of deterioration, which result therefrom, is thus prevented.
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