To always cut a target article to have a specified weight automatically even if there is dispersion in material diameter by measuring a weight when the target article is carried out, calculating its result based on a material diameter and the specific gravity of the material and converting it into a cutting length.

A vice device 29 having a work outer diameter measuring device is provided adjacently to a hard die belt sawing machine 1, an unloading device 53 is provided in a product delivery side, and a holding member 65 is provided in the lower part of the support arm 61 of this unloading device 53 via a weight gauge 63. Further, a marking device 91 is provided for marking a cut article supported by the holding member 65. Thus, since a weight measured by the weight gauge 63 is converted into a cutting length and fed back for next cutting, the article is always cut automatically to have a specified weight.