BAND SAW

To provide a band saw that allows efficient automatic adjustment of operation speed without experience and is capable of automatically avoiding resonance without pre-measuring the resonance frequency.SOLUTION: A band saw 10 includes: an endless saw blade 24; a pair of wheels 26 on which the saw blade 24 is wound; cutting means 20 having a rotating motor 28 that is connected to one of the wheels 26 and driven to rotate; and feed means 30 having a feed motor 32 which moves the cutting means 20 in a cutting direction. The band saw includes: a vibration measurement sensor 40 for detecting vibration that is generated during cutting; a frequency analysis unit 80 for analyzing a measurement of the vibration measurement sensor 40 per frequency and indicating a peak intensity; a determination unit 60 for determining whether or not the peak intensity of the frequency analysis unit 80 is equal to or greater than a set peak value and whether it agrees with an estimated cutting frequency of a saw blade pitch; and a control unit 70 for controlling at least one of a rotating speed of the rotating motor 28 and a rotating speed of the feed motor 32 based on the determination of the determination unit 60.SELECTED DRAWING: Figure 1 【課題】経験がなくても運転速度を効率良く自動調整し、共振周波数を予め計測しなくても共振を自動回避できるバンドソーを提供する。【解決手段】無端状の鋸刃２４と、前記鋸刃２４を掛け回す一対のホイール２６と、一方の前記ホイール２６に接続して回転駆動させる回転用モータ２８を有する切断手段２０と、前記切断手段２０を切断方向に移動させる送り用モータ３２を有する送り手段３０を備えたバンドソー１０において、切断時に発生する振動を検出する振動計測センサー４０と、振動計測センサー４０の測定値を周波数ごとに分解してピーク強度を表す周波数解析部８０と、周波数解析部８０のピーク強度がピーク設定値以上か、及び鋸刃ピッチの推定切削周波数と一致するか否かを判定する判定部６０と、前記判定部６０の判定に基づいて、前記回転用モータ２８の回転速度と、前記送り用モータ３２の回転速度の少なくとも一方を制御する制御部７０を備えた。【選択図】図１