Length measuring device

Abstract

The invention relates to a length measuring device capable of controlling the cutting blade of a cutting device to precisely position itself at a specified cutting angle. Length measuring machine (1) for use in conjunction with cutting device (9) with cutting blade (91) to measure the length of the workpiece cut by the cutting blade (91) with sliding rail (13) which is fixed relative to the cutting device (9) when the length is measured; and the sliding assembly (20) which is fitted onto the sliding rail (13), the sliding assembly (20) has a sliding body (21), a length measuring assembly (60) to measure the distance along which the sliding body (21) moves sliding relative to the sliding rail (13), and the lever assembly (30) which comes into contact with the workpiece when the workpiece is placed at the cutting position; In which the sliding assembly (20) also has an angle measuring unit (40), which is installed at the end of the lever part (30) in contact with the workpiece, this angle measuring unit comes into contact with the cutting blade (91) and measures the cutting angle of the cutting blade (91).