SHIFT ALLOWANCE LENGTH DISPLAY DEVICE IN CONSTRUCTION MACHINERY

PURPOSE:To develop the machine faculty to the max. limit without depending onto feeling by selecting a calculation equation which represents each shift limit of joint shafts and calculating and displaying the allowance length of shift in the vertical direction by using the above-described calculation equation from the coordinate values of the joint shafts at present. CONSTITUTION:The variation of the axis angle accompanied with operation is detected by each potentiometer 12a-12c installed onto the joint parts of the joint shafts 11a-11c. The data is converted to the digital value by an A/D converter 13b and continuously inputted into a calculation device 14. While, also the instructed process No. data and instructed timing signal are inputted into the calculation device 14 from an instruction panel 15. In a memory device 16, the machine constants, arithmetic equation which represents the shift limit point, coordinate data for singular points, process No. accompanied with the vertical shift operation, and the shift direction data in this process are previously memorized, and inputted into the calculation device 14. Then, the allowance length in the vertical shift is calculated from each input value, and displayed on a display device 17. Therefore, the machine faculty can be developed to the max. limit.