一、发明背景对于我们来说,写错画错是常有的事,可不断用橡皮或把铅笔上的橡皮翻过来擦,反反复复比较麻烦;我们在用尺子和三角板之类的工具作图或画画时,经常感觉到从桌面拿起尺子和三角板很不容易;在毛笔书法训练时,由于没有正确的握笔器,所以我们很难一下子就 I. Background of the Invention It is a common occurrence for us to mistakenly paint mistakes. It is troublesome to repeatedly rub the eraser over the pencil or eraser. We are using tools like a ruler and a setter When drawing or drawing, I often feel it is not easy to pick up the ruler and the gusset plate from the desktop. In the brush calligraphy training, because there is no proper gripper, it is very difficult for us