PROBLEM TO BE SOLVED: To provide a cutting device which can efficiently and uniformly smoothen the sliding face of a trolley line by omitting difficult hand work by workers.
SOLUTION: A device for cutting the sliding face of a trolley line is constituted on a truck 2 which can move on rails in the longitudinal direction. That is, a slide base 3 is provided on the truck 2 so as to be operable in the right and left directions. A support frame 4 is provided on the slide base 3 so as to be vertically movable, and an air cylinder 7 is arranged to vertically move the support frame 4. A rocking arm 5 is pivotally supported on the support frame 4 so as to be balanced horizontally. A pair of front and rear push up rollers 10 are supported on the rocking frame 5, and a grinding wheel 11 is supported at a middle position between the rollers 10. The grinding wheel 11 is driven by a motor 21 to be horizontally rotated and can be vertically moved. The top face of the grinding wheel 11 is brought into contact with the lower face of the trolley line T. The air pressure for the air cylinder is controlled so that the rollers 10 always press the trolley line T at the same pressure.