Abstract: A circular saw sharpener comprising a base mounted on a work table at the top, a bracket pivoted thereto at the top which bracket has a L-shaped frame pivoted thereto at the top for holding a motor and a grinding wheel, a guide arrangement mounted on said bracket at the bottom for guiding the circular saw blade to be sharpened, a feed mechanism mounted on said base and controlled by a hand lever to carry the circular saw blade to be sharpened toward said grinding wheel for grinding. The level position of the circular saw blade to be sharpened can be adjusted by an adjusting knob. The angular position of the sand wheel can be adjusted by a lock screw, to fit the inclination of the teeth on the circular saw blade to be sharpened.

Abstract: A table-top copying machine comprising a H-shaped sliding frame assembly mounted to slide forward and backward on the base frame thereof, a copying mechanism mounted to slide leftward and rightward on said H-shaped sliding frame assembly, a first positioning mechanism for holding block-shaped working piece and model, and a second positioning mechanism for holding flat-shaped working piece and model. By means of the control of the H-shaped sliding frame assembly and the copying mechanism itself, working piece and model can be moved forward, backward, leftward and rightward. By means of the control of the first positioning mechanism, working piece and model can be rotated vertically.

Abstract: A hand-operated copying machine which can be efficiently operated to precisely perform copying process is including a frame assembly, a positioning adjusting mechanism and a vertical fixture assembly. The frame assembly includes a copying frame comprising copying tools and pilot rod efficiently controlled by means of a handle. The positioning adjusting mechanism which includes lock screw, scale knob, fixing element and locating element respectively mounted on the positioning holes of a front rod for flexible positioning control of working piece through the adjustment of the scale knob. The vertical fixture assembly includes three locating disc having mounted thereon fixed chuck element, movable chuck element arranged to match with screw bolt and jaw element served to firmily retain the working piece for performing copying process.