In the 10th issue of 1992, "Mechanical Workers published a article on "Quick Unloading Nuts" written by Comrade Li Jun in a magazine. After the enlightenment, it was inspired that this structure was used for the clamping plate clamping mechanism, for the adjustable pad and for the platen. The clamping mechanism has a quick release function. The structure of the quick release plate of the flattened screw is shown in the figure. The platen 4 screw hole slot can slide up and down along the milling screw 5. When clamping the workpiece, the pressure can be applied
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