Cutting-off machine for a venetian blind

A cutting-off machine for a Venetian blind which includes a headrail, a bottom rail and a plurality of juxtaposed slats mounted between said headrail and said bottom rail, and said cutting-off machine comprising:

• a working table including a top wall having a first side and a second side;
• a fastening device mounted on said first side of said top wall of said working table and comprising:
• a headrail positioning base fixedly mounted on said first side of said top wall of said working table and containing a first guiding groove adapted for passage of said headrail;
• a slat positioning base fixedly mounted on said first side of said top wall of said working table and containing a guiding opening adapted for passage of said plurality of juxtaposed slats;
• a bottom rail positioning base adjustably fixed on said first side of said top wall of said working table and containing a second guiding groove adapted for passage of said bottom rail;
• a base fixedly mounted on said first side of said top wall of said working table and including a first end portion and a second end portion;
• a side plate including a first end portion fixedly mounted on said first end portion of said base and a second end portion;
• and
• a top plate disposed in parallel with said base and including a first end portion fixedly mounted on said second end portion of said side plate, wherein said headrail positioning base and said slat positioning base are fixedly mounted between said base and said top plate and said bottom rail positioning base is slidably mounted between said base and said top plate and is adjustably movable between said slat positioning base and said side plate;
• an elongate cutting blade slidably mounted on said fastening device and including
• a first end face slidably mounted on said headrail positioning base and containing a first slot adapted for passage of said headrail and formed with a first cutting edge abutting said headrail, and including a second end face slidably mounted on said slat positioning base and said bottom rail positioning base and containing a second slot adapted for passage of said slats and said bottom rail and formed with a second cutting edge abutting one of said slats;
• and
• a control device mounted on said second side of said top wall of said working table and connected with said cutting blade for moving said cutting blade.