Steel-sheet snaking preventing device and steel-sheet snaking preventing method for vertical looper

A steel-sheet snaking preventing device for a vertical looper, the device comprising:

• a jack mechanism provided at each of at least two corners of a looper carriage and coupled via a metal fitting to a chain or a wire rope that pulls the looper carriage;
• a tilt meter configured to detect an amount of tilt of the looper carriage;
• a snaking detector configured to detect an amount of snaking of a steel sheet in the looper;
• a level meter configured to detect a height of the looper carriage;
• a signal detection receiver configured to receive detection signals from the tilt meter, the snaking detector, and the level meter;
• and
• a controller configured to send the amount of raising or lowering of the corner of the looper carriage as a command to the jack mechanism, and control the amount of tilt of the looper carriage by the jack mechanism based on the detection signals from the tilt meter and the level meter.