Motor-driven tensioning and winding device for lashing straps including an integrated control of the lashing tension

A tensioning and winding device for lashing straps comprising:

• a drive motor;
• a wind-up spindle driven by said drive motor for winding up a lashing strap, said lashing strap having a flat side;
• and
• a measurement sensor means for measuring tension in said lashing strap, said sensor means comprising:
• a) a sensor tongue abutting against the flat side of said lashing strap;
• b) two projections which between them guide and laterally flank the sensor tongue, said projections including end faces which abut against the flat side of said lashing strap and together with said sensor tongue define a three-point measuring element, said measuring element bending the lashing strap through a slope angle as defined by three points of tangency where the lashing strap makes contact with said end faces and said sensor tongue disposed therebetween, whereby said sensor tongue abuts against the lashing strap and exerts a deflection pressure against said lashing strap, said sensor means measuring the deflection pressure exerted by said sensor tongue on the lashing strap as a measured value of the tension in said lashing strap;
• and
• c) means for transmitting the measured value as an actual value to a control circuit for turning on the drive motor for the wind-up spindle so as to maintain a desired lashing tension.