Method for monitoring the tension of a pile yarn in a tufting machine and monitoring system

A monitoring system for monitoring the tension of a pile yarn in a tufting machine which is provided with several tufting needles and assumes cyclically successive machine positions in various machine cycles, wherein this pile yarn is incorporated in a fabric in the machine cycles by a tufting needle which is positioned in various needle positions at a respective distance from the fabric by positioning the tufting machine in the machine positions during each machine cycle, comprising:

• a unit for determining machine position data (Dm) that indicate one or more machine positions per machine cycle,
• a motion sensor for generating measurement signals (Dv) that indicate pile yarn consumption of this pile yarn, and
• an evaluation system for evaluating, within each machine cycle, the measurement signals (Dv) on the basis of the machine position data (Dm), thereby monitoring the tension of the pile yarn in the tufting machine, to determine if an error exists.

A monitoring system for monitoring the tension of a pile yarn in a tufting machine which is provided with several tufting needles and assumes cyclically successive machine positions in various machine cycles, wherein this pile yarn is incorporated in a fabric in the machine cycles by a tufting needle which is positioned in various needle positions at a respective distance from the fabric by positioning the tufting machine in the machine positions during each machine cycle, comprising:

• a unit for determining machine position data (Dm) that indicate one or more machine positions per machine cycle,
• a motion sensor for generating measurement signals (Dv) that indicate pile yarn consumption of this pile yarn, and
• an evaluation system for evaluating, within one machine cycle in the various machine cycles, the measurement signals (Dv) on the basis of the machine position data (Dm) to analyze behavior of yarn movement of the pile yarn within the one machine cycle, thereby monitoring the tension of the pile yarn in the tufting machine.