Description

PFAFF 3741 and 3745 power line with docu-sewing

Extra Information

PFAFF 3741/375

 

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Documented quality:
The POWERLINE 3741 and 3745 are quality assurance systems designed for use on safety relevant seams. The PFAFF docu-sewing systems making an important contribution to extra driving safety. They monitor and guarantee perfect execution of the nominal breakage point on the reference seam from where the side airbag unfolds in the event of a serious incident. The seam must meet precisely stipulated parameters: on one hand it should not be too resistant as this will prevent the side airbag from expanding and unfolding; on the other hand the seam must have a minimum strength so that it does not tear open unexpected during normal use.
POWERLINE 3741 and 3745 machines signifi cantly increase process safety and reliability. An essential benefi t of these systems is to guarantee constant seam quality by identifying and sorting out unusable seams in real-time. This is important for product liability to counter and effectively refute any potential claims of recourse. 3741 and 3745 can be connected to the customer's ERP system - an important precondition especially in the automotive industry.
PFAFF docu-sewing systems are an important tool for quality assurance within the overall automotive production chain, even if it "just" deals with one simple element - an approx. 40 cm long seam section. Other possible fi elds of operation for the POWERLINE 3741 and 3745 are the production of parachutes, seatbelts, sails, awnings, tarpaulins - everything involving the production of safety relevant seams.

Mode of operation:
The necessary thresholds for the thread tension, stitch length and number of stitches are specified in the quality assurance system using test seams.
During the sewing process a sensor is monitoring in real-time the dynamic thread force ‘stitch by stitch’. On commissioning the system, an actuator automatically sets the thread tension (thread force) to the specified setpoint. If deviations are caused by external influences, the thread tension is automatically corrected (closed control circuit).
The configured stitch length and number of stitches are also monitored. The docu-system compares the measured values (stitch by stitch) with the previously entered thresholds and evaluates the seam quality. If the results are not within the specified tolerance area, a message is displayed (NOK = not ok).
In the event of the above, the data is still stored but no label is printed.