No Fault Forward Technology Provides Exceptional Quality Integrated In Towline Conveyor Systems

no fault forwardSI Systems Lo-Tow® towline conveyor systems can be equipped with No Fault Forward Technology that will not allow an assembly to move to the next work station in the process until all assembly steps required at that station are completed according to specification.

Quality control is the foundation of effective and efficient manufacturing.  As processes become more refined and more complex, quality control becomes an even more important element in the total quality concept. This is particularly true in assembly operations, especially those where slight variations in common assembly processes and procedures require strict adherence to work instructions that detail how a series of sequential tasks should be performed at an assembly station.

No Fault Forward Technology

No Fault Forward (NNF) control technology improves quality, improves assembly throughput and reduces warranty claims. Plus, collected data can be used to fine tune processes.

The Lo-Tow towline conveyor pulls carriers or carts along a path using a chain encased in an in-floor track section. The carriers are conveyed to work stations along the towline path where specific, progressive assembly operations are performed.

The towline conveyor can be designed in two assembly configurations, index & dwell and creeping. The configuration determines the type of No Fault Forward Technology that can be employed.

Index & dwell assembly towlines allow the operators to work on the product while it remains stationary at the workstation. The system’s cycle consists of a high-speed “index” between workstations followed by a static “dwell” at the workstation. Assembly operations are performed during the dwell portion of the cycle.

Creeping assembly towlines allow operators to work on the assembly as it creeps through their workstation. This configuration allows a continuous flow of product through the assembly process without lost time for indexes.  Also, by creeping at a slow speed matched exactly to the assembly time, the towline, rather than the operator, paces the assembly process.

In a non-NFF index and dwell towline assembly system, the index cycle is triggered by either a configurable timer that paces operators or by operator initiation using workstation push buttons. With No Fault Forward Technology , the system controller works in conjunction with these release triggers, inhibiting the release of the cart to the next station until a “permissive” signal from the Owner’s manufacturing system indicating all workstation assembly criteria has been satisfied.

SI Systems has been providing world class material handling and software systems for manufacturing, assembly, kitting, order fulfillment and warehouse operations for over 50 years. Systems include towline in-floor drag chain conveyor systems, NFF (No Fault Forward) assembly systems, Automated Guided Cart (AGC), Automated Guided Vehicle (AGV), WES, WMS and WCS software systems, order fulfillment dispensing A-Frames and integration services. Visit for more information and white papers on this subject or email: for more information.

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