Coil spring interior assembly method and apparatus

Details Coil spring interior assembly method and apparatus Coil spring interior assembly method and apparatus

1995-09-27

1998-02-03

Echols, P. W.

Wireworking

Fabric making

Link and perforated plates

140108, B21F 2700, B21F 3300

Patent

active

057134006

ABSTRACT:
A spring interior assembly method and apparatus produces spring interiors formed of a plurality of longitudinally connected columns of spring coils. Preferably, the spring interiors are formed as continuous wire bands each of alternating coils and bridging sections. Corresponding, coils of each column are laced together with transverse lacing wires as the columns are indexed longitudinally through a lacing station and are adjusted to correct lengths as the spring interiors are assembled. A measurement device or other form of sensor at a measurement station downstream of the lacing station in the assembly machine signals the length of a portion of the spring interior, preferably including a number of bridging sections. A processor in the assembly machine controller causes the last laced section to be longitudinally deformed to adjust its length in response to the measurement. Preferably, a plurality of measurements and the adjustments are stored and analyzed by the processor which adjusts the correction response based on the analysis. The adjustment may be made to only stretch the interconnected columns of coils, and do so by only a fixed amount, when the measured length is shorter than a predetermined minimum, with no adjustment being otherwise made.

REFERENCES:
patent: 4886249 (1989-12-01), Docker et al.
patent: 5139054 (1992-08-01), Long et al.

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