34-Inch Double-Side Interchangeable Circular Knitting Machine

Interchangeable means controlled changeover

The archived machine is identified by a 34-inch, 12G and 72-feeder configuration, with a recorded 20 RPM reference. Its value is the ability to support more than one intended double-side setup through defined interchangeable components. That does not mean an operator can switch to any gauge or fabric without parts, timing work and a new acceptance sample.

At 12G, the machine is positioned toward medium/coarser double-knit structures where body, texture or durability matters. The old applications mention footwear, clothing and automotive interior fabrics. Each requires a different construction and downstream test, so the buyer must name the actual fabrics planned for the first production period.

Write a recipe for each setup

For every configuration, list the cylinder/dial components, needles, cams, yarn paths, feeders, take-down setting and tools required. Mark which items stay on the machine and which are change parts. Record the timing/alignment check made after installation. A setup is not complete until it has its own fabric sample and settings.

If a second gauge or structure is proposed, ask Kunyuan to identify the physical parts that change and the realistic changeover sequence. The archived 12G value belongs to the displayed model; any broader “12 to 36” statement needs a model-specific parts list and cannot be inferred from the name alone.

Changeover control table

Prove each fabric independently

Run the primary double-side structure with production yarn and inspect both faces, width, weight, loop uniformity, holes and repeating marks. After the planned changeover, do not rely on the first sample’s approval. Repeat the checks for the second structure and keep its parts/configuration record separate.

Measure changeover time only after the team can complete it safely and reproducibly. Include cleaning, alignment, first-off inspection and rejected fabric—not just the minutes spent swapping a component. If the buyer plans footwear or automotive use, apply the relevant bonding, abrasion or assembly tests outside the machine acceptance and attach them to that fabric recipe.

Prevent mixed parts and mixed settings

Store interchangeable parts in labelled sets and record wear or replacement. Before restart, verify cylinder/dial timing, needle and cam positions, yarn route, guards and take-down. A defect after changeover should first be checked against the change record rather than corrected by random tension changes.

Isolate the machine before installing parts. Keep the last accepted settings read-only or backed up so a new trial cannot erase the production recipe.

Check the factory before ordering conversion sets

Measure the lifting route, service clearance and storage area for cylinders, dials and tooling. Change parts that are stacked without protection can be damaged before they reach the machine. Ask how each set is packed, preserved and identified, and whether lifting fixtures are included. The quotation should also separate initial installation from later buyer-performed changeovers.

For spare planning, distinguish parts common to the base machine from items unique to one setup. Keep a minimum production plan for the primary fabric while an alternative set is being maintained. This turns interchangeability into useful capacity instead of creating a single machine that is stopped whenever one change set has a problem.