A US-based writing instrument manufacturer planned to bring ball pen refill and pen spring assembly in-house instead of importing finished components from three separate vendors. Their goal was to cut landed cost and shorten replenishment cycles for a growing private-label writing pen programme. They selected our ball pen refill and spring assembly machine, configured for the American market and shipped to the USA with full commissioning support.
- Machine scope: One automatic line combining refill tube feeding, spring insertion, ink filling, tip press-fitting and finished refill ejection.
- Output target: At least 180 pieces per minute with a single operator per shift.
- Compatibility: Quick-change tooling for 0.7 mm and 1.0 mm refills, plus three spring free-lengths.
- Compliance: 480 V / 60 Hz three-phase power, UL-listed electrical components, English HMI.
- Delivery: Ship to USA door-to-door, including installation and operator training on site.
The line is built from independent stations — bowl feeding, orientation inspection, spring insertion, ink dosing, tip assembly and ejection — linked by a servo indexing conveyor. Any station can be isolated for maintenance without stopping the upstream feeders, which keeps overall uptime above 92%.
A camera station checks spring presence, spring compression height and refill tube orientation before ink filling. Faulty units are rejected automatically, so the downstream ink station never contaminates a defective assembly. This single feature removed the buyer's biggest historical complaint: missing springs inside sealed refills.
Servo-driven positive displacement pumps dose ink within ±0.01 g, with automatic correction based on rolling weight feedback. Centrifugal de-aeration before filling prevents air pockets that cause skipping in finished pens.
The machine was supplied with 480 V / 60 Hz three-phase wiring, UL-recognised components, Category 3 safety relays, interlocked guarding and an English-language HMI with recipe storage per refill model.
| Parameter | Specification |
|---|---|
| Machine type | Automatic ball pen refill and spring assembly line |
| Capacity | 100–120 pcs/min |
| Refill sizes | 0.7 mm / 1.0 mm, 3 spring lengths |
| Operators required | 1 per shift |
| Power supply | 480 V / 60 Hz / 3 phase |
| Shipping | 2 x 40HQ, sea freight, ship to USA |
| Installation | 12 days on site, including training |
- Stable output of 205 pcs/min measured over a 72-hour production run.
- Assembly defect rate below 0.6%, down from 3.1% with the previous manual and semi-auto process.
- Unit assembly cost reduced by 24% after replacing three external component suppliers.
- Changeover time of 25 minutes between refill models, allowing small private-label batches.
- The manufacturer now supplies its own refills to two regional distributors and plans a second line.
Importing refills and springs separately looks cheaper on paper, but freight, duty, damage and quality claims usually erase the gap. An in-house ball pen refill and spring assembly machine gives manufacturers direct control over spring tension, ink dose and tip fit — the three variables that decide whether a pen writes smoothly on the first stroke. With US-standard electrical compliance and on-site commissioning included, the line is productive from the first week rather than the first quarter.
We support ship to USA projects with 480 V configurations, English documentation, spare-parts kits and remote diagnostics. Tell us your target output and refill specification, and we will return a layout drawing and quotation within 48 hours.