On a high-mix line the product changes, not the machine. Every changeover is a fixed cost paid once per order, and on small batches that cost lands on very few boards. Feeders are only one part of the changeover, but they are the part that can be prepared before the line stops.
Where the minutes go
Changeover work normally splits into five groups:
| Group | Typical work |
|---|---|
| Teardown | Remove the previous product’s feeders and material, clear the line |
| Setup | Load the new product’s material, mount feeders in their slots |
| Verification | Check part numbers against the setup sheet, confirm positions |
| Program | Load and confirm the machine program and board coordinates |
| Initial article | Run and inspect the initial board |
Only teardown and the physical mounting have to happen at the machine. Loading material and verifying part numbers against the setup sheet are paperwork and handling — they can be done on a bench, before the line stops.
Why this is the standard method now
Splitting setup work into steps that must happen while the machine is stopped and steps that can happen outside it is the core of SMED (single-minute exchange of die), the changeover method Shigeo Shingo documented for Toyota and that SMT plants apply to line conversion. Chinese EMS plants describe the same two buckets as 内部作业 and 外部作业 — internal work needs the machine stopped, external work does not — and treat the conversion of one into the other as the main lever on line utilisation.
The pressure comes from order structure. Reporting from EMS production in 2026 describes batches of 50 to 5,000 boards as the mainstream, with some plants running eight to twelve changeovers a day and peaks far above that. When changeover frequency rises, the minutes per changeover decide whether the line is producing or waiting, and the operations you can move off the machine are where the return is largest — they cost spare feeders and a cart, not a new machine.
What moves off the machine
A feeder cart plus a spare set of feeders lets you load and check the next product while the current one still runs. For label feeders the operations that move offline are:
- Loading a fresh label reel and threading the carrier tape.
- Recording which label is on which feeder, so the setup sheet can be checked away from the machine.
- Checking reel capacity, so you do not stop mid-order for a reload.
The standard body with an upward-facing screen (LFSID models) keeps the panel readable while the feeder sits on a cart or in a slot, which is what makes bench-side checking practical. Miniature bodies fit machines where slot space is tight but leave less room for on-feeder controls.
Reel capacity sets how often you stop
A reload is a partial changeover: the line stops, someone fetches material, threads it, and restarts. How often that happens is set by reel capacity, not by feeder speed:
- Standard reel: 76.2 mm bore, 200 mm outer diameter; other sizes to order.
- Labels per reel = usable web length ÷ label pitch, so a tighter pitch or thinner web means more labels per reel.
If a run will outlast one reel, plan the reload at a natural break instead of discovering it. Knowing labels per reel for your own label is a single calculation from your pitch — your label supplier has that number.
Match the feeding cycle to the takt
The feeder’s feeding cycle is 0.1–2 s, and the recommended panel setting is 30–50 for work where placement speed is not the constraint. Running the feed faster than the takt needs does not shorten the cycle; it wears material and increases the chance of a mis-pick. On a line that changes products several times a day, reliability at moderate speed beats a fast setting nobody can supervise.
Where multi-column and sheet options help
If a board carries several labels, one feeder can hold multiple columns, so a multi-label product does not need extra slots. For sheet labels, the sheet feeder runs a 2–3 s cycle and can carry formats a reel cannot — the trade is speed, not capability. The whole range is on the label feeder line page, and the LFSID-100S page lists the standard-body figures.
What to measure on your line
Time one changeover and split it into the five groups above. If setup and verification together are more than a third of the total, an offline feeder set is worth costing. Send us your product mix, the labels used per product, and how many feeders you change at once — we can tell you how many spare feeders that needs.