Anjelio Automation · Technical article

Single-Head vs Dual-Head vs 4-Axis Robot: Choosing a Vision Labeler Config

Choose VL-SS, VL-DD, or VL-4A by materials count, part pose variation, and line layout—with sample validation before quote.

Publisher: Anjelio · Published: 2026-09-12T07:40:15.682429905+00:00 · Substantively updated: 2026-09-23T08:45:01.942557961+00:00

About Anjelio & our information · Vision labeling guides

Decision summary: Pick the config by how many materials you place, how much the part pose moves, and how the station sits in the line—not by brochure headline. One material and a stable nest → start with single-head (VL-SS). Two materials in one pass → dual-head (VL-DD). Changing orientations, reach, or cell layouts → 4-axis robot (VL-4A). For definitions of CCD vision labeling, see the I1 buyer guide.

This page is about industrial vision label applicators (camera locate + servo place). It is not dataset “vision labeling” software, and not an AOI-only defect station.


Three questions before you pick a machine

  1. How many distinct materials land on one part in one cycle? One reel path, or two (or more) that must stay coordinated?
  2. How much does part pose vary? Fixed nest with small offset, or changing faces, angles, and reach into a cell?
  3. How does the station join the line? Free-standing cell, tray/PCB track, or embedded into an existing transfer?

Answer those first. Model codes come after. Final configuration is always subject to the mutually confirmed technical proposal and quotation—and to sample validation.


Single-head (VL-SS) — when it wins

VL-SS is the standard single-head single-feeder family: one applicator and one feeder for vision-guided single-material placement. Candidate uses on the catalogue include electronics/PCB and packaging labels; the PDP calls out PCB/FPC, plastic housings, and small packaging as typical selection scenes.

Choose VL-SS when

Catalogue reference (example only): 1 applicator head; 1200–2000 labels/h, subject to sample validation. Real rate depends on part size, vision settle, peel length, and transfer—never treat it as a guarantee for every SKU.

When not to force VL-SS: two different materials that must both land in one conveyor pass, or placement faces that a fixed head cannot reach cleanly.


Dual-head (VL-DD) — two materials / sequenced place

VL-DD is dual-head dual-feeder: two applicators and two material reels so different labels or auxiliary materials can place during one conveyor pass. Catalogue applications include electronics/PCB and multiple-material placement; selection depends on locating both targets, material handling, and cycle coordination.

Choose VL-DD when

Catalogue reference (example only): 2 applicator heads; 1000–2000 labels/h, subject to sample validation.

When not to force VL-DD: only one material forever—stay on single-head (or economy CCD). Three or four coordinated places—look at multi-head (VL-4H) instead of stretching dual-head.


4-axis robot (VL-4A) — pose and reach

VL-4A is the 4-axis robot vision labeler for varied products and changing placement orientations or cell layouts. The catalogue lists robotic vision placement and electronics/PCB; the PDP also names electronic housings, medical-device parts, and packaging as candidate uses. Robot reach, pickup tools, and fixtures depend on the actual part.

Choose VL-4A when

Catalogue reference (example only): 1 applicator head; 800–1500 labels/h, subject to sample validation.

When NOT to buy a robot

Robots add reach and orientation flexibility; they also add reach/tooling/guarding validation. Do not default to VL-4A for marketing reasons alone.


When to look beyond these three

Short pointers—full catalogue on /products:

NeedLook atCode
Three/four coordinated applicatorsFour-headVL-4H
PCB / tray-carried flowTrack-typeVL-TR
Drop into an existing lineEmbedded inlineVL-EM
Variable print + vision applyInline print-and-applyVL-PA
Fast packaging pick-and-placeDelta robotVL-DT
Soft / thin / die-cut feedRear-retract feederVL-RR
Large parts / long materialsLarge-formatVL-LF

For “what is vision labeling,” use I1. For name confusion with similarly spelled consumer brands, use I5.


Side-by-side checklist

Decision axisVL-SSVL-DDVL-4A
Materials in one passOneTwoTypically one (pose-focused)
Heads (config dependent)121
Best whenStable nest + single materialTwo materials / sequenced placeChanging orientation / reach
Avoid whenNeed two materials or odd facesOnly one material foreverNest already simple
Catalogue rate*1200–2000 /h1000–2000 /h800–1500 /h

*Catalogue reference rates are subject to sample validation. Not guaranteed for all parts.

For a first configuration recommendation, email sales@anjelio.com or use /contact.

Frequently asked questions

Does dual-head always beat two single-head stations?

Not always. Dual-head wins when both materials must finish in one pass and cycle coordination is defined. Two stations can still make sense for independent replenishment, different line segments, or staggered installation. Bring both materials and drawings to the RFQ.

Can you quote ±mm accuracy from this page?

No invented tolerances here. Placement capability is confirmed against your samples, features, and proposal—not from a generic FAQ number.

Is this the same as data-labeling software or AOI?

No. This chooser is for **vision-guided label applicators**. Dataset annotation tools and AOI defect stations use overlapping “vision” words but are different purchases. See I1 FAQ for the fuller fence.

What do you need for a first config recommendation?

Workpiece, label/material sizes, placement targets, vision constraints, handling method, and (for robots) reach, orientation, line interfaces, and guarding. Start at [/contact](/contact).

Need a recommendation for your product, label, or line speed?
Talk to Anjelio engineering