pull-feeder architecture and selection hub
A pull feeder fits only when downstream traction reduces compression without creating excessive tension; support spans, die drag, master control and fault recovery must be designed.
Scope and Evidence Status
This URL is written as a bounded technical decision page for downstream pull-feeder architecture for thin or difficult strip. It does not claim a confidential customer result, certified finished product or universal machine capability. Any future case-study statement needs the records listed below.
Application-Specific Process Route
The labeled route below is a conceptual engineering diagram—not a photograph of a delivered project. It makes the current page intent visible without presenting generic equipment images as application proof.
Inputs to Freeze Before Selection
- Material/temper, thickness, width, surface and tensile sensitivity
- Unsupported spans, guides, die drag and process resistance
- Pull-roll contact, pressure, wrap/support and allowed marks
- Upstream payoff/straightener/feeder relationship
- Master reference, buffer/tension feedback and command limits
- Slip, stretch, wrinkle, mark and pitch acceptance plus recovery plan
Context Images and Their Limits
Engineering Decision and Verification Table
| Decision gate | How to verify | Required record |
|---|---|---|
| Architecture fit | Compare push-only and downstream-pull behavior | Selection record |
| Contact/traction | Run actual material through pull point | Marked samples/load trend |
| Control stability | Trend buffer/tension across rate changes | Control record |
| Fault recovery | Trigger slip/feedback/stop conditions | Safe recovery test |
Page-Specific Method
Work through the four gates below with the production drawing, material and real machine interface. Each gate produces a record that can be independently reviewed instead of relying on a generic industry claim.
Architecture fit
Compare push-only and downstream-pull behavior Record: Selection record
Contact/traction
Run actual material through pull point Record: Marked samples/load trend
Control stability
Trend buffer/tension across rate changes Record: Control record
Fault recovery
Trigger slip/feedback/stop conditions Record: Safe recovery test
Failure Modes, Stop Conditions and Boundaries
- Over-tension: Stop on stretch, necking or dimensional change
- Two masters: Do not allow upstream/downstream axes to fight
- Image implication: Use the labeled control route when photos do not show pull position
Acceptance Record for This Page
Freeze the released drawing and material revision, machine configuration, interface list, recipe, sample plan and measuring method. Record exceptions and the safe restart route. A publishable result must identify the tested configuration; otherwise retain this page as an engineering guide.
Source and Verification Boundary
HENLI thin-strip push–pull reference. This reference shows the push/pull layout boundary; material-specific tension and surface acceptance still require trials.
Related HENLI Resources
One-Feed-One-Pull Servo Layout: Tension and SynchronizationRead this guide for one-feed-one-pull servo synchronization.
High-Speed Gripper Feeder Selection: Pitch, Grip and ReleaseRead this guide for high-speed gripper-feeder selection.
Request a Page-Specific Engineering Review
Send the drawing, material, line sequence, target cycle, interfaces and acceptance method for downstream pull-feeder architecture for thin or difficult strip. HENLI can confirm what is standard, what remains engineered and what evidence can be published.
Request an Application ReviewView the Referenced Equipment Source
