The Power of the Pivot: What Is a Bump Turn Conveyor and How Does It Work in Palletising?

In todays fast paced production environment, automation efficiency is measured in seconds and millimetres. Products such as cases, boxes, and totes rarely exit production lines in the ideal orientation for palletising. To build stable, space-efficient loads, items often need to be rotated—typically by 90° — to create interlocking pallet patterns.

A bump turn conveyor provides one of the simplest and most cost-effective methods of achieving this in-line product reorientation.

What Is a Bump Turn Conveyor?

A bump turn conveyor (also referred to as a bump rotator or turn-post conveyor) is a material handling device designed to rotate square or rectangular products as they travel along a conveyor line.

Rather than using motors, actuators, or robotics, the system relies on a mechanical interaction between the moving product and a guide or deflection element. The conveyor provides continuous forward motion, while the guide element forces a controlled change in orientation.

This makes bump turns particularly well suited to high-throughput palletising environments where simplicity, reliability, and uptime are key.

The video below shows a bump turn conveyor system.

How It Works in Palletising Applications

Palletising relies on precise layer formation to ensure load stability. By rotating selected cases, a palletiser can form an interlocked layer pattern, improving structural integrity during storage and transport.

A bump turn conveyor achieves this rotation through a controlled three-stage process:

1. Controlled Approach and Product Stability

The product enters the turning zone on a powered conveyor (belt or roller). The conveyor maintains consistent speed and alignment, ensuring the case is stable and square before entering the turn.

Low-friction surfaces or well-controlled roller sections are often used to support smooth transition through to the turning zone.

2. Controlled Deflection (“The Bump”)

A mechanical element/guide — typically an actuated bump stop, or wheel – is positioned offset from the conveyor centreline.

3. Rotation and Exit Alignment

As the conveyor continues to drive the case forward, the guide constrains one edge while the rest of the product is carried through, causing a controlled 90° rotation (depending on system layout).

Once the desired orientation is achieved, the case clears the guide element and proceeds downstream.

Downstream guide rails are typically used to:

• • Re-square the product

• • Maintain spacing and tracking

• • Present consistent orientation into the palletiser

Why Use a Bump Turn in Palletising Systems?

Bump turn conveyors remain widely used because they offer a strong balance of simplicity and performance:

• • Cost-effective solution
    Minimal mechanical complexity means lower installation and maintenance costs compared to powered turners or robotic systems.

• • High throughput operation
    Products are reoriented in-line without stopping or indexing, maintaining continuous flow to the palletiser.

• • Compact integration
    Bump turns can be incorporated directly into existing conveyor layouts with minimal footprint.

A bump turn conveyor is a proven, widely used solution for in-line product reorientation within palletising systems. Its effectiveness comes from controlled mechanical deflection rather than complex motion control, allowing reliable 90° product rotation at full production speed.

For many high-throughput packaging lines, it remains a practical combination of simplicity, reliability, and cost efficiency.

If you’d to discuss your requirements for palletising solutions, feel free to contact us on 01223 499488 or helpline@granta-automation.co.uk and we will be happy to help.