What is the Principle of a Step Feeder?

The working principle of a step feeder can be summarized in three core steps, forming a typical “push-return-wait” cycle:

1. Reset and Loading

• Process: The pusher is in its retracted home position. Parts in the hopper fall by gravity to fill the space in front of the pusher.
• Purpose: Prepares parts for the next feeding cycle.

2. Advancing and Separating

• Process: The actuator moves the pusher forward in a straight line. The pusher engages the foremost part(s), moving them along a guide track.
• Core Principle: The hopper is designed to allow only a single layer of parts. The pusher’s action separates the leading part from the bulk stack.

3. Dwell and Retraction

• Process: The pusher moves the part to a precise location, dwells briefly, and then retracts to its home position.
• Purpose: Completes one feed cycle and allows new parts to fill the space for the next cycle.

The system is often controlled by sensors and a PLC for full automation.

In summary, a pusher feeder uses a simple linear reciprocating motion combined with precise mechanics to reliably separate and feed parts. It is ideal for handling parts that are prone to tangling or damage, which are unsuitable for vibratory bowls.