Difference Between Mechanical Release and Pneumatic Release of Coil Feeder

The release methods of coil feeders are divided into mechanical release and pneumatic release. During feeding, the rollers clamp the coil to ensure stable and precise material delivery; during stamping, the rollers are in a released state. This article will help you understand the features and differences of these two release methods.

Working Principle

The pressure of mechanical-release rollers comes from mechanical springs, and the pressure of pneumatic-release rollers comes from compressed air. The coil feeder receives a signal from the press to perform the release action.

1. Mechanical Release

A mechanical-release feeder obtains its signal through a release lever. A release lever is installed on the press. When the press moves downward, it hits the feeder's release lever and transmits the signal.

2. Pneumatic Release

A pneumatic-release feeder receives an electrical signal. The main components of the pneumatic system are the solenoid valve and the FRL unit. The FRL unit (components may vary by application) includes a Filter (F), Regulator (R) and Lubricator (L). After receiving the signal, the solenoid valve opens or closes the spool, while the FRL unit provides clean and stable air.

Capability Comparison

Mechanical release uses a direct mechanical linkage. It is stable, highly synchronized, and suitable for high-speed stamping. However, it requires installing a release lever on the press machines, which is not ideal for some large press machines, such as H-frame press machines.

Pneumatic release is affected by delays in electrical signals and air transmission. Its response speed is slower than mechanical release, and it is more prone to fluctuations. However, it is easier to install and works with any machine capable of sending an electrical signal. This means it is suitable for most presses and can even be used together with shearing machines.

Overall, pneumatic-release feeders are widely applicable, but mechanical-release feeders perform better in high-speed and high-precision stamping. If you are interested in coil feeders or have any questions, please contact us. Thanks for reading.