A paper feeding system, also known as a feeder system, is an integral part of printing presses and other paper-handling machines. It is responsible for accurately and smoothly feeding paper or other substrates into the printing or processing unit. The paper feeding system plays a crucial role in maintaining proper registration, preventing misfeeds, and ensuring consistent and reliable operation during the printing process.
The paper feeding system typically consists of the following key components:
- Feeder Tray: The feeder tray is the area where the paper or substrate is initially loaded before entering the printing press. It provides a stable and level surface for holding the stack of paper or substrate.
- Feed Board: The feed board is a movable platform or table that supports the paper stack and allows for precise positioning and alignment before entering the printing unit. It may have adjustable side guides and front stops to ensure accurate paper registration.
- Feed Rollers: Feed rollers are rubber-covered cylinders that grip and advance the paper from the stack onto the printing unit. They rotate in sync with the press’s operation, creating a controlled and consistent forward movement of the paper.
- Separation Mechanism: The separation mechanism is responsible for separating individual sheets from the paper stack to prevent multiple sheets from being fed simultaneously. It typically uses suction, air blasts, or friction to separate the top sheet from the stack.
- Paper Guides: Paper guides are adjustable components that help align the paper and maintain consistent lateral positioning as it moves through the feeding system. They ensure that the paper is fed straight and accurately registered with the printing unit.
- Paper Registration Sensors: Paper registration sensors detect the position and alignment of the paper as it enters the printing unit. They provide feedback to the control system, allowing for precise adjustment and synchronization of the printing process.
- Pneumatic or Vacuum Systems: In some paper feeding systems, pneumatic or vacuum systems are used to hold the paper