The stamping industry relies heavily on heavy-duty decoilers as the primary vertical decoiling equipment. These machines have largely replaced traditional decoilers due to their enhanced functionality and efficiency. Traditional decoilers, characterized by their simple structure of a metal rod and two supports, have become obsolete due to several drawbacks, including complex material replacement, cumbersome adjustments, and frequent issues with material deviation and scattering. Consequently, heavy-duty decoilers have become the preferred choice for many manufacturers.

The Evolution from Traditional to Heavy-Duty Decoilers

Traditional Decoilers were once the standard in the market. They featured a basic design with a metal rod running through the coil material, supported at both ends. While this method achieved basic decoiling and feeding functions, it was fraught with challenges. Material replacement was labor-intensive, adjustments were difficult, especially when leveling the material, and issues with material deviation and scattering were common. These limitations have led to the widespread adoption of heavy-duty decoilers, which offer a more efficient and reliable solution.

Automatic Start-Stop Operations in Heavy-Duty Decoilers

A common question among customers switching to heavy-duty decoilers is whether these machines can perform automatic start-stop operations. The answer is yes. Most heavy-duty decoilers on the market are powered models capable of automatic start-stop functionality during the decoiling process. To understand how this works, it is essential to grasp the basic structure of a heavy-duty decoiler.

Structure and Functionality of Heavy-Duty Decoilers

Heavy-duty decoilers consist of a motor and a reducer housed within the main body of the machine. The motor drives the main shaft of the decoiler through a chain mechanism, enabling the decoiling operation. An electric control box, located on the side of the machine, manages the motor’s operations and offers both manual and automatic control modes. In manual mode, the decoiler operates each time the button is pressed. In automatic mode, an induction circuit controls the start and stop functions.

Induction Circuit Control

The automatic operation of heavy-duty decoilers is primarily governed by an induction circuit. Each machine is equipped with an L-shaped induction rod (or a standing floor induction frame for wider materials) insulated from the decoiler body and connected to an intermediate relay in the control box. A transformer within the control box supplies 12V induction power to the system.

During operation, the decoiler continuously feeds the material, causing a downward sagging arc in the waiting area. When this arc reaches a specific point and contacts the induction rod or frame, the induction voltage on the material closes the circuit of the intermediate relay. After a brief delay, the time relay cuts off the motor switch, halting the motor and stopping the decoiling process.

Resuming Decoiling Operations

When the subsequent leveling machine continues to work, the material arc in the waiting area rises and leaves the induction rod or frame, prompting the intermediate relay circuit to switch. After another delay, the time relay reconnects the motor circuit, allowing the decoiler to resume operation. This cyclical process ensures continuous and automatic control of the decoiling operation.

Advantages of Heavy-Duty Decoilers

Heavy-duty decoilers offer several advantages over traditional models, including:

  • Improved Efficiency: Automated start-stop operations reduce manual intervention, increasing overall efficiency.
  • Enhanced Precision: Induction circuits and relays ensure precise control over the decoiling process.
  • Reduced Downtime: Automated systems minimize downtime caused by manual adjustments and material handling.
  • Better Material Handling: The design of heavy-duty decoilers accommodates a wide range of material widths and weights, making them versatile for various applications.


In summary, heavy-duty decoilers have revolutionized the stamping industry by providing a more efficient, reliable, and automated solution for decoiling and feeding materials. Their ability to perform automatic start-stop operations, coupled with their robust design and advanced control systems, make them indispensable in modern manufacturing processes. By understanding their structure and functionality, manufacturers can fully leverage the benefits of heavy-duty decoilers to enhance productivity and streamline operations.