The Tension Controller Is Basically Divided Into Three Categories

The tension control of the tension controller refers to the ability to permanently control the tension of the tape as it is transported on the device.

This control must be effective for any speed of the machine, including acceleration, deceleration and constant speed of the machine. Even in the case of an emergency stop, it has the ability to ensure that the tape does not break. The tension controller is basically divided into three categories: manual tension controller, pulse taper tension controller and fully automatic tension controller.

Manual tension controller
That is, during the winding or unwinding process, when the winding diameter changes to a certain stage, the operator adjusts the manual power supply device to achieve the purpose of controlling the tension. However, the modern gravure press manual tension control system has been basically eliminated, and only exists as a mode of operation in the closed-loop automatic tension control system.

Pulse taper tension controller
The tension control method of the pulse taper tension controller is to detect the number of running pulses of the winding or unwinding through the Hall switch.

When the pulse count reaches the preset pulse of the control controller, the tension output is incremented or decremented by one unit, thereby controlling the taper tension of the unwinding or unwinding. The main circuit of the tension controller replaces the conventional bulky transformer with a PWM constant current switch, so it has the characteristics of light weight, small volume, high constant current precision, etc. The controller operation panel adopts a micro-touch switch to make the operation simple and the output current is adopted. The LED digital tube makes the display more intuitive. The product can be set to manual tension control, winding taper tension control, unwinding taper tension control mode, and can be applied to various printing machines for winding and unwinding semi-automatic tension control.

Fully automatic tension controller
The automatic tension control is to directly measure the actual tension value of the tape by the tension sensor.

Then, the tension data is converted into a tension signal and fed back to the tension controller. The signal is compared with the preset tension value of the controller to calculate the control signal, and the automatic control execution unit makes the actual tension value equal to the preset tension value. To achieve the purpose of tension stability. It is currently a more advanced method of tension control. In addition, in the medium and high-grade printing press tension control system manufactured and sold in China, the higher printing speed and production process put forward higher requirements for tension control, making the magnetic powder clutch unable to perform the execution unit of such system. Therefore, it has been replaced by AC and DC servo motor execution units in modern gravure printing machines, high-speed slitting machines and high-speed coating laminating machines, achieving more advanced tension servo control.