Restricted by the technical level of the domestic machinery manufacturing industry, many parts of the Die Cutting Machine are rough processed. For example, the matching and manufacturing accuracy between the intermittent mechanism and the main drive system and the chain directly affect the machine speed. If the assembly accuracy is poor, it will affect the die-cutting accuracy and cause noise. Another example is the unreasonable determination of the gap between the toggle lever pressure mechanism and the moving platform, which will cause vibration and affect speed and accuracy.
Flat-bed die-cutting machines mostly use equal indexing cam mechanisms. Whether the shape of the cam is reasonable is the key. The tightness of the chain should be moderate, too tight or too loose will affect the accuracy of die cutting. The paper feed teeth of the flat die-cutting machine are mostly solid, but they are still easy to deform during high-speed movement, and the inertia is large when they stop suddenly. A good tooth row has high hardness and light weight, with moderate angle and pressure.
Die Cutting Machine
The main drive of the current Automatic Die Cutting Machine is driven by a worm and a worm wheel by a motor. Worm gears are mostly helical gears. It should be noted that when the worm gear and the worm are meshed at the index circle, whether the backlash between the gear teeth is appropriate. If the backlash is too large, the worm gear transmission is not stable; if the backlash is too small, it is not conducive to the flow of lubricant. In addition, the unreasonable pressure angle will affect the smoothness of the transmission.
These three items are the basic parts of die-cutting, and their quality is directly related to the quality of die-cutting. The plate material requires uniform density, light weight, high hardness, good flexibility, easy processing, flatness, and firmness. The knife line is stable after being embedded and can be replaced many times. The knife edge should be sharp, the height error of the whole knife and the bend of the big knife should be small. The hardness of the rubber strip should be moderate, not to squeeze the knife edge, and not to have insufficient resilience.
At present, the commonly used method is continuous paper feeding, that is, there is always a part of the front sheet and the back sheet overlapping. This method is stable and fast, but the rapid movement makes the paper have a great impact on the positioning front rule, and the paper curls or bounces after being stressed, causing inaccurate positioning. The ideal die-cutting machine should ensure the die-cutting speed while keeping the speed of the paper on the paper feeding table as low as possible.
The guide rail plays a role in positioning and controlling the direction of the chain. The thickness of the guide rail should be appropriate to be able to be embedded in the chain. The distance between the upper and lower guide rails must ensure that the chain passes smoothly. Too small increases transmission resistance; too large a chain is easy to jump. The track of the guide rail and the length of the chain also have a certain influence on the performance of the machine.
The most important device of the Front-Edge Die Cutting Machine is the pressure mechanism. At present, the most common double toggle mechanism, the crank rotates once, which enables the movable platform to reach the highest limit position twice. In order to ensure the quality of die-cutting, the entire platform should be evenly stressed during pressurization. Therefore, the working surfaces of the upper and lower platforms must be parallel. If the design is unreasonable, it will cause uneven pressure and excessive idle stroke.