Hot Stamping Machine Ribbon Tension Control
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Solution Overview
Problem
Existing hot stamping machines face challenges in maintaining consistent ribbon tension, especially with small widths, leading to marking defects and ribbon rupture due to high or low speed issues, particularly when marking individual parts at high rates.
Innovation Solution
A hot stamping machine design incorporating a suction box and a braking surface with adjustable suction orifices, combined with motorized unwinding and rewinding mechanisms, ensures a consistent ribbon tension by maintaining a low tension reserve in the suction box and modulating suction force to prevent jerky movements and inertia-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant tension device such as a spring-loaded beater arm is used to maintain ribbon tension, then the ribbon tension is maintained, but the device generates inertia that causes jerky advance of the ribbon and variation in tape tension at high marking rates
Solution Approach 1:
The patent uses a suction box with adjustable suction force to replace the mechanical constant tension device (beater arm). The suction box creates negative pressure that holds the ribbon in place without mechanical contact, eliminating inertia-related jerky movements while maintaining consistent tension even at high marking rates.
Solution Approach 2:
The invention replaces the mechanical spring-loaded beater arm system with a pneumatic suction system. This substitution eliminates the mechanical inertia problem while achieving the same tension maintenance function, allowing high-speed operation without ribbon position variation.
2Stability of the object's composition
If the ribbon is stretched tightly between the constant tension device and the rewinding means, then the ribbon position is stable, but the deformation stresses during rewinding degrade the tape at small widths and high marking rates
Solution Approach 1:
The suction box uses pneumatic pressure to hold the ribbon in position during marking, then releases the suction during rewinding. This allows the ribbon to be held stable when needed without maintaining continuous high tension, preventing degradation from deformation stresses during the rewinding phase.
3Speed
If a motorized rotating cylinder is used to control ribbon speed, then the running speed can be adjusted, but the rapid acceleration from zero speed causes either ribbon accumulation and marking defects or ribbon rupture
Solution Approach 1:
The suction box provides immediate pneumatic holding of the ribbon at the marking position without requiring mechanical acceleration. The suction force can be activated instantly when a part arrives, eliminating the acceleration phase that causes ribbon accumulation or rupture, while maintaining consistent marking quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables reliable and high-quality marking for small ribbon widths and high marking rates, preventing defects and ensuring consistent ribbon tension without introducing undesirable inertial effects, thus improving the overall marking process.
Implementation Method 1
a ribbon suction box and a ribbon braking surface, the braking surface having a fixed orientation with respect to the frame of the machine during each marking sequence, the ribbon coming from the means of unwinding passing successively in the suction box
Data Source
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AI summary
This hot-marking machine (1) comprises a marking member (6) intended to press a tape (7) against the peripheral surface (2A) of individual parts (2) in order to mark them, said individual parts (2) being positioned in succession in a marking station and being marked by the repetition of a marking sequence for each part. The machine (1) comprises means (12-14) for unwinding the tape, intended to unwind a length of tape (7) sequentially at the end of each marking sequence, for the next marking sequence, and means (15-17) for rewinding the tape. The machine (1) further includes a tape suction box (18) and a tape braking surface (19A), the braking surface (19A) being of fixed orientation relative to the frame (3) of the machine (1) during each marking sequence, the tape (7) output by the unwinding means (12-14) passing in succession through the suction box (18), along the braking surface (19A) and facing the marking member (6), in such a way that a reserve of tape (7) is available in the suction box (18) between the unwinding means (12-14) and the braking surface (19A), while the tape (7) is tensioned, facing the marking member (6), between the braking surface (19A) and the rewinding means (15-17).