Splicing Device Threaded Spindle Servo Control
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Solution Overview
Problem
Existing splicing devices for butt-splicing sticky tapes, such as steel or textile cord tapes, face challenges in maintaining consistent splicing pressure due to variations in tape thickness and inaccuracies in drive motor movements, leading to inconsistent splice connections.
Innovation Solution
The implementation of a splicing device with two threaded spindle drives powered by servomotors for precise vertical movement of upper splicing bars, coupled with a piston-cylinder unit to maintain constant pressure, and a stop rod for emergency prevention of over-lowering, ensuring consistent splicing pressure regardless of tape thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard drive motors are used to move the upper splicing bars vertically, then the device structure remains simple, but the positioning precision and splicing pressure consistency deteriorate due to inaccuracies in motor movement and tape thickness variations
Solution Approach 1:
The patent replaces standard drive motors with a screw drive mechanism (leadscrew and nut combination) to achieve precise positioning of the upper splicing bars. The screw mechanism converts rotational motion into precise linear displacement, enabling accurate control of the splicing bar position and consistent application of splicing pressure despite variations in tape thickness.
2Adaptability or versatility
If the upper splicing bars are lowered to accommodate thinner tape sections, then thinner tapes can be spliced, but excessive pressure may be applied to thicker tape sections causing damage
Solution Approach 1:
The patent incorporates a limit stop that is预先 set to prevent the upper splicing bars from being lowered beyond a safe position. This preliminary protective measure ensures that even when attempting to splice thinner tape sections, the bars cannot be lowered so far as to apply excessive pressure to thicker tapes, thus preventing material damage while maintaining adaptability.
Solution Approach 2:
The limit stop provides a mechanical feedback mechanism that physically prevents over-lowering of the splicing bars. When the bars approach the maximum safe lowering position, the limit stop engages to stop further descent, providing immediate feedback to the operator and preventing harmful excessive pressure application.
3Adaptability or versatility
If the upper splicing bars are lowered to accommodate thicker tape sections, then thicker tapes can be spliced, but insufficient pressure will be applied to thinner tape sections resulting in poor splice quality
Solution Approach 1:
The patent employs a screw drive mechanism that allows dynamic adjustment of the upper splicing bar position. The threaded connection provides fine-adjustment capability, enabling the operator to precisely control the lowering distance to match the specific tape thickness being spliced, thereby maintaining optimal splicing pressure and reliable splice quality across varying tape thicknesses.
4Reliability
If the splicing pressure is increased to ensure good splice connections, then splice quality improves, but the risk of damaging thicker tape sections increases
Solution Approach 1:
The limit stop is预先 configured to establish a maximum safe lowering position for the upper splicing bars. This preliminary protective measure ensures that the splicing pressure never exceeds safe levels that could damage thicker tape sections, while still providing sufficient pressure for reliable splicing of thinner tapes within the safe pressure range.
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 allows for high-precision positioning and consistent splicing pressure, ensuring reproducible and reliable butt-splice connections by preventing excessive pressure increase and tilting, thus enhancing the quality of the splice.
Implementation Method 1
a piston-cylinder unit limiting the splicing pressure acting on the tape clamped in the splicing position between the upper and lower splicing bars being provided between the threaded nut and the splicing bar
Implementation Method 2
each threaded spindle drive having a threaded spindle driven by the servomotor, which is rotatably mounted on the lower splicing bar, and one on the threaded spindle running threaded nut coupled to the upper splicing bar
Data Source
Figure 1~2
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Figure 5
AI summary
Splicing device for butt splicing a sticky tape with two pairs of splice bars, each consisting of an upper splice bar and a lower splice bar, the splice strips having toothed strips, wherein the upper splice bars are movable vertically relative to the lower splice bars from a raised non-working position to a lowered splicing position via a first drive device, and wherein one pair of splice bars in the splicing position is movable horizontally relative to the other pair of splice bars via a second drive device with simultaneous engagement of the toothed strips facing each other, wherein the first drive device comprises two threaded spindle drives (18) with servo motors (23) for each pair of splice bars, wherein each threaded spindle drive (18) has a threaded spindle (19) driven by the servo motor (23), which is rotatably mounted on the lower splice bar (8, 9), and a threaded spindle (19) running on the threaded spindle and connected to the upper splice bar. (6,7) coupled threaded nut (20) comprising a piston-cylinder unit (24) between the threaded nut (20) and the splice bars (6, 7).