Numbering Unit Clamping Fixture for Tool-Free Precise Replacement
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Solution Overview
Problem
Existing numbering machines require significant setup time and risk of tool loss during replacement of numbering units due to screw connections, leading to excessive downtime and potential damage.
Innovation Solution
A clamping fixture is introduced between the upper and lower parts of the numbering device, allowing for tool-free and rapid interchangeability by using clamping levers and springs for secure attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw connections are used to attach the upper part to the lower part of the numbering device, then the connection is secure and reliable, but the replacement time increases significantly and tools are required
Solution Approach 1:
The connection system is segmented into modular components: a clamping lever with clamping arm, a separate clamping element with engagement geometry, and spring elements. This segmentation allows the upper part to be quickly attached and detached from the lower part without tools, while maintaining secure connection during operation. The clamping lever can be independently actuated to engage or disengage the clamping elements.
Solution Approach 2:
The connection system transitions from a static screw connection to a dynamic clamping mechanism. The clamping lever can be moved between engaged and disengaged positions, allowing rapid replacement of the upper part. During operation, the spring maintains constant clamping force, providing reliable connection without requiring tight fastening like screws.
2Reliability
If screw connections are used to fix the numbering units, then the attachment is secure, but the risk of tool loss and accidental damage increases
Solution Approach 1:
The clamping mechanism is designed to be tool-free and self-operating. The clamping lever can be directly actuated by hand to engage or disengage the clamping elements. The spring automatically maintains clamping force and can be compressed by hand to release the upper part, eliminating the need for external tools and the associated risks of tool loss or accidental damage.
3Manufacturing precision
If the entire numbering unit is replaced instead of just the upper part, then the positioning accuracy is maintained, but the replacement time becomes unacceptable
Solution Approach 1:
The numbering unit is divided into a stationary lower part that remains on the retaining ring and a removable upper part containing the type wheels. The lower part includes the clamping elements and engagement features that maintain positioning. When replacement is needed, only the upper part is detached and replaced, while the lower part with its precise positioning remains in place, ready to receive the new upper part.
Solution Approach 2:
The lower part is pre-positioned on the retaining ring with the clamping elements in ready position. The engagement geometry between the clamping elements and the upper part is pre-designed to automatically align when the upper part is attached. This preliminary preparation eliminates the need for realignment during replacement, allowing rapid exchange while maintaining positioning accuracy.
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
Enables fast, safe, and precise replacement of numbering units without realignment, reducing downtime and eliminating the need for tools.
Implementation Method 1
springs for secure attachment and detachment
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a clamping fixation of numbering units (1), in particular mechanical numbering units but also electromechanical numbering units (1). Specifically, the invention relates to a numbering unit (1) comprising an upper part (2) and a lower part (3), wherein a clamping fixation is provided between the upper part (2) and the lower part (3); to an upper part (2) and a lower part (3) for such a numbering unit (1); and to a numbering machine comprising such a numbering unit (1). The invention allows numbering units (1) to be replaced and positioned in a simple, reliable, error-free and exact manner. While replacing the upper part (2), the lower part (3), which is already correctly positioned, remains on the holding ring (4) of a numbering machine.