Stamp Die Assembly Keyed Protrusion Alignment

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Solution Overview

Problem

Conventional self-inking stamp die assemblies are difficult to assemble correctly due to reliance on mid-part engagement, leading to potential obliquity and interference with other device structures.

Innovation Solution

The stamp die assembly features a die bracket with elongated keyed protrusions near side edges and a replaceable stamp die with guiding channels, ensuring precise alignment and secure engagement through these features, allowing for easy assembly and fixing the relative position of the components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If mid-part engagement is used for assembly, then the assembly structure is simple, but the alignment precision is poor and obliquity occurs

Engineering Contradiction:

Improveassembly structureVSAvoidalignment precision

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The invention transitions from single-point mid-part engagement to multi-point distributed engagement by adding keyed protrusions at both side edges, creating a two-dimensional engagement pattern that improves alignment precision without significantly increasing structural complexity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The invention applies different engagement qualities to different locations: the mid-part engagement provides basic structural connection, while the side edge keyed protrusions provide precise alignment and rotational constraint, creating localized functional differentiation that solves the overall alignment problem

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If mid-part engagement only is used, then the assembly is easy to manufacture, but the operational reliability is poor due to obliquity and interference

Engineering Contradiction:

Improveassembly easeVSAvoidoperational reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention segments the engagement function into three independent engagement zones: mid-part engagement for basic connection, and two side edge keyed protrusions for alignment and rotational constraint. This segmentation allows each zone to perform its specific function, improving operational reliability while maintaining manufacturing simplicity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The keyed protrusions and guiding channels are pre-formed during manufacturing, establishing precise alignment geometry before assembly occurs. This preliminary action ensures that when components are assembled, the alignment is automatically correct, preventing obliquity and interference during operation

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS8230782B2Stamp die assembly for a self-inking stamping device

Publication Date: 2012.07.31 WARM SUN ENTERPRISES

AI summary

A stamp die assembly for a self-inking stamping device has a die bracket and a replaceable stamp die. The replaceable stamp die is mounted detachably on the die bracket via the engagement between the median tab of the replaceable stamp die and the transverse recess of the die bracket, and via the engagement between the side strips of the replaceable stamp die and the keyed recesses of the die bracket. The die bracket has two elongated keyed protrusions parallel with each other and near two side edges. The replaceable stamp die has two guiding channels engaging with the keyed protrusions. Therefore, the related position of the die bracket and the replaceable stamp die is fixed.