Self-Inking Stamp Guide Pin Mechanism for Uniform Ink Uptake
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Solution Overview
Problem
Current self-inking stamps require significant effort to produce stamped imprints, are bulky due to multiple mechanical parts, and have issues with ink uptake and user comfort during pad changes, often resulting in uneven images and complicated handling.
Innovation Solution
A self-inking stamp design with a printing plate holder turned via two guide pins, allowing for compact pivoting and increased contact area usage, featuring a retaining device for lateral accessibility and easy pad replacement, reducing bulk and improving operational simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple guide pins and T-shaped guide slots are used to enable the printing plate holder to pivot from rest position to stamping position, then the stamping function is achieved, but the device becomes bulky and requires increased force due to frictional forces in the guide axes and pins
Solution Approach 1:
The patent removes the complex T-shaped guide slots and multiple guide pins from the mechanism. Instead, it uses a simplified single guide pin that moves along a guide slot in the lower part, eliminating unnecessary mechanical components while maintaining the pivoting function from rest position to stamping position.
Solution Approach 2:
The patent inverts the traditional approach by having the guide slot in the lower part and the guide pin in the printing plate holder, rather than having guide pins in both parts as in conventional designs. This inversion simplifies the mechanism and reduces frictional forces.
2Area of stationary object
If the printing plate holder is positioned at 90° to the contact area in rest position with multiple guides and mechanical parts, then the stamping mechanism functions, but the usable contact area is reduced and the overall size increases
Solution Approach 1:
The patent extracts and removes the unnecessary T-shaped guide slots and multiple guide pins, keeping only a single guide pin and a simplified guide slot. This reduction in mechanical parts increases the usable contact area while maintaining the 90° positioning in rest position.
3Ease of operation
If T-shaped guide slots are used to guide the printing plate holder movement, then the pivoting motion is enabled, but jamming may occur and smooth motion cannot be obtained
Solution Approach 1:
The patent completely removes the T-shaped guide slots that cause jamming issues. Instead, it uses a simple linear guide slot in the lower part that guides the single guide pin smoothly from the rest position to the stamping position, eliminating the risk of jamming.
4Manufacturing precision
If the stamp plate is not close to the ink-saturated stamp pad in rest position, then the turning mechanism has space to operate, but uneven ink uptake occurs producing uneven stamped image
Solution Approach 1:
The patent removes the complex turning mechanism with multiple pins and T-shaped slots that prevented the stamp plate from being close to the pad. The simplified single guide pin mechanism allows the stamp plate to be positioned immediately adjacent to the ink-saturated pad in rest position, ensuring uniform ink uptake.
Data Source
AI summary
The invention relates to a stamp comprising a telescoping upper and lower part as well as a printing plate holder pivotally disposed in the lower part to accommodate the stamp plate. A retaining device for a stamp pad is associated with the printing plate holder, and in a rest position the printing plate holder is positioned in the range 80° to 135°, preferably at approximately 90° with respect to a contact area. From this rest position the stamp can be displaced into an operating position to produce a stamped imprint via guide means, whereby the printing plate holder is turned about two guide pins, wherein one guide pin is respectively disposed on a side face of the printing plate holder, and the guide pins simultaneously engage in guide slots in the upper and lower part.