Stamp Pad Unit With Retaining Projections
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Solution Overview
Problem
Existing stamp pad units for self-inking stamps often suffer from uneven ink distribution and adhesive-related hardening, which impair the quality of stamp imprints, especially when the ink pads are unused or rotated for continued use.
Innovation Solution
A stamp pad unit with two separate frame parts that securely hold ink pads without adhesives, using inwardly directed retaining projections to maintain even ink distribution and prevent adhesive penetration, ensuring consistent elastic properties and high-quality imprints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ink pads are glued to the frame or separating plate, then the ink pads are securely fixed within the frame, but unevennesses occur on the ink pad surface which impairs the quality of stamp imprints
Solution Approach 1:
The harmful element (adhesive) is completely removed from the system. Instead of gluing ink pads to the frame or separating plate, the patent uses a retaining structure where the ink pads are held in place by a recess in the frame that accommodates the ink pad thickness, eliminating adhesive-related surface unevenness while maintaining secure fixation
Solution Approach 2:
The frame is designed as a disposable component that is replaced together with the ink pads when they are consumed. This eliminates the need for complex retention mechanisms and allows simple geometric retention features to be used without concern for long-term durability, resolving the contradiction between simple retention and surface quality
2Stability of the object's composition
If ink pads are glued to secure them in the frame, then the ink pads remain in position during use, but adhesive hardening occurs which impairs ink pad elasticity and imprint quality
Solution Approach 1:
The adhesive is completely removed from the system. The ink pads are retained solely by the geometric recess in the frame that matches the ink pad thickness, preventing any adhesive penetration that would harden the ink pad material and impair its elasticity while maintaining position stability during stamping operations
Solution Approach 2:
The ink pads themselves serve as flexible retaining elements, with their thickness defining the retention depth in the frame recess. This allows the ink pads to maintain their natural elasticity and flexibility while being securely held in position, eliminating the need for rigid adhesive bonding
3Device complexity
If a single ink pad is used in the stamp, then the stamp structure is simpler, but when the ink is used up, significant time is required to replace or refill the ink pad
Solution Approach 1:
The stamp pad unit is segmented into two separate ink pads arranged side-by-side within a single frame, separated by a dividing wall. This allows one ink pad to serve as a backup while the other is in use, enabling immediate replacement by simply rotating the unit 180 degrees when one ink pad is depleted, thereby eliminating replacement time while maintaining relatively simple overall structure
Solution Approach 2:
A second ink pad is pre-installed in the frame alongside the first ink pad, separated by a dividing wall. This preliminary preparation allows instant continuation of stamping operations by rotating the unit to use the pre-positioned second ink pad, eliminating the time required to source and install a replacement ink pad
Data Source
AI summary
There is disclosed a stamp pad unit (1), in particular for a self-inking stamp, which comprises two ink pads (2a, 2b) being arranged within a frame (3), abutting against opposing surfaces (4a, 4b) of a separating plate (5) and being separated thereby from each other, wherein the frame (3) consists of two separate frame parts (3a, 3b) which are connected with each other and within which the ink pads (2a, 2b) are accommodated, wherein at least one frame part (3a, 3b), preferably each of the frame parts (3a, 3b), comprises at least one inwardly directed retaining projection (6a, 6b) engaged with an ink pad (2a, 2b) for holding the ink pad (2a, 2b).