Reverse Type Stamp Ink Pad Sag Prevention
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Solution Overview
Problem
Quick-drying ink pads in reverse type stamps sag when contacting uneven stamp surfaces, leading to inconsistent ink adhesion and quality issues like imprint spots and blurs due to dimensional changes in molded articles, causing unnecessary increased transfer loads.
Innovation Solution
A reverse type stamp design featuring a movable container with an elastic support system, using a coil spring to maintain ink pad contact and an O-ring for air-tightness, with a tapered sealed surface to reduce the required sealing force, preventing sagging and ensuring consistent ink adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a highly repellent spring is used to ensure air-tightness of the ink pad, then air-tightness is improved, but the ink pad may be sagged due to excessive elastic force
Solution Approach 1:
The patent changes the parameter of elastic force by using a weakly repellent spring instead of a highly repellent one, reducing the elastic force to prevent ink pad sagging while maintaining sufficient air-tightness. This parameter adjustment resolves the contradiction between reliability (air-tightness) and shape (ink pad flatness).
2Ease of operation
If a stamp surface with unevenness contacts the ink pad for a long period, then imprinting operation is enabled, but the transfer load is unnecessarily increased causing quality deterioration
Solution Approach 1:
The patent reduces the transfer load parameter by using a weakly repellent spring that applies minimal elastic force. This allows the stamp surface with unevenness to contact the ink pad for imprinting operations while preventing unnecessary increase in transfer load, thus avoiding quality deterioration such as imprint blur.
3Productivity
If the ink pad is sagged due to contact with uneven stamp surface, then ink transfer is enabled, but ink adhesion becomes inconsistent causing imprint spots
Solution Approach 1:
The patent maintains consistent ink adhesion by reducing the elastic force parameter of the spring. The weakly repellent spring prevents excessive pressure that would cause ink pad sagging, thereby ensuring uniform ink transfer and consistent ink adhesion across the stamp surface, eliminating imprint spots while maintaining productivity.
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
The design effectively prevents ink pad sagging and unnecessary transfer loads, maintaining air-tightness with reduced operational force, thus preventing imprint quality issues like spots and blurs while ensuring efficient ink transfer.
Implementation Method 1
an urging means, which applies an elastic force to a surface of the movable container opposite to a stamp surface of the print body
Implementation Method 2
a sealing member provided for air-tightness of the accommodation space blocked by the print body
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
[Object] To provide a reverse type stamp capable of preventing a pad from being sagged while ensuring the airtightness of an ink pad. [Solving Means] A reverse type stamp (10) includes an outer cylindrical body (30), an inner cylindrical body (20) which is movable relative to the outer cylindrical body, an elastic member (60) that constantly urges the inner cylindrical body in a protruding direction inside the outer cylindrical body, an inversion body (40) which is reversed and returned in synchronization with the relative movement, and a print body (41) which is joined to the inversion body. When the outer cylindrical body is pressed down while the inner cylindrical body stands on a paper surface, the inversion body is reversed inside the inner cylindrical body for an imprinting operation. . the inner cylindrical body (20) has an ink cartridge (50) therein, and wherein an inner portion of the ink cartridge (50) is sealed by a sealing member (43) provided at the inversion body (40) and a sealed surface (51a) of the ink cartridge (50) receiving the sealing member (43) is formed in a tapered shape. An ink pad (52) may be provided inside a movable container (53) inside a cartridge (50). The movable container is elastically supported inside the cartridge by a coil spring (54) provided at a rear surface thereof. Since a contact between the ink pad and the print body is buffered, the sagging of the ink pad can be prevented.