Strapping Unit with Interlocking and Security Incisions
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Solution Overview
Problem
Existing strapping units fail to securely lock overlapping metal strap portions in both directions under tensile force, leading to potential release when tension is released.
Innovation Solution
A strapping unit with moveable main and auxiliary jaws, and punch members that form interlocking incisions in a metal strap loop, along with security incisions to prevent joint breakage, utilizing a housing with actuators and link mechanisms for compact design and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single set of main jaws and main punch members is used to form interlocking incisions, then the device complexity is reduced, but the reliability of the sealless joint is insufficient because the joint can be broken when tensile force is released
Solution Approach 1:
The strapping unit is divided into two independent functional systems: a main punching system with main jaws and main punch members that form interlocking incisions, and a security punching system with auxiliary jaws and security punch members that form security incisions. This segmentation allows each system to perform its specific function independently, ensuring both joint formation and joint security without requiring one system to compromise the other.
Solution Approach 2:
The main punching operation is performed first to create the primary interlocking joint structure. Subsequently, the security punching operation is performed to create additional security incisions that prevent joint breakage. This preliminary action sequence ensures that the joint is formed before additional security measures are applied, optimizing the overall reliability.
2Ease of operation
If auxiliary jaws are made moveable relative to main jaws, then the ease of operation is improved for positioning, but the device complexity increases due to additional actuation mechanisms
Solution Approach 1:
The auxiliary jaws are designed to perform multiple functions: they can be moved independently for precise positioning during security punching operations, and they can remain stationary to provide stable support during main punching operations. This multi-functionality allows a single component to serve both positioning and support roles, reducing the need for entirely separate mechanisms.
Solution Approach 2:
The auxiliary jaws are designed with moveable mounting relative to the main jaws, allowing their position to be dynamically adjusted based on operational requirements. During security punching, they move to optimal positions; during main punching, they maintain stable positions. This dynamic adaptability optimizes performance across different operational phases without requiring completely separate fixed structures.
Data Source
Figure 1~2
Figure 3a~3c
Figure 4a~4c
AI summary
A strapping unit (1) comprising main punch members (11a, 11b), a security punch member (21), main die members (31a-d) forming a first and a second main jaw and security die members (41a, 41b) forming a first and a second auxiliary jaw. The punch members are displaceable to and fro between a retracted position and an advanced punching position. The jaws are moveable towards and away from each other between a retracted open position and an advanced active position, and the auxiliary jaws are moveable in relation to the main jaws. The main die members and the main punch members are arranged to co-operate so as to cut mutually interlocking incisions in overlapping portions at the ends of a loop of metal strap received in the strapping unit. The security die members and the security punch member are arranged to co-operate so as to cut security incisions in said overlapping metal strap portions.