Interfolding Machine Transfer Unit Pneumatic Assistance
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Solution Overview
Problem
Conventional transfer units in interfolding machines face challenges in achieving high working speeds without heavy, complex, and expensive structures, as the side introduction movement of separation members requires high speeds, which is difficult to achieve due to inertia, leading to a need to reduce machine speed to facilitate separation.
Innovation Solution
A transfer unit with a simple and low-cost structure that uses pneumatic actuators to assist electric actuators during the side introduction movement, reducing inertia and allowing high-speed operation without the need for powerful actuators, featuring a support and handling assembly with electric motors and pneumatic actuators that synchronize movements to enable efficient separation of sheet bundles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional transfer units use heavy and complex structures to achieve high-speed side introduction movement of separation members, then the required high speed is achieved, but the device complexity and cost increase significantly
Solution Approach 1:
The patent applies dynamics by making the separation members movable rather than fixed, allowing them to be introduced into the sheet stack only when needed. The support surface is configured to receive separation members in a movable manner, enabling dynamic adjustment of the separation members' positions and orientations during operation, which allows high-speed operation without requiring overly robust fixed structures
Solution Approach 2:
The patent employs pneumatic actuators to move the separation members into and out of the sheet stack. The pneumatic system provides the necessary force for high-speed side introduction movement without requiring heavy mechanical structures, as pneumatic actuation can quickly accelerate and decelerate the separation members, reducing the need for massive components to handle inertial loads
2Device complexity
If conventional transfer units reduce machine speed to facilitate separation member movement, then the separation can be performed with simpler structures, but the productivity decreases
Solution Approach 1:
The patent implements periodic action by cyclically introducing and retracting the separation members into the sheet stack. The support surface moves the separation members into the stack at specific intervals when sheets need separation, then retracts them for the next cycle. This periodic motion allows the use of lighter structures that can operate at high speeds, as the separation members are in motion only during brief intervals rather than continuously
Solution Approach 2:
The dynamic configuration allows the separation members to be introduced and retracted quickly during operation. The support surface is designed to enable rapid movement of separation members, and the system coordinates this movement with the sheet feeding rate, allowing the machine to maintain high productivity while using simpler, lighter separation mechanisms
3Speed
If powerful actuators are used to achieve high-speed side introduction movement, then the required speed is achieved, but the device complexity and cost increase
Solution Approach 1:
The patent uses pneumatic actuators instead of powerful electric motors or hydraulic systems. Pneumatic actuators can deliver high acceleration and speed with relatively low power consumption and simpler construction. The compressed air system provides the necessary force to quickly introduce separation members into the sheet stack without requiring heavy-duty actuators
Solution Approach 2:
The patent employs air cushions and pneumatic support surfaces that provide upward force to counteract the weight and inertial forces of the separation members during high-speed movement. This counterbalancing effect reduces the net force required from the actuators, allowing high-speed operation with less powerful actuation systems
Data Source
Figure 1~2
Figure 3~5
AI summary
A transfer unit (100) in an interfolding machine comprises at least a first plurality of separation members (120) carried by a support and handling assembly (130) which moves the above said separation members (120) along a work path (60) comprising a side introduction movement (61) by appropriate constraint members (140, 150, 160) and actuators which comprise electric motors (143, 152, 163) suitable to determine the displacement of the separation members (120) throughout their work path (60) and pneumatic actuators (144, 153, 164) which are of aid to the electric motors (143, 152, 163) exclusively during the side introduction movement (61) which must be performed with very high accelerations and speeds.