Printing Nest Belt Layout for Lower-Inertia Substrate Printing
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Solution Overview
Problem
Existing printing devices face limitations in operating speed due to high inertia of the printing nest, which is often addressed by reducing the weight of the nest but at the cost of increased material expenditure and additional downtime for maintenance.
Innovation Solution
The printing device reduces inertia by rearranging the transport rollers of the conveyor belt device, where the deflection surfaces on the printing nest are moved, and the supply and collecting rollers are kept stationary, allowing for easier redirection of the conveyor belt and minimizing wear, thus reducing the moving mass of the printing nest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the printing nest weight is reduced to decrease inertia, then the operating speed can be increased, but the material expenditure increases and robustness decreases
Solution Approach 1:
The conveyor belt system is segmented into stationary support rollers and movable deflection rollers. The heavy stationary components (support rollers) remain fixed to the device frame, while only the lighter deflection rollers move with the printing nest. This segmentation allows the printing nest to have reduced weight for faster operation while the stationary heavy components provide structural robustness.
Solution Approach 2:
Instead of making the entire printing nest lightweight, the invention inverts the approach by making the conveyor belt support structure stationary and heavy, while only the deflection elements are movable and lightweight. This reverses the conventional wisdom and achieves speed improvement without compromising overall system robustness.
2Ease of operation
If the supply roll and collecting roll are moved with the printing nest, then the conveyor belt can be easily fed, but the inertia of the printing nest increases significantly
Solution Approach 1:
The heavy supply roll and collecting roll are extracted from the movable printing nest and fixed to the stationary device frame. Only the essential deflection rollers remain attached to the printing nest. This extraction removes the major source of moving mass while preserving the conveyor belt feeding functionality through the stationary rollers.
Solution Approach 2:
The stationary supply and collecting rollers act as intermediaries between the movable printing nest and the fixed device frame. They mediate the conveyor belt feeding operation by providing a fixed pivot point, allowing the printing nest to move freely while maintaining proper belt tension and alignment.
3Loss of time
If larger conveyor belt supplies are used on the supply roll, then maintenance interventions can be minimized, but the weight of the printing nest increases
Solution Approach 1:
The supply roll with large conveyor belt supply is extracted from the printing nest and installed as a stationary component. This allows using large rolls that would be too heavy for the movable nest, thereby extending maintenance intervals without increasing the printing nest weight.
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
This configuration enhances the operating speed and throughput of the printing device by reducing the inertia of the printing nest, allowing for faster movement and substrate exchange without increasing material or maintenance costs.
Implementation Method 1
The conveyor belt is guided from the supply roll via one of the deflection surfaces onto the work surface to form a support surface for the substrates
Implementation Method 2
if the conveyor belt is designed to be permeable to air, so that a substrate on the print nest is sucked onto the work surface or the support surface of the conveyor belt by generating a negative pressure below the work surface through the work surface and the conveyor belt
Implementation Method 3
generating a negative pressure below the work surface through the work surface and the conveyor belt, and is locked in place
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a printing device (1) for printing substrates, such as printed circuit boards, wafers, or solar cells for example, comprising at least one movably mounted printing unit (3, 4) with a working surface (19) on which the substrate to be printed can be placed, wherein the printing unit (3, 4) is paired with a transport belt device (15, 14) which has a supply roller (16) with a transport belt (11, 12) wound thereon and a collection roller (17) for winding up the transport belt (11, 12), and two deflecting surfaces, in particular deflecting rollers (18, 20), which are paired with the working surface (19). The transport belt (11, 12) is guided by the supply roller (16) over one of the deflecting surfaces and onto the working surface (19) in order to form a contact surface for the substrates and by the working surface (19) over the other deflecting surface to the collection roller (17). The deflecting surfaces (18, 20) can be moved together with the respective printing unit (3, 4), and the supply roller (16) and the collection roller (17) are held on the printing device (1) in a stationary manner.