Dual Printing Units for Screen Mask Setup Parallelism
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Solution Overview
Problem
Existing screen printing apparatuses for printed circuit boards face reduced throughput due to the need for sequential replacement of screen masks and parameter data, particularly in small-volume diverse-component production, leading to inefficiencies in production lines.
Innovation Solution
A screen printing apparatus with two printing units, where one unit operates as a working system for printing while the other acts as a standby system for setup tasks, allowing parallel processing and improved efficiency by enabling simultaneous printing and setup operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single printing unit is used in a single-lane production line, then the device complexity is reduced, but the productivity deteriorates due to sequential replacement of screen masks and parameter data
Solution Approach 1:
The printing system is segmented into multiple independent printing units (first printing unit and second printing unit), each capable of independent operation. This allows the production line to be divided into parallel processing streams, enabling simultaneous printing operations and eliminating the bottleneck of sequential processing.
Solution Approach 2:
The standby printing unit is prepared in advance with pre-mounted screen masks and pre-loaded parameter data for the next process. This preliminary preparation allows the standby unit to immediately transition to active printing status without waiting for mask replacement or parameter reconfiguration, thereby maintaining continuous high-speed production.
2Loss of time
If screen masks and parameter data are replaced sequentially in a single printing unit, then the device complexity remains low, but the loss of time increases significantly
Solution Approach 1:
While one printing unit is actively printing, the other printing unit performs preliminary setup tasks including mounting the next screen mask and loading parameter data. This parallel preparation eliminates idle time during setup operations, as the active unit continues production while the standby unit readies for its turn.
Solution Approach 2:
The dual printing unit configuration ensures that at least one unit is always in a productive state. When one unit transitions from printing to setup, the other unit maintains continuous printing operation, eliminating interruptions in the production flow and ensuring uninterrupted useful action throughout the system.
3Productivity
If a single printing unit performs both printing and setup tasks sequentially, then the ease of operation is maintained, but the productivity deteriorates in small-volume diverse-component production
Solution Approach 1:
The operational workload is segmented between two printing units: one dedicated to active printing and the other to setup tasks. This division allows each unit to specialize in its respective function, improving overall efficiency without requiring complex coordination or control mechanisms.
Solution Approach 2:
The second printing unit serves as a copy or duplicate of the first, with identical functional capabilities. This redundancy allows the standby unit to be prepared in advance with different screen masks and parameters, enabling quick switching between product varieties without reconfiguring the active printing unit during operation.
Data Source
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AI summary
A screen printing apparatus in which two printing units (10A: 20A, 10B: 20B) are provided in a production line which transports boards from a single board exit position set on a downstream side in a conveyance direction, one printing unit (10B; 20B) being disposed is available for set-up tasks while the other printing unit (10A; 20A) is working. Since set-up tasks can be conducted in one printing unit (10B; 20B) while the other printing unit (10A; 20A) is working, then it is possible to improve through-put dramatically even in cases where small-volume diverse-component production is carried out in a single lane.