Moveable Tray for Flatbed Printer Media Loading
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Solution Overview
Problem
In large format flatbed printers, operators can only load one row of print media sheets at a time due to safety constraints, limiting throughput and requiring manual handling under a cover, which restricts access to the loader.
Innovation Solution
A moveable tray that can be positioned between an accessible state for the operator and an inaccessible state for the loader, allowing multiple rows of sheets to be loaded without the operator needing to reach under the cover, using suction cups and safety covers to maintain safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator manually places sheets under the cover through the opening, then operator safety is maintained, but only one row of sheets can be loaded at a time and throughput is limited
Solution Approach 1:
A moveable tray is introduced as an intermediary device between the operator and the loader. The tray can be positioned in an accessible state for the operator to load multiple rows of sheets, then moved to an inaccessible state for the loader to pick up sheets. This mediator allows multiple sheets to be loaded at once while maintaining safety by preventing direct operator access to the loader's area.
Solution Approach 2:
The tray is made dynamic and moveable between two positions: an accessible position where the operator can load sheets, and an inaccessible position where the loader operates. This dynamic repositioning allows the system to switch between safety-oriented operation and productivity-oriented operation, resolving the contradiction between safety and throughput.
2Reliability
If the loader is enclosed by a cover with only a low opening, then operator safety is improved, but access to the loader is restricted and loading efficiency decreases
Solution Approach 1:
The moveable tray serves as a mediator that extends the operator's reach without requiring direct access to the loader's area. The operator loads sheets onto the tray from a safe position, then the tray is moved to the loader's area for sheet pickup. This eliminates the need for the operator to reach under the cover while still enabling efficient loading.
Solution Approach 2:
Instead of providing horizontal access to the loader through the low opening, the system uses a moveable tray that can be positioned at different depths. This adds a dimensional aspect to the loading process, allowing sheets to be loaded at various depths on the tray without requiring operator access to the loader's immediate area.
3Reliability
If only one row of sheets is loaded at a time, then safety constraints are satisfied, but productivity and throughput are reduced
Solution Approach 1:
The moveable tray acts as a buffer that can hold multiple rows of sheets simultaneously. The operator loads multiple rows onto the tray in one operation, then the tray is moved to the loader for sequential pickup. This intermediary buffer allows batch loading while maintaining safe operational distances.
Solution Approach 2:
The operator performs preliminary loading of multiple sheets onto the tray before the loader begins its picking operation. This preliminary action prepares multiple rows of sheets in advance, allowing the loader to pick them up sequentially without waiting for individual sheet placement, thereby increasing throughput while maintaining safety.
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 enables the simultaneous loading and printing of multiple rows of sheets, improving throughput while maintaining operator safety by allowing sheets to be loaded at various depths without manual intervention in the loader's area.
Implementation Method 1
suitable loaders, for example having vacuum cups, may be provided to pick up media sheets from a loading top or surface
Data Source
AI summary
Printing apparatus comprise a printing table, a loader to load sheets of print media to the printing table, and a moveable tray on which at least one row of media sheets can be placed, the tray being moveable between a position in which it is accessible to an operator for placing media sheets thereon and another position in which at least part of the tray is accessible to the loader for picking the print media sheets but inaccessible to the operator.