Stencil Printing Duplex Image Positioning Control
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Solution Overview
Problem
Existing stencil printing apparatuses require cumbersome and error-prone adjustments to position front and rear surface images on a sheet for duplex printing, as they need to move in opposite directions during the sheet conveyance process.
Innovation Solution
A stencil printing apparatus with integrated sheet re-feeding means and a control system that allows the front and rear surface images to be moved together in the same direction, using a printing unit with a freely contactable and separable press roller and a sheet re-feeding mechanism, enabling synchronized image positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If individual position adjustment is performed for front surface image and rear surface image, then positioning flexibility is improved, but operation complexity and error probability increase
Solution Approach 1:
The patent combines the position adjustment operations for front surface image and rear surface image into a single unified operation. By merging the adjustment mechanisms, the operator can simultaneously adjust both image positions in the same direction, reducing operational steps and minimizing errors while maintaining positioning flexibility.
Solution Approach 2:
The patent creates a universal adjustment mechanism that handles both front surface and rear surface image positioning through a single control interface. This multi-functional adjustment system allows the operator to adjust both images together, eliminating the need for separate adjustment procedures and simplifying the overall operation.
2Productivity
If sheet is re-fed for duplex printing, then paper utilization is improved, but image position alignment becomes more difficult
Solution Approach 1:
The patent merges the position adjustment controls for front and rear surface images into a unified system. This allows simultaneous adjustment of both images in the same direction, making it easier to achieve proper alignment after sheet re-feeding for duplex printing, thereby maintaining high paper utilization while simplifying the alignment process.
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 solution simplifies the adjustment of image positions, reduces the likelihood of setting errors, and enhances operational efficiency by allowing both images to be moved in the same direction, improving workability and reducing mistakes.
Implementation Method 1
a thermal head having a plurality of minute heat-generating elements is brought into contact with a master formed by adhering together a thermoplastic resin film and a porous support, and while pulse-form electrification is applied to the heat-generating elements, the master is conveyed by conveyance means such as a platen roller, whereby a perforated image based on image information is engraved by heat-melt punching on the thermoplastic resin film of the master
Implementation Method 2
by pressing a sheet of paper against the outer peripheral surface of the printing cylinder using pressing means such as a press roller, ink supplied to the inner peripheral surface of the printing cylinder seeps through open hole portions in the printing cylinder and the perforated portions of the master so as to be transferred onto the sheet, whereby a printed image is formed on the sheet
Data Source
AI summary
In a stencil printing apparatus capable of duplex printing, in which a front surface printing process for printing a front surface image on one surface of a sheet of paper fed by a sheet feeding unit is performed, the sheet is re-fed to a sheet re-feeder, and then a rear surface printing process for printing a rear surface image on the other surface is performed. The positions of the front surface image and rear surface image to be formed on the sheet can be moved together by a predetermined amount in a single direction side of a sheet conveyance direction.