Image Recording Device with Size Detection for Double-Surface Positioning
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Solution Overview
Problem
Conventional image recording devices that record images on both surfaces of a moving recording medium face challenges in accurately positioning images when there is an error in the medium's conveyance length, leading to shifted images on the front and reverse surfaces.
Innovation Solution
An image recording device with a detection system that uses a scanner to measure the recording medium's size and adjust the image recording position on the reverse surface, combined with a switch back method for inversion, ensures accurate positioning of images on both surfaces even with length errors in conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a switch back type inversion part is used to invert the recording medium, then the device configuration becomes simple and the recording medium can be surely inverted, but the front end and back end of the recording medium are replaced by each other causing image position shift when there is an error in length in the direction of conveyance
Solution Approach 1:
The detection part detects the size of the recording medium before the inversion operation. The control part calculates the appropriate image recording position on the reverse surface based on the detected size, compensating for conveyance length errors before the actual recording occurs. This preliminary detection and calculation ensures accurate image positioning even when using a simple switch back type inversion part.
Solution Approach 2:
The detection part provides feedback information about the recording medium size to the control part. The control part uses this feedback to adjust and determine the correct image recording position on the reverse surface, creating a closed-loop control system that compensates for conveyance errors and maintains positioning accuracy.
2Ease of operation
If the front end and back end of the recording medium are replaced by each other during inversion, then the switch back method achieves simple inversion, but image positions on front and reverse surfaces become shifted due to conveyance length errors
Solution Approach 1:
Before the inversion operation is performed, the detection part measures the recording medium size and the control part calculates the compensated image recording position. This preliminary action ensures that even though the front and back ends are swapped during simple switch back inversion, the images will be correctly positioned on both surfaces.
Solution Approach 2:
The control part changes the image recording position parameter on the reverse surface based on the detected recording medium size. By adjusting this parameter according to the actual medium dimensions, the system compensates for conveyance length errors and maintains image position alignment despite the front-back end replacement during inversion.
3Productivity
If images are recorded on front and reverse surfaces of moving recording medium, then both surfaces can be printed, but conveyance length errors cause shifted images on the surfaces
Solution Approach 1:
The detection part detects the recording medium size before the recording process. The control part calculates the appropriate image recording position on the reverse surface based on this detected size, establishing correct positioning parameters before both surfaces are recorded. This preliminary detection ensures accurate image positioning on both surfaces despite conveyance length errors.
Solution Approach 2:
The detection part provides feedback on the recording medium size to the control part, which uses this information to determine the correct image recording position on the reverse surface. This feedback mechanism enables accurate positioning on both front and reverse surfaces by compensating for conveyance length errors through real-time size-based adjustment.
Data Source
AI summary
An image recording device that makes it possible to accurately position images on the front and reverse surfaces of a recording medium even when there is an error in length in the direction of conveyance of the recording medium. The image recording device is equipped with a paper supply part, a paper discharge part, a table movement mechanism, which moves ten tables disposed at regular intervals along a circulation path, an image recording part, which records an image on printing paper on top of the table that is moved by this table movement mechanism, an inversion part, which inverts the printing paper, and a transport mechanism, which transports the printing paper inverted by the inversion part to the paper supply part.