Roll Paper Steering Device Meandering Correction
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Solution Overview
Problem
Existing roll paper steering devices face accuracy issues in correcting meandering due to deformation of the roll shaft caused by the weight of the roll paper, leading to deviations in the parallel alignment of the external screw and linear guide rail, which impairs the precision of meandering correction.
Innovation Solution
A roll paper steering device with a linear guide rail fixed to a main body frame, a holding shaft fixing member that can swing vertically, a motor-driven external thread, and adjustment units to align the roll shaft and external thread parallel to the guide rail, ensuring precise mounting and correction of meandering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the roll paper holding unit is slightly inclined and mounted to offset roll shaft deformation, then the roll shaft horizontal accuracy is improved, but the external screw deviates from the linear guide rail direction causing reduced meandering correction accuracy
Solution Approach 1:
The movable member is made adjustable in position along the holding shaft fixing member, transforming a static mounting system into a dynamic one that can adapt to alignment requirements. This allows the external thread to be repositioned so its axis becomes parallel to the linear guide rail, resolving the contradiction between roll shaft accuracy and meandering correction precision
Solution Approach 2:
The position parameter of the movable member is changed through adjustment, allowing the external thread's orientation to be modified. By adjusting the mounting position, the system changes the geometric parameters to achieve parallel alignment between the external thread axis and linear guide rail, simultaneously satisfying both accuracy requirements
2Weight of moving object
If the roll shaft is used to support heavy roll paper, then the roll paper holding capacity is sufficient, but the roll shaft deforms downward causing impairment of horizontal accuracy
Solution Approach 1:
The roll shaft is pre-inclined during mounting so that the tip is positioned upward before the heavy roll paper is installed. This preliminary action counteracts the expected downward deformation, ensuring that when the roll paper is mounted, the roll shaft remains horizontally accurate despite the heavy load
Data Source
AI summary
A roll paper steering device includes a guide rail fixed to a main body frame, a guide engaged with the guide rail, a holding shaft fixing member supported by the guide rail via the guide, a roll paper holding unit including a roll shaft and mounted to the holding shaft fixing member, a movable member configured to adjustably mount to the holding shaft fixing member, a nut member that includes an internal thread portion that screws into the external thread portion and that is fixed to the main body frame in a posture where the axis of the external thread portion is parallel with the guide rail, a first adjustment unit configured to adjust the posture of the holding shaft fixing member, and a second adjustment unit configured to adjust the position at which the movable member.