Feed Screw Convex Contact Structure for Nut Tilt Accuracy
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Solution Overview
Problem
In feed mechanisms with a nut and screw shaft, the inclination of the nut can cause feed irregularity and accuracy issues in the moving body, as the inclination is transmitted directly to the moving body when it is fixed to the nut.
Innovation Solution
The introduction of convex portions on the moving body or nut, allowing the nut to push the moving body only through these convex portions, which helps to absorb and suppress the influence of nut inclination, along with the use of elastic bodies and rotation-preventing shafts to stabilize the relative positions and maintain contact, thereby reducing feed irregularity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the moving body is fixed to the nut, then the structure is simple, but the inclination of the nut is transmitted to the moving body causing feed irregularity
Solution Approach 1:
The contact interface between the nut and moving body is segmented into multiple convex portions distributed around the screw shaft. This segmentation allows the moving body to be pushed at multiple discrete points rather than through a continuous fixed connection, enabling the moving body to accommodate nut inclination while maintaining positional accuracy.
Solution Approach 2:
The convex portions act as intermediary contact elements between the nut and moving body. Instead of a direct fixed connection, the convex portions mediate the force transmission, allowing the moving body to be pushed accurately while tolerating the inclination of the nut through the distributed contact points.
2Ease of manufacture
If the distance between the screw shaft surface and convex portion apex is large, then the structure is easier to manufacture, but the inclination of the nut can affect the moving body
Solution Approach 1:
The distance parameter between the screw shaft surface and convex portion apex is optimized to 5 mm or less. This parameter change ensures that the convex portions remain close enough to the screw shaft to minimize the influence of nut inclination on the moving body, while still being manufacturable with standard precision.
3Device complexity
If only one convex portion is used, then the structure is simpler, but the inclination of the nut around the connection line can affect the moving body
Solution Approach 1:
The contact interface is segmented into multiple convex portions distributed around the screw shaft. This segmentation allows the moving body to be pushed at multiple discrete points rather than through a continuous fixed connection, enabling the moving body to accommodate nut inclination while maintaining positional accuracy.
Solution Approach 2:
The convex portions are positioned asymmetrically around the screw shaft with their connecting line passing through the center. This asymmetric distribution optimizes the force transmission geometry to minimize the effect of nut inclination on the moving body's feed accuracy.
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 effectively suppresses feed irregularity caused by nut inclination, maintaining the accuracy of the moving body's position and reducing lateral irregularities during image scanning, while also minimizing the number of components and ensuring balanced elastic forces.
Implementation Method 1
an elastic body that makes an elastic force act in a direction where the nut and the moving body come into contact with each other at the convex portion
Data Source
AI summary
A feed mechanism, which is capable of suppressing feed irregularity caused by the inclination of a nut of a feed screw, is obtained. A feed mechanism (sub-scanning mechanism) includes a feed screw that includes a screw shaft and a nut and a moving body, and the nut is moved on the screw shaft by a rotation of the screw shaft, so that the moving body is moved in the direction of the screw shaft. The inclination of the moving body with respect to the nut is allowed in a case in which the moving body is moved by a movement of the nut.