Spring-Loaded Corrugated Stitcher Head for Heavy Stock
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Solution Overview
Problem
Existing stitching heads often deform the crown of a stitch when stitching heavy stock due to inadequate constrainment of stitching material, leading to buckling and undesirable stitches, and suffer from wear-related gaps that further exacerbate deformation.
Innovation Solution
A stitching head with a corrugated supporter surface and a corrugated driver surface that mesh together, tightly constraining the stitching material, along with a two-part supporter that can be easily replaced and spring-loaded to reduce gaps and compensate for wear, ensuring consistent constrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional smooth supporter surface and driver are used, then the device complexity is low, but the stitching material is not tightly constrained causing buckling and stitch deformation
Solution Approach 1:
The patent applies local quality by creating corrugated surfaces with ridges and grooves only in the specific regions where stitching material contact occurs. This localized corrugation provides enhanced constrainment precisely where needed, while maintaining simplicity in other areas of the driver and supporter components.
Solution Approach 2:
The corrugated surfaces feature curved ridges and grooves that conform to the shape of the stitching material. This curvature allows the driver and supporter to wrap around and tightly constrain the stitching material, preventing buckling while maintaining a relatively simple overall component geometry.
2Reliability
If a single-piece supporter is used, then the device complexity is low, but wear-related gaps cannot be compensated leading to continued stitch deformation
Solution Approach 1:
The supporter is divided into two separate pieces: a stationary supporter base and a movable supporter piece. This segmentation allows the movable piece to be spring-loaded, enabling it to move independently to compensate for wear and maintain consistent constrainment force on the stitching material throughout the stitching process.
Solution Approach 2:
The movable supporter piece is designed to dynamically adjust its position through spring loading. As wear occurs in the driver and supporter, the spring force causes the movable piece to shift, automatically compensating for the increased gaps and maintaining reliable constrainment of the stitching material.
3Manufacturing precision
If no spring loading is applied, then the device complexity is low, but gaps from wear accumulate causing stitch crown deformation
Solution Approach 1:
The spring loading mechanism provides beforehand cushioning by pre-loading the movable supporter piece with spring force. This spring force acts as a compensatory mechanism that anticipates and counteracts the effects of wear, maintaining consistent constrainment pressure on the stitching material before significant gap formation occurs.
Solution Approach 2:
The spring-loaded movable supporter piece provides self-service by automatically compensating for wear without requiring external adjustment or intervention. The spring force continuously pushes the movable piece to maintain optimal contact pressure, allowing the stitching head to self-correct for wear over time.
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
Prevents buckling of stitching material and maintains stitch integrity by tightly constraining the material between the driver and supporter, reducing deformation and accommodating wear, resulting in more reliable and consistent stitching.
Implementation Method 1
a spring for spring-loading the movable supporter piece away from the stationary supporter base
Implementation Method 2
a spring for spring-loading the movable supporter piece
Data Source
AI summary
A stitching head is provided for stitching books or printed products. The stitching head includes a supporter and a driver. The supporter has a corrugated supporter surface including first ridges and first grooves. The driver interacts with the supporter and has a channel and a corrugated driver surface which includes second ridges and second grooves. The first grooves and first ridges of the supporter mesh with the second ridges and second grooves of driver and the channel supports stitching material between the corrugated supporter surface and the corrugated driver surface. A method is also provided.