Gripper Shaft Holder Locking for Fast Sewing Pattern Changes
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Solution Overview
Problem
Multi-needle sewing machines face significant challenges in quickly and accurately changing sewing patterns due to complex screw connections and limited access, requiring extensive time and tools for needle and gripper adjustments, leading to surface wear and potential damage.
Innovation Solution
A device utilizing a toggle screw or locking mechanism with a positive connection between the support element and gripper shaft, allowing for easy detachment and secure attachment of grippers, along with adjustable features like an eccentric and spring elements for precise alignment without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a locking clip is used to attach gripper holders to the gripper shaft, then quick attachment is achieved, but high clamping force causes surface wear of the gripper shaft
Solution Approach 1:
The patent introduces a holder as an intermediary component between the gripper shaft and the gripper. The holder is detachably connectable to the gripper shaft and has a recess that receives the gripper, eliminating direct contact between the locking clip and the gripper shaft. This mediator approach allows quick attachment while preventing surface wear on the shaft.
Solution Approach 2:
The attachment system is segmented into separate functional components: the gripper shaft, the holder (with detachable connection), and the gripper (with locking clip). This segmentation isolates the wear-inducing locking mechanism from the shaft, concentrating wear on the holder instead, which can be easily replaced.
2Reliability
If screw connections are used to attach needles and grippers, then secure attachment is achieved, but complex structure and tool requirements increase time and effort for pattern changes
Solution Approach 1:
The patent extracts the complex screw connection mechanism and replaces it with a simpler detachable holder system. The holder can be quickly attached and detached from the gripper shaft without tools, while still providing secure attachment for the gripper through the locking clip mechanism integrated into the holder rather than the shaft itself.
3Manufacturing precision
If gripper holders are loosened for adjustment, then positioning accuracy can be improved, but the process becomes time-consuming and error-prone
Solution Approach 1:
The holder is pre-configured with a recess that guides the gripper into the correct position during attachment. This preliminary positioning structure ensures accurate alignment without requiring time-consuming manual adjustment after attachment, reducing both time and potential for error.
Data Source
AI summary
A device for fastening a gripper on a gripper shaft of a textile machine, in particular a sewing machine, preferably a multi-needle sewing machine, with a support element for the gripper is described. The support element for the gripper is connected to a holder or the gripper shaft via a connecting element in such a way that the support element for the gripper is detachable from the holder or the gripper shaft. The connecting element is designed as a toggle screw or locking mechanism such that the toggle screw rotatably engages through a bore in the support element into a corresponding opening in the holder or the gripper shaft, engaging behind an abutment, or the locking mechanism is designed as a positive connection between the support element and the holder.