Mechanical Rove Stopping Device for Spinning Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing yarn break stopping devices in spinning apparatuses are unreliable, energy-intensive, and increase waste material, requiring complex adaptations and maintenance, especially in dry and wet spinning processes.
Innovation Solution
A mechanical stopping device with a sensing lever and release lever, which activates a spring-loaded clamp to stop the rove supply at the input side of the drafting zone upon yarn break, preventing further delivery and minimizing waste, without the need for complex sensors or control systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pneumatic stopping devices with suction nozzles are used to collect fibres after yarn break, then the fibres are prevented from wrapping around the delivery roller, but the amount of waste material is considerably increased and energy consumption increases
Solution Approach 1:
The mechanical stopping device acts in advance by detecting the yarn break at the delivery end and activating the clamp at the input side before excessive rove can be delivered into the drafting zone. This preliminary action prevents the problem rather than addressing it after occurrence, thereby minimizing waste material while maintaining reliability.
Solution Approach 2:
The invention extracts the stopping function from the continuous rove delivery system by introducing a separate mechanical clamp device that can independently stop the rove supply. This separation allows the stopping action to occur without involving the pneumatic suction system, thereby eliminating the waste material and energy consumption issues associated with pneumatic devices.
2Reliability
If mechanical stopping devices with multiple levers are used to stop the rove directly before the drafting zone, then the rove is stopped before entry, but the construction is rather complex and requires adaptation of the spinning apparatus
Solution Approach 1:
The stopping device is segmented into two independent functional parts: a sensing lever with sensing pin for detecting yarn breaks, and a clamp device for stopping the rove. This segmentation allows each component to be simple and independent, reducing overall construction complexity while maintaining reliable stopping function.
Solution Approach 2:
The sensing lever serves multiple functions: it detects yarn breaks, activates the release lever, and triggers the clamp device. This multi-functionality reduces the need for separate components and complex control systems, thereby simplifying the overall construction while maintaining reliable rove stopping.
3Reliability
If mechanical systems stop the feed rollers after yarn break, then the rove supply is stopped, but the operation of feed rollers is stopped and maintenance becomes very difficult
Solution Approach 1:
The invention replaces the complex mechanical roller stopping system with a simpler mechanical clamp device. Instead of stopping the entire feed roller operation, the clamp device simply clamps the rove to stop its supply. This substitution maintains reliable rove stopping while dramatically simplifying the mechanism and improving ease of maintenance.
4Reliability
If electronic systems with piezoelectric sensors are used to detect yarn break and cut the rove, then the yarn break is detected and rove is cut, but the construction is complex and requires a lot of maintenance in dirty and wet conditions
Solution Approach 1:
The invention replaces electronic piezoelectric sensors and control systems with a purely mechanical sensing lever and clamp device. The sensing pin mechanically detects yarn breaks and triggers the clamp through mechanical linkages. This substitution eliminates complex electronics, reducing construction complexity and maintenance requirements in dirty and wet spinning conditions.
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
The device provides a reliable, energy-efficient, and simple mechanism to stop rove supply after yarn breaks, reducing waste and maintenance needs, adaptable to various spinning apparatuses without altering existing constructions.
Implementation Method 1
a spring-loaded clamp device such that in normal operation the clamp device is open and is closed after the break of a yarn through the conjoint pivot movement of said sensing lever and said release lever about said pivot axis in order to firmly clamp the rove
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Device (10) for stopping a rove supply in a spinning or twisting apparatus after breakage of a yarn (11) at the output side of a drafting zone (A) which comprises at least a pair of front rollers (3, 4) and a pair of back rollers (1, 2), whereby the rove (13) is delivered in normal operation by a pair of feed rollers from the input side and is formed to said yarn (11) in the drafting zone (A) and whereby the rove delivery is stopped upon breakage of the yarn (11), the stopping device (10) comprises a mechanical sensing lever (7) with a sensing pin (8) being repeatedly in contact with said yarn (11) and said sensing lever (7) is pivotally mounted on a pivot axis (X), wherein said sensing lever (7) has a release lever (9) opposite to said sensing lever (7) which is provided with a longitudinal release part (9a) being in engagement with a spring-loaded clamp device (12) such that in normal operation of the apparatus said clamp device (12) is open and closes after the break of the yarn (11) through the conjoint pivot movement of said sensing lever (7) and said release lever (9) about said pivot axis (X) to firmly clamp the rove (13) at the input side of said drafting zone (A) before said back rollers (1,2).