Flatbed Knitting Machine Movable Sinker Stress Reduction
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Solution Overview
Problem
The existing movable sinkers in flatbed knitting machines face shape restrictions and excessive stress in the opened state due to the biasing of the torque spring and the drawing of the passive arm, which can lead to large stresses and potential damage.
Innovation Solution
The design includes movable sinkers with a curved function arm, a support receive part, and a passive arm that diverges from the support receive part and function arm, with a suppressing part of the sinker jack positioned to reduce the stress on the torque spring in the closed state and avoid excessive force in the opened state, allowing for easier moderation of shape restrictions and stress distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the torque spring is used to bias the function arm in the direction of advancing to the needle bed gap, then the sinker can be made into a closed state with pressing force, but the stress on the torque spring becomes too large in the opened state
Solution Approach 1:
The sinker jack is divided into two distinct functional parts: a leading edge part that acts on the passive arm, and a suppressing part that acts on the torque spring. This segmentation allows independent control of the sinker's opened and closed states, resolving the stress issue by separating the functions of opening and closing actions.
Solution Approach 2:
The sinker jack serves as an intermediary mechanism between the driving force and the sinker. By providing two different interaction points (leading edge part and suppressing part), it mediates the force application to achieve both opening and closing functions while controlling stress on the torque spring.
2Ease of operation
If the leading edge part of the sinker jack acts on both the passive arm and torque spring closely positioned, then the sinker can be opened and closed, but the shapes of portions for the torque spring and sinker are restricted
Solution Approach 1:
By segmenting the sinker jack into two spatially separated parts (leading edge part and suppressing part), the design provides independent action points on the passive arm and torque spring. This eliminates the need for closely positioned interaction points, thereby removing shape restrictions on the torque spring and sinker components.
Solution Approach 2:
The two functional parts of the sinker jack are positioned at different locations along the jack's length, utilizing the dimensional space available in the mechanism. This spatial distribution allows both the passive arm and torque spring to have optimal shapes without interference, resolving the shape restriction problem.
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 design effectively reduces the stress on the torque spring in the opened state, preventing excessive force and maintaining a stable closed state, while allowing for easier integration and reduced risk of damage to the sinker and torque spring components.
Implementation Method 1
a torque spring, one end of which is bonded to the sinker and the other end of which receives an action by a suppressing part provided on a sinker jack in a state where the sinker is made into a closed state
Implementation Method 2
when a sinker jack is made to retreat in a direction of being apart from a needle bed gap, the passive arm retreats by receiving an action by a leading edge part of the sinker jack
Implementation Method 3
The movable sinker has a support receive part which is supported on a needle bed in the vicinity of the needle bed gap so as to be capable of rocking-displacement
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3(a)~3(b)
AI summary
[Problem to be solved] To provide a flatbed knitting machine equipped with the movable sinkers, each of which is capable of moderating shape restriction for a torque spring and a sinker even when stresses of the torque spring is prevented from being too large in a sinker opened state, for a part of the movable sinker receiving actions from a sinker jack. [Solution] A passive arm 11c of a sinker 11 diverges from a portion between a support receive part 11a and a function arm 11b. Even when a sinker jack 12 is made to retreat in the direction of being apart from a needle bed gap 2 and the sinker 11 is made into an opened state, a suppressing pressure from a suppressing part 12d to the other end 13b of the torque spring is weakened, so that a stress of the torque spring can be prevented from being too large in the opened state of the sinker 11. The suppressing part 12d and the leading edge part 12c of the sinker jack 12 need not be made closer to each other and restriction for shapes of the sinker 11 and the torque spring 13 can be moderated.