Overlock Sewing Machine Interlock Switching Mechanism
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Solution Overview
Problem
The existing overlock sewing machine configurations face challenges in satisfactorily switching the operating state from the interlock release state to the interlock state due to potential misalignment of the engagement portion with the notch, leading to incomplete state transitions.
Innovation Solution
The overlock sewing machine incorporates a mechanism with an eccentric cam, a swing member, and a position switching mechanism that includes a compression coil spring and a slot, allowing the upper blade to be precisely moved between interlock and retraction positions through a coordinated operation of the interlock switching mechanism and the position switching mechanism, ensuring proper state switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the upper blade position switching unit is rotated to return the second link unit to the driving state, then the upper blade position switching unit applies rotational force to rotate the second link unit, but the engagement portion cannot be satisfactorily engaged with the notch of the rod due to timing misalignment
Solution Approach 1:
The patent introduces a preliminary action mechanism where the rod is moved downward by the interlock switching unit before the engagement portion engages with the notch. This preliminary movement of the rod creates proper timing alignment, ensuring that when the upper blade position switching unit rotates the second link unit, the engagement portion can be satisfactorily engaged with the notch without timing misalignment issues.
2Adaptability or versatility
If the cam portion is not engaged with the upper blade position switching unit, then the upper blade position switching unit rotates the second link unit to switch the upper blade from retraction position to driving position, but the operation state cannot be satisfactorily returned from interlock release state to interlock state
Solution Approach 1:
The patent employs preliminary action by moving the rod downward in advance through the interlock switching unit before the engagement portion engages with the notch. This preliminary rod movement ensures proper timing and positioning, enabling complete and reliable transition from interlock release state back to interlock state when the upper blade position switching unit rotates the second link unit.
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 enables reliable and efficient switching between interlock and interlock release states, ensuring the upper blade is accurately positioned, thereby improving the operational stability and convenience of the sewing machine.
Implementation Method 1
a rod configured such that it extends in a direction that is orthogonal to an axial direction of the main shaft, and arranged such that one end portion is coupled to the main shaft by an eccentric cam, which allows the rod to be swung by a driving force applied by the main shaft
Data Source
AI summary
With an overlock sewing machine set to an interlock state and the upper blade in an interlock position, upon turning the operating shaft toward one side around its axis, an interlock switching mechanism displaces the other end portion of a rod and sets an interlock release state. A pressing portion presses a first switching portion to swing a swing member toward the forward swing side, which displaces the upper blade to retraction position. With the state set to interlock release with the upper blade in retraction position, upon turning the operating shaft toward one side around its axis, the pressing portion presses a second switching portion to swing the swing member toward the reverse swing side, which displaces the upper blade to interlock position. The interlock mechanism displaces the other end portion of the rod to set the state to interlock.