Loom Leveling Device Using Eccentric Slider for Low-Power Actuation
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Solution Overview
Problem
Existing leveling devices for looms require powerful actuators and suffer from issues such as jerking motion, which can be detrimental to the loom's mechanics, and face challenges in sealing and layout, especially when transitioning between weaving and leveling configurations.
Innovation Solution
A leveling device with an eccentric member secured to the shaft of the levers, a slider movable along a fixed axis, and leveling rods that pivot on the eccentric member and a shoe hinge, allowing for the use of a low-power electric motor and reducing the power required for leveling by leveraging torque transmission through a connecting rod, while maintaining motor axis stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a traditional leveling device with a connecting rod-crank system is used, then the shaft of the levers can be moved between weaving and leveling configurations, but a powerful motor is required and the motor oscillates within the frame causing sealing problems
Solution Approach 1:
The patent introduces a fixed motor positioned outside the frame that acts as an intermediary to drive the leveling mechanism. The motor is coupled to the shaft of the levers through a transmission mechanism (gears or belts) to provide rotational motion without the motor itself oscillating within the frame, thereby solving the sealing problem while reducing the power required.
Solution Approach 2:
Instead of having the motor oscillate within the frame to directly move the shaft between configurations, the invention inverts the approach by using a fixed motor outside the frame that rotates continuously or in fixed positions, transmitting motion through a mechanism that achieves the configuration changes. This reverses the traditional arrangement and eliminates the motor oscillation issue.
2Ease of operation
If a leveling device with an eccentric integral with the shaft of the levers is used, then the shaft can be moved between configurations, but the actuator is highly stressed and requires great effort causing jerking motion
Solution Approach 1:
The patent introduces a fixed motor positioned outside the frame as an intermediary to drive the leveling mechanism. The motor is coupled to the shaft of the levers through a transmission mechanism (gears or belts) to provide rotational motion without the motor itself oscillating within the frame, thereby solving the sealing problem while reducing the power required.
Solution Approach 2:
Instead of having the motor oscillate within the frame to directly move the shaft between configurations, the invention inverts the approach by using a fixed motor outside the frame that rotates continuously or in fixed positions, transmitting motion through a mechanism that achieves the configuration changes. This reverses the traditional arrangement and eliminates the motor oscillation issue.
3Ease of repair
If a traditional leveling device is used, then the shaft of the levers can be moved between configurations, but the device size is large and difficult to access for maintenance
Solution Approach 1:
The patent extracts the motor from the internal frame structure and positions it outside the frame. This extraction reduces the volume occupied within the loom frame and makes the motor easily accessible for maintenance operations without requiring disassembly of internal components.
Solution Approach 2:
The invention moves the motor from the internal two-dimensional plane of the frame to an external position in three-dimensional space around the frame. This dimensional relocation allows the motor to be positioned in an accessible location outside the compact frame structure, improving maintenance accessibility while reducing internal volume requirements.
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 solution enables the use of a low-power motor, reduces the power required for leveling by half, preserves motor axis stability, and provides a compact, easily accessible design that minimizes mechanical stress and improves maintenance accessibility.
Implementation Method 1
an eccentric leveling member secured to the shaft of the levers
Implementation Method 2
the engine torque transmission forces to the leveling lever are multiplied by the use of a connecting rod
Implementation Method 3
a slider movable in translation along a fixed axis between a first position corresponding to the weaving configuration and a second position corresponding to the leveling configuration
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Weave mechanism (1) for a loom equipped with a leveling device (8) for a plurality of oscillating levers (26), the oscillating levers being provided with follower rollers (42) and mounted on a lever shaft (28), the lever shaft being movable between a weaving configuration, where the follower rollers of the oscillating levers bear against cams (18) of the weave mechanism, and a leveling configuration, where the follower rollers of the oscillating levers are moved away from the cams of the weave mechanism. The leveling device includes an eccentric leveling member fixed to the lever shaft.the armor mechanism further includes a slider movable in translation along a fixed axis (X66) between a first position corresponding to the weaving configuration of the shaft (28) of the levers (26) and a second position corresponding to the leveling configuration of the shaft of the levers, and at least one leveling rod (60) having a first end (84) pivotally mounted on the eccentric leveling member about an axis (X84) of the rod parallel to the central axis (X28) of the shaft of the levers and a second end (86) pivotally mounted on the slide about an axis (X86) of articulation of the slide parallel to the axis of the shaft of the levers.