Reinforcing Bar Binding Machine Sleeve Rotation Mechanism
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Solution Overview
Problem
The existing reinforcing bar binding machines have a complex structure that is large in size and weight, prone to component loosening, and requires additional components to maintain frictional force, leading to twisting failures due to inadequate lubrication and increased resistance.
Innovation Solution
A simplified structure with a sleeve and tip end shaft configuration that uses long and short fins, a spiral screw groove, and a bumper to ensure reliable rotation and correct hook positioning, eliminating the need for a compression spring and reducing the number of components, while maintaining high load-bearing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double structure with inner and outer sleeves is used to hold hooks and prevent key disengagement, then the hooks can be securely mounted and the key can be retained, but the structure becomes complicated, the diameter becomes large, and the weight increases
Solution Approach 1:
The invention merges the inner and outer sleeves into a single integrated sleeve structure. The single sleeve incorporates both the hook mounting function at its front portion and the key retention function at its rear portion, eliminating the need for separate inner and outer sleeves while maintaining both security functions.
Solution Approach 2:
The single sleeve is designed to perform multiple functions simultaneously: it holds the hooks rotatably at the front, prevents the key from disengaging at the rear, and provides structural support for the entire mechanism. This multi-functional design replaces the specialized inner and outer sleeves.
2Stability of the object's composition
If a set screw is used to fix the inner sleeve to the outer sleeve, then the two sleeves can be integrated, but the set screw easily loosens during repeated use and cannot bear high loads
Solution Approach 1:
The invention extracts and eliminates the set screw from the structure by merging the inner and outer sleeves into a single piece. This removes the weak link that was prone to loosening while maintaining the integrated sleeve functionality through direct monolithic construction.
3Reliability
If the outer sleeve is made long to cover the key and prevent it from coming out, then the key can be retained, but the diameter becomes large and the weight increases
Solution Approach 1:
The invention combines the key retention function into the single sleeve structure without requiring excessive length. The sleeve is designed to extend just sufficiently to retain the key while maintaining a compact overall diameter, eliminating the need for the outer sleeve to be unnecessarily long.
4Ease of operation
If a compression spring is installed between the inner sleeve and tip end shaft to open hooks, then the hooks can be positioned, but the spring load cannot be increased and the structure becomes complicated
Solution Approach 1:
The invention removes the compression spring from the structure by integrating the hook opening mechanism directly into the single sleeve. The sleeve is designed to automatically open and close hooks through its rotational movement, eliminating the need for separate spring components.
5Ease of operation
If grease is applied between the sleeve and support members to reduce friction, then the sleeve can rotate smoothly, but the grease becomes insufficient and friction increases when debris is absorbed
Solution Approach 1:
The invention designs the single sleeve structure to minimize its contact surface area with support members, reducing the amount of grease required and the capacity for debris absorption. The streamlined design inherently reduces friction points while maintaining necessary rotational movement.
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 achieves a compact, lightweight design that reliably returns hooks to predetermined positions, maintains high load-bearing capacity, and minimizes operational time and component wear, even in environments with deteriorated lubrication.
Implementation Method 1
by a frictional force between the spiral screw groove and the key caused by colliding the sleeve with the bumper
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A reinforcing bar binding machine comprising: a sleeve (11,16) having a tip end on which a hook (10) is pivotally mounted; a long fin (33) which is long in an axial direction of the sleeve (11,16) and a short fin (34) which is short in the axial direction, the long and short fins (33) being formed on the sleeve (11,16) at intervals in a circumferential direction of the sleeve (11,16); a tip end shaft (12) fitted in an inside of the sleeve (11,16); a spiral screw groove (14) formed on the tip end shaft (12); a fitting opening (13) that penetrates from an outside to the inside of the sleeve (11,16); a key (15) fitted in the fitting opening (13) and brought in mash engagement with the screw groove (14); a rotation stopper (35) provided on a binding machine body (1) and engageable with the long and short fins (33,34); and a bumper (42) provided between a jutting part (27) provided on a base portion of the tip end shaft (12) and an end face of the sleeve (11,16); wherein, when the long fin (33) engages with the rotation stopper (35), the sleeve (11,16) advances with respect to the tip end shaft (12) by a rotation of the tip end shaft (12) so that the hook (10) grasps a wire (W), wherein, when the sleeve (11,16) retreats to a standby position by a reverse rotation of the tip end shaft (12) and the short fin (34) disengages from the rotation stopper (35), the tip end shaft (12) and the sleeve (11,16) integrally rotate so that the long fin (33) engages with the rotation stopper (35) to set the hook (10) in a predetermined orientation, wherein, when the sleeve (11,16) retreats, by a frictional force between the spiral screw groove (14) and the key (15) caused by colliding the sleeve (11,16) with the bumper (42), the tip end shaft (12) and the sleeve (11,16) integrally rotate.