Strapping Machine Feeding and Reversing Mechanism
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Solution Overview
Problem
Conventional strapping machine mechanisms require two motors, leading to high electricity consumption and inadequate clamping force, resulting in strapping band slipping during the reversing process.
Innovation Solution
A feeding and reversing mechanism with a base, forward-reverse wheel assembly, tension wheel assembly, and spring units, where the strapping band is clamped between active and passive wheels with larger contact surfaces and spring-activated arms to ensure secure clamping without slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two motors (feeding motor and reversing motor) are used to drive the strapping band, then the strapping band can be fed and reversed, but the electricity consumption increases
Solution Approach 1:
The patent combines the feeding and reversing functions into a single motor-driven system. The active wheel is driven by one motor, and the passive wheel is mechanically connected to the active wheel through a belt transmission system, allowing the same motor to perform both feeding and reversing operations without requiring a second motor.
Solution Approach 2:
The single motor is designed to perform multiple functions: it can feed the strapping band forward when the active wheel rotates in one direction, and reverse the band when the active wheel rotates in the opposite direction. This multi-functional design eliminates the need for separate motors for each function.
2Device complexity
If point contact between strapping band and wheels is used, then the structure is simple, but the clamping force is inadequate causing slipping during reversing
Solution Approach 1:
The patent merges the feeding wheel and reversing wheel into a single integrated active wheel assembly where the passive wheel is mechanically coupled to the active wheel. This integration ensures that the same wheel structure provides both feeding and reversing functions with consistent contact surfaces, eliminating the need for separate wheel assemblies and improving clamping reliability.
Solution Approach 2:
The patent introduces a movable passive wheel that can dynamically adjust its position and contact pressure with the strapping band. The passive wheel is connected to the active wheel through a belt transmission system that allows it to move and adapt to different operating conditions, providing sufficient clamping force during reversing operations.
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 mechanism achieves efficient strapping and tightening of objects with reduced electricity consumption and improved clamping force, preventing slipping during the reversing process.
Implementation Method 1
The first spring unit includes a first spring and a fixing piece and is mounted on the first arm by extending the fixing piece through the first spring and the first arm. The first spring biases the first arm so that a gap is provided between the tension passive wheel and the tension active wheel for the strapping band to pass through.
Implementation Method 2
The second spring unit includes a second spring and a fastener and is installed on the first and second arms by extending the fastener through the second spring, the first arm, and the second arm.
Implementation Method 3
A rotary member is mounted to the second end of the second arm and is in contact with a cam. The second arm is pivoted to move the tension passive wheel and the first arm when the cam rotates, so that the tension passive wheel is moved toward the tension active wheel to clamp the strapping band securely.
Implementation Method 4
there is only a point contact between the strapping band 92 and each of the feeding wheel 911 and the reversing wheel 931, which provide an inadequate force for clamping the strapping band 92, resulting in slipping during the reversing process
Data Source
AI summary
A feeding and reversing mechanism for a strapping machine includes a forward-reverse wheel assembly and a tension wheel assembly which are mounted on a base and arranged in such a way to provide larger contact areas between a strapping band and the two wheel assemblies. The feeding and reversing mechanism further includes first and second spring units. The first spring unit helps to keep a suitable gap between an active wheel and a passive wheel of the tension wheel assembly for the strapping band to pass through. The second spring unit helps to move the passive wheel toward the active wheel of the tension wheel assembly, so that the strapping band can be clamped between the passive wheel and the active wheel tightly to facilitate reversing and tightening of the strapping band.