Sheet Material Punching Device Auxiliary Cam Return Mechanism
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Solution Overview
Problem
The existing sheet material punching devices require a high driving energy due to a large spring constant for returning the slide arm to its initial position, especially when dealing with thick or hard materials, which increases the driving load and necessitates a more powerful driving source.
Innovation Solution
Incorporating an auxiliary cam and cam follower mechanism that converts rotational motion into backward movement to return the slide arm to its initial position, eliminating the need for a biasing member and reducing the driving load required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tension spring with large spring constant is used to return the slide arm to initial position, then the slide arm can return reliably even with high punching load, but the driving load and driving energy increase
Solution Approach 1:
The patent extracts the return function from the tension spring system and relocates it to the cam mechanism. The cam groove geometry is designed to automatically return the slide arm to its initial position during the reciprocating motion, eliminating the need for a tension spring with large spring constant and reducing the driving energy required.
Solution Approach 2:
The patent merges the return function with the main reciprocating motion function by integrating it into the cam mechanism. The cam groove is designed such that the slide arm is pushed forward by the cam follower during the punching stroke and automatically returns to the initial position as the cam rotates, combining both functions in a single mechanism.
2Reliability
If a tension spring with large spring constant is used to ensure slide arm return, then the slide arm returns reliably, but the driving source size and driving energy increase
Solution Approach 1:
The patent extracts the return function from the tension spring system and relocates it to the cam mechanism. The cam groove geometry is designed to automatically return the slide arm to its initial position during the reciprocating motion, eliminating the need for a tension spring with large spring constant and reducing the driving energy required.
Solution Approach 2:
The patent merges the return function with the main reciprocating motion function by integrating it into the cam mechanism. The cam groove is designed such that the slide arm is pushed forward by the cam follower during the punching stroke and automatically returns to the initial position as the cam rotates, combining both functions in a single mechanism.
3Reliability
If a large spring constant is used for the tension spring, then the slide arm returns to initial position under high load, but the driving load increases
Solution Approach 1:
The patent extracts the return function from the tension spring system and relocates it to the cam mechanism. The cam groove geometry is designed to automatically return the slide arm to its initial position during the reciprocating motion, eliminating the need for a tension spring with large spring constant and reducing the driving energy required.
Solution Approach 2:
The patent merges the return function with the main reciprocating motion function by integrating it into the cam mechanism. The cam groove is designed such that the slide arm is pushed forward by the cam follower during the punching stroke and automatically returns to the initial position as the cam rotates, combining both functions in a single mechanism.
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 solution reduces the driving energy needed for the driving source and simplifies the mechanism, allowing for cost-effective and efficient operation by leveraging rotational motion to return the slide arm, thus preventing an increase in driving energy consumption.
Implementation Method 1
cams provided in the respective slide arms, the cams having cam grooves capable of converting the rotational motion of the driving mechanism into the reciprocating motions of the slide arms
Implementation Method 2
The tension spring 204 constantly keeps biasing the slide arm 201 in a direction where the slide arm 201 moves back to the initial position
Data Source
AI summary
A sheet material punching device includes a plurality of punches and links, a driving mechanism having drive gears capable of transmitting a rotational driving force of an electric motor (driving source), and slide arms allowed to reciprocate along the longitudinal direction of a frame, the slide arms making the punches reciprocate in a punching direction along with their own reciprocating motions by the intermediary of links. The slide arms respectively have cams capable of converting the rotational motion of the driving mechanism into the reciprocating motions of the slide arms, and auxiliary cams capable of moving the slide arms to predefined initial positions. The drive gears respectively have cam followers to be engaged with the cams, and auxiliary cam followers to be engaged with the auxiliary cams. The sheet material punching device return the slide arms to the initial positions without increasing a driving energy.