Compact Hole Punch Cam-Roller Linkage Mechanism
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Solution Overview
Problem
Conventional hole punching devices require significant force to operate and often have a large footprint, making them inefficient and inconvenient for desktop use, especially when trying to punch multiple holes in a stack of papers.
Innovation Solution
A compact hole punch device with a cam-roller linkage mechanism that translates a long handle stroke into high force, allowing for efficient hole punching with minimal friction and a small footprint, featuring a vertically-oriented paper slot and horizontally-moving punch pins to reduce the device's size while maintaining leverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a long handle is used to provide large handle stroke and increased leverage, then the operating force is reduced, but the device footprint increases
Solution Approach 1:
The patent reorients the punch pins to move horizontally instead of vertically, and positions the paper slot vertically instead of horizontally. This dimensional change allows the handle to extend along the longitudinal axis of the device, providing a long handle stroke without increasing the lateral footprint, as the handle motion is now aligned with the device's length rather than requiring additional lateral space.
Solution Approach 2:
The patent employs a cam-roller linkage mechanism that converts the handle's linear motion into rotational motion of the cam, which then drives the punch pins horizontally. This dynamic mechanism allows the handle to maintain a long stroke while the internal components compactly transform this motion, reducing the need for additional space and enabling the long handle to be integrated within a compact device envelope.
2Force
If a long handle is used to provide increased leverage, then the operating force is reduced, but the device complexity increases
Solution Approach 1:
The cam-roller linkage acts as an intermediary mechanism between the handle and the punch pins. The cam converts the handle's linear motion into rotational motion, which then drives the punch pins horizontally. This intermediary mechanism efficiently transmits and transforms force, providing the necessary leverage to reduce operating force while maintaining a relatively simple and compact overall structure.
3Device complexity
If punch pins move vertically to cut holes, then the mechanism is simple, but the device footprint increases
Solution Approach 1:
The patent changes the direction of punch pin motion from vertical to horizontal, aligning it with the longitudinal axis of the device. This dimensional change allows the punch pins to move within the existing length of the device body, eliminating the need for additional vertical space and reducing the overall footprint while maintaining the simplicity of the punching 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
The device achieves a large handle stroke with reduced operating force and minimal friction, enabling efficient punching of multiple pages with a compact design that saves desktop space and allows for easy handling.
Implementation Method 1
A compact hole punch device with a cam-roller linkage mechanism that translates a long handle stroke into high force, allowing for efficient hole punching with minimal friction and a small footprint
Data Source
AI summary
A compact hole punch device includes a generally vertical entry paper slot with an elongated handle hinged at one end of the punch device extending toward the opposite end of the device along side the paper slot. A chip chamber extends along the punch device opposite the slot from the handle. A roller cam mechanism concentrates forces in a small area of the device to provide a very compact, rigid action. An elongated chip tray is pivotably attached to the chip chamber including a lowered position where chips are easily emptied out an open distal end of the tray.