Hole Punch Stop Unit With Gear Synchronization
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Solution Overview
Problem
Existing paper punches lack versatility in setting fixed edge distances and central positioning, making it difficult to achieve precise and asymmetric perforations, especially for non-standard formats and multiple perforation patterns.
Innovation Solution
A punch with a stop system that combines central positioning and fixed edge distance capabilities, featuring a transversely movable and lockable stop unit with toothed racks and gear mechanism, allowing for various locking positions to accommodate different formats and hole patterns without removing the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a stop system with fixed edge distance is used, then standard formats can be punched with constant edge distance, but non-standard formats and asymmetric perforations cannot be achieved precisely
Solution Approach 1:
The stop unit is made movable along the stop rail with multiple latching positions, allowing it to dynamically adjust between fixed edge distance mode (when latched at positions creating distance from hole pins) and central positioning mode (when latched at center position). This dynamic reconfigurability resolves the contradiction by enabling the same stop unit to serve both fixed edge distance and versatile format requirements.
Solution Approach 2:
The stop unit is designed to perform multiple functions: it can provide fixed edge distance positioning when latched at offset positions, central positioning when latched at center position, and serve as a guide for multiple perforation patterns. This multi-functionality allows a single device to handle both standard and non-standard formats, as well as symmetric and asymmetric perforations.
2Adaptability or versatility
If a stop system with central positioning is used, then different formats can be punched centrally, but fixed edge distance cannot be set and asymmetric perforations are impossible
Solution Approach 1:
The stop unit can dynamically switch between central positioning (when latched at the center position for symmetric formats) and offset positioning (when latched at positions creating fixed edge distance from hole pins). This dynamic adjustment enables the system to provide precise edge distance control when needed while maintaining central positioning capability for other formats.
3Productivity
If multiple punches are used for four-hole perforation, then predetermined patterns can be produced, but the device becomes very large and expensive
Solution Approach 1:
The stop unit can be latched at different positions to guide the material for different perforation patterns. By moving the stop unit to different latching positions, the same single punch can create multiple holes at different positions, replacing the need for multiple fixed punches and reducing device complexity while maintaining multiple perforation capability.
Solution Approach 2:
The stop unit serves as a universal positioning mechanism that can guide material for various perforation patterns (single hole, multiple holes, different positions) using the same punch mechanism. This multi-functionality eliminates the need for separate punches for each hole position, reducing device size and cost.
4Adaptability or versatility
If the stop unit is made movable for versatility, then different positioning modes are enabled, but the device complexity increases
Solution Approach 1:
The stop system is segmented into a movable stop unit that can be latched at different positions along the stop rail. This segmentation allows the stop unit to be independently positioned and latched, providing versatility without requiring complex integrated mechanisms. The stop unit acts as a separate, modular component that simplifies the overall system design.
Solution Approach 2:
The latching mechanism acts as an intermediary between the movable stop unit and the stop rail, enabling the stop unit to be easily positioned and locked at different locations. This intermediary mechanism simplifies the connection and control, reducing the complexity of making the stop unit movable while maintaining positioning accuracy.
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
Enables precise and versatile perforation of various formats, including non-standard sizes and multiple holes, with the ability to produce symmetric and asymmetric patterns efficiently, while maintaining device durability and compact size.
Implementation Method 1
The stops are located at the outer ends of two stop rails, which are designed as toothed racks and can only always be moved inwards or outwards to the same extent via gears
Implementation Method 2
These elements together form the stop unit, which is basically freely movable laterally on the base 1 of the punch on a lower cover 10, but can be locked in predetermined positions via spring-loaded locking levers 14
Data Source
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AI summary
The invention relates to a novel hole punch comprising a support for the item to be punched, at least one punching tool, which can be displaced through the item to be punched, and at least one stop system for the item to be punched. The stop system comprises a stop unit with two stop rails (6), which are connected to each other so as to be centered in relation to each other and which are disposed transversely displaceably to the longitudinal axis (L) of the hole punch. The stop rails (6) are connected to each other via a synchronization control, which guarantees the centering function. The synchronization control is formed by a gear wheel mechanism. Advantageously, the stop rails (6) and the synchronization control are disposed on a displaceable carriage (8), wherein the stop unit can be fixed in different positions in a locking manner.