Binding Machine Punch Plate Staggered Pin Cam Profile
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Solution Overview
Problem
Existing binding machines require significant force input and exhibit rough, uneven motion during the punching process due to varying force requirements across different punch pins, leading to a disjointed operational feel for users.
Innovation Solution
A binding machine with a punch mechanism featuring a plate with staggered, obliquely angled punch pins and a cam system that dictates displacement, reducing peak force and smoothing the force profile by distributing force evenly and providing a mechanical advantage, resulting in a more ergonomic user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple punch pins are used to punch through the stack of sheets, then the binding function is achieved, but the force required varies significantly during the punch stroke causing rough and uneven motion
Solution Approach 1:
The punch plate is segmented into multiple zones with different numbers and arrangements of punch pins in different regions. This segmentation allows different portions of the stack to be punched at different times during the stroke, distributing the force requirements more evenly throughout the motion rather than having all pins engage simultaneously or in large groups.
Solution Approach 2:
Different regions of the punch plate have different local qualities in terms of pin density and arrangement. The punch pins are non-uniformly distributed with varying spacing and numbers in different zones, creating localized punching patterns that smooth out the overall force profile by ensuring continuous engagement of pins throughout the stroke.
2Productivity
If multiple punch pins strike the stack of sheets simultaneously or in large groups, then punching efficiency is maintained, but peak force requirements increase significantly
Solution Approach 1:
The punching action is segmented into multiple phases across different regions of the punch plate. By arranging pins in zones that engage at different times, the total punching load is divided into smaller incremental forces applied sequentially rather than all at once, reducing peak force requirements while maintaining overall punching efficiency.
Solution Approach 2:
The punch stroke implements periodic action through the sequential engagement of different pin groups in different zones. This creates a rhythm of force application where pins engage and disengage in a controlled sequence, preventing large sudden force peaks while ensuring complete punching of the stack through repeated incremental action.
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 lowers peak punching force by up to 30% and achieves a smooth force profile with a 15% or lower force change, enhancing user comfort and operational efficiency, particularly in manual and motor-actuated machines.
Implementation Method 1
at least one cam mounted on the shaft for rotation therewith. The cam is coupled with the plate to drive the plate in a punching direction and includes a cam profile that dictates displacement of the plate in the punching direction relative to rotation of the shaft
Data Source
AI summary
A binding machine includes a body, an actuator coupled with the body, and a punch mechanism housed in the body for punching a stack of sheets upon actuation of the actuator. The punch mechanism includes a plate including a plurality of punch pins. The punch pins are configured to punch through the stack of sheets during a punch stroke. A shaft is coupled with the actuator such that movement of the actuator causes rotation of the shaft. At least one cam is mounted on the shaft for rotation therewith. The cam is coupled with the plate to drive the plate in a punching direction. The cam includes a cam profile that dictates displacement of the plate in the punching direction relative to rotation of the shaft.