Rotating Punch Members for Debris Dispersion
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Solution Overview
Problem
Conventional hole-punching devices face issues with paper cutting debris accumulation, leading to increased load on the drive motor and potential mechanical failure, especially when punching thick or plastic sheets, requiring a large drive unit and higher costs.
Innovation Solution
The device employs hole-punching members that move between top and bottom dead centers while rotating around their axis, changing rotation directions for each sheet, which reduces shear force and disperses paper cutting debris evenly, allowing for high-speed punching with a compact and lightweight drive mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional hole-punching members move only in up and down direction without rotation, then the structure is simple, but paper cutting debris accumulates directly below the punch members causing increased load on drive motor and potential mechanical failure
Solution Approach 1:
The punch member is made rotatable around its longitudinal axis in addition to its up-and-down motion. This dynamic addition allows the punch member to rotate in a predetermined direction during the punching operation, which effectively disperses paper cutting debris away from the area directly below the punch members, preventing accumulation and reducing the risk of mechanical failure.
2Reliability
If a large drive motor is used to handle paper cutting debris accumulation, then punching capability is maintained, but device size and cost increase
Solution Approach 1:
By making the punch member rotatable, the system prevents paper cutting debris from accumulating in the first place. This eliminates the need for an oversized drive motor to handle debris-related load increases, allowing for a more compact and lighter motor design while maintaining reliable punching capability.
3Productivity
If hole-punching members are disposed to punch simultaneously at multiple positions, then productivity increases, but paper cutting debris accumulation increases leading to higher load on drive motor
Solution Approach 1:
The rotatable punch members disperse paper cutting debris away from the punching area during simultaneous multi-position punching operations. This prevents debris accumulation that would otherwise increase drive motor load, allowing high-productivity simultaneous punching without the penalty of excessive motor loading.
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 configuration effectively manages paper cutting debris, reduces the shear force required for punching, and enables high-speed operation with a smaller, lighter drive motor, preventing mechanical failure and lowering costs.
Implementation Method 1
the hole-punching members are configured to rotate in a predetermined direction around a longitudinal axis of rotation when being moved from the top dead center to the bottom dead center
Data Source
AI summary
A sheet hole-punching device includes a plurality of punch members, a base frame for slidably supporting the punch members in a hole-punching direction and rotationally supporting the punch members, and a drive member having a plurality of cam portions. Each punch member has a leading end with a hole-punching blade. Each cam portion engages each punch member to move the punch member in the hole-punching direction. A plurality of cam devices is also formed in the sheet hole-punching device. Each cam device is disposed between the base frame and each punch member for converting a hole-punching direction movement of the punch member into a rotational movement so as to rotate the punch member while moving in the hole-punching direction.