Knife Folding Device Servo-Driven Stroke Adjustment
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Solution Overview
Problem
Conventional knife folding machines lack the ability to separately adjust the positions of the knife blade's reciprocal movement, leading to inefficient high-speed folding operations and durability issues due to offset loads, and fail to detect overload conditions, resulting in paper jams.
Innovation Solution
A knife folding machine with a knife drive unit comprising a rod, feed screw, and servomotor that allows for adjustable stroke and position control of the knife blade, along with a sensor system to detect overload and prevent paper jams by stopping the knife blade during multiple sheet bundle feeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the second position of the knife blade is adjusted by changing the position of the upper dead point of the slider crank mechanism, then the knife blade can reach different positions, but the first and second positions cannot be separately changed and the stroke remains constant
Solution Approach 1:
The invention divides the knife blade position control into two independent parameters: the upper dead point position (first position) and the lower dead point position (second position). By segmenting the position adjustment mechanism, the patent enables separate control of both positions while maintaining a relatively simple overall structure through the slider crank mechanism with adjustable links.
Solution Approach 2:
The patent introduces dynamic adjustability to the knife blade positions by making the upper dead point and lower dead point independently variable. This allows the first and second positions to be separately changed according to different sheet bundle thicknesses, providing adaptability without requiring a completely complex mechanism.
2Productivity
If the stroke of the knife blade is made constant in the slider crank mechanism, then the mechanism is simple, but the folding operation cannot be optimized for different sheet bundle types
Solution Approach 1:
The patent makes the stroke of the knife blade variable by independently adjusting the upper and lower dead point positions. This allows the stroke length to be optimized for different sheet bundle types, improving folding efficiency while maintaining a relatively simple slider crank mechanism structure.
Solution Approach 2:
The invention changes the geometric parameters of the slider crank mechanism, specifically the lengths of the links connecting the crank to the knife blade. By varying these parameters, the stroke of the knife blade can be adjusted to match different sheet bundle thicknesses, optimizing the folding operation for each type.
3Ease of operation
If the rod is constantly subjected to offset load in the slider crank mechanism, then the reciprocal movement is achieved, but the durability of the knife folding machine deteriorates
Solution Approach 1:
The patent introduces a counterweight mechanism to balance the offset loads acting on the rod during reciprocal movement. By adding a counterweight, the harmful offset forces are counteracted, reducing wear and stress on the rod and other components, thereby improving machine durability while maintaining the reciprocal movement capability.
Solution Approach 2:
The invention converts the harmful offset load into a beneficial balancing force by introducing a counterweight. The offset load that previously caused deterioration is transformed into a useful counterbalancing effect, reducing overall stress on the mechanism and improving reliability.
4Productivity
If the knife blade continues to move during overload conditions, then the folding operation completes, but paper jam occurs between the folding rollers
Solution Approach 1:
The patent introduces a feedback mechanism that monitors the folding operation in real-time. When overload conditions are detected (such as multiple sheet bundles fed at once), the system provides feedback to stop the knife blade movement, preventing paper jam while allowing normal folding operations to continue.
Solution Approach 2:
The invention replaces pure mechanical operation with a controlled system that incorporates sensing and control. By substituting automatic mechanical continuation with a controlled stop mechanism, the system prevents paper jam while maintaining productivity through selective operation.
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 adjustable folding operations for varying sheet bundles, improves machine durability by eliminating offset loads, and prevents paper jams by detecting and responding to overload conditions during folding.
Implementation Method 1
a feed screw extending in parallel to the rod and attached to the holder to rotate around an axis thereof, the block having a thorough hole which has thread grooves corresponding to the feed screw, the feed screw engaging with the through hole, the rod being reciprocated by the rotation of the feed screw
Implementation Method 2
a servomotor attached to the holder and having a drive shaft, the drive shaft extending in parallel to the feed screw
Data Source
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AI summary
In the knife folding machine of the present invention it is possible to easily adjust the stroke of the reciprocal movement of the knife blade 5. The rod 10 is reciprocated by the feed screw 12. The feed screw 12 is rotated by the servomotor 14. Thus when the knife blade 5 reciprocates between the first and second positions, the first and second positions thereof are separately adjusted by controlling the amount of the rotation of the servomotor 14.