Sheet Conveyor Stack Lever Adjusts Pressing Force
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Solution Overview
Problem
Existing sheet conveyor devices face challenges in optimizing the pressing force of the sheet pressing member, leading to issues such as corner folding and collisions between sheets, as the force is either too strong or too weak, affecting the stacking and discharge of sheets.
Innovation Solution
A sheet conveyor device with a stack lever mechanism that adjusts its urging force using torsion coil springs, allowing the force to change stepwise based on the number of discharged sheets, preventing corner folding and collisions by ensuring appropriate pressure is applied depending on the sheet stack height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressing force of the sheet pressing member is increased to prevent sheet collision, then sheet stacking reliability is improved, but corner folding occurs at the leading end of discharged sheets
Solution Approach 1:
The pressing force is made dynamic rather than fixed. The stack lever is configured to swing upward when a sheet strikes it, temporarily reducing the pressing force during sheet discharge to prevent corner folding, while maintaining adequate pressing force for preventing sheet collision during stacking.
Solution Approach 2:
The pressing force parameter is changed based on operational conditions. By allowing the stack lever to swing upward upon sheet impact, the pressing force is automatically reduced during the discharge phase, preventing corner folding while maintaining reliability during the stacking phase when the lever returns to its original position.
2Object-affected harmful factors
If the pressing force of the sheet pressing member is decreased to avoid corner folding, then sheet discharge quality is improved, but sheet collision occurs between discharged and stacked sheets
Solution Approach 1:
The pressing force is dynamically adjusted through the swingable stack lever mechanism. During sheet discharge, the lever swings upward to reduce pressing force and avoid corner folding. During sheet stacking, the lever returns to its original position to maintain adequate pressing force and prevent sheet collision.
Solution Approach 2:
The stack lever performs periodic swinging motion in response to sheet discharge cycles. Each sheet impact causes the lever to swing upward temporarily, then return to its original position, creating a periodic variation in pressing force that adapts to the rhythmic nature of sheet discharge and stacking operations.
3Stability of the object's composition
If a fixed heavy sheet pressing member is used to prevent sheet collision, then sheet stacking stability is improved, but the pressing force cannot be reduced during sheet discharge causing corner folding
Solution Approach 1:
The fixed sheet pressing member is replaced with a swingable stack lever that can dynamically adjust its position. The lever swings upward when a sheet strikes it, temporarily reducing the pressing force to prevent corner folding, while maintaining stacking stability when returned to its original position by the urging force.
Solution Approach 2:
The urging force mechanism acts as a counterbalance to the stack lever's weight. This allows the lever to be positioned at different heights depending on operational needs - maintaining stacking stability during normal operation while enabling upward swing to reduce pressing force during sheet discharge.
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 effectively prevents corner folding and collisions by adjusting the urging force of the stack lever in response to the number of discharged sheets, ensuring sheets are stacked and discharged without curling or collision, thereby optimizing the pressing force.
Implementation Method 1
a pair of torsion coil springs 35, 36 which urge the stack lever 33 in a direction in which the stack lever 33 is caused to swing downwards
Data Source
AI summary
A conveyor device includes conveyor unit to convey a sheet along a path, a holder disposed at a downstream end of the path and holding sheets discharged from the conveyor unit in a stack, and a pressing unit. The pressing unit moves between a first position and a third position via a second position, contacts an uppermost sheet in the stack, and rises in an upward direction that approaches the third position as the sheets in the stack increase. The conveyor device also includes an urging member that does not apply an urging force to the pressing unit when the pressing unit is positioned between the first position and the second position; and applies an urging force to the pressing unit to urge the pressing unit toward the first position when the pressing unit is positioned between the second position and the third position.