Sheet Conveying Apparatus Cam Position Control
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Solution Overview
Problem
Conventional sheet conveying apparatuses face challenges in accurately adjusting the curl correcting amount for sheets due to fluctuations in cam member position caused by reaction forces and vibrations, leading to inaccurate nip pressure adjustment in curl correcting portions.
Innovation Solution
A sheet conveying apparatus with a rotating body pair, cam members, and a driving mechanism that allows for independent rotation in two directions, using one-way bearings and clutch mechanisms to transmit power and restrict cam member movement, ensuring accurate position control and reducing the need for multiple motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a clutch mechanism is used to transmit driving power to curl correcting portions in response to motor rotation, then the number of motors is reduced and space is saved, but the cam member position fluctuates due to reaction forces when driving power is not transmitted
Solution Approach 1:
A reaction force receiving member is introduced as an intermediary element to receive and counterbalance the reaction force generated when the cam member adjusts the nip pressure. This mediator prevents the reaction force from causing cam member position fluctuations, thereby maintaining positioning accuracy while still using the clutch mechanism to reduce motor count.
2Manufacturing precision
If the cam member position is adjusted in multiple stages for various parameters, then the curl correction accuracy is improved, but the cam member position becomes unstable due to reaction forces and vibrations
Solution Approach 1:
The reaction force receiving member acts as a counterbalancing element that provides an opposing force to the reaction force generated during cam member operation. This counterweight mechanism stabilizes the cam member position by neutralizing the destabilizing reaction forces and vibrations, enabling precise multi-stage position adjustment for accurate curl correction.
3Object-generated harmful factors
If the hard roller bites into the soft roller to form a curved nip portion, then the curl correction function is achieved, but the reaction force to the pressing force causes cam member position fluctuation
Solution Approach 1:
The reaction force that was previously causing harmful position fluctuations is now utilized beneficially. The reaction force receiving member converts the harmful reaction force into a stabilizing force by providing counterbalancing support, thereby transforming the adverse effect into a beneficial contribution to system stability and 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
This configuration enables precise control of curl correction, minimizing power consumption, saving space, and reducing costs while maintaining accurate nip pressure adjustments, even under varying conditions.
Implementation Method 1
a restricting portion restricting the cam member from turning in a direction opposite to a turning direction turned in response to the rotation, in the first direction, of the driving portion
Implementation Method 2
Japanese Patent Application Laid-open No. 2002-93475 proposes a configuration in which the first and second curl correcting portions are independently driven by normal and reverse rotations of a motor by using one normally and reversely rotatable motor and a clutch mechanism, such as a clutch, transmitting a rotational force only in one direction
Implementation Method 3
a cam member moving one of the rotating body pair to another one
Data Source
AI summary
A sheet conveying apparatus is provided with a driving portion, and the driving portion is normally rotated, driving power from the driving portion is transmitted to a cam member through a transmitting portion. Then, one of a rotary roller pair is moved to another one. The sheet conveying apparatus further includes a restricting portion that restricts the cam member from turning in a direction opposite to a turning direction turned in response to a normal rotation of the driving portion.