Sheet Feeder Roller Clutch Dynamics
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Solution Overview
Problem
Existing sheet feeders in automatic document feeders (ADFs) face challenges in efficiently feeding sheets one by one without increasing the size or cost of the feeder, particularly due to resistance issues during sheet insertion and complexity in design.
Innovation Solution
A sheet feeder design incorporating a roller system with a clutch mechanism that allows the roller to rotate within a predetermined range during idle conditions, enabling efficient sheet feeding and reverse rotation for easy document insertion and removal, along with a drive transmission mechanism and return mechanism to manage sheet movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pickup roller and pickup-side nip member are kept in constant contact to ensure reliable sheet feeding, then sheet feeding reliability is improved, but user insertion resistance increases and document insertion becomes difficult
Solution Approach 1:
The pickup roller is designed to be movable in the sheet feeding direction rather than fixed. During document insertion, the pickup roller can move in the insertion direction to reduce resistance and facilitate easy insertion. During sheet feeding operation, the pickup roller returns to its original position to maintain contact with the nip member for reliable feeding. This dynamic adjustment resolves the contradiction between insertion ease and feeding reliability.
2Ease of operation
If a solenoid mechanism is added to move the pickup roller for easy insertion, then document insertion ease is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The pickup roller is designed to move automatically in response to the insertion force applied by the user. The spring member and movable structure enable the pickup roller to self-adjust its position during insertion without requiring external actuation mechanisms. This self-service approach eliminates the need for solenoids or motors, reducing device complexity while maintaining ease of operation.
3Ease of operation
If the pickup roller is made movable to reduce insertion resistance, then document insertion ease is improved, but the structure size and manufacturing cost may increase
Solution Approach 1:
The movable pickup roller structure utilizes simple spring members and guide surfaces that are already present in the feeder design. The roller moves along the guide surface in response to insertion force, and the spring member provides the return force. This approach adds minimal structural elements and maintains compatibility with existing manufacturing processes, avoiding significant cost increases while achieving easy insertion.
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 reliable and efficient separation and feeding of sheets one by one, reducing user resistance during insertion and maintaining a compact, cost-effective feeder design.
Implementation Method 1
the pickup-side nip member 95 is disposed to make contact with and separate from the pickup roller 94, and is urged by a spring member, not shown, in contact with the pickup roller 94
Implementation Method 2
a clutch configured to enable the roller to rotate within a predetermined range of rotation in the sheet feeding direction during an idle condition
Implementation Method 3
a motor configured to drive the roller
Data Source
AI summary
A sheet feeder includes a roller configured to feed a plurality of sheets one by one in a sheet feeding direction to a feed path, and a motor configured to drive the roller. The sheet feeder also includes a drive transmission mechanism configured to transmit a driving force from the motor to the roller, and the drive transmission includes a clutch configured to enable the roller to rotate within a predetermined range of rotation in the sheet feeding direction during an idle condition. Moreover, the sheet feeder includes a return mechanism configured to enable the roller to rotate within the predetermined range of rotation in a direction that is opposite to the sheet feeding direction.