Image Forming Device Driving Force Transmission Mechanism for Jammed Sheet Removal
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Solution Overview
Problem
In facsimile devices, when sheet jamming occurs, users face difficulties in removing jammed documents or sheets due to the constraints imposed by feeding rollers, which can lead to damage and hinder the resolution of the jamming issue, especially when attempting to pull the sheet in the upstream direction.
Innovation Solution
An image forming device with a driving force transmission mechanism that includes a single drive motor, a document feeder, a recording sheet feeder, and a control unit capable of switching power transmission between different operation modes, allowing for the disconnection of the document feeder when the recording sheet feeder is engaged, enabling the user to remove jammed sheets by changing the transmission phase upon detection of interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving force transmission mechanism maintains continuous connection to feeding rollers during jamming, then the rollers can maintain feeding function, but the user cannot remove jammed sheets due to roller constraints
Solution Approach 1:
The patent applies the dynamics principle by making the driving force transmission mechanism switchable between connected and disconnected states. The transmission mechanism can dynamically change its connection state to the feeding rollers based on operational needs - connected during normal feeding and disconnected during jamming removal, allowing both feeding function and easy sheet removal
Solution Approach 2:
The patent segments the driving force transmission path into controllable sections. By selectively disconnecting the transmission mechanism from specific feeding rollers while maintaining connection to others, the system allows independent control of each transmission path, enabling jammed sheets to be removed without affecting other feeding functions
2Productivity
If the transmission mechanism switches between operation modes, then the correct rollers are driven for each mode, but jammed sheets cannot be removed due to continuous driving connection
Solution Approach 1:
The patent makes the transmission mechanism dynamic by enabling it to switch between connected and disconnected states based on the operational phase. During normal operation, the mechanism is connected for efficient roller driving; during jamming removal, it disconnects to allow free sheet extraction, thus adapting to different operational requirements
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 the user to safely and effectively remove jammed sheets by switching the power transmission mode, preventing damage and facilitating the resolution of jamming issues without additional components or complex operations, thus enhancing the device's operability and reducing costs.
Implementation Method 1
The rotary member 45 is selectively connected to the sun gear 43 through a one-way clutch (not shown)
Implementation Method 2
The two planetary gears 46 and 47 are provided at predetermined positions on the surface of the rotary member 45 facing the sun gear 43 so as to be in meshing engagement with the small diameter gear 43B of the sun gear 43
Implementation Method 3
the document or the recording sheet will be constrained by the feeding roller, making it impossible to deal with the jamming
Data Source
AI summary
An image forming device providing a document image reading mode, image recording mode, copying mode, recording sheet feeding mode, and recording sheet discharge mode. When interruption of feeding of a document or a recording sheet is detected by a sensor, the current driving force transmission path is switched and set to another driving force transmission path corresponding to an operation mode different from the current operation mode at which the interruption occurs.