Gripper Control for Media Misfeed in Image Forming Apparatus
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Solution Overview
Problem
Image forming apparatuses, such as liquid electrophotography printing systems, face issues with media misfeed and skewing due to insufficient gripping by gripper units, leading to damage to the image transfer blanket, increased cost per page, and downtime.
Innovation Solution
The apparatus includes a gripping device with gripper units and a scanning device equipped with sensors to detect media length and orientation, a determination module to assess gripping sufficiency, and a control module to initiate recovery actions, thereby preventing media misfeed and reducing damage to the image transfer blanket.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If gripper units are used to grip media, then media transport is enabled, but media misfeed and skewing occur due to insufficient gripping
Solution Approach 1:
The patent implements a feedback mechanism where sensors detect media position and the control system adjusts gripper unit activation accordingly. The system monitors media feed status and dynamically controls which gripper units are activated to ensure adequate gripping force, preventing both insufficient gripping and media damage.
Solution Approach 2:
The patent employs dynamic control of gripper units, where the activation and deactivation of individual gripper units is adjusted in real-time based on media position and feed status. This dynamic adjustment allows the system to optimize gripping force distribution along the media length, adapting to varying media conditions.
2Productivity
If impression roller rotates to transport media, then image transfer is enabled, but damage to image transfer blanket occurs due to media misfeed
Solution Approach 1:
The patent implements preliminary detection of media position and feed status before the impression roller completes its rotation for image transfer. The control system activates or deactivates gripper units in advance to ensure proper media positioning, preventing media misfeed and subsequent damage to the image transfer blanket during the transfer process.
Solution Approach 2:
The patent introduces sensors and a control system as intermediaries between the media feed mechanism and the impression roller. These intermediaries detect media status and coordinate gripper unit activation to ensure media is properly positioned before image transfer, preventing blanket damage while maintaining transfer productivity.
3Reliability
If sensors detect media position, then media misfeed is prevented, but device complexity increases
Solution Approach 1:
The patent divides the media detection function into multiple sensors positioned at different locations along the media path. Each sensor detects specific aspects of media position or status, and the control system processes these segmented detection signals to make coordinated decisions about gripper unit activation, distributing the detection complexity across multiple simple sensor elements.
Data Source
AI summary
Image forming apparatus and methods are disclosed which include an intermediate transfer member to transfer images to media, an impression roller including a gripping device to receive the media, and a determination module to determine the length of the media held by the at least one gripper unit based on respective detections by first and second set of sensors.