Paper Transport Guide Surface Layout to Suppress Rear-End Bouncing
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Solution Overview
Problem
Existing transport devices generate a bouncing sound when the rear end of a recording medium disengages from a guide surface that is separated from the transporting roller and has a constant shape in the axial direction, leading to potential damage and noise.
Innovation Solution
The transport device incorporates a guide member with a guide surface that extends to the downstream side in the transport direction, with the leading end positioned on the second roller side relative to the nip line, and includes an inclined surface to guide the rear end corner portion, reducing the bouncing sound and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the guide member is separated from the transporting roller and the guide surface has a constant shape in the axial direction, then the device structure is simple, but a bouncing sound is generated when the rear end of the recording medium disengages from the guide surface
Solution Approach 1:
The guide surface is designed to be non-constant in the axial direction, with the separation portion extending further downstream than the overlapping portion. This dynamic variation in the guide surface shape allows the rear end of the recording medium to be guided smoothly as it disengages, preventing bouncing sound while maintaining structural simplicity
Solution Approach 2:
Different portions of the guide member have different guide surface characteristics: the overlapping portion guides the front end of the recording medium, while the separation portion extends further to guide the rear end. This localized differentiation in guide surface shape addresses the bouncing sound problem at the rear end without complicating the overall structure
2Ease of manufacture
If the guide surface is constant in the axial direction, then manufacturing is easier, but the rear end corner of the recording medium may be damaged due to bouncing
Solution Approach 1:
The guide surface varies in the axial direction with the separation portion extending further downstream than the overlapping portion. This dynamic design ensures the rear end corner of the recording medium is properly supported during disengagement, preventing damage while remaining manufacturable
Solution Approach 2:
The guide surface is designed in advance with the separation portion extending further downstream, so that the rear end of the recording medium is already positioned correctly before it fully disengages from the transporting roller. This preliminary positioning prevents sudden bouncing and potential damage
Data Source
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AI summary
A transport device includes a transporting roller that includes a first shaft portion, a first roller configured to have plural cylindrical first roller portions into which the first shaft portion is inserted and which are separated from each other in an axial direction of the first shaft portion, and a second roller coming into contact with the first roller and extends in a direction of the first shaft portion, and that transports a recording medium; and a guide member that is disposed on a first roller side with respect to a transport path of the recording medium and that is formed with a guide surface guiding the recording medium toward the transporting roller while changing a transport direction of the recording medium to be transported, the guide surface of a separation portion which is separated from the first roller in the axial direction extending to a downstream side in the transport direction as compared with the guide surface of an overlapping portion which overlaps the first roller in the axial direction.