Recording Apparatus Roller Pair Jam Discharge
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Solution Overview
Problem
In recording apparatuses, when a sheet is jammed between the transport roller pair and the first roller pair, the existing configuration makes it difficult to perform appropriate return processing as the transport roller pair tries to send the sheet in the second transport direction, while the first roller pair attempts to discharge it in the first direction, leading to an inability to send the sheet outside the apparatus effectively.
Innovation Solution
The recording apparatus includes a first roller pair that can rotate in both forward and reverse directions, with a stronger transport force when rotating forward, and a second roller pair that only rotates forward, sharing a common drive source, allowing the first roller pair to overpower the second roller pair and discharge the sheet effectively, even if it's nipped between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first roller pair and the transport roller pair are driven by a common motor, then the cost of the apparatus is reduced, but when a sheet is jammed between them, the transport roller pair tries to send the sheet in the second transport direction while the first roller pair attempts to discharge it in the first direction, making it difficult to perform appropriate return processing
Solution Approach 1:
The patent changes the rotational direction parameter of the first roller pair independently from the transport roller pair. By enabling the first roller pair to rotate in reverse direction while the transport roller pair maintains forward rotation, the system resolves the jammed sheet discharge problem while keeping the common motor configuration for cost efficiency
2Productivity
If the transport roller pair rotates in the direction to transport sheet in the second transport direction regardless of the rotation direction of the first roller pair, then two sheets can be transported inside the apparatus to improve throughput, but when a sheet is stopped in a state where it is nipped between the transport roller pair and the first roller pair, the sheet cannot be sent in the direction toward the outside of the apparatus
Solution Approach 1:
The patent introduces dynamic control of the first roller pair's rotation direction. The first roller pair can switch between forward and reverse rotation directions depending on the operational state, allowing it to discharge sheets during return processing while the transport roller pair maintains consistent forward rotation for dual-sheet throughput
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 the sheet to be successfully discharged from the apparatus during return processing, even when jammed, by ensuring the first roller pair's forward rotation can overcome the second roller pair's transport force, facilitating appropriate return processing.
Implementation Method 1
a first roller pair that includes a first drive roller that may rotate in a forward rotation direction in which the medium transported in the first direction on the first medium transport path is sent toward a discharge port and in a reverse rotation direction opposite to the forward rotation direction, and a first driven roller that nips the medium with the first drive roller
Implementation Method 2
a second drive roller that is provided in the third medium transport path and may rotate only in the forward rotation direction for sending the medium toward the reverse path, and a second driven roller that nips the medium with the second drive roller
Implementation Method 3
a transport force applied to the medium by the first roller pair when the first drive roller rotates in the forward rotation direction is stronger than a transport force applied to the medium by the second roller pair when the second drive roller rotates in the forward rotation direction
Data Source
AI summary
A recording apparatus includes a first medium transport path, a reverse path for reversing a surface of a medium, a third medium transport path that guides the medium to the reverse path, a first drive roller configured to rotate in a forward rotation direction that sends the medium toward a discharge port and in a reverse rotation direction opposite to the forward rotation direction, and a second drive roller provided in the third medium transport path and configured to rotate only in the forward rotation direction for sending the medium toward the reverse path, in which a transport force applied to the medium by the first drive roller when the first drive roller rotates in the forward rotation direction is stronger than a transport force applied to the medium by the second drive roller when the second drive roller rotates in the forward rotation direction.