Printer Transport Mechanism Prevents Sheet Pinching During Jam Recovery
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Solution Overview
Problem
In medium transport apparatuses, paper jams can lead to sheets being pinched between movable units and the housing, causing damage and hindering detection, especially when the movable unit is returned to storage position without removing the jammed sheet, resulting in incomplete recovery processes.
Innovation Solution
A recording apparatus with a transport path, a recording section, a transport mechanism, and a control section that executes an additional transport process to discharge the medium to a discharge-side transport path, preventing pinching by moving the medium to a position where it can be safely handled and detected, even if the user fails to remove the jammed medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable unit is drawn out to the drawing-out position to remove jammed paper, then the jammed paper can be removed, but the sheet may hang down and be pinched between the movable unit and the transport mechanism when the movable unit is returned to the storage position
Solution Approach 1:
The transport mechanism performs an additional transport action after detecting a paper jam condition. This preliminary action moves the sheet forward by a predetermined amount before the movable unit is drawn out, ensuring the sheet is positioned safely away from the pinching zone between the movable unit and transport mechanism, thus preventing sheet damage while maintaining easy paper removal access
2Device complexity
If the movable unit is returned to the storage position without removing the jammed sheet, then the sheet may be pinched and crushed, but this causes difficulty in sheet removal and hinders detection by sensors
Solution Approach 1:
The control section monitors the position of sheets in the transport path using sensors. When a paper jam is detected, the control section triggers the additional transport process to move the sheet to a safe position. This feedback mechanism ensures that sheets are properly positioned for both easy removal and reliable sensor detection, preventing crushed sheets that would hinder detection while maintaining simple recovery procedures
3Productivity
If multiple sheets are transported and a preceding sheet is jammed, then the subsequent sheet must be stopped, but returning the movable unit to storage without removing the stopped subsequent sheet causes pinching and damage
Solution Approach 1:
When a paper jam is detected in the transport path, the transport mechanism executes an additional transport action that moves not only the jammed sheet but also any subsequently stopped sheets by a predetermined amount. This preliminary positioning ensures that subsequent sheets are moved away from the pinching zone between the movable unit and transport mechanism, protecting them from damage while maintaining multi-sheet transport efficiency
Data Source
AI summary
A printer including a transport path; a transport mechanism that is disposed in the transport path and transports the medium in a transporting direction caused when printing is executed by a recording section; a discharge-side transport path that forms a part of a downstream side in the transporting direction from the recording section in the transport path and is movable to a position close to the transport mechanism and a position separated from the transport mechanism; and a control section that controls the recording section and the transport mechanism. In a state where a transport failure of the medium occurs in the transport path, in a case where a predetermined condition is satisfied, the control section executes an additional transport process of discharging the medium to the discharge-side transport path by transporting the medium in the transporting direction by a predetermined amount by the transport mechanism.