Printer Sheet Feed Timing Control for Jam Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional image formation devices, such as printers, face inefficiencies when feeding sheets of varying sizes, as they often default to the maximum sheet size for timing control, leading to unnecessary processing time when smaller sheets are used, resulting in prolonged processing times and potential jamming or image blurring.
Innovation Solution
An improved image formation device with a sheet accommodation unit, image formation unit, sheet feed mechanism, and control unit that measures sheet length and adjusts the sheet feed distance based on the detected size, ensuring accurate spacing and preventing overlap or jamming by maintaining a predetermined sheet distance between sheets, even when the user does not designate the sheet size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If timing control is executed based on maximum sheet size when sheet size is not designated, then all sheet types can be processed, but processing time is unnecessarily prolonged when smaller sheets are used
Solution Approach 1:
The sheet detection unit detects the presence and position of sheets in advance before the image formation unit processes them. This preliminary detection allows the control unit to determine actual sheet size early in the process, enabling subsequent timing control to be optimized for the specific sheet size rather than always using the maximum size assumption, thus reducing unnecessary waiting time while maintaining compatibility with all sheet types.
Solution Approach 2:
The system dynamically adjusts the sheet feed timing based on the detected sheet size. Instead of using a fixed timing control based on maximum sheet size, the control unit modifies the feed intervals and timing parameters according to the actual sheet dimensions detected by the sheet detection unit, allowing optimal processing speed for each sheet type.
2Device complexity
If sheet feed distance is fixed based on maximum sheet size, then sheet positioning is simplified, but sheet overlap or jamming occurs when smaller sheets are used
Solution Approach 1:
The sheet detection unit performs preliminary detection of sheet presence and position before the feed mechanism operates. This advance information allows the control unit to calculate and set the appropriate feed distance for the specific sheet size, preventing overlap and jamming without requiring complex real-time adjustment mechanisms during the feeding process.
Solution Approach 2:
The system uses feedback from the sheet detection unit to continuously monitor sheet position and size, and the control unit adjusts the feed distance accordingly. This closed-loop control ensures that the feed mechanism maintains appropriate spacing between sheets of varying sizes, preventing jamming while keeping the overall system relatively simple.
3Measurement precision
If sheet size measurement is performed for each sheet, then accurate timing control is achieved, but processing overhead increases
Solution Approach 1:
The sheet detection unit serves multiple functions: it detects sheet presence, determines sheet size, and provides positioning information. By consolidating these detection capabilities into a single multi-functional unit rather than separate measurement systems, the system achieves accurate sheet size measurement without proportionally increasing processing overhead, as the same detection infrastructure handles multiple tasks simultaneously.
Data Source
AI summary
An image formation device is configured such that a length of a sheet feed path from a sheet accommodation unit to a sheet detection unit is greater than the sheet distance for a predetermined type sheet that has substantially the same sheet length as a maximum size sheet employable in the image formation unit. A sheet length of the sheet fed by the sheet feed mechanism is measured. If the sheet length of a firstly fed sheet, which is fed in response to an image formation instruction and measured by the measuring unit, is equal to the sheet length of the predetermined type of sheet, the control unit feeds a subsequent sheet with the sheet distance corresponding for the maximum size sheet between a trailing end of the previously fed sheet and the leading end of the subsequent sheet.