Sheet Feeding Device With Narrow Upstream Suction for Long-Sheet Separation
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Solution Overview
Problem
Existing sheet feeding devices face issues with separation defects, particularly when feeding long sheets or sheets with high adhesion, as air flow from the blower may not reach the trailing end of the sheet, leading to separation failures.
Innovation Solution
A sheet feeding device with a sheet supporting portion, air blowing portion, feeding belt, and upstream suction portion, where the feeding belt includes a first suction area and an upstream suction portion with a narrower second suction area, configured to effectively separate and feed sheets by controlling air flow and suction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air blowing portion blows air toward upstream end from downstream end to separate sheets, then sheet separation is improved, but air flow may not reach trailing end of long sheets causing separation defects
Solution Approach 1:
The suction function is segmented into two distinct areas: a first suction area located downstream and a second suction area located upstream. This segmentation allows the system to address different regions of the sheet independently, ensuring that air flow and suction forces are effectively applied throughout the entire sheet length, including the trailing end that was previously unreachable.
Solution Approach 2:
The invention extends the suction function from a single downstream location to include both downstream (first suction area) and upstream (second suction area) positions. This spatial extension in the sheet feeding direction ensures comprehensive coverage of the sheet, allowing air flow to be effectively utilized across the entire sheet length and preventing separation defects at the trailing end.
2Device complexity
If feeding belt uses single suction area to suck uppermost sheet, then device complexity is reduced, but sheet separation effectiveness deteriorates for long sheets
Solution Approach 1:
The suction function is divided into two distinct suction areas: a first suction area on the feeding belt and a second suction area on the upstream suction portion. This segmentation enables targeted suction at different locations, improving sheet separation reliability for long sheets while maintaining a relatively simple overall device structure through functional division.
Solution Approach 2:
The upstream suction portion acts as an intermediary element that complements the feeding belt's suction function. By introducing this additional suction component upstream, the system achieves better sheet separation control without requiring complete redesign of the existing feeding mechanism, thus balancing reliability improvement with device complexity management.
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
The solution enhances sheet separation by ensuring consistent air flow from the leading to the trailing end, reducing separation defects and improving the feeding process for various sheet types and conditions.
Implementation Method 1
an air blowing portion configured to blow an air toward an upstream end from a downstream end of the sheets supported by the sheet supporting portion in a sheet feeding direction
Implementation Method 2
a feeding belt configured to feed and suck the uppermost sheet of the sheets to which the air is blown by the air blowing portion; and an upstream suction portion disposed upstream of the feeding belt in the sheet feeding direction and configured to suck the uppermost sheet
Data Source
AI summary
A sheet feeding device includes a supporting portion supporting sheets, an air blower blowing an air toward an upstream end from a downstream end of the sheets supported by the sheet supporting portion in a sheet feeding direction, a belt feeding and sucking the uppermost sheet of the sheets to which the air is blown by the air blower, and an upstream suction portion disposed upstream of the feeding belt in the sheet feeding direction and sucking the uppermost sheet. The belt includes a first suction area opposing the uppermost sheet and sucking the uppermost sheet. The upstream suction portion includes a second suction area opposing the uppermost sheet and sucking the uppermost sheet. In a widthwise direction perpendicular to the sheet feeding direction, a width of the second suction area is narrower than a width of the first suction area.