Sheet Feeding Device Widthwise Position Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet feeding devices with side registration type mechanisms face productivity issues due to variations in sheet position relative to the feeding direction, leading to inconsistent timing in reaching downstream roller pairs.
Innovation Solution
A sheet feeding device is designed with a first feeding roller pair movable in the sheet's widthwise direction, a reference member, an obliquely feeding roller, and detecting means to correct oblique movement by precisely positioning the sheet before oblique feeding, thereby improving productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the side end portion of the sheet starts to abut against the reference member at different positions, then the feeding distance varies, but the timing when the sheet reaches the downstream roller pair becomes inconsistent, reducing productivity
Solution Approach 1:
The patent applies preliminary action by detecting the sheet's widthwise position before oblique feeding starts, and pre-positioning the first feeding roller pair in the widthwise direction based on the detected position. This preliminary positioning ensures that the sheet abuts against the reference member at a consistent position, eliminating timing variations and improving productivity without compromising the ease of oblique movement correction
2Adaptability or versatility
If the sheet position in the widthwise direction varies before oblique feeding, then the feeding distance changes, but the timing variation requires increased interval between sheets
Solution Approach 1:
The patent implements feedback by using detecting means to continuously monitor the sheet's widthwise position, and the controller adjusts the position of the first feeding roller pair based on the detected position. This closed-loop feedback system ensures consistent sheet positioning despite initial variations, eliminating the need for increased intervals between sheets and reducing time loss
3Ease of operation
If the obliquely feeding roller feeds the sheet for a long distance while slipping, then the sheet reaches the downstream roller pair later, but the timing becomes inconsistent with sheets fed from different positions
Solution Approach 1:
The patent applies preliminary action by pre-positioning the first feeding roller pair in the widthwise direction based on the detected sheet position before oblique feeding starts. This ensures that regardless of the initial sheet position, the sheet abuts against the reference member at a consistent position, standardizing the feeding distance and timing, and improving timing precision without compromising the oblique feeding mechanism
Data Source
AI summary
A sheet feeding device includes a first feeding roller pair, a reference member, an obliquely feeding roller, a second feeding roller pair, a detecting portion, and a controller. Before a sheet is obliquely fed by the obliquely feeding roller, the controller causes the first feeding roller to move the sheet to a predetermined position in a widthwise direction of the sheet on the basis of a detection result of the detecting means.