Sheet Supply Device Friction Segmentation for Envelope Distortion
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Solution Overview
Problem
Conventional sheet supply devices often cause distortion and paper jamming when supplying envelopes with a pocket-like structure, as the difference in carried amounts between the top and bottom sheets leads to uneven handling and contact with guide rollers.
Innovation Solution
A sheet supply device with a medium loading part and a medium supply part, utilizing a first friction member with a lower friction coefficient and a second friction member with a higher friction coefficient, arranged to minimize distortion by ensuring synchronized handling of envelope sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single friction member with high friction coefficient is used to press sheets against the supply roller, then sheets are accurately supplied one by one, but envelopes experience distortion and paper jamming due to uneven carried amounts between top and bottom sheets
Solution Approach 1:
The single friction member is segmented into two separate friction members: a first friction member with lower friction coefficient positioned upstream, and a second friction member with higher friction coefficient positioned downstream. This segmentation allows different regions to perform different functions - the first member prevents excessive friction that causes distortion, while the second member ensures adequate grip for accurate supply.
Solution Approach 2:
Different friction coefficients are assigned to different locations along the sheet path. The upstream region (first friction member) uses lower friction to minimize distortion, while the downstream region (second friction member) uses higher friction to ensure accurate sheet separation and supply. This local differentiation resolves the contradiction between accurate supply and envelope handling.
2Manufacturing precision
If high friction is applied to the friction member to ensure accurate sheet separation, then sheets are supplied one by one accurately, but the envelope distortion increases causing paper jamming and skew
Solution Approach 1:
The friction application is segmented into two stages with different friction coefficients. The first friction member applies lower friction to minimize distortion during initial contact, while the second friction member applies higher friction to ensure accurate separation. This staged approach prevents the harmful distortion effect while maintaining separation accuracy.
Solution Approach 2:
The first friction member with lower friction coefficient acts as a cushioning element that prevents excessive friction forces from being applied to the envelope early in the contact process. This beforehand cushioning protects the envelope from distortion before the second friction member ensures proper separation.
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 effectively reduces distortion and prevents paper jamming and skew during envelope carriage, allowing for accurate and efficient supply of envelopes with minimal handling issues.
Implementation Method 1
a first friction member that is arranged in a position facing the medium supply part so that the first friction member contacts the medium supply part when there is no medium on the medium loading part
Implementation Method 2
a second friction member that is arranged on an upstream side of the first friction member in the carrying direction, and a friction coefficient (μd) between the second friction member and the medium is larger than a friction coefficient (μc) between the first friction member and the medium
Data Source
AI summary
A sheet supply device includes a medium loading part that includes a medium loading surface on which medium is loaded; and a medium supply part that is arranged facing the medium lading surface, and sandwiches the medium with the medium loading part applying a pressure to the medium, and sends the medium loaded in the medium loading part in a predetermined carrying direction. The medium loading part includes a first friction member arranged in a position facing the medium supply part so that the first friction member contacts the medium supply part when there is no medium on the medium loading part, and a second friction member arranged on an upstream side of the first friction member in the carrying direction, and a friction coefficient (μd) between the second friction member and the medium is larger than a friction coefficient (μc) between the first friction member and the medium.