Sheet Conveyer Sensor Positioning to Prevent Dust Adherence
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Solution Overview
Problem
The accuracy of sheet conveyer systems is compromised due to paper dust produced by friction, which adheres to the emitter and receiver of the multiple sheet sensor, affecting the detection of multiple sheets.
Innovation Solution
A sheet conveyer configuration with a first roller, separator, multiple sheet sensor, and second roller, where at least one of the emitter or receiver is positioned on the outer side relative to the separator and inner side relative to the second roller, preventing dust adherence and ensuring accurate detection of multiple sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the multiple sheet sensor is arranged in the sheet conveyer path to detect presence of multiple sheets, then the detection function is provided, but paper dust produced by friction adheres to the emitter and receiver, lowering detection accuracy
Solution Approach 1:
The patent positions the emitter and receiver in the widthwise direction (lateral dimension) rather than only in the conveying direction. Specifically, at least one of the emitter or receiver is arranged on the outer side of the separator along the widthwise direction, and at least part of it is arranged on the inner side of the second roller along the widthwise direction. This spatial repositioning in a different dimension removes the sensor components from the dust generation zone while maintaining detection capability.
2Ease of operation
If the separator nips the sheet in cooperation with the first roller to separate the sheet from other sheets, then sheet separation is achieved, but friction between sheets and separator produces dust that travels downstream
Solution Approach 1:
The patent extracts the emitter and receiver from the dust generation environment created by the separator-sheets friction. By positioning at least one of these components on the outer side of the separator and/or inner side of the second roller, the sensor elements are removed from the harmful zone where dust is generated and transported, thereby preventing dust adherence while maintaining the sheet separation function.
Data Source
AI summary
A sheet conveyer, including a first roller to rotate to convey a sheet in a conveying direction; a separator arranged to be opposed to the first roller and configured to nip the sheet and to separate the sheet from other sheets; a multiple sheet sensor arranged in a downstream position with respect to the first roller and configured to sense presence of multiple sheets, the multiple sheet sensor including an emitter and a receiver; and a second roller arranged in a downstream position with respect to the multiple sheet sensor and configured to convey the separated sheet, is provided. A component being at least one of the emitter and the receiver is arranged in an outer side position with respect to the separator, and at least a part of the component is arranged in an inner side position with respect to the second roller.