Wet sheet dispensing device
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Solution Overview
Problem
Existing wet sheet dispensing devices face issues with sheet drying in standby state and are limited by the interval between cutting lines, requiring larger casings and failing to handle various sheet lengths effectively.
Innovation Solution
A wet sheet dispensing device with a sheet feeding mechanism that includes a driving and driven roller pair, a cutting line detecting sensor upstream, and a sheet detecting sensor downstream, controlling motor operation to ensure the cutting line is always downstream of the roller contact point, preventing sheet projection and drying, and accommodating various sheet lengths without increasing casing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the cutting line detecting sensor is provided below the driving roller, then the device structure is simplified, but the cutting line openings fail to open properly and detection accuracy decreases
Solution Approach 1:
The patent inverts the conventional sensor arrangement by placing the cutting line detecting sensor above the driving roller instead of below it. This inversion allows the sensor to detect cutting lines before they reach the roller contact point, ensuring proper opening of the cutting line perforations and accurate detection while maintaining a relatively simple device structure.
2Speed
If the motor is stopped immediately after detecting the cutting line, then the sheet feeding speed is improved, but the cutting line position becomes unstable and may not be downstream of the roller contact point
Solution Approach 1:
The patent applies preliminary action by stopping the motor in advance before the cutting line reaches the roller contact point. The control unit calculates the appropriate stopping timing based on the detected cutting line position and sheet feeding speed, ensuring that the cutting line is positioned downstream of the roller contact point with a predetermined distance, thereby achieving both fast feeding and stable positioning.
3Ease of operation
If the wet sheet is transferred to a receiving tray at the outlet, then the user can easily pick up the sheet, but the hand may touch the receiving tray causing hygiene concerns
Solution Approach 1:
The patent extracts the wet sheet from the bag body and transfers it to a dispensing location above the outlet without using a receiving tray. The sheet is fed out through the sheet feeding mechanism and dispensed directly at the outlet, allowing users to pick up the sheet without touching any intermediate surfaces, thereby eliminating hygiene contamination risks while maintaining ease of operation.
4Object-affected harmful factors
If a rolled wet sheet with cutting lines is used, then sheet drying is prevented and hygiene is improved, but the device must accommodate various sheet lengths which increases device complexity
Solution Approach 1:
The patent employs feedback control by using the cutting line detecting sensor to monitor the position of cutting lines on the rolled wet sheet. The control unit receives detection signals and automatically adjusts the motor stopping timing to ensure the correct amount of sheet is fed out, regardless of variations in sheet length. This feedback mechanism simplifies the overall device complexity while effectively preventing sheet drying and maintaining hygiene.
Data Source
AI summary
A wet sheet with a predetermined length is securely provided while drying is prevented. When a motor control part receives a detection signal from a hand hovering sensor, a motor is driven from a standby state to rotate a driving roller. When a cutting line is detected by a cutting line detecting sensor, the driving of the motor is continued until a predetermined time set beforehand in which the detected cutting line reaches the side downstream of a contact point between the driving roller and a driven roller in terms of the feeding direction has elapsed, to be stopped. The detected cutting line is located downstream of the contact point between the driving roller and the driven roller in terms of the feeding direction. In front of the detected cutting line, the wet sheet for one sheet is present and is detected by the sheet detecting sensor.