Sheet Ejecting Device Variable Clamping Speed Alignment
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Solution Overview
Problem
Conventional sheet ejecting devices face alignment issues when stacking sheets, particularly with slippery sheets or multiple overlapped sheets, due to misalignment during the conveying process, especially at high speeds or under varying environmental conditions, leading to creases and improper stacking.
Innovation Solution
A sheet ejecting device with a bumping section and pair of clamping members that can operate in normal or low speed modes based on sheet type, number of sheets, and conveying speed, to enhance alignment without increasing gripping force, using a control section to manage the clamping members' operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gripping force of the gripper is increased to prevent sheets from slipping, then the sheets can be gripped more securely, but creases and folds easily form on the sheets
Solution Approach 1:
The patent changes the operational parameters of the sheet clamping members by introducing variable speed control. Instead of using a fixed high gripping force, the system adjusts the clamping speed based on sheet characteristics (coated sheets, thick sheets, multiple sheets) to achieve reliable gripping without excessive force that causes damage
Solution Approach 2:
The patent makes the clamping system dynamic by enabling speed variation of the sheet clamping members. The control section adjusts the operation speed between normal speed and low speed modes depending on the sheet type and stacking conditions, allowing optimal gripping performance without constant high-force clamping
2Productivity
If the sheet conveying speed is high, then productivity is improved, but sheet alignment becomes misaligned during ejection
Solution Approach 1:
The patent introduces dynamic speed adjustment for the sheet clamping members during the stacking operation. When multiple sheets or slippery sheets are detected, the system automatically reduces the clamping speed to prevent slipping and maintain alignment, while allowing normal high-speed operation for standard sheets
Solution Approach 2:
The control section receives information about sheet characteristics and stacking conditions, then adjusts the clamping speed accordingly. This feedback mechanism allows the system to maintain high productivity for normal sheets while automatically reducing speed when alignment issues are detected or predicted
Data Source
AI summary
Disclosed is a sheet ejecting device. The sheet ejecting device includes a sheet stacking section; a bumping section; a sheet ejecting section; a mode selecting section; and a control section. The sheet ejecting section includes a pair of sheet clamping members which clamps one sheet or a plurality of overlapped sheets at a sheet clamping position and moves the one sheet or the plurality of overlapped sheets to a sheet stacking position in the sheet stacking section. The mode selecting section allows selection of an operation mode of the pair of sheet clamping members between a normal mode in which speed of the pair of sheet clamping members is a normal speed and a low speed mode in which a speed is lower than the normal speed.