Sheet Stacking Apparatus Dual Belt Alignment
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Solution Overview
Problem
Existing sheet stacking apparatuses face alignment issues due to insufficient or excessive conveyance force, particularly when handling various types of sheets with different weights and materials, leading to potential misalignment or bending.
Innovation Solution
A sheet stacking apparatus with a dual conveyance system, comprising a drawing belt and an assist belt, where the assist belt can be retracted or engaged to adjust the conveyance force based on sheet characteristics, allowing for precise alignment by switching between different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conveyance force that the knurled belt applies to the sheet is increased to prevent misalignment, then alignment reliability is improved, but the sheet may bend or buckle due to excessive conveyance force
Solution Approach 1:
The conveyance force is segmented into two independent sources: a first conveyance member (knurled belt) and a second conveyance member (smooth belt). This allows the total conveyance force to be divided and controlled separately, preventing excessive force from a single source that would cause sheet bending while maintaining sufficient force for reliable alignment.
Solution Approach 2:
The invention changes the surface parameter of the second conveyance member to be smooth rather than knurled, creating a differential in conveyance characteristics. The smooth surface provides gentler contact that reduces the risk of bending, while the knurled first member provides the primary alignment force. This parameter differentiation allows simultaneous achievement of reliable alignment and sheet shape preservation.
2Shape
If the conveyance force is decreased to prevent sheet bending, then sheet shape is preserved, but alignment may fail due to insufficient conveyance force
Solution Approach 1:
The conveyance function is segmented between two members with different characteristics. The first conveyance member (knurled belt) provides strong conveyance force for reliable alignment, while the second conveyance member (smooth belt) provides supplementary gentle force that prevents bending. This segmentation allows the system to achieve both alignment reliability and shape preservation simultaneously.
Solution Approach 2:
The conveyance system uses a composite approach with two different belt surfaces (knurled and smooth) working together. This composite conveyance mechanism combines the high-friction advantage of knurled surfaces for reliable alignment with the low-friction advantage of smooth surfaces for gentle sheet handling, achieving both alignment reliability and shape preservation.
3Device complexity
If a single conveyance member is used to handle all sheet types, then device complexity is reduced, but adaptability to various sheet types deteriorates
Solution Approach 1:
The second conveyance member with a smooth surface serves multiple functions: it provides supplementary conveyance force for heavy sheets, prevents bending for delicate sheets, and can be retracted when not needed. This single smooth belt component achieves multi-functionality that enhances adaptability to various sheet types without proportionally increasing device complexity.
Solution Approach 2:
The second conveyance member is designed to be movable between a retracted position and a contact position, allowing dynamic adjustment of the conveyance system configuration. This dynamic capability enables the system to adapt to different sheet types by engaging or disengaging the smooth belt as needed, enhancing versatility without requiring a completely separate system for each sheet type.
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 dual conveyance system ensures reliable alignment for a wide range of sheet types by dynamically adjusting the conveyance force, preventing misalignment and bending, and improving the stacking process efficiency.
Implementation Method 1
a first conveyance member configured to contact the sheet stacked on the stacking portion and apply conveyance force to the sheet for moving the leading edge of the sheet toward the abutting portion
Implementation Method 2
a second conveyance member configured to contact the sheet stacked on the stacking portion and apply conveyance force to the sheet for moving the leading edge of the sheet toward the abutting portion
Data Source
AI summary
A sheet stacking apparatus includes a stacking portion, a conveyance portion configured to convey the sheet toward the stacking portion, an abutting portion against which a leading edge of the sheet in the sheet conveyance direction is abutted, a first conveyance member, a second conveyance member movable to a contact position at which the second conveyance member contacts the sheet stacked on the stacking portion and to a retracted position to which the second conveyance member is retracted from the sheet stacked on the stacking portion, and a control portion configured to execute a first mode in which the second conveyance member is positioned at the contact position and a second mode in which the second conveyance member is positioned at the retracted position.