Sheet Feeding Unit With Conveyor System For Printing Press
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Solution Overview
Problem
Existing sheet-fed printing presses face challenges with complex and inefficient sheet feeding systems that result in multiple acceleration and deceleration processes, directional changes, and errors in sheet transport, leading to increased costs, reduced quality, and operational complexity.
Innovation Solution
A modular feed unit with a conveyor system comprising endless conveyor chains and gripper systems that directly feed sheets from a suction head to a feed table, allowing for precise alignment and positioning using sheet position sensors, eliminating the need for multiple drums and complex air supply systems, and enabling improved sheet guidance and reduced waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional sheet feeders with multiple drums and complex conveying paths are used, then sheet feeding capability is achieved, but device complexity increases and sheet transport accuracy deteriorates due to multiple acceleration and deceleration processes
Solution Approach 1:
The patent merges multiple drum functions into a single drum design. The sheet feeder comprises one drum with first and second gripper systems that perform multiple conveying functions, eliminating the need for separate drums and reducing the overall number of components in the sheet feeding mechanism.
Solution Approach 2:
The single drum is designed to perform multiple functions: it holds stacks of sheets, separates individual sheets using a suction head, positions sheets using guide elements, and transfers sheets to the printing cylinder. The first and second gripper systems on the same drum handle different stages of sheet transfer, making the drum a universal component for sheet handling.
2Productivity
If multiple gripper systems are distributed across separate drums, then sheet transfer capability is maintained, but sheet transport time increases due to multiple transfer stages
Solution Approach 1:
The patent combines multiple gripper systems onto a single rotating drum, allowing simultaneous access to multiple sheet stacks and direct transfer to the printing cylinder. This eliminates intermediate transfer stages and reduces the time sheets spend in the feeding mechanism.
Solution Approach 2:
The single drum with multiple gripper systems enables continuous sheet feeding operation. While one gripper system transfers sheets, another can be preparing the next sheet, creating a continuous flow without interruption or waiting time between transfer stages.
3Manufacturing precision
If conventional sheet feeders with shingle stream conveying are used, then sheet feeding is achieved, but sheet alignment precision deteriorates due to substrate decelerations and accelerations
Solution Approach 1:
The patent extracts and eliminates the complex shingle stream conveying mechanism with its multiple suction belts and guide elements. Instead, sheets are separated one by one by a suction head and transferred directly by gripper systems, removing the problematic intermediate conveying stage that caused alignment issues.
Solution Approach 2:
Rather than conveying sheets through a complex path with multiple direction changes, the invention inverts the approach by having gripper systems actively grasp and transport sheets in a straight line from the stack to the printing cylinder, minimizing directional changes and maintaining sheet stability.
4Adaptability or versatility
If standard feeders are used for paper processing, then paper feeding is achieved, but adaptability to cardboard processing deteriorates, requiring complete feeder replacement
Solution Approach 1:
The sheet feeder is designed as a universal system that can handle both paper and cardboard substrates. The single drum with adjustable gripper systems and guide elements can accommodate different substrate thicknesses and rigidities, eliminating the need for separate feeders for different material types.
Solution Approach 2:
The feeder incorporates adjustable and movable components, including guide elements that can be positioned to accommodate different substrate thicknesses and gripper systems that can adjust their closing force. This dynamic adaptability allows the same feeder to optimize performance for both flexible paper and rigid cardboard without requiring structural changes.
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 simplifies sheet feeding, reduces waste, enhances throughput, and improves sheet guidance, particularly for cardboard, by minimizing directional changes and accelerations, leading to more efficient and cost-effective operation with fewer mechanical components and reduced operator intervention.
Implementation Method 1
a suction head (13) for sheet singulation and conveyance of the sheets singulated from the stack onto the feed table (2)
Implementation Method 2
The conveyor system (11) has rows of gripper-carrying gripper systems (8), which are moved by a transport drive via conveyor chains (23)
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A feeding unit for a sheet-fed rotary printing press comprises one or more printing units (D1, D2) and/or inking modules. Said printing unit/s and/or inking module/s is/are fitted with a substructure consisting of double-size transfer drums (4) and impression cylinders (5). The feeding unit is provided with a sheet feeder (1), a conveying unit and a feeding table (2) and includes a single-size or double-size feeding drum (3.2) which is associated with a sheet-guiding drum of a first printing unit (D1) of the sheet-fed rotary printing press. In order to improve handling, the conveying unit is designed as an endless conveyor system (11) that connects the lower feeding drum (3.2) to an upper feeding drum (3.1). The upper feeding drum (3.1) is associated with the sheet feeder (1).