Adjustable Blanket Roller Shaft for Offset Printing
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Solution Overview
Problem
Existing offset printing machines face inefficiencies due to fixed roller diameters, leading to wasted space and unstable paper tension, which limits printing speed and accuracy.
Innovation Solution
A printing mechanism that allows for interchangeable plate and blanket rollers of different diameters, ensuring continuous printing patterns and stable paper feeding through adjustable shaft positions and elastic locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed outer diameters of plate roller and blanket roller are used, then the structure is simple and easy to manufacture, but the printable circumference cannot be adjusted to match different printed pattern lengths, causing blank spaces and material waste
Solution Approach 1:
The patent implements a dynamic roller system where the blanket roller can be replaced with rollers of different outer diameters to match different printed pattern lengths. The shaft position is made adjustable through an eccentric structure that allows the blanket roller shaft to move radially, enabling the printable circumference to be dynamically adapted to different printing requirements without changing the basic roller structure.
Solution Approach 2:
The patent changes the key parameter of roller outer diameter to adapt to different printing needs. By providing a set of blanket rollers with different outer diameters and enabling shaft position adjustment, the system can match the printable circumference to the printed pattern length, eliminating blank spaces and material waste while maintaining a relatively simple replacement mechanism.
2Productivity
If back-and-forth intermittent printing method with notches is used, then blank spaces can be eliminated, but the printing speed cannot be increased and paper tension becomes unstable causing tensile deformation
Solution Approach 1:
The patent transitions from intermittent back-and-forth printing to continuous printing by making the blanket roller shaft position adjustable. This allows the system to maintain continuous forward motion while adapting the printable circumference to match the printed pattern length, thereby increasing printing speed and maintaining stable paper tension throughout the printing process.
Solution Approach 2:
The patent enables continuous printing action by eliminating the need for back-and-forth motion and notches. The adjustable shaft position allows the blanket roller to continuously print forward at matched circumferences, maintaining constant paper tension and enabling sustained high-speed printing without interruption or deformation.
3Loss of substance
If larger blank spaces are generated between printed patterns, then the printable circumference exceeds the pattern length, but this causes material waste and reduced printing efficiency
Solution Approach 1:
The patent changes the outer diameter parameter of the blanket roller to match different printed pattern lengths. By selecting or adjusting the roller diameter, the printable circumference is optimized to match the pattern length exactly, eliminating blank spaces and maximizing roll paper utilization while maintaining high printing efficiency.
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
This solution enhances printing speed and efficiency by eliminating blank spaces and maintaining stable paper tension, resulting in improved accuracy and utilization of roll paper.
Implementation Method 1
an elastic layer is provided in an inner hole of the roller and a gas hole is provided on the shaft. The gas hole is controlled to blow gas by a gas source and a gas valve. When the roller is sleeved on the shaft, the gas is blown by the gas hole to open up the elastic layer in the inner hole of the roller.
Data Source
Figure 1
Figure 2~3
AI summary
A printing mechanism of an offset printing machine includes a plating roller (1), a transferring roller (4), and an imprinting roller (2). The plating roller (1) is sleeved on a plate shaft (16). The transferring roller (4) is sleeved on a transfer shaft (21). The imprinting roller (2) is rotatably provided on a machine frame (3). The plating roller (1) is correspondingly matched with the transferring roller (4). The plating roller (1) and the transferring roller (4) maintain to abut and roll against each other. The plate shaft (16) is rotatably provided on the machine frame (3). The transfer shaft (21) is provided to rotate around an axis thereof. The position of the axis of the transfer shaft (21) on a transfer shaft running trajectory (40) is adjustable. When transferring rollers (4) of different outer diameters are selected, the position of the axis of the transfer shaft (21) on the transfer shaft running trajectory (40) is adjusted, so that each of the transferring rollers (4) of the different outer diameters maintains to abut and roll against the imprinting roller (2). The printing mechanism of the offset printing machine may use plating rollers and transferring rollers of different outer diameters, improting printing speed and efficiency, and improving printing accuracy.