Intermittent Printing Apparatus Guide Roller Winding Angle
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Solution Overview
Problem
Intermittent printing apparatuses experience deviations in printing registration, particularly when using films as base materials, due to slipping between the impression cylinder and the base material, leading to misregistration and potential damage during the printing process.
Innovation Solution
The apparatus incorporates a guide roller to wind the base material at a prescribed angle around the impression cylinder, increasing frictional force and preventing slipping, along with a registration adjusting device to adjust the traveling path length between printing units, and a drying device to fix ink, ensuring accurate printing without registration deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base material is wound around the impression cylinder to prevent movement during backward travel, then the deviation and looseness are prevented, but the frictional force between the impression cylinder and base material is insufficient, causing slipping and printing registration deviation
Solution Approach 1:
A guide roller is introduced as an intermediary component between the base material and the impression cylinder. The guide roller winds the base material at a prescribed angle to increase frictional force, preventing slipping while the base material remains wound around the impression cylinder to maintain positioning stability during backward travel.
Solution Approach 2:
The guide roller changes the winding angle parameter of the base material around the impression cylinder. By optimizing this angle, the frictional force between the base material and the impression cylinder is increased, preventing slipping and ensuring accurate printing registration while maintaining the base material's secured position during backward movement.
2Ease of operation
If the base material passes through a gap between the blanket cylinder and impression cylinder during backward travel, then the base material is not held and movement is unrestricted, but this causes deviation and looseness in the base material
Solution Approach 1:
The guide roller performs a preliminary action by winding the base material at a prescribed angle around the impression cylinder before the printing process. This preliminary winding increases frictional force and secures the base material's position, preventing deviation and looseness during backward travel through the gap between the blanket cylinder and impression cylinder.
3Manufacturing precision
If the frictional force between the impression cylinder and base material is increased by winding at a prescribed angle, then slipping is prevented, but additional components like guide rollers increase device complexity
Solution Approach 1:
Instead of adding complex mechanical engagement mechanisms, the solution changes the winding angle parameter of the base material around the impression cylinder. This parameter change increases frictional force sufficiently to prevent slipping, achieving accurate printing registration with minimal additional components.
Solution Approach 2:
A simple guide roller is introduced as an intermediary component to achieve the prescribed winding angle. This single component solution is simpler than alternative mechanisms that could be used to enforce the same effect, minimizing the increase in device complexity while effectively preventing slipping.
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 effectively prevents slipping between the impression cylinder and the base material, maintaining accurate printing registration and preventing damage, even with high-surface-smoothness materials like films, by enhancing frictional force and using a registration adjusting mechanism.
Implementation Method 1
a guide roller is provided on the sheet discharging side and a guide roller is provided on the sheet introducing side to wind the base material to be printed passing through between the peripheral surface of the impression cylinder and the blanket cylinder on the peripheral surface of the impression cylinder at a prescribed winding angle
Data Source
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AI summary
To provide an intermittent printing apparatus capable of preventing a slip and a deviation in printing registration from being caused when a base material to be printed is travelled. A step-back roller 6 on a sheet introducing side and a step-back roller 10 on a sheet discharging side are synchronously and rotationally driven forwardly to make a base material to be printed W travel forwardly, so that image printing is effected on the base material to be printed by an impression cylinder 9 and a blanket cylinder 8, and the step-back roller 6 on the sheet introducing side and the step-back roller 10 on the sheet discharging side are synchronously and rotationally driven backwardly to make the base material to be printed W travel backwardly. The base material to be printed W is wound around a peripheral surface of the impression cylinder 9 at a prescribed winding angle, the base material to be printed W is pressed against the peripheral surface of the impression cylinder 9 by a nip roller 42 for impression cylinder, and the impression cylinder 9 is rotationally driven forwardly and backwardly in synchronization with the step-back roller 6 on the sheet introducing side and the step-back roller 10 on the sheet discharging side.