Perforation Contrast Member with Active Inactive Sections
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Solution Overview
Problem
Current transversal perforating devices struggle with high initialization times and costs, particularly when used downstream of high-speed printers, and are inefficient in handling close and spaced perforations due to expensive mechanisms and velocity mismatches between printing and perforation speeds.
Innovation Solution
The equipment employs an active and inactive section contrast member with a servomechanism that rotates between perforation and non-perforation conditions, allowing for high-speed transversal perforations with reduced costs and increased flexibility by using a blade support with interchangeable blades and a reciprocal shifting mechanism for precise positioning and 'jumping' perforations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a contrast roller is used with entirely active surface for contrast to blades, then large possibility of positioning of perforations is achieved, but start time to synchronize rotating velocity with form feeding velocity increases system initialization time
Solution Approach 1:
The contrast member is divided into active sections and inactive remaining sections. The active sections are positioned to engage with blades only when needed for perforation, while inactive sections are positioned away from the blade path. This segmentation allows the contrast member to be rotated into position only when a perforation is required, reducing initialization time while maintaining positioning versatility.
Solution Approach 2:
The contrast member is designed to be dynamically positioned rather than continuously rotating at synchronized velocity. The contrast servomechanism rotates the contrast member only when needed, transitioning between active and inactive positions dynamically, thereby reducing the time required to synchronize with form feeding velocity.
2Productivity
If a reciprocal shifting mechanism is used between blade support and contrast roller, then high velocity operation with close and spaced perforations is achieved, but device cost increases
Solution Approach 1:
The complex reciprocal shifting mechanism is removed from the system. Instead, the contrast member is designed with active and inactive sections that can be rotated into position by a simpler contrast servomechanism, eliminating the need for expensive reciprocal shifting mechanisms while maintaining high velocity operation capability.
Solution Approach 2:
The mechanical reciprocal shifting mechanism is replaced with a servomechanism-controlled rotation system. The contrast servomechanism uses motor control to position the contrast member, substituting complex mechanical linkages with a more efficient electro-mechanical system that reduces cost and complexity.
3Reliability
If the contrast member has entirely active surface, then continuous perforation capability is maintained, but stress on components increases during high-speed operation
Solution Approach 1:
The contrast member is segmented into active and inactive sections. During high-speed operation, only the active sections engage with the blades, distributing the stress across fewer contact points. The inactive sections remain disengaged, reducing overall component stress while maintaining the ability to perform continuous perforations as needed.
Solution Approach 2:
The contrast member is rotated periodically to bring active sections into position only when perforation is needed. This periodic engagement reduces continuous contact and stress on components during high-speed operation, while maintaining reliability by ensuring active sections are available when required.
Data Source
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Figure 4
Figure 5a~5e
AI summary
Equipment (206) for transversal perforation, on the fly, of continuous forms in movement (211), comprising a perforating device (207) having a blade support (208) with a perforating blade (209,223a,223b), which is actuated for the rotation by a blade servomechanism (214) in synchronism with the form for the perforation. A contrast member (217) including active sections (219) and remaining inactive sections (221) is rotated by a contrast servomechanism (218) parallel to the blade support (208). In a condition of perforation, each active section, in synchronism with the form (211), can provide function of contrast for the blade (209,223a,223b). In a condition of non-perforation, each inactive section (221) is spaced away from a surface of movement (212) of the form, whereby avoiding the perforation on the passage of the blade.