Sheet Guide Device Crumpling Prevention for Die-Cut Labels
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Solution Overview
Problem
Sheet guide devices fail to effectively prevent wrinkling and crumpling of sheet members, particularly roll paper, as the side edges are exposed to opposing forces, leading to buckling and crumpling when skewed.
Innovation Solution
A sheet guide device with a crumpling prevention unit comprising a protruding part, pressure part, and stop, which guides the side edge of the sheet member to prevent lifting and separation from the conveyance path, using inclined surfaces and pressure mechanisms to keep the sheet aligned and flat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide member with a guide surface is used to guide the side edge of a sheet member, then the side edge guidance is improved, but the side portion of the sheet member is exposed to opposing forces causing crumpling and folding
Solution Approach 1:
The guide member is divided into multiple functional sections: a guide surface for guidance, a protruding part that contacts the side portion to prevent lifting, and a pressure part that applies downward pressure. This segmentation allows each part to perform its specific function without causing harmful effects to other areas of the sheet member.
Solution Approach 2:
The protruding part acts as an intermediary element between the guide surface and the side portion of the sheet member. It transfers the guiding function while simultaneously preventing the side portion from lifting and crumpling, mediating the interaction to eliminate harmful opposing forces.
2Measurement precision
If the side edge of a skewed or meandering sheet member contacts the guide surface, then guidance is achieved, but the side part of the sheet member buckles when it lifts away from the feed path surface
Solution Approach 1:
The protruding part and pressure part are positioned to preemptively counteract the lifting tendency of the side portion before buckling can occur. By applying continuous contact and downward pressure, the system prevents the instability from developing in the first place.
Solution Approach 2:
The guide member is designed with the protruding part and pressure part in advance, so that when the sheet member contacts the guide surface, the anti-crumpling mechanism is already in place and active, preventing rather than correcting the harmful effect.
3Force
If the side edge of roll paper continues to push against the guide member when skewed, then guidance force is applied, but the side edge of the sheet member crumples easily
Solution Approach 1:
The guide member has different local properties: the guide surface provides guidance, the protruding part provides lateral support, and the pressure part provides downward force. This local differentiation allows the system to apply guidance force without concentrating stress in one location, preventing crumpling.
Solution Approach 2:
The guide member design allows for dynamic interaction with the sheet member. The protruding part and pressure part can adapt to the degree of skew and the force applied, providing just enough resistance to maintain guidance while preventing crumpling through continuous contact.
Data Source
AI summary
A sheet guide device has a crumpling prevention unit disposed to a movable part with a guide surface that guides a side edge of die-cut label paper conveyed over the top of a feed plate, and prevents crumpling the side portion of the die-cut label paper of which the side edge contacts the guide surface. The crumpling prevention unit includes a pressure-bearing base unit disposed protruding from the top of the feed plate and causing the side portion of the passing die-cut label paper to rise to the side; a sheet presser part that presses the die-cut label paper to the conveyance path surface at the same or adjacent position to the pressure-bearing base unit; and a side presser member that the side edge of the die-cut label paper inclined by the pressure-bearing base unit contacts.