Core Chuck with Angled Engagement Holes
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Solution Overview
Problem
Existing core chucks for hollow roll cores, particularly in packaging and printing industries, often fail to securely engage damaged or poorly made cores, leading to unsatisfactory performance and high maintenance costs.
Innovation Solution
A core chuck design featuring elongated elements with angled holes and toothed extensions that engage internally with the core, providing secure rotational unity without relying on key notches or slots, and a separate mechanism for securing the chuck to a spindle for rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If keyed web cores are used, then core ends can be engaged by a key, but core ends are damaged or key slots are mutilated which renders the key unsatisfactory for keeping the core firmly secured
Solution Approach 1:
The invention removes the dependency on key notches or slots from the core by using a keyless chuck design. The elongated elements engage the core interior surface directly through angled holes, eliminating the harmful key slots that cause core damage and mutilation while maintaining reliable engagement.
Solution Approach 2:
Instead of using external keys that engage from the outside of the core, the invention uses internal engagement elements that reach into the core interior through angled holes. This inverted approach engages the core from the inside without requiring external key slots, thereby preventing core damage.
2Adaptability or versatility
If expanding chucks, tapered chucks with fluted surfaces, or chucks with internal core restraints are used, then keyless chuck expedients are provided, but these are quite expensive, difficult to maintain and use
Solution Approach 1:
The chuck is divided into a simple cylindrical body with separate elongated engagement elements that can be independently manipulated. Each element resides in an angularly situated hole and can be independently extended to engage the core, providing keyless functionality without the complex fluted surfaces or internal restraint mechanisms of prior art.
Solution Approach 2:
The engagement elements are positioned at angular orientations relative to the chuck axis and tangent lines, creating engagement in multiple spatial dimensions. This angular arrangement provides secure core engagement without requiring complex expanding or tapering mechanisms, simplifying the overall device structure.
3Reliability
If internal core restraining devices are forced into position automatically by mechanical action, then core engagement is achieved, but the mechanism becomes complex and difficult to maintain
Solution Approach 1:
The elongated elements are designed to be manually manipulated into engagement positions without requiring complex automatic mechanical forcing mechanisms. The simple angular holes and movable elements allow operators to directly engage the core interior, eliminating the need for maintenance-prone automatic restraint devices while maintaining reliable engagement.
Data Source
AI summary
There is disclosed chuck configurations for internally engaging the hollow core element of a roll of packaging or printing sheet or other web material in which a generally cylindrical chuck body insertable in a web core has at least one hole through the chuck body at an acute angle with the tangent to the chuck body at the outer entrance point of the hole and at an acute angle with the plane perpendicular to the chuck cylindrical axis. At least one elongated element is configured to engage rotatably in each of the holes and having on a distal end thereof one or more pointed or toothed extensions for engagement with the interior of a hollow web whereby chuck engagement with a hollow core may be made by manipulating such elongated elements to extend outside the periphery of said chuck body. The chuck may also be provided with means for securing it on a spindle or shaft for rotation therewith which is separate and independent of the holes and elongated elements for engaging the hollow core.