| 摘要 |
This invention relates to a mechanism for securely holding a tubular core on which a band of material such as photographic paper is to be wound. The core is held by a gripping mechanism inside a mandrel on which the core is mounted. Running through the mandrel coaxially therewith is a rotatable shaft having three rollers each mounted on a different apex of a triangular plate securely coupled to the shaft. Studs radially located within the mandrel are positioned to be engaged by the rollers so that on rotation of the shaft relative to the mandrel the studs protrude through the periphery of the mandrel to grip the core. A friction clutch between the mandrel and the shaft is provided to hold them in position after the studs have been engaged with the core.
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