Patent ID: 8007265

Claim:
A positioning mechanism for use in a mold structure to position a film within the mold structure for an injection molding, the mold structure including a core mold portion and a cavity mold portion for mating with the core mold portion, the core mold portion including a core plate and a core insert formed on the core plate, the cavity mold portion including a cavity plate and a positioning cavity defined in the cavity plate, the positioning cavity corresponding to the core insert, the positioning mechanism comprising: a cavity insert comprising a positioning portion and a sliding portion; the sliding portion integrally connecting with the positioning portion, the sliding portion configured for a limited sliding within a sliding cavity defined in the cavity plate and communicating with the cavity; the positioning portion positioning the film in the positioning cavity during the injection molding, without any deformations to the film by the positioning; and an elastic member positioned between the cavity plate and the cavity insert for biasing the positioning portion out of the sliding cavity to enter into the positioning cavity.