Abstract: To overcome a demolding difficulty during the injection molding process for a stem-bracket part for iPads, three types of demolding mechanisms were designed. In these mechanisms, a bevel slider core pulling mechanism was adopted for a side simple structural feature, a small cylinder slide block core pulling mechanism was adopted for a deep hole feature, and a combined core pulling and demolding mechanism was adopted for the complicated central position. In the case of design of the combined mechanism, a die-bending pin-driving slider mechanism was combined with the three synchronous linkage slider core pulling mechanisms driven by a rear mould three-linkage cylinder. This demolding mechanism could conduct the core pulling at the corner and let out the mold motion space, and then the three-linkage mechanism could realize a synchronous linkage to internal contraction type three-slide block core pulling mechanism. The results indicated that the mechanism had a simple and practical structure.