Abstract
Timer is a delay time switch, is widely used in a variety of washing machine, electric oven, electric fans and other household appliances. Among the timer in the mechanical timer, with its low costs, easy operation, easy to produce and so there are still high in developing countries, the market value. Rely mainly on mechanical clockwork timer spring as a power source, through the regulation of escape wheel, the transmission gear mechanism to achieve the purpose of time, so the various components throughout the product design is very important to the production. In this paper, mechanical timer for 30 minutes, the principle of structural analysis, and then bonding the actual production design.