![]() Each of the cams engages one of the four contacts in the switch.Įach of the four contacts has a bend in it, and each bend is located at a different height inside the box. The motor turns the gear on the dial, which is connected to a set of four cams stacked on top of each other. The tiny gear on the motor turns very slowly and it engages a bigger gear inside the switch that makes the switch turn even slower. The picture below shows the motor unscrewed from the switch. Here is a view of the back of the cycle switch. In the next section we'll see what makes the tumbler spin. ![]() The fan is a centrifugal type of device - as it spins, it flings the air to the outside, sucking air from the center and forcing it out the duct at the back of the dryer. The air is drawn through the lint screen and down a duct in the front of the dryer, where it enters the fan. The air passes through the holes in the door, and out through the big slot in the bottom of the door which leads to the lint screen. The hot air now makes its way through the clothes in the tumbler, and then into the holes in the door. The metal stamping on the right, with the big holes in it, makes sure that air can enter the tumbler only after it has gone through the heating element. The air is drawn through the heating element and into the holes in the back of the tumbler. This heating element consumes lots of power - 4,000 to 6,000 watts on most dryers. This is a standard nichrome-wire heating element, just like the heating element in a toaster (see How Toasters Work for details on nichrome wire). After the air enters the body of dryer, it is sucked through the heating element, and then into the clothing tumbler. The first thing that the air hits is the heating element. The fan forces it into the duct leading out the back of the dryer, at which point it exits your house.It passes through a duct in the front of the dryer and into the fan.It enters the door and is directed down through the lint screen.It is sucked past the heating element and into the tumbler.It enters the body of the dryer through a large hole in the front of the dryer. ![]()
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