A microswitch, also known as a microclick switch, is a tiny spring-loaded switch, usually designated and often associated with a microstep switch or microswitch itself, which is activated by the application of a small, normally harmless but momentary pulling force. Microswitches are used in many types of electronic equipment, such as pagers, credit card machines, telephones, cellular phones, personal digital assistants (PDAs), computer keypads, wireless phones, television sets, and much more. Because they can be activated by very slight pulling forces, microswitches are considered very safe, particularly compared to keypads and similar common electrical devices. Keypads, for example, can activate when someone pulls a string on a keypad – which can easily be done without realizing it – and can thus cause harm to an unsuspecting child, who may not be aware that he or she is being manipulated. On the other hand, microswitches cannot be pulled like keys, and so they provide a more secure interface for users.
To understand how میکروسوئیچ actuators work, it helps to know what a microswitch consists of in order to better understand how these mechanisms work. The main component of any microswitch is a contact layer, which can be made of either a conductive or non-conductive material. This contact layer is very thin; typically only about half a millimeter thick. This is known as the contact surface. There may also be a number of contacts along the edge of this surface, acting as insulators to various other components. In the most basic forms of microswings, there may only be one contact surface and a single actuation; however, in more complex applications, several different situations can take place at once, each resulting in a different result.
In order to understand how these situations take place, it helps to look at how other types of mechanical actuators work. For example, when you use a mini-Snap-action Switch, there are two distinct positions that the switch can be placed in. By moving the switch in either direction, or from side to side, the actuator allows electricity to travel from an external source to an internal terminal, either on the front or behind the mini-Snap-Action Switch.
Because of the unique design of micro switches, there are actually two types of action that can be achieved by these devices. Either the user can press a downward force on the actuator and cause the spring to be compressed, creating a tightening effect that holds the door closed, or the user can push the actuator upward, causing a loosening of the spring, allowing the door to open freely. The key difference between these two methods lies in the amount of pressure exerted on the spring, which is determined by the amount of physical energy generated by the springs. With a flat spring, it is much easier to calculate the amount of downward force necessary to close the door; however, with a curved spring, this is much more difficult to determine.
The mechanism behind the operation of a micro switch is actually quite simple. For one thing, an electrical contact is placed on the top half of the flat spring, where the contact is depressed, and a thin metal wire is located between the two electrical contacts. On the other end of the wire, a thin metallic plate is attached to the bottom half of the flat spring, and the contact is depressed. When the user moves his or her finger over the top half of the contact, this creates a compression of the metal plate, and an upwards pressure on the wire leads to the tightening of the spring.
In order to determine how the downward pressure on the wire causes the actuator to tighten, you would need to have a device that could tell the difference between the different pressure levels created by a flat spring and a curved spring. However, such a device was never developed. Instead, the Microswitch was invented. The mechanism is relatively simple – when you depress a flat spring’s contact and the actuator is depressed, a downward force on the flat spring pushes the contact downward, and a downward force on the actuator leads to its tightening. Thus, with a little bit of ingenuity, you could use a Microswitch to control your flat spring.