Limit switches, as the name suggests, are precision switches that are designed to work as limiting devices. The switch is typically snap-action and designed to sense the presence, absence, or be triggered by an excess or lack of physical contact at the position where it is installed.

The flexibility and adaptability of limit switches to different tasks and environments has made them very popular as components of conveyor belt systems.

Industrial conveyor belts are considered to be amongst the greatest inventions for boosting production, as well as reducing time, costs and manpower requirements. They are commonly used in production, mining, assembly lines and just about every major industry or sector today.

They typically consist of a number of pulleys that rotate under a continuous belt. Some of these pulleys are powered and they drive the belt, keeping any material on top continuously moving towards its destination.

Conveyor belts can be broadly classified into two classes, which are:

These conveyors are used for transporting smaller volumes of material like packaged goods, or lighter materials like boxes.

These are heavy duty conveyor systems which are designed to carry heavier loads or bulky materials, like industrial and agricultural goods.

While conveyor belts can tremendously increase efficiency, they are prone to jamming from over-loading unless the correct safety measures are put in place. Limit switches help prevent this by measuring the height or number of individual products passing through the conveyor system. In case the switch senses an object that may cause an obstruction, it shuts the system down to prevent damage or spillage.

Depending on the environment and purpose, there are a variety of limit switches which can be used in conveyor systems:

When I was a kid growing up in Los Angeles, I never saw a ceiling fan in my friends’ homes. We called them “swamp coolers,” and they appeared as props in movies that were set in the deep South or in Casablanca.

While I never saw a real one as a kid, ceiling fans date back to the late 1800’s, when they were originally powered by water. In 1882, Philip Diehl, the German-American inventor of the motor for Singer sewing machines, adapted his sewing machine motor for the ceiling fan. Electric ceiling fans grew in popularity and were quite commonplace in both America and abroad by the 1920’s. Movies from the 20’s often feature them in restaurants and hotel lobbies.

Between the 1930’s and 1950’s in the U.S., however, the fans went out of vogue. Thus, my lack of experience with them as a child (which dates me as a Baby Boomer!) However, with the oil shortages of the 1970s, we started to wake up to the cost of electricity, and the fans experienced a revival. Since the 1970’s their popularity has gone up and down, but has been in uptrend since about 2000, when energy conservation again became a priority. If you would like to save energy and money, check out how ceiling fans can save energy and money in both summer and winter.

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It’s hard to imagine life without electricity. Those rare times when the power goes out entirely serve as reminders of how much we depend on our electrical systems to get us through the day (and night). You need to take special care of the electricity in your home with prompt repairs whenever they are needed.

Today’s infographic breaks down the essential facts about energy efficiency. It explains why energy efficiency is so important, and goes into detail about how wasting energy can harm the environment. Then, after convincing you that conserving power is a good idea, it offers a comprehensive guide to help you start saving more energy at home, assessing the efficacy of your appliances, insulation, and of course, your lighting.

I especially like this infographic for the Incandescent/CFL/LED comparison chart at the very bottom. Good stuff!