Can easily cut through the plaster of the electric saw, in the steel surface can also leave obvious traces, but it is such a sharp saw, in contact with the skin but does not cause any damage, and even a balloon can not be cut, this is what principle? Why can easily cut through the plaster of the sentence instead of cutting not hurt the skin?
First, in general, the circular saw movement is the use of rotation to obtain cutting energy, but with the circular rotation is different, cut the plaster of the sentence is mainly a reciprocating movement, through the symbols of the mark, you can clearly see the movement of the circular saw blade, its position instead of not much change, more in situ round-trip reply, and this is the real reason why he does not hurt the skin. Due to the small round trip intervals and high frequency of the plaster saw, in the face of more elastic skin, the place in contact with the teeth of the saw will also be with the saw as one to carry out reciprocating movement, no cutting behavior naturally will not hurt. Like this sentence by reciprocating for cutting, they also have a generalized name net compound saw, in addition to the round, there is a long bar, the key to their movement all lies in its internal eccentric motor.
Secondly, after turning on the power, the motor inside the gypsum tool starts, driving the interception cam to rotate through the deceleration gear, forming the mesh compound movement of the sliding bar under the action of the cam and the pendulum, driving the blade to cut back and forth. This kind of net compound saw will be safer to operate than the chain saw with circular motion when the movement interval is small. But in many cases, people still have to use chain saws. So what can be done to ensure safety with the more dangerous chain saws? To cut wood table tool as an example, a U.S. company has invented a claim that does not hurt the hands of the safety table tool such. And so the table tool once contact with the human body, it will be in a few milliseconds to immediately kill the stop, and retracted under the workbench, with a simulated finger sausage for the experiment. When the sausage was brought close to the blade at a very high speed, there was only a few millimeters of abrasion on the surface of the sausage.
Third, in order to test its reliability, someone actually put his finger close to it, and the machine stopped instantly, leaving his finger unharmed. How did he do it? Originally, there is a small sensor element set up under the safety tableware, which will monitor the chainsaw in real time. When the human body comes into contact with the table, the table on the current will be absorbed by the human body part. After this subtle change is monitored by the sensing element, the brake mechanism will be triggered at a very high speed, realizing the emergency brake. Although this passion is costly, with new blades as well as brake disks each time, compared to broken fingers. Bleeding, this safety lift does make a lot of sense to invent.