Indiana Patent of the Month – September 2021

If you have ever used a circular saw, you know it typically includes a guide column with a marking ruler. The guide column helps to properly feed the material into the saw. A slider and a hand wheel are designed to allow the feeding support plate to be repositioned based on the angle of cut needed. Once the support plate is moved, a lever fixes the plate, slider, and guide column in place. NorthTech Machine, LLC has plenty of experience with these saws, and knows just how troublesome this fixing mechanism can be, not to mention how it can block the marking ruler at times. As a leading developer of industrial machinery, they have recently redesigned the circular saw removing the limitations they have experienced first hand.

They developed a new adjustable positioning structure which uses a magnetic slider fitted to the guide column. This magnetic slider can move and fix the support plate more readily. They included a micro pneumatic cylinder on the bottom of the slider which can actuate the magnetic slider causing it to release or fix to the guide column. This is done by utilizing a change in the magnet value on the magnetic slider, thereby either securing it in place magnetically, or releasing it. The change in magnetic value is initiated by a control button. In other words, it is easy to adjust the support plate toward a set position by pressing the control button. The operator holds the control button to release the slider, and can then manually move it into the preset position. To overcome the issue of the marking ruler being blocked, they designed their system to digitally display the displacement value of the support plate based on the displacement value of the magnetic slider. This is equivalent to the marking ruler on traditional saws, but does not require you to manually align your slider with marks on a ruler. Instead, precise calculations help you to position the slider as needed. When in place, the operator releases the control button and the magnetic slider locks in place. This not only makes positioning the table saw easier, it makes it safer and more precise in its securely locked position.

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