US 9,810,524 B2
Power tool with optical measurement device
Brian Todd Reese, St. Charles, IL (US); and Cody Lyle Mayer, Chicago, IL (US)
Assigned to SEARS BRANDS, L.L.C., Hoffman Estates, IL (US)
Filed by Sears Brands, L.L.C., Hoffman Estates, IL (US)
Filed on Dec. 15, 2015, as Appl. No. 14/970,047.
Prior Publication US 2017/0167855 A1, Jun. 15, 2017
Int. Cl. G01B 11/14 (2006.01); B23D 59/00 (2006.01); B23Q 17/24 (2006.01); G01B 11/02 (2006.01)
CPC G01B 11/14 (2013.01) [B23D 59/001 (2013.01); B23D 59/008 (2013.01); B23Q 17/2471 (2013.01); G01B 11/026 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a tool to be applied to a workpiece;
an optical measurement device in a feed path of the tool, the optical measurement device configured to generate a plurality of displacement measurements indicative of displacement of the workpiece as the workpiece traverses the feed path toward the tool; and
a controller configured to generate a distance measurement of the workpiece based on the plurality of displacement measurements;
wherein the distance measurement indicates a distance between an end of the workpiece and a location of the workpiece to which the tool is to be applied; and
wherein the optical measurement device comprises an optical displacement sensor configured to generate a displacement measurement of the plurality of displacement measurements based upon a detected offset between a reference window of pixels in a first image from the plurality of images of the workpiece and a matching window of pixels in a second image from the plurality of images.