Lumber, its manufacture and distribution . e of which, shown inFig. 49, has a friction disk A attached to the drive shaft, a forward-motion friction wheel B, a gig-back friction C, and the lever D. Bya movement of the lever D, the friction wheel B is thrown againstthe friction disk A, which transmits power to the pinion shaft E through 70 SAWMILL EQUIPMENT the miter gears F, thus driving the carriage forward. The speed atwhich the pinion is driven can be increased or decreased by turningthe wheel G, which in turn moves wheel B along the slotted shaft onwhich it is hung. The speed of B is depen
Lumber, its manufacture and distribution . e of which, shown inFig. 49, has a friction disk A attached to the drive shaft, a forward-motion friction wheel B, a gig-back friction C, and the lever D. Bya movement of the lever D, the friction wheel B is thrown againstthe friction disk A, which transmits power to the pinion shaft E through 70 SAWMILL EQUIPMENT the miter gears F, thus driving the carriage forward. The speed atwhich the pinion is driven can be increased or decreased by turningthe wheel G, which in turn moves wheel B along the slotted shaft onwhich it is hung. The speed of B is dependent on the circumferenceof the circle of contact on B. By reversing lever D the friction wheelC is thrown against the friction disk A and the carriage is gigged type of belt-and-friction feed has a bull wheel or iron-face frictionwheel A, Fig. 50, mounted on the shaft carrying the pinion. On eitherside of the bull wheel are placed paper frictions B and C driven by thedrive pulley D. Pulley E is an idler and F a belt tightener. The. Fig. 49.—A Friction Drive for a Small Sawmill Carriage equipped with a Rack-and-pinion Feed. A. Friction Disk or Bull Wheel attached to the Saw Forward-motion Friction Disk. C. Gig-back Friction Disk. D. ControlLever. E. Shaft with Pinion Wheel (not shown) attached on the Right whichmeshes into the Rack on the Carriage Frame. F. Miter Gears which driveShaft E. G. Speed Control Hand Wheel for shifting the Friction Disk B alongthe Shaft. rig is so belted that friction pulleys B and C run in opposite means of the single lever G the bull wheel can be shifted againsteither B or C, thus driving the carriage forward or gigging it backas desired. In the belt feed shown in Fig. 51, C is the flange-driven pulley,D a belt pulley on the feed shaft, A an idler pulley connected tothe husk by a tightening rod, and B the tightener pulley directly con-nected to the sawyers lever handle. A rear motion of the lever tightensthe bolt and
Size: 1777px × 1406px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
