Lumber, its manufacture and distribution . geared reced-ing device, with which By permission American Sawmill Machinery Co. a brake wheel is UnneC- Fig. 46.—A Carriage Set-works and Receder for use essary. A type of com-with Portable Sawmills. A. Ratchet Wheel on the bined setting and reced-Set Shaft. B. Set and Receding Lever. C. Reced- • _. mechanism is shown ing Gear. D. Pawl. E. Pawl Lift. ,-,. An mi • i in Fig. 46. This has a ratchet wheel A mounted on the set-shaft, a set and receding lever B, a receding gear C, and a rear pawl D. When in the position shown in the cut, the pawls on the r
Lumber, its manufacture and distribution . geared reced-ing device, with which By permission American Sawmill Machinery Co. a brake wheel is UnneC- Fig. 46.—A Carriage Set-works and Receder for use essary. A type of com-with Portable Sawmills. A. Ratchet Wheel on the bined setting and reced-Set Shaft. B. Set and Receding Lever. C. Reced- • _. mechanism is shown ing Gear. D. Pawl. E. Pawl Lift. ,-,. An mi • i in Fig. 46. This has a ratchet wheel A mounted on the set-shaft, a set and receding lever B, a receding gear C, and a rear pawl D. When in the position shown in the cut, the pawls on the ratchet wheel are in gear and a forward and back motion of the lever B will set the knees forward. By pulling up on the rod E, the pawls on the ratchet wheel are raised and the rear pawl D thrown into contact with the receding gear C. A forward and rear motion of lever B will then cause the knees to recede at a speed about three times faster than they are set forward. Steam-driven set-works have largely supplanted hand set-works in. THE LOG CARRIAGE AND ITS ACCESSORIES 67 large mills because of their greater efficiency. In principle, they donot differ from hand set-works except as to the character of powerused. One of the standard types is shown in Fig. 47. The ratchetwheel and pawls are enclosed in the case A, the former being attachedto the set-shaft B. Power is furnished by the steam cylinder E, tothe piston of which is attached the rack D, which meshes into the pinionC, which, in turn, through the double-acting pawl levers F, cause theset-shaft to rotate.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
