. Kanadische Forstindustrie 1897-1899. Holzschlag; Wälder und Forstwirtschaft; Wald; Wald - zellstoffindustrie; Holz verarbeitenden Industrien. Die CJLITJLID^ LUMBERLI iLH Juli, wenn Hinweise auf Gürtel fahren. Von "Millman," in Woodworker. Gekrönt Riemenscheiben sind in der Regel dort eingesetzt, wo die Art des Antriebs ist, so dass der Gurt ist geeignet, zu einer Seite zu laufen oder abrutschen können. Die Centri-fugal Kraft hält den Riemen auf der Krone der konvexen Felgen der Riemenscheiben. Diese Tendenz des Riemens, der Teil einer Riemenscheibe, wenn der Durchmesser der Felge ist das größte zu umarmen, hat oft irreführend gewesen. Von ihm kam die"

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. Canadian forest industries 1897-1899. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. THE CJLITJLID^ LUMBERLI iLH July, if HINTS ON BELT DRIVING. By "Millman, " in Woodworker. Crowned pulleys are usually employed where the nature of the drive is such that the belt is liable to run to one side or slip off. The centri- fugal force keeps the belt on the crown of the convex rims of the pulleys. This tendency of a belt to hug that part of a pulley where the diameter of the rim is the greatest, has often been misleading. From it came the "high side" theory ; and there are many good mechanics difficulties that usually arise with combinations of this description are due to the use of common belts. Belt h hugs the cone more on the side under which the diameter is the greatest. If no guides or belt shippers interfere, the tendency will be for the belt to keep moving towards that part of the cone where the diameter is the greatest. When the belt finally gets to the edge it will hang over, as at i. The shape of the cone having stretched the belt more at this side, which is now hanging over, the tensions are about. keeping the belt in the right place, and for shifting it from a fast to a loose pulley, and vica versa, is shown in Fig. 9. A wood or iron frame (e) is provided with two rollers (d d), set as shown, and just far enough apart to receive! the belt. The frame is put in slides and the latter are fastened to supports. The shaft (f) has a little cog wheel keyed to its top end, which wheel engages with a row of cogs screwed to the shaft of the frame. The lower end of rod f is provided with a turning wheel (h), this being near the floor, so that it can be worked. Thus to shift the belt from one pulley to the other requires only the turning of this wheel. In Fig. 10 is a scheme worked successfully by the writer on a belt system in which the main belt could not be made to keep well on the center of the several wh

Stockbilder mithilfe von Tags suchen

• bookcentury1800
• bookdecade1890
• booksubjectforestsandforestry