. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. 40 MANUFACTURE OF MECHANICAL PULP §3 allowing dog P to engage ratchet wheel R, and to move itforward far enough for dog L to engage the next tooth and ad-vance ratchet wheel R, one notch, which admits low-pressurewater to front of cylinder and returns the pressure foot; when thepressure foot has reached a determined point on the return stroke,the water is automatically shut off by a stroke regulating L now engages the next tooth of R, thereby turning the plugvalve so that all parts are closed, a
. The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice. 40 MANUFACTURE OF MECHANICAL PULP §3 allowing dog P to engage ratchet wheel R, and to move itforward far enough for dog L to engage the next tooth and ad-vance ratchet wheel R, one notch, which admits low-pressurewater to front of cylinder and returns the pressure foot; when thepressure foot has reached a determined point on the return stroke,the water is automatically shut off by a stroke regulating L now engages the next tooth of R, thereby turning the plugvalve so that all parts are closed, and gives time for wood torefill the pocket, when L engages the next tooth, low-pressurewater is admitted to back of cylinder, and the wood is advancedto the stone. The next movement of the plug valve bjr the ratchet. Fig. 25. admits the high-pressure water for grinding, and it also bringsthe dog L onto the next long tooth, where it swings idly untilthe pressure foot has advanced to the determined point, when thecycle is repeated. It will be noted that one half-turn of theratchet wheel R is sufficient to complete a cycle of operation. The connecting rod T is used to connect up the timing devicefor the cylinder on the opposite side of the stone, as all timingdevices are driven from one stand. The corresponding parts ofthe device for the other cylinder bear the same letters, with thesubscript, as, Lh 7\, etc. When two stones are driven by thesame motor, as shown diagrammatically in Fig. 25, the mastertiming device B (same as B, Fig. 24) is connected to a deviceB2, by means of shaft Y (Figs. 24 and 25). The timing of pocket charging is set so that the pockets maycharge at approximately equal time intervals in the order B, B2,Bi, B3 (Fig. 25), and so that only one pocket may be charging at §3 GRINDERS
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpaperma, bookyear1921
