Lumber, its manufacture and distribution . ageand log away from the cutting linewhen the carriage is gigged backafter a cut has been made. This isnecessitated by the liability of the back of the saw catching on a splinter or on the log itself, which mightresult in pulling the saw from the wheel. An off-setting device is not used with a double-cutting band head-saw or with a circular head-saw, because the cutting edge of the sawwill sever the wood and free itself. An offset of the drag typeshown in Fig. 41 has a wooden-shod drag shoe A traveling on top ofthe V-rail; a lever arm B, one end of wh
Lumber, its manufacture and distribution . ageand log away from the cutting linewhen the carriage is gigged backafter a cut has been made. This isnecessitated by the liability of the back of the saw catching on a splinter or on the log itself, which mightresult in pulling the saw from the wheel. An off-setting device is not used with a double-cutting band head-saw or with a circular head-saw, because the cutting edge of the sawwill sever the wood and free itself. An offset of the drag typeshown in Fig. 41 has a wooden-shod drag shoe A traveling on top ofthe V-rail; a lever arm B, one end of which is attached to the shoeand the other to the opposite side of the carriage; a shaft C attachedto B at D and to the lever arms E and F; and the collars G and H,to which one end of E and of F are attached. The outer end of thelevers E and F are attached to a casting bolted in the corner of thecarriage frame. The axle attachments G and H each haVe a loose collar into thetop of which the lower end of a pin on the lever arm E or F fits, the. Fig. 40.—A Head Block for a PacificCoast Sawmill Carriage. A. HookDog. B. Spud Dog. C. ExtensionHook. D. Roller on Top of theCarriage Knee. 62 SAWMILL EQUIPMENT upper end of the pin being fastened to a casting 7, which is bolted tothe carriage frame. A collar, rigidly attached to the axle, is placedon either side of the loose collar. When the carriage gigs back the slideA drags on the rail, which forces the shaft C toward the forward endof the carriage, which in turn causes the lever arms E and F to assumethe position shown in Fig. 41. This forces the pin on the lever armsagainst one side of the loose collar and shunts the carriage on its axlesaway from the saw line. Reversing the direction of the carriage causesthe lever arms E and F to straighten out and shunts the carriage over
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
