FURLSI FRODL' I S LABORATONr' I -,.T -H ' !.
U. S. ''L[,'ARIMLNT OF AGRICULTURE
*.4S2224 (Layouts) SMALL SAWMILL IMPROVEMENT
PRACTICAL POINTERS TO FIELD AGENCILS
SMALL MILL CONVEYOR
A conveyor that carries the sawdust, edgings,--i- An bo;.r's away from;
the mill is a labor saver for mills cutting enough at a set to warrant thl'
installation costs. Fh,. conveyor shown in figure 1 is of ithe sipl2 trough
type, in which the load is carried by a moving chain with cross bars or lugs
spaced at intervals. It. extends from the saw pit straight bac o .b bornr
ana is readily accessible to headsaw and edger sawdust, to the sae;oi stock
as it falls away from the headsaw, and to the edgings and edged boirdx' from
the tail end of the edger. Lumber is pulled off this conveyor at a poi-t
beyond the mill having sufficient elevation to permit pac.., pilin o tt
the "haul-out vehicle can back under the load. If slabs cmn be utilized,
these also may be taken out, cut up, and collected in an elevated bin per-
mitting cheap handling. The cutoff saw would be located along the conveyor
and powered by a small power unit separ".te from that used to run the mill. ? '
This feature is not shown in the figure. Provision may alco be mado to
deflect the boards and edgings from the rear of the edger, thus removing the
necessity of the tail edgerman. A live roll in the rear edgeur table plus a
platform inclined to carry material by -ravity into the trough is required.
This possibility is suggested but not shovi in the figure. The incline of'
the conveyor is such that starting below the saw it is slightly below the
bed of the rear edger table about 16 feet back of the edger saws, and at
the discharge end it is approximately 16 feet above the burner pit. Timbers
or ties are taken over dead rolls to the timber dock.
Th. conveyor chain should be geared to travel about 60 foet per
minute. A q/g-inch chain with an opening about 1-1/2 by 5 inches is suit-
able. Wioodon cleats are attached at approximately 4-foot intervals, but the
exact spacing depends upon the diameter and tooth spacing of the drive
sprocket; cleats are spaced to ride between adjoining teeth and not to engage
them. The cleats are made of hardwood strips, abou i I n'J.'
run through the link and strar.,.d wi th metal. o 1 3 iT 1
idle pulley designed to take up slack. A less des*ra r La:b
this, and drives throu.,gh the pulley at the end of trough unll_-;" 1.. sI"
Details at the burner end are net showm, but provi ion r,.i b.. !ade to for-
stall burning the conveyor. This is accomiYlished y us-ir", 3a,.'h
inclined from the chain end dow-n into the fire pi. To eliminate, as much
as possible, smoke blowing to ih3 mill the burne I be a` least 75
feet from the back of the-mill and preferably n.., Prfo..ilin
rind direction. 14V0T''orida
C. J. TLFy :D
t Maintained at Madison, Wisconsin in cooperation with the University of Wisconsin S pt b r 1 ,'
*See outline in Small Sawmill Improvement Working P'lan. March 1930, for explanation of indexing system pro, .1
Mimeo No. RJ)9-21
I| IIIIII II III 1 IIIIIII II I IIII 1 IIA
UNIVERSITY CIP FI. OPID
I 3 1262 08927 0069II II I l II !1,1111111
3 1262 08927 0069
WINGED I IJx I CHAIN CLEAT5
TO TAKE UP
DETAIL OF DRIVE A55EMBLY
1 ur 1,. -I.-Small mill co1wvIvor