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Патент USA US3068928

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Dec. 18, 1962
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Lloyd B. Smbéh.
,United States Patent 0 "ice
Patented Dec. 18, 1962
Lloyd B. Smith, % Owen-Richards Company,
_824 N. 31st St., Birmingham, Ala.
Filed Nov. 16, 1960, Ser. No. 69,650
7 Claims. (Cl. 144—246)
feed logs to and remove them from a ring type debarker.
The debarker is indicated in wholly diagrammatic man
ner by the block D, it being understood that the debarker
embodies a rotating part which rotates about the axis of
the log, for instance as indicated by the arrow 10. Fur
ther, such debarkers generally have means to raise and
lower the ring to center the ring relative to logs of dif
ferent diameters. I have illustrated such means as being
This'invention relates to apparatus for conveying logs
a hydraulic cylinder 11 mounted on a fixed support indi
axially and‘more particularly to such apparatus espe
cially adapted for feeding logs axially into or removing 10 cated at 12. The hydraulic cylinder has its piston rod
them from debarkers or like‘apparatus.
In the art of feeding logs to apparatus such as de
barkers, it usually is desirable to feed large and small di
ameter'logsthrough the debarker at different linear rates
of speed. Usually, debarkers are made to take a certain
t 13 attached to a part of the debarker ring frame.
admitting ?uid to the lower end of the cylinder from a
valve 14, the ring may be raised up and down so as to.
center it relative to an oncoming log indicated bythe
letter L. A pump 16 supplies ?uid under pressure and
the usual reservoir 17 is shown diagrammatically.
range of log sizes, for example. from 4 inches diameter
My improved log feeding and discharge mechanism
to 24 inches diameter. Since the debarking elements
comprises pairs of generally conical shaped rollers, prefer
customarily rotate at constant speed regardless of the
ably frusto-conical, each roller of each pair being indi
size log being worked on, much time is wasted in de
barking logs smaller than the maximum size for which 20 cated by the numeral 18 in the drawing. Each roller is
mounted on a vertical shaft indicated at 19, the shaft
the apparatus is designed unless some means is provided
being supported in upper and lower bearings 21 and 22.
to feed the smaller logs at a faster rate than the larger
The pairs of bearings may be braced by suitable mem
logs are fed. Therefore, there is currently a need for a
bers 23 and 24. The lower sets of bearings may be sup
simple, rugged apparatus to accomplish the foregoing and
especially such apparatus which automatically feeds all 25 ported on columns 26 resting on the ground or other sup
logs at the optimum rate.
The prime object of my invention, therefore, is to pro
vide‘simple, rugged and economical means which auto
matically feeds all size logs within a range of diameters
port indicated at 27.
It will be noted that the rollers 18 are spaced apart a
distance less than the diameter of the smallest log to be.
conveyed. Further, the shafts '19 supporting each of the
axially into a debarker or the like at the optimum de 30 rollers 18 carry intermeshing gears 29. That is to say,
eachshaft 19 of each cooperating pair of rollers ‘18 is pro
barking speeds for each size, log.
vided with one of the gears 29 which engages the gear 29
Another object is to provide apparatus of the charac
on the cooperating shaft.
ter designated which shall feed logs of all sizes within a
given range without requiring positive, all around grip 35 One longitudinal row of each of the shafts 19 may be
provided with bevel gears 31. Mounted in suitable bear
ping or engagement with the logs, thus facilitating the
ings is an elongated shaft 32 which carries bevel gears 33
feeding of crooked logs or those having projections there
cooperating with gears 31. The shaft 32 may be driven
by a motor or the like indicated at 34, whereby the rollers
Briefly, my invention comprises one or more, prefer
ably two sets of generally conical shaped rollers, mounted 40 may be driven in unison and at substantially constant
alongside each other on vertical shafts. The shafts are
The surfaces of the rollers 18 may be serrated as'at 13*‘,
driven in unison with adjacent surfaces of the rollers mov
thus to afford good gripping engagement with the logs
ing in a direction ‘to feed the logs to the debarker, or, if
L. Further, in order to assure good ?rm driving contact
used as discharge means, in a direction to feed the logs
away from the debarker. Such roller pairs thus form a 45 I may provide gravity or spring actuated hold-down rollers
“trough” for the support of the logs. As will appear,
when smaller logs are being fed they are engaged by the
larger diameter surfaces of the rollers and consequently
indicated at 35 and which may be mounted on arms 36
pivoted at 37 to a stationary support 38. These rollers
may be spaced generally between the spaced sets of pairs
of the rollers 18.
From the foregoing it will be seen, particularly as
are engaged by smaller diameter surfaces of the rollers. 50
shown in FIG. 3, that when a small log L is placed on
Thus, by selecting the cone angles or slope of the rollers,
the rollers 18 it engages the larger diameter surfaces of
I can automatically regulate the axial rate of movement
such rollers. When a larger log L1 is placed on the
of logs in accordance with their diameters. I preferably
rollers it engages smaller diameter surfaces of the rollers.
roughen or serrate the surfaces of the rollers and pro
vide a gravity or spring biased hold-down roll for the 55 Thus, with the rollers 18 being driven at substantially
constant speed, the smaller logs L are fed axially into the
logs to assure positive movement into or out of the de
debarker at a greater linear rate than are the larger logs
L1. By properly selecting the cone angle for the rollers
Apparatus illustrating features of my invention is shown
18 in accordance with the range of log diameters to be
in the accompanying drawing forming a part hereof, in
60 conveyed, I provide means which automatically conveys
the entire range of log sizes through the debarker D at
FIG. 1 is a somewhat diagrammatic side elevational
the optimum axial rate of speed.
view of my improved apparatus on both the infeed and
It will be especially noted that the two conical-shaped
outfeed sides of a ring type debarker, the debarker being
are fed at a faster axial rate than are larger logs which
shown in wholly diagrammatic manner;
rollers, with their minor diameters upright, act precisely
FIG. 2 is a view taken generally along line 2—2 of 65 opposite in conveying effect to the double cone, horizon;
tally disposed rollers which are so common in log feed
FIG. 1 with the log shown in FIG. 1 and certain of the
ing means. In other Words, with the double cone prior
parts being omitted, and with the outline of the debarker
rollers, the larger log engages the larger diameter por
indicated in dotted lines; and,
tions of such rollers; in my improved apparatus the
FIG. 3 is an enlarged elevational view of a pair of the
rollers taken generally along line 3—3 of FIG. 2.
70 smaller log engages the larger diameter portions of the
Referring now to the drawing for a better understand
From the foregoing it will be apparent that I have in
ing of my invention I show the same in position to both
vented an improved, simple and economical feed means
for debarkers. It will be understood that by actuating the
hydraulic cylinder 11 the debarking ring is moved up or
down so that its center coincides with the longitudinal
axis of the logs, thus to accommodate the debarker to
logs of different diameters. Also, in some cases it is pos
sible to use single sets of the rollers 18 on both the feed
and discharge sides of the debarker. In this case the hold
roller at the bottom and the rollers of each pair spaced
close enough each to its associated roller to support a log
therebetween, and means to rotate the rollers substan
tially in unison with adjacent surfaces thereof moving in
the desired direction of log travel.
4. Apparatus as de?ned in claim 3 including log hold
down means engaging the upper surface of a log being
supported on the rollers.
down rollers would be placed directly over the pair of feed
5. Apparatus as de?ned in claim 4 in which the log
rollers 13. My improved apparatus is extremely simple 10 holddown means is in the form of a roller adapted to en
of manufacture, trouble free in operation and rugged
gage said upper surface of the log.
enough to stand the rough treatment to which this type
6. The combination with a rotary head type debarker,
of machinery is subjected in normal use.
of a pair of upright generally conical shaped rollers with
While I have shown my invention in but one form, it
their large ends at the bottom, said rollers being spaced
will be obvious to those skilled in the art that it is not 15 apart a distance to engage therebetween the smallest di
so limited but is susceptible of various changes and modi
ameter log of a range of log sizes, and means to rotate the
?cations without deparitng from the spirit thereof, and I
rollers substantially in unison and at substantially con
desire, therefore, that only such limitations shall be placed
stant speed with the surfaces of the rollers engaging the
thereupon as are speci?cally set forth in the appended
log moving in a direction to move the log axially rela
20 tive to the debarker, whereby smaller diameter logs are
What I claim is:
moved relative to the debarker at greater axial speed than
1. In apparatus for conveying logs and the like axially,
the larger diameter logs of said range of sizes.
a pair of generally conical-shaped rollers mounted for
7. Apparatus as de?ned in claim 6 in which there are
rotation about substantially vertical axes and with the
major diameter surfaces thereof at the bottom and spaced 25 a plurality of spaced pairs of said rollers located close
enough together to support a log and move it relative to
close enough together for the rollers to support there
between the smallest diameter log of a range of log sizes,
and means to drive the rollers substantially in unison in
References Cited in the ?le of this patent
a direction to move a log axially.
2. Apparatus as de?ned in claim 1 in which the sur 30
faces of said rollers are roughened to increase frictional
engagement with the log being conveyed.
3. In apparatus for conveying logs and the like axially,
a plurality of horizontally spaced pairs of generally coni
cal shaped rollers, means mounting the pairs of rollers in 35
substantially upright position with the large end of each
Ahrens ______________ __ Mar. 31,
Nye _________________ __ Mar. 3,
Merry _______________ ._.. Jan. 13,
Ketonen _____________ __ June 25,
Nicholson ____________ __ Jan. 28,
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