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Патент USA US3055416

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Sept. 25, 1962
H. F. ELFORD
3,055,406
VENEER PRESSURE BAR
Filed Feb. 15, 1960
2 Sheets-Sheet 1
Harold EEJF
INVENTO
BY
W4 /Mm¢
Sept. 25, 1962
H. F. ELFORD
3,055,406
VENEER PRESSURE BAR
Filed Feb. 15, 1960
2 Sheets-Sheet 2
1
TE. ,
Harold F Elford
INVENTOR
“ 1% nited States
1
3,055,406
‘VENEER PRESSURE BAR
Harold F. Elford, Portland, Greg, assignor, by mesne
assignments, to Elford Plywood Machinery, Inc., a cor
poration of Oregon
Filed Feb. 15, 1960, Ser. No. 8,772
7 Claims. (Cl. 144-213)
3,@55,40?
Patented Sept. 25, 1962
2
Another feature of the invention is the provision of
novel means for introducing lubricant to the groove just
discussed. Thus, in a preferred embodiment, the mount
ing for the roll segments takes the form of an elongated
bar which is adapted to be supported on the usual support
for the pressure mechanism of a lathe. This bar has ex
tending out from one side thereof elongated pull studs
that are used in positioning and securing the bar on the
support. Each pull stud has an axial bore extending
therethrough, such bore communicating with an additional
bore formed in the mounting bar that communicates with
one of the lubricating grooves. The construction enables
a maintenance man rapidly to apply lubricant to the mech
therefrom.
anism without disassembling the same.
In veneer lathes, it is customary to include such pres
Another object and feature is the provision of novel
sure mechanism to produce a degree of compression of 15
means for mounting the various roll segments so that each
the outer wood and prevent thick and thin cutting. Con
may readily be removed and replaced. The mounting
ventional pressure mechanisms have comprised either
for the rolls includes plural cap sections which are each
stationary press ‘bars that slide against the log periphery
detachably secured to the roll mounting bar, and have
as the log is revolved thereagainst, or an elongated, con
tinuous roller suitably journaled at its ends that rolls 20 overlapping edges that partially de?ne the elongated
recess that mounts the rolls. These overlapping edges are
against the log surface. The former type of construction
adjustable toward and away from the base of the recess,
is not suited for big lathes and tends to produce large
when adjusting the clearance for the rolls. A single roll
resistances to turning of the lathe spindles, especially
may be replaced by removing only one or two of the cap
when high pressures are used. The latter type of construc
tion has not been completely successful due to difficulties 25 sections.
Other objects and advantages are attained by the in
in mounting (which produced clearance dif?culties), driv
vention which is ‘described hereinbelow in conjunction
ing and lubricating the roller. A continuous rod con
with the accompanying drawings, wherein;
struction has required constant maintenance and fre
This invention relates to veneer lathe construction, and
more particularly to the pressure mechanism used to bear
against the periphery of a log and steady the same as
the knife of the lathe moves into the log and cuts veneer
FIG. 1 is a section view of a veener lathe, showing the
quent replacement of parts.
According to this invention, it is contemplated that 30 knife for the lathe and the location of the pressure mech
anism which steadies and presses against the log during
the pressure mechanism comprise an elongated mounting
and plural roll segments set end to end in the mounting
cutting of veneer therefrom;
‘FIG. 2 is a view taken along the line 2—~2 in FIG. 1
illustrating in more detail the pressure mechanism of
therefrom and in position to engage a log surface. These
roll segments constitute the roller means in the construc 35 the invention;
FIG. 3 is a section view along the line 3—3 in FIG. 2
tion. Each of the roll segments has only a fraction of
illustrating the lubricating system employed for lubricat
the length of the entire mounting. The roll segments are
ing the roll segments present; and
separated from each other by means of separator plates
FIG. 4 is a section view along the line 4-4 in FIG. 2
or spacers which are anchored in the mounting. Be
showing the construction of a separator plate that spaces
cause of the relatively small mass of the segments, and
two roll segments from each other.
‘because each is substantially independent of the other, it
Referring now to the drawings for a description of a
is not necessary or desirable to provide power-actuated
particular embodiment of the invention, and more par
means for rotating the roll segments. The log itself im
with a portion of their peripheries protruding outwardly
ticularly to FIG. 1, a veneer lathe generally indicated at
parts suitable rotary movement to the roll segments. The
roll segments are constrained for rotation in the mount 45 10 is shown having pedestals such as pedestal 12 at either
end of the lathe. Movable in a horizontal direction to
ing without the need of extensive bearing structure at the
and fro between the pedestal and on suitable ways (not
ends of the mechanism, as formerly was needed.
shown) is a knife structure indicated generally at 14 and
The use of plural, aligned roll segments has the par
ticular advantage of permitting portions of the entire roller
pressure mechanism indicated generally at 16. The latter
means to rotate at different speeds. Thus when a knot or 50 includes roller mechanism that normally contacts the
other irregularity protruding from a log comes into con
tact with one of the roll segments, instead of tending to
periphery of a log and exerts compression thereon just
wedge momentarily against a single continuous roll thus
ing structure for the same is conventional, and comprises
before cutting veneer therefrom. The knife and mount
a frame 18 of A-shaped cross section mounting an elon
ables the knot to move over the roller means with those 55 gated cutting knife 20. The latter is adjustable up and
down on the A-frame by means of screws 22. The knife
portions of the roller means to either side of the knot
to affect turning of the entire roll, this construction en
rotating freely.
The segmented roll construction also
takes care of slight tapers in logs, where the outer surfaces
is clamped onto the frame by clamps such as clamp 24
having upper end portions bearing against one face of
the knife. The top edge of the knife is beveled to pro
at the two ends of a log tend to move past the roller
60 vide the knife with a cutting edge. Pressure mechanism
means at slightly different speeds.
16 includes a supporting structure 26 ordinarily mounted
In an embodiment of the invention, it is contemplated
by means (not shown) permitting slight adjustment in the
that novel means he provided for lubricating each of the
position of the structure relative to the cutting edge of
roll segments. Thus an elongated groove portion is formed
knife 20.
in the cavity mounting each roll segment, and this extends
along the cavity the length of the roll segment. The 65 Considering now specifically the construction of the
pressure mechanism which forms the subject of this in
groove during operation of the lathe is ?lled with lubri
vention, ‘and referring now to FIGS. 1, 2, and 3, extend
cant, and as the roll segment rotates, it acts to transfer
ing along the nose end of structure 26 substantially the
lubricant entirely around the bearing surface mounting
length of cutting knife 20 and adjacent the knife is an
the roll segment. This construction makes unnecessary
the former practice of constantly feeding water over the 70 elongated mounting bar 28. The bar occupies a position
substantially parallel to the cutting edge of the knife.
pressure mechanism. It also enables longer continuous
Formed along the left side of the ‘bar (the side that faces
operation without shutdown time.
‘
3,055,406
3
4.
the knife) is an elongated cavity de?ned by a curving
lubricated, both at their ends and over their cylindrical
surfaces.
wall 30 that curves over an arc of a circle.
Resting with
in this cavity are a series of cylindrical roll segments 32.
The roll segments are relatively short compared to the
length of knife 20 and bar 28. Thus with lathes having
knives from six to twelve feet long, six to eight inch roll
Segments may be employed (it should be understood, of
course, that these dimensions are ‘for purposes of illus
The mounting bar 28 is brought securely into position
against a wall 82 (see FIG. 3) of a seating ledge provided
on supporting structure 26 by means of plural pull studs,
indicated at 84. The pull studs or rods extend trans
versely of the bar and project out from the side opposite
to that side mounting the roll segments. The pull studs
have tapped ends 86 which are screwed into suitably
tration only). The roll segments are aligned with each
other and set end to end so that the line of roll segments 10 threaded bores provided along the length of the mounting
bar. The bodies of the studs extend through bores 88
assume a position parallel to the cutting edge of the knife.
formed in structure 26. Projecting ends of the studs are
Outer surface portions of the roll segments, indicated at
externally threaded, and nuts 92 are tightened onto these
32a in FIG. 3, protrude outwardly beyond the side of
ends to tension the studs and in this way to pull the
the mounting bar that faces the knife. These protruding
portions are the portions of the rolls that roll against the 15 mounting bar snugly against wall 82. A pull rod is
provided bar 28 at the location of each roll segment 32.
surface of a log as it is being processed. The roll seg
As a means for delivering lubricant to the lubricating
ments have inner surface portions (indicated at 32b in
groove portions already discussed, a conduit means is
FIG. 3) that slide against the concavely curved wall 3%}.
provided which extends through the pull studs and
During cutting of veneer, reaction forces produced by a
log force the rolls inwardly against central portions of 20 through the body of the mounting bar. Thus each pull
stud has an elongated bore 96 extending axially through
Wall 30 and thus the wall provides a bearing surface in
its center, and this communicates with one end of an
the construction.
other bore 98 formed in the body of the mounting bar.
The roll segments are constrained to rotation within
The other end of bore 98 communicates with groove 76.
the cavity de?ned by wall 30 by a series of cap sections
36. These are arranged end to end along the top of 25 Lubricant is ejected into the hollow interior of the studs
by suitable dispensing mechanism ?tted over the pro
bar 28, land are detachably secured to the bar. The cap
jecting ends of the studs. After ?lling with lubricant,
sections have overlapping side edge portions 38 that pro
bores 96 may be closed off as by ?ttings 100.
trude outwardly over the cavity de?ned by wall 30.
The construction described has a number of advantages.
These have inner surfaces that are curved as at 40 with
a curvature roughly complementing the curvature of wall 30 For one thing, friction in the lathe is considerably less
than that resulting when a sliding press bar or means is
30. The overlapping portions of the call sections to
employed. The roll segments of the pressure mechanism
gether with wall 30 of the cavity de?ne an elongated,
need not be power-driven, nor need extensive bearing
substantially cylindrical recess along the bar that opens
structure be provided at opposite ends of the supporting
to one side of the bar. Since the cap sections hold the
structure 26 for constraining the rolls. The action of
rolls in place, these together with bar 28 constitute a
each roll is independent of the others, especially because
mounting in the construction.
of the spacers which separate the ends of adjacent rolls.
Each of the cap sections is provided with ‘an elongated
The spacers do not add appreciably to rolling resistance,
ridge 46 and ?ange 48 integral with the cap section and
as provision is made for lubricating the ends of the rolls
extending along the base thereof. The ridge and ?ange
?t within channels 50, 52 provided in the bar. The 4.0 where they contact the spacers.
A supply of lubricant is provided the roll segments
ridge and ?ange when ?tted in the channels lock the cap
through the hollowed-out pull studs and bores described.
sections from lateral movement. Each is detachably se~
The groove along the base of wall 30 holds a supply of
cured to the bar by means of screws 56, one located at
lubricant su?icient to let the machine operate continu
each end of the bar. For small adjustments of the over
ously for a considerable period of time.
lapping side edges of the cap sections relative to the
In the event it is ‘desired to replace any of the roll
wall of cavity 30, a series of adjusting screws 58 is pro
segments, the entire cap assembly need not be removed
vided that have bottom ends bearing against surface 60.
but instead only isolated cap sections. After removal, a
The overlapping edges are adjusted to provide suitable
particular segment is easily taken out of the assembly.
clearance for the roll segments, and to prevent chattering
and looseness of the roll segments.
50 To remount a roll segment, the removed cap sections are
replaced, and by adjustment of screws 56, 58, proper
As best shown in FIGS. 2 and 4, separating adjacent
clearance is provided the newly inserted roll segment.
roll segments is a separator plate or spacer 66. These
It is claimed and desired to secure by Letters Patent:
have enlarged ends 68 that project outwardly into the
1. For a veneer lathe having a frame and elongated
recess de?ned by wall 30 and the overlapping side edges
cutting knife means mounted thereon for cutting veneer
of the cap sections. The spacers also comprise anchoring
from a log, pressure mechanism adapted to be mounted
portions 70 that are inserted into key Ways cut out of
on the lathe substantially parallel to the knife means for
the mounting bar. These are thus held in place by the
bearing against and thus pressing the exterior of a log
bar. By preventing the ends of the roll segments from
during cutting of veneer therefrom, said pressure mech
contacting each other, spacers 60 prevent the various rol1_
segments from spiraling and locking together. Thus each 60 anism comprising an elongated mounting bar means, an
elongated concave cavity formed along one side of the
roll segment rotates independently of the others.
bar means, plural cap sections set end to end on said bar
Extending along the bottom portion of wall 30 sub
means with side edge portions extending over said cavity
stantially parallel to the line of roll segments is an elon
‘and partially closing it off, means detachably securing the
gated groove 76. This groove thus has a portion that
extends along the length of each roll segment. The 65 latter cap sections to said bar means, inner surface por
tions of said cap sections and the wall de?ning said cavity
groove functions as a holding means for storing lubricant
together de?ning an elongated recess means of substan
for the rolls. The rolls pick up lubricant and distribute
tially cylindrical cross section and open along said one
it over the wall 30. The groove is located downwardly
side of the bar means, plural cylindrical roll members con
from that portion of Wall 30 which takes the largest bear
ing stress during operation of the lathe. The spacers or 70 strained to rotary movement Within said recess means and
set end to end along a line within said recess means,
divider plates have centrally located bores 78 and radially
spacer plates between said roll members ?tted into said
extending cutouts 80 formed therein. The cutouts and
recess means and extending transversely thereof and an
bores provide a passage for lubricant enabling it to work
chored against lateral movement in said bar means, an
up from the grooves over the end surfaces of the various
roll segments. In this way the roll segments are fully 75 elongated groove portion for each of said roll members
5
8,065,406
formed along the length of that portion of the recess
means containing the roll members, and lubricant de
livery conduit means extending through the bar means
connecting with the groove portion provided for a roll
member.
2. The pressure mechanism of claim 1 wherein the bar
means is provided with adjusting studs set transversely
of the bar means and projecting out from the side op
posite to said one side, and wherein the lubricant delivery
conduit means comprises a bore extending axially through
6
chored in said bar with portions dividing said elongated
recess means into compartments, and a cylindrical roll
mounted within each of the said compartments and con
strained to rotary movement therein, the roll having sur
face portions protruding outwardly of said one side of
the bar.
5. The construction of claim 4 which further comprises
a lubricating groove portion provided for each roll and
formed in the concavely curved Wall de?ning the cavity,
and conduit means for delivering lubricant to the groove
a stud and another bore connecting an end of the ?rst
mentioned bore and said groove portion.
3. Pressure mechanism for a veneer lathe adapted to
portion.
rotary movement within said recess means and set end to
lel to the knife means and with one side thereof facing
6. The device of claim 5 wherein said conduit means
comprises an adjusting stud secured to the bar extending
be mounted adjacent and substantially parallel to the
transversely of the bar and outwardly from the side of
knife of the lathe and for bearing against and thus press 15 the bar opposite said one side, a bore extending axially
ing the exterior of a log during cutting of veneer there
through said stud, and another bore formed in the bar
from, said pressure mechanism comprising an elongated
connecting the bore of the stud with the groove portion.
mounting bar adapted to be set with one side thereof
7. For a veneer lathe having elongated cutting knife
facing the knife of the lathe, elongated recess means pro
means for cutting veneer, pressure mechanism for engag
vided along one side of the mounting bar of substantially 20 ing the surface of a log during cutting of veneer there
cylindrical cross section and opened up along its length
from, said pressure mechanism comprising an elongated
to said one side of the bar, plural rolls constrained to
bar adapted to be mounted on a lathe substantially paral
end therealong, and separator plates anchored in said
the knife means, an elongated, concavely curved cavity
mounting bar arranged transversely of the rolls, at least 25 formed along one side of the bar, plural cap sections set
one between each roll, and spacing the ends of the rolls
end to end with side edge portions extending over said
from each other.
cavity and partially closing it oif, means detachably se
4. In combination with a veneer lathe having cutting
curing the latter sections to the bar, inner surface por
knife means for cutting veneer from a log, pressure mech
tions of said cap sections and said cavity together de?ning
anism engaging and thus pressing against the external 30 an elongated recess of substantially cylindrical cross sec
surface of a log during cutting of the veneer therefrom,
tion and opened along said one side of the bar, plural
said pressure mechanism comprising an elongated mount_
cylindrical roll members set end to end constrained to
ing bar positioned substantially parallel to the knife means
rotary movement within said recess, and separator plates
separating the ends of the roll members, at least one be
gated, concavely curved wall de?ning a concave cavity 35 tween each adjacent set of ends of roll members, said
and having one side facing the knife means, an elon
separator plates being anchored in said bar.
formed along said one side of the bar and extending sub
stantially along the length thereof, plural cap sections set
References Cited in the ?le of this patent
end to end with side edges thereof overlapping said cavity,
said overlapping edges of the cap sections together with
UNITED STATES PATENTS
the wall de?ning said cavity de?ning an elongated recess 40
1,016,737
Caulston _____________ __ Feb. 6, 1912
means along said one side, means detachably securing the
1,625,881
Buss et a1 _____________ __ Apr. 26, 1927
cap sections to said bar, means for adjusting the position
1,641,452
Osgood ______________ __ Sept. 6, 1927
of the overlapping edges of the cap sections relative to
1,804,704
Osgood ______________ __ May 12, 1931
the wall de?ning said cavity, plural separator plates an
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