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Патент USA US3078897

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Feb. 26, 1963
'
E. M. HETH
'
3,073,337 '
LATHE WITH'LOG-SUPPORTING MECHANISM
Filed March 7, 1961
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2 Sheets-Sheet 1
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Edwin M.H€ 'l'h
INVENTOR.
Feb. 26, 1963
3,078,887
E. M. HETH
LATHE WITH LOG-SUPPORTING MECHANISM
Filed March 7, 1961
’
2 Sheets-Sheet 2
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Edwin M.Hefh
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INVENTOR.
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United States Patent Office
1
3,?78,887
Patented Feb. 26, 1963
2
steadying means or mechanism of the type contemplated,
$378,887
LATER WITH LUG- UPPURTING MECHANESM
Edwin M. l-leth, Portland, Greg, assignor to Premier
Gear & Machine Works, lno, Portland, 0reg., a cor
poration of Oregon
Fiied Mar. 7, 1961, Ser. No. 93,922
12 Claims. (Ci. 144-209)
that may be actuated so as to assist in the removal of a
?nal core, and then cleared rapidly from between the
chucks of a lathe to free the lathe for the reception of a
new log.
In a more speci?c sense, it is an object of this inven
tion to provide a lathe which includes, as support mech
anism for a log, an elongated extensible-retractable arm,
This invention relates to veneer lathes, and more par
mounted for pivotal movement about an axis paralleling
ticularly to a lathe that includes means for supporting 10 and above the axes of the chucks of the lathe, such axis
intermediate portions of a log during the cutting of veneer
being on the side of the lathe opposite the side on which
therefrom, whereby better cut veneer results and the log
the knife and roller bar are disposed. The arm is swing
can be reduced to the smallest possible core.
able from a raised position where its free or nonpivoted
The usual veneer lathe has a pair of pedestals mount~
end is above the lathe, to a lowered position where the
ing spaced-apart and opposed chucks that hold the ends 15 free end thereof is adjacent the periphery of a log. The
of the log during the cutting of veneer therefrom. Typi
extensible-retractable arm has means provided its non
cally a carriage is provided the lathe, and mounting a
pivoted end for contacting a log and exerting a pressure
knife and pressure bar, is advanced toward the log, with
thereon, such pressure being exerted during lathe opera
the knife cutting veneer and with the pressure bar exerting
tion in a direction coinciding with the direction in which
a pressure on and steadying the log during cutting. The 20 the arm is extensible.
knife and bar exert forces on the log intermediate where
Another object is to provide a lathe with such an arm
its ends are held by the lathe chucks, and consequently
for providing support, wherein power-operated means is
there is a tendency for the middle part of the log to be
provided for swinging the arm between raised and low
pushed outwardly from alignment with the chuck cen
ered positions, and the arm has a pivot axis so located
ters, particularly evident when the log is peeled down 25 that the free end of the arm, in ‘moving toward a raised
to a relatively small core. To correct these tendencies,
it has been suggested that some kind of support or “steady
rest” be provided the log, operable to counteract these
dislocating forces that otherwise cause the log to bow
outwardly.
position, moves in a direction toward and then over the
knife, so that the space between the lathe chucks is im
mediately cleared for the supply of a new log to a lathe.
Another object is to provide a lathe with steadying
30 mechanism for a log, where such mechanism comprises
Generally, it is an object of this invention to provide
an elongated arm, and a pair of power-operated means
improved means for steadying or supporting portions of
a log extending between the chucks of a lathe during
the cutting of veneer therefrom.
In the typical lathe, the knife and pressure bar are dis
posed at a height that approximately corresponds to the
elevation of the center axes of the chucks. The knife
and bar are advanced inwardly on a log, from a position
for placing the end of the arm in an inoperative, out of
the way position, one of these power-operated means
being effective to swing the arm in an arc upwardly and
the other being effective to withdraw the end backwardly
along the length of the arm.
Still a further object is to provide a novel construction
for an extensible-retractable arm, used as steadying mech—
they have to one side of the chucks, and the log is ro
anism in a lathe, where the arm is well suited to with
tated so that its surface is moving down on the knife 40 stand the stresses and strains it normally is subjected to
during cutting. As a result, forces are exerted on the
during the peeling of veneer from a log.
log that have a direction extending upwardly and toward
These and other objects and advantages will become
the side of the chucks opposite the side where the knife
more apparent, as the following description is read in
is disposed. Steadying means for a log preferably should
conjunction with the accompanying drawings, wherein:
be such that a substantially uniform amount of support 45
FIG. 1 is a view of the back of a lathe, such lathe
be provided the log, regardless of variations in diameter.
being provided with log steadying mechanism constructed
To enable most simply that such support be provided
according to one embodiment of this invention;
a log, and included in the objects of this invention, this
FIG. 2 is a view of one side of the lathe shown in
invention contemplates the provision of support mech
FIG. 1, with portions removed therefrom;
and the log’s diameter becomes smaller, along substan
FIG. 3 is a view, somewhat enlarged and with por
tions removed, of an elongated extensible-retractable arm
anism that moves inwardly on a log, as veneer is removed 50
tially a straight path, such path approximately coinciding
with the direction of the forces exerted on the log by
the action of the knife. Regardless of log diameter, the
present in the construction; and
PEG. 4 is an enlarged, cross-sectional view, taken along
support mechanism exerts a total force on the log that
the line 4—4 in FIG. 3.
Referring now to the drawings, at 10 there is indicated
extends in a direction approximately opposite to the di
rection of the total force exerted on the log by the action
of the knife and pressure bar.
Another factor to be considered in the construction of
mounted on frame 12 and spaced from each other a pair
pedestals 14, 16 are opposed and spaced-apart chucks 18,
from the lathe after all veneer has been cut therefrom,
aligned and horizontally disposed. The location of these
and a new log substituted for the core removed. Maxi
mum production is possible if this substitution of a new
axes is indicated in FIG. 2 at 17. The usual mechanism
(not described as it forms no part of the invention) is
generally a lathe, such lathe having a base frame 12 and
of opposed pedestals 14, 16. Projecting inwardly from
a lathe, is the ease with which a core may be removed 60 20, such chucks typically having center axes that are
log is made as speedily as possible. To facilitate removal
provided for moving the chucks toward and away from
of a core, it is sometimes advantageous, after loosening
each other, to hold and to release a log, respectively.
of the chucks, to extend the means used for steadying
Power-operated means (not shown) is provided for ro
the core, so that it performs the additional function of
tating the chucks, whereby a log held by the chucks is
pushing the core out from between the chucks. After
rotated about an axis coinciding with the aligned center
this, the steadying means should be retracted swiftly, to
axes of the chucks, such axis therefor also being desig
clear quickly the space between the chucks for a new 70 nated at 17 in FIG. 2 (during operation of the lathe, the
log. Accordingly, it is another object of this invention
log is rotated in a clockwise direction in FIG. 2).
to provide an improved construction for support or
Lathe 10 includes a carriage shown in outline at 28',
3,078,887
3
that is movable to and fro between the pedestals by means
of feed screws such as feed screw 30, thus to position a
log supported on chucks 18, 20 relative to the carriage.
Mounted on the carriage, and indicated at 32, 34, respec
tively, are the usual knife and pressure bar. The knife
and pressure bar substantially parallel a log on the lathe
and are positioned approximately at the height of the
center axes of the chucks. As the outside of a log revolves
against the knife and bar, a sheet of veneer is produced,
4
movement of the plates is limited by stops 88 projecting
inwardly from plates 80. The rollers in an operative posi
tion for arm 52, as can be seen with reference to the
dashed outline of the arm in FIG. 2, rotate about axes
that parallel a log being cut, and constitute the means in
the mechanism actually contacting a log when the same
is being steadied.
Extension of the sections, and retraction, is produced
by a ?uid-operated jack or ram, indicated at 100, disposed
with the log progressively getting smaller in diameter as 10 within sections 58, 60, so that the ram is protected by
veneer is removed.
As so far described, the lathe is conventional, and thus
it has not been described in too great detail. In general
terms, it may be said that the lathe is typi?ed by a knife
and pressure bar disposed to one side and at approximately
the height of the center axes of the chucks, that are ad
vanced into the outside of a log, with the logs surface
moving downwardly on the knife and bar, to produce a
sheet of veneer.
the sections. The cylinder end of ram 100 is pivotally
connected to end wall 65 of outer section 58, whereas the
rod end is pivotally connected to plate 72 of inner sec
tion 60. End plate 70 of section 60 has an aperture 102
formed therein which accommodates the connection of
ram 100 with end wall 65.
Means is provided for swinging the arm between the
raised‘ position shown in solid outline in FIG. 2 and the
lowered position indicated in dashed outline. Thus, a
During the cutting of veneer, because of the pressure 20 ram or jack 110, is included, that has its rod end con
nected by pivot connection 112 to outer section 58, and its
exerted by the knife and bar on the log and because of
cylinder end connected by pivot connection 114 to a beam
the downward movement of the log surface on the knife,
116 which is part of elevated frame 42.
a force is exerted on the log which extends generally up
Explaining now the operation of the apparatus de
wardly and to the left, viewing the lathe as in FIG. 2.
Such force tends to produce bowing in the log, particu
larly when it has been reduced to a core of relatively
small diameter. To inhibit such bowing tendencies, a
scribed, with the arm raised and in its inoperative posi
tion, it is out of the way of the space between the chucks,
which enables a log to be supplied the lathe and properly
positioned on the chucks. During cutting of veneer, and
support or steady rest mechanism for the log is provided,
before the log is reduced to a core of small diameter, ram
indicated generally at 40, which is used to brace the log
110 and ram 100 may be actuated, causing the arm to
30
between its ends.
swing to its lower position and to extend, to place rollers
Speci?cally, 42 indicates an elevated frame, supported
82, 83 in rolling contact with the periphery of the log.
above the ?oor by legs 44. The frame is above the chucks,
In such position, the rollers function to support the log,
and extends to the left of chucks, viewing the lathe as in
by exerting a force on the log that counteracts forces
FIG. 2. The elevated position of the frame enables new
exerted on the log by the knife and roller bar. When cut
logs to be supplied the lathe, moving the logs in from the
ting of veneer is ?nished, the lathe chucks may be re
left in FIG. 2, without encumbrance by the frame.
tracted, and ram 100 may be extended to its full extent,
Frame 42 includes an elongated beam 46 that substan
to assist in freeing the core remaining from the chucks.
tially parallels a log in the lathe, and extends between the
Arm 52 may then be quickly moved out of the way, by
lathe pedestals. Disposed above chucks 18, 20 and sub
simultaneous retraction of rams 100, 110, with the free
stantially midway between them, and pivotally connected
end of the arm retracting and also swinging upwardly.
to beam 46, by pivot means 48, is an elongated extensible
It will be noted that the construction has several ad
retractable mechanism or arm 52. Pivot means 48 is
vantages. The arm is extensible along a straight path that
above and to the left of the chucks in FIG. 2, which en
approximately coincides with the direction of the forces
ables mechanism 52 to be swung from the inoperative
position shown in solid outline in FIG. 2, downwardly 45 exerted on the log by the knife and pressure bar. This
facilitates the application of a steady, even pressure on
with its nonpivoted or free end moving in an are as indi
the log. It should be noted also that since the arm is
cated by the arrows in FIG. 2. In its lowered position,
swung toward the knife and upwardly in moving to a re
shown in dashed outline in FIG. 2, the free end of arm
tracted position, there is almost immediate clearance of
52, pivot means 48, and axis 17 are in substantial align
ment. The arm in its lowered position extends upwardly 50 the space between the chucks of the lathe after the re
moval of the core. This is so, even if the mechanism is
from a log in a direction substantially coinciding with the
relied upon to assist in clearing the lathe. Note also that
direction of the forces exerted on a log by knife 32 and
the bar during cutting by the knife.
Arm 52 comprises a pair of rigid, telescopic sections
58, 60, each of which has a substantially rectangular
cross section, as can be seen with reference to FIG. 4.
Inner section 60 is slidably received within outer section
58. The sections are extensible and retractable with re
spect to each other, and are shown in their relatively con
tracted position in FIG. 3.
both retraction of the arm and swinging of the arm can
be utilized in clearing the space between the lathe chucks.
The telescopic sections have the requisite rigidity to
withstand shocks and stresses imparted thereto. They are
easily shifted to a fully extended position. The ram pro
ducing extension and retraction of the sections is fully
protected from stresses by the telescopic sections that
60 encompass it.
I claim:
1. In a veneer lathe having opposed spaced-apart
tions 58, 60. In the embodiment illustrated, the outer
chuck-s for holding the ends of a log and rotating it about
section has topand bottom walls 61, 62 and opposed side
a rotation axis extending between the chucks, and a
walls 63, 64 forming an enclosed box-like structure, closed
at its left end in FIGS. 2 and 3 by end wall 65. Inner 65 knife extending between and positioned laterally to one
side of the chucks for cutting a sheet of veneer from the
section 60 comprises opposed, approximately channel
Various forms of constructions may be used for sec
log, support means for the log comprising elongated
shaped members 67, 68, held together by end plates 70,
power-operated lineally extensible mechanism positioned
71 and intermediate plate 72 (see FIG. 3).
intermediate the ends of the knife and laterally to the
Secured to the outside of and extending forwardly from
inner section 60, and part of the section, are plates 80 70 other side of said chucks from said kuife, means disposed
on said other side of said chucks and above the chucks
(the plate 80 on the rear side of section 60 is obscured in
pivotally
mounting one end of said mechanism and ac
FIGS. 2 and 3). Pivotally mounted on these plates, by
commodating pivotal movement of the mechanism about
pivot connections 86, are mounting plates 84. The mount~
an axis substantially paralleling said rotation axis, the
ing plates 84 extend forwardly of the pivot connections
86, and have rollers 82, 83 journaled thereon. Pivotal 75 end of said mechanism opposite said one end being swing~
‘3,078,887
‘6
‘operated ram pivotally connected‘ at'oneend to said arm
and pivotally connected at its other end to said support.
‘5. In a veneer lathe having opposed spaced-apart
, able in an are from a raised position disposed above ,the
chucks downwardly to a position where said opposite
end is adjacent said rotation axis, means provided said
opposite end of the mechanism for contacting the, log
.and operable to exert. a pressure against the log, and '
power-operated means connected to said extensible
mechanism for swinging it in said arc.
2. In a veneer lathe ‘ having opposed spaced-apart
chucks for holding thejendsgof a log and rotating it
about a- ‘rotation axis-extending between the chucks,land
a'knife extending between and positioned laterally to one
'‘ side of the chucks for cutting a sheet of veneer from the
‘log, support means for ' the log comprising elongated
power-operated extensible-retractable ‘mechanism posi
chucks for holding the ends of a log and rotating it about
:a rotation axis extending between'the chucks, and a 10 tioned intermediate the ends of the knife and laterally to
the other side of said chucks from said knife, said mecha
knife extending between and positioned laterally to one
nism comprising a pair of- rigid sectionswith one ‘mounted
side of the chucks for cutting, a sheet of veneer from the
on the other and slidable relative to the other to produce
log, means fornsupporting the log at a location inter
mediate'its ends comprising‘an elongatedlineally ex
extension and retraction of the mechanism, ‘and a-‘?uid
tensible armincluding means for extending said arm, 15' operated ram mounted'with one end‘ connected to ‘one
of said sections and the other end connected to the other
‘pivot means disposed above the chucks pivotally mount
of said sections operable on' actuation to produce exten
ing one end of said arm with the arm depending from
the pivot‘means and in a position'where the end opposite
sion and retraction of the sections, means disposed on said
said one. end may swing'in an'arc toward and then above
other side of said chucks and-above'the chucks pivotally
mounting one end of said mechanism and accommodating
said knife on pivotal movement of the arm, means on
said .opposite end of said arm for contacting a log and
pivotal movement of the mechanism aboutean axis sub
operable to exert a pressure on the, log, and power-oper
stantiallyvparalleling said rotation axis, the-end of‘said
mechanism opposite said one end being swingable in an
arc from a raised positiondisposed above the chucks
ated‘means'connected to said arm for swinging it in said
arc.
3. In a veneer lathe “having opposed spaced-apart 25 downwardly to a-position-where said opposite end is
chucks for holding the ends of a log and rotating it ‘ adjacent said rotation axis, means provided said opposite
about a rotation axis extending between the. chucks, and
end of said mechanism for contacting the log and operable
a knife extending between and positioned laterally to one
to exert’ a pressure against'theflog, and power-operated
side of the chucks vfor cutting a sheet of veneer from a
log, means for supporting the log at ‘a location inter
' means connected to said'mechanism/for swinging it in
30 said are.
mediate its ends, said means comprising an elongated
>6.*The1 lathe 0f'claim‘5 wherein an’ elevated‘ frame'is
arm having a pair of rigid sections, one forming one end
provided above said chucks and wherein the power-oper
and one forming the other end of said arm, said sections
ated means for swinging the mechanism in said are com
being mounted with one section slidable relative to the
prises a ?uid-operated ram pivotally connected at one of
other whereby the arm is extensible and retractable, a 35 its ends to one of said sections at the other of its ends
?uid-operated ram mounted on said arm with one end
to said elevated frame.
secured to one of said sections and its opposite end se
7. In a veneer lathe having opposed spaced-apart
cured to the other of said sections and operable on ac
chucks for gripping the ends of a log and for rotating
tuation to produce extension and retraction of the arm,
it about an axis extending between the chucks, and a
pivot means disposed above the chucks pivotally mount
40
knife extending between and positioned laterally to one
ing the section forming one end of the arm with said
side of the chucks for cutting a sheet of veneer from
arm depending from said pivot means and in a position
the log, an elevated frame supported above said chucks
where the end of the arm opposite said one end may
and to the other side of said chucks from said knife, an
swing in an arc toward and then above said knife on piv
elongated lineally extensible arm, means pivoting one
otal movement of the arm, means on said opposite end 45 end of said arm on said elevated frame at a location
of said arm for contacting a log and operable to exert
disposed above said chucks and on said other side of
a pressure on the log, and power-operated means con
said chucks, said arm having an end opposite said one
nected to said arm for swinging it in said arc.
end that is swingable in an are between a raised position
4. In a veneer lathe having opposed spaced-apart
above said chucks and a lowered position where said
chucks for holding the ends of a log and rotating it
opposite end and said one end are substantially aligned
about a rotation axis extending between the chucks, and
with the log rotation axis, power-operated means mounted
a knife extending between and positioned laterally to
on said arm for producing extension and retraction there
one side of the chucks for cutting a sheet of veneer from
of, means on said other end of said arm for engaging
the log, means for supporting the log at a location inter
a log and exerting a pressure thereon, and power-operated
mediate its ends, said means comprising an elevated 55 means interposed between said arm and said elevated
frame disposed above and to the other side of said
frame for swinging said arm between its raised and low
ered positions.
chucks from said knife, an elongated arm having a pair
8. In a veneer lathe having opposed spaced-apart
of rigid sections, one forming one end and one forming
chucks for gripping the ends of a log and for rotating
the other end of said arm, said sections being mounted
it about an axis extending between the chucks, and a
with one slidable relative to the other whereby the arm
knife extending between and positioned laterally to one
is extensible and retractable, a ?uid-operated ram
side of the chucks for cutting a sheet of veneer from
mounted on said arm with one end secured to one of
the log, an elevated frame supported above said chucks
said sections and its opposite end secured to the other
and to the other side of said chucks from said knife, an
of said section and operable on actuation to produce exten
sion and retraction of the arm, pivot means disposed 65 elongated extensible-retractable arm, said arm being
formed of a pair of hollow telescopic sections, one re
above the chucks pivotally mounting the section forming
ceived within the other, with the sections extensible and
one end of the arm with said arm depending from said
retractable relative to each other, means pivoting one end
pivot means and in a position where the end opposite
of said arm by pivotally mounting one of the sections
said one end may swing in an arc toward and then above
70 on said elevated frame and at a location disposed above
said knife on pivotal movement of the arm, means on
said chucks and on said other side of said chucks, said
said opposite end of said arm for contacting a log and
arm having an end opposite said one end that is pro
operable to exert a pressure on the log, and power
vided by said other section and is swingable in an are
operated means connected to said arm for swinging it in
between a raised position above said chuck and a lowered
said arc, said power-operated means comprising a ?uid 75 position where said opposite end and said one end are
3,078,887
of the arm substantially aligned with the rotation axis
. one end, power-operated means for producing extension
of the log, a ram disposed within said telescopic sections
and shielded thereby, means connecting one end of said
of said opposite end of said arm from said one end,
ram to one of said sections and the other end of the
ram to the other of said sections whereby actuation of
the ram produces extension and retraction of the arm,
means on said opposite end of said arm for engaging a
log and exerting a pressure thereon, and power-operated
and means on said opposite end of said arm for contact
ing the log and operable to exert a force on the log,
said opposite end of said arm with the arm in operative
position and supporting a log being extensible in a di
rection ‘substantially opposite to the direction of the total
force exerted on the log by the cutting assembly of the
lathe.
means interposed between said arm and said elevated
12. In a veneer lathe having opposed spaced-apart
frame for swinging said arm between its raised and low 10
chucks for holding the ends of a log and rotating it
ered positions.
about a rotation axis extending between the chucks, and
9. The lathe of claim 8 wherein the means for swing
a cutting assembly extending between the chucks and p0—
ing said arm comprises a ?uid-operated ram with a cylin~
sitioned laterally to one side of said axis, means for sup
der end pivotally connected to said elevated frame and a
rod end pivotally connected to one of said telescopic 15 porting a log in the lathe comprising an elongated arm
positioned laterally to the other side of said rotation axis
sections.
from said cutting assembly, means mounting said arm
10. The lathe of claim 8 wherein the means for con
with the arm projecting out from its mounting toward
tacting a log comprises a pair of rolls spaced one from
the other and substantially paralleling said rotation axis,
said rotation axis in a direction substantially opposite
and a mounting for the rolls pivotally mounted on said 20 to the direction of the total force exerted on a log by the
cutting assembly of the lathe, said arm terminating in an
other section.
end adjacent said rotation axis that is extensible lineally
11. In a veneer lathe having opposed spaced-apart
in the same direction that the arm projects from its
chucks for holding the ends of a log and rotating it
mounting, means on said end for contacting a log and
about a rotation axis extending between the chucks, and
exerting a force thereon, and power-operated means for
a cutting assembly extending between the chucks and po
producing extension of said arm.
sitioned laterally to one side of said axis, means for sup
porting a log in the lathe comprising an elongated arm,
References Cited in the ?le of this patent
means pivotally mounting one end of said arm at a point
spaced laterally toward the opposite side of said rota
UNITED STATES PATENTS
tion axis from said one side, said arm having an end 30 2,884,966
Zilm _________________ __ May 5, 1959
opposite said one end that is lineally extensible from said
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