Woodworking – Veneer lathe – Presser bar or roll
Reexamination Certificate
2000-08-10
2002-03-19
Bray, W Donald (Department: 3725)
Woodworking
Veneer lathe
Presser bar or roll
C144S209100, C144S365000
Reexamination Certificate
active
06357496
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a veneer lathe (peeling machine) for cutting (peeling) a veneer by making use of a cutting knife from a rotating log.
As disclosed in U.S. Pat. No. 4,219,060; U.S. Pat. No. 4,221,247; and Japanese Patent S59-45484, there is known a veneer lathe comprising a roller disposed substantially parallel with the linear cutting edge of the knife and provided with a large number of driving members which are arranged at intervals along the axial direction of the roller, each driving member being provided along the circumference thereof with a large number of piercing projections, and a guiding member for guiding a veneer that has been cut by the knife to run along the driving members.
The aforementioned conventional veneer lathe is constructed as shown in
FIG. 13
illustrating a partial enlarged view thereof and also in
FIG. 14
illustrating a partial cross-sectional view as it is viewed in the direction of the arrow from the dot and dash line K—K in FIG.
13
. By the way, a veneer
111
to be explained hereinafter is omitted in FIG.
14
.
Referring to
FIGS. 13 and 14
, the veneer lathe comprises a cutting knife
103
, and a roller disposed substantially parallel with the linear cutting edge of the knife
103
and provided with a large number of piercing rolls
105
each functioning as a driving member which are arranged, through the interposition of a ring-shaped spacer
106
, at intervals along the axial direction of a rotary shaft
107
to be rotationally driven by a driving source (not shown), each piercing roller
105
being provided along the circumference thereof with a large number of piercing projections
105
a
, and both knife
103
and roller being mounted on a knife carriage
101
. This roller is positioned so as to enable the piercing projections
105
a
to pierce not only the outer peripheral wall portion of a log
109
in the vicinity of the cutting edge of the knife
103
but also a portion of the veneer
111
which is located immediately after the cutting thereof during the cutting operation of the log
109
.
In the space between neighboring piercing rolls
105
, there is disposed a nose bar
113
, upper end portion of which is fixed to a portion of the knife carriage
101
and the lower end of which is designed to be press-contacted with an outer peripheral wall portion of the log
109
which is located immediately before being cut by the cutting knife
103
.
In conformity with each nose bar
113
, a stripping member
115
having a stripping face
115
a
for separating the veneer
111
from the piercing projections
105
a
of piercing rolls
105
is attached to the knife carriage
101
. Furthermore, a concaved member
101
a
and a guiding member, both of which are designed to guide the veneer
111
that has been cut by the cutting knife
103
to run along the piercing rolls
105
, are attached to the knife carriage
101
.
In this case, as explained hereinafter, the veneer
111
is completely press-contacted with the stripping face
115
a
of stripping member
115
so as to form slits
111
a
on front surface of the veneer
111
, or the surface facing the stripping face
115
a
, and furthermore, for the purpose of enhancing the effect of flattening the veneer, the distance between the tip end of the piercing projections
105
a
and the concaved member
101
a
or the guiding member
117
is usually made smaller than the thickness of the veneer
111
.
By making use of the veneer lathe having the aforementioned structure, the piercing rolls
105
is allowed to rotate and at the same time, the log
109
is allowed to rotate by means of a spindle (not shown) while controlling a synchronizing mechanism (not shown) in such a manner that the peripheral speed of the log
109
becomes always identical with the peripheral speed of the piercing rolls
105
, under which conditions, the knife carriage
1
is moved at ratio of 3.5 mm per rotation of the log
109
.
As a result, as shown in
FIG. 13
, the outer peripheral wall of the log
109
is permitted to be pierced by the piercing projections
105
a
of the piercing rolls
105
as shown in
FIG. 13
, thereby giving a rotational force to the log
109
also from the piercing rolls
105
and allowing the log
109
to be cut by the knife
103
with the peripheral surface of the log
109
being pressed by the chip
113
a
of nose bar
113
, thus obtaining the veneer
111
having a thickness of 3.5 mm for instance.
In this case, the veneer
111
is pierced by the piercing projections
105
a
and allowed to move as guided by the concaved member
101
a
and the guiding member
117
to the stripping member
115
, which enables the veneer
111
to be separated from the piercing projections
105
a
and bent to form slits
111
a
in the veneer
111
. As a result, it is possible to obviate the generation of so-called curling phenomenon or a phenomenon of causing the veneer to be rounded into a cylindrical configuration, thus making it possible to obtain a flat veneer, which makes it easy to work the veneer in the following steps.
As explained above, the provision of these concaved member
101
a
, guiding member
117
and stripping member
115
is certainly important in the aforementioned veneer lathe. However, due to the piercing by the piercing projections
105
a
of piercing rolls
105
, a large number of scars are caused to be formed on the front surface of the veneer
111
.
As in a case where a face sheet to be employed as a front sheet of plywood for example is to be produced in the aforementioned veneer lathe, it is sometimes desired to obtain a veneer
111
having a flat front surface which is free from any pierced scar due to the piercing projections
105
a
of piercing rolls
105
. According to the conventional veneer lathe however, even if the rotational axis
107
of the piercing rolls
105
is moved away from the log
109
from the state shown in
FIG. 13
, i.e. moved in the rightward direction in
FIG. 13
, thus separating the piercing projections
105
a
from the log
109
as shown in
FIG. 15
, it is impossible, due to fact that the concaved member
101
a
constituting a guide member and the guiding member
117
are located along the transferring direction of veneer, to avoid the pierced scar by the piercing rolls
105
from being formed in the front surface of the veneer
111
.
Namely, in the state shown in
FIG. 15
, the log
109
can be prevented from being pierced by the piercing projections
105
a
. However, since the distance between the tip end of the piercing projections
105
a
of the piercing rolls
105
and the concaved member
101
a
or the guiding member
117
cannot be changed substantially, the veneer
111
is caused to be pierced by the piercing projections
105
a
as it passes through the concaved member
101
a
or the guiding member
117
, thereby leaving pierced scars on the surface of the veneer
111
.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to provide a veneer lathe which is capable of producing a veneer which is free from the aforementioned pierced scars in spite of facts that the veneer lathe is provided with a driving member such as the aforementioned piercing rolls
105
and with a guiding member such as the concaved member
101
a
or the guiding member
117
.
Namely, the veneer lathe according to the present invention comprises; a knife for cutting a log; a roller disposed substantially parallel with the linear cutting edge of the knife and provided with a large number of driving members which are arranged at intervals along the axial direction of the roller, each driving member being provided along the circumference thereof with a large number of piercing projections; a driving mechanism attached to the roller; a pressure member disposed at a location which enables the pressure member to press-contact with the outer peripheral wall of the log through a plurality of spaces formed between said driving members neighboring to each other of the roller; a guiding member for guiding a veneer which is cut by means of s
Armstrong Westerman & Hattori, LLP
Bray W Donald
Meinan Machinery Works Inc.
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