Sharpener for veneer knife

Details Sharpener for veneer knife Sharpener for veneer knife

2000-03-08

2001-07-10

Morgan, Eileen P. (Department: 3723)

Abrading

Frame or mount

Portable abrader

C451S358000, C451S359000, C451S419000, C451S262000, C451S293000, C451S192000

Reexamination Certificate

active

06257967

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to a method and apparatus for sharpening elongate cutting edges such as used for peeling veneer off logs.
BACKGROUND OF THE INVENTION
Plywood is made of multiple laminated sheets of veneer which is a thin layer of wood peeled from a log. The process of producing veneer involves mounting an 8′ long log that is substantially cylindrical into a veneer lathe. The log is clamped at its ends and rotated against an 8′ long veneer knife. The knife is controllably moved against the log, first peeling off surface portions to round up the log and make it truly cylindrical with the cylindrical axis coinciding with the axis of rotation. Thereafter the knife produces a continuous sheet, e.g., 8′ wide and ⅛″ thick of the veneer which is conveyed through a cut off knife, cutting the sheet into 4′ lengths. After drying, the sheets are stacked, e.g., with three or five sheets to a stack, and glued together to produce the plywood (3 ply, 5 ply, etc.).
The quality of the plywood sheets is dependent on the production of the consistent thickness of the veneer sheets. The consistent thickness of the veneer sheets is largely dependent on the controlled cutting of the log and this requires a veneer knife having a straight, consistently sharpened cutting edge.
Whereas such cutting edges have heretofore been sharpened by hand requiring substantial man hours and significant cost, an objective of the present invention is to automate or partially automate the sharpening process.
BRIEF DESCRIPTION OF THE INVENTION
The preferred embodiment of the present invention is a portable powered sharpening tool that rotatably drives a pair of sharpening stones. The sharpening stones are mounted for cooperative sharpening at the two sides of a cutting edge of a veneer knife.
With reference to the figures,
FIG. 2
is an end view of a typical veneer knife
10
. The cutting edge
12
is formed by the two angled faces
14
,
16
. The angled faces are precisely formed which requires precise grinding of the faces
14
,
16
when sharpening.
FIG. 6
illustrates a sharpening tool
18
of the present invention mounted onto the cutting edge of the knife. With reference to
FIG. 3
, it will be noted that a primary rotary sharpening stone
20
is rotatably mounted to and driven by power tool (power head), e.g., an air drill
22
. A mounting bracket
24
secured to the air drill rotatably carries a secondary sharpening stone
26
. The secondary stone
26
has a biased face
28
that engages an inset face
30
of the primary stone
20
. Rotation of the primary stone
20
produces rotation of the secondary stone
26
through engagement of biased face
28
with inset face
30
.
As seen in
FIG. 6
, the bracket
24
carries a rod
32
that extends along the edge
12
. The rod
32
carries outrigger clamps
34
including posts (gauge members)
36
that are suspended over but in close proximity to the cutting edge
12
.
The tool is mounted with the rim
38
that surrounds inset
30
being supported on face
14
and stone
26
is supported on face
16
. The axes
40
,
42
intersect the cutting edge
12
. A sharpening slurry is applied to the faces
14
,
16
and the operator while gripping handles
60
,
64
simply moves the tool along the edge as the rotating stones
20
,
26
sharpens that edge. The stones have a porous surface, e.g., cast iron, which absorbs the graphite slurry (the slurry becomes imbedded in the pores of the iron).
The invention will be more fully understood upon reference to the following detailed description having reference to the accompanying drawings.


REFERENCES:
patent: 332187 (1885-12-01), Comstock
patent: 929785 (1909-08-01), O'Brien
patent: 2026096 (1935-12-01), Muhlbauer
patent: 2052365 (1936-08-01), Stukart
patent: 2077689 (1937-04-01), Grobstein
patent: 2742742 (1956-04-01), Barrett
patent: 2993312 (1961-07-01), Holland et al.
patent: 3122865 (1964-03-01), Kolling
patent: 3800480 (1974-04-01), Keating
patent: 4934108 (1990-06-01), Hall
Brochure —Doyle Tool & Gauge Co. —Lathe Knife Honer —Part No. DT-2040.
Brochure —Doyle Tool & Gauge Co. —Lathe Knife Micro Beveler.

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