Woodworking – Planer – Adjustable cutter
Reexamination Certificate
2000-10-13
2001-08-28
Bray, W. Donald (Department: 3725)
Woodworking
Planer
Adjustable cutter
C033S642000, C033S791000, C083S522190, C144S117100, C144S373000, C409S210000
Reexamination Certificate
active
06279628
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a wood planing machine, more particularly to a wood planing machine with improvement relating to a thickness adjustment device.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional wood planing machine is shown to include an elongated machine base
10
, left and right pairs of posts
13
, vertical left and right threaded rods
16
, a cutter carriage
12
, a cutter unit (not visible), a carriage locking mechanism, and a thickness adjustment device.
As illustrated, the machine base
10
has a top surface, opposed left and right mounting sides
101
spaced apart from each other in a longitudinal direction, and opposed feed-in and take-out sides disposed apart from each other in a transverse direction.
The left and right pairs of posts
13
are fixed on the top surface of the machine base
10
at the left and right mounting sides
101
, respectively.
The cutter carriage
12
is disposed above the machine base
10
, and has opposite end portions mounted respectively, vertically and movably on the left and right pairs of posts
13
.
The left and right threaded rods
16
(only the latter is visible in
FIG. 2
) are mounted respectively and rotatably on the left and right mounting sides
101
of the machine base
10
such that the threaded rods
16
are disposed respectively between the left and right pairs of posts
13
, and extend threadedly through the end portions of the cutter carriage
12
for moving the cutter carriage
12
along the posts
13
when the threaded rods
16
rotate on the machine base
10
, thereby adjusting height of the cutter carriage
12
.
The cutter unit (not visible) is disposed on the cutter carriage
12
in a known manner for cutting a workpiece
100
fed therebelow in the transverse direction.
The carriage locking mechanism locks the cutter carriage
12
at a selected height.
The thickness adjustment device includes a rotary disc
14
rotatably mounted on the machine base
10
at the right mounting side
101
, and formed with three vertical stems
141
of different lengths, and a horizontal shaft-holding arm
150
fixed on the right end portion of the cutter carriage
12
, and a vertical stop shaft
15
fastened threadedly to the shaft-holding arm
150
on the cutter carriage
12
in such a manner that rotation of the rotary disc
14
can result in alignment of a selected one of the vertical stems
141
with the stop shaft
15
, thereby determining a thickness to be removed from the workpiece
100
by the cutter unit
12
.
However, the aforesaid conventional wood planing machine provides restricted thickness adjustment since there are only three vertical stems
141
on the rotary disc
14
, thereby adversely affecting the adjustment range.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a wood planing machine with an improved thickness adjustment device which is clear of the aforementioned drawback.
Accordingly, a wood planing machine of the present invention includes an elongated machine base, left and right pairs of posts, a cutter carriage, vertical left and right threaded rods, a cutter unit, a carriage locking mechanism, and a thickness adjustment device. The machine base has a top surface, opposed left and right mounting sides spaced apart from each other in a longitudinal direction, and opposed feed-in and take-out sides disposed apart from each other in a transverse direction. The left and right pairs of posts are fixed on the top surface of the machine base at the left and right mounting sides, respectively. The cutter carriage is disposed above the machine base, and has opposite end portions mounted respectively, vertically and movably on the posts. The left and right threaded rods are mounted respectively and rotatably on the left and right mounting sides of the machine base such that the threaded rods are disposed respectively between the left and right pairs of posts, and extend threadedly through the end portions of the cutter carriage for moving the cutter carriage along the posts when the threaded rods rotate on the machine base, thereby adjusting height of the cutter carriage. The cutter unit is disposed rotatably on the cutter carriage. The carriage locking mechanism locks the cutter carriage at a selected height relative to the machine base. The thickness adjustment device is mounted on the cutter carriage, and is adapted to adjust thickness to be removed from a workpiece by the cutter unit. The adjustment device includes a pointer-retaining case, a vertical measuring scale, a vertical stop shaft, a horizontal scale pointer, and a biasing spring. The pointer-retaining case is fixed on the cutter carriage, and is formed with a vertical row of positioning groove units. The vertical measuring scale is disposed on the pointer-retaining case. The stop shaft extends rotatably and is mounted vertically and movably on the pointer-retaining case, and has a lower contact end abutting against the machine base. The horizontal scale pointer is disposed within the pointer-retaining case, and is fastened securely to the stop shaft for synchronous movement therewith. The scale pointer has an inner section, an outer section that is directed toward the scale and that is adapted to indicate the thickness to be removed from the workpiece by the cutter unit, and an intermediate section between the inner and outer sections. The biasing spring is associated with the stop shaft, and biases the stop shaft to rotate about a vertical axis in a direction such that the scale pointer engages a selected one of the positioning groove units in the pointer-retaining case so as to arrest vertical movement of the stop shaft on the pointer-retaining case.
REFERENCES:
patent: 2520868 (1950-08-01), Whiting
patent: 2658424 (1953-11-01), Huck
patent: 3067788 (1962-12-01), Eschenburg
patent: 3718168 (1973-02-01), Berends
patent: 5795113 (1998-08-01), Wixey et al.
patent: 5927357 (1999-07-01), Welsh et al.
patent: 5957174 (1999-09-01), Shadeck
patent: 6076573 (2000-06-01), Welsh et al.
patent: 6089287 (2000-07-01), Welsh et al.
patent: 6131628 (2000-10-01), Chiang
Bray W. Donald
P & F Brother Industrial Corporation
Townsend and Townsend / and Crew LLP
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