Wood planing machine with a height display unit

Details Wood planing machine with a height display unit Wood planing machine with a height display unit

2003-04-07

2003-12-23

Bray, W. Donald (Department: 3725)

Woodworking

Planer

Adjustable cutter

C144S117100, C144S382000, C144S430000, C144S356000, C250S559290, C409S210000, C409S214000

Reexamination Certificate

active

06666242

ABSTRACT:

CROSS REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwan Application No. 92201413, filed on Jan. 24, 2003.
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 a height display unit for a cutter carriage.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional wood planing machine is shown to include a machine body
10
, left and right pairs of hollow posts
122
, left and right pairs of screw rods
121
, a cutter carriage
13
, and a height display unit
15
.
As illustrated, the machine body
10
has a base
11
. The left and right pairs of screw rods
121
are mounted rotatably on the base
11
of the machine body
10
. The hollow posts
122
are sleeved around the screw rods
121
. The cutter carriage
13
is disposed above the base
11
, and is mounted on the left and right pairs of hollow posts
122
. The cutter carriage
13
threadedly engages left and right pairs of screw rods
123
(not visible) in such a manner that rotation of the screw rods
123
results in movement of the cutter carriage
13
along the hollow posts
122
. The height display unit
15
includes a measuring scale mounted vertically on one of the hollow posts
122
. A turning wheel
14
is fixed to the top end of one of the screw rods
121
to facilitate turning of the screw rods
121
.
The aforesaid conventional wood planing machine is disadvantageous in that it is tiresome and inconvenient to read the scale of the height display unit
15
during the planing operation. In addition, human error in reading the scale of the height display unit
15
is likely to occur.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a wood planing machine with a height display unit, which can overcome the aforementioned disadvantages of the prior art.
Accordingly, a wood planing machine of the present invention includes: a machine body having a base; a plurality of spaced apart screw rods extending uprightly in a longitudinal direction from and mounted rotatably on the base; a cutter carriage mounted movably on the screw rods so that rotation of the screw rods results in movement of the cutter carriage in the longitudinal direction; a detecting unit mounted on the machine body and including a light transmitter and a light receiver that cooperates with the light transmitter to define a gap therebetween and that generates an electrical signal upon receiving light from the light transmitter; an optical encoder wheel fixed to one of the screw rods so as to be co-rotatable therewith, having a peripheral end, and formed with a plurality of angularly spaced apart holes in the peripheral end, the peripheral end of the optical encoder wheel extending into the gap in such a manner that light emitted from the light transmitter is received by the light receiver only through the holes; and a control unit mounted on the machine body and electrically connected to the detecting unit for receiving the electrical signal from the light receiver and for calculating the number of revolutions of said one of the screw rods and the height of the cutter carriage relative to the base during rotation of the screw rods.


REFERENCES:
patent: 6279628 (2001-08-01), Chang
patent: 6308754 (2001-10-01), Chang
patent: 6474378 (2002-11-01), Ryan et al.
patent: 6510879 (2003-01-01), Chuang
patent: 2001/0051492 (2001-12-01), Donahue

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