Cutting – By endless band or chain knife
Reexamination Certificate
2002-11-21
2004-01-20
Goodman, Charles (Department: 3724)
Cutting
By endless band or chain knife
C083S820000, C083S812000
Reexamination Certificate
active
06679148
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese application no. 091209380, filed on Jun. 21, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a belt saw machine, more particularly to a belt saw machine with a rotatable cutter shield that can facilitate replacement of a belt cutter.
2. Description of the Related Art
Referring to
FIGS. 1 and 2
, a conventional belt saw machine
10
is shown to include a machine base
11
adapted to stand on a ground, a support frame unit
12
mounted on the machine base
11
, a drive roller unit
13
mounted in the support frame unit
12
, a belt cutter
14
trained on the drive roller unit
13
, a workpiece positioning unit
15
mounted on the support frame unit
12
and movable vertically, and a cutter shield device
16
mounted on the support frame unit
12
for shielding the belt cutter
14
. The belt saw machine
10
further includes a worktable
111
mounted horizontally on the machine base
11
and disposed in a notch
121
of the support frame unit
12
. The drive roller unit
13
includes a motor
131
mounted fixedly on the support frame unit
12
, a lower drive roller
132
mounted rotatably to the support frame unit
12
and driven by the motor
131
, and an upper drive roller
133
mounted rotatably to the support frame unit
12
. The belt cutter
14
is trained on the upper and lower drive rollers
133
,
132
, and extends through the worktable
111
in the notch
121
. The workpiece positioning unit
15
includes a mounting block
151
secured to the support frame unit
12
, a vertical rack
152
disposed between the mounting block
151
and the support frame unit
12
, a rotatable adjusting rod
153
extending through the mounting block
151
in a direction transverse to the rack
152
, a drive pinion
154
sleeved fixedly on the adjusting rod
153
for driving the rack
152
, and a positioning block
155
mounted fixedly on a lower end of the rack
152
. The cutter shield device
16
includes an angled shield plate
162
that is formed with a plurality of slots
1621
, and a plurality of fasteners
161
that fasten a lower end of the shield plate
162
to the positioning block
155
through the slots
1621
. When the fasteners
161
are tightly screwed, the shield plate
162
will be in a position for shielding the belt cutter
14
. In use, the adjusting rod
153
is rotated to drive the rack
152
for moving the positioning block
155
downwardly until the latter presses a workpiece (not shown) against the worktable
111
for positioning the same. Thereafter, the motor
131
can be activated to drive the belt cutter
14
for cutting the workpiece. The cutter shield device
16
shields the belt cutter
14
for work safety. In practice, the conventional belt saw machine
10
suffers from the following drawbacks:
When replacing the belt cutter
14
, since the shield plate
162
shields the belt cutter
14
, the shield plate
162
must be dismantled, which requires unscrewing of the fasteners
161
. Moreover, after replacing the belt cutter
14
, the shield plate
162
has to be mounted once again on the positioning block
155
by tightly screwing the fasteners
161
through the slots
1621
. Therefore, quick replacement of the belt cutter
14
is not possible in the conventional belt saw machine
10
.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a belt saw machine with a rotatable cutter shield that can facilitate replacement of a belt cutter.
Accordingly, a belt saw machine of this invention comprises:
a machine base adapted to stand on a ground;
a support frame unit including a fixed cover mounted fixedly on the machine base, and a rotatable cover connected pivotally to the fixed cover and rotatable between a covering position and an open position;
a worktable mounted horizontally on the machine base and adapted to support the workpiece thereon;
a cutter unit including an upper drive roller mounted rotatably to the fixed cover, a lower drive roller mounted rotatably to an assembly of the machine base and the fixed cover, a motor mounted on the assembly of the machine base and the fixed cover for driving the lower drive roller, and an endless belt cutter trained on the upper and lower drive rollers and having a portion that extends through a space which is defined between the fixed cover and the rotatable cover when the rotatable cover is disposed at the covering position;
a workpiece positioning unit mounted on the fixed cover and disposed above the worktable, the workpiece positioning unit including a positioning block that is connected vertically and movably to the fixed cover and that is movable downwardly relative to the worktable so as to be adapted to press the workpiece against the worktable; and
a cutter shield device including
a vertical shield shaft having a lower end fixed on the positioning block, and
a shield assembly mounted on the shield shaft and pivotable thereabout, the shield assembly including an angled shield plate and a sleeve connected fixedly to the shield plate and sleeved rotatably on the shield shaft, the shield plate being confined between the fixed cover and the rotatable cover and having a lower portion projecting downwardly from the fixed cover and the rotatable cover for covering the belt cutter when the rotatable cover is disposed at the covering position, the shield plate being rotatable to a non-shielding position when the rotatable cover is disposed at the open position, thereby permitting replacement of the belt cutter.
REFERENCES:
patent: 4321849 (1982-03-01), Athey et al.
patent: 4920846 (1990-05-01), Duginske et al.
patent: 5041056 (1991-08-01), Hutton
patent: 6240825 (2001-06-01), Xie
patent: 6457395 (2002-10-01), Wiand et al.
Goodman Charles
Trop Pruner & Hu P.C.
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