Cutting – By tool reciprocable along elongated edge – With means to support tool at opposite ends
Reexamination Certificate
2000-10-13
2002-11-05
Goodman, Charles (Department: 3724)
Cutting
By tool reciprocable along elongated edge
With means to support tool at opposite ends
C083S781000, C083S628000, C083S630000, C083S632000, C083S699210
Reexamination Certificate
active
06474211
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a scroll saw, more particularly to a saw-blade driving device for a scroll saw.
2. Description of the Related Art Referring to
FIGS. 1 and 2
, a conventional scroll saw is shown to include an elongated machine base
10
, a table
11
, a C-shaped blade-holding arm
12
, a generally vertical saw blade
15
, and a saw-blade driving device.
As illustrated, the table
11
is mounted pivotally on the machine base
10
, and is adapted for placement of a workpiece to be sawn such that the table
11
is rotatable about a horizontal axis that extends in a longitudinal direction of the machine base
10
.
The blade-holding arm
12
is fixed on the machine base
10
, and has upper and lower arm portions
121
,
122
that extend in the longitudinal direction of the machine base
10
. The saw blade
15
is held between front ends of the upper and lower arm portions
121
,
122
of the blade-holding arm
12
via two chucks
14
, and extends perpendicularly through the table
11
. The saw-blade driving device includes a motor
16
, and a linkage consisting of an upper swing arm
13
, a lower swing arm
13
″, a generally vertical driving rod
18
, a counterweight plate
17
, and a crankpin
162
. The motor
16
is disposed in the machine base
10
below the table
11
, and has a motor shaft
160
which extends in a transverse direction of the machine base
10
. The motor shaft
160
is shaped as a crankshaft, and is provided with the crankpin
162
. The counterweight plate
17
is sleeved fixedly on the motor shaft
160
. The upper and lower swing arms
13
,
13
″ extend in the longitudinal direction of the machine base
10
, and have middle portions that are disposed pivotally and respectively on the upper and lower arm portions
121
,
122
of the blade-holding arm
12
so that the upper and lower swing arms
13
,
13
″ respectively rotate about two horizontal axes which extend in the transverse Direction of the machine base
10
, front ends provided with the chucks
14
for holding upper and lower ends of the saw blade
15
, and two rear ends connected pivotally to each other by means of a vertical link (not visible) for synchronous movement. The driving rod
18
has an upper end connected pivotally to the lower swing arm
13
″ adjacent to the front end thereof, and a lower end connected pivotally to the crankpin
162
. Under this condition, rotation of the motor shaft
160
results in reciprocal and vertical movement of the driving rod
18
relative to the machine base
10
and consequently reciprocates the saw blade
15
on the blade-holding arm
12
.
One disadvantage that results from the use of the aforesaid conventional scroll saw resides in that in order to form bevel surfaces on the workpiece (not shown) during the sawing operation, the table
11
is tilted. Collision between the table
11
and the motor
16
is thus possible since the motor
16
extends from the machine base
10
in the transverse direction, thereby adversely affecting the sawing operation.
SUMMARY OF THE INVENTION
Therefore, the object of this invention is to provide a scroll saw which is clear of the aforementioned drawback that results from the use of the conventional scroll saw.
Accordingly, the scroll saw of the present invention includes an elongated machine base, a table, a C-shaped blade-holding arm, a generally vertical saw blade, and a saw-blade driving device. The table is mounted pivotally on the machine base, and is adapted for placement of a workpiece to be sawn, and is rotatable about a horizontal axis that extends in a longitudinal direction of the machine base. The C-shaped blade-holding arm is fixed on the machine base, and has upper and lower arm portions that extend in the longitudinal direction of the machine base and that have front ends. The saw blade is held between the front ends of the upper and lower arm portions of the blade-holding arm, and extends perpendicularly through the table. The saw-blade driving device includes a motor and a linkage. The motor is disposed within the machine base, and is provided with a motor shaft that extends in the longitudinal direction of the machine base. The linkage interconnects the motor shaft and the saw blade so as to reciprocate the saw blade relative to the blade-holding arm.
REFERENCES:
patent: 267449 (1882-11-01), Nixon
patent: 1623673 (1927-04-01), Grose
patent: 1826983 (1931-10-01), Beebe
patent: 2327239 (1943-08-01), Bartlett
patent: 2646089 (1953-07-01), Gaskell
patent: 3631751 (1972-01-01), Stumpf
patent: 3863342 (1975-02-01), Griffies et al.
patent: 4825741 (1989-05-01), Wellington et al.
patent: 4841823 (1989-06-01), Brundage
patent: 5228376 (1993-07-01), Huang
patent: 5390577 (1995-02-01), Huang
patent: 5410933 (1995-05-01), Miyamoto et al.
patent: 5778752 (1998-07-01), Chen
patent: 5992283 (1999-11-01), Chen
patent: 6067886 (2000-05-01), Irwin
patent: 6234056 (2001-05-01), Oslick
Goodman Charles
P & F Brother Industrial Corporation
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