Scroll saw capable of sawing angle adjustment

Details Scroll saw capable of sawing angle adjustment Scroll saw capable of sawing angle adjustment

2002-07-09

2004-05-04

Choi, Stephen (Department: 3724)

Cutting

By tool reciprocable along elongated edge

With work-support and means to vary relationship between...

C083S581000

Reexamination Certificate

active

06729221

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority of Taiwanese application no. 091206938, filed on May 15, 2002.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a scroll saw, more particularly to a scroll saw capable of sawing angle adjustment.
2. Description of the Related Art
Referring to
FIGS. 1
,
2
and
3
, a conventional scroll saw
10
is shown to include a work platform
11
, a hollow C-shaped frame
12
, a work table
17
, a blade unit
166
, a blade holder unit
14
, a motor unit
13
, a transmission unit
15
, and a sawing angle adjusting unit
18
.
The work platform
11
extends in a longitudinal direction, and has a first end
111
and a second end
112
opposite to the first end
111
in the longitudinal direction. A table support block
113
extends uprightly from the second end
112
, and is formed with a pivot hole
114
.
The C-shaped frame
12
has an upper frame portion
122
, and a lower frame portion
123
mounted fixedly on the work platform
11
. The lower frame portion
123
is formed with a pivot hole
121
that is aligned with the pivot hole
114
in the table support block
113
.
The work table
17
is disposed on top of the work platform
11
, and is formed with a blade slot
171
and a pivot pin
172
inserted into the pivot hole
121
.
The blade unit
166
passes through the blade slot
171
in the work table
17
, and has upper and lower blade ends.
The blade holder unit
14
includes upper and lower blade holder arms respectively extending above and below the work table
17
, and connected to a respective one of the upper and lower blade ends and to a respective one of the upper and lower frame portions
122
,
123
of the C-shaped frame
12
.
The motor unit
13
is mounted in the C-shaped frame
12
. The transmission unit
15
interconnects the motor unit
13
and the blade holder unit
14
to drive the blade holder unit
14
for moving the blade unit
166
to reciprocate relative to the work table
17
to cut a work piece (not shown) on the work table
17
.
The sawing angle adjusting unit
18
includes a sawing angle adjusting plate
181
that is mounted on the bottom side of the work table
17
. The adjusting plate
181
is formed with a curved slot
1811
, angle indica adjacent to the curved slot
1811
, and a pivot pin
182
inserted into the pivot hole
114
in the table support block
113
. The adjusting unit
18
further includes a threaded fastener
183
extending through the curved slot
1811
and threadedly engaging the table support block
113
.
Referring further to
FIG. 4
, if the work piece is to be cut at an angle, the angle formed between the blade
166
and the work table
17
must be adjusted. To this end, the fastener
183
is first operated to loosen the work table
17
from the work platform
11
. A force is then exerted on the work table
17
so as to pivot both the work table
17
and the sawing angle adjusting plate
181
about the pivot pins
172
,
182
. Upon adjustment to the desired angle, the fastener
183
is once again operated to clamp the adjusting plate
181
against the table support block
113
.
The following are some of the drawbacks of the conventional scroll saw
10
:
1. Since the sawing angle adjusting unit
18
is located under the work table
17
, sawing angle adjustment and reading of the angle indica are inconvenient to conduct.
2. Because the work piece tilts with the work table
17
, it is not easy to control the position of the work piece during the sawing operation, thereby resulting in poor work quality and efficiency.
SUMMARY OF THE INVENTION
Therefore, the main object of the present invention is to provide a scroll saw that can overcome the aforesaid drawbacks of the prior art.
Accordingly, the scroll saw of the present invention includes:
a work platform having a top side extending and defining a center line in a longitudinal direction and formed with a blade slot transverse to the longitudinal direction;
a C-shaped frame having upper and lower frame portions disposed above and below the top side of the work platform, respectively;
a blade unit passing through the blade slot in the work platform and having upper and lower blade ends;
a blade holder unit including upper and lower blade holder arms respectively extending above and below the top side of the work platform, and connected to a respective one of the upper and lower blade ends and to a respective one of the upper and lower frame portions;
a motor unit mounted on the work platform;
a transmission unit interconnecting the motor unit and the blade holder unit to drive the blade holder unit for moving the blade unit to reciprocate relative to the work platform;
a pivot unit for mounting pivotally the C-shaped frame on the work platform about a pivot axis parallel to the center line, thereby permitting sawing angle adjustment; and
a locking unit for locking releasable the C-shaped frame to the work platform so as to arrest pivoting movement of the C-shaped frame relative to the work platform, thereby permitting retention of the C-shaped frame at a desired sawing angle.


REFERENCES:
patent: 76730 (1868-04-01), Demming
patent: 2780249 (1957-02-01), Andreae et al.
patent: 5228376 (1993-07-01), Huang
patent: 5327807 (1994-07-01), Chang
patent: 5351591 (1994-10-01), Miyamoto et al.
patent: 5540130 (1996-07-01), Huang et al.

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