Note: Descriptions are shown in the official language in which they were submitted.
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FIELD OF THE INVENTION
The present invention relates to a new improved saw blade
suspension device and particularly to the clamping structure
and front end of the upper and lower arms provided with a
washer. The main purpose of the present invention is to
provide properties of stability, low deformation, low
friction and low noise for the saw, and to have the functions
of economy and improved quality.
The present invention provides a saw-blade suspension device
for a scroll-saw or a fret-saw.
BACKGROUND OF THE INVENTION
Conventional scroll sawing machines have the structure of the
two ends of the saw blade of the fixed type. The two ends
of this kind of structure, in the process of pulling and
sawing,~cannot provide a suitable resilience and the varia-
tion of the applied force on saw blade itself is overdone.
Thus, the saw blade is easily damaged and broken. Convention-
ally, the solution is to ~mprove the quality of the saw blade,
but this increases the cost and it also limits the kind of
the working object. Further, even if improvement is obtained
by this method, it still cannot give a perfect result.
SUMMARY OF THE INVENTION
The present invention uses a non-fixed type of suspension
method and creates a clamping suspension system for a saw
blade. The clamping suspension considers the position of
the applied force and uses a high hardness washer to improve
the deformation of the upper and lower support arms and
friction to complete the design of the present invention.
The present invention is suitable for many kinds of saw
blades, and naturally, the limitation for the processed
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material is small, and the damage to the saw blade can be
minimized.
Accordingly, the present invention provides a non-fixed saw
blade suspension device for use in association with a
mechanical saw having two support arms for an elongate
blade comprising a clamping body attachable to each end of
an elongate saw blade, said body defining a clamping gap for
receiving an end of a saw blade; means coacting with the
clamping body for reducing the spacing of the clamping gap
so as to clamp the saw blade end to the body; a rounded
steel bearing positioned on the clamping body for receiving
the force of a support arm for the saw; and a washer of high
hardness steel provided on each support arm for engaging the
rounded steel bearing on each clamping body.
BRIEF DESCRIPTION OF THE_DRAWINGS
Fig. 1 is a front elevational view of the main body of the
clamping structure.
Fig. 2 is a bottom elevational view of the main body of the
clamping structure.
Fig. 3 is a side elevational view of the main body of -the
clamping structure.
Fig. 4 is a sectional view along line 4-4 in Fig. 1.
Fig. 5 is a perspective view of the clamping structure and
saw blade in combination.
Fig. 6 is a top elevational view of the washer.
FigO 7 is a sectional view along line 7-7 in Fig. 6.
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Fig. 8 is a perspective view of the upper support arm.
Fig. ~ is a vertical sectional view of the clamping structure,
washer, upper support arm and saw blade in combination.
Fig. 10 is a cross sectional view of the clamping structure,
washer, upper support arm and saw blade in combination.
GENERAL DESCRIPTION OF THE PREFERRED EMBODIMENT
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Structure of the present invention comprises a clamping
structure 1, a washer 2, upper and lower support arms 3 and
a saw blade 4.
As shown in Figs. 1-4, the clamping structure includes a main
body 11. In the middle of main body 11, there is a clamping
gap 12 and a round hole 13 allowing the clamping gap 12 to
possess better deformation ability for clamping saw blades 4
with different thicknesses. At the side of the main body 11,
there is a screw hole 14. At the front section of said screw
hole 14, there is no thread, that is, the front section is a
smooth round hole 15. When the screw 5 (please refer to Figs.
5 and 9) penetrates through the round hole 15 to the threaded
screw hole 14, the match of the screw 5 and screw hole 14
causes the clamping gap 12 to lessen, and allows the saw
blade 4 placed in the gap 12 to be tightly clamped. At the
lower part of each side of the main body 11, there is a
retaining seat 16 and 17. The retaining seats 16, 17, are
each provided with a hole 18, 19 located directly across from
one another. The two holes 18, 19 respectively are provided
with a steel wire 6 which penetrates therethrough, and the
wire 6 extends against the lower part of the main body 11.
The lower part of main body 11 has a wedge shape for accommo-
dating the wires 6. Due to the pull of saw blade 4, the main
body 11 is pulled downward, and the downward force of the
main body 11 is concentrated on the steel wire 6.
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The reason for using the steel wire 6 is because the
material of the main body 11 and the upper and lower support
arms 3 are of a soft material such as ordinary steel or
aluminum alloy made by casting, and thus, are easily deformed.
As shown in Fig. 5, the two clamping structures are mutually
opposed, and the middle part of saw blade 4 is positioned
between the steel wires 6, 6 and steel wires 6', 6'. If
the two main bodies 11, 11' are slightly deflected, the
supporting force of the circular steel wires 6, 6' serve to
maintain alignment of the blade 4. Thus, the mutually
corresponding sets of steel wires 6, 6', allows the support-
ing force of saw blade 4 to be kept in a stable position.
A specially assembled washer 2 with greater hardness is
placed between the steel wire 6 and the support arm 3 for
keeping the support arm 3 undamaged and undeformed, as shown
in Figs. 6 and 7. The constitution of the washer 2 comprises
a slot 21 for the saw blade 4 to pass through, and a hole 22
for a screw 7 to lock the washer 2 on the support arm 3. A
slot 23 is provided which is slightly larger than diameter
of steel wires 6, 6'.
Fig. 8 is a perspective view of front end of the support arm
3~ The support arm 3 is conventional, and there are two
symmetrical arm bodies. At the front end of the support arm
3, there is a slot 31 for receiving the slot 23 portion of
the washer 2. At the front end of support arm, there is a
slot 32 for the saw blade 4 to pass through. At the proper
position of the support arm 3, there is a screw hole 33 for
a screw 7 to lock the washer 2 onto the support arm 3, that
is, the washer 2 is tightly placed at the front end of the
support arm 3 in order to absorb the force transmitted from
steel wires 6, 6'.
The position of the saw blade 4 is between two sections of
steel wires 6, 6 and 6', 6', and in the middle of the slot
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23 in the washer 2 and the slot 31 of the support arm 3.
Therefore, the saw blade 4 is stable in the pulling and
sawing process, and because the suspension system of saw
blade 4 is of the non-fixed type, the force which is applied
to the saw blade 4 can be released~
~igs. 9 and 10 show the condition of the mutual relationship
of the whole device. It is helpful to understand the
present invention, as shown in these two figures. The
condition of each constitutive element accepting the force
can be seen, and the really mutual conflicting position is
the steel wire 6 having greater hardness and the washer 2.
The design of th~ hardness relation of the materials for use
in this kind of product is novel.
Summing up, the present invention keeps the supporting force
in alignment by use of round high hardness steel wire (i.eO
using high carbon heated bearing steel). The contact position
of the steel wire and the washer, which can be of carbonate
treated steel plate, and the force being applied on the whole
body of the present invention can obtain a better result
for the tool.
