Saw blade

Details Saw blade Saw blade

1997-09-08

2001-04-24

Rachuba, M. (Department: 3724)

Cutting

Tool or tool with support

Toothed blade or tooth therefor

C083S846000, C083S848000, C083S851000, C083S852000

Reexamination Certificate

active

06220139

ABSTRACT:

TECHNICAL FIELD
The present invention relates to a saw blade such as a band saw blade, a circular saw blade and the like. More particularly, the present invention relates to a saw blade having a straight tooth as a preceding tooth and a suitable number of succeeding teeth which enlarge and open a cutting groove formed by this straight tooth and have left-hand and right-hand set teeth formed in a left-hand and right-hand symmetrical shape by splitting an approximately central portion of each of tooth edge on a tooth line in a thickness direction thereof.
BACKGROUND ART
For example, a saw blade such as a band saw blade, a circular saw blade and the like, as shown in FIGS.
12
(A) and
12
(B), is conventionally known. Tn this saw blade, a straight tooth
101
S, a left-hand set tooth
103
L and a right-hand set tooth
103
R are set to one group. In another conventional example of the saw blade, as shown in FIGS.
13
(A) and
13
(B), a straight tooth
105
S, a left-hand set tooth
107
L, a right-hand set tooth
107
R, a left-hand set tooth
109
L and a right-hand set tooth
109
R are set to one group.
The left-hand set teeth
103
L,
107
L,
109
L and the right-hand set teeth
103
R,
107
R,
109
R in the respective saw blades are independently bent. As shown in
FIG. 14
, when a material W is cut by each of the saw blades, the left-hand set teeth
103
L,
107
L,
109
L and the right-hand set teeth
103
R,
107
R,
109
R prevent an interference of the material W with a body portion
111
in each of the saw blades.
However, since the left-hand set teeth
103
L,
107
L,
109
L and the right-hand set teeth
103
R,
107
R,
109
R in the respective saw blades are independently formed, the material W is cut by each of the saw blades vibrating leftward and rightward when each of the left-band set teeth
103
L,
107
L,
109
L and the right-hand set teeth
103
R,
107
R,
109
R cuts the material W. As shown in
FIGS. 15A
,
15
B and
15
C, a so-called ghost pattern
113
appears in a cutting plane of the material W cut by the cutting operation.
This phenomenon of vibration of each of the saw blades leftward and rightward particularly causes a problem in performing a heavy cutting operation. When a feed speed exceeds a certain limit, a wavy pattern
115
having an amount of waviness “a” occurs in the material W as shown in
FIGS. 16A
,
16
B and
16
C and may lead to a cutting deviation.
The left-hand and right-hand set teeth in each of the saw blades shown in
FIGS. 12A
,
12
B and
FIGS. 13A
,
13
B
3
are shifted forward and backward in an advancing direction of each of the saw blades. Accordingly, the left-hand and right-hand set teeth are vibrated leftward and rightward with respect to this advancing direction so that the ghost pattern
113
occurs. Further, the wavy pattern
115
occurs in cutting operation for increasing a cutting amount. Accordingly, as a countermeasure for preventing each of the saw blades from being vibrated leftward and rightward, it is necessary to arrange such that that the left-hand and right-hand set teeth simultaneously cut the material while opposing to each other in the leftward and rightward direction.
A saw blade as shown in
FIG. 17
is known as a dovetail type saw blade for simultaneously cutting the material leftward and rightward in this same tooth. Namely, in
FIG. 17
, the saw blade is constructed by a preceding tooth
117
and a succeeding tooth
119
having a dovetail shape. The preceding tooth
117
is set to a high tooth and the succeeding tooth
119
is set to a low tooth.
However, as shown in
FIG. 17
, a face d must be finished by polishing work to obtain a side face relief angle &agr;′ so that it takes much time to perform the polishing work. As shown in U.S. Pat. No. 3,576,061, a similar problem is also caused when an angle of inclination of a rake face is formed.
Further, a chain saw as shown in U.S. Pat. No. 3,367,216 is used to process wood, and a tooth edge of the chain saw is insufficient in strength to cut a metal. A saw blade as shown in U.S. Pat. No. 3,651,841 is also used for a wood material and an organic material (cork, rubber, bone and the like.). There is also a case in which this saw blade is used to cut a material. However, in this case, the strength of a tooth edge of the saw blade is also insufficient. In particular, this saw blade is not suitable for heavy cutting.
In a circular saw shown in each of Japanese published Utility Model (KOKOKU) No. 62-28336 and Japanese published Patent (KOKOKU) No. 62-5730, a tooth line is divided at the tooth line center of a tooth edge in its thickness direction and is perpendicular to a side face of a body portion. Chips produced during cutting is stored into gullets. When the chips are melted and attached to the saw, no chip is sufficiently removed from the saw by a chip removing apparatus (such as a wire brush, etc.) so that tooth edge chipping is caused by the melting attachment of the chips. Further, when a tooth edge of a preceding tooth is chipped, and wearing of a succeeding tooth having a groove in a tooth edge center portion progresses so that a cutting amount becomes greater than a depth of the tooth edge center groove of the succeeding tooth, no chip is divided and cutting resistance is increased and a melting attachment strength is also increased so that tooth edges are often chipped.
Further, in Japanese laid-open patent (KOKAI) No. 54-45895 as a prior example, a V-shaped groove is formed in a central portion of a tooth edge in a saw blade so that the tooth edge is divided into left-hand and right-hand portions and their end tip portions are projected from a body portion side face of the saw blade.
In this construction, the divided left-hand and right-hand tooth edge portions are sharpened so that a tooth edge strength is small and no material can be cut at all when the material is a metal.
An object of this invention is to provide a saw blade in which left-hand and right-hand set teeth in a succeeding tooth with respect to a preceding tooth can be bend quickly simultaneously in left-hand and right-hand directions and almost no ghost pattern is caused and no wavy pattern is caused during cutting operation, and a cutting deviation amount during cutting operation is small so that a stabler cutting operation can be performed.
DISCLOSURE OF THE INVENTION
In consideration of the above-mentioned problems, the invention of claim
1
resides in a saw blade comprising a preceding tooth constructed by a straight tooth unset in left-hand and right-hand directions and a succeeding tooth for cutting a cutting groove formed by the preceding tooth to enlarge and open the cutting groove in width, wherein the succeeding tooth has left-hand and right-hand set teeth bent in the left-hand and right-hand directions by splitting an approximately central portion of a tooth edge on a tooth line in its thickness direction, the clearance between end tip insides of the left-hand and right-hand set teeth is smaller than the thickness of the preceding tooth.
In the above construction, when a material is cut by the succeeding tooth, the left-hand and right-hand set teeth formed in the succeeding tooth simultaneously act on the material in the same place so that component forces in the left-hand and right-hand directions are opposed to each other and cancel each other. Thus, vibrations of the saw blade in the left-hand and right-hand directions can be effectively prevented. Therefore, there is almost no ghost pattern tending to be caused during cutting operation, and generation of a wavy pattern tending to be caused at the cutting time can be prevented.
Further, since the clearance between the end tip insides of the left-hand and right-hand set teeth of each succeeding tooth is smaller than the thickness of the preceding tooth, the uncut remaining portion left in a triangular shape between the above left-hand and right-hand set teeth is cut by each preceding tooth, so that a metallic material can be reliably cut.
In the invention of claim
2
, the thickness of portions of the left-hand and right-hand

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