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Патент USA US2404707

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July 23, 1946.
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T, HASEGAWA
2,404,707
METAL SAWING MACHINE
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Filed Aug. V14, 1940
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6 Sheets-Sheet ‘1
3i 48 37'
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“My 239 39%‘
T. HASEGAWA
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ZAMWW
METAL SAWING MACHINE
Filed‘ Aug. 14, 1940
6 Sheets-Sheet 2
July 23, 1946.
T. HASEGAWA
2,404,707
METAL SAWING MACHINE
Filed Aug. 14, 1940
.mow
6 Sheets-Sheet 5
y 23, 1946.
T. HASEGAWA
2,404,707
METAL SAWING- MACHINE
Filed Aug. 14, 1940
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6 Sheets-Sheet 5
2,404,707,.-.
Patented July 23, 1946
UNITED STATES PATENT OFFICE‘
METAL SAWING MACHINE
Takao Hasegawa, Osaka, Japan; vested in the
Alien Property Custodian
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Application August 14, 1940, Serial No. 352,616
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In Japan August 30, 1939
8 Claims.
1
(Cl. '29—74)
2
.
are provided, lying in the same vertical plane,
is an opening 5 into which the material 4 to be
cut is inserted. E are the bolts holding the ma
chine frames 3, 3 together. ‘I and 8 are respec
and having means which move the saws up and
tively the receiving seat and the clamp which ‘hold
down and having also means which in relation to
the said upward and downward movement draw
the material 4 therebetween in the opening 5, and
on the clamp 8 are provided the oil pressure
the saws toward one another when the saws are
moving downwardly and which move the saws
away from one another when they are moving
cylinder 9 and ram Ill, to operatethe clampt.
My invention relates to improvements in metal
sawing machines in which two vertical bow saws
upwardly, and the objects of the improvements
2-a (Fig. 6) are horizontal guide, grooves at-the
upper part and at both. the front andrear sides,
of the bow-shaped frames 2,2, and2—-b (Figs; 6
and -8) are the vertical guide grooves at one side
of each of the frames 2, 2. “(is the guide block
common to the saws I, I, and'is formed of two
metals with theleast strain on the cut faces of
plates connected to hold the frames, 2, 2‘ there
the metals; and third, to avoid unnecessary force
which would otherwise be exerted in the sawing 15 between, and having projections II-a (Fig. 9)
to correspond with the horizontal grooves 2-11
operation, thereby attaining higher sawing effi
of the frames 2, 2. By means of these projections
ciency, as compared with similar machines here
II-—a, the upward and downwardmovements of
tofore in use.
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. the saws I, I are accomplished, and they serve to
I attain these objects 'by mechanism illustrated
in the accompanying drawings, in which
_ _ .20 guide the rightward and leftward movements of
the saws. I, I. I2 are guide blocks provided for
Fig. 1 is a front elevation of a machine embody
are, ?rst, to construct machines which cut metals
from both sides simultaneously; second, to cut
ing the invention;
,
I
I
the saws I, I I, each having a projection I2-—a‘to
correspond‘ with the vertical groove 2--b (Fig.8)
of the frame .2, and these projections I2—a, ac
Fig. 3 is a vertical section of the machine taken‘
25 complish the rightward and leftward movements
on the line 3-3 of Fig. 1;
of the saws I, I and also serve to guide them:
Fig. 4 is a sectional plan of a part of the ma
ward and downward movements of the saws I, I.
chine taken on the line 4-4 of Fig. 3;
I2—b are the horizontal guide rods secured at
Fig. 5 is an elevation showing connecting pipes
both front and back sides of the guide blocks I2
of oil pressure pumps;
Fig. 6 is an elevation showing the operating 30 and received in the horizontal channels 3—-b .in
guide paths 3—-‘a (Fig. 3) of the machine frames
mechanism, the machine frame and other parts
3, 3 in order not only to retain the guide “blocks
of the machine being omitted;
I2 in their position but also to guide the right
Fig. 7 is a side elevation corresponding to
Fig. 2 is a rear elevation;
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ward and leftward movements of the guide blocks
Fig. 6;
Fig. 8 is an enlarged sectional plan of a part 35 I2. The frames 2, 2 and guide blocks I2, I2 slide
along the guide paths 3—-a of the machine'frames
of the machine taken on the line 8-8 of Fig. 6;
3, 3, whereby they are prevented from rocking.
Fig. 9 is an enlarged section of a part of the
‘ I4 is a horizontal lever, one end IQ-b of which
machine taken on the line 9-9 of Fig, 6;
is connected to the central guide block II through
Figs. 10 and 11 are elevations of the apparatus
shown in Fig. 3 as it appears in the last two op 40 a link I5, while the other end IIl---av is supported
by a bearing I6 (Fig. 1) which is adjustably
mounted to move on the machine frame 3. I4;—c
Fig. 12 is an enlarged section of the oil pres
erations;
sure
regulator;
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Figs. 13, 14 and 15 are diagrammatic illustra
tions showing the operation of the oil pressure
regulator; and
Figs. 16, 1'7 and 18 are diagrammatic illustra
is ‘the supporting pintle by which the end I4-‘-a
is ‘pivoted on the bearing I5, and I4-—d is the pin;
' tle connecting the end I4-b with the link‘ I5.
IE-a is the pintle connecting the link I5 with the
block II.“ One end of this pintle I5—-a, extending
into the vertical guide slot 3——o' (Fig. 1) in the
tions showing the rotation of the operating crank
front'machine frame 3, is connected to the slide
corresponding respectively to Figs. 13, 14 and 15.
Referring to the drawings in detail, I, I (Fig. 50 Il which‘is slidably mounted‘in the‘ guide slot
6) are the two vertically disposed bow saw blades,
and 2, 2 are the bow frames to which the blades
I, I, respectively, are ?xed at both ends. 3, 3
(Fig. land Fig. 2) are the machine frames which
carry the frames 2, 2, and in the center of which 1
.'§—c. ‘so that the block II is allowed only‘vertical
movement. I4—e (Fig. 6) is the guide slot in the
lever I4. A slide I8 which is mounted in this
slot Ill-e is connected to the crank Iii-a of the
rotatable shaft I9 supported in the bearing 20
2,404,707
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(Fig. 3) on the machine frame 3, and driven by
the motor 27 through gears 2!, 22 and 23, pul
leysv 24 and. 25 and belt 26, as shown in Fig. 2.
By rotating shaft 59, the lever [A (Fig. 6) is
moved up and down and consequently imparts
upward and downward motion to both saws I, I,
4
46 can be adjusted sorthat the safety valve 43
controls the force of the oil pressure which oper
ates on the saws I, l. The plate valve 38 carries
'a valve rod 33—a which when pushed from out
side of the valve chamber 3'i'—a moves the valve .
28 (Fig.6) is lianro'ilpressure cylinder mounted
38 from the seat EL-b. The inner end of the
rod 38—a contacts‘ the valve rod 337—a of the
‘valve 39. Until this contact occurs, ‘the valves
on the machine frames 3, 3 in the space above
38 and‘t? are removed ‘from their seats "31-h and
throughlink 1,5.and block II.
I
the block H, and having two pistons 29, 29 10 3'i-—c, respectively. In this condition of the
therein. Each piston 29 has a piston rod 29-11
‘parts, the oil, as shown by the arrows inFig. 14,
connected to the guideblocks l2, respectively,
*?owsrup'from thecylinder 23, through pipe 32.
through links 38 and vertical levers 3! which are
pivoted to the front and back ‘machine vframes
3, 3, on pintles 3l——a. Simultaneously with‘the
start of the descent of both saws _I, II, :pressure
into the valve chamber 3‘l-a and passes to
gether with the high pressure oil coming from
the pump 34 into the oil-tank 36 through pipe
1311, ‘with the consequence that the pressure in
oil is fed through the aperture 28-;a "in ‘:the
middle of the cylinder 23 so as to push the ,pis
tons 29 outwardly, and cause pressure on both.
pipe BiZzfalls so that the pistons 29, 29 are pushed
back by the low pressure oil in the cylinder 28,
and ‘during such time,.the saws i, i move away
saws i, l, causing them to move toward the ma 20 from the material 5. However, if the inner end
terial ‘iwhile-when the saws I, i start to ascend
of1the~valverod38-'-a pushesthe other ‘valve rod
the pressure oil is forced out of the aperture
3-9-11, the spring at: ‘is compressed-and 'thee'v'alve
f28—-aiin the middle of the ~cylinder'28, pressure
oil "being ‘fed into the cylinder 28 through aper
tures 28—'b at the ends of the cylinder 28, to ‘
operate on the pistons 29 from the opposite di
rection'causing the saws l, i to separate, moving
them away from the material 4.
‘The invention also provides means by which
‘the edges of the .saws I, ‘i are 'moved slightly ~
from the cut ‘face-i of they -material 4% when the
saws 1,1 approach the completion of the sawing
‘39 is seated on the seat 3l—-c, and furtherpres
sure compresses the spring 42, as the rod 39—-a
slides through the valve (it. In this condition-of
the parts, shown in Fig. 15, the oil is prevented
from ‘?owing up from the cylinder ‘'28, 'so that the
pistons 28, "Ztdo not move in the cylinder 28, and
the-separating movementl'of ‘the saws i, -l ceases.
The separating movementof the saws l, I begins
when the tappet :28 (Fig. "5) pushes the vend »of
the rod 3¥-—a projecting outside of the 'valve '
~operation, avoiding'violent "shaking of the saws
1|, "I, and at the same time utilizing nearly the
entire length of the saws .I, II, to perform the
chamber ‘Si-a. ‘Thisitappet 541B is actuated by a
‘bell-crank lever 4'9 ‘carrying lroller 49-0, which
cutting operation most‘ efficiently.
Fig.5 shows ithe‘high pressure aperture 28—a
‘Figs. ‘'16, 1-7 and’ 18 are diagrammatic illustra»
tions corresponding to Figs. '13, 14 and '15 and
show the positions into which the cran-kpin 1Hl—'b
'moves. Fig. 16 shows that while the high pres
sure oiloperates to/move the Saws 1, 1 toward one
another to press them against the'material liythe
in the middle. of the cylinder 28 and vthe ‘low
pressure apertures 2-9--_b ‘in the ends of the cylin
der128,-connectedrespectively to ;the high pres
sure pump 3'4 and the low» pressure pump 35,
throu'ghthe' respective pipes 32 and 3-3. - rI‘hese
pumps sliand as are operated by suitable power
transmission "means (not shown) from the shaft
of ‘the pulley, 24.
‘
The low pressurefoil pipes as are constantly
v'co‘n'neoted'with the cylinder 28 so that the low
pressure bill-being fed v:inte the cylinder exerts
pressure ‘on thepistons :29, 29, and the excess oil
escapes into the ‘oil tank 536 through the safety “
valve 3-3-0; and pipe 3'.‘i—*b. The high pressure
oil pipe P32 is not connected ‘directly to the high
pressure pump I34 1but is connected thereto
through 2the ‘regulator 137 and oil pipe 132-40.
‘Referring particularly "to the construction and 4
operation of ‘the oil ‘pressure regulator 31, in vthe
valve ‘chamber Bil-a leading to the high pres
sure oil pipe 232, there are valve seats 31-1),
‘31-1: and plate 'valves 38 ‘and 59. The valve 38
istpressed against the seat w3i—b by spring'll?,
"while'valve?s vis disposed ‘away from seat 3'i—c
vby spring'lii. rThe ‘spring 142 is designed when
expanded not to press against valve'39. In this
condition of ‘the parts, the high pressure oil
‘?owing into-the valve chamber 3l—a from the
high i-pressurepump 34 through pipe 32—a is, as
is moved 'by cam 959021111661 by shaft t9.
crank pin l9—-b moves from the‘upper ‘dead cen
ter point A to the lower dead center'p'oint B, and
during this period the’saws "l, v‘I descend in'their
working stroke. Fig. 117 shows‘that while the low
ipressureioil operates to retract'the'saws L‘! from
the material t, the crank pin 19-?) moves from,
the lower dead center point B to the next point
C,Vand from this ?gure it 1will be seen that the
saws are ;removed vvfrom ‘the ‘material 53, during
a very short portion of the ‘travel of the crank
pin 59-1) and consequent short vertical move»
.ment of the saws =1, 1i . FigHlB shows that while
the saws I, i are held immovable (Fig. 15),“the
crank pin 19;?) moves from the ‘point C‘ to the
upper ‘dead center A, raising the saws i, ‘l, and
vfrom this ?gure it will be seen that'duringthe
ascent of the saws i, i, they are ‘held immovable
horizontally'in‘positions but little removed from
the material 13, so that they need be moved only.
a short distance'to exert pressure on ‘thenext
working stroke.
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Further the invention provides means-by which
when the saws l, 'l have reached the central'part
of the material 4,'they act alternately, after they
have come within certain limits‘of mutual, con
shown aby'the arrows :in Fig. 13, supplied to the
tiguity, so that there shall always ‘be a small space,
oil :pipe 32 and {flowing into ‘the central part of
left between ‘the two 'saws i, It to obviateany pee-1
the cylinder .28 :pushes the pistons 29, 29 out—
sibility of contact with one another. As showniin
:wardly against the pressure of, the ‘low pressure 70 ‘Figs. 10 and I1, eccentric'discs 5| arerprovi'ded ‘
710i] and gives the requisite :pressure to force the
to bear against the upper’ ends of the lovers ‘35;
saws .l,- 1 toward the material ~13, for their cutting
.As
these discs rotate on their shafts fill-4t in I
operation. '43 is a safety valve ‘which excess oil
proper co-ordinated positions when they, are in ~
‘opens to flow out through pipe 4-4 into the oil
the position shown in ‘Fig. 10, the upper end of
tank'36. ( By :rotating the screw lid 45, the spring '75. the "left lever-3i extends outwardlyto-the left and
2,404,707
15
the lever pushes the left saw l to the right, with
out any restraint from‘the‘ left disc 5|, and the
right lever 5| is restrained from moving toward
the right by the right disc 5| so that the right
6
ciprocating means being adapted to so co-a'ct that
the saws are moved into working position against
a said sides, respectively, on each downward stroke,
and have horizontal movement into said mass
saw, I is restrained from moving the full distance Cl for progressive cutting action during the whole of
each downward stroke, are moved horizontally
to the left. Similarly, as shown in Fig. 11, the
out of contact with said mass during a portion
levers 3| operate reversely so that the left
l
of each upward stroke, and are maintained im
is restrained while the right saw is permitted to
mobile horizontally‘dur‘ing the remainder ofeach
move forward the full distance. Thus it will be
seen that by this mechanism the saws l, l are 10 upward stroke.
4. In a sawing machine, the combination of
prevented from contact when they approach the
means to support a mass of material to be sawed;
central part of the material 4.
a pair of saws disposed adjacent opposite sides of
The gearing for these eccentric discs 51 is
said mass, respectively, and adapted to be recip
shown in Figs. 1 and 3. Bevel gears 52 are ?xed
on the shafts 5I-—a of the eccentric discs 5!, re 15 rocated in a vertical plane, and to be reciprocated
in a horizontal plane; means adapted to recipro
spectively, and mesh with bevel gears 53, respec
cate said saws vertically; a single pressure means
tively, secured on the horizontal shaft 5!! which
adapted to press said saws toward each other
is journaled in bearings 55 on the front of the
horizontally and into said mass for progressive
machine frame. This horizontal shaft 54 has a
bevel gear 56 which meshes with the bevel gear 20 cutting action during each downward stroke; andv
means adapted to move said saws horizontally
51 which is ?xed on the vertical shaft 58 jour
away from said mass, during a portion of each
naled in the bearings 55' on the front of the ma
upward stroke, and maintain said saws immobile
chine frame. On the upper end of the vertical
horizontally during the remainder of the upward
shaft 58 there is ?xed the bevel gear 59 which
stroke,
25
meshes with the bevel gear 60 ?xed on ‘the
5. In a sawing machine, the combination of
shaft l9.
means to support a mass of material to be sawed;
What I claim is:
a pair of saws disposed adjacent opposite sides
1. In a sawing machine, the combination of
of said mass, respectively; a vertically recipro
means to support a mass of material to be sawed;
catory frame in which said saws are mounted for
a pair of saws disposed adjacent opposite sides
horizontal reciprocation therein; a pair of hor
of said mass, respectively, and adapted to be re
izontally reciprocable frames in which said saws‘
ciprocated along two paths lying in a plane trans
are respectively mounted for vertical reciproca
verse to the longitudinal axis of the mass, said
tion therein; a hydraulic system, comprising a
paths being at an angle of 90° to one another; 35 high pressure circuit and a low pressure circuit
means adapted to reciprocate said saws along one
adapted to reciprocate said pair of frames to
of said paths; and means adapted to reciprocate
move said saws toward and away from said mass,
said saw-s along the other of said paths, said two
respectively; and means adapted to regulate the
reciprocating means being adapted to so co-act
operation of said system, said regulating means
that the saws are moved toward each other along 40 being operated by the means for reciprocating
one of said paths, to cut progressively deeper into
said mass, on each stroke in one direction along
the other of said paths, are moved along said ?rst
path, away from each other and slightly away
from said mass, at the end of said stroke and
during a portion of the stroke in the opposite
direction along the second path, and are held
against movement along said ?rst path during
the remainder of the last mentioned stroke.
said vertically moving frame.
6. In a sawing machine, the combination of
means to support a mass of material to be sawed;
a pair of saws disposed adjacent opposite sides
of said mass, respectively, and adapted to'be re
ciprocated horizontally and vertically; a hydrau
lic system for reciprocating said saws horizontally,
comprising a low pressure circuit and a high pres
sure circuit, said low pressure circuit exerting
2. In a sawing machine, the combination of 50 constant pressure tending to move said saws away
from said mass, and valve means for controlling
means to support a mass of material to be sawed;
said high pressure circuit; and means for recip
a pair of saws disposed adjacent opposite sides
rocating said saws vertically, said vertically re
of said mass, respectively, and adapted to be re-~
ciprocating means operating said valve means to
ciprocated in a vertical plane, and -to berecip
render
the high pressure circuit operative to move
rocated in a horizontal plane; means adapted to 55
the saws toward the mass during each downward
reciprocate said saws vertically; and pressure
means adapted to reciprocate said saws horizon
tally, said two reciprocating means, being adapted
to so co-act that the saws are pressed toward each
stroke, to render the high-pressure circuit inop_.
erative to permit the low pressure circuit to move
the saws away from said mass at the end of
the downward stroke and a portion of the upward
other and into working position against said sides, 60 stroke, and to render both circuits inoperative
respectively, under constant pressure for pro
to maintain the saws immobile horizontally dur
gressive cutting action on each downward stroke,
ing the remainder of the upward stroke.
moved slightly away from said mass at the end
7. In a sawing machine, the combination of‘
of the downward stroke and during a period of
means to support a mass of material to be sawed;
the upward stroke, and are held against hori 65 a pair of saws disposed adjacent opposite sides
zontal movement during the remainder of the up
of said mass, respectively; a vertically recipro
ward stroke.
catory frame in which said saws are mounted for
3. In a sawing machine, the combination of
horizontal reciprocation therein; a pair of hori
means to support a mass of material to be sawed;
zontally reciprocable frames in which said saws
a pair of saws disposed adjacent opposite sides of
are respectively mounted for vertical reciproca
said mass, respectively, and adapted to be recip
tion therein; means for reciprocating said verti
rocated in a vertical plane, and to be reciprocated
cally reciprocatory frame; means for reciprocat
in a horizontal plane; means adapted to recipro
ing said horizontally reciprocable frames; and
cate said saws vertically; and means adapted to
means for so limiting the reciprocation of said
reciprocate said saws horizontally, said two re- “
horizontally reciprocable frames that the saws
2,404,?07
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‘function alternately as they-reach an area of the
are respectively mounted for vertical reciproca
:mass closely adjacent its longitudinal axis.
tion therein; means for reciprocating said verti
‘8. In a sawing ‘machine, the combination of
cally reciprocatory frame; means for reciprocat
mean'sto support a mass of'material to be sawed;
ing said horizontally reciprocable frames; and
a pai'rof saws disposed adjacent opposite sides 5 means for so limiting the reciprocation of said
of ‘said mass, respectively; ‘a vertically ‘recipro
horizontally reciprocable frames that thersaws
catory frame in which said saws are mounted for
are prevented from‘ contacting vone another as
horizontal reciprocation therein; apair of hori
they reach the longitudinal axis of the mass, ;
zontally'reciprocable frames in which ‘said. saws
TAKAO‘ ‘HASEGAWA. _
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