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Патент USA US2412311

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Dec. 10, 1946.
2,412,311
A. ZlSKA
‘
METAL SAWING MACHINE
Filed Aug. 6, 1943
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Dec. 10, 1946.
2,412,311
A. ZISKA
I METAL SAWING MACHINE
Filed Aug. 6; 1943
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A. ZISKA
METAL SAWING MACHINE
Filed. Aug. 6, 1945
2,412,311 _
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Dec. 10, 1946.
2,412,311
A. ZISKA
METAL SAWING MACHINE
Filed Aug. 6, 1945
'7 Sheets-Sheet 4
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INVENTOR.
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HTTOE/VE?
' Dec. 10, 1946.
2,412,311
A. ZISKA
METAL SAWING MACHINE
Filed Aug. 6', 1945
‘
7 Sheets-Sheet 5
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BY
Dec. 10, 1946.
I
,1“ zlsKA
‘
METAL SAWING MACHINE
Filed Aug. 6, 1943
2,412,311
'
.
7 Sheets-Sheét 6
IN VENTOR.
?D?/V Z[15%A
BY
\lo ATTORNEY
Dec. 10, 1946.
-
A. ZISKA
METAL
.
2,412,311.
SAWING'v MACHINE
'
» Filed 'Aug. 6, 1943
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HTTOENEK
Patented Dec. 10, 1946
I‘ 2,412,311
UNITED STATES PATE NT
2,412,311
OFFICE ‘
»
METAL SAWING MACHINE
Adam Ziska, Wauwatosa, Wis., assignor to Peer
less Machine Company, Racine, Wis., a corpo
ration of Wisconsin
. Application August 6, 1943, VSe'rialvNo. 497,568
23‘ Claims.
(Cl. 29-73)
1
the motor and pump which provide the ?uid pres
' This, invention relates to improvements in
power-operated metal hack saw machines which
sure medium for actuating themotor;
while capable of embodiment, with singular ad
vantages, in the duplex type of metal sawing ma
chine, also incorporates in its construction various
Figure 3 is a View in endelevation of the metal
hack saw machine illustrated in Figures 1 and. ‘2;
Figure 4 is a fragmentary View in top plan of
the metal hack saw machine illustrated in Figures
‘
novel features susceptible of advantageous use in
metal sawing machines where only a single saw is
lto 3;
'
‘
,
‘
_
used.
Figure 5 is a View partly in top plan and partly
One of the objects of the invention is to con
in, transverse, horizontal cross" section, illustrat
stitute and organize a machine of this character 10 ing the‘ structure of onejof the feed frames and
that is strong, rugged, and durable in construc
of its associated saw frame, a view being taken on
tion, e?icient and rapid in operation, and so con
line 5'—-5 of Figure 6;
__
l
.
trolled in its action that each sawing cycle is
Figure 6 is a fragmentary View,‘ partly in side
largely automatically governed although provision
elevation and partly in longitudinal, vertical cross
is made for manual control at all times.
15 section, taken on line G—6 of Figure 5;
Another object of the invention is ‘to so con
‘Figure 'Tis a View in vertical, transverse cross
stitute a machine of this character and having
section taken on line 'l-—'l of Figure 8; ‘ , ,
’
the advantages mentioned in that it provides’ a
Figure 8 is a fragmentaryv view partly‘in top
unitary, self-contained construction in which the
plan and partly in longitudinal, horizontal cross
fluid'pressure motors that reciprocate the feed 20 section, illustrating the slip clutches employed
and saw frames are completely enclosed and yet
to protect the tensioning means for the saw blade
are closely and compactly as well as effectively
‘and the backing plate and also the eccentric gear
organized with the parts‘with which they are in
utilized to control the operative relationship be
terconnected. The pumps which supply the ?uid
tween the'backing plate and the saw blade;
under pressure to the. ?uid pressure motors are
Figure 9 is a detail View in side elevation show
also housed and carried by the feed frame, and the
ing the structure of the eccentric gear employed to
electric motor which drives both pumps is carried
control the operative relationship between the
by the feed frame though disposed exteriorly
backing plate and the saw blade;
-
thereof. The necessity of resorting to ?exible or
telescopic connections between the pumps and
takenon line Ill-4i! of Figure 8, with parts shown
the ?uid pressure motors is avoided.
in elevation for the sake of illustration;
Figure 10 is a view in vertical cross section,
,
Another object of the invention is to provide an
improved feed and saw frame construction and or‘;
ganization operable to advantage for single sawing
or for’ duplex sawing when two sets of saw and feed
frames are ope'ratively interrelated.
‘
-
_ t
Figure 11 is afragmentary view on an enlarged
scale, and in side elevation, tobetter illustrate the
manner in which the saw blade and the backing
- plate are combined with the saw frame and con
trolled as to position and tension;
v
"
A further object of the invention is to provide
novel and advantageous means fortensioning the
saw and its backing plate and for controlling the
Figure 12 is a fragmentary View partly in side
elevation and partly in cross section and diagram
matically illustrating the valves which take part
irliterengagement between the saw and its backing 40 in the control of the sawing and return strokes of
p ate.
'
' "
the saw frame andthe feeding and withdrawal
Other objects and advantages reside in certain
strokes of the feed frame, and also illustrating
novel features of the construction, arrangement,
the cams and the trip ?ngers combined with the
and combination of parts, which will be herein
saw frame and valves and employed for the pur- I
after more fully described and particularly pointed
‘ pose of automatically operating the valves;
out‘in the appended claims, reference being had
Figure 13 is a view taken on line l3-—l3 of
to the accompanying drawings forming a part of
this speci?cation, and in which:
Figure 12vand further illustrating the cams and
>
Figure l is a view in side elevation illustrating
a duplex metal hack saw machine embodying the 50
present invention;
-
Figure 2 is a fragmentary view partly in side
elevation but mainly in longitudinal, vertical cross
,
trip ?ngers shown in Figure 12;
I
Figure 14 is a detail‘ View in side elevation of
one of the feed frames;
z
‘
V Figure 15 is a view in vertical cross section
taken on lines l5-—l5 of Figure‘ 14;
'
Figure 16 is a detail viewg‘in top plan of one _
section, illustrating the ?uid pressure motor em
ployed to reciprocate each feed frame and also 55 of the saw ‘frames;
2,412,311
3
suitably house the motor-driven pump which sup-v
Figure 17 is a detail view- in side elevation of '
5 one of the saw frames;
.
plies the ?uid under pressure to said motor.
As illustrated in Figures‘ 2, 14, 15, and 21 the
.
Figure 18 is a detail view in diametrical cross 1
section showing the valve mechanism employed to ‘
central portion of the bottom wall of the base ,5 1
regulate the extent of withdrawal of the saw
blades on each return stroke and also the relief
is provided with a raised, portion 8 formed with
downwardly opening recess which overlies an
valve mechanism;
elongated longitudinal slot 9 providedin each
I
Figure 19 is a diagram of the electricalicircu-it
undercut guide rail 1 and sasimilar and register
that may be employed to take its part. in ‘the ' ‘ing elongated slot l?'provided‘in-the top wall of
control of the operating cycles of the machine; 10 the base A under each slot 9.
Figure 20 is a diagram of .the hydraulic circuits :v 1
employed to control various phases ofvthe oper
ating cycles of the machine; and
Figure 21 is a detail view in top plan-of, one
of the tracks or ways provided on the 'base for
cooperation with a feed frame.
' The fluid pressure motor, which drives each
feed frame, has its cylinder ,H disposed in the
recess ‘8 and slots 9 and IE3. Each cylinder H
.15
I issecurely ?xed to the wall of the raised portion
~8_, and oonsequently'is ?xed to and moves with its
feed>frame.1 I A piston I2 is slidably ?tted in each
Referring to the drawings, and more particu
cylinder and ,has a piston rod [3 projecting
larly to Figures 1, 3, and 4,-it will be seen‘ that '
the duplex metal hack saw machine embodying,"v
the present invention generally comprises a base
‘through a stuillng box [4 provided at one end of
eachcylinder ll. The outer end of each piston
rod I3 is anchored to its associated‘ guide rail I,
and consequently to the base A. > For thispur¢
‘ A which may be a metal casting supported on
the base ,A, for sliding horizontal .movementwith
pose,1each guide rail 1 is.p11r.ovidedwitha vertical
hole 15 therethrough and .disposed‘ad-J'acent :to
respect theretopare a pair of similar feed frames, ,
though spaced from one end of the ;slot 9 thereof.
a suitable foundation._ Fitted to guiding ways in
designated generally .at F1 and F2. 'Thes'e'feed f
The portion 2 of each guide‘ raili, located .be
frames F1, F2 are vof identical construction, but
are oppositely disposed. Combined ’with each
tween its hole i 5 and theadjacent .end- ofgitsslot
9, is formed with. a lengthwise hole 2' whose axis
is ‘coincident with the longitudinal axis of the
guide rail I... The outer end of each piston rod
feed frame is a vertically-reciprocal saw frame
, S. .Mounted on each saw. frame S, and tensioned ,
and positioned .in a manner to. be hereinafter ‘1
I 3 is reduced and shouldered and inter?tted with r
‘ more fully described, is a saw blade B and back- 1
the hole?’ of, portion 2' .of its rail 1. 1A inut t5",
threaded on the extreme outerendof each piston
rod 1 3, coacts with-the portionZ to. fix seachoiston ‘
ing plate P. Supported on the base on the oppo
site sides of the feedframes are the work tables,
W1 designating the ‘front, work table. equipped
rod to 'itsfguide rail 1|’.
with suitable gauges 1G, and W2 designating. the
rear work, table, which is ‘slotted and equipped
with suitable ?xtures to maintain the work in
The ?uid pressure medium, which is alternately
supplied to the opposite ends of the cylinder :9, is
position for sawing. The confronting edges of
suitable type and which is mounted on a sup- ,
,
.
'
1.
1
derived from a pump 16, which may be of;»-any
the work tables are suitably spaced to provide 1
porting bracket 16' fixed to one end of the base 15
clearance for the saw blade. B and backing 40 of the feed frame. To 1thesame end wall oft-he.
plate P.
_
I
. The base A is of hollow construction, and. its
base 5 of each feed frame is secured-an electric?
motor H, which, howevenis disposedon the opp0~.
main longitudinal portion, on which the feed
side side of such end wall from the bracket [6
frames F1- and F2 are mounted, is provided with
parallel, undercut, longitudinal ways, designated
and is located outside of the-con?nes of the feed
framealthough entirelysupported thereon and
at l. - These ways, which are of bar- or rail-like
moving therewith.
form, are of similar construction and are shown ‘
‘ in end elevation in Figure 3 and indetail-in Fig
ure 21.. They are securely ?xed to; the horizon
tal top portion'of the base by means of counter; ’
sunk screws, ‘bolts,’ or ‘other fastening devices, and
they are designed-and proportioned to slidably
inter?t with similarly formed guide grooves 13
1 machined on the undersides or bottoms of the
,
.
a
1
j 1
;
The armature shaft 1810f the-motor 11-7 is ‘suite
ably coupled to the rotor of the pump 15 and
serves: to drivethe rotor of the :pump-andinci
dentally to build up suitablepressure that is
required to actuate the piston. l2 of the ?uidzpres
sure motor which serves M its :feed frame.
The
construction described-is adVan-tageousin ‘that
the means which is employed .toireciprocate‘the
feed frames F1 and F2 (see Figures 3 and 15).
Suitable gibs 4 are combined with this intercon
necting and guiding structure to take up wear
feed frame is of the self~contained ‘typeia-nd is ,
and provide for adjustment.
connections is, avoided.
.
1 7
As indicated, the feed frames F1 and F2 are of
identical construction although oppositely -ar—
ranged. They are shown in detail in Figures 14
and 15. Each feed frame is generally of rec
1 tangular construction and includes a hollowhori
‘ Zonta‘l ‘base section 5 and hollow .and vertically
disposed. uprights or standards 6, which have
their lower ends integral with the outer ends of
1 the base section 5; and-are disposed’ parallel to
The upper ends of? the uprights or
1 each other.
directly connected thereto and carried thereby‘.
Any necessity of resorting to ?exible or telescopic
'
'
'
‘
Each saw frame S is of square constructiongas ~
illustrated to advantage in Figures 1, 6, and Y17;
Each such saw frame is made up of upper and
lowercross members, designated at 2'5 and -‘2$,"in
" terconnected at their ends ‘with vertical side memi
bers 21 and 28, these parts rbeing'combined into
one unitary vstructure-by welding or by other ap
propriate means of. securing "them together.
Welding, however, is preferred.‘
'
The‘base section 15 of each feed frame is di
mensioned and proportioned and otherwise de
signed to support and house the ?uid pressure
The side members 27 and 23 of thesaw frame
have their outer portions of V shape in horizontal
cross-section to. provide slides 29 and33? which
slidably inter?t with correspondingly; formed
guide grooves ti and 32 (see Fig-.~ 5) formedin
guide rails 33 and '34, ‘bolted or otherwise suitably
?xed to the confronting or inner walls offthe ver
motor which drives the frame, andrto support ‘and
tically disposed uprights or standards
standards 8 are crossrconnectediby an upper cross
member 1 which is also ‘of hollow, box-like con
struction.
1
"
'
'
'
of the _ .
2,417,231 1.
5
feed frame (see especially Figures 5, 6, 16, and
17).. . The center line of the slide 29 is offset from
the center line of the slide 30 on each saw frame
to permit the two saws to operate in the same
sawing planewhile minimizing the moment arm
between the application of the sawing force to
6
cross member ‘of its saw frame and is securely
fastenediin position in‘this groove by counter
sunk stud bolts 6|. Each lower plate anchor has
integrally formed therewith .an outwardly/pro
jecting and downwardly acting hook'orjgrab. 62',
the bill or active portion of which is undercut.
The ends of the backing. plate P are of thickened
thesaw and its absorption by the saw frame.
construction as they. are reinforced by reinforcing
This is accomplished as shown in Figures 5 and
plates vwelded thereto andin effect integral theree
16 by making the upper cross member 26 of each
saw frame of the offset construction illustrated 10 with. frThe design 'issuch that the ends-of the
backing plate are of‘ the same'thick-ness as the
and correspondingly forming each lower. cross
saw' grips. A slot 64 is formedin :the lower end
member 25.
of the backing plate and has its lower wall 63
, Each saw blade B is anchored at its lower end
angledor slanted toeffectively engage andfco
to the lower cross member 25 of its saw frame
operate with the undercut surface of the'bi'llof
by means of a lower saw grip 35 which comprises
the hook 62, which inithe assembly is received'in
a short rectangular bar provided with a trans
the slot 64. The slot 64 and hook or bill‘ 62 are
verse slot 36 in which the lower end of the saw
so dimensioned and proportioned that while the
blade is ?tted and to which it is secured by dowel
backing plate may not move, vertically with re
pin 38 (see Figures 7 and 11) and in which it is
spect to the hookor bill, it may slide horizontally
clamped by virtue of the action of a clamp Screw
31. Each lower saw grip or anchor 35 is ?tted
in a groove provided therefor in the lower cross
member 25 of its saw frame and is securely held
in position by dowel pin 40 and stud bolt 4|. The
upper end of each saw blade is also inter?tted
with the slot 42 provided in the lowerend of an
adjustable upper saw grip 43 and is fastened to
this upper saw grip by dowel pin 44 and clamp
screw 45 as before. ‘ The upper saw grip is bar
with respect thereto.
a
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"
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An adjustable upper plate anchor 65 is pro
vided and is slidablyinter?tted within a vertical,
undercut guide slot 65' provided therefor in the
upper cross member of the saw frame. Thisup
per plate anchor is provided with an upwardly
facing bill or hook 66 which coacts with the slot
51 provided in the upper end portion of the back;
ing plate and is effective to control the tension
of the backing plate while leaving it free to shift
horizontally. For moving the upper plate anchor
like in construction but elongated, and a portion
of its rear face is provided with rack teeth or
worm teeth 46. The upper saw grip has tapering
side edges to adapt it to slide in an undercut
‘ upand down, and thus controlling the tension of
guide groove 41 provided in the upper cross mem
ber 26 of the saw frame. The top of the upper
the upper cross bar of the saw frame in the same
manner as the, worm 50 and interengages'iwith
cross member of the saw frame, just in back of
the guide 41, is formed with a bearing socket
49 to receive a driving worm 50.
The worm 50
the backing plate, a worm 69 is combined with
Worm teeth Til on the back of the adjustable up
per plate anchor.‘ The. worm 69 may be 'actue.
ated from a tool-engaging stud 1 I ,operatively in
terrelated with the worm through a slip clutch
meshes with the teeth 46 of the adjustable upper
saw grip. It has projecting from its lower side, 40 '52 as before. . A cover plate 13 retains the slip
clutches in the-cavities of their worms.
. I
'
and coaxially disposed with it, a mounting shaft
In addition to this mechanism for controlling
5| which is rotatably ?tted in a bearing opening
the tension of the backing plate, means is‘ pro
52 vprovided therefor in the upperv cross member
vided to shift it horizontally-that is, toward and
26 of the saw frame. A screw 53, threaded
through the upper cross member of the saw
frame, projects into an annular groove 54 of the
shaft 5i to prevent it from moving axially
although leaving it freeto rotate. Obviously,
when the worm is turned in one direction, the
upper saw grip will be moved upwardly and ten- ..
sioning applied to the saw blade, whereas when
it ‘is moved in the opposite direction the upper
saw grip will move downwardly and will reduce
or relieve the tension. To facilitate turning of
the worm 50, and also prevent overstressing of
the parts, its squared tool-engaging stud 55 is not
rigidly connected to it but rather is connected to
it through a slip clutch designated generally at
56. This slip clutch comprises a hub 51 formed
integral with the tool-engaging stud 55 and ?tted
for rotation in a correspondingly formed cavity
provided therefor in the center of the worm.
away from the saw blade. This means includes
upper and lower clips ‘l5 riveted or otherwise suit
ably secured to the backing plate and having
theirinturned ends "embracing adjusting blocks
18. ' These blocks 78 are mounted on eccentric
pins 19 ?xed to shafts 80 rotatably mounted in
the crossmembers of the saw frame and ‘con
trolled as to adjustments by means of adjusting
plates ‘8| ‘which have a segmental slot 82 therein
adapted to coast with clamping nut and bolts 83
whereby the adjusting plate'may be held in any
adjustment.
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Each saw frame is reciprocated vertically by
means of a pair of ?uidpressurermotors, desig
nated at 85 and 85, disposed on the opposite sides
of the saw frame. The motors 85 and 86 are of
identical construction and are enclosed in the
hollow uprights or standards 6 of the feed frames.
The cylinder 81 of each motor is ?xed to its feed
Spring-projected balls 58, carried by the hub and
normally interlocked with semi-spherical cavities
frame and this may be accomplished by means
59, are provided in the socket in. the worm.
' of the same bolts designated at 81', which ?x
When, however, an excessive force is placed on
the'parts, the springs yield, theballs slip out’of
the recesses, and the stud 55 turns without any
appreciable torque being transmitted to the worm.
Each backing plate P is also anchored to the
lowerv member 25 of its saw frame with respect of
any vertical movement although it may be shifted
- horizontally. For this purpose (see Figs. 10 and
11) a lower plate anchor in the form of a rec
tangular bar 60 is ?tted in a groove’ at the lower:
the'guide‘rails 33 to the feed frames (see Figure
6). ‘A piston 38 is ?tted in each cylinderv 81 _
and has a pistonrod 89 ?xed thereto and pro
jecting exteriorly through a suitable packing
gland at the lower end'of the cylinder. The
lower end of each piston rod is ?xed to a driving
arm 90 which is inter?tted with notches 90’
formed in the slides of the saw frame and secured
in inter?tted relation therewith by means of studvv
bolts 9 I. The driving arms operate through :VeIir.
2,412,221:
8
7 .
ticalzzslots provided. therefor: in the. uprights or
standards ii7 of the feed frames: and in the guide
rails 33.. ‘Obviously as the pistons 88 reciprocate
in‘ their cylinder 81, the driving arms moving
vertically. in the slots will reciprocate the saw
frames.
.
,
,
.The ‘distributing or reversing. valve 91 andithé
pilot valve 98‘ are-synchronized in theiriaction
with ‘the vertical movements of their saw'frame
S. In the construction shown in Figure'ZO these ’
valves 9'! and 98 are illustrated ‘as having a com‘
mon plunger or valve pistouIIi'S-connected by a
e
‘ The saw. frames S have a. substantial vertical
' stroke,- in the particular machine shown a. verti
lost motion connection to one 'of the'piston rods
cal stroke of six inches, The machine as viewed
matically in Figure; 20. Such jlost'motion con;
of one of the saw motors as illustrated diagram:
in Figure . 1 would appear not to providev the 10 nection includes an arm 89" fixed on the piston
clearance necessary for‘such a stroke but that
- rod 89 of one of the saw frame actuating‘motors
such clearance .is available may readily be realized
81 and formed with a hole through the'ext'ended
uponinspection of ‘Figure 15 which "illustrates
end thereofl The stem lilt’lof the‘valveipistonr.
that'the feed- frames are pocketed as at 6’ to allow
its extends through the hole in’ the arm 89’ and
is freely slidabl'e' therein within" the‘limits' 'im
posed by collars i941 and I?d'y?xed' on such "valve
the; saw frame to descend as required. Also the
upper cross member 7 of .each feed frame is
formed with a vertical‘ opening 92 to provide for
convenient access to the tool-engaging studs 55
and TI.
.
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stem.
I
.The hydraulic circuit which regulates theac
tion of the fluid pressure motor which drives each
feed frame, hereinafter called feed motor, and
such circuit for each feed and saw frame assem
'
of said valves 96a and 99a.‘
upward or return movement.
~
In. the other position of the valves 95 they
function to cause complete return of the feed
frames FI, F2, and saws B to starting position.
Each control valve95 is interconnected in a
special Way with valve means 96. The valve
means 96 is in’ reality two valves, combined into
one, for the sake of convenience and simplicity
of structure. The lower portion 91 thereof func
tions as. a distributing 0r reversing valve for the
feed motor withlwhich it is associated while the
upper portion 98 thereof is a pilot valve to regu
late» the, ‘action . of a ‘reversing or distributing
valve 99 employed for the purpose of controlling
. the operation of its pair .of saw motors 85 and 86.
j
_
> f
versing valve 99 are shown as being'piston'valv'es; ‘
3O
erations which comprise the sawing cycles; name- _
F2, and both saws B simultaneously with their
“
valve 9'5’, pilot valve Y98?, and distributing‘f'or re‘;
positions, and in conjunction with the other‘ in
strumentalities of the hydraulic circuits, to cause
continuous and automatic repetition of the op
of both saw frames S and both saws B at the
completion of’ each sawing stroke, and limited '
retraction or withdrawal of both feed frames Fl ,
~
The control valve~95,' distributing or reversing
The control valves 95 function, in one. of their
ly, downward movement of both saw frames S
and-both saws B on each sawing stroke, simul
taneous feeding movement of both feed frames
'FI, F2, and of both saws B into the work'on
each sawing stroke, upward or return movement
"
95) in‘ cooperative relation to cam or Wiping ?ngers
99d and 9% connected to the rotary member;
bly. In each of these hydraulic circuits the pump
I6: has its discharge port connected .by conduit
93' to the intake port 94 of a control valve desig
'
j
550 may be mounted on one of the driving] arms
frame, hereinafter called saw motor, is illustrated
diagrammatically in. Figure 20. There is one
Y
~
96 and 39, respectively, of Figure» 20. When 1
rotary valve means‘ are employed,‘ cams 96b and
the ?uid pressure motors which drive each saw
natedigenerally'at 95.
"
Figures 12 and 13d diagrammatically illustrate
that rotary valve'means designated at 96a and
99a may be employedin lieu of the valve means,
This, or‘ course, is for the sake of illustration;
Obviously, rotary valves or other suitable types
of'valves might be employed.
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; _‘
However, in the construction'shown, the con‘
trol valve 95 has a valve casing ~or' valve body
E95 preferably of cylindrical form. Opposite‘ or
angularly spaced from its intake port 94; are two
outlet ports I96 and‘ I97, these ports being located
' symmetrically with respect to the intake port 94
in a direction lengthwise of the valve body.
Axially spaced from the ports ass and I0? and on
the same side of’ the valve are returnports I08
and I99‘. On the opposite sideof the valve from
the outlet and return ports’and axially spaced
from the intake ‘port 915 are discharge] ports HE!
and Ill. The piston or plunger I?I of the control valve 95 is provided withv a piston headfI ['2
which in the position shown inFigure 20_ blocks
connnunication between the vintake porto?tfand
the outlet port IIl‘I, but establishes ‘communica
tion between this intake port 94 and the outlet .
port I 96. ' Any communication between the intake
port 94 and the return ports IE8 and I09 ‘is’
blocked by'piston heads H3 and I I2 ‘suitably mag
chined onthe piston of ‘the valve.
7
j j‘ 1
‘Communication betweenthe return ports I 09
and H39 and the discharge ports ll?'and I! I'is
under the control of piston heads H3 and Hit
provided on the piston of‘ the valve.
' "
.
The distributing‘ or reversing valve 9'!‘ an‘dythe 7'
Of course'the distributing or reversing valve 9'!v 60
pilot valve ' 99 ' have, 'in the‘ constructionillusi
and the pilot valve 98 could be separate valve
trated, a common valve body H‘! which also may ,
structures.
'
be,‘ of cylindrical form.‘ The distributing o'rjrel:
:The control valve 95 ispreferably electromag:
versing valve section. 91. of tthis ‘common valve'
netically controlled and for thispurpose it may‘
body is provided on one side 'withiports H8, H9
have
solenoid I03 combined with its valve
and I29; and on its opposite sidejwith' ports'___ll2'l..
plunger or piston I?l. vWhen the solenoid is’
and I22; .Notonly does this valve means 96 which
energized it raises the valve piston Mil and-so
is comprehensive of the two v‘valves’named;have
positions the valve as tov provide. for vthe auto
a common valve body, but it also has the common 1
matic repetition of theoperations'which com?v
prise the sawing cycles. .When the solenoid is 70 valve piston or plunger 5 B3. The lower sectionof
this piston or plunger I03 which functio'nsaslan
deenergized the valve piston IOI, underthe in
element of the distributing or reversing valve is
?uence of suitable biasing means, such as a coil
spring £922, is shifted to its other position wherein
’ it effects-complete return, as will be hereinafter
more fully : described.
.
_
provided with pistonv heads designated at I23,
I24 and I25.
The upper or pilot section 980i
the valve body II‘! is provided on ‘one side with
' ports I29, I21 and‘ I28, and on its opposite‘ sides"
2,412,311.
with-ports» I29 and I30. The upper section of
10
'20, but for a limited distance only, since it can‘
the piston or plunger serving the pilot valve 98
only move as far as the pistonallllibvof the stroke
isyprovided>;with';piston heads =I3I, I32 and‘ I33.
limiting. device I40 will allow it. There is, how
ever,-a limitedmovement sufficient for adequate
Intermediate the distributing or reversing section
91 of the valve means 96 and its pilot section 98
the common plunger I03 of the valve is provided '
withdrawal or retraction of the saw from its
workduring its return stroke. The ?uid under
with a’ blocking and guiding piston head I34
pressure displaced by the stroke limiting device
which is aqworking fit in the intermediate ‘portion
I740 moves back through conduits I39 and I36;
to port I2I, them across to port H6, and from
of the valve body.
;
1
.
'
-
>
-
.»_The vfeed-‘port I06 of the control valve is con
nected by‘ a rpipelor= conduit I35 to the port H6
offthe distributing or-reversing valve 91. This
port I I9 of the distributing or reversing valve 97
port I I8 through conduits Hi8 and I44, to return
port; I69, then across to discharge port III‘ and
back through the pipes I45. and I46 to the sump.
'lDuring?the time that the feed, cylinder II is
alternately communicates with the ports I2 I ; and
feeding its feed frame and consequently the saw
I22, communication between the port H9; and
the port I2I occurringqwhenuthesaw frame is
into the work, the saw frame is being driven
atv the .top of- its, stroke.
As the ‘saw frame
descends, this communication between ports H9
downwardly through its sawing stroke by means
of the ?uid pressure motors 85 and 86.1 On the
other hand, when the feed cylinder is actuated.
to withdraw .or retract, theyfeed frames and con
the lower end of its stroke'the piston head I24 20' sequently the saws from the work, the saw frames
and YI2I is blocked and as the saw frame reaches,
moves downwardlyf'to provide forv communication
between the port IIQ-andtheport I22. The port
I2I connects by means of a pipeor conduitl36
with a feed pressure control-I31 of standard con
structiornand also with the gauge I38. A branch
conduit I39 in‘ open~~communication with the
conduit I36 connects'to a stroke limiting device
I40,'the latter in turn connecting through a pipe
or conduit [4! with .one end of'the feed cylinder
are being moved upwardly by- the motors 85 and
86 on their return stroke. The motors. 85 and
86; are servedby a separate pump designated at
I50 supported with the pump I6, on the bracket
I6’ and like the pump I6 driven by the electric
motor H. The discharge port of the pump con
nects to aflow'controland relief valve I5I of
conventional construction, which in turn has a’
pipe line I52 leading'therefrom. A gauge I53
EI. The, stroke limiting device I40 is identical 30 may bev tappedinto pipe line I52. A conduit
I53’ leads -from ,the‘pipe line I52 to the intake
With that described and claimed in United States
Letters Patent No. 2,202,256, granted May 28,
por-t I54 of the four-way valve 99 which controls
and‘ having av checkgvalve I400 therein which
permitsthe free flow of the ?uid pressure through
they-piston I401) in one direction, but blocks all
side of the valve bodyas-l the intake port I54, ‘are’
thence across the valve to port I20, through
pipe. lines I43‘ and I44; to the return por-t I09,
reversed and ?uid under pressure is supplied to
the distribution» of the ?uid pressure to the mo
1940, to .0‘. M. Jensen et al, for Hydraulic feed‘
tors 85 and 86. , This valve 99 is of conventional
for; powersdriven ‘hack saws, and comprises in
general'a cylinder I40a and a piston I451) (see 35 construction and is shown diagrammatically as
having a1 cylindrical valve body I55. On the same
Figure '18), the ~piston I40ba.being of limited stroke
exhaust ports I56 and I5'Iwhich lead-back‘ to
the oil sump or reservoir. On the opposite side
?ow through the piston. I40b in the opposite direc 40 of-the valve: body from the ports I54, I56 and
I5'IYare, outlet ports ;_I58 and I59. Conduit-.160 '
tion'. 'I-Ioweven' when the pressure ‘is exerted
leads from the outlet port I58 and has branches ‘
against the check valve I400, the piston‘ may
I61 and I162 leading. to thelower ends of the
move a'limite'ddistan'ce'and consequently permit
cyIindersB'IofY-the?uid pressure motors 85and
a limited displacement of 'the fluid under pres‘
sure. The function of this device is to allow the 45 86.. Similarly, a conduit I63 leads from the:out-:
let port ,I59,and has branches I64 and I65 com-i
full force of the ‘hydraulic ‘pressure to feed the
municating with the upper ends of the ¢ylinders
saws into the work, butto limit the extent ‘of their
81 of-"the motors~95 ‘and 86. The valve proper
withdrawal or retraction on each return stroke.
is in theform of a piston. I66 shiftable length
’ Withthe valves in theiposition' described, the
fluid under pressure is supplied to the left-hand 50 wise in the valve body and, having three vpiston
heads serving in one position of the piston to
end of'the feed cylinder II, as viewed in Figure
supply ‘.I?uid- under pressure to the upper ends
20,‘ and the cylinder II is driven with respect
of the cylinders 81 of the motors 85 and 86, while
to its piston I2 to feed‘its'saw into the work. _ At
at the same time exhausting ?uid under pressure
thesame time ?uid is exhausted from the opposite
end‘of' the cylinder, since it flows through con- . from thellower ends of such cylinders. In the
other position of ‘the piston I66 the action is’
duitor pipeline 142 to‘port I22 of valve 91,
the lowerends of the cylinders 81 of the motors
05 and 86 while it is exhausted from the upper
through the valve95, to the‘ discharge port III,
ends thereof. This piston valve I66 is ‘auto
and then through pipe lines I45 and I46, back so matically
shifted, and‘ ‘shifted in synchronism
to-ythe sump or oil reservoir. 7
"
with the other operations by‘ the pilot'valve 98.
At the completion of the'sawing stroke, the
For thispurpose one end of the .valvebody'I55
valve plunger I03 has moved downwardly from
is ‘connected by pipe~ line .161. to the port. I29
the position shown inFigure 20 to the lower
01", the pilot valve, Whereas the opposite end of
limit of its stroke, so that the circulation or
thebody is connected'by pipeline I68 to’ the
distribution of {the fluid under pressure is ‘re
port
I30 of the pilot valve. The'intake port I2‘I
versed;:for lat'suchtime the ?uid pressure flows
0f the pilot’ valve is connected to the conduit I52‘
from. the port I06 ofthe control valve through
and consequently receives ‘the pump pressure.
the pipe line or conduit I35,‘ port “9, as before,‘
The ports I26 and H6 of the pilot valve are con
but'now theport. I:2I is blocked, whereas the
nected by. pipe lines I69 and H0 to the oil reser
port I22 is incommunicati'on with the port‘ II9.
voir- or "sump.
‘
‘
'
f
'
I
}
Consequentlythe ?uid-pressure ?ows from the‘
With this construction when the piston of the
port I22 throughia conduit 141 which connects
pilot valve .98 is in the position-shown in Figure
withhthe conduit I42. fThereupon. the cylinder:
20, ‘fluidiunder pressure flows through the pipe
II is displaced to the right “as viewed in Figure‘
litigant
,
1'1.
,
,
7
line I-52 to port I127, then across the/Valve :to
i2
_
a
,
,
est-mush; many: of its ‘features may be empieyea'
heal I129, thence up th'roiighI the pipeline I61‘
to advantage where-only}- av single saw- is used.»
to-ithe" right-hand end-1 of the- valvel-body ‘I55,
In- such a case thee-wonder-e;euise been ‘5 V
ohe-fejed-ira‘riheand one ‘saw fra e.-- -
The pressure supplied to ' the right-hand éndr' of
the valve body l55 shifts this piston I66 ‘to the
lei-t, thereby causing the‘ ?uid under pressure
While I have‘ shown and: described one 00
'structionin which the invention may be have-he
?owing-to the intake port I54 to be supplied to
the outlet port I59’ and ,through'the pipe line
,tageou‘sly embodieddt is to be understood
I
the construction shown ‘has been selectedi'merely
I63‘ and its branches I 64¢ ‘and I65'to thelupper'
for the purpose of illustration{Mi-example,"and?_
end of the cylinders 81 or the motors 85 and 10 that? various changes in the size, shape, and ar
$6.4 The sawing! stroke ensues: Alt-the same time,
rangement of the parts may be made withoutvd- Y» , .
the ?uid under pressure is’ exhausted from the
parting from the 'spirit'ef'the‘invention d
lower ends of the" cylinders- 81' of the motors 85
scope of the subjoined claims
'
and: 86 through the pipeline I66 and its branches
, I Bil-"and I62,- to port I58,»and across the valve
to --the exhaust port I56.
15
Iclaimzj.
"
,
1'
7
'7
» 1'.= A metal sawingmachme comprising-‘1a hblléw
base, a feed-frame having hollow Vertical side" , ' '
EYUpoéri the completion of thes'awing- stroke the
pilot'valve is shifted downwardly so as- to block
members and upper and lower" cross 'me'mbefs
hen I3Elq~ When this occuii's'r?uid under pressure
within the con?nes of the hollow base'andinter-f
connecting said, side members,inter?tting guid
cdrhmuhibation between the intake port I27‘ and
ing- ways between the lower- cross member and the
C‘i?t'l'e'tf port I239,’ while establishing communica 20 base to constrain the feedframe to horizontal rei-i
Vtié'r'i between the inlet port I27 and the outlet‘
ciprocatory movement, a, ?uid pressure‘ motor
?dws fro'iii' the-outlet port 130 through the pipe
connected ‘with the base and'the lower~crossi "
or eoh'duit I63 to the left-hand ‘ends of the valve
member-for reciprocating the feed frame, a’s'aw
bed" F55; 'Valv'e piston‘ IE6 is‘ then-shifted to
the right with the‘ result that ?uid under pressure
frame inter?tted withv guiding ways on the‘ ver- V r
tical .side members and-constrained to vertical"
is" supplied to the lower _ ends of the cylinders
reciprocatory movement, "and ?uid pressure ‘moa
81 of the'ino'tors; 85 and‘ BB and exhausted from
tors housed in the‘ hollow vertical side‘ members
and‘ interconnecting the side members and the -
theuplper' ends of these cylihde'rs;
,
-
a '
when the solenoid I03 is deenergized and the
pistes of, valve 95 drops'to' its lower position, the
saw‘frame' for reciprocating the saw frame,
'2. A 'metal sawing machine comprising a. base,
a feed frame inter?ttedwith guiding ways on the
base for reciprocatory movement, said feed frame
valve'ineans- 96 is bypassed and a hydraulic cir
cL-ii is e'stfablislhedato the‘ feed motor through‘ the
control‘ valve 95 te cause the feed motor to ‘effect
eempieteiethr'h of the ‘feed'frame, thatis' a full
having hollow side members‘ga saw frame inter; V V ’
' ?tted with guiding ways on thev side members
returnitds‘tarting ‘position; At such time ?uid
under pressure-news from-'iritake po'rt9'4 of valve
forreciprocatoryrinovefnent, relative‘ to‘ the feed
frame, a saw blade ?xed‘, to the saw frame, fluid _
" as acrb‘ss-t'o outlet port 101 and then thro'ughva
pressure motors for reciprocating the ‘saw frame, I
saidmotors being housed in the hollow sidemema ‘
Iii-lid liliél IJ'H} tqpipe line!” and into the right‘
hand end: of cylinder H as‘ viewed‘ in Figure 20'. 40, bers. and "including cylinders ‘fixed to the side
Fluid" pres'siire is exhausted ‘from the‘ opposite end
members ‘and pistons voperatively connected
of? cylinder. I! through pipe Mite pipe I12;- Pipe
l-riz 1ead§teport~ms which'i'n-lower positidh oi
thesaw
A metal
frame.
sawing
‘ machine
. g
,
comprising’
»
v a sta-j
, control valve 95 is'ifi- communication with'dis-F'
tionary frame, a feed frame ?tted to guiding ways j
on the stationaryrframe, said feed frame compris
in'g cross members and hollow aside members con
charge" port. I‘ I 0. Port II I]- eemmuhiee-tes' through
pipe J13 with pipe I46 leading‘ back to- sump;- ‘
j
electric Cil‘CllilS
‘the ‘1 11101161‘ l1 "WhiCh'
nected. to thercross members, guiding rails ?xed
drives'the' pumps combined with each'feed frame
to the side members of the feed frame and hav- a
is showh'iii diagram in- Figure 19. There'is n0t-h-_
ing confronting V-shaped guide grooves, a saw
ing! s'peciah'about the circuit itself; Any standard V50 frame including cross members and side mem'-'
Ici‘rcuitu'n‘ay be employed‘. It is desirable to'ins
corporate‘ in the vcircuit a‘ starting switch I16; a
stepping switch I11 and are‘versing switch H84.
In additioma left-hand andra right-hand micro
swi-tchidesignated atI'I9 and [80; respectively, are
incorporated in the circuit. These switches I79
and 1185 ‘are preferably incorporated- in a single
, housingsls-I ,(see Fig. 1)T?xe'd to the lower portion
ofthe feed’ frame‘ and their operating pluhgers
coactwith adjustable trip cams I82 and I83. The
cams: I8,,2;and I'83' are adjustable along a [slotted
guide; i841 carried’ by the base, oil the machine;
The guide tall may ‘be provided withaf sealel85
bers connecting said cross members, the} side
members of'the-sawframe being formed/with‘
VJ-shaped slides inter?tted .with the‘ Veshaped
guidegrooves vof the guide rails, the hollow meme
55
bers- of the vfeed frame and the guide rails having
registeringislotsgaj. pair of ?uid: pressure motors
for reciprocatingthesaW frame, saidmotors be
ing disposed in the hollow members of the feed
frameand having'cylinders ?xed to said hollow
60 ‘side members of the feed frame, pistons ?tted inv
the cylinders and having pistonirods- projecting
exteriorly thereof, and driving arms securedto‘ :
the ,slides' of the/saw frame extending through‘
to‘ facilitate precision Y adjustment of the trip
said, slots and ‘?xed ‘to the, ends of. the» piston
cams; "The trip cams I82 and I83 maybe ad 65
justed'f tov cause the sawing to start at any selected
4-. A metal sawing machine comprising a hollow
rods-4
startingipoint' and proceed to any other selected
stopping point within the'rang‘e of action of the
machine, and when the sawing has progressed to
‘
‘
>
‘
base, a pair of parallel undercut and longitudi
nal-l-y extending guiding rails, ?xed to the top of.
thebase, a feed frame of rectangularconstruce ,
the ‘stopping pQl'nt- the trip cam I82 acting on 70 tion and including hollow vertical side members
micro-switch‘ I18 reverses the action‘fan'd causes ‘and hollow upper and'lower cross members 0011-‘
the feed frame to return automatically to its
ne'c‘ted-to the‘ side members, the lower cross ‘them, '
§ihrlliilgp?sitions
.
.
'
'
While the‘invention is capable of advantageous
her having guide grooves onits underside 'slidablyl
int'er?tt'ed with the guiding railslon the basefa
' embodiment in- a' duplex type ofsawingmachine; 75 sawxffam'e supported onthe vertical members‘ 6f '
,
2,412,811:
13'
14
,
the feed frame forlrvertical' reciprocation,;gand
of the wormjwhile'preventing the placing__ of an
means for reciprocatingv the feed frame and com
excessive tension on the backing plate;
I
prising a?uid pressure‘ motor containedrin the
:10, In- a metal sawing machine,‘ the combina'-.
hollow base and including a cylinder ?xed to the
lower cross member of the feed frame, a piston
tion with a reciprocating saw frameand a saw
in said cylinder, and apiston rod connected, to
thepiston projecting exteriorly of they cylinder
b1a_de,_means for stretchingthe backingwplate and
blade, of a‘backing plate engageable with the saw,
ciprocatingsaw frame, a-saw blade, means for 10
anchoring one end of the saw blade to the saw;
holding it taut in the saw- frame :while constrain;
ing it to, bodily movement toward and away fromI
the saw blade, a pair of clips fixed to the backing,
plate, ‘an adjusting block cooperable with’ each
clip, an adjustingshaft for each block, each ad-._
frame, a bar-like saw gripsecured to the other
justing shaft having an eccentric pin operatively
end of the saw blade and slidably inter?tted with
the saw- frame, a rack on said sawgrip, and a
inter?tted with its blocks, and means for-rotativea
Worm rotatably mounted on the saw, frame and
them‘ in adjusted position.
and
Y 5; anchored
A metal sawing
to the base.
machine
comprising
l ;
, > alre
v
ly adjusting said shafts and releasably securing,
,
v
a
11. A'rnetal sawing machine comprisinga stall
meshed-with the rack whereby when theworm is,
turned in one direction the saw blade is placed
tionary frame, a feed frame inter?tted with guid- -
under tension.
ing wayslon the stationary frame for horizontal
‘
1
p
‘
6. Ajmetal sawing, machine comprising a re
reciprocatory movement with respect thereto, said:
ciprocating saw frame, a saw blade, means for 20 feed frame having opposed vertical side members,
cross connected at their upper and lower-ends, a
anchoring one end of the saw blade to the saw
vertical guide rail ?xed to the inside of each- side
member, said guide rails having confronting, .ver,—,
tically extending V-shaped guide grooves, a-saw
frame having vertical side members-crosscona
nected at their upper and loweriends, said, side
frame, a bar-like saw; grip secured to the other
end of the saw blade and slidably inter?tted with
the saw frame, a rack on said saw‘ grip, a Worm
rotatably mounted on the saw frame and meshed
with therackdwhereby when theworm is turned
members of the sawlframe being‘providedfwith.
V-shaped slides slidably inter-?tted with theguide
grooves of said rails, a saw‘blade carried by the;
saw frame, means vfor reciprocating the ;feed
frame, and means for reciprocating the saw frame.
12. A duplex metal sawing machine comprising‘
a stationary frame," a pair of four-sided feed
frames supported ion the stationary frame'for.
in one direction the saw blade is placed under
tension, a tool engaging stud, and a slip clutch
interconnecting the stud and worm to provide for
rotative adjustment of the worm while preventing
the‘ placing of an excessive tension on the saw
blade.
v
1
.
,
.
,
7. In a metal sawing machine the combination
withareciprocating saw frame and a saw blade,
of a backing plate engageable with the saw blade,
horizontal movement with, respect thereto, a four-:
said backing plate having thickened ends ‘formed
sided saw frame supported on each of said frames
with elongatedslots, an anchor for one end, of
- for vertical motion relative thereto, ,saidusaw
the plate including a, bar-likemember fastened
to the saw frameand having an undercut hook
?xed thereto and engaged in the slot of the ad
frames having portions offset outwardly ‘from the
cutting plane and having portions lying‘closely
adjacent the cutting plane, saws ?xed to the por
tions'of the saw frames lying closely adjacent the
cutting plane, said saws operating in a common
'jacent end of the backing plate, an adjustable
anchorI for the other end of the backing plate
comprising a bar provided with, a hookengaged
in the slot in the adjacent end of the backing
plate, said slots being longer than the hooks to
cutting-plane and being oppositely-disposed with:
their saw teeth confronting, means for ‘recipro
eating the'feedframes and means for recipro-z:
permit the backing plate to move toward and
away'fromthe sawblade, a rack on the adjust
eating the saw frames.
'
~
'
.
,
.
- j
- 13. A metal sawing machine comprising a, sta;
able; anchor, aworm rotatably mounted‘ on the
saw frame and meshing with the rack, and means
for shifting the backing plate toward andaway.
tionary frame, a pair of four-sided. feed frames
inter?tted with guiding ways on the stationary
from the saw blade.
thereto, a four-sided saw frame inter?tted-with
'
'_
r
-
frame for horizontal movement with respect
8. In a metal sawing machine, the combination
guiding Ways on each of said feed frames fort
with a reciprocating saw frame and a sawgrblade,
vertical movement with respect thereto, said sawi
frames having portions offset outwardlyfrom'
of a backing plate engageable with the saw blade,
means for anchoring one end of the backing plate; 65 the;;_cutting plane and having portions lyingv
closely ‘adjacent the cutting plane, confronting
to the saw frame, a rack connected to theother
end‘ of the backing plate and slidably inter?tted
saws ?xed to the portions of the sawframes lying
with the saw frame, ‘and a worm rotatably sup
ported on the saw frame and meshed with the
rack whereby upon rotation of the rack in one
closely adjacent the cutting plane and‘ operat
ing inv said'cutting plane, means for reciprocat
ing the feed frames, means for reciprocating the"
direction the backing plate ;Will be placed under
tension and held taut in the saw frame.
,
f 9. In a metal sawing machine, the combination,
with a reciprocating, saw frame and a saw blade,
saw frames, and control devices operated insyn
chronism with the motion of the saw; frames
for causing the saw frames to simultaneously
partake first of sawing strokes and then of re
of a backing plateengageable with the saw blade, 65 turn strokes and for causing the feed frames to"
means for anchoring one end ofthe backing plate
feed the saws into the work on each'sawing
stroke and then retract them a limited distance
to, the saw frame, a rack connected to the other
end of- the backing plate and slidably inter?tted
with the saw frame, a wormvrotatably supported
on the saw frame and meshed with the rack;
whereby upon rotation of the rack in one direction
thebacking plate will. be placedunder tension
on each return stroke.
7
-
1
14., A metal sawing machine comprising a sta
tionary frame, a pair of feed frames inter?tted
with guide ways on the stationary‘ frame'for
horizontal reciprocatory motion with respect
thereto, a saw frame inter?tted with guiding
and held taut in the saw frame, a tool engaging
stud, and a slip clutch» interconnecting the stud
Ways on‘ each of“ said feed frames‘ for vertical
andthe worm‘ to provide for. rotative adjustment 75 reciprocatory motion with respect thereto, 1a
£3,412,511
17
18
mounted on the feed frame and carried thereby,
the frame relative to the base, a saw frame guid
valves for distributing the ?ow of ?uid pressure
ed on the feed frame ways for reciprocation rel
from the source to the several motors, a valve
ative to the feed frame, the ?uid pressure motors
actuated by the saw frame to control the supply
mounted in the feed frame hollow portions and
of ?uid pressure to the distributing valves where 5 interconnected with the saw frame for recipro
by movement of the feed frame feeds the saw
cation thereof relative to the feed frame.
into the work on the cutting stroke thereof and
23. In a metal sawing machine, a base having
then retracts the feed frame whereby the saw
a hollow portion and having guideways thereon,
is moved away from the work during the non
a feed frame guided on the ways on the ‘base for
cutting stroke thereof, and a valve electro-mag
reciprocation relative to the base, the feed frame
netically movable into position to by-pass the
having hollow portions and having guideways
distributing valves to cause withdrawal of the
feed frame and the saw entirely away from the
work.
22. In a metal sawing machine, a base having
formed thereon, a ?uid pressure motor compris- ~
ing' a cylinder ?xed in the hollow portion of the
base and a piston movable in the cylinder and
connected with the feed frame for reciprocation
guideways thereon and having a hollow portion,
thereof relative to the base, a saw frame guided
a feed frame guided on the base ways for recip
on the feed frame ways for reciprocation rela
rocation relative to the base, the feed frame hav
tive thereto, and ?uid pressure motors mounted
ing hollow portions and having guideways formed
in the feed frame hollow portions and connect
thereon, a ?uid pressure motor mounted in the 20 ed with the saw frame for reciprocation thereof
hollow portion of the base and interconnecting
relative to the feed frame.
the base and the feed frame for reciprocating
ADAM ZISKA.
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