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Sept. 1.7, 1946.
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Filed Feb.>23,i 1942
9 Sheets-Sheet l
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Sept.‘ 17,1946.
‘ 2,407,913
Filed Feb. 23', 1942
9 Sheets-Sheet' 2
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Sept. 17,.1946.
Filed Feb. 23, 1942
9 Sheets-Shee't 3
I Sept. v17,1946.
Filed Feb. 23, 1942
’ 9 SheetS-ShIeetA'
Sept. 17, 1946.
Filed Feb. 23, 1942
9 Sheets-sheaf 5
BY: om?!” W-MRKER
773”. (V Cwmn
Sept-‘17; 194.6-
_ 2,407,913‘:
Fileq Feb. 23, 1942
9 sheets-sheet e "
- ‘Sept. 17,1946.
Filed Feb. 25, ‘1942
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9 Sheets-Sheét 7
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Sept. 17, 1946.
Filed Feb. 2:; 1942v
9 Sheets-She‘et’8
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Sept. 17, 1946.-
Filed Feb. 23, 1942 -
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Wil/1 W
Patented Sept. 17, 1946
Joseph B. Armitage, Wauwatosa, and .Orrin W.
Barker, Milwaukee, Wis, assignors to Kearney
& Trecker Corporation, West Allis, Wis., a cor
poration of Wisconsin
\ Application February 23, 1942, Serial No. 431,908
20 Claims.
(Cl. 90-21)
This invention relates, generally, to machine
within the range ofequivalents of the features
de?ned in the subjoined claims.
The ‘foregoing and other objects of this inven
tion, which will ,be more readily discerned from
the following detailed description, may be
achieved by means of the illustrative apparatus
depicted in, and described herein in connection
tools and more particularly to improved machine
tool operating and controlling mechanism of the
type especially adapted for utilization in milling
A general object of the invention is to pro
vide improved structuralarrangements and actu
ating mechanism for a machine .tool ;
with, the. accompanying drawings in which:
Another object is to provide an improved
Figure 1 is a general View in front elevation
power transmitting mechanism for actuating the 10 of a milling machine exemplifying the type of
movable elements of a machine tool;
machine tool in which the present invention may
Another object is to-provide animpro-ved trans
be incorporated to advantage;
mission mechanism and controlling apparatus ar~
Fig. 2 is a view in side elevation of the milling
ranged to be removable from a machine tool as
machine shown in Fig. 1, with parts broken away;
a unit to facilitate inspection and maintenance 15 Fig. 3 is a ‘detailed view in perspective of a
clamping device for the overarm structure of the
Another object is to provide an improved con
millingr machine;
trol mechanism for the operating elements of a
Fig. 4 is a partial view in perspective, showing
machine tool;
Another object is to provide an improved hy
draulically actuated control apparatus for a mill
the vertically movable spindle carrying head;
ing machine;
Fig. 5 is a View partly in plan and partly in
horizontal section taken along the line 5—-5 in
Fig. 1.
Another object is to provide an improved auto,
Fig. 6 is anenlarged view in rear elevation of
matic ‘reversing trip mechanism for a movable
the milling machine ‘with parts broken away to
.25 show internal mechanism;
Another object is to provide an improved clutch
Fig. .7 is an enlarged view largely in vertical
actuating control mechanism for a machine tool.
axial section through the spindle ‘carrying block,
A further object is to provide an improved driv
showing the spindle driving transmission mech
ing arrangement for a Work supporting table of
element of a machine tool;
a machinetool.
According to this invention, a milling machine
is provided with an improved spindle driving ‘
mechanism arranged to afford a @ries of spindle '
speeds in two ranges. Likewise, an improved rate
changing feeding mechanism for the Work sup
porting tabie is provided with pick-oil change
gears and an improved hydraulic automatic re
Fig. 8 is a detailed View of the gear shifting
mechanism in the spindle transmission;
Fig. 9 is a view in perspective of the gear shift
ing yoke;
Fig. 10 is a fragmentary sectional view of one
end ‘of the work supporting table showing the
screw supporting bearing bracket, taken largely
in vertical section along the line l0—.lil in Fig. 2;
versing mechanism, the hydraulic mechanism be
ing mounted with the pick-oil gearing to consti
Fig. 11 is a fragmentary plan view of an im
proved table screw driving mechanism;
Fig. 12 is an expanded diagrammatic viewof
tute a unitary structure that is readily removable 40
the spindledriving speed changing train;
from the machine for inspection. The hydraulic
Fig, 13 isa fragmentary View in vertical section
control system includes improved means ‘for ef
through the bed of thevmachine, taken along the
fecting automatic reversal into movement at
either feed or rapid traverse rate, and actuates-an 45 line .!3—l_3 in Fig. 1, showing the ‘table driving
power transmission train;
improved selective main clutch controlling‘ sys
Fig. 14 is afragmentary view taken in horizon
tem‘that may be utilized for stopping the spindle
tal section along the line M—I4 ‘in Fig. 13;
automatically when the rapid traverse drive is
Fig. 15 is an enlarged fragmentary View in ver-‘
tical section taken along the line 15-15 of Fig. 1,
The invention is exempli?ed herein by an em 50 showing the trip mechanism for controlling the
bodying machine tool structure, but it is to be
movement of the work supporting table;
understood that the particular apparatus set
Fig. 16 is an enlarged View of the tripping post '
forth is intended to be illustrative only and that
with parts broken away to show the internal con
the various individual characteristics may be em
struction; and,
bodied in other structural forms, all coming 55 Fig. 17 is ‘a schematic circuit diagram of the
hydraulic control system for effecting automatic
operation of the milling machine.
The particular machine tool illustrated in the
drawings as exemplifying a practical embodiment
of the principles of the present invention, is a
milling machine of the bed type, similar in gen
eral form and arrangement of parts to the mill
ing machineshown in United States Patent No.
2,118,357 issued May 24, 1938.
bolts 38 which operate in T-slots 39 in the for
ward faces of the uprights and project through
the lugs 34 and 35 of the head to clamp them '
against the forwardflat ways.
To provide for horizontal ‘adjustment of the
position of a cutter carried by the spindle 26, the
spindle is rotatably supported, by means of anti-v
friction bearings iii and £12, in the ends of a cylin
drical quill structure 43 which is slidably mounted
Referring more speci?cally to Fig. l of the 10 for axial movement in. the head 21, as shown in
' Figs. 2 and 7. Axial adjustment of the position
drawings, the milling machine there shown com
of the quill is effected by turning a hand wheel 44
prises essentially a hollow bed or base 29 that
at the side of the upright 23, the hand wheel being
constitutes the main supporting frame of the
operatively connected to the quill in well known
machine and forms a housing for the driving and
'15 manner and provided with a graduated dial 45
controiling mechanism.
to indicate the longitudinal position of the spindle.
On the upper forward surface of the bed 29,
After the spindle quill has been moved to an
a work supporting table 2i is slidably mounted
adjusted position, it may be clamped to the
for reciprocating movement longitudinally of the
spindle block by turning a clamping nut 46 which
bed. At the rear of the table, a pair of uprights
22 and 23 are securely fixed to the upper surface 20 draws a clampingelement it‘! into engagement
with the quill, as shown in Fig. '7.
of the bed 2!} in spaced relationship and are
Above the spindle 26, a pair of overarms 5| and
joined at the top by a cap 24') to constitute a
52 are slidably mounted in the spindle block 21
rigid upstanding column structure. As shown, in
in manner to extend forward to support a cutter
Fig.2, the column structure serves to support a
carrying arbor, as shown in Fig. 2, the arms being
,rotatably mounted tool spindle 2E5 in cooperat
connected at their forward ends to the bed 20 by
ing relationship with the work table 2 I.
To provide for adjusting the position of the
spindle 2% ‘relative to the work table 2 l, the
spindle is carried by a spindle supporting head or
block 2'! which is slidably mounted between the
uprights 22 and 23 for vertical movement. Ad
fjustment of the vertical position of the spindle
head is ‘effected by turning a combined hand
wheel and nut 28 which abuts against the top of ,
the cap 24 and has threaded engagement with a
screw 29 the lower end of which is ?xed in the
spindle block 2'5, a graduated dial 38 being pro
vided on the nut for indicating the amount of
means of a harness structure 53. As best shown
in Fig. 6, the upper part of the head 21 is provided
with a kerf 54 extending horizontally between the
arm receiving bores to provide a resilient portion .
that may be de?ected for clamping the arms. For
this purpose, a clamping screw 55 is provided be
tween the arms at each end of the head 21, the
screws being ?xed in the head beneath the kerf
54 by means of pins 55,
Clamping nuts 51 are 7
threaded on the upper ends of the screws 55 in
manner to bear-upon the top of the head and are
adapted when tightened to de?ect the upper por
tion of the head 21 into clamping engagement
' As best shown in Fig. 5, the spindle head 21 is 40 with the overarms. To provide for tightening the
provided at its sides with projecting angularly
,disposed vertical guiding ways 32 and 33, respec
tively. The forward sloping surfaces of the
' angular ways have sliding engagement with com- ,
plementary angularly disposed surfaces formed
in the uprights 22 and 23. At its forward edge,
the‘spindle block 21 is provided with laterally pro
jecting lugs 34 and 35 which have sliding en
gagement with flat ways formed in a common
‘two clamping nuts simultaneously,_ each nut is
?tted'with an arm 53 the arms being intercon
nected by a link 59 pivoted at its respective ends
to ‘the end of each arm.
As shown, the forward "
nut 51 is provided with a wrench receiving hex
agonal top by means of which both nuts may be
tightenedto clamp the overarms equally at both
ends of the head. As best shown‘in Fig. 3, each
nut 51 is provided with peripheral serrations
which are engaged by complementary internal
serrations in the cooperating arm 58. By reason
plane on the forward faces of the uprights 22
and 23 respectively. The angular way 33 on the
of this serrated connection, each arm 58 may be
head is provided with an adjusting gib 31 which
adjusted angularly relative to its cooperating
may be tightened to effect accurate sliding en
nut 51 in manner to equalize the clamping‘ pres
gagement between the head and the uprights.
As may readily be seen, when the gib 31 is tight 55 sure exerted at the, respective ends of the head
21. This arrangement provides for correcting
ened it moves into engagement with the com
any inequality which may result from wear be
plementary way in the upright 23 and draws the
tween the nuts and the screws or the head,rsince
lug 35 against the forward face of the upright.
Simultaneously, the wedging action of the gibv the arms may be removed readily from the nuts
vat any time and re-engag'ed with the nut serra;
upon the angularly disposed sliding surface of
tions at the position of adjustment providing for
the upright 23 forces the entire head 2‘! to the
equal clamping pressures.
left and effects a similar wedging action between
Power for moving the Work table 2| and for.
the sloping forward face of the way 32 and the
rotating the cutter spindle 26 is derived from an
plane face of the lug 34 upon the complementary
electric motor 6! mounted in the hollow bed 20,
surfaces of the upright 22, clearance spaces being
as indicated in Fig. 6, and connected by multiple
provided between the other surfaces-of the head
belts‘ 62 to a main driving pulley 63. As best
and the uprights as indicated in the drawings.
This arrangement provides for effecting close
adjustment between the sliding head and the
cooperating ways of the column structure to in
sure accurate movement of the head. After the
shown in Fig. 13, the driving pulley 63_ is rotat
ably mounted at the rear of the bed by means of
70 an inwardly extending hub 64 journalled in a
pulley bracket 65 secured in an opening at the
back of the bed,’ the pulley and belts being en
closed within a housing 66 provided with a hinged
turning the hand wheel 28, the head 21 may be. " ‘covenportion 61. 1 For transmitting power to
locked to the uprights by tightening clamping 75 turn the tool spindle and to move the table at
.spindle head has been adjusted to bring the
spindle 25 to the desired vertical position, by
feed rate, the pulley (i3 is selectively connected,
resented by the gears T9 and 80 shown in .Figs. 6,
by means of a clutch it], to a main driving shaft
7-and 12 in the drawings. ‘
'II that extends through the bed to ‘the front of
Since the driving mechanism would be locked,
and injury might possibly result to the machine
if intermeshing pick-off gears should be applied
to both the shaft '81 and the shaft 92 (at the same
the machine.‘
Power for rotating the spindle 26 is taken from
the main shaft 7 I by means of a worm 12, shown
in Figs. 13 and '14, that is fixed on the shaft and
has meshing engagement with a worm wheel ‘13
rotatably supported in the bed 26. The worm
wheel 73 has splined connection with a verti
call'y disposed splined shaft T4 that ‘is journalled
in the spindle head 2? and arranged for vertical
‘movement therewith, the splined connection with
the worm wheel '13 providing a driving connec
tion regardless of the vertical position of the ‘
‘spindle head. The vertical shaft ‘iii delivers power
‘at constant speed to a bevel gear reversing
mechanism 75 in the spindle head 2?, as shown
in Fig.
For effecting reversal in the direction
‘of spindle rotation, ‘the reverser ‘15 may be actus
ated by ‘a shifting arm T6 to provide for cou
pling the vertical shaft "[4 to a horizontal power
‘driven shaft '1'‘! ‘in manner to drive it in either
vdirection for turning the spindle in ‘either direc
ition selectively.
From the horizontal power driven shaft 7"! in
the head ‘21, power is transmitted to drive the
spindle vat a selected rate in either of two speed
‘ranges. 'Whenoperating in the high speed range,
power from the shaft ‘11 is transmitted by a pick
off gear 19 removably ‘fitted on the end of the
shaft, to a complementary pick-01f gear “80 sim
ilarly ?tted von the ‘end of a parallel spindle driv
ing shaft 8! . The shaft 8! is provided within the
time, means are provided for preventing the :ap
plication of a pick-off gear to the shaft 38! when
the intermediate pinion 81 is meshed with the
gear 188 for vdriving the shaft 8|. As shown ‘in
Fig. 8 of the drawings, the shifting fork 89 ‘as
socia‘ted with the ‘pinion 81 is provided with an
actuating rod 55 ‘that extends through the rear
Wall of the head 21 into the pick-off gear com
partment and is provided at its end with an ‘ac
tuating handle s's which is accessible when ‘the
hinged door 813 is open, the arrangement being
such that the handle 96 may be rawn outward
to engage the intermediate drive and vmoved -in
ward‘to disengage the drive. To preventapp‘lica
tion of a pick-off gear to the shaft 81 when ‘the
pinion ‘81"! is engaged with the gear'?t, the shift
ing rod 95 ‘is provided with an interlocking for
interfering member 97 so arranged that it moves
outward into the space otherwise occupied by the
pick-off gear on the shaft 8! when the handle
96 is pulledout to engage the pinion ‘31' with the
gear ‘88, thus preventing a ‘pick-off gear from
being placed on the end of the shafti?i while the
30 intermediate speed reducing mechanism is en
gaged. Furthermore, this interlocking arrange
ment compels disengagement of the intermedi
ate drive when it is desired to operate in the
high speed range with a pick-eff gear on ‘the
spindle head 27 with'a long pinion $2 that meshes 35 shaft 8i. This is desirable even though no pick
with a large gear wheel 83 fixed on the spindle
off gear is applied to theshaft 92, since with the
26 in ‘the rear of the quill 43, the ‘arrangement
spindle driving shaft “8! operating in the ‘fast
being such that the gear wheel 83 may slide along
range, the intermediate shaft 92 would be turned
the pinion“ when the spindle and quill are ad
at excessive speed which would result in undue
justed axially withinthe head 21.
40 wear of the mechanism. In ‘the ‘event that a
As may best be seen by reference to Figs. 6 and
pick-off gear should be applied to the shaft 92
7, the pick-off" gears '59 and ‘80 are mounted on
when operating in the high speed range, and
the rear face of the head 27 and are protected‘ by
meshed with either the pick~oif gear H ‘on the
means of a hinged cover plate or door 34 which
shaft ll or the pick-off gear 359701’! the shaft ti,
may be opened to provide access to the gear re
no harm would be done since, with the pinionitl
‘ceiving ends of the shafts. Alternative sets of
shifted out of mesh, this would result merely 5in
pick-‘off gears arranged to provide a series of
turning the intermediate mechanism idly at mod
spindle speeds, ‘are stored in covered recesses 85
erate speed.
at the rear of the bed, as shown in Fig. 6.
The work supportingtable 2| is ‘driven to re!
ciprocate in cooperating relationship with ‘the
For driving the spindle in ‘the low speed range,
there is provided a speed reducing or range
changing intermediate or back gear mechanism
arranged to transmit power indirectly from the
power driven shaft '11 to the spindle driving shaft
81. As may best be seen in the diagrammatic
View, Fig. 12, ‘the intermediate speed reducing
mechanism includes ‘a shiftable pinion 87 that
may be moved into meshing engagement with a
complementary gear 83 on the spindle driving
shaft “8|, a shifting fork 89 being provided for
this purpose. The pinion 8'! has associated with
it agear wheel 90 which meshes with a long pin
ion 9| ?xed on~an intermediate shaft 92, the ar
rangement being such ‘that the gear 5!! may slide
along the pinion 9i when the pinion 81 is shifted
into‘ or out of meshing engagement with the gear
'88. The intermediate shaft 92 is provided at its
‘end 93 ‘withmeans'f'or receiving a pick-off gear
tool spindle 26, by means of a feed screw iiii
that is rotatably ‘supported from the table ‘in
cooperating relationship with ‘a stationary nut
I02 ?xed in the bed 26. As appears in Figs. 11,
2 and 10, the feed screw iii] is rotatably sup
ported at its ends by anti-friction bearings car
ried in table brackets "33 and lei! depending from
the respective ends of the table 72!. As best
shown in Fig. '2, the table brackets are I?tted
into semi-cylindrical sockets H95 in the lower
surface of the tableends between Ways 1i tit which
‘slide ‘on‘complementary surfaces formed in the
bed 28, the arrangement being such that the
ways extend ‘to the ends of the table and serve
to cover and protect the complementary surfaces
in the bed at all times. As shown in Fig, 1.,the
table brackets are secured ‘to the lower side of
the table by means of cap screws [61.
As best shown in Fig. 11, the Stationary nut ‘H32
adapted‘to mesh with a complementary pick-off
70 is mounted in a plate or bracket H0 that is se
gearon the‘driven shaft Ti. The pair of pick
cured by cap screws Hi to the top of the bed>2?
off ‘gears transmitting power from the driven
between the table receiving bearing surfaces.
shaft ‘11 to the intermediate shaft 92 replace the
The bracket H0 also carries a bevel gear revers~
vpick-01f gear direct driving connection between
ing mechanism H2 arranged to drive the table
‘the shaft 11 and the spindle driving shaft Bl rep 75 ‘screw in either direction selectively. As shown,
of an overrunning clutch mechanism I33*ar
the reversing mechanism includes a sleeve H3
having splined connection with the screw IOI for
rotating it and provided on its periphery with
ranged to permit the shaft I20 to be operatedin
the same direction at rapid traverse rate With
out interference from the feed driving mecha
The serrations on the sleeve II3 are
engaged by internal serrations in a complemen Cl msm.
Power for driving the table 2I at rapid traverse
tary shifting collar H4 provided at its ends with
rate is derived directly from the driving pulley
clutch teeth that may be shifted into engagement
83 independently of the clutch 10, by means. of
with either of two bevel clutch gears H5 and
a gear I35, ?xed on the hub 64 of the pulley and
H6 rotatably mounted in axially spaced bearing
elements secured to the bracket I I0. The clutch 10 meshing with a gear I36 on a rapid traverse shaft
I31 extending forward to the table feed bracket '
gears H5 and H6 are arranged to be driven con
tinuously in opposite directions by means of an
intermeshing bevel gear II‘I journalled in the
I23, the arrangement being such that the table
may be actuated at rapid traverse rate regard- ’
less of whether or not the main clutch ‘I0 is en
bracket III] and having splined connection with '
the splined upper end of a vertically disposed 15 gaged to drive the spindle 2B. As shown, the
shaft I3‘! is splined at its forward end to a hollow
table driving shaft I20. As may be seen by ref
shaft I38 journalled in the bracket I23 and car
erence to Figs. 11 and 15, the table driving screw
rying a spiral gear I39 which meshes with a com
IOI and its associated feed nut and reverse gear
plementary spiral gear I40 ?xed on a clutch hous
driving mechanism on the bracket IIO, may all
be removed from the bed of the machine as a 20 ing IIII mounted concentrically with the ver
tically disposed table driving shaft I20. The
unit. A protecting cover I2I, shown in Fig. 11,
rapid traverse driving mechanism may be con
is secured by screws to the upper surface of the
nected selectively to actuate the table 2I by en
bracket Hi] to protect the table driving mecha
gaging a hydraulically actuated friction clutch
nism from dustor other foreign matter.
In order to remove the table screw ‘and its 25 I42 mounted in the housing I 4|. In changing
from rapid traverse rate back to the predeter
driving mechanism with the bracket III), the‘
mined feed rate of movement, the rapid traverse
clutch I42 is disengaged by releasing hydraulic
table brackets I03 and I 04 are ?rst detached from
the ends of the table by withdrawing the securing
cap screws I07. The table may then be removed
pressure thereon and a synchronizing friction
clutch I43 is forced into engagement by a spring
I44 to quickly reduce the driving speed to that of
the overrunning clutch I33 in the manner‘ set
from the bed by sliding it endwise along the
bearing surfaces, leaving the screw in its orig
inal position. After the table has been removed,
the protecting cover I2I may be detached to ex
forth and claimed in vUnited States Patent No.
pose the cap screws II I.
The cap screws III
By thus arranging the feed and rapid traverse
are then withdrawn and the bracket III] lifted 35
rate selecting clutch mechanism on the vertical
to disengage the bevel gear II‘! from the splined
table driving shaft I20, a direct and positive con
upper end of the shaft I20, whereupon the brack—
nection is afforded from this mechanism to the
et I I0 together with the table screw, end brackets,
table actuating screw IIlI. Furthermore, this
feed nut and reverse gearing may be removed
fromtthe machine as a unit.
The vertical table driving shaft I20 is arranged
to be driven in predetermined direction continu
ously at either a selected feed rate or rapid trav
erse rate, the driving power being applied to the
screw IOI in one or the other direction selectively
in accordance with the position of the shifting
collar IIIL As appears in Figs. 13, 14 and 15, the
' vertical table driving shaft I20 is journalled in a
bracket I23 which also carries the table feed rate
changing and controlling mechanism_ and is
mounted in an opening at the front of the bed
20 for removal therefrom as a unit.
Power for actuating the table at feed rate is
derived from the main shaft ‘II to which it is
transmitted from the motor 5| through the spin
arrangement facilitates disconnecting the driv
ing mechanism for removing the feed bracket
I23 from the machine.
As may be seen by reference to Fig. 13, the
feed bracket I23 may be removed from the ma
chine bed as a unit by ?rst detaching the pulley
bracket 65 from the bed and withdrawing it a
sufficient distance to disengage the splined ends
of the shafts ‘II and I3‘! from the splined cou
pling I24 and the splined hollow shaft I38 re
spectively. The bracket I23 may then be de
tached from the front of the machine bed‘ by
withdrawing the cap screws I46 that retain it,
whereupon the bracket may be lowered within
the bed to disengage the splined vertical shaft
the shaft ‘II is connected by means of a splined
I coupling I24 .to a shaft I25 that is journalled in
I23 from the table driving bevel gear II‘I. This
frees the bracket from all mechanical connection
with the machine structure and upon disconnect
ing an oil suction pipe the bracket and its asso
From the shaft I25, power is
ciated apparatus may be-withdrawn‘forwar'dly
‘transmitted through reduction gearing I26 of
out of the bed 23 to provide access to the entire
table driving and control mechanism for inspec
tion and‘repair.
The rate and direction of power movement of
the table 2| may be controlled manually by ac
tuating a lever I50 pivotally mounted on the
front of the machine as shown in Figs. 1, 2 and
15. The direction of movement of the table 2I
is controlled by swinging the lever I50 to the
right or left, as indicated by the arrows in Fig, 1,
the arrangement being such that the table is
thereby caused to move in the corresponding di
rection. As shown in Fig. 15, the lever I50 is
carried by a pivotally mounted sleeve I5I pro
vided at its inner end with a bevel gear segment
dle controlling clutch ‘III. As shown in Fig. 13,
_ the bracket I23.
?xed ratio to a pick-off gear mechanism I21 ar
ranged at the front of the bracket I23 and made
accessible by opening a hinged door I28. By
.?tting gears of the proper ratio in the pick-off
mechanism, the power may be transmitted at any
desired feed rate to a worm shaft I29, spare gears
for the pick-off mechanism being retained in a
storage compartment closed by another hinged
door I30 at the front of the machine, as shown
in Fig, 1. The feed rate worm shaft I29 is pro
vided with a worm I3| which meshes with a worm
wheel I32 mounted concentric with the vertical
table driving shaft I20, as shown‘in Fig. 15. A
driving connection between the worm wheel I32
and the vertical shaft I20 is effected by means. 75 I52 which meshes with arcomplementary bevel
gear segment I53 ?xed on a Vertically disposed
tripping sleeve I54. The sleeve I54 is provided
shaft I97 in manner to be driven thereby when
ever the pulley 63 is operating. The pump I‘I9
at its other side with a reversed bevel gear seg
ment I 55 which meshes in turn with a comple
draws hydraulic fluid from a sump in the bot
tom of the machine bed. through a conduit I89
and forces it under pressure into a conduit IBI,
mentary segment 555 ?xed on the end of a re
versing shaft ‘I57.
The reversing shaft I51 is
the pressure being limited by a release valve I82
arranged to release pressure above a predeter
mined maximum. The pressure conduit IBI
slidably mounted shifting fork I69 which en
leads to a central pressure port I93 in a pilot
gages a central groove in the reversing collar 10 valve 584 provided with a spring urged valve
H4. The arrangement is such that when the
plunger I85.
lever I59 is in the central Or neutral position
When the clutch lever H1 is swung to the left
shown in Fig. 1, the collar .II'li is in the disen
‘ it turns a control shaft I81 shown in Fig. 14,
gaged position shown in Fig. 11. Movement of
which is provided at its inner end with a cam
the lever to the left causes the collar I I4 to move 15 element £38 that cooperates with one end of a
to the left into engagement with the clutch gear
sliding plunger I89, the cam acting mechanical
H5, which results in driving the table to the left.
ly to move the plunger to the right, asshown in
Conversely, when the lever is moved to the right
Fig. 17, in such manner that its other end en
the collar engages the clutch gear H6 and drives
gages the valve plunger I85 and forces it posi
the table to the right.
tively to the right against the action biasing of a
Control of the rate at which the table moves
spring ‘I99 which normally urges the plunger
is effected by tilting the lever I 50 toward or from
1.85 toward its left position. With the valve
the machine. As shown in Fig. 15, the lever I59
plunger ‘I85 in the right position as shown, a
is pivotally connected to the sleeve I5I in a
cannelure I9I_in the valve plunger £85 estab
manner to permit tilting movement and is ar
lishes communication from the pressure port I83
ranged to engage with its lower end a sliding
to a port I 92 which leads to the right end of a
control rod I6I. The control rod I9I moves in
clutch actuating cylinder I93. Pressure in the
and out in accordance with movement of the
right end of the clutch actuating cylinder ‘I93
lever I59 and turns a bell crank I62 which en
forces a clutch actuating piston I94 to the left
gages and effects vertical movement of a trip
end of the cylinder, thereby ‘uncovering a port
ping pest I64. The lower end of the tripping
‘895 at the middle of the cylinder through which
post IE4 abuts against a plunger I66 of a rate
the pressure ?uid escapes to the lubricating sys
selector I?l and engages a rapid traverse valve
tem of the machine. Fluid in the left end of the
actuator, the arrangement being such that when
cylinder I93 is meanwhile exhausted through a
the lever IE9 is moved forward or away from 35 port I96 which is then in communication through
the machine, the tripping post Iii-I- moves up
another cannelure I 91 of the valve plunger I85,
ward, causing the rapid traverse valve to admit
with an exhaust port I98. When the clutch
pressure to the rapid traverse clutch vmechanism
actuating piston I94 moves to the left, a piston
I42 thereby engaging the clutch and causing the
rod I99 projecting from it moves a shifting fork
table to move at rapid traverse rate.
to! to the left likewise. The fork 201 engages a
As shown in the enlarged view, Fig. 16, the
shifting collar 292 which is connected to actuate
tripping post I 94 is mounted within the trip
the clutch ‘I9, the arrangement being such that
ping sleeve I. 5!; and is provided with a detent
when the collar is moved to the left the clutch is
mechanism I69 arranged to retain it in either its
moved to disengaged position.
upper or lower position. Automatic change in
Upon moving the clutch controlling lever I‘I"I
the rate of movement of the table while the
to the right to its other position, the cam I88 is
machine is in operation, is effected by means of
turned to a position, shown in Fig. 14, in which it
suitable rapid traverse trip dogs mounted in T
releases the mechanical linkage plunger I89 and
slots I "II and I12 in the forward edge of the table
permits the pilot valve plunger I85 to move to the
provided at its inner end with a spur gear seg
ment I58 ‘which meshes with a rack I59 on a
ZI, the arrangement being such that the dogs
left ‘under the influence of its biasing spring I90.
move the tripping post I54 up. or down as they
pass, to change the rate of table movement from
feed to rapid traverse or vice versa. Other trip_
With the plunger I85 in the left position, the
pressure port I83 is placed in communication
through the cannelure I9I with the port I96
ping dogs may be provided to stop movement
leading to the left end of the clutch cylinder I93.
of the table at any predetermined position, these 55 Pressure admitted to the left end of the cylin
stop dogs being arranged to contact wings I14 on
der forces the piston I94 to the right whichin
the tripping sleeve i511- and functioning to turn
turn moves the shifting collar 202 to the right to
it to its central or neutral position, thereby dis
engage the clutch l9. Fluid in the right end of
engaging the reversing collar I!!! from its com
the cylinder I 93 escapes through the port I92
plementary clutch gear.
60 and past the right end of the plunger I 85 into
The main driving clutch ‘M for controlling the
‘an exhaust port I98. With the actuating piston
spindle and the feed rate table driving mecha_
I915 at the right end of the cylinder I93, the lubri
nism is arranged to be actuated hydraulically to
cation port 195 is again uncovered to permit the
connecting position or to disconnecting position
flow of the pressure ?uid into the lubricating
in response to movement of a manually actu
ated clutch controlling lever I‘I'I mounted at the
right front of the machine as shown in Figs. 1
and 2. the clutch being arranged for automatic
hydraulic operation also, in order to provide for
As appears in Fig. '7, the lubricating fluid from
the port I95 is forced upward into the spindle
head 2'? through suitable connecting conduits 203
one of which discharges above an anti-friction
stopping the spindle automatically when the ta 70 hearing 2% mounted in the rear wall of the head
lole is moved at rapid traverse rate. Referring
and serving to support the rearward portion of
now to the hydraulic circuit shown in Fig. 17,
the spindle 2h‘- The spindle is arranged to slide
pressure for actuating the main disconnecting
within the inner race of the hearing 204 when the
clutch "i9 is derived from a gear pump I19 that
quill is is. moved longitudinally, the bearing race
is connected to the end of the rapid traverse
being slidably keyed to the spindle to prevent rel
ative rotation therebetween. 'From the bearing
204 the lubricant drains through a passageway
265 on to a lip 266 from which it ?ows on to the
moves upward in response to a reversing action,
the groove 229 moves out of register with the port
239 thus interrupting communication with the
low pressure relief valve 232. This causes the
pressure in the system to increase to a predeter
mined high pressure suitable for actuating the
reversing mechanism, the pressure then being
limited by a high :pressure relief valve 233 con
nected directly to the pressure conduit 2|9.
When the reversing valve plunger 223 arrives
at its upper position, the pressure port 225 is
placed in communication, through a groove 235
on the valve plunger, with a port 236 from which
the pressure ?uid ?ows through a conduit 231 to
As previously explained, the automatic control
system for regulating the rate and direction of 15 the right end of a reversing motor cylinder 238.
Pressure in the right end of the cylinder 238
movement of the table 2| is mounted on the ta
forces a cooperating reversing piston 239 to the
ble‘ feed'bracket' |23 in manner to be removable
left, the piston in turn exerting force upon an
from the machine with the feed and rapid trav
pick-off gears 86 and 19 to lubricate them. Lu
bricant draining from the pick-off gears ?ows
through a screened opening 231 into the lower
part of the head 21 where it mingles with other
excess lubricant draining from within the head.
The lubricant collecting in the bottom of the
head returns to the sump at the bottom ‘of the
machine bed through a telescoping tube 268 that
constitutes a guard for the vertically disposed
spindle driving shaft 14.
pressure for actuating the table control system is
arm 22! which engages a slot 242 in the piston
239, as shown in Fig. 15. The arm 2M is ?xed on
plunger 223 moves upward, a narrow groove 224
therein moves into register with a pressure port
to rapid traverse position, the poppet valve 256
is depressed and opened. This results in admit
erse driving mechanism as a unit.
the tripping sleeve I54 and the arrangement is
derived from an independent pump 2H] that is
such that when the piston .239 is moved to either
mounted in'the bracket I23 and arranged to be
extreme position, the tripping sleeve is turned
driven continuously by the rapid traverse shaft
to a position in which the shifting clutch collar
I31, as shown in Fig. 13. The pump 2H1 with
draws ?uid from the sump through a conduit 2| | 25 H4 is engaged with one or the other of the re
versing clutch gears H5 or H6 as previously ex- ~
and forces it under pressure through a conduit
plained, thereby providing for movement ‘of the
2|2 to a valve block 243 of’ the control system
table 2| in' the reverse direction. As the piston
that is carried by the bracket I23.
239 moves to the left, ?uid in the left end of the
In order that the table 2| may be operated au
tomatically in accordance with various cycles, 30 cylinder 238, is forced out through a conduit 244
leading to a port 245 that is then in communica
means are provided in the control system for ef
tion through a groove 246 in the valve 223 with an
fecting automatic reversal of table movement to
exhaust port 241.
movement in the opposite direction either at feed
When the piston 239 arrives at its extreme left
rate or at rapid traverse rate. For this purpose,
position, it uncovers a port 25!} through which
automatic reversing plungers 2 | 5 and 2 l 6 are pro
pressure ?uid flows into a conduit 25| leading to
vided at the respective sides of the rapid traverse
a cylinder formed in the lower end of the rate
trip post | 64 in position to be engaged by revers
selector I61 . The pressure in the lower end of the
ing trip dogs on the table. For example, if the
selector I61 is exerted upon a piston 252 formed
table is moving from left to right and a revers
ing trip dog engages the reversing plunger 2|5, 40 on the lower end of the valve plunger I66, forc
ing the plunger and the rapid traverse tripping
it is moved downward into engagement with a
post “it upward to the rapid traverse position.
poppet valve plunger 2|1 thereby opening a re
As appears in Figs. 15, 16 and 1'1, the tripping ‘
verse poppet valve H6 and admitting pressure
post |64 is provided with a groove 253 at its lower
?uid from a pressure conduit 2I9 in the valve
end that engages one end of a rocker arm 254
block 2|3, which is connected to the conduit 2|2
which is pivotally mounted on a pin 255. The
delivering pressure from the ’ pump 2 Ill. The
rocker arm 254 is provided with a cam element
pressure ?uid ?owing through the open poppet
which bears upon the stem of a rapid traverse
valve 2|8 follows a conduit 22| into an actuat
poppet valve 256 shown at the left in the sche
ing cylinder formed in the lower end of a revers
matic diagram, Fig. 1'1, the arrangement being
ing valve 222 and there exerts pressure upon a
such that when the trip post I64 moves upward
valve plunger 223 forcing it upward. When the
225, which is connected by a conduit 226 with the
ting pressure fluid from the pressure conduit 2| 9
pressure conduit 2 I9, thereby admitting pressure 55 through the poppet valve 256 into a conduit 251 '
?uid through the groove 224 into a longitudinal
that leads to a port 258 in the reversing cylin
pasageway 221 in the valve plunger 223 that ex
tends to the lower end of the valve 222. Pressure
?uid admitted through the passageway 221 ex
erts additional pressure on the lower end of the
der 238.
With the reversing piston 239 in the ‘left posi
tion, the port 258 is placed in communication
through a groove 259 in the piston 236, with a
valve plunger 223 tending to move it upward. 60 rapid traverse port 266. From the port 260, a
This pressure is continued upon the plunger
conduit 26| leads to the lower end of the verti
223 even though the reversing poppet valve 2|3
call'y'arranged table driving shaft i2!) which car
may close‘ because of withdrawal of the revers
ries the hydraulically actuated rapid traverse
ing trip dog from the plunger 2|5, the port 225
clutch I42. As appears in Fig. 15, pressure ?uid
being wide enough to maintain the connection
from the conduit 2H flows through a passage
with the passageway 221 until the valve plunger
Way/262 formed longitudinally of the shaft l2!)
223 reaches its upper extreme position.
and thence into a cylinder 263 where it exerts
When‘the reversing valve plunger ‘223 is in the
pressure upon a piston 264 that operates to exert
neutral positionshown in Fig. 1'7, pressure ?uid
upon and engage the rapid traverse friction
from the conduit 226 flows through a rport 228
which is then in communication, through a
groove 229 in the plunger 223, with a port 230
from which a conduit 23! leads to a low pres
sure relief valve 232 that permits the escape of
excessive pressure ?uid. As the plunger 223
clutch H52.
When the rate selector plunger I66 moves up
ward under the in?uence of pressure exerted
through the reversing valve‘ and the reversing
cylinder, its lower end uncovers a port 213 which
establishes communication. from the conduit 2.2|
leading to the lower end. of the reversing valve
through they rapid traverse; poppet valve 256. ?ows
222 and a conduit 271 leading. to the upper end
of the reversing valve.‘ This results in equalizing
the pressures on‘ the ends of the reversing’ valve
plunger 22?; and permits it to return to its cen
tral neutral position under the in?uence of cen
tralizing springs 2'52 at its ends. As soon as the
reversing valve plunger 22% returns to neutral po
sition, communication is Ire-established between 10
the pressure port 228 and the port 23%], thereby
permitting the pressure fluid to escape through
the low pressure relief‘ valve 232, the pressure in
the system thereupon returning to the normal
low pressure, following the reversing operation.
In the event that it is desired to effect move~
ment in the reverse direction at feed rate instead
of simultaneously changing to rapid traverse rate,
a rate controlling valve 215 may be‘ turned, by
means of a control lever 2W5 mounted on the
front of the machine as shown in Fig. 1, to close
the conduit 25! leading from the reversing cylin
d‘er 238 to the lower end of the rate selector l'i'i.
With the valve 215 turned to feed position, com
munication is established from the conduit 251
through a port 2?? which admits pressure ?uid
into the selector it? above the piston 252 and
below a sliding neutralizing sleeve 21%. The
pressure ?uid acting on the sleeve 218 moves it
upward in opposition to a spring 278 and in so
doing uncovers a port ass which establishes an
alternative neutralizing connection between the
lower conduit 22E and the upper conduit 21! lead
ing to the respective ends of the reversing valve
222, thereby permitting the valve to return to
neutral position.
Reversal in the direction of table movement is
accomplished in similar manner when a reversing
through the valve 291.! into a conduit 292v in the
valve block 213. which connects with a single lead
or pipe 293 extending to the main clutch con—
trolling mechanism at. the rear of the machine.
As shown‘, the pipe 28:3 connects with a conduit
294 leading to: the left end of the pilot valve I85
thereby exerting. pressure upon.
piston 295
formed on the valve plunger 135 and forcing the
plunger to the right, against the force of the
spring iiiti, to the position shown. As previously
explained, with. the ‘valve. plunger i525 in. this po
sition, pressure ?uid is admitted from the pump
519 to the clutch actuating cylinder £93 in‘ man
ner to move the main clutch ‘iii: to disengaged
position, thereby stopping the spindle ‘26, the
table 25 continuing to move at rapid traverse rate
meanwl'iile by reason of the. direct driving con
nection from: the pulley $3. to the rapid traverse
The arrangement for controlling the main
clutch by fluid. pressure admitted through a single
hydraulic lead to a pilot valve is broadly claimed
in. the previously mentioned United States Patent
No. 2,215.,?8d. However, in this instance the
clutch is caused to be disengaged upon the exer
tion of pressure through the single control con
duit, whereas in the patent, the control pressure
is; applied to eifect engagement of the clutch.
The advantage of the present arrangement lies
in the fact- that the clutch‘ remains engaged re
gardless of momentary‘ reduction in pressure in
the hydraulic system, such as may result from
utilizing the pressure fluid for other shifting op
erations. Positive operation of the pilot valve to
disengage the clutch is assured by the direct me
chanical connection .from the clutch controlling
lever‘ iii? to the pilot valve plunger.
Vifhenever movement of the table 2! is stopped
trip dog on the table, in moving from right to
left, engages and depresses the other reversing
plunger 2%. This results in opening a reversing
' by disengaging the reversing clutch collar H4
cating with the rapid traverse valve actuating
port 266. This permits the spring led of the rapid
traverse clutch mechanism to disengage the rapid
from the reversing clutch gears, either through
the: operation of the automatic stop dogs upon
poppet valve 283 that admits pressure from the
the tripping sleeve ltd or through manual move
pressure conduit Zlt ‘into a conduit 284 leading
ment of the control: lever: we to neutral position,
to the conduit 2'“ which connects with an. ac
tuating cylinder at the upper end of the revers 45 the reversing piston 2:39 is: likewise moved to cen
tral neutral position. As shown in Fig. 17, when
ing valve 222. This causes the valve plunger 223
the piston 2'39 is in central position, both the
to move downward, again cutting off communica
groove 259' and the groove 28% are moved out of
tion with the low pressure relief valve 232 and
communication with the rapid traverse pressure
establishing communication from the pressure
port 225 through the groove 24$, the port 245 and 50 port 255. At the.v same time a third groove 29?,
which communicates with the longitudinal pas
the conduit 241% with the left end of the revers
sageway Ziil'i, is moved into register with an ex
ing cylinder 233. This moves the reversing pis
haust port 2%: through which pressure ?uid may
ton 239 to the right, thereby shifting the revers
escape from the rapid traverse clutch actuating
ing clutch collar lid to its opposite position and
by way of the conduit 26i and the
simultaneously uncovering a port 285 communi
conduit 25!. When the pressure in the conduit
traverse clutch M2 and to engage the synchro
25!, acting upon the lower end of the rate se
nizing clutch i133 for quickly reducing the speed
lector plunger I65, moves the rapid traverse post
of the table driving mechanism to the predeter
“it upward and causes the rapid traverse poppet
mined feed rate, as set forth and claimed in the
valve 256 to be opened. as previously explained,
previously mentioned United States Patent No.
the pressure. ?uid ?owing through the conduit
25? and the port 258, enters a groove 28% in the
With the reversing piston 239 in either the for
reverse piston 233 which is connected by a longi 65 ward or the reverse position, the rapid traverse
tudinal passageway 23'! with the groove 259 that
drive may be engaged independently of the auto
communicates with the port 259 and the conduit
matic reversing control by opening the rapid
26l leading to the rapid traverse clutch.
traverse poppet valve 25%, either through move
If it is desired to cause the spindle 2a‘ to stop
ment of the rapid traverse trip post 515d by en
rotating when the table 2i is moving at rapid
gagement with a rapid traverse trip dog to move
traverse rate, in order to avoid marring the work,
a spindle stop lever 29% on the front of the ma
chine (Fig. 1) is turned to move a spindle stop
valve 2a: to the position shown in Fig. 17. With
the valve in this position, pressure ?uid admitted
upwardly, or by moving the manually actuated
control lever the outwardly from the machine,
as previously explained. Furthermore, when the
rapid traverse drive is disengaged by movement
of the trip post I64 downward to feed position,
2. In a machine tool, a ‘driving mechanism
including a disconnecting clutch, a ?uid pressure
system arranged to move said clutch alternatively
the pressure is simultaneously relieved from the
clutch controlling conduit 293 to permit the main
clutch to re-engage, unless the pilot valve is re
strained. from movement to clutch engaging po
sition by reason of the clutch lever actuated cam
to connecting position or to disconnecting posi
tion, a valve operatively connected to control
said fluid pressure system, means biasing said
control valve to a position effecting movement
of said clutch to connecting position, ‘fluid pres
I88 being in clutch disengaging position. When‘
the rapid traverse trip post I64 is moved down
to feed position, the rapid traverse poppet valve
256 is permitted to move to closed position under
the in?uence of a spring 299. By reason of a dif
ferential area on the actuating rod of the poppet
sure means selectively operable to force said valve
to a position effecting disconnecting movement
of said clutch, and manually operable control
valve, the rod is caused to move upward away
from the valve ball thereby exposing the lower
end of a longitudinal opening 301 through the
rod, through which the pressure ?uid may escape
means selectively actuatable to move said valve
mechanically to a position effecting disconnect
ing movement of said clutch.
by way of a bleeder port 382.
ber, means to drive said member including a hy
3. In a milling machine having a driven mem
draulically actuated disconnecting clutch, a
At the conclusion of a hydraulic rate or direc
tion changing operation, the excess pressure ?uid
escaping through the low pressure relief valve 232
?ows into a lubricating system for the mechanism
. source of pressure ?uid for actuating said clutch,
a pilot, valve connected to control the ?ow of
?uid from said source to said clutch to actuate
it, means to urge said pilot valve to the posi
carried by the table driving bracket I23.
When it is desired to test the hydraulic con
tion in which it eifects engagement of said clutch,
trol system, the table driving bracket I23 together
pressure ?uid actuated means operative to move
with the entire control valve mechanism may be
said pilot valve to the position in which it e?ects
removed from the machine as previously de 25 disengagement of said clutch, means to control
scribed. A temporary power driving connection
the ?ow of actuating pressure fluid to said pilot
valve, and a single ?uid conduit operatively con
necting said ?ow control means to said pilot valve,
whereby said pilot valve may be moved from
may then be applied to the pump 2 In in manner
to drive it for supplying hydraulic pressure to the
control system during testing and experimental
operation thereof. After'the control system has
been adjusted and tested apart from the machine
clutch engaging position to clutch disengaging
position by impressing pressure upon it through
the entire unit may be replaced in the machine
bed with assurance that it will function correctly
when the machine is put in operation.
From the foregoing detailed explanation of
said single ?uid conduit.
4. In a machine tool, a frame, a working mem
ber movable in opposite directions selectively rel
ative to said frame, power transmission mecha
nism including reversing means operative to ef
fect movement of said member in said opposite
the operation of the exemplifying milling ma
chine herein set forth as a practical embodiment
of the present invention, it will appear that there
directions selectively, a hydraulic motor opera
has been provided an improved machine tool
tively connected to adjust said reversing means,
structure and actuating transmission and con 40 a reversing valve connected to admit pressure
trol mechanism that is especially adapted for
?uid to said motor, hydraulic pressure means
convenient operation and that may be adjusted
operatively connected to shift said reversing
‘ and maintained with facility.
valve, and trip mechanism operative in response
to movement of said working member and func
Although the illustrative embodiment of the
tioning to control said reversing valve shifting
invention has been described in considerable de
tail for the purpose of fully disclosing a practical
hydraulic means, whereby automatic reversal in
the direction of movement of said working mem
operative structure by means of which the in
ber may be effected.
vention may be practiced,'it is to be understood
that the particular apparatus and control sys
5. In a machine tool, a base, a movable ma
tem herein described are intended to be illus 50 chine element slidably mounted on said base,
trative only and that the various novel charac
‘power actuated means operatively connected to
reciprocate said machine element, trip mecha
teristics of the invention may be incorporated
nism mounted in said base in position to be actu
in other structural forms without departing from
ated by said movable element in the course of its
the spirit and scope of the invention as de?ned
reciprocation to control its actuation, and a con
in the subjoined claims.
trol unit removably mounted in said base in
_The principles of the invention having now
position to be actuated by said trip mechanism,
been fully explained in the foregoing written de
said control unit comprising a hydraulically op
scription of an illustrative embodyingmachine,
erated rate and direction changing mechanism
we hereby claim as our invention:
and a ‘pressure pump, said pump being releas
1. In a machine tool, a driving mechanism in 60
ably connected to said power actuated means,
cluding a disconnecting clutch, a fluid pressure
whereby said control unit may be removed in
system arranged to move said clutch alternatively
its entirety from said machine for testing under
to connecting position or to disconnecting posi
pressure developed by driving its pump inde
tion, a valve operatively connected to control
said ?uid pressure system, means biasing said
control valve to a position effecting movement
of said clutch to connecting position, ?uid pres
sure means selectively operable to force said valve
to a position effecting disconnecting movement
of said clutch, control means acting upon said
?uid pressure means for controlling said valve to
thereby effect control of said disconnecting clutch,
and other control means acting mechanically
upon said valvegto move it to a position effecting
disconnecting movement of said clutch.
pendently of said machine.
6. In a milling machine, a base, table receiv
ing ways formed on the surface of said base, a
plate removably secured to said base between said table ways, a nut secured to said plate, a
table driving screw threaded in said nut, table
screw driving means including reversing and dis
' connecting mechanism rotatably mounted in said
plate concentric with and operatively connected
to said screw, the arrangement being such that
75 said screw and its associated nut and driving‘
mechanism. on. said plate may be removed from
or applied to said bed as a unit, a work table
clutch disengaging position selectively in opposi
connected to. control. the flow of pressure liquid
for engaging or disengaging, said clutch selec
tively, means to bias said valve toward the posi
tion resulting in engagementof said clutch, and
table‘ may be fitted to match the ways on said bed
manner that at each end of the path of
tion. to said. resilient means and'independently of
slidably mounted on said table ways for longi
said mechanical valve operating linkage.
tudinal feeding movement, and. bearing means
11. In amilling machine, a.bed‘,.tab1e receiving
attached to the ends. of said table and rotatably 5 ways‘ formed on the surface of. said‘ bed, a work
receiving the ends. of said screw in manner to
supporting table slidably mounted‘ on said ways
transmit feeding movement of said screw to said
for longitudinal movement. therea-long, a. table
driving nut ?xed. in said bed, a table. driving
7. In a milling machine, asupporting structure,
screw threaded in ‘said nut, means in said bed
a movable working element. carried by said sup
operatively connected to turn, said screw in. said
porting structure, a power transmission mecha
nut, and a bearing disposed to rotatably support
nism connected to drive said movable working
each cndof said screw,’ said bearings being. dis
element and. including a. hydraulically actuated
posed beneath. and attached to the respective
disconnecting clutch, a. source of hydraulic pres
ends. of said table and adapted to. pass between
sure for actuating said clutch, a control valve 15 said ways on said bed, whereby the wayson' said
mechanical control linkage operatively arranged
to force said valve positively to clutch disen
travel of said table said ways will coincide with
out either projecting beyond the. other at the
20 trailing end of the table.
gaging position. in opposition to- said biasing force.
porting, table slidably mounted on said, frame,
8. In‘ a milling machine. a‘supporting struc
ture, a movable working‘ element. carried by said
supporting structure, a power transmission mech
anism connected to drive said movable working‘
element and including a hydraulically actuated
disconnecting clutch,ia source of hydraulic pres
means to drive said table including“ a. feed, screw
operatively connected to said table, a driving
bracket associated with said feed screw and re
movably mounted.
mounted in said
threaded uponsaid
anism mounted in
sure for actuating said clutch, a control valve
connected’ to control. the, flow of pressure liquid
screw and said nut, andpowerdrivenmeans in
said. frame having a ‘detachable connection with
said‘ reversing mechanism, whereby after remov
ing said table . from ‘saidyvframe said‘ driving ‘
bracket with said reversing mechanism said‘ nut
moving said valve to clutch disengaging posi
tion, and mechanical control linkage arranged
and said screw may be removed as a unitLfrom
said frame.
to apply force to said. valve in opposition to said
‘ V
, 13. In aimilling machine, a. frame, a,working
biasing force for moving said valve positively
on said. frame; a feed nut
bracket and cooperatively
feed screw, a reversing, mech
said bracket and. operativeiy
connectedto effect relative rotation between said
for engaging or disengaging said clutch selective
ly, means to biassaid valve toward the position
resulting in engagement of. said clutch, control
means arranged to. apply hydraulic pressure to
said valve in opposition to said biasing force for
to. clutch disengaging position.
12. In a milling machine, a frame,‘ a work sup
element slidably mounted on said. frame. a. driv
p 40
ing screw operatively connected to actuate. said
9. In a machine. tool. a movable working ele
working, element, a driving bracket attached to
said frame, a. nut carried by said driving bracket
ment. means for transmitting powertosaidiwork
ing element including a disconnecting: clutch, hy
‘in cooperating threaded relationship with said
draulic actuating mechanism arranged to engage _driv_ing screw, and a power drivenreversing
or disengage said clutch. selectively, a pilot valve. .45. mechanism carried by‘ said
bracket and
operatively connected to. control said clutch. ac-L" operatively connected to e?ect relative. rotation
t‘uatinsr mechanism and having. operating posi
between. said. screw and; said nut, the arrange-7
tions functioning to effect. engagement. and dis
ment being such that .said screw, said. nut and
engagement of said clutch respectively. resilient
said reversing mechanism. may be removed" from
means arranged to bias said‘ valve to one of said,
positions, and mechanical control linkage opera “1
tiveselectively to forcesaidvalve to its other posi
tion in opposition to. said resilient biasing means.
‘ 10. In a machine. tool, a: frame, aworking mem
said. machine as :a unit. with said. driving
‘14. In. a milling. machine, a‘ supporting‘ frame,
a work carrying table slidably mounted. on- said
frame, table actuating. mechanism mounted in
ber movably mounted on said frame, a source of, 55 said frame and operative to-e?ect sliding move
ment of said table, trip mechanism mounted in
mechanism including a hydraulically actuated
frame in associationwith said. table for oper
disconnecting clutch operatively connected to
ation in response to movement thereof, a source
transmit power from said source to said movable
1 of power mounted in said frame for driving said
power for operating. said member, transmission" “
member selectively, a source‘of fluid
pressure for,‘ '60 table, a table driving and controlling unit detach
actuating said clutch. a pilot valve. connected to“?
control the ?ow of pressure ?uid, to said clutch
and movable to two" operating positions corres
ponding to the engaged and disengaged positions ‘
of said clutch respectively, means resiliently urg 65
ing said pilot valve to clutch engaging position,
a manually actuatable clutch controlling lever,
mechanical linkage operatively connecting said
lever to said pilot valve in manner to provide for
ably mounted in said. frame‘ and arranged to
transmit power- from said power source to. said
table actuating mechanism, a power shaft having
splined connection with said driving unit and
operativeiy arranged to transmit power from said
power source to said unit at rapid traverse rate,
another power shaft‘likewise having splined con
nection with said driving unit and operatively ar
ranged to transmit power from said source to said
unit at feed rate, a table driving shaft having
positively moving said valve to clutch disengag
ing position in opposition to said resilient means,
splined connection with said table actuating
a hydraulic control system for said machine tool,
mechanism and connected to transmit power
and a single hydraulic conduit leading from said
from said driving unit to said table actuating
control system to said pilot valve and operative to
mechanism at either rapid traverse or feed rate
exert pressure upon said valve to move it to 75 as determined by the adjustment of said driving
and controlling unit, control means in said unit
arranged to be engaged and actuated by said trip
mechanism to control the operation of said table,
and means releasably retaining said driving and
controlling unit in said frame, the arrangement
being such that said unit may be withdrawn from
said frame upon releasing said retaining means
and withdrawing said splined shafts.
15. In a milling machine, a supporting frame, a
work carrying table slidably mounted on said 10
unit and said table driving unit may be removed
from said frame as a unitary structure for test
ing and servicing.
17. In a milling machine, a frame; a work sup
porting table slidably mounted on said frame,
.a table driving screw, bearings on the ends of said
screw, means detachably securing said bearings
to the respective ends of said table, a table driv
ing unit including a nut disposed to cooperate
with said screw and a driving and reversing
mechanism connected to turn said screw in either
direction selectively, power driven means detach
said frame and operative to effect sliding move
ably connected to actuate said reversing mechan
ment of said table, trip mechanism ‘mounted in
ism, and means detachably securing said table
said frame in association with said table for
operation in response to movement thereof, a 15 driving unit to said frame, whereby said table
driving unit together ‘with said screw and its
source of power mounted in said frame for driv
'bearings may be removed from said frame as a
ing said table, a driving and controlling unit in
‘unit after said table has been removed.
cluding a pressure pump and hydraulic control
18. In a milling machina'a frame, a pair of
mechanism detachably mounted in said frame ,
and interposed between said power source and 20 ways disposed horizontally in spaced relationship
on said frame, a work supporting table having
said table actuating mechanism, a power shaft
frame, table actuating mechanism mounted in '
having splined connection with said driving unit ’ I ispaced ways corresponding to and cooperating
with saidways on said frame and provided at its
V and operatively arranged to transmit power from
ends with sockets between said ways, a rotatable
said power source to said unit at rapid traverse
rate, another power shaft likewise having splined * 25 table driving screw disposed beneath said table
between its ways, bearings on the ends of said
connection with said driving unit and operatively
screw to support it for rotation, and means se
arranged to transmit power from said source to
curing, said bearings in said sockets at the ends
said unit at feed rate, a table driving shaft hav
of said table, the arrangement being‘ such that
ing splined connection with said table actuating
ways'extend the entire length of the
mechanism and connected to transmit power‘ 30,
table in such manner as to overlie and protect
from said driving unit to said table actuating
mechanism at either rapid traverse or, feed rate
I‘ as determined by the adjustment of said driving
and controlling unit, means [in said unit ar-.
all parts of said ways on said frame.
19. In a machine tool having a driven member,
a source of power for driving said member, a
ranged to be engaged and actuated by said trip 35 hydraulically actuated clutch arranged to con‘ nect said source of power tosaid member to drive
mechanism and operative upon said hydraulic
.it,_‘a pilot valve operatively, connected to control
, control mechanism to control the operation of
,said clutch, means biasing said pilot valve, to
saidtable, and means releasably retaining said
clutch engaging position, hydraulic pressure
driving and controlling unit in said frame. the
arrangement being such that said unit may be 40 means, operative selectively to exert force upon
withdrawn from said frame upon releasing said
retaining means and disengaging said splined
, shafts whereupon said unit and its hydraulic con
trol'mechanism may be tested apart from the vma-t
chine under power supplied through a temporary"
16.,In a milling machine comprising a frame, a ,
' working element slidably mounted on said frame.
, drive mechanism arranged to effect movement ofr .
' said element, trip mechanism disposed on said"
frame in position to be actuated by said element
in the course of its movement, a driving and con
‘ said pilotvalve to move it to clutch disengaging
position in opposition to said biasing means,‘ and
a manually operated mechanical linkage opera
Vtive selectively to force said pilot valve posi
tively to clutch disengaging position.
20. In a machine tool, a frame, a working ele
ment movably mounted on said frame, transmis
1 sion mechanism arranged toe?ect movement of
said working element in either direction selec
hydraulic actuating mechanism operatively
to tively,
connected to adjust said transmission mechan
ism, a reversing valve connected to control said
' hydraulic‘ actuating mechanism, an actuating
frame beneath said element, a vertically disposed _ ' cylinder formed at each end of said reversing
valve, a reversing plunger valve connected to each
' shaft carried by said bracket and detachably eon-'3
trolling bracket detachably supported in said
nected with said element driving mechanism, feed
and rapid traverse clutch means on said vertical
of said actuating cylinders, and trip mechanism
arranged to be actuated by said working element
in the course of its movement and operative upon
one or the other of said reversing plunger valves
shaft arranged to drive it selectively at feed rate
or at rapid traverse rate,'~and a hydraulic control
unit mounted in said bracket in position to be" to alternatively to eifect pressure operationof said
reversing valve in manner to cause reversing
operated by said trip mechanism on said frame
‘ and connected to control said feed and rapid
traverse clutch means, the arrangement being
such that said bracket together-with said control
actuation of said transmission mechanism.
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