close

Вход

Забыли?

вход по аккаунту

?

код для вставки
Sept. 24, 1946.
w. K. ANDREW ErAL
2,407,970
WORK INDEXING MECHANICS“
Filed 'April 1s, 1942 >
' 7 sheets-sheet 1
Sept# 24, 1946-
- w. K. ANDREW Ell-AL
2,407,970
WORK INDEXING MECHANISM
Filed April 15, 1942
'7 sheeis-sheet 2
W
NN
W
INVENToRs‘:
<¿ll/IL L lil/’7 KHNDREW
_
ATTORNEY.
Sept. 24; 1946.
w. K. ANDREW ETAL
2,407,970
WORK INDEXING MECHANISM
Filed April 13, 1942
man
wmmx
Nm
7 sheets-sheet 3 .
lik,
»SN
/ /~
INVENTORS:
Sept» 24, 1946.
w.l K. ANDREW _ET AL
2,407,970
WORK -INDEXING' MECHANISM
Filed April 13, 1942
7 Sheets-Sheet 4
V
ww
_
QQ
Sept» 24, 1946.
w. K. ANDREW E'rAL
2,407,970
WORK INDEXING MECHANISM
Filed April 13, 1942
H/
- W5
._ -
7 Sheets-Sheet 5
-Sept. 24, 1946.
‘I
w. K. ANDREWl ET Al.
I
2,407,970 .
WORK INDEXING MECHÀNISM
Filed April l5, 1942
7 Shee‘tsê-Shleet 6
.1.,w..7.
m@
.m „
ww
QQ
s
but
QMS.
Sept 24, 1946.
w. K. ANDREW ETAI.
y
2,407,970
WORK INDEXING MEGHANISM
Filed April 13, 1942
7 Sheèts-Sheet '7
Mmmm» Á
_Vi
INVENTDRS:
WILLIE/'1 K-HNÜRE W
8¢J05EPH J-LENERT.
` A_TTURNEY.
Patented Sept. 24, 1946
2,407,970
UNITED STATES PATENT OFFICE
2,407,970
WGRK INDEXING MECHANISM
William K. Andrew, Wauwatosa, and Joseph J.
Lenert, Milwaukee, Wis., assignors to Kearney
& Trecker Corporation, West Allis, Wis., a co1'
poration of Wisconsin
Application April 13, 1942, Serial No. 438,708
11 Claims.
This invention relates generally to machine
tools, and more particularly to an automatic mill
ing machine that includes a rotatable cutter and
a movable work support embodying means for
effecting the automatic indexing of a workpiece
in timed relationship with the cyclic operation of
the machine.
In order to increase the eñiciency of an auto
matic milling machine through taking full ad
vantage of the teachings of the present invention,
(Cl. 590-21)
2.
improved work holding element adapted to move
with the work support to periodically bring the
workpiece into contact with the rotating cutter
and to index the workpiece on each successive
cycle of machine operation to produce a series of
Yuniformly spaced cuts in the face of the Work
piece to form a gear or the like.
Suitable work
clamping and locking or latching mechanisms
porting spindles mounted in spaced relationship
are provided to releasably retain the workpiece
in indexed position and they operate under the
influence of movement of the index operating
mechanism to Icontrol the sequence of operations
on the movable work support and arranged in a
in a manner to eiîect the automatic release of
the machine is provided with a pair of work sup
manne-l1 to position separate workpieces on dia
metrically opposite sides of a rotatable cutter so
that a cutting operation is performed on one
workpiece while the other workpiece is being
automatically indexed with the result that work
clamping pressure on the Work holding spindle,
the release of the locking mechanism, the index
ing movement oi the workpiece, the reengage
ment of the lock, and the application of clamping
pressure on the work holding spindle in response
is accomplished on each stroke of the operating
to the operation of a control element that is actu
cycle of the machine.
20 ated [by relative movement between the movable
The primary object ci the present invention is
work support and stationary portion of the
to provide a machine tool having a movable Work
machine.
support including new and improved work index
The foregoing and other objects of the inven
ing means arranged to `be actuated from a source
tion, which will become more fully apparent from
of power separate from the machine transmission 25 the following detailed speciñcation, may be
and under control of the movable work support
achieved by means of the particular milling ma
so that the automatic operation of the work in
chine constituting an exemplifying embodiment
dexing means will result in the retention of one
of the invention that is depicted in and described
workpiece in indexed position for contact with
in connection with the accompanying drawings,
the cutter while the other workpiece is being in 30 in which:
dexed preparatory to being brought into contact
Figure 1 is a view in front elevation of a milling
with the cutter on the next succeeding operating
machine provided with work holding elements
stroke of the machine.
capable of automatic operation to index, lock and
Another object is to provide new and improved
clamp workpieces in accordance with the teach
control means operative under the influence of 35 ings of the present invention;
relative movement between a stationary and a
Fig. 2 is a view in horizontal section taken sub
movable member of the machine tool, for con
stantially along the plane of the line 2-2 of Fig.
trolling the application or" power to effect the
i, and showing the relative positioning of the
automatic indexing operation performed upon the
cutting tool and work holding elements that op
workpiece in accordance with the established 40 erate automatically to index, lock and clamp the
cycle of operation of the machine.
workpiece in response to cyclic movement of the
A further object is to provide new and improved
workpiece with respect to the rotating cutter;
hydraulic control and actuating means for effect
Fig. 3 is a fragmentary elevational View of the
ing the coordinated operation of the indexing
mechanism of each of the work holding elements 45 front face of the movable Work supporting ele
ment and shows a set of trip dogs and cooperating
in a manner that results in the indexing of one
elements that are operative to control the direc
workpiece at a position remote from the cutter
tion and rate of movement of the work support
while the other workpiece is effectively locked
ing element;
against movement at a position in the proximity
of the cutter.
Fig. 4 is a view of the work holding clement
50
According to this invention a milling machine
partly in side elevation and partly in axial section
of standard type having a vertically disposed
showing the work holding, indexing and latching
cutter spindle and a work support arranged for
elements;
reciprocating movement toward and from the axis
Fig. 5 is a View in rear elevation of the work
of the cutter spindle is provided with a new and 55 holdin?,r element including the indexing and latch
¿407,970
3
cordance with the adjustment of the trip dogs
and the position of the table with respect to the
ing elements with parts broken away to disclose
structural details;
i
cutter. The manual control of the direction and
Fig. 6 is a fragmentary top plan view of the
movable work supporting element including the
work indexing, clamping and latching elements
rate of table travel movement may be effected by
manipulating a hand lever 39 positioned adja
cent to the spindle control lever 3i) and operable
to control the table transmission (not shown)
with parts broken away to more clearly disclose
structural features of the elements;
Fig. 7 is a View in vertical section taken sub
in a well known manner.
For the purpose of increasing the production
stantially along the plane of the line ‘l-ï of
Fig. 6 and showing a check valve arranged in
the indexing cylinder of the hydraulic operating
and control system;
efñciency of the machine so that a cutting opera
tion is performed on each forward and return
stroke of the table, two work holding fixtures 4l),
,
that are identical save for opposite hand ar
Fig. 8 is a view in perspective of the actuating
rangement, maybe secured to the table 3l in
mechanism for effecting the operation of the
spaced relationship in a manner to alternately
spindle clamping, work indexing, and the latch
ing mechanisms;
.
direct separate workpieces into the path of the
rotating cutter 29 at diametrically opposite sides
_
Fig. 9 is a fragmentary view in elevation of a
thereof. Each fixture includes a base 6I, a body
portion ¿l2 and a hollow work spindle 43. The
anism;
'
Fig. l0 is a view in horizontal section taken 20 base 4l is adapted to be fixedly mounted on the
table 3l by means of T-bolts 44 that are anchored
substantially along the plane of the line lt--lii
in the usual T-slots formed in the upper surface
of Fig. 9 and showing the latch releasing pawl in
of the table. The body portion 42 of the ñxture
elevation, the dot-dash showing of the pawl indi
portion of the work indexing and latching mech
¿il is arranged for adjustable rotatable position
cating its lateral pivotal displacement during the
ing about a vertical axis upon the base 4|. A
centrally disposed circular recess 45 (see Fig. 4)
idle return stroke of the indexing mechanism;
Fig. 1l is a view in side elevation of the con
formed in the base lll serves as a journal to re
trol mechanism arranged on the rear face of the
ceive a trunnion dii formed on the body portion
42 to locate and guide its movement on the base
table and operative at a predetermined point of
table travel to effect the automatic operation of
the clamping, indexing and latching mecha
30
nisms;
Fig. l2 is a view in vertical axial section
el. The body portion 62 is secured in adjusted
angular position on the base 4I by tightening
nuts on T-bolts ¿il that pass through a flange 48
and ride in an annular T-slot 49 formed in the
base lll and arranged concentrically with the re
cess 135. The hollow spindle 43 of the work hold
ing fixture 40 is journalled for rotatable move
through the work holding spindle and showing
a modified form of means for releasably retain
ing a workpiece in the indexable spindle; and
Fig. 13 is a schematic diagram of the hydraulic
control and operating circuits of the machine
ment about a horizontal axis in a pair of tapered
sleeve bushings 52 that are positioned in a hori
and including portions of the clamping, indexing
zontally disposed bore 53 formed inthe body
y
Referring more specifically to the drawings, 40 portion d2. The spindle t3 includes a head 54,
a tapered bearing portion 55, a splined shank 56 '
Figs. l and 2 thereof show the general structure
and a threaded end 5l. The spindle 43 is re
of the automatic milling machine constructed in
ceivable
through the bore 53 to a position in
accordance with the teachings of the present in
which the head 54 lies in the forward end of the
vention that is referred to herein by way of ex
bore 53 and the tapered bearing portion 55 in
ample. As there shown, the machine comprises
and latching mechanisms.
the forward tapered sleeve bushing 52. A sleeve
element Gl provided with a splined central bore
52 is slidably receivable on the splined shank 56
of the spindle 43. The sleeve 6i includes a ta
pered bearing surface 63 for cooperation with
the other tapered bushing 52 to support the rear
ward end of the spindle 43. For the purpose
essentially a bed or base 23, constituting the ina
chine frame and having secured at its rear por
ion an upstanding column 2l arranged to pro
vide suitable guide means for a spindle block 22
from which the usual overarms 23 extend.
An ,
attachment 2li, including a vertical spindle 25, is
supported by the overarms 23 and a suitable
harness or bracket 26 secured to the bed 2t. The
harness 25 is provided with slots 21 adapted to
of eliminating axial lmovement ofthe spindle in
the tapered bushings 52, an adjusting nut 64 is
receive cap screws 2S that serve to provide a ,
rigid anchoring means for the forward ends of
the overarms 23 to maintain the attachment 24
securely in desired position of adjustment. The
spindle 25 carries a cutter 2S that is driven in
the usual manner by a, transmission (not shown)
and under the control of a hand lever 30 posi
receivable on the threaded end 5l of the spin
dle 43. As the nut 6d is tightened, it engages
the end of the sleeve 6i and effects the drawing
in of the spindle 43 to eliminate end play be
tween the spindle and `the spindle supporting
Uil
bearings.
To provide » a means for effecting indexing
tioned on the front of the machine within con
movement of the spindle, a template 65 of suit
venient reach of the operator. A work support
or table 3| is guided for reciprocating movement
toward and from the axis of the cutter 29 in thev
portion 5G of the sleeve element El of the spindle
-usual manner on guide ways (not shown) formed
on the bed 20?. The front face of the table 3l is
provided with T-slots ""5 adapted to slidably re
ceive a plurality of sets of individual trip dogsA
able form and size is receivable on a tapered hub
, 63.
65
53, 3d and 35 that may be secured in desired
position of relative adjustment. The trip dogs
that are shown in Fig. 1 and the set shown more
clearly in Fig. 3 operate -control members 36, 3l
and 3E respectively to effect automatic changes _.
in rate, stop, and reversal of table travel in ac- ’
The indexing template E5 may be releasably
retained on the hub 56 by the application of cap
screws 5l that pass through the template and
are threaded into suitable holes formed'in a lo
cating and backing flange 68 of the sleeve 6i.
The hollow indexable spindle 43 is arranged to
receive a collet ill. As shown in Fig. 4, the
spindle 43 contains an axial bore 1I having an
internally threaded mouth l2 at its forward end,
a shoulder '13, a tapered bearing surface 'lll and
a keyway 15 extending inwardly from the
2,407,970
5
threaded end 51 'of the spindle.
6
The collet "lil
comprises a sleeve element :constructed in two
pieces, a headpiece l5 having an outwardly
flared end with Va taper 'Il matching .that `of the
bearing surface 'I4 of the spindle bore 'Il and
provided with ra plurality of axially arranged ra
dially disposed slots 18 to ldivide the forward
end of Ythe collet 'IU into a plurality of jaws 'l5
and a tailpiece v8f! threadedly receivable in the
headpiece 16 and including an externally
threaded rear'end portion BI having a keyway 82
that is arranged to match the keyway 75 formed
in the spindle bore 1l. A key S3 serves to retain
scale H0 on the head of the screw |05, the Ascrew
may be retracted the desired amount .and the re
versing dog maybe moved into Vabutting relation
ship with the head of the screw .Where another
accurate reading may be made on the scale H0.
By means of the adjusting screw, the reversing
dog may be accurately positioned »and then
anchored to insure table reversal at the exact
`position required to `give the desired `depth of
cut‘in the workpiece.
In .operating themachine, after a workpiece
has .been applied to each of the adapter `elements
'90, and the .several dogs 33, .34 .and 35 have been
the ycollet 'I3 ‘and spindle 43 `in fixed angular re- ,
properly positioned in the lower table T-slotÍ3`2,
lationship. ‘The axial positioning of the collet 15 `the operator may throw the lever 3@ to the posi
’lil within the spindle 43 -is adjustably controlled
tion .shown in dotted lines in Fig. 1 to `engage the
by a nut 84 that is receivable on the threaded end
spindle transmission to rotate the cutterand he
`2H of the tailpiece 8i) `of the collet and engages
may linitiate movement of the table 31| in se
the end 51 of the spindle to -cause the collet 'lll
lec‘ted direction by shifting the lever 39 .either
to »be drawn inwardly to eiïect the closing of the
to the right or left to engage the table transmis
jaws 'I9 to releasably retain an adapter or work
sion. With the cutter rotating and the `talole in
holder -33 in ñxed position in the collet.
motion, one .or the other of the workpieces will
The adapter or work holderfëlll comprises a cy
be brought toward `the cutter. As the `workpiece
lindrical body portion 9i arranged to be gripped
approaches the cutter 29, the trip dog 313 will
between the jaws ‘I9 and includes an extended cy 25 engage .the control member 35 and aotuate it .in
lindrical portion S2 adapted to receive a work
well known manner toengage the table transmis
piece and provided with an axially arranged bore
sion at feed rate of `movement so that the work
t3 with threading for the receipt of Va cap screw
piece will be fed into the path of the rotating
94 that may be manipulated to apply a clamping
cutter at the proper rate of movement.. As the
'pressure upon a C-washer B5 applied to the cap 30 cutter 29 reaches the Vproper depth of out inthe
screw 94 between its head and the workpiece.
workpiece, >one of the `reversing dogs 35 which
For the purpose of maintaining uniformity of
has been previously secured in precise position of
positioning of the succession of workpieces ap
`adjustment actuates the `control .member 38 to
plied to the adapter ‘90, `a locating means is pro
effect reversal in the direction of tab-le travel
vided in the form of a spacer element 9S having .‘
a definite measurement between a work contact
ing face 91 and a shoulder 98 `formed adjacent a
hub 99 that is receivable in a bore Hill of .a plug
itl adapted to be threaded into the mouth 'E2 of
the spindle bore 'III until it seats on the shoulder
13.
For the purpose of regulating the extent of
` rapid traverse movement, feed movement, and
accurately setting the point .of reversal of the
table travel, the several tripping vdogs 33, 34 and i
35 should be secured in proper positions in the
lower T-slot 32 of the table 3l.. Since the opera
tion illustrated in the drawings, that of gear
gashing, requires both uniformity and .accuracy
of successive cuts, precision .means is provided .
for setting the reversing dog .35 .so that .the .extent
of the table travel in either direction will re
main constant and the `depth of >each tooth will
and cause the other workpiece to move toward
the cutter at a rapid traversel rate of movement.
As the second workpiece .approaches the cutter,
the speed of the table travel is Areduced to feed
rate `by the action of >the other trip dog 33 on
‘the control member 36 and .the cutter 29 lengages
the workpiece to effect the `cutting operation to
the depth controlled by the adjustment of the
other reversing dog 35. The stop dogs 34 are
provided >merely .as a safety device and operate,
in the absence .or'failure of the reversing dogs
35, `to disengage the .table transmission to insure
against damage to either the workpiece or the
machine.
The duplex arrangement of the machine, re
sulting from Vthe .provision `of two work spindles
arranged on opposite Vsides of the cutter, provides
a means for effecting a lcutting operation on each
stroke of .the table so that two workpieces are
be identical. The means, chosen for this adjust
acted vupon on each cycle of machine operation.
ment in the present instance, :comprises an ad
I'I‘he completion of the `gear cutting operation in
justing screw |05 having one end thereof
an automatic machine of the type here shown
threaded in an anchor block Itâ that is adapted
requires that each workpiece be accurately in
to be secured in desired position of adjustment
dexed at `one >phase of the cycle and retained
with respect to the reversing dog .35 in the lower
securely in indexed positionduring another phase
T-slot 32 by the tightening of an .anchoring bolt
60 .of the` cycle to permit the cutting operation to
lill. The primary or rough positioning of the re
be `accomplished with the degree of accuracy re
versing dog 35 may be made by positioning the
quired.
rearward edge of the dog with regard to a scale
In order to effect proper indexing of the work
|38 secured in a position of adjustment in the
pieces, separate but identical hydraulically actu
upper T-slot 32 by the application of suitable
ated indexing mechanisms are provided for the
anchoring bolts. With the reversing dog 35
work spindle 43 of each ñxture 40. Each work
anchored in approximately the proper position,
spindle indexing mechanism is actuated by a hy
preferably short of the .position required to give
draulic motor H5 and includes a. spindle clamp
the correct depth to the cut, a test cut may be
ing mechanism and. a spindle latching mecha
made and the depth of tooth measured to indi
. nism. The operation of the work spindle clamp
cate the additional amount of movement required
ing and latching mechanisms is coordinated with
to set the depth of cut accurately. With the ad
the operation of the indexing mechanism in a
justing screw |05 moved into contact with the
manner to insure the release of the ,clamping and
reversing dog 35 and a reading taken »between a
latching .action prior to the indexing operation
reference line |09 on the dog and a calibrated
and the reestablishment of the clamping and
2,407,970
7
8
latching operation upon the completion of the
notches, formed on the template 65, under the
indexing operation.
action of a coil spring |43 that reacts against
the top of the plunger |40 and a cover plate |44
As shown in Fig. 6, each hydraulic motor ||5
that is applied to the body portion V42 ofthe
comprises a cylinder H6, mounted on the body
portion 42 of each fixture 40, and a, piston ||1 C21 fixture. The plunger |40 may be manually raised
to disengage the tooth |42 from locking engage
having a piston rod ||8 guided for reciprocating
ment with the template by the manipulation of
movement in the body portion of the ñxture and
a key |45 that may be inserted through a hole
provided with a rack Vportion IIS.
|40 and into a key slot |41 formed in the plunger
|40, as shown in Fig. 4. Under normal'circum
Each spindle indexing mechanism comprises
am indexing bar |20 guided for reciprocating
movement in a channel |2| and retained therein
by the application of a cover plate |22. Recip
rocating motion is imparted to the indexing bar
|20- by means of a wide faced pinion |23 that
is journalled in the body portion 42 in meshing
engagement with the rack portion I I9 of the pis
stances, however, the release'of the locking en
gagement of the tooth |42 with the template is ‘
15
performed automatically underthe 'action of a
pawl |48 that is pivotally mounted on a pin |49
secured in the indexing bar |20, as shown in Figs.
6, 8 and l0. On the forward, or inactive, stroke
of the indexing bar |20, a cam surface |50 formed
ton rod I I8 and in meshV with a rack portion |24
formed on the indexing bar |20. Movement of
the indexing bar |20 is transmitted to an index
on the pawl |48 contacts a cam surface |5|
in the indexing bar |20, as best shown in Figs.
stroke of the indexing bar |20, the coil spring
urges the pawl to its forward position and as the
formed on the plunger |40 and the contact be
ing pawl |25 that is rockably mounted on a pin 20 tween these two surfaces results in the lateral
displacement of the pawl against the action of a
|20 anchored in a block |21 that is guided for
coil spring |52.l Upon completion of the forward
axial sliding movement in a channel |28 formed
5 and 8.
The block |21 is normally retained in
an extreme position in contact with an end wall 25 return, or active indexing stroke is begun, a cam
surface |53 formed on the pawl engages a cam
|20 of the channel |28 by the action of _a coil
surface | 54 formed on the plunger |40, Fig. 9, and
spring |30 surrounding a guide rod |31, that
causes the plunger to rise thus raising thetooth
lserves to retain the block |21 in the indexing
|42 from locking engagement with the template
bar |20, and disposed between one end of the
channel |28 and the block |21. The pawl |25 30 35. The plunger |40 is retained in elevated posi
tion by Contact with thevpawl |43 throughout `the
is normally urged into contact with a tooth of
indexing stroke of the bar|20 _during which the
the indexing template 05 by means of a coil spring
indexing p-awl |25 has engaged the next succeed
|32 disposed between the block |21 and the free
ing tooth on the template to effect the indexing
end of the pawl |25. The amount of indexing
movement imparted to the work spindle 43 is 35 movement to the work spindle 43. When the
indexing movement is completed the pawl passes
dependent upon the adjustment of the stroke of
out of contact with the plunger |40 and the coil
the piston ||1 and the block |21.
spring urges the plunger downwardly to enga-ge
The adjustment of the stroke of the piston | |1
the tooth |42 with the tooth on the template 05
may be effected by manipulating a set screw |35
to a position wherein it abuts the end of the 40 to lock the same in indexed position. ,
The spindle clamping mechanism, that func
piston rod ||0 in its extreme forward position.
tions to exert a clamping pressure on the work
The desired position of adjustment may be re
spindle 43 to insure the rigid holding of the work
tained by tightening a jam nut |36 to lock the
piece during the cutting operation, is also actu
set screw |35 and thus limit the forward stroke
ated under the control of the indexing mecha
of the piston I I1 and hence the amount of move
nism. The clamping mechanism comprises a
ment imparted to the indexing bar |20 through
clamping bar |00 guided for reciprocating move
partial rotation of the pinion |23. The stroke
ment in the body portion 42 of the ñxture 40. As
of the pawl |25 may be further limited by cut
shown in Figs. 6 and 8, the clamping bar '|00 is
ting down the extent of movement of the block
|21. This may be accomplished by the manipu 50 provided with a rack portieri |0| that meshes
with the lower portion of the wide faced pinion
lation of a set screw |31, the free end of which
|23 in a manner to effect Vits axial displacement
isarranged to pass through a hole |30 formed in
upon rotative movement of the pinion E23. The
the end wall of the indexing bar |20, to a posi
outer or free end of the clamping bar |00 is pro
tion in which it abuts the end of the block |21
to limit the travel of the block |21 and the pawl 55 vided with a transversely disposed slot |52
adapted to receive a pin |03 carriedby an arm
|25 in desired extreme position. When the prop
|04 that is movable to effect the clamping action
er adjustment has been made, a, jam nut |39
on the work spindle 43.’ The clamping actionl is
may be tightened to lock the set screw |31. vThe
obtained through a stud |05 that is anchored in
adjustment of the extent of movement of the
piston ||1 and the pawl |25 provides a simple 60 the body portion 420i the fixture and extends
through an ear |60 thatris an integral part of .
and effective means for adjusting the extent of
the body but that has an end and two sides cut
indexing movement imparted to the work spindle
free from the remainder of the body of the fix
43 through the action of the pawl |25 o-n the
ture. A nut |61 threaded onto the stud |65 is
template 65.
The latching or locking mechanism, that func 65 provided with a serrated peripheral surface
adapted to receive a serrated hole |68 formed
tions to releasably retain the work spindle 43 in
in the arm |64. The serrations on the nut and
indexed position, is also under the control'of the
arm provide a simple and effective means for
indexing mechanism. The latching or locking
adjusting the nut |01 on the stud |65 in a manner
mechanism comprises a plunger |40 guided for
vertical movement in a bearing |4| positioned 7.0 such that the movementof the clamping bar |30,
under the action of the pinionV |23, is sufficient
in the body portion 42 of the ñxture in a manner
to apply adequate> clamping pressure upon the
to overlie a portion of the template E5 and the
forward spindle bearing to effectively retain the
indexing bar |20. The plunger |40 is provided
work spindle 43 against any movement during
with a tooth |42. on its lower end adapted to
engage' any of a series of indexing teeth or 75 the cutting operation. Upon retracting move
2,407,970
through the conduit |93 into the sequence valve
l Si? and through a by-pass valve wd, that isnor
ment of the clamping bar, the pressure is relieved
and the spindle is free to be indexed under the
action of the pawl |25 in the manner previously
described.
The hydraulic system shown. schematically in
Fig. 13 of the accompanying drawings illustrates
mally maintained in closed position by the pres
sure of a light coil spring |95, to the conduit |89
into the right hand cylinder through port |33
and thence through the conduit |31 to the cylin
der |16 in the valve |11 from which it passes to
a conduit E95, by reason of the fact that the
plunger |18 of the valve |11 has been moved to
ciated clamping and latching mechanisms to pro 10 its `other extreme position, and thence to the
sump |1|. In o-rder to permit full travel of each
duce a sequence of operations in accordance with
piston Vl i1 to complete the clamping and indexing
the requirements of the work at hand. The hy
operations, a check valve |91 is built into each
draulic circuit includes a motor driven pump lid
a circuit including valve means adapted to be
controlled in a manner to energize the motors
| i5 to effect movement of the indexing and asso
adapted to receive a supply of ñuid from a sump
51| through a conduit |12. A. motor supply con
duit |13 is provided with a check valve iid opera
tive to prevent back pressure in the circuit and
a pressure relief valve |15 operative to establish
the desired working pressure in the circuit. The
supply conduit |13 delivers fluid under pressure
from the pump H10 to» the central portion of a
cylinder i'it formed in a valve |11 that includes
a movable plunger H8 provided with a central
land- llë and a pair of end lands ißii spaced from
the central land |18 by grooves itil. The plunger
|18 of the valve |11 is maintained in one or the
other extreme position under the influence ci
pressure iiuid delivered from a pilot valve |82.
A conduit |83 that branches from the main pres
sure line |13 leads fluid under pressure to the
pilot valve `| 82, the valve stem of which is actuated
cylinder | I6 as shown. in detail in Fig. '1 and ar
15 ranged to permit the free flow of duid under pres
sure from the conduit |89 to the conduit |81
20
25
30
by an arm idd under the control of an operating
pin |35 mounted on the machine bed 2d as shown
in Fig. 1.1.
The pilot valve |82 serves to direct
the fluid under pressure to one or the other end 35
of the cylinder |16 through the selected one oi
two conduits |86 to force the plunger |18 toward
the far end of the cylinder. With the plunger
|18 in the position shown, fluid under pressure
is directed to the top of the `cylinder H55 of the 40
when. the travel of the piston ||1 has effected
the closing of the port |88. In order to carry
away exhaust fluid from the sequence valves |90
and control valve |11, a conduit Hi84 leads from
each of the valves Iäûand |11 to the sump |1|.
The conduit l 98 from each of the sequence valves
i529 provides assurance that any leakage of fluid
past the valve plunger |9| will be discharged into
the sump |1v| at latmospheric pressure to prevent
a building up of pressure behind the plunger |9|
in excess of the value of that exerted by the
spring i552. The conduit |98 directed irom` the
pilotvalve |32 to the sump |1| provides a passage
for fluid selectively` from either end of the cylin
der lit to permitI the plunger |18 to travel freely
one extreme` position to the other under
the influence of` pressure fluid from the pilot
valve idR. It should `be noted at this point that
the motors l I5 are arranged serially in the circuit
in a manner such that the operation performed
by one motor must be completed before the second
motor is energized. ,tol perform its duty.
`.
The control ofY the pilot valve |32 and the points
in the cycle of table travel at which the valve
|52 is shifted to reverse the flow of fluid to the
cylinder .iid may be adjusted in accordance with
the diameter of the cutter 29 so that the opera
tion of the spindle clamping mechanism. is ef
fected in `the proximity of the cutter but prior
to actual contact between the cutter andiwork
right hand motor H5 through a conduit |81 to
force the piston ||1 downwardly, as shown in
Fig. 13, to effect the clamping ci its associated
work spindle in a manner previously described
to rigidly secure the same in proper indexed 45
position. When the clamping pressure in the
piece. The tripping pin 1&5 that.` is operative to
right hand cylinder H6 has been built up to the
effect the shifting of `the pilot valve |82 is4 carried
required value, fluid under pressure will pass
by a bracket 2,!!! adapted to be secured to the bed
from a port |88, that is uncovered during the
movement of the piston H1, through a conduit 50 2e of the machine, as shown in Fig. 1l, in desired
position
adjustment by cap screws 202 passing
|89 to a seouence valve |88 where it acts upon
through slots M3 arranged to provide a means
a valve plunger |9I to urge it to open position
against the action of pressure regulating spring
|92. With the valve le@ in open position the
fluid under pressure is delivered through a con
duit ist to the lower end of the cylinder lid of
the left hand motor M5 to cause the piston ||1
to move upwardly to effect the indexing move
ment of the work spindle in a manner previously
4for permitting selected positioning of the bracket
29| with respect to thetsize of the cutter utilized
55 on the particular type of workpiece on which
the cuttingoperation is being performed.> The
pin |85 is adapted to Contact one arm of a bifur
`cated `fork 2te on each stroke of the table 3| to
`effect arocking movement of the fork on a pivot
295 that positions it on the rear face ofthe
described.
i
table and carries `it past the pin |85. A connect
When the cutting operation has been com
ing link. ¿dit pivotally mounted on the free end
pleted on the clamped workpiece and the table
the fork Eile and the valve actuating arm IS@
reversal has. been effected by one of the trip dogs
serves to transmit the rocking movement of the
35, the movement of the table will eiïect the trip
ning. of the pilot valve |82 through the operation 65 -forlr ddii to the-stemlof the valve |82 to. eifect its
reversal on each stroke oi the table 3| to thereby
of the pin |35 on the valve actuating arm |84
effect `the automatic operation of the work spindle
to efi’ect reversal of the position of the plunger
indexing and associated clamping` and` locking
|18 to cut off the supply of duid under pressure
mechanisms to produce the results previously
to` the topl or the right hand` cylinder and direct
it through the other conduit |81 to the top of l
the left hand cylinder. As the piston ||1 of the
left hand cylinder moves downwardly to eiïect
the clamping action on the associated work spin
die, the fluid contained in the lower portion of
the cylinder will flow back to the sump |1| 1
described.
.
.
,
,
.
.
A niodiiied formA of adapter or work holder is
shown in Fig. i2 of the accompanying drawings.
While `this forni of work «holder partakes of the
general characteristics of the one previously de
scribed, it has particular advantages in the han
2,407,970
11
.
12
,
, dling of> certain types of workpieces. The modi
ñed form oi’ work holder comprises a Vplug 2li)
having a threaded iiangeZII that is receivable
in the threaded mouth 12in the head 54 of the
hollow spindle 43 and a tapered bearing surface
2I2 adapted to contact the tapered bearing sur
face `'Ml of the spindle to insure its proper loca
tion. The plug 2li) includes a central bore 2l3
adapted to receive the hub 99 of the work locat
ing or spacer element 96 that has a deñnite
measurement between the work contacting face
91 and the shoulder I 0i) that abuts the face of
ment of each work spindle toward and from said
cutter, an indexing and clamping mechanism
operatively associated with each work spindle,
a hydraulic motor for effecting the operation of
each of said mechanisms. a power source for
said motors, and control means operative to en
ergize one of said motors to effect the indexing
movement of its associated work spindle and
. energize the other of said motors to effect the
clamping operation on its associated ' work
spindle.
2. The combination with a machine tool in
the plug 2i Ei. In the present instance, the spacer
element Qt is removably secured to the plug by
cluding a rotatable cutter and a reciprocatable
work support, of a pair of indexable work hold
means of cap screws 2i4. A Work supporting
element or bar 2| 5 includes an enlarged end por
tion 2| 5 that is guided for axial movement in
ing spindlesarranged in spaced relationship `on
said reciprocatable work support at diametrically
' the bore 2|3 of the plug andretained against
alternate movement of each work spindletoward
and from said cutter, an indexingY and clamping,r
mechanism operatively associated with each work
rotary Vmovement by the coaction of a keyway
2l'l formed in the bore 2l3 and a pin ZIB mounted
in the portion ZIE. The forward portion of the
bar 215 passes through the central bore in the
spacer` 96 and extends a suilicient distance be
yond the surface 9'!V to permit the application
opposite sides of said cutter in a manner to effect
zo
spindle, a hydraulic motor for effecting the oper
ation of each of said mechanisms, a power source
for said motors, and control means operative on
each stroke of'said reciprocating work support to
energize one of said motors to effect the indexing
movement of its associated work spindle and
energize the other of said motors to eiîect the
clamping operation on its associated work
of a workpiece over Ythe forward end of the bar.
A groove 2I9 formed adjacent theend of bar 2|5
serves, to receive a-workpiece retaining element
in the form of a C-washer 220. A simple and
spindle.
,
convenient means is provided Afor eiïecting the
ready application or release of clamping pressure 30
3. The combination with a machine tool in
upon the workpiece. A stud 22| anchored in the
cluding a rotatable cutter and a reciprocatable
end portion 216 of the work supporting element
work support, of a pair of indexable work holding
spindles arranged on said reciprocatable work
2l 5 extends rearwardly through theV hollow spin
dle 43 and passes through a central opening
support in a manner tov effect alternatemove
formed in a plug 222 that is receivable into the 35 ment of each Work spindle toward and `from
open end of the spindle and includes a flange
said cutter, an indexing and clamping’mechanism
operatively associated with each work spindle, a
V223 for pressure contact with the end 5'! of the
spindle 43. A nut 224 that is threadedly received
hydraulic motor for eilîecting the operation of
on the stud 22! may be tightened against the
each of said mechanisms, a power Vsource for said
outer surface of the plug 222 to effect a drawing 40 motors, and control means lresponsive to move
ment of said reciprocating work ` support to
inaction on the work supporting element 2I5 to
apply a clamping pressure on the workpiece
energize one of said motors to effect the indexingA
through the action of the C-washer 220. After
movement of its associated work spindle at a
the cutting operations on the workpiece are com
position remote from said cutter and energize
plated’ the mit 224 may be loosened and the "1“ the other of said motors to effect the clamping
operation on its associated work spindle at a posi
C-washer 220 slid out of the groove 219 to permit
tion in the proximity of said cutter. ,_
‘ '
the removal of the ñnished workpiece and the
application of an uncut workpiece.
e. The combination `with a machine tool in
cluding a rotatable cutter and a reciprocatable
From the foregoing detailed description of the
work support, of a pair of indexable work hold
structure and operation of the illustrative em
ing spindles arranged on _said reciprocatable
bodiment or' the present invention, it will be
work support ina manner to eiîect alternate
apparent that a new and improved work index
ing mechanism has been provided that is espe
movement of each work spindle toward and from
cially adapted for eiñcient and convenient Opera- `_ said cutter, an indexing and clamping mechanism
operatively associated with each work spindle,
tion` and that may be adjusted readily to accom
modate a wide variety of workpieces.
a pair of serially connected hydraulic motors each
operatively associated with one of said indexing
Although. the illustrative embodiment of the
, and _clamping mechanisms, a power source for
invention has been `described in considerable de
said motors, and control lneansloperativ’e to en
tailfor the purpose of making a full disclosure
of a practical operative structure by means of 60 ergize one of said motors to eiîect the clamping
operation on its associated work spindle prior to
which the invention may be practiced, it is to be
energizing the other of said motors to eiTect the
understood that various novel features of the
indexing movement of its associated vwork
invention may beincorporated in other structural
spindle.
'
'
forms without departing from the spirit and
5. The combination with >a machine tool in
scope of the invention as defined in the subjoined 65
claims.
.
cluding a rotatable cutter and a reciprocatable
work support, of al pair of indexable work holding
The principles of the invention having now
been fully explained in connection with the fore
' spindles arranged on said reciprocatable work-
going description of the embodying apparatus,
' support in a manner to effect alternate move- `
we hereby claim as our invention:
1. The combination with a machine tool in
cluding a rotatable cutter and a reciprocatable
work support. -of a pair of indexable work hold
ing spindles arranged on said reciprocata-ble work
support in a manner to effect alternate move
70 ment of each work spindle toward and from said
cutter, an indexing and clamping mechanism op
eratively associated with each work spindle, a
pair of serially ’connected hydraulic motors each
operatively associated with one of said indexing '
75 and clamping mechanisms,~ a Vpower Asource for
2,407,970
13
14
said motors, and control means responsive to
movement of said reciprocating work support to
energize one of said motors to effect the clamp
ing operation on its associated Work spindle at
a position in the proximity of said cutter prior
to energizing the other of said motors to effect
the indexing movement of its associated work
spindle at a position remote from said cutter.
carrying spindle, and automatic control means
arranged to effect indexing movement of each
effect reciprocatory movement of said table over
a predetermined course of action adapted to feed
Work pieces on said fixtures into opposite sides
locking means associated with said control means
to eiiect indexing movement of each of said
indexing member.
ñxture when it is at a position remote from said
cutter carrying spindle.
9. In a machine tool, the combination with a
cutter supporting structure, of a work supporting
table slidably mounted for reciprocating move
ment in cooperating relationship With said cutter
supporting structure, a pair of indexing work
6. In a milling machine, a cutter supporting
carrying members mounted in spaced relation
10
spindle, a Work carrying table mounted for
ship on said table in manner to support Work
reciprocatory movement in cooperating relation
pieces for alternate engagement With a cutter
ship with said cutter supporting spindle, a pair
on said cutter supporting structure, control
of indexing fixtures mounted on said table at op
means actuated in response to movement of said
posite sides of said spindle in positions to present
Work pieces to a cutter on said spindle, table 15 table and arranged to effect indexing and lock
ing of said Work carrying members, and inter
driving and controlling mechanism arranged to
and arranged to provide for clamping one of
said indexing members as a prerequisite to un
of a cutter on said spindle alternately, means 20 clamping and indexing movement of the other
l0. In an automatic milling machine having
a frame, a cutter carrying spindle rotatably
Work piece elements to the cutter, means to clamp
mounted on said frame, a Work supporting table
each of said ñxtures for holding its work piece
rigidly in position to be engaged by the cutter, 25 slidably mounted on said frame in cooperating
relationship with said cutter carrying spindle, a
control means responsive to movement of said
pair of indexing Work holding ñxtures carried
table and operative to effect indexing of each
by said table in position to cooperate alternately
fixture when at a position remote from said
With said cutter carrying spindle, means oper
spindle and to effect clamping of each iixture
when at a position adjacent to said spindle, and 30 ating automatically to elîect reciprocating move
ment of said table through a predetermined dis
interlocking means associated With said control
tance, and control means operating in response
means and operative to prevent indexing move
to movement of said table and arranged to lock
ment of either ñxture until after the other ñxture
each indexing ñxture as it approaches said cut
has been clamped.
7. In a machine tool, the combination with a 35 ter carrying spindle and to eiTect indexing move
ment of each fixture when it is at a position
cutter supporting structure, of a Work supporting
ñxtures independently for presenting successive
remote from said spindle.
table slidably mounted for reciprocating move
1l. In an automatic machine tool, the combi
ment in cooperating relationship With said cutter
nation With a frame, a cutter carrying spindle
supporting structure, a pair of indexing Work
carrying members mounted in spaced relation 40 rotatably mounted in said frame, and a Work
ship on said table in manner to support work
pieces for alternate engagement With a cutter on
carrying table movably mounted on said frame
in cooperating relationship with said cutter car
rying spindle, of a pair of Work supporting in
said cutter supporting structure, control means
dexing fixtures mounted on said table at op
arranged to effect indexing and locking of said
Worl: carrying members, and interlocking means 45 posite sides of said spindle, hydraulic actuating
mechanism arranged to operate said indexing
associated With said control means and arranged
fixtures in manner to index and clamp Work
to provide for clamping one of said indexing
pieces in successive positions, Work feeding mech
members as a prerequisite to unclamping and
anism operatively arranged to eiîect automatic
indexing movement of the other indexing
reciprocating
movement of said table, a hydrau
60
member.
.
lically actuated valve arranged to control said
8. In an automatic milling machine having a
indexing and clamping mechanism in manner to
frame, a cutter carrying spindle rotatably
effect alternate indexing and clamping actions
mounted on said frame, a Werl; supporting table
of said pair of indexing fixtures, and a pilot valve
slidably mounted on said frame in cooperating
relationship with said cutter carrying spindle, a 55 arranged to be actuated in response to movement
of said table and operative to effect actuation
pair of indexing Work holding iixtures carried
of said control valve in manner to cause suc
by said table in position to cooperate alternately
cessive alternate indexing and clamping actions
With said cutter carrying spindle, means oper
in coordinated relationship with feeding move
ating automatically to eiîect‘reciprocating move
ment of said table through a predetermined dis 60 ments of said table. WILLIAM
ANDREW.
tance, automatic control means arranged to lock
JOSEPH J. LENERT.
each indexing iixture as it approaches said cutter
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 764 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа