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Патент USA US2105913

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Jan. 18, 1938;
Filed July 17, 1955
11 Sheets-Sheet l
Jan. 18, 1938.
FiledrJuly 17, 1935
I ll ISheets—Sheet 2
Jan. 18, 1938.
Filed July 17, 1935
11 Sheets-Sheet 3
Jan. 18, 1938.
rF.-A. FRrrzscH
Filed July 17, 1935
V11 Sheets-Sheet 4
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Filed ‘July 17, 1935
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'11 Sheets-Sheet
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Q 2,105,913
Filed July ‘17, 1935
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F. AVFRrrzs'cH
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Filed July 17, 1955
ll Sheets-Sheet ll
Patented Jam-1'8. 193.8‘
Frank A. Fritzsch, Cincinnati, Ohio, assignor-to
The Lodge & .Shipiey Machine 'li‘ool Company,
Cincti, Ohio, a corporation of Ohio
Application July 17, 1935. Serial No. 31,855
as cm. (oil. 82-21)
and independent quick traverse drive forv the
My invention relates to a metal cutting ma
carriage and tool slide; and, further, in novel
chine employing a work support and a tool sup
control means for controlling the related actu
port having movement therebetween for the cut
ting operation, and is exemplified as of the lathe . ations between a plurality of the same.
My invention is exempli?ed as employed in a 5
type, wherein the movements of a cutting tool .
so-called automatic lathe in which there are
‘ or cutting tools are automatically controlled for
‘operation selectively or in unison, and wherein carriages and tool slides at the opposite sides-of
the work may be selectively operated upon from the rotating work piece for cutting opposite sides
relatively opposite sides by- cutting tools arranged of the work during the location of the work in
the machine.
10 either singly or in gangs. The term'metal in
The work may be suitably supported between
cludes similar and substitute materials.
It is the object of my invention to provide. a centers or on a face plate or by a suitable ?x
machine, of this character embodying simple , ture or ?xtures and be grasped in suitable man
control and operating means for providing a ' ner so as to'rotate at a desired cutting speed.
15 cycle or cycles of movements of a cutting tool
or cutting tools; further, to control the paths of
relatively movable cutting tools in timed rela
tion to one another; and, further, to provide
non-interfering relations between the controls
20 for the cutting tools at theopposite sides of the
work, and for operating the various mechanisms
in proper sequence and in selected directions and
paths for providing a multitude of cutting cycles.
It is the object of myinvention, furthen'to
25 provide novel electrical control means for various
automatic changes in movement of the cutting
tool or cutting tools; and, further, to provide
novel means for exactitude of the diameters and
shoulders produced on work pieces.
30' My invention consists in novel means for accom
plishing these various objects; further, in provid
ing novel means of placing the movements of the
cutting tool or cutting tools in consonance with the
rotations of the spindle‘ rotating theworkwhile the
35 cutting operation or operations are being per
formed, and of quick traversing the cutting tool
or cutting tools for rapidity of return or idle
movements of the tool or tools; and, further, in
automatically controlling such‘ movements by
40 electrical devices in novel manner.
My invention consists, further, in automatically
placing the cutting tool or tools in train with an
independent electric motor or motors for quick
traverse idle movements of the tool or tools;
The invention will be further r'eadily under be5
stood irom the following description and claims,
and from the drawings, in which latter:
Fig. l is a side elevation of my improved de
vice, partly broken away.
Fig. 2 is a plan view of the same.
Fig. 3 is a cross-section of a detail of carriage
latching means, taken on the line 3—3 of Fig. 1.
Fig. 4 is a cross-section of the same, taken on
the line 6-4 of Fig. l.
' Fig. 5 is a head end elevation of my improved 25
'Fig. 6 is a vertical longitudinal section of a
detail of the driving mechanism from the spindle
to the rear tool actuating means, taken on the
line 6-6'0f Fig. 5.
Fig. '7 is a vertical longitudinal section of a
detail of driving mechanism between the spindle
- and the front tool actuating means, taken on the
line ‘i—l of Fig. 5._ I
Fig. 8 is a. horizontal longitudinal section of a
detail of driving mechanism between the spindle
and the respective tool actuating means, taken
on the line 8--3 of Fig. 5.
Fig. 9 is a vertical longitudinal section of a 40
detail of the same, taken on the line 9-9 of Fig. 8.
Fig. 10 is a vertical longitudinal sectional detail
of the same, taken on the line iil—l0, of Fig. 8.
Fig. 11 is a vertical cross-section, taken on the
line H-H of Fig. 1, partly broken away, showing
45 further, ‘in providing a separate reversible elec
tric motor or motors for such quick traverse
the'related feed and quick traverse driving means
movements; and, further, in providing novel
Fig. 12 is a cross-section, taken in the plane
means for transition between spindle drive for
feed movements of the cutting tool or tools, and
50 quick, rapid traverse drive for the idle move
ments of the cutting tool or cutting tools, and
novel control means for the same.
My invention consists, further, in novel means '
' controlling the relations of carriage and tool slide
55 movements, and in novel related spindle drive
for the front tool support.
of the line i2-—i2 of Fig.715, showing the dwell
mechanism for the end of the feeding movement
of the front tool support.
, Fig. 13 is a ‘cross-section of the same, taken
on the line 93-43 of Fig. 12.
Fig; 14 is a cross-section, taken in the plane
of the line iii-4d of Fig. 15, partly broken away, 55
showing quickwtraverse control switches for the
front tool support.
Fig. 15 is a longitudinal section, taken in the
plane of the irregular line |5-|5 of Fig. v11, partly
broken away, showing the driving and control '
kmechanism in the front control box.
Fig; 16 is a cross-section of a detail of the
same. taken in the plane of the line l5-il of
Fig. 15, showing the reversing control for the
quick traverse motor.
Fig.1’? is a cross~section of the same, taken
in the plane of the line |‘|—|‘| of Fig. 16. .~
Fig. 17a is a perspective view of the clutch
between ‘the nut and the cam sleeve.
Fig. 18 is a cross-section, taken in the plane
of the‘irregular line |2-|2 of Fig. 15, showing
a detail of the control for the dwell and revers
ing mechanism.
111g. 19 is a developed plan view of the driving
20 cam between the respective quick traverse motors
and the operating shafts'for the respective tool
Fig. 20 is a developed plan view of the dwell
cam for control of the‘ ?nal portion of feeding
25 ‘movement of the front tool.
In the present exempli?cation of my invention Q
a piece of work | (Figs. 1 and 2) is supported
between ahead center 2 and a tail center 2. The ._
head center is in a drive spindle 4, having a face -'
plate 5, with which the work rotates, being con
nected therewith by a suitable dog '5. The tail center is in a tail ‘spindle '| slidable endwise in
a bearing 2 in a tail stock I, for attachment
release of the work, as by a handle", having I,
usual rack and pinion connection with the sleeve, 10
the sleeve, being clamped in'the hearing by
clamping means operated by a handle II. =1
‘ The work is operated upon by suitable tools
exempli?ed as a front toolor tools |4 (Figs. 1
and 2) suitably clamped to a front tool slide i5, 15
movable toward and from'the work along guide
ways I‘ of a front carriage l'l, slidable length
wise of the bed ll of the machine on guideways
i2, and by a rear toolor tools 20 suitably clamped
to a rear tool slide 2| movable toward and from 20
the work on guideways 22 of a rear carriage 22,
movable lengthwise of the bed on guideways 24.
The tail stock is also adjustable lengthwis'eof the
bed on these guideways, and is'arranged to be ,7
clamped in adjusted positions by suitable clamp
, Fig._21' is a plan section of the‘ rear control box, ing means. clamped by clamping nuts 25. The
taken on the line 2|-2| of Fig. 5, and ‘partly ' respective tool slides and the carriages form tool
‘broken away.
supports, either individually or collectively. '
Fig. 22 is a vertical cross-section of the rear
80 control box mechanism, taken on the line 22-22
of mg. 2,. and partly broken away.
Fig. 23 is a longitudinal section of the same,
taken in the plane of the line 22-22 of Fig. 22,
and partly broken away.
Fig. 24 is a section in the planeof the line
24-24 of Fig. 22, showing the switch operating
‘ drum for the rear'transverse motor.
Fig. 25 is a cross-section of a detail or the ?uid
brake pump for arresting coasting of the rear tool
40 support at the end of its reverse traverse move
. ment, taken on the line 25—-25 of Fig. 23.
Fig.-26 is an axial section of the ?uid control
valve for the ?uid pump, taken on‘ the line 25-45
of Fig. 21, and partly broken away.
Fig. 27 is a vertical cross-section, taken on the
line 2‘|-21 of Fig. 2, and partly broken away,
showing the front and rear carriages and tool
slides and their mountings.
Fig. 28 is a vertical longitudinal section of front
carriage mechanism, taken in the plane of the
irregular line 22-22 of Fig. 27, and partly broken
Fig. 31 is a horizontal section of the front car
riage. partly broken away, taken in the plane
of the line 2|—.2| of Fig.
» electric motor 22 (Figs. 1, 2 and 5) mounted in~a
compartment 29 in the base 22 of the machine‘
under the head stock 2|. A‘releasable louvre
plate 22 closes the front end of this compartment.
A cross shaft 22 is journaled in the head stock
and has a pulley 24 thereon,‘a belt 25 being re
vceived over this pulley and a pulley 25 on the _
rotor of the motorfor ,driving they cross shaft.
A further cross shaft 22 is lournaled in the
head stock, (Figs. 1, 2 and 5), meshing gears
42, 4| connecting the cross shafts. Another cross
shaft 42 is 'journaled in the head stock, speed
changing gears 42, 44 connecting this cross shaft
with the cross shaft 22. These speed changing
gears may have others of di?'erent gear ratios
substituted therefor for rotating the spindle at
desired speed. A closing plate 45, releasably se
cured to the head stock by bolts 45, holds the
change'gears on their respective shafts. A worm
41 on the cross shaft 42 meshes with a worm 50
wheel 45 ?xed to the spindle for rotating the
Fig. 29 is a detail of the front tool slide clamp,
taken on the line 22-22‘ of Fig. 2.
Fig. 30 is a cross-section of the same, taken
on the line 25-25 of Fig. 2.
spindle 4 is suitably rotated at seé
lectlve speeds, shown accomplished by'a main 30.
Shafts 5|," 52 extend lengthwise of the bed for '
moving the tool supports respectively at the front
and rear of the bed.
Feeding movements are
imparted to these shafts for moving the respec
tive tool supports at various speeds which have
de?nite relations to the speed of rotation of the
head stock spindle or work rotating means, ac
Fig. 32 is a cross-section of the rear carriage, complished by trains of gearing, including speed
taken in the plane of the line 22-22 of Fig. 27, ' change gearing, and operatively connected with 60
g and partly broken away.
the work rotating means for consonance of tool
Mg. 33 is a rear view of the rear carriage, feed with work rotation.
I partly broken away.
Thus the head stock spindle has a gear 52 ?xed
Fig. 34 is a developed plan view of, the rear tool
I slide actuating cam. _
Fig. 35 is a diagrammatic representation of the
thereto, (Figs. 1, 2, 5, 6, '7 and 8), which meshes
with a gear 54 ?xed on a shaft 55 journaled in
the head stock, and having change pinions 52,
controls for the various tool actuations, and the _ 5'! thereon for driving two trains of speed change
electric devices therefor.
gearings 52, 52 for respectively driving a front‘
Figs. 36 to 39 inclusive are diagrammatic rep
"having driving connection with thefront 70
resentations showing tool positions in different 'tool actuating
- paths of a turning cycle; and,
Figs. 40 to 43 inclusive are diagrammatic rep~
resentations showing tool positions in different
paths of a facing cycle.
5| and a rear shaft 2| hav
. ing driving connection with the rear tool actuat
ing shaft 52, for feeding actuations of said shafts
at various speeds. A shear pinlil’ is between
the gearing 52 and the shaft Ill, and a shear pin
' 2,105,918
II’ is between the gearing l0 and the shaft SI
for safety. ‘A 'cover plate 02 releasably secured
sliding movement of the sleeve in the'opposite
direction engages the clutch. A spring I" in a
socket N8 of ‘the lengthwise movable sleeve be?
to the end of the frame by bolts 63 retains said
speed change-gears on their respective shafts.
tween a ?ange I II on the‘ shaft ‘Iland the bottom
' Means are also provided ‘for imparting quick
of said socket tends normally to engage said
traverse movements to said shafts 5i and B2,
and 'for selectively imparting said feeding move
ments and said quick traverse movements, the
Automatic releasing means are provided for the
clutch under the in?uence of the quick traverse
latter in forward as well as reverse direction.
These means are shown located in control boxes
66, 68 respectively at the front and at the rear
of the head end of the machine. The control
boxes are suitably secured as by bolts 01, 68 to
the respective sides of the head stock.
The front shaft 60 is journaled in bearings 89
in the front control box and in a bearing 10 win
the head stock. It has a worm ll thereon, which
meshes with a worm-wheel ‘I2, rotating loosely
on a cross-shaft ‘I3 (Figs. 7 and ll.) journaled'in
20 bearings ‘Id, ‘it in the front control box.
A longitudinally movable sleeve ‘it (Figs. 11
and 15) is on this shaft and has a spiral gear
‘ll thereon, which meshes with a spiral gear l8
on a sleeve ‘I0, which has operative connection
25 with a lengthwise actuating shaft 8%, coupled to
the tool actuating shaft 5i, which is an extension
The rear shaft 69 is iournaled in bearings 85,
82 in the frame of the rear control box and a
30 bearing 83 of the head stock. (Fig. 6). It has
,a worm 8d thereon, which meshes with a worm-'
motor. The automatic releasing means are actu
ated by a preponderance of motion of the quick
traverse motor over the motion imparted by the
feeding train from the spindle. These releasing
means are shown as comprising coacting cam
teeth I2I, I22 (Figs. 11 and 19)‘, respectively on
proximate ends of the lengthwise movable‘ sleeve
and the hub of the gear its...
When motion is to be transmitted from the
feed gearing through the clutch and longitudi
nally movable sleeve, (Figs. 11 and 19') , the quick
traverse motor is inactive, its rotor being rotated
idly by means of the camteeth, andthe gears
I01, I06, without lengthwise movements‘ of the
sleeve ‘I6 to disengage the clutch. .
_ When, however, motion is'transmitted from the
quick traverse motor, positive rotation is im
parted to the gear I08 and the shaft ‘It, in either
directiomwhich causes rotation of the cam teeth
on the gear I00 either at greater speed than the
speed of rotation of the cam teeth on the sleeve
16 imparted by the feed gearing from the spindle, 30
or reverse .to said last-named rotation, resulting
wheel 86 (Figs. 6 and 22), rotatively loose on a in angular movement between the respective cam
cross shaft 86, journaled in bearings Bl, 8B of , teeth, with the result that lengthwise movement
the rear control box.
This shaft has a longi
tudinally movable sleeve 80 thereon, having
thereon a spiral gear 90 meshing with a spiral
gear 911, on a shaft 92, extending lengthwise of
the machine and journaled in bearings 93, 9%
(Fig. 23) of the rear control box. Meshing gears
40 95, 96 are on this shaft and on the tool actuating
. is imparted to the sleeve ‘I6 by a climbing between
the cams, thereby disengaging the clutch H6 and 35.
rotating the sleeve ‘I6 at the speed imparted by
the quick traverse motor in either direction and
unquali?ed by the feed gearing.
There is a slight oifset I23 in the engaging
faces I24,1I25 of the cam teeth.v (Figs. 11 and 40
shaft 52, which is in effect an extension of the
19.) - These engaging faces which coact when the
shaft 92.
quick traverse motor is rotating in forward trav
Each of the shafts ‘I3, 86 has means mounted
thereon, (Figs. 11 and 22), including the respec
45 tive longitudinally movable sleeves ‘I6, 89 for
rendering the spindle drive or the quick traverse
drive e?ective upon the respective actuating
shafts 5t, 52, these means being similar. The
device for actuating the shaft Si is described
50 and that for the shaft 52 has its parts designated
by similar but primed reference numerals.
Separate reversible quick traverse electric mo
tors I05, E02 are provided (Figs. 1, 2, 5, 15 and
erse direction, in which direction of rotation the
gears 72, I08, driven respectively by the feed
gearing and the quick traverse motor, are rotat 45
ing in the same direction, the gear I03, however,
rotating at a greater speed than the gear it.
During such rotations of the gears the engaging
faces act as cams for disengaging the clutch lid,
and the ends of the teeth of the cam on the gear
I00 rest in the offsets 52%, forming a stop to hold
the sleevein longitudinally moved position for
aiding in maintaining release of the clutch lit.
23) for quick traversing the respective front and ' The longitudinal movement of the sleeve 76 is
rear tool supports. They are suitably bolted to
brackets I 03, Illd, respectively secured to the
outer end plates of the respective control boxes.
The rotor of the quick traverse electric motor
I M is secured to a shaft I05 journaied in bear
60 ings I06 of the control box 65 and has a spiral
pinion I01 thereon, which meshes with a spiral
gear I08 ?xed, as by a pin I09, (Fig. 11), to the
The rotor of the rear quick traverse motor I02
(Figs. 22 and 23), is connected with a shaft H0
journaled in bearings Iii of the control box 66
:and having a spiral pinion H2 thereon, which
limited by engagement of its clutch end with the
?ange i I9 while the cam. teeth are still in engage
ment for rotating the sleeve, the sleeve rotating
with the shaft ‘it.
As soon, however, as the quick traverse motor
is deenergized and the gear I 00 ceases to be ro 60
tated thereby, the end wall of this offset, which
is a camlike structure, is released from the tooth
in engagement therewith for reverse lengthwise
movement of the sleeve ‘It and re-engagement
of the clutch IIS by the action of the spring ill. 65
The deenergizing of the quick traverse motor in
forward direction takes place at the end of tie-=
meshes with a spiral gear H3 ?xed, as by a pin I sired quick traverse forward movement of the
tool. It is desired to continue movement of the
lit, to the shaft as.
There are connecting means (Fig. 11) between tool in feeding direction at the end of such quick
the gear 12 and the longitudinally movable sleeve forward traverse. The transition from prepon
‘it shown as a clutch H6 comprising internal derance of quick traverse movement to slower
teeth on the gear 72 and outer peripheral teeth feeding movement of the tool is caused by re
on the slidable sleeve. Lengthwise sliding of the lease vmovement between the engaging faces in
75 sleeve in one direction disengages the clutch, and which the offset I23 is located, resulting in imme
' di '
“He enmem
ent or'the clutch IIt/i'or plac- - ing-the two portions of‘ the screw or actuating
the‘ ieeding inilu'ence oi the
feed gearing-
shalt together in lengthwise and rotative- direc- '
when the ‘quick traverse-motor is rotated in . The cam slide is provided with 'a cam slot IOI,
reversedirection for reverse quick traverse. an and it is movable lengthwise or the carriage in
opposite rotative relation between the coasting . guideways I82 in the carriage (Figs. 27, 28 and
cam teeth (Figall andlQ) takes placeior
_ 81). The lengthwise movement of the cam plate
.moving the sleeve ‘I8 endwise and diseniiallnl the is determined by the limits of movement or
clutch II8. reverse rotation between the' gear Ill - the nut III, which is movable in a recess I88
10 and the gear ‘I! taking place. consequent reverse 01' the carriage between shoulders I“, III at the. 10
quick traverse movement of the tool takes place ends or said recess.
The tool slide is provided with an abutment
in its cycle oi'movements, at the end oi which it
is desired that movement or the tool shall cease, which cooperates with the walls or the cam in
the cycle having been completed.- For insuring
'15 such cessation oi’ movement 01' the tool, re
engagement oi’ the clutch H8 is prevented, by
holding means to hold the connecting meansor
. clutch in released or disengaged relation, as by
providing the opposite engaging laces I28, I21
20 01 the cam teeth Ill, I22 (Figs. 11 and 19) with.
a resting face or land I 28, and driving faces I28,
I88, such land being ‘shown on'one oi the series
- of teeth and such driving faces being shown on
both series of teeth. The land is sumciently wide
the cam plate, shown as a roller I88 oh a stem
I", fixed in a bearing I88 0!. an adjustable block 15
I88. Thev roller is held in rotative relation to
the stem and is held toward the adjustable block
by the head Ill of said stem.
A screw III‘ is journaled in a bearing in
(Figs. 27- and 29) on‘ the tool slide I8 and is held 20
endwise therein‘, and is provided with a knob
I'll by means or which this screw is manually
rotated, suitable graduations being provided for
the‘ setting of the knob. The screw has threaded
to prevent retraction of the sleeve by the spring
encasement in‘ a threaded ~bearing Ill of the 26
adjustable block I88 for adjusting the tool slide
When the quick traverse motor is deenergized lengthwise of its guideway in the carriage.
The tool slide is clamped in adjusted position
while rotating in- reverse direction, the clutch.‘
II8 -, remains in unclutched relation, thereby to the adjustable block by a clamp I18 (Figs. 29
I I1, and forms a latch for the sleeve.
80 stopping all feeding and traversing movements
of the tool.
and 30), movable endwise in a hole I18 in the 80
tool slide and provided with a slot I‘I'I, forming
The shaft ‘I8 is provided with hand operating
means, as by providing it with a polygonal end
a?iip I18, the adjustable block being provided
Ill for receiving, a suitable wrench, employed in
And endwise movable cam bar I80 is movable
, endwise in a bore I8I_ in the tool slide and has 35
as machine setting operations.
with a ledge I18 received in said slot.
Similar means areprovided between the gears
a cam I82 thereon, which coacts with a cam I88
88, II: and the sleeve 88 (Fig. 22), similar parts
being-designated by similar but primed reference
in a recess I84 in the endwise movable clamp I18.
The sleeve ‘I9 (Figs. 11 and 15) ‘has bushings
I34, I38 thereon rotatable therewith, journaled
A'threaded plug I88 is adjustable in a threaded
enlargement I88 0! the bore I 8I forlforcing the
cam bar inwardly for clamping movement or 40
the plug; to clamp the tool slide to the block
in adjusted relation. The threaded plug is ro
in a bore I38 in the control box 68, the bushing
' I34 having a radially extending annular ?ange ~ltated outwardly to release the clamped relation
01’ this clamp.
_ '
I3] thereon received in a rabbet I88 surround
45 ing said bore and shouldered in the bottom of
the rabbet. The sleeve 18 has spline connection
I38 with a nut I40 threaded to the lengthwise
During the time that the nut I 53 is moved 45
lengthwise by the screw in the recess I83 be
tween theabutments I84, I88, (Fig. 28), move
actuating shaft or screw 80. The directionsot
ment takes place of the cam plate and the slot
rotations of the sleeve determine the directions
therein lengthwise of the carriage. ‘The coaction
50 of movements of the tool.
The screw 80 is coupled to its extension 8|
by a coupling “I for endwise rigidity between
between the walls or said cam slot and the roller 50
I88, with the carriage stationary on its ways,
causes movement oi the tool slide toward’ or
the screw and ‘its extension, and for permitting " from the axis of. the work, depending on the
the extension to be rotated with relation to the direction or movement or the cam plate and
the direction or inclination of the slot therein, 55
55 screw. This coupling is exempli?ed as com
prising a cup I42, having threaded connection - and the contour of said s1ot._ In practice, dif
with a head I“ of the screw, being pinned to i'erent cam plates having slots conIorming to the
said head. A collar I48‘ is ?xed'to the end of the work to'be performed, are substituted for one
extension, to form a shoulder I48, against which another in the carriage, and are readily at
the inwardly extending ?ange I48 of the cup is tached to the nut- I53 by removal and reclamp 60
_ clamped by a clamp nut I88 threaded over ‘the ing of the bolts I84, and by removal and replace
threaded inner endIiI oi.’ said extension.
ment oi.'_ the top plate I81 01 the carriage.
The extension 5| has a threaded portion I 82, which is releasably secured to the body of'the
to form an auxiliary screw, rotatable in a nut
.65 I58 (Figs. 27, 28 and 31). The nut 18 ?xed, as‘
by bolts I84. to the lower face ‘of a cam plate
I88.- The extension is rotatable on the screw
"by releasing the clamp nut I88 and locating
‘a suitable turning handle or wrenchover the
70 polygonal outer end I§8 of the, extension. The
extension is rotated to position the carriage
lengthwise of the bed, the carriage being
clamped‘ in adjusted position, to the bed by
clamps I51 (Fig. 1). After adjustment the
75 clamp nut I50 is again clamped for rigidly hold
carriage by bolts I88.
Endwise movement of the screw shaft after 65
engagement of the cam plate with‘ the respective ‘
abutments I84,‘ I88, causes movement 01' the
carriage in either direction lengthwise of the bed.
The screw 80 (Fig. .15) ismovable lengthwise
in bearings I82 in the end plates I93, I84 01’ the 70
control box 88.
Splines I88, I98 are located
between these bearings .and the screw to prevent
rotation of the screw, these splines being received
in slots in said bearings, and in a slot I91 extend
ing lengthwise in the screw..
End thrust means are provided for the nut I40,
comprising a sleeve 20 I, journaled about the outer
20I is connected with the nut I40 for rotating
periphery of the inwardly extending hub 202.of
The groove 2II is formed as a cam groove so
the bearing I 32. The sleeve 20I is held endwise ‘that when such rotative motion is imparted to
with relation to the bearing, (Figs. 12 and 15), as the sleeve 20I the cam will climb with relation to
by means of an end thrust member 203, shown as a the roller 203. for moving the sleeve 20I axially
roller of frusto-conical form provided with a stem oppositely to the direction of axial feeding move
204 rigid therewith and having journal portions
203, 206 and annular ?anges 201, 20k Bearing
v10 rollers 203 are located about said journal por
The ?anges and bearing rollers ,are lo
ment of the screw, thereby qualifying the endwise
feeding movement of the screw and reducing the -
speed of feeding movement of the tool, so that the 10
movement of the tool is the differential between
cated in the bore 2l0 of’ a sleeve 2I I, the wall of -
the opposite axial movements imparted by the
the bore forming the outer bearing or runway for
said bearing rollers. The upper end of the stem
15 is threaded for receiving a nut 2I2 clamped
nut I40 and the sleeve 20I. The cam draws the
against the ?ange 201, the sleeve being located
between the roller 203 and said nut in such man
ner as to permit snug rotation of the roller, its
stem and the nut.
The sleeve 2“ has threaded connection in a
bearing 2I3 therefor in the wall of the control
box and'is rotatable therein for axial adjust
ment of the roller, this sleeve being held in ad
nut endwise opposite to the direction of feeding
travel of the screw with increasing speed, so that 16
at the completion of the feeding movement, the
nut is moved by the cam axially at substantially
the axial feeding speed of the screw, to practical
ly nullify said feeding movement, whereby the
forward feed of the tool diminishes and ceases, 20
enabling the tool to finish the cutting with re
ducing strains, enabling sharp comers and shoul
ders to be turned, avoiding the appearance of
bearing upon the sleeve for clamping the same in
steps in the turned work, and providing a clean
runout for the tool.
The means exempli?ed for axial movement of
adjusted position.
the intermediate sleeve 222, for engaging the
justed positions by means of a set screw 2I4
25 threaded in the wall of said threaded bearing and
The sleeve 20I is provided with a groove 2I5
(Figs. 15 and 20) in which the roller 203 is lo
cated. ‘This groove has slanting side faces form
ing and thrust walls corresponding in form to the
inverted frusto-conical form of the roller. The
roller is endwise adjustable by means of the
threaded connection 2I3, (Fig. 12) for endwise
locating the sleeve 2“ and taking up play and
wear between the coasting faces of the cam and
End thrust ball bearings 2I6, 2" are located
in an inner annular rabbet 2I3 in the sleeve 20I,
40 being located between the bottom of said rabbet
and a cap 2I9 for the end of said rabbet secured
to said sleeve (Fig. 15) . These ball bearings com
prise an intermediate raceway 220, forming an
inwardly extending annular ?ange located in an
outer annular groove of the nut I40, formed by
forming a rabbet in said nut to form one wall of
the groove and a nut 22I threaded over the end of
said nut I40. This construction exempli?es means
for reducing the friction of the end thrust of the
nut I40 during either direction of axial movement
of the screw respectively for forward and reverse
movements of the tool.
It is desired to impart a dwell at the end of the
cutting movement, it being understood that the
present invention is adapted for high speed op
eration employing tools of high speed steel, which
are somewhat brittle. It is desired that the end
of the feeding movement of the tool be at reduced
speed for insuring accuracy and a clean runout at
60 the end of the out. For accomplishing this in
the present exempli?cation longitudinal move
ment is imparted to the nut I40, opposite to the
feeding movement of the tool so as to reduce the
speed of this feed.
An intermediate sleeve 222 has spline connec
tion 223 with the nut I40 and is interposed be
tween the sleeves ‘I9 and 20I about the nut
(Fig. 15). The sleeve 222 and the sleeve 20I are
provided with engaging clutch members to form
70 a clutch 224, shown as internal teeth on the
sleeve 222, and external teeth on the cap 2I9
which is part of the sleeve 20I. These teeth are
normally disengaged. Means are provided, acted
on by one of the feeding parts, for engaging this
clutch. When this clutch is engaged the sleeve
clutch 224 (Figs. 11, 15 and 18) are a ?nger 221
in an annular groove 223 in said sleeve, the ?nger
being ?xed to a rock shaft 229 journaled in the 30
control box 65, and having on it a pinion 230,
which is meshed by a rack 23I, on a collar 232.
The collar is on a reduced end 233 of an axially
movable bar 234. A collar 235 is ?xed to this re
duced extension, a spring 236 being located be 35
tween the collars and moving the collar 232 for
normally holding it against a shoulder 231 on said
bar. The bar is slidable endwise in a bearing 238
in the casing of the control box.
The bar is provided with a rack 24I meshed by 40
the teeth of a segment gear 242, (Figs. 15 and 18) ,
fixed to a shaft 243, rockable in a bearing 244 pro
truding from the end wall of the control box. An
arm 245 is also fixed to this shaft and has on it
a pin 243. An engaging shoe 241 for the pin is 45
secured to a lug 248 on the cup I42, by means
of a screw 243 threaded into said shoe and ex
tending through a slot 250 in said lug for permit
ting adjustment of the shoe lengthwise of the
shaft or extension BI to adjust the moment of 50
actuation of the bar 234. -
The cup I42 is provided with a cam face‘r25l,
arranged to engage the pin when the screw 80
moves in reverse direction, the pin being received
in the slot between said cam face and the cam
end of the shoe 241. The cup is provided with
a further cam face 252, arranged to engage the
pin in forward direction for lifting the pin into
said slot if it should have descended below the 60
apex between the cam faces 25I, 252.
When the screw 30 moves forward or to the
left in Fig. 15, the pin is engaged by the cam
face on .the shoe 241 for rocking the segment
242 and moving the endwise movable bar 234 65
endwise to the right, thereby rocking the pinion
230 and rocking the ?nger 221 for forward move
ment of the intermediate sleeve 222 and conse
quent engagement of the teeth of the clutch 224.
If in such movement the clutch teeth should be 70
in obstructing relation to each other, the spring
236 permits the reduced end 233 to move endwise
in the rack collar 232, the spring moving the rack
collar and the sleeve for engaged relation in the
clutch, as soon as its clutch teeth on the sleeve 75
.222 move opposite the'tooth spaces on the sleeve
A spring pressed ball 263 (Fig. 15) in a bore
in the wall of the control box is arranged to. be
received in a groove 266 in the longitudinally
movable bar for holding said bar in position of
the tool slide, andv has thereon a knurled head
294 for rotating the same, there being a suitable
index. for the knurled head.
disengaged relation of the clutch.
This adjustable block has a dovetail groove 296
extending lengthwise in its upper face in which
the head 296 of a clamp bolt 291 is received. The
clamp bolt extends through a hole 298 in the
The extent of rotative movement of the sleeve
20f for counteracting the feeding movement of
tool slide and has'a clamp nut 299 threaded
thereover for clamping the tool slide to the inter
10. the screw 80 depends on the amount of such re
tracting movement of the screw that it is desired
shall take place. At the end of such retractive
movement the sleeve 20l will have rotated
throughout the desired angle and any portion of
15 the cam groove, preferably a dwell creating por
tion thereof, may be coactive with the roller 203
(Figs. 12, 15 and 20).
Upon cessation of such feeding movement a
reverse movement or traverse takes place for
20 rotating the sleeve 20| in opposite direction-and
replacing the parts in normal position. This re
versing movement is a quick traversemovement.
In order to cushion the consequent quick reverse
rotation of the sleeve 20l, a cushion (Figs. l2, 13,
25 15 and 20) is provided comprising a plunger 258,
having reversely inclined‘contact faces 269 co
acting with the reversely inclined contact faces
260 of a shoe 26l secured in a slot 262 in a wall
263 between the proximate ends of the cam
30 groove. The plunger reciprocates in a shell 264,
threaded into a threaded bore 266, in the casing
mediate block after adjustment. '
and from the axis of the work only are indicated
for performing such operations as facing, groov
ing, cutting off and the like, either complemental
to or independent of the movements of the tool
or tools on the front tool support, although it
is obvious that movements lengthwise of the bed
may also be imparted to the rear tool either in
conjunction with-or independent of the cross 20
movements thereof, and that the mechanism for
feeding and quick traverse of the front tool sup
port and of the rear tool. supportmay be selec
tively duplicated at the front and at the rear of
the machine within the scope of my invention
set forth in the accompanying claims.
In the present exempli?cation the lead of the
cam drum 219 is such as to cause performance of
the cutting operations of the rear tool or tools
during performance of the cutting operation of 30
of the control box. A spring 266 has one end
thereof located in a bore 261 of‘ said cushion
the front tool or tools. Quick traverse move
ments may be imparted to the rear tool or tools
either in forward direction or reverse direction,
plunger, the other end of the spring being seated
with intermediate feeding movements, as by im
Q: UI. in a plug 268, threaded into the outer end of the
parting rapid rotations to the rear lengthwise
shell 264. A locating screw 269 is threaded into
a threaded hole in the casing, its inner end being
received in a slot 210 in said shell and in a slot
21l in said. plunger for locating the cam faces
40 259 in proper direction for coaction with the
shaft and its extension in forward or reverse di
rections by means of the rear quick traverse elec
tric motor I02, or feeding rotations may be im
cam- faces 260.
parted to said lengthwise shaft and extension by
means of the speed change train of gearing 69, 40
which have rotations imparted thereto in con
The retracting rotation of the cam sleeve 20f
is a quick traverse movement and at the end
thereof the shoe 26l strikes the plunger 268 for
45 reducing its speed. The plunger acts as a
ward movement and extreme outward movement
cushion. The shoe passes under the plunger and
of the tool'slide, as by reducing the lead of the
becomes located between the plunger and the
roller 203 for holding the cam sleeve 20l in nor
mal position against any rotative urge which
cam in the cam drum at each end thereof, (Fig.
50 might be imparted thereto by the rotation of
sonance with the rotations of the head spindle
or driving shaft for the work.
- A dwell is provided for the‘ end of extreme in
34), as by the dwell portions 30L 302 thereof,
which terminate substantially perpendicular to
the axis of the drum. This provides for clean
adjacent parts about the axis of the screw 80.
The shaft extension 52 (Figs. 2, 27, 32 and 33)
,is journaled in bearings 216 of the rear carriage
runout of the tool and the cutting of accurate
corners and shoulders and prevents steps from
23 and has a worm 216 splined thereto by a
55 spline connection 211. This worm meshes with
end of the feeding movement of the tool, and for
smooth and easy transitions from one direction of
movement or control to another in the operation
a worm wheel 218 on a cam drum 219 ?xed to
a shaft 280 journaled in bearings 2", 292 in said
The rear carriage is moved into desired posi
60 tion lengthwise of the rear guideways 24, as by
shifting the
same manually thereon.
It is
clamped in desired adjusted position by clamps
In the ' present exempliflcation feeding and
quick traverse movements'of the rear tool toward
being perceptible in turning operations at the
of the rear tool support.
Braking means are also provided for the rear
tool support to avoid overrunning of the tool, ef
fective at the end of tool movement in any selec
tive direction.
In the present exempli?cation this braking
283, for locating the path of the crosswise move
means is exempli?ed as comprising a fluid pump I
ment of the rear tool slide 2!.
305, (Figs. 22, 23, 25 and 26) for ?uid, such as oil,
embracing meshing gears 306, 301 fixed-to shafts 65
308, 309, journaled in bearings in the rear control
box. The shaft 300 is rotated by the shaft “0
The cam drum 219 is provided with a cam slot
‘285, into which a roller 286 journaled about a
stem 281, secured in a bearing 288 ‘of an adjust
able block 289, is received. This roller is held
toward the adjustable block by the head 290 of
70 said stem.
The adjustable block is adjustable in the tool
slide by means of a threaded rod‘ 29l, (Figs. 2,
-27 and 32), which has threaded connection in
a threaded bore 292 of said adjusting block, and
75 is rotatable and held endwise in a bearing 293 in
and coupled thereto by a coupling 3I0. The
meshing portions of the gears rotate in a pas
sage 3l l, the respective ends of which have ?uid '
conduits 3l2, 313 connected therewith, the other
of the ends of these ?uid conduits having con
nections with passages 3 l4, 3 i 6 in the body of the
control box. There is a check valve 3| 6 between
said passages, shown as a ball, spring-pressed 75
lengthwise of‘ the bed during lengthwise move-7
by a spring 3I1 to normally seat on its seat be
tween said passages. A threaded plug 3I6 closes
the end of the bore in which said spring is lo
men of the‘ cam plate I55, in the carriage. This '
difference maybe increased by drawing up on the .
cated. A cross-passage 3I9 communicates with clamp bolts 356 acting on the guideway plate 351 the passage 3I5, the outer end of this passage of the carriage for insuring preponderance of
being closed by a. threaded plug 323.
‘ I
A sleeve 32I (Fig. 26) has a bore 322 provided
.with an enlargement 323, forming a shoulder 324.
The sleeve is secured in a bore 325 in the body of
10 the control box. Said bore has an annular shoul
der 326 at one end of said sleeve.’ The enlarged
bore of said sleeve is provided with} a threaded
cross slide movement. If desired, means may be,
provided for, latching the cam plate I55 selecg
tively to the carriage and latching the carriage
selectively tolthe bed.
. ‘These means are exemplified as an‘ upright rock,
shaft‘ 358 (Figs. 1, 3, 4, 27, and 31) Journaled in
a bearing 359 in the carriage. This rock shaft at
outer end in which a headed plug 321 is threaded ' its upper'end has a‘latch 368 at one side of its
for clamping the sleeve in longitudinal direction
in its bore so as to prevent leakage of fluid past
said sleeve.
The outer periphery of said sleeve is provided
with annular grooves 33I, 332, from which holes
333, 333 radiate into the inner bore 323 of said
20 sleeve.
A piston 335 is reciprocable in the bore in the
axis and a clearance space 36I at the other side
of its axis; ‘At its lower end the rock shaft has
a clearance space 362 at said one side of its axis
and a latch 363 and a'cam contact face 364 one
above the otheniatsaid other side of its axis.
The upper end of the rock shaft is-also provided
with an arm‘ 365 rigid therewith, whichhas a .20
toe 368 at said one side of its axis and a heel '
361 at said other side of its axis, at the side of
of its ends,‘ arranged to contact the shoulder 335i which latter there is a contact face 368.
A contact plate 369 and a keeper plate 318 p \
toward which such piston is resiliently pressed
25 by a spring 331 between said piston and the plug are secured in desired relation to each other on 25
321. This piston is provided ‘with anannular the lower face of the cam plate I55. respective
groove 338 with which theradiating holes 333, ' ly by bolts 311, 312, the heads of which are
334 normally communicate when the piston is in countersunk in-said respective plates 369, 310, the
sleeve and is provided with a head 336 at one
normal position.
bolts being respectively threaded in threaded
The piston is arranged to be moved lengthwise
holes 313, 314 in the cam-plate in desired relation 30
for closing the radiating holes 333 and stopping ' to the cam slot in said cam plate I55 and for de- ’
flow from the ?uid conduit 3'I3 into the valve by
reason of the stoppage of said holes and the pres
ence of the check valve 316. This occurs at the
end of reverse quick traverse rotation of the quick
sired coaction respectively with said toe 366’ and
the latch 366. The contact plate 369 is thicker
than the keeper plate 318 so as to reach the arm
365; the keeper plate 313, the clearance space 36I
traverse motor I32, to determine the correct posi - and latch 363 being above they level of said arm.
tions of the mechanisms and of the rear tool or
tools at the end of their cycles of movements,
whereby to position the parts ready for actua
tions at the beginning of the next cyclenfor in
A plunger 315 reciprocates in a bore 316 of the .
carriage and engages the heel 361.. ‘It is/spring ‘
pressed towards the heel by a spring 311 in a
bore in the outer end of the plunger, resisted 40
1 stance, after cessation of cutting movements of, by a plug 318 threaded in the outer end of the
the rear tool or tools, for removal of the work bore 318. The spring and plunger normally urge ‘
and the placing of a new piece of work in the' the rock shaft 358 in clockwise direction looking
The actuation of the piston 335 is obtained by
means of an actuating arm 34I (Figs. 21, 22, 24
and 26) ?xed to a shaft 342, journaled in a bear
ing 343, 344 of the control box. This arm car
"ries an adjusting bolt 345 arranged to beqad
justed in the arm for adjusting the moment of
actuation of the piston. The shaft has an oper
< ated arm 346 thereon.
The shaft 92 (Figs. 21, 22, 23 and 24) has a
worm 341 thereon‘, which meshes with a worm
wheel 348 ,?xed to a shaft 349, journaled in bear
ings350, 35I in .the control box 66. This shaft has,
fixed‘ thereto a tappet wheel 352, which has
thereon a tappet 353, shown as a block adjustable
along a peripheral rib 354 on said wheel and fixed
to said wheel in adjusted position by means of a
set bolt 355. This tappet is arranged to strike
at the top of the rock shaft, the contact face
368 limiting rotation of the rock shaft.
‘A camtslide 38I has acam plate 382 releasably
secured thereto by screws 363. (Figs. 1, 4, and
27). . This cam plate hasa cam face 384 there
on. This slide is adjustable lengthwise of the bed -
along ‘a guideway 385, along which an undercut 50
slot 386 is formed in the bed. The heads of bolts
381 are located in this slot, the bolts extending
through the cam slide, nuts 388 clamping the
slide in adjusted position to the bed.
A keeper plate 389 has a keeper face 390 there- .
on. This keeper plate is adjustable lengthwise
on the cam slide vand is securedin adjusted positions thereon’ by clamp bolts 39I passing through
slots 392 in the keeper plate and threaded into
_ the cam slide. The cam'slide and keeper plate
are adjustable lengthwise of the bed and are'ar
ranged to be clamped in adjusted positions re
lated to the desired coaction with the latch and’
the arm 346 at the appropriate mbment for
actuationof the arm 34'I, in order, to move the. .cam contacting face on the lower end of the rock
.65 piston 335 into obstructing position, for braking shaft according to desired coactions between the 65
the actuated parts of the rear mechanism at the parts at the upper end of the rock shaft and the
end of reverse traverse movement thereof. The parts on the cam plate I 55.
arm 346 is arranged to ride on the outer periph
The latch 360 coacts with a keeper face 393 on
ery of this tappet until completion of the braking I ‘the keeper plate 318 for latching the cam plate ‘
I55 with its ,nut I53 engaging the stop I65'for 70
The weight and friction of the carriage on the
bed is greater than the weight and friction of
the tool slide on the carriage, so that cross move
ment of the tool slide on the. carriage is more
is ready
than sliding movement of the carriage
obtaining combined movements of the carriage
and tool slide lengthwise of the bed in certain
operations. (Figs. 1, 3, 4, 2'7, and 31). This latch I
isr'disengaged by coaction between the cam con
tacting face 364 and the cm 384.
1. 2,105,018 '
_ ‘ . The
393 is released by contact of the nose
m on the contact plate as with ‘the toe us‘on
thearm 395, in order to permit, lengthwise move
.comprisinga control switch 492 in the reversing
circuit of the front quick traverse motor III and '
a control switch 493 in the main motor control
circuit. These switches are reversely actuated‘
. ment of the carriage in feedingdirection.
_--~1_e=. the slide m and the plate thereon 811mm‘ for closing the reversing controlswitch for the
1 be‘lf'ih" obstructing relation with the faces at the .qui‘ck traverse motor I_9I and opening the con- ‘
' .ilower/end of the rock shaft during movement of trol switchin the ‘main motor circuit'at the'end
." the-carriage toward the tail stock with the slide of the feeding movement of the cutting tool and
-‘38I between ,said upright shaft and the tail stock, _ ‘actuated-by an element concerned'in such feed
‘said faces on the lower end of the upright rock
shaft will ride upon-the obstructing faces on the
cam slide 39I and the keeper plate thereon, re-'
.s'ilie‘ntly rocking. said upright shaft against the
‘resistance [of the spring-pressed plunger 315,.
‘which ‘immediately returns therock' to normal
‘rocked positi‘onas soonas it has passed the ob
. structing faces on said cam slide.
‘ '
lThe cam sli‘de "I and the keeper‘plate 399
ing- movement, which is exempli?ed as the cam‘
sleeve 29I.
A shoe 494 is located in an_annular groove 495
in said- cam sleeve and moves "the shoe with the
axial movement. of the cam sleeve. This shoe is
,on anarm 4Ii5,v fixed to a rock shaft 491, Jour 15
naled in a bearing 493, stationary on the control
box, and having an arm 499. ?xed thereto. This
arm is provided with a fork 4I9, arranged to co
may be adjusted lengthwise-of the bed for de- _ act with pins ‘4| I on a plunger “2 provided with
_' .. 20
sired coactions with the latch and cam contact‘ a head.4I3, arranged to contact the button 4“
ingv face at the lower end of the rock shaft, or for operating the vdouble poleswitch “I (Fig. 17) . ‘
lack of such coactions, as may be respectively de . comprising the control switches 492, 493, (Fig. 35)
sired ‘for various operations upon the work, in Just mentioned. ' '
some of which the keeper plate 319 on the cam
Before such actuationi'and while the operating
slide I55 is inactive.
" - arm is in position shown in Fig; 17, the switch 493
' when forward traverse‘ movement of- the tool , for the main motor-circuit is closed and the
slide toward the work is to take place, the roller
switch 492 for the reversing circuit of the front
‘ I56 is initially in the outer end of the cam slot
traversing mlotor is-open, the plunger being held
IN inthe cam plate I55. (See Figs. 3, 31, and 36
30 to 39 inclusive.) This‘ cam slot slants from the
inner edge of said cani\plate toward the outer
in this relation by means of a latch “.5, shown
in the form 'of -a bell-crank lever, and arranged‘
to engage‘ 'the head 4 I3 of the plunger for holding
_ vedge and, head end thereof across the longi-‘ said control switches in the relations last stated: 5
tudinal median line of said cam plate. The nut‘. until actuation of the cam sleeve 29I for moving ‘
I53, ‘the contact plate 399, _and the keeper plate
319 are on the under face of said cam plate I55
said sleeve endwise at the ?nal portion .of the I feeding movement of, the tool.
When‘ this endwise m‘ovement takes place the
forward of said median line. '
. In certain classes of work- it is desired that
arm 499 is moved for releasing the latch “5, this '
there‘ be a feeding movement oiLthe tool slide in
operating arm being provided with a ‘contact rod
- a direction away from the axis of the centers‘of \ 4 [.5 shown in the form of a threaded rod adjusted
40 the lathe. In such cases the cam plate I55 is - lengthwise in a threaded bearing 4I.'I of said arm 40'
reversed on its longitudinal axis so that its cam ' and held in adjusted position by a jam nut 413.
‘ slot I9I 'slants from its outeredge inwardly to
This contact'rod-is arranged to engage the‘ ‘lever
ward the head end ‘of the’ lathe, as exempli?ed
latch “5, which is normally springepressed into
in Figs. 40 to 43 inclusive. . .
engaging relation with ‘the ,head ,4I3 by ‘a
when such relation of the cam plate is desired,
"the bolts I54 which pass-through holes 395 in
the cam plate I55 andhold‘it to the nut I53 (Fig.
spring 4I9.-
-\ ,The tripping of this lever releases the plunger‘ - -
M2, which releases-the {button 4“, normally' 28) > are unscrewed, and the bolts 3'“, 312 (Fig‘sJ spring-pressed outwardly by a spring 429 for
'3 and 31,) respectively threaded in the holes 313, opening the control switch'493 in the main motor .
50 314 in the cam plate I55 for clamping the con > circuit and closing the switch 492 in the reversing
tact plate 359 and the keeper ‘plate 319 to the.
\ under face of the cam plate I55, are unscrewed,
circuit of the quick traverse motor I9I vand plac
ing the screw 89 under‘ the operative in?uence of
and such nut‘and plates are fastened to the op-‘ the quick traverse motor IIII operating in reverse, '
direction for reversely quick traversing the tool.
Return of the cam sleeve 29I to normal .posi
Ul Cir side of the longitudinal median line thereof, the
bolts I54 passing through holes 395', the bolts tion, which takes place immediately after its ac
3'“ being screwed into threaded holes 313', and tuation at the end" of feeding movement of the .
the bolts '3" - being screwed into threaded tool, returns the arm 499 to normal position for
holes 314'.
moving. the ‘plunger “2 ‘in reverse direction and
60 .Such various contacts and changes in relation again‘engaging ‘the latch “5, it being understood
of the latches, keepers and came take place .sub-' that these control switches control relay switches,
stantially at the initiations of changes in speeds to be hereinafter described.
and directions of tool movement. such changes in ‘ A switch operating arm 42I (Figs; 14', .15 and
speeds and directions of movement lengthwise of 35)‘ is ?xedto a rock shaft 422, journaled-in a
posite face of said cam plate and at the opposite .
65 the bed and selectively toward or from the work
bearing 423, extending from the supporting frame
being determined by the electric control means of the front quick traverse motor, and having
to-be now described.
.. -
Electrical control is provided for controlling the
feeding movements. and the quick traversing
thereon a cam head 424 for'engaging rollers 425,
429 respectively on ,an_ operating arm 42'! of 'a
double acting single pole snap control switch 429
70 movements in forward and reverse directions of v arranged, when open, to open the forward circuit 70
the operating shafts extending lengthwise of the of the front quick traverse motor I9I.
It is assumed that all control and relay circuits
‘bed and connecting with the tool supports, and,
the moments of initiations of said movements. ‘ ‘are normally open circuits, and this‘description
Referring now to the front shaft, there is a refers'to the switches being open or closed ac
75 double pole switch 49I (Figs. 15, 16, 17 and 35),
cordingly, although~ it is‘ obvious that thecircuits 75v -
. groupie _
may be normally closed- circuits,-in which
'opcmand closed conditions of the control and
' relay switches would be reversed, and that other
changes in electric devices, and circuits may be
made, without departing from the spirit of my
forward" traverse circuits ‘of - the front I-quick. .-
traverse motor I 0! and- of the 'rearcuick travsv
This quick forward traverse of the slide '2!‘
continues until the tool is nearly in actuatingre- '
invention'set forth in the accompanying claims.
The arm 42! is received in the longitudinal slot
I91 extending lengthwise of the screw 30. There
lation with the work, whereupon the forward
is a bore 43! in the end of this screw rod with
circuit, (Figs. 21, 22, 23,‘ 24 and 35), which 18.
quick traverse circuit of the _quick traverse motor
I02 is opened by opening a switch 434 in said
10 which the slot i0‘! communicates. A tappet 432 exempli?ed as a single pole snap switch and hav
is adjustable lengthwise in this bore' and meets I ing an operating shaft 466 Journaled in a bearing
' with the arin 42! to operate the control switch - 466 and provided‘ with an operating arm 4!‘! ar-,
426. A screw rod 433 has threaded connection
with this tappet for adjusting the tappet length
15 wise of the bore and slot for adjustable coactlon
with the tappet arm 42!.
' ~
The screw rod 433 has bearing in a plug 43
threaded into the outer end of this bore. The
screw rod further has a collar 436 ?xed to, it at
20 one side of said plug and an operating head 436
ranged to be engaged by a tappetf460 ‘adjustably
secured‘ to the tappet wheel 362 for opening this ' '
switch and‘ maintaining it open until again. ac
tuated by said tappet moving in reverse direction
for moving said. arm.__and again resetting. said
switch 454 after reverse actuation of said traverse
After cessation of forward traverse movement
?xed to it at the other side of this plug for hold- , of the tool, the tool is feddnto the work by the 20.
ing the rod to prevent its axial movement. A feed gearing including the train of change gear-'
' protecting hood 43‘! having an extension 438, is ing 60 and by coactlon of the roller 286 with the
.received over the switches and theouter end of cam slot 286 in the. cam drum 219 (Figs. 27 and _ ~
I‘ the screw, and is suitably secured to the support
34). The ?nal portion of’ this feeding movement
ing plate !03 and has a closing cap 439 atits outer ‘is during coactlon of said rollerwith the end 25
end. The extension is removable from the hood portion 30! having‘ reducing lead in said 'slot,
proper by having releasable connection shown as for proper ?nish of the cut and proper runout
a bayonet connection 440 with the hood.
of the tool, forming sharp corners ‘and shoulders I - 30 When the screw 80 is moved outwardly the and preventing ridges in the work.
. ‘~' 'so' '
1 tappet 432 engages the tappet arm 42! and oper
At the end of .the feeding movement, a‘quic
ate-s the ‘control switch 4281in one direction at reverse movement of the tool takes place con
the end of the forward transverse movement at trolled by ‘the actuation of a double pole reverse
a moment determined by the adjustment of the traverse switch,including a switch 46! for mo
tappet 432, and thereby places said feed shaft mentarily closing the reverse circuit of the quick at
under rotative in?uence 'of'the feed mechanism ‘traverse motor I02, and a switch 462 in the main
in consonance with the rotative movement of the
spindle. Upon retractive movement'of the screw
80, to the right as shown in'Fig. 15, the tappet
40 432 engages the tappet arm 42! in opposite direc
.tion for resetting the control switch 420.
The screw 60 is provided witha collar 44!’
‘ _ (Figs. 14 and__15) threaded to the screw and ar
r‘angedto be positioned lengthwise of the screw
and to be clamped in adjusted position by a
clamping screw 442, drawing together a split por
tion of said collar for clamping the screw
threads. .
This collar is arranged to engage a bu?er'
' - sleeve 443 movable endwise in a bearing 444 about
the screw ‘and backed by a buffer spring 445 be
tween sa‘d buffer sleeve and an annular shoulder
446 at the end of said bearing, outward movement
of the buffer sleeve being limited by shoulders
4'! between it and said bearing. This buffer
cushions the inward quick reverse traversing
movement of the screw at the end of said move
The collar 44! is also arranged to contact the
Co tappet arm 42! if this tappet arm should not
have been moved su?iciently by the tappet 432
upon the retraction of the latter forinsuring re
setting of the switch 428.
_ ,
The .collar 44! is further arranged to contact
the-button 448, of a single pole control switch
motor control circuit,>which is opened (Figs. 2,1,
_22, 23, and 35).
I These switches are operated by a shaft 403,
journaled in a bearing 464, and having thereon
van mm 465, engaged by a tappet 466, which is 4.0
adjustable about the tappet wheel 352. This
tappet is received in a recess 46'! of said arm
during the end of the feeding movement .of the
tool toward the work, and actuates said arm at 45
the end of said feeding movement for actuating
the switches 46!, 462. The momentary closing of
the switch 40! ‘energizes the reverse circuit of >
the quick traverse motor !02, whereupon the tap
pet wheel reverses and the tappet 466 moves in
opposite direction for actuating the arm 465m 50V
reverse direction, and thereby resets the switch
46!, it being understood that the momentary .
closing of this switch has energized a. relay
switch for maintaining the reverse circuit of the 55
quick traverse motor I02 closed.
This reverse rotation of the tappet wheel con
tinues until thetappet 353 moves the am 346 for
rocking the shaft 342 (Figs. 21, 22, 23 and 24).
This rock shaft has on it' an ‘arm 41!, which con 80
tacts a push button 412, of a normally closed
single pole switch 473 for opening this switch
at the end of the reverse quick traverse of the -
tool. This switch is in the reversing circuit oi.’
the quick traverse motor I02. This positions the
449 for controlling the stopping of the reverse . tool at the end of its cycle of movements, ready
~traverse of the tool. This switch is physically to begin another cycle of its movements after.
mounted on the bearing 444.
the work 'just out has been removed and a new
In the present exemplification the rear tool’ I piece of work inserted in the machine.
slide 2! is moved toward the center of the work,
In explaining the operation of the machine it 70
?rst with a quick forward traverse by the for
will be assumed that the front toolshave move
ward rotation of the quick traverse motor I02, ments imparted thereto‘ to complete a cycle of
initiated by the push button 45!, (Fig. 35), operation such, for .instance, as depicted in Figs.
which closes the switch 452 in the forward cir
36 to 39 inclusive, andreference is also had to the
cuit of the main motor and a switch 453 in the
electrical diagram shown in Fig. 35. The various 75.
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