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Патент USA US2405686

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Aug- 13, 1946.
Filed June 11, 1945
10 Sheets-Sheet 1
F055? 7- fl C2 ARK
Aug. 13, 1%46.
Filed June 11,‘ 1945
10 Sheets-Sheet 2
P08527- ll. Q4?!
Aug. 13, 1946.
Filed June 11; 1945
10 Sheets-Sheet 4
Aug- 13, 1946.
2,405,686 .
Filed June 11, 1943
' 1o Sheets-Sheet 5
P03527- //. 62 men’
‘Aug. 13, 1946.
Filed June 11, 1943
10 sheets-Sheet 6'
Passer A4 ('4 men’
Aug. '13, 1946. ‘
Firled June 11, 1943
10 Sheets-Sheet ‘7
Aug. 13, 1946'.
Filed June 11', 1943
10 Sheets—Sheet 18
Aug. 13, 1946.
Filed June 11, 1943
10 Sheets-Sheet 9
Paaaer M 62 424/
Aug. 13, 1946.
Filed June 11, 1943
10 Sheets-Sheet l0
Patented Aug. 13, 1946
Robert H. ' Clark; Solon, Ohio, assigncr 'to :The
Warner & Swasey Company, Cleveland, Ohio, a
corporation of Ohio .
Application June 11, 1943, Serial N01‘490g468f:
12 Claims. ( 01. 29—64')' '
2 .
This invention relates to a machine tool and
particularly to a machine tool adapted-to per
drawings illustrating-said embodiment of the in
Fig. '1 is .a front elevationalview of a machine
form rapid machining and threading operations
upon relatively small workpieces, although the
inventionmay- be advantageously employed in’
tool-lto‘ which the invention has been applied,- the
machine tool being shOWn for purposes‘of illus
trationeasea turret‘ lathe whereinthe slide is
manually moved andthe-turretis manually in
Fig. _;2 is an: end elevationalview of the-ma;
machine tools for machining ‘different types of
work. pieces.
An object of the invention is to provide a ma
chine'tool which is so constructed and its oper
ations so~ controlled (that it will» function in ‘an >10. \chine =tool'sh'own' in Figsl and is taken looking-at: improved, rapid and e?icient manner and thus
the left hand end of Fig. -1.
enable the work pieces to bejeccnomically pro
Fig.- 3 is a fragmentary-rearelevational' view
of the machinetool shown: in Figs. 1 and 2 but
Another objectv of the invention is ‘to provide in
on‘a larger scale: 7
a machinetool' of the“ type having an electric
Fig. 4 is -a fragmentary top plan view ortho
motor for driving theispindle at varying speeds
machine tool shown in- Fig. 3.
in oppositedirections; improved means for con:
Fig. 5 is a detail viewtakenpnline 5-5 of-v
trolling the speed and-direction of motor oper
Fig. 3 lookingintheidirection otthe arrows.
Fig.» 6 is ‘a fragmentary-view similar'to ‘Fig.- 4 '»
A further object is toprovide in a machine tool 20 ‘:but'on v‘a ‘largerscale-.and-shows- the-construc- '
of the type having a variablespeed' spindle and
tion of the machine tool partly intop plan and‘
a slide'provided with an indexible turret; impartly inesection. ‘
proved means for controlling'the speeds; the di
Fig.4’? is a front view of the portion of the ma-<
rection-of ‘movement and the'starting and stop-7
chine tool shown in Fig. ‘6 and is partly in 'elevapingof the spindle and which means is actuated 25 tion- and partly; in section; the section ' ‘being
in part by the indexing of the-turret and in part‘
taken substantially 0n"1ine"l'—'—l-0f*F'ig."6 looking
by the movements of the slide; '
in the direction of the arrows.
Fig.8 is a detached View. of a portionvof the
vmechanism-shown in Fig. 16 and-is on a larger
Another and important object is to provide in
a machine tool of‘the type having a reversible
variable speed electric motor-for driving 'the - - scale'twithr the-"parts-shown‘ different rela—»
spindle'and a slide provided with‘ an'indexible
turret, improved ‘means for controlling the
speeds, the direction of rotation and the starting
tionship; .
Fig. 9 is a view similar to Fig. 8 but shows-the
parts in diiferent relationship.
and stopping of the motor‘ for each step of a >
work ‘cycle and which means can be presetand
Fig: 10 is a view similarto Figs. 8 and: 9 but I
shows the parts in a still different relationship.
then actuated in part by the indexing of the ~turret and in'part by themovementsof the slide,‘
Fig. 11 is 'a detached-detail sectional view ona 1
larger scale taken on line I l—-| l of'Fig. 6 looking -
A still further object 'is'to providein a ma~
chine tool such as speci?ed in any of the above
in the direction of the-arrows;
Fig-12 is an: end view taken from the left hand
named objects improved means for plugging the 40 end of» Fig.- v6 on a largerv scaleand'with the endv
cover plate'sremoved.
motor when the control circuit ‘thereto is inter
rupted to slow down the coasting of said motor
Fig: 13 is an irregular‘sectional ‘view ‘taken sub
and also improved means for braking themotor
stantially on line l3'—‘|3 of‘Fig'. 12‘100king in the‘
to stop the rotation of the spindle.
direction of the arrows.
A still further object is to provide the improved 45 Fig. 14‘ is a detached elevational view of ‘the
means speci?ed in'the last object, together with
spindle and the drive therefor and includes a
means for stopping and locating the‘spindle in
braking mechanism and a plugging mechanism
a predetermined position vfor purposes of load
ing and unloading. ~
Further and additional objects and advantages
for the motor.
Fig. 15 is a sectional view on a larger scale than
not speci?callyreferred to above will become apparent duringthe detailed description of anem
bodiment-‘oi the invention‘and which description
Fig. 14 and is taken substantially on line l5-l5
of Fig. 14 looking in the direction of the arrows.
Fig. .16 is a sectional view taken substantially.
on line :l 5—! 6 of Fig. -15 and-looking in the direc
is ' to 7 follow».
tiozrof the arrows‘
Referring‘ to the accompanying
Fig. 17 is a detached elevational view of a part
shown in section in Fig. 15.
Fig. 18 is an end elevational view of the motor
spindle and brake mechanism and is taken look
ing at the right hand end of a' portion of Fig. 14.
Fig. 19 is a detached elevational view on a
larger scale of the control panel shown in Fig.
1, with certain positions of the control lever in
pinion meshing with a rack carried by the slide
of Fig. 19 looking in the direction of the arrows.
Fig. 21 is a detail sectional View taken substan
tially on line 2I--2l of Fig. 20.
The shaft 52 extends rearwardly within the slide
55 and passes through and is ?xed to a stop roll
collar 53, see Fig. '7, The collar 53 abuts against
as is well known in the art.
The turret 45 is indexed automatically by the
movement of the slide and is locked and clamped
by well known mechanism for that purpose and
therefore not illustrated herein. The central
stud of the indexible turret 49 extends into the
slide 45 and has fixed thereto a bevel gear 59
which meshes with a. bevel gear 5! ?xed to one
dicated by dash lines.
Fig. 20 is a sectional view taken on line 25-29 10 end of a shaft 52 that is parallel to the ways 43.
Figs. 22, 23 and 24 are detached views of a
part shown in Fig. 20 and are taken, respective
ly, along line 22—22, 23-23 and 24-24 of Fig.
20 looking in the direction of the arrows.
one side of a bearing boss formed in the slide 45
15 and said collar 53 is rigidly connected to the end
of 9. reduced portion of a stop roll 54 and which
reduced portion rotatably inter?ts said bearing
boss while the shoulder on the stop roll at the
inner end of the reduced portion engages the
disk carrying drum shown in Fig. 12.
Fig. 26 is a developed view similar to Fig. 25 20 opposite side of the bearing boss from the collar
53, wherefore the stop roll is held against relative
but illustrating one of the two identical lower
endwise movement with respect to the slide 45
cam disk carrying drums of Fig. 12.
but can rotate relative thereto.
Fig. 2''! is a top plan view of the most left hand
The stop roll 54 rearwardly of the reduced por
cam disk shown in Fig. 25, with the switch but
thereof is in the form of a sleeve and the
ton indicated in section.
rear end of the stop roll is rotatably supported
Fig. 28 is a, top plan view of the third from the
in a bearing boss 55 formed in a supporting
left cam disk shown in Fig, 25, with the switch
bracket attached to the end of the slide and hav
button indicated in section.
ing a sleeve portion 55 surrounding the sleeve
Fig. 29 is a top plan view of the ?fth from the
left cam disk shown in Fig. 25, with the switch 30 portion of the stop roll and an integral cam disk
supporting drum housing portion 51 for a purpose
button indicated in section.
later to be explained.
Fig. 30 is a wiring diagram of the speed and
The stop roll collar 53 is provided with a plu
reverse control circuits for the motor.
rality of circularly spaced openings concentric
Fig. 31 is a wiring diagram of the electrical
control circuits for the machine laid out in ac 35 to the shaft 52 and aligning with threaded bores
formed in the reduced portion of the stop roll.
cordance with the standardized practice of the
Adjustable stop screws 53 extend through the
American electrical industry.
threaded bores of the stop roll and through the
Fig. 32 is a sectional view through a commer
openings in the collar 53 and can be adjusted
cial form of plugging switch which can be opera
tively associated with the motor and included in 40 longitudinally relative to the stop roll by means
of wrench heads formed on the stop screws with
the control circuits.
in the sleeve portion of the stop roll. The stop
Fig. 33 is a detached view of certain of the parts
screws will correspond in number to the different
of the plugging switch and is taken looking from
indexed positions of the turret and it will be noted
the left hand end of Fig. 32,
that as the turret is indexed the stop roll will
Fig. 34 is a detached sectional View of certain
be simultaneously indexed through the beveled
parts taken substantially along line 34-54 of
gears 59, 5! ‘and the shaft 52 to bring the stop
Fig. 32, and
screws successively in line with a movable stop
Fig. 35 is a wiring diagram of the electrical
. member 59.
control circuits for the machine corresponding
The stop member 59 is ?xed to a cam rod 60
to the control circuits disclosed in Fig. 31 but laid
which is slidably supported in a portion of the
out in accordance with Patent Office standards
base and which portion is provided with a posi
and requirements.
tive stop lug 6| against which the movable stop
Referring to Fig. 1 the machine tool shown
Fig. 25 is a developed view of the upper cam
therein is a turret lathe and comprises a bed 35
supported on spaced pedestals 36 and 31. A
headstock 38 is carried by one end of the bed 35
4 member 59 abuts after it has been moved by the
stop screw which is in alignment therewith. The
positive stop lug 9! is provided with a recess
and rotatably supports the work spindle 39 and ~
chuck 39a and which spindle is driven by a re
versible variable speed electric motor 49 sup
ported by the pedestal 36 and operatively con (30'
which slidably receives a pin 52 carried by the
movable stop member 59, wherefore said member
and the rod 69 are held against rocking move
It will be seen that when the slide 55 moves
forwardly toward the chuck 39a carried by the
extending around a pulley on the motor shaft
work spindle 59 the movable stop member 59 will
42 and a pulley on the work spindle 39, see Figs.
be engaged by one of the stop screws 58 when
1 and 14.
T the slide approaches its limit of forward move
The bed 35 is provided with longitudinally ex
ment and during the remainder of the forward
tending ways 153 which are parallel to the work
movement of the slide for non-threading opera
spindle 39 and adjustably support a base 44 on
tions the movable stop member 59 will be moved
which base slides a turret slide 45 having thereon
into engagement with the positive stop lug 6i
an indexible turret 45. The base 44, in a manner
well known in the art, can be moved to and 70 and the forward movement of the slide is then
positively arrested. This movement of the mov
clamped in adjusted position on the ways 43,
able stop member 59 compresses the coil spring
while the slide 45 is manually moved on the ways
93 which surrounds the rod 59 between a collar
of the base by means of the turnstile 4'! ?xed to
64 ?xed to the rod and a part of the base 44.
a shaft 48 which carries a pinion 49, see Fig. 6,
and is rotatably supported in the base with the 75 The rod 60 has its right hand end, as viewed in
nected with the spindle 39 by means of belts 1H
the drawings, slidably supported in a bore formed,
in theibaseiM. for a purpose later to be pointed
out. ‘The cam rod 60 is provided with. a stepped
recessed cam portion. for'the purpose of‘ control
ling the motor149 during threading operations,
with the lowermost part of said portion connected
to the first step by an inclined camming surface
60a, while said ?rst step isconnected to the‘sec
0nd step
a' similarinclined camming surface
60b, see‘Figs. 6, 8, 9‘and 10.
‘The base 44 is alsolprovided with a bore which
communicates perpendicularly with the bore in
which the cam rod' 60. slides and which bore slid
ably supports a cam plunger 65. which has a re
duced portion extending through a shouldered
bushing 66 and‘ outwardly of the base 44, said
bushing serving as an abutment for one end‘ of
a coil spring 6'! which surrounds the reduced por
tion of'the plunger and has its opposite end
abutting the enlarged portion thereof, as clearly
shown in the drawings.
The reduced portion of the cam plunger 5 ex
surface 60a to compress the spring 6'! and to de
press the switch button ‘H to ‘actuate the switch
LS3 carried by the arm 69 to, reverse the motor
It will be noted that after the parts are in
the position shown in Fig. 8 the movable abut
ment member 59 is still out of contact with the
positive stop lug 6|.
The spindle will coast in
its forward rotation causing a continued forward
movement of the slide due to the threading en'—'
gagement between the tool and the workpiece.
When the switchLSS ‘is actuated to eifect a re
versal of the motor at, the threaded tool backs
off and disengages itself from the work piece when
the motor rotates in'the reverse direction, while
the operator assists the rearward movement of
the slide during the backing oil" of the tool by
manually turning the turnstile 41. It will be
understood that the amount of movement of the
slide due to the coasting of the spindle depends
upon the coarseness 'or ?neness of the thread be
ing cut on the work piece, since the slide will
tends outwardly of the bushing 66 in the" base
move farther in the case of a coarse thread for
44' at‘the rear of the machine and'into a housing
68 secured to the rear'side of the base. An arm
69 is.pivotally supported at T0 in the housing in
termediate the ends of the arm and said arm
carries'a switch LS3 which is actuated by a switch
button ‘H axially aligned with the cam plunger
the same number of coasting revolutions than it
65. The switch LS3 is'located on one side of the '3
pivot 10 for the arm 69 and said arm on the op
59 earlier or later as the case may be.
posite side of said pivot is provided in its edge
with a stepped holding notch formed of two por
tions 12 and 13. A spring pressed plunger 14 sup
ported internally of the housing 68 contacts the
inner- edge of the arm 69 and normally acts to
rock said arm about the pivot 10 in an anticlockn'
wise direction, as viewed in the drawings, and
hold the arm against a part later to be referred
' The housing 68 is provided with an internal
bearing'boss which rockably supports the ver
tically extending shaft 15 which has on its lower
end a ?nger portion 16 and'on its upper end a
thumb lever 1T, the hub of which is provided with
a pointer portion ‘llatthat cooperates with indicia
indicating the two different operative positions of
the ?nger portion 16, namely, the letters““L”
and “151"v representing, respectively, “late” and
“early,” see Figs; 4 and 11.
The" adjustments provided for by the thumb
lever 11 refer‘ to early and'late threading opera;
tions. As will later be explained other control
mechanism functions in conjunction ‘with ‘the
switch 163 for threading'operations. The ?nger
would in the case of a fine thread.
If the oper
ator ?nds during‘ the setup of the machine that
the thread cut on the work piece is too short or
too long he may adjust the stop screw’ 58 to cause
the latter to engage the movable stop member
In the use of collapsible taps or collapsible dies
for threading a work piece the motor 50 can be
reversed at a later point- than was the previously
described case, ‘since the collapsing of the tap or
die terminates the thread cutting and therefore
the coasting of the'motordoes' not. cause any
forward ‘movement of the slide. In the instance
just referred to the operator turns the thumb
lever TI to bring the pointer into line with-the
letter L, indicating late operation of the switch
LSS‘and such movement of the thumb lever brings
the parts into the relationship shown in Fig. 9.
It will be seen that the positioning of the thumb
lever ‘H in the manner stated has caused the
finger T6 to move out of ‘the holding recess '12
and into ‘the holding recess '13 of the lever arm
69, with the result that said arm has been rocked
in a clockwise direction from the position shown
in- Fig. 8 to the position shown in Fig. 9 and which
movement of the arm compresses the spring
plunger 74 and moves the switch button ‘H out of
contact with the extended end of the plunger‘ 75,
although the inner end of said plunger is in the
deepest portion of the cam recess in the rod Bil.
Consequently when the slide is moving forwardly
and the stop screw 58 contacts the movable abut
forming the stepped holding portions 12 and 13.
ment member 59 and shifts the rod 69‘ to com
It will be seen that when the thumb lever is
press the spring 53 the plunger 65 will travel up
in the position shown in Figs. 6 and 8 the ?nger
the inclined surface 65c and onto the first step
portion 16 is in the holding recess '!2 and the lever (50 and this movement of the plunger 65 brings the
arm 89 is substantially parallel to the cam rod."
extended end of the plunger into contact with the
This is the “E” position and will‘be used when
switch button ‘H but does not depress said but
the threading operation involves the use of ‘a
ton. The forward movement of the slide con
solid tap or solid die. It will be noted by reference
tinues and the rod 59 is further shifted with the
to-Fig. 6 that when the lever arm- 59' isv in the 65 result that the end of the plunger rides up the
position just referred to and the plunger 65 ex
inclined surface Sill) and onto the second step,
tends into the deepest portion of the cam recess
wherefore the extended end of the plunger de
of the rod 60 the ‘reduced end of the plunger‘is
presses the switch button ‘H and actuates the
contacting the switch button ‘I! but ‘is not 'de
switch LS3 as indicated in Fig. 10. This actua
pressing said button. It will further be noted that
tion of the’ switch LS3 effects a reversal of the
during a threading operation when‘ a stop screw
motor '49. At the time that the switch LS3 is
58 has contacted and moved the abutment mem
actuated to reverse the motor 40' the collapsible
ber 59 and shifted the rod‘ (ill from the position
tap or die has completed its threading operation
shown in Fig. 6 to the position shown in Fig. 8
and will collapse in the usual manner, wherefore
theplunger 55 has been moved by the inclined
the threaded relationship between the threaded
portion 15 of the shaft 15 extendslinto the recess
tool and the work is terminated and conse
quently any coasting of the motor and the
spindle before reversing will not result in any
further forward movement of the slide.
The switch box or housing 58 has ?xed to its
outer and left hand side, as viewed in Fig. 3, a
switch LS5, the switch button 18 of which is de
pressed momentarily at a predetermined point
portion and cam disk 95 outwardly of the recess
94 and toward the switch button 83 or 84.
Each cam disk 95 can be held in its innermost
or withdrawn position against the action of the
spring I00 by turning the respective button 91
to position the V-shaped ridge 9% out of registry
with the complementary groove 9%, so that said
ridge bears against the outer surface of the boss
on the drum, see Figs. 13 and 26, and at this
in the forward movement of the slide by a dog
19 ?xed to the side of the slide, see Fig. 3. The 10 time such cam disk is in an inactive position
electrical conduits from the switches LS3 and
with respect to its cooperating switch button.
In order to place a cam disk in switch button
LS5 extend from the switch box t8 through a
actuating position its button 9‘! is turned to bring
?exible cable 80 to the cam disk supporting drum
the V-shaped ridge 98 into registry with the com
housing portion 5'5 where said conduits are prop
plementary groove 99 on the cam drum, where
erly connected to three switches later to be re
fore the spring Hi9 forces the cam disk outwardly
ferred to contained within the housing portion
of the recess 94 and into position to actuate the
51. It will be understood that the switches LS3
switch button When the drum is indexed.
and LS5 are also suitably connected to the motor
Referring to Fig. 26, it will be observed that
40 by electrical conduits located within the tube
3| extending from the switch box 58 to the ped 20 four of the cam disks 95 are shown therein in
inactive position, while two of said disks are
estal 36 located beneath the headstock. The end
shown therein in switch actuating position. It
of the flexible cable Bil which is attached to the
will be understood that in the arrangement
housing portion 51 moves with the slide 45, as
shown in Fig. 25 the switch LS4 will be actuated
indicated by full and dash lines in Fig. 3 and
only for two indexed positions of the turret and
said cable is guided and supported in a V-shaped
for the other four indexed positions said switch
support 82 secured to a ?xed part of the machine
will not function.
in this instance the pan.
It will be noted that the cam disks 95 are on
The three switches referred to above as being
their outer faces of conical con?guration, where~
contained in the housing portion 5?! are indi
cated in Fig. 12 at LS2, LS4 and LS6, the switches 30 fore when the drum 9! is indexed the cam disks
which are in switch actuating position will cam
LS2 and LS6 also being indicated in Fig. 13. The
or depress the switch button 84.
three switches are each provided, respectively,
It will also be understood that When the drum
with a switch button indicated at 83, EM and
9| is again indexed to move the cam disk 95 out
85. The switches LS2, LS4 and LS6 are actuated
by the mechanism now to be described.
35 of contact with the switch button 84 the latter
will be spring returned to its normal. extended
The stop roll 54 has a gear 36 fixed to it within
the housing portion 5'! and said gear meshes with
Although in the foregoing description relating
three gears 87, 88 and E9. The gears 81, 88 and
to Fig. 26 reference has been made to the cam
89 are formed on similar cam disk supporting
drums 9!’), 9| and 92 and said drums are rotatably 40 drum 9|, it will be understood that it applies
also to the cam drum 9i) and the cam disks 95
supported within the housing 51 on shafts 23
carried thereby, since both drums 9i) and 9! and
mounted in bosses formed interiorly of the hous~
their cam disks are of identical construction and
ins, see Figs. 6, '7, l2 and 13. It will be observed
the corresponding disks of the drums are identi
that the switch buttons 83, 8t and 85 of the
switches LS2, LS4 and LS6 are located adjacent 45 cally adjusted in the present illustration, al
though they may be individually adjusted in dif
to the left hand face of the drums Sill, e! and
ferent arrangements to suit various operating‘
92 as viewed in Figs. 12 and 13 and it will be
seen that said buttons are in position to cooperate
The drum 92 is provided in three of its re
with instrumentalities carried by the drums and
50 cesses with cam disks 95, see Fig. 25, and the
later to be explained.
buttons 91 connected to these cam disks 95 are
The drums 90, 9| and 92 are each provided in
of identical construction with the buttons 9'! of
this instance with six equally spaced circularly
the previously referred to cam disks 95 and said
arranged recesses 94 and which recesses face to
cam disks can be positioned in either an inactive
ward the switch buttons 83, 84 and 85. One of
the recesses M of each of the drums 9i! and 91 55 or an active position by means of ridges 98 on
the buttons and grooves 99 on the outer faces of
will be aligned, respectively, with the switch
the bosses of the cam drum 92.
buttons 83 and 84 for each indexed position of
It will be observed by reference to Fig. 25 that
when one of the cam disks 95 carried by the
will be located intermediate two of the recesses 60 drum 92 is in switch actuating position and the
indexing of the drum brings said cam disk into
94 of the drum 92, see Figs. 12 and 25.
contact with the switch button $5 to actuate the
The drums 90 and 9! each carry six identical
switch LS6 the depression of the switch button
the turret 135, see Figs. 12, 13 and 26, while for
each such indexed position the switch button 85
cam disks 95 (see Figs. 6 and 26) formed. on
85 is a momentary one and the cam disk comes
shouldered portions of shafts 9.5 and which por
65 to rest in a position which allows the switch but
tions slidably inter?t the recesses 94 of the drums
ton 85 to return to its extended position. This
while the shafts slidably pass through openings
arrangement is due to the fact that the switch
in the drums. On the outer end of each shaft
button 85 when the drum 52 is in indexed posi—
96 there is formed a button 91 which is provided
tion is located intermediate adjacent recesses as
on its inner face with a diametrically extending 70 of the drum 92 and that the switch LS6 need
V-shaped ridge 98 which is adapted to cooperate
only be actuated momentarily for a reason later
to be explained.
when in an aligned position with a complementary
groove 99 formed in the drum 90 or 5|. A coil
The drum 92 in the remaining three of its re
spring I 00 surrounds each shaft 95 within the
cesses 94 is provided with cam disks H)! which
recess 94 and acts normally to urge the shoulder 75 are of different construction than are the cam
disks 9.5 for a purpose which will be explained.
ing recess'in which is slidably mounted a spring
pressed plunger I I3 which engages the upper side
‘If the shaft I l I and which functions in conjunc
The cam disks I 0| are formed on shouldered por
tions of shafts I02 similar to the shafts 95 and are
provided on their ends with buttons I03. The
buttons 163 differ from the buttons 91 in that
the former areprovidedon their sidesadjacent
to the drum 9.2 with a single V-shaped radially
tion with a pin IIA vcarried by the bracket and
engaging the underside of the shaft to return
automatically the bracket I99 and the lever I08
extending ridgeIM and which ridgecan be placed
when ‘released from their outwardly swung posi
tion,v i. e., the dash line position of Fig. 20, back
in registry with either one .of two angularly dis
to their normal or full line position. The recess
posed .radially extending complementary .V -10 in the bracket I09 engages with flat portions of
grooves I05 and I95 formed .in the outer surface
of the drum 92, see Fig. 12, wherefore it will be
seen that the cam .disks IOI can .be placed in
either one of two extended .positions depending
upon which of the grooves 105 or 106 is placed in ~
registry with the ridge I94. The cam disks on
their outer ends consist of .a .segmentalportion
IOIa .of conical configuration and asegmental
portion. .IOIb .of flat con?guration. jWhen a .but
ton IE3 is positioned with theridge [Mengag
ing in groove I106 then .the cam disk VII'I’I .is in
the position .of the most vlefthand cam disk Ill-I
of Pig. 25.and as shown in .the .plan viewinFig.
27 the. switch button .85 is resting .on the ?atseg- mental portion .I.0 lb .of .the .cam .diskandis :held
depressed. This is. theposition which any one
of the cam disks .I0l. may .be brought .tofor a
purpose later .to ‘be explained. . When the button
1.03 of .a particular cam. disk .I.0.I is .turned to
bring .the ridgeJBA. into registry .withthe groove
l05 .that particular cam diskIiH will take the
positionindicated for the middle cam disk. I01
inFig. 25. Whenathe camdiskIBI :is in the.p0si
tion just referred to it will be extended so that .as
the drum 92 is indexed said cam disk. IOI will
the shaft I I I, wherefore said bracket I09 and the
lever I58 can be vrocked about the axis of the shaft
H I‘ into any one of four different positions.
‘The bracket‘ Hi9 above the recess H0 is pro
vided. with a flat segmental shaped surface ad
jacent the panel I01 and said surface contacts
.a switch rod ‘I l5 which is slidably supported by
the panel I0‘! ‘and has at its inner or right hand
end, as viewed in Fig. 20 a recessed portion hous
ing a coil spring I I8 which abuts against a revers
ing switch LSI and functions to urge the switch
rod II5 toward the ‘left but said rod is normally
held against the action of the spring IIIS by the
bracket I09. The switch button I I v1 of the revers
ing switch LS I. contacts the bottom of the re
cessed right handend of the switch rod H5 and
said rod normally'maintains said button depressed
for forwardactuation of the motor 49. However,
when the operator ‘rocks the lever I33 and the
bracket I99 from the vfull line-position of Fig. 20
:into the dash line position thereof the rod II5
moves toward the left under the ‘action of the
spring II6 and‘the switch button II'I follows the
movement of the rod and the switch LSI is actu
vated for‘reverse operation of the motor :10. As_
momentarily depress the switch button .‘85 since
soon as the operator ‘releases the lever I98 the
the latterrides up the conical portion I9 Ia across
spring pressed plunger II3 overcomes the spring
the center of the cam disk .IOI and thendown
HS and will restore said lever, the bracket I09,
the ;.other. conical :side of the disk as indicated
andithe rod ‘II-5 to the position shown in full lines
bydashlinessin ‘Fig. 25 and as shown .in .plan 40 in‘ Fig. 20, at which time the button III of the
view in :Fig. 28, it being noted that the flat por
switch LSI is again depressed and said switch is
tion 10 Ibof the .disk is now at right angles ,tothe
set for forward actuation ;of the motor.‘
location it had in Fig. 27 and hence said flat .por
' The switch shaft as previously stated is rock
tion now will not hold theswitch. button depressed.
ably supported in the panel I01 and it will be
Thejpurpose. of the arrangement of the middle 4.5 noted by reference ‘to Fig. 20that the rear end of
cam disk .I9;I.of Fig. 25 as just referred to will be
said shaft is rockab-ly supported in a plate I~I8
carried by‘a plurality of parallel rods I I9 secured
in and projecting rearwardly from the panel I01.
shownin the third .position of adjustment which
The switch shaft 1 I I :is provided with a plurality
can be imparted to the camdisks .IOI, namely,
of axially spaced shoulders I20, I H, 122, I23 and
said cam disk is withdrawn to an inactive .posi
I124. Two actuating pins I25 and. IE5 extend be
tion wherein it will not .ccntactthe switchbut
tweenthe shoulders I20 and I2I and said pins
ton 85 to depress .the same asthecarn drum.92
are parallel to the shaft ;I II but radially spaced
is indexed and at this .time the ridge: I04 of the
therefrom,‘ with the pin I25 angularly spaced
button I03 is contacting thefaceofthe bossof-the ;; ‘from the pin 125, see ‘Fig. 21. An actuating pin
drum .92 and holding the cam disk in inactive
l'2'iextends between the shoulders I2I and I22
position (see‘Fig. 29.).
andzsaid pin is located in a manner corresponding
As shown in Fig. 1 a control panell 01 is secured
to the location of thelpin 125, see Fig. 22. An
to the front side of the headstock .33 and said
actuating pin I28 extends between the shoulders
control panel is shown in Fig.119 on a. larger scale. to i,22 and I23 and said pin is similar to the pins
The ccntrol'panel I01 carries. a master switch
previously referred to except that it is located in
explained hereinafter.
. The most right hand cam disk I0.I .of Fig. :25 is
control‘ lever I60 which is ?xed in a lever bracket
I09. The lever bracket I09 in its lower portion
a different position circumferentially of the shaft
and shoulders as indicatedin Fig. "23. An actu
and adjacent to the panel I0? is providedwith
a recess H0 into which extendsthe projecting’
end of a switch shaft II l later to be referred to.
ating pin I29 extends ‘between the shoulders I23
Abearing pin H2 is carried by the bracket .I09
and I24 and said pin I=2_9 is similar to ‘the pre
viously described ‘pins and is located circumfer
entially of the shaft 90°- from the pins I25 and
and extends through the shaft III and forms a
I2'I, see Figs. 21, 22 and 24. '
pivot about which the bracket and the lever "I08
Four of the rods II9 are ‘grouped in pairs
can be rocked from the ful1lineposition of Fig. 20 .70 above and to the left of the shaft I II, as viewed
to the dash line position thereof, it being noted
that the lower right hand portion of the bracket
I09 isbeveled to permit this rocking movement
in Fig. 21, and these rods support cooperating
switch contacts I30, I3I located soas to extend
past the. shaft III and between-the shoulders
and to .form a stop to limit the extent thereof.
I20, I2.I,..I22, I23 and I24 and the switches
Bracket-I09 is provided with a vertically extend 75 formed by the‘contacts I30 and I 3| are herein
after designated as switches MSI, M82, M33
and M54, see Fig. 20. Each of the contacts
I36 and IEI has a clip portion I32 which em
braces the rods IIEI and holds the contact in
proper position thereon.
tions the switch LSI for forward actuation of
the motor. Also the lever I08 can be rocked
about the axis of the shaft III to any one of
four positions to selectively close switches MSI
and MS2 for the “high” position; open the switch
M82 and close the switches MSI and M83 for
the “low” position; open the switches MSI and
It will also be understood that the contacts
I30 and I3I are suitably insulated from the
M83 for the “neutral” position, the switches
rods H9 and at their upper ends are provided
M82 and M84 already being opened; or close
with contact screws II3, whereby electrical con
duits can be connected to the contacts.
Each 10 the switch M84 for the “brake release” position
of the lever, the other switches now being open.
contact IIII is provided intermediate its end
The panel I01 is provided with a “start”
with an offset portion I34 arranged to be en
button I35 and a “stop” button I36 for actuat
gaged by its respective actuating pin to close
ing the main control switches later to be re
the contacts I30 and II“, it being understood
that when said portion is not engaged by its 15 ferred to, it being understood that said buttons
I35 and I3‘Ii need only be momentarily depressed
respective actuating pin the resilience of the
as they are automatically returned by spring
contacts maintain the same normally separated.
pressure to their extended or normal positions.
When the lever I08 is positioned at “high” see
The control panel I01 is also provided with rock
Fig. 19, the actuating pin I25 is in contact with
‘the portion I34 of the switch contact I3I of the 20 able switch knobs I31 and I38 for controlling
a “set-up” or “run” switch I39 and a “hand” or
switch MSI and the contacts I30 and I3I of said
“auto” switch l39a similar to switch I39 and
switch are closed. At this time the pin I25, as
illustrated in the wiring diagram later to be de
indicated in Fig. 21, is not in engagement with
scribed. It will be noted by reference to Fig. 19
the portion I34- of the contact arm ISI. Also
at this time the actuating pin I21 is in engage 25 that the arrows on the knobs I31 and I38 visu
ally indicate the different switch positions for
ment with the portion I34 of the contact arm
the different settings of the knobs.
I3I of the switch MSZ but the pins I28 and I29
The braking mechanism shown in Figs. 14 and
are out ofv engagement with the portions I34
18 for the motor shaft 42 will now be described.
of the contact arms I35 of the switches MS3
and M84. Consequently in the “high” position 80 The brake mechanism is supported on a suit
able bracket within the pedestal 36. Referring
of the lever I08 the switches MSI and MS‘Z are
to Figs. 14 and 18 it will be seen that the pulley
closed for a purpose later to be explained.
on the motor shaft 42 for the belt III is axially
When the lever I08 is moved from the full
extended and can be engaged by the brake arms
line position of Fig. 19 to the dash line “low”
I40 and I4I provided with suitable brake pads
position the shaft III is rocked and brings the
pin I25 in engagement with the portion I34 of.
the contact arm I3I of the switch MSI and keeps
said switch closed. This rocking movement of
and which arms are pivoted on the sup-porting
bracket at their lower ends and embrace the
extended portion of the pulley. The upper ends
of the arms I40 and MI are interconnected by
the shaft III causes the actuating pin I25. to
ride out of contact with the portion I34 of the 40 a rod I42 which extends through aligned open
ings in the arms. The rod I42 carries a coil
contact arm I3I of the switch MSI and also
spring I43 which abuts the arm I40 and an ad
causes the actuating pin I21 to ride out of con
justable nut I44 screwed on the rod I42. The
tact with the portion I34 of the contact I3I of
rod I42 is provided with a head I45 which en
the switch MS2 and hence this latter switch is
now open. Consequently when the lever I33 46 gages one side of the arm IIII while the opposite
side of said arm is engaged by a collar I46 se
is set in “low” position the switch‘ MSI is closed.
cured to the rod I42. A collar I41 is mounted
Also the rocking of the lever from “high” posi
on the rod I42 intermediate the collar I46 and
tion to “low” position causes the pin I28 to en
the arm I40 while the upwardly projecting arm
gage the portion I34 of contact I3I of switch
MS3 to close said switch. Therefore, in the 50 I48 of a bell crank lever straddles the rod I42‘
intermediate the collar I41 and the upper end
“low” position both switches MSI and M83 are
of the arm I40. This bell crank lever is pivoted
closed. At this time the switch M52 is open.
to the arm I40 and has its long arm I49 pro
When the control lever is moved from “low”
jecting through an opening in the brake arm
position to “neutral” position the pins I25 and
I28 of switches MSI and M83 ride out of en 55 II“, as clearly shown in Fig. 18. The outer or
free end of the arm I49 of the bell crank lever is
gagement with the portions I34 of the respective
operatively connected to the armature of a
' contact arms I3I and said switches are now open.
solenoid I50.
Also at this time switches M52 and MS4 are
It will be seen that when the solenoid is not
open. When the control lever I06 is moved
from the, “neutral” position to the dash line. 60 energized the spring I43 normally maintains the
brake arms I 40 and I4I in braking engagement
“brake release” position of Fig. 19 the switch
with the extended portion of the pulley, but that
M34 is closed by the engagement of the actuat
when the solenoid I58 is energized to rock the
ing pin I29 with the portion I34 of the contact
arm I49 of the bell crank lever downwardly then
arm I3I of said switch but all of the switches
MSI, M82 and M53 are open.
65 the arm I48 of said bell crank lever forces the
collar I41 and the rod I42 toward the right.
The foregoing detailed description relating to
This action of the arm I48 of the bell crank lever
the control lever I08 may be briefly summarized
results in the arm I4! being rocked toward the
by the statement that normally the switch LSI
right about its pivot and at the same time the
is conditioned for forward actuation of the motor
40, but can be conditioned for reverse actuation 70 brake arm I 40 which is pivotally connected to
thereof by rocking the lever I08 from the full
the bell crank lever is rocked to the left about
line position of Fig. 20 away from the panel
its pivot compressing the spring I43 and reliev
to the dash line position thereof, while the re
ing the braking action of the arms on the ex
lease of said lever by the operator automatically
tended portion of the pulley. The manner in
restores it to the full line position and condi
which the brake mechanism is applied and re
leased will be fully set forth in the description of
though this plugging switch per se forms no ‘part
the wiring diagram which will come hereinafter.
In connection with the control of the brake
mechanism it is often desirable to stop the ‘spindle
in certain de?nite positions to facilitate the op
erator in loading the work piece in the chuck,
especially when a two-jaw chuck is employed or
when the chuck is held in a side opening ?x
ture. The mechanical portion of the brake con
trol mechanism for stopping the spindle in def
inite predetermined positions consists of a ‘com
mutator which will now be described.
A pair of rings I5I of insulating material is
mounted on the spindle 39 with the rings in
axially spaced relation and these rings are each
rovided with a segmental ‘radially extended por
of the present invention it is believed advisable
for purposes of clear illustration to describe the
switch somewhat in detail.
The operating shaft I 56 of the plugging switch
is operatively connected to the spindle of the
motor 49, see Figs. 14 and 32. A rotor I51 is‘
mounted on the operating shaft I56 and said ro
tor operates within an aluminum cup I58 which
has a slight clearance between it ‘and the rotor
and between it and the housing.
The' rotor I5‘! is permanently magnetized and
rotates with the armature of the motor 4t‘ and
such rotation of the rotor tends to rotate- the
cup I53 in the-same direction as will be well un
erstood in the art. The cup I 58 is provided with
tion I52 for a purpose which will soon become
a centrally located bearing shaft I59 which is
apparent. The rings I5I support a sleeve 1-53
rotatably mounted in a bearing boss formed in
formed of electrically conductive material and
ternally of ‘the housing of the plugging switch ‘I 55.
provided with segmental openings into which the 20 The cup I58 alsolhas ?xed thereto a rod I69 ex
segmental extended portions I52 of the rings
tending in the same direction and parallel to the
project with the outer surface of the extended
shaft I59 and said rod passes through a slot YIEI
portions flush with ‘the outer surface of the
formed in an internal wall in the housing. The
sleeve and forming therewith a continuous cylin
rod I6!) is held in centralized position by means
drical surface. A pair of spaced contacts I54 are
of a pair of levers 152 pivoted at their upper ends
located in spaced relation and engage the outer
to said internal wall of the housing and engag
surface of the sleeve I53 in line with the rings
ing at their lower ends diametrically. opposite
I5I. The contacts I 54 are held and supported
sides of the rod lee ‘(see Fig. 34). Springs I63
stationary in the headstock and are electrically
of predetermined tension maintain the levers
connected with the wiring circuit as Will later be
I82 in engagement with the rod and centralize
explained. Consequently it will be seen that as
the latter in the opening I?i, it being vunder
the spindle rotates the contacts ride on the outer
stood that when the tendency of the cup to rotate
surface of the sleeve £53 for the major portion
becomes greater than the tension of the springs
of each revolution of the spindle and at such time
I53 then the rod
will move in the opening
the sleeve completes the electrical circuit be
Isl and swing one or the other of the levers It?
tween the contacts.
However, during a small
about its pivot and against the spring vtension. ‘A
portion of each revolution of the spindle the con
contact bar I54 is pivoted at its upper end to
tacts are in engagement with the segmental ex
internal portion of the housing, while its lower
tended portions I52 of the rings iii-I and since said
end extends through a slot in the rod
rings are formed of insulating material the en
bar I64 intermediate its ends is provided with a
gagement of the contacts with the portions I52
contact I 65 which normally is located interme
interrupts the circuit.
diate a‘ pair of spaced ?xed contacts .565)‘ and
As has been pointed out, the brake mechanism
I661‘ but which When the bar its is swung by the
is applied by the spring I43 ‘except when the
movement of the .rod IE!) will engage with one or
solenoid IE-? is energized, and hence when the 45 the other of said ?xed contacts depending on
commutator just described is functioning after
the direction of rotation of the rotor. A solenoid
the motor control circuit has been interrupted
lie"! is located in the housing of the plugging'switch
and after a plugging switch, laterto Ice-described,
and has pivoted thereto a latch arm I 5% which at
has reduced the coasting rotative speed of the mo
its free end is provided with a notched portion I69
tor the solenoid I50 will be energized during the 50 that can be engaged by gravity with the rod It!)
major portion of each coasting revolution of the
to hold the latter in central position. When the
motor shaft and the brake correspondingly re
solenoid I 67 is energized the latch arm i623 is
leased, while during the minor portion of each
lifted from the full line position of Fig. 33Ito the
such revolution the solenoid is momentarily de
dash line position thereof and the latch por
energized and the brake mechanism applied by
tion I89 is released from the rod I58, whereupon
the spring M3. In
words, as the motor
the latter is free to rock under the tendency of
shaft slowly coasts the brake mechanism will
the cup I58 to rotate and .it will'be understood
be momentarily applied each time the segmen
such rocking movement will cause the contact
tal portions i522 engage thecontacts I51; and then
I65 to engage one or the other of the fixed con
released when such engagement ceases. Con 60 tacts I65)‘ and I567‘, depending upon the direc
sequently the coasting of the motor shaft will be
tion of rocking movement.
quickly terminated, as during the coasting ‘revo
As will be pointed out later in describing ‘the
lutions of the shaft the brake mechanism is mo
electrical control of the machine the latch por
mentarily applied and then released until the
tion I69 will be in latching position on the rod
shaft stops in a de?nite predetermined position. 65 I60 so, long as, the ‘motor All is not running. The
Suitable means is operatively associated with
instant that the motor to is energized and corn.
the motor 118 for plugging said motor to quickly
mences running the latch I59 will be liftedhy
reduce the speed of the same after the operating
the solenoid I61 and the rod I59 will be ‘free to
circuit to the ‘motor has been interrupted and
move with the cup I58 against the tension of the
before the brake becomes effective to stop the 70 springs I63 so as to bring the contact i555 into
coasting rotation of the ‘motor and spindle. Al
engagement with one or the other of the fixed
though such plugging means may take vvarious
contacts IBSf or I661‘, depending upon the direc
forms the present illustration shows a commer
tion of rotation of the motor 40.
cial and well known form of plugging ‘switch I55
It may be well to point out here that the
operatively associated with the motor. Even
torque tending to rotate the ‘cup I58 is propor
inner terminals, as will be well understood in
the art.
In the high speed operation of the motor 4!]
when the forward switch I'M is opened and the
reverse switch I15 is closed, the wires HE! and
tional to the speed of the motor 40 and that as
soon as the speed of the motor diminishes to the
point where the tension of the springs I53 is not
overcome the levers I62 restore the rod I60 to
its central position and disengage the contact I65 CFI
with respect to both ?xed contacts I66)‘ and
III to the outer terminals I82 and I83 are re
versed, whereupon the motor is energized for
high speed operation in the reverse direction.
The function of the plugging switch will be ex
It will be understood that the forward and re
verse switches are the low and high switches just
plained further in describing the wiring dia
grams for the electrical control of the machine.
In order to explain the function of the parts
heretofore described, and particularly the various
explained and the circuits through said switches
to the motor terminals are well known in the
switches, the operation of the machine will now
be described for both manual and automatic
operation and with reference to the wiring dia
grams of Figs. 30, 31 and 35. The description of
the operation of the machine will ?rst be with
reference to the hand or manual operation there
of and then the setup and automatic operation
of the machine will be described. When the rna~
chine is manually operated all of the buttons in
the housing til at the tail end of the ram or slide
are pulled out and rotated to a position wherein
their ridges are out of engagement with the slots
and are contacting the bosses on the faces of the
ventional diagrammatic way in Fig. 30.
Referring to Figs. 31 and 35, it is pointed out
that the solenoid Fwd. controls the forward
switch I'M while the solenoid Rev. controls
the reverse switch I15. It will also be understood
that the double solenoid High controls the si
multaneously acting high speed switches I80 and
IBI, while the solenoid Low controls the low
speed switch I'It. It will be well to note at this
time that the control circuit contains certain
safety interlock normally closed switches between
cam drums, at which time the cam disks are in
inactive position and will not contact the respec
tive switch buttons. In other words, during the
manual operation of the machine the switches
LS2, LS4 and LS6 are not operated, it being noted,
however, that switch LS6 is a normally closed
switch while switch LS4 is a double throw switch
which is normally in a high speed operative posi
tion. The switch LS2 is a normally open switch.
In addition, the switch LS3 is not actuated by the '
stop screws of the stop roll during manual opera
Referring to Fig. 30, the wires Il'?, III and H2
constitute a multiphase circuit from a source of
electrical energy and this circuit includes a main _
disconnecting switch I13 indicated diagrammat
ically in Fig. 30. The wires I'M, III and H72 lead
art and therefore are only illustrated in the con
the line III) of the control circuit and the sole
noids Fwd, Rev., High and Low, just referred to.
Normally closed safety switches R and F are
located in the circuits for the solenoids Fwd. and
Rev., respectively. When solenoid Fwd. is ener
gized switch F is opened and when solenoid Rev.
is energized switch R is opened. Therefore, only
one of the solenoids Fwd. and Rev. can be ener
gized at a time.
Normally closed safety switches L and H are
located in the circuits for the solenoids High and
Low, respectively. When solenoid High is ener
gized switch H is opened and when solenoid Low
is energized switch L is opened. ‘ Therefore, only
one of the solenoids High and Low can be ener
gized at a time.
Referring to Figs, 31 and 35 it will be seen
that the control for the machine includes a start
and stop circuit containing start and stop
to the three contacts of the forward switch I'M.
switches, indicating light and a master switch
The three wires Ilt, III and I12 also lead to the
contacts of a reversing switch I15. After the 45 MSI. The control diagram also includes a for
ward and reverse circuit containing solenoids
forward switch I74 is engaged then the circuit
Fwd, Rev., CR4 and CR3 which actuate the
is extended by the three primary wires I'm, I2’!
motor control switches and other switches in the
and H2 to the three contacts of a low speed
circuit as will later be referred to. In addition
switch I'IB from which the primary wires extend
to the three terminals I'I'I, IIS and I‘IB (illus 50 there is a threading circuit containing the sole
noid CRI and the indicating light circuit for the
trated inv Fig. 30 as the inner terminals) of the
light 223. Also the control includes the High
motor and the latter is operating in the forward
Low circuit which contains the High and Low
direction at low speed. Assuming that the re
solenoids for actuating certain motor control
verse switch I'I5 is closed and the forward switch
H4 is opened, the low switch remaining closed, 55 switches as well as other switches. Further, the
control for the machine includes the positioning
then the wires III) and III are reversed through
circuit which contains the commutator on the
the closing of the reverse switch I15, it being
spindle and the solenoid CR5. Cooperating with
noted that the wire I'I2 remains thesame. With
this positioning circuit is the brake circuit which
this condition existing the motor 40 will be en
includes the brake solenoid I50, as Well as cer
ergized in the reverse direction, it being under
tain switches actuated by the solenoids of cer
stood that at this time the wire III! will be con
tain of the other circuits. A dead spindle circuit
nected to the inner terminal III while the wire
contains the solenoid CR2 as well as the limit
III will be connected to the inner terminal I78.
switches LS6 and LS5 and the holding switch
Assuming that the forward switch I14 is closed,
the low switch H6 is opened and the simultane 65 CR2. Finally there is the plugging circuit con
taining the plugging switch.
ously operated high speed switches I86 and ISI
In describing the hand operation of the ma
are closed, then the circuit to the motor by the
chine a number of assumptions will ?rst be stat
wires I'III, III and I72 extends, respectively, to
ed before describing the operation in detail, It
the terminals I82, I83 and Its (illustrated in
Fig. 30 as the outer terminals) of the motor. In 70 will be assumed that the slide is in its most rear
ward position and that the No. 1 face of the tur
addition, the closing of the high speed switches
ret is located toward the chuck of the work spin
I80 and ISI has connected the inner terminals
dle. It will also be assumed that the main control
I18, IT! and I19 in an endless circuit by those
lever I68 is in neutral position, see Fig. 19, and
portions of the wires I'IB, III and I'I2 leading
from the high speed switch I8! and to the three 75 that the switch knobs I31 and I38 on the panel
I91 are set, respectively, in the run and hand
positions. In addition, the cam disks which con
trol the switches LS2, LS4 and LS6 will be as
sumed to all be located in the inactive position.
Furthermore, the stop screws 58 of the stop roll
will be assumed to have been adjusted properly
for positively arresting the forward movement
of the slide at predetermined positions for each
of the operative steps of the work cycle, While the
commutator on the work spindle will have been 10
adjusted for stopping and locating said spindle
in predetermined position.
and normally closed switch L. The energization
of the double solenoids “high” closes the high
motor control switches I89 and IBI and also
opens normally closed switch H in wire 295 which
prevents energization of solenoid “low.”
It will be understood that when the normally
open switch CR4 in wire 292 of the brake circuit
was closed then the circuit through brake sole
noid I59 was completed through the wire 292 and
the brake released.
It will also be understood that when the nor
mally open switch CR4 in wire 29I of the plug
ging circuit was closed the circuit through plug
switch solenoid I51 was completed and said
solenoid released the latch I68 of the plugging
switch and said switch became free to function
in the manner previously described.
The operator continues the forward movement
of the slide by the manual rotation of the turn
stile until such movement is positively arrested
by the engagement of a stop screw with the pos
itive stop lug, after which he revolves the turn
stile to move the slide rearwardly to clear the
tool from the workpiece and then indexes the
The operator now momentarily depresses the
start button I35 to close the starting switch in
the start and stop circuit and complete the cir
cuit through solenoid UV by means of the wire
I85 extending between the wires I19 and Ill and
including the stop switch I36 which is normally
closed. The starting switch I35 and stop switch
I36 are single throw spring-returned switches
and the momentary closing of the starting
switch energizes the solenoid UV and closes the
normally open switch UV in the holding circuit
I39 and also closes the normally open switch UV
in the wire I81. The wire H35 and holding circuit
turret to bring No. 2 face into operative position.
I86 being energized the primary I88 of a trans
Assuming that the second step of the operative
former is energized and causes energization of
cycle requires low speed operation of the spindle
the secondary I99 of said transformer and which
in the forward direction, the operator moves the
secondary is connected to the indicating light
control lever I99 from the high position to the
899 on the switch panel. The operator now loads 30 low position wherein switch MSI in thestart and
a work piece into the chuck of the work spindle
stop circuit and switch M53 in the high and low
and it will be assumed that then he moves the
circuit are closed, it being understood that switch
control lever I98 into the high speed position,
M82 is now open. Consequently the spindle will
When the control lever I98 is in the high speed
now be rotating in the forward direction and at
position the switches MS! in the start and stop
low speed; it being understood that no changes
circuit and the switch MSZ in the high-low cir
take place in the forward and reverse circuit
cuit are closed. The operator by means of the
from the condition of that circuit as explained
turnstile moves the slide forwardly and during
relative to the ?rst operative step. The high and
this forward movement the dog carried by the
low circuit now is completed through solenoid
slide momentarily closes switch LS5 to complete 40 “low” by the wire I99 extending from switch
the circuit through solenoid CR2 in the dead
l39a, the wire 2I9 which includes switch M83,
spindle circuit, it being recalled that switch LS6
the wire 295 and the normally closed switch 1-1.
is normally closed. The momentary closure of
It will be understood that the instant switch
switch LS5 causes energization of solenoid CR2
M82 opened and the double high solenoid in wire
in wire I9I, effects closure of normally open
294 was deenergized switched H closed and also
switch CR2 in holding circuit I92 and thereafter
that the instant solenoid “low” became ener
during the manual operation of the machine the
gized switch L in wire 294 opened, thus prevent
solenoid CR2 remains energized and consequent
ing energization of the high solenoids. The en
1y any further momentary actuations of switch
ergization of the low solenoid closed low motor
LS5 in the movements of the slide have no e?ect :r control switch I76, while the deenerigization of
on the circuit through the solenoid CR2 as now
the high solenoids opened high motor control
established. The energization of the solenoid
switches £99 and I8I.
CR2 also closes the normally open switch CR2 in
Assuming that the second operative step is a
the wire I 93 of the forward and reverse circuit.
threading operation, the operator manually
Now the spindle commences to rotate in the 'for- .
moves the slide forward with the spindle rotating
ward direction and at high speed.
at low speed in the forward direction until the
It will be seen that the forward and reverse
threading die engages the work piece, at which
circuit for the control of the motor now includes
time he grasps the control lever E98 preparatory
the wires I94 and I95, the switch I39, wire I93,
to reversing the spindle operation. As soon as
switch CR2, wires I 99 and I99, double throw
the threading die has threaded the work piece
switches LS1, CRI, solenoid Fwd. and normally
the desired distance the operator pulls the con
closed switch R. Also in the forward and reverse
trol lever outwardly and away from the panel
circuit the solenoid CR4 in wire 299 is now ener
to actuate the double throw switch LSI in the
gized. The energization of the solenoid Fwd.
forward and reverse circuit to open the contacts
closes the forward motor switch I'M and opens 65 of said switch in the wire !99 of the forward
the normally closed switch F in wire 296 which
circuit and close the contacts of said switch in
revents energization of the solenoid Rev. The
the wire 2.99 of the reverse circuit. Consequently
energi'zation of solenoid CR4 closes normally
the circuit through solenoid Fwd. is interrupted
open switch CR4 in wire 29I of the plugging cir
and therefore forward motor control switch I'M
cuit, normally open switch CR4 in wire 292 of the
is opened.v The deenergization of the solenoid
brake circuit and opens normally closed switch
Fwd, allows normally closed switch F to close
CR4 in wire 293 of the positioning circuit.
and therefore the circuit is completed through
The high and low circuit is now completed
solenoid Rev. which closes reverse motor switch
through the wire :94, wire 591, switch I39a, wire
I15 and opens the switch R, preventing energize.
I96, switch MSZ, wire 294, double solenoids high
tion of solenoid Fwd. The deenergization of sole
noid Fwd. also deenergizes solenoid CR5 which
opened switches CR4 in wire 20! of the plugging
ing in the forward direction and thus slow down
such coasting rotation until the spring-tensioned
arms of the plugging switch move the contact I65
circuit and wire 292 of the brake circuit and
thereof out of engagement with the ?xed con
allowed normally closed switch CR4 in wire 203
of the positioning circuit to close. However, si Ch tact l56F to interrupt the circuit to the solenoids
Rev. and CR3. The deenergization of solenoid
multaneously with the deenergization of solenoid
CR3 opens switch CR3 in wire 208 of the plug
CR6, solenoid CR3 in wire 28'! of the forward and
ging circuit and thus interrupts the circuit to and
reverse circuit was energized, wherefore normally
deenergizes solenoid I61 of the plugging switch.
open switches CR3 in wire 208 of the plugging
The deenergization of solenoid I61 allows the
circuit and in wire 2&9 of the brake circuit closed
latch of the plugging switch to drop by gravity
while normally closed switch CR3 in wire 203
and hold the movable contact I65 out of engage
of the positioning circuit opened. Therefore, the
ment with either of the ?xed contacts lBGF or
brake remains released, the positioning commu
IEBR, wherefore both wires 226 and 225 are dead.
tator continues to be inactive, while the plugging
switch is conditioned to function when the oc 15 The deenergization of solenoid CR3 allows nor
mally closed switch CR3 in wire 233 of the posi
c'asion occurs. The operator continues the rear
tioning circuit to close, whereupon solenoid CR5
ward movement of the slide by means of the
in said circuit is energized whenever current is
turns-tile to assist the die in running off of the
flowing through the positioning commutator.
work and when the die is clear of the work no
will release the control lever IE3 which will auto 20 The energization of solenoid CR5 closes switch
CR5 in wire 2&5 of the brake circuit and causes
matically actuate the double throw switch LSI
the brake solenoid hit to be energized and the
to restore forward actuation of the motor.
brake held released even though the deenergiza
Assuming that the slide has been moved sufli
tic-n of CR3 solenoid has caused the switch CR3
ciently far to the rear to permit the indexing of
in wire 209 of the brake circuit to open. There
the turret, the operator will perform this function
fore the spindle will be free to rotate at the slow
and position No. 3 face of the turret in opera
coasting speed to which it has been reduced by
tive relationship to the chuck of the work spindle.
the action of the plugging switch, except that
The operative steps so far described have included
forward high speed operation of the spindle, for
ward low speed operation thereof and also reverse ,
each time the portions [52 of the insulating rings
of the commutator engage the contacts I54 the
positioning circuit is interrupted and the solenoid
CR5 deenergized, whereupon switch CR5 in the
brake circuit opens, deenergizing solenoid I50 and
applying the brake. This application of the brake
is momentary so' long as the spindle is coasting
as the extended portions m2 of the insulating
low speed operation. The manner in which the
spindle may be operated in the reverse direction
at high speed will be obvious from the descrip
tion already set forth in connection with the dia
grams of Figs. 30, 31 and 35. Therefore we may
assume that the operator has operated the ma
rings of the commutator will move out of en
chine through all of the six steps of a complete
gagement with the contacts I55 and the latter
work cycle to the point where the slide has been
will engage the sleeve l53 of the commutator and
moved rearwardly at the end of the sixth step
and it is desired to unload the ?nished work piece 40 current will be established through the position
ing circuit and the solenoid CR5 again energized
and load a new work piece in the chuck.
to close the switch CR5 in the brake circuit and
At this time the operator moves the control
release the brake. In other words, the position
lever E93 into neutral position wherein switch
ing commutator will function during each re
MFA in the start and stop circuit is open and also
maining revolution of the spindle to alternately
both switches M52 and MS3 in the high and low
circuit are open.
Therefore the forward and re
verse circuit is interrupted as is also the high and
low circuit. The motor when its control circuits
are thus interrupted will continue to coast in the
forward direction, assuming that this was the :
last direction of operation of the motor. At this
time the plugging switch becomes eifective to slow
down the coasting rotation of the motor.
apply and release the brake and then stop the
spindle in a predetermined position. The slow
ing down of the motor and spindle by the plug
ging switch will allow the motor and spindle to
be brought to a rest in the predetermined posi
tion by the positioning commutator after one or
two revolutions of the spindle, depending upon
the adjustment of the plugging switch.
The operator can now unload the ?nished work
As already explained, the previous operation
piece and reload a new Work piece in the chuck
of the motor conditioned the plugging switch for
and repeat the cycle of operation already ex
functioning when the occasion occurred. There
plained. In case it is not desired to locate the
fore, the movable contact E65 of said switch has
spindle by the positioning commutator and to
been in engagement with the ?xed contact IESSF
have the spindle free to be rotated by hand, the
during the forward rotation of the motor. Con
sequently the solenoid CR3 has been energized 60 operator can move the control lever I08 from the
neutral position into brake release position to
through the plugging switch and the normally
close switch MS4 in wire 25!, N2 of the brake
open switches CR3 in the plugging circuit and
circuit and maintain the solenoid I50 energized
the braking circuit have continued closed while
and the brake released to allow him to freely
the normally closed switch CR3 in the position
ing circuit has continued open. However, dur 65 rotate the spindle by hand.
ing the forward operation of the motor no cur
Set-up of machine for automatic control of
rent could flow by way of the plugging switch
motor circuits
through the Rev. solenoid, inasmuch as switch
is to be set up for automatic
F has been held open by solenoid Fwd. The in
control of the motor circuits the control lever I E18
stant that switch MS! opened solenoid Fwd. was
is positioned and left in either the high or low
deenergized and switch F closed, whereupon cur
position so that the switch MS! in the start and
rent can flow through the wire 225, the plugging
stop circuit remains closed.
switch, wires 226 and 201 to energize solenoid
The operator turns the switch knob I31 on the
Rev. and close motor reverse switch H5 and im
part reverse current to the motor while it is coast 75 panel [ill to set-up position, whereupon the for
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