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Патент USA US2111170

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March l5, 1938.
R. s. coNDoN
Filed Sept. lO, 1935
11 sheets-sheet 1
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March 15, 1938.
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March 15, 1938.
‘ R. s. coNDoN
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I 2,111,170
Patented Mar. 15, 1938
'Robert s. condon, menester, N. Y.,a corpi'iration4
Gleason Works, Rochester, N. Y.,
of New York
'Application september 1o, 1935, sensi No. 39,952
-22 claims.
The present invention relates to machines for
finishing and testing gears, particularly to ma
chines of the combination type for lapping and
»testing or burnishing and testing gears. In a
6 4more specific aspect, the invention relates to ma-,
chines for lapping or burnishing and testing
.spiral bevel and hypoid gears.
One of the principal objects of this invention
is lto provide an automatic machine for lapping
10 and burnishing spiral bevel and hypoid gears,
the gears so that the teeth. of one bottom in the
tooth spaces of the other.
It has been necessary heretofore, then, to set
up the gears with sumcient back-lash to avoid
interference at the ends of the teeth as one gear
moves first toward the small end and then to- -
ward the larger end of the teeth oi' the other
- gear. This has meant, of course, that in the cen
trai position, the. amount of back-lash between
jthe gears will be more than necessary'- and ac
cordingly the lapping a'ction will be reduced.
which will operate according to the basic princi- '
In the machine of the present invention, pro
ples of the U. S. patent 'ci' Alton P. Slade, No.V . vision is made for mechanically and-automatical-l
1,796,484 of March 17,V 1931 and which will be of ly maintaining a uniform amount of back-lash
- simpliiled and» improved construction as -com
between the gears during lapping‘in all positions
l5 pared with. the automatic machine or the joint of their relative movemen . Thus the most ef
U. S.'patent of myself, E. W. Bullock and. Eyvind fective lapping action can be obtained through
v Finsen, No. 1,881,999 of October 11, 1932.
out the whole of the lapping operation and .there
StillA another object of the invention is to pro
fore the speed of the lapping operation can be
vide a machine ofthe type in which the relative
20 positions of the meshing gears are. changed dur
. ‘ In the machines of both the patents mentioned,
ing lapping in order to effect the lapping opera-> the relative longitudinal and transverse move
e tion and to obtain a suitable' localization ol’ tooth ments~ between the meshing gears are effected by
bearing, in which the amount of back-lash be
oscillation of a carrier in which one of the gears
; tween the gears may be controlled and, if desired, is eccentrically mounted. This same construction 25
25 maintained substantially constant `throughout is retained in the present machine. In order/ to
-obtain the desired tooth bearing on opposite sidesv
, Another object of the invention is to provide 'of the teeth, practice has demonstrated that`it
a gear burnishing or lapping'machine in which
the lapping or burnishing operations on _opposite isdesirabletorun the meshing- gears together nrst 30
in one direction and then in the other and that
> ' Sil-'sides of the teeth ‘can be eiîected at different during rotation in opposite directions, the carrier
~ Still another object ofthe invention is tc pro
vide in a combined burnishing or lapping and
testing machine, improved `means for both pro
tecting the operatorïagainst injury and prevent
ing damage to the- gears being-burnished, lapped
_ should be oscillated
through diñerent angles and
-at diiïerent rates. This is becayse of the difter
ence in the eiïects' of lapping or burnishing on
the drive and coast sides of the’gear teeth.
' '
In the machines of both prior patents men
tioned, two different cams were employed to
produce the diñering oscillating motions required`
Other objectsof the invention will be apparent ~for the burnishing _or lapping of the opposite
hereinafter from the specification and from the sides of the gear teeth, and it was necessary to 40
v<10 -recital of the appended claims.
shift these cams manually or automatically, at
in the machines' of the type described in Pat
the time of reversal of the direction of `rotation
>ent Nos. 1,796,484 and 1,881,999, lapping or bur
of the gears, to bring them successively into oper
nishing of a pair of spiral bevel or hypoid gears ating position.. The gearswere run for a given
is accomplished by rotating the pair of gears to periodin one direction with one cam producing
4_5 be lapped or burnished in mesh land simultane
the ‘oscillating motion of the gear carrier, then
ously moving one ofthe gears in directions both this cam was shifted out of position-- and the
' longitudinal of the axis of the other gear and other cam brought into operative position, the
transversely thereof.,
_ ,
gears were reversed and then run in the oppo
In burnishing, the‘teeth of -one gear are bot
site direction with the second cam producing'the 50
50 tomedin the tooth _spaces of the other and are oscillating motion of the gear carrier, and then _
held in engagement by spring pressure and as at the en‘d of a given period-the machine'was
the one gear moves longitudinally and trans
stopped. In the burnishing or lapping of either
versely of the other gear, the springs yield and side of the gear teeth, the carrier-control cam
, cramping of the teeth of the gears is avoided. made one or more revolutions and hence in the 55.
or tested;
56 In lapping, however, it-is not desirable to mesh
lapping or burnishing of the two sides of the
teeth, the cam shaft made a plurality of revolu
tions. Hence, it was necessary in both prior ma
chines to employ an automatic stopping mech
anism having a counter arrangement to stop the
machine when the lapping or burnishing opera
tion was completed.
In the preferred embodiment of the present in
vention, a single'cam is employed to control the
oscillating motions of thecarrier in the finishing
of both sides of the gear teeth. One-half of this
cam controls the oscillating motion of the car
rier during finishing of the drive side of the teethand the other half of the cam controls the mo
15 tion of the carrier during finishing of the coast
side 0f the teeth. It is not necessary to shift
from one cam to another between the operations
on the opposite sides of the teeth. Moreover, in
a single revolution of the cam shaft, theY whole
20 cycle ofoperation of the machine is completed.
Hence the expensive automatic stopping mecha
nism heretofore required can be and is eliminated
Means is provided instead for reversing , the'
gears and stopping them directly from the rota
25. tion _of the cam sh
ing or lapping- o
. The rates of the burnish
rations on the two sides of the
teeth are contolled by separate sets of change
gears Awhich drive the oscillating cam at differ
ent rates during the lapping _or burnishing of
30 opposite sides of the teeth.
In the embodiment of the invention illustrated.
i in the drawings, the gear spindle is journaled in
a sleeve or quill which is axially movable in the
oscillatable carrier. For lapping,- this sleeve is
moved axially to maintain a_ controlled amount
motions are employed.
A guard is, of course,
provided on the machine to enclose the gears
during lapping or burnishing.` Safety features
have been incorporated in the _electrical circuit
of the machine so that for lapping, the guard
must be closed and the oscillating cam must be
in operating position while `for testing, the guard
open and the yoscillating cam must be
. Yout ofbeoperative
As a further safety
feature, to prevent any possibility of the oper
ator getting'his hands caught` between the gears,
during testing, provision is made so that the oper
ator must keep one hand on a push button dur
ing the whole of the test in order to keep the ma
chine running. His other hand, of course. will 15
be out of the yway as it will be operating a hand
brake to apply the load required to test the gears.
In the drawings:
Fig. '1 is the side elevation, with parts broken
away, of a combination burnishing or lapping 20
and testing machine constructed according to the
present invention;
s '
Fig. 2 is a plan yview of this_machine;
Fig. 3 is a longitudinal sectional view of` the ,
gear head of a machine arranged for lapping,
the section being taken substantially on the line
3--3 of Figure 2;
Fig. 4 is a corresponding view of> a machine ar
ranged for burnishing;`
' Fig. 5 is an end view partly in~ section, of the 30
gear head and supporting column taken _at right
angles to the section of Fig. 3;
Fig. 6 is a detail view vof the contact members
for imparting the oscillating and reciprocating>
motions to the carrier and quill, respectively, in 35
of back-lash by oscillation of a screw which ` the
lapping machine;
threads into a nut that is secured to the sleeve.
the line
This provides a very simple, compact construc
l~1 of Fig. 5, showing the cam shaft and details y
tion. For burnishing, the screw and nut are Aof
the drive therefor;
omitted but the' gears are held in mesh with the
is a sectional view taken approximately 40
teeth of one bottoming in the tooth spaces of the on the 8line
8_8 of Fig. 7;
- other by coil-springs which operate directly upon
the quili- or sleeve. This constitutes an improve
ment in burnishing machine construction, be
cause‘the springs are able to act more directly
upon the gears than in the prior machines, and
there` is less likelihood of vibration or chatter.
Fig. 9 is a view looking at the end of the gear l
head and showing the hydraulic back-lash brak
Fig. 10 is a developedsectional view on the line» 45
Ill-_l0 of Fig. 9;
Fig. 11 is a sectional view on the line H--I l of _ _
A further improvement of the present ma ' Fig.
chine particularly valuable for lapping, is an im- ‘
so proved back-lash brake. This is inthe form of
a hydraulic pump driven _from the gear spindle.
The pump forms part of anopen hydraulic sys
tem-and is connected to a sump so that when the
pump is in operation, it will pump liquid outAof
Fig. 12 is a fragmentary sectional viewshowing>
g1 detail the mechanism for adjusting the pinion
Fig. 13 is a sectional view of the lapping guard,
showing the piping for conducting the lapping
v55 the sump `‘and discharge it back into the sump
compound on to the gears and the limit switch
again. The amount of load or resistance to be
_lapping or burnishing operation;
Fig. 14.- is a fragmentary view taken at right
applied to the gears is determined by the’ setting
oi’ a relief valve which controls the discharge
from the pump. -The greater the liquid pressure
.60 required to open the relief valve,fthe greater the
resistance to the turning of the pump and, there
fore, the greater the resistance to the rotation of
the gears, that is, the greater the load applied to
them. more
type of brake
which insures that the guard is closed during a _
angles to' Fig. 13 Iand showing details ofthe dis
tributing system for lthe lapping compound;
Figures_15 and 16 are side elevational views of
typical cams for controlling the oscillating and
axial movements of the carrier and quill, respec
Fig. 17 is a fragmentary sectional view on the
brakes are liable to wear and if oil or grease get
line I'i-Il of Figure'ï;
. Fig. 18 is a fragmentary sectional view on the
on the friction surface, slippage, or grabbing will
line |8-l8 of Fig. '7:
occur. The lapping of gears is a precision opera
l JFigures 19A to _24 inclusive are diagrammatic
brake used on vprevious machines.
_ f
tion and the improvement in the back-lash brake views- illustrating how interference will occur„
makes possible a more accurate product.
during lapping at the ends of the teeth of the 70
As indicate above, then/machine of the pres-ent - meshinggears in the shifting movements of -one .
invention ma- _be used forI lapping or burnishing gear under oscillation of the` carrier if some
and testing. For» testing, the gears are simply means are not provided to compensate for each
76 run together on center and no oscillating or axial
interference, and
16 and 11. The gears 14 and 15 are held on- their
' respective shafts by nuts' 18 and 19, respectively,machine.
' Ó
Referring now to the drawings by numerals of which thread on the shafts and by the washers
Fig. 25 is an- electrical wiring diagram. of the
which cooperate with these nuts. ' . ‘
reference, 30 designates the base or frame of the
machine. _
` _ The shaft 16 is journaled on anti-friction bear-
On this base or frame there are
ings 80 and 8| in the bracket 13. -The shaft 11 is
a column 32 (Figures 1, 2, and 5). These are ê.iournaled on anti-friction_ bearings 82 'and 83 in _.
adjustable on the base or frame at right angles the bracket 13.
'I'here is a spur gear 84 keyed to the shaft 16 ` '
to one another to bring the gears to be lapped, .
burnished, or tested into meshing engagement.- and there is a spur gear 85 keyed to the shaft 11 10
- mounted, as in previous machines, a head 3| and'
These gears are adapted to be mashed selective.,l
Journaled in anti-friction bearings 34 and 35
in'the’head 3| is -the drive-spindle 36 of the ma- '
chine. The pinion of the pair of gears'to be
. burnished,"
lapped or tested, Y_or if a special bur
15 nishing or lapping pinion is used, that pinion,
is secured to the drive-spindle 36. Any’ suitable
with a spur gear 8_1; (Figs. 7 and 8) that is inte- __ ‘
gral ,with a sleeve 88. This sleeve is mounted to
slide upon a shaft 90 .that is journaled on anti
frictiorrbearings 9| in the bracket 13 and on anti- 15
friction bearings 9_2 in an arm 94 that is secured
to the bracket 13 by screws 85. -
chucking mechanism may be employed for secur
The shaft 30 has a'worm 96 formed Í integral
_ ' .
ing the pinion to the drive-spindle. In the ma.
chine illustrated, a hydraulic chucking mecha.- _
20 nism, designated as a whole at 38 is employed
for this purpose. As this chucking mechanism _
is of standardv construction and forms no partof
the present invention, it will not be described in
with it that meshes with a worm-wheel 91 (Figs.
8 and '7). 'I'he worm-wheel 91 is keyed to a 20
.sleeve 88 which forms-'a bearing for a slidable
shaft 99. There are two pins |00 and |02 se-cured in the worm-wheel Y31 to project from one
- detail here. The pinion spindle 36 is'driven from. _ side thereof.
Pivotany mounted at los inthe brackems is 25 '
25 a motor 40 mountëd in the base of the machine
through pulleys 4| and 4_2fand the belting 43 a yoke-member |05 having a ldng arm |03 and a'
connecting the same.
short arm |04. -In .the rotation of the worm
The column 32 is provided with vertical ways45 (Figs. 5 and 7) on which the gear head 46 is
30. vertically adjustable. The means for adjusting
_ the head 46 on the column 32 may be the same
wheel, the pin |00 isi?dapted to. engage the long
arm |03 of the yoke-member and hé pin |02 is _
v adapted to engage _the short arm |04 of said yoke- 30
member, thereby shifting ithe yoke-member al
as employed in the machine-oi’.- Patent No. ternately in opposite directions about its pivot
-1,881,999-and for that reason will not further be ’ |06. 'I'he yoke-member carries opposed rollers ,
vlill which ‘engagev in a recess or _groove |08
described here.
The gear or driven spindle 48 of the machine is
carried in this gear head 46. `It is iournaled on
formed between‘the shoulders |09 and I|0 of the 35
sleeve 88. Thus, as the worm-wheel 91 rotates,
anti-friction bearings 49. and 50 in a sleeve or - -the yoke-member |05 is rocked ilrst in one di
quill 5| and this quill is slidably mounted in an rection and then in the other'about its pivot |06
oscillatable carrier 52 (Figs. 3 and 5). lThe - to
85 engage
(Fig. '7) the
gear 81the'
gear 84. with
The the
84' 46’
40 mounting of the spindle 48 in the quill 5| and of .
the quill 5| in the _carrier 52 is such that the
laxis of the spindle 48 is offset fromthe axis of
and 85 drive the gear 81 in the same direction so
thatthe worm-wheel 81 is driven in thesame di
the carrier but parallel thereto, 'thatÁ is, that rection regardless of whether the gear 81 is -en- '
_ spindle 48 is- mounted eccentriçally in the carrier. - gaged with the gear 85 or the gear 84, but the
'I‘he carrier is journaled _in 'plain bearings 5_4 and.. worm-wheel 911s driven at one rate when the 45 °
55 formed integral with the head 46.
The gear G to be burnished, lapped ortested
or, in case a special burnishing or lapping.,gear
is used, that gear, is secured to the driven spindle
50 48.
For securing the gear to the spindle, any
suitable type of chucking mechanism may be em
ployed. In the machine illustrated, a standard
hydraulic chuckin'g mechanism, 4designated as a
whole at 58 is employed, but as this mechanism is .
- of known construction» andforms no part of the
present invention,- it will not further be de
scribed here.
in, for a purpose which will appear hereinafter. 50 '
'I'ol insure quick shifting of the'yoke-mem'ber
|05 _and to insure that the -gear 81 remains in
contact with either the gear 84 or 85, which has
previously been-driving it. until the yoke-member
has been shifted so that there will be a continu- 55
ous drive to the worm-wheel 91 at 'all times, av
loadïand -fire mechanism and a drag-detent are
Mounted on _the column 32 of the machine is
l a motor 60 (Flgs.'l, 2, and 7). This motor drives
gear 84 is driving the gear 81 and at a diiïerent
rate when the gear 85 is driving the gear 81.
The external groove -|08l in the sleeve 88~ is
wider than the'rollers |01, which operate there- -
.The yoke-member |05"is `‘operated by a load
the carrier 52 and, during lapping, the reciprocat
and ñre mechanism comprising a plunger ||5f60
ing quill 5|, as will now be described. The motor
plunger is spring-pressed outwardly by"a coil
- is -connectedby a' suitable coupling 6| with a
shaft 62 carrying the worm 53.
This _worm 68
that is housed in a bore in the bracket 13. This
spring ||6 and it has a V-shaped outer end or~
e4 (Fig. s) that is.. head || 8 vwhich engages the V-shaped head H0
- _meshes with a worm wheel
65 keyed to a shaft 65. The shaft
85 is journaled on
anti-friction bearingsv 68 and 61 in a bracket 13
which is secured to the column 32.
Splined _to the shaft 85 are a pair of" spur
change-gears '68 and 69. These are secured
against a shoulder formed on the shaft by the’
nut 10,` which threads on the shaft, .and by the
washers 1|
and 12.
'I'hespur-gears 68 and 88 mesh, respectively,
with spur-gears 14- and 15 (Fig. '7) which have
splined connections, respectively, with the shafts
of a stud ||1 that is secured in the yoke-member 65
|05. As soon as the yoke-member 805 is rocked
past center in either direction', this load and
fire mechanism operates to swing it on quickly
and positively to the end‘of its movement.
The bore of the` sleeve 88 is formed with two 70
conical recesses or grooves |20 and |2|. The shaft
80 has a hole |22 drilled diametrically through
it. yThere is a pin |23 mounted in this hole that
has a conical head_|24. 'A sleeve |25 telescbpes ,
on the-pin |23 and thishas a conical head |26. 75 .
The two headed members are adapted to en-'
the handwheel |41 which is secured to a shaft
|48 that threads into the arm and that abuts
at its inner end against the opposed end face
.pressed apart and into engagement with’these of the contact member |44. lThe extremity of
recesses by a coil spring |21. The heads’l24 and the arm |45 is in the form of a Split clamp and
|26 are pressed by the spring |21 into engage -fthe contact member may be secured in any ad
ment with one or the other of the recesses |26 ’ ‘ justed position in the arm by vtightemmg the
or |2| depending upon the axial position of the clamping lever |49.
sleeve 88 and act as a frictional drag 'on the
Fr'om the above description it will be seen that
-10 sleeve to preventfits axial movement until posi
„ when the cam' |32 is engaged vwith the roller
gage in the recesses |26 or |2| depending upon
the axial position of the sleeve 68 and they are
tively shifted _by the yoke-member |05.
» |35 and the shaft 99 is rotated. the cam |32 will
As above described, the external groove |68 inv . impart a reciprocating movement to' the‘bar |38
y the sleeve 88 vis wider than the pins |01 which to oscillate the carrier 52 on its axis, "thereby
operate therein. Hence, during the ñrst part causing the gear _to be swung about an axis ec
15 'of the movement of the yoke-member l|55 in
centric of its own axis. Of course, when the
either direction, no ymovement is imparted to ‘ disc |3| is .engaged with the roller |35, the car, 16
the sleeve- 88 4and gear 81 and it is not until rier will remain stationary despite the rotation
after the yoke-member has passed center and is of shaft 99 because the disc‘is concentric of the
being thrown on to the end of its movement by > shaft.
the spring pressed plunger ||5 thatv the sleeve
88 and gear 81 start to move. The double headed
plunger |24-I25 serves to hold the gear 31 in
engagement with whichever of the gears B4 o1;
35 that has been driving it, until the' yoke has
Then the momentum of the'yoke
under actuation of the spring-pressed plunger-
25 passed center.
|| 5 is sufficient to overcome the frictional re
sistance of the drag-detent |24-|25 and the
sleeve 88 is moved on into its new axial posi
The drag-detent serves to insure that the
30 tion.
gear 81 remains in driving engagement
either the gear 84 or 85 until movement of he
yoke on to its new position is insured. Thus
assurance is had of a drive at all times to the
worm-wheel 91.
The shaft 99 is slidably mounted in the sleeve
98 and in a plain-bearing |36 which is secured
in a plate |45 that is secured in 'any suitable
manner Ato one side of the column 32. y Keyed to
40 the shaft is a disc ISI on whose hub is mount
ed a cam |32 which is secured to the disc |3|
by screws |33. 'I‘he periphery oi? the» disc |3| is.
concentric with the axis of the shaft 99. The
' . cam |32 may be of any‘suitable shape, one typi
cal form of such cam being shown in Fig. 15.
|35 denotes a roller whichl is mounted upon a
stud |36 which is threaded into a cylindrical bar ‘
|38. -The bar |36 is adapted to slide 'in a tubu~
lar guide formed in a bracket |39, which is~secured to the plate |46 that is secured to the
column 32. Either the cam |32 `or the disc |36
. The disc or cam selectively is brought into en
gagement with the roller |35 by moving the shaft
95 axially. Axial movement of .the shaft is
effected by movement of a lever |53 which is
plvotally mounted at |51 on the column 32. This
lever is formed at its short end with a yoke por
tion having pins |59 which engage in a peripheral
recess formed in the shaft‘99.
To insure that a cam |32 is engaged with the .
roller |35 when a pair of gears are to be lapped
or burnished and4 that the disc |3| is engaged with
the roller when a pair of gears are to be tested,
a safety device is provided. This comprises a
double-throw switch |96 (Figs. '7 and 25) which
is mounted onf the column 32 in such position that
the roller |91, carried by its arm |98 is engaged
by one of\the pins |59 of the lever |53 to rock the
switch arm when the Shaft 99 is shifted in either
direction. The function of this switch Will be
described more particularly hereinafter.
Keyed to the shaft 99 at one end thereof is a 40
sleeve |56 (Figure 7). 'I'his sleeve is journaled
on anti-friction bearings |5| and |52 in the end
cap |54 of the bracket |39. Secured to the flange
|55 of the sleeve |56 by screws |56 is a cam |5E3.
This cam.l may be of any suitable conformation.'
One typical form of such vcam is shown in Fig. 16.
'I'he cam |56 is adapted to engage a roller |63A
which is rotatably mounted upon a stud, |6| . The
stud |5| is secured in one end of Aa cylindrical
bar |62 which is slidable in a cylindrical 4guide 50
formed in the bracket |39 parallel to the guide
may be engaged with vthe roller |35 by shift
in which the bar |38 slides.
ing the shaft 99 axially.
ng lapping or .f
burnishing the l'cam is engage with the roller
while during testing the disc is ‘engaged with the
roller as will hereinafter appear.
Mounted in the bar |38`at the end opposite
that which carries the roller |35, is a stud |42
on which is mounted a roller |43. 'I‘he roller |43
60 engages one end of a contact-member vor stud
|44, that is adjustably mounted in- the arm |45
This bar |62 -is -of reduced dimension at itsl
outer end and engages the half-round endof a
contact member or follower |64 which is rotat-' 55
ably adjustable in a sleeve |63 that is adjustably
threaded inthe arm |65 (Figs. 6 and'3).
tating the contact -member 180° from the position
shown in Fig. 6_it can be thrown out of engage
ment with the bar |62 so as to render it in
of alyoke-member |46 (Figs. 6, 3 and 4). The operative., In this position its tip. will engage
yoke member |46 _takes its bearing on the pe _ the surface of the arm |66 which is securedto
riphery of the carrier 52 and is secured to the `the bracket |39'(Fig. 7) by screws |61. 'I'he
contact member> |64 is held in either position of its
carrier 52 in any suitable manner to transmit adjustment
by set-screws |68 and |69 which are
motion to the’ carrier.
~ ~
The contact-member |44 is. held in engage~ Y adapted to engage in longitudinal grooves |10 and
|'|| formed in the contact-member. 'I'he contact
ment‘with the roller |43 of the bar |38 and the
.roller |35 of this bar is in turn held in> engager` member is held against axial movement relative
to the sleeve |63 by the nut |12 which is threaded
ment with the cam |32 by a spring (not shown)
which operates to urge the carrier in one direc
tion about its axis.
may bbe
the same as shown in the Bullock et al. patent
-above mentioned. The contact member |44 is
754 adjusted axiallyin the arm |45 by rotationof
on the outerend of the reduced stud portion of 70
the contact member.
' "
'I'he arm |65 is p_ivotallymounted at |14 (Fig. 5)
in a guard |16 and has a'depending portion (Fig.
3) which is keyed to a screw shaft v| 15 which is
journaled in suitable bearings in the head 46 and 76
n 2,111,170'
in the guard |16. 'I'he guard |16 is secured to
the head.
The screw shaft |15 has a threaded
portion |11 which engages in a nut |18. This
nut |18 is secured in _a ring |19 which is rigidly
held between the inner end of the quill 5| and a@
spacer member |88 that is secured to the sleeve
or quill by screws, |82. The spacer member |88
is also held against axial movement relative to
the quill 5| bythe sleeve |84 which is keyed to
10 spindle 48 and which is formed with. a iiange
|85 that engages in a circular recess formed in
the spacer member |88. The sleeve |84 is heldin
position -by the brake-drum |86 which is secured
on the spindle 48 against axial movement rela
15 tive thereto by the nut. |81 that threads onto the »
spindle. ,
From the preceding description, it will be ap
parent that as the cam shaft 99 rotates, the cam
|58 (Fig. 7) will impart a reciprocating movement
20 to the bar |62 and this in turn will oscillatethe
arm |65 and screw |11 to move the quill 5| axially
points 2|8 and 2H (Figs. 17'and 7). There is a
bar 2|8 mounted on the blade-arm 281 and this
bar carries a pair of contact points 2|2 and 2|3.
A plunger 2|4 is slidably mounted in the body
lportion 285 'of the switch. A coil-spring 2|5,
which is interposed between the plunger 2|4 and
the blade-arm 286, serves to urge the plunger 2 I4
downwardly and outwardly ofthe body portion
285_ and also serves to urge the contact points 2|8
and 2H towards contacting engagement with a 10
pair of terminals 2|_1. A coil-spring 2|9 which
is interposed between the body portion 285 of
the switch and the .blade arm 281 serves to urge
the contact points 2|2 and ZIB into contact en
gagement with the terminals 228.
The body portion 285 of the switch is urged in
one direction about,` its pivot 284 by a spring
pressed plunger 222 which is pivotally connected
,at 223 to the body portion'285 of the switch. This
plunger is housed and slides in an opening 228 in 20
the end plate 225 which is secured` to the bracket
|39. The coil-spring 228 which surrounds the re
to and fro in the carrier 52, lthereby imparting
>an axial reciprocating movement toy the spindle duced stem portion of >the plunger 222 and is
housed in the opening 225 serves to actuate the
48 and the gear G mounted thereon.
quill' 5I by the screws |9| and theïdowel |92
serves to transmit the oscillatory motion of .the pressed plunger 238 which is mounted to slide
carrier 52 to the quill 5| andspindle 48 as the in an opening 232 in the end plate 225. A coil
spindle rotates and the quill moves axially. y The
30 recess |94 in the carrier in which the key |98
engages is longer than the key to permit free
axial» movement of the quill in the carrier while
maintaining the oscillating driving engagement
between the two.
Coil-springs |95 are provided to take up back
"lash- in the screwl |18 and yto urge the quill A5|
continuously rearwardly in' the carrier 52. 'I'hese
' springs, which are provided at angularly spaced
intervals around the carrier, are- mounted in
aligned >openings in the quill and carrier and bear
_ at one .end against the spacermember |88 and
at their opposite ends against the carrier,
Thecontact-member |84 (Figs. 5, 6, and '7) is
held against one end of the bar |62 _and the roller
|68 is held in contact with` the periphery of the
cam |58 by action of the spring-pressed plunger
|96V (Fig-5). This plunger is housed in a bore in
spring 233 is housed in this opening 232 and sur
rounds the stem of the plunger 238. This spring 30
is interposed between a shoulder formed on the
plunger and a guide-plate 235 which is secured
in any suitable manner to the end plate 225.
There is a teat 238 formed on the projecting
portionmf the plunger 238 at one side thereof. 35
The «tip of the plunger 2| 4 is beveled off and the -'
teat 236 has an oppositely beveled tip to cooperate
therewith'. As the cam shaft 99 rotates in the
direction indicated by the arrow in Fig. 17, the
cam 288 engages the end of the plunger 238 and 40.
forces this plunger inwardly in the bore 232
against the resistance of the spring 233. In this
inward movement of the plunger 238, the plunger
2I4 rides up and over the teat 236 and the teat
engages behind the plunger 2|8.- When the cam 45
288 rides off of the end of the plunger, the spring
‘233 forces the plunger outwardly butbecause of
the engagement of the teat 238 with the plunger
2|8, this outward movement of the plunger 238
the body portion 285 of the switch about the
50 spring |99 housed _within a bore of the plunger
pivot end 284 in a vcounter-clockwise direction, - ,
|96 actuates the plunger.
causing the blade» arm 286- to break contact with
In 'addition to the cams I32fand |58, there are the
terminals 2|'1 andthe 'blade-arm 281 to make
a pair of cams 288 and 28| carried by the cam
shaft 99. The cam 28 |4 is keyed to the cam shaft contact with the terminals 228.
by the same keyi'wh-ich serves to secure the disc . 4The terminals 2|1, as will hereinafter appear, 55
|3| to the cam shaft (Fig. 7) and the cam 288 is are in the circuit of the main-drive motor 48,
pinned to the cam 28I`. The disc |3| and the which drives the gears being burnished, lapped
' the Vguard |18. It engages a roller |91 that is
secured by a stud |98 to the arm |65. -A'c'oil
1 cams 28| and 288 areheld against axial move
ment on theshaft by the nut 283 which threads
60 onto the shaft.
The cam 288 operates' a double
throw switch which controls thev direction of ro
tation of'the gears being burnished', lapped or
tested and the cam 28| controls‘asingle throw
or tested, when the gears are rotating .in the
lforward direction and the terminals 228 are in
the circuit of the motor when the gears are being 60,
driven in the reverse direction.
After plunger 238 has rocked the switch 285 to
break contact with the terminals 2|1 and make l
switch that _eiïects the stopping of the machine ~'contact with terminals 228, the plunger continues
to move outwardly under 'actuation of the spring 65
65 at the end of the burnishing, lapping or testing
.operation The double throw switch is -shown in 233 .until the`teat 236 rides clearl of the plunger
2|8. Then, of course the’plunger 222 and spring
' Fig. 17 and the single throw switch in Figà 18.
226 will rock the switch> back in the opposite
'I'he double throw switch comprises a body por
tion 285 and a pair of blade-arms 286 and 281 directionA to break contact at the terminals 228
and make contact again with the terminals 2W. 10
70 that are pivotally mounted at 288 on the body
To insure that'the contact points 2|2 and 293
portion 285. The body portion 285 is -itselir piv
make contact with" the terminals 220 long
otally mnunted upon a- pin 284 in a 'switch-hous
ing 289 which is suitably mounted on the bracket enough to insure starting of the drive motor in
the reversed direction, the end of the plunger 288
|39. There is a bar 2|6 mounted on the blade
arm 286 and this arm carries a pairv oi' contact is formed with’a shoulder 248 andthe tip of the 75 75
lug or cam 266e is beveled Voii? as indicated at ' circuit of the machine as will be described morel '
242. As the cam' shaft 98 rotates, then, the cam particularly hereinafter, and stops the machine.
ñrst engages the end of the plunger- 288 pushing As the plunger 265 continues to move outwardly
the plunger far enough in to engage the teat 286 under actuation of the spring 266, the teat' 268
behind the plunger- 21d. 'I'hen in the continued Í clears v‘the plunger 256 and the spring pressed 5
rotation of the cam shaft, the cam 280 rides clear ‘plunger 260 operates again to close the switch.
of the end of the plunger and allows the plunger
A dash-pot is provided in conjunction with the
to move outwardly under actuation o§"the spring .plunger 268 so as to prevent the switch _being
233 causing the switch to _break contact with the
closed again> before the circuit to the controllers
10 terminals 2| 1 and make contact with the ter
of the machine has actually been broken. This 10
minals 220 but when the cam 288 rides clear of the ` dash-potcomprises a plate 218 (Fig. 18) which
end of the plunger 238, it engages the shoulder is secured between a shoulder on the stem of the
266 of the plunger and the ì)outward movement
plunger and the nut 21|. 'I'he plate 210 slides
in a chamber or recess 212 and has substantially
15 is halted. 'I‘he beveled portion 252 of the cam en- - air-tight engagement with the walls of this 15
gages theA shoulder 250 of the plunger for a long chamber. There are holes 213 through'the plate.
enough interval to assure «that the reverse drive Above the plate there is a disc 215 slidably mount- '
is started. Then the bevel portion 252 of the cam ed on the stem of the plunger and. having'a llm
280 rides clear of the shoulder 2&8 of the plunger ited movement thereon. When the plunger 260
20 and the plunger completes its movement to the .moves downwardly on the opening of the switch, 20
right under actuation of the spring 233, breaking air passes freely through the openings 213 in the
contact at the terminals 228 and making contact' plate 218 and the movement of the plunger is
' again at the terminals 2 i 1 in the manner already not restricted- but _when the plunger mores up.
wardly again to reclose the switch, the disc 216
The single blade switch which controls the rests on the top of the plate 218°closing the open-- 25
stopping of the machine comprises a body portion ings 213 and air is entrapped between- the plate
255 and a blade-arm 248 which is pivotally 218 and the inner' end’` wall of the chamber 212
mounted atv 251 on the body portion 255. The and so the upward movement of the plunger is
body portion 255 is pivotally mounted upon a pin retarded preventing re-closing of the switch un-30 248 in the switch box 268. The switch arm carries
til suiîñcient time has elapsed Ifor the controller to 80
a bar. 258`which is provided with contact points function and actually stop the machine.
252 and 253 (Figs. 7 and 18) that are adapted to
To prevent the lapping or burnishing com
make contact with terminals 255 (Figs. >18 and pound i’rom being sprayed about and to protect
25). v When contact oiî the points 252 and 258
the operator against injury during burnishing
35 víith the terminalsV 254 is broken, the machine
or lapping a guard is provided to enclose the gears 35
of the plunger under actuation of the spring 238
during the burnishing or lapping operations.
There is a spring pressed plunger 256 slidably This guard comprises a ñxed housing 280` (Figs.
mounted in the body portion 245 ofthe switch. 1 and 13) and a door or closure 282 that is piv- ,
A coil spring 258 is interposed between the plunger . otallyÍ mounted on the housing 288. The ñxed
s Ops.
40 256 and blade-arm 246 and serves to urge the i housing 280 is secured to the base 38 of the ma- 40
plunger downwardly and outwardly and the
blade-arm upwardly into Aoperative position. A
spring pressed plunger 268 is pivoted to the body
chinev in any suitable manner in position to en
close the gear and pinion‘being burnished or ‘
lapped as shownin Fig. 2. 'I‘he door 282 .per
portion 245- of the switchat 26|. This plunger is -. mits of access to the‘gears, removal of the gears
45 housed land slides in an opening 262 in the end
been completed and chucking of gears for a new
olf thä switch about its pivot 248 to hold the switch
A coil. spring 284, which surrounds this bolt, has 50
one end in engagement with~ the door and the
other end in vengagement with the ñxed housing
c ose
The body portion 245 of the switch is rocked in
a counter-clockwise direction 'to open the switch
by operation of a spring pressed plunger 265. This
55 plunger is housed in an opening in the end plate`
225 and slides therein.- It is pressed outwardly by
-a. coil spring 266 which -surrounds the stem ofthe
plunger and is interposed between a shoulder on
the plunger- and a cap-plate 261 which is secured
60 to the cover plate 225.
There is a teat 268' formed on one side of the
plunger 265 near the outer end thereof. This
- teat has a beveled end.
When the cam 20| en- .
gages the plunger 265_in the rotation of the cam
after theu burnishing or lapping operation has 45
plate 225 and is pressed' upwardly by the coil
spring 263 which surrounds the stem on the
spring presses the plunger up-wardly to normally rock the body portion 245
shaft 98, the lplunger is forced inwardly against
the resistance of the spring 266 and the teat 268
rides under ‘the plunger 256 which has a bev
eled tip complementary -to the beveled- tip of
the teat. When the cam 20| has rotated clear
70 ofthe end voi’ the plunger, the spring 2_68 forces
thel plunger outwardly again 'but at this time the
teatf268 _is engaged behind the plunger 256 and
so the switch is rocked about its pivot 248 caus
ing the contact points 252 'and 258 to be dis-en
75 gaged from the terminals 264. This opens the
The door 282 is pivotally mounted upon‘the
ñxed housing 288 by means of a pin orl bolt 283.
and serves to hold the door in any position to ,
which itis moved. A handle 285 is secured to the
door at one sidethereof to permit easy manipula- 55
tion of the door.
'I'he lapping compound is pumped ontopthe
gears by a pump shown in dotted lines in Fig. 1
which is driven by a motor 285'. The pump f
forces the lapping compound through the line 60
281 (Fig. 13) and the pipes 288 and 28,8, which are
secured in the housing 280 into an »elbow A288 -
(Figsl 13 and 14). T_he elbow '286 has one or
more openings _292 in it through which the lap- _
ping compound may drop into a funnel-shaped c5
receptacle 288. This receptacle ' is secured by
screws 284 to the door 282 _and it has a flexible _
hose 295 connected to it and leading from it; The
nozzleA 298 of this ñexible hose is held in abracket 1
291 that is vertically and horizontally adjustable 70
upona second bracket 298 which' -is ho
adjustable uponv'aI supporting 'plate )2 9. The
supporting plate 288 is clamped to ribs 388 formed '
on the door 282 by clamping-.gibs 882 and screws
388 andthe supporting'plate is >horizontally yad- 75
bracket 298 on the supporting plate 209.
The bracket 2914 is secured to the bracket 208
in any position of its adjustment thereon by
the bolt 304 which passes through the vertical
slot 305 in the bracket 291 and the horizontal
slot 306 in the bracket 298. The bracket -298 is
secured to the supporting plate 239 in any posi
tion of its adjustment thereon by bolts 308 which
pass through horizontal slots 309 in a projecting
portion 3|0 of the supporting plate.
fastened to the motor shaft of the pump, and the
belting 343 which connects the two pulleys.
Flexible hose 344 and 345 are connected to
opposite sides of the pump. The hose 344 is con
nected by an elbow 346 with a duct 341 formed
in one wall of the casing 330.' The duct 341 con
nects with a well 348 formed in the bottom of
the casing 330 (Figs. 9 and 11). There are two
parallel ducts 349 and 350 that lead downwardly
from this_well. The duct 349 communicates with
a duct 35| which is normally closed by a relief
valve 353. This relief valve is slidable in the duct
35| and in aligned openings formed in the bottom
of the casing 330. It is normally held in closed
position by _a coll spring 354, the tension of which
may be adjusted by the screw 355 whichvis oper
'I'he various adjustments described permit of
directing the lapping compound, when the door
282 is closed, onto the gears being lapped at the
most desirable point for the lapping process.
The portion of lapping compound pumped up
by the pump and which does not flow out through
the opening 202 flows on through the elbow 290
into a return pipe 3| 5 which carries the com
ated by the hand wheel 3,55.
pound past the gears and allows it to drop into
the bottom ofthe fixed guard 230 whence it is
' sump 360 when the valve is forced open by pres
wardly inthe h using 230 beyond the gears being
The valve 353 has openings 358 therein which
permit liquid to flow from -the ductl 35| into the
` returned to the sump of the pump system by
return pipe?
The pipe 280 is ordinarily
long enough so
at the pipe 230 projects for
is secured by screws 342 to the'housing 330 at
one side thereof. The pump 340 is driven from
the gear spindle 48 through a pulley 331 which
is fastened to the spindle, a pulley 339 which is
justable on the ribs 300 in a direction at right
angles to the direction of adjustment of the
Hence, when the door 282 is open, the
compound dripping through the openings 232 in
the elbow 2_90 simply falls into the bottom of the
30 fixed housing 280 and is‘also returned to the sump
sure of oil flowing into the'duct 35i through the 25.
line 344 from `the exhaust side of the pump 340.
When the line 344 is on exhaust, the duct 350
is closed by a ball check valve 33| that shuts off
communication between the duct 350 and a duct
362 which leads into the sump. When the pump 30
by the pipe 3|6.
340 is rotating in the‘oppeosite direction, how
in detail hereinafter.
check valve 36|, respectively. The two ducts
communicate, respectively, with the sump 360
To prevent the machine from being operated ever, and the line 344 is on suction, the valve
for a lapping or burnishing process without the' 33| is open and oil is drawn from- the sump 330
' y
door 282 being closed, a double-throw limit switch into the pump.
-The hose 345 connects with a duct 333 which
35 320 is mounted on the fixed housing 280. This
switch is so mounted that the roller 32| carried < is similar to the duct 341 and this duct connects
by its switch arm 322 must be engaged by the with a well which is similar to the well 348 and
flange of the door 282 to close the switch before from which there lead two ducts similar, respec- "
the motors 40 and 60, which drive the gears and tively, to the ducts 349 and 350 and closed re 40
spectively, by a relief valve and a ball check valve
. eilîect the burnishing or lapping motions, respec
tively, can be started vas will be described more' similar, respectively, to relief valve 353 and ball
For applying a load to the gears during testing,
a standard hand-brake may be employed such
45 as illustrated in the patent to Slade No. 1,796,484
above mentioned. It is manipulated by the lever
325 (Fig. 2). This brake will operate upon the
` brake-drum |84 (Fig. 3) but as the construction
_ of the same forms no part of the present inven
50 tion, it will not `be described in' detail here.
‘ To obtain a smooth, uniform motion'. during
burnishing or lapping and to prevent back-lash
between the gears accentuating the errors which
it is desired to burnlsh or lap away, it has been
55 found desirable lit practice on lapping and bur
nishing machines to provide a back-lash brake
which will exert a moderatepress'ure between
the gears throughout the whole of the burnish
ing or lapping operation. An improved form of ‘
60 back-lash brake has been provided upon the -pres-v `
ent machine and this will now be described. 330`
(Figs. 9 and 10), denotes a housing or sump which
is secured to the end or cover plate 332 of the
hand brake mechanism (Fig. 3) by bolts 334
65 (Fig. 10). The end plate 332 is secured to the
‘ guard 335 of the hand brake mechanism by screws
336 which thread into lugs formed integral with
this guard. The guard is secured to the spacer
member |80 by screws '338 which pass through
lugs in the guard and thread into the- spacer
member. The cylinder 33| which houses the
chuck-releasel iston 58 is secured to the housingn
330 by screws 333.y
A gear pump 340 of any usual or suitable cor.
is mounted upon a bracket 34| which
when the relief of-ball check valve, respectively.
are open. The hand wheel for controlling the
.Y tension of the relief valve associated. with the line
3451s designated at 335.
When the gear spindle 48 is rotating` in one
direction the pump 340 is so driven that it sucks
oil from the sump through the ball check valve 50
33|, ducts 350, wdl 348, -duct 341, elbow 346 and
piping 344 and it exhausts this oil through the
piping 345 and duct 363 and `a relief valve corre
sponding to the relief valve 353 back to the sump.
In thisv direction of rotation'` of the spindle, the
speed of rotation of the pump and therefore of
the spindle is determined by the adjustment of
the-hand'wheel 365 and of the relief_ valve con
trolled thereby. .Hence any desired load may be
applied to the spindle 43 when rotating in the 60
described direction.
Whenthe gears and .spindle 48 are rotating
fin the opposite direction, oil is sucked from the
pump 360 through a ball check valve >correspond
ing tothe ball check valve 33|, the vduct 333 and
the line 345 and is 1exhausted from the pump
through the line 344, duct 341, well 343, duct 353,
relief valve 353 and >the openings'338 inv that
valve back to the sump.
The rate of rotation of
the pump and of .the‘ spindle _48 is then deter
mined byy the adjustment of the relief valve 353
through the hand vwheel 353.y By the mechanism Y
described, then, any suitable l’òad can be applied
to the spindle 48 and to the gears being bur-A
rushed or lapped during rotation of the gears in
either direction. Pressure gauges 313 and 313’
are provided to permit determining the brake
.load in either direction accurately.
One of the features of the present machine is
the incorporation in the means for adjusting the
pinion head 3| of a. dial gauge to permit precise
adjustment of this head so that the pinion P
may be adjusted accurately into correct meshing
relation with the gear G for lapping or testing.
The pinion head 3| is adjustable by means of a
screw shaft 310 (Fig. 12) that threads into a nut
31| which is secured to the pinion head. The
shaft 310 has a. sliding key connection with a
sleeve 312 to which the hand wheel 314 is secured.
The pinion head is also movable -by means of a
piston 315 which is connected to a piston rod 315
and is slidable in a cylinder 395 that is secured
in any suitable manner to the base of the ma
chine. The piston rod 316 is connected to a yoke
amount of the backing-away movement may
be determined accurately by reading the microm
tion of mesh of one pair of gears, the settings of
the screw shaft so determined will do for any 20
pair of identical meshing gears and thereafter any
pair of identical gears may be brought into cor
rect depthwise meshing relation simply by inch
ing the piston 315 on to the limit of its movement
scribed-in Patent No. 1,881,999. As these valves
form no part of the present invention they will
not be described here.
Secured in any suitable manner to the yoke
member 318 is a plate 385. 'I'his plate has a hook
30 386 at one end. The hook is adapted to engagevl
the short arm of a magnifying bell-crank lever
381 that is pivoted at 388 on a guard 389 which is
secured to the base or frame 30 oi the machine.
The long arm of the bell crank lever 381' engages
in its cylinder. lIt is only necessary to make a
new precision setting when a _different ratio of
gears is to be lapped or tested.
For lapping, as has been described, _the gear
and pinion are rotated together in mesh andsi
multaneously the carrier 52 is oscillated to im 30
part an eccentric motion to the gear and the
quill 5| is reciprocated to `impart a depthwise
movement tothe gear. For testing, the gears
are simply run together in mesh and the oscil
at its tip with the contact point of a dial gauge 390
lating motion of the carrier and the reciprocating 35
motion, of the quill are'omitted. One way in'
which a combination lapping and testing ma
which may be of standard or any _suitable con
struction and which is> also mounted in the ‘guard
389. A glass°sight 392 is provided in the guard to
permit the operator to readily read the dial
chine may be wired to accomplish the purposes
oi' the present invention is illustrated diagram
40 gauge.
For precision lapping or testing, it is desirable i
to havev the gears being lapped or tested meshed
45 toming position of the -pinion in the gear, that
for the shaft 310 will rotate in the nut 31|. The
Having precisely determined the correct posi
control valve and an inching valve such as de
very accurately as to depth. This is done in the
left. This slight movement will be reñected
through the magnifying lever 381 to the dial
gauge and the operator will know immediately
that he has reached bottoming position. The
operator will then rotate the hand wheel 314 to
back the pinion away> from the' gear a pre-de
termined Vdistance to the point where the pinion
and gear will run accurately together, ordinarily
to the position where theyhave true pitch-line
mesh. In this backing-away movement, the 10
head 3| will be moved relative to the piston 315,
cylinder 395.
This yoke member
is connected through ball thrust bearings 319 and
380 and the nut 382 to the screw shaft 310.
The piston 315 may be operated by a rotary
present machine by first finding precisely the bot
eter dial 396. This dial is graduated t0 read’A
against a zero mark on the end plate 391 ofthe
20 member’ 313 by a nut 311.
' matically in Fig. 25. The lapping circuit will be 40
described ñrst.
At some convenient point on the machine
there are secured an electric start button 400
and an electric stop button 40| (Fig. 25). The
start button is a normally open button and the 45
is, the position in which the tops of the pinion stop button is a normally closed button. For
teeth bottom in the tooth'spaces of the gear and lapping, the door- 282 (Fig. 13) of the guard 280
by then backing the pinion outof bottoming posi
be‘closed before the machine can be start
tion the predetermined distance required until must
ed so that the switch 320 is in the position shown
50 -the pinion will run with the gear in the desired
in` Fig.. 25 with the bar 402 bridging the termi 50
depth-wise mesh relation.
403 and 404. 'I'he axial position of the shaft
To ñnd the bottoming position of theV pinion,v nals
99 must also be such that thepam |32 (Fig. '1) is
the teeth of the gear are aligned with the tooth inv engagement with the roller |35 so as to be
spaces of thëpinion and the pinion head 3| is able to' impart the oscillating movement tol the
inched on to the limit of movement ofthe piston carrier 52. In this position of the shaft, the
315 in "its cylinder 395 to engage the teeth and switch |96 will occupy _the position shown in 55
tooth spaces of the pair in mesh. The piston in Fig.
25 >with the bar 405`bridging the terminals
its movement carries the piston rod 316 and. yoke
408.- The_reversing switch' 205 will be in
member 318 with it and the yoke member car
the position shown in the Figs. 17 and 25 with the
ries the screw shaft 310, sliding this shaft inthe bar 2|5 and the contact points carried thereby 60
sleeve 312. Just before the piston 315 has reached
the terminals 2|1. The stop switch
its limit position, theV hook 386 on the plate 385 bridging
245 will be in the position shown in Figs. 18 and
will engage the short arm of the lever 331 and im
25 with the‘ bar 250 bridging the terminals 254.
` part movement to the contact point of the gauge
-When the operator presses the starting but
-65 390, which movement will be registered by 'the
ton 400 a circuit is made 'from the main line L1
Y gauge.
When the piston 315 has reachedV the through the line 4|0, the terminals 403 and 404 65
limit of its movement to the right, the operator andthe bar 402, theline 4|2, the line 4|3, the
moves the pinion head 3| on to bottom the pin
ion in the gear by rotation of the hand wheel line 4|4, the terminals 4|5 and 4|5 and the start
70 314. When the teeth of the pinion teeth actually' ing button 400, the line'4l8. the solenoid-coil
420, the line 42|, the line 422, the terminals 423 70
strike the bottoms of thetooth spaces of the and
424 and the stop button 40|. the line 425,V
gear, the shock will be transmitted back through the
terminals 254 and the bar 250 of the stop
the head 3|, nut 31| and screw shaft 310 and Aswitch
245,»the line 425;
terminals 421and »
will cause a slight deñection of the yoke member 428 and the bar 429 of thethe
reverse controller for
318. This will cause the hook 388 to move to the the main- drlve motor 4I of the
machine, the line 'I6
488, the terminals 431 and 482 and the bar 443 of l breaking contact of the bar 215 with the terminals
the forward control] r for the motor 48, the line , 211 and causing contact to be -made between the
435, the’ terminals 4 8 and 431 land bar 438 of a bar 218 and the terminals 228.
When contact of the bar 218 with the terminalsi
controller for the oscillating drive motor 68 (Fig.
'7), to the main line L2. This circuit energizes' 211I is broken, the coil 441 is de-energized; the 5
the coil 428 to close a two-pole normallyr open _ switch arms 4158, 461, 482, and412 open and the
relay 448.
main drive motor 48 stops. As soon as the con-l
As soon as the relay 448 is closed, a circuit is
made which energizes thev forward and oscillat
10 ing controllers.> The circuit to the forward con
troller is from the main line L1 through the line
\442, the terminals 443 and 444 and the bar 445 of ,
the‘relay 448, the line 448, the-coil 441 of the for
ward controller, the line 448, the line 422, stop but
15 ton 481 -and the lines previously described to the
main line L2. The circuit to the oscillating con
troller is made from the main line L1 through the
line 452, the terminals 453 and 454 and bar 455
of the relay 448, the line 456, coil 451 of the os
20 cillating controller, and lineI 458 to the line 448
and. thence through the line 422 and stop button
481 to`the main line L2 -inthe manner already de ~
êtact bar 218 makes contact,)however, with the
terminals 228, the main drive motor is re-started' ‘l
'but in therevers'e- direction.
through the line 418, the terminals 483, and 484
and bar- 482 of switch 328, the line 411, ter
minals 488 and 481 and bar 4116> of switch 185,
line 41?@line 413,. line 588, terminals _228 and bar
218 of switch arm 281, lines 581 and 582, coil
583 of the reverse controller line 584, Vand lines
448 and 422 through Vthe stop button 481 and the
previously described connections to the main line 21)
La. This energizes the coil 583 closing the switch
blades 585, 585 and 581 and also the switch blade
The energized coil 441 pulls the switch-blades
. 468„461, and 462 closed so that they make con
‘ .tact with the terminals 454, 455 and 465, respec
tively and close a circuit to the main drive motor
'48 (Fig. 1.) .through the forward controller and
the lines 468, 459, and 418. vThis starts the motor
30 48 driving the meshing pinion P andthe gear G
in the forward direction. At the same time that
the energized coil 441 closes the switch arms 468,
461 and 452 it also closes-.the switch arm 412.
The energized coil 451 closes the switch arms
CL3 CA 415, 416, and 411_and also the switch arm> 418 so
- that these _arms make contact, respectively, with
Theclosing of the '
contact of the bar 218 with the terminals 228
causes a circuit to be made from the line L1
The switch blades 585, 5856, and 581 make con
tact with the terminals 518, 511, and 5_12, respec 25
tively, causing the man1/drive- motor 4t to be
driven in the reverse direction through the lines514, 515, and 515.-
As already describedf the nose of the cam 288
contacts with the shoulder- 248 of the -plunger
238 (Fig. 17) only long enough to i ure restart
ing of the drive motor 48 in the reverse direc
tion. -Then the nose of the cam slips off of the
shoulder of the plunger and` contact of the bar
218 of the switch 285- with the terminals 228 is
again broken. The circuit to the coil 583 is main
the terminals 488, 481, 482, and 483 of the oscillat tained, however, from the line L1v through the
ing controller.> The closed. switch arms 415, 415, line 418, switch' 328, line 411, switch |85, line 412,
>and 411 make a circuit through the oscillating line 488, terminal 528, switch 588,'coil 583, lines
584, 448, and 422 and stop vbutton 481 and con 40
4.0 controller andthe lines 485, 486, and 481 to the
oscillating drive motorß68 (Fig. 7) and this motor < nections already described to the main line Le.
'I'he main drive motor 48 continues to drive
through the drive already described osciliates the
carrier 52 and reciprocates the quill 51lin the car
rier, thus imparting a combined eccentric and
415 axial motion to the gear G with reference to the
pinion P.
Now the start button 488 is a normally open
button. Therefore when the operator takes his
iinger off of the start button it flies open. This
breaks the circuit to the coil 428. The relay 448 v
is a normally open relay. Hence when the circuit
to the coil 428 is broken, the relay 448 opens. This
, breaks the described circuit to the coils 441 and
451, but the circuit to these coils is now main
55 tained through the switches 412 and 418, respec
_.-tively, and so the motors 48 and 88 aire not
The circuit to the coil 44'1 is maintained from
the line L1 through the line 418, terminals 484
60 and 484 and bar 482, line 41 I, terminals 488 and
481 and bar 486, line 412, line 498, line 491, ter
minals 492, switch arm 412, line 494, terminals 211
and bar 215 of switch >285, line 495, line 445, the
coil 441, lines 448 and 422, through the stop but
"ton 481 and the already described connections
to the mainline L2.
The circuit to the coil 451
is maintained' from the main line L1 through the
described connections with the lines 412 and 498,
the line 491, terminal 483,*switch 418,fline 498,
70 coill 451, lines' 458, 448 and 422 and stop button
481 through the already` described connections
to the main line L2.
The’described circuits to the main drive motor
48 and oscillating motor 68`are maintained until
gaf the cam 288 (Figs. '7 and 18) trips the switch 285,
the pinion P and gear G in the reverse direction
until the cam 281 (Fig; 18) trips the switch 2.45.
'I‘hen the circuit ~to the coils 583 and 451 through 45
the stop button 481 is broken and both motors
48 and 88 are stopped. This stops the machine
with its operations completed in one revolution
of the cam shaft 89. The stop switch 245 closes
again automatically but its 1re-closing is retarded l50
sufficiently by the dash-pot plate 218 to insure
`breaking of the circuit to the coils 583 and 451
and opening of the‘switch arms 588 'and 418.
Hence, on the re-closing of the switch 245, the
motors 48 and '88 are not restarted, nor can
they be restarted until the start button- 488 is
againvpushed in and when the start buttorr488 is y
again pushed in, the machine will go through its full
In order to use the machine for testing gears, 60
the camshaft 58 must be shifted amally by the
lever 153 (Fig. '7) to disengege the cam 132
from the roller 135 and bring the concentric disc
151 into engagement with this vroller for in the
testing operation, the gear G and pinion P are
run together -in` iìxed positions and >neither an
oscillating motion nor an axial mation or' the gear
is desired. In testing, also, the door- 282 of
the guard 288 (Figs. 1 and 13) will beopen.
When the cam shaft 841s shifted to engage 78
the roller 185 with the disc 181", 'the arm of the
switch 198 will be moved to cause the bar 485
of this switch to break contact with the ter
minals 481 and 488 and to cause the bar 525,0f
this switch to make contact with the terminals
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