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Jan. 7, 1947.
2,413,902
_ R. G. ALLEN
CAM ADJUSTING AND INDICATING MECHANISM
Filed March 27,. 1945
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CAM ADJUSTING AND INDICATING MECHANISM
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Jan. 7, 1947.
R. G. ALLEN
2,413,902
CAM ADJUSTING AND INDICATING MECHANISM
Filed March 27, 1945
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Jan. 7, 1947.
R. G. ALLEN
2,413,902
CAM- ADJUSTING AND INDICATING MECHANISM
Filed March 27, 1943
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CAM ADJUSTING AND INDICATING MECHANISM
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Jan. 7, 1947.
R. G. ALLEN
2,413,902
CAM ADJUSTING AND INDICATING MECHANISM
F'iled March 27, 1943
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Patented Jan. 7, 1947
2,413,902‘
UNITED STATES PATENT OFFICE
2,413,902
CAM ADJUSTING AND INDICATING
MECHANISM
Russell G. Allen, Alton, Ill., assignor to Owens
Illinois Glass Company, a corporation of Ohio
Application March 27, 1943, Serial N 0. 480,775
10 Claims. (01. 192—142)
2
1 .
My invention relates to apparatus for select
ing cams or other control devices, adjusting or
moving said devices from one position to an
other, and indicating the extent of such move
ment or positions of adjustment.
The invention in the form herein illustrated,
is particularly adapted for use with an Owens’
type machine for blowing hollow glass articles,
and is shown as combined with and forming a
part of such a machine. In a machine of this 10
type, charges of glass are drawn by suction into
parison molds and the parisons formed therein
are transferred to ?nishing molds in which they
are blown to the form of ?nished articles. A ma
chine of this type comprises stationary cams
mounted on the center column of the machine
and controlling various operations of the molds
and other parts of the machine.
The cams are
individually adjustable'for adjustably varying or
Fig. 6 is a section at the line 6-6 on Fig. 4.
Fig. 7 is a sectional elevation at the line 1—‘l
on Fig. 2.
Fig. 8 is a section at the line 8-8 on Fig. 4.
Fig. 9 is a sectional elevation at the line 9——9
on Fig. 4.
Fig. 10 is a sectional elevation of mechanism
shown on Fig, 8, viewed in a direction at right
angles to that of Fig. 8.
Fig. 11 is a sectional elevation of the cam se
lector, at the line II-—l| on Fig. 4.
Fig. 12 is a diagrammatic plan view of the dis
tributor with the cover of the casing removed.
Fig. 13 is a wiring diagram of the selector sys
tem, including the selector and distributor.
Referring to Fig. 1, the glass blowing machine
comprises a base 20 on which is mounted a sta
tionary center column 2|. A mold carriage 22
is mounted to rotate continuously about the col
timing the different operations. A machine of 20 umn. Stationary cam plates mounted on and
the above type is disclosed in United States Pat
surrounding the center column, include a cam
ent Number 2,269,391, granted in my name Jan
plate 24 on which is mounted an adjustable cam
uary 6, 1942, Machine for molding glass articles,
25 controlling the lifting and lowering movements
- which patent also discloses certain features of the
cam selecting and adjusting mechanism shown
in the present application.
An object of my invention is to provide a novel
indicating device in combination with the cam
selecting and adjusting mechanism, to indicate
of the ?nishing mold carrier, a cam plate 26 on
which are mounted adjustable cams controlling
the opening and closing movements of the ?n
ishing mold, a cam plate 21 on which is mounted
an adjustable blank mold opening cam 28, a cam
plate 3!) controlling the lifting and lowering of
the position to which a selected cam has been 30 the diphead, a cam plate 3! on the underside of
adjusted.
which is mounted a cam 32 for lifting and lower
A further object of the invention is to provide
ing the plunger, and on the upper side of which
‘an indicating mechanism which may be mount
are mounted cams 33 and 34 controlling respec
ed separately from the glass blowing machine,
tively the knife swing and the knife drop. Refer
either on the machine base or in any other de 35 ence may be had to the above mentioned Pat
sired position more or less remote from the ma
ent Number 2,269,391 for a description of the
chine, for indicating theextent' or position of
mechanisms through which the cams operate
adjustment of any selected cam.
Other objects of the invention will appear
hereinafter.
‘
'
"
Referring to the accompanying drawings:
Fig. 1 is a sectional elevation of one unit of an
Owens’ type glass blowing machine to which the
present invention ‘is applied.
Fig.2 is a sectional plan view of the cam select
ing and adjusting mechanism mounted within
the center‘columnof the machine.
Fig. 3 is an elevational view of the electrical
distributor.
T
.
.
.
-
Fig. 4 is a sectional plan‘view, substantially at
the line 4-4 on Fig. '7, showing the series of cam
the various parts controlled thereby.
The cam selecting and adjusting mechanism,
40 for the most part, is mounted within the center
column 2| of the machine. Such mechanism
includes adjusting units, each comprising a ver
tical cam driving spindle 35 (Figs. 2 and 7) said
spindles being arranged in an annular series con
' centric with a selector cam shaft 36.
The cam
shaft is journalled in a gear casing 31 through
which the spindles 35 extend and in which they
have journalled bearings. The spindles 35 are
individual to the various cams and other devices
on the blowing machine which are to be selec
adjusting spindles, the cam selector, and the in
tively operated by the spindles.
Referring to Fig. 1, the spindle 35 which oper
dicator.
ates the cam 25 has operating connection there
3
with through a train of gears including inter
Fig. 5 is a sectional elevation of the indicator,
the section being at‘the line‘5—-5' on Fig. 4.
55 meshing beveled pinions 38 mounted on the shaft
2,413,902
3
4
driven by the selector motor 43. The driving
connections include the shaft 49 (Fig. 7) of the
Geneva drive, and bevel gears 15 by which the
intermittent motion of the shaft 43 is imparted
to a' drive shaft ‘H extending upwardly and con
35 and a horizontal shaft 39. The shaft 39 has
driving connection through a worm drive 40,
pinion 4|, and rack 42, with the cam 25. Similar
driving connections (not shown) are provided
between the other spindles 35 and the respective
nected to the cam shaft 15. The cam 14, when
cams.
rotated, operates through tappets 13 to move the
contacts 13 in'successionginto"engagement with
The Spindles 35 are selectively driven by a
spindle driving .motor 85 (Fig. :2) operating
the contacts 12. Each step movement of the cam
scribed. Selective mechanism for operatively 10 operates to close a switch ‘H and hold it closed
while all the other contacts remain open, each
connecting any selected spindle 35 with its driv
switch, however, being closed just before the
ing motor 85, includes a selector motor 43 (Fig. 2),
preceding switch is opened.
under the control of the manual selector 250.
The selector motor 43 (Fig. 13) is driven by
The shaft 44 of the motor 43 has driving connec
'current'from a'power line including the mains
tion through a worm and worm ‘gear 45 (Fig. r7) "
through a train vof gearing as hereinafter v‘de
-80 ‘and 8 I. The‘main 86 is connected to a contact
brush 82 which bears on the ring 59. The con
with a shaft 46. A Geneva drive includes a driving
element 41 keyed to the shaft“; :and a-Geneva
wheel 48 which is keyed to a horizontal shaft 49.
tacts 68 are connected respectively through wires
83 to the corresponding stationary contacts ‘l2
to the shafts 49 and 35 respectively. It will be 20 of the distributor. The movable contacts "E3 of
‘the‘distributor- aretallconnected through a con
seenl‘that rotation ofthe motor -"43 will impart
ductor83a to one'brush of the motor 1.43,.the other
intermittent step ‘by step rotation *‘to the cam
brushbcing connected directly to the main 3 1.
shaft 36. The angle through which the cam shaft
With theiparts in the position asshown in
is rotatedat'each-stepmovement is equal to the
Fig.
13, the motor~43fisr at'rest as allthe switches
angular - distance between adiacent ‘tspin'dles 135.
‘H are open-except the'uppermostone held ‘closed
The gearing through which the motor‘88 oper
by the cam 14, and the circuit-leading through
ates to drive the spindles'35, includes a train of
said-‘closed switchto themain-B?, is held open
planetary gears comprising a'sun gearY52 rotatable
at the insulating‘section'l?. .When it is desired to
on the shaft 36 and operating‘ through idler gears
operate one of the "cam adjusting zspindles 35,
'53 to drive pinionsi54‘which areindividual to
‘the operator rotates the selector knobt? (Fig.4)
and mounted for rotation :on ‘the ‘spindles '35.
.to. a position in which a legendr84 corresponding
The 'gears‘f54 are selectively connected to the
to‘the selected spindle, is ‘brought opposite a
spindles iby clutches, each'including a‘ ‘clutch
pointer 85. The rotation of the knob ‘iii! moves
"member 7 55 splined ‘ on 'i the spindle and movable
the insulating patch 10 oif the- contact "88 which
vertically thereon into'and out of driving en
'is‘in circuit with the closed switch -‘H, thereby
gagement with'theipinion '54. 'The means for
Intermeshing bevel gears 50 and 5| are ‘connected
establishing a circuit ‘for the motor v43. The
‘operating the ‘clutches includes a selector cam 56
vmotor
is thus started and'operates through the
keyedtothe camshaft 136 and having a cam
Geneva'drive (Fig. '7) to rotate the distributor
"track 151 on its underside. ~Bell cranks 58indi
‘vidualv'to‘the ‘spindles 35,'each’comprises an arm 40 'camH'step by step until. it'closes‘the switch ‘H
corresponding ‘to ‘theselected spindle.- As the
1having'a‘roll running on the ‘cam track and an
manual adjustment of the indicator knob has
positioned theinsulating patch 19 over the con
tact 58in circuit 'withsaid closed switch, the
motor is stopped when-the ‘cam 14 reaches a 130ST1~
tion to close said switch,'as all the other switches
"'spindles'35-an'd their respective gears '54, each
are then open. ‘The-clutch operating cam 56,
clutch being disconnected before the ‘next suc
which is driven in'synchronism with the dis
ceeding 'clutch'is operated.
tributor cam, is nowin a position in which it
The operationxof 'the'motor ?43 is under the
c'ontrol'of the manual selector 60 and aidistributor 50 holdsvclosed the clutch-for ‘the selected spindle
35.
'6’! 'connectedin'the ‘control'circuits for the motor
.The spindle drivingmotor 86 may now be oper
543. ‘Such-selectorand distributor, device‘ are sub iatedxfor. rotating the‘ selected spindle. The motor
*stantially the ‘samevas those 'shown'in :Patent
86 ‘has adrivingconnection with the selected
‘Number 2,336I830,'granted' in myname, December
'arm-engagingithe clutch member 55.‘ The cam
'track5’51 is so designed that as the'cam rotates,
theclutches are operated singlyiand‘ in succes
1sion' to ‘effect driving connection between the
14, > 1943, for-"Selectiveicontrol: mechanism.
The selector'BB ‘(Figsséq l1, and‘13) comprises
(31 L1
~aIcasing‘including-a rotatable knob 64 and
?xed section ‘62‘which is 'secured‘to a ‘bracket
or support ~63 mounted on‘the machine'base or in
anyiconvenient position relative to the blowing
‘machine. The knob I54‘is rotatable on a stud
'65-'on1-an insulating block '66 secured by bolts
=61 within the'member 52. An "annular series of
spring-pressed electrical ‘contact blocks 58 are
mounted in ‘the insulating ‘block 66 ‘and ‘bear
against afcontact ring 69 mounted in the knob
64. The "'ring469 carries’an insulating block. or
section 110 whichyas the‘ ring is rotated, insulates
‘the contacts ‘68in vsuccession'from‘the ring 58“
‘ The distributor 6i (Figsh'l,v 12, and’ 1.3)1 includes 7
an annular series 'of switches ll individual to
‘the cam ‘driving spindles 35, each said switch
including a stationary contact 12 (Fig. 13) and
‘a movable ‘contact ‘13. The distributor includes
‘the cam vl4 connected to -a shaft ‘15 which is
spindle through‘agear train including a sprocket
chain 81 (Fig.‘2),.sprocket wheel .88 (Fig. 7),
shaft ‘89,'bevel pinion?ll, and-a bevel gear 9!,
the latter secured to a-tu-bular shaft 92 mounted
to rotate freely on the shaft 38, the sun gear
52 being ?xed to the shaft 92. The operator may
start'thezmotor 86 in either direction by depress
ingronetof the push ‘buttons 93 (Fig. 4) in the
motorcontrol:circuit. Themotor then operates
through the gear train ‘just described, to‘rotate
~the ~selected .Lcam driving aspindle 35, ‘thereby
effecting the adjustment 'of the :selected cam.
The motor 86 continues to :run "while the push
button '931isheld ‘closed; so that the operator may
adjust the cam to any desired extent.
Indicating mechanismgnow‘to ‘be described,in
:cluding ‘.an‘ indicator :95 (Figs. ‘.4 . and, 5) ,is ; pro
videdi'for .indicating‘the position to whichany
selected cam is adjusted. Referring to'Figs. 7
'and'8, thelower :end portions of some or vall of
7,5 the.spindlesv35 extendathrough openingsin a
2,418,902
5
6
stationary horizontal plate 96 and have secured
and the dial. Such connections include a pinion
to their lower ends, worm gears 91. Each said
I35 (Figs. 6, '7, and 9) running in mesh with gear
worm gear runs in mesh with a worm wheel 98
teeth I36 on the gear I2I. The pinion is keyed
on the outer end of a horizontal shaft 99 which
to a shaft I31 journalled in the bracket II5, said
is mounted in a bracket I00 on the lower face of
shaft being coupled to a ?exible shaft I38 which
the plate 96 and extends inwardly from the
extends through a ?exible casing. I39 to the in
spindle toward the axis of the shaft 35. The
dicator and is coupled at its upper end to the
inner end of each shaft 99 has secured thereto a
shaft I32 (Fig. 5). When the air motor H8 is
bevel gear IOI running in mesh with a bevel gear
operated to rotate the shaft I I3 and lift the con
I02 which is internally screw-threaded and runs 10 tact arm I I I into engagement with a stop rod
on a, vertical screw-threaded stop rod I03. The
I03, motion is imparted through the train of gear
latter is free for up-and-down movement in a
ing just described and rotates the dial to a posi
bearing sleeve I04, but is held against rotation by
tion corresponding to the position to which the
a pin or lug I05 which enters a vertical slot I06
selected cam has been adjusted. Such position
in the stop rod. It will be seen that rotation of a
is indicated by the graduations I33 on the dial.
spindle 35 operates through the gearing, just de
A switch I40 (Figs. 9 and 13) in the main cir
scribed, to move the stop rod I03 up or down to a
cult of the motor 43, is normally held closed by
position determined by the extent of rotation of
a contact piece IllI on the gear I2I. When the
the spindle and therefore to a position cor
piston motor H8 is operated, the contact MI is
responding to the position to which the cam has
withdrawn and the switch opened. This prevents
been adjusted.
operation of the motor 43 while the motor 86 is
As shown in Figs. '7, 8, and 10, the cam shaft 30
running and driving the spindles 35.
has attached to its lower end, a shaft or extension
The operation will be understood from the fore
I01 which is journalled in a bearing sleeve I08
going description, but may be summarized as
mounted in the plate 96. Slidable up and down
follows:
on the sleeve I08, and shaft M1, is a sleeve I09
When the operator desires to adjust any par
which has a splined connection I In with the shaft
ticular cam on the blowing machine, he rotates
I01 for rotation therewith. A stop arm III
the selector knob 60 to bring the legend 84 (Fig.
formed on said sleeve I 09 projects laterally there
4) corresponding to the selected cam, into line
from, and as it is rotated, is brought directly be 3O with the pointer 85. This establishes a circuit
neath the stop rods I03 in succession, and is ar
for the motor 43 (Fig. 13) so that the latter is
rested in alignment with a stop rod at the com
started and rotates the distributor cam 14. The
pletion of each step movement. The sleeve N19 is
motor circuit is broken and the motor stopped
lifted and lowered by means of a forked arm 5 I2
automatically when the cam closes the switch 'II
keyed to a horizontal rock shaft H3 journalled
in bearing brackets I I4 and I I5 on the underside
which is in circuit with the particular contact 68
which has been insulated by the segment ‘I0. The
motor :13 during this run, operates through the
of the plate 96. The shaft H3 is rocked in a
direction to lower the stop arm III by means of
a coil tension spring IIB attached at one end to
a rock arm “1 on the shaft and at its other end
anchored to a bracket on the plate 96.
Means for rocking the shaft H3 in a direction
to lift the stop arm HI, includes an air-operated
piston motor H8 comprising a vertically recipro
cating piston H9 and piston rod I20. A gear
wheel I2I, keyed to the shaft H3 is formed with
Geneva drive 41, 43 to rotate the selector cam
55 and thereby operates the clutches 55 in suc
cession, so that when the motor is stopped, the
clutch for the selected cam driving spindle 35 is
in closed position. The operator now presses one
of the buttons 93 for starting the motor 35 in
either direction, depending on whether it is de
sired to adjust the cam forward or backward.
The motor 86 operates through the planetary
gearing 52, 53, and 54 to drive the selected spindle
the piston rod. When the motor piston H9 is
35, thus adjusting the cam. The extent of adjust
lowered, it operates to rotate the shaft H3 in a
ment is determined by the length of time the
direction to lift the stop arm III into contact 50 switch button 93 is held closed. The spindle 35
with the stop rod I03 in register therewith. Air
operates to move the associated stop or rod Hi3
under pressure for operating the piston motor is
up or down. When the motor 86 is stopped, or
supplied through a pipe line I23 under the control
while it is still running, the operator pushes the
of an electromagnetically operated valve I24 (Fig.
button I25 (Fig. 4) and closes the circuit for the
7) in said line. The operation of the valve I24 ~ electromagnetic valve I214, thus opening he valve
gear teeth which mesh with rack teeth I22 on
is manually controlled by means of a push but
ton I25 (Fig. ll) in a control circuit for the elec
tromagnet. A needle valve I26 (Fig. 9), is ad
justable to control the rate of flow of air to the
motor cylinder and thereby control the speed of 60
operation of the motor.
’ The indicator 95 (Figs. 4 and 5) comprises a
dial I2‘I mounted on a horizontal shaft I23
journalled for rotation in the indicator casing
Keyed (i5
I29 which is mounted on the standard 63.
to the shaft I28 is a bevel pinion I30 driven by
a'gear I3I keyed to a vertical shaft I32 journalled
in the casing. The dial I21 has graduations or
scale markings I33 which are visible through a
window I34 to indicate the position to which the
dial is rotated.‘
'
a
The dial is rotated to a position corresponding
to the adjustment of any selected cam, by the
rocking movement of the shaft H3, transmitted
through driving connections between the shaft
so that the piston motor H8 is operated. The
motor I Hi lifts the stop arm. I I I into contact with
the stop rod E63, and at the same time operates
the indicator to a position determined by the
stop position of the arm III, thus indicating the
position to which the selected cam has been ad
justed.
Modi?cations may be resorted to Within the
spirit and scope of my invention.
I claim:
1. The combination ofga plurality of adjusting
units, a stationary support in which said units
are individually mounted, a selector device mov
able to positions individual to said units for se
lecting said units, means separate from the selec
tor device for operating a selected unit, an indi
cator, automatic means for operating the indi
cator to a position determined by the extent of
operation of said selected unit, and manual
means for bringing the said indicator operating
12,413,902
7
means :into activity 'an'd‘effecting its operation
aftersaid operation. of the selected unit'has been
completed.
‘:2. The combination of a plurality (if-adjusting
units, a motor, selective means for effecting a
driving connection betweenthe motor and a se
lected unit, an indicator,‘mechanism for driving
the indicator, a stop device movable to operative
positions individual to said units, automatic
means for moving the stop device'to the said op
erative position individual to the selected unit,
and means cooperating with the said stop device
8
‘driving connections'between the 'motor and‘the
spindles, a stop device connected for rotation
with said clutch operating device, an indicator,
means for moving saidindicator, and means c0~
operating with said stop'devioe'for arresting the
indicator in a position determined by extent of
rotation of a selected spindle.
'7. The combination of vertically disposed ad
justing spindles, a motor, 'a'gear train oper
10 atively connected to the motor and comprising
gears individual to said spindles, a selector cam,
means for rotating the cam about a vertical axis,
clutches ‘individual to the spindles and operable
to connect said gears with their respective spin
dles for rotating the spindles, means operated
by said cam for actuating the clutches singly
and in succession, stop rods individual to said
spindles, means actuated by .the spindles for
moving the stop rods to positions corresponding
selector device and operable automatically to
effect a driving connection between said ‘motor 20 to the extent of rotation of the spindles, a stop
device connected to rotate with said cam-and
and a selected unit for driving the latter, a stop
thereby be brought into register with saidrods
device movable to predetermined "positions'indi
in succession, .an indicator, an actuator vfor
vidual to said units, means operable automatically
moving the indicator and stopdevice, and inter
to move the stop device and bring it to rest at the
connected mechanism between the said actua
said position individual to the selected unit, an
tor, indicator, and stop device for moving the
indicator, mechanism for actuating indicator,
indicator and the stop device and causingthem
and means actuated by said stop device for ar
to be arrested by said Stop rod.
resting said mechanism at a position determined
8. The combination of vertically-disposed ad
by the extent of operation‘of said selected adjust
justing
spindles, a motor, agear train operatively
ing unit.
connected to the motor and comprisinggears
4. ‘The combination of an annular series of
individual to said spindles, a selector cam, means
adjusting spindles, clutches individual to said
to ‘arrest the indicator in a position determined
by‘ the extent of movement of said selected unit.
3. The combinationv of a plurality of adjust
injg units, a power motor‘ for ‘driving said units,
a manual selector device movable to positions in
dividual to said units, means controlled by said
spindles; a cam, means providing operating con
nections between the cam and clutches, a motor,
means providing driving connections between the
motor and said cam‘for operating the cam inter
for rotating the cam about a vertical axis,
clutches individual to .the spindles and operable
to connect said gears with theirrespectivespin
dles for rotating the spindles, means operated
by said cam for actuating the clutches singly and
in succession, stop rods individual to said-spin
clutches in succession, a second motor, gearing
dles, means actuated by the spindles for moving
driven by said second motor, said clutches being
operable to connect the driving spindles singly and 40 the stop rods to positions corresponding to the
extent of rotation of vthe spindles, a stop device
in succession‘ to said second motor through said
connected to rotate with said'cam and thereby
gearing, an indicator, means for driving said
be brought intoregister with saidrods in suc
indicator, a stop device operatively connected to
cession, said stop device being movable into and
said-?rst mentioned motor and movable thereby
out of contact with the registered ,stop,r,od,:an
to positions individual to said spindles and
indicator, a motor for driving theindicator, and
brought to each said position as the correspond
means interconnecting the indicator and the said
ing spindle is connected ‘by its clutch to said
stop device for causing the indicator to be ar
second motor, and means cooperating with said
rested in a position corresponding to andde
stop vdevice for arresting the indicator in a posi
termined by the position at which‘ the stop device
tion determined by the extent to which'the se
contacts with a stop rod.
lected spindle has been driven.
9. The combination of an adjusting spindle,
5. The combination of a vertical shaft, an
means forrotating it, a stop rod mounted sepa
annular-series of adjusting spindles surround
rately from said spindle, meansproviding driv
ing said shaft, a gear train of interconnected
ing connections .between the spindle and'stop rod
gears including'gears individual‘to said spin
for causing the spindle to move the stop rod as
dles, a motor for driving saidgear train, means
the spindle is rotated, a rock shaft, means for
for'rotating said shaft, means operable by said
rocking it, a stop device mounted for movement
shaft to connect said individual gears singly
toward and from the stop rod, means providing
and in succession to said spindles, permitting
an operating connection between the rock shaft
the spindles to be rotated by said motor, selec
and said stop device for causing the'rock shaft
tive means operable automatically to stop said
to move said stop device into‘contact .with the
shaft when a selected spindle is connected for
stop rod and thereby arrest the rock shaft at a
rotation, an indicator, mechanism 'for driving
position determined by theposition of the stop
the indicator, a stop device connected to said
rod, an indicator, a support on-whichtheindi
shaft and movable thereby to a position corre
cator is mounted independently of the .rock
sponding to the position of the selectedspindle,
shaft, and means providing operating'connec
and means cooperating with said stop device for
tions between the rock shaft and the indicator
arresting the indicator in a position determined
and operative to move the indicator in synchro
by the extent to which the selected spindle has
70 nism with the movement of thei'rock shaft.
been rotated.
10. The combination of an adjusting spindle,
6. .The combination 'of 'vertical spindles,
means for rotating the spindle, a screw-threaded
clutches individual to the spindles, a motor, a
stop rod mounted separately from'vsaid spindle,
clutch operating device rotatable about a verti
gearing providing driving connections between
cal'a'Xis and operable to connect the clutches in
mittently step by step and thereby operating said
succession .to the spindles, and thereby effect
said . spindle and rod :for a rotating ' the latteras
2,413,902
the spindle rotates and thereby adjusting the
rod to a position determined by the extent of ro
tation of the spindle, a rock shaft, means for rock
ing said shaft, a stop arm, means operated by
said rock shaft to move the stop arm into en~
gagement with said stop rod and to thereby ar
rest the rock shaft in a position determined by
16
the adjusted position of the stop rod, an indi
cator mounted separately from said rock shaft
and spindle, and means actuated by the rock
shaft for moving said indicator to a position cor
responding to the stop position of the rock shaft.
RUSSELL G. ALLEN.
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