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Патент USA US3096418

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July 2, 1963
G. D. BROCK ETAL
3,096,408
SEQUENCE CONTROLLER MECHANISM
Filed Sept. 26, 1961
/40
l
//H
2 Sheets-Sheet 1
July 2, 1963
G. D. BROCK ETAL
3,096,408
SEQUENCE CONTROLLER MECHANISM
/45
/l
United States Patent O ” ICC
1
3,096,408
Patented July z, 196s
2
together with further objects and advantages thereof, may
3,096,468
SEQUENCE CONTRÜLLER MECHANISM
best be understood by reference to the following descrip
_
George D. Brock, Sterling, and Ernest W. Topping,
Lyndon, Ill., assignors to General Electric Company, a
corporation of New York
Filed Sept. 26, 1961, Ser. No. 140,731
10 Claims. (Cl. 2041-38)
tion, when taken in conjunction with the accompanying
drawings, in which:
FIG. l is a rea-r view of our improved sequence con
troller with the rear support plate partially broken away
to show the manually operated switch actuating arrange
ment and positive stopping lever;
This invention relates to sequence controllers, and more
FIG. 2 is a bottom view of the improved sequence
particularly to a mechanism for operating a plurality of 10 controller partially broken away Aand partially in section
electric switches in accordance with a predetermined
along line 2--2 of FIG. l to show some of the cam
sequence or pattern.
members and followers operated thereby;
An object of this invention is to provide a novel and
improved mechanism for operating a plurality of switches
tially broken away to show the `driving mechanism for the
or similar control devices in a predetermined manner.
Another object of this invention is to provide a sequence
controller for operating a plurality of electric switches,
wherein `an improved manually operable actuating means
FIG. 3 is a front view of the sequence controller par
15 switch operating unit and other pertinent structure;
FIG. 4 is a fragmentary perspective view showing the
interrelationships of the cam shaft, ratchet wheel, manu
ally operated switch actuator assembly, and positive stop
operates one of the electric switches.
ping lever, with the cam shaft being represented in its
An additional object of this invention :is to provide an 20 undepressed or outermost position; and
improved sequence controller which includes a novel
FIG. 5 is a view similar to FIG. 4, with the cam shaft
means for positively positioning a rotatable switch actuat
being represented in its depressed ‘or innermost position.
ing unit in a predetermined starting position.
Referring in detail to the drawings and in particular
It is a still further object of this invention to provide an
at first to FIGS. 2-3, there is shown a sequence controller
improved sequence controller mechanism for electric 25 1 having a suitable timing motor 3, an intermittent drive
switches, which mechanism is relatively small in size, com
pact, and due to its relative simplicity may be manufac
mechanism 5, a main rotatable switch operating unit 6,
and switching mechanisms 7 and 8. Motor 3, as illus
tured at a reduced cost.
trated, is of the self-starting synchronous type, and it
In carrying out the present invention, in one form
transmits rotary motion from ‘output pinion 9 at the
thereof, there is provided a sequence controller mechanism 30 desired number `of revolutions per minute for drive mecha
having a timing motor and a plurality of switches. One of
nism 5 to intermittently rotate switch operating unit 6
these switches may be a line :switch for controlling the
)and thereby actuate switching mechanisms 7 and 8.
timing motor. To operate these switches in a time driven
For supporting and containing the various elements of
sequence, a plurality of pivoted followers are distributed
sequence controller 1 in a compact housing, as shown in
35
ion the periphery of a cylindrically configured rotatable
FIGS. l and 3, the controller includes a rectangular switch
operating unit. The operating unit is intermittently driven
casing 11 formed by front and back plates 13 and 15,
by the timing motor, and it includes a plurality of cam
respectively, terminal boards 17 and 18, land spacer plates
members stacked together in coaxial fashion. Each fol
21. More particularly, the front and back plates 13 and 15
lower is operated by one or more radial interruptions
have rectangular slots 23 (shown representatively on front
formed in an associated track of one of the cam members, 40 plate 13 in FIG. 3) formed therein near their elongated
to actuate one of the switches. For setting the switch op
‘outer sides. The slots 23 receive and cooperate with mat
erating unit, a cam shaft is extended coaxially through the
ing rectangular bosses 25 projecting edgewise from op
unit. This cam shaft is keyed to the operating unit for
posite elongated sides of the terminal boards 17 and «18
manually rotating it, and the shaft is also arranged to
(FIG. 3). It will thus be seen that terminal boards 17
reciprocate between two positions relative to the unit. 45 and 18 serve structurally as elongated sides for casing 11
Near an inner end of the cam shaft, there -is formed a
(FIG. 3) and help to `space front iand back plates 13 and
frusto-conical camming surface. When the cam shaft is
15 apart in parallel fashion. For rigid securing the front
depressed, this conical cammi-ng surface acts upon a
and back plates 13 and 15 in cooperative engagement with
V-shaped surface of an actuator to move this actuator
terminal boards 17 and 1S, spacer plates 21 are staked to
50
transversely relative to the axis of the cam shaft ‘and
the outer faces of the front and back plates to secure these
thereby open the line switch. The line switch may thus be
parts «of the casing together (FIGS. l and 3).
readily turned olf before advancing the rotatable switch
Timing motor 3 is attached to the front side of back
operating unit.
plate 15, 4as shown in FIG. 3, by means of screws 27
For initially positioning the operating unit at a precisely
which extend through appropriate apertures of ears 29
located starting position, «a spring biased latching lever is 55 -of the housing 31 of the motor. Screws 27 thread into
mounted near the line switch actuator at one end of the
unit. A positioning notch is formed on a face of the
rotatable unit near the lever. The lever has a latching
engagement with apertures (not shown) of the back plate
hereinafter, and the `specification concludes with claims
particularly pointing out and distinctly claiming the sub
gear 37.
15 to attach the timing motor thereto. The pinion 9, as
shown in FIG. 2, is `disposed rearwardly or on the outer
tooth spring biased for movement into engagement with
side of back plate 15. A rear support plate 30 is dis
60
the notch of the unit when the cam shaft is depressed and
posed in parallel relationship to back plate 15 and suit
the unit is thereupon rotated to the desired starting posi
ably fastened thereto (FIG. 2). Pinion 9 of motor 3 is
tion. With such an arrangement, depression of the cam
positioned between plates 15 and 30, as shown in FIG.
shaft thus turns oil the line switch before advancement of
2 `and is in mesh with gear 33. Gear 35 is attached to
the switch ioperating unit and at the same time positively
the same shaft as gear 33 and is rotatable therewith.
65
>positions a stop to insure the commencement of the
The combination of gears 33 and 35 provides a reduction
sequence at a precisely located starting position.
gearing means for reducing the speed of angular rotation
Further aspects of our invention will become apparent
provided by motor pinion 9. Gear 35 meshes with crank
`Crank gear 37 is attached to a shaft 38 which
is journalled at its outer and upper end (FIG. 2) to sup
ject matter which we regard as our invention. The inven 70 port plate 30. Auxiliary gear 40 is also attached to shaft
tion, however, as to organization and method of operation,
38 and arranged coaxially upon gear 37. The purpose
aosenos
4
of auxiliary gear 40 shall be set forth hereinafter.
The
ratchet wheel 65.
All of the cam members 69 are simi
inner end portion 33* (FIG. 3) of crank gear shaft 38
lar to each other and have a cylindrical bore 71 (FIG.
resembles a crank pin in that it is eccentric to the 'axis of
crank gear 37 and `the outer end of shaft 33. The pur
pose of eccentric `inner end portion 39 of the crank gear
3) which is centrally located and extends generally per
pendicularly between top and bottom ends thereof. The
bores 71 surround and receive cam shaft 73 after the
various cam members have 'been stacked one upon the
other and fastened together in a suitable manner. Each
shaft 33 shall now be described.
For an understanding of lthe purpose and operation of
of the cam members 69 includes a pair of frusto-conically
stepped annular cam tracks 75 and 77 (FIG. 2) which
attention is drawn to FIG. 3. As shown therein, a lock
ing lever 41 is pivotally mounted on the inner side of 10 have radial discontinuities 79 formed thereon. The cam
tracks 75 and 77 act upon associated pivoted followers
back plate 15 by rivet 43. Lever ¿i1 serves a 11o-back
81 and 33 (FIG. 3) during the intermittent rotation of
function for the intermittent drive mechanism 5. More
operating unit '6, to control a plurality »of switches.
particularly, the lever 41 includes hooked ear 45 which
To provide a means for efficiently actuating the switch
is connected to an associated hooked end of coiled ten
Sion spring 47, `circular aperture 49 which is larger in 15 ing devices of the `sequence controller 1 within a relatively
small spacial area of the controller housing, -two opposite
diameter than a disc~shaped portion 51 of crank shaft 38
ly disposed groups of the pivoted »followers 81 and 83 are
and generally surrounds it, and outer tooth-shaped lock
utilized. (See FIG. 3.) One of these groups is disposed
ing end 53. Between the outer extremity of the eccentric
about `an axis parallel to cam shaft 73 on each side of
portion 39 and disc portion 51, a driving pawl 55 is
rotatably journalled upon eccentric portion 39 (FIG. 3). 20 the main switch operating unit 6. More particularly,
shafts 85 and 86 are each suitably positioned through
More particularly, eccentric portion 39 of the crank gear
eccentric inner end portion 39 of the crank shaft 33,
apertures in front plate 13 and back plate 15 on each
shaft 38 is extended through an appropriate aperture
side of unit 6. These shafts extend outwardly toward
formed in pawl 55, and a C-shaped clip 56 is fitted into
support plate 3i) from back plate 15 (as shown in FIG.
engagement with portion 39 to retain the pawl in its
proper axial position thereon. Pawl 55 also includes 25 5). The followers 81 and 8a3 resemble each other in
over-al1 appearance but differ slightly from Ieach other
notched arm 57 and tooth-shaped driving end 59. The
structurally, in that the cam engaging points 81a of fol
notched arm 57 is hooked into engagement with one end
lowers 81 are thinner in configuration than the cam en
of tension spring 61.
gaging points 33a of followers 83. The thinner cam
As further shown in FIG. 3, locking lever spring 47
has its one end attached to hooked ear 45 of lever 41 30 engaging points 31a are thus specially adapted to ride
upon cam track 75 (FIG. 2), which has a general diam
and the other end attached to lanced tab 63 of back plate
eter smaller than the general diameter of cam track 77
15. Spring 47 runs in tension to continuously bias lock
(FIG. 2). The cam engaging points 83a ride upon cam
ing lever 41 in a clockwise direction about rivet 43 (view
tracks 77 (FIG. 2).
ing FIG. 3), and thereby urges locking end 53 of the
Considering further the arrangement of the cam fol
locking lever toward ratchet wheel 65. Spring 61 of 35
lowers 8.1 and 33 on shafts 85 and 86, as shown in FIGS.
the driving pawl 55 has its one end aflixed to notched
arm 57 of the pawl 55 and the other end attached to a
2 and 3, the followers >are stacked on each shaft in alter
latching lever which serves an important setting function
in the controller. This latching lever and the operation
thereof shall be described in detail hereinafter. The
spring 61 runs in tension to continuously urge pawl 5S
in a clockwise direction about portion 39’ (viewing FIG.
3), and thereby biases driving end 59 of the p-awl toward
ratchet wheel 65.
Turning now to an explanation of the operation of
the intermittent drive mechanism 5 of sequence controller
l, it will be seen that when timing motor 3 is energized, it
drives pinion 9. Pinion 9 is in continuous mesh with gear
33 (FIG. 2) and thereby `also drives the `attached gear
35. If it is supposed that motor pinion 9‘ is driving in a
counterclockwise direction of rotation from its position
as shown in FIG. 3, gears 33 and 35 then will be driven
in a clockwise direction of rotation. Gear 35 meshes
with crank gear 37 and thus drives it in a counterclock
wise direction of rotation. As the crank gear 37 is
driven in a counterclockwise direction of rotation, the
nate angularly separated disposition, with the shaft extend
Iing through ‘apertures formed in hub portions 81b and 83b
40 of the respective followers.
IMore particularly, on each
side of the operating unit 6, there is a series of pairs of
axially adjacent .followers 81 and 83 which .are angularly
spaced with «respect to each other. As shown in FIG. 2,
it will be -seen that hub portions 81h and -83b for each
45
pair `of axially adjacent followers 81 and 83 cooperate
via stepped configurations thereof so that each follower
811 is substantially coplanar to lits associated axially ad
jacent fol-lower 83. The relatively thick cam engaging
poi-nt 83a of follower 83 (FIG. 3) engages cylindrical
50 cam track 77 of an associated cam member ‘69‘ `and is
actu-ated thereby, and the relatively thin cam engaging
point 81a «of axially adjacent and angularly spaced fol
lower 81 (FIG. 3) engages an associated cylindrical cam
track 75 ofthe same cam member and is actuated thereby.
55
Followers 81 and `83 are pivotally arranged on each of
the shafts 85 and 86 in essentially the same manner. How
tooth-shaped driving end 59l of pawl 55 successively
ever, axially adjacent cam followers 81 `and 83 on the
enters peripheral notches of ratchet wheel 65 and steps
the ratchet wheel 65 in a clockwise direction (viewing
shaft 85 (FIG. 3) are controlled by the cylindrical cam
tracks 75 «and 77 respectively of one of the cam members
FIG. 3). The tooth-shaped locking end 53 of lever 41 60 69, and another pair of axially adjacent followers v8.1 and
serves a no~back function between driving strokes of pawl
83 ‘which vare diametrically disposed on :shaft 86 at the
55. More particularly, the pawl 55 is driven in a gen
erally sinusoidal fashion to rotate ratchet wheel 65 in a
other side of the cam stack are controlled by the appropri
ate cylindrical cam tracks of the next cam member, etc.
clockwise direction of rotation (viewing FIG. 3), and
This arrangement of the yfollowers enhances the smfallness
locking lever 41 engages peripheral notches of the ratchet 65 lin size of the controller 1 for providing a multiplicity of
wheel to intermittently lock the ratchet wheel 65 in the
controlling functions.
position -to which it has been driven by pawl 55. Pawl
To operate a multiplicity »of electri-c switches in response
55 and locking lever 4i1 thus act upon ratchet wheel 65
to pivotal movements of followers 81 and `S3, as illustrated
to provide intermittent rotation of the ratchet wheel 65
in FIG. 3, `each of the terminal boards 17 and 18 pro
in one particular direction (i.e., clockwise, viewing 70 vides two tiers of :single pole single throw switches 87.
FIG. 3).
Each of these switches 87 is normally closed and includes
For controlling the various devices of our improved
a pair of fixed and movable contacts 89 and ‘91 respec
`sequence controller 1, as shown in FIG. .2, the main
tively, the movable contact 9‘1 being supported by an
rotatable switch operating unit 6 comprises a series of
elongated blade 93. Each of the movable contact blade-s '
cam members 69 stacked coaxially upon and fastened to 75 93 is Idisposed alongside of and next to a switch actuating
3,096,408
point 811.1 or -83c of one of the followers 81 or 83. The
followers 81 and y83 are pivotally arranged upon their
bearing shafts 85 and 86 so that the cam engaging points
81a and 83a may ride upon :cylindrical tracks 75 and 77
of the cam members 69, and switch actuating points .81C '
and 83C are in engagement with associated movable con
tact blades 93 (FIG. 3). It will thus be seen (as shown in
FIGS, 2 and 3) that the controller 1 .includes four groups
of »angularly aligned followers which .are time driven to
control adjacent associated switches.
for receiving the keying projection 97 of the shaft 73. By
means «of cooperation between the keying projection 97
of cam sha-ft 73 .and the keyhole slot 105 of the bushing
99 of ratchet wheel 65, as is well known in the art, the
ratchet wheel 65 .and the cam shaft 73 are locked together
for conjoint rotative movement, while the shaft 73 is free
To bias each of the movable contact blades to its. nor
to reciprocate relative to the ratchet wheel 65.
To manually .actuate a master switch of the controller
1 by axial motion or -reciprocation of cam shaft 73, a
frusto-conioal surface 107 (FIG. 5) is formed near back
end 95 of the shaft 73. Surface 107 has its smallest di
mally closed position, compression springs 94 (FIG. `3)
ameter closest to end 95 of the shaft, and coacts with a
are utilized. The springs 94 run in. compression between
V-shaped curved notch 109 of .an actuating assembly to
wells formed in the terminal boards, .and the blades 93,
cam open the contacts of the master lswitch 87a when the
to bias movable contacts 91 into engagement with their 15 cam shaft is depressed. More particularly, the notch 109
associated ñxed contacts 89. The biasing force provided
is formed within one end of an elongated aperture 1x1-1 of
for each blade 93 is thereby exerted by the blades upon
channel-shaped member 113 (FIGS. 4 and 5). Member
points 81al and `83a` of the followers, to bias the followers
113 has its flat bight section 115 (wherein the aperture 111
radially (about their axes) toward the axis »of the cam.
is formed) rigidly connected to a narrow slot 117 (FIG.
members 69. (See FIG. 3.) When the cam engaging 20 5) of an L-shaped actuator 121.
point of each follower (e.g., point 81a of follower 81 in
The actuator 121, as shown in FIGS. 1, 4, and 5, com
FIG. 3) is :at its radially innermost position with respect
prises an elongated section 119 wherein the aforemen
to its associated cam track, the switch operated by this
tioned slot =117 is formed, a shorter section 12.3 disposed
follower then remains in its normally closed position.
with its longitudinal axis generally parallel to cam shaft
As the associated cam member 69 is thereafter rotated
73 and perpendicular to the axis of section 119, and shoul
intermittently by the previously described drive mecha
der 1215 which extends outwardly from elongated section
nism, when the cam engaging point reaches the radially
119, as an extension thereof (FIGS. 4 and 5). The
outermost position of lits cam track, the follower -is
shorter section 12.3 of the actuator 121 extends inwardly
cammed radially outwardly (relative to cam member 69)
through an enlarged slot 127 (FIG. l) in the back plate
to overcome the biasing force of its .associated movable
15, being in perpendicular disposition thereto. Section
contact blade ‘93 and it opens the associated fsw-itch.
123 engages an associated cam follower 83 to operate
For enhancing the control flexibility for the followers
the main control switch 87a, as shall become apparent
of sequence controller 1, as shown in FIG. 3, an :auxiliary
hereinafter.
cam stack 96 has been utilized. The cam stack 96 includes
The frusto-conical surface 107 of shaft 73 and the
a shaft 96a, auxiliary cam gear 96h fastened to shaft 96a,
channel-shaped member 113 are generally disposed at
and .one or more auxiliary cams 96C suitably fastened to
the rear of controller 1, between back plate 15 and sup
cam gear 96b. Cam gear 96h is in mesh with gear 40
port plate 3l). In viewing FIG. l, it will be noted that
(FIG. 2) and thereby driven through drive mechanism 5.
the longitudinal axis of the actuator assembly (i.e., the
The auxiliary cam 96C is adjacent to and engageable with
axis described by the bight section 115 of member 113
an inwardly extending shoulder 81d or 83d of 'an associ 40 and section 119 of actuator 121) is disposed at approxi
ated cam follower S1 or `83. Thus, gear 40 drives -aux
«iliary cam gear ‘96b to operate ‘a switch 87 adjacent to
an associated cam follower. (See FIG. 3.) More par
mately 45 ° to the longitudinal axis of blade 93 of the
master control switch 87a. Such an arrangement is im
portant in obtaining efficient space utilization in the con
ticularly, when the radially innermost surface of cam
troller 11.
For effectively controlling the movement of
96e is .adjacent shoulder 81d or `83d of the follower `81 or 45 actuator 121 with relation to its associated switch 87a, on
83, it has no yeffect thereupon. However, in response to
shoulder 125 of the actuator, there is formed a curved
time driven rotation of auxiliary cam gear 96h, when the
apex 129 and a flattened side 129a connected thereto.
. radially outermost surface of cam 96h is reached, follower
The flattened side 129e of actuator `1121 rides transversely
81 or 83 is actuated by auxiliary cam '96s, `and the asso
along an adjacent curved surface 131a of a flag-shaped
ciated movable contact .blade ‘93 is cammed to its contacts r tab 131 of the back plate 1'5 (FIG. l) and is skewed there
open position (FIG. 3).
by so that section 123 of the actuator moves in a direction
Turning now t-o an important aspect of the present in
generally perpendicular t0 blade 93. Thus, tab ‘131 ex
vention, as shown in FIGS. 1, 4, and 5, we have provided
tends perpendicularly outwardly from plate 15, on the
an improved means Afor manually controlling la main
left side of slot 127 (viewing FIG. l) and acts upon side
switch of controller 1 and also setting the main cam stack. 55 129a of the actuator 12.1 to redirect the motion of its ac
For an understanding of this arrangement, attention is
tuating section 123 from a 45° relationship with blade 93
first ldi-rected to cam shaft 73j. The shaft 73 is rotatably
to approximately a 90° relationship with blade 93
journalled .at its front end through :a suitable aperture in
(FIG. l).
front plate 13 (not shown). The other or back end 95
For biasing the actuating assembly v113, 121 to its
of shaft 73 is keyed to ratchet wheel 65 for rotation with 60 normal operating position relative to cam shaft 72 (i.e.,
.switch operating unit `6. More particularly, near the back
when shaft 73 is in its “on” or undepressed position), we
end 95 of shaft 73, there is a cylindrical keying projec
have provided a leaf spring 133. (See FIG. 4.) Spring
.tion 97 »which extends radially outwardly from the
133 has one of its ends 134 bent over and suitably fas
periphery of shaft 73, :as shown in FIG. 4. The ratchet
tened to a supporting stud projecting outwardly from
wheel 65 is journalled to back plate 15 by means of an 65 back plate 15. The free end 136 of spring 133 engages
integralcylindrical bushing 99 which is extended through
an aperture 100 in plate 15. In particular, as shown in
a flattened side 135 of the shoulder 125 to bias the ac
tuator assembly 1.13, 121 diagonally and upwardly to
FIGS. 4 and 5, bushing 99 of the ratchet wheel is rotatably
the right along tab 131, viewing FIG. l. As previously
Y .supported in aperture 100 of plate 15 and retained in axial
mentioned, shaft 35 extends outwardly from back plate
y relationship with the aperture V100 by means of a C-shaped 70 15 toward support plate 30. Shaft 85 engages the under
clip 101 which enters an «annular groove yformed in this
side of spring 133 between its ends (FIG. 1) and stresses
bushing 99‘. The rotatable bushing 99 o-f ratchet wheel
the free end 136 of the spring upwardly (FIG. 1) so that
65 has `an aperture i103 (FIG. 5) through which the back
' it imparts a compressive action to flattened side 13.5 of
l end 95 of the camshaft 73 is extended, and a keyhole slot
the actuator assembly 113, 121.
It will thus be seen
Á 105 which extends radially outwardly from aperture 103 75 that spring 133 provides a simpliiied means for continu
aoeaaos
ously urging the actuator assembly 113, 121 to ride in
wardly or away from the spring 133 along tab 131 and
thereby biases this assembly to the position wherein it is
shown in FIG. 4.
-For an explanation of the operation of the master con
trol switch `37a in our improved controller, attention is
now directed to FIGS. 4- and 5. In FIG. 4, shaft ’73 is
illustrated in its outermost or undepressed position (rel
ative to the front of controller 1). The inner corner of
actuator notch 11i@ is then in engagement with the cy
lindrical surface at the extreme end 95 of shaft 73 and
the actuator assembly 113, 121 is biased to this position
8
gularly inwardly and away from body section 143` of the
lever, in the same general direction as connecting por
tion 159, as shown in FIGS. 4 and 5.
The lever 1411 is pivotally mounted upon `shaft 86,
as shown in FIGS. 4 `and 5, by slipping the elongated
aperture 145 of lever 141 around the end ‘86a of shaft `86.
A C-shaped clip l161 is ñtted into an annular groove (not
shown) `formed at the outer end of shaft S6 to retain
body section 1413 of the lever in parallel disposition to
:back plate 15, between plate 15 and support plate 30‘.
(See FIG. 2.) As shown in FIG. f1, a slot 163 is formed
in plate 15 adjacent arm `147 of lever 141, and a slot 165
is formed in plate 15 adjacent the biasing arm 155 of
the lever 141. The connecting portion 159 near arrn 147
ing surface 123e of the shorter section 123 of actuator
extends inwardly through the slot i163, and biasing arm
121 has no eifect upon the follower 33 which controls
155 extends inwardly through the slot 165. (See also
master switch 87a, and this switch 37a is in its normally
FIG. 2.)
closed position. ‘When cam shaft 73 is pushed down
To enable lever 1451 to act upon the rotatable switch
wardly and diagonally to the right from where it is shown
operating unit 6 and precisely locate the beginning of a
in FIG. 4 (i.e., when bottom end 95 moves away from
back plate 15), the V-shaped notch 169 of actuator chan 20 program or part thereof for controller ‘1, outermost face
164 of ratchet wheel 65 has an annular recess 1166 with
nel member 113 is engaged by frustoconical cam surface
a stop notch 169 «formed therein. More specifically,
1117 of shaft 73 and actuator assembly 113», 1211 is thereby
recess `166 is formed in wheel 65 between a generally
moved diagonally toward the curved bottom 131a of
by spring 133. With the shaft 73 in this position, actuat
flag-shaped tab 131 (FIG. 1). ‘Flattened surface 12911
cylindrical inwardly facing rim 167, and `a hub portion
motor 3 so that when shaft 73 is depressed, this motor
in this manner, it has been found unnecessary to use
of the actuator rides along tab 131 against the force of 25 (not shown) behind bushing 99 (FIG. 4). Stop notch
169 is formed as an interruption of rim 167, and is sufli
spring 133 in a generally perpendicular direction, or down
ciently wide to allow tooth 149 of rlever 1411 to enter it.
ward toward side 139 (viewing FÍG. 1) of back plate 15.
(See FIG. 5.) Upon depression and rotation of cam
As the actuator assembly 113, 121 moves transversely
shaft 731, the lever 141 is spring biased radially outwardly
in response to the eamming effect thereupon of shaft 73,
the assembly is guided for transverse movement between 30 against rim 167 of ratchet Wheel 65 so that when the
tooth i149 enters notch 169, it engages the notch and the
plates 15 and 31B.
switch operating unit »6 is retained in a predetermined
When shaft 73 reaches its depressed position (which is
starting position.
represented in FIG. 5), the surface 123a (FIG. 4) of the
For continually biasing stop tooth '149 of lever i141 into
actuator assembly 113, 121 has been skewed by tab 131
engagement with notch 169', the .previously mentioned
into a generally perpendicular direction toward blade 93
coil spring 61 (FIGS. 4 and 5) runs in tension between
of the switch and this surface has acted upon follower
motch 157 of the biasing arm `155 of lever 1141, and
83 to open the master switch 87a. It will be understood
notched arm k57 of `driving pawl 55. By using spring 61
that master switch 67a is electrically connected to timing
is thereby deenergized. ‘It will be further understood that 40 separate springs for biasing the lever 141 and pawl 55 in
accordance with their respective functions. A resultant
when shaft 73 is pulled outwardly from its depressed
cost reduction is thereby‘achieved by the use of the spring
position, a reverse operation of actuator assembly 113,
61.
121 ensues, and spring 133 takes over to close the master
For a detailed explanation of the operation of lever
switch 87a.
When viewing FIGS. 4 and 5, it will be noted that 45 141, attention is now ydirected to FIG. 4. When cam
shaft 73 is in its outermost or undepressed position
master switch 87a of controller 1 is operable by the fol
(FIG. 4), end I171 of the channel-shaped member 1‘13
lower S3. This particular follower 63 is the same type
engages side 153e of lever shoulder î15?». The force of
of follower as the other followers 83 (FIG. 3) and, as
leaf spring "133 thus holds «end `171 of actuator assembly
shown in FIG. 5, it is likewise also operable by one of
»1113, ‘121 against shoulder 153 of lever `141 tin opposition
the cam members 69.
to the biasing yforce imparted to lever l1411 by spring 61.
It will now therefore be seen that by means of the
The result of this condition is that stop tooth i149 of the
frusto-conical cam surface 107 formed upon shaft 73
lever -1‘41 is held radially inwardly (toward the axis of
and the structure and mode of operation of actuator as
wheel `65) and away from the inner rim 167 of the ratchet
sembly 1113, 121, the mai-n controlling switch 87a of our
wheel 65. IIn other Words, the action of actuator assembly
sequence controller 1 may be readily operated manually
113, 121 upon operating arm i151 of lever 141 partially
to control a driving means for the controller, such as tim
overcomes the biasing force imparted to arm 155 of lever
ing motor 3. With this arrangement, motor 3 may be
141 by spring 61, to hold lever 141 in the position where
simply and efliciently turned “off” before advancing the
it is shown in FIG. 4, with stop tooth 1149’ out of en
cam stack to its desired starting position.
Turning now to another and very important aspect of 60 gagement with rim 167. With lever ‘141 in this position,
shaft 86 is on the left side of elongated slot 1415 (view~
our invention, attention is further directed to FIGS. 1, 4,
and 5.
On the shaft 86 near to side 140 (FIG. l) of back
ing FIG. 4).
However, when the cam shaft 73 is depressed or moved
plate 1‘5 and between the back plate 15 and support plate
to its innermost position for opening the line switch
3i) (FIG. 2), there is pivotally mounted a spring biased
lever 141. The lever 141 essentially comprises a flat 65 87a, the frusto-conical surface 107 of shaft 73` acts
upon notch 1019 of the member 113 to force the end 171
body section 143 with an elongated aperture 145 formed
of the actuator assembly away from shoulder 153- of the
therein, latching arm 147 with a stop tooth 149 formed
lever i141. As end ‘i171 of the actuator lassembly moves
thereon, operating arm 151 with a shoulder i153 formed
away from shoulder 153 of lever 141 (toward the posi
thereon, and biasing arm 155 with a notch 1‘57 formed
therein. The arm 147 is parallel to the flat body section 70 tion where it is shown in FIG. 5), the spring I61 takes
over and forces tooth 149 to pivot into engagement with
143 and spaced slightly inwardly therefrom toward ratchet
rim Ii167. With the cam shaft 73 depressed, as the main
wheel '65 by connecting portion 'i159 (FIGS. 4 and 5).
switch operating unit 6 is then rotated in a counterclocká
Shoulder 153 is directed perpendicularly outwardly from
wise ‘direction (viewing FIG. 5), the ystop tooth 149 of
the plane of body section 143 of the lever toward sup
port plate 311 (FIG. V2). Biasing arm 155 is directed an 75 lever 141 rides upon rim 167 until it reaches the positive
3,096,408
10
stop notch y169. `Once tooth 149 of lever 141 has entered
2. In a timing mechanism including a plurality of
notch '169, further rotation of the switch operating unit
sequentially operable control devices, a rotatable operating
unit for actuating said devices, a shaft coaxially arranged
within said unit for setting said unit, said shaft being
disposed for reciprooable movement relative to said unit,
6 in the same `direction causes shoulder l149a of the
tooth 149 to reach side shoulder 16911 (FIG. 4) of the
notch v169 and -also pulls lever 141 against the force of
spring 61 until the right side of elongated slot 145 en
gages shaft 86 (as shown in FIG. 5). When this action
has occurred, the operating unit 6 is stopped at a `desired
predetermined starting position for the sequence con
a camming surface on said shaft, an actuator having a
follower surface thereon, a control element arranged for
operation by said actuator, said camming surface of said
shaft being disposed for coaction with said follower sur
troller 1.
10 face of -said actuator to move said actuator transversely
When the cam sha-ft 73 has been depressed to open the
relative to the axis of said shaft in response to reciproca
line switch 87a and the switch operating -unit 6 has been
tion of said shaft for operating said control element, and a
thereafter rotated until the unit 6 has reached its pre
positive stop means arranged for activation by said actua
determined starting position (FIG. 5), pulling shaft 73
tor in response to reciproeation of said shaft to coact with
outwardly (to turn on the controller 1) causes lever 1-41 15 said rotatable unit for positioning said unit at a predeter
mined starting position.
to pivot on shaft 86 so that stop tooth 149 moves out
of notch 169. More particularly, actuator assembly 1‘13,
3. Control mechanism comprising -a plurality of
l121 return to its position shown in FIG. 4, where it en
switches, a rotatable operating unit for actuating said
gages shoulder '153 of lever 141. The force of spring
switches, means for driving said unit through -a timed
611 is thus partially overcome to pivot tooth 149 of lever 20 cycle of operation, =a manually operable switch, `a shaft
141 out of engagement with notch 169. As the tooth
extending coaxially through said unit and linked thereto
149 clears the stop notch »169, spring 61 pulls the elon
for setting said unit by rotation of said shaft, said shaft
gated aperture 145 of lever 141 from the position Where
being reciprocably movable between ñrst and second posi
it is shown in FIG. 5 to a position similar to that shown
tions relative to said unit, a camming surface formed on
in FIG. 4. Shaft 86 is then again on the left side orf 25 said shaft, an actuator with a follower surface formed
elongated aperture 145 (as shown in FIG. 4) and tooth
'149 of lever 141 is pulled laterally away from notch 169
thereon, said camming surface of said shaft being dis
posed for coaction with said follower surface of said
so that it now abuts rim 167 at a point represented by
actuator to move said actuator transversely relative to the
dotted lines in FIG. 5. With such an arrangement, tooth
Iaxis of said shaft in response to axial movement of said
149 cannot re-enter notch 169 after shaft 73 is pulled 30 shaft from said first to said second position thereby to
out and then immediately depressed. Under such con
open said manually operable switch, a positive indexing
dition, due to the arrangement of the elongated aperture
means formed in said rotatable operating unit, and a
145 of lever `141 on shaft 86, the unit >6 must be rotated
pivoted latching lever arranged for lactivation by said
another revolution before the unit 6 may again be posi
actuator when said shaft is in said second position, said
tively stopped in the starting position.
35
latching lever being engageable with said positive index
lt will thus be seen that by means of spring biased
ing means upon rotation of said shaft in the second posi
lever 141 and the -cooperation between tooth 149 thereof
and the stopping notch 169, a simpliñed and precise
tion for positively positioning said unit at a predetermined
starting position for the commencement of a program
4. The control mechanism of claim 3 wherein the latch
starting position.
(or part thereof) by the sequence controller 1 is thereby 40 ing lever has an elongated aperture formed therein, a
achieved.
pin extended through said aperture for pivotally support
From the foregoing, it will now be understood that
ing said latching lever, said lever being in slidably cooper
there is provided an improved sequence controller with a
ating »disposition with said pin and arranged thereupon so
novel and ellicient actuating means for -manually operat
that when said lever is in engagement with said positive
ing one of the electric switches. It will further be seen 45 indexing means and said shaft is moved from said second
that the improved sequence controller 1 includes an
vto said first position the lever slides on said pin to prevent
effective positive positioning means which is controllable
re-engagement of said lever with said indexing means
by the manually operatble -actuating means for assuring
until Said unit is substantially rotated relative to said
lever.
location.
5. Control mechanism comprising a plurality of switch
50
While in accordance with the patent statutes, we have
es, a `rotatable operating unit for actuating said switches,
described what at present is considered to be the pre
one of said switches including an elongated movable con
ferred embodiment of the present invention, it will be
tact blade, `a shaft extending coaxially through said unit
obvious to those skilled in the art that various changes
and linked thereto for setting said unit by rotation of
and modifications may be made therein without depart
said shaft, said shaft being reciprocably movable between
ing lfrom the invention, and we, therefore, aim in the
first and second positions relative to said unit, :a camming
Afollowing claims to cover all such equivalent variations
surface on said shaft, an actuator located near one end of
that fall within the true spirit and scope of this invention.
said shaft, said actuator having an elongated section dis
that the sequence controller will start in a predetermined
What we claim as new and desire to secure by Letters
posed transversely to the axis of said shaft and at an acute
Patent of the United States is:
60 angle relative to the longitudinal axis of the movable blade
1. In a timing mechanism including a plurality of se
of said one switch, -a follower surface on `said elongated
quentially operable control devices, a rotatable operating
section, said camming surface of Isaid shaft being disposed
unit for actuating said devices, a shaft coaxially arranged
for coaction with said follower surface of said actuator
within said unit for setting said unit, said shaft being dis
to move said actuator transversely relative to the axis of
posed for reciprocable movement relative to said unit, a 65 said shaft in response to axial movement of said shaft
from said first to said second position thereby to open
camming surface on said shaft, an actuator having a fol
lower surface thereon, a control element arranged for
said one switch, skewing means for controlling the trans
operation by said actuator, said camming surface on said
verse movement of said actuator so that said actuator
shaft being disposed for coaction with said follower lsur
directs an actuating force in perpendicular disposition to
face on said actuator to move said actuator transversely 70 the axis of said movable blade, a positive indexing means
relative to the axis of said shaft in response to reciproca
formed in said rotatable operating unit, and «a pivoted
tion of said shaft for operating said control element, `and
latching lever arranged for activation by said actuator
a positive stop means including said actuator arranged to
when said shaft is in said second position, said latching
coact with said rotatable unit for positioning said unit at
lever being engageable with said positive indexing means
a predetermined programming position.
75 upon rotation of said shaft in the second position for posi
accesos
l1
12
tively positioning said unit at a predetermined starting
position.
actuator when said shaft is in said first position and ar
ranged for lactivation by said actuator when said shaft is
6. `Control mechanism comprising Ia plurality of
switches, a rotatable operating unit for actuating said
in said second position, spring biasing means for normally
urging sa-id latching lever into engagement with said in
dexing notch, said lever being moved by said biasing
switches, one of said switches including an elongated mov
able contact blade, a shaft extending coaxially through
lsaid unit and linked thereto for setting said unit by rota
tion of said shaft, said shaft being reciprocably movable
means into engagement with said notch upon rotation
to the axis of said shaft in response to »axial movement of
between first and second positions relative to said unit, a
of .said shaft in the second position for positively posi
tioning said unit at a predetermined starting position.
9. Control mechanism comprising a plurality of
between first and second positions relative to said unit, a
camming surface on said shaft, an ‘actuator located near 10 switches, a rotatable operating unit for actuating said
switches, means for driving said unit through »a timed
one end ofsaid shaft, said actuator having an elongated
cycle of operation, said means including a ratchet wheel
section disposed transversely to the axis of said shaft «and
associated with said unit `and a driving pawl intermittently
at an iacute angle relative to the longitudinal axis of the
engageable with said wheel for driving said unit, a manual
movable blade of said one switch, a follower surface on
ly operable switch, -a shaft extending coaxially through
said elongated section, said camming surface of said shaft
said unit and linked thereto for setting said unit by rota
being disposed for coaction with said follower surface of
tion of said shaft, said shaft being reciprocably movable
said actuator to move said actuator transversely relative
said shaft from said first to said second position thereby
camming surface formed on said shaft, Ian actuator with a
to open said one switch, and skewing means for control 20 follower surface formed t-hereon, said camming surface
of said shaft being disposed for coaction with said follow
ling the transverse movement of said actuator so that said
actuator directs an actuating force in generally perpendic
ular disposition to the axis of said movable blade.
7. Control mechanism comprising a plurality of
switches, a rotatable operating unit for actuating said
switches, means operable by one of said switches for
driving said unit through a timed cycle of oper-ation, a
shaft extending coaxially through said unit and linked
thereto for setting said unit by rotation of said shaft, said
shaft being reciprocably movable between first and second
positions relative to said unit, a camming surface formed
on said shaft, said camming surface having a frusto-coni
er surface of said actuator to move said `actuator trans
versely relative to the axis of said shaft in response to
'axial movement of said shaft from said first to said sec
ond position thereby to open said lm'anually operable
switch, a positive indexing means formed in said rotatable
operating unit, a pivoted latching lever `arranged for ac
tivation by .said actuator when said shaft is in said second
position, a biasing spring arranged in tension between said
driving pawl and said latching lever to urge said pawl into
engagement with said ratchet wheel and to concurrently
urge said lever into engagement with said indexing means,
cal configuration, an `actuator with la follower ‘surface
said latching lever 'being engageable with said positive
formed thereon, said follower surf-ace having a generally
indexing means upon rotation of said shaft in the second
V-shaped configuration, said camming surface of said 35 position for positively positioning said unit at a prede
termined starting position.
shaft being disposed for coaction with said follower sur
face of said actuator to move said actuator transversely
l0. The control mechanism of claim 9 wherein the
relative to the `axis of said shaft in response to `axial m‘ove
ment of said shaft from said first to said second position
thereby to open ysaid one switch ‘and deenergize the driving
means for said unit, a positive indexing means formed in
actuator is L-shaped- in configuration, said actuator com
prising an elongated section with an ,aperture formed
therein between first and second ends` of said section, said
aperture having a follower surface of V-shapcd configura
said rotatable operating unit, and a pivoted latching lever
tion formed thereon, said shaft extending through said
arranged for activation by said actuator when said shaft
aperture `and having a frusto-conical camming surface
is in said second position, said latching lever `being en
formed thereon, said frusto-conìcal surface coasting with
gageable with -said positive indexing means upon rotation 45 the follower 4surface of the actuator to move said actuator
of said shaft in the second position for positively position
transversely tothe axis of the shaft between first and
ing said unit at a preedtermined starting position.
second positions in response to reciprocation of said shaft,
8. Control mechanism comprising a plurality of
said first end of said actuator section having a control
switches, a rotatable operating unit for actuating said
surface thereon for deflecting the transverse movement
switches, means operable by one of said switches for driv 50 of said actuator from one direction to another direction
ing said un-it through a timed cycle of operation, `a shaft`
for controlling said manually operable switch, said sec
extending coaxially through said unit and linked thereto
ond end of said actuator section being engaged with said
for setting said unit by rotation of said shaft, said shaft
lever to preclude engagement of said latching lever with
Ibeing reciprocably movable -between first `and second posi
said indexing means when said `shaft is in said first posi
tions relative to said unit, a camming surface formed on 55 tion.
said shaft, an actuator with a follower surface formed
thereon, said camming surface of said shaft being disposed
for coaction with said follower surface of said actuator to
move said actuator transversely relative to the axis of said
shaft in response to axial movement of said shaft from 60
said first to said second position thereby to open said one
switch and deenergize the driving means of said unit, an
indexing notch formed in Ásaid rotatable operating unit at
one end thereof, a pivoted latching lever engaging said
References Cited in the file of this patent
UNITED STATES PATENTS
2,066,246
2,297,694
2,300,020
Bolton ______________ __ Dec. 29, 1936
Dunham ______________ .__ Oct. 6, 1942
Smith _______________ _.. Oct. 27, 1942
2,311,545
2,585,018
Hurley et al. _________ „_ Feb. 16, 1943
Kreitchman et al _______ __ Feb. l2, 1952
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