US3246090A - Stepping timer with normal and rapid advance speed control - Google Patents

Stepping timer with normal and rapid advance speed control Download PDF

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Publication number
US3246090A
US3246090A US256608A US25660863A US3246090A US 3246090 A US3246090 A US 3246090A US 256608 A US256608 A US 256608A US 25660863 A US25660863 A US 25660863A US 3246090 A US3246090 A US 3246090A
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Prior art keywords
timer
motor
switch
wiper
normal
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Expired - Lifetime
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US256608A
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English (en)
Inventor
Frederick R Beck
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Controls Company of America
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Controls Company of America
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Publication date
Priority to GB1054413D priority Critical patent/GB1054413A/en
Priority to GB1054414D priority patent/GB1054414A/en
Application filed by Controls Company of America filed Critical Controls Company of America
Priority to US256608A priority patent/US3246090A/en
Priority to DE19641463010 priority patent/DE1463010A1/de
Application granted granted Critical
Publication of US3246090A publication Critical patent/US3246090A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/10—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed
    • H01H43/12—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed stopping automatically after a single cycle of operation
    • H01H43/125—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed stopping automatically after a single cycle of operation using a cam

Definitions

  • This invention relates to timers of the type having provision for a normal timing speed and a rapid advance speed which is used for initially positioning the timer to the desired starting point or may be used to skip a portion of a program.
  • the present invention is particularly related to the provision of a switching arrangement for de-energizing the circuits controlled by the timer during the time the rapid advance mechanism is operative.
  • Timers of this general class are referred to as power timers (since the timer is power driven to the desired starting point or to skip a portion of a program) and the initial design of this type employed two motors, one for driving the timer at a normal timing speed and a second motor which was employed for the rapid advance.
  • the motor in this design is fully energized only when the rapid advance mechanism is operative and at other times a voltage dropping resistor is put into series with the motor coil to reduce the flux density of the motor to a point where the biasing spring can move the rotor out of the frame. Under the latter condition the rotational speed of the motor is substantially the same as its speed when fully energized. Partial energization is used to drive what might be termed a timer timing arrangement which determines when the motor is to be fully energized to advance the timer to the next interval.
  • the full energization of the motor is employer for the advancing motion to index the main timer one step and is also used when rapid advancing the timer to a desired starting point or when rapid advancing the timer to omit a portion of the available program. While the motor armature moves axially when fully energized it will be appreciated that this axial motion cannot be used to actuate a line switch as in the earlier power timer design since this would result in the line switch being actuated even when the timer was only to take on step. This would result in dropping out the machine circuits on each step. Since the initial action of the motor during rapid advance cannot be used to actuate a line switch the provision of a line switch for such a timer is a more complicated problem and it is to this problem that the present invention is addressed.
  • the principal object of this invention is to provide a line switch arrangement for power timers of the type having but one motor.
  • the single motor power timers heretofore proposed have all employed an axially shiftable armature in the motor for clutching in and out the stepping or (rapid) advance mechanism.
  • the resultant necessity for bearings 3,246,090 Patented Apr. 12, 1966 capable of withstanding rotational and axial motion leads to undesirable considerations regarding motor life and performance and this invention is also directed to the provision of an improved design eliminating the need for axial movement of the rotor to thereby make possible a superior motor performance.
  • the improved motor design results in better magnetic coupling to the armature which, in turn, gives better torque characteristics and insures better performance of the timer interval timing arrangement.
  • Still another object of this invention is to provide in conjunction with either the axially movable rotor arrangement or with the motor having the rotor fixed against axial movement a line switch controlling mechanism which is operative to actuate the line switch only in the event the mechanism calls for two steps (or more) in rapid sequence.
  • A. further object is to provide a line switch arrangement for single motor power timers, which switch will not be actuated on the initiated energization (or on the first step) of the motor and which will be returned to its normal position at the conclusion of the rapid advance.
  • a still further object is to provide a single motor power timer in which provision is made for positively returning the timer timing arrangement to an initial position from which it will start upon resumption of the normal timing operation of the timer.
  • FIG. I is a simplified showing of a timer embodying a movable rotor in the motor and provided with a line switch; 7
  • FIG. 2 is a fragmentary sectional view taken to illustrate the manner in which the cam arrangement prevents actuation of the line switch on the first step while pro viding for actuation of this switch on the second and subsequent steps in rapid sequence;
  • FIG. 3 is similar to FIG. 2 but shows a subsequent step in operation
  • FIGS. 2A and 3A are perspective views corresponding to FIGS. 2 and 3;
  • FIG. 4 shows the switch operating mechanism in the position occupied when the switch has been actuated during rapid advance
  • FIG. 5 is a view taken as indicated by meandering line 55 on FIG. 1 to show the mechanism provided for driving the line switch back to its normal position .upon resumption of interval timing;
  • FIG. 6 is a view from the left of the face splines provided for the clutching arrangement between the timing hub and the time base wiper carrier;
  • FIG. 7 is a view showing the three teeth on the face of the time base wiper carrier for engagement with the face splines and in which the teeth are unequally spaced to result in a minimal angular travel between the parts before picking up the drive;
  • FIG. 8 is a schematic wiring diagram of the pertinent parts of the timer
  • FIG. 9 is a fragmentary view comparable to FIG. 1 but showing a modified arrangement in which the motor armature is not axially movable;
  • FIG. 10 is a fragmentary view showing the initial position of the parts of FIG. 9 prior to actuation of of the line switch.
  • FIG. 11 is a view comparable to FIG. 10 but showing the parts in the position they occupy when the switch has been actuated.
  • the program timer includes a ca m drum having a plurality of disc cams 12, each of which is adapted to operate one or more switches engaging the periphery of the individual disc.
  • This drum is adapted to be moved in steps and for ease of control this is usually taken to be about six degree steps.
  • the timing can, however, be effected from a face cam or the like without departing from the scope of the present invention.
  • the cam arbor is provided with a drive gear 14 which is engaged by pinion 16.
  • Pinion 16 is carried on shaft 18 which carries gear 24 which is the end of a stepping gear train including gears 21, 22, 23, 24, 25, 26, and 27.
  • Gear 27 has a clutch half 28 fixed thereto while the other clutch half 30 is fixed on rotor shaft 32.
  • the rotor 34 of the shaded pole motor 35 is normally biased to the right (as illustrated) so that it is only partly in the motor frame 36.
  • the rotor is biased by spring 38 which is compressed between member 40 and counterweight 42 which bears on rocker 14 pivoted at 46 with the other end of the rocker bearing against the end of rotor shaft 32.
  • Rotation of the shaded pole motor armature 34 in the position shown in FIG. 1 will serve to rotate shaft 32 in its bearing 48 and turn pinion 50 to drive a timing gear train 52 which includes gears 53, 54, 55, 56, 57, 58, 59, 6t 61, 62, and 63.
  • This gear train is driven whenever the shaded pole motor is energized, whether the motor is only partly energized or is fully energized.
  • the counterweight 42 acting on the rocker 44 serves to counterbalance the weight of rotor 34 to prevent axial motion of the rotor by reason of vibration of the machine in which the timer is mounted.
  • Gear 63 is rotatably retained on the fixed stub 64 by the vD-ring 66 and carries an annular member 6 8 provided with face splines (FIG. 6) which are adapted to be engaged by one of the three spaced teeth 70 carried on the cylindrical portion 72 of the time base wiper carrier assembly 74.
  • the three teeth are not equally spaced so that a minimal angular displacement between the parts 68 and 72 will be required to engage one of the teeth with a face spline. The reason for this will be pointed out more fully hereinafter.
  • the cylindrical portion 72 is a part of the wiper carrier 74 having the central hub 76 rotatably and slidably mounted on the sleeve bearing 78 projecting from stub 64.
  • the left end of the sleeve bearing 78 carries a D- ring 80 against which spring 82 seats to bias the carrier 74 to the right as viewed in 'FIG. 1 and this, in turn, urges the teeth 70 on portion 72 into engagement with the face splines on ring 68 so while the timing gear train 52 is running it will normally drive from gear 63 into ring 68 and turn carrier 74.
  • the carrier 74 has a hub 84 on which the ring portion 86 of wiper 88 is slidably mounted.
  • the wiper includes radial arms and wipers 90, 90 which project axially into contact with a printed circuit on the face 92 of insulated circuit board 94.
  • Spring 96 acts to urge the wiper assembly into contact with the printed circuit. It will be appreciated that if the carrier 74 is moved to the left the spring 96 will yield so as to not damage wipers 90, 90.
  • the wipers are driven by the channel-like projections 93 and 111i) projecting fro-m carrier 74. It will be noted the channellike member 100 is somewhat longer than 98 so that it may engage the zero position stop member 162 as illustrated in FIG. 1.
  • the clock spring 164 which 4- has one end fixed to stub 64 and the other end faxed to cylinder 72, is wound up in a direction tending to drive the carrier assembly back to stop 102. If the carrier assembly is moved to the left to disengage the clutch comprised of ring 68 and teeth the clock spring will drive the carrier assembly back to its zero position. This action is employed whenever the rapid advance is operative so that the wipers 90, will always start from a zero position.
  • the timing wipers are used to bridge printed circuit elements at preselectable intervals starting from the zero position to determine when the rapid advance or stepping gear train will become effective. Additional details of this timing function will be described hereinafter with respect to the circuit diagram.
  • the pin 106 can be moved to the left to release the carrier assembly 74 for return to its zero position under the drive of the clock spring 104.
  • a drop portion of face earn 168 will be reached allowing pin 106 to return to the right and permit re-engagement of the wiper carrier assembly 74 with the timing gear train.
  • FIG. 8 shows this printed circuit along with the printed circuit contacted by the main timing cam wipers 114 which in FIG. 1 number four while in FIG. 8 they are shown as three wipers 114a, b, and c.
  • the shaded pole motor 35 is across the lines L1 and L2 by a circuit going from L-1 through the shaded pole motor into contact strip 116 and from contact strip 116 through a printed lead 118 which in the interval (as distinct from rapid advance or stepping) is connected to the dropping resistor 129, to printed circuit track 122 and from there through line switch No. 2 which connects to lead 124 which goes through the main timer bank to come back through lead 126, through the N0. 1, line switch to line L-Z.
  • the dropping resistor is in series with the shaded pole motor and the wiper assembly 90, 90 is at the zero point at the right-hand end of the circuit strip 122.
  • the wipers 90 move to the left (actually in a circular path) along the strip to Contact first the various spray contacts 123, which can be employed to give a spray rinse, but the important consideration is that these wipers will also bridge contacts 130, 132 and 134 and, depending upon the printed circuit arrangement bridged by the main wiper assembly 114, one of these will be electrically hot so that when the wiper assembly 96 bridges between strip 122 and pad 13%, 132 or 134, the dropping resistor 120 will be shunted and full line voltage will be applied to the shaded pole motor to permit the motor to pull in the rotor and drive the stepping gear train.
  • the pads 13%, 132 and 134 correspond respectively to intervals of two, four and six minutes so that in any given position of the timer there is available, by the arrangement of the printed circuit, a possible interval of two minutes, four minutes or six minutes and this greatly enhances the versatility of this type of timer.
  • the two minute pad 130 is connected to the main printed circuit pattern 136 while the four minute pad is connected to the pattern 138.
  • the patterns 136 and 138 will be energized whenever the main wiper assembly 114 bridges between 116 and either 136 or 138.
  • the main wiper assembly in effect, moves from top to bottom (on this pattern in FIG. 8) and the particular pad contacted by the wiper assembly 114 can be visualized by imagining a straight line across the various patterns.
  • the hot strip 116 on the main printed circuit is also connected to a strip 140 which is adapted to be contacted by the stepping wiper assembly 112.
  • the stepping wiper assembly normally will occupy a position at the right of strip 140 resulting in .an impossibility of completing a circuit bridging from 140 through the wiper 112 to the strip 142.
  • the stepping drive becomes operative and starts driving the main cam 10 it will also start driving the stepping wiper 112 which results in the wiper bridging strips 140 and 142 to establish a holding circuit shunting resistance 120 until the stepping wiper gets back to its initial position in which it cannot bridge these two strips.
  • the present printed circuit arrangement incorporates a power drive arrangement for seeking out a desired starting point upon actuation of any of the push button switches A, B, C, D, E, F, G, or H which are of the latching variety, that is, if one of these buttons is depressed it will release the previously depressed button for return to its normal position.
  • the momentary switch 144 is actuated whenever any of these buttons is depressed.
  • T he switch labeled ABO means all buttons out and if all buttons somehow are in the released position then there will be an open switch ABC to prevent the continuous seeking by the shaded pole motor.
  • the circuit arrangement here is such that the seeking system will seek an open circuit and, of course, if all buttons are out and the ABO switch is open then the seeking circuit will find pad 146 on the printed circuit arrangement.
  • each of the push buttons is connected to one or more small circuit pads arranged at various positions along the path of the pattern 148 for contact by wiper 1140. In each position of the wiper assembly 114 the wiper 1140 will contact either pattern 148 or one of the small pads corresponding to one of the push buttons.
  • FIGS. 1 through 4 illustrate the manner in which the line switch is operated in this embodiment.
  • the two line switches are stacked and mounted as illustrated and are provided with a common actuating pad 156 which is adapted to be actuated by lever 158 mounted on bracket 160 for pivotal and rocking motion, that is, it can both pivot and rock sideways.
  • the lower end of this lever in the normal timing position rides on the cylindrical hub portion 162 of the gear assembiy 23, 24.
  • the lower end of the lever 158 is biased to the right by its spring 164 but is restrained from moving to the right by the arm 166 projecting behind or to the right of the lever in FIG. 1.
  • This arm 166 is carried by lever 163 pivoted at 171) and having its left-hand end riding on the periphery of carrier 74.
  • the periphery of carrier 74 is notched, as illustrated in FIG. 5, so that in the zero position of the time base wiper assembly the end of lever 168 can fall into the notch 172 to allow the spring 164 to rock lever 158 counterclockwise if the lever is free so to do.
  • FIG. 3 illustrates the position of lever 158 when it has fallen onto shelf 174 prior to being actuated by the rising surface 17%. From this description it will be apparent that the line switch actuating lever 158 cannot actuate the switches until the stepping gear train is into the second step.
  • this arrangement has an advantage in several respects. It will be recalled that in the first embodiment it was necessary to use the time base wiper carrier to drive the line switches back to their normal positions whereas this embodiment will return immediately upon the shaded pole motor being operated at reduced voltage. This present embodiment also has an advantage in that it avoids axial motion of the rotor which results in far superior bearing performance and motor design. Now, referring to these figures in detail, it will be noted that here the shaded pole motor 2% has the rotor 292 mounted slightly out of the frame 294- so as to permit the movable clutch assembly 206 to pull in close to the frame when the frame is fully magnetized by operation of the motor at full line voltage.
  • this assembly the magnetic field set up by full energization of the motor is used not to pull the rotor but to pull the clutch assembly 206.
  • This clutch assembly is merely slidable on the motor shaft 2% and is provided with spaced collars 213 between which the forked ends of lever 212 project to pick up the motion so that as the clutch 2% moves to the right when the motor is fully energized the lever 212 will rock about its pivot 214 and move the assembly from the full line position in FIG. 9 to the dotted line position in FIG. 9.
  • the pivot 214 is carried by a bracket assembly 216 which also carries a biasing spring 218 which serves to bias the lever and also clutch 206 to a position in which the clutch is disengaged.
  • the assembly also carries another spring 220 which is relatively weak and serves only to cause the switch actuating arm and follower 222 to tend to follow the motion of lever 212. It is important to remember that spring 218 is stronger than spring 220 so that its influence controls operation of the clutch.
  • the switch actuating arm and follower 222 is normally in the timing position (in the position shown in full lines) and in this position it is riding on the small cylindrical diameter 224 of the stepping gear train gear hub carrying gears 23, 2 as in the first embodiment. When the motor is fully energized the clutch 206 pulls to the right and tends to throw arm 222 to the left. However, before the lever can move down to the flat face 226 the gear hub must make a rotation pulling the face 228 out from under the arm 222.
  • the surface 223 underlies the arm and prevents pulling the arm to the left in FIG. 9.
  • the surface 226 generally underlies the arm the arm can now move under influence of the light spring 229 against the surface 226 where the cam configuration 230 will act to cam the arm (FIG. 10) to the left to actuate the snap line switch 232.
  • the influence of the light spring 221) will now pull the arm 222 further to the right to ride on the large diameter portion 234 of the hub assembly.
  • the stronger spring 218 will disengage the clutch 2196 and at the same time will throw lever 222 back to its normal solid line position in FIG.
  • a timer comprising, a programming device adapted to be advanced in a step-by-step manner to control circuits determining a sequence of operations, an interval timer for timing the period of time between step advances of the device, a motor driving the interval timer, stepping drive means including a clutch connecting the motor to the program device, means operated by the drive means returning the interval timer to a starting position each time the interval timer advances a step, switch means, means operated by the drive means and actuating the switch means only after the drive means has been continuously operated by the motor to drive the program device more than one step.
  • a timer including a motor, a switch actuating program device to be actuated by the motor in finite steps, drive means connecting the motor to the program device, a switch, means operatively associated with the drive means for actuating the switch and including means pre venting actuation of the switch until the drive means has operated continuously to drive the program device in excess of one step.
  • a timer comprising, a program device including switches controlling circuits in a program sequence and adapted for step-by-step advance over a prescribed path in finite increments either in rapid sequence to skip some of the program or with an interval of time between steps, drive means connected to the program device, an interval timer regulating operation of the program device drive means and serving to determine the duration of the interval between steps of the program device, means connected to the program device drive means and determining when the drive means should advance the program device in rapid sequence, a rapid advance switch operable to de-energize at least some of the circuits controlled by switches of the program device, means controlled by the drive means and operating the rapid advance switch and including means controlled by the drive means and to delay rapid advance switch operation during the first step of any advance, and means operated by the internal timer and restoring the operation of the interval timer whereby the operating means cannot operate the rapid advance switch except after at least one step of any ad- Vance.
  • a timer according to claim 3 including means phasing operation of the interval timer with the program device so the interval timer is positioned to start timing an interval upon conclusion of any advance of the program device.
  • a timer comprising, a program device including circuit control means and adapted for step-by-step advancement in finite increments either in rapid sequence or at timed intervals, drive means driving the program device, switch means operative to de-energize the circuit control means, actuating means operating the switch means, first cam means operable with the drive means to actuate the actuating means, means holding the actuating means from the cam means and responsive to operation of the drive means to release the actuating means, second cam means preventing the actuating means from following the first cam means until the drive means has continuously driven the program device more than one step.
  • a timer according to claim 6 including means operative upon completion of operation of the drive means to restore the switch means to its normal inoperative position.
  • a timer according to claim 6 in which the first and second cam means are carried on a common rotating part of the program device drive means with the first cam means moving the actuating means radially and the second cam means controlling axial movement of the actuating means towards the first cam means.
  • a timer comprising, program device adapted for step-by-step advance over a prescribed path in finite increments, an electric motor having a fixed stator and an axially fixed rotor, means connected to the rotor and timing the intervals between steps of the program device, said motor operating at reduced voltage or full voltage, drive means for the program device including a clutch interposed between the motor and the program device, said clutch including a drive element rotating with said rotor and a driven ferromagnetic element magnetically coupled to said stator, and attracted by the magnetic force in said stator, when the motor is operated at full voltage to engage with and be driven by the drive element, and means biasing the driven clutch element away from the stator with a force suflicient to overcome the magnetic force in the stator when the motor is operated at reduced voltage.
  • a timer according to claim 10 including a switch, and means responsive to the operational state of the clutch to operate the switch.

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US256608A 1963-02-06 1963-02-06 Stepping timer with normal and rapid advance speed control Expired - Lifetime US3246090A (en)

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GB1054413D GB1054413A (ru) 1963-02-06
GB1054414D GB1054414A (ru) 1963-02-06
US256608A US3246090A (en) 1963-02-06 1963-02-06 Stepping timer with normal and rapid advance speed control
DE19641463010 DE1463010A1 (de) 1963-02-06 1964-01-31 Zeitschalteinrichtung

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US256608A US3246090A (en) 1963-02-06 1963-02-06 Stepping timer with normal and rapid advance speed control

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735062A (en) * 1969-04-04 1973-05-22 Mallory & Co Inc P R Extended cycle timer with momentary switch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2913817B1 (de) * 1979-04-05 1980-04-10 Siemens Ag Programmsteuergeraet

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730671A (en) * 1951-03-16 1956-01-10 Mcgraw Electric Co Electro-mechanical control means
US2905239A (en) * 1954-09-30 1959-09-22 Henry G Dietz Co Inc Multiple circuit timer with adjustable time intervals
US2963528A (en) * 1958-10-21 1960-12-06 Exxon Research Engineering Co Isomerization of normal paraffins
US3109073A (en) * 1960-05-02 1963-10-29 Chamberlain & Hookham Ltd Cyclically operated switch control apparatus
US3109074A (en) * 1960-05-02 1963-10-29 Chamberlain & Hookham Ltd Cyclically operated switch control apparatus
US3123683A (en) * 1960-05-02 1964-03-03 Cyclically operated switch control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730671A (en) * 1951-03-16 1956-01-10 Mcgraw Electric Co Electro-mechanical control means
US2905239A (en) * 1954-09-30 1959-09-22 Henry G Dietz Co Inc Multiple circuit timer with adjustable time intervals
US2963528A (en) * 1958-10-21 1960-12-06 Exxon Research Engineering Co Isomerization of normal paraffins
US3109073A (en) * 1960-05-02 1963-10-29 Chamberlain & Hookham Ltd Cyclically operated switch control apparatus
US3109074A (en) * 1960-05-02 1963-10-29 Chamberlain & Hookham Ltd Cyclically operated switch control apparatus
US3123683A (en) * 1960-05-02 1964-03-03 Cyclically operated switch control

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3735062A (en) * 1969-04-04 1973-05-22 Mallory & Co Inc P R Extended cycle timer with momentary switch

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DE1463010A1 (de) 1969-01-30
GB1054413A (ru)

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