US3215919A - Cam switching mechanism for motor control system - Google Patents

Cam switching mechanism for motor control system Download PDF

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Publication number
US3215919A
US3215919A US43560A US4356060A US3215919A US 3215919 A US3215919 A US 3215919A US 43560 A US43560 A US 43560A US 4356060 A US4356060 A US 4356060A US 3215919 A US3215919 A US 3215919A
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Prior art keywords
contacts
completion
cam
motor
switching mechanism
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Expired - Lifetime
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US43560A
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English (en)
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Holzer Walter
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • 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

Definitions

  • Programme switching mechanisms are known which permit the provision of different operating speeds of actuating the contact system.
  • systems are known with one or more motors which drive a stepping mechanism, and according to the selection of various driving speeds, the speed of the switching action of the contact system is altered.
  • a stepping mechanism with an auxiliary contact system which, after partial completion of a step, changes the speed of the motor driving the stepping mechanism.
  • the auxiliary contact system switches over to a rapid drive, whereby the programme switch mechanism at once enters the next stepping position.
  • a further feature of the invention is that the auxiliary contact system returns the drive to the original speed after completion of the switch step; i.e. after completion of a shortened step the drive continues to drive the stepping switch mechanism at its normal speed.
  • auxiliary contacts prefferably switched on either by hand or by programme contacts during the programme sequence.
  • FIG. 1 is a schematic circuit diagram showing several mechanical elements to be employed in side view and thus illustrates the cooperation thereof with the circuit network, and
  • FIG. 2 illustrates way-time diagrams of a step switching device operated in accordance with the invention.
  • FIG. 1 there is a switch mechanism including a cam 1 raising a pivotable lever 2 against the force of a tension spring 3.
  • Lever 2 has a pawl 2a engaging the teeth of a ratchet wheel 11 for step switching the program switching mechanism 15 by one step for each turn of the cam 1.
  • the step switching mechanism is driven from ratchet Wheel 11 via a shaft 4.
  • the program contact system is only diagrammatically represented.
  • Cam 1 is driven by a motor 12 connected to a voltage source via series resistors 13, 14 constituting a control circuit for the motor; the resistors may be short-circuited by auxiliary contacts 7, 5, 6. As was said above, auxiliary contacts may be switched on either manually or by the program control.
  • any other system can be used which converts the continuous drive motion of the motor into a stepped motion of the programme contact system.
  • auxiliary contact system is indicated by 5 and 6.
  • contact 7 will (after a partial turn) first engage contact 5 and thereafter contact 6.
  • These contacts are now used to convert the drive of the cam 1 to higher speed by short circuiting resistors 13 and 14 and the cam then rapidly completes its rotary movement, whereby the period of time for completion of the step is reduced. If, however, a lesser reduction of the step is desired, one may selectively use only the contact 5 which bridges the resistor 13 for the switch-over of the drive speed. It is characteristic of the invention that after the completion of the switch step all the auxiliary contacts are re-opened because lever 2 drops at edge 1 of cam 1. Thus, motor 12 and cam 1 regain their original turning speed.
  • FIG. 2 is a motion diagram of the stepping mechanism according to FIG. 1.
  • the up and down movements of the pawl 2a normally together take the same length of time 8.
  • the lower diagram in FIG. 2 shows in the second and third step a first reduction of duration for such steps.
  • the contacts 5 and 7 close, thus bridging resistor 13 and the motor 12 drives the cam at a higher speed than before. This causes a reduction of the normal step of length 8 to the reduced length of step 9.
  • auxiliary connection is unimportant. It can be developed in the manner represented or it can be a sliding contact system or an arrangement of several key contacts otfset at the particular turning angle.
  • a control device for automatic washing machines having steps operating at variable duration, the combination comprising a rotatable means, an electric motor drivingly connected to said means, a plurality of resistors connected in series with said motor and electric contacts selectively bridging said resistors, said means closing said contacts successively after completion of a portion of a step and opening the contacts upon completion of a step; means operated by said first means, stepwise driving a shaft upon completion of a step.
  • a control device for automatic washing machines having variable stepping speeds comprising a rotatable cam, an electric motor drivingly connected to said cam, a resistor connected in series with said motor, and electric contacts bridging said resistor, said cam closing said contacts and thereby increasing the speed of rotation of the motor and completion of a portion of a step, said cam opening the contacts upon completion of a step, means operated by said cam, stepwise driving a shaft also upon completion of a step.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Push-Button Switches (AREA)
  • Motor And Converter Starters (AREA)
US43560A 1959-07-25 1960-07-18 Cam switching mechanism for motor control system Expired - Lifetime US3215919A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH0037019 1959-07-25

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US3215919A true US3215919A (en) 1965-11-02

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US43560A Expired - Lifetime US3215919A (en) 1959-07-25 1960-07-18 Cam switching mechanism for motor control system

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US (1) US3215919A (de)
DE (1) DE1410152B2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286149A (en) * 1964-02-24 1966-11-15 Gen Electric Control means for electric motor start winding
US3959703A (en) * 1974-12-24 1976-05-25 Sidney Rosen Speed control for pump of filling machines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060437A (en) * 1933-09-07 1936-11-10 Harley Stanley Jaffa Electric motor control
GB478124A (en) * 1936-06-12 1938-01-12 English Electric Co Ltd Improvements in electric regulators
US2627593A (en) * 1950-03-01 1953-02-03 Tietig Chester Cam-actuated speed control for cyclically operated machines
US2798195A (en) * 1954-04-16 1957-07-02 Lembo Juan Jose Time switch and speed variator for electric motors

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060437A (en) * 1933-09-07 1936-11-10 Harley Stanley Jaffa Electric motor control
GB478124A (en) * 1936-06-12 1938-01-12 English Electric Co Ltd Improvements in electric regulators
US2627593A (en) * 1950-03-01 1953-02-03 Tietig Chester Cam-actuated speed control for cyclically operated machines
US2798195A (en) * 1954-04-16 1957-07-02 Lembo Juan Jose Time switch and speed variator for electric motors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286149A (en) * 1964-02-24 1966-11-15 Gen Electric Control means for electric motor start winding
US3959703A (en) * 1974-12-24 1976-05-25 Sidney Rosen Speed control for pump of filling machines

Also Published As

Publication number Publication date
DE1410152A1 (de) 1968-10-03
DE1410152B2 (de) 1972-10-05

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