US2442497A - Electromagnetically operated timing mechanism - Google Patents

Description

5 1.2238 1, H KELK ET AL 2,442,497

ELECTROMAGNETICALLY OPERATED TIMING MECHANISM Filed Aug. 5, 1945 2 Sheets-Sheet 1.

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ELECTROMAGNETICALLY OPERATED TIMING MECHANISM Filed Aug. 3, 1945 1 2 Sheets-Sheet 2 Q n 0 N n X X X x g 3 I vENToRS /ILLIAM H.H. Km, DENIS OWENBURNS A TTOR/VE (S I 2 3 4 5 6 7 8 9 lOl I l2 l3 |4IS l6 E7 i8 i9 202l2223 2425262728 29308323334353637839404|424344454647484950 Patented June 1, 1948 OFFICE EIiECTROMAGNETICALIZY OPERATED TIMING'MECHANISM William Hyde-Hastings Kelk andaDenis wen- Burns; SouthEarnborough, England Application August 3, 1945, Serial No. 608,678 I'n'Great Britain October 18, 1943 'I-hisinvent-ion relates to improvements in electromagnetically'operated-timingmechanisms: The object of the-invention is the generation of pulses at apredeterminedfundamental -frequency'ior distribution to' apluralityof channels capable of" preselection to provide output pulses at the preselectedtiming intervals in an output circuit.

The inventioncomprises generating pulses of a predetermined fundamental frequency, dis-- tributingthe pulses through a plurality of chairnel-s; selectively connecting any one or more of said channels to an output circuit-to obtain in saidoutput circuit a range-of-pulse frequencies includingthefundamental frequency and submultiples of the fundamental frequency: and employingthe pulses so obtained to actuate electrical devices in timed sequence.

Theiinventi'on will be described with reference to'theaccompanying drawings which show schemati'ca'lly' the arrangement of the circuits.

Fig, .1 is'a diagrammatic view of'a circuit for generating and distributing a fundamental'pulse and'preeselecting one of a plurality of output pulses.

Fig. 2i's an expandedjview of the grouping of contacts of banksT ore-rotary line switch or uniselector 'Iito. provide six sub-multiples of the,

fundamental pulse.

A fundamental pulse may be. generated by the employment/of two; cross connected relays AP andBP. The relay AP provided with acoi'l has a normally open contactiAPlxand the relay BP provided witha coil BP c hasa single; normally closed contact BP. The.

cross-commotion of; the two relays-when current is supplied to the-circuit generates a fundamental pulse, the frequency of which depends on the constants oi' the relays AP andBP andmaybe preferably shunted; by; a; resistance and: capacity;

' merit of the grouping of the contacts of the banks YTS to prevent sparking at the-contacts, which operates a rotary line switch or uniselector T havin a plurality of banks of contacts. arrangement shown in thedrawing' two banks T eachoi- 25 contacts are connected in series with the exception of contact l, and a further two banks T each of 25 contacts connected ingroups receive the output pulses in succession through the contact APE.

The rotary line switch or uniselector T is of known construction and comprises a stepping switch, used for switching impulses to a number ofoutgoing feeds consecutively, consisting of a magneticallycperated spring returned pawl and ratchet mechanism operating on, the, reverse drive principled. e. the switch steps or moves to the next output contact when the magnet is deenergised. The fundamental pulse is transmitted to the two banks T by twowiper arms 15 mounted on a central spindle t and arranged at 180 to each other, thus simulating a single bank of 50 contacts. Thefundamental pulse is also transmitted to the two banks T by two wiper arms t similarly mounted on the spindle so that bothpairsofarms i 73 step in unison on the closing of a control switch F8 to operate a, holdi'ngrelay with contact FR.

The first contact of the banks T is connected in the circuit'controlled by the switch FS and the remaining contacts 2-5il are connected in series and to an independent positive supply so that whenthe wiper arm t has moved from contact lpulseswill continue to be generated on the alternative positive supply line so that should an interrupter contact Y be actuated to open the relay. FR the wiper arms will continue to step until the arm 15 has horned to contact I where it is 'in' position to restart the cycle on a subsequent closing of the switch F5. The arrange- T shown diagrammatically in Fig. 2, provides six output frequencies or pulses Xi, X2; X5; Xi ll. X25 and X5ii all of which are sub-multiples of the fundamental frequency or pulse. Thus if the fundamental frequency i 0.66 sec. and an output pulse of 3 seconds is desired, timing multiple X50 which includes-the first contact A alone, is selected by a rotary preselector switch X. Similarly, if an output frequency orpulse of, 0.12 sec; is-desiredttiming multiple X2 including contacts A, EanelC, i. e., 25' alternate contacts, is selected.

In the v the frequencies available.

tacts. The moving contact system 3: is provided a with a pointer movable over a dial marked with frequency or pulse is transmitted along a line a in each case since the contact A is common to all the frequencies or pulses. v

An output relay with contact OR in the output line a transmits the pulses to the output circuit. This relay also influences the on to oil ratio and in order accurately to follow the timing a low inertia relay should be employed. In order to adjust the on? time of the contacts 0R independently of the adjustment for the cross connected relays the output relay selector switches is possible to provide a large range of available frequencies.

What we claim as our invention and desire to V secure by Letters Patent is:

1. Electromagnetic timing mechanism comprising a rotary switch; electromagnetic means for generating pulses at a predetermined frequency; electromagnetic means for actuating the rotary switch in steps, one stepper pulse gen erated; a selector switch; a timing bank in the rotary switch including a series of contacts and a brush co-operating with said contacts in succession as the rotary switch is advanced in steps, one contact per step in succession; a'connection to the timing bank brush from the pulse generating means whereby pulses are applied to the timing bank contacts one pulse per contact in succession; and said timing bank contacts being connected in groups to the selector switch; whereby output pulses are afiorded at the selector switch at time intervals dependent on the setting of the latter.

succession as the rotary switch is advanced in steps, one contact per step in succession; a connection tothe timing bank brush from the pulse The selected output geneiating'means whereby pulses areapplied to the timing bank contacts one pulse per contact in succession; and said timing bank contacts being connected in groups to the selector switch; whereby output pulses are afiorded at the selector switch at time intervals dependent on the setting of the latter.

3. Electromagnetic timing mechanism comprising supply leads; two relays which are crossconnected for generating pulses at a predeterminedfrequency and have an additional pair of contacts which are opened and closed for eve y pulse generated; a rotary switch; means for ad vancing. the rotary switch in steps one step per pulse generated; a selector switch; a timing bank in the rotary switch including a series of contacts and a brush co-operating with said contacts in succession as the rotary switch is advanced in steps; the timing bank brush being every pulse generated; a rotary switch;means for advancing the rotary switch in steps one step per pulse generated; a selector switch; a hold-in bank in the rotary switch including contacts which are connected together and to one supply lead and a brush co-operating with said contacts in succession as the rotary switch is advanced in steps; a timing bank in the rotary switch including a series of contacts and a brush co-operating with said contacts in succession as the rotary switch is advanced in steps; the timing bank brush being connected in series with the additional pair of contacts of the cross-connected relays with one supply lead whereby pulses are applied to the timing bank contacts one pulse per contact in succession; and said timing bank contacts being connected in groups to the selector switch,'whereby output pulses are afforded at the selector switch at time intervals, dependent on the setting of the latter.

5. Electromagnetic timing mechanism comprising supply leads; a rotary switch; two relays erating with said contacts; means including a magnet coil for advancing the rotary switch in steps one contact of said timing bank per step in succession; said magnet coil being connected in series with one of the additional pairs of contacts of the cross-connected relays with the supply leads, whereby the rotary switch is advanced one step per pulse generated; and the timing bank brush being connected in series with the other of the additional pairs of contacts of the cross-connected relays to one supply lead, whereby pulses are applied to the timing bank contacts one pulse per contact in succession; and said timing bank contacts being connected in groups to the selector switch; whereby output pulses are afforded at the selector switch at time intervals dependent on the setting of the latter.

6. Electromagnetic timing mechanism comprising supply leads; a rotary switch; two relays which are cross-connected for generating pulses at a predetermined frequency and have two additional pairs of contacts which are opened and closed for every pulse generated; a selector switch; a hold-in bank in the rotary switch including contacts which are connected together and to one supply lead and a brush co-operating with said contacts in succession as the rotary switch is advanced in steps; a timing bank in the rotary switch including a series of contacts and a brush co-operating with said contacts; means including a magnet coil for advancing the rotary switch in steps one contact of said timing bank per step in succession; said magnet coil being connected in series with one of the additional pairs of contacts of the cross-connected relays with the supply leads, whereby the rotary switch is advanced one step per pulse generated; and the timing bank brush being connected in series with the other of the additional pairs of contacts of the cross-connected relays to one supply lead,

whereby pulses are applied to the timing bankcontacts one pulse per contact in succession, and said timing bank contacts being connected in groups to the selector switch; whereby output pulses are aflorded at the selector switch at time intervals dependent on the setting of the latter.

7. Electromagnetic timing apparatus comprising supply leads; a starting and stopping circuit including means for closing and opening it and which is connected with one supply lead; two relays which are cross-connected to generate pulses at a predetermined frequency and have two additional pairs of contacts which are opened and closed for every pulse generated; a selector switch; a rotary switch having means including a magnet coil for advancing it in steps one step for each time said magnet coil is energised; a timing bank in said rotary switch including a series of contacts and a brush co-operating with said contacts in succession as the rotary switch is advanced; a hold-inbank in the rotary switch including contacts which are connected together and to said one supply lead, a contact which is connected via the starting and stopping circuit with said one supply lead and which is also connected via one of the additional pairs of contacts of the cross-connected relays with the timing bank brush and a brush co-operating with said contacts as the rotary switch is advanced and which brush is connected via the cross-connected relays with another supply lead; the magnet coil of the means for advancing the rotary switch in steps being connected in series with the other additional pair of contacts of the cross-connected relays between the hold-in bank brush and the other supply lead; and, the contacts of the timing bank being connected in groups with the selector switch; whereby when the starting and stopping circuit is closed pulses are generated by the crossconnected relays, the rotary switch is advanced one step per pulse generated, pulses are applied to the timing bank contacts in succession and these are afforded at the selector switch output pulses at time intervals dependent on which of the groups of said timing bank contacts is selected by the selector switch and whereby when the starting and stopping circuit is open such operation will continue until and unlessthe hold-in bank brush is in co-operation with the hold-in bank contact which is connected via the starting and stopping circuit with a supply lead.

8. Electromagnetic timing mechanism comprising supply leads; a starting and stopping circuit including means for opening and closing it and a hold-in relay for holding it closed and which circuit is connected with one supply lead; two relays which are cross-connected to generate pulses at a predetermined frequency and have two additional pairs of contacts which are opened and closed for every pulse generated; a selector switch; a rotary switch having means including a magnet coil for advancing it in steps one step for each time said magnet coil is energised; a timing bank in said rotary switch including a series of contacts and a brush co-operating with said contacts in succession as the rotary switch is advanced; a hold-in bank in the rotary switch including contacts which are connected together and to said one supply lead, a contact which is connected via the starting and stopping circuit with said one supply lead and which is also connected via one of the additional pairs of contacts of the cross-connected relays with the timing bank brush and a brush co-operating with said contacts as the rotary switch is advanced and which brush is connected via the cross-connected relays with another supply lead; the magnet coil of the means for advancing the rotary switch in steps being connected in series with the other additional pair of contacts of the cross-connected relays between the hold-in bank brush and the other supply lead; and, the contacts of the timing bank being connected in groups with the selector switch; whereby when the starting and stopping circuit is closed pulses are generated by the crossconnected relays, the rotary switch is advanced one step per pulse generated, pulses are applied to the timing bank contacts in succession and these are afforded at the selector switch output pulses at time intervals dependent on which of the groups of said timing bank contacts is selected by the selector switch and whereby when the starting and stopping circuit is open such operation will continue until and unless the hold-in bank brush is in co-operation with the hold-in bank contact which is connected via the starting and stopping circuit with a supply lead.

WILLIAM HYDE HASTINGS KELK. DENIS OWEN BURNS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 929,602 Krum July 27, 1909 1,424,328 Verrando Aug. 1, 1922 1,653,736 Shackleton Dec. 27, 1927 1,957,672 Saunders May 8, 1932 2,144,033 Root Jan. 17, 1939 2,206,660 Bryce July 2, 1940 2,384,792 Brown Sept. 18, 1945

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