US2593964A - Electronic timer - Google Patents
Electronic timer Download PDFInfo
- Publication number
- US2593964A US2593964A US163257A US16325750A US2593964A US 2593964 A US2593964 A US 2593964A US 163257 A US163257 A US 163257A US 16325750 A US16325750 A US 16325750A US 2593964 A US2593964 A US 2593964A
- Authority
- US
- United States
- Prior art keywords
- capacitor
- relay
- time
- discharge device
- cool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000003990 capacitor Substances 0.000 description 50
- 238000010438 heat treatment Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009499 grossing Methods 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/248—Electric supplies using discharge tubes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/288—Modifications for introducing a time delay before switching in tube switches
Definitions
- My invention relates to electrical apparatus and more particularly to electronic timer circuits.
- Timing of closely related cycles In some operations where a material is to be welded or clamped, heated, cooled and released, the time intervals involved may be of the order of fractions of seconds. The total time of the operation as well as the ratio of the various time intervals is often critical. Electronic timers are peculiarly well adapted for timing these operations.
- I provide a circuit including an electric discharge device having at least an anode, a cathode and a control electrode.
- a pair of timing networks are connected in the control circuit of said discharge device. Suitable means are provided "to initiate operation of the first timing network to produce a first timed interval, which is terminated by conduction of said discharge device. Operation of the second timing network to produce a second timed interval, is initiated responsive to conduction of said discharge device. This second timed interval i terminated by cut-off of said discharge device.
- the timing networks are so arranged that one variable resistance determines the ratio of the timed intervals, and another variable resistance determines the total length of the timed intervals. Thus a single electric discharge device is utilized to produce two consecutive timed cycles.
- the press comprises a stationary member [3 and a movable member l5.
- One member contains a suitable heating element shown for convenience as a resistor l1 supplied from the secondary winding [9 of a transformer 2
- the movable element of the press may be operated by an air solenoid or a hydraulic device, or any suitable means, but for convenience is shown being operated by the armature of a press relay 3!.
- the energizing coil 33 of the press relay 31 is connected in series with a start switch 35 across the power supply buses 21, 29.
- a timer network indicated generally at 31 includes a single electric discharge device which may be a thyratron 39 having an anode M, a cathode 43 and a control element 45.
- a cathode 43 of this thyratron 39 is connected to one of the power supply buses 21 and the anode M is connected through a, resistance 41 and the operating coil 49 of the cool relay 5
- a smoothing capacitor 53 is connected across this resistance 41 and the cool relay operating coil 49.
- the smoothing capacitor 53 and resistance 51 could be replaced by a small selenium rectifier if desired.
- the usual stabilizing capacitor 55 is connected from the thyratron control element 45 to its cathode 43.
- the timer circuit includes a capacitor 5'! for timing heat time and a capacitor 59 for timing 0001 time.
- the heat time'capacitor 51 is connected from the thyratron cathode 53 through first normally closed contacts 6
- the cool time capacitor 59 is connected from the thyratron cathode 53 through first normally open contacts 55 of .the cool time relay 5
- the cool time capacitor 59 is shunted by second normally closed contacts B1 of the cool time relay 5!.
- a dropping resistance 59 is connected in series with a ratio potentiometer ll across the power supply buses 27, 29.
- the heat time capacitor 51 is charged by a circuit which may be traced from the movable element 53 of the ratio potentiometer ll through a rectifier '35, a resistance Ti and normally closed contacts i9 of the heat relay through the heat time capacitor 51 to the power supply bus 2?.
- the discharge circuit of the heat time capacitor 57 may be traced from a power supply bus 2? through second normally closed contacts 5? or the cool relay 5
- the cool time capacitor 59 is charged by a circuit which may be traced from the mov able element Til-of the ratio potentiometer H through the rectifier l5, resistance ll, normally closed contacts i9 of the heat relay 25, total time potentiometer 83, resistance 5
- the discharge resistances Si, 83 of the heat time capacitor 51' are the charge resistors of the cool time capacitor 59.
- the energizing circuit for the heat time relay coil 85 may be traced from one power supply bus 21 through the normally open contacts 89 of the press relay 3
- the start switch 55 is shunted by second normally open contacts 53 of the cool relay 5
- the start switch is also shunted by second normally open contacts 95 of the heat relay 25.
- the start switch 35 is closed to initiate an operation.
- the press relay coil 33 is energized closing the press I i and the normally open contact 89 of the press relay 3!.
- the operating coil 85 of the heat relay 25 is now energized and its first normally open contacts 25 close the heating circuit while its second normally open contacts 95 lock the start switch 35 in, and its first normally closed contacts 79 open the charging circuit of the heat time capacitor 51.
- the heat time capacitor begins to discharge through the total time potentiometer 55, a resistance 5
- remove the heat time capacitor 57 from the thyratron bias circuit while first normally open contacts 65 of the cool time relay 5
- deenergize the heat relay 25 and open the press heating circuit.
- the start switch lock previously provided by second normally open contacts 95 of the heat relay 25 is now provided by second normally open contacts 93 of the cool relay 5
- Normally closed contacts 19 of theheat relay 25 energize the charging circuit for the cool time capacitor 59.
- the heating time is determined by the length of. time it takes the heat time capacitor 57 to discharge through the total time potentiometer and resistor 8
- Adjustment of the ratio potentiometer if to increase the charge on the heat time capacitor 51 and thus increase the heat time will also increase the charging rate of the cool time capacitor 59 and decrease the cool time.
- the ratio potentiometer then comprises a single control for adjusting the ratio or heat time to cool time.
- Adjustment of the total time potentiometer 83 to decrease the discharge rate of the heat time capacitor 57 to increase the heat time will also decrease the charging rate of the cool time capacitor59 and increase the cool time.
- the total time potentiometer 83 then is a single control for adjusting the heat and cool time together and thus the total time of the operation.
- an electric discharge device 7 having an anode, a cathode, and a control electrode, a first capacitor connected in series with first normally closed contacts and said control electrode, a second capacitor connected in series with normally opensecondcontacts and said control electrode, third normally closed contacts connected in shunt with said second capacitor, charging means connected in series with fourth normally closed contacts across said first capacitor and in series with said fourth contacts and a resistance across said second capacitor, means to effect opening said fourth contacts whereby said first capacitance discharges through said resistance and said discharge device is rendered conductive, means responsive to conduction of said discharge device to actuate said first, second, and third contacts and to effect closing of said fourth contacts, whereby said first capacitor is disconnected from said control element, and said second capacitor is connected to said control electrode and its shunt removed and said charging means is effective to charge said second capacitor through said resistance to render said discharge device non-conductive.
- an electric discharge device in an initial state with reference to conduction a first network comprising a first capacitor for timing a first interval, a second network comprising a second capacitor for timing a second interval, a common source of potential for charging said capacitors, means to vary the magnitude of said charging potential, means to actuate said first network to initiate the timing of said first interval, means operative upon expiration of said first interval to render said discharge device in the opposite conductive state, means responsive to the change in conductive state in said discharge device for initiating said second timing interval, and means responsive to expiration of said second interval to render said discharge device in said initial conductive state.
- an electric discharge device in an initial state with reference to conduction a first network comprising a first capacitor for timing a first interval, a second network comprising a second capacitor for timing asecond interval, a common source of potential for charging said capacitors, means to vary the magnitude of said charging potential, a variable resistance common to the discharging circuit of said first capacitor and the charging circuit of said second capacitor, means to actuate said first network to initiate the timing of said first interval, means operative upon expiration of said first interval to render said discharge device in the opposite conductive state, means responsive to the change in conductive state in said discharge device for initiating said second timing interval, and means responsive to expiration of said second interval to render said discharge device in said initial conductive state.
- a first relay switch means for momentarily causing energization of said first relay, a second relay, first contacts actuable responsive to energization of said first relay to cause energization of said second relay, second contacts actuable responsive to energization of said second relay to shunt said switch means, an electric discharge device having an anode, a third relay having energizing means connected in circuit with said anode, third and fourth. contacts actuable responsive to a change in the state of conduction of said discharge device, said third contacts being connected to shunt said switch means, and said fourth contacts being connected to cause deenergization of said second relay.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermotherapy And Cooling Therapy Devices (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE503191D BE503191A (ja) | 1950-05-20 | ||
US163257A US2593964A (en) | 1950-05-20 | 1950-05-20 | Electronic timer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US163257A US2593964A (en) | 1950-05-20 | 1950-05-20 | Electronic timer |
Publications (1)
Publication Number | Publication Date |
---|---|
US2593964A true US2593964A (en) | 1952-04-22 |
Family
ID=22589164
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US163257A Expired - Lifetime US2593964A (en) | 1950-05-20 | 1950-05-20 | Electronic timer |
Country Status (2)
Country | Link |
---|---|
US (1) | US2593964A (ja) |
BE (1) | BE503191A (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2831111A (en) * | 1955-06-28 | 1958-04-15 | Gen Electric | Electric timer |
US2926248A (en) * | 1957-03-22 | 1960-02-23 | Mong Maurice D De | Time delay monostable electronic control unit |
US3089948A (en) * | 1952-02-21 | 1963-05-14 | Westinghouse Electric Corp | Electric discharge apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907279A (en) * | 1929-04-15 | 1933-05-02 | Ericsson Telefon Ab L M | Electrical timing arrangement |
US2165048A (en) * | 1937-08-26 | 1939-07-04 | Westinghouse Electric & Mfg Co | Electric discharge apparatus |
US2169023A (en) * | 1935-01-31 | 1939-08-08 | Westinghouse Electric & Mfg Co | Power control system |
US2431284A (en) * | 1943-11-20 | 1947-11-18 | Westinghouse Electric Corp | Pulsation timing system |
US2454167A (en) * | 1946-08-22 | 1948-11-16 | Westinghouse Electric Corp | Counting circuit |
-
0
- BE BE503191D patent/BE503191A/xx unknown
-
1950
- 1950-05-20 US US163257A patent/US2593964A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1907279A (en) * | 1929-04-15 | 1933-05-02 | Ericsson Telefon Ab L M | Electrical timing arrangement |
US2169023A (en) * | 1935-01-31 | 1939-08-08 | Westinghouse Electric & Mfg Co | Power control system |
US2165048A (en) * | 1937-08-26 | 1939-07-04 | Westinghouse Electric & Mfg Co | Electric discharge apparatus |
US2431284A (en) * | 1943-11-20 | 1947-11-18 | Westinghouse Electric Corp | Pulsation timing system |
US2454167A (en) * | 1946-08-22 | 1948-11-16 | Westinghouse Electric Corp | Counting circuit |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3089948A (en) * | 1952-02-21 | 1963-05-14 | Westinghouse Electric Corp | Electric discharge apparatus |
US2831111A (en) * | 1955-06-28 | 1958-04-15 | Gen Electric | Electric timer |
US2926248A (en) * | 1957-03-22 | 1960-02-23 | Mong Maurice D De | Time delay monostable electronic control unit |
Also Published As
Publication number | Publication date |
---|---|
BE503191A (ja) |
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