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    Controlled rate dispenser
    1.
    发明授权
    Controlled rate dispenser 失效
    控制率分配器

    公开(公告)号：US3574554A

    公开(公告)日：1971-04-13

    申请号：US3574554D

    申请日：1969-06-02

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： BERRY EDWARD A ,  BARTER LE ROY D

    IPC: G01N31/16 ,  G05D21/02 ,  G01N31/18

    CPC classification number: G01N31/16 ,  G05D21/02

    Abstract: THERE IS DISCLOSED A DISPENSING APPARATUS HAVING A CONTROLLED DISPENSER MECHANISM FOR ADDING A FIRST SUBSTANCE TO A SECOND SUBSTANCE THEREBY FORMING A MIXTURE AT A RATE DETERMINED BY A PRESET MIXTURE END POINT ADJUSTMENT. A MIXTURE SENSOR IS CONNECTED TO A COMPARATOR TO PRODUCE A COMPARATOR OUTPUT SIGNAL WHEN THE SENSOR SIGNAL EXCEEDS A PRESET MIXTURE END POINT LEVEL. THE COMPARATOR OUTPUT SIGNAL IS CONNECTED TO ACTIVATE A SWITCHING DEVICE WHEREBY THE DISPENSER MECHANISM IS DISCONNECTED FROM AN ACTIVATING SOURCE OF ENERGY AND CONNECTED TO AN ENERGY DISCHARGE DEVICE. AN ENERGY STORAGE DEVICE IS ATTACHED TO THE DISPENSER MECHANISM AND BY THE ACTIVATED SWITCH DEVICE IS CONNECTED TO THE ENERGY DISCHARGE DEVICE TO PROVIDE A DECAYING SOURCE OF ENERGY TO THE DISPENSER MECHANISM THEREBY SLOWING THE DISPENSING RATE. IN RESPONSE TO THE SENSOR SIGNAL DROPPING BELOW THE MIXTURE END POINT, THE SOURCE OF ENERGY IS AGAIN CONNECTED BY THE SWITCH DEVICE TO THE DISPENSER MECHANISM. A TIMED DISCONNECT IS CONNECTED TO THE COMPARATOR OUTPUT AND IN RESPONSE TO THE SENSOR SIGNAL EXCEEDING THE MIXTURE END POINT LEVEL FOR A PRESET END POINT INTERVAL DISCONNECTS THE DISPENSER MECHANISM FROM THE SWITCH DEVICE TO END THE DISPENSING ACTION UNTIL RESET FOR THE NEXT CYCLE.

    Oven temperature control stabilizing network
    5.
    发明授权
    Oven temperature control stabilizing network 失效
    烤箱温度控制稳定网络

    公开(公告)号：US3349223A

    公开(公告)日：1967-10-24

    申请号：US40275964

    申请日：1964-10-09

    Applicant: BECKMAN INSTRUMENTS INC

    Inventor： BARTER LE ROY D

    IPC: G05D23/24

    CPC classification number: G05D23/24 ,  G05D23/1906

    Abstract: 1,083,859. Automatic control systems. BECKMAN INSTRUMENTS Inc. Sept. 27, 1965 [Oct. 9, 1964], No. 40985/65. Heading G3R. An automatic control system for speed or temperature in which provides rapid correction for large deviations and finer control for small deviations comprises, in the embodiment described a thermistor 12 in an A. C. bridge connected to an A. C. amplifier 18 the output of which is passed through a demodulator 28 to a decoupling network 54, 56, 58 controlling a transistor 72. Also fed from the amplifier is a CR circuit 62, 66, 68 having a large time constant compared with an oven to be heated, the voltage across the capacitor 62 being arranged to represent the average heater power for isothermal conditions. For large temperature deviations the output of amplifier 18 will be large enough for a Zener diode 69 to conduct hence the voltage on capacitor 62 will rise relatively quickly. A smaller capacitor 70 is also connected across the amplifier output and will rapidly follow transient temperature fluctuations. In this condition the difference voltage between capacitors 62, 70 appearing across resistors R66, R68 also controls the transistor 72. This regulates the charging current of another capacitor 74 which discharges through a unijunction transistor 78 into a transformer primary winding 88 supplying a firing potential to thyristors 92, 94 in series with a heater 102. The arrangement may alternatively control the output of a lamp whose output is detected by a photo-sensing device.

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