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A movable lid is mounted to a valve body movably in an up-and down direction toward and away from the valve body whereby the valve body is lowered to be open against force of a spring by pressing a suction nozzle of an electric vacuum cleaner onto the movable lid and at the same time an exhaust of a

A movable lid is mounted to a valve body movably in an up-and down direction toward and away from the valve body whereby the valve body is lowered to be open against force of a spring by pressing a suction nozzle of an electric vacuum cleaner onto the movable lid and at the same time an exhaust of a bag may be carried out. After the exhaust, by moving the suction nozzle away from the movable lid, the movable lid may be moved upwards to place its original position the restoring force of the spring, so that the valve body may be opened.

대표청구항 ▼

A movable lid is mounted to a valve body movably in an up-and down direction toward and away from the valve body whereby the valve body is lowered to be open against force of a spring by pressing a suction nozzle of an electric vacuum cleaner onto the movable lid and at the same time an exhaust of a

A movable lid is mounted to a valve body movably in an up-and down direction toward and away from the valve body whereby the valve body is lowered to be open against force of a spring by pressing a suction nozzle of an electric vacuum cleaner onto the movable lid and at the same time an exhaust of a bag may be carried out. After the exhaust, by moving the suction nozzle away from the movable lid, the movable lid may be moved upwards to place its original position the restoring force of the spring, so that the valve body may be opened. d supply reel motor and said take-up reel motor, said controller: measures said rotational angular displacement of said supply reel from said supply tachometer; measures said rotational angular displacement of said take-up reel from said take-up tachometer; determines from said measured rotational angular displacement of said supply reel, the rotational angular velocity of said supply reel; determines from said determined rotational angular velocity of said supply reel, a linear speed for said tape at said supply reel; determines from said measured rotational angular displacement of said take-up reel, the rotational angular velocity of said take-up reel; determines from said determined rotational angular velocity of said take-up reel, a linear speed for said tape at said take-up reel; compares said determined linear speed for said tape at said supply reel to said determined linear speed for said tape at said take-up reel, to determine a delta velocity between said linear speeds; and operates at least one of said supply reel motor and said take-up reel motor in accordance with a function of said delta velocity to provide a torque to at least one of said supply reel and said take-up reel tending to reduce said delta velocity. 2. The tension control system of claim 1, wherein said controller operates said at least one reel in accordance with a function of said delta velocity, of the current inertial characteristics of said at least one reel, and of the current radius of tape of said at least one reel. 3. The tension control system of claim 2, wherein said controller determines said linear speed for said tape at each of said supply reel and said take-up reel by determining said linear speed from said rotational angular velocity of each said reel as a function of the current radius of tape of each said reel. 4. The tension control system of claim 1, wherein said controller operates said supply reel motor and said take-up reel motor in accordance with a function of said delta velocity to provide equal and opposite torques to said supply reel and said take-up reel tending to reduce said delta velocity. 5. A tension control system for providing dynamic tension control for tape transported along a tape path between a supply reel and a take-up reel, said supply reel driven by a supply reel motor, said take-up reel driven by a take-up reel motor, comprising: a supply tachometer for measuring the rotational angular displacement of said supply reel; a take-up tachometer for measuring the rotational angular displacement of said take-up reel; a tape tension transducer mounted in said tape path for measuring the tension for said tape in said tape path; and a controller for operating said supply reel motor and said take-up reel motor, said controller: measures said tension for said tape in said tape path from said tape tension transducer; determines whether said measured tension is within a predetermined range of a nominal tension; and, if said measured tension is within said predetermined range of said nominal tension, measures said rotational angular displacement of said supply reel from said supply tachometer; measures said rotational angular displacement of said take-up reel from said take-up tachometer; determines from said measured rotational angular displacement of said supply reel, the rotational angular velocity of said supply reel; determines from said determined rotational angular velocity of said supply reel, a linear speed for said tape at said supply reel; determines from said measured rotational angular displacement of said take-up reel, the rotational angular velocity of said take-up reel; determines from said determined rotational angular velocity of said take-up reel, a linear speed for said tape at said take-up reel; compares said determined linear speed for said tape at said supply reel to said determined linear speed for said tape at said take-up reel, to determine a delta velocity between said linear speeds; and operates at least one of said supply reel motor and said take-up reel motor in accordance with a function of said delta velocity to provide a torque to at least one of said supply reel and said take-up reel tending to reduce said delta velocity. 6. A tension control system for providing dynamic tension control for tape transported along a tape path between a supply reel and a take-up reel, said supply reel driven by a supply reel motor, said take-up reel driven by a take-up reel motor, comprising: a supply tachometer for measuring the rotational angular displacement of said supply reel; a take-up tachometer for measuring the rotational angular displacement of said take-up reel; and a controller for operating said supply reel motor and said take-up reel motor, said controller: A) establishes a nominal tension on said tape: 1) measures said rotational angular displacement of said supply reel from said supply tachometer; 2) derives reel radii and tape inertial values corresponding thereto; 3) measures said rotational angular displacement of said take-up reel from said take-up tachometer; 4) derives reel radii and tape inertial values corresponding thereto; and 5) operates said supply reel motor and said take-up reel motor to apply a nominal tension to said tape; and B) maintains tension control tending to maintain said tape tension constant: 1) determines from said measured rotational angular displacement of said supply reel, the rotational angular velocity of said supply reel; 2) determines from said determined rotational angular velocity and said derived reel radii values of said supply reel, a linear speed for said tape at said supply reel; 3) determines from said measured rotational angular displacement of said take-up reel, the rotational angular velocity of said take-up reel; 4) determines from said determined rotational angular velocity and said derived reel radii values of said take-up reel, a linear speed for said tape at said take-up reel; 5) compares said determined linear speed for said tape at said supply reel to said determined linear speed for said tape at said take-up reel, to determine a delta velocity between said linear speeds; and 6) operates at least one of said supply reel motor and said take-up reel motor in accordance with a function of said delta velocity and said derived inertial values to provide a torque to at least one of said supply reel and said take-up reel tending to reduce said delta velocity. 7. Apparatus for transporting a length of tape between a supply reel and a take-up reel, comprising: a supply reel motor for rotating said supply reel; a take-up reel motor for rotating said take-up reel; a supply tachometer for measuring the rotational angular displacement of said supply reel; a take-up tachometer for measuring the rotational angular displacement of said take-up reel; and a controller for operating said supply reel motor and said take-up reel motor, said controller: measures said rotational angular displacement of said supply reel from said supply tachometer; measures said rotational angular displacement of said take-up reel from said take-up tachometer; determines from said measured rotational angular displacement of said supply reel, the rotational angular velocity of said supply reel; determines from said determined rotational angular velocity of said supply reel, a linear speed for said tape at said supply reel; determines from said measured rotational angular displacement of said take-up reel, the rotational angular velocity of said take-up reel; determines from said determined rotational angular velocity of said take-up reel, a linear speed for said tape at said take-up reel; compares said determined linear speed for said tape at said supply reel to said determined linear speed for said tape at said take-up reel, to determine a delta velocity between said linear speeds; and operates at least one of said supply reel mot