Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1989-02-03
1991-02-05
Skaggs, H. Grant
Dispensing
Automatic control
Constant weight, volume or pressure control by output
222638, 425146, B67D 508
Patent
active
049897560
ABSTRACT:
A paste-dispensing apparatus for bonding machines, etc., which constantly dispenses a fixed amount of paste, glue, etc. regardless of the amount remaining in a syringe and detects the amount of paste remaining in the syringe, including an air supply which supplies air under positive pressure to the syringe, a dispensing valve installed between the syringe and the air supply and connected to the syringe via a first pipe and to the air supply via a second pipe so that the syringe and the air supply communicate with each other when the paste is discharged, a first pressure sensor which measures the pressure inside the first pipe, a second pressure sensor which measures the pressure inside the second pipe, and a controller. Pressure values measured by the first and second pressure sensors are supplied to the controller so that the controller outputs a signal which actuates the dispensing valve so that the first and second pipes communiate when the paste is discharged. The controller further controls the time for outputting the signal in accordance with the difference in the time required for the pressure measured by the first pressure sensor to reach a preset pressure level after the first and second pipes have communicated with each other.
REFERENCES:
patent: 4580698 (1986-04-01), Ladt et al.
patent: 4613059 (1986-09-01), Merkel
patent: 4830219 (1989-05-01), Siemann
Kagamihara Mitsuru
Kawagishi Minoru
Yamazaki Nobuto
Kabushiki Kaisha Shinkawa
Noland Kenneth
Skaggs H. Grant
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