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US4989756: Dispensing apparatus

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Filing Information

Inventor(s) Mitsuru Kagamihara · Minoru Kawagishi · Nobuto Yamazaki ·
Assignee(s) Kabushiki Kaisha Shinkawa ·
Attorney/Agent(s) Koda and Androlia ·
Primary Examiner Skaggs; H. Grant ·
Assistant Examiner Kenneth Noland ·
Application Number US7306346
Filing date 02/03/1989
Issue date 02/05/1991
Predicted expiration date 02/03/2009
U.S. Classifications 222/55  · 222/638  ·
International Classifications B67D 508  ·
Kind CodeA
International Classifications 22252;55;57;14;638;639;644;61;649 ·
Foreign Priority JP24199286 - 10/14/1986 ·
3 Claims, No Drawings


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.

Independent Claims | See all claims (3)

  1. 1. A paste-dispensing apparatus comprising:a syringe which holds paste therein;an air supply source which supplies air under a positive pressure to said syringe;a dispensing electromagnetic valve provided between said syringe and air supply source, said valve being connected to said syringe via a first pipe and to said air supply source via a second pipe so that said syringe and air supply source communicate with each other when paste is dispensed;a first pressure sensor which measures the pressure inside of said first pipe;a second pressure sensor which measures the pressure inside of said second pipe; anda control section wherein pressures measured by said first and second pressure sensors are input, said control section outputting a voltage signal that actuates said dispensing electromagnetic valve so that said first and second pipes communicate with each other when the dispensing of paste is initiated, said control section further providing a means for controlling an output time of said voltage signal in accordance with changes in the time required for the pressure measured by said first pressure sensor to reach a preset pressure after said first and second pipes have been connected.
  2. 2. A paste-dispensing apparatus comprising:a syringe which holds paste therein;an air supply source which supplies air under a positive pressure to said syringe;a dispensing electromagnetic valve provided between said syringe and air supply source, said valve being connected to said syringe via a first pipe and to said air supply source via a second pipe so that said syringe and air supply source communicate with each other when paste is dispensed;an air suction source connected to said dispensing electromagnetic valve via a third pipe so that said air suction source communicates with said first pipe when said first pipe and second pipe do not communicate with each other, said air suction source supplying air under negative pressure;a first pressure sensor which measures the pressure inside of said first pipe;a second pressure sensor which measures the pressure inside of said second pipe; anda control section wherein pressures measured by said first and second pressure sensors are input, said control section outputting a voltage signal that actuates said dispensing electromagnetic valve so that said first and second pipes communicate with each other when the dispensing of paste is initiated, and said control section further controlling an output time of said voltage signal in accordance with changes in the time required for the pressure measured by said first pressure sensor to reach a preset pressure after said first and second pipes have communicated.
  3. 3.3. A paste-dispensing apparatus comprising:a syringe which holds paste therein;an air supply source which supplies air under a positive pressure to said syringe;a dispensing electromagnetic valve provided between said syringe and air supply source, said valve being connected to said syringe via a first pipe and to said air supply source via a second pipe so that said syringe and air supply source communicate with each other when paste is dispensed;a suction electromagnetic valve connected to said dispensing electromagnetic valve via a third pipe so that said suction electromagnetic valve communicates with said first pipe when said first pipe and second pipe do not communicate with each other;an air suction source connected to said suction electromagnetic valve, said air suction source supplying air under a negative pressure to said third pipe;a first pressure sensor which measures the pressure inside of said first pipe;a second pressure sensor which measures the pressure inside of said second pipe; anda control section wherein pressures measured by said first and second pressure sensors are input, said control section outputting a voltage signal that actuates said dispensing electromagnetic valve so that said first and second pipes communicate with each other when dispensing of paste is initiated, controlling an output time of said voltage signal in accordance with changes in the time required for the pressure measured by said first pressure sensor to reach a preset pressure after said first and second pipes have communicated with each other, and outputting a voltage signal to said suction electromagnetic valve so that said third pipe and air suction source communicate with each other simultaneously or immediately prior to said first pipe communicates with said second pipe.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US4580698 Pebco, Inc. Ladt et al. Apr 1986
US4613059 Nordson Corporation Merkel Sep 1986
US4830219 Nordson Corporation Siemann May 1989

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