초록 ▼

Presented is a method and apparatus for precision control of work fluids in a squeezable tube that has no surge of work material during the shut off closing of the tube which is accomplished by a compensator moving simultaneously and oppositely to the shut off member movement, each of the compensato

Presented is a method and apparatus for precision control of work fluids in a squeezable tube that has no surge of work material during the shut off closing of the tube which is accomplished by a compensator moving simultaneously and oppositely to the shut off member movement, each of the compensator and the shut off member having different stroke lengths and tube engagable surface areas which effectively keep the internal volume of the tube the same. The method and apparatus are useful standing alone, in coordination with precision positive displacement pumping under computer control which is also presented, and as a part of sequential or simultaneous movement of a valve/pump dispensing head coordinated with a stationary or movable work piece to provide exceedingly fine control dispensing. Suckback between dispensing shots is coordinated with shut off and movements of inlet, outlet and dispensing members to afford operator programmable dispensing with precision and without drip.

대표청구항 ▼

A high precision positive displacement squeeze tube pump apparatus comprising: (a) tube means having first and second spaced end means and characterized as: (i) being hollow and having walls formed of resilient material, (ii) forming a closed pathway for flow of a flowable work material therethrough

A high precision positive displacement squeeze tube pump apparatus comprising: (a) tube means having first and second spaced end means and characterized as: (i) being hollow and having walls formed of resilient material, (ii) forming a closed pathway for flow of a flowable work material therethrough, (iii) having its first end associated with a source of flowable work material, and (iv) having its second end associated with means for receiving said flowable work material after passage through said tube means, and (b) flow control means for controlling the flow of work material through said tube means, said flow control means being characterized as comprising: (i) first, second, third and fourth cooperating spaced tube squeezing means located intermediate said first and second spaced end means of said tube means and engagable with said tube means for effecting control of the flow of work material therethrough, (ii) said first tube squeezing means having open and closed positions, being movable between said open and closed positions, and located near said first end means to control ingress of work material to said tube means, (iii) said second tube squeezing means being spaced from said first tube squeezing means, having open and closed positions, and being movable between said open and closed positions for controlling exiting of said flowable work material from said tube means, (iv) said third tube squeezing means being associated with said tube means intermediate said first and second tube squeezing means, being movable toward and away from squeezing relation of said tube means, and when moving toward said tube means being operable to displacingly force work material from said tube means, and (iv) fourth tube squeezing means operable in coordination with said second tube squeezing means to compensate for displacement of work material through said tube means when said second tube squeezing means moves between its open and closed positions, whereby the volume of material in said tube means that is displaced from said tube means will be primarily controlled by movement of said third tube squeezing means.