Fluid dispense pump with drip prevention mechanism and method for controlling same
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01F-011/20
G01F-011/00
출원번호
US-0534703
(2012-06-27)
등록번호
US-8701946
(2014-04-22)
발명자
/ 주소
Fugere, Jeffrey P.
출원인 / 주소
DL Technology, LLC
대리인 / 주소
Onello & Mello, LLP
인용정보
피인용 횟수 :
3인용 특허 :
137
초록▼
A material dispensing pump includes a drip prevention system and method so as to avoid undesired dripping of the dispensed fluid. In one example, the fluid path is sealed. Positive pressure is applied to the fluid during a dispensing operation to present the fluid to the auger-style pump at a desire
A material dispensing pump includes a drip prevention system and method so as to avoid undesired dripping of the dispensed fluid. In one example, the fluid path is sealed. Positive pressure is applied to the fluid during a dispensing operation to present the fluid to the auger-style pump at a desired rate. Between dispensing operations, or when dispensing is completed, the fluid is placed in suspension, for example by applying a negative pressure, thereby preventing the fluid from being inadvertently released at the dispense tip. In addition, following a dispensing operation, the pump dispensing controller can be programmed to reverse the rotation of the feed screw, in order to draw the material in a reverse direction and to further suspend the fluid.
대표청구항▼
1. A material dispensing pump comprising: a closed-loop servo-motor having indexed rotational positions;a dispensing controller that generates control signals to control the servo-motor, wherein the servo-motor performs a dispensing operation in response to the control signals;a housing having an op
1. A material dispensing pump comprising: a closed-loop servo-motor having indexed rotational positions;a dispensing controller that generates control signals to control the servo-motor, wherein the servo-motor performs a dispensing operation in response to the control signals;a housing having an opening;a removable cartridge assembly positioned in the opening, the cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity, and a feed mechanism extending through the cavity, the feed mechanism including a cylindrical neck and a feed path, the feed path being substantially sealed from ambient air between the inlet port and the outlet port by a seal positioned about the neck between the neck and the cartridge assembly and a threaded spanner nut that applies pressure in a direction along a longitudinal axis of the neck and that retains the seal in position about the neck, wherein the seal substantially seals the feed path from ambient air, the closed-loop servo-motor driving the feed mechanism during the dispensing operation;a pressure unit for applying positive pressure to cause material to be presented to the inlet port at a desired rate during the dispensing operation such that the material flows through the feed path toward the outlet port; anda material suspension unit for placing the material in the substantially sealed feed path in suspension following the dispensing operation. 2. The material dispensing pump of claim 1, wherein the control signals control at least one of the rotational position, the angular velocity, and the angular acceleration of the servo-motor during the dispensing operation. 3. The material dispensing pump of claim 1 further comprising a Position controller that controls the position of the pump relative to a substrate. 4. The material dispensing pump of claim 3, wherein the position controller operates in conjunction with the dispensing controller, wherein when the position controller generates a time-based signal to the dispensing controller, the dispensing controller initiates the dispensing operation in response to the time-based signal by generating a control signal to control the feed mechanism based on the indexed rotational positions. 5. The material dispensing pump of claim 1 further comprising a material reservoir in communication with the inlet port, the material reservoir containing the material to be dispensed during the dispensing operation. 6. The material dispensing pump of claim 5 further comprising a feed tube coupled between the material reservoir and the inlet port. 7. The material dispensing pump of claim 6 wherein the feed tube comprises an elastically compressible material and wherein the material suspension unit comprises means for constricting the feed tube to place the material in suspension. 8. The material dispensing pump of claim 7, wherein the material reservoir comprises a syringe and wherein the positive pressure is applied to the material in the syringe. 9. The material dispensing pump of claim 8, wherein the material suspension unit applies a negative pressure to the material following the dispensing operation to place the material in the substantially sealed feed path in suspension. 10. The material dispensing pump of claim 9, wherein the negative pressure comprises a vacuum provided by the pressure unit and drawn on the material in the syringe. 11. The material dispensing pump of claim 1, wherein the material suspension unit places the material in the substantially sealed feed path in suspension by applying a negative pressure to the material. 12. A method for dispensing material comprising: prior to a dispensing operation of material to be dispensed: positioning a removable cartridge assembly positioned in an opening of a housing of a material dispensing pump, the cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity, and a feed mechanism extending through the cavity, the feed mechanism including a cylindrical neck and a feed path, the feed mechanism positioned such that the feed path is substantially sealed from ambient air by positioning a seal about the neck between the neck and the cartridge assembly and providing a threaded spanner nut that applies pressure in a direction along a longitudinal axis of the feed mechanism and that positions the seal about the neck, wherein the seal substantially the feed path from ambient air;during a dispensing operation of material to be dispensed: driving the feed mechanism with a closed-loop servo-motor having indexed rotational positions; andapplying positive pressure to the material to cause material to be presented to the feed path at a desired rate; andfollowing the dispensing operation, placing the material in the substantially sealed feed path in suspension. 13. The method of claim 12, wherein the material in the substantially sealed feed path is placed in suspension by applying negative pressure to the material. 14. The method of claim 12 further comprising controlling the position of the pump relative to a substrate during the dispensing operation, wherein controlling the position of the pump is synchronized with controlling a rotational position, an angular velocity, and an angular acceleration of the servo-motor. 15. The method of claim 12 further comprising providing the material from a material reservoir in communication with the feed path. 16. The method of claim 15 further comprising coupling an elastically compressible feed tube between the material reservoir and the feed path, and constricting the feed tube to suspend the flow of material. 17. The method of claim 12 further comprising controlling a rotational position, an angular velocity, and an angular acceleration of the servo-motor during the dispensing operation.
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이 특허에 인용된 특허 (137)
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