IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0817703
(2015-08-04)
|
등록번호 |
US-9833808
(2017-12-05)
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발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 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 removable cartridge
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 removable cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity;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, 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 securing device that secures the seal in position about the neck;a material suspension unit for placing the material in the substantially sealed feed path in suspension in response to the control signals generated by the dispensing controller, wherein the control signals control at least one of a rotational position, an angular velocity, or an angular acceleration of the servo-motor. 2. The material dispensing pump of claim 1 further comprising a pressure unit for applying positive pressure to cause material to be presented to the inlet port at a desired rate such that the material flows through the feed path toward the outlet port. 3. The material dispensing pump of claim 2, wherein the servo-motor drives the feed mechanism in at least one of a first direction of rotation during the dispensing operation or a second direction of rotation opposite the first direction of rotation at which the material in the feed path to be presented to the inlet port is placed in suspension. 4. The material dispensing pump of claim 3, wherein the material suspension unit places the material in the substantially sealed feed path in suspension following the dispensing operation. 5. The material dispensing pump of claim 1 further comprising a position controller that controls the position of the pump relative to a substrate. 6. The material dispensing pump of claim 5, 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. 7. 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. 8. The material dispensing pump of claim 7 further comprising a feed tube coupled between the material reservoir and the inlet port. 9. The material dispensing pump of claim 8 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. 10. The material dispensing pump of claim 7, wherein the material reservoir comprises a syringe and wherein positive pressure is applied to material in the syringe. 11. The material dispensing pump of claim 10, 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. 12. The material dispensing pump of claim 11, wherein the negative pressure comprises a vacuum provided by the pressure unit and drawn on the material in the syringe. 13. The material dispensing pump of claim 11, wherein the negative pressure comprises a vacuum drawn on the material in the syringe. 14. The material dispensing pump of claim 1, further comprising a housing having an opening, wherein the cartridge assembly is positioned in the opening. 15. 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 openinga fixed-z type cartridge assembly constructed and arranged to receive a fixed-z type dispensing needle, the fixed-z type cartridge assembly positioned in the opening, the fixed-z type cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity, and a pin capture that secures the cartridge assembly to the housing and for preventing a longitudinal travel of the cartridge relative to the housing;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, 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 securing device that secures the seal in position about the neck; anda material suspension unit for placing the material in the substantially sealed feed path in suspension. 16. The material dispensing pump of claim 15, further comprising an actuator pin that extends into the housing and engages the pin capture. 17. 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 openinga floating-z type cartridge assembly constructed and arranged to receive a floating-z type dispensing needle, the floating-z type cartridge assembly positioned in the opening, the floating-z type cartridge assembly having a cavity, an inlet port, an outlet port in communication with the cavity, and a pin capture having an elongated groove that allows a longitudinal travel of the cartridge relative to the housing;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, 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 securing device that secures the seal in position about the neck; anda material suspension unit for placing the material in the substantially sealed feed path in suspension. 18. The material dispensing pump of claim 17, further comprising an actuator pin that extends into the housing and engages the elongated groove of the pin capture. 19. The material dispensing pump of claim 17, wherein the cartridge assembly comprises a locator at the outlet port for registering with the floating-z type dispensing needle.
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