Method and apparatus for detecting a liquid spray pattern

• US 7,188,781 B2
• Filed: 07/20/2004
• Issued: 03/13/2007
• Est. Priority Date: 01/22/2002
• Status: Active Grant

• Current Assignee: Nordson Corporation
• Original Assignee: Nordson Corporation
• Inventors: Donges, William E., Mycke, Jacques, Espenschied, Kenneth, Reighard, Michael A.
• Primary Examiner(s): HWU, DAVIS D
• Application Number:
  US10/894,489
• Publication Number:
  US 20050023367A1
• Time in Patent Office: 966 Days
• Field of Search: 239/67, 239/68, 239/69, 239/70, 239/71, 239/73, 239/1, 239/11, 239/451, 239/456, 239/458, 239/8, 427/8
• US Class Current: 239/71
• CPC Class Codes: B05B 1/04 in flat form, e.g. fan-like, sheet-like
• CPC Class Codes: B05B 12/004 comprising sensors for monitoring the delivery, e.g. by displaying the sensed value or generating an alarm B05B12/08 takes precedence; registering or indicating the condition or the working of machines or other apparatus in general G07C3/00
• CPC Class Codes: B05B 12/082 responsive to a condition of the discharged jet or spray, e.g. to jet shape, spray pattern or droplet size
• CPC Class Codes: B05B 15/50 Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
• CPC Class Codes: G01B 11/028 by measuring lateral position of a boundary of the object G01B11/022, G01B11/024, G01B11/04 take precedence
• CPC Class Codes: H05K 13/0069 Holders for printed circuit boards
• CPC Class Codes: H05K 13/0469 by applying a glue or viscous material
• CPC Class Codes: H05K 3/0091 Apparatus for coating printed circuits using liquid non-metallic coating compositions
• CPC Class Codes: H05K 3/1241 by ink-jet printing or drawing by dispensing

Abstract

During a liquid spray pattern detection procedure, the sensor (50, 52) is operable to detect the presence or absence of an edge of the dispensed liquid spray pattern. The nozzle (18) of the liquid dispensing system is moved to a predetermined position (A) relative to the sensor (50, 52) to determine the presence or absence of the spray pattern and is then moved to a second predetermined position (B) relative to the sensor (50, 52) to again determine the presence or absence of the spray pattern. Based on these determinations, the width of the spray pattern can be verified. This provides a quick means to verify that the width of the dispensed pattern is within certain tolerances.

Claims

1. A method of detecting a pattern of dispensed liquid material comprising the steps of:

dispensing the liquid material in a pattern from a liquid dispenser at a first position located to a side of a sensor;

detecting the presence or absence of the pattern with the sensor;

moving the dispenser relative to the sensor to a second position, the second position being to the same side of the sensor as the first position;

detecting the presence or absence of the pattern with the sensor;

and in response to detection at the first and second positions determining the status of the pattern of dispensed liquid material.

2. A method of detecting a pattern of a dispensed liquid material comprising the steps of:

a) transmitting a beam of light;

b) moving a dispenser relative to the beam of light to a first position located to a side of the beam of light and dispensing the liquid material in a pattern;

c) generating a signal in response to the presence or absence of the pattern in the beam of light;

d) moving the dispenser relative to the beam of light to a second position located to the same side of the beam of light as the first position, to dispense the liquid material in the pattern; and

e) generating a signal in response to the presence or absence of the pattern in the beam of light.

3. The method of claim 2 wherein the dispensing of the liquid material in a pattern includes the steps of:

dispensing the material in a fan like pattern having first and second edge regions and a center web section disposed between the first and second edge regions, each edge region having a width; and

wherein the step of moving the dispenser to a second position includes moving the dispenser a distance which is equal to or less than one half the width of one of the edge regions of the pattern.

4. The method of claim 3 wherein the liquid material is transparent.

5. The method of claim 3 further including the step of:

in response to the signals generated determining the status of the pattern.

6. The method of claim 2 wherein the beam of light is transmitted through a pair of spaced apart baffles and the dispensed pattern of liquid material is dispensed between the baffles.

7. The method of claim 6 wherein the dispensed liquid material is received by a base, having a “

W”

profile extending between the pair of baffles, the material passing through the base and is collected in a pan.

8. The apparatus for detecting a pattern of dispensed liquid material comprising:

a sensor including a transmitter and a receiver mounted in confronting spaced apart relationship to one another, the transmitter transmitting a beam of light and the receiver receiving the beam of light and generating signals in response to the presence or absence of the beam of light, wherein under normal operating conditions, the pattern of dispensed liquid material will pass through the beam of light; and

a baffle assembly including two spaced apart baffles attached to a base having a “

W”

shaped profile, the baffle assembly disposed between the transmitter and the receiver, and each baffle includes an aperture for allowing the beam of light to pass therethrough.

9. The apparatus of claim 8 further comprising a drain pan having an opening for receiving the dispensed liquid material;

and wherein the baffle assembly is disposed within the opening of the drain pan, the baffle assembly including an aperture for allowing the dispensed material to pass therethrough to the pan.

10. The apparatus of claim 9 further including a pair of mounting bracket assemblies for mounting the transmitter and receiver.

11. The apparatus of claim 10 wherein the sensor is a fiber optic sensor or laser.

12. The apparatus of claim 11 wherein the mounting bracket assembly comprises a housing having a slot therein and an aperture coupled to the slot;

a clamping assembly for releasably maintaining a fiber optic cable of the sensor within the slot while maintaining the alignment of the cable with the aperture,

a lens covering the aperture; and

a cover.