Application device for applying adhesive, and adhesive application method

Patent metadata

Field	Value
Publication number	US-11998943-B2
Application number	US-202117200712-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 16, 2020
Publication date	Jun 4, 2024
Grant date	Jun 4, 2024

Abstract

An application method of an application device configured to apply an adhesive to an object. The method includes applying, prior to applying the adhesive to a specified part of the object, the adhesive to a part different from the specified part, calculating an application quantity of the adhesive applied to the part different from the specified part, making a first correction configured to correct an application condition of the adhesive based on a result of the calculation, and applying the adhesive to the specified part using the application condition corrected in the first correction.

First claim

What is claimed is:

1. An application device configured to apply an adhesive to an object, the application device comprising:
a dispenser configured to selectively discharge the adhesive toward a specified part of the object and toward a second part of the object different from the specified part; and
a control device comprising at least one processor and a memory, the control device controlling an application pressure used by the dispenser to discharge the adhesive,
wherein the at least one processor, under control of a program stored in the memory, is configured to:
control the dispenser, prior to applying the adhesive to the specified part of the object, to apply the adhesive to the second part of the object;
calculate an application quantity of the adhesive applied to the second part of the object;
determine whether the application quantity is within a specified range;
in response to determining that the application quantity is not within the specified range, determine whether the application quantity is within a correction-enabled range;
in response to determining that the application quantity is within the correction-enabled range at a first timing, determine a necessary correction amount by which to correct the application pressure, the necessary correction amount being determined based on (i) a necessary correction amount at a second timing at which the application quantity is determined to be within the correction-enabled range, and (ii) an interval between the first timing and the second timing, the second timing being prior to the first timing;
correct the application pressure at the first timing, based on the necessary correction amount; and
control the dispenser to apply the adhesive to the specified part of the object using the application pressure corrected in the first correction based on the necessary correction amount, in a case in which the application quantity is determined to be within the specified range,

wherein the necessary correction amount at the first timing is greater than the necessary correction amount at the second timing when the correction interval is less than a specified time.

2. The application device of claim 1 , further comprising:
a camera configured to image the adhesive applied to the part different from the specified part,
wherein the at least one processor is configured to calculate the application quantity of the adhesive based on an image acquired by imaging performed by the camera.

3. The application device of claim 1 , wherein:
the specified range includes a first threshold value, and a second threshold value greater than the first threshold value,
the correction-enabled range includes a third threshold value less than the first threshold value, and a fourth threshold value greater than both the second threshold value and the third threshold value, and
when the correction interval is less than the specified time, the application quantity is greater than or equal to the third threshold value and less than or equal to the first threshold value, and the change to the application pressure made in the second correction corresponds to an increase of a first amount, the at least one processor sets the change to the application pressure made in the first correction to increase by a second amount larger than the first amount.

4. The application device of claim 1 , wherein:
the application device is an application device for manufacturing a disk drive suspension,
the object comprises a flexure included in the disk drive suspension, and a frame to which a plurality of flexures including the flexure are fixed, and
the part different from the specified part is a part of the frame.

5. The application device of claim 2 , wherein the at least one processor is configured to calculate the application quantity based on an area and a height of the adhesive, the area and the height of the adhesive being obtained from the image of the adhesive acquired by the imaging performed by the camera.

6. The device according to claim 2 , wherein:
the camera comprises a plurality of cameras which image the adhesive applied to the second part from respective different angles, and
the at least one processor is configured to subject images acquired by the plurality of cameras from the respective different angles to image processing, and to calculate the application quantity of the adhesive based on the images having been subject to the image processing.

7. The device of claim 6 , wherein the image processing comprises at least one of noise removal and brightness correction.

8. The device of claim 1 , wherein:
the dispenser comprises a discharge drive mechanism operably coupled to a syringe having a nozzle from which the adhesive is discharged,
the discharge drive mechanism is configured to regulate a pressure of compressed air supplied to the syringe under control of the control device, and
the control device adjusts the application quantity by controlling regulation of the compressed air supplied to the syringe by the discharge drive mechanism.

Assignees

• Nhk Spring Co Ltd

Inventors

• Homma Akira

Classifications

• B05C11/1005 Primary

  responsive to condition of liquid or other fluent material already applied to the surface, e.g. coating thickness, weight or pattern · CPC title

• B05C5/0212 Primary

  only at particular parts of the articles (at particular part of web, band, strip, belt or ribbon B05C5/025) · CPC title

• B05C11/1013

  responsive to flow or pressure of liquid or other fluent material (B05C11/101 takes precedence; control of flow in general G05D7/00; control of fluid pressure in general G05D16/00) · CPC title

• B05D5/10

  to obtain an adhesive surface · CPC title

• B05C1/04

  for applying liquid or other fluent material to work of indefinite length {(B05C1/003 takes precedence)} · CPC title