JPS6327068B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an adhesive applicator, and more particularly to an apparatus for applying an adhesive to a lens that is pasted with a jig.

Problems with the Prior Art Conventionally, as shown in FIG.
The air-driven type disclosed in Japanese Patent Application No. 56-196589, Japanese Patent Application No. 57-12717, or Japanese Patent Application No. 57-12718 is known.

This device applies a fixed amount of adhesive supplied by air upward to a lens 2 which is held in a predetermined position by a suction cylinder 1 with the application surface (applied surface) 2a facing downward. , a case 4 that accommodates the adhesive 3, and a band heater 5 wrapped around the case 4 to heat and melt the adhesive 3 in the case 4 to a predetermined viscosity.
, a cylindrical dispenser body 7 having a built-in flow restrictor and a piston (both not shown) to send the adhesive 3 fed from the case 4 via air to the application nozzle 6 via air, and a case. 4
The apparatus is composed of a control device 8 for controlling a band heater 5 and the like, and a hot air heater 9 arranged around the coating nozzle 6.

Therefore, in order to apply a certain amount of adhesive 3 to the coating surface 2a of the lens 2 using the above device, the semi-solid adhesive is first placed in the case 4, heated by the band heater 5, and bonded. Agent 3 is melted to a predetermined viscosity.

Then, air pressure controlled by the control device 8 is applied to the case 4 to feed the melted adhesive 3 into the dispenser body 7, and air pressure controlled by the control device 8 is also applied for a short time. Melted adhesive 3 added to dispenser body 7
is sent out to an upwardly curved coating nozzle 6.

The adhesive 3 sent to the application nozzle 6 and reaching its discharge port is cooled by the dispenser main body 7 etc. and has a high viscosity.
It is reheated, its viscosity decreases, and it swells due to its surface tension.

Finally, the application nozzle 6 is raised by a lift drive device (not shown), and the adhesive 3 swelled at its discharge port is applied to the application surface 2a of the lens 2, thereby completing the application of the adhesive 3 to the lens 2. . As is clear from the figure, during this application, lens 2
The outer diameter of the lens 2 is larger than the outer diameter of the coating nozzle 6, and therefore, the adhesive that has swelled up at the discharge port of the coating nozzle 6 is applied only to approximately the center of the coating surface 2a of the lens 2.

Note that even when a large amount of adhesive 3 is delivered to the coating nozzle 6, the adhesive 3 flows down from the discharge port of the coating nozzle 6, so that the lens 2 is not coated with more adhesive 3 than necessary.

However, when using the above device, there are problems described below.

(1) The structure and adjustment are complex and expensive.

(2) When bubbles are generated when the adhesive is heated and melted, and the adhesive containing the bubbles is forcibly fed to the dispenser body using air, so the adhesive does not come out from the discharge port of the application nozzle 6. This is a fatal flaw in automatic machines, so a defoaming device is required.

(3) The case, dispenser body, etc. are heated by the hot air heater around the application nozzle, so the control conditions change every moment.

(4) Excess adhesive overflows from the application nozzle and falls, staining the area around the device and wasting material.

OBJECTS OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an apparatus for applying a predetermined amount of a high-viscosity adhesive to the attachment surface of a lens.

Summary of the Invention In order to achieve the above object, the present invention immerses a coating shaft in an adhesive in a case that is melted to a constant viscosity by a heating source, and rotates or moves the coating shaft up and down by a moving mechanism. The adhesive is moved to a predetermined position on the case, and a certain amount of adhesive attached to the tip of the application shaft is applied to the lens.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing a first embodiment of the present invention. In the figure, 10 is the vertical case mounting wall 1.
0a and a mechanism mounting wall 10b extending horizontally to the upper end of the case mounting wall 10a. The open rectangular case 12 is covered with insulation material 1.
It is fixed with 3 interposed.

The case 12 houses the adhesive 14 that is heated and melted by the plate heater 11, and is made of a material with poor thermal conductivity, such as stainless steel. The plate heater 11 is turned on and off by a temperature regulator 16 having a temperature sensor 15 that detects the temperature of the adhesive 14.

On the other hand, on the mechanism mounting wall 10b of the frame 10,
A shaft 17 with one end brought above the case 12 and extending horizontally is rotatably mounted via a bearing housing 18. The shaft 17 constitutes a part of a moving mechanism that rotates a coating shaft described later from inside the adhesive 14 to a predetermined position on the case 12, and has a coating arm 19 at one end extending in a direction perpendicular to its longitudinal direction. One end of the holder is appropriately fixed with a heat insulating material (not shown) interposed therebetween. The applicator arm 19 has a length sufficient to allow the other end to be immersed in the adhesive 14. A lens 26 is attached to the other end of the applicator arm 19 so that a predetermined amount of adhesive 14 is attached to the tip.
An applicator shaft 20 having a tip portion with a smaller diameter than the outer diameter of
is attached so as to extend perpendicularly to the longitudinal direction of the shaft 17 and the applicator arm 19 and to be detachably attached thereto.

A lever 21 is fixed to the other end of the shaft 17, and the lever 21 has a direct-acting cylinder 22 which is operated by fluid pressure to rotate the shaft 17.
A piston rod 22a is connected via a joint 23 fixed to its tip. The cylinder body 22b of the direct-acting cylinder 22 is connected to the mechanism mounting wall 1 of the frame 10 via the clevis 24.
It is rotatably attached to 0b.

Next, the operation of the above embodiment will be explained.

First, the solid adhesive 14 is housed in the case 12, and power is supplied to the plate heater 11 to heat and melt the adhesive 14. Then, in order to maintain the adhesive 14 at a predetermined viscosity, the plate heater 11 is turned on and off while the temperature of the adhesive 14 is detected by a temperature sensor 15 inserted into the adhesive 14 using a temperature regulator 16. to maintain the adhesive 14 at a constant temperature.

Then, when the adhesive 14 reaches a predetermined viscosity, the direct-acting cylinder 22 is activated to rotate the shaft 17. As the shaft 17 rotates approximately 90 degrees clockwise in FIG. 2, the application shaft 20, which is immersed almost horizontally in the adhesive 14, is immersed in the adhesive 14 by a predetermined amount, as shown in FIG. The application shaft 20 is moved to a vertical position with the tip to which the adhesive 14 is attached facing upward.
The adhesive 14 at the tip is automatically applied to the center of the applied surface of the lens 26 held at the lower end of the suction tube 25 with the applied surface facing downward, and the application of the adhesive 14 to the lens 26 is completed.

Here, since the application shaft 20 applies the adhesive 14 upward, the adhesive 14 is applied to the area other than the end surface of the tip end.
flows down into the case 12. Therefore, a fixed amount of adhesive 14 depending on the viscosity is always attached to the tip of the application shaft 20.

Note that due to the difference in the diameter of the lens 26, the adhesive 14
However, in order to change the amount of application, that is, the amount of adhesive 14 attached to the tip of the application shaft 20, it is necessary to change the amount of adhesive 14 based on the change in the diameter of the tip of the application shaft 20 and the heating temperature. This is done by changing the viscosity of

FIG. 3 is a plan view showing a second embodiment of the present invention. In this embodiment, whereas the first embodiment described above uses a direct-acting cylinder 22 to rotate the shaft 17, Rotation drive device 2 that can freely rotate forward and reverse
The difference is that 7 is used. Other points are the same as those in the first embodiment, so the same members are given the same reference numerals and their explanations will be omitted.

That is, a driven gear 28 is appropriately fixed to the other end of the shaft 17, which is rotatably mounted on the mechanism mounting wall 10b of the frame 10 via the bearing housing 18. Further, the rotary drive device 27, such as an electric motor or a rotary cylinder, is fixed to the mechanism mounting wall 10b with its output shaft 27 parallel to the shaft 17, and a drive gear 29 is attached to the output shaft 27. It is properly fixed. The driving gear 29 and the driven gear 28 are in mesh with each other.

Therefore, by rotating the rotary drive device 27 in an appropriate direction, the application shaft 20 is rotated between the inside of the adhesive 14 and the application position on the lens, as in the first embodiment.

In each of the embodiments described above, a case has been described in which the upper surface of the case 12 is opened, but the application shaft 2 is not limited to this.
By providing a lid that does not interfere with zero, etc., thermal energy can be used effectively.

Effects of the invention As described above, according to the present invention, compared to the prior art,
Various effects described below are achieved.

(1) The amount of adhesive applied can be set arbitrarily by changing the cross-sectional area of the tip of the application shaft.

(2) By constantly immersing the application shaft in the adhesive, the viscosity of the adhesive during application can be kept constant, and thus the amount of application can always be kept constant.

(3) There is no possibility that the adhesive cannot be coated due to air bubbles mixed into the adhesive.

(4) The structure and adjustment are extremely simple and inexpensive.

(5) Unnecessary adhesive adhering to the applicator shaft falls into the case, so the area around the device is not contaminated and materials are not wasted.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a perspective view showing an enlarged main part thereof, FIG. 3 is a plan view showing a second embodiment of the present invention, and FIG. 4 is a schematic configuration diagram of a conventional technique. 10...Frame, 11...Plate heater, 1
2... Case, 14... Adhesive, 17... Shaft, 20... Application shaft, 22... Direct acting cylinder, 25... Adsorption tube, 2
6... Lens, 27... Rotation drive device.

Claims (1)

[Claims] 1. A device comprising: a case containing an adhesive whose viscosity changes depending on temperature; a heating source for melting the adhesive in the case to a predetermined viscosity; and a horizontal axis extending above the case. , a drive mechanism for rotating the shaft within a predetermined angle, a coating arm attached to the shaft so as to extend in a direction perpendicular to the longitudinal direction of the shaft, and a coating arm extending perpendicular to the longitudinal direction of the shaft and the coating arm. The coating shaft is attached to the end of the coating arm so as to force the adhesive to be applied, and has a tip having a smaller diameter than the outer diameter of the object to be coated, and the drive mechanism rotates the horizontal shaft to apply the adhesive. The molten adhesive is stirred by the shaft and the application arm, and the adhesive attached to the tip of the application shaft is applied to approximately the center of the surface of the object to be coated, which is located above the adhesive surface. Adhesive applicator with special features.