JP2012201054A - Adhesive applying apparatus for plastic lens mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive applying apparatus capable of easily controlling the applying amount of an adhesive while suppressing production cost low, and capable of simply applying a curved attaching piece with the adhesive.SOLUTION: The adhesive applying apparatus includes a support part for supporting an injection auxiliary member 2, and an applying part 4 for applying the adhesive to the curved attaching piece 12 of the injection auxiliary member 2. The applying part 4 includes a plurality of coating nozzles 21 composed of the pipes facing the attaching piece 12, an adhesive supply device 22 for supplying the adhesive to the application nozzles 21, and a drive device for changing the intervals between the attaching piece 12 and the coating nozzles 21. The intervals between the tips of the respective application nozzles 21 and an adhesion surface 12a are equally formed in all of the application nozzles 21.

Description

  The present invention relates to an adhesive applicator for a plastic lens mold for applying an adhesive to an injection assisting member that is bonded to a mold for molding a plastic lens.

  Conventional plastic lenses for spectacles are generally formed by cast polymerization. This casting polymerization is a method in which a plastic lens material is injected into a mold and cured by heat or energy such as ultraviolet rays to obtain a molded product. A mold used for cast polymerization is described in Patent Document 1, for example.

  The mold disclosed in Patent Document 1 includes a mold assembly in which a lens molding cavity is formed, and an injection assisting member bonded to the mold assembly. The mold assembly is composed of a pair of disk-shaped mold members that are molds for lens surface molding, and a tape that is wound around the outer periphery of these mold members so as to be a mold for edge surface molding. Yes. The tape has an injection port for injecting a plastic lens material.

  The injection assisting member is for guiding a plastic lens material into the cavity. The injection assisting member includes a cylinder for inserting a nozzle for supplying a plastic lens material, and a plate-like attachment piece integrally formed at one end of the cylinder. The mounting piece is formed in a shape along the outer peripheral surface of the mold assembly. The mounting piece is formed with an opening that communicates the inside and outside of the cylindrical body. The mounting piece is bonded to the outer peripheral surface of the mold assembly with an adhesive tape or an adhesive.

  The opening formed in the mounting piece is positioned at a position facing the inlet of the tape. The nozzle is inserted from an injection assisting member into the injection port of the tape and injects a plastic lens material into the cavity.

  In order to bond the injection assisting member to the mold assembly, an operator first attaches an adhesive tape to the mounting piece of the injection assisting member or applies an adhesive. The adhesive tape has a through hole at a position facing the opening of the mounting piece. The operator holds the injection holding member to which the adhesive tape has been applied or the adhesive has been applied in this way, and presses it against the outer peripheral surface of the mold assembly, whereby the injection auxiliary member is bonded to the mold assembly. The

International Publication WO 2010/098466

  The inventor is considering automating the process of supplying the adhesive using an adhesive application device that applies a liquid adhesive to the mounting piece of the injection assisting member described above. However, it has been found that the adhesive application device capable of realizing this has two problems described later.

  The first problem is that it is necessary to adopt a configuration capable of accurately controlling the amount of adhesive applied. When the application amount of the adhesive is small, the injection assisting member cannot be correctly bonded to the mold assembly. On the other hand, when the application amount of the adhesive is large, the adhesive may overflow and flow into the injection assisting member from the opening of the mounting piece. If the adhesive enters the inside of the opening, the adhesive may enter the cavity together with the plastic lens material when the plastic lens material is injected from the injection assisting member into the cavity of the mold assembly. Thus, the plastic lens mixed with the adhesive becomes a defective product.

  The second problem is that the mounting piece of the injection assisting member is curved so as to follow the outer peripheral surface of the mold assembly. That is, in order to apply the adhesive onto the curved surface by moving the application nozzle, the mechanism for moving the application nozzle becomes complicated.

  The present invention has been made to solve such problems, and can control the amount of adhesive applied while keeping the manufacturing cost low, and can easily apply the adhesive to a curved mounting piece. It is an object of the present invention to provide an adhesive application device.

  In order to achieve this object, an adhesive coating apparatus for a plastic lens mold according to the present invention has a mounting piece bonded to a peripheral wall of a hollow cylindrical mold that molds a plastic lens, and is attached to the peripheral wall. A support portion for supporting an injection assisting member in which a hole for supplying a lens material communicating with the opening to be opened is formed; and an application portion for applying an adhesive to a mounting piece of the injection assisting member supported by the support portion; The attachment surface of the mounting piece is formed in a shape along the outer peripheral surface of the peripheral wall, and the application portion is bonded to the application nozzle and a plurality of application nozzles composed of pipes facing the attachment piece. An adhesive supply device for supplying an agent, and a drive device for changing the distance between the application nozzle and the mounting piece, and the distance between the tip of each application nozzle and the adhesive surface is uniform for all the application nozzles. In It is those that have been made.

  According to the present invention, in the above invention, the adhesive supply device includes a holder that supports all the application nozzles, and the holder is connected to each application nozzle and supplied with an adhesive from an adhesive supply source. The adhesive storage chamber is formed, and the volume of the adhesive storage chamber is formed so that the adhesive is distributed to all the application nozzles.

  In the present invention according to the present invention, the coating nozzle is disposed so as to surround the hole of the mounting piece.

According to the present invention, since the supply amount of the adhesive corresponds to the volume of the adhesive discharged from the application nozzle made of a pipe, it can be easily measured.
Further, since the adhesive can be applied in a so-called stamp type by changing the interval between the mounting piece and the plurality of application nozzles, it can be realized with a simple mechanism.
Therefore, according to the present invention, there is provided an adhesive applicator for a plastic lens mold that can control the amount of adhesive applied while keeping the manufacturing cost low and can easily apply the adhesive to a curved mounting piece. be able to.

It is a side view which shows schematic structure of the adhesive agent coating apparatus for plastic lens molds which concerns on this invention. It is a disassembled perspective view of the shaping | molding die for plastic lenses. FIG. 4A is a cross-sectional view of a plastic lens mold, in which FIG. 1A is a longitudinal cross-sectional view showing the entire mold cut away, and FIG. 2B is an enlarged cross-sectional view of the main part. It is a front view which shows the specific structure of an adhesive agent coating apparatus. It is a side view which shows the specific structure of an adhesive agent coating apparatus. It is a top view which shows the specific structure of an adhesive agent coating apparatus. It is a bottom view of an application nozzle and a holder. It is the VIII-VIII sectional view taken on the line in FIG. It is the IX-IX sectional view taken on the line in FIG. The side view of the principal part for demonstrating the apply | coating method, The figure (A) shows the state which hold | maintained the droplet of the adhesive agent by the application nozzle, The figure (B) attaches an adhesive agent to an attachment piece. FIG. 3C shows a state where the coating nozzle is raised by a predetermined distance. It is a flowchart for demonstrating the application | coating method.

  Hereinafter, an embodiment of an adhesive applicator for a plastic lens mold according to the present invention will be described in detail with reference to FIGS. First, a schematic configuration of an adhesive application device according to the present invention will be described with reference to FIG.

An adhesive application device 11 shown in FIG. 1 includes a support portion 3 that supports an injection assisting member 2 that is a member to which an adhesive (not shown) is applied, and an application portion 4 that applies an adhesive to the injection assisting member 2. And.
The injection assisting member 2 constitutes a part of the plastic lens mold 5 as shown in FIGS. The plastic lens mold 5 is for molding a plastic lens. As shown in FIGS. 2 and 3A, the plastic lens mold 5 according to this embodiment includes a mold assembly 6 having a hollow cylindrical shape, and the above-described adhesive bonded to the outer peripheral surface of the mold assembly 6. The injection assisting member 2 is used.

The mold assembly 6 includes a pair of disk-shaped mold members (a first mold member 7 and a second mold member 8) and a tape 98 wound around the outer peripheral surfaces of the mold members 7 and 8. It is configured.
In the mold assembly 6, the injection assisting member 2 is bonded after the injection port 10 is formed in the tape 9.

The mold members 7 and 8 are formed in a predetermined shape by a glass material that can transmit light, and constitute a mold for forming a lens surface. In FIG. 3, the lower surface 7a of the first mold member 7 located on the upper side is a concave curved surface that is convex upward, and the upper surface 8a of the other second mold member 8 is convex upward. It is a convex curved surface.
The tape 9 constitutes a mold for forming the edge surface of the lens. The tape 9 is a so-called adhesive tape formed of a material that can transmit light. The tape 9 is wound and pasted around the outer peripheral surfaces of the first and second mold members 7 and 8 at least once. That is, the peripheral wall of the plastic lens mold 5 is constituted by the tape 9.

  The tape 9 covers the entire outer peripheral surface of the first and second mold members 7 and 8. The tape 9 is wound around the first and second mold members 7 and 8 so as not to protrude from the non-use surface of the second mold member 8. The non-use surface is a concave surface opposite to the upper surface 8a in the second mold member 8. The width of the tape 7 can be changed as long as it is a width that seals the gap between the first and second mold members 7 and 8.

  Although not shown, the tape 9 includes a belt-like base material and an adhesive layer formed on one surface of the base material (a surface facing the mold members 7 and 8). Examples of the base material include polyester. The material forming the adhesive layer is preferably one that does not dissolve into the plastic lens material or inhibit the polymerization, and examples thereof include a silicone-based adhesive.

By winding the tape 9 around the pair of mold members 7 and 8, the mold assembly 6 having the lens forming cavity 11 (see FIG. 3) is assembled.
The inlet 10 formed in the tape 9 is for injecting a plastic lens material into the cavity 11. The injection port 10 is formed by, for example, a cutter (not shown) on the tape 9 wound around the first and second mold members 7 and 8.

  As shown in FIGS. 2 and 3, the injection assisting member 2 is formed integrally with a mounting piece 12 formed in a shape that can be overlapped with the outer peripheral portion of the mold assembly 6, and the mounting piece 12. And the auxiliary member main body 13. The injection assisting member 2 is made of a plastic material. The mounting piece 12 is formed in a plate shape curved with a curvature along the outer peripheral surface of the mold assembly 6. In the assembled state shown in FIG. 3, the mounting piece 12 is bonded to the mold assembly 6 with an adhesive 14.

  The auxiliary member main body 13 is a cylinder having a quadrangular cross section, and is formed so as to extend from the mounting piece 12 to the side opposite to the mold assembly 6. As shown in FIG. 3, the auxiliary member main body 13 according to this embodiment includes a flat plate portion 13a extending in parallel with the radial direction of the mold assembly 6, and an inclined portion 13b facing the flat plate portion 13a. . The inclined portion 13b is inclined so as to gradually approach the flat plate portion 13a toward the mounting piece 12. A flange 15 is provided at the end of the auxiliary member body 13 opposite to the mounting piece 12.

The inside of the auxiliary member main body 13 becomes a passage 16 through which a molten plastic lens material (not shown) flows. The attachment piece 12 is formed with a slit-like hole 17 (see FIG. 3) serving as an opening at one end of the passage 16. The hole 17 is formed to extend in parallel with the flat plate portion 13a when the mounting piece 12 is viewed from the mold assembly 6 side. In this embodiment, the hole 17 constitutes a “lens material supply hole” in the present invention.
After the injection port 10 is formed in the tape 9, the injection assisting member 2 is bonded to the mold assembly 6 with the hole 17 facing the injection port 10.

  As shown in FIG. 1, the support portion 3 of the adhesive application device 1 is configured to support the injection assisting member 2 with the mounting piece 12 exposed. The support part 3 shown in FIG. 1 supports the attachment piece 12 in a state where the adhesive surface 12a of the attachment piece 12 is directed upward. In addition, although the support part 3 is not shown in figure, the structure which supports the injection | pouring auxiliary member 2 so that the said adhesive surface 12a may face a horizontal direction or the downward direction can be taken.

The application unit 4 of the adhesive application device 1 includes a plurality of application nozzles 21 facing the mounting piece 12, an adhesive supply device 22, and a drive device 23.
Each application nozzle 21 is formed of a pipe. The application nozzle 21 shown in FIG. 1 is positioned above the mounting piece 12 so as to extend in the vertical direction. The lower end of the application nozzle 21 is opened downward. The distance D between the tip (lower end) of each application nozzle 21 and the adhesive surface 12a (the upper surface in FIG. 1) of the mounting piece 12 is formed uniformly in all the application nozzles 21.

  The adhesive supply device 22 supplies the liquid adhesive 14 to the application nozzle 21. Further, as shown in FIG. 10, the adhesive supply device 22 is configured to maintain a state where the adhesive 14 is held as a droplet 14 a at the tip of the application nozzle 21. The adhesive 14 used in this embodiment is of an ultraviolet curable type and has a predetermined viscosity. The adhesive 14 is not limited to the ultraviolet curable type, and can be changed as appropriate.

  The driving device 23 is configured to be able to change the interval between the coating nozzle 21 and the mounting piece 12. The drive device 23 shown in FIG. 1 is configured to move the application nozzle 21 up and down. The droplet 14a of the adhesive 14 held at the tip of the application nozzle 21 by the adhesive supply device 22 adheres to the adhesive surface 12a of the mounting piece 12 when the application nozzle 21 descends from the initial position shown in FIG. To do. In addition, the drive device 23 when the bonding surface 12a of the mounting piece 12 is oriented in the horizontal direction is configured such that the application nozzle 21 moves in the horizontal direction. Further, the driving device 23 in the case where the mounting piece 12 is directed downward is configured such that the application nozzle 21 rises toward the mounting piece 12 when the adhesive is applied.

In the adhesive application device 1 shown in FIG. 1, the application nozzle 21 descends in a state in which the droplet 14 of the adhesive 14 is formed at the tip of the application nozzle 21, thereby bonding to the attachment piece 12 of the injection assisting member 2. Agent 14 is applied. For this reason, the supply amount of the adhesive 14 can be a constant amount equal to the volume of the droplet 14 a formed at the tip of the application nozzle 21.
Further, the application of the adhesive 14 can be performed in a so-called stamp type by changing the interval between the mounting piece 12 and the plurality of application nozzles 21, and thus can be realized by a simple mechanism such as an elevating mechanism.
Therefore, according to this embodiment, the amount of the adhesive 14 applied can be controlled without providing a complicated mechanism in the apparatus itself, and the plastic lens can be easily applied to the curved mounting piece 12. A mold adhesive applicator can be provided.

Next, a specific configuration of the adhesive application device 1 will be described in detail with reference to FIGS. In these drawings, members that are the same as or equivalent to those described with reference to FIG. 1 are given the same reference numerals, and detailed descriptions thereof are omitted as appropriate.
The adhesive application device 1 shown in FIGS. 4 to 6 includes a support portion 3 and an application portion 4 provided on one base 31.

The support portion 3 is configured to hold the injection assisting member 2 in the horizontal direction. The support portion 3 includes a support stage 32 that supports the injection assisting member 2 and a holding device 33 that holds the injection assisting member 2 in cooperation with the support stage 32.
A concave groove 34 (see FIG. 6) that opens upward is formed on the upper surface of the support stage 32. The concave groove 34 is formed in a shape in which the flange 15 of the injection assisting member 2 is movably fitted. The injection assisting member 2 is loaded on the support stage 32 in a state where the flange 15 is fitted into the concave groove 34 by an operator or an automatic loading device (not shown).

An elongated hole 35 (see FIGS. 4 and 6) is formed in the bottom of the concave groove 34 so as to penetrate the support stage 32 and the base 31 in the vertical direction. A pin-shaped pressing member 36 is inserted into the long hole 35 from below.
The pressing member 36 is for pressing the injection assisting member 2 placed on the concave groove 34 and moving it horizontally. A stopper 32 a for sandwiching the injection assisting member 2 in cooperation with the pressing member 36 is provided at one end of the support stage 32.

  As shown in FIGS. 4 and 5, the pressing member 36 is supported by a cylinder device 37 below the base 31 so as to penetrate the base 31 and the support stage 32 in the vertical direction. The cylinder device 37 is configured to reciprocate the pressing member 36 between a holding position indicated by a solid line in FIG. 4 and a standby position indicated by a two-dot chain line in FIG. The cylinder device 37 and the pressing member 36 constitute the holding device 33 described above.

  The injection assisting member 2 loaded on the support stage 32 is held between the stopper 32a and the pressing member 36 as the pressing member 36 moves to the holding position. In this manner, in the state where the injection assisting member 2 is held on the support stage 32, the adhesive surface 12a of the mounting piece 12 is directed upward.

  The application unit 4 according to this embodiment has a horizontal movement device 41 (see FIGS. 5 and 6) so that the application nozzle 21 can be moved from the upper side of the mounting piece 12 to the side after the adhesive 14 is applied. It is provided on the top. The reason for moving the application nozzle 21 to the side after applying the adhesive is that when the injection assisting member 2 is taken out of the support stage 32, the injection assisting member transfer device (not shown) or the injection assisting member 2 is lifted. This is to prevent the operator's arm from coming into contact with the application nozzle 21.

  As shown in FIG. 5, the horizontal moving device 41 is configured with an air cylinder 42 arranged in the horizontal direction as a power source. The horizontal movement device 41 reciprocates the driving device 23 of the coating unit 4 between a standby position indicated by a solid line in FIG. 5 and a retracted position indicated by a two-dot chain line A in FIG. In a state where the driving device 23 is located at the standby position, a coating nozzle 21 described later faces the mounting piece 12. Further, in a state where the driving device 23 is located at the retracted position, the application nozzle 21 is separated from the upper side of the mounting piece 12 to the side.

  As shown in FIG. 5, the driving device 23 includes a motor 43 as a power source, and changes the rotation of the motor 43 into a reciprocating motion to raise and lower the driving member 44. The drive member 44 supports an adhesive supply device 22 and a coating nozzle 21 described later via a support stay 45.

The operation of the driving device 23 is controlled by a control device (not shown). This control device controls the operations of the cylinder device 37, the horizontal movement device 41, and the adhesive supply device 22 described later so that the adhesive 14 is automatically applied to the injection assisting member 2.
The drive device 23 lowers the application nozzle 21 and the adhesive supply device 22 to the application position indicated by the solid line in FIG. 5 when applying the adhesive 14 under the control of the control device.

  Further, the drive device 23 will be described in detail later, but the application nozzle 21 and the adhesive supply device 22 are divided into two portions after application of the adhesive 14 by the control of the control device by a two-dot chain line B in FIG. Raise to the indicated standby position. As the application nozzle 21 rises to the standby position, a wide gap is formed between the application nozzle 21 and the mounting piece 12. In this state, even if the drive device 23 moves in the horizontal direction between the standby position and the retracted position by driving by the horizontal movement device 41, the application nozzle 21 does not contact the mounting piece 12.

  As shown in FIGS. 4 and 5, the adhesive supply device 22 according to this embodiment includes a housing 51 fixed to the support stay 45, a valve 52 provided inside the housing 51, and a housing 51. And a pipe 53 extending downward from the lower end portion of the. A hose 54 for replenishing the adhesive 14 into the housing 51 is connected to the upper end of the housing 51. As the hose 54, a flexible hose is used so as not to hinder the lifting and lowering operation of the housing 51. The end of the hose 54 opposite to the housing 51 is connected to an adhesive tank (not shown). The adhesive is extruded from the adhesive tank into the hose 54 by air pressure, and is supplied into the housing 51 through the hose 54.

  An adhesive passage 55 is formed in the housing 51. The adhesive passage 55 connects the hose 54 and the pipe 53, and extends through the pipe 53 to the coating nozzle 21 described later. In this embodiment, the housing 51 constitutes an “adhesive supply source” in the present invention.

  The valve 52 opens and closes an intermediate portion of the adhesive passage 55. Although not shown in detail, the valve 52 can be constituted by, for example, a spool valve driven by a solenoid. The adhesive passage 55 is formed so that the adhesive 14 cannot flow when the valve 52 is closed. In the state where the valve 52 is closed, the pressure in the adhesive passage 55 upstream of the valve 52 increases. When the valve 52 is open, the adhesive 14 is supplied from the inside of the housing 51 to the application nozzle 21 through the adhesive passage 55.

  When the adhesive passage 55 including the lower end of the application nozzle 21 is filled with the adhesive 14, the adhesive 14 flows out from the application nozzle 21 when the valve 52 is opened. The valve 52 according to this embodiment is configured to close after opening for a predetermined supply time. The supply time is set to a time from when the adhesive 14 flows out from the tip of the coating nozzle 21 until it accumulates as a droplet 14 a at the tip of the coating nozzle 21. When the valve 52 is opened for the supply time and then closed, a droplet 14a of the adhesive 14 is formed in a substantially spherical shape at the tip of the application nozzle 21 by surface tension, as shown in FIG.

The application nozzle 21 according to this embodiment is supported by a single holder 56 as shown in FIGS. The number of the application nozzles 21 is not particularly limited, and FIGS. 7 to 9 are merely examples. The holder 56 includes a box-shaped main body 57 that opens upward, and a lid body 58 that closes the opening of the main body 57.
The lid body 58 is attached to the lower end portion of the pipe 53. The lower end of the pipe 53 opens into an adhesive storage chamber 59 formed inside the holder 56. In other words, the adhesive storage chamber 59 communicates with the inside of the pipe 53 and constitutes a part of the adhesive passage 55 described above.

  As shown in FIGS. 8 and 9, the application nozzle 21 is attached to the lower wall 57 a so as to penetrate the lower wall 57 a of the main body 57. That is, the adhesive storage chamber 59 is communicated with each application nozzle 21. The volume of the adhesive reservoir 59 is large enough to store the adhesive 14 by a predetermined amount so that the adhesive 14 supplied to the adhesive reservoir 59 is distributed to all the application nozzles 21. Is set to

  The length of the application nozzle 21 according to this embodiment is changed in accordance with the horizontal position of each application nozzle 21 because the lower wall 57a is formed to extend in the horizontal direction. That is, the coating nozzle 21 corresponding to the center in the longitudinal direction of the mounting piece 12 is the longest, and the coating nozzle 21 corresponding to both ends in the longitudinal direction of the mounting piece 12 is the shortest. The distance between the tip (lower end) of these application nozzles 21 and the adhesive surface 12a of the mounting piece 12 is formed so as to be equal in all the application nozzles 21 in this embodiment.

  As shown in FIG. 7, these application nozzles 21 are arranged in a rectangular shape when viewed from below. The rectangle formed by arranging these application nozzles 21 is formed in a size that surrounds the hole 17 of the attachment piece 12 when the attachment piece 12 is viewed from above. That is, the plurality of application nozzles 21 are arranged so as to surround the hole 17 when viewed from above.

Next, an adhesive application method using the adhesive application device 1 according to this embodiment will be described with reference to FIGS. 10A to 10C and the flowchart shown in FIG.
The adhesive applicator 1 according to this embodiment performs a preparatory operation before starting the operation of applying the adhesive 14. This preparatory operation is an operation in which the driving device 23 moves to the retracted position, and an operation in which the coating nozzle 21 and the adhesive supply device 22 rise to the standby position. This preparatory operation can be performed immediately after the application of the adhesive 14 is completed.

  In order to apply the adhesive 14, first, an operator or an automatic loading device places the injection assisting member 2 in a state where the flange 15 is fitted in the concave groove 34 of the support stage 32. When the operator loads the injection assisting member 2 on the support stage 32, the operator turns on a start switch (not shown), for example, and operates the holding device 33. In addition, when using an automatic injection | throwing-in apparatus, after the injection | pouring auxiliary member 2 is mounted on the stage 32 for support, the structure which the holding | maintenance apparatus 33 starts operation | movement automatically can be taken.

The holding device 33 moves the pressing member 36 in the horizontal direction along the elongated hole 35, and holds the injection assisting member 2 between the pressing member 36 and the stopper 32a. As the holding device 33 holds the injection assisting member 2 in this way, the support step S1 of the flowchart shown in FIG. 11 is completed.
Next, the horizontal movement device 41 moves the driving device 23 from the retracted position to the standby position. At this time, when the adhesive passage 55 of the adhesive supply device 22 is not filled with the adhesive 14, the valve 52 is opened and the adhesive 14 is supplied to the application nozzle 21. The valves 52 are closed in a state where the adhesive 14 flows out from all the application nozzles 21.

  After the drive device 23 moves to the standby position, the valve 52 of the adhesive supply device 22 is opened for a predetermined supply time and then closed. By opening and closing the valve 52 in this manner, as shown in FIG. 10A, a droplet 14a of the adhesive 14 is formed at the lower end of the application nozzle 21, and the adhesive supply step S2 of the flowchart shown in FIG. finish.

  Next, in the application step S3 of the flowchart shown in FIG. 11, the driving device 23 lowers the adhesive supply device 22 and the application nozzle 21 to the lowered position. As shown in FIG. 10B, the lowered position in this embodiment refers to the application nozzle 21 and adhesion when the droplet 14a of the adhesive 14 adheres to the upper surface (adhesion surface 12a) of the mounting piece 12. This is the vertical position of the agent supply device 22.

That is, by performing the application step S <b> 3, the droplet 14 a of the adhesive 14 adheres to the adhesive surface 12 a of the mounting piece 12. The adhesive 14 is applied to a position surrounding the hole 17 of the attachment piece 12 by a plurality of application nozzles 21 in a so-called stamp type.
After the adhesive 14 adheres to the mounting piece 12, the drive device 23 performs an operation of separating the adhesive 14 from the application nozzle 21 in the adhesive separation step S <b> 4 of the flowchart shown in FIG. 11.

When the application nozzle 21 rises in a state where the lower end of the application nozzle 21 is connected to the attachment piece 12 via the adhesive 14, the adhesive 14 extends upward by pulling the thread. After the yarn is stretched, the viscosity decreases and the yarn breaks. If the long stretched yarn breaks at the upper end (connection portion with the application nozzle 21) and falls down, the thread 17 may enter the hole 17 of the mounting piece 12.
In order to prevent the yarn made of the adhesive 14 from entering the hole 17 as described above, the driving device 23 first sets the application nozzle 21 and the adhesive supply device 22 to the yarn as shown in FIG. Is increased by a length L1 that is short enough to extend.

In this ascending stroke, a thread 61 made of the adhesive 14 having a length corresponding to the length L1 is formed. The length L1 is set to be shorter than the distance L2 (see FIG. 7) between the position where the adhesive 14 is applied on the mounting piece 12 and the hole 17. For this reason, even if the thread 61 having the length L1 is cut at the upper end and falls down, the thread 61 does not enter the hole 17.
The driving device 23 stops the application nozzle 21 and the adhesive supply device 22 until the yarn 61 is broken after the viscosity of the yarn 61 is lost after the ascending stroke.

The determination as to whether or not the yarn 61 has been cut is made based on the elapsed time after ascent. That is, the driving device 23 stands by until the time necessary for the yarn 61 to break after the first ascending stroke is completed. When this standby operation ends, the adhesive separation step S4 ends.
Thereafter, the drive device 23 raises the coating nozzle 21 and the adhesive supply device 22 to the standby position indicated by a two-dot chain line B in FIG. 5 in the return step S5 of the flowchart shown in FIG. Further, in this return step S5, the horizontal movement device 41 moves the driving device 23 to the retracted position indicated by a two-dot chain line A in FIG. 5, and the holding device 33 of the support portion 3 moves the pressing member 36 to the initial position. Return to position.

  As described above, the injection assisting member 2 coated with the adhesive 14 is supported by an injection assisting member transfer device (not shown) or an operator after each member is returned to the initial position in the return step S5. It is taken out from the stage 32 and sent to the next process. The injection assisting member 2 is adhered to a predetermined position of the mold assembly 6 in the next step.

Even in the case of adopting this embodiment, since the adhesive 14 is supplied by a constant amount equal to the volume of the droplet 14a, the supply amount of the adhesive 14 can be controlled.
Moreover, since the application | coating of the adhesive agent 14 can be performed in what is called a stamp type by dropping the some application nozzle 21 with respect to the attachment piece 12, it can implement | achieve with a simple mechanism.
Therefore, even in the case of adopting this embodiment, the plastic lens molding capable of controlling the application amount of the adhesive 14 while keeping the manufacturing cost low and easily applying the adhesive 14 to the curved mounting piece 12. A mold adhesive applicator can be provided.

  The adhesive supply device 22 according to this embodiment includes a holder 56 that supports all the application nozzles 21. The holder 56 is formed with an adhesive storage chamber 59 that communicates with each application nozzle 21 and is supplied with the adhesive 14 from an adhesive supply source (housing 51). The volume of the adhesive storage chamber 59 is formed so that the adhesive 14 is distributed to all the application nozzles 21.

  For this reason, in the adhesive application device 1 according to this embodiment, since the adhesive 14 is evenly supplied to all the application nozzles 21, the size of the droplets 14a held at the tips of the application nozzles 21 is substantially the same. It becomes constant. As a result, by applying the adhesive 14 to the injection assisting member 2 by the adhesive supply device 22 according to this embodiment, the adhesive 14 is reliably prevented from being mixed into the plastic lens material when the plastic lens is molded. Can do. Therefore, by using the adhesive application device 1 according to this embodiment, it is possible to manufacture a plastic lens with higher quality.

  The plurality of application nozzles 21 according to this embodiment are arranged so as to surround the hole 17 of the mounting piece 12. For this reason, since the whole area of the bonding surface 12a of the mounting piece 12 is bonded to the plastic lens mold, the injection assisting member 2 is firmly bonded to the mold. As a result, since the plastic lens molding die can be supported via the injection assisting member 2, the plastic lens molding die can be easily conveyed and positioned. Therefore, by using the adhesive application device 1 according to this embodiment, it becomes possible to automate the process of injecting the plastic lens material into the mold for molding the plastic lens, and the plastic lens can be manufactured at a lower cost. Will be able to.

  The adhesive supply device 22 for supplying the adhesive 14 to the application nozzle 21 is not limited to the structure shown in the above-described embodiment. As the adhesive supply device 22, one having a structure in which the adhesive 14 is supplied by flowing down by gravity can be used.

  In the above-described embodiment, the example in which the adhesive supply step S2 is performed before the coating nozzle 21 is lowered to the lowered position has been described. However, the adhesive supply step S2 can be performed after the coating nozzle 21 is lowered to the lowered position shown in FIG. 10B, and can be performed even while the coating nozzle 21 is being lowered. it can. Even in the case of adopting this configuration, the supply amount of the adhesive 14 can be easily measured because it corresponds to the volume of the adhesive 14 discharged from the application nozzle 21 formed of a pipe.

  DESCRIPTION OF SYMBOLS 1 ... Adhesive application apparatus, 2 ... Injection | pouring auxiliary member, 5 ... Plastic lens shaping | molding die, 6 ... Mold assembly, 9 ... Tape, 12 ... Mounting piece, 14 ... Adhesive, 14a ... Droplet, 17 ... Hole, 21 DESCRIPTION OF SYMBOLS ... Application nozzle, 22 ... Adhesive supply apparatus, 32 ... Supporting stage, 33 ... Holding apparatus, 41 ... Horizontal movement apparatus, 56 ... Holder, 59 ... Adhesive storage chamber.

Claims (3)

Supporting an injection assisting member having a mounting piece bonded to a peripheral wall of a hollow cylindrical mold for molding a plastic lens and having a hole for supplying a lens material communicating with an injection port opened in the peripheral wall A support part;
An application portion for applying an adhesive to the mounting piece of the injection assisting member supported by the support portion;
The attachment surface of the mounting piece is formed in a shape along the outer peripheral surface of the peripheral wall,
The application unit includes a plurality of application nozzles composed of pipes facing the mounting piece,
An adhesive supply device for supplying an adhesive to the application nozzle;
A drive device that changes the distance between the application nozzle and the mounting piece;
An adhesive applicator for plastic lens molds, wherein the distance between the tip of each applicator nozzle and the adhesive surface is uniformly formed in all applicator nozzles. The adhesive application device for a plastic lens mold according to claim 1, wherein the adhesive supply device includes a holder that supports all the application nozzles,
The holder is formed with an adhesive storage chamber that communicates with each application nozzle and is supplied with an adhesive from an adhesive supply source.
The adhesive coating apparatus for plastic lens molds, wherein the volume of the adhesive storage chamber is formed so that the adhesive is distributed to all the application nozzles.   3. The adhesive for plastic lens mold according to claim 1, wherein the coating nozzle is arranged so as to surround the hole of the mounting piece. Agent applicator.

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