JP4739764B2 - Adhesive applicator - Google Patents

Description

  The present invention relates to an adhesive application device, and in particular, an adhesive supplied from an adhesive supply unit suitable for use when applying an adhesive on a printed circuit board in a surface mounting device for electronic components, The present invention relates to an adhesive application device for discharging and applying on an object.

  2. Description of the Related Art In an electronic component surface mounting apparatus, an adhesive application device that applies an adhesive onto a printed circuit board for temporarily fixing a mounted component is known (see Patent Document 1).

  For example, as shown in FIG. 1, a conventional adhesive application device discharges an adhesive 10 onto a syringe 20 filled with the adhesive 10 and a printed circuit board 8 that is connected to the lower end of the syringe 20 and used. Nozzle 30 is provided.

  As shown in FIG. 2, the coating head 40 including the syringe 20 and the nozzle 30 can be moved relative to the printed circuit board 8 in the X direction and the Y direction. The positioning mechanism includes an X moving unit 42X and a Y moving unit 42Y. It is mounted on.

  As shown in detail in FIG. 1, the nozzle 30 includes a body portion 32, a needle portion 34, a flange portion 36 for fixing to the coating head 40 (see FIG. 2), and a height of the discharge port at the tip of the needle portion 34. And a stopper portion 38 for determining the thickness.

  With the nozzle 30 attached to the lower end of the syringe 20, the adhesive 10 packed in the syringe 20 is pressurized with, for example, air pressure, so that the adhesive 10 passes through the nozzle 30 as shown in FIG. Then, it is automatically applied to a predetermined position on the printed circuit board 8.

JP 2001-170538 A JP-A-5-228415 JP-A-5-262

  However, in the conventional technique, when the syringe 20 and the nozzle 30 are exchanged, there is a problem that air enters the adhesive 10 near the boundary between the syringe and the nozzle. In this case, since the adhesive used has a high viscosity, the air in the adhesive 10 remains as bubbles 12 as it is. If the application of the adhesive 10 is continued in this state, the remaining bubbles 12 move to the outlet of the nozzle 30 in accordance with the flow of the adhesive 10 and eventually come out of the discharge port. . Therefore, the problem that the adhesive is not discharged over one point or a plurality of points occurs.

  For this reason, the conventional adhesive applicator cannot automatically replace the nozzle 30 and uses the syringe 20 and the nozzle 30 as a set.

  In production demanded by the market, multiple types of coating are required depending on the shape and size of the target element, so multiple nozzles must be used, and conventional adhesive coating devices have multiple A syringe is required, and as a result, a plurality of (three in FIG. 2) coating heads 40 must be mounted as shown in FIG.

  Patent Document 2 describes that a nozzle rotation mechanism is provided between the syringe and the nozzle so that the amount of adhesive discharged from the nozzle is variable, and Patent Document 3 describes that the slide between the syringe and the nozzle is slid. It is described that a pitch switching device of the type is provided to automatically switch the coating pitch of the adhesive.

  However, in both Patent Documents 2 and 3, the nozzle is fixed, and the nozzle cannot be automatically replaced.

  The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to enable a plurality of types of adhesive application with a single application head.

The present invention relates to an adhesive application device for applying an adhesive supplied from an adhesive supply unit onto a target by a nozzle, a plurality of nozzles for discharging the adhesive, comprising a nozzle changing mechanism for connecting one with adhesive supply, wherein the nozzle changing mechanism is provided with a plurality of nozzles mounting opening for mounting a plurality of nozzles, the nozzle mounting port of the plurality of A plurality of adhesive flow passage openings connected to each other, and a rotatable rotary nozzle provided with a guide groove connecting the ends of the plurality of adhesive flow passage openings to each other; The adhesive is supplied through one hole, and the hole is provided at a position that coincides with one end of the adhesive flow passage opening connected to the nozzle that discharges the adhesive. Plan Grooves by being disposed so as not to be blocked with the adhesive the adhesive therein is filled in the plurality of adhesive flow path opening during rotation of the rotary nozzle, is obtained by solving the above problems.

  Furthermore, a means for preventing leakage of the adhesive from the unused nozzle is provided.

According to the present invention, even when the rotary nozzle is rotated, the adhesive always supplied from the adhesive supply unit and the adhesive filled in the plurality of adhesive flow passage openings of the rotary nozzle come into contact with each other. Intrusion of air can be prevented and bubbles can be prevented from being formed.
Further , according to the present invention, even a coating that requires a plurality of types of coating can be applied with only one coating head. Thereby, the space which an application | coating head has becomes small and the whole apparatus can also be made small.

  Further, since the weight of the coating head is reduced by reducing the size of the coating head, (1) the structure supporting the coating head can be reduced, and the entire apparatus can be further reduced. Furthermore, (2) the acceleration G of the coating head can be increased, the production cycle of the apparatus can be shortened, and the productivity can be improved. Furthermore, (3) since the maximum torque of the drive motor for operating the coating head and the structure can be reduced, a motor with low power consumption can be used, and the power consumption of the entire apparatus can be suppressed, making it economical.

  Furthermore, since it is possible to apply with only one application head, it is not necessary to have a plurality of drive units for the same purpose, the drive units of the entire apparatus can be reduced, and the reliability of the apparatus is increased. Further, the power consumption of the entire apparatus can be suppressed, which is economical.

  Furthermore, it is possible to attach a plurality of nozzles having the same configuration and different angles, and a mechanism for driving the rotation angle of the nozzle, which has been conventionally required, is not required, and space saving, economy, and high reliability are possible.

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

  As shown in FIG. 4 (perspective view) and FIG. 5 (cross-sectional view), the first embodiment of the present invention is a syringe 20 that can be exchanged into a cartridge type when the adhesive 10 is filled and the adhesive is empty. And a rotatable rotary nozzle 50 having a plurality (four in the figure) of nozzle attachment ports 50A, a drive motor 60 for rotating the rotary nozzle 50, and rotation of the motor 60 to the rotary nozzle 50 Timing pulleys 62 and 64 and a timing belt 66 for transmission, and a joint block 70 that secures a path of the adhesive 10 between the syringe 20 and the rotary nozzle 50 are provided.

  As shown in detail in FIG. 5, the rotary nozzle 50 includes a rotary base 52 that fixes the rotary nozzle 50, a bearing 54 that allows the rotary nozzle 50 to rotate, and an adhesive 10 that does not leak through the rotating portion. Thus, a gasket 56 fixed to the rotary base 52 is provided.

  As shown in detail in FIG. 6, the gasket 56 is provided with a single hole 56 </ b> A for securing a flow path for the adhesive 10 at a position eccentric with respect to the entire gasket 56.

  Further, as shown in detail in FIGS. 5 and 6, the rotary nozzle 50 is provided with an adhesive channel port 50B connected to the nozzle mounting port 50A, and a guide groove 50C connecting the channel port 50B in a circular shape. Yes.

  The gasket 56 prevents the adhesive from flowing directly into the flow path port 50B of the nozzle 80 that is not used. However, since the guide groove 50C is present, the flow path of the adhesive is not completely blocked. Therefore, in order to completely block the flow path so that the adhesive does not leak from the unused nozzles 80, as shown in FIG. A C-shaped shielding plate 90 made of, for example, a spring material for preventing leakage of the adhesive in contact with the tip is also provided.

  An example of the shape of the nozzle 80 attached to the nozzle attachment port 50A is shown in FIG.

  In the above configuration, the rotary nozzle 50 is rotated by the drive motor 60. Since a plurality of nozzles 80 can be attached to the rotary nozzle 50, the position of the nozzle can be changed by rotating the rotary nozzle 50, and the type of nozzle can be changed.

  As the drive motor 60, for example, a stepping motor or a servo motor capable of positioning the rotation angle of the rotary nozzle 50 can be used. Therefore, by positioning the rotation angle of the rotary nozzle 50 by the drive motor 60, the nozzle can be automatically changed when a plurality of different nozzles 80 are used in a scene.

  At this time, as shown in FIG. 6, the eccentric hole 56A of the gasket 56 is provided at a position that coincides with the flow passage port 50B connected to the nozzle that discharges the adhesive, and the adhesive is provided in the plurality of flow passage ports that do not discharge the adhesive. Is designed to block direct flow. Thereby, an adhesive agent flows easily only to the nozzle to be used.

  Here, the guide groove 50C connecting the plurality of adhesive flow path ports 50B provided in the rotary nozzle 50 is filled in the adhesive filled in the rotary base 52 and the plurality of adhesive flow path ports 50B when the rotary nozzle rotates. It is provided so as not to block the adhesive. As a result, even when the rotary nozzle 50 is rotated, the adhesive of the rotary base 52 and the adhesive of the rotary nozzle 50 are always in contact with each other, so that air can be prevented from entering the adhesive and bubbles can be prevented. .

  In the above embodiment, the shielding plate 90 is fixed and the unused nozzles are automatically closed with the rotation of the rotary nozzle 50. However, as in the second embodiment shown in FIG. The shield plate 92 and its drive unit 94 are provided. The rotary plate 50 is rotated by separating the shield plate 92 from the nozzle tip when the rotary nozzle 50 rotates, and pressing the shield plate 92 against the nozzle tip after the rotary nozzle stops rotating. It is also possible to make the nozzle tip reliable and close the nozzle tip.

  In this case, since there is no need to select a flow path at the gasket portion, the flow path configuration in the rotary nozzle 50 is simplified as shown in FIG. 10, and the hole 56B is provided at the center as shown in FIG. It is also possible to simplify the shape of the O-ring or use an O-ring instead of the gasket.

  In each of the above embodiments, the rotation angle of the rotary nozzle 50 is controlled by using a pulse motor or a servo motor as the drive motor 60. However, the rotary nozzle 50 includes a slit plate and a reading sensor thereof. Etc., the accuracy of the stop position of the rotary nozzle can be improved.

  The rotation method of the rotary nozzle 50 is not limited to the combination of the timing belt 66 and the timing pulleys 62 and 64, and a chain and a gear may be used in combination. Furthermore, a method of rotating the rotary nozzle is arbitrary, such as a rack and pinion, a ball screw and a worm gear, a ball screw and a bevel gear, a direct motor, and a pneumatic device instead of a motor.

  Further, the rotation surface of the nozzle is not limited to a vertical surface, and the nozzle can be rotated in a horizontal plane, or the rotary nozzle can be rotated in an inclined surface of 45 degrees, for example.

  In the embodiment, the nozzle is replaced by rotating the rotary nozzle 50. However, the nozzle can be replaced by a slide mechanism.

Sectional drawing which shows the principal part structure of the conventional adhesive agent coating apparatus The perspective view which similarly shows the whole structure Similarly expanded sectional view showing the state where the adhesive is applied The perspective view which shows the structure of 1st Embodiment of this invention. Same sectional view Similarly exploded perspective view Similarly, a side view seen from the right side of FIG. A perspective view showing an example of the same nozzle shape The right view which shows 2nd Embodiment of this invention. Same sectional view Plan view showing the shape of the gasket

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Adhesive 20 ... Syringe 40 ... Coating head 50 ... Rotary nozzle 50A ... Nozzle attachment port 50B ... Channel port 50C ... Guide groove 52 ... Rotary base 56 ... Gasket 56A, 56B ... Hole 60 ... Drive motor 62, 64 ... Timing pulley 66 ... Timing belt 70 ... Joint block 80 ... Nozzle 90, 92 ... Shield plate

Claims (2)

In the adhesive application device for discharging and applying the adhesive supplied from the adhesive supply unit onto the object by the nozzle,
A plurality of nozzles for discharging adhesive;
A nozzle replacement mechanism for connecting one of the nozzles to the adhesive supply unit;
Equipped with a,
The nozzle replacement mechanism includes a plurality of nozzle attachment ports for attaching the plurality of nozzles, a plurality of adhesive passage ports respectively connected to the plurality of nozzle attachment ports, and a plurality of adhesive passage openings. Having a rotatable rotary nozzle with a guide groove connecting one end to the other,
Adhesive is supplied to the guide groove from the adhesive supply section through one hole, and the hole is connected to one end of the adhesive passage opening connected to the nozzle for discharging the adhesive. Further, the guide groove is provided so that the adhesive in the guide groove is not blocked from the adhesive filled in the plurality of adhesive passage openings when the rotary nozzle is rotated. An adhesive application device characterized by the above.   The adhesive application device according to claim 1, further comprising means for preventing leakage of the adhesive from the unused nozzle.

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