JP2015020085A - Paste coating device and paste coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating method in which paste can be coated uniformly and accurately with an inexpensive device construction and without needing cleaning.SOLUTION: A paste coating method is the paste coating method using a paste coating device including a paste discharge mechanism and a squeegee which restricts paste thickness, and includes a process in which paste is coated by using the paste coating device and a paste thickness adjustment process in which the coated paste thickness is restricted by the squeegee and the paste of thickness exceeding a specified value is recovered by a recovery mechanism provided at the squeegee.

Description

  The present invention relates to a coating apparatus and a coating method for applying a paste uniformly and accurately to a component directly or via a transfer member.

  Conventionally, a paste coating apparatus has a squeegee approached to a member to be coated to a required film thickness width, and the paste supplied to the upper surface of the member to be coated is squeezed horizontally with respect to the member to be coated with a paste. A film is formed.

  In such a coating apparatus, paste accumulation occurs in the squeegee. Therefore, when repeated squeezing operations are performed, it is necessary to clean excess paste that has come out after squeezing.

  Patent Document 1 describes a die coater type coating apparatus using a die having a slit-like elongated discharge port. This die coater method is a method that can uniformly form a coating film on the surface of a member to be coated by discharging paste from the discharge port of the applicator onto the surface of the member to be coated and simultaneously moving the member to be coated. . Moreover, since only the necessary amount of paste is discharged, no cleaning is required.

  In the coating apparatus described in Patent Document 1, the thickness of the applied paste is determined by the moving speed of the member to be applied and the amount of paste discharged from the applicator. When the moving speed of the coated member is constant, the film thickness of the coating increases as the amount of paste discharged increases. Conversely, when the amount of paste discharged is constant, the applied paste The film thickness decreases as the moving speed of the member to be coated increases.

  In the coating apparatus described in Patent Document 1, in order to keep the thickness of the applied paste constant, it is possible to detect the relative movement amount of the applicator and the member to be coated, and to adjust the paste supply amount according to the movement amount. The paste is uniformly applied by controlling the capacity pump.

JP 2002-86044 A

  However, in the die coater method disclosed in Patent Document 1, it is necessary to detect the relative movement amount of the applicator and the member to be coated and to adjust the paste supply amount in order to keep the thickness of the paste to be applied constant.

  Therefore, the present invention provides a simple configuration that does not require detection of the relative movement amount of the applicator and the member to be coated and control of the paste supply amount, and can apply the paste uniformly and accurately without requiring cleaning. The purpose is to provide.

  In order to achieve the above object, the present invention provides a paste application method using a paste application device having a paste discharge mechanism and a squeegee for regulating the thickness of the paste, the paste application mechanism using the paste application mechanism. And a paste thickness adjustment step of regulating the thickness of the paste applied by the squeegee and recovering a paste having a predetermined thickness or more by a recovery mechanism provided in the squeegee. The present invention relates to a paste coating method.

  Further, the present invention is a paste application device having a paste discharge mechanism and a squeegee for regulating the thickness of the paste, the squeegee having a recovery mechanism for recovering a paste having a predetermined thickness or more, The paste coating apparatus includes a paste collection container for storing the paste collected by the collection mechanism.

  According to the paste coating apparatus of the present invention, a paste having a predetermined thickness can be formed using a squeegee, and excess paste can be collected, so that it is possible to provide a paste coating apparatus that does not require cleaning of the squeegee. It became.

It is the schematic of the paste coating apparatus of this invention. The flow of paste application of a 1st embodiment is shown. It is the schematic diagram which showed the operation | movement of the paste coating apparatus of 1st Embodiment. It is a schematic diagram which shows the relationship between the squeegee and transfer member of 1st Embodiment. It is the schematic which showed a mode that the squeezing of 1st Embodiment and a surplus paste were collected, attracted | sucked, and collect | recovered. It is the schematic diagram which showed the paste apply | coated with the application | coating method of 1st Embodiment. The flow of paste application of a 2nd embodiment is shown. It is the schematic diagram which showed the operation | movement of the paste coating apparatus of 2nd Embodiment. (A) Sectional drawing of transfer member of 2nd Embodiment, (b) The schematic diagram which showed the mode at the time of paste collection | recovery of a transfer member. It is a figure which shows the squeegee used in 2nd Embodiment.

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

  FIG. 1 is a schematic view of a paste coating apparatus of the present invention. In FIG. 1, a paste coating apparatus includes a coating mechanism having a syringe 2 for supplying a paste and a needle 3 for discharging the paste in the syringe 2, and a squeegee 1 for regulating the thickness of the paste provided near the coating apparatus. And have. Further, the paste application device has a squeegee, a syringe, a vertically moving air cylinder 4 for moving the needle up and down, and a paste collection container 5 for storing excess paste collected by a collection mechanism provided in the squeegee 1. ing.

  The paste application device also has a disc-shaped application member 6 that can rotate, an air cylinder 7 that moves the application member 6 to a squeezing position, and a motor 8 that rotates the application target member 6. The paste coating apparatus of the present invention has 1 to 5 coating sections and 6 to 8 stage sections.

  The paste application method of the present invention relates to a paste application method using a paste application device having a paste discharge mechanism and a squeegee for regulating the thickness of the paste. The paste application method includes a step of applying a paste using the paste application mechanism. The paste application method of the present invention regulates the thickness of the paste applied to the applied paste with a squeegee, and collects a paste having a thickness greater than a predetermined thickness by a recovery mechanism provided in the squeegee. Adjustment step.

  Moreover, the paste apparatus of this invention is related with the paste application | coating apparatus which has a paste discharge mechanism and a squeegee which regulates the thickness of a paste. The squeegee has a recovery mechanism for recovering the paste having the above thickness, and the paste coating apparatus has a paste recovery container for storing the paste recovered by the recovery mechanism.

(First embodiment)
FIG. 2 shows a paste application flow according to the first embodiment. The paste application of the first embodiment will be described with reference to the flow (a) to (g) of FIG. 2 and FIGS. FIG. 3 is a diagram showing a series of operations of the paste applying apparatus.

  The operation of FIG. 2A “moving the member to be coated to the squeezing position” will be described with reference to FIG. The member to be coated 6 of the paste coating apparatus of the present invention is usually located at a predetermined transfer position (position shown in FIG. 3 (a)), and the paste provided with a uniform film thickness on the member to be coated is transferred at this position later. Transfer to member. At the time of squeezing, the member to be coated 6 is moved from the transfer position to the squeezing position in the direction of the arrow by the moving member moving air cylinder 7 to the squeezing position.

  Next, the operation of “lowering the syringe, needle, and squeegee to the squeezing position” in FIG. 2B will be described with reference to FIG. The squeegee 1 is fixed to the movable part of the vertically moving air cylinder 4 together with the syringe 2 and the needle 3. The squeegee lower surface is slowly lowered to a height at which squeezing is performed so that the bottom surface of the squeegee does not contact the coated member 6 when the vertically moving air cylinder 4 is lowered. Further, the needle 3 is provided in the vicinity of the squeegee 1 so that the discharge port of the needle 3 is positioned higher than the squeegee 1.

  The operation of FIG. 2 (c) “application while rotating the member to be coated, discharging the paste, and collecting the excess paste” will be described with reference to FIG. 3 (c). Paste is put into the syringe 2, the vertically moving air cylinder 4 is lowered, and after the squeegee 1 and the needle 3 reach predetermined positions, the discharge valve (not shown) is opened and the paste is applied from the needle 3. Discharge toward the member 6. Simultaneously with the discharge of the paste, the coated member rotating motor 8 rotates the coated member 6 in the direction of the arrow 14 to squeeze the paste, and the squeegee 1 regulates the width and height of the paste discharged from the needle 3. . FIG. 4 is a schematic diagram showing the relationship between the squeegee of the present invention and the member 6 to be coated. 4A is a front view, FIG. 4B is a top view, and FIG. 4C is a bottom view. As shown in FIG. 4 (a), the squeegee 1 is provided with a rectangular step 9 and a step width 15. As shown in FIG. 4 (c), the step 9 is provided over the entire width of the squeegee. Moreover, the squeegee 1 has a groove 11 as shown in FIGS.

  The rectangular step 9 and step width 15 of the squeegee 1 are set according to the width of the pace applied to the member to be coated. By narrowing the gap 13 between the squeegee 1 and the member 6 to be coated, the paste can be prevented from protruding from the rectangular step 9 of the squeegee to the gap 13. It is preferable to use grease having a consistency in the range of 310 to 350 so that the height and width of the paste can be defined by the squeegee 1. The paste having a consistency number of 1 can be used.

  As shown in FIG. 4, the squeegee 1 is provided with a paste recovery hole 10 and a V-shaped groove 11 connected to the paste recovery container 5 by piping (not shown). Excess paste produced during squeezing can be scraped to the center of the squeegee 1 by the V-shaped groove 11. Further, the collected paste is sucked by an external ejector through a paste collection hole 10 provided in the vicinity of the rectangular step 9, and the paste is collected in the paste collection container 5, thereby preventing the paste from overflowing from the squeegee 1.

  FIG. 5 is a schematic diagram showing how the paste is squeezed by the coating method of the present invention, and excess paste generated by squeezing is collected and sucked and collected. The discharging of the paste from the needle 3 (not shown) and the squeezing to recover the excess paste are performed simultaneously, and the squeezing of the excess paste is continued during the squeezing. The paste is discharged and the excess paste is collected while the coated member rotating motor 8 is rotated once, and the squeezing is performed by rotating the coated member rotating motor 8 twice to regulate the height and width of the discharged paste. . These squeegeeing and recovery of excess paste may not be performed at the same time, and the paste accumulated in the squeegee 1 after squeezing may be recovered. Further, when applying the paste, the paste collected by suction may be reused as necessary. When reusing the paste, it is preferable to reuse the paste after degassing.

  Moreover, the schematic diagram which showed the paste shape after squeezing is shown in FIG. The squeegee 1 is provided with a rectangular step 9 and a step width 15. Further, since excess paste generated by squeegeeing by the squeegee 1 is recovered from the space recovery hole 10 provided inside the V-shaped groove 11, the paste 16 having a uniform thickness with a substantially rectangular cross section is obtained. It can apply | coat to a to-be-coated member with a sufficient precision.

  FIG. 2 (d) “Paste discharge completed”, FIG. 2 (e) “Syringe, needle and squeegee are raised to retracted position while rotating coated member”, (f) “Coated member to transferred member. Move to the transfer position ”. Specifically, the vertically moving air cylinder 4 is raised so that the squeegee 1 is retracted to the upper side in the direction perpendicular to the application surface of the application member 6, and the application member 6 is moved to a predetermined (transfer) position by the application member moving air cylinder 7. ) Return to position. When the squeegee 1 retreats to the upper side and moves horizontally to return to a predetermined (transfer) position, the syringe, needle, and squeegee rise to the retracted position while the member to be coated rotates, so that the squeegee and the member to be coated The stringing that occurs between them can be almost eliminated.

  When the pace applied to the member to be coated 6 is transferred, the operation shown in FIG. 2 (g) “pushing the member to be transferred to the member to be coated and transferring the paste” is performed. The ring-shaped transferred member adsorbed or gripped by the robot is pressed against the paste surface from the direction perpendicular to the uniform surface of the paste to transfer the paste to the application required portion of the transferred member. When the member 6 to be coated is a workpiece, there is no need to transfer the pace, so the step of FIG. 2 (g) is not performed.

  As described above, according to the embodiment of the present invention, by providing the squeegee 1 with the rectangular step 9 that regulates the coating thickness and width, the paste having a substantially rectangular cross section can be accurately obtained with a uniform thickness and width. Can be applied.

  Further, by forming the V-shaped groove 11 in the squeegee 1 in the direction opposite to the direction in which the squeegee 1 travels, overflow of the paste from the squeegee 1 can be prevented and excess paste can be collected.

  Further, since the squeegee 1 has 10 parts of paste collecting holes to be sucked and collected near the rectangular step 9 part, the paste scraped up by the V-shaped groove 11 can be sucked and collected from the holes. For this, it is possible to repeatedly apply the region of the paste without cleaning.

  Furthermore, since it is not necessary to control according to the situation, such as the amount of paste discharged and the moving speed of the member 6 to be coated, the paste can be uniformly applied to the transfer cloth member 6 with an inexpensive configuration.

  As an example, grease having a consistency of 330 (NPC IF10, manufactured by Nippon Shoyu Co., Ltd.) was used, the gap 13 between the lower surface of the squeegee and the transfer member was 0.1 mm, the rectangular step 9 was 0.3 mm, and the step width 15 was 8 0.0 mm. When the paste was applied at a rotational speed of 60 rpm of the transfer member rotation motor 8, the paste could be applied with an accuracy of a film thickness of 0.35 ± 0.05 mm.

(Second Embodiment)
The second embodiment relates to paste application that realizes a highly accurate paste film thickness. In the second embodiment, a squeegee and a member to be coated having different shapes from those in the first embodiment are used, and the steps of FIGS. 2E and 2F are different from those in the first embodiment.

  FIG. 10 is a diagram showing the squeegee 17 used in the second embodiment. 10A is a front view, FIG. 10B is a top view, and FIG. 10C is a bottom view. As shown in FIG. 10A, the squeegee 17 has a paste recovery hole 10 and a convex portion 21. The convex portion 21 has a height regulating surface 19 that regulates the height of the paste and a groove 20 that regulates the width of the paste inside. As shown in FIG. 10B, when the squeegee is viewed from the top, it does not have a groove or the like. Moreover, as shown in FIG.10 (c), when the squeegee is seen from the lower surface, it has the height control surface 19 and the groove | channel 20 which controls a width | variety.

  FIG. 9A shows a cross-sectional view of the member to be coated, and FIG. 9B shows the state of the paste, the member to be coated, and the squeegee when the member to be coated is laterally moved. As shown to Fig.9 (a), the to-be-coated member 18 has a groove | channel on the outer side of an application surface and an application surface. As shown in FIG. 9B, by eliminating the rectangular step from the squeegee 1 in FIG. 4A, the thickness of the paste can be kept uniform even if the member to be coated moves laterally. Furthermore, as shown in FIG. 9A, by providing a groove outside the application surface of the member to be applied, the squeegee 1 moves horizontally along the transfer surface as shown in FIG. 9B. This makes it possible to collect a small amount of paste that is generated during thread trimming. Further, the paste collected at this time may be degassed and reused.

  FIG. 7 shows a flow of paste application according to the second embodiment. The paste application method of the second embodiment shown in FIG. 7 is performed when the squeegee 1 is retracted from the application target member 6 in FIG. 2 (e) “Syringe, needle, squeegee is raised to the retracted position” of the first embodiment. This is a paste application method that prevents the slight stringing that occurs. The coating method of the second embodiment can accurately define the height of the paste by preventing stringing. Hereinafter, description will be made with reference to FIGS. 7A to 7G and FIGS.

  FIG. 8 is a schematic diagram showing a series of operations. FIG. 8A shows an operation of “moving the coated member to the squeezing position” in FIG. FIG. 7B shows the operation of “lowering the syringe, needle, and squeegee to the squeezing position” in FIG. 7B. The steps of FIGS. 7A to 7B are the same as the operation of the first embodiment.

  FIG. 7C shows the operation of FIG. 7C “application while rotating the member to be applied, discharging the paste, and collecting the excess paste”. In the second embodiment, a squeegee 17 different from that in the first embodiment is used.

  In FIG. 7 (c) “Coating while rotating the member to be coated, discharging the paste, and collecting the excess paste”, the paste is applied in the same manner as in the first embodiment except that the squeegee 17 is used.

  FIG. 7D shows “paste discharge completed” and the next operation is started.

  Next, in FIG. 7E, “the member to be coated is moved to the transfer position to the member to be transferred while rotating the member to be coated”, the member to be coated is retracted in the horizontal direction and moved to the transfer position. FIG. 8D shows the operation of FIG. 7E “moving the coated member to the transfer position to the transferred member while rotating the coated member”.

  In FIG. 8D, the member to be coated is moved horizontally in the horizontal direction indicated by the arrow by the transfer member moving air cylinder 7 while rotating the member to be coated 17 without raising the squeegee 17. By operating the squeegee 17 in this manner, stringing between the squeegee 17 and the member to be coated 18 can be prevented, and a paste having a uniform film pressure can be applied. When grease having a consistency of 320 or more and 350 or less is used as a paste, stringing is likely to occur. Therefore, it is preferable to move the transfer member 6 in the horizontal direction as described above.

  FIG. 8E shows the operation of FIG. 7F “raising the syringe, needle, and squeegee to the retracted position”. As shown in FIG. 8 (e), when the vertically moving air cylinder 4 is raised, the squeegee 17, the needle 3 and the syringe 2 are moved to the retracted position before the next cycle starts. Thereby, when the member 18 to be applied moves to the application position, the paste agent can be prevented from entering the center of the member to be applied, and the paste can be applied to a necessary range.

  By the method described above, when the member 18 to be coated is separated from the squeegee, the member 18 to be coated rotates and moves horizontally, thereby preventing slight stringing that occurs in the squeegee 1 and the member 18 to be coated. . For this reason, stringing in the thickness direction does not occur in the squeegee and the paste, and it becomes possible to apply the paste with a highly accurate film thickness.

DESCRIPTION OF SYMBOLS 1 Squeegee 2 Syringe 3 Needle 4 Vertical movement air cylinder 5 Paste collection container 6 Application member 7 Application member movement air cylinder 8 Application member rotation motor 9 Rectangular step 10 Paste collection hole 11 (V-shaped) groove 12 Squeegee Lower surface 13 Gap between the lower surface of the squeegee and the member to be coated 14 Rotating direction 15 Step width 16 Uniform paste having a substantially rectangular cross section 17 Squeegee 18 Member to be coated 19 Height regulating surface 20 Groove for regulating the width 21 Projection

Claims (12)

A paste application method using a paste application device having a paste discharge mechanism and a squeegee that regulates the thickness of the paste,
Applying a paste using the paste application mechanism;
A paste thickness adjusting step of regulating a thickness of the paste applied by the squeegee and recovering a paste having a predetermined thickness or more by a recovery mechanism provided in the squeegee; Application method.   The paste application method according to claim 1, wherein the step of applying the paste and the step of adjusting the thickness of the paste are performed simultaneously.   The paste application method according to claim 1, wherein the paste collected in the paste thickness adjusting step is degassed and reused.   The said squeegee has a convex part which has the height control surface which controls the height of a paste, and the groove | channel which controls the width | variety of a paste inside, The Claim 1 thru | or 3 characterized by the above-mentioned. Paste application method. In the step of applying the paste, the paste is applied to a member to be coated having a groove on the outer side of the application surface and the application surface;
5. The step of adjusting the thickness of the paste, wherein the member to be coated includes a step of retracting the member to be coated that retreats horizontally with the transfer surface of the member to be coated. The paste application | coating method as described in any one. In the step of applying the paste, the paste is applied to the member to be applied,
In the thickness adjustment step of the paste, the thickness of the paste is adjusted with a squeegee having a rectangular step that regulates the thickness and width of the pace,
4. The squeegee retracting step in which the squeegee retracts upward in the direction perpendicular to the application surface of the member to be coated after the paste thickness adjusting step. 5. The paste application method according to one item. A paste application device having a paste discharge mechanism and a squeegee for regulating the thickness of the paste,
The squeegee has a recovery mechanism for recovering a paste having a thickness greater than or equal to a predetermined thickness.
A paste application apparatus comprising a paste collection container for containing the paste collected by the collection mechanism.   The paste application apparatus according to claim 7, wherein the squeegee has the recovery mechanism having a hole for recovering the paste in the groove.   The paste application apparatus according to claim 8, wherein the squeegee has the recovery mechanism that sucks and recovers the paste from the hole.   The said squeegee has a convex part which has the height control surface which controls the height of a paste, and the groove | channel which controls the width | variety of a paste inside, The Claim 7 thru | or 9 characterized by the above-mentioned. Paste applicator. The paste coating apparatus has a member to be coated,
The paste application apparatus according to any one of claims 7 to 10, wherein the member to be applied has a groove for accumulating the paste outside the transfer surface.   The paste application apparatus according to any one of claims 7 to 9, wherein the squeegee has a rectangular step that regulates a thickness and a width of a pace.

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