JPS6234667A - Cream-like liquid applying device - Google Patents

Abstract

PURPOSE:To execute soldering by solder of a stable feed quantity, by moving a pair of rollers which are rotated in opposite directions at each different speed so that its rotation bite side becomes the upper side, so that the roller of a higher speed contacts to an object to be applied. CONSTITUTION:Two sets of applying mechanisms 21 which have been constituted in the same way and have been formed symmetrically to each other are provided on both sides of right and left by making shafts 6, 11 serve as a boundary. As for the applying mechanism 21, a pair of rollers 31, 32 having the same diameter have a prescribed gap between the respective peripheral surfaces and rotate in the directions as indicated with arrows B, C, and also the roller 32 rotates at a higher speed than the roller 31. When a cream solder 33 is supplied to the upper side bite part of both these rollers 31, 32, the cream solder 33 passes through the gap and adheres to the peripheral surface of the high speed side roller 32, as a thin film. In this state, the cream solder on the peripheral surface of the roller 32 is applied onto a work by moving horizontally the right and left applying mechanisms 21 toward a receiving shaft 11, and depressing the work on a pan 10 in the direction as indicated with an arrow, in a state that the right and left rollers 32 have approached the receiving shaft 11.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cream liquid applicator for applying a cream liquid such as cream solder to a soldering part placed on a table. It is something.

[Conventional technology]

In recent years, electronic components have improved in performance and become smaller in size, and high-density flat package electronic components have been developed in which the spacing between pins serving as external connection terminals is, for example, 0.6 mm.

When mounting such electronic components on a printed circuit board, with conventional through-hole type devices, it is necessary to apply a metal pattern around the periphery of each pin hole, and there is no space between the holes. For example, it requires more than z5n space, so
This cannot be adopted.

Therefore, the printed circuit board on which this type of flat package type electronic component is mounted needs to be made of a non-perforated type, and instead, a connection pattern consisting of parallel lines corresponding to the many pins protruding from the periphery of the electronic component must be applied on the printed board. Conventionally, screen printing has been used to create this type of connection pattern. This screen printing involves preparing a screen plate with a large number of parallel line grooves as the pattern described above, stacking it on a printed board, supplying Cree-4 solder onto it, and applying the cream solder using a rubber plate-like squeegee. The cream solder is transferred from the pattern groove to the printed board while pressing the solder.

[Problem that the invention seeks to solve]

However, such conventional screen printing for soldering electronic components requires precision machining in order to create pattern grooves on the screen plate overlaid on the printed board, which not only results in extremely high processing costs, but also causes problems on the printed board. If there are existing parts on the board, printing is impossible because the screen plates cannot be stacked, and if there are steps or warps on the printed board, there is a problem that printing is unstable. Furthermore, when copying cream solder, if the alcohol contained in the cream solder evaporates and becomes semi-hardened, or if the solder balls, which are the main component of cream solder, have an irregular shape, the pattern grooves become clogged and the pattern There is a problem in that the formation of the apparatus is not stable, and clogging 9 occurs unless the apparatus is operated continuously during use, making it unsuitable for small-scale production.

[Means for solving problems]

In order to solve these problems, the present invention includes at least a pair of cream liquid loading rollers that are driven by a drive device and rotate in opposite directions at different speeds so that the rotational biting side is on the upper side. - In addition to providing the rollers in parallel in height, a moving means is provided to move the faster application roller of the pair of rollers in a direction parallel to the roller axis so that it comes into contact with and separates from the object to be coated with the liquid. Ta. 'Furthermore, as an additional structure to the above structure, the object to be coated is placed on a table that can be driven by an axis, and a rotating means is provided for rotating this table by a predetermined amount while the coating part 2 and the object to be coated are separated. has been established.

[Effect]

With this configuration, when the high-speed application roller moves and rotates a pair of rollers so that they are in contact with the object to be coated, and the cream-like liquid is supplied to the rotating spout portions of both rollers, the rotation of the rollers is reduced. As a result, this creamy liquid adheres to the peripheral surface of the coating roller that moves faster, and is transferred to and adheres to the object to be coated. Moreover, when the object to be coated is rotated by a predetermined amount together with the stand while the roller is being separated and the roller is brought into contact with the object to be coated again, the creamy liquid is applied to other parts of the object to be coated.

〔Example〕

1 to 3 show an embodiment of an apparatus for soldering electronic components according to the present invention, which is equipped with a rotating mechanism for an object to be coated,
FIG. 1 is a front view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged front view of the application section.

In these figures, above a rectangular pace plate 1, a rectangular slide table 2 parallel to the rectangular pace plate 1 is supported by a plurality of columns 3 fixed to the pace plate 1. . Bearings 4 and 5 are fitted concentrically to the upper and lower slide tables 2 and the pace plate L. The small diameter portion 6a and the jib are each supported rotatably and vertically, and there is a space between the lower end of the large diameter portion 6c, which is formed short to enable vertical movement, and the pace plate 1. , slide the stepped part of the table 2
A compression coil spring 1 is interposed to urge the rotation shaft 6 upward so that it comes into contact with the rotation shaft 6 .

Reference numeral 8 denotes a nine rotator which is fitted into the large diameter portion 6c of the rotary shaft 6 and has two types of chamfered portions 8a and gb of different heights on four perpendicular directions, and has a keyway extending over its entire length. 8c has the rotation axis 6
A key 9 fixed to the side is fitted, and is configured to integrally rotate the rotation shaft 6 and allow vertical movement thereof. A receiving shaft 11 having a removable receiving plate 10 at the upper end is fitted into a shaft hole drilled in the upper end of the rotating shaft 6, and is fixed with a screw. As shown in Fig. 3, a flat package type electronic component 12 (hereinafter referred to as work 12) is formed into a rectangular shape in plan view and has a large number of vias 12a projecting radially from four circumferences.
is placed. On the other hand, a pivot cylinder 14 is swingably supported on a pivot shaft 13 installed in one corner of the pace plate 1, and a threaded portion formed at the working end of the piston rod 15 has a U-shaped thread. The shaped rod ends are screwed together and fixed with nuts. 1T is an arm integrally formed with the rotor 8, which is pivotally attached to the tip of the rod end 16 via a pin 18, and which rotates the piston rod 15 of the rotary cylinder 14 from the state shown in FIG. When the arm 1T moves backward, the rotator 8 is configured to rotate by 90° via the arm 1T. Therefore, the workpiece 12 is also rotated by 90 degrees via the rotation shaft 6. Oh,
In the illustrated state, a positioning stopper 3T, which will be described later, is in contact with the chamfered portion 8a Ka, and the rotation of the rotor 8 is restricted, but in reality, as will be described later, the positioning stopper 3
When T is away from the chamfered portion 8a, the rotating cylinder 1
4 is activated, the rotation of the rotator 8 is not hindered. Reference numeral 19 denotes a metal fitting screwed to the pace plate 1, on which a stopper 20 with a bolt is supported so as to be adjustable in forward and backward movement and fixed with a nut. It is configured to restrict rotation at the illustrated position.

Next, a mechanism for applying cream solder to the workpiece 12 will be explained. In this embodiment, as shown in FIG.
Two sets of application mechanisms 2 having the same configuration and formed symmetrically with each other
1 are arranged on both the left and right sides of the shaft 6.11, and gears, rollers, etc. of the application mechanism 21 on the left side are omitted from illustration. Each coating mechanism 21 is provided with a drive plate 22 that is formed to be able to slide on the slide table 2 and move freely in the direction of distance from and near the rotation axis 6.
is fixed. A small gear 24 is pivotally mounted on the bracket 23 and rotates in the direction indicated by an arrow in the figure by being driven by a drive device (not shown), and meshes with a large gear 25 that is also pivotally mounted on the bracket 23. A large gear 26 that rotates coaxially with the small gear 24 is in mesh with another small gear 2T that is pivotally mounted on the bracket 23, and this small gear 2T is further engaged with a small gear 28 that is pivotally mounted on the bracket 23. They mesh together. Then, the shaft 29 of the large gear 25 and the small gear 2B
The shafts 29 and 30 are located at the same height as the shafts 30 of the
gear 25.2 with a predetermined gap between their circumferential surfaces.
As is clear from the meshing of gears 24 to 28, roller 31 and roller 32 are provided integrally with arrow B.
, C rotate in opposite directions with the biting side facing upward, and the roller 32 rotates at a higher speed than the roller 31 due to speed increase and deceleration during transmission. Both rollers 3 rotate in opposite directions with a speed difference in this way.
1. A predetermined amount of cream solder 33 is supplied to the upper injection part of 32 by a supply device (not shown), and the solder cream 33 is
, 320 rotations, this cream solder 33 passes through the gap and adheres to the circumferential surface of the high-speed side row 232 as a thin film. The left and right coating mechanisms 21 configured in this manner are provided with advancing and retreating means for moving them back and forth in opposite directions. That is, both the left and right ends of the drive plate 22 extend in the front and rear directions below the slide table 2, and the front ends of the left and right horizontal members 22&, 22b shown in FIG. are connected with. This floating cylinder 34 has a U-shaped metal fitting 35 bolted to one horizontal member 22a.
The working end of the piston rod 34b is fixed to the other horizontal member 22b. With this configuration, when pressure fluid is sent from the boat 34e to the head end side, the piston rod 34b moves forward and the cylinder 341 moves back by the same amount at the same time, causing the left and right application mechanisms 21 to rotate. They each move in a direction away from the moving axis 6. Furthermore, when pressure fluid is fed from the port 24d to the rod end side, the piston rod 24b retreats and the cylinder 241 moves forward by the same amount at the same time, causing the left and right application mechanisms 21 to approach the rotation shaft 6, respectively. Moving. At the rear ends of the left and right horizontal members 22m and 22b, a head bolt-shaped stopper 3T is formed parallel to the floating cylinder 34 so as to be movable and adjustable, and is fixed with a nut, and its head end surface is connected to the above-mentioned. By coming into contact with the chamfered portion 8a or 8b of the rotator 8, the forward limit of the application mechanism 21 is restricted.

The radius of the chamfered portion 8& and the chamfered portion 8b are different because they correspond to the long sides and short sides of the workpiece 12.

Further, stoppers 38 are provided at both left and right ends of the slide table 2, and are configured to restrict the retracting limit of the application mechanism 21 by bringing the drive plate 22 into contact with the stoppers 38. Then, the left and right application mechanisms 21 move forward, and the workpiece 1 is placed in a state where the left and right rollers 32 are close to the bearing shaft 11.
2, the pin 121 of the workpiece 12 comes into contact with the rotating roller 32, and the cream solder 33, which has adhered to the curved surface as a thin film, is applied in a fixed amount to the pin 22&. Any means may be used to push down the work 12, but if a soldering device is provided above the present device, a member that holds and raises the work 12 can also be used as the push down means.

The operation of the cream liquid applicator configured as above will be explained. As shown in the figure, a rectangular workpiece 12 is placed on the receiving tray 10 in a horizontal direction with its long side extending in the left-right direction in FIG. 1 with the receiving shaft 11 being raised. At this time, since the entire application mechanism 21 has moved away from the bearing shaft 11, when the pressure fluid is fed to the rod end side of the floating cylinder 34, the drive plates 22 on both sides integral with the cylinder 34 & piston rod 34b The coating mechanisms 21 on both sides, each of which has component parts thereof, simultaneously move in the direction of the bearing shaft 11. Also, at this time, the piston rod 15 of the rotary cylinder 14 has retreated and the rotor 8 has rotated 90 degrees counterclockwise from the position shown in FIG. The stoppers 37 on both sides come into contact with the chamfered portion 8b of the rotator 8, thereby stopping the rotation. At this time, if the stopper 37 is adjusted to move in the axial direction according to the dimensions of the work 12, the roller 32 can be moved between the pins 12 of the work 12 and
It can be placed directly below. So, both mouths-93
By supplying the cream solder 33 to the upper rotating injection part 1, 32 and starting the drive source, the rollers 31, 32 are rotated, and the workpiece 12, the receiving shaft 11, and the rotating shaft 6 are When the stepped portion is pushed down against the elastic force of the compression coil spring T until it touches the bearing 5, the lowering of the rotating shaft 6 is regulated and the pin 12m of the workpiece 12 is moved to the position of the roller 32 as shown in FIG. Contact the top of the circumferential surface. In this case, due to the tooth number ratio of gears 24 to 2B, roller 32 is higher than roller 3.
Since roller 1 and roller 31 are both rotating at high speed, the slower roller 31
The cream solder 33 uniformly adheres to the surface of the faster roller 32 in the form of a thin film, and the rotation of the roller 32 causes the solder 33 to be drawn out and scooped out. A uniform amount is applied to the pins 12& on the short side.

Therefore, after the push-down by the push-down means is released and the bearing shaft 11 is raised, the pressure liquid is fed to the head end side of the floating cylinder 34, the application mechanism 21 is retreated, and the drive plate 22 hits the stopper 38. Stop when touching. When the piston rod 15 of the swing cylinder 14 is advanced, the rotor 8 is rotated by 90 degrees to the illustrated position via the arm 1T, and the short side of the workpiece 12 is rotated from left to right in FIG. 1 and FIG. 3. It is vertically oriented, extending in the direction. Therefore, the forward movement of the application mechanism 21 and the depression of the workpiece 12 by the push-down means are repeated again to apply the cream solder 33 to the pins 12 & on the long sides of the workpiece 12. In this case, the application mechanism 21
In the forward position of , the stopper 3T touches the other chamfer 9 of the rotator 8.
Since it is regulated by contacting part a&, pin 1
The position of 2& and the position of row 232 can be made to correspond. In addition, during the above-mentioned application, the application can be made more stable by rotating the roller 32 while keeping it in contact with the pin 12 and then moving the roller 32 horizontally to remove it.

The above describes the second invention as set forth in claim 2, in which the workpiece 12 as the object to be coated is placed on the tray 10 as the axially driveable table, and the workpiece 12 is rotated while the coating mechanism 21 is withdrawn. Although the invention has been described in which a structure for applying a creamy liquid to a plurality of places on the workpiece 12 is added to the main structure by applying the creamy liquid to the workpiece 12, the first invention shown in claim 1 does not include this structure. Since its main structure and operation are the same as those of the second invention, a description thereof will be omitted.

In the embodiment described above, two sets of application mechanisms 21 were provided, but only one set of application mechanisms 21 may be provided. Further, it would be more effective if the moving cylinder 34 and rotator 8 rotating cylinder 14 of the coating mechanism are capable of multi-point positioning control, so that even if the coating mechanism 21 is a single set, Enables application to multiple locations.

Furthermore, although this embodiment shows an example in which the rotating shaft 6 that receives the workpiece 12 is raised and lowered, the coating mechanism 21 as a whole is also configured to be movable in the vertical direction, so that it can be applied to the workpiece that is stationary in the vertical direction. The application mechanism 21 may be moved up and down. Further, the creamy liquid for application is not limited to cream solder, and may be, for example, paint, ink, or paste.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, in a cream applicator, at least a pair of cream liquids are driven by a drive device and rotate in opposite directions at different speeds so that the rotary biting side is the upper side. The mounting rollers are arranged in parallel at the same height, and the rollers are moved parallel to the roller axis so that the faster speed application roller of the pair of rollers comes into contact with and separates from the object to be coated. By providing a moving means, it is possible to apply solder to locations that are impossible with conventional screen printing machines, expanding the range of applications, and making it possible to apply solder according to the width of the part to be coated that comes in contact with the roller. Since the amount of solder is obtained, the amount of solder supplied is stable in the case of soldering. Furthermore, since the creamy liquid circulates where the pair of rollers rotate, the effects of hardening or deterioration of the creamy liquid are reduced.

Furthermore, in the second invention, the object to be coated is placed on a table that can be driven by an axis, and a rotation means is provided for rotating this table by a predetermined amount while the application roller and the object to be coated are separated. , since the cream liquid can be applied to multiple locations on the object to be coated,
The range of applications is further expanded.

[Brief explanation of drawings]

1 to 3 show an embodiment of the creamy liquid applicator according to the present invention, FIG. 1 is a front view thereof, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged front view of the applicator. be. 6...rotating shaft, 8...rotator, 10...saucer, 12...workpiece, 12a...e bottle, 14...
... Swing cylinder, 24, 25° 26.27, 28.
e・・Gear, 31.32・φ・・Roller, 34・・・・
floating cylinder.

Claims (2)

[Claims] (1) At least a pair of cream liquid loading rollers that are mounted parallel to each other at approximately the same height with a predetermined gap between their circumferential surfaces, and these rollers are arranged in a direction in which the upper side is the biting side. a rotation driving means for rotating at different speeds; and a moving means for moving the faster application roller of the pair of rollers in a direction parallel to the roller axis so as to contact and separate from the object to be coated with the liquid. A cream liquid application device characterized by being provided with. (2) At least a pair of cream liquid loading rollers that are mounted parallel to each other at approximately the same height with a predetermined gap between their circumferential surfaces, and these rollers are arranged in a direction in which the upper side is the biting side. a rotation driving means for rotating at different speeds; and a moving means for moving the faster application roller of the pair of rollers in a direction parallel to the roller axis so as to contact and separate from the object to be coated with the liquid. and a rotating means for placing the object to be coated on a table that can be driven by a shaft and rotating the table by a predetermined amount while the application roller and the object to be coated are separated. A cream liquid application device.