JPH0576812A - Automatic feeding device for paste material - Google Patents

Abstract

PURPOSE:To prevent hardening or deterioration of a paste material in a discharge needle due to drying. CONSTITUTION:A blocking means 14 provided with an elastic component 19 being in contact with the end of the discharge needle 5 to be able to separate is installed and constituted in a manner of blocking selectively a discharge outlet at the end of the discharge needle 5 in an automatic feeding device for a paste material provided with a means of positioning the end of the discharge needle 5 positioned at an optional position on a table on which a discharge means 6 for discharging the paste material 2 out of the discharge outlet at the end of the discharge needle 5 and a printed wiring board are fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention sequentially supplies a paste material such as a solder paste or an adhesive to a required position of a paste material supply member such as a printed wiring board by a pinpoint method.
The present invention relates to an automatic paste material feeder.

A flow method and a reflow method are known as a technique for fixing and mounting a surface mount component (hereinafter referred to as SMD) on a printed wiring board. In the flow method, the SMD is temporarily fixed on the printed wiring board with an adhesive,
This is a method of fixing by contacting with jet solder.
On the other hand, the reflow method is a method in which after applying a solder paste on a printed wiring board in advance, the SMD is placed and the solder paste is melted in a high temperature atmosphere to fix the solder paste.

In this type of SMD mounting method, a screen printing method is known as a technique for applying a solder paste or an adhesive onto a printed wiring board. In the screen printing method, however, parts are already formed on the printed wiring board. Since it is not effective in the case of being mounted or in the case of high-mix low-volume production, in such a case, a paste material automatic supply device (hereinafter also referred to as a dispenser) that sequentially supplies / applies a solder paste or an adhesive by a pinpoint method. ) Is used.

[0004]

2. Description of the Related Art A dispenser is a table to which a printed wiring board is fixed and a discharge means for controllably discharging a paste material such as a solder paste or an adhesive contained in a syringe tank from the tip of a discharge needle (syringe needle). This device is provided with a means for positioning the tip of the discharge needle at an arbitrary position above, and is a device adapted to sequentially apply a paste material on a printed wiring board by a pinpoint method.

The positioning means is a needle moving type in which the ejection needle is moved with respect to the table for fixing the printed wiring board, and a table for moving the table for fixing the printed wiring board with the ejection needle fixed. There are a mobile type and a mixed type in which these are mixed.

The solder paste is a powdery solder material,
It is a paste formed by mixing a flux and a solvent so as to have a required viscosity.

[0007]

However, conventionally, since the discharge port at the tip of the discharge needle is always exposed to the air, when the operation is stopped due to a trouble or the like,
If the paste material is not discharged for a long period of time, such as when there is a gap in the manufacturing lot due to seams or when the operation is carried over to the next day, the paste material dries in the discharge needle and hardens There was a problem that the needle was clogged and frequent maintenance was required.

If such clogging occurs when it is applied to an unmanned production line, it is a particular problem because it affects the entire line. Further, there is a problem that the quality of the paste material is deteriorated such that the viscosity of the paste material becomes non-uniform, which may cause a trouble in mounting SMD or the like which is planned in the subsequent steps.

The present invention has been made in view of the above points, and an object of the present invention is to cause clogging of the ejection needle and quality even if the paste material is not ejected for a long time. Is to prevent the deterioration.

[0010]

[Means for Solving the Problems] Discharging means for discharging a paste material from a discharge port at the tip of a discharge needle and positioning the tip of the discharge needle at an arbitrary position on a table to which a supply target member (printed wiring board) is fixed. The paste material automatic supply device including the means for performing the above is configured as follows.

When the paste material is not discharged by providing an elastic member that comes into contact with and separates from the tip of the discharge needle, the elastic member is pressed against the tip of the discharge needle to close the discharge port and discharge the paste material. In this case, the elastic member is separated from the tip of the ejection needle to open the ejection port.

[0012]

According to the present invention, when the paste material is not discharged, the discharge port at the tip of the discharge needle is closed by the elastic member. Therefore, the paste material in the discharge needle is isolated from the outside air, so that the paste material dries. As a result, the occurrence of clogging of the discharge needle can be prevented.

Further, since the viscosity of the paste material is always constant, it is possible to prevent deterioration of the quality and reliability of the paste material.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention. In the figure, 1 is a syringe tank containing a solder paste 2, one end of an air tube 3 is connected to the upper portion of the syringe tank 1, and a needle fixing member 4 is attached to the lower portion.

A syringe needle (discharging needle) 5 having a through hole at its center is attached to the lower portion of the needle fixing member 4.
The other end of the air tube 3 is connected to an air supply device (not shown), and the solder paste 2 is discharged from the discharge port at the tip of the syringe needle 5 according to the amount of air supplied from the air supply device. There is.

Discharge means 6 is constituted by the syringe tank 1, the syringe needle 5, etc., and the discharge means 6 is supported by a sliding member 8 provided on the main body member 7 in a sliding manner. The ejection unit 6 is moved up and down (Z direction) by being slid by a driving device (not shown). Although not shown, the main body member 7
Is further freely positioned and moved in the XY directions (the surface direction of the table on which the printed circuit board is fixed).

Reference numeral 9 denotes a closing means. The closing means 9 has a holder 1 at the other end (tip end) of an arm member 10 whose one end (base end) is fixed to the lower portion of the main body member 7 by a bolt.
1 is formed, and an elastic member 12 made of an elastic body such as rubber is fixed in the holder 11.

A through hole 12a is formed in the central portion of the elastic member 12. The through hole 12a is closed by its own elasticity when nothing is done, and is formed so that the syringe needle 5 can be press-fitted therethrough. This through hole 12a can be easily understood by imagining, for example, a hole for air filling of a ball used in various ball games.

As shown in FIG. 1A, the discharge means 6 has a syringe needle 5 whose tip is in the middle of the through hole 12a of the elastic member 12 (standby position a) and (B). The tip of the syringe needle 5 penetrates the through hole 12a of the elastic member 12 and slightly protrudes (reference position b at the time of supply), or as shown in (C), further protrudes and is fixed on the table. The printed wiring board 13 is positioned at any of the positions (supply position c) that reach the surface of the printed wiring board 13.

However, during operation (during the coating operation), the movement of the discharging means 6 to the reference position a and the supply position c at the time of supply is repeated with the movement of the discharge means 6 in the XY directions, and the supply position c. In, the air is supplied by the air supply device, and a predetermined amount of the solder paste 2 is discharged from the tip of the syringe needle 5, so that the solder paste is sequentially applied onto the printed wiring board 13.

When the supply of the printed wiring board 13 is delayed due to a seam in the manufacturing lot and the time becomes long, the operation is stopped due to a trouble or the operation is carried over to the next day, the solder paste is discharged for a long time. If not, the tip of the syringe needle 5 is set to the standby position a. That is, in this state, since the tip of the syringe needle 5 is located in the middle of the through hole 12a of the elastic member 12, the discharge port of the syringe needle 5 is in a closed state. Therefore, the solder paste 2 in the syringe needle 5 can maintain a predetermined viscosity without drying.

FIG. 2 is a diagram showing the configuration of the second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. That is, this embodiment is constructed by providing the closing means 14 in place of the closing means 9 in the first embodiment.

The closing means 14 fixes a rotary actuator 15 having an actuating shaft 16 that is controllably rotated to the lower portion of the main body member 7, and the actuating shaft 16 of the rotary actuator 15 is fixed.
In addition, one end (base end) of the arm member 17 is integrally fixed, and a holder 18 is formed at the other end (tip), and an elastic member 19 made of an elastic body such as rubber is provided in the holder 18. It is configured by fixing.

When the tip of the syringe needle 5 is at the standby position, the arm member 17 is rotated clockwise by the actuator 15 so that the elastic member 19 is pressed against the tip of the syringe needle 5 from the lower side. The ejection port of the needle 5 is closed to prevent the solder paste 2 from drying.

On the other hand, when the tip of the syringe needle 5 is moved to eject the solder paste 2, the actuator 15 is used.
By the arm member 17 being rotated counterclockwise in the figure by the elastic member 19, the elastic member 19 is separated from the tip of the syringe needle 5 to open the ejection port of the ejection needle 5, and the elastic member 19 is placed at a position that does not cause an obstacle. It is to evacuate.

FIG. 3 is a diagram showing the configuration of the third embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. That is, this embodiment replaces the closing means 9 of the first embodiment with the closing means 20.
Is provided and configured.

The closing means 20 fixes a pair of linear actuators (pneumatic type or electromagnetic type) 22 having an operating shaft 21 that slides in a linear direction to the lower portion of the main body member 7, and the operating shaft 21 of the linear actuator 22 is One end portion (base end portion) of the pair of arm members 23 is integrally fixed, and elastic members 25 made of an elastic body such as rubber are fixed inside a holder portion formed at the other end portion (tip end portion). As shown in the figure, they are arranged to face each other. In addition, 26 is a spring for urging the respective arm members 23 in a direction in which they are separated from each other.

However, as shown in FIG. 1A, when the tip of the syringe needle 5 is at the standby position a, the linear actuator 22 is actuated and the respective actuating shafts 21 project, so that a pair of The tip of the syringe needle 5 is laterally clamped by the elastic member 25, and the ejection port of the syringe needle 5 is closed.

On the other hand, when the tip of the syringe needle 5 is moved to the reference position b or the supply position c at the time of supply for discharging the solder paste, when the operation of the pair of linear actuators 22 is released, the action of the spring 26 causes The pair of arm members 23 move in the respective directions to separate from each other, and the syringe needle 5
The discharge port of is opened.

FIG. 4 is a diagram showing the configuration of the fourth embodiment of the present invention. Although only the structure of the closing means is shown in the same drawing, the other parts have the same structure as the first embodiment.

The closing means 27 is rotatably supported by a shaft 29 so as to intersect an intermediate portion of the pair of arm members 28, and the shaft 29 is fixed to a lower portion of the main body member 7, and the closing means 27 of the main body member 7 is also provided. Actuating shafts 31 of a pair of linear actuators (pneumatic or electromagnetic) 30 fixed to the lower portion are pivotally attached to one end of each arm member 28, and an elastic member is attached to a holder portion formed at the other end of the arm member 28. Three
2 are fixed to each other.

However, as shown in FIG. 3A, when the tip of the syringe needle 5 is in the standby position, the linear actuator 30 is operated to operate the operating shaft 3.
1 extends, the elastic members 32 come into pressure contact with each other, and the tip of the syringe needle 5 is sandwiched, whereby the discharge port of the syringe needle 5 is closed.

On the other hand, as shown in FIG.
When the tip of the syringe needle 5 is moved to eject the solder paste, the actuation of the actuator 30 is released, so that the actuation shaft 31 is buried, whereby the pair of elastic members 32 are separated from each other, and the ejection of the syringe needle 5 is completed. It is intended to open the exit.

FIG. 5 is a diagram showing the configuration of the fifth embodiment of the present invention. In the first to fourth embodiments, the elastic member is always positioned near the syringe needle 5 by attaching the closing means to the main body member 7. However, in this embodiment, the printed wiring board 13 is used. Table 3 for fixing
An elastic member 34 is fixedly attached to the upper part of the structure 3.

When the solder paste is not discharged for a relatively long time, the discharging means 6 is moved to position the syringe needle 5 so that the tip of the syringe needle 5 is pressed against the elastic member 34. The discharge port is closed. The configuration is very simple.

In the above-mentioned first to fifth embodiments, the needle moving type in which the ejection needle is moved in the directions of three axes (X axis, Y axis, Z axis) has been described as an example. Is not limited to this, and the present invention may be applicable to a table moving type in which the table 33 for fixing the printed circuit board 13 is moved in three axial directions or a mixed type thereof. Needless to say.

[0037]

As described above in detail, since the present invention is constituted by providing the elastic member for releasably closing the discharge port at the tip of the discharge needle, the paste material is not discharged for a relatively long time. In this case, the ejection needle 5
It is possible to suppress the drying of the paste material inside, and it is possible to prevent clogging of the ejection needle and deterioration of the quality of the paste material due to hardening of the paste material.

As a result, the frequency of maintenance is reduced, and problems are less likely to occur even when applied to an unmanned production line.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth exemplary embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a fifth exemplary embodiment of the present invention.

[Explanation of symbols]

 2 Solder paste (paste material) 5 Syringe needle (discharging needle) 9, 14, 20, 27 Closing means 12, 19, 25, 32, 34 Elastic member 13 Printed wiring board

Claims (3)

[Claims] 1. A discharge means (6) for discharging the paste material (2) from a discharge port at the tip of the discharge needle (5) and a tip of the discharge needle (5) at an arbitrary position on the supply target member (13). In the paste material automatic supply device provided with a means for positioning, an elastic member (12,
A paste characterized in that a closing means (9, 14, 20, 27) having (19, 25, 32, 34) is provided, and the discharge port at the tip of the discharge needle (5) is selectively closed. Automatic material feeder. 2. The automatic paste material supply device according to claim 1, wherein the elastic member (19) is fixed to a tip end portion of an arm member (17), and a base end portion of the arm member (17) is ejected. The arm member (17) is rotatably supported in the vicinity of the needle (5), and when the paste material (2) should not be discharged, the elastic member (19) is pressed against the tip of the discharge needle (5). And a drive means (15) for rotating the elastic member (19) away from the tip of the ejection needle (5) when the paste material (2) is to be ejected. An automatic feeder for paste material. 3. The automatic paste material supplying device according to claim 1, wherein a pair of elastic members (25, 32) are configured to be contactable and separable in a state of being opposed to each other with the discharge needle (5) interposed therebetween. When the paste material (2) is not to be discharged, the elastic members (25, 32) are brought into pressure contact with each other, and when the paste material (2) is to be discharged, a means (22, 30) for separating them is provided. An automatic paste material supply device characterized in that