JP3080173U - Printing paste supply device - Google Patents

Abstract

(57) [Summary] [Problem] To stir and knead a printing paste contained in a syringe very efficiently, and extrude it from a discharge port of the syringe in a state where viscosity suitable for screen printing is imparted, and supply the paste to a screen printing apparatus. Send. The present invention is configured such that a synthetic resin syringe (A) and a paste (1) accommodated in the base end opening (A2) are stirred, kneaded, and extruded from a discharge port (A4) of the syringe. And a mixer unit B. The mixer unit B includes a lid 2 hermetically fitted into the base end opening, and a belt drive mechanism B3 disposed on the lid.
And a mixer member B1 operatively connected thereto via a transmission B2, protruding into the syringe A and driven to rotate around its central axis, and slidably and integrally rotated with the mixer member B1. It comprises a movably mounted pressure member 12 and a compressed air supply pipe for supplying compressed air into the syringe A and forcibly sliding the pressure member toward the discharge port A4 of the syringe. .

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, a solder paste prepared by kneading a solder alloy powder and a high-viscosity liquid flux into a creamy paste, a syringe containing a printing paste such as a conductive adhesive, and the like are extruded to form a squeegee device for a screen printing machine. It relates to a device for supplying to an object.

[0002]

[Prior art]

 An apparatus for supplying a printing paste of this type, wherein a printing paste contained in a syringe is moved by air pressure of compressed air supplied into the syringe or via a moving plate which is moved by the air pressure. And pressurized, and extruded from a discharge port of the syringe and fed to a screen printing apparatus are already known.

[0003]

[Problems to be solved by the invention]

 In screen printing, the squeegee slides linearly while in contact with the upper surface of the screen plate, and the sliding causes the printing paste to be forcibly filled into the pattern openings of the screen plate, and then passes through the openings to the printing material. In order to achieve uniform printing quality or finished state and to improve printing accuracy, it is generally required to prevent a change in the viscosity of the printing paste during each printing. When the paste for soldering is a solder paste and it is printed on a printed circuit board by screen printing, it is necessary to be able to supply a solder paste with a certain viscosity suitable for printing at all times, which promotes the miniaturization of printed circuit boards As a result, high-density printing with a screen plate having microscopic pattern openings has been demanded. Te is particularly important.

Among the solder pastes currently on the market as screen printing solder pastes for printed circuit boards, a solder alloy powder having a composition of about 63% Sn and about 37% Pb with a bottom melting point and a high-viscosity liquid flux are kneaded to obtain a flux-containing solder paste. Those with an amount of around 9.3% are widely used. Such commercially available solder paste is sold in a syringe-like container or a short-bottomed cylindrical container made of a synthetic resin.

By the way, such a solder paste does not have fluidity in a standing state, and has a property of becoming fluid when stirred or vibrated, that is, a substance having a chixolotopic property. However, it is difficult to use the product as it is removed from the container for screen printing, and it is necessary to impart viscosity suitable for printing by stirring and kneading when using. However, in the above-mentioned known paste supply device for printing, which merely extrudes the paste simply by using air pressure, since the function of sufficiently stirring and kneading the paste is lacked, A separate process or device for stirring and kneading the paste supplied from the supply device before printing is required.

[0006] The present invention has been made in view of the above-mentioned problems, and a state in which a printing paste contained in a syringe is extremely efficiently stirred and kneaded to impart a viscosity suitable for screen printing. In particular, a screen which can be sent out from the discharge port of the syringe, and which can be printed on a printed circuit board through the pattern opening of the screen plate while supplying the built-in solder paste onto the screen plate. It is an object of the present invention to provide a printing paste supply device suitable for supplying a solder paste to a squeegee device main body of a printing press.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object of the present invention, a printing paste supply apparatus according to the present invention is mounted on a syringe and a base opening thereof, and the printing paste contained in the syringe is stirred and kneaded. What is claimed is: 1. A printing paste supply apparatus comprising: a mixer unit configured to be extruded from a discharge port of a syringe, wherein the mixer unit hermetically fits into a base end opening of the syringe; A mixer comprising a belt driving mechanism disposed on a body, and a plurality of rods operatively connected to the belt driving mechanism via a transmission device, and protruding into the syringe and driven to rotate about its central axis. A member and a plurality of ring-shaped fins on the outer peripheral surface which are in airtight elastic contact with the inner peripheral surface of the syringe, and a circular recess is formed on the upper surface, so that the mixer member can slide freely on the mixer member. A rubber pressurizing member having a substantially cylindrical shape and rotatably mounted integrally with the mixer member, and supplying compressed air into the syringe from a proximal end opening side thereof. And a compressed air supply pipe for forcibly sliding the pressurizing member toward the discharge port side of the syringe. For advantageous embodiments of the invention, reference is made to the respective claims.

[0008]

[Embodiment of the invention]

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

FIGS. 1 to 3 show an example of a printing paste supply apparatus according to the present invention, wherein A is a syringe formed of a synthetic resin such as polypropylene, and B is the base end opening A2 of the syringe A. This is a mixer unit configured to stir and knead the stored printing paste 1 therein and to extrude it from the discharge port A4 of the syringe. The syringe A has a cylindrical peripheral wall portion A1, and an outwardly extending annular projection A3 is formed at a base end opening A2.

The mixer unit B is composed of a lid 2 airtightly fitted to the base end opening A2 of the syringe A, and a plurality of rods protruding into the syringe and driven to rotate around its central axis. The mixer B1 is provided with a mixer member B1 for stirring and kneading the solder paste 1, and a belt drive mechanism B3 for imparting a rotational movement to the mixer member B1 via a transmission B2. In the illustrated example, the belt driving mechanism B3 is fixed to an upper protruding portion 3A of a tubular rotary shaft 3 that penetrates a lid 2 and protrudes vertically, and has a knurl 4A engraved on an outer peripheral surface. A large-diameter driven vehicle, a small motor 5 projecting downward from the horizontal projection 2A of the lid 2, and an output shaft 5A of the motor penetrating through the horizontal projection and projecting upward. A motor vehicle 6 is fixed and has a small diameter and has a knurl on the outer peripheral surface thereof, and an endless belt 8 stretched between the motor vehicle and the driven vehicle 4 via a tension wheel 7. . The transmission B2 is fixed to the tubular rotating shaft 3 and a lower protruding portion 3B thereof in such a manner that the lower protruding portion is vertically penetrated, and at least two rods 9A constituting the mixer member. 9B and a disk-shaped rotating body 10 implanted at each eccentric position. Reference numeral 11 denotes a pressurizing member which is supplied with compressed air into the syringe A from the proximal end opening side and is slidably mounted on the mixer member B1 and rotatably integrated with the mixer member. 12 is a compressed air supply pipe for forcibly sliding the nozzle 12 toward the discharge port A4 side of the syringe, and the compressed air supply pipe 11 is slidably inserted into the shaft hole 3C of the tubular rotary shaft, Further, it is open on the lower surface of the rotating body 10.

The pressing member 12 is formed of a rubber material in a substantially cylindrical shape, and includes a cylindrical body 18 and a substantially hemispherical lower end 19. The body 18 has a diameter slightly smaller than the inner diameter of the cylindrical peripheral wall A1 of the syringe A, and the upper and lower ends of the outer peripheral surface thereof have a diameter slightly smaller than the inner diameter of the cylindrical peripheral wall A1 of the syringe A. Large diameter annular fins 23 and 24 are provided, respectively. The fins 23 and 24 are air-tightly and elastically contacted with the inner peripheral surface of the peripheral wall portion A1 so as to be able to move vertically with the body portion 18. A circular recess 20 is formed on the upper surface of the body 18 so as to be concentrically concave so as to efficiently receive the air pressure of the compressed air supplied from the compressed air supply pipe 11. That is, when the compressed air flows into the recess 20, the pressure member pushes down the pressurizing member 12 downward. As a result, the fins 23 are strongly elastically contacted by the peripheral wall portion A1 and the airtightness by the elastic contact is increased. As a result, the air during the downward movement of the pressurizing member 12 is increased. Leaks can be effectively prevented. The pressure member 12 is attached to the rods 9A and 9B through insertion holes 21 and 21 of pipes 22 and 22 buried from the bosses 25 and 25 formed on the recess 20 to the lower end 19, respectively. The distal ends of the rods 9A and 9B extend downward through the pressure member 12.

Reference numeral 13 denotes an annular fitting portion that protrudes downwardly from the lower surface of the lid 2, and the lid 2 is positioned at the base opening A 2 side of the syringe A in the annular fitting portion 12. It is to be fitted. In the illustrated example, a screw 13A is formed on the outer peripheral surface of the annular fitting portion 13 of the lid 2, and the screw 13A is formed on the lower surface of the lid inside the annular fitting portion 13. An annular gasket 14 is attached to the top surface of the outwardly extending annular projection A3 of the syringe proximal opening A2. Reference numeral 15 denotes an O-ring fitted to the syringe A from the discharge port A4 side and stopped at the lower surface of the outwardly extending annular projection A3. The O-ring 15 is similarly fitted to the syringe A from the discharge port A4 side. The attached mounting ring 16 elastically contacts the lower surface of the annular projection A3. In the example shown in the drawing, the mounting ring 16 is formed to have a substantially U-shaped cross section, and a screw portion 16B capable of screwing with the thread 13A of the annular fitting portion is provided on the inner surface of the outer peripheral wall 16A. The cover 13 is formed by screwing the screw 13A into the screw portion 16B and pressing the annular gasket 14 against the upper surface of the annular projection A3. It can be fitted tightly to Reference numeral 17 denotes a screw portion formed on the inner wall surface of the discharge port A4 of the syringe A, and a screw (not shown) having a thread is screwed onto the screw portion 17 to remove the discharge port. A4 can be opened and closed.

In the printing paste supply device configured as described above, when the mixer unit B is mounted on the base end opening A2 of the syringe A containing the printing paste 1 and the small motor 5 is started, the rotation of the small motor 5 is started. Is transmitted to a large-diameter driven vehicle 4 via a small-diameter driving wheel 6 and an endless belt 8, and the rotation of the driven vehicle 4 is transmitted to a mixer member B 1 via a tubular rotary shaft 3 and a rotating body 10. The eccentric rods 9A and 9B constituting the member and the pressing member 12 mounted on those rods are integrally driven to rotate. In this case, the driving wheel 6 and the driven wheel 4 as belt wheels are provided with knurls on their outer peripheral surfaces and the tension wheels 7 are used, so that the belt 8 can be prevented from slipping and the transmission power can be reduced. Can also be increased.

When the rods 9A and 9B constituting the mixer member B1 rotate in this way, the eccentric rods having different radii of rotation perform the stirring operation of the solder paste 1 while drawing concentric circles. It is possible to efficiently stir and knead the solder paste 1 and to impart fluidity and viscosity suitable for printing to the paste. In this case, since the pressing member 12 also rotates while being in contact with the solder paste 1 from above, the effect of stirring and kneading the paste 1 can be further enhanced.

Next, when the mixer member B1 is caused to perform the above-described stirring operation and at the same time, compressed air is introduced from the outside into the syringe A through the compressed air supply pipe 11, the pressurizing member 12 becomes concave. 20 is forced to slide by receiving the air pressure of the compressed air, so that it moves downward while rotating and presses the solder paste 1 on its lower surface. As a result, the stirring and kneading effect is further enhanced, and the extrusion speed is also increased, so that the mixture can be smoothly fed to a predetermined target object through the syringe discharge port A4.

Since the present invention is configured as described above, according to the present invention, the printing paste contained in the syringe is agitated and kneaded very efficiently while effectively utilizing air pressure, and is used for screen printing. A printing paste supply device which can be delivered from the discharge port of the syringe in a state where a suitable viscosity is imparted, and which can exhibit various benefits as described above. Printing paste supply device for supplying a solder paste to a squeegee device main body of a screen printing machine configured to be able to print on a printed circuit board through a pattern opening of the screen plate while supplying the paste onto the screen plate. Can be obtained. In addition, the squeegee device embodying the present invention itself does not require a process or an apparatus for stirring and kneading the paste because the present invention has the above-described effects.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of an embodiment of the present invention device in a longitudinal section.

FIG. 2 is a schematic vertical sectional side view of the embodiment of the device of the present invention shown in FIG. 1;

FIG. 3 is an enlarged exploded side view showing a part of the embodiment in a longitudinal section.

FIG. 4 is a perspective view of an embodiment of a pressing member used in the device of the present invention.

FIG. 5 is a schematic vertical sectional side view of the embodiment of the pressing member shown in FIG. 4;

[Explanation of symbols]

 Reference Signs List A syringe A2 base end opening A3 annular projection A4 discharge port B mixer unit B1 mixer member B2 transmission device B3 belt drive mechanism 1 printing paste 2 lid 2A horizontal projection 3 tubular rotating shaft 3A upward projection 3B downward projection 3C shaft hole 4 driven vehicle 4C knurl 5 small electric motor 5A output shaft 6 prime mover 7 tensioner 8 endless belt 9A, 9B rod 10 rotator 11 compressed air supply pipe 12 pressurizing member 13 annular fitting portion 13A screw 14 annular gasket 15 O-ring 16 Mounting ring 16A Outer peripheral wall 16B Screw 18 Body 19 Lower end 20 Concave 21, 21, Insertion hole 22, 22, Pipe 23, 24 Fin 25, 25 Boss

Claims (3)

[Utility model registration claims] 1. A syringe unit made of a synthetic resin and a mixer unit which is mounted on a base end of the syringe and is configured to stir and knead a printing paste contained in the syringe and to extrude the paste from a discharge port of the syringe. A printing paste supply device, wherein the mixer unit has a lid hermetically fitted to a base end opening of the syringe, a belt driving mechanism disposed on the lid, and the belt driving mechanism. A mixer member consisting of a plurality of rods operatively connected to the syringe via a transmission device and projecting into the syringe and rotating around its central axis, and hermetically contacting the outer peripheral surface with the inner peripheral surface of the syringe. A plurality of annular fins, and a circular recess formed in the upper surface, the fin being slidably mounted on the mixer member and rotatable integrally with the mixer member; A rubber pressurizing member having a cylindrical shape, and compressed air being supplied into the syringe from the base opening side thereof to forcibly slide the pressurizing member toward the discharge port side of the syringe. And a compressed air supply pipe for causing the paste to be supplied. 2. The large-diameter driven wheel according to claim 1, wherein the belt driving mechanism is fixed to an upwardly projecting portion of a tubular rotating shaft that penetrates through the lid and projects vertically. A small motor fixed to the lid, a small-diameter motor vehicle fixed to the output shaft of the motor, and an endless belt stretched between the motor vehicle and the driven vehicle. The transmission device comprises the tubular rotating shaft, and a rotating body having a plurality of rods constituting the mixer member implanted therein, which are fixed to the lower projecting portion in such a manner that the lower projecting portion is vertically penetrated. Wherein the compressed air supply pipe is slidably inserted into a shaft hole of the tubular rotary shaft and is opened at a lower surface of the rotating body. 3. The printing paste supply device according to claim 1, wherein the syringe is fitted from a discharge port side to a lower surface of an outwardly extending annular projection formed at a base end opening of the syringe. While the O-ring is elastically contacted via the mounting ring, an annular gasket capable of abutting on the upper surface of the annular projection is attached to the lower surface inside the annular fitting portion of the lid, and the annular fitting portion of the lid is attached. The screw formed on the outer peripheral surface is screwed into a screw formed on the inner peripheral surface of the outer peripheral wall of the mounting ring having a substantially U-shaped cross section, and the annular gasket is pressed against the upper surface of the annular projection to thereby press the lid. A printing paste supply device characterized in that the body can be fitted airtightly into a base end opening of the syringe.