JP2000301691A - Stirring-supplying device of paste for printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stir and knead very efficiently paste for printing held in a syringe and to extrude it from a discharge port of the syringe to be supplied to a screen printing apparatus, in a state of being given the fluidity and viscosity suitable for screen printing. SOLUTION: A stirring-supplying device of paste for printing is composed of a syringe A made of synthetic resin and a mixer unit B fitted removably to a base end opening A2 of the syringe and so constituted as to stir and knead the paste 1 held in the syringe and to extrude it from a discharge port A4 of the syringe. The mixer unit B is composed of a cover body 2 put airtightly on the base end opening, a belt drive mechanism B1 disposed on the cover body and a plurality of stirring rods B3 which are connected to operate with this mechanism through the intermediary of a transmission mechanism B2 including a planet gear mechanism and which project into the syringe A and are rotated around the central axis of the syringe and also on their own axes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solder paste prepared by kneading a solder alloy powder and a high-viscosity liquid flux into a cream, and a paste containing a printing paste such as a conductive adhesive material. The present invention relates to a device for extruding this from a discharge port at the tip of the syringe and supplying it to an object such as a squeegee device of a screen printing machine.

[0002]

2. Description of the Related Art This type of printing paste agitating / supplying device includes a printing paste contained in a syringe, which is agitated by a single elongated rod-shaped rotating member directly connected to a motor, and is provided in the syringe. The present invention proposes an apparatus in which the compressed air is supplied by air pressure or is pressed through a moving plate moved by the air pressure, and is pushed out from a discharge port of the syringe and fed to a screen printing apparatus. Already known.

[0003]

In screen printing, a squeegee slides linearly in contact with the upper surface of the screen plate, and the sliding causes the printing paste to forcibly fill the pattern openings of the screen plate. The printed material is printed through the opening, and in order to achieve uniform printing quality or finished state and to improve printing accuracy, the viscosity of the printing paste at each printing is generally changed. However, when the printing paste is a solder paste and this is to be screen-printed on a printed circuit board, a solder paste having constant fluidity and viscosity suitable for printing should always be supplied. This promotes the miniaturization of printed circuit boards, and accordingly, the high density of screen plates having pattern openings of minute dimensions. In today led to printing is required, it is particularly important.

Among the solder pastes currently on the market as screen printing solder pastes for printed circuit boards, S
A low-melting solder alloy powder having a composition of about 63% nb and about 37% Pb and a high-viscosity liquid flux are kneaded to give a flux content of about 9.3%. Such a commercially available solder paste is sold in a syringe-shaped container or a bottomed short cylindrical container made of a synthetic resin.

[0005] By the way, such a solder paste is a substance having a property of having no fluidity in a stationary state and having a fluidity when stirred or vibrated, that is, a substance having a chixotropy property. It is difficult to use the product as it is taken out of the container for screen printing, and when used, it is necessary to impart fluidity and viscosity suitable for printing by stirring and kneading. However, in the conventional printing paste stirring / supplying device as described above, a single elongated rod-shaped rotating member is used as a stirring member, and a method in which this is directly connected to a motor is adopted. In the case of a solder paste having a viscosity, it takes a considerable amount of time to knead the paste to a state suitable for printing, and the load on the motor tends to be excessive, which tends to adversely affect the useful life of the apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and stirs and kneads a printing paste contained in a syringe with high efficiency to obtain fluidity and viscosity suitable for screen printing. A screen which can be sent out from a discharge port of the syringe in a state where the solder paste is applied, in particular, a screen which can be printed on a printed board through a pattern opening of the screen plate while supplying a solder paste onto the screen plate. SUMMARY OF THE INVENTION It is a main object of the present invention to provide an improved printing paste stirring / supplying device which is suitable for supplying a solder paste to a squeegee device of a printing press.

[0007]

In order to achieve the above-mentioned object, an apparatus for stirring and supplying a printing paste according to the present invention comprises:
A syringe unit made of a synthetic resin and a mixer unit detachably attached to a base end opening thereof, and configured to stir, knead, and extrude a printing paste stored in the syringe and to extrude from a discharge port of the syringe. A stirring and supply device for a printing paste, wherein the mixer unit includes:
A lid hermetically sealed to the proximal opening of the syringe,
A belt drive mechanism disposed on the lid body, and operatively connected to the drive mechanism via a transmission mechanism including a planetary gear mechanism extending within the syringe and rotating around a central axis thereof while rotating around the center axis of the syringe; And a plurality of stirring rods. For advantageous embodiments of the invention, reference is made to the respective claims.

[0008]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

The drawings show an example of an apparatus for stirring and supplying a printing paste according to the present invention, wherein A is a syringe formed of a synthetic resin such as polypropylene, and B is detachably attached to a base end opening A2 of the syringe A. And a mixer unit configured to stir and knead the printing paste 1 stored in the syringe and to extrude the paste from a discharge port A4 of the syringe. The syringe A has a cylindrical peripheral wall portion A1,
An outwardly protruding annular protruding edge A3 is formed at the base end opening A2.

The mixer unit B includes a lid 2 hermetically sealed at a base end opening A2 of the syringe A containing the paste 1, a belt driving mechanism B1 disposed on the lid,
A plurality of stirring rods B3 operatively connected to the belt driving mechanism B1 via a transmission mechanism B2 including a planetary gear mechanism so as to extend inside the syringe A and rotate around the central axis of the syringe while rotating. And In the example shown in the figure, the belt driving mechanism B1 has an upwardly protruding portion 3A of a tubular rotary shaft 3 that penetrates the lid 2 and protrudes vertically.
A large-sized driven wheel 4 having a knurl (not shown) engraved on its outer peripheral surface, a small motor 5 protruding from the horizontal projection 2A of the lid 2 and A small-sized motor vehicle 6 fixed to an output shaft 5A of the electric motor penetrating through the directional projection and projecting upward, and having a knurl 6A formed on an outer peripheral surface thereof; It comprises an endless belt 8 stretched between two tension wheels 7 between which the rotation of the small motor 5 is reduced and transmitted to the tubular rotary shaft 3.

The transmission mechanism B2 has a sun gear S loosely fitted on the outer periphery of the downwardly protruding portion 3B of the tubular rotary shaft 3 and fixed to the lower surface 2A of the lid 2 via an annular mounting plate 9. Is fixed to the downwardly protruding portion 3B of the tubular rotary shaft 3,
A substantially disk-shaped rotating body 10 vertically penetrating an air passage 10A communicating with the shaft hole 3C, and a plurality of rotating bodies that rotate around the sun gear S while rotating with the rotating body 10 And the upper end thereof is fixed to the planetary gear P, and the lower end thereof is inserted into each of a plurality of bearing holes 10B vertically penetrated respectively in the eccentric portions of the rotator 10, and It comprises a planetary gear shaft PA coaxially connected to the upper end of each of the plurality of stirring rods B3, and includes a planetary gear mechanism for causing each stirring rod B3 to perform planetary motion of revolving and discharging. In the figure, 9A is a joint pin for fixing the sun gear S to the lower surface of the mounting plate 9, 9B
Attaches the mounting plate 9 to which the sun gear S is fixed to the lid lower surface 2.
A screw to be screwed to A.

As shown in FIG. 3, the rotating body 10 is provided with an upper surface 10D surrounded by an annular peripheral wall portion 10C and boring the upper end of the bearing hole 10B as shown in FIG. A large-diameter circular recess 10B 'is formed in the upper surface 10D, and a boss P' integrated with the gear formed on the lower surface of the planetary gear P is rotatably accommodated in the circular recess 10B '. The top surface of the planetary gear P is set slightly lower than the top surface of the annular peripheral wall portion 10C. Reference numeral 10B "denotes a circular recess having a diameter larger than that of the bearing hole 10B similar to the circular recess 10B 'opening on the lower surface 10E of the rotating body 10. The circular recess 10B" includes a planetary gear shaft PA and a stirring rod. A tubular joint 11 for coaxially connecting B3 is rotatably accommodated. Thus, when a downward axial thrust acts on the stirring rod during rotation of the stirring rod B3, the bottom surface of the boss P 'of the planetary gear P comes into contact with the bottom surface of the circular recess 10B'. Downward displacement of the stirring rod is prevented. Conversely, when an upward thrust acts on the rod, the upper surface of the shaft coupling 11 comes into contact with the upper surface of the circular recess 10B ″. The upward displacement of the rod, and thus of the planetary gear P, is also prevented.

Reference numeral 12 denotes a disk-shaped pressing member which functions as a piston mounted on the stirring rod B3 so as to be slidable in the axial direction and rotatable integrally with the stirring rod. The pressure member 12 made of an elastic body such as rubber presses the paste 1 in the syringe A by pressing the paste 1 in the syringe by the air pressure of the compressed air supplied into the syringe from the base end opening A2 side of the syringe A. It is forcibly slid toward the side. Reference numeral B4 denotes a pipe joint for a compressed air supply pipe (not shown) connected to the shaft hole 3C of the upwardly protruding portion 3A of the tubular rotary shaft 3. In the example shown in the drawing, the pipe joint B4 is formed in a bend shape composed of two relatively rotatable pipe parts, and is formed on the pipe part B4A on the side connected to the shaft hole 3C. Is provided with a male screw B4A ', and this male screw B4A is
C is connected and fixed to the shaft hole 3C by being screwed into a female screw 3C 'engraved at the upper end of the pipe C, while the pipe portion B4B is connected to the compressed air supply pipe.
Is a tube portion B4 together with an integral curved portion B4B '.
A can be freely rotated around the axis of A. The above-mentioned disc-shaped pressing member 12 has a diameter substantially the same as the inner diameter of the cylindrical wall portion A1 of the syringe A, and is vertically moved in a state where its outer peripheral surface is in sliding contact with the inner peripheral surface of the peripheral wall portion A1. Be able to move to. The symbol B3 'represents each stirring rod B
A stirring member that revolves and rotates integrally with the rod provided in the vicinity of the distal end of the rod 3. In the example shown in FIG. 1, the stirring member B3 'is mounted horizontally at right angles to the axis of the rod. Consists of rod pieces.

Reference numeral 13 denotes an annular fitting portion that protrudes downwardly from the lower surface of the lid 2 and the lid 2 is located at the base opening A2 side of the syringe A in the annular fitting portion 13. It is to be worn. In the illustrated example, a screw 13 </ b> A is formed on the outer peripheral surface of the annular fitting portion 13 of the lid 2, and the above-described syringe is provided inside the annular fitting portion 13 on the lower surface of the lid. An annular gasket 14 is attached to the top surface of the outwardly protruding edge A3 of the base end 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 protruding edge A3. In the illustrated example, the attachment ring 16 is formed in a substantially U-shaped cross section, and a screw portion 16B capable of screwing with the screw 13A of the annular fitting portion is provided on the inner surface of the outer peripheral wall 16A. 13A.
Is screwed into the screw portion 16B, and the annular gasket 14 is pressed against the upper surface of the annular protruding edge A3 to thereby hermetically cover the lid 2 with the proximal opening A2 of the syringe. Have been able to. Reference numeral 17 denotes a syringe A
A screw (not shown) having a thread is screwed onto the thread 17 formed on the inner wall surface of the discharge port A4.
The ejection opening A4 can be opened and closed by removing it.

Reference numeral 18 denotes a synthetic resin protective cover which is detachably mounted on the cover 2 to prevent dust and the like from adhering to the belt drive mechanism B1 disposed on the cover 2. And to prevent fingers and the like from accidentally touching parts of the mechanism during operation. The rotating body 10, the sun gear S, the planetary gears P, and the like can also be formed by molding with synthetic resin. Synthetic resins as their molding materials are good in moldability, machinability, dimensional stability, abrasion resistance, heat resistance, self-lubricating property, etc., for example, acetal resin is suitable, and as a rotation transmission member As the molding material of the tubular rotary shaft 3, a high-strength material capable of sufficiently withstanding the mechanical load received when transmitting the rotational torque, for example, an engineering plastic such as a polyimide resin or a reinforced nylon resin is suitable. If the planetary gear P is formed of the synthetic resin as described above, the planetary gear P has its shaft PA
Can be easily and firmly fixed to the shaft PA simply by press-fitting, and the mounting work becomes extremely simple.
Further, the gears S and P made of synthetic resin as described above are not only lighter than metal gears such as brass, but also have the advantage that noise during meshing rotation can be significantly reduced. . When a small motor 5 having a rotational speed at a maximum efficiency of 5,200 to 13,000 rpm is used, for example, the belt driving mechanism B1
When the rotation speed of the paste can be reduced to about 1/3 to 1/5, the rotation power capable of effectively stirring and kneading the high-viscosity paste against the viscous resistance of the paste can be transmitted to the stirring rod B3. Has been found by experiment.

In the printing paste stirring / supplying apparatus constructed as described above, the mixer unit B is attached to the base opening A2 of the syringe A containing the printing paste 1 as shown in FIG. When started, the rotation is transmitted to the large-diameter driven vehicle 4 via the small-diameter driving wheel 6 and the endless belt 8 at a reduced speed, and the rotation of the driven wheel 4 is transmitted to the rotating body 10 via the tubular rotary shaft 3. Thus, the rotating body 10, that is, the plurality of stirring rods B3 and the pressing member 12 mounted on the rods are integrally driven to rotate about a vertical axis. In this case, each stirring rod B3 extending into the paste 1 in the syringe A
Is connected coaxially to the planetary gear shaft PA of each planetary gear P circumscribing the sun gear S, so that when the rotating body 10 is rotated, each planetary gear P meshes with the sun gear S accordingly. The stirring rods B3 rotate around them and impart a planetary motion to the stirring rods B3, so that the stirring rods B3 simultaneously perform the stirring operation of the paste 1 by the revolving motion and the stirring operation of the paste 1 by the rotation. Can be stirred and kneaded very efficiently to quickly impart fluidity and viscosity suitable for printing.

FIG. 4 is a schematic diagram showing the movement of the paste 1 caused by the rotation of the stirring rod B3 while revolving, and A1 'is the cylindrical wall A of the syringe A.
1, a cross section B3A is a cross section of the stirring rod B3, and O is a trajectory of the revolution of the stirring rod B3. In the figure,
When the stirring rod B3 revolves in the direction of arrow Y along the revolving locus O, if the rod B3 does not rotate,
The paste 1 is only pushed in the direction of arrow Y and turns along the revolving locus O. However, when it rotates, the paste 1 attached around the outer periphery of the paste 1 forms a vortex V that spreads spirally outward. It turns on the revolution locus O while forming. In this case, paste 1 is a solder paste,
The higher the viscosity, the larger the vortex V due to the stickiness, as a snowball. And, since the vortex V is generated continuously by the rotation of each stirring rod B3 while rotating along the revolution trajectory, the vortices V interfere with each other and mix with each other as shown in FIG. The disappearance due to interference and mixing is repeated, whereby the stirring and kneading of the paste 1 can be performed very efficiently in a short time.

Next, at the same time as the above-described stirring operation is performed on the stirring rod B3, the compressed air sent through the compressed air supply pipe connected to the pipe joint B4 is simultaneously supplied to the tubular rotary shaft 3.
When the air is blown into the syringe A through the shaft hole 3C and the air passage 10A communicating with the shaft hole, the disc-shaped pressing member 12 receives the air pressure of the compressed air from above and is forcibly slid downward so as to rotate. As a result, the paste is stirred by the pressing member 12 itself, and is stirred by the revolution and rotation of the stirring rod B3 under the pressurized state. The effect of stirring and kneading is further enhanced, and fluidity and viscosity suitable for printing are quickly provided. Then, as shown in FIG. 1, in the one provided with a stirring member B3 'that revolves while revolving integrally with the stirring rod near the tip of each stirring rod B3, the stirring area expands in the horizontal direction, and The vortex generated by the stirring becomes larger than that of the stirring rod B alone, so that the stirring efficiency is further improved.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is not limited to the embodiments, and various modifications may be made within the scope of the claims. Can be implemented with modifications. For example, although the illustrated apparatus is shown as having two stirring rods, the number may be three or four.

Since the present invention is configured as described above,
According to the present invention, the printing paste contained in the syringe can be extremely efficiently stirred and kneaded, and can be sent out from the discharge port of the syringe in a state where fluidity and viscosity suitable for screen printing have been imparted, Stirring and printing of printing pastes that can exhibit many benefits as described above
A supply device, particularly for supplying solder paste to a squeegee device of a screen printing machine configured to be able to print on a printed board through a pattern opening of the screen plate while supplying the solder paste onto the screen plate. Thus, a suitable printing paste stirring / supplying device can be obtained. In addition, the squeegee device embodying the present invention does not require a separate step or device for stirring and kneading the paste, because the present invention has the above-described effects.

[Brief description of the drawings]

FIG. 1 is a schematic vertical sectional side view showing an example of an embodiment of the device of the present invention.

FIG. 2 is an exploded perspective view showing a main part of a mixer unit of the present apparatus shown in FIG.

FIG. 3 is a perspective view of the syringe with a mounting ring mounted.

FIG. 4 is an explanatory view diagrammatically showing the movement of the paste caused by the rotation of the stirring rod while revolving.

[Explanation of symbols]

 Reference Signs List A syringe A2 base end opening A3 annular projection A4 discharge port B mixer unit B1 belt drive mechanism B2 transmission mechanism B3 stirring rod B4 pipe joint 1 printing paste 2 lid 2A horizontal projection 3 tubular rotating shaft 3A upward projection 3B Lower projecting portion 3C Shaft hole 4 Follower vehicle 5 Small motor 5A Output shaft 6 Driving wheel 7 Tensioner 8 Endless belt S Sun gear P Planetary gear PA Planetary gear shaft 10 Rotating body 12 Pressurizing member 13 Annular fitting portion 13A Screw 14 annular gasket 15 O-ring 16 mounting ring 16A outer peripheral wall 16B screw part

Claims (8)

[Claims] 1. A syringe made of a synthetic resin and a printing paste which is removably attached to a base end opening thereof, and is configured to stir, knead, and extrude a printing paste stored in the syringe from an outlet of the syringe. What is claimed is: 1. A printing paste stirring / supplying device comprising: a mixer unit, wherein the mixer unit has a lid hermetically sealed at a base end opening of the syringe, and a belt disposed on the lid. A drive mechanism, and a plurality of agitation rods operatively connected to the drive mechanism via a transmission mechanism including a planetary gear mechanism so as to extend within the syringe and revolve around its central axis while rotating. A stirring / supplying device for a printing paste. 2. A syringe made of a synthetic resin and a printing paste, which is detachably attached to a base end opening thereof, and is stirred and kneaded with a printing paste stored in the syringe, and is extruded from a discharge port of the syringe. What is claimed is: 1. A printing paste stirring / supplying device comprising: a mixer unit, wherein the mixer unit has a lid hermetically sealed at a base end opening of the syringe, and a belt disposed on the lid. A drive mechanism, and a plurality of agitation rods operatively connected to the drive mechanism via a transmission mechanism including a planetary gear mechanism so as to extend within the syringe and revolve around its central axis while rotating. A pressurizing member slidably mounted on the stirring rod and rotatably integral with the stirring rod; and compressed air supplied into the syringe from the base end opening side to thereby increase the pressure by the air pressure. Pressure part A pressurized air supply pipe fitting for forcibly sliding the material toward a discharge port side of the syringe; and a printing paste stirring / supplying device. 3. The printing paste stirring / supplying device according to claim 2, wherein the belt driving mechanism is fixed to an upwardly projecting portion of a tubular rotary shaft that penetrates the lid and projects vertically. , A small electric motor fixed to the lid, a small-diameter motor fixed to the output shaft of the motor, and an endless belt stretched between the motor and the driven vehicle. The transmission mechanism is loosely fitted to the outer periphery of the downwardly projecting portion of the tubular rotary shaft, and a sun gear fixed to the lower surface of the lid, and is fixed to the downwardly projecting portion of the tubular rotary shaft, and A rotating body vertically penetrating an air passage communicating with the shaft hole, a plurality of planetary gears rotating around the sun gear while meshing with the sun gear as the rotating body rotates, and an upper end portion of the planetary gear , And the lower end is located at the eccentric part of the rotating body. A planetary gear shaft respectively inserted into a plurality of bearing holes vertically penetrated and coaxially connected to upper ends of the plurality of stirring rods, respectively, and An agitating / supplying device for a printing paste, wherein a pipe fitting is connected to a shaft hole of an upwardly projecting portion of the tubular rotary shaft. 4. A syringe made of a synthetic resin and a printing paste which is removably attached to a base end opening thereof, and is configured to stir, knead, and extrude a printing paste stored in the syringe from an outlet of the syringe. What is claimed is: 1. A printing paste stirring / supplying device comprising: a mixer unit, wherein the mixer unit has a lid hermetically sealed at a base end opening of the syringe, and a belt disposed on the lid. A drive mechanism, and a plurality of agitation rods operatively connected to the drive mechanism via a transmission mechanism including a planetary gear mechanism so as to extend within the syringe and revolve around its central axis while rotating. A pressurizing member slidably mounted on the stirring rod and rotatably integral with the stirring rod; and compressed air supplied into the syringe from the base end opening side to thereby increase the pressure by the air pressure. Pressure part A pressurized air supply pipe fitting for forcibly sliding the material toward the discharge port side of the syringe, and a printing paste stirring / supplying device, wherein the belt drive mechanism includes A large-diameter driven vehicle fixed to an upwardly projecting portion of a tubular rotary shaft that penetrates and projects vertically,
A small motor that protrudes downward from the horizontal projection of the lid,
A small-diameter motor vehicle fixed to the output shaft of the electric motor penetrating through the horizontal protrusion and protruding upward, and one or a plurality of tension wheels between the motor vehicle and the driven vehicle A sun gear fixed to the lower surface of the lid, wherein the transmission mechanism is loosely fitted on an outer periphery of a downwardly projecting portion of the tubular rotary shaft, and the tubular rotary shaft A rotating body fixed to the downward projecting portion of the sun gear and vertically penetrating an air passage communicating with the shaft hole, and a plurality of rotating bodies that rotate around the sun gear while meshing with the sun gear with the rotation of the rotating body. A planetary gear, an upper end portion of which is fixed to the planetary gear, and a lower end portion of which is inserted into a plurality of bearing holes vertically penetrated respectively in the eccentric portion of the rotating body, and A planetary gear shaft coaxially connected to the upper end of the stirring rod It has lines cover, and stirred and the printing paste, characterized in that the fitting supply pipe is connected to the shaft hole of the upwardly projecting portion of the tubular rotary shaft
Feeding device. 5. The apparatus for agitating and supplying a printing paste according to claim 1, 2, 3, or 4, wherein a lower surface of an outwardly projecting annular projection formed at a base end opening of the syringe is provided. An O-ring is elastically contacted via a mounting ring fitted from the discharge port side, and an annular gasket capable of contacting the upper surface of the annular protruding edge is attached to the lower surface inside the annular fitting portion of the lid. The screw formed on the outer peripheral surface of the annular fitting portion of the lid is screwed into the 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 screw is formed on the upper surface of the annular protruding edge. A printing paste agitation / supply device, wherein the annular gasket is brought into pressure contact with the lid so that the lid can be airtightly fitted to a base end opening of the syringe. 6. The printing paste stirring / supplying device according to claim 1, further comprising a stirring member that rotates around the tip of each stirring rod while revolving integrally with the rod. An agitating / supplying device for a printing paste. 7. The printing paste stirring / supplying device according to claim 1, wherein a protective cover made of a synthetic resin for protecting a belt driving mechanism is provided on the lid. An agitating / supplying device for a printing paste, wherein the agitating device is attached. 8. The printing paste according to claim 1, wherein the printing paste is a creamy solder paste obtained by kneading a solder alloy powder and a high-viscosity liquid flux. A device for stirring and supplying paste.