JPH06343913A - Paste kneading device - Google Patents

Abstract

PURPOSE:To provide a paste kneading device which is capable of kneading the paste stored in a paste container uniformly and adequately as a whole using a power. CONSTITUTION:A paste kneading device revolves around a reference rotating axis A. In addition, a paste container holder 16 which rotates is provided around the reference rotating axis A and an activated rotating axis B which is parallel with the former. Further, the paste container holder 16 has a paste container holding part 40 which holds a paste container 30 in which paste to be kneaded is stored. The paste container holding part 40 retains the paste container 30 in such a state that the center axis C of the paste container crosses the activated rotating axis B obliquely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paste kneading device.

[0002]

2. Description of the Related Art Generally, in manufacturing an electric circuit device using a printed circuit board, various semiconductor devices are mounted on the printed circuit board. For soldering for connecting the semiconductor device to a printed wiring part, Applying the solder paste to the surface of the printed circuit board is performed, for example, by a screen printing machine. However, since the solder paste, which usually contains a resin component and an activator component together with the solder particles, is unstable because the components are easily separated, it is necessary to sufficiently knead the solder paste immediately before supplying it to the printing machine. Is.

At present, most of the kneading of the solder paste is carried out by a worker on site. However, this kneading work is a very troublesome work for the operator, causes contamination of the human body or the surrounding environment, and it is difficult to obtain a constant kneading state in a stable manner. Alternatively, there is a problem that reliability is low.

[0004]

From the above viewpoint, it has been conventionally demanded to provide an apparatus capable of kneading a paste such as a solder paste by using power without the need of an operator. And several paste kneading devices have been proposed. For example, a paste kneading device that rotates a stirring propeller at a low speed in a container accommodating paste to be kneaded, or a rod-shaped stirring element that extends obliquely in the container is rotated in a swinging manner around a vertical axis. A paste kneading device has been proposed.
However, in these paste kneading devices,
Only the paste at a specific portion in the container receives the stirring force intensively, and the entire paste contained cannot be uniformly and sufficiently kneaded.

It is also possible to orbit the paste container about a vertical axis and rotate it about the axis of rotation, and to give a kneading action to the paste by utilizing the action of the centrifugal force by the revolution and the rotation. Only by doing, the movement of the paste in the container is fixed in a specific mode, and it is possible to expect a kneading action due to the rotational movement in the horizontal plane where centrifugal force is applied, but in other directions the container is There is a problem that the paste in the inside is hardly moved, and therefore a sufficient kneading state cannot be obtained.

The present invention solves the above problems,
It is an object of the present invention to provide a paste kneading device capable of uniformly and sufficiently kneading a paste contained in a paste container throughout the whole thereof by using power.

[0007]

A paste kneading apparatus according to the present invention has a paste container holder that revolves around a reference rotation axis and that rotates around an operating rotation axis parallel to the reference rotation axis. The paste container holder has a paste container holder that detachably holds the paste container containing the paste to be kneaded, and the paste container holder includes the paste container and a central axis of the paste container. Is held in a state in which it intersects with the operating rotary shaft at an angle.

Specifically, the paste kneading apparatus according to the present invention includes a machine frame, and the machine frame so as to rotate in a horizontal plane.
A revolving rotary member rotatably provided around a vertical reference rotary shaft, a drive motor for rotating the revolving rotary member, and an operating rotary shaft extending in the vertical direction at the revolving end of the revolving rotary member. A paste container holder provided rotatably around, and provided on this paste container holder,
The paste container holding section detachably holding the paste container holding the paste to be kneaded, and a planetary gear mechanism for rotating the paste container holding body around an operating rotation axis, and holding the paste container The section is for holding the paste container in a state where the central axis of the paste container intersects the operating rotation axis at an angle. A weight balancer is preferably provided on the revolution body for revolution.

[0009]

According to the above construction, the paste container is mounted on the paste container holder that revolves around the reference rotation axis and rotates about the operation rotation axis parallel to the reference rotation axis. The paste to be kneaded contained in the container undergoes a rotational movement in the plane of rotation due to the double centrifugal force caused by the revolution and rotation, and at the same time, the paste container has a central axis Since the paste container is held in a state where it obliquely intersects with the operating rotary shaft, the paste container rotates in a swinging manner around the operating rotary shaft, so to speak, and precesses. In the paste, the movement movement due to a large shake action occurs even in the vertical direction. As a result, the paste in the paste container can be uniformly and sufficiently kneaded throughout the paste.

[0010]

FIG. 1 is an explanatory sectional view showing the basic structure of a paste kneading apparatus according to an embodiment of the present invention. In the device according to this example, a drive motor 11 having a drive rotary shaft 10 extending vertically upward at the position of the reference rotary shaft A is provided.
Is fixed to a machine frame (not shown) and is provided at the upper end of the drive rotary shaft 10 so as to rotate in a horizontal plane.
The rotating bar 12 extending in the radial direction in the horizontal direction is provided with the nut 13
It is fixed by.

An operating rotary shaft B extending vertically is provided at the end portion (the right end portion in the drawing) which makes a circular motion by the rotation of the rotary bar 12.
An operating rotary shaft body 15 is rotatably provided around the operating rotary shaft body 15. The paste container holding base 16 is fixed to the upper end portion of the operating rotary shaft body 15 and the lower end portion of the operating rotary shaft body 15 is At the lower level of the rotary bar 12, an operating gear 17 having a gear surface on its outer periphery is fixed so as to rotate in a horizontal plane. In addition, a plurality of mounting holes H are formed at positions on the other end side of the rotary bar 12 at different distances from the reference rotation axis A. The balancer 19 is detachably attached.

On the other hand, a ring-shaped fixed gear 20 having a gear surface on the outer periphery is provided in the same horizontal plane as the operating gear 17 via a small annular gap with the outer peripheral surface of the drive rotary shaft 10 of the drive motor 11. It is fixedly installed on the machine frame so as to be located.

Further, the fixed gear 20 and the operating gear 1
An intermediate gear 24 having a gear surface on the outer circumference is provided between the intermediate gear 24 and the gear 7, and the intermediate gear 24 integrally formed at the center position of the intermediate gear 24 protrudes upward. The gear shaft 24A is rotatably supported at an intermediate position on a straight line connecting the reference rotary shaft A and the operating rotary shaft B in the rotary bar 12, whereby the fixed gear 20 serves as a sun gear and A planetary gear mechanism using the gear 24 and the operating gear 17 as planetary gears is configured.

The paste container holder 16 is provided with a paste container holder 40 for detachably holding the cylindrical paste container 30. This paste container holder 40
For example, one end of the paste container 30, in the illustrated example, one end where the small-diameter paste discharge part 31 is formed is in the lower position, and the central axis C of the paste container 31 is oblique to the operating rotation axis B. And the crossing position X is maintained in a state where the crossing position X exists in the paste container 30.

In the above, the paste container holding portion 40
Has, for example, a container receiving recess for receiving and holding one end of the paste container 30 in the above-mentioned state, and the paste container 30 is fixed in the container receiving recess by, for example, a screw. It is configured to do. However, the configuration of the paste container holding unit 40 is not particularly limited, and various configurations can be adopted according to the form of the paste container used. Also, the form of the paste container is not particularly limited.

The size of the angle θ formed by the central axis C of the paste container 30 and the operating rotation axis B is not particularly limited, and the kind of paste to be kneaded, the rotation speed of the rotary bar, and the paste. The axial length and radius of the container,
It can be set in an appropriate range according to the rotation speed of the paste container holder and other conditions,
The range of 0 degrees is preferable, and in the illustrated example, it is set to 45 degrees.

According to the paste kneading apparatus having the above structure,
The paste container 30 containing the paste to be kneaded is
When the drive motor 11 is mounted and held in the paste container holder 40 of the paste container holder 16 and the drive motor 11 is driven in this state, the drive rotary shaft 10 rotates and the rotary bar 12 fixed to the drive rotary shaft 10 lies in a horizontal plane. It rotates around the reference rotation axis A. The rotation of the rotary bar 12 becomes smooth and stable by selecting the position of the mounting hole H in which the weight balancer 19 is mounted.

When the rotary bar 12 is rotated, the intermediate gear shaft 24A rotatably supported by the rotary bar 12 revolves around the reference rotary shaft A. The outer circumference of the intermediate gear 24 included in the fixed gear 20 is meshed with the fixed gear 20.
While revolving around 0, it follows the fixed gear 20 to perform a planetary motion that rotates on its axis. As a result, the operating gear 17 is rotated via the intermediate gear 24, and the operating rotary shaft 1
5 rotates, and the operating rotary shaft body 15 is rotatably supported at one end of the rotary bar 12.
Paste container holder 16 fixed to the operating rotary shaft 15
Rotates while revolving around the reference rotation axis A while rotating around the operation rotation axis B.

Further, since the paste container 30 is held on the paste container holder 16 which moves in this manner, with the central axis C thereof crossing obliquely, the paste container 30 has a reference rotation axis A. While revolving around the periphery of the paste container 3 by the rotation of the paste container holder 16
A precession movement about the crossing position X between the central axis C of 0 and the operating rotation axis B is performed. That is, while the paste container 30 revolves around the reference rotation axis A, its central axis C has a conical shape with the operating rotation axis B as the rotation center, the intersection position X as the apex, and the apex angle of θ. Performs a swinging rotation motion so as to draw a locus along the peripheral surface of.

However, since the paste container 30 simultaneously performs such an orbital motion and a precession motion, the paste in the paste container 30 is simultaneously subjected to the centrifugal force due to the orbital motion and at the same time to the action due to the precession motion. It will be. As a result, the paste in the paste container 30 performs not only a double rotating motion in the horizontal direction but also a motion including a vertical component.

To facilitate understanding, for example, as shown in FIG. 2, a cylindrical paste container 51 having a flat circular bottom surface 50 will be described. Even when the centrifugal force F toward the right side of the drawing is applied, the posture of the bottom surface 50 of the paste container 51 with respect to the direction of gravity largely changes due to the difference in the rotational angle position due to the precession movement.

That is, as shown in FIG. 2A, when the upper part of the central axis C is tilted inward to approach the reference rotational axis A from the lower part by the precession movement, the paste in the paste container 30 is An inner vertical surface S facing the reference rotation axis A side is formed by P due to the centrifugal force F, and the bottom surface 50 at that time is inward in the revolution radius direction, that is, the direction of the reference rotation axis A (left in the figure). It is in a state of facing. On the other hand, FIG.
As shown in (b), when the upper part of the central axis C is tilted outward by the precession so as to be separated from the reference rotational axis A from the lower part, the paste P in the paste container 51 is
In the same way as described above, an inner vertical surface S facing the reference rotation axis A side is formed by the centrifugal force F, and the bottom surface 5 at that time is formed.
0 is a state in which it is directed outward in the orbital radial direction, that is, in the direction opposite to the reference rotation axis A (rightward in the drawing). in this way,
Since a state in which the inclined state of the bottom surface 50 changes is formed,
The paste P will move in the vertical direction,
As a result, it is understood that a sufficient kneading effect can be obtained even in the vertical direction.

In summary, in the paste kneading apparatus of the present invention, since the paste container 30 precesses while revolving, the paste in the container is subjected to horizontal centrifugal force due to revolving motion in the gravitational field. In addition, the shake motion due to the precession causes complicated movement, and as a result, sufficient kneading can be achieved very easily.

Moreover, since the above-mentioned kneading action acts on the entire paste in the paste container, the whole paste can be kneaded with extremely high uniformity, and the paste is locally kneaded. There is no such thing.

FIG. 3 is an explanatory view of a paste kneading apparatus having a structure which does not perform precession, which should be compared with the above case. In this apparatus, a rotary bar 62 extending in the horizontal direction is provided on a drive rotary shaft 60 of a drive motor 61, and an obliquely operating rotary shaft body 65 extending obliquely is provided at one end of the rotary bar 62, and the drive rotary shaft 62 is driven. Axis 6
Bevel gear 74 that meshes with the fixed bevel gear 70 fixed to the machine frame so as to be positioned with the outer peripheral surface of 0 through a minute annular gap.
And a tilt rotary shaft 75 parallel to the tilt working rotary shaft body 65 are provided. The tilt working rotary shaft body 65 and the tilt rotary shaft 75 have a belt 76 and pulleys 77 and 78.
Are connected via. And the paste container 51
Is provided on the paste container holding portion 66 at the tip of the tilt actuating rotary shaft 65.

In the apparatus of FIG. 3, since the posture of the bottom surface 50 of the paste container 51 is constant with respect to the centrifugal force F due to the revolution movement, the paste P slightly moves in the direction along the bottom surface 50. However, the movement of the paste P does not substantially occur in the other directions, and basically, the movement shown in FIG.
Since the state similar to that shown in 1) is maintained, the paste cannot be sufficiently kneaded.

In the operation of the paste kneading device of the present invention, the revolution speed of the revolution around the reference rotation axis A is, for example, 200 to 400 rpm, and the paste container holder 1
The rotation speed of 6 is 1/5 to 1 / the rotation speed of the revolution movement.
It is about 10.

FIG. 4 shows an example of a concrete structure of an automatic weight balancer device suitably used for the paste kneading device. In this example, the drive rotation shaft 1 of the drive motor 11
A reference bar 81 is fixedly provided at 0, and the rotary bar 12 extends in the same direction as the reference bar 81 at a level above the reference bar 81, and the rotary bar 12 is centered on the drive rotary shaft 10. Is provided so as to be swingable in such a manner that both side portions can move in the vertical direction and rotated by the drive rotation shaft 10.

Further, a DC motor 82 is fixedly provided at a substantially central portion of the rotary bar 12, and its drive shaft has one side (the left side in the drawing) of the rotary bar 12 in the longitudinal direction. A ball screw 83 extending in the direction is connected, and the weight balancer 85 is provided by being screwed with the ball screw 83 extending therethrough. A guide groove (not shown) extending in the lengthwise direction is formed in the rotary bar 12, and a guide pin 84 extending from the lower end of the weight balancer 85 is slidably engaged in the guide groove. By doing so, the weight balancer 85 can be moved.

Further, microswitches 86 and 87 are fixed to both ends of the rotary bar 12, respectively, and their operating contacts 86A and 87A project downward from the lower surface of the rotary bar 12 and pass through the minute gap to form the reference. It is in a state of facing the upper surface of the bar 81. Reference numeral 88 denotes a DC power source for the DC motor 82, such as the rotary bar 1
It is composed of a battery provided on the upper part 2.

FIG. 5 shows an example of an operation circuit of the automatic weight balancer device of FIG. As in this example, when the actuation contact 86A of the micro switch 86 on one side of the rotary bar 12 on which the weight balancer 85 is located is actuated, the weight balancer 85 rotates in the direction of movement toward the center. The DC motor 82 is driven, and conversely, when the actuating contact 87A of the micro switch 87 on the opposite side is actuated, the DC motor 8 is rotated so that the weight balancer 85 rotates in the outward direction.
2 is configured to be driven.

According to such an automatic weight balancer device, when the weight balance is poor in the paste kneading device and, for example, one side of the rotary bar 12 is lowered and tilted, the corresponding microswitch 86 is actuated. Contact 86A is activated. As a result, the DC motor 82
Is driven, and the weight balancer 85 moves toward the center, that is, the DC motor 82 until the balance state becomes appropriate.
Is moved in the direction of approaching. On the other hand, when the other side of the rotary bar 12 is inclined downward, the micro switch 87 drives the DC motor 82 in the opposite direction, and the weight balancer 85 is moved outward so that the balance state becomes proper. Therefore, by using the automatic weight balancer device having such a configuration, it is possible to automatically achieve the balance adjustment operation of the rotary bar that is the revolution body for revolution even during the operation of the paste kneading device, and thus always stabilize. Since the rotated state is secured, the reliability of the paste kneading device is improved.

According to the automatic weight balancer apparatus as described above, compared with the weight balancer 19 in the example of FIG.
Rotating bar 12 in a paste kneading device very suitably
However, due to the complicated rotation system of the paste kneading device, vibration may occur in the device and cause further resonance, in which case an unexpected accident may occur. is there. For this reason, it is preferable to provide a safety device for urgently stopping the operation of the paste kneading device when an extremely large vibration occurs.

FIG. 6 shows an example of a vibration detecting device which constitutes a safety device preferably used in a paste kneading device. This vibration detecting device has a cylindrical base 90 made of an insulating material and having an open lower end, and a metal member 91 fixedly provided so as to penetrate an upper wall of the base 90 is made of metal. The upper end of the coil spring 92 is fixed, and a rocking type weight contact 93 made of metal and supported by a metal column is suspended from the lower end of the coil spring 92. On the other hand, a cylindrical metal fixed contact 95 is fixedly provided at the lower end portion of the base 90, and surrounds the outer peripheral surface of the weight contact 93 through a space S of a predetermined size. It is said that. The metal member 91 and the fixed contact 95 are provided with detection ends 98 and 99, respectively, via an appropriate power source 96.

According to the vibration detecting device having such a structure,
The base 90 is provided by being fixed to an appropriate portion of the machine frame of the paste kneading device, for example. Then, when vibration occurs in the device, the base 90 vibrates along with the vibration, but since the weight contact 93 is suspended by the coil spring 92, the inertia is maintained so that the original position state is maintained. As a result, when the vibration becomes larger than a certain level, the weight contact 93
Comes into contact with the fixed contact 95.

Therefore, the metal member 9 is attached to the weight contact 93.
1, the detection end 98 is electrically connected via the coil spring 92, and the fixed contact 95 is electrically connected to the detection end 99. Therefore, the metal member 91 and the fixed contact 95 electrically connect the detection end 98. Switch is configured, and a detection signal due to the contact is obtained at the detection ends 98 and 99. Therefore, the drive signal 11 of the paste kneading device can be forcibly stopped by this detection signal, which can prevent an unexpected accident from occurring.

Although one embodiment of the present invention has been described above, various modifications can be made in the present invention. For example, as long as the paste container holder is configured to achieve the revolving motion and the precession motion of the paste container, a structure other than the planetary gear mechanism can be adopted. Further, when the planetary gear mechanism is used, various other gear configurations can be adopted, and it is not always necessary that the power source for the revolution movement and the precession movement be common. Furthermore,
Instead of the rotary bar, other revolving rotary bodies such as a rotary table can be provided, and a plurality of paste container holding bases can be provided.

[0038]

As described above, according to the paste kneading apparatus of the present invention, the paste kneading that allows the paste contained in the paste container to be uniformly and sufficiently kneaded over the whole by utilizing the power. It is possible to provide an apparatus, whereby it is easy to stably obtain a certain kneading state for the paste, and the kneading stability or reliability can be made high. In the present invention, it goes without saying that the type of paste is not particularly limited.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a basic configuration of a paste kneading device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining a kneading action that occurs in a paste according to an embodiment of the present invention.

FIG. 3 is an explanatory sectional view showing an example of a paste kneading device having a configuration to be compared.

FIG. 4 is an explanatory diagram showing an example of a specific configuration of an automatic weight balancer device suitably used for a paste kneading device.

5 is a circuit diagram showing an example of an operation circuit of the automatic weight balancer device of FIG.

FIG. 6 is an explanatory cross-sectional view showing an example of a vibration detection device that constitutes a safety device that is preferably used in a paste kneading device.

[Explanation of Codes] A reference rotary shaft 10 drive rotary shaft 11 drive motor 12 rotary bar 13 nut B operating rotary shaft 15 operating rotary shaft body 16 paste container holder 17 operating gear 19 weight balancer 20 fixed gear 24 intermediate gear 24A intermediate gear Axis 30 Paste container 40 Paste container holding part 31 Paste discharge part C Paste container central axis X Crossing position 50 Bottom surface 51 Paste container F Centrifugal force P Paste S Inner vertical surface 60 Drive rotation shaft 61 Drive motor 62 Rotation bar 65 Tilt operation rotation Shaft 66 Paste container holder 70 Fixed bevel gear 74 Bevel gear 75 Inclined rotary shaft 76 Belt 77, 78 Pulley H mounting hole 81 Reference bar 82 DC motor 83 Ball screw 84 Guide pin 85 Weight balancer 86, 87 Micro switch 86A, 87A Operation Contact point 88 DC power source 90 Base 91 Metal member 92 Coil spring 93 Weight contact point 95 Fixed contact point S space 96 Power source 98,99 Detection end

Claims (4)

[Claims] 1. A paste container holder that revolves around a reference rotation axis and rotates about an operating rotation axis parallel to the reference rotation axis, wherein the paste container holder is a paste to be kneaded. Has a paste container holding portion that detachably holds the paste container, and the paste container holding portion holds the paste container in a state in which the central axis of the paste container diagonally intersects the operation rotation axis. A paste kneading device characterized in that 2. A machine frame, a revolving rotary body rotatably provided on the machine frame around a vertical reference rotation axis so as to rotate in a horizontal plane, and a drive for rotating the revolving rotary body. A motor, a paste container holder rotatably provided around an operating rotary shaft extending in the vertical direction at the revolving end of the revolving rotor, and a paste to be kneaded provided on the paste container holder. The paste container holding portion that detachably holds the contained paste container, and a planetary gear mechanism that rotates the paste container holding body around an operating rotation axis, wherein the paste container holding portion is a paste container For holding the paste container in a state where the central axis of the paste container intersects the operating rotation axis at an angle. 3. A machine frame, a revolving rotary body rotatably provided on the machine frame around a vertical reference rotation axis so as to rotate in a horizontal plane, and a drive for rotating the revolving rotary body. A motor, a paste container holder rotatably provided around an operating rotary shaft at a revolving end of the revolution body, and a paste containing paste to be kneaded, which is provided in the paste container holder. A paste container holding part that holds the container detachably, and a planetary gear mechanism that rotates the paste container holding body around an operating rotation axis, and the revolution rotor has a radial direction of rotation thereof. In the paste kneading device, a displaceable weight balancer is provided. 4. A revolving rotary body is provided so as to be swingable, and a balance detection mechanism is provided for detecting the tilted state of the revolving rotary body. The paste kneading device according to claim 3, further comprising a moving mechanism that moves a weight balancer that is displaceable in a radial direction of rotation in a direction in which the inclined state is canceled.