JPH08114257A - Arcuate movement mechanism - Google Patents

Abstract

PURPOSE: To enable arcuate movement having the large radius without enlarging the mechanism and degrading the accuracy. CONSTITUTION: This mechanism is provided with a moving body 2 provided with an arcuate surface 2a, support bodies 17A, 17B for supporting respectively both end sides of the arcuate surface 2a of the moving body 2 and a movable part for moving the support bodies 17A, 17B in relation to each other so that the arcuate surface 2a moves along a rotary movement locus having the center of the arc as the rotary center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arc motion mechanism used in, for example, a screen printing device.

[0002]

2. Description of the Related Art In the screen printing method, a print mask having a print pattern formed thereon is arranged on a print table on which a material to be printed is mounted, and then ink is dropped on the print mask.
Further, the ink on the print mask is spread by a squeegee and penetrated into the print pattern, so that the print pattern is transferred to the printing object.

In such a screen printing method,
It is necessary to hold down the print mask with a squeegee and then stretch it along its plane direction.
The print mask is deformed to distort the transfer pattern, and particularly with a fine print pattern, there is a disadvantage that printing cannot be performed accurately.

Therefore, in order to solve such inconvenience, recently, the printing table is formed in an arc shape, and the printing table is caused to roll around the arc center of rotation, thereby improving printing accuracy. Has been done. By rolling the printing table to make line contact with the printing mask, the extra force applied to the printing mask is reduced to prevent printing distortion.

FIG. 9 shows a mechanism for realizing the circular arc motion accompanied by such movement. This mechanism includes a sector block 50 having an arc surface 50a and a spindle 51 attached to the center of the arc, an arc motion mechanism 52 for rotating the sector block 50, and a moving mechanism 53 for repeatedly linearly moving the sector block 52. I have it. The arcuate movement mechanism 52 includes a drive shaft 55 having a drive gear 54 and a main shaft 5
1 and a passive gear 56 provided on the drive shaft 5
By transmitting the driving force of No. 5 to the main shaft 51 via the drive gear 54 and the passive gear 56, the fan-shaped block 50 is rotated and the circular arc surface 50a is circularly moved.

In this mechanism, the sector block 50 is rotated by an arc motion mechanism 52, and the sector block 50 is repeatedly linearly moved by a moving mechanism 53 in synchronism with the rotating motion of the arc block 50a. An arc motion accompanied by movement along the tangent line 57, that is, a pseudo rolling motion is performed.

[0007]

However, the mechanism constructed as described above has the following problems. That is, as the arc length of the arc surface 50a increases, the radius of the arc increases, and the fan block 50 itself and the arc motion mechanism 52 that rotationally drives the fan block 50 increase in size, as well as the moving mechanism 53 that moves these. There is also a problem that the size of the device also becomes large, which inevitably increases the size of the device. Furthermore, if the arcuate movement mechanism 52 and the movement mechanism 53 become large in size, it becomes difficult to maintain the driving accuracy thereof, and for this reason, a sufficient fan-shaped block 50.
However, there was a problem that the movement accuracy of the

Further, in order to move the circular arc surface 50a in a circular motion accompanied by movement, a plurality of mechanisms, that is, a circular motion mechanism 52 and a moving mechanism 53, are required, and there is a problem that the apparatus becomes larger.

Therefore, it is an object of the present invention to enable an arc motion having a large radius without causing an increase in size of the mechanism or deterioration of accuracy.

[0010]

In order to achieve such an object, an arcuate motion mechanism of a first invention of the present invention is a moving body having an arcuate surface, and both end sides of the arcuate surface of the moving body. And a moving part that moves the supports in association with each other so that the arc surface moves along a rotational movement locus with the arc center as the center of rotation. It is characterized by being

The arcuate motion mechanism according to the second aspect of the present invention includes a moving body having an arcuate surface, supports for supporting fulcrums located at both ends of the arcuate surface of the moving body, and the arcuate arc. It is characterized in that the surface is provided with a moving unit that moves the supports in association with each other so that the surface moves along a rolling locus about the center of the arc.

[0012]

According to the constitutions of the first and second aspects of the invention, the circular arc motion of the moving body is not carried out by turning around the circular arc center, but is supported by supporting both end sides of the circular arc surface. By moving the body in association with each other by the moving unit, the arc surface is moved along a locus of locomotion or a locus of rolling around the arc center. Therefore, the moving body does not need to have a size including the center of the arc, and can have a size only near the arc surface, and the movement stroke for moving the moving body can be minimized.

Further, in order to move the arcuate surface along the rolling motion locus, not only the arcuate motion mechanism but also a moving mechanism for horizontally moving the moving body in synchronization with the arcuate motion are required, and the size of the apparatus becomes large. There is a fear. However, in the second invention, the moving unit moves the supporting bodies in association with each other so that the circular arc surface moves along the rolling locus about the circular arc center as a rotation center. It is not necessary to provide a moving mechanism for horizontally moving.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a simplified diagram showing the structure of a screen printing apparatus having an arc motion mechanism according to an embodiment of the present invention.
In the figure, the left-right direction is the X-axis direction, while the up-down direction is the Y-axis direction.

In this screen printing apparatus 1, a printing table (corresponding to a moving body in the claims) 2 having a printing object mounting surface 2a which is an arc surface and a printing table 2 are moved in an arc along with movement. The moving unit 3 and the screen printing head 4 for performing screen printing on the printing material on the printing material mounting surface 2a are provided.

The moving portion 3 is provided with a pair of cam bases 7 provided on the rails 6 provided on the base 5 so as to be movable in the X-axis direction.
Equipped with A and 7B. Cam stand 7A located on the left side in the figure
An X-axis cam driving node 9 and a first Y-axis cam driving node 10A are coaxially attached to the shaft rotatably via a support portion 8. On the other hand, a second Y-axis cam driving node 10B is rotatably attached to the cam base 7B located on the right side in the drawing via a support portion 11. These cam drive parts 9, 10A, 10
B is composed of a flat plate cam, and a cam curve to be described later is formed on the peripheral surface thereof. Further, the cam base 7A is provided with an intermittent drive motor 13 including a stepping motor, etc., and the intermittent drive motor 13 and the X-axis cam driving node 9 are provided.
The timing belt 14 is stretched between the first Y-axis cam drive node 10A and the support shaft of the first Y-axis cam drive node 10A, and between the intermittent drive motor 13 and the second Y-axis cam drive node 10B. 13, each cam driving node 9, 10
A and 10B are designed to rotate. A tension roller 15 that applies tension to the timing belt 14 is provided on the cam table 7B. The tension roller 15 absorbs a change in the tension of the timing belt 14 due to a change in the separation distance between the cam bases 7A and 7B and gives a constant tension to the timing belt 14.

A support shaft 16 is provided on each of the cam bases 7A and 7B.
A and 16B are provided in an upright state, and support bodies 17A and 17B are supported by the support shafts 16A and 16B so as to be movable in the Y-axis direction. Each support 17
The first and second Y-axis cam followers 18 are provided at the lower ends of A and 17B.
A and 18B are provided. These Y-axis cam followers 1
Reference numerals 8A and 18B are composed of rotating rollers, and are in contact with the peripheral surfaces of the first and second Y-axis cam driving nodes 10A and 10B. In the moving unit 3, the movements of the first and second Y-axis cam driving joints 10A and 10B can be efficiently performed in the first and second movements.
Of each Y-axis cam follower 18A, 18B
Align the shaft cam followers 18A and 18B with each Y along the vertical direction.
The shaft cam driving nodes 10A and 10B are brought into contact with each other.

The upper ends of the supports 17A and 17B rotatably support fulcrums 19A and 19B provided at both ends of the printing table 2. The fulcrums 19A and 19B are provided along the concentric arc α of the printing material mounting surface 2a. Then, the cam base 7A,
7B is a support shaft 16A, 16B, a support 17A,
17B and the printing table 2, and the printing table 2 and the supports 17A and 17B are linked to each other by so-called link coupling. In addition, fulcrum 19A,
Alternatively, 19B may be provided on the printing material mounting surface 2a.

An X-axis cam follower 20 is provided on the base 5. The X-axis cam follower 20 is composed of a rotating roller supported by an L-shaped cam support 21 that is arranged so as to project upward from the base 5, and the X-axis cam follower 9 extends along the horizontal direction (X-axis direction). Is in contact with. The cam base 7A is elastically biased in the + X direction (right direction in the figure),
As a result, the X-axis cam driven node 9 is moved to the X-axis cam driven node 20.
It always comes into elastic contact with.

The screen print head 4 has a print mask 30 on which a print pattern is formed, an ink return member 31 that is moved to a print start position dropped on the print mask 30, and the ink on the print mask 30 penetrates into the print pattern. The squeegee 32 is provided and a plate frame 33 for holding the print mask 30 is provided.

In this screen printing apparatus 1, X
The X-axis cam mechanism 9 is composed of the shaft cam driving node 9 and the X-axis cam driven node 20, while the first and second Y-axis cam driving nodes 1 are formed.
0A, 10B and the first and second Y-axis cam followers 18A, 1
A Y-axis cam mechanism portion is constituted by 8B and 8B. Further, the X-axis cam mechanism section and the cam bases 7A and 7B constitute an X-axis moving section, while the Y-axis cam mechanism section and the support shaft 1 are provided.
A Y-axis moving unit is composed of 6A and 16B.

Next, details of the X-axis cam mechanism and the Y-axis cam mechanism will be described with reference to FIG. In this screen printing apparatus 1, the printing table 2 is moved so that the virtual circle β along the printing object mounting table 2a makes a pseudo rolling motion. Therefore, the fulcrums 19A and 19B are moved in the X-axis direction ( The fulcrums 19A and 19B are moved in association with each other and in the Y-axis direction (on the radial direction of the printing material mounting surface 2a, a direction orthogonal to the facing direction).

That is, as shown in FIG.
From the state where A and 19B are offset by θ1 and θ2, respectively, as shown in FIG. 3, the virtual circle β rotates counterclockwise in the figure by an angle θ about its center γ as a rotation center (the printing table 2 has an arc motion). In this case, the movement amount of each fulcrum 19A, 19B is represented by the following locus function.

[0024] That is, the fulcrum 19A _{is, X 1 = r2 {sin (} θ1 + θ) -sinθ1} ... Y 1 = r2 {cos (θ1 + θ) -cosθ1} ... Also, the fulcrum 19B _{is, X 2 = r2 {sin (} -θ2 + θ ) -Sin θ2} ... Y ₂ = r2 {cos (-θ2 + θ) -cos θ2}, where θ1, θ2 ≧ 0 X ₁ : The virtual circle β rotates counterclockwise about the center γ by the angle θ. In the case of fulcrum 19A on the X-axis Y ₁ : The amount of movement of fulcrum 19A on the Y-axis when the imaginary circle β rotates counterclockwise in the figure by an angle θ about its center γ as the center of rotation X ₂ : The amount of movement of the fulcrum 19B on the X axis when the imaginary circle β rotates counterclockwise in the figure about the center γ as the center of rotation γ Y ₂ : The imaginary circle β has its center γ as the center of rotation When rotating by an angle θ counterclockwise in the figure Amount of movement of the fulcrum 19B on the Y-axis r2: Distance between the center γ of the imaginary circle β (non-printed material mounting surface 2a) and the fulcrums 19A and 19B Therefore, to rotate the imaginary circle β , The fulcrums 19A and 19B are set to X so that the above equations are satisfied.
It may be moved by the axis moving unit and the Y-axis moving unit, and specifically, the fulcrum 19
The cam curves of the X-axis cam driving node 9 and the first and second Y-axis cam driving nodes 10A, 10B may be shaped so that A, 19B, that is, the supports 17A, 17B move.

In the case of this screen printing apparatus 1, as shown in FIG. 4, the non-printed material placing table 2a (imaginary circle β) is + X along the tangent line δ (corresponding to the lower surface of the printing mask 30) on the upper end side.
In this case, the rolling motion is performed in the direction (to the right in the figure). In this case, the movements of the fulcrums 19A and 19B are given by the following locus functions in which the horizontal movement elements are added to the movement functions of the above formulas. expressed.

[0026] That is, the fulcrum 19A _{is, X 3 = r1θ-r2 {} sin (θ1 + θ) -sinθ1} ... Y 3 = r2 {cos (θ1 + θ) -cosθ1} ... Also, the fulcrum 19B is, X ₄ = r1θ-r2 { sin (−θ2 + θ) −sin θ2} ... Y ₄ = r2 {cos (−θ2 + θ) −cos θ2} ... X ₃ : On the X axis of the fulcrum 19A when the virtual circle β rolls in the + X direction along the tangent δ. Amount of movement Y ₃ : The amount of movement of the fulcrum 19A on the Y axis when the virtual circle β rolls in the + X direction along the tangent line δ X ₄ : The virtual circle β rolls in the + X direction along the tangent line δ movement amount Y on X-axis of the fulcrum 19B in the case of _4: amount of movement on the Y axis of the fulcrum 19B of when the virtual circle beta has rolling movement in the + X direction along the tangential line [delta] r1: imaginary circle beta (non Radius r1θ of printed material placement surface 2a): Virtual circle β is tangent Rolling movement amount when rolling motion to the + X direction along, i.e., non-printed material carriage surface 2
As described above, in order to make the imaginary circle β roll along the tangent line δ in the + X direction, the fulcrums 19A and 19B are moved along the X axis so that the respective expressions of the above-mentioned movement functions are satisfied. Department and Y
It may be moved with the axis moving unit. Specifically,
The X-axis cam driving node 9 and the first and second Y-axis cam driving nodes 10A, 19B so that the fulcrums 19A, 19B, that is, the supports 17A, 17B move along the miracle function of
A cam curve of 10B may be formed.

In the screen printing apparatus 1, the support 17B and the cam base 7B are the same as the print base 2 and the support 1.
7A and 17B are linked to the support 17B and the cam base 7A by a link connection.
B is the movement of the fulcrum 19A in the X and Y axis directions, and the fulcrum 19
Following the movement of B in the Y-axis direction, the above-mentioned predetermined movement in the X-axis direction is automatically performed.
The structure is such that it is not necessary to provide a cam mechanism for guiding the movement of the fulcrum 19B in the X-axis direction.

Further, although the screen printing apparatus 1 is provided with a structure for rolling the print object mounting surface 2a, the fulcrums 19A and 19B are moved in the X-axis direction and the Y-axis direction, respectively. A mechanism for pseudo-rolling (rotating motion) of the printing material placement surface 2a is provided, and therefore, the movement stroke of the mechanism can be shortened to a necessary minimum, and therefore the mechanism can be downsized and necessary. Since the minimum motion stroke is sufficient, the motion accuracy can be easily increased.

Furthermore, the printing table 2 has fulcrums 19 at both ends.
It is configured to be supported by A and 19B, and it is not necessary to have a size including the center of the arc of the printing object mounting surface 2a even though the printing object mounting surface 2a is rotated. Therefore, the size of the printing table 2 is correspondingly reduced.

Next, a screen printing process by the screen printing apparatus 1 will be described. Here, a case will be described in which an electrode pattern is screen-printed on a green sheet that is a material for a circuit board or the like. Therefore, the print mask 3
A print pattern corresponding to the electrode pattern is preliminarily formed at 0.

First, the printing table 2 is lowered to lower the printing mask 3.
The green sheet G is set on the printing object mounting surface 2a of the printing table 2 in this state while being separated from 0. further,
The green sheet G is fixed to the printing material mounting surface 2a by suctioning with a suction device (not shown) provided on the printing table. Further, the ink paste P is dropped on the print mask 30. (See FIG. 5) Then, the printing table 2 is raised by an elevating mechanism (not shown) until one point on the green sheet G comes into contact with the printing mask 30, while the ink return 31 is lowered to the printing mask 30 and further the ink return 31 is performed. The ink paste P is moved to the print start position (the left end in the drawing of the print mask 30) by sliding the print mask 30 along the print mask 30. (See FIG. 6) In this state, the ink return 31 is raised, and instead, the squeegee 32 is lowered to the print mask 30, and the squeegee 32 is pressed against the print mask 30 to some extent, and then the print mask 30 is moved along the print mask 30. And slide it. This causes the ink paste P to penetrate into the print pattern. At this time, simultaneously, the X-axis moving unit and the Y-axis moving unit are driven to move the printing table 2. This movement is performed by moving the supports 17A and 17B in the X-axis direction and the Y-axis direction so that the print mounting surface 2a makes a rolling movement with the lower surface of the print mask 30 as the rolling surface. At this time, it is conceivable that the cam bases 7A and 7B move along the X-axis direction while changing the distance between the cam bases 7A and 7B, which causes the tension of the timing belt 14 to fluctuate. As it is absorbed by the tension roller 15,
The timing belt 14 is constantly applied with a constant tension, and there is no inconvenience.

Further, by performing such movement of the printing table 2 in synchronization with the sliding movement of the squeegee 32, the printing table 2
The print mask abutting position of is set to the same position as the print mask abutting position of the squeegee 32, or a position in the vicinity thereof. As a result, the print mask 30 is sandwiched between the squeegee 32 and the printing table 2, so that the ink paste P that has penetrated into the print pattern is transferred onto the green sheet G. (See FIG. 7) At this time, although the print mask 30 is sandwiched between the squeegee 32 and the printing table 2 for printing, the printing material placement surface 2a is rolling along the print mask 30,
Almost no stress is applied to the print mask 30 by the squeegee 32 and the printing table 2 during the sandwiching operation. Therefore, the print mask 30 is not deformed, and highly accurate screen printing can be performed.

When the above printing process is completed, the printing table 2
Is lowered by an elevator mechanism (not shown), and the print mask 3
Separate from 0. This completes one step of screen printing. (See FIG. 8) In the above description, it is explained that the raising and lowering operation of the printing table 2 is performed by the raising and lowering mechanism (not shown), but the ends of the cam curves of the first and second Y-axis cam driving joints 10A and 10B. If a cam curve corresponding to the elevation of the printing table 2 is formed in the section, the printing table 2 can be raised and lowered by the Y-axis cam mechanism section, and it is not necessary to provide a separate lifting mechanism.

Further, although the circular arc motion mechanism of this embodiment has a structure in which the circular arc surface rolls, the circular arc motion mechanism also includes a mechanism for rotational motion with the center of the circular arc surface as the center of rotation. It goes without saying that there is.

Further, in the present embodiment, the moving part 3 has the cam mechanism, but the present invention is not limited to such a structure and has a ball screw, a rack and pinion, or the like. Good.

Furthermore, in the present embodiment, an example in which the arcuate movement mechanism of the present invention is incorporated in the screen printing apparatus has been described, but the present invention is not limited to this and other printing apparatuses can be used. Needless to say, it can also be incorporated into various devices.

[0037]

As described above, according to the first and second aspects of the present invention, the circular arc motion of the moving body is not performed by the rotation around the circular arc center, but the circular arc surface By moving the support bodies that support the both end sides in association with each other by the moving unit, the arc surface is moved along the rotational movement locus or rolling movement locus with the arc center as the rotation center. Therefore, it is not necessary to make the size of the moving body including the center of the arc, and it is possible to make the size only in the vicinity of the arc surface, and the movement stroke for moving the moving body is also the minimum necessary. It was Therefore, it is possible to reduce the size of the mechanism and to control the minimum necessary motion stroke, so that the accuracy of the motion can be easily increased.

Further, in order to move the arcuate surface along the rolling motion locus, not only the arcuate motion mechanism but also a moving mechanism for horizontally moving the moving body in synchronism with the arcuate motion are required, and the apparatus becomes large in size. There is a fear. However, in the second invention, the moving unit moves the supporting bodies in association with each other so that the circular arc surface moves along the rolling motion locus with the center of the circular arc as the center of rotation. It is not necessary to provide a moving mechanism for moving horizontally, and there is an effect that the size of the mechanism can be further reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a screen printing apparatus incorporating an arc motion mechanism according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining the movement of the printing table.

FIG. 3 is a diagram for explaining an arc motion of a printing table.

FIG. 4 is a diagram for explaining an arc motion (rolling motion) accompanying movement of a printing table.

FIG. 5 is a diagram showing a first printing process of the screen printing apparatus according to the present embodiment.

FIG. 6 is a diagram showing a second printing step of the screen printing apparatus according to the present embodiment.

FIG. 7 is a diagram showing a third step of the printing steps of the screen printing apparatus of this embodiment.

FIG. 8 is a diagram showing a fourth step of the printing steps of the screen printing apparatus according to the present embodiment.

FIG. 9 is a diagram showing a configuration of a conventional arc motion mechanism.

[Explanation of symbols]

 2 Printing table 2a Printed object mounting surface 3 Moving part 9 X-axis cam driving node 10A 1st Y-axis cam driving node 10B 2nd Y-axis cam driving node 17A Support 17B Support 18A 1st Y-axis cam driven node 18B 2nd Y-axis cam Follower 19A Support 19B Support 20 X-axis cam follower α Concentric arc β Virtual circle γ Virtual circle center δ Tangent

Claims (5)

[Claims] 1. A moving body having an arcuate surface, a support body for supporting both end sides of the arcuate surface of the moving body, and the arcuate surface moving along a rotational movement locus about the arc center of rotation. As described above, the moving mechanism moves the supporting bodies in association with each other. 2. A moving body having an arcuate surface, supports for supporting fulcrums located on both ends of the arcuate surface of the moving body, and a rolling motion locus of the arcuate surface with its arc center as the center of rotation. And a moving unit that moves the supports in association with each other so as to move along the arc motion mechanism. 3. The support body supports at least two points on the arc surface, or at least two points on a moving body located on a concentric arc of the arc surface. Alternatively, the arcuate movement mechanism according to claim 2. 4. The moving unit comprises:
2. An X-axis moving unit that moves along the facing direction of each other, and a Y-axis moving unit that moves each of the supports along a direction orthogonal to the facing direction. The arcuate movement mechanism according to claim 2 or 3. 5. The X-axis moving section has an X-axis cam mechanism section, and the X-axis cam mechanism section abuts against the X-axis cam follower section and the X-axis cam follower section. And an X-axis cam driven joint for relatively moving the cam driven joint in the facing direction, and one of the X-axis cam driven joint and the X-axis cam driven joint cannot be relatively moved in the facing direction with respect to the support body. And the Y-axis moving section has a Y-axis cam mechanism section provided on each of the supports, and the Y-axis cam mechanism section includes a Y-axis cam follower and the Y-axis cam. And a Y-axis cam follower that abuts on the follower and relatively moves the Y-axis cam follower along the orthogonal direction, and one of the Y-axis cam follower and the Y-axis cam follower is described above. It is characterized in that it is connected to a support so as not to move relative to the orthogonal direction. Arcuate movement mechanism Motomeko 4 wherein.