JPH1095100A - Squeegee for screen process printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a squeegee for screen process printing whose effective length can be adjusted in a state that a squeegee rubber is fixed to a holder. SOLUTION: A squeegee 30 comprises an abutment position changing device formed of an attachment 36 attached to a holder 34 independently of a squeegee rubber 32 and abutted against a side face 70 at the back side in the scanning direction of the squeegee rubber 32 at an abutting position 62 parallel with a head end face 60, and a guide section 56 for changing the abutment position 62. The squeegee 30 is formed so as to restrain elastic deformation of the squeegee rubber 32 to the back side at the abutment position 62. Accordingly, the effective length of the squeegee 30 becomes a length L ranging from the abutment position 62 to which an abutment section 58 is to be abutted to the head end face 60. As the attachment 36 is fixed to the holder 34 independently of the squeegee rubber 32, the effective length L can be adjusted by changing the abutment position 62 to a desired position in a state that the squeegee rubber 32 is fixed to the holder 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a squeegee for screen printing.

[0002]

2. Description of the Related Art As one of printing methods for applying a printing paste in a predetermined pattern to a substrate such as a substrate, a printing screen having a predetermined pattern formed thereon is used for printing. 2. Description of the Related Art A screen printing method is known in which a paste is scanned in one direction by a squeegee to print a predetermined pattern on a surface of a printing medium disposed below the screen.

As shown in FIG. 1, for example, a squeegee 10 used in such a screen printing method is a flat (plate-shaped) squeegee rubber 12 made of urethane rubber or the like having a predetermined elasticity. Fixed to the holder 14. The holder 14 includes a pair of holder members 18a having a substantially L-shaped cross section and a holder member 18b having a substantially I-shaped cross section, each of which has a claw 16 at a distal end. When the squeegee rubber 12 is sandwiched between the pair of holder members 18a and 18b, the squeegee 10 tightens a plurality of bolts 20 provided at predetermined intervals in the longitudinal direction of the squeegee 10 perpendicular to the plane of the paper and holds the holder member 18b. Is fixed to the holder member 18a, whereby the squeegee rubber 12 is firmly held.

[0004]

In screen printing using the squeegee 10 as described above, the printing paste passes through the screen based on the pressing force applied to the screen from the squeegee 10 via the printing paste. Since the squeegee 10 is applied to the surface of the printing medium, printing conditions such as printing pressure may vary depending on the elasticity of the squeegee 10 and the shape of the tip. The elasticity of the squeegee 10 is determined by the thickness T and the amount of exposure from the holder 14, that is, the effective length L, in addition to physical properties such as rubber hardness determined by the material of the squeegee rubber 12. Therefore, in order to print under certain conditions, the effective length L
And the shape of the edge 22 and the end surface 24 of the squeegee rubber 12 must be maintained in a predetermined shape. Therefore, if the tip is worn while the squeegee 10 is repeatedly scanned, the shape of the tip is changed. Therefore, in order to keep the shape within an allowable range, the tip is polished as needed. The shape needs to be adjusted. This polishing process is performed, for example, by removing the squeegee 10 from the printing machine and sequentially polishing the end face 24 and the edge 22 with a belt sander, a rotary grindstone, or the like. Also,
If the effective length L is shortened due to the repetition of the polishing process, the squeegee rubber
In order to reduce the length H of the squeegee rubber 12 (that is, the holding length) and return the effective length L to the original value, the bolt 20 is temporarily loosened so that the exposed amount of the squeegee rubber 12 is reduced to the effective length L. It is necessary to re-tighten to a length that takes into account

However, in order to obtain a predetermined elasticity over the entire length of the squeegee 10 in the longitudinal direction, it is necessary to uniformly tighten bolts 20 provided at a plurality of positions in the longitudinal direction at predetermined intervals. Therefore, there is a problem that the polishing operation is complicated because the grip length H of the squeegee rubber 12 is adjusted as described above. Moreover,
During use of the squeegee 10, the squeegee rubber 12 is unevenly swollen by the solvent contained in the printing paste. Therefore, the bolt 2
When 0 is loosened, the strain caused by the uneven swelling state is released, and the squeegee rubber 12 warps as shown in FIG. 2, so that it is more difficult to obtain a uniform tightening state. . That is, during screen printing, the squeegee rubber 12 is elastically deformed rearward in the scanning direction by applying a predetermined printing pressure, and the plate tension received from the screen is uneven in the longitudinal direction perpendicular to the scanning direction. Thus, only one surface on the front side in the scanning direction is brought into contact with the printing paste. Since the swelling is caused by the solvent in such a deformed state, the swelling state becomes uneven and warpage occurs. This problem,
In particular, in the squeegee 10 for large area printing, the squeegee rubber 12 becomes long, which is remarkable.

Further, in the conventional squeegee 10, as described above, the grip length H is adjusted to be short in order to secure a predetermined effective length L after the squeegee rubber 12 is worn. Thus, the gap 26 is formed between the upper end of the squeegee rubber 12 and the holder 14. At this time, since the shape of the space formed between the holder members 18a and 18b is constant, the squeegee rubber 12 is initially held by the inner wall surface 28 and the claw 16 of the space with a sufficient holding force. When the polishing process is repeated and the squeegee rubber 12 is shortened, the area pressed by the inner wall surface 28 is reduced, and the squeegee rubber 12 is exclusively held by the claws 16. Therefore, the holding force is insufficient during printing when the squeegee 10 is pressed against the screen.
The squeegee rubber 12 pressed upward in the figure enters the holder 14 and cannot maintain the predetermined effective length L. Therefore, in order to maintain the effective length L, it is necessary to secure a large holding length H. Therefore, there is a problem that, of the entire length of the squeegee rubber 12, a length that does not function effectively becomes long. Moreover, since it is necessary to secure a large holding length H, if the solvent contained in the printing paste or the cleaning agent enters between the holder 14 and the squeegee rubber 12 by capillary action, it is difficult for the solvent to escape therefrom. There is also a problem that deterioration is more likely to occur.

Therefore, in consideration of the above circumstances, it is considered undesirable to change the grip length of the squeegee rubber in order to adjust the effective length of the squeegee. The present invention has been made based on such knowledge, and an object of the present invention is to provide a screen printing squeegee in which the effective length can be adjusted while the squeegee rubber is fixed to a holder.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to provide a squeegee rubber having a plate-like shape and a predetermined elasticity and holding the squeegee rubber at a base end side thereof. A screen for scanning the printing paste placed on the screen when screen printing is performed, using a tip end opposite to the base end side of the squeegee rubber in one direction. A printing squeegee, (a) a predetermined abutment which is attached to the holder independently of the squeegee rubber and is in contact with one surface of the squeegee rubber positioned on the rear side in the scanning direction and substantially parallel to the end surface on the tip end side. A squeegee rubber at the contact position, including a deformation suppressing member to be brought into contact at a position, and (b) a contact position changing device for changing a contact position of the deformation suppressing member. It is to suppress the elastic deformation of the rear side.

[0009]

With this configuration, the deformation suppressing member is attached to the holder independently of the squeegee rubber, and is brought into contact with one surface on the rear side in the scanning direction of the squeegee rubber at a predetermined contact position substantially parallel to the tip end surface. And a contact position changing device for changing the contact position of the deformation suppressing member, the screen printing squeegee is configured to suppress the rearward elastic deformation of the squeegee rubber at the contact position. You. Therefore, even during scanning in which the squeegee is pressed against the screen, the squeegee rubber suppresses elastic deformation to the rear side in the scanning direction at the contact position,
Only the portion on the tip end side from the contact position is exclusively elastically deformed. That is, the effective length of the squeegee is the length from the contact position where the deformation suppressing member is brought into contact to the tip end surface. At this time, the effective length can be adjusted by changing the contact position to a desired position by a contact position changing device, but since the deformation suppressing member is attached to the holder independently of the squeegee rubber, the squeegee rubber can be adjusted. The contact position can be changed in a state where is fixed to the holder. Therefore, the effective length can be adjusted while the squeegee rubber is fixed to the holder.

[0010]

Preferably, the screen printing squeegee is provided between the holder and the deformation suppressing member, and the tip of the squeegee rubber is provided to change the contact position. The apparatus further includes a guide device for guiding the deformation suppressing member on the holder in a state where the end surface on the side of the portion and the contact portion of the deformation suppressing member are kept parallel. With this arrangement, when adjusting the effective length by changing the contact position, the deformation suppressing member and the holder are kept in a state where the contact portion and the distal end surface of the squeegee rubber are kept parallel by the guide device. Are relatively moved. Therefore, a substantially constant effective length can be obtained over the entire length of the squeegee by simply moving the deformation suppressing member relative to the holder, so that the adjustment of the effective length is further facilitated.

Preferably, the contact portion of the deformation suppressing member has its contact position changed within a range including the vicinity of the tip of the squeegee rubber. If you do this,
The effective length of the squeegee can be made substantially zero by locating the contact portion near the tip of the squeegee rubber. Therefore, the deformation of the squeegee rubber when the squeegee is pressed from the front side in the scanning direction is suppressed,
When polishing the edge on the front side in the scanning direction for the purpose of making the tip of the squeegee have a predetermined shape, the run-out due to the elasticity of the squeegee rubber is suppressed, and the occurrence of uneven polishing is suppressed. Incidentally, when polishing the edge of the squeegee rubber, a belt sander, a rotary grindstone, or the like is usually used, but in the conventional squeegee, the squeegee rubber is restrained at all at a portion closer to the distal end than the base end fixed by the holder. It has not been. Therefore, the squeegee rubber is liable to vibrate based on the elasticity of the squeegee during the polishing process, and uneven polishing is likely to occur. This problem is remarkable because the longer the effective length of the squeegee rubber is, the more easily the deflection caused by the elasticity is generated. However, according to the above aspect, the more effective the squeegee rubber is during the polishing process by changing the contact position of the contact portion. Since the length can be shortened, run-out can be suppressed and uniform polishing can be performed.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following description,
The dimensional ratios and the like of each part are not necessarily drawn accurately.

FIG. 4 is a diagram showing a cross-sectional structure perpendicular to the longitudinal direction of a screen printing squeegee (hereinafter, simply referred to as a squeegee) 30 according to an embodiment of the present invention, and FIG. It is a figure showing the state attached to. In FIG. 4, a squeegee 30 includes a flat squeegee rubber 32 made of, for example, urethane rubber, a holder 34 for holding the squeegee rubber 32, and a squeegee length adjustment attachment (hereinafter, referred to as a squeegee attached to the side of the holder 34). 36 simply referred to as an attachment).

The holder 34 is made of, for example, an aluminum alloy or the like, and is fixed to one end located on the lower side in FIG. 4 in the longitudinal direction of the squeegee 30 so as to hold the base end 38 of the squeegee rubber 32 therebetween. A squeegee rubber fixing groove 40 extending along with the squeegee rubber fixing groove 42 shown in FIG.
Is provided with a mounting groove 44 extending along the longitudinal direction. The above-described squeegee rubber fixing groove 40 includes a pair of ridges 46, 46 which are formed to protrude inward at an intermediate portion in the depth direction over the entire length in the longitudinal direction of the squeegee 30, and have the same shape at the lower end. A pair of claws 48, 48 protruding inward over the entire length in the longitudinal direction. The squeegee rubber 32 has a base end portion 38 whose ridges 4
6 at a position corresponding to the ridge 46 at predetermined intervals from the side surface of the holder 34 at a position in contact with the lower surface of the bolt 6.
As a result, the inner wall surface of the squeegee rubber fixing groove 40 and the claws 48, 48 are firmly sandwiched and fixed.

The attachment 36 is made of, for example, an aluminum alloy or the like, like the holder 34, and has a substantially uniform thickness as a whole. As shown in FIG. A plate-like portion 52 extending in a substantially flat shape extending in the direction, and extending from the upper end surface of the plate-like portion 52 to the opposite side to the tip end portion 54 of the squeegee rubber 32 at three intermediate portions in the longitudinal direction. And a guide portion 56 having a rectangular parallelepiped shape as a whole. The above plate-like portion 52
Has a contact portion 58 formed by projecting toward the squeegee rubber 32 by bending the lower end portion over the entire length in the longitudinal direction. The tip of the contact portion 58 is shown in FIG. Of the one side surface 70 of the squeegee rubber 32 is separated from the end surface (tip surface) 60 of the tip portion 54 by a predetermined distance L and is in contact with a contact position 62 that is linear and parallel to the tip surface 60. Have been.

On the other hand, as shown in FIG. 5, the guide portion 56 has an elongated hole 64 formed so as to penetrate in the thickness direction over substantially the entire length in the longitudinal direction. The holder 3
4, a female screw hole 66 penetrating in the thickness direction is provided at a position corresponding to the guide portion 56, and the guide portion 56 is provided with an internal screw hole at an arbitrary position of the elongated hole 64. With a thumb screw 68 screwed into 66
The holder 34 is fixed in close contact with the right side surface in FIG. 4 opposite to the side surface where the bolt 50 is screwed. Therefore, the attachment 36 is attached to the holder 34 independently of the squeegee rubber 32. Further, as shown in FIG. 5, a part of the upper end side surface 72 located on the side of the mounting groove 44 located above the side surface on which the guide portion 56 of the holder 34 is in close contact is cut off. A guide groove 74 is provided by being chipped. The guide groove 74 is formed to have the same width as that of the guide portion 56 so that the guide portion 56 is fitted as shown in the figure.

For this reason, the attachment 36 is attached to the holder 34 and the holder 34 in the vertical direction perpendicular to the longitudinal direction of the squeegee 30 within the range in which the elongated hole 64 is formed with the thumb screw 68 loosened. The squeegee rubber 32 is moved relative to the fixed squeegee rubber 32, and is fixed by tightening the thumb screw 68 at a desired position. As a result, the contact position 62 at which the contact portion 58 makes contact is changed in a wide range from the vicinity of the base end portion 38 to the vicinity of the distal end portion 54, and the distance L from the distal end surface 60 is changed. At this time, the guide portion 56 provided with the elongated hole 64
Is moved up and down in a state of being fitted in the guide groove 74, so that the contact portion 58 and the distal end surface 60 of the squeegee rubber 32 are relatively moved while their parallel state is maintained. That is, in the present embodiment, the entire attachment 36 is composed of the holder 34 and the squeegee rubber 32.
The contact position 62 of the contact portion 58 is changed by being relatively moved with the thumb screw 68, and the guide portion 56, the long hole 64, and the female screw hole 6 are changed.
6 and the thumb screw 68 constitute a contact position changing device, and the guide portion 56 and the guide groove 74 constitute a guide device.

The squeegee 30 configured as described above is
As shown in FIG. 5, in a state where the mounting groove 44 is fitted from below the fixing bar 42, the squeegee fixing members 76 are fitted from both ends in the longitudinal direction to be fixed to the printing press. The squeegee fixing member 76 is provided at its lower end with a pair of claws 78, 78 to be engaged with the upper end of the holder 34, and has a fixing screw 80 screwed into the upper end face in the thickness direction. Not provided with female screw holes. Therefore, squeegee 3
0 is a fixing bar 4 between the claws 78 and the fixing screw 80 when the fixing screw 80 is screwed from the upper end surface.
2 and the holder 34 are fixed based on being pressed against each other. At this time, since the attachment 36 and the squeegee fixing member 76 do not interfere with each other as is apparent from the drawing, the thumb screw 68 is loosened and the attachment 36 The contact position 62 can be changed by moving up and down. In the figure, 82, 82
Is a solid bar support member provided in the printing press, and the squeegee 30 is scanned in the direction of arrow A in the figure while being supported by the fixed bar support members 82, 82. Therefore, the attachment 36 is attached to the holder 34 such that the contact portion 58 is brought into contact with the side surface 70 which is one surface of the squeegee rubber 32 located on the rear side in the scanning direction of the squeegee 30.
It will be attached to.

FIG. 6A is a schematic diagram showing a state in which screen printing is being performed by a printing machine equipped with a squeegee 30 as shown in FIG. Screen 8
The squeegee 30 supported on the screen 4 has a printing paste 86 on its screen 84 as the fixed bar supporting members 82, 82 are moved in the direction of arrow A in FIG.
Is scanned in the direction A, whereby a predetermined pattern is printed on the surface of the printing medium (not shown) positioned on the lower surface side of the screen 84. During the screen printing, as shown in the figure, the squeegee 30 is tilted forward by a predetermined angle φ with respect to the horizontal plane in the scanning direction, so that the squeegee 30 pushes the screen 84 downward toward the printing medium. The screen 84 is pressed by pressure. Therefore, as shown in FIG. 6A, the squeegee rubber 32, which is an elastic body, is elastically deformed toward the rear side in the scanning direction by the pressing force.

At this time, the side surface 70 of the squeegee rubber 32 on the rear side in the scanning direction is provided with a contact portion 62 of the attachment 36 at a contact position 62 separated from the distal end surface 60 by a predetermined distance L (length indicated by L ₁ in the drawing). The contact portion 58 prevents the contact position 62 from being deformed rearward because the contact portion 58 is in contact. That is, in the present embodiment, the attachment 36 corresponds to a deformation suppressing member that suppresses the elastic deformation of the squeegee rubber 32 rearward in the scanning direction. Therefore, only the lower portion of the squeegee rubber 32 below the contact position 62 is elastically deformed, and the length L of the lower portion is substantially the effective length of the squeegee 30, as described above. Since the contact position 62 can be changed, the effective length L of the squeegee 30 can be adjusted by changing the contact position 62.

In short, in this embodiment, the holder 3
4 is attached to the squeegee rubber 32 independently of the squeegee rubber 32.
36 having an abutment portion 58 that is abutted at an abutment position 62 parallel to the guide, a guide portion 56, an elongated hole 64, and a female screw constituting an abutment position changing device for changing the abutment position 62. The squeegee 30 is configured to include the hole 66 and the thumb screw 68 so as to suppress the elastic deformation of the squeegee rubber 32 rearward at the contact position 62.
For this reason, even during scanning in which the squeegee 30 is pressed against the screen 84, the squeegee rubber 32 suppresses elastic deformation toward the rear side in the scanning direction at the contact position 62, and thus the squeegee rubber 32 is larger than the contact position 62. Only the portion on the tip 54 side is exclusively elastically deformed. That is, the effective length of the squeegee 30 is the length L from the contact position 62 at which the contact portion 58 is brought into contact with the tip surface 60. At this time, the effective length L can be adjusted by changing the contact position 62 to a desired position. However, since the attachment 36 is attached to the holder 34 independently of the squeegee rubber 32, the squeegee rubber 32 is The contact position 62 can be changed in a state where the contact position 62 is fixed to the position. Therefore, the effective length L of the squeegee 30 can be adjusted while the squeegee rubber 32 is fixed to the holder 34.

Moreover, according to the present embodiment, the squeegee 30
Since the effective length L is determined only by changing the contact position 62 of the contact portion 58 of the attachment 36, the effective length L becomes a movable portion when the contact position 62 is changed as shown in FIG. Interference between the entire attachment 36 and the squeegee fixing member 76 for attaching the squeegee 30 to the printing press is avoided. For this reason, as shown in FIG.
Can be adjusted, and fine adjustment of printing conditions can be easily performed.

Incidentally, the squeegee 30 or the squeegee 10
When the squeegee 30 is attached to the printing press, the holder 34 (the holder 14 in the squeegee 10) is fixed to the squeegee fixing member 76 by a fixing screw 80 or the like as shown in FIG. Is
It is desirable to mount the squeegees 30 and 10 on a printing machine and perform trial printing. At this time, it is necessary to adjust the effective length L of the squeegees 30 and 10 which is one of the factors determining printing conditions. In some cases. At this time, in the conventional squeegee 10 as shown in FIG.
It is necessary to loosen the holder 14 in order to adjust the effective length L by changing the holding length H of 2, but since the holder 14 is fixed to the squeegee fixing member 76 as described above, When the squeegee 10 is fixed, it is difficult to loosen the holder 14. Therefore, in order to adjust the effective length L, the squeegee 10 must be removed from the printing press. When the squeegee 10 is attached after adjustment, it is necessary to set the degree of parallelism between the distal end surface 24 of the squeegee rubber 12 and the screen 84. Therefore, it is not easy to fine-tune the printing conditions.

According to the present embodiment, the squeegee 30
The effective length L is provided on the tip side of the attachment 36.
Is determined by the contact position 62 of the contact portion 58
Then, the tip of the holder 34 for fixing the squeegee rubber 32 is
Of the squeegee rubber 32 from the contact position 62 of the squeegee rubber 32
, As is apparent from FIG.
Distance from tip 54 of squeegee rubber 32 to holder 34
The exposed length E, which is the separation, is larger than the effective length L of the squeegee 30.
Be lengthened. Therefore, for example, for large area printing,
When the amount of the printing paste 86 placed before the key
Then, as shown in FIG.
The height P during scanning of the strike 86 is the effective length L ₁Longer than
In this case, the printing paste 86 is
Prevents contact with holder 34 in front of inspection direction
Is done. Therefore, the holder 34 and the squeegee rubber 32
Gap caused by the print paste 86 entering between
The swelling of the elastic rubber 32 is suppressed, and as shown in FIG.
Rotation of the printing paste 86 during scanning
It is possible to prevent the interference with the
Is obtained. In addition, it is provided at the tip of the attachment 36.
The contact portion 58 is higher than the mounting height P of the printing paste 86.
Although it is located on the lower side, its contact portion 58 is
The squeegee 30 runs on the rear side
The printing paste 86 positioned on the front side in the inspection direction is
It is unlikely that the contact portion 58 will be brought into contact with the contact portion 58.
You.

Incidentally, in the conventional squeegee 10, the effective length L is determined by the amount of exposure of the squeegee rubber 12 from the holder 14. Therefore, when the effective length L is shorter than the height of the placed printing paste 86, the printing paste 86 is brought into contact with the holder 14, and
2 swells easily and the printing paste 8 during scanning
6 can be impeded by the holder 14.

Further, according to this embodiment, the effective length L of the squeegee 30 is adjusted in a state where the squeegee rubber 32 is fixed to the holder 32, so that the relative positions of the holder 34 and the squeegee rubber 32 are changed at all. Therefore, unlike the conventional squeegee 10 shown in FIG.
Between the holder 14 and the base end of the squeegee rubber 12 caused by changing the grip length H for the purpose of adjusting
6 cannot occur. For this reason, since the gap between the squeegee rubber 32 and the holder 34 due to the formation of the gap 26 cannot occur, the holding length H (see FIG. 9) is sufficiently shorter than the length required when the gap 26 is formed. 4)
With this, the squeegee rubber 32 can be fixed. Therefore, since the effective length L can be changed over the entire movable range of the attachment 36, the squeegee rubber 32
Also, there is an advantage that the usable length with respect to the total length of the device becomes longer.

In this embodiment, the contact position 62
When the effective length L of the squeegee 30 is adjusted by changing the length of the squeegee 30, the attachment 36 and the holder are held in a state where the contact portion 58 and the distal end surface 60 of the squeegee rubber 32 are kept parallel by the guide portion 56 and the guide groove 74. 34 are relatively moved. Therefore, since the substantially constant effective length L is obtained over the entire length of the squeegee 30 by simply moving the attachment 36 relative to the holder 34, the adjustment of the effective length L is easier.

Further, in this embodiment, as described above, the contact portion 58 can change the contact position 62 within a range including the vicinity of the tip end portion 54 of the squeegee rubber 32.
The effective length L of the squeegee 30 can be made substantially zero by locating the contact portion 62 in the vicinity of the distal end portion 54. As a result, the deformation of the squeegee rubber 32 when the squeegee 30 is pressed from the front side in the scanning direction is further suppressed, and as shown in FIG.
When the edge 88 on the front side in the scanning direction is polished by the rotary grindstone 90 or the like for the purpose of making the shape of the squeeze 4 into a predetermined shape, the vibration due to the elasticity of the squeegee rubber 32 is suppressed, and the occurrence of uneven polishing is suppressed. On the other hand, in the conventional squeegee 10 as shown in FIG. 1, the exposed portion of the squeegee rubber 12 whose length L is closer to the distal end than the base end fixed by the holder 14 is not restricted at all. . Therefore, as shown in FIG. 7 (a), when the edge 22 is polished by pressing the polishing surface of the rotary grindstone 90 from an oblique direction, the squeegee rubber 12 vibrates based on its own elasticity during the polishing process. The uneven polishing of the edge 22 as shown in FIG. 7B is likely to occur.

When the effective length L of the squeegee 30, that is, the length of the squeegee rubber 32 that can be elastically deformed is increased, the amount of elastic deformation of the squeegee 30 increases when the pressing force on the screen 84 is constant. Therefore, even when the inclination angle φ of the squeegee 30 is constant as shown in FIGS. 6A and 6B, the effective squeegee angle θ is changed by changing the effective length L. It is possible to do. For example, in the figure, L ₁ <
When L _2, substantial squeegee angle, theta _1> from becoming a theta _2, without changing the setting of the inclination angle φ of the squeegee 30 of the printing machine, and can regulate squeegee angle theta. That is, according to the present embodiment, the squeegee 3
The change of the setting of the inclination angle φ of 0 can be replaced by the change of the effective length L.

FIG. 8 is a view showing a main part of an attachment 92 which can be attached to the holder 34 instead of the attachment 36 in the squeegee 30. The attachment 92 has a plate-like portion 52 having a shape similar to that of the above-described embodiment.
And a guide portion 56. At the upper end of the guide portion 56, a locking portion 94 is provided which extends to both sides along the longitudinal direction of the plate portion 52. Therefore, even when the thumb screw 68 is removed when the relative position between the attachment 92 and the holder 36 is changed, the locking portion 94 is engaged with the upper end surface 96 of the holder 34 shown by a dashed line in FIG. This prevents the attachment 92 from falling. Therefore, according to the present embodiment, the contact position 62 can be changed more easily.

While the embodiment of the present invention has been described in detail with reference to the drawings, the present invention can be embodied in still another embodiment.

For example, in the above embodiment, the contact position 62 of the contact portion 58 is changed by changing the attachment position of the attachment 36 to the holder 34. And a mechanism for changing the contact position 62 may be provided separately. That is, the attachment 36 may be constituted by a plurality of members, and only a part of the attachment 36 may be moved relative to the holder 34.

Further, in the embodiment, the guide device is constituted by the guide portion 56 for attaching the attachment 36 to the holder 34 and the guide groove 74 provided in the holder 34, but such a guide device is not necessarily required. It may not be provided. For example, the tip surface 6 of the squeegee rubber 32
If a high degree of parallelism between 0 and the contact portion 58 is not required, the setting of the degree of parallelism may be carried out visually. Even when a high degree of parallelism is required, the effective length L or the like may be reduced. The position may be set while actually measuring.

In the embodiment, the effective length L can be continuously adjusted by continuously changing the relative position between the long hole 64 and the female screw hole 66. When the allowable range is sufficiently large, the effective length L may be adjusted stepwise by providing round holes at a plurality of locations instead of the elongated holes 64.

In the embodiment, the tip of the contact portion 58 is positioned on the side surface 70 of the squeegee rubber 32 in a linear contact position 6.
Although the contact is made at 2, the tip of the contact portion 58 may be formed to have a large thickness so as to contact the side surface 70 with a predetermined width. In that case, the lower end position of the contact portion corresponds to the contact position 62.

Although not specifically exemplified, the present invention can be variously modified without departing from the spirit thereof.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross-sectional structure of a conventional squeegee.

FIG. 2 is a diagram illustrating a deformed state of a squeegee rubber removed from the squeegee of FIG. 1 after use.

FIG. 3 is a diagram illustrating a method of adjusting an effective length in the squeegee of FIG. 1;

FIG. 4 is a diagram showing a cross-sectional structure of a squeegee according to one embodiment of the present invention.

FIG. 5 is a perspective view showing a state in which the squeegee of FIG. 4 is attached to a printing press.

6 (a) and 6 (b) are diagrams for explaining a printing state of the squeegee of FIG. 4 and the like.

7A is a diagram illustrating a method of polishing the edge of the squeegee of FIG. 4, and FIG. 7B is a diagram illustrating a polishing state of the edge of the squeegee of FIG.

FIG. 8 is a view showing another example of an attachment that can be used for the squeegee of FIG. 4;

[Explanation of symbols]

30: squeegee 32: squeegee rubber 34: holder 36: squeegee length adjustment attachment (deformation suppression member) ｛56: guide portion, 64: elongated hole, 66: female screw hole, 68:
Thumbscrew｝ (contact position changing device) 58: contact portion 62: contact position 84: screen 86: print paste

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Susumu Sakamoto 2160 Yatsunami, Yasumachi, Asakura-gun, Fukuoka Prefecture

Claims (3)

[Claims] 1. A squeegee rubber having a plate-like shape and having a predetermined elasticity, and a holder for holding the squeegee rubber at a base end thereof, and a printing paste placed on a screen when screen printing is performed. A screen printing squeegee for scanning in one direction using a distal end of the squeegee rubber opposite to the base end, the squeegee rubber being attached to the holder independently of the squeegee rubber, A deformation suppressing member that is brought into contact with one surface of the squeegee rubber positioned on the rear side at a predetermined contact position substantially parallel to the end surface on the tip end side, and a contact for changing the contact position of the deformation suppressing member. A squeegee for screen printing, comprising: a position changing device; and suppressing elastic deformation of the squeegee rubber in a rearward direction at a corresponding contact position. 2. An end face of the squeegee rubber, which is provided between the holder and the deformation suppressing member and changes the abutment position, on a tip end side of the squeegee rubber and a contact portion of the deformation suppressing member are parallel to each other. 2. The squeegee for screen printing according to claim 1, further comprising a guide device for guiding said deformation suppressing member on said holder while being held. 3. The squeegee for screen printing according to claim 1, wherein said contact portion of said deformation suppressing member changes its contact position within a range including the vicinity of the tip of said squeegee rubber.