JPH0784053B2 - Screen wiping device for screen mask in screen printing machine - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a screen mask back wiping device in a screen printing machine, and more specifically, when a resistive film or the like is formed on a ceramic substrate by screen printing at the time of manufacturing a chip resistor or the like, a paste attached to the screen mask or The present invention relates to a device devised so that dust in the air can be effectively wiped off without requiring manual work and the work can be automated.

[Prior art and its problems]

A unit electronic device such as a chip resistor adopted as a component of a hybrid electronic device is created by forming thick film elements on a ceramic substrate by screen printing. That is, first, V-groove slits are formed at equal intervals in the X and Y axis directions on the surface of a semi-dried ceramic substrate before sintering, and this is sintered in a furnace to form a ceramic with a lattice slit. Create the board. After that, a resistance pattern and an electrode pattern are formed on this substrate by screen printing to form a plurality of rows and columns of unit electronic devices on the substrate. In this case, at the time of screen printing, the print table supporting the substrate is moved to the lower side of the screen mask having the predetermined print pattern portion by the XY table, and the print pattern portion is overlapped with the predetermined position on the substrate. After that, the paste is applied to the surface of the screen mask to form a thick film element film on the substrate. By the way, since the print pattern portion of the screen mask has a fine mesh shape, the applied paste is not all placed on the substrate and a part of the paste remains on the screen mask, or dust in the air. And the like adhere to the screen mask, and as a result, the meshes of the screen mask are blocked, which often interferes with printing. Therefore, every time a predetermined number of substrates are printed, an operator wipes the screen mask with a waste cloth or the like at the appropriate time to prevent the clogging. However, as described above, since the mesh of the print pattern portion of the screen mask is quite small, it requires considerable skill to effectively wipe off the remaining paste or the like so as to eliminate the clogging of the screen mask. Cage,
It was an obstacle to promoting automation of work. In addition, since a large number of substrates are printed at the time of manufacturing, it is very disadvantageous in terms of productivity that the back wiping operation is manually performed. Therefore, there is a problem that the manufacturing cost rises. Therefore, conventionally, for example, a back wiping device for a screen mask disclosed in Japanese Utility Model Laid-Open No. 60-85931 has been proposed. In this conventional device, as shown in FIG. 5 and FIG. 6 of the publication, the solvent-impregnated cloth stored in the tank is fed out to the wiping roller, and the parts of these devices are The cloth is brought into sliding contact with the back surface of the screen mask by horizontally moving the whole body along the screen mask. According to such an apparatus, the back surface of the screen can be wiped off with the cloth soaked with the solvent. However, this conventional device is merely configured to wind the used cloth around the take-up roller each time the wiping work of the screen mask is completed, and the cloth is slid on the back surface of the screen mask. When it is, the feeding of the cloth is stopped. Therefore, although the dust and the like can be properly wiped off at the initial stage when the cloth is brought into sliding contact with the back surface of the screen mask, the cloth gradually becomes dirty after that, and the entire screen mask cannot be wiped uniformly and satisfactorily. It was Further, conventionally, in order to alleviate this difficulty, the cloth is impregnated with a solvent, but this solvent causes deterioration of the ink applied to the screen mask. Therefore, conventionally, there is a problem that the quality of printing is deteriorated due to the deterioration of the ink due to the use of the solvent. The present invention was devised under the circumstances as described above, and it is possible to remove the paste and dust in the air adhered to the screen mask by hand and without necessarily using a solvent or the like. It is an object of the present invention to perform the work uniformly and appropriately over the entire back surface of the screen mask.

[Means for solving the problem]

In order to solve the above problems, the present invention takes the following technical means. That is, the present invention provides a wiping material supply roller in which a plurality of strip-shaped wiping materials for wiping the back surface of a screen mask of a screen printing machine are wound in multiple layers, and a wiping material fed from the wiping material supply roller. Of the screen mask, and a wiping moving body having a wiping roller for contacting the back surface of the screen mask and a wiping material winding roller for winding the used wiping material that has passed through the wiping roller. Is a wiping posture in which a portion of the wiping material that contacts the outer peripheral surface of the wiping roller is brought into contact with the back surface of the screen mask of the screen printing machine to reciprocate along the screen mask, and the wiping material is placed on the back surface of the screen mask. It is provided so that it can be switched to the retracted position A back surface wiping device for a screen mask in a screen printing machine, wherein the wiping moving body has a wiping moving body in a wiping posture, and a portion of a wiping material which comes into contact with an outer peripheral surface of the wiping roller is a back surface of the screen mask. While reciprocating while making contact with, while applying tension to the wiping material at least for eliminating slack of the wiping material at a portion of the wiping material that comes into contact with the outer peripheral surface of the wiping roller, It is characterized in that a wiping material feeding means is provided, which sequentially feeds the wiping material from the wiping material supply roller to the wiping roller side.

[Action and effect]

In the screen mask back wiping device characterized by the above configuration, after the printing of the screen printing machine is completed,
It is possible to shift the wiping movable body from the retracted posture to the wiping posture, and bring the portion of the wiping material that contacts the outer peripheral surface of the wiping roller into contact with the back surface of the screen mask. Then, during the back wiping operation, the wiping material feeding means provided in the wiping moving body sequentially feeds the wiping material from the wiping material supply roller to the wiping roller side. Further, when the wiping material is fed out, tension is applied to the wiping material, and at least at the wiping roller portion, there is no slack. Therefore, a new part of the wiping material can always be brought into contact with the back surface of the screen mask without slack. As a result, unlike the conventional method, it is possible to avoid contact of the dirty portion of the wiping material with the screen mask, and the entire back surface of the screen mask can be properly and evenly formed without using a solvent. It has a special effect that it can be wiped off and clogging can be completely eliminated.

[Explanation of Examples]

An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows the entire back wiping device 1 in this example well, and FIG. 2 shows its usage. As can be seen from FIGS. 1 and 2, when the back wiping device 1 in this example prints a thick film element having a predetermined pattern on the electronic device substrate 3 as a printing target by the screen printing machine 2, It is for wiping off the paste as the printing paint remaining on the back surface of the screen mask 4 and the foreign matter D such as dust in the air that adheres. The substrate 3 is made of ceramic or the like, and in a semi-dried state before sintering, V-groove slits are formed on one surface at equal intervals in the X and Y axis directions by a blade and then passed through a furnace. It is composed by being sintered. Then, after the film thickness elements as the resistance pattern and the electrode pattern are formed on the substrate 3 by the screen printing machine 2, the portions of the substrate 3 surrounded by the lattice-like slits are respectively cut, and coating, trimming, etc. After the post-processing, a unit electronic device is created. On the other hand, the screen printing machine 2 has a screen mask 4
And a substrate transfer means 5 that transfers the substrate 3 to a corresponding position below the screen mask 4 and retracts it after printing. As can be seen from FIGS. 1 and 2, the screen mask 4 includes a frame member 6 and a screen member 7 supported by the frame member 6 and having a mesh-shaped print pattern portion. Then, at the time of printing, the first mask member S called a squeegee is moved forward on the screen member 7 of the screen mask 4 so that the paste is applied to the surface 7a of the screen member 7, After the retractor member S is retracted, the second retractor member S called a scraper is moved back on the screen member 7 so that the paste is further applied to the back surface side 7b of the screen member 7. It is designed to be penetrated. The substrate conveying means 5 conveys the printing table 8 carrying the substrate 3 and an XY table (not shown) which conveys the printing table 8 to the lower side of the screen mask 4 and retracts only the printing table 8 after printing. And a substrate collecting device 9 for carrying and discharging the substrate 3 after printing. As shown in FIG. 2, a plurality of dividing grooves 8a, 8a, 8b, 8b are formed at both ends of the printing table 8, and the substrate 3 has the dividing grooves at both ends thereof. 8a, 8a, 8b, 8b
While being placed on the printing table 8 so as to close the tip of the substrate, the substrate collecting device 9 is passed through the dividing grooves 8a, 8a, 8b, 8b from below the printing table 8 to carry the substrate 3. It has a plurality of possible claw portions 9a, 9a, 9b, 9b. That is, at the time of printing, the XY table is driven, and the printing table 8 carries the substrate 3 to the lower side of the screen mask 4, and then the substrate 3 is moved to the screen mask 4. The printing table 8 is raised so as to correspond to the screen member 7, and the substrate 3
Is held in the printing posture, printing is performed, and after printing, the XY table is driven again, and the printing table 8 is already below the split grooves 8a, 8a, 8b, 8b.
Is lowered to a position lower than the claw portions 9a, 9a, 9b, 9b of the substrate collecting device 9 standing by at the position corresponding to
Is carried by the claw portions 9a, 9a, 9b, 9b and is discharged. Then, the wiping device 1 is controlled by a drive control unit (not shown) to be driven in cooperation with the screen printing machine 2, and after the printed substrate 3 is retracted,
Proximity posture F approaching the screen mask 4
And a wiping movable body 10 that takes a wiping posture G that reciprocates under the screen mask 4 and a retracted posture H that is separated from the screen mask 4. That is, as shown in detail in FIG. 1, the wiping movable body 10 includes a support bed 11 and a movable support body 13 which moves on the support bed 11 in the X-axis direction and has an upper and lower cylinder 12. An oscillating body 14 oscillatably supported by the movable supporting body 13 is provided, which is interlocked with the substrate carrying means 5 and, after discharging the substrate 3, comes close to the screen mask 4 and is made of dust-free paper or the like. The back surface of the screen member 7 in the screen mask 4 through the belt-shaped wiping material 15
After sliding on 7b to remove the paste remaining thereon and foreign matter D such as dust in the air that has adhered thereto, it is evacuated. The support bed 11 extends to the lower side of the screen mask 4, while the movable support body 13 supports the swing body 14 by the drive control unit.
The drive is controlled so that it can be moved back and forth once. The moving support 13 is disposed at a position slightly displaced from the pivot shaft 13a in the X-axis direction, and is moved up and down by an up-and-down cylinder 12 driven by the drive controller in cooperation with the moving support 13. The swinging body 14 is swung in the direction indicated by the symbol P about the pivot shaft 13a. As can be seen clearly from the illustrated example, the oscillating body 14 includes a wiping material supply roller in which a plurality of wiping materials 15 are wound.
16, a wiping material winding roller 17 that winds up the wiping material 15, and a wiping material that is disposed at the tip of the oscillating body 14 and that is wound from the wiping material supply roller 16 to the wiping material winding roller 17. The middle part of 15 is hung,
The back surface of the screen member 7 through the wiping material 15
The wiping roller 18 that slides on 7b and the above-mentioned wiping material 15
Wipe material feeding means 19 for moving and stopping
And the wiping material supply roller 16 and the wiping material winding roller 17 are driven at the same time, and the wiping material 15
Tension maintaining motor 20 that can give a constant pulling force to
It has and. The wiping material supply roller 16 and the wiping material winding roller 17 are arranged at the rear end of the oscillating body 14, and the tension maintaining motor 20 is provided with a round belt 2 respectively.
It is connected via 1,22. Both rollers 17 and 20 are
A constant pulling force is applied to the wiping material 15, and the rotation directions of the wiping material 15 are opposite to each other so that the unwinding amount and the winding amount of the wiping material 15 are appropriate, and the number of rotations is set. The wiping material feeding means 19 includes a wiping material feeding motor 23 and a dual capstan type wiping material feeding roller 25, 2 connected to the motor 23 via a belt 24.
6 and a stopper member 27 that is pressed against the wiping material 15 to restrict its movement. As can be seen clearly from FIG. 1, the two feeding rollers 25 and 26 are configured so that the wiping material 15 can be moved by its rotational force while restraining a part of the wiping material 15 before being applied to the wiping roller 18 and a part of the wiping material 18 after being applied. It has become.
That is, the rollers 25 and 26 are the pressure rollers 28 and 29 that are pressed against them and the delivery motor 23, respectively.
In cooperation with the above, it plays a role of assisting the progress of the wiping material 15. In this case, the diameter of the delivery roller 25 is set to be larger than the diameter of the one roller 26, and even if the amount of the wiping material 15 wound on the wiping material winding roller 17 decreases due to the difference in the torque, Slack does not occur in the part that is fed out. A first tension roller 30 with a flange is provided between the wiping material feeding motor 23 and the wiping roller 18, and a second tension roller 30 is also provided between the wiping roller 18 and the wiping material winding roller 17. Tension roller 31
Is provided. Further, the stopper member 27 is provided in the vicinity of the first tension roller 30, and is driven in conjunction with the both pressing rollers 28, 29 to drive the both rollers 28, 29.
When 29 is in the separated position, press the
It is set so as to be in the separated posture when is in the crimping posture. Then, the wiping material feeding motor 23 is driven in cooperation with the moving support 13. That is, when the movable support 13 moves on the support bed 11 and comes to the lower side of the screen mask 4, the upper and lower cylinders 12 are driven and the oscillating body 14 oscillates in the arrow P direction, The wiping roller 18 through the wiping material 15
Is pressed against the back surface 7b of the screen member 7, and at the same time, the stopper member 27 is moved to the separated posture, while the pressing rollers 28 and 29 are changed to the pressed posture, and the wiping material feeding motor 23 is rotated to cause the wiping off. The material 15 is sent out. In this state, the moving support 13 is
After reciprocating on the upper surface for a predetermined distance, the upper and lower cylinders 12 are driven again and the oscillating body 14 oscillates.
After 18 is separated from the screen member back surface 7b,
While the stopper member 27 moves to the crimping posture, the pressing rollers 28 and 29 change to the separating posture so that the wiping material 15 can be stopped. The tension maintaining motor 20 is set to rotate during and after the series of operations described above. The back wiping device 1 is driven in cooperation with the screen printing machine 2.
The back wiping device 1 drives the lower side of the screen mask 4 once every time a predetermined number of substrates 3 are printed. The operation of the above configuration will be described with reference to FIGS. 1 and 2. First, as shown in FIG. 2, when a predetermined printing is performed on the number of substrates 3 set by the screen printing machine 2 as described above, the printing table 9 is retracted by the XY table, while The substrate 3 is discharged by the substrate collecting device 9. After that, as can be seen clearly from FIG. 1, the moving support 13 of the wiping moving body 10 in the retracted posture H shown by the alternate long and short dash line moves on the support bed 11 and is positioned below the screen mask 4. Then, the wiping moving body 10 takes the approaching posture F as shown by the chain double-dashed line in FIG. Next, the upper and lower cylinders 12 are driven, and the rocker 14
In the illustrated example swings in the direction of arrow P,
The wiping roller 18 is pressed against the back surface 7b of the screen member 7 via 15 and the wiping movable body 10 assumes the wiping posture G. At this time, the tension maintaining motor 20 is already rotating. At the same time, while the stopper member 27 is moved to the separated posture, the pressing rollers 28 and 29 are changed to the pressure-bonding posture, the wiping material feeding motor 23 is rotated, the wiping material 15 is fed, and the moving support 13 is moved. For example, one reciprocating movement is performed on the support bed 11. At this time, the wiping roller 18 moves the wiping material 15
Since it is pressure-bonded to the screen member back surface 7b via, the wiping material 15 will slide on the back surface 7b while being sent out, and as a result, the wiping material 15 remains on the screen member back surface 7b. The foreign matter D such as the applied paste and the attached dust in the air is scraped off. Moreover, the wiping material 15 is constantly fed so that a new surface is always formed on the back surface 7b of the screen member.
Be contacted with. Moreover, the tension maintaining motor 20 rotates to apply a constant pulling force to the wiping material 15, so that the wiping material 15 does not loosen and the wiping force is maintained constant. In particular, both the roller 26 and the pressure roller 29, and both the roller 25 and the pressure roller 28 sandwich both sides of the wiping material 15, and one roller 25 and the pressure roller 28 are sandwiched.
Both 28 and 28, in order to transfer the wiping material 15 to the wiping material take-up roller 17 side by the same dimension as the transfer dimension of the wiping material 15 sandwiched by the other roller 26 and the pressing roller 29, the portion of the wiping roller 18 In wiping material 15
Does not cause slack. Therefore, the wiping material 15
The new surface of the screen mask 4 can be appropriately brought into contact with the back surface 7b of the screen mask 4. Then, when the movable support 13 reciprocates once over the support bed 11 to complete a predetermined wiping operation, the upper and lower cylinders 12 are re-driven to swing the rocking body 14, and the wiping roller 18 is It is separated from the back surface 7b of the screen mask. Then, while the stopper member 27 moves to the crimping posture, the pressing rollers 28 and 29 change to the separating posture, and the wiping material 15 is stopped. At the same time, the both shaft members S, R on the screen printing machine 2 side are returned to their original movement start positions, and the screen printing machine 2 prepares the next printing posture. Since the tension maintaining motor 20 is still rotating after the series of operations described above, the wiping material 15 is
Is prevented from sagging. Furthermore, the series of operations described above is performed by the wiping material supply roller.
It is repeated until the wiping material 15 on the 16 is exhausted, but even if the number of windings of the wiping material 15 in the wiping material supply roller 16 is small, the feeding roller 25 on the winding roller 17 side is the supply roller. Since the torque is larger than that of the delivery roller 26 on the 16 side, the wiping material 15 fed out is not loosened. Of course, the scope of the present invention is not limited to the above-mentioned embodiment, and other modifications can be made. For example, the form of the wiping moving body 10 is not limited to the one shown in the drawing, and is designed so that it can effectively exhibit the wiping function. Further, the number of reciprocating movements of the wiping movable body 10 can be appropriately set according to the number of print processing of the screen printing machine 2, and how many times the substrate 3 is printed can be freely set. . Further, the moving distance can also be set corresponding to the size of the screen mask 4. The amount of the wiping material 15 delivered can be adjusted appropriately, and the material thereof is not specified.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, and FIG. 2 is an operation explanatory view. 1 ... Back wiping device, 2 ... Screen printer, 3 ... Printed material (substrate), 4 ... Screen mask, 7b ... Back side of screen mask, 10 ... Wiping moving body, 15 ... Wiping material , 16 ...... Wiping material supply roller, 17 ...... Wiping material winding roller, 18 ...... Wiping roller, 19 ...... Wiping material feeding means, F ...... Close position, G ...... Wiping position, H ...... Separation position.

Claims (1)

[Claims] 1. A wiping material supply roller on which a plurality of strip-shaped wiping materials for wiping the back surface of a screen mask of a screen printing machine are wound, and a wiping material fed from the wiping material supply roller is used for the screen printing machine. A wiping moving body having a wiping roller for contacting the back surface of the screen mask and a wiping material winding roller for winding the used wiping material that has passed through the wiping roller is provided. The wiping posture in which the portion of the wiping material that contacts the outer peripheral surface of the wiping roller is brought into contact with the back surface of the screen mask of the screen printing machine to reciprocate along the screen mask, and the wiping material is separated from the back surface of the screen mask. Screen mark that can be switched to the retracted posture A backside wiping device for a screen mask in a machine, wherein the wiping moving body is in a wiping posture, and a portion of the wiping material that contacts the outer peripheral surface of the wiping roller contacts the back surface of the screen mask. While performing reciprocating motion, while applying tension to the wiping material at least in the wiping material to eliminate slack in the wiping material in a portion of the wiping material that contacts the outer peripheral surface of the wiping roller, the wiping material A back wiping device for a screen mask in a screen printing machine, characterized in that a wiping material feeding means is provided for sequentially feeding out a new wiping material from a supply roller to the wiping roller side.