JPH08281921A - Cleaning method and cleaning apparatus in screen printing - Google Patents

Abstract

PURPOSE: To provide a cleaning method and a cleaning apparatus for removing scum of ink or the like remaining on a rear face of a screen after printing and deteriorating the printing quality afterwards. CONSTITUTION: The apparatus includes housings 18, 20 which can advance/ retreat to a screen S where an ink or solder paste, etc., remains after printing and can move also in a horizontal direction, one or a plurality of thin plates of cleaning blades 12a, 12b, 12c supported detachably to the housings 18, 20 and elastically connectable with the screen S, and a cleaning fabric paper 14 disposed between the screen S and cleaning blades 12a, 12b. Moreover, the apparatus comprises mechanisms 22, 24, 26, 28, 30, 36 for drawing out and taking up the cleaning fabric cloth 14, and a piping mechanism for discharging a solvent remaining in the cleaning fabric paper 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a screen used for screen printing or thick film coating printing, such as mounting a solder paste at a predetermined position before mounting electronic components on an electronic circuit board. A cleaning method and an apparatus therefor.

[0002]

2. Description of the Related Art It is well known that screen printing is used as a method for printing an electronic circuit pattern on an insulating substrate. In this screen printing method, a screen (or a mesh screen) placed on an insulating substrate to be printed, and running on the screen to supply a predetermined amount of ink to the screen and press the screen against the insulating substrate. Composed of ink squeegee. As a result, a predetermined electronic circuit pattern made of ink is printed on the insulating substrate, and the electronic circuit pattern is formed by the printing through holes formed in the screen. The printed insulating substrate is heated away from the screen to fix the printed electronic circuit pattern. The screen is made of stainless steel mesh or the like.

In order to improve the quality of the printed pattern on the insulating substrate, it is necessary to clean the screen at regular time intervals. A cleaning method for that purpose is provided. For example, it is a method of spraying a solvent such as ink on the back surface of the screen after printing to remove the ink or the like. In addition, it is a system in which the circumferential surface of the roll paper is pressed against the back surface of the screen to wipe off ink and the like (wiping).

[0004]

However, each of the conventional examples for cleaning the back surface of the screen has advantages and disadvantages. For example, in the first example, the sprayed / applied solvent enters the pattern of the screen, which causes a defect due to the separation of the first plate after cleaning by flux cleaning, which prevents continuous printing and causes the plate separation of the screen plate. Inhibit. In the second one, the solvent and traces of oils in the printing material are relatively easy to remove,
Small solder particles and the like as solid matter tend to remain.

The present invention has been made in view of the above problems, and provides a cleaning method and an apparatus thereof in which the disadvantages of the conventional example are eliminated without reducing the advantages thereof.

[0006]

A cleaning method in screen printing according to the present invention is a screen printing method in which a screen that has finished printing is reused for subsequent printing. It is characterized in that the residue such as ink or solder paste remaining on the screen is removed by elastically contacting and moving the screen or the cleaning blade.

Further, in this method, a cleaning cloth for wiping off the residue is interposed between the screen and the cleaning blade, or the solvent of the residue is soaked in the cleaning cloth, or the cleaning cloth is rolled. It is characterized in that it can be fed out and wound up intermittently.

Further, the cleaning device for screen printing according to the present invention includes a support which can be moved back and forth and moved horizontally toward the screen which has completed printing and has a residue such as ink or solder paste, and the support. And a cleaning blade made of one or a plurality of thin plates that are detachably supported and can be elastically contacted with the front surface or the back surface of the screen.

Further, in this apparatus, a cleaning cloth paper is interposed between a part or all of the cleaning blade and the screen, or a drive mechanism for feeding and winding the cleaning cloth paper is provided, or A mechanism for discharging the residual solvent to the cleaning cloth is provided, and further, the cleaning cloth is intermittently fed out in association with the movement of the support body that moves back and forth toward the screen,
Also, a structure is provided in which a mechanism for winding up is provided and the cleaning blade is fixed to the blade holder with two thin steel plates with a predetermined gap, or the residual solvent is put between the two thin steel plates. A feature is that a pipe for discharging is provided.

With this configuration, the residue on the front or back surface of the screen is scraped off by the cleaning blade, wiped off by the cleaning paper, or dissolved by the solvent and wiped off by the cleaning paper.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the cleaning device 10A is arranged below the screen S for screen printing. That is, after the predetermined circuit pattern is printed on the insulating substrate or the like, the printed insulating substrate or the like moves from the printing unit and the cleaning device 1
0A is raised to the actuated position as shown. In this operating position, the first to third cleaning blades 12a,
The tops of 12b and 12c are the back surface (bottom surface) of the screen S.
Bullet contact with. First and second cleaning blades 12a, 1
The cleaning cloth paper 14 moistened with the solvent is placed on the top of 2b, but the cleaning cloth paper 14 is not placed on the third cleaning blade 12c. Cleaning blade 12a,
Each of 12b and 12c is made of a thin steel plate, but may be a thin plate of carbon or resin.

The cleaning device 10A is moved to the front and rear (horizontal direction in the drawing) in the horizontal direction by a slider (not shown) (see reference numeral 100 in FIG. 5), whereby the tops of the cleaning blades 12a, 12b and 12c run on the back surface of the screen S. . That is, the cleaning blade 12c and the cleaning blades 12a and 12b move on the back surface of the screen S together with the cleaning cloth paper 14 interposed therebetween.
A reversing device is added to the cleaning device 10A so that the cleaning blades 12a, 12b, 1
2c may be elastically contacted.

The cleaning cloth 14 is automatically supplied to the tops of the first and second cleaning blades 12a and 12b, and the solvent capable of dissolving the ink remaining on the screen S is automatically blotted. To be included. That is, when the cleaning operation is repeated to some extent, the first
Also, the cleaning cloth paper 14 on the second cleaning blades 12a and 12b moves slightly so that a new portion moves to the top of the cleaning blades 12a and 12b, and the solvent is supplied to the new portions.

Therefore, while the screen S is sliding, the cleaning blades 12a and 12b can wipe off the residue such as ink remaining on the screen S with the help of the solvent, and the third cleaning blade 12c. Scrapes the ink. Each of the cleaning blades 12a and 12b is a double blade type made of two thin steel plates.

As shown in FIG. 1, the cleaning device 10
A has a square base plate 16. The base plate 16 is shown in FIG.
Is stretched in the paper spine direction. First and second rectangular housings 18 and 20 are provided on the base plate 16 as supports. The housings 18 and 20 as the supports may be simple frames. First housing 18
Has a corner portion 18a at its lower portion as illustrated. The housing 18 is detachably mounted on the base plate 16, while the housing 20 is detachably fixed to the base plate 16.

That is, the housing 18 can be easily removed from the base plate 16 when necessary. A paper feed roller 22 and a take-up roller 24 are rotatably housed in the housing 18, and their axes are parallel to each other. The cleaning cloth 14 is wound around the paper feed roller 22 and then supplied to the take-up roller by a method described below. The cleaning cloth paper 14 is made of paper such as roll paper or an appropriate cloth.

A press roller 26 is rotatably supported near the paper feed roller 22, and the press roller 26 is biased to the right in FIG. 1 by a spring 28. The press roller 26 is pressed against the drive roller 30, and the drive roller 30 is rotatably supported by the housing 20. Drive roller 3
0 has a cylindrical peripheral surface covered with a rubber skin. A window hole 32 is formed in the housing 20 to ensure pressure contact between the press roller 26 and the drive roller 30.
The drive roller 30 is a drive mechanism described later (see FIG. 3).
Rotates in the direction of the arrow.

The housing 18 has a rectangular window hole 18 at the top.
In this housing 18, a rectangular box 3 is formed.
4 is stored, and the inside of the box 34 is the window hole 18
facing b. The box 34 is detachably connected to the housing 18 with a one-touch type connector. That is, the box 34 can be removed from the housing 18 when needed. In the box 34, a rectangular guide 36 is arranged at a substantially central portion, and two-blade storage portions are formed on both left and right sides thereof. Blade holders 38a and 38b are slidably accommodated in these two accommodating portions, respectively, and these hold the first and second cleaning blades 12a and 12b. Then, in order to urge the blade holders 38a, 38b outward, which is the upper portion of FIG. 1, springs 40a,
40b is arrange | positioned at each storage part. A balance roller 42 is rotatably arranged between the blade holders 38a and 38b.

The cleaning cloth paper 14 fed from the paper feed roller 22 is nipped between the press roller 26 and the drive roller 30, passes through the top of the cleaning blade 12b, and then the balance roller 42 to the cleaning blade 12
It reaches the top of a. When the drive roller 30 rotates in the direction shown by the arrow in the figure, the cleaning cloth paper 14 is delivered from the paper feed roller 22 toward the cleaning blade 12b. The drive roller 30 is controlled so as to drive the cleaning cloth 14 for each rotation by several mm.

Winding roller 24 and balance roller 4
The first and second drive belts 44 and 46 are arranged as shown by phantom lines in the drawing in order to rotate the two in the directions of the arrows. The first drive belt 44 is wound around the shaft of the press roller 26, the winding roller 24, and the four guide rollers 48, 50, 52, 54.
In addition, the second drive belt 46 is a guide roller 50.
Is wound around the shaft of the balance roller 42.
Therefore, when the drive roller 30 rotates, the press roller 26 rotates, and the first and second drive belts 44 and 46 rotate the take-up roller 24 and the balance roller 42, whereby the cleaning cloth 44 is taken up. Take up on roller 24. Cleaning cloth 14
The movement along the predetermined route is performed intermittently.

As shown in the drawing, the second housing 20 as a support has a rectangular window hole 20a in the upper portion.
A rectangular box 56 is housed in the housing 20 so as to face the window hole 20a. The box 56 is detachably connected to the housing 20 in the same manner as the box 34. A blade holder 58 is housed in the box 56, and the blade holder 58 holds the third cleaning blade 12c. A spring 60 is arranged to bias the blade holder 58 outward, that is, upward in the drawing. A pipe connecting portion 20b is formed in a lower portion of the housing 20, and the pipe connecting portion 20b is formed.
A pipe extending from a suction pump (not shown) is connected to b. That is, when the vacuum pump is operating, the ink scraped off by the cleaning blade 12c is immediately discharged to the outside through the housing 20.

As shown in FIG. 2, the cleaning blade 12
a and 12b are two thin plates 12a-1 and 12a-, respectively.
2 and a slight gap is formed between them. The thin plates 12a-1 and 12a-2 have a thickness of about 100 to 2
It is 00 μm, preferably 5 to 15 mm protruding from the blade holders 38a, 38b. Thin plates 12a-1 and 12a
The gap formed between the -2 and the blade holder 38a, 38b
Of the pipe 62, 64
64 communicates with a solvent supply source (not shown). In the figure, the pipes 62 and 64 are connected to a common pipe 66, and the common pipe 66 extends to a solvent supply source. The common pipe 66 has an electromagnetic valve 68 to selectively open and close the flow of the solvent.

In the figure, reference numerals 70 and 72 are connectors,
As a result, the pipes 62 and 64 can be detachably attached to the blade holder 38.
a and 38b, respectively. Therefore, when the solvent is supplied, the electromagnetic valve 68 operates to open the solvent flow passage, and a predetermined amount of the solvent is discharged from the gap between the cleaning blades 12a and 12b.
Cleaning cloth paper 14 is attached to the cleaning blades 12a and 12b.
When such an ejecting operation is performed in the state where the cleaning cloth 14 is placed, the cleaning cloth 14 is wetted with the solvent.

A mechanism for driving the drive roller 30 will be described with reference to FIG. FIG. 3 is a rear view of the cleaning device 10A of FIG. The drive mechanism has a first pneumatic cylinder 74 mounted on a slider (not shown). The slider can move forward and backward (vertical direction in the drawing) together with the cylinder 74. The cylinder 74 has a piston rod 74 a, and an end portion of the piston rod 74 a is connected to the base plate 16. That is, when air pressure is supplied into the cylinder 74, the piston rod 74a projects from the cylinder 74 and pushes up the cleaning device 10A toward the screen S.

One end of the drive lever 76 is rotatably connected to the shaft 30a of the drive roller 30 via a one-way clutch. An L-shaped rod 80 is connected to the other end of the drive lever 76 via a pin 79, and the lower end of the rod 80 is connected to the cylinder 74. That is, when the piston rod 74a projects from the cylinder 74, the drive lever 76 rotates downward (clockwise in FIG. 3) about the shaft 30a of the drive roller 30. However, due to the one-way clutch 78, the downward rotation of the drive lever 76 does not cause the drive roller 30 to rotate in the sheet feeding direction.

When the piston rod 74a is pulled into the cylinder 74 by the next operation of the cylinder, the drive lever 76 rotates upward (counterclockwise in FIG. 3). When the drive lever 76 rotates upward, the drive roller 30 is rotated in the sheet feeding direction by the action of the one-way clutch 78. The drive lever 76 is formed with a plurality of small holes 76a to 76d with which the pin 79 can be engaged.
The rotation pitch of the drive roller 30 can be changed or controlled by connecting the rod 80 to any of these small holes 76a to 76d via the pin 79.

Next, the operation of the cleaning device 10A will be described with reference to FIGS. In order to simplify the description, the following description will be started from the state where the printing process has already been completed. Until this time, the cleaning device 10A is in the standby position. That is, the slider on which the cleaning device 10A is mounted is stationary at the position where the cleaning blades 12a and 12b move downward in the drawing away from the screen S when the piston rod 74a of the cylinder 74 is pulled into the cylinder 74. After printing on the insulating substrate, etc., the insulating substrate is the screen S.
Cylinder 74 is removed from the cleaning device 10.
It operates to raise A, and the cleaning cloth 14 is not fed out and stands still due to the movement.

The cleaning cloth paper 14 placed on top of the cleaning blades 12a and 12b is a clean portion. When the cleaning device 10A rises and reaches the operating position, the electromagnetic valve 68 opens within a predetermined time, whereby the solvent is supplied to the gap between the cleaning blades 12a and 12b and the cleaning cloth 14 is wetted with the solvent. Then, the slider moves back and forth together with the cleaning device 10A, whereby the ink remaining on the screen S is wiped off by the cleaning blades 12a and 12b, or the ink scraped off by the cleaning blade 12c is sucked into the housing 20 and connected to the pipe. It is discharged from the portion 20b to the outside. When the slider returns to the initial position, the cylinder 74 operates to move the cleaning device 10A downward from the operating position, whereby the drive lever 76 rotates upward.

When the drive lever 76 is rotated upward, the drive roller 30 is rotated in the sheet feeding direction, and the cleaning cloth 14 is moved to wipe the ink. To be wound up. By adjusting the rotation pitch of the drive roller 30 and / or the spacing between the cleaning blades 12a and 12b, it is possible to prevent the portion wiped by the cleaning blade 12b from being placed on the cleaning blade 12a. After the above operation is completed, the cleaning device 10A returns to the standby position.

As shown in FIGS. 4 and 5, the cleaning blade 12c is not single like the cleaning blade 12c shown in FIGS. 1 and 3, but the cleaning blades 12c-1 and 12c-.
2 may be held by blade holders (no reference number), the blade holders may be fixed to both ends of the plate 82, and the plate 82 may be rocked by the shaft 84 to be arranged like a seesaw. . As shown in FIG. 3, the shaft 84 is pivotally attached to a pinion 86, and the pinion 8
6 is engaged with a rack 88, the rack 88 is connected to a piston rod 90a, and the piston rod 90a is rotated by a drive device which is engaged with the pneumatic cylinder 90.

That is, the rack 88 is lowered as shown by the on / off operation of the pneumatic cylinder 90 and the pinion 86 is rotated counterclockwise, whereby the cleaning blade 12c-1 is projected upward. On the contrary, rack 88
, The pinion 86 rotates clockwise, and the cleaning blade 12c-2 projects and the cleaning blade 12c
-1 is drawn. Thus, the cleaning blade 12c
Each of -1 and 12c-2 can be alternately pressed against the screen S according to the moving direction of the slider. Further, a solvent may be supplied to each of the cleaning blades 12c-1 and 12c-2. That is,
As shown by the broken line in FIG. 4, the cleaning blade 12c-1,
The solvent discharge pipe 92 is disposed between the 12c-2 and the solvent discharge pipe 9
A solvent supply source is connected to 2 via the electromagnetic valve as described above.

FIG. 5 shows a second embodiment of the present invention, and the same reference numerals as those in the first embodiment have the same structure and operation. In contrast to the single cleaning blade 12d, this cleaning device 10B has the cleaning blade 12d.
c-1 and 12c-2 are adopted, and there is no means for wetting the cleaning cloth 14 with a solvent. The cleaning blade 12d is housed in the box 102 and is urged upward by the spring 104, and the box 102 is detachably connected to the housing 18. Cylinder 7 in this example
4, a slider 100 for fixing 4 is shown, and this slider 100 can be moved forward and backward in the horizontal direction (left and right direction in the drawing).

The cleaning blade 12d is composed of one sheet,
The cleaning blades 12c-1 and 12c-2 have the seesaw structure as described above. Cleaning blades 12c-1, 12
A solvent discharge pipe 92 is arranged between c-2. The operation of the cleaning device 10B in this example is almost the same as that of the cleaning device 10A, except that the cleaning blades 12c-1 and 12c-2 are moistened with the solvent discharged from the solvent discharge pipe 92. In this way, the ink on the screen S is dissolved by this, and the dried cleaning cloth paper 14 is sucked up.

FIG. 6 shows a third embodiment of the present invention, and the same reference numerals as those in the first and second embodiments have the same configuration and operation. The cleaning device 10E differs from the cleaning device 10A and the like in that the press roller 26, the drive roller 30, and the cleaning blade 12 are different.
c-1 and 12c-2. That is, in the former, as shown in FIG. 7, the press roller 26 rotated by the drive roller 30 has the gear 26 a,
The gear 158 meshes with a, and the gear 158 meshes with the gear 160. The gear 160 has a pulley 160 a, and a pulley belt 162 is wound around the pulley 160 a, and the pulley belt 162 is wound around the shaft of the winding roller 24. Therefore, the press roller 26 is rotated by the rotation of the drive roller 30, and this rotation is transmitted to the pulley belt 162 via the gears 26a, 158, 160, and the winding roller 24 can be wound and rotated.

In the latter case, as shown in FIGS. 6 and 8 to 10, the cleaning blades 12c-1 and 12c-2 have racks 164 and 166, respectively.
A small pinion 168 is rotatably supported between the two.
As shown in FIG. 8, the small pinion 168 rotates on the large pinion 86 that meshes with the rack 88. The rack 88 is driven by a piston rod 90a of a pneumatic cylinder 90.
Therefore, when the pneumatic cylinder 90 operates and the piston rod 90a advances and retracts, the small pinion 168 rotates via the large pinion 86, whereby the cleaning blade 12
c-1 and 12c-2 perform a seesaw motion.

FIG. 11 shows a fourth embodiment of the present invention, and the same reference numerals as those in the first to third embodiments have the same structure and operation. The cleaning device 10J is different from the cleaning device 10A and the like in that the cleaning device 1 including a roller type cleaning unit 300 is added.
The roller type cleaning unit 300 has a container 302 containing a predetermined amount of solvent, and a support 308 rotatably supports an upper roller 304 and a lower roller 306 in the container 302. A cleaning cloth 310 is wound between these rollers 304 and 306. Therefore, when the upper roller 304 rotates, the cleaning cloth 3
The lower roller 306 can be rotated through 10. Since the lower roller 306 is immersed in the solvent, the cleaning cloth 310 is always soaked with the solvent.

Piston 31 connected to the bottom of container 302
A pneumatic cylinder 312 having 2a is interposed between the base plate 16 and the container 302. Therefore, the operation of the pneumatic cylinder 312 causes the container 312 to rise when the piston 312a projects, and the cleaning cloth 310 moistened with the solvent contacts the screen S.

FIG. 12 shows the details of the upper roller 304 and the lower roller 306. The lower roller 306 has a conical shape, but the upper roller 304 has a cylindrical shape. The lower roller 306 has a conical shape in order to prevent the cleaning cloth 310 from moving in the axial direction of the upper roller 304 and being biased.

FIG. 13 shows a structure in which the axial distance between the upper roller 304 and the lower roller 306 can be arbitrarily adjusted. The lower roller 306 has a holder 314 that is rotatably supported by the holder 314. The bolt 316 that engages with the screw hole formed in the protruding portion 308a of the structure portion 308 can be rotated to move up and down by twisting to the right or left. Reference numeral 318 is a stopper bolt for fixing the bolt 316.

14 and 15 show a bearing structure of the upper roller 304 and the lower roller 306. This bearing structure has a first sheet 320 firmly held in the shaft hole of the upper roller 304 and a holding structure portion. A second seat 322 rigidly held by 308 and a ball bearing 32 interposed between the first and second seats 320,322.
4 and. Each of the seats 320 and 322 has a recessed portion with which the ball bearing 324 abuts, and the head portion has a screw shape that can close the shaft hole of the upper roller 304 and has a screw portion in the axial direction.
4 or the holding structure portion 308 can be screwed and fixed. The heads of the sheets 320 and 322 have a function of closing the shaft hole of the roller 304, and prevent particles of residue such as scraped ink from entering the shaft hole and hindering the rolling of the ball bearing 324. By doing so, it is possible to prevent the rotation of the roller 304 from being obstructed.

It should be noted that, in addition to the above-described embodiments, various configurations and structures are possible without departing from the gist of the present invention.
The structure is permissible and is not particularly limited to the drawings and the like in the above example. For example, the cleaning devices 10A, 1
The screens 0B, 10E, and 10J may be fixed, and the screen may be moved in the horizontal direction. Also, the detachable part is divided and the cleaning cloth 1
4 is a stock form type instead of roll paper,
Further, the present invention is not subject to any restrictions such as change / presence / absence of solvent supply means, and therefore, the illustration is omitted in common in each drawing.

[0042]

As can be easily understood from the above description, the present invention has the following effects in screen printing.

In the cleaning method according to the present invention, the apex of the cleaning blade facing the back surface of the screen acts as a cleaning blade on the back surface of the screen, either directly or by being covered with a cleaning cloth paper, so that it is unnecessary to attach to the back surface of the screen. All the residues are removed smoothly. Then, since the cleaning cloth is renewed for each cleaning step, the cleaning is always performed efficiently.

Further, by moving the contact surface to the screen with a small contact surface area of the cleaning blade coated with the cleaning cloth paper soaked with the solvent, the solvent in the gap between the two cleaning blades can be removed. Facilitates seepage,
Enables continuous printing without causing obstruction factors and plate separation problems caused by solvents.

Furthermore, by using a solvent in the front part of the plurality of cleaning blades and using the solvent in the rear part as a dry type in a series of steps, it is possible to dissolve and remove the flux residue on the screen surface at the same time. In addition to easy cleaning, it is possible to dissolve and remove residues that are difficult to remove.

Next, since the solvent is applied by the cleaning blade, the process from the storage of the solvent to the discharge through the pipe line can be easily done. The cleaning blade is used as the discharge port and the cleaning blade, and the cleaning cloth is coated for wiping. Therefore, the cleaning effect can be easily enhanced by integrating the three functions.

Furthermore, by adopting the unit construction of the apparatus with the main body section and the cassette section by this method, the replacement of the consumable paper and the maintenance of the thin blade cleaning blade, the solvent coating mechanism, etc. can be carried out easily and easily. Become.

In the cleaning device according to the present invention, the cleaning blade is moved up and down to bring the cleaning blade into and out of contact with the back surface of the screen. Since the paper is updated every cleaning process, effective screen cleaning can be achieved. As a result, fine-pitch screen printing can be continuously performed within a certain range with a good screen printing plate each time.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a partial perspective view of the first embodiment.

FIG. 3 is a schematic configuration diagram showing a drive mechanism in the first embodiment.

FIG. 4 is a schematic diagram of a partially modified example of the first embodiment.

FIG. 5 is a schematic configuration diagram similar to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a schematic diagram of a main part configuration showing a third embodiment of the present invention.

FIG. 7 is a schematic diagram of a partial configuration according to a third embodiment.

FIG. 8 is a partial configuration schematic diagram in the third embodiment.

FIG. 9 is a schematic diagram of a partial perspective view of a third embodiment.

FIG. 10 is a front view of FIG.

FIG. 11 is a schematic configuration diagram showing a fourth embodiment of the present invention.

FIG. 12 is a partial perspective view of a fourth mode.

FIG. 13 is a partial perspective view of a fourth mode.

FIG. 14 is a partial cross-sectional view of a fourth mode.

FIG. 15 is a schematic perspective view of FIG.

[Explanation of symbols]

 12a, 12b, 12c ... Cleaning blade 14 ... Cleaning cloth paper 18, 20 ... Housing 22 ... Paper feeding roller 24 ... Winding roller 26 ... Press roller 28 ... Spring 30 ... Drive roller 62, 64 ... Solvent piping

Claims (11)

[Claims] 1. In screen printing in which a screen that has finished printing is reused for subsequent printing, a cleaning blade made of a thin plate is elastically contacted with the front surface or the back surface of the screen to move the screen or the cleaning blade. A cleaning method in screen printing, which is characterized in that residual ink or residue such as solder paste is removed. 2. The cleaning method for screen printing according to claim 1, wherein a cleaning cloth for wiping off the residue is interposed between the screen and the cleaning blade. 3. The cleaning method in screen printing according to claim 2, wherein the cleaning cloth is soaked with the residual solvent. 4. The cleaning method for screen printing according to claim 2, wherein the cleaning cloth is in the form of a roll and can be intermittently fed and wound. 5. A support which is capable of advancing and retreating toward a screen on which a residue such as ink or solder paste is left after printing is completed and which can be moved in a horizontal direction, and a surface of the screen which is detachably supported by the support. Alternatively, a cleaning device in screen printing, comprising a cleaning blade made of one or a plurality of thin plates capable of elastically contacting the back surface. 6. A support which is capable of advancing and retreating and moving horizontally toward a screen on which a residue of ink or solder paste has been left after printing, and a front surface of the screen which is detachably supported by the support. Or a cleaning blade for screen printing, which comprises one or a plurality of cleaning blades made of a thin plate capable of elastic contact with the back surface, and a cleaning cloth interposed between a part or all of the cleaning blades and the screen. apparatus. 7. A support which is capable of advancing and retreating and moving in a horizontal direction toward a screen on which a residue of ink or solder paste has been left after printing, and a front surface of the screen which is detachably supported by the support. Alternatively, one or a plurality of cleaning blades made of a thin plate capable of elastically contacting the back surface, a cleaning cloth interposed between the cleaning blade and the screen, and a drive mechanism for intermittently feeding and winding the cleaning cloth. A cleaning device for screen printing, comprising: 8. A support which is capable of advancing and retreating and moving horizontally toward a screen on which a residue of ink or solder paste has been left after printing, and a front surface of the screen which is detachably supported by the support. Alternatively, one or a plurality of cleaning blades made of a thin plate capable of elastic contact with the back surface, and a cleaning cloth paper interposed between the screen and the cleaning blades,
A cleaning device in screen printing, comprising: a mechanism for intermittently feeding and winding the cleaning cloth paper; and a mechanism for discharging a residual solvent onto the cleaning cloth paper. 9. The cleaning cloth paper is provided with a mechanism for intermittently feeding and winding the cleaning cloth in conjunction with the movement of a support body moving forward and backward toward the screen. A cleaning device for screen printing according to item 1. 10. The cleaning device for screen printing according to claim 5, wherein the cleaning blade comprises two thin plates fixed to a blade holder with a predetermined gap. 11. The cleaning device for screen printing according to claim 10, wherein a pipe for discharging the residual solvent is connected between the two thin plates to the holder.