JP2908992B2 - Method and apparatus for cleaning a printing screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Screen cleaning methods and apparatuses used for screen printing on electronic circuit boards are roughly classified into the following three types. One is to directly spray a liquid solvent on a back surface (hereinafter, abbreviated as a back surface) as a main front and lower surface of the screen after printing to remove unnecessary printing material that has flowed around the back surface. The second one is to clean the back surface of the synthetic paper or fabric in a roll form (hereinafter, collectively referred to as a cloth body) and wipe off unnecessary substances (hereinafter, abbreviated as “wiping”). The third one is to mainly press a thick synthetic blade against the back surface to scrape off solder particles and the like as unnecessary residues. Further, in the third printing material, two cleaning blades are combined before and after the cleaning direction, and a printing image pattern portion (hereinafter, abbreviated as printing plate) on a screen is clogged. Between the two joined blades by using compressed air or by vacuuming in some cases.

[0003] The above-mentioned conventional cleaning method or apparatus is mainly applied to a metal screen, but may be used also for a mesh screen as the definition of a printed image pattern advances. .

[0004]

The conventional methods and apparatuses for cleaning the back surface of the screen have advantages and disadvantages. For example, in the first example, it is necessary to perform post-processing of the printing material as an unnecessary residue that has dissolved in the sprayed solvent and dropped directly below the back surface, which is troublesome.
In the second method, the solvent and a small amount of oils and the like in the printing material are relatively easily removed, but minute solder particles and the like as solids tend to remain. In the third case, on the other hand, high-viscosity materials including solder at the opening of the printing plate are removed smoothly, but liquid materials are difficult to remove. Japanese Patent Application No. 6-184229 has been devised to remove the liquid, but the necessity of cleaning the back surface of a clear screen plate is increasing in order to realize printing of a finer print pattern. Hereinafter, all the objects to be cleaned are collectively referred to as residues.

The present invention has been made in view of the above problems, and provides a cleaning method which eliminates the disadvantages of the prior art without correcting the advantages thereof, and a cleaning unit and apparatus based thereon. is there. Less than,
When simply referring to a method, a unit, or an apparatus, it refers to a method, unit, or apparatus for cleaning the back surface of a printing screen according to the present invention.

[0006]

In order to solve the above-mentioned problem, a method according to the present invention comprises a blade having a sufficiently thin blade having a rigidity which is not inferior to the tension of a printing screen. A part whose part is uniformly adhered and covered in the length direction by a cloth body is used as a cleaning blade. Further, a single cleaning blade or a plurality of cleaning blades are used. Further, the cleaning liquid is atomized, the cloth is renewed as necessary, and the cleaning blade portion having the cloth is made into a detachable cassette type so that these series of operations can be performed more easily and reliably. Is updated by driving the pressing roller through the fabric by the pressing roller on the cassette side and by the constant pitch driving by the feed roller on the non-cassette side through the fabric. The residue of the fabric by the squeegee blade is renewed by one cleaning and is performed on a new fabric. At the same time, it becomes a new secondary residue and results in hindering cleaning. Therefore, it is necessary to perform a cloth cleaning blade while reducing the residue before wiping the cloth. By performing the cleaning while preventing the secondary residue, the cleaning can be performed together with the renewal of the cloth every time. The air suction from the main unit also contributes to the reduction of residues, and the atmosphere during suction can exhibit the effect of the atmosphere solvent while preventing intrusion into the screen plate opening and preventing so-called plate separation. . By performing cleaning in a reciprocating manner by one printing, cleaning by the cleaning blade and the atmosphere on the outward path, and performing cleaning by the cleaning blade on the renewal of the cloth on the return path, a sufficiently stable wiping effect can be obtained. Continuous printing of a fine pattern can be easily performed by using a combination of configurations.

Next, the unit according to the present invention holds a loop-shaped fabric body by a guide roller (side plate portion) in addition to each element necessary for realizing the method of the preceding paragraph.
It has a mechanism to clamp the cloth body between the circumferential surfaces of the feed roller and the press roller. A groove or a mounting plate is provided on the side plate or the support member to support both ends of the above elements in the axial length direction. A one-way clutch to be connected to the drive lever of the external drive means is provided at one end of the feed roller, and the whole of each element forms a kind of unit by connecting the side plate or the support member.

Subsequently, the unit according to the present invention is provided with means for supplying a new cloth and a means for collecting used cloth instead of the above-mentioned loop-shaped cloth.

In the apparatus according to the present invention, an air cylinder for raising and lowering the unit described in the preceding paragraph is provided, and the external drive means serves as a power source for the apparatus.

[0010]

In the method according to the present invention, a sufficiently thin and highly rigid blade whose tip is covered with a soft cloth is used as a cleaning blade, so that the blade is in close contact with the screen back surface, and The renewal of the main surface of the cloth body is performed at a constant pitch by the feed roller and the press roller, and the residue is easily and efficiently removed.

Next, in the unit according to the present invention, since the structural members to be assembled and supported can be connected to each other to realize the above-mentioned method, the residue can be removed as a whole without selecting a partner printing apparatus. To

Next, in the unit according to the present invention, since the means for supplying and collecting the loop-shaped cloths described in the preceding paragraph can be detached in a cassette type together with the squeegee and the squeegee can be easily replaced with a new cloth for a relatively long time. Over a range of residues.

In the apparatus according to the present invention, when the air cylinder for elevating the unit is lowered, the one-way clutch provided at one shaft end of the feed roller operates by using the movement as an external drive source. The shaft is rotated by a predetermined pitch, whereby the main surface of the screen back surface cleaning cloth covering the cleaning blade is updated. Therefore, when the air cylinder raises the unit and the blade touches the screen back,
The cloth body that closely adheres and covers it is always new.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The gist of the present invention will be described below based on embodiments with reference to the drawings. FIG. 1 is a conceptual drawing for explaining the structure and function of a cleaning method according to the present invention. The cleaning blade, which is perpendicular to the direction of cleaning and acts most directly on residue removal, and its screen back side. This means a cross-sectional view of a main part configuration viewed from a length direction which is common to a cloth or the like covering the front end. In the same figure, arrow S indicates the back surface of the screen to be cleaned, C indicates the cleaning direction, 1 indicates the feed roller, 2 indicates the cloth body (P) with the feed roller and its own circumferential surface. A pressing roller 3 for holding the P to have a constant tension, and a roller pressing spring for guiding the movement of the pressing roller 4 and a length 0.1 mm, which is sufficient to cover the width of the area to be cleaned on the back surface of the screen. It has a thickness of at most about 0.2 mm and
, A cleaning blade of high rigidity (for example, made of steel plate) having a width of several mm to several tens of mm, and 5 represents a holder for the blade. The symbol d represents the rotation pitch of the feed roller 1, the number as a subscript of d represents the pitch interval, 3 is a pressing means for pressing 2 toward 1, and 11 is attached to one end of 1. 1 illustrates a one-way clutch. In the figure, the feed roller (1) is rotated clockwise, and the cloth (P) is fed counterclockwise. However, depending on the application, the cloth bodies (P) may be in opposite directions to each other. Further, although the degree of adhesion of P to 4 looks very loose in the figure, it is a result of making the illustration easier to understand,
In actuality, it is uniformly adhered to the width of the tip required for cleaning. There is no particular limitation on the inclination of S4 to S, but depending on the cleaning situation, C
It leans forward slightly in the direction of が, but may be vertical. d
The length of the feed of one cloth of the squeegee 4 is represented by the rotation angle of the feed roller 1. The length of the feed is determined by the distance between the fulcrum 19 and d. The feed roller (1)
The length of P which is sandwiched by the peripheral surface of the pressing roller 2 and sent by one rotation is determined by this. Further, with respect to the pressing means (2), which is not shown in the drawing, the pressing plate attached to the tip of the spring is extended to both left and right ends or the center so that the pressing plate is uniformly pressed along the axial length. What is necessary is just to slidably press. The essence of this method is that the tip of the rigid blade of an ultra-thin blade of at most about 0.2 mm is used as a residue removal target in a state in which the rigid blade is alone or several times, and is closely adhered and covered with a cloth body. Is pressed against the back surface of the screen, and the coated surface is renewed for each step of cleaning.

FIG. 2 is a cross-sectional view of a main part structure for explaining the structure and function of the cleaning unit according to the present invention, viewed from the opposite direction to that of FIG. The meaning of each code / symbol is exactly the same as in FIG. G denotes a cassette of the cassette type of G shown in FIG. 1 and is provided with side plates or supporting members, and 2 or 3, 4, 4, 5, 12, 1 which are components of a cassette composed of the side plates or supporting members.
3, P1, P2, etc., which are assembled by connecting the side plates or support members at both ends in the axial direction of each component, and G forms a kind of unit. The operation of each element is, of course, the same as that described in the previous section. The illustration of the one-way clutch attached to one end of the feed roller (1) and the pressurizing means for 1 and the specific example thereof are also shown in FIG. As described in the above. The present unit (U) is constituted by a cassette unit G which is connected to or mounted on the unit, and is operated by a drive source provided outside the unit (U).
The cassette unit is driven by the same drive source, and as a whole, it is portable and can be mounted as a cleaning unit on the back surface of the screen of the screen printing device via a mounting device or a support device without selecting a printing device to be mounted. It is possible.

It should be noted that the cassette shown in FIG. 2 can be constituted by a plurality of units, and the present apparatus can be provided with a drive unit inside instead of being operated by a drive source provided outside. Can be used.

FIG. 3 is a cross-sectional view of a main part configuration for explaining a mechanism in which the unit illustrated in FIG. 2 and described in the preceding paragraph is actually operated by a driving source provided outside the unit. 6 is an air cylinder attached to the support base (B), 7 is a support plate and a unit (U) via a transmission rod 8
, 9 indicates a connecting rod, 10 indicates a lever, and 11 indicates that a one-way clutch is attached to one end of a feed roller. From the arrangement of the drive lever with respect to one end of the feed roller in U, it is known to be a cross-sectional view as seen from the opposite direction of FIG. All the elements shown in FIG. 2 are essential elements that make up the device according to the invention. That is, when the air cylinder (6) is lowered, the unit (U) is lowered via the support plate (7) and the transmission rod (8), and accordingly, the unit 4 or the tip which is in contact with S is covered. P also moves away from S. While the above-described lowering operation to the predetermined position is completed, via the connecting rod (9),
The drive lever (10) operates and the one-way clutch (11)
The feed roller is rotated by a constant pitch through. As described with reference to FIGS. 1 and 2, in this process, the main surface of the cloth (P) covering the cleaning blade is updated.
Then, in the next ascent operation, the shaft remains fixed from the mechanism 11 and therefore P is not transferred, which contributes to the removal of S residue as an update surface. That is, the whole shown in FIG. 1 is the device of the present invention.

In addition to the above embodiments, various configurations and structures are allowed without departing from the gist of the present invention. In particular, the present invention is not limited to the drawings and the like of the above embodiments. Absent. For example, the present invention is not subject to any restrictions on the presence or absence of the provision of the solvent supply means for impregnating the solvent for residue removal into the above-described wiping cloths and the presence of the solvent, and therefore, The illustration is omitted in each drawing.

[0019]

As will 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 tip of the ultra-thin blade rigid blade, which is directed toward the back surface of the screen, is closely adhered and covered with a cloth or the like including synthetic paper, and is used as a cleaning blade for the back surface of the screen. All residues are removed smoothly. And since the said cloth body is renewed for every one process of cleaning,
The cleaning is performed efficiently.

The cleaning unit according to the present invention comprises:
In addition to achieving the effects of the preceding paragraph, it is difficult to remove the residue on the back surface of the screen plate depending on the printing material to achieve the printing of narrow and fine patterns. However, it is not easy to replace the cloths for cleaning, and the cleaning of the cloths is not easy. However, there are many problems. The cleaning effect by using the squeegee blade by using the squeegee blade due to the atmosphere and the close contact with the fabric makes it possible to continuously realize stable narrow and fine pattern printing due to the cleaning effect. It is possible to flexibly cope with the printing device and use it.

In the cleaning device according to the present invention, an air cylinder is used as a drive source provided outside the unit. However, another drive source may be used. And the main surface of the cloth body, which closely adheres and covers the blade, is renewed for each of the separated surfaces, so that the cleaning is performed efficiently and, consequently, a good plate result is obtained. Results in good continuous printing

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment of a cleaning method. Main unit unit, cassette unit

FIG. 2 is a cross-sectional view of a main part configuration showing an embodiment of a cleaning unit. Main unit unit, drive unit and omitted cassette unit

[Explanation of symbols]

REFERENCE SIGNS LIST 1 feed roller 2 holding roller (pressing roller) 3 roller pressurizing spring 4 blade 4-1 squeegee blade (single part) for covering cloth material in cassette 4-2 squeegee blade (single part) in main unit 4-3 main body Squeegee blade in unit (single part) 4-1-2 Squeegee blade coated with fabrics in cassette (plural pieces) 4-2-2 Squeegee blade in main unit (plural pieces) 4-3-2 Squeegee blade in main unit (Plural pieces) 5 Blade holder 5-1 Blade holder in cassette (single part) 5-2 Blade holder in body (single part) 5-3 Blade holder in body (single part) 5-1 -2 Blade holding unit in cassette (multiple squeegee holding unit) 5-2-2 Squeegee blade in main unit (multiple squeegee holding unit) 5-3-2 Main unit Squeegee blade in unit (several squeegee holder) 6 Air cylinder 7 Main unit support plate 7-1 Main unit support plate 7-2 Feed roller and clutch bearing drive unit support plate (cylinder coupling) 7-3 Unit main unit feed Roller and clutch bearing drive unit support plate 8 Cylinder transmission rod 9 Elastic connection rod 10 Drive lever 11 One-way clutch 12-1 to 6 Drive roller 13 Drive belt 14 Squeegee drive gear 15 Squeegee drive gear 16 Solvent atmosphere pipe 17-1 Reference Signs List 2 air pipe 17-3 air outlet 18 solvent pipe for atmosphere 19 fulcrum for variable pitch 20 cleaning squeegee horizontal (two squeegees are used simultaneously), vertical drive unit 21 rotation support unit C-1-2 cleaning direction (outbound and return) S screen P Cloth type P-1 Send cloth type Part (supply side) P-2 Cloth body discharge part (winding side) G Cassette part (side wall / surrounding) G-1 Cassette insertion / extraction opening G-2.4.5 Squeegee opening (air ventilation hole) 6 Squeegee part air (air vent) G-7 vent opening / closing part G-3 cassette part pressing roller opening (feed roller contact surface opening) U main unit d feed pitch d-1 to 5 variable feed pitch

Claims (11)

(57) [Claims] 1. A pressing roller which can be pressed against a peripheral surface of a cylinder, means for pressing the roller, a cleaning blade having an ultra-thin blade, a plurality of guide rollers, a supply roller, and a winding roller. The main surface of the printing screen back surface wiping cloth and the like is guided and held by the rollers so that the surface of the blade tip can be in close contact with and cover the surface of the blade tip, and the feed pitch of the feed roller is corresponding to each of the angle by the shaft rotates, is configured to go updated, clean lines which have the updated surface by pressing on the screen rear surface through the blade tip, a loop of the fabric such Substitute for body
To provide a new cloth for cleaning the back of a printing screen.
Supply means that can be supplied and the used cloth body can be collected
Cleaning device for a printing screen provided with a collecting means
The cleaning unit, the support plate, and the transmission rod.
Air placed on a support that can raise and lower the
Cylinder and feed roller in the above cleaning unit
Connected to the one-way clutch attached to the
Connecting the drive lever, the support plate and the drive lever
And a drive that is provided outside the unit.
Means, the tip of which is closely adhered and covered by a cloth body
The tip of the ultra-thin blade cleaning blade is
The above air cylinder for contacting and separating from the back of the lean
Each time the cylinder unit moves up and down, the cloth
A printing screen configured to update the main surface of the class
Cleaning equipment. Wherein the drive unit of claim 1 Symbol mounting of the cleaning unit and the support plate and the feed roller in the air cylinder and the cleaning unit mounted on the support base capable of lifting the click leaning unit via a transmission rod A drive lever, which is provided outside the unit, comprising a drive lever coupled to the mounted one-way clutch, and a connecting rod capable of changing the rotation pitch of a feed roller connecting the support plate and the drive lever. Each time the cleaning unit is moved up and down by the air cylinder for moving the tip of the cleaning blade of an ultra-thin blade closely contacted and covered with a cloth body to the back and forth of the printing screen, the cloth A printing screen cleaning device configured to update a main body surface. 3. The cleaning roller of claim 1 or 2, wherein the cleaning blade having a cloth body and the cleaning blade of the ultra-thin blade are constituted by a single or a plurality of cleaning blades, and the feed roller is driven. A cleaning device for a printing screen configured to clean a back surface of a screen together with a cleaning blade having a cloth body by moving a single or a plurality of cleaning blades up and down. 4. A cleaning blade having a cloth-like body on the cleaning blade of the ultra-thin blade according to claim 1 and a cleaning blade having a cloth-like body, wherein the cleaning blade of the ultra-thin blade is detachable. Or, a cleaning device for a printing screen configured so that a single cleaning blade can be used. 5. The intermediate portion or configured printing screen cleaning device so as to have a cleaning liquid misty air mechanism before and after the cleaning blade portion of the removable ultra thin blade of claim 1, wherein. 6. A cleaning blade having a cloth body on said ultra-thin blade cleaning blade according to claim 1 and a cleaning blade adapted to detachably attach said ultra-thin blade cleaning blade. Ultra-thin blade squeegee for coating a fabric, a feed / rewind mechanism for feeding a fabric, and a feed roller / roller drive in a cleaning mechanism configured so that a single cleaning blade can be used together with the cleaning mechanism. And a variable feed roller pitch unit, a removable squeegee unit, and a drive unit, and a printing screen cleaning device configured to be detachable from the squeegee unit. 7. A cleaning device in which the non-detachable feed roller controls the driving of the cloths and the feed pitch of the squeegee portion of the replaceable cloth and the squeegee section according to claim 1, and which is detachable by driving the feed roller. An apparatus for cleaning a printing screen configured to drive a blade. 8. A cleaning blade comprising a plurality of cleaning blades each comprising a cleaning blade having a cloth-like body on the cleaning blade of the ultra-thin blade according to claim 1 and a cleaning blade configured to be detachable. single or a plurality of easily exchanged can desorb available-for squeegee unit print screen of a cleaning device formed by a mechanism which can easily replace the cleaning blade unit as a unit as a configuration. 9. A squeegee blade that moves upward or downward and a unit body that moves upward and downward by a one-way clutch that is connected to and driven by a driving mechanism of a vertically moving driving unit that contacts a screen plate of a back surface cleaning device. A rotary roller connected to the one-way clutch which has a mechanism for varying the rotation pitch of the one-way clutch in the drive transmitting means to the one-way clutch which is driven by being connected to the drive of the moving drive unit (feeding means) A roller (pressing roller) for sandwiching a cloth body held in contact with the rotating roller by the roller) to deliver, adhere, and coat the cloth body to the squeegee blade from the cloth body delivery section, and clean the back surface. rear,
The rotating roller is rotated by the lowering of the apparatus, and the cloth body is discharged to the cloth body discharging section at a constant pitch to perform back surface cleaning, and the squeegee surface is driven by driving a vertical driving unit of the back surface cleaning apparatus. A cleaning device for a printing screen, which is configured to be able to renew a cloth body. 10. A squeegee blade which operates upward or downward by a one-way clutch which is connected to and driven by a drive unit of a vertically moving drive unit which is in contact with a screen plate of the back surface cleaning device according to claim 9. And a rotating roller connected to the one-way clutch that has a mechanism for varying the rotation pitch of the one-way clutch during the transmission process to the one-way clutch that is connected to and driven by the drive unit of the up-and-down driving unit ( The cloth body is sent, adhered and covered from the cloth body sending section to the squeegee blade by a pressure roller (pressing roller) that holds the cloth body held in contact with the rotating roller by the feed roller. After cleaning,
The rotating roller is rotated by the lowering of the apparatus, and the cloth body is discharged to the cloth body discharging section at a constant pitch to perform back surface cleaning, and the squeegee surface is driven by driving a vertical driving unit of the back surface cleaning apparatus. In a cleaning device for a printing screen configured to be able to renew the cloth body, a cloth body sent by a pressing roller, a squeegee blade attached to the feeding / discharging portion and the cloth body, It is composed of a side plate or a support member provided with a groove or a mounting plate for supporting both ends in the axial length direction of the above-mentioned components and a driving roller portion and the like, the portion is a replaceable cassette type, other components and The drive unit is configured as a main unit, and updating of the above-described cloth during continuous printing and updating of the main surface of the cloth based on the mechanism of replacing the cloth are possible. A cleaning device of the printing screen are as configured made. 11. The screen plate back surface cleaning device according to claim 9, wherein a part of a connecting portion between the exchangeable cassette portion and the main body unit portion is opened to allow ventilation, and a main body unit portion is provided. A ventilation mechanism is provided on the squeegee blade that is exchangeable as an exhaust mechanism, and air is sucked in from the narrow opening of the squeegee blade protrusion provided in each part of the main body unit to remove the residue from the back surface cleaning from the squeegee blade tip. by air, which is constituted by cassette Tsu preparative method consisting cassette part and the main body unit portion that is possible as construction of the removal and backlog prevention constitute the other mechanism portions and the sealing structure residues to be performed to remove Cleaning device for printing screen.