JPH0939214A - Apparatus and method for cleaning screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and a method that enable the cleaning of a screen by vibrating the screen without damaging the screen or causing contamination of an ultrasonic vibrating member. SOLUTION: Provided below a screen 18 are washing head having a cleaning sheet 710, an ultrasonic vibrator 632, movable and stationary washing agent supplying members 644, 670 and an air jetting member 692. Provided above the screen 18 are wiping head 890 having a wiping sheet 820, a wiping sheet pressing member 860, a squeegee 874 and air jetting member 882. In accordance with the cleaning start conditions, an appropriate cleaning pattern is selected. In a cleaning pattern, the screen 18 is clamped between the cleaning sheet 710 and the wiping sheet 820; a washing agent is supplied to the cleaning sheet 710; vibration is provided by the ultrasonic vibrator 632 to diffuse creamy solder deposited on the screen 18; the solder is wiped out; and the screen 18 is dried by the air jetting members 692, 882.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for cleaning a screen for a screen printing machine, and more particularly to cleaning using a cleaning sheet or a wiping sheet.

[0002]

2. Description of the Related Art In screen printing, a printing material such as a printed circuit board is brought into contact with one surface of the screen, and a printing agent such as cream solder is pressed into a large number of through holes formed in the screen from the other surface side. It is done by Therefore, as the number of prints increases, the printing material contact surface of the screen where the printing material contacts, the printing material pushing surface into which the printing material is pressed, and the printing agent that adheres to the inner peripheral surface of the through hole and becomes dirty, and printing is continued. If it continues, the amount of the printing agent pushed into the through hole will be insufficient and the printing amount will be insufficient, and the printing material will be contaminated. Therefore, for example, when a printing agent is printed on a predetermined number of printing materials, or the amount of the printing agent printed on the printing material is detected, and based on the detection result, stains on the inner peripheral surface of the through hole are detected. When it is estimated that the printing amount is insufficient, the screen is cleaned at the end of screen printing.

As a type of conventional screen cleaning device,
Some screens are cleaned by applying ultrasonic vibrations.
This type of screen cleaning device is generally configured to include an ultrasonic vibration member and a cleaning agent supply device that supplies a cleaning agent between the ultrasonic vibration member and the screen.
The ultrasonic vibrating member is brought into contact with the screen, a cleaning agent is supplied between the ultrasonic vibrating member and the screen, and the screen is vibrated by the ultrasonic vibrating member. As a result, the printing agent adhering to the printing material contact surface of the screen, the printing agent pushing surface, or the inner peripheral surface of the through hole is separated from the screen and diffused into the cleaning agent to be removed.

[0004]

However, in the conventional screen cleaning device, since the ultrasonic vibrating member is brought into direct contact with the screen, the screen is easily scratched. In addition, since the printing agent adheres to the ultrasonic vibration member and the cleaning ability decreases as the number of times of printing increases, the ultrasonic vibration member must be cleaned, which is troublesome. The first aspect of the present invention is directed to obtaining a screen cleaning device capable of cleaning the screen without damaging the screen. Second according to claim 2
An object of the present invention is to obtain a screen cleaning device that allows easy supply of a cleaning sheet and treatment after use, and a third object of the present invention is to clean a screen without damaging both sides. SUMMARY OF THE INVENTION An object of a fourth invention according to claim 4 is to clean a screen contacting surface of a screen on which a printing material comes into contact without damaging the printing material contacting surface. To obtain a screen cleaning device capable of cleaning the screen, and an object of a fifth invention according to claim 5 is to obtain a screen cleaning device capable of cleaning the screen in a mode according to the purpose of cleaning, the time, etc. An object of a sixth invention according to claim 6 is to obtain a screen cleaning device capable of cleaning both surfaces of the screen in a manner according to the purpose of cleaning, the time, etc., Object of a seventh invention according to Motomeko 7,
The purpose is to obtain a screen cleaning device that can automatically perform screen cleaning according to the purpose, time, etc. It is an object of an eighth aspect of the present invention to provide a screen cleaning method capable of cleaning the screen without damaging the screen. An object of a ninth invention according to claim 9 is to obtain a screen cleaning device capable of cleaning the screen without damaging the screen and having a simple structure.

[0005]

In order to solve the above-mentioned problems, a screen cleaning device according to a first aspect of the present invention includes the ultrasonic vibration member and a cleaning agent supply device, and includes the ultrasonic vibration member and the screen. A cleaning sheet holding device that holds the porous cleaning sheet so that it can come into contact with the screen is provided between them, and a cleaning agent supply device is provided at a position for supplying the cleaning agent to the cleaning sheet.

In a second aspect of the invention, the screen cleaning device according to the first aspect of the invention is provided so as to be rotatable about one axis and a belt-shaped cleaning sheet is wound around the supply rotor.
The cleaning sheet feeding device is configured to include a winding rotary member that is rotatably provided around another axis and winds the cleaning sheet, and a rotation drive device that rotationally drives the winding rotary member.

According to a third aspect of the present invention, in the screen cleaning apparatus according to the first aspect, a porous wiping sheet is held on the screen opposite to the ultrasonic vibrating member so as to be able to contact the screen. A wiping sheet holding device is provided.

According to a fourth aspect of the present invention, in the screen cleaning apparatus according to any one of the first to third aspects, the cleaning sheet holding device, the ultrasonic vibration member and the cleaning agent supply device are in contact with the material to be printed on the screen. It is arranged on the printing material contact surface side.

In a fifth aspect of the invention, the screen cleaning apparatus according to any one of the first, second and fourth aspects of the present invention further comprises an ultrasonic vibrating member and a cleaning sheet which contact and separate the cleaning surface of the screen. Contact with sound wave vibration members, etc.
A spacing device, and a relative movement device such as an ultrasonic vibration member that moves at least the ultrasonic vibration member and the cleaning sheet and the screen in a direction parallel to the cleaning surface of the screen,
One of a plurality of preset screen cleaning patterns was selected, and at least an ultrasonic vibration member, a cleaning agent supply device, a contact / separation device such as an ultrasonic vibration member, and a relative movement device such as an ultrasonic vibration member were selected. And a screen cleaning control unit that controls the screen according to the screen cleaning pattern to clean the screen.

In a sixth aspect of the present invention, the screen cleaning apparatus according to the fifth aspect of the present invention further includes a contact / separation device for contacting and separating at least the wiping sheet and the screen, and at least a wiping sheet and the screen. And a relative moving device such as a wiping sheet for relatively moving the screen in a direction parallel to the surface of the screen, and the screen cleaning control means selects one of a plurality of types of screen cleaning patterns, and at least ultrasonic vibration Parts, cleaning agent supply device,
In addition to the contact / separation device such as the ultrasonic vibration member and the relative movement device such as the ultrasonic vibration member, the contact / separation device such as the wiping sheet and the relative movement device such as the wiping sheet are controlled according to the selected screen cleaning pattern. It also includes a wiping sheet control screen cleaning control means for performing cleaning.

In the seventh invention, the fifth invention or the sixth invention
In the screen cleaning apparatus according to the present invention, the screen cleaning control means has a plurality of types of screen cleaning start conditions for starting cleaning of the screen, and a plurality of types of screen cleaning patterns set corresponding to the respective screen cleaning start conditions. When one of the screen cleaning start conditions stored in the storage unit and the screen cleaning start condition stored in the storage unit is satisfied, the ultrasonic vibration member and the like according to the screen cleaning pattern set corresponding to the satisfied screen cleaning start condition. And a cleaning control means when the screen cleaning start condition is satisfied.

In the screen cleaning method according to the eighth aspect of the present invention, the cleaning agent is supplied to the porous cleaning sheet disposed between the screen for the screen printing machine and the ultrasonic vibrating member, and the ultrasonic cleaning is performed on the screen. It is characterized by contacting and cleaning the screen.

A screen cleaning device according to a ninth aspect of the present invention is a screen cleaning device for cleaning a printing material contact surface of a screen for a screen printing machine, which is brought into contact with the printing material, and comprises (a) a strip-shaped wiping sheet. While holding a part of it so that it can contact the printed material contact surface of the screen,
A wipe sheet feeding device for feeding in the longitudinal direction; (b) a pressing device for pressing a part of the wipe sheet against a part of the printing material contact surface; and (c) the screen and at least the pressing device. It is configured to include a relative moving device such as a pressing device that relatively moves the wiping sheet in a direction parallel to the feeding direction.

[0014]

In the screen cleaning device according to the first aspect of the present invention, when the screen is cleaned by using the ultrasonic vibrating member, the ultrasonic vibrating member is brought into contact with the screen through the cleaning sheet and the cleaning agent is applied to the cleaning sheet. Supplied. Then, the cleaning sheet and the screen are vibrated by the ultrasonic vibration member, and the dirt attached to the screen is separated from the screen and diffused into the cleaning agent, and is absorbed and removed by the cleaning sheet. The cleaning agent held on the cleaning sheet is given kinetic energy by vibration and moved to the inside of the through holes of the screen or to the side opposite to the side where the cleaning sheet of the screen is in contact, and the inner peripheral surface of these through holes. The printing agent adhering to the opposite surface or the surface of the opposite side also leaves the screen and diffuses into the cleaning agent to be removed. The cleaning surface of the cleaning sheet, which is brought into contact with the screen, may have a size substantially equal to that of the screen, and may be a surface capable of cleaning the entire screen at the same time. Has a size substantially equal to that of the screen, but the size of the other is shorter than that of the screen, and the cleaning sheet may be moved relative to the screen for cleaning. In this case, it is possible to clean the screen using only the cleaning sheet. A cleaning sheet wipes off the printing agent adhering to the printing material contact surface of the screen and the peripheral edge of the opening of the through hole of the printing material contact surface. Further, the cleaning sheet may be a cut sheet that is cut to form a cleaning surface as a whole, or may be a band-shaped sheet having a band shape and a part of the cleaning surface. Further, the screen cleaning device may be provided in the screen printing machine or may be provided separately from the screen printing machine.

In the screen cleaning device according to the second aspect of the invention, a strip-shaped sheet is used as the cleaning sheet. The cleaning surface of the cleaning sheet that contacts the screen and cleans the screen may be approximately the same size as the screen or may be smaller than the screen. In any case, if the cleaning sheet is contaminated with the printing agent, the cleaning sheet feeding device feeds the contaminated portion and replaces it with a clean portion.

In the screen cleaning device according to the third aspect of the present invention, one surface of the screen is cleaned with the cleaning sheet and the other surface is cleaned with the wiping sheet. The surface to be cleaned by the cleaning sheet may be the surface to be contacted with the printing material or the surface to press the printing material, and the cleaning sheet and the wiping sheet may be cleaned from the same position on both sides of the screen at the same time. Alternatively, cleaning may be performed at different times.
In any case, stains such as the printing agent that have spread from the screen due to ultrasonic vibrations and diffused into the cleaning agent are absorbed and captured by the cleaning sheet on one side, and the cleaning agent and the wiping sheet on the other side. Wiped off. The wiping surface of the wiping sheet, which comes into contact with the screen, may be of almost the same size as the screen, and may be a surface capable of wiping the entire screen at the same time, and in either the printing direction of the screen or the width direction perpendicular thereto. May have a dimension that is approximately equal to the screen, but on the other hand it may have a dimension that is shorter than the screen. In the latter case, the wiping sheet is moved relative to the screen and wiped off. Further, the wiping sheet may be a cut sheet that is cut and entirely constitutes the wiping surface, or may be a belt-shaped sheet that forms a strip shape and a part thereof constitutes the wiping surface.

In the screen cleaning device according to the fourth aspect of the present invention, the cleaning sheet holding device, the ultrasonic vibration member and the cleaning agent supply device are arranged on the contact surface side of the printing material, and the screen is made of the cleaning sheet and the printing material is It is cleaned from the contact surface side. Therefore, it is not necessary to retract the printing agent to a position where it does not come into contact with the ultrasonic vibration member during cleaning, the printing agent is directly placed on the screen, and the printing agent is moved on the screen by the movement of the squeegee while the through hole is formed. A screen cleaning device suitable for cleaning the screen of a screen printing machine that is pushed into the screen is obtained. In many cases, the screen is arranged horizontally, with the upper surface serving as the printing material pressing surface and the lower surface serving as the printing material contact surface. In this case, if you try to clean the screen by directly supplying the cleaning agent to the screen from the contact side of the printing material, the cleaning agent drips and wastes a lot of the cleaning agent. If the cleaning agent is supplied to the sheet, the cleaning agent is absorbed by the cleaning sheet even if the cleaning agent is supplied from below the screen.
Less likely to be retained and drip. Therefore, it is possible to clean the screen from the contact surface of the material to be printed with less waste of the cleaning agent, and in a screen printing machine in which the printing agent is directly placed on the screen and printing is performed, the printing agent can be quickly swept without retracting the printing agent. Can be cleaned.

In the screen cleaning device according to the fifth aspect of the present invention, at least the ultrasonic vibration member, the cleaning sheet and the screen are automatically brought into contact with each other and separated from each other by the screen cleaning control means, and relatively moved.
Cleaning is done automatically. The cleaning agent supply device may or may not be in contact with the screen via the cleaning sheet, and the contact / separation device such as the ultrasonic vibration member is at least the ultrasonic vibration member and the cleaning surface of the cleaning sheet and the screen. Anything can be used as long as it contacts and separates.
The screen cleaning control means may control a wiping sheet feeding device, a cleaning sheet feeding length adjusting device, and a wiping sheet feeding length adjusting device, which will be described later.

The screen cleaning pattern uses, for example, an ultrasonic vibration member, a cleaning agent supply device and a cleaning sheet, and a pattern for performing cleaning in a short time, an ultrasonic vibration member, a cleaning agent supply device and a cleaning sheet, The pattern includes a pattern for performing cleaning for a long time, a pattern for performing cleaning in a short time using only a cleaning sheet, and a pattern for performing cleaning using a wiping sheet in addition to the cleaning sheet. The cleaning time becomes shorter as the relative moving speed between the ultrasonic vibration member and the screen is higher. This relative movement speed, during one screen cleaning,
It may be constant or may be changed. When changing, it may be changed continuously or may be changed stepwise.
When cleaning the same type of screen a plurality of times, it is possible to obtain a plurality of types of speed patterns by multiplying a preset speed pattern by a positive coefficient for each cleaning. The coefficient to be multiplied is 1
The higher the speed, the faster the cleaning time.
"The relative movement speed is high" is not limited to the case where the relative movement speed is constant and high, but the relative movement speed is changed and partially increased during one screen cleaning, and the average movement speed is increased. Including the case of doing so. The relative movement speed can be set based on various relative movement speed setting factors such as the reason why the screen is cleaned, the size of the through holes in the screen and the formation density. In the above exemplary screen cleaning pattern, at least one of the cleaning execution elements such as the ultrasonic vibration member, the cleaning agent supply device, the cleaning sheet, and the wiping sheet, and the speed pattern including at least one relative movement speed The cleaning pattern is set by the combination.

As described in claim 7, the screen cleaning pattern may be stored in the storage means in association with the screen cleaning start condition and automatically selected, or selected by the operator. You may do it. The selection by the operator may be performed, for example, by arbitrarily combining a cleaning mode pattern and a speed pattern of which of a plurality of cleaning execution elements is used to perform cleaning, and the selection is performed in advance. It may be performed by instructing one of the screen cleaning patterns stored in the pattern storage means. Whether the screen cleaning pattern is automatically selected or selected by the operator, it is possible to provide cleaning condition changing means that allows the operator to change a part of the selected screen cleaning pattern according to the situation. Is. The cleaning condition changing means inputs, for example, at least one of use cleaning execution element designating data for instructing which of the plurality of cleaning execution elements is used for cleaning and speed data for instructing relative movement speed. It is supposed to include an input means for obtaining.
Further, the cleaning sheet feeding device may be controlled by the screen cleaning control means. In this case, the screen cleaning pattern is set by using the cleaning sheet feeding device as the cleaning execution element. For example, the cleaning sheet may be sent once for each screen cleaning as described in the embodiment section. Alternatively, cleaning may be performed while feeding, and different screen cleaning patterns can be obtained by changing the feeding timing, feeding amount, and the like.

In the screen cleaning device according to the sixth aspect of the invention, a screen cleaning pattern is set in which a wiping sheet is added as a cleaning execution element. If the screen cleaning pattern using the wiping sheet is selected, cleaning is performed using the wiping sheet.

In the screen cleaning apparatus according to the seventh aspect of the present invention, when the screen cleaning start condition is satisfied, a screen cleaning pattern is automatically selected and cleaning is automatically performed according to the screen cleaning pattern. The screen cleaning start condition includes, for example, the end of screen printing, the end of use of the screen, the suspension of screen printing, the end of screen printing of a certain number of sheets, the operator's instruction, the determination of cleaning execution based on the detection result of the print state, the screen. The reading of the reference mark provided in the. One screen cleaning pattern may be set for each cleaning start condition, or a plurality of screen cleaning patterns may be set. For example, when cleaning is performed because the print result is poor, a high-speed screen cleaning pattern that uses an ultrasonic cleaning member, a cleaning sheet, a cleaning agent supply device, and a wiping sheet, and relatively moves them with the screen at high speed And a low-speed screen cleaning pattern for relatively moving at low speed are set, and when it is determined that the print result is bad, the high-speed screen cleaning pattern is first selected, and immediately after the execution of the high-speed screen cleaning pattern. The low speed screen cleaning pattern is selected when it is determined that the result of the printing state detection performed in step 1 is defective again. Alternatively,
Normally, the high speed cleaning pattern is selected, but it is also possible to select the low speed screen cleaning pattern when the time interval at which it is determined that the print result is bad is less than or equal to the set interval. is there. The storage means is a ROM,
It is composed of a backup RAM and a non-volatile memory such as an external storage device. The external storage device can be detached from, for example, a device that is non-removably provided in the control device that constitutes the screen cleaning control means, or a reading device that is non-removably provided in the control device and a reading device such as a magnetic disk or an optical disk. Storage device.

In the screen cleaning method according to the eighth aspect, the ultrasonic vibration member is brought into contact with the screen through the cleaning sheet, the cleaning agent is supplied to the cleaning sheet and ultrasonically vibrated, and adheres to the screen. Dirt disperses away from the screen into the cleaning material and is removed.

In the screen cleaning device according to the ninth aspect of the present invention, the wiper sheet is brought into contact with the printing material contact surface of the screen by the pressing device, and the pressing device and the screen are moved relative to each other, whereby The entire printing material contact surface is wiped off by the wiping sheet. For example, if the printing agent pressed into the through hole of the screen is easily separated from the inner peripheral surface of the through hole and almost no printing agent remains on the inner peripheral surface of the through hole, it is sufficient to wipe off the printing agent attached to the contact surface of the printing material. Or, if the through-hole is large and the wiping sheet can penetrate the through-hole and wipe the inner peripheral surface of the through-hole when the wiping sheet moves relative to the screen, the wiping sheet can be used to wipe the inner surface of the through-hole. Only wiping is sufficient to put the screen into a state in which the printing material can be printed without any shortage. As described in the embodiments of the invention, the wiping sheet is provided with a length that opposes a part of the printing material contact surface of the screen, and the opposing portion is brought into contact with the printing material by a pressing device. The wiping sheet feeding device may be moved relative to the screen together with the pressing device by being pressed against the surface, or the wiping sheet feeding device may be arranged with a length facing the entire contact surface of the printing material, and A part may be pressed against the printing material contact surface by the pressing device, and cleaning may be performed by moving the pressing device with respect to the screen. Further, the wiping sheet is wound around the supply shaft to form a roll, and the portion used for cleaning is wound up by the winding shaft so that the used portion is not reused. Well, or by winding an endless annular wiping sheet around a drive shaft and a driven shaft that are rotatably arranged in parallel with each other, and rotating the drive shaft to circulate the wiping sheet, The collecting sheet may be used multiple times. Further, the relative moving speed between the pressing device and the screen may be changed depending on the case. For example, when the through hole of the screen is small and it is difficult to wipe off the printing agent remaining on the peripheral edge of the opening of the through hole, the relative moving speed is lowered, and when the through hole of the screen is large, the relative moving speed is increased. Alternatively, the higher the density of the through holes, the lower the relative moving speed may be. This relative movement speed can be set in various modes such as constant or changing during one screen cleaning as in the case of cleaning the screen using the cleaning sheet.

[0025]

As described above, according to the first aspect of the present invention, when cleaning is performed using the ultrasonic vibration member, the ultrasonic vibration member is applied to the screen via the cleaning sheet, so that the screen is damaged or the ultrasonic vibration is generated. It is possible to obtain a device capable of cleaning the screen while satisfactorily avoiding contamination of the member. Further, since the cleaning sheet holds the cleaning agent and absorbs and captures the dirt diffused in the cleaning agent by the ultrasonic vibration, the cleaning agent is supplied and the cleaning agent is removed in parallel, and both are performed separately. The amount of cleaning agent used is smaller than that required.

Further, the screen cleaning device according to the present invention can be installed in a screen printing machine, and in this case, the screen can be cleaned while being attached to the screen support member. Since it is not necessary to attach or remove the screen during cleaning, the time for interrupting printing for cleaning can be shortened, and it is easy to automate screen printing including cleaning of the screen. If the screen cleaning device is provided separately from the screen printing machine and the screen needs to be removed from the screen support member of the screen printing machine for cleaning, it is necessary to remove the screen and replace the screen to be cleaned with a clean screen. When the is mounted on the screen support member, the positioning of the screen is necessary, the interruption time of printing is long, and automation is difficult. On the other hand, if you clean the screen with it attached to the screen support member,
It is not necessary to attach or detach the screen or to position the screen, the print interruption time can be shortened, and the screen cleaning can be easily automated. Further, the ultrasonic vibrating member does not become dirty as in the case where the ultrasonic vibrating member is brought into direct contact with the screen, the screen printing does not have to be interrupted for cleaning the ultrasonic vibrating member, and the continuous operation for a long time is not required. Printing is possible.

According to the second aspect of the invention, since the cleaning sheet has a strip shape, the cleaning sheet is wound around the supply rotary member and collectively mounted, and the used cleaning sheet is wound around the winding rotary member and collectively processed. The cleaning sheet can be easily attached and processed. In addition, since the cleaning sheet with dirt attached is wound around the take-up rotary member, the dirt attached to the cleaning sheet does not easily adhere to the components of the screen cleaning device or the screen printing machine, and it is not necessary to clean those members. it can.

According to the third aspect, since the surface of the screen opposite to the surface cleaned by the cleaning sheet is wiped off by the wiping sheet, both sides of the screen can be cleaned together. When the screen printing machine in which the screen is cleaned by the screen cleaning device is one in which the printing agent is contained in the container and is extruded from the container and printed on the material to be printed, as described in the example section. In this case, since the printing agent does not remain after the container is separated from the screen, the screen can be sandwiched and cleaned by the cleaning sheet and the wiping sheet. However, even in a screen printing machine in which the printing agent is placed directly on the screen and printing is performed by moving the squeegee, by retracting the printing agent to a position outside the printing area where the through holes are formed during cleaning, The cleaning area and the wiping sheet can clean the print area of the screen from both sides.

According to the fourth aspect of the invention, since the cleaning sheet holding device or the like is disposed on the side of the printing material contact surface, it is possible to clean the printing material contact surface, which greatly affects the quality of printing when it becomes dirty. You can According to the fifth aspect of the present invention, it is possible to obtain the screen cleaning device in which the cleaning of the screen using the cleaning sheet is automatically performed with a plurality of different screen cleaning patterns. Cleaning is performed in a pattern suitable for each case where the screen needs to be cleaned, and the screen can be effectively cleaned. According to the sixth aspect of the invention, there is further provided a screen cleaning device in which screen cleaning is automatically performed by one of a plurality of screen cleaning patterns including a screen cleaning pattern using a wiping sheet.

According to the seventh aspect of the invention, a screen cleaning device can be obtained in which a screen cleaning pattern is automatically selected and cleaning is automatically performed. If this screen cleaning device is provided in a screen printing machine, full automation of screen printing including cleaning of the screen can be realized very easily. Unless the screen cleaning pattern is selected automatically, it is necessary for the operator to select the pattern and full automation is not possible. According to the eighth aspect of the present invention, it is possible to obtain a screen cleaning method capable of cleaning the screen without damaging the screen or soiling the ultrasonic vibration member.

According to the ninth aspect of the invention, it is possible to obtain a screen cleaning device which can be cleaned without damaging the screen and which has a simple structure because the ultrasonic vibrating member and the cleaning agent supply device are not used. . Further, if the wiping sheet is brought into contact with the printing material contact surface of the screen in an area smaller than the printing material contact surface, the amount of the wiping sheet used per cleaning is small, and the amount of the wiping sheet used is small. Therefore, cleaning can be performed at low cost without reusing the used part. The cleaning cost can also be reduced by circulating the endless annular wiping sheet and using it a plurality of times.

[0032]

Preferred Embodiments of the Invention The present invention can be carried out not only in the embodiments described in the above claims but also in the following embodiments. The embodiments are conveniently described as an embodiment of the same type as the claims. (1) The screen according to any one of claims 1 to 4, including at least a contact / separation device for contacting and separating the ultrasonic vibration member and the cleaning sheet from the cleaning surface of the screen. Cleaning device. In the apparatus of this embodiment, the cleaning agent supply device may be brought into contact with or separated from the cleaning surface of the screen together with the ultrasonic vibration member and the cleaning sheet, or may not be brought into contact with or separated from the cleaning surface. The cleaning agent may be supplied in a state where the ultrasonic vibration member and the cleaning sheet are in contact with the cleaning surface, or may be supplied in a separated state. (2) A relative moving device such as an ultrasonic vibration member for relatively moving at least the ultrasonic vibration member and the screen in a direction parallel to the cleaning surface.
The screen cleaning device according to any one of 1. In the apparatus of this embodiment, the cleaning surface of the cleaning sheet, which is brought into contact with the screen, may have a size such that it contacts the entire screen or a part thereof. Further, the cleaning sheet may be cut and may be a cut sheet that entirely constitutes the cleaning surface, or may be a belt-shaped sheet that is in the form of a belt and each part thereof sequentially constitutes the cleaning surface. When the cleaning surface has a size that can contact the entire screen, the cleaning sheet and the screen and the ultrasonic vibration member are relatively moved to clean the cleaning surface. When the cleaning surface is sized to contact a part of the screen, the screen, the cleaning sheet and the ultrasonic vibration member are moved relative to each other. The cleaning agent supply device may be configured to supply the cleaning agent to the cleaning sheet while being moved together with the ultrasonic vibration member. It may be supplied. If the cleaning surface of the cleaning sheet is smaller than the screen,
A small cleaning sheet can be used to clean one screen, so that the cleaning cost can be kept low and the cleaning efficiency can be improved by the cleaning action of the screen by the cleaning sheet. (3) The relative moving device such as the ultrasonic vibrating member moves the ultrasonic vibrating member and the like during screen cleaning,
6. A moving device, such as an ultrasonic vibrating member, which is moved to a retracted position off the screen during screen printing.
7. A screen cleaning device according to any one of item 2 of the embodiment. The screen cleaning device of this embodiment is attached to a screen printing machine, and the ultrasonic vibration member and the like are moved to a retracted position during screen printing so as not to interfere with printing. The ultrasonic vibration member or the like is moved to the retracted position by using a moving device for cleaning. (4) A cleaning sheet replacement device that replaces at least a portion of the cleaning sheet located between the ultrasonic vibration member and the screen is included.
The screen cleaning device according to any one of 3 to 3. In the apparatus of this embodiment, the cleaning sheet soiled by cleaning is replaced with a clean cleaning sheet. If the cleaning sheet is a cut sheet, the dirty cleaning sheet is replaced with another clean cleaning sheet, and if the cleaning sheet is a belt-like sheet, the cleaning sheet is fed by the cleaning sheet feeding device and the clean portion of the cleaning sheet becomes dirty. It is located between the ultrasonic vibrating member and the screen instead of the open portion. The replacement and feeding of these cleaning sheets are the replacement of cleaning sheets. In any case, the cleaning sheet is inexpensive, and as in the case of cleaning by directly contacting the ultrasonic vibrating member with the screen, the screen is damaged and becomes useless, or the dirty ultrasonic vibrating member is cleaned. Cleaning costs are lower than when equipment is needed. (5) The cleaning agent supply device is provided upstream of the ultrasonic vibration member in the feeding direction of the cleaning sheet.
To 7, the screen cleaning device according to any one of the first to fourth embodiments. In the apparatus of this embodiment, the cleaning agent can be supplied to the cleaning sheet at the same time as the feeding, and cleaning can be performed quickly. (6) The cleaning agent supply device is provided on the downstream side of the ultrasonic vibration member in the feeding direction of the cleaning sheet.
To 7, the screen cleaning device according to any one of Embodiments 1 to 5. If the cleaning agent supply device is provided only on the downstream side of the ultrasonic vibration member in the cleaning sheet feeding direction, the downstream side portion in the cleaning sheet feeding direction is wetted by the cleaning agent, while the upstream side portion is dry. If the cleaning sheet is moved with respect to the screen in the same direction as the cleaning sheet feeding direction during cleaning, the screen is washed in the portion of the cleaning sheet containing the cleaning agent, and the cleaning sheet is cleaned. The part can be wiped off by the dry part of the cleaning sheet, and one surface of the screen can be washed and wiped at once. If the cleaning agent supply device is provided on the upstream side and the downstream side of the ultrasonic vibrating member in the feeding direction of the cleaning sheet, even during cleaning
By supplying the cleaning agent to the cleaning sheet by one cleaning agent supplying device, it becomes easy to keep the entire cleaning sheet in a state in which sufficient cleaning agent is held. (7) The screen cleaning device according to any one of claims 1 to 7 and embodiments 1 to 6, wherein the cleaning agent supply device is provided on the same side as the ultrasonic vibration member with respect to the cleaning sheet. In the device of this embodiment, the cleaning agent supply device and the ultrasonic vibration member can be provided together, and the screen cleaning device can be made compact. (8) The cleaning agent supply device includes a cleaning agent supply member, a cleaning agent supply source that supplies a cleaning agent to the cleaning agent supply member, and a cleaning agent supply member that is the ultrasonic vibration member with respect to the cleaning sheet. And a cleaning agent supply member holding device for movably holding the pressing position for contacting the cleaning sheet and pressing the cleaning sheet against the ultrasonic vibrating member, and the releasing position for releasing the cleaning sheet on the side opposite to the cleaning sheet. 1 to 7, embodiment item 1
The screen cleaning device according to any one of to 7. In the apparatus of this embodiment, the cleaning sheet is pressed against the ultrasonic vibration member, the vibration is reliably transmitted to the screen through the cleaning sheet, and the attached printing agent is satisfactorily removed. Further, the cleaning agent supply member has the cleaning agent supply function and the cleaning sheet pressing function, and the apparatus can be configured easily and inexpensively as compared with the case where the cleaning sheet pressing member is separately provided. (9) The screen cleaning device according to any one of claims 1 to 7 and embodiments 1 to 8, including a cleaning sheet side surface drying device that dries a surface of the screen cleaned by the cleaning sheet. Screen cleaning device. (10) The cleaning sheet side drying device is downstream of the contact portion between the cleaning sheet and the screen in the relative movement direction with respect to the screen during cleaning of the ultrasonic vibration member, with respect to the screen together with the ultrasonic vibration member. The screen cleaning device according to item 9, which is provided so as to be relatively movable. In the apparatus of this embodiment, the screen is dried by the cleaning sheet side drying device when the ultrasonic vibration member is returned to the cleaning start position. Conversely, it is possible to install a cleaning sheet side drying device on the upstream side of the contact portion between the cleaning sheet and the screen in the direction of relative movement with respect to the screen during cleaning of the ultrasonic vibration member. Then, it will be dried. (11) Embodiment 9 or 1 in which the cleaning sheet side drying device includes an air ejecting member for ejecting air to the screen.
The screen cleaning device according to 0. In each of the embodiments 9 to 11, the cleaning sheet side surface drying device may be controlled by the screen cleaning control means. in this case,
The screen cleaning pattern is set with the cleaning sheet side drying device as the cleaning execution element, and if the screen cleaning pattern including the operation of the cleaning sheet side drying device is selected,
Cleaning, including screen drying, is performed. (12) The screen cleaning device according to any one of claims 3 to 7 and embodiments 1 to 11, wherein the screen cleaning device includes a pressing member that elastically presses the wiping sheet against the screen. (13) The screen cleaning device according to embodiment 12, wherein the pressing member is provided at a position facing the ultrasonic vibration member with the wiping sheet, the screen, and the cleaning sheet interposed therebetween. In the device according to this embodiment, the wiping sheet is pressed against the screen by the pressing member, and the cleaning sheet is pressed against the ultrasonic vibration member by the pressing member via the screen and the wiping sheet, so that the cleaning sheet and the screen are securely attached. Vibrated. In each of the devices of the twelfth and thirteenth embodiments, the pressing and releasing of the wiping sheet onto the screen by the pressing member may be controlled by the screen cleaning control means so that the pressing is automatically performed. In this case, the screen cleaning pattern is set with the pressing member as the cleaning execution element,
If the screen cleaning pattern including the operation of the pressing member is selected, the cleaning including the pressing of the wiping sheet onto the screen by the pressing member is performed. (14) The screen cleaning device according to any one of claims 3 and 4 and embodiments 1 to 13, including at least a contacting / separating device for contacting and separating the wiping sheet and the screen from each other. . (15) A relative moving device such as a wiping sheet that relatively moves at least the wiping sheet and the screen in a direction parallel to the surface of the screen.
14. The screen cleaning device according to any one of 14. In the apparatus according to this embodiment, the wiping sheet and the screen are slid to efficiently perform the wiping, and the wiping surface of the wiping sheet brought into contact with the screen is sized to come into contact with part of the screen. The wiping sheet used for cleaning one screen can be small, and the cleaning cost can be kept low. (16) The relative moving device such as the wiping sheet is a moving device such as the wiping sheet that moves the wiping sheet or the like with respect to the screen when cleaning the screen, and moves the wiping sheet or the like to a retracted position off the screen during screen printing. The screen cleaning device according to any one of claims 6 and 7 and embodiment 15. The screen cleaning device of this embodiment is attached to a screen printing machine, and the wiping sheet or the like is moved to a retracted position during screen printing so as not to interfere with printing. The wiping sheet or the like is moved to the retreat position by using a moving device for cleaning. (17) The wiping sheet is relatively immovable in a squeegee moving direction with respect to a squeegee that pushes a printing agent into the through hole of the screen, and a squeegee moving device that moves the squeegee is the wiping sheet moving device. 17. The screen cleaning device according to item 16, which also serves as a screen cleaning device. According to the device of this embodiment, a dedicated moving device for moving the wiping sheet or the like is unnecessary, and the device cost can be reduced. (18) Embodiment 16 or 17 including a synchronizing device for synchronizing the movement of the ultrasonic vibration member or the like by the moving device of the ultrasonic vibration member or the like and the movement of the wiping sheet or the like by the moving device of the wiping sheet or the like Screen cleaning device according to. The synchronizing device may mechanically connect the ultrasonic vibrating member and the like to the wiping sheet or the like as in the device of the nineteenth embodiment, or a moving device and a wiping device that moves the ultrasonic vibrating member and the like. Each drive source for the moving device for moving the seat or the like may be configured by an electric motor, and may be electrically synchronized by controlling the rotation of the electric motor. (19) The synchronizing device includes a connecting device that connects the ultrasonic vibration member and the like and the wiping sheet and the like, and the wiping sheet moving device and the ultrasonic vibration member moving device are combined. 19. The screen cleaning device according to embodiment 18.
In the device of this embodiment, the wiping sheet and the like and the ultrasonic vibrating member and the like are moved by a common moving device, and the device can be configured simply and at low cost. When the squeegee moving device also serves as a moving device such as a wiping sheet, the squeegee moving device also serves as a moving device such as an ultrasonic vibrating member, so that the device can be configured extremely simply and inexpensively. In each of the devices of the embodiment varieties 18 and 19, the synchronizing device may be controlled by the screen cleaning control means. In this case, the screen cleaning pattern is set with the synchronization device as the cleaning execution element. For example, when the screen cleaning is performed by using only the cleaning sheet, the synchronization device does not operate and the wiping sheet is not moved and only the cleaning sheet is used. Can be moved, and conversely, only the wiping sheet can be moved to clean the screen. (20) The screen cleaning device according to any one of claims 1 to 7 and embodiments 1 to 19, wherein the screen cleaning device includes a scraping member that slides on the screen to scrape off a printing agent on the screen. Screen cleaning device. (21) The screen cleaning device according to embodiment 20, wherein the scraping member is provided on the opposite side of the wiping sheet from the screen. In the device of this embodiment,
Since the scraping member scrapes off the printing agent adhered to the screen through the wiping sheet, for example, even if the scraping member is made of metal, the screen is not scratched and the printing agent is scraped off satisfactorily. be able to. (22) The screen cleaning according to embodiment 20 or 21, wherein the scraping member is provided on a downstream side of a contact portion between the wiping sheet and the screen in a relative movement direction of the wiping sheet during wiping. apparatus. In each of the embodiments 20 to 22, the screen cleaning control means may control the scraping of the printing agent by the scraping member so that the scraping is automatically performed. in this case,
In the cleaning pattern, the scraping member is also set as one of the cleaning performing elements. (23) The screen cleaning device according to any one of claims 3 to 7 and embodiments 1 to 22, including a wiping sheet replacing device that replaces at least a portion of the wiping sheet that comes into contact with the screen. In the device of this embodiment,
The cleaning sheet soiled by cleaning is replaced with a clean cleaning sheet. If the wiping sheet is a cut sheet, the dirty wiping sheet is replaced with another clean wiping sheet, and if the wiping sheet is a strip-shaped sheet, the wiping sheet is wiped as in the apparatus of the embodiment 24. The clean sheet feeding device feeds the clean portion of the wiping sheet in place of the dirty portion to bring it into contact with the screen. Replacing and feeding these wiping sheets is the replacement of wiping sheets. (24) The wiping sheet is a belt-shaped sheet, and the wiping sheet replacement device is rotatable about one axis and is rotatable around another axis and a supply rotary body around which the wiping sheet is wound. 24. The screen cleaning device according to embodiment 23, further comprising a wiping sheet feeding device that is provided in a winding rotary body that winds the wiping sheet, and a rotation drive device that rotationally drives the winding rotary body. Embodiment 23, 2
In each device of No. 4, the wiping sheet replacement device is controlled by the screen cleaning control means, and at the start of cleaning, during cleaning,
The wiping sheet may be replaced at a preset time such as at the end of cleaning. In this case, the screen cleaning pattern is
The wiping sheet replacement device is set as the cleaning execution element. (25) The screen cleaning device includes a wiping sheet side surface drying device that dries a surface of the screen wiped by the wiping sheet.
The screen cleaning device according to any one of 24. (26) The wiping sheet side drying device according to embodiment 25, wherein the wiping sheet side drying device is provided on an upstream side of a contact portion between the wiping sheet and the screen in a relative movement direction of the wiping sheet or the like during wiping. Screen cleaning device. (27) The screen cleaning device according to item 25 or 26, wherein the wiping sheet side surface drying device includes an air ejecting member that ejects air toward the screen. In each of the twenty-fifth to twenty-seventh embodiments, the wiping sheet side drying device may be controlled by the screen cleaning control means so that the surface of the screen on the side wiped by the wiping sheet is automatically dried. . In this case, the screen cleaning pattern is set with the wiping sheet side drying device as the cleaning execution element, and if the screen cleaning pattern including the operation of the wiping sheet side drying device is selected, the screen is dried by the wiping sheet side drying device. To be made. (28) The screen according to any one of claims 2 to 7 and embodiments 1 to 27, wherein the cleaning sheet feeding device includes a cleaning sheet feeding length adjusting device that adjusts the feeding length of the cleaning sheet. Cleaning device. The feed length of the cleaning sheet is adjusted, for example, according to the winding diameter of the cleaning sheet wound around the winding rotating body, as described in the embodiment of the invention. When the portion of the cleaning sheet located between the ultrasonic vibrating member and the screen is replaced by a plurality of feeding operations of the cleaning sheet feeding device, if the winding diameter is increased, the winding operation is performed by one feeding operation. The amount increases. Therefore, when the winding diameter increases, the feed length is adjusted by reducing the feed number or by decreasing the rotation angle of the winding rotary member during one feeding operation without changing the feed number. It can be replaced by the required length. When the portion of the cleaning sheet located between the ultrasonic vibration member and the screen is replaced by one feeding operation of the cleaning sheet feeding device, the rotation angle of the winding rotary member at the time of feeding increases as the winding diameter increases. Is adjusted so that the feed length becomes constant. The same applies to the case where the feed length of the wiping sheet is adjusted as in the apparatus according to item 29. (29) The screen cleaning device according to any one of items 24 to 28, wherein the wiping sheet feeding device includes a wiping sheet feeding length adjusting device that adjusts a feeding length of the wiping sheet. (30) The screen cleaning device according to any one of claims 1 to 7 and embodiments 1 to 29, wherein the cleaning sheet includes paper having hygroscopicity. (31) The screen cleaning device according to any one of claims 3 to 7 and embodiments 1 to 30, wherein the wiping sheet includes paper having a hygroscopic property. The cleaning sheet and the wiping sheet are not limited to those formed of only paper, and may be reinforced by mixing a reinforcing material in the paper, or formed separately from the paper, but sent together with the paper. It may be provided with a reinforcing material that reinforces the paper. Paper is cheap,
It is possible to reduce the cost required to replace the dirty portion of the cleaning sheet or the wiping sheet. (32) The screen cleaning pattern is a simple cleaning pattern that cleans the screen using only the cleaning sheet, and a screen that is normally cleaned using the ultrasonic vibration member, the cleaning agent supply device, and the cleaning sheet. Claims 5 to 7, including the cleaning pattern, Embodiments 1 to 31
The screen cleaning device according to any one of 1. For example,
The through hole formed in the screen is large, and as in the case where the printing agent pressed into the through hole sticks out from the through hole and adheres to the printing material side opening peripheral edge opposite to the pressing side opening of the through hole, It may be sufficient to clean the contact surface of the material to be printed with only the cleaning sheet. (33) The screen cleaning method according to claim 8, further comprising moving the ultrasonic vibration member and the cleaning sheet along a surface of the screen to clean the screen. (34) The screen cleaning method according to claim 8 or claim 33, wherein the surface of the screen opposite to the surface cleaned by the cleaning sheet is wiped off by a wiping sheet. (35) The pressing device is configured integrally with the wiping sheet feeding device, and a wiping sheet contact for contacting and separating the wiping sheet and the pressing device with the printed material contact surface of the screen The screen cleaning device according to claim 9, further comprising a spacing device. (36) The screen cleaning device according to claim 9 or claim 35, wherein the pressing device includes a pressing roller rotatably provided around an axis perpendicular to the feeding direction of the wiping sheet. (37) The wiping sheet feeding device includes a wiping sheet feeding length adjusting device that adjusts a feeding length of the wiping sheet. Screen cleaning device.

[0033]

BEST MODE FOR CARRYING OUT THE INVENTION A screen printing machine equipped with a screen cleaning device, which is an embodiment common to each of the first to seventh inventions and in which the method according to the eighth invention is implemented, will be described with reference to the drawings. The details will be described. The control of the contact load of the squeegee on the screen and the printing of the cream solder on the printed circuit board in this screen printing machine are described in JP-A-8-
This is performed in the same manner as in the screen printing machine described in Japanese Patent No. 48024. In FIG. 1, reference numeral 10 denotes a base. On the base 10, a board conveyer 14 for carrying a printed board 12 as a material to be printed, a board supporting lifting device 16 for supporting and lifting the printed board 12 carried by the board conveyor 14, a board supporting lifting device 16 A substrate pressing device (not shown) that presses the printed circuit board 12 when supporting the printed circuit board, a screen positioning support device 20 (see FIG. 3) that supports the screen 18, and a printing that prints a cream-like solder, which is a kind of printing agent, on the printed circuit board 12. Device 2
2, a screen cleaning device 24 for cleaning the screen 18
Is provided.

The substrate conveyor 14 is, as shown in FIG.
It has a fixed rail 30 which is provided with its position fixed, and a movable rail 32 which is provided in parallel with the fixed rail 30 and is capable of approaching and separating. An endless chain (not shown) is attached to each of the fixed rail 30 and the movable rail 32 along the longitudinal direction, the printed circuit board 12 is placed on these chains, and the chain is moved by a chain drive device (not shown). By being transported, it is transported. The distance between the fixed rail 30 and the movable rail 32 is adjusted according to the size of the printed circuit board 12.

The carry-in conveyor 34 (see FIG. 23) for carrying the printed board 12 into the board conveyor 14 is located upstream of the board conveyor 14 in the direction in which the printed board 12 is conveyed.
And a carry-out conveyor 36 (see FIG. 23) for carrying out the printed circuit board 12 from the board conveyor 14 is provided on the downstream side.

The substrate support lifting device 16 is shown in FIGS.
As shown in FIG. 3, the board support base 40 is provided below the printing device 22 and is vertically movable through a space between the fixed rail 30 and the movable rail 32. The substrate support base 40 sucks and supports the printed circuit board 12 by a negative pressure.
And a raised end position where the printed circuit board 12 contacts the lower surface of the screen 18 are raised and lowered. The dimension of the substrate support base 40 in the direction perpendicular to the substrate transport direction in the horizontal plane can be adjusted according to the width of the printed circuit board 12. A substrate pressing device (not shown) is provided between the substrate conveyor 14 and the screen positioning and supporting device 20.

The screen 18 is in the form of a thin plate and has a large number of through holes penetrating in the thickness direction. The screen 18 is supported by the screen frame 50, and the screen positioning support device 20 is connected to the screen frame 5 by the screen positioning support device 20.
A screen support base 52 that supports 0 is provided. The screen support 52 has a plate-like shape and is fixed on four columns 54 standing on the base 10. As shown in FIG. 2, an opening 56 penetrating in the thickness direction is formed in the screen support base 52, and the screen frame 50 is supported by the peripheral portion of the opening 56 of the screen support base 52.

As shown in FIG. 3, the screen support base 52
Projections 58 are respectively provided along both edges perpendicular to the substrate transporting direction, and one of the projections 58 sets the position of the screen 18 in the X-axis direction parallel to the substrate transporting direction. An axial position setting device 60 is provided, and the other protrusion 58 is provided.
Is provided with an X-axis direction moving device 62 that moves the screen frame 50 to the position set by the X-axis direction position setting device 60. On the screen support base 52, a pair of Y-axis direction position setting devices 61 that determine the position of the screen frame 50 in the Y-axis direction perpendicular to the substrate transport direction and the Y-axis that presses the screen frame 50 against the Y-axis direction position setting device 61. A direction moving device 63 is provided. Screen support 5
Also, four screen fixing devices 64 are provided on the screen 2, and the screen frame 50 positioned by the position setting devices 60 and 61 and the moving devices 62 and 63 in the X-axis direction and the Y-axis direction is mounted on the screen support base. It is designed to be fixed on 52. These screen support 52, X-axis direction,
The Y-axis position setting devices 60 and 61, the moving devices 62 and 63, the screen fixing device 64, and the like constitute the screen positioning support device 20.

A pair of guide rails 70 are fixed to the lower side of the screen support base 52 at right angles to the substrate carrying direction, and guide rails 78 are also provided on the pair of protrusions 58, respectively. The guide rail 78 is the guide rail 70.
The slide 80 of the printing device 22 is slidably fitted to these guide rails 78 in a pair of guide blocks 82. The slide 80 has a U-shape as shown in FIG. 3, and a guide block 82 is fixed to the lower surfaces of a pair of U-shaped legs 84 and fitted to the guide rail 78. A nut 88 is provided at a connecting portion 86 that connects the pair of leg portions 84 of the slide 80, and the nut 88 is screwed into a ball screw 90 supported by the screen support base 52.
Is rotated by a squeegee moving servo motor 92 (see FIG. 23), so that the slide 80 is moved in the horizontal plane in the printing direction perpendicular to the substrate transport direction. A squeegee is mounted on the slide 80 as will be described later, and the nut 88, the ball screw 90 and the squeegee moving servo motor 92 are mounted on the slide 80.
4.

A supporting member 100 is erected on each of the pair of leg portions 84 of the slide 80, as shown in FIGS. 2 and 4. To the upper ends of these support members 100, both ends of a support plate 102 arranged in the horizontal direction and in the screen width direction perpendicular to the printing direction are fixed. An air cylinder 104 for raising and lowering the print head is fixed downward at the center of the support plate 102 in the longitudinal direction.
The piston rod 106 of the print head elevating air cylinder 104 penetrates the support plate 102, and as shown in FIG. 5, the piston rod 110 of the contact load adjusting air cylinder 108.
Is linked to Air cylinder for contact load adjustment 108
Is for adjusting a contact load of a squeegee, which will be described later, on the screen 18, and the air cylinder 1 for raising and lowering the print head.
It is raised and lowered by 04.

As shown in FIG. 5, the piston rod 110
The piston 112 fixed to is fitted in a cylinder housing 114 in an airtight and slidable manner. An air chamber 116 is formed on the upper side of the piston 112 and an atmospheric pressure chamber 118 is formed on the lower side.
Are formed. The air chamber 116 includes the electromagnetic directional control valve 1
By switching between 20 and the electromagnetic proportional pressure reducing valve 122, the air source 124 is selectively communicated with the atmosphere, and the cylinder housing 114 is moved up and down.

The electromagnetic directional switching valve 120 is provided between the air chamber 116 and the air source 124, and the electromagnetic proportional pressure reducing valve 122 is provided between the electromagnetic directional switching valve 120 and the air source 124. The switching of the electromagnetic directional control valve 120 is performed by the control device 13
Controlled by 0, the air chamber 116 is switched between a state of communicating with the air source 124 and a state of communicating with the electromagnetic proportional pressure reducing valve 122. The electromagnetic direction switching valve 120 is installed in the air chamber 11.
In a state where 6 is communicated with the air source 124, the cylinder housing 114 is positioned at the rising end position where the bottom wall 132 contacts the piston rod 110.

As shown in FIGS. 4 and 6, a mounting plate 136 is fixed to the lower surface of the cylinder housing 114 of the contact load adjusting air cylinder 108 in parallel with the width direction of the screen. A rotating plate 138 is attached to the mounting plate 136 so as to be rotatable about an axis parallel to the printing direction. The rotating plate 138 is long in the width direction of the screen as shown in FIG. 4, and as shown in FIG. These connecting plates 142 are sandwiched between the supporting plates 14
The support shaft 144 is rotatably fitted to the 0 and the connection block 142, and the rotating plate 138 is attached to the mounting plate 136 so as to be rotatable about an axis parallel to the printing direction.

A print head 150 is attached to the lower side of the rotating plate 138 via two load sensors 148. The load sensor 148 and the print head 150 can be rotated together with the rotating plate 138 about an axis parallel to the printing direction, and can be moved up and down by the print head elevating air cylinder 104 and the contact load adjusting air cylinder 108. This elevation is guided by a pair of guide rods 152 fixed to the mounting plate 136 and penetrating the support plate 102. Further, a rod 154 is attached to the attachment plate 136 so as to be able to move up and down and protrudes above the support plate 102. The plate 136 is fixed at a predetermined height or allowed to move up and down.

The two load sensors 148 are, as shown in FIG. 6, a rotary plate 138 and a mounting member 4 for the print head 150.
It is provided side by side in the printing direction at a central position in the screen width direction with respect to 08. Four strain gauges (not shown) are attached to the body of the load sensor 148 to form a bridge circuit. The strain of the strain gauge is converted into an electric signal by the bridge circuit, and a control device is also passed through a signal processing circuit. Is supplied to 130. The load sensor 148 is attached in such a manner that there is a slight gap between one end of the main body, which is separated in the longitudinal direction of the main body, and the mounting member 408, and between the other end and the rotating plate 138. When a vertical load is applied, strain occurs in the strain gauge. The controller 130 is configured to calculate the load applied to the main body of the load sensor 148 as a negative value based on the strain generated in the strain gauge.

As shown in FIG. 7, the mounting member 408 is mounted on the lower surfaces of the two load sensors 148. A plate-shaped supporting member 412 is fixed to the lower surface of the mounting portion 410 extending downward of the mounting member 408 in parallel with the screen width direction, and side plates 414 are provided on both end surfaces in the longitudinal direction of the supporting member 412. Are fixed (only one side plate 414 is shown in FIG. 7).

The printing material container 400 is detachably attached to the attachment portion 410 between the pair of side plates 414. The container body 402 includes a second plate member 404,
The first plate-shaped member 418 and the closing plates 420 (see FIG. 8) fixed to both end surfaces in the longitudinal direction of the first plate-shaped member 418 are provided, and these first and second plate-shaped members 418,
The printing material chamber 406 is constituted by the blocking plate 404 and the closing plate 420. The tip of the closing plate 420 extends from the first plate-shaped member 418 toward the second plate-shaped member 404, and contacts the surface of the second plate-shaped member 404 on the first plate-shaped member 418 side at the tip end surface. By making contact with each other, the opening in the longitudinal direction of the printing material chamber 406 is closed and both plate-shaped members 404, 41 are provided.
8 intervals are defined.

Notches are formed in the first and second plate members 418 and 404, respectively, and a rubber squeegee 162 is fixed thereto. These squeegees 162 each have a plate shape, and the squeegee holding member 166 is fixed to the first and second plate-shaped members 418 and 404 by screws 170, so that the squeegees are fixed to the first and second plate-shaped members 418 and 404. Has been done. The lower edges of the pair of squeegees 162 form a printing agent ejection port 180 communicating with the printing agent chamber 406.

The first plate member 418 and the second plate member 404.
Is a pair of engagement devices 430 (only one of which is shown in FIGS. 4 and 8) provided at a distance in the direction perpendicular to the screen printing direction when the printing material container 400 is removed from the mounting portion 410. ) Is kept in an integrally engaged state. The engagement device 430 has a shaft 432 rotatably fitted to the first plate member 418 as shown in FIG. 7. From the first plate member 418 of the shaft 432 to the second plate member 4
A bush 437 is fitted to the projecting end projecting to the side opposite to 04 so as to be relatively movable in the axial direction, and a plate-like engagement is made to the projecting end of the shaft 432 from the bush 437. One longitudinal end of the member 434 is fixed at a right angle to the axis of the shaft 432. As shown in FIG. 7, on the surface of the other end portion of the engaging member 434 on the side of the first plate member 418, an engaging surface 435 having the highest central portion in the width direction and a lower cylindrical portion on the edge side is formed. Has been formed.

Further, the protruding end of the shaft 432 protruding from the first plate member 418 toward the second plate member 404 is
A coil spring 436 which is a spring as an urging means is fitted and a lever 438 is fixed. A portion of the second plate-shaped member 404 corresponding to a portion of the first plate-shaped member 418 on which the shaft 432 is provided is notched, and the shaft 4
32 is projected without interfering with the second plate member 404, and a fitting portion 440 having an oval cross section is formed at the projecting end portion of the shaft 432 as shown in FIG. A female screw hole (not shown) is formed at the tip of 440.

The lever 438 has a T-shape as shown in FIG. 4, and is fitted into the fitting portion 440 in a relatively non-rotatable manner in an elongated hole 442 formed at one end of a T-shaped horizontal bar (arm portion). After being assembled, the bolt 444 is screwed into the female screw hole formed in the fitting portion 440, and is fixed to the shaft 432. The coil spring 436 is the lever 438.
And the first plate-shaped member 418 in a compressed state, the engaging member 434 is pressed against the mounting portion 410 via the shaft 432 while the first plate-shaped member 418 is pressed against the mounting portion 410.

An engaging member 448 is fixed to the other end of the T-shaped horizontal bar. The main body of the engaging member 448 is a male screw member having a hole with a bottom in the center, and is screwed into a female screw hole formed at the other end of the T-shaped horizontal bar and is fixed by a lock nut. The axial position is adjustable. The bottomed hole of the male screw member is opened at the end face on the side facing the first plate-shaped member 418, and a part of the ball is exposed to the outside at the open end and the ball is prevented from coming off the male screw member. The compression coil spring in the male screw member biases the male screw member in the protruding direction. The engaging member 434 is moved from the shaft 432 to the engaging member 448.
It is extended to the side opposite to the side.

Therefore, the lever 438 can be rotated around the axis of the shaft 432 by operating the operating portion 450 composed of the vertical bar portion of the letter T. In FIG. When it is rotated to the position shown by, the engaging tool 448 engages with the engaging recess 452 (see FIG. 7) of the second plate member 404 in the ball, and the first plate member 418.
And the second plate-shaped member 404 are integrally coupled, the engaging member 434 is disengaged from the back surface of the mounting portion 410 of the mounting member 408 to allow the first plate-shaped member 418 to be detached from the mounting portion 410. It becomes a state. The shaft 432 has a bush 437.
By this, the engagement member 434 is prevented from moving in a direction approaching the first plate member 418, and the ball of the engagement tool 448 is kept in the state of engaging with the engagement recess 452. The members 418 and 404 are sandwiched by the engagement tool 448, the engagement member 434, and the bush 437 and are kept in a state of being integrally coupled.

On the other hand, when the lever 438 is rotated to the position shown by the solid line in FIG. 4, the engagement tool 448 is disengaged from the engagement recess 452 and the first plate member 418 and the second plate member 4 are removed.
04 is released from the integral connection with the engaging member 43.
4 engages with the attachment portion 410, and the first plate member 418 is attached to the attachment member 408. At this time, the engaging member 434
Is guided by the engagement surface 435 having a partially cylindrical shape and engages the mounting portion 410 against the biasing force of the coil spring 436, and the first plate member 418 is pressed against the mounting portion 410 by the biasing force of the coil spring 436. And is stably attached to the attachment member 408.

As shown in FIG. 9, a pair of positioning pins 454 (only one of which is shown in the drawing) is provided on the mounting portion 410 so as to be spaced apart in the width direction of the screen. When the printing agent container 400 is mounted on the mounting member 408, the pair of positioning holes 456 formed in the first plate-shaped member 418 is fitted into the positioning pin 454. The positioning pin 454 has a length that penetrates the first plate-shaped member 418 and projects toward the printing agent chamber 406 side, and a conical positioning recess 458 is formed on the projecting end surface.
Further, a positioning member 460 is provided on the second plate member 404 so as to project therefrom. The positioning member 460 is screwed into the female screw hole of the second plate member 404 and fixed by a lock nut, and the printing agent chamber 4 of the second plate member 404 is fixed.
A conical positioning protrusion 462 is provided on the tip end portion protruding from the side surface forming 06.

When the first plate-shaped member 418 is fitted into the positioning pin 454 in the positioning hole 456, the surface of the second plate-shaped member 404 forming the printing agent chamber 406 abuts on the tip end surface of the positioning pin 454. , The distance between the first plate-shaped member 418 and the second plate-shaped member 404, the printing agent extrusion device 470.
The thickness is specified to be slightly larger than the thickness of the extruded plate 230 of FIG. In addition, the positioning convex portion 462 has the positioning concave portion 458.
Then, the position of the second plate member 404 in the direction parallel to the plate surface of the first plate member 418 is determined.

The printing material container 400 includes the first plate member 41.
8 and the second plate-shaped member 404 between the printing agent extruding device 470.
The extrusion plate 230 is attached to and removed from the attachment member 408. The printing agent extrusion device 470 is shown in FIG.
And, as shown in FIG. 7, it has an air cylinder 222 for extrusion. The air cylinder 222 for extrusion is provided with the mounting member 40.
8 is attached downward to a supporting member 224 fixed to the rear surface of the mounting portion 410 of the No. 8 attaching unit 410, and a holding member 228 fixed to the protruding end of the piston rod 226 is used to push the pushing plate 23.
0 is held.

The holding member 228 has a U-shape as shown in FIG. 8, and the pair of U-shaped arms has a front side (the second plate member 404) of the mounting member 408 as shown in FIG. Side) and is engaged with the push-out plate 230. The extrusion plate 230 is the printing agent chamber 4
And a rubber such as a soft synthetic resin that has a dimension that allows it to slidably fit into 06 and that prevents cream-like solder from entering the gap between the wall surface of the printing agent chamber 406 and the extrusion plate 230 at the lower end thereof. A sealing member made of elastic material is attached.

The extruding plate 230 has such a length that the lower end thereof fits into the printing agent chamber 406 even when it is moved up and down by the extruding air cylinder 222, even at the rising end position. Therefore, when the printing agent container 400 is attached to the attachment member 408 as described above, the extrusion plate 230 is fitted into the printing agent chamber 406, and the extrusion plate 230 is fitted to the holding member 228 at the rising end position. At the same time, the printing agent container 400 is attached to the attachment member 408.

The pushing air cylinder 222 is a double-acting type air cylinder, and as shown in FIG.
To the atmosphere, open to the atmosphere, and the air source 1
The pressure in the air chamber is maintained without being communicated with either 24 or the atmosphere. The pressure of the air supplied to the air chamber on the upper side that pushes out the extrusion plate 230 is detected by the extrusion pressure sensor 473,
The controller 1 based on the detection result of the extrusion pressure sensor 473.
By controlling the switching of the electromagnetic directional control valve 472, the air pressure in the air chamber on the extrusion side is controlled to a height at which the plate 230 pushes out the creamy solder in the printing agent chamber 406 with a preset extrusion pressure. It

The rising end position of the pushing plate 230 is shown in FIG.
As shown in FIG. 5, a rising end position including a dog 476 mounted upward on the upper surface of the holding member 228 and a rising end position sensor 478 mounted on the support member 224 mounting the pushing air cylinder 222 to detect the dog 476. It is detected by the detection device 474. Also, the extrusion plate 2
The lower end position of 30 is the lower end position sensor 4 attached to the dog 482 mounted downward on the lower surface of the holding member 228 and the support member 412 supporting the side plate 414.
It is detected by the descending end position detecting device 480 including 84 and. The lower end position of the push-out plate 230 is located at a relatively small fixed distance (eg, 7.5) from the printing agent discharge port 180.
mm) It is set in the retracted position.

The second plate member 404 is rotated by the rotating device 490. In this embodiment, the print head 1
Reference numeral 50 includes a printing agent container 400, a printing agent pushing device 470, and a rotating device 490. Rotating device 4
The 90 has a rotating air cylinder 492 as shown in FIG. The rotating air cylinder 492 is attached downward to a supporting member 494 attached to the pushing air cylinder 222 of the printing agent pushing device 470. An engaging member 498 is fixed to the tip of the piston rod 496 in parallel with the width direction of the screen.
At both ends separated in the longitudinal direction of the
0 is formed.

Each of these fitting grooves 500 has a roller 50 rotatably attached to one end of a lever 502.
4 are fitted. As shown in FIG. 6, each of the pair of levers 502 is rotatably attached to the side plate 414 at a central portion in the longitudinal direction by a shaft 506, and one end of the lever 502 cannot be relatively moved by an L-shaped connecting plate 508. As shown in FIG. 8, the roller 504 is rotatably attached to the bracket 510 fixed to the connecting plate 508 and fitted into the fitting groove 500.

At the other end of the lever 502, the first link 5
One end of 14 is rotatably connected by a shaft 516, and the other end of the first link 514 is rotatably connected by a shaft 518 to a rotating plate 520. Rotating plate 52
0 is arranged outside the side plate 414, leaving a very small gap between the side plate 414 and the side plate 414.

A second link 522 having a dogleg shape is connected to a center portion of the first link 514 in the longitudinal direction by a shaft 524 so as to be relatively rotatable. One end of the second link 522 is rotatably attached to the side plate 414 by a shaft 526, and one end of the third link 528 is attached to the shaft 5 at the other end.
It is connected by 30 so that relative rotation is possible. The other end of the third link 528 is connected to the rotating plate 520 by a shaft 532 so as to be relatively rotatable. Therefore, when the piston rod 496 of the rotating air cylinder 492 is expanded and contracted, the vertical movement of the engagement member 498 is converted into the rotational movement by the lever 502, the first, second, and third links 514, 522, 528. Is transmitted to the rotating plate 520.

The upper surface of the rotating plate 520 is positioned in the same plane as the upper surface of the second plate member 404 as shown in FIG. As shown in FIG. 4 and FIG. 6, a prismatic engagement block 534 is fixed. The engagement block 534 is provided on the side plate 414.
Over and above and above the upper surface of the rotating plate 520. In the middle part of the front surface of the engagement block 534,
As shown in FIGS. 4 and 10, the V groove 5 as an engaging groove
36 is formed, and a chamfer 5 is formed on the upper edge of the front surface.
37 is applied.

On the other hand, a support block 538 is integrally provided on the upper surface of the rotating plate 520 as shown in FIG. As shown in FIGS. 4 and 6, the support block 538 is an L-shaped member having a width that extends above the side plate 414 and above the end portion of the second plate member 404, and one arm portion 540. In the above, the upper surface of the rotating plate 520 is connected to the rear portion of the engagement block 534, and the other arm portion 542 extends above the engagement block 534. The engagement block 534 is just fittable within the rectangular recess formed by the upper surface of the rotating plate 520 and the arm portions 540 and 542 of the support block 538. The support block 538 is formed with a bottomed fitting hole 544 that opens to the end surface of the arm portion 542, and the engaging lever 5
A spring receiver 548 provided at 46 is fitted.

The engaging lever 546, as shown in FIG.
It is provided with a rod-shaped operation portion 550 and a rod-shaped engagement portion 552 which respectively protrude outward in the radial direction from two locations of the bottomed cylindrical spring receiver 548 which are separated in the diameter direction. Mating hole 5
A coil spring 556, which is a spring as an urging means, is arranged in a spring receiver 548 fitted in 44, and a screw member 558 is made to penetrate the spring receiver 548 and the bottom wall of the fitting hole 544, and a nut 560. The engaging lever 546 is biased by the coil spring 556 by being fixed to the bottom wall of the engaging portion 552, and the engaging portion 552 is elastically engaged with the V groove 536 of the engaging block 534. Therefore, the engaging portion 552 is formed with a protrusion having a V-shaped cross section that can be engaged with the V groove 536. Due to the formation of this projection and the formation of the chamfer 537, the engagement portion 552 is favorably engaged with the engagement block 534 when the engagement lever 546 is rotated. This is because when the engagement lever 546 is rotated, engagement and disengagement of the engagement portion 552 with the engagement block 534 is guided by the protrusion of the V-shaped cross section and the slope of the chamfer 537.

As shown in FIG. 4, the engaging portion 552 has the engaging groove 5 of the engaging block 534 fixed to the second plate member 404.
36, the engagement state is stably maintained, and the engagement block 534 is fitted in the rectangular recess formed by the rotating plate 520 and the support block 538 as described above. It is sandwiched by the engaging portion 552 of the engaging lever 546 and the arm portion 540 of the support block 538 from the front and back to be integrally engaged with the rotating plate 520, and the engaging block 534, and by extension, the second plate member 404. It is rotated integrally with the rotating plate 520. This engagement is performed by the engagement lever 54
6 can be released by rotating against the biasing force of the coil spring 556 to a non-engagement position 90 degrees away from the engagement position shown in FIG. In addition, the side plate 4
Reference numeral 14 denotes a closing portion 562 (see FIG. 6) that closes an opening formed between the closing plate 420 and the second plate member 404 when the second plate member 404 is rotated together with the rotating plate 520.
Having.

As described above, when the printing agent container 400 in which the first plate member 418 and the second plate member 404 are integrally engaged by the engaging device 430 is attached to the attachment member 408, The coupling lever 546 is rotated to the non-engaging position, and the first plate member 418 is moved to the positioning pin 454.
First, the engaging lever 546 is rotated to the engaging position to engage the engaging portion 552 with the engaging block 534 of the second plate member 404. Next, the lever 438 of the engagement device 430 is operated to move the first plate member 418 to the mounting member 408.
And the second plate member 404 is disengaged from the first plate member 418. As a result, the second plate-shaped member 404 moves with respect to the first plate-shaped member 418 to the rotating plate 5
It becomes rotatable with 20.

As shown in FIG. 11, a printing agent supplying device 570 is provided at the printing agent supplying position which is one end in the moving direction of the printing apparatus 20. Printing agent supply device 57
0 is a printing agent supply device 572 containing cream solder
Having. The printing agent supplier 572 is provided with a pair of air cylinders 574 for lowering the piston, and an extruding / stirring motor 57.
The cream-like solder is extruded by the forward rotation of the screw by 6, and when not supplied, the cream-like solder is not extruded by the reverse rotation of the extrusion / agitation motor 576 and is agitated to maintain the viscosity suitable for printing. It is a thing. The printing agent supply unit 572 is located at a rising end position where the supply port is separated from the printing agent chamber 406 by a printing agent feeder lifting device (not shown), and as shown in FIG.
It is moved to a descending end position located inside, and is moved in parallel to the printing agent chamber 406 by a printing agent feeder moving device (not shown) at the descending end position to supply the cream solder to the printing agent chamber 406. .

The screen cleaning device 24 will be described. As shown in FIGS. 1 and 12, the screen cleaning device 24 includes a lower surface of the screen 18, that is, the printed circuit board 12.
A cleaning device 592 having a cleaning head 620 disposed on the substrate contact surface 590 side with which the screen is contacted, and the screen 1
8, the wiping head 89 provided on the printing agent pressing surface 594 side where the creamy solder is pressed into the through hole.
And a wiping device 596 having zero.

The cleaning device 592, as shown in FIG.
A pallet with a shallow container shape that is long in the width direction of the screen.
Has 98. In FIG. 13, the pallet 598 is shown with the side plate removed. The pallet 598 is arranged with the opening facing upward, and the plate-shaped base 600 is fixed to the upper surface. The base 600 is long in the longitudinal direction of the pallet 598, and both ends in the longitudinal direction are provided with supporting portions 602 and 604, which are long in the printing direction, as shown in FIG. As shown in FIGS.
06 is erected. A guide block 608 is fixed on each pedestal 606, and a fixed guide rail 70 is slidably fitted to the lower surface of the screen support base 52 and engaged in a vertically unmovable manner. ing.

Further, on the other supporting portion 604, FIG.
A support member 610 is provided upright as shown in FIG. A bracket 612 is fixed on the support member 610, and a guide block 614 is fixed to each of two positions of the bracket 612 which are separated from each other in the printing direction. The guide block 614 is slidably fitted to the guide rail 70. , Are engaged so as not to be pulled out in the vertical direction. The pallet 598 is composed of a total of four guide blocks 608, 614 and a pair of guide rails 70, so that the screen support base 5
It is supported on the lower side of 2 so as to be movable in the printing direction.

A cleaning head 620 is attached to the base 600 so as to be able to move up and down by an elevating device 622.
The head body 624 of the cleaning head 620 is similar to that shown in FIGS.
As shown in FIG. 3 and FIG. 18, a pair of side plates 626 (see FIG. 18) arranged in a posture parallel to the printing direction at a position separated from each other in the width direction of the screen forms an elongated shape, and Support member 62 fixed between the side plates 626
8, 630 (see FIGS. 12 and 18).

Between these supporting members 628 and 630,
As shown in FIG. 12, an ultrasonic vibrator 632 is fitted and fixed. The ultrasonic vibrator 632 has a casing 63.
In the mounting portion 636 having the six ultrasonic vibrating heads housed in the four and protrudingly provided on the outer surface of the casing 634, the positioning pins 638 provided in the supporting members 628 and 630 in the vertical direction cause the vertical direction. The position of is fixed. As shown in FIG. 13, the upper surface of the casing 634 is set to a position slightly above the side plate 626, and in this state, the mounting portion 636 has the bolt 640.
It is fixed to the supporting members 628 and 630 by (see FIG. 12).

The ultrasonic vibrating head is provided with a magnetostrictive oscillator, a cone and a horn, and the horn is a wedge-shaped horn having a rectangular cross section and a thickness that smoothly decreases toward the tip. The upper end surface of each horn of the six ultrasonic vibrating heads is fixed to the upper wall of the casing 634,
The upper end surface of the horn vibrates ultrasonically, and the casing 634 is vibrated by the ultrasonic vibrating head.

The movable cleaning agent supply member 64 is provided on the upstream side of the ultrasonic vibrator 632 in the cleaning head moving direction (direction indicated by arrow A in FIG. 12) during screen cleaning.
4 are provided. The movable cleaning agent supply member 644 has a cylindrical shape, and communicates with the cleaning agent supply passage 646 and the cleaning agent supply passage 646 that extend in the longitudinal direction inside the movable cleaning agent supply member 644, as shown in FIGS. A plurality of open supply ports 648 are formed at equal intervals in the longitudinal direction. FIG.
As shown in FIG. 4, a rotating arm 650 is supported on each outer surface of the pair of side plates 626 by a supporting shaft 652 so as to be rotatable about an axis parallel to the screen width direction (see FIG. Only rotating arms 650 provided on one side plate 626 are shown), and both ends of the movable cleaning agent supply member 644 are attached to the free ends of these rotating arms 650. The movable cleaning agent supply member 644 is arranged in the screen width direction.

By rotating the rotating arm 650, the movable cleaning agent supply member 644 is positioned below the upper surface of the casing 634 of the ultrasonic vibrator 632 as shown by the solid line in FIG. Is directed downward and is moved to a supply position for supplying the cleaning agent and a retracted position for supplying the cleaning agent, which is located above the upper surface of the casing 634 and does not supply the cleaning agent. The rotating arm 650
A ball plunger 654 is provided at the end opposite to the side where the movable cleaning agent supply member 644 is attached, as shown in FIG. The ball plunger 654 is
The ball 656 is housed in a bottomed cylindrical casing having an external thread formed on its outer peripheral surface so that it cannot be pulled out, and is biased in a direction projecting from the casing by a spring. The ball 6 into the notch 658 formed in the side plate 626.
The movable cleaning agent supply member 644 is inserted by inserting 56.
Are held in the supply position.

As shown in FIG. 17, a liquid passage 660 communicating with the cleaning agent supply passage 646 is formed in the rotating arm 650, and the liquid passage 660 communicates with a liquid passage 662 formed in the support shaft 652. Has been made. The liquid passage 662 is
Cleaning is performed by opening and closing an electromagnetic opening / closing valve 664 (see FIG. 23) which is connected to a cleaning agent supply source (not shown) for the movable cleaning agent supply member 644 and is provided between the liquid passage 662 and the cleaning agent supply source. The cleaning agent is supplied to the agent supply passage 646, and the supply is shut off. A pallet 666 is provided below the movable cleaning agent supply member 644 as shown in FIG. The pallet 666 is provided in parallel with the movable cleaning agent supply member 644 and receives the dripping cleaning agent.

As shown in FIG. 12, a fixed cleaning agent supply member 670 is provided on the downstream side in the moving direction of the ultrasonic vibrator 632 during screen cleaning. The fixed cleaning agent supply member 670 has a longitudinal shape as shown in FIG. 17, and as shown in FIG. 12, the ultrasonic cleaner 63 has an upper surface parallel to the screen width direction on the support member 630.
The two casings 634 are positioned at the same height as the upper surface of the casing 634, and both ends thereof are fixed to the side plates 626. A cleaning agent supply passage 672 extending in the longitudinal direction is formed in the fixed cleaning agent supply member 670, and a plurality of supply ports 674 opening to the cleaning agent supply passage 672 and the upper surface of the fixed cleaning agent supply member 670 (see FIG. 16) are formed at equal intervals.

The cleaning agent supply passage 672 is, as shown in FIG. 17, a liquid passage 676, 6 formed in the side plate 626.
78, a joint member 680 fixed to the outer surface of the side plate 626 (see FIG.
4, FIG. 16), and a cleaning agent supply source for a fixed cleaning agent supply member (not shown) via a hose (not shown). Then, by opening / closing the electromagnetic opening / closing valve 684 (see FIG. 23), the cleaning agent is supplied to the cleaning agent supply passage 672, and the supply is shut off.

Further, a space between the pair of side plates 626 is shown in FIG.
As shown in FIG.
The air injection member 692 of the cleaning sheet side drying device 690 is provided on the downstream side of the contact portion between the cleaning sheet and the screen 18 in the moving direction of the ultrasonic vibrator 632 when the cleaning sheet is brought into contact with the cleaning sheet. The air injection member 692 has a cylindrical shape, is fixed to the pair of side plates 626 at both ends, and as shown in FIG. 17, an air passage 694 formed in the side plate 626 and a joint attached to the inner surface of the side plate 626. It is connected to an air supply source (not shown) via a member 696 (see FIG. 15) and the like. Air is supplied to the air injection member 692 by opening and closing an electromagnetic on-off valve 698 (see FIG. 23) provided between the air injection member 69 and the air supply source.
It is jetted from a slit formed in a straight line on the peripheral wall of No. 2 or the supply is cut off.

A cleaning sheet 710 is provided on the ultrasonic vibrator 632 and the fixed cleaning agent supply member 670 as shown in FIG. The cleaning sheet 710 is in the form of a strip having a width substantially equal to the width of the screen 18, is made of paper having porosity and hygroscopicity, and is wound around the supply shaft 712. A supply shaft support member 714 is fixed to each of the pair of side plates 626 as shown in FIG. Each of these supply shaft support members 714 is formed with a U-shaped notch 716, and
Both ends of 2 are rotatably fitted in the notches 716, and the supply shaft 712 is parallel to the screen width direction by the supply shaft support member 714 and is perpendicular to the relative movement direction of the cleaning sheet 710 and the screen 18. It is rotatably supported about an axis parallel to the plane of the screen 18. The supply shaft 712 can be easily attached to and removed from the supply shaft support member 714 by fitting or removing both ends into the notches 716.

The cleaning sheet 710 is pulled out from the supply shaft 712 and, as shown in FIG. 14, the supply shaft support member 714.
After being hung from above by a guide roller 718 rotatably attached to the ultrasonic cleaner 632 and the fixed cleaning agent supply member 67, the movable cleaning agent supply member 644 is passed underneath.
0, is passed between the fixed cleaning agent supply member 670 and the air injection member 692, is guided by the guide roller 720, and is wound by the winding shaft 722. Cleaning sheet 7
10 ultrasonic vibrators 632, fixed cleaning agent supply member 670
The portion located at the upper cleaning position is the cleaning surface for cleaning the substrate contact surface 590. As shown in FIG. 15, one end of the winding shaft 722 is supported by the support plates 723 and 726 fixed to one side plate 626, and the other end thereof is the other side plate 626.
By the winding shaft support member 724 fixed to (see FIG. 14),
It is rotatably supported about an axis parallel to the rotation axis of the supply shaft 712.

The U-shaped notch 7 is formed in the winding shaft support member 724.
26 is formed, and the other end of the winding shaft 722 has a cutout 7
26 is rotatably fitted to the pressing plate 728 and
This prevents it from being pulled out from the notch 726. The support of one end of the winding shaft 722 by the support plates 723 and 726 will be described later. The guide roller 720 is rotatably supported by the winding shaft support member 724 and the support plate 726. In FIG. 14, the ends of the supply shaft 712 and the take-up shaft 722 opposite to the side where the cleaning sheet feeding device described later is provided are supported by the supply shaft support member 714 and the take-up shaft support member 724. The side plate 626 on the side where the cleaning sheet feeding device is provided is shown in the opened state and the pair of side plates 626.

When setting the cleaning sheet 710, the movable cleaning agent supply member 644 is retracted to the retracted position, and after setting, moved to the supply position. As a result, the cleaning sheet 710 is pressed against the upper surfaces of the ultrasonic vibrator 632 and the fixed cleaning agent supply member 670 by the movable cleaning agent supply member 644. The retracted position of the movable cleaning agent supply member 644 is a release position for releasing the cleaning sheet 710, and the supply position is a pressing position for pressing the cleaning sheet 710 against the ultrasonic vibrator 632.

As shown in FIG. 13, a cleaning sheet feeding device 730 for feeding the cleaning sheet 710 is attached to the outer surface of the support plate 723. In the head body 624,
Supply shaft 712, winding shaft 722, ultrasonic vibrator 632, movable cleaning agent supply member 644, fixed cleaning agent supply member 670,
The air ejecting member 692, the cleaning sheet feeding device 730, and the like are provided, and these are the cleaning head 620.
Is composed.

In the cleaning sheet feeding device 730, the ratchet wheel 732 is attached to the cleaning sheet feeding air cylinder 734.
By rotating the cleaning sheet 710, the cleaning sheet 710 is fed by a constant pitch. Support plate 72
3,726 has a stepped shape as shown in FIG.
A rotating body 738 having a circular cross section is fitted rotatably around an axis parallel to the screen width direction. Rotating body 7
A bottomed hole 736 that opens to the end surface of the large-diameter portion is formed in 38, and a shallow and wide fitting that penetrates in the diametrical direction is formed at the opening-side end of the bottomed hole 736 of the large-diameter portion. A groove 739 is formed. A fitting protrusion 741 having an oval shape and having a longitudinal dimension equal to the outer diameter of the large diameter portion of the rotating body 738 is formed at one end of the winding shaft 722, and the fitting protrusion 741 is formed. A fitting projection 743 having a small diameter is provided on the end surface of the. The take-up shaft 722 is fitted into the bottomed hole 736 of the rotating body 738 at the fitting protrusion 743, and fitted into the fitting groove 739 at the fitting protrusion 741.
The relative rotation between the take-up shaft 722 and the take-up shaft 722 is blocked, and the rotating body 738
Is transmitted to the winding shaft 722.

A support shaft 740 is fixed to the bottom wall of the rotating body 738 so as to be concentric and non-rotatable. Support shaft 74
The ratchet wheel 732 is fitted to the protruding end portion of the rotating body 738 of 0, and relative rotation is prevented. A rotating plate 742 is relatively rotatably fitted between a portion of the support shaft 740 where the ratchet wheel 732 is fitted and a head of the support shaft 740. Rotating plate 7
A ratchet pawl 744 is rotatably attached to 42, and is biased by a spring (not shown) in a direction in which it meshes with teeth 746 of the ratchet wheel 732.

The cleaning sheet feeding air cylinder 734.
As shown in FIGS. 13 and 16, one end of a link 750 is rotatably connected to a piston rod 748 of the link 750 by a joint member 749, and the other end of the link 750 is connected to a rotating plate 74.
2 is rotatably connected to the piston rod 748.
The rotating plate 742 is rotated by the expansion and contraction of. 752
Is a stopper lever that prevents the ratchet wheel 732 from rotating in the direction opposite to the cleaning sheet feeding direction, and is biased by a spring 754 to prevent the ratchet wheel 73 from rotating.
It is meshed with the second tooth 746.

When the piston rod 748 of the cleaning sheet feeding air cylinder 734 is extended and the rotating plate 742 is rotated in the positive direction, the ratchet pawl 744 moves while meshing with the teeth 746 of the ratchet wheel 732. , Rotate ratchet wheel 732. Thereby, the rotating body 738 is rotated and the winding shaft 72 is rotated.
2 is rotated and the cleaning sheet 710 is sent.

At the extended end of the piston rod 748, the stopper surface 755 provided on the joint member 749 is provided with a support plate 726.
Is defined by abutting a stopper member 756 provided on the outer surface of the piston rod 748.
It depends on the extension end position of 48. Stopper member 756
Is screwed to a bracket 758 fixed to the outer surface of the support plate 726. By adjusting the screwing position,
Cleaning sheet 71 by expanding and contracting the piston rod 748
The feed length of 0 can be adjusted.

When the piston rod 748 is contracted and the rotating plate 740 is rotated in the opposite direction, the ratchet pawl 744 moves over the teeth 746 of the ratchet wheel 732. At this time, the rotation of the ratchet wheel 732 is blocked by the stopper lever 752, only the ratchet pawl 744 moves, the winding shaft 722 is not rotated in the opposite direction, and the cleaning sheet 710 is not rewound.

The lifting device 622 is provided with four pairs of links (only two pairs are shown in the drawing) as shown in FIG. A support member 770 is fixed to each of two positions of the base 600, which are separated from each other in the screen width direction, and a rod 772 is provided at both ends of the support member 770 in a direction parallel to the printing direction as shown in FIG. Are fitted so as to be movable in the axial direction. The rod 772 is arranged parallel to the screen width direction. FIG.
As shown in FIG. 8, one end portion of the first link 774 is rotatably connected to each of the pair of rods 772 at two positions separated in the longitudinal direction. As shown in FIG. 12, the other ends of the two first links 774 connected to one rod 772 are rotatably connected to the support member 628, and the other two ends connected to the other rod 772. The other end of the first link 774 is rotatably connected to the support member 630. The above four first links 774
As shown in FIG. 18, one end of each pair of second links 776 is rotatably connected to the intermediate portion in the longitudinal direction of the second link 776, and the other end of the second link 776 is connected to the support member 770.
Are rotatably connected to the

As shown in FIG. 18, an air cylinder 780 for raising and lowering the cleaning head is provided on the supporting member 610 which is erected on the other end of the base 600 in the longitudinal direction, and the piston rod is provided on the piston rod. Two rods 772 are connected by a connecting plate 784. Therefore, when the piston rod is extended, the rod 772 is moved and the four sets of the first and second links 774 and 776 are rotated, the cleaning head 620 is vertically raised, and the cleaning sheet 710 is moved to the screen. The substrate contact surface 590 of 18 is contacted, and the ultrasonic vibrator 632 and the fixed cleaning agent supply member 670 are contacted with the substrate contact surface 590 via the cleaning sheet 710. Further, due to the contraction of the piston rod, the rod 772 is moved in the opposite direction, the four sets of the first and second links 774, 776 are rotated, and the cleaning head 620 is vertically lowered. The elevating device 622 constitutes a cleaning sheet contact / separation device for bringing the cleaning sheet 710 and the like into contact with the substrate contact surface 590 and separating them.

The wiping device 596 will be described. Printer 22
A support plate 800 is vertically fixed to the connecting portion 86 of the slide 80 as shown in FIG. Guide rails 802 are provided at two positions spaced apart from each other in the width direction of the screen of the support plate 800 so as to extend in the vertical direction, and an elevating table 804 is fitted so as to be able to ascend and descend. The lifting platform 804 has a U-shape, and slides on two guide rails 802 in two guide blocks 808 (only one is shown in the figure) fixed to the U-shaped connecting portion 806. It is movably fitted.

On the lift table 804, the air cylinder 8 for lifting the wiping head mounted downward on the support plate 800 is installed.
Twelve piston rods 814 are connected, and the elevating table 804 is guided by the guide rails 802 to move up and down by the expansion and contraction of the piston rods 814. A wiping sheet 820 is mounted on the lift table 804. Wiping sheet 82
0 is a strip having a width almost equal to the width of the screen 18,
The feed shaft 82 is made of paper having a porous hygroscopic property.
The guide rollers 823, 8
It is guided by 25 and is wound by the winding shaft 824.

The supply shaft 822 is perpendicular to the printing direction by a pair of supply shaft support members 826 (only one of which is shown in FIG. 19) fixed to the lifting table 804, and the wiping sheet 820 and the screen. It is rotatably and detachably supported about an axis parallel to the printing surface of the screen 18 at a right angle to the relative movement direction with respect to 18. Further, one end of the take-up shaft 824 is rotatably and detachably supported by a take-up shaft support member (not shown) fixed to the lifting table 804, and the other end is a take-up shaft of the cleaning sheet feeding device 730. Like 722, it is non-rotatably fitted to a rotating body (not shown) rotatably supported by supporting plates 827 and 828 fixed to the lifting table 804, and is fitted around an axis parallel to the axis of rotation of the supply shaft 822. Is rotated.

The wiping sheet 820 is fed by the wiping sheet feeding device 830 having the same structure as the cleaning sheet feeding device 730. By the extension of the piston rod 834 of the wiping sheet feeding air cylinder 832 attached to the support plate 828, the link 836 is moved forward (downward), and the rotation plate 838 rotatably attached to the support shaft 837 is provided. Rotated in the forward direction, ratchet pawl 840
At the same time, the ratchet wheel 842 rotates. Support shaft 8
37 is fixed to a rotating body (not shown) that is rotatably supported by the support plates 827 and 828, and the ratchet wheel 842 is attached to the support shaft 837 so that it cannot rotate relative to each other.
The take-up shaft 824, which is fitted into the rotating body such that it cannot rotate relative to the rotary body, is rotated to feed the wiping sheet 820. The extended end of the piston rod 834 is defined by a stopper member 846 screwed to the bracket 844, and the amount of screwing adjusts the feed amount of the wiping sheet 820 by one expansion / contraction of the piston rod 834.

Further, due to the contraction of the piston rod 834, the link 836 is retracted (raised) and the rotary plate 838 is rotated in the opposite direction. At this time, the rotation of the ratchet wheel 842 is blocked by the stopper lever 852 that is biased by the spring 848 and meshed with the teeth 850 of the ratchet wheel 842, and the take-up shaft 824 is rotated in the opposite direction to wipe the wipe sheet. 82
The 0 is not rewound and the ratchet pawl 840 moves over the tooth 850.

A wiping sheet pressing member 860 is attached to the lifting table 804. Wiping sheet pressing member 8
Reference numeral 60 denotes a cleaning sheet 710 and a screen 1 when the cleaning head 620 and a wiping head, which will be described later, are located at a retracted position separated from the screen 18 and are connected to each other.
8. The wiping sheet 820 is provided so as to face the ultrasonic vibrator 632.

The wiping sheet pressing member 860 is in the form of a plate having a width in the printing direction, is long in the screen width direction, and has both edges parallel to the screen width direction and a curved portion 862 curved upward. Therefore, the feeding of the wiping sheet 820 is not hindered. Wiping sheet pressing member 8
Supporting members 864 are provided upright at a plurality of positions separated in the longitudinal direction of 60. The support member 864 has a support plate 86 whose both ends are fixed to the lower surfaces of the pair of side walls 816 of the lift 804.
6 is movably fitted in the vertical direction, and is urged downward by a compression coil spring 868 as an elastic member that is a kind of urging means, and the wiping sheet pressing member 860 is urged by the urging force. The downward movement limit is
The head 870 of the support member 864 is defined by engaging the support plate 866.

When the wiping head 890 is raised and separated from the screen 18, the head 870 is in contact with the support plate 866, but the wiping head 890 is lowered and the wiping sheet pressing member 860 wipes. Take sheet 8
When the ultrasonic vibrator 632 is contacted via the screen 20, the screen 18 and the cleaning sheet 710, as shown in FIG. The wiping sheet 820 is pressed against the screen 18 by the urging force, and the screen 1 is partially attached to the wiping sheet 820.
A wiping surface parallel to 8 is formed.

The lifting table 804 is also downstream of the contact portion between the wiping sheet 820 and the screen 18 in the moving direction of the wiping sheet 820 when cleaning the screen, and the screen 18 with respect to the wiping sheet 820. A rubber scraping member 874 is attached to the opposite side. The scraping member 874 has a long shape, and is inclined in parallel to the width direction of the screen and toward the upstream side in the moving direction when cleaning the screen as it goes downward.

The lifting table 804 is further provided with a wiping sheet 8 in the moving direction of the wiping sheet 820 when cleaning the screen.
An air ejecting member 882 of the wiping sheet side surface drying device 880 is provided at a position upstream of the contact portion between the screen 20 and the screen 18. The air ejecting member has a cylindrical shape, and has a straight slit that opens downward, and ejects air supplied from an air supply source (not shown) downward. Supply and cutoff of air to the air injection member 882 is controlled by opening and closing an electromagnetic opening / closing valve 884 (see FIG. 23) provided between the air injection member 882 and the air supply source.

As described above, the lifting shaft 804 is provided with the supply shaft 82.
2, a winding shaft 824, a wiping sheet feeding device 830, a wiping sheet pressing member 860, an air ejecting member 882, etc. are provided, and these constitute a wiping head 890. The wiping head 890 is moved up and down by the elevating table 804 to move the screen 1
8 is brought into contact with and separated from the sheet 8, and is moved in the printing direction by the squeegee moving device 94. The cleaning of the screen 18 is performed by moving the wiping sheet 820 in the same direction as the printing direction. The air cylinder 812 for raising and lowering the wiping head constitutes a wiping head raising and lowering device, and the wiping head raising and lowering device brings the wiping sheet 820 into contact with and separates from the printing agent pushing surface 594 of the screen 18 to remove the wiping sheet. A contact / separation device for contacting and separating the pressing member 860 and the scraping member 874 with and from the printing material pressing surface 594 via the wiping sheet 820 is configured. Also,
The squeegee moving device 94 constitutes a wiping head moving device,
The moving wiping unit including the wiping head 890 and the wiping head lifting device constitutes the wiping device 596 together with the squeegee moving device 94.

The cleaning head 620 and the wiping head 89
0 and the like means the connecting device 9 shown in FIG. 18 when cleaning the screen.
00, they are connected via the slide 80 and moved integrally. As shown in FIG. 20, a bracket 612 fixed to a support member 610 that supports a lifting air cylinder 780 that raises and lowers the cleaning head 620 is provided with a mounting portion 906 that extends in the vertical direction and a support block 908 is fixed. ing. Support block 908
A pair of guide rods 910 are fitted so as to be able to move up and down, and the end portions of the guide rods 910 that project upward from the support block 908 and the end portions that project downward are respectively attached to the mounting plate. 912 and 914 are fixed. The mounting plate 912 has two engaging pins 91, which are engaging portions.
6 is fixed upward with a distance in the moving direction of the cleaning head 620 and the wiping head 890 at the time of cleaning the screen, and an engaging air cylinder arranged in the mounting block 908 between the engaging pins 916. A piston rod 920 of 918 (see FIG. 23) is fixed.
Further, an engagement pin 922 is fixed to the mounting plate 914 downward.

As shown in FIG. 20, an L-shaped bracket 930 is fixed to the side surface of the slide 80, and the horizontal arm portion 932 is provided at two positions spaced from each other in the printing direction, as shown in FIGS. As shown in FIG. 22,
An engagement hole 934, which is an engaged portion that penetrates in the up-down direction, is formed. In addition, a bracket 938 is provided on one side in the moving direction of the cleaning head 620 and the wiping head 890 at the time of cleaning the screen of the screen support base 52 and on a side surface of a portion corresponding to the retracted position out of the screen 18.
Is fixed, and an engaging hole 94 that vertically penetrates
0 is formed.

With the slide 80 in the retracted position, the piston rod 920 of the engaging air cylinder 918 is
The mounting plates 912 and 914 are raised by the extension of
If the engagement pin 922 is disengaged from the engagement hole 940 and the engagement pin 916 is fitted into the engagement hole 934, the cleaning head 620 is disengaged from the screen support base 52 and the cleaning head 620 is released. 620 and wiping head 8
90 is integrally connected in the printing direction, that is, the screen cleaning direction. In this state, the wiping head 890 is moved by the squeegee moving device 94, whereby the cleaning head 620 is moved along with the wiping head 890 along the screen 18. Squeegee moving device 9
4 also serves as a cleaning head moving device, and the cleaning head 62
The moving cleaning unit including the 0 and the lifting device 622 constitutes the cleaning device 592 together with the squeegee moving device 94. Further, the contraction of the piston rod 920 causes the mounting plates 912,
914 is lowered and the engagement pin 916 is engaged with the engagement hole 934.
While the engaging pin 922 is disengaged from the engaging hole 94.
When the cleaning head 620 is fitted to 0, the cleaning head 620 is released from the connection with the wiping head 890 and is locked to the screen support base 52. The engaging pin 922 as the engaging portion and the engaging hole 940 as the engaged portion constitute a locking device for releasably locking the cleaning head 620 to the screen support base 52.

This screen printing machine is equipped with the control device 13
Controlled by 0. The control device 130 is mainly composed of a computer, and as shown in FIG. Are connected, and the input device 954 is connected. The control device 130 includes a board conveyor 14, a screen positioning support device 20, a carry-in conveyor 34, a carry-out conveyor 36, a lifting air cylinder 42, and a squeegee moving servo motor 9.
2, print head lifting air cylinder 104, electromagnetic directional control valve 120, electromagnetic proportional pressure reducing valve 122, electromagnetic directional control valve 4
72, a rotation air cylinder 492 of the rotation device 490, a printing agent supply air cylinder 57 of the printing agent supply device 570
4, extrusion / stirring motor 576, electromagnetic on-off valves 664, 68
4,698,884, cleaning sheet feeding air cylinder 7
34, the cleaning head elevating air cylinder 780, the wiping head elevating air cylinder 812, the wiping sheet feeding air cylinder 832, the engagement air cylinder 918, the CCD camera / laser displacement sensor moving device 956, and the like.

The CCD camera / laser displacement sensor moving device 956 includes an X-axis slide, a Y-axis slide provided on the X-axis slide, an X-axis moving device for moving the X-axis slide in the X-axis direction, and an X-axis slide. And a Y-axis moving device for moving the Y-axis slide in the Y-axis direction. The CCD camera 950 and the laser displacement sensor 952 are mounted on the Y-axis slide, and the X-axis slide and the Y-axis slide are provided.
By each movement of the shaft slide, the screen support 52
In the area corresponding to the portion supporting the screen 18 and in the area corresponding to the portion of the carry-out conveyor 36 adjacent to the substrate conveyor 14.

The CCD camera 950 is an image pickup device for picking up a reference mark provided on the screen 18, and may be one that obtains an image on a surface or one that obtains a line-shaped image every time it moves a certain distance. The imaging result is supplied to the control device 130, and each positional error of the screen 18 in the X-axis direction and the Y-axis direction is calculated. Imaging of the reference mark and calculation of the position error are performed, for example, when the screen 18 is replaced, and the position setting devices 60 and 61 in the X-axis direction and the Y-axis direction eliminate the position error based on the calculated position error. The position of the screen 18 is set accordingly, and the screen 18 is moved to the set position by the X-axis and Y-axis moving devices 62 and 63, and then fixed to the screen support base 52 by the screen fixing device 64.

The laser displacement sensor 952 irradiates the cream-like solder printed on the printed board 12 with a laser beam, and the position where the cream-like solder is printed based on the reflected light and the position of each printed cream-like solder. This is a device for detecting the area and height distribution. After the screen printing is completed, if the printed circuit board 12 is transferred onto the carry-out conveyor 36, the laser displacement sensor 952 moves on the printed circuit board 12 in a predetermined movement path by each movement of the X-axis slide and the Y-axis slide. Scan all the way along to detect the position, area and height distribution of all printed creamy solder. The detection result is supplied to the control device 130. In the control device 130, creamy solder is printed at all printing positions, the distribution state of the positions where the creamy solder is printed, the creamy state at each printing position. The distribution of the amount of solder, the amount of creamy solder, and the like can be investigated. The amount of creamy solder is obtained from its area and height distribution.

Based on the results of these examinations, if there is a defect in the printing state, it is determined that the defect has occurred in the RAM of the computer.
It is stored in a storage area provided in. Poor print status means misalignment of printing position, lack of printing amount, normal printing at most printing positions, but not printing at very few printing positions. That is, the cream-like solder is attached to the points. The cause of the poor print state is, for example, the cause of being eliminated by cleaning the screen 18, such as clogging of the through hole and dirt on the printing material contact surface 590. The cause that is solved by agitation, the position of the screen 18
There are various causes such as being corrected by correcting the position of
The occurrence of a defect in the RAM is stored together with the cause of the defect. For example, in the above-mentioned defective printing state, the deviation of the printing position is caused by the deviation of the screen 18, resulting in a shortage of the printing amount, and most of the printing positions are normally printed, but only a part of the printing is performed. The unprinted condition at the position is caused by clogging of the through hole of the screen 18,
Adhesion of creamy solder to places other than the printing place is
The shortage of the printing amount caused by the contamination of the substrate contact surface 590 may also be caused by the improper viscosity of the creamy solder, and the occurrence of defects is stored together with the cause of the defects. The laser displacement sensor 952, CC
The D-camera / laser displacement sensor moving device 956 and the portion that detects the printing position, the printing amount, etc. of the cream solder based on the detection signals of the laser displacement sensor 952 of the computer constitute a printing result detecting device. Further, the ROM of the computer stores various programs required for screen cleaning, screen printing, etc. such as the screen cleaning routine shown in FIG.

Next, the operation will be described. At the time of screen printing, the cleaning head 620 of the screen cleaning device 24 is disconnected from the wiping head 890, and the screen support base 52 is removed.
It is locked to. The cleaning head 620 is in the retracted position. Further, the cleaning head 620 is at the lower end position, the wiping head 890 is at the upper end position, and the cleaning sheet 710 and the wiping sheet 820 are respectively on the screen 18
Away from and does not interfere with printing.

At the time of screen printing, the board conveyor 14
The printed circuit board 12 conveyed by the
Stopped on 0. Next, after the board pressing plate is moved above the printed board 12, the board support base 40 is raised to fix the printed board 12 to the fixed rail 3.
0, if it is lifted from the movable rail 32 and pressed against the substrate pressing plate, a negative pressure is supplied to the substrate supporting base 40 to attract the printed circuit board 12.

After the board support base 40 sucks the printed board 12, the board pressing plate is retracted, and the printed board 1
2 is further raised by the substrate support 40 and brought into contact with the substrate contact surface 590 of the screen 18. Then
The print head 150 is lowered by the print head lifting air cylinder 104, and after moving to the lower end position, the squeegee 16 is further moved by the contact load adjusting air cylinder 108.
2 is lowered and brought into contact with the screen 18.

At the start of printing, the print head 150 operates the squeegee 162 by the contact load adjusting air cylinder 108.
Is stopped 3 mm above the screen 18 and is stopped. In this state, the total weight W of the print head 150 is applied downward to the load sensor 148. At this time, 2
The sum of the output values of the individual load sensors 148 is a negative value −W, and the control device 130 reads the negative value −W and, from the absolute value W thereof, the printing material container 120.
The weight (remaining amount) Ww of the printing agent is calculated by subtracting the weight w of the print head 150 in the empty state and stored.

Then, the contact load adjusting air cylinder 10 is used.
8 air chamber 116 is communicated with the electromagnetic proportional pressure reducing valve 122, and the pressure in the air chamber 116 is gradually reduced. As a result, the cylinder housing 114 descends and the print head 15
Decrease 0. During this descent, the control device 130 causes the output value of the load sensor 148 (the squeegee 162 to move to the screen 18).
Until it comes into contact with, the calculation of adding the absolute value W to -W) is repeated every minute time. This calculation result indicates the contact load F of the squeegee 162 on the screen 18 as a positive value.

When the squeegee 162 is further lowered from the state of contacting the screen 18, the squeegee 162 is elastically deformed and the reaction force F ′ of the contact load F is applied to the main bodies of the two load sensors 148 to distort them. The tensile load applied to the gauge is reduced. At this time, as described above, the control device 130 repeats the calculation of the contact load F from the output value of the load sensor 148 to the screen 18 of the squeegee 162 every minute time, and the contact load F is not shown. In order to display on the
You can know.

When the print head 150 is lowered to bring the squeegee 162 into contact with the screen 18, the controller 130 controls the air chamber 1 of the contact load adjusting air cylinder 108.
The pressure on 16 is controlled based on the contact load F of the squeegee 162 on the screen 18. When the contact load F is lower than the set load, the electromagnetic proportional pressure reducing valve 122 is moved to the air chamber 116.
Is connected to the atmosphere, and when the contact load F is higher than the set load, the air chamber 116 is connected to the air source 124. Printing is done,
As the cream solder in the printing agent container 400 decreases, the total weight of the print head 150 decreases, and in order to obtain a contact load suitable for screen printing, the pressure of the air chamber 116 is reduced as the cream solder decreases. Although it is necessary to lower the pressure, this requirement can be easily satisfied by controlling the pressure of the air chamber 116 based on the contact load F. The pressure control of the air chamber 116 is also performed during screen printing.

The squeegee 162 sets the pressure on the screen 1
8, the extrusion plate 230 is lowered, and the extrusion pressure is applied to the cream solder. However, since the printing agent ejection port 180 of the printing agent container 400 is closed by the screen 18, the cream solder is not ejected and is appropriately pressurized. When the print head 150 is moved along the screen 18 in this state, the cream solder in the printing agent chamber 406 is moved by the squeegee 162 located on the downstream side in the printing direction.
Squeegee 16 located upstream from the outflow
2, the printing material container 400 is scraped from the upper surface of the screen 18 and kept in the printing material chamber 406.
And moves on the screen 18 with. Then, each time the printing agent ejection port 180 faces the through hole of the screen 18, the creamy solder corresponding thereto is pushed into the through hole, and the excess creamy solder is scraped off by the squeegee 162 located on the upstream side. Fills the through hole.

The push-out plate 230 is lowered as the creamy solder is pushed out.
3, the air pressure is controlled so that the creamy solder is pushed out at a preset pressure, so that the creamy solder is always pushed out at the set extrusion pressure even if the creamy solder is reduced.

After the printing of one printed circuit board 12 is completed, the squeegee 162 is once lifted and moved to the screen 18
And the printed circuit board 12 is unloaded. The substrate support base 40 is lowered, the printed circuit board 12 is lowered and separated from the screen 18, and the supply of negative pressure to the substrate support base 40 is blocked while the printed circuit board 12 is supported by the substrate conveyor 14. , The printed circuit board 12 is released. Then, the board support base 40 is further lowered to separate from the printed board 12, and the printed board 1
2 is carried out by the board conveyor 14.

When the squeegee 162 is lifted and separated from the screen 18, the load sensor 148
The total weight of the print head 150 is applied downward, and the load sensor 148 is in a state of detecting the total weight W of the print head 150. When the printing material container 400 is raised and the squeegee 162 is separated from the screen 18,
Both of the two air chambers of the air cylinder 222 for extrusion are opened to the atmosphere, and the creamy solder does not remain on the screen 18, and together with the printing agent container 400, the screen 18
Move away from The control device 130 calculates the remaining amount of the cream-like solder from the detection value of the load sensor 148 in this state as described above, and if the remaining amount is larger than the lower limit value, the squeegee 162 is brought into contact with the screen 18 again, Printing device 22
Is moved in the opposite direction to the previous printing, and the cream solder is printed on the next printed circuit board 12.

When the remaining amount of the creamy solder becomes less than the set lower limit weight, the print head 1 is replenished to replenish the creamy solder.
50 is moved to the printing material supply position. And FIG.
As shown in FIG. 1, the second plate member 404 is rotated by the rotation device 490, and the cream-like solder is supplied into the printing agent chamber 406 by the printing agent supply device 570.

The cleaning of the screen 18 will be described. In the screen cleaning device 24, the cleaning of the screen 18 is
When the use of the screen 18 is stopped, the printing is temporarily stopped, the reference mark provided on the screen 18 is read, the creamy solder is printed on a certain number of the printed circuit boards 12 during the screen printing, This is performed when the execution of cleaning is instructed, when a defective print state is detected, or the like. Therefore, in the screen cleaning routine, first, in step 1 (hereinafter abbreviated as S1), it is determined whether or not the use of the screen 18 is completed. When the screen 18 is replaced, for example, when the cream-like solder is printed on the printed circuit board 12 using the same screen 18 and the screen 18 is replaced,
Alternatively, the screen printing itself by the screen printing machine is completed. Whether or not the use of the screen 18 is finished,
For example, it can be known from the execution status of the creamy solder printing program (whether or not the printing of the creamy solder on the planned number of printed boards 12 has been completed), and if the use of the screen 18 is completed, the determination result of S1 is YES. And S7
Is executed to clean the screen 18.

If the use of the screen 18 is not finished, S1
The result of the determination is NO, and it is determined in S2 whether screen printing is temporarily stopped. For example, although screen printing is in progress, if there is time until the printed circuit board 12 on which creamy solder is printed next is carried in due to reasons such as the production line, screen printing is temporarily stopped. Whether it is a pause or not can be known from the information exchanged in the production line including screen printing, and if it is a pause, S7 is executed to clean the screen 18.

If the screen printing is not paused, S2
The result of the determination is NO, and the screen 18 is displayed in S3.
It is determined whether or not the reference mark of 1 is read.
If the reference mark is read, the determination result in S3 is YES, S7 is executed, and the screen 18 is cleaned. If the screen 18 is dirty, the fiducial mark cannot be read accurately, so the screen 18 is cleaned.

The screen cleaning in S7 will be described. This screen cleaning includes cleaning sheet 710 and wiping sheet 82.
0, ultrasonic vibrator 632, movable cleaning agent supply member 644,
Fixed cleaning agent supply member 670, cleaning sheet side drying device 6
90, scraping member 874, wiping sheet pressing member 860,
This is done by using all of the wiping sheet side drying devices 880 and moving them at a low speed. The screen cleaning pattern executed in S7 is a low speed screen cleaning pattern and is a normal cleaning pattern. When cleaning the screen, the slide 80 is moved to the retracted position where the cleaning head 620 retracts. Then, the cleaning head 620 is disengaged from the screen support base 52 and is connected to the wiping head 890, so that the cleaning head 620 moves integrally in the screen cleaning direction.

Next, the cleaning sheet feeding air cylinder 7
34, the piston rods 748 and 834 of the wiping sheet feeding air cylinder 832 are respectively expanded and contracted a plurality of times, and the cleaning sheet 710 and the wiping sheet 820 are fed. The cleaning sheet 710 is a portion located at the cleaning position which is a position on the ultrasonic vibrator 632 and the fixed cleaning agent supply member 670. The cleaning surface soiled by the previous cleaning is wound up and the clean surface is the cleaning position. The cleaning agent is supplied to the movable cleaning agent supply member 644 during this feeding, and the cleaning sheet 710 is impregnated with the cleaning agent. The wiping sheet 820 is a portion located at the wiping position pressed by the wiping sheet pressing member 860 and the scraping member 874. Located in position.

After feeding, the cleaning head 620 is raised and the wiping head 890 is lowered, and the screen 18 is sandwiched between the cleaning sheet 710 and the wiping sheet 820. The cleaning head 620 is lifted by moving the rod 772 by the cleaning head lifting air cylinder 780 and rotating the first and second links 774, 776, and the cleaning sheet 710 is moved to the substrate contact surface of the screen 18. 590 is contacted. In the wiping head 890, when the lift table 804 is lowered, the wiping sheet 820 causes the printing material pressing surface 59 of the screen 18 to move.
4.

The lifting table 804 is used for the wiping sheet pressing member 8
After 60 contacts the ultrasonic vibrator 632 through the wiping sheet 820, the screen 18 and the cleaning sheet 710,
It can be lowered a small distance. This lowering is the spring 86
8 is compressed and the scraping member 874 is elastically deformed to allow the wiper sheet 820, the screen 18, the cleaning sheet 710, and the ultrasonic vibrator 632.
Are elastically pressed against each other. The ascending end position of the cleaning head 620 is determined by the rotation angle of the first and second links 774, 776, and even if there is an assembly error or the like, the cleaning head 620 is lifted by the cleaning sheet 710 on the screen. It is set to an amount that will not be insufficient for contacting 18. That is, the amount of rise of the cleaning head 620 is always set to be slightly larger, and the compression deformation of the spring 868 and the elastic deformation of the scraping member 874 means that the cleaning head 620 is excessively raised. Both the excessive lowering amount of the lifting platform 804 is absorbed.

When the cleaning sheet 710 and the wiping sheet 820 are brought into contact with the screen 18, the cleaning agent is supplied to the movable cleaning agent supply member 644 and the fixed cleaning agent supply member 670, and the entire cleaning sheet 710 is sufficiently cleaned. While keeping the agent held, the air injection member 69
2, 882 is supplied with air and the ultrasonic vibrator 632 is vibrated, and the cleaning head 620 and the wiping head 89
0 is moved along the screen 18 by the squeegee moving device 94.

The cleaning head 620 and the wiping head 890 are
Moved at a low constant speed. When the use of the screen 18 is finished, when the screen printing is paused, and when the reference mark of the screen is read, there is sufficient cleaning time, and the cleaning head 620 and the wiping head 890 are moved at a low speed to clean the screen 18 carefully. Can be done. The cleaning head 620 is the screen support base 5.
2, the cleaning head 620, the pallet 598, and the like have a sufficient gap between the screen 18 and the substrate conveyor 14 so that the cleaning head 620, the pallet 598, and the like can move, and thus the substrate 18 and the substrate conveyor 14 do not interfere with each other.

The cleaning sheet 710 is impregnated with the cleaning agent, and the cleaning agent is constantly supplied by the fixed cleaning agent supply member 670 on the downstream side in the moving direction.
The cleaning sheet 710 does not dry during cleaning. Note that the cleaning agent supplied from the movable cleaning agent supply member 644 to the cleaning sheet 710 but not absorbed by the cleaning sheet 710 is received by the pallet 666 and supplied to the cleaning sheet 710 from the fixed cleaning agent supply member 670. The cleaning agent that has been absorbed by the cleaning sheet 710 and has dropped off is received by the pallet 598.

A part of the cream-like solder attached to the inner peripheral surface of the through hole of the screen 18 is blown off by the air jetted from the air jetting member 692 before the cleaning sheet 710 is contacted and washed. Cleaning sheet 7
10 is brought into contact with the substrate contact surface 590 and moved while being vibrated by the ultrasonic vibrator 632, and the creamy solder adhered to the substrate contact surface 590 and the inner peripheral surface of the through hole moves inside the substrate contact surface 590 and the through hole. It is separated from the peripheral surface, diffuses into the cleaning agent, and is absorbed and removed by the bubbles and fibers inside the cleaning sheet 710.

The cleaning agent held on the cleaning sheet 710 is
The vibration gives kinetic energy to move it into the through hole of the screen 18 or to the side of the screen 18 opposite to the side where the cleaning sheet 710 is brought into contact. for that reason,
The cream-like solder attached to the printing agent pressing surface 594 is scraped off by the scraping member 874 before being wiped off by the wiping sheet 820, and the screen 18
Is vibrated by the ultrasonic vibrator 632, is separated from the printing material pressing surface 594, diffuses into the cleaning material, and is wiped off by the wiping sheet 820. The air is absorbed in the air bubbles and fibers inside the wiping sheet 820.
Further, the creamy solder attached to the inner peripheral surface of the through hole of the screen 18 also diffuses in the cleaning agent and is wiped off by the wiping sheet 820. The printing agent pushing surface 594 is wetted by the cleaning agent, but the air ejecting member 88 of the wiping head 890.
It is dried by the air jetted from 2.

Cleaning head 620 and wiping head 890
Has been moved to the other end of the screen 18, the movable cleaning agent supply member 644, the fixed cleaning agent supply member 6
The supply of the cleaning agent to 70 is stopped, and the ultrasonic vibrator 632
Is stopped, the air supply to the air injection member 882 is cut off, and the cleaning sheet 710 and the wiping sheet 820 are separated from the screen 18, and then the cleaning head 620 and the wiping head 890 are cleaned. To the starting position,
That is, it is returned to the retracted position that was retracted before cleaning. During this time, air is jetted from the air jetting member 692 of the cleaning head 620 to dry the substrate contact surface 590. Air may be jetted from the air jetting member 882 to further dry the printing material pressing surface 594 of the screen.

After returning to the cleaning start position, the connecting device 90
The engaging pin 916 of No. 0 is disengaged from the engaging hole 934 to release the connection between the cleaning head 620 and the wiping head 890, and the engaging pin 922 is fitted in the engaging hole 940. Are locked to the screen support base 52.

The number of times of cleaning is increased, and the cleaning sheet 710 and the wiping sheet 820 wound by the winding shafts 722 and 824 are wound.
If the diameter of the cleaning sheet increases, the cleaning sheet feed air cylinder 7
34, the feed length of the cleaning sheet 710 and the wipe sheet 820 is increased by expanding and contracting the piston rods 748 and 834 of the wipe sheet feeding air cylinder 832 once, and the feed length at the time of sheet replacement is increased. However, cleaning sheet 710,
Since the length required for cleaning the wiping sheet 820 is constant, it is useless if the feed length increases, and the piston rods 748, 834 of the cleaning sheet feeding air cylinder 734 and the wiping sheet feeding air cylinder 832 are wasteful. The number of expansions and contractions of is reduced.

The controller 130 controls the cleaning sheet 710 and the wiping sheet 820 from the beginning of use of the cleaning sheet feeding air cylinder 734 and the wiping sheet feeding air cylinder 8.
The number of expansions and contractions of the 32 piston rods 748 and 834 is stored, and the winding amount of the winding shafts 722 and 824 can be known. Therefore, if the winding amount exceeds the set value and the size of the sheet used for cleaning the sheet can be changed even if the number of times of expansion and contraction is reduced by one, the number of times of expansion and contraction is reduced by one. When the cleaning is further performed and the winding amount is increased, the number of times of expansion and contraction is reduced so that the sheet is not wastefully used. The winding amount is divided into multiple stages, and the piston rods 748, 8
The number of expansions and contractions of the piston rods 748 and 834 is set and stored in the ROM of the computer of the controller 130, and the number of expansions and contractions of the piston rods 748 and 834 is determined thereby.

If neither the end of use of the screen, the suspension, nor the reading of the fiducial mark on the screen 18 is executed, the determination results of S1 to S3 are all NO and S4 is executed. It is determined whether or not there is an instruction to perform. For example, when the operator sees the printed circuit board 12 on which the creamy solder is printed and finds that it is better to clean the screen 18 due to a situation such as a shortage of the printing amount, it may be interrupted during the continuous printing. Even if there is, a cleaning execution command is input using the input device 954. As a result, the determination result of S4 becomes YES, and the screen cleaning of S8 is executed.

If there is no instruction to perform cleaning by the operator, S
The determination result of 4 is NO, and it is determined in S5 whether or not the print result is defective. This determination is performed based on the detection result of the print result detection device. If the print result is defective even during continuous printing and the cause of the defect is the need to clean the screen 18, the determination result of S5 is YE
Then, the screen is cleaned in S8.

The screen cleaning in S8 is different from the screen cleaning in S7 only in that the moving speed of the cleaning head 620 and the wiping head 890 is made higher. When the screen 18 is cleaned during continuous printing, the moving speed is increased in order to shorten the print interruption time, and the members used for cleaning are all the same. Here, to increase the moving speed means to partially increase the moving speed during the cleaning of one screen 18 so that it becomes higher on average. The screen cleaning pattern executed in S8 is a high-speed screen cleaning pattern, which is a normal cleaning pattern.

The size of the through holes formed on the screen 18 is not constant, and there are large through holes and small through holes. If the through-hole is large, the amount of cleaning agent mixed in the through-hole is large, the creamy solder attached to the inner peripheral surface easily diffuses, and the cleaning sheet or the wiping sheet easily enters the through-hole. Even if it is high, it is sufficient to remove the creamy solder attached to the inner peripheral surface of the through hole, the substrate contact surface 590, and the printing agent pressing surface 594. However, when the through hole is small, the amount of the cleaning agent mixed in the through hole is small, and it is difficult for the cleaning sheet or the wiping sheet to enter the through hole. Therefore, the moving speed is reduced and the creamy solder is carefully removed. It is necessary to do so. The distribution of the size of the through holes in the moving direction of the cleaning head 620 and the wiping head 890 of the screen 18 is known from the manufacturing data of the screen 18, and the speed distribution is set based on that, and the squeegee moving servo motor 92 uses the speed distribution. It is driven according to the velocity distribution.

If there is no cleaning instruction from the operator and the print result is not defective, the determination results of S4 and S5 are NO, and S6
A certain number of printed circuit boards 1 during continuous printing in
It is determined whether or not the printing on the second sheet has been completed. This determination is made based on the print program of the printed circuit board 12, and if the printing on the fixed number of printed circuit boards 12 is completed, the determination result of S6 becomes YES and S9.
Screen cleaning is performed.

A cleaning sheet 71 is used for cleaning the screen in S9.
It is performed by using only 0 and moving the cleaning sheet 710 at a constant high speed. Also in this case, the moving speed of the cleaning sheet 710 is partially increased according to the size of the through hole formed in the screen 18 during the cleaning of one screen 18, and is increased on average. To be done. The screen cleaning pattern executed in S9 is a high-speed screen cleaning pattern and a simple cleaning pattern. Therefore, when cleaning the screen, the slide 80 is moved to the retracted position. Then, the cleaning head 620 is disconnected from the screen support base 52 and is connected to the wiping head 890.

Then, the cleaning sheet 710 is sent in the same manner as the screen cleaning in S7. At this time, the cleaning agent is not supplied. After the feeding, the cleaning head 620 is lifted to move the cleaning sheet 710 to the substrate contact surface 59 of the screen 18.
0 is touched. The wiping head 890 is not lowered, the wiping sheet 820 is not brought into contact with the printing material pressing surface 594, and the air is not ejected from the air ejecting member 882. Then, the cleaning head 620 becomes the wiping head 890.
The squeegee moving device 94 is used to move the squeegee along the screen 18 at high speed, and the creamy solder attached to the substrate contact surface 590 of the screen 18 is wiped off. Wiping is performed using only the cleaning sheet 710, and neither air injection, cleaning agent supply, nor ultrasonic vibration is performed.
When wiping the substrate contact surface 590 with the cleaning sheet 710,
If the cleaning sheet 710 is moved at a high speed, the creamy solder can be wiped off sufficiently, and the printing interruption time can be shortened.

If the cleaning head 620 is moved to the other end of the screen 18 together with the wiping head 890, the cleaning head 620 and the wiping head 890 start cleaning after the cleaning sheet 710 is separated from the screen 18. It is returned to the position (retracted position). After returning, washing head 6
20 is disconnected from the wiping head 890, and the cleaning head 620 is locked to the screen support base 52. When the screen 18 is cleaned using only the cleaning sheet 710, the cleaning device 592 functions as a wiping device.

As described above, according to the screen cleaning apparatus of the present embodiment, since the creamy solder is contained in the printing material container 400, it is not necessary to evacuate it during cleaning.
Further, since the cleaning device 592 and the wiping device 596 simultaneously supply, clean, and wipe the cleaning agent, the time required for cleaning can be shortened. Furthermore, the cleaning sheet 710 and the wiping sheet 820 are brought into contact with the screen 18 to perform cleaning, and the dirty cleaning sheet 710 and the wiping sheet 8 are cleaned.
Since 20 is discarded, a cleaning device 592 and a wiping device 59
The members constituting 6 are hardly contaminated by the cream-like solder, and it is almost unnecessary to stop the operation of the screen printer for cleaning the ultrasonic vibrator 632, and the screen 18 is attached to the screen support base 52. Since it is possible to clean the screen 18 as it is, it is possible to easily clean the screen 18 during continuous printing, the printing efficiency of the screen printing including the cleaning of the screen 18 is improved, and it is possible to continuously operate for a long time. can get. Further, it is possible to obtain a screen printing machine in which different screen cleaning patterns are automatically selected according to the cleaning start condition, the cleaning is automatically performed, and the screen printing including the cleaning is automatically performed.

As is clear from the above description, in the present embodiment, the ultrasonic vibrator 632 constitutes an ultrasonic vibration member, and the movable cleaning agent supply member 644, the fixed cleaning agent supply member 670, and the supply members 644 thereof. , 670, a cleaning agent supply source for supplying a cleaning agent, and a movable cleaning agent supply member 64.
A rotation arm 650 as a cleaning agent supply member holding device that holds the No. 4 movably between the pressing position (supply position) and the release position (retraction position) constitutes a cleaning agent supply device and forms a supply rotating body. Shaft 712, guide rollers 718, 72
0, the winding shaft 722, the ultrasonic vibrator 632, the movable cleaning agent supply member 644, and the fixed cleaning supply member 670 that form the winding rotating body form a cleaning sheet holding device. The movable cleaning agent supply member 644 and the fixed cleaning supply member 670 double as a cleaning agent supply device and a cleaning sheet holding device. In addition, the ratchet wheel 732, the rotating body 738,
The support shaft 740, the rotating plate 742, the ratchet pawl 744, the link 750, the cleaning sheet feeding air cylinder 734, and the like constitute a rotary drive device, and together with the supply shaft 712 and the take-up shaft 722, a cleaning sheet feeding device. . Further, the supply shaft 822, the guide rollers 823, 825, and the winding shaft 82.
4, the wipe sheet holding member 860 and the scraping member 874 constitute a wipe sheet holding device. Further, the ratchet wheel 842, the rotating plate 838, the ratchet pawl 840, the link 836, the wiping sheet feeding air cylinder 832, and the like constitute a rotation driving device, and together with the supply shaft 822 and the winding shaft 824, the wiping sheet feeding device is provided. I am configuring. Further, the number of times the piston rod 748 of the cleaning sheet feeding air cylinder 734 of the control device 130 expands and contracts is counted to determine the winding shaft 7
A portion of the 22 for reducing the number of times of expansion and contraction according to the winding diameter constitutes a cleaning sheet feed length adjusting device, and the piston rod 834 of the wipe sheet feeding air cylinder 832 of the control device 130.
The portion that counts the number of times of expansion and contraction and reduces the number of times of expansion and contraction according to the winding diameter of the winding shaft 824 constitutes the wiper sheet feeding length adjusting device. Further, a portion of the control device 130 that stores the screen cleaning routine of the computer constitutes a storage means, and a portion of the control device 130 that executes the screen cleaning routine is a wiping sheet control screen cleaning control means that is one type of screen cleaning control means. , Constitutes a cleaning control means when the screen cleaning start condition is satisfied.

A screen cleaning device 1000 according to an embodiment of the ninth invention will be described with reference to FIG. The screen cleaning apparatus 1000 has a wiping head 1002, and the wiping head 1002 is arranged on the substrate contact surface 590 side of the screen 18. The wiping head 1002 is similar to the cleaning head 620 of the cleaning device 592 in the pallet 1004.
It is provided above and is lifted and lowered by a lifting device 1006. On the pallet 1004, similarly to the cleaning device 592, two pairs of pedestals (not shown) each including two pairs are erected at two positions separated in the screen width direction and fixed to the pedestals. In the guide block, a pair of guide rails (not shown) fixed to the lower surface of the screen support base 52 are slidably fitted.

The wiping head 1002 comprises a pair of supporting members 1.
010 (only one shown in the figure). These support members 1010 have a plate shape and are arranged on both sides of the pallet 1004 which are separated from each other in the screen width direction. A supply shaft support portion 1012 is provided on one side of each of the support members 1010 in the screen printing direction, and both end portions of the supply shaft 1014 are parallel to the screen width direction and are on the surface of the screen 18. It is rotatably supported about parallel axes.

A wiping sheet 1016 is attached to the supply shaft 1014.
Is wrapped around. The wiping sheet 1016 is the same as the wiping sheet 820, is formed of paper, and has a strip shape having a width substantially equal to the width of the screen 18, and the supply shaft 10 is provided.
After being pulled out from the roller 14, it is wound on the guide roller 1018 and the pressing roller 1020 made of silicon rubber, and then wound by the winding shaft 1022. The wiping sheet 1016 is
The take-up shaft 1022 is such that the surface of the screen 18 that is brought into contact with the substrate contact surface 590 and wipes off dirt is the inside.
Is wrapped around. Both the guide roller 1018 and the pressing roller 1020 are long in the width direction of the screen,
It is rotatably attached to roller shafts 1024 and 1026 that are rotatably supported by a pair of support members 1010 so as to be rotatable about an axis parallel to the rotation axis of the supply shaft 1014. The pressing roller 1020 has a large diameter, and a part of the outer peripheral side thereof is projected upward from the upper surface of the support member 1010.

The winding shaft 1022 comprises a pair of supporting members 101.
It is rotatably supported around an axis parallel to the rotation axis of the supply shaft 1014. One end of the take-up shaft 1022 has the same shape as the take-up shaft 722 of the cleaning device 592.
One of the support members 1010 is rotatably fitted to a rotating body 1030, which is relatively non-rotatably fitted, and the other end is fitted to a recess formed in the other support member 1010. It is prevented from being pulled out. The rotator 1030 has a bottomed cylindrical shape, and a take-up lever 1034 is rotatably fitted to a protruding end of the support shaft 1032 fixed to the bottom from the rotator 1030. The take-up lever 1034 has a long plate shape, is rotatably fitted to the support shaft 1032 at a substantially central portion in the longitudinal direction, and is provided between one end portion in the longitudinal direction and the support member 1010. A tension coil spring 1036 as an elastic member, which is a kind of biasing means, biases the cleaning sheet in a direction opposite to the cleaning sheet winding direction indicated by an arrow.

The support shaft 1032 and the take-up lever 1034.
A first one-way clutch (not shown) that prevents relative rotation of the support shaft 1032 with respect to the winding lever 1034 in the cleaning sheet winding direction but allows relative rotation in the opposite direction is provided between the support shaft 1032 and the support shaft 1032. A second one-way clutch that allows rotation of the support shaft 1032 in the cleaning sheet winding direction but blocks rotation in the opposite direction is provided between the (rotating body 1030) and the support member 1010.

The support member 1010 has another bracket 10
40 is fixed, and a portion of the support shaft 1032 outside the portion where the winding lever 1034 is fitted is fitted to the bracket 1040 so as to be relatively rotatable. A stopper protrusion 1042 is provided on the upper end of the bracket 1040 so as to extend toward the take-up lever 1034.
The rotation limit of the winding lever 1034 based on the bias of the tension coil spring 1036 is defined by abutting the stopper protrusion 1042.

An adjusting bolt 1046 is screwed onto the pallet 1004. A base 1048 is fixed to the pallet 1004, and a bracket 1050 is attached.
The adjusting bolt 1046 is screwed in the bracket 1050 in the vertical direction, and
The tension coil spring 1036 of No. 4 is located below the end opposite to the side where the tension coil spring 1036 is locked.

The elevating device 1006 for elevating the wiping head 1002 is constructed in the same manner as the elevating device 622 of the above embodiment, and a pair of rods fitted to the base 1048 so as to be relatively movable in the screen width direction. By moving 1054 in the axial direction by an air cylinder for raising and lowering a wiping head (not shown), one first link 1056 and two second links 1058, which respectively configure four link pairs, are rotated. , The wiping head 1002
A rising end position (a contact position and a cleaning position) where the portion of the wiping sheet 1016 supported by the pressing roller 1020 contacts the substrate contact surface 590 of the screen 18;
It is moved up and down with respect to a descending end position (a separated position, which is a non-cleaning position) separated from the substrate contact surface 590. One end of the first link 1056 is rotatably connected to the rod 1054, the other end is rotatably connected to the support member 1010, and one end of the second link 1058 is rotatably connected to the base 10.
48 is rotatably connected and the other end is a first link 105.
It is rotatably connected to an intermediate portion in the longitudinal direction of 6.

Although not shown, the connecting device 9
00, a locking device for engaging the wiping head 1002 and the like with the screen support base 52 is provided, and the wiping head 1002 and the pallet 1004 and the like are connected to the slide of the squeegee moving device when the screen is cleaned. In addition, the lock to the screen support base 52 is released, the connection with the slide is released at the time of screen printing, and the screen support base 52 is locked.

In the screen cleaning apparatus 1000 having the above-described structure, at the time of screen printing, the wiping head 1002, the pallet 1004, etc. are disconnected from the slide of the squeegee moving device, and the retracted position at one end in the screen printing direction. And is engaged with the screen support base 52. The wiping head 1002 is at the lower end position as shown in FIG.

At the time of cleaning the screen, the slide of the squeegee moving device is moved to the retracted position, the wiping head 1002, the pallet 1004, etc. are disengaged from the screen support base 52 and are connected to the screen. . Further, the wiping head 1002 is raised and the portion of the wiping sheet 1016 supported by the pressing roller 1020 is the substrate contact surface 590 of the screen 18.
Be contacted with. In this state, the slide is moved, the substrate contact surface 590 and the wiping sheet 1016 are moved relative to each other, and the creamy solder attached to the substrate contact surface 590 is wiped off by the wiping sheet 1016.

With the wiping head 1002 in the lower end position, as shown in FIG.
Comes into contact with the adjustment bolt 146, and the stopper projection 14
It is far from 2. When the wiping head 1002 is lifted, the take-up lever 1034 is rotated in the direction opposite to the cleaning sheet take-up direction by the urging force of the tension coil spring 1036, abuts on the stopper protrusion 1042, and is further wiped. When the take head 1002 is raised, the take head 1002 is separated from the stopper bolt 146. Support member 101
0, between the support shaft 1032 and the winding lever 1034,
Since the first and second one-way clutches are provided, the support shaft 1032 turns around the winding lever 1034, and the winding shaft 1
The 022 does not rotate and the wiping sheet 1016 is not rewound.

After cleaning the screen, the wiping head 1002 is lowered to separate the wiping sheet 1016 from the substrate contact surface 590 of the screen 18, and is moved to the descending end position, and then the wiping head 1002 is slid. Is moved to the retracted position (cleaning start position). Before the wiping head 1002 descends to the descending end position, the take-up lever 1
034 abuts on the adjusting bolt 1046, and the wiping head 1002 is further lowered from that state, so that the winding lever 1034 moves the tension coil spring 103.
It is rotated in the winding direction of the wiping sheet against the biasing force of 6. At this time, by the action of the first one-way clutch, the support shaft 1032 rotates together with the winding lever 1034, and the rotator 1030 and the winding shaft 1022 rotate to rotate the wiping sheet 101.
6 is rolled up. As a result, the portion of the wiping sheet 1016 that has become dirty due to cleaning is retracted from the pressing roller 1020, and the clean portion is positioned on the pressing roller 1020. Therefore, when cleaning the screen 18 next time, the clean surface of the wiping sheet 1016 is brought into contact with the substrate contact surface 590. Wiping sheet 10
The winding of the dirty portion of 16 is performed by the wiping head 1002 1
This is done by raising and lowering a number of times.

If the winding diameter of the wiping sheet 1016 on the winding shaft 1022 is increased, the winding amount is increased even if the rotation angle of the winding shaft 1022 is the same, which is wasteful. The fact that the winding amount has increased can be seen, for example, by looking at the portion of the wiping sheet 1016 between the pressing roller 1020 and the winding shaft 1022. This is because the length of the wiping sheet 1016 used for cleaning the screen 18 is constant, and the interval between the soiled portions becomes longer as the winding amount increases. If the winding amount increases, the operator may adjust the adjustment bolt 1046 to the bracket 1050.
To reduce the protruding length upward from the bracket 1050. As a result, the timing at which the take-up lever 1034 comes into contact with the adjustment bolt 1046 is delayed when the wiping head 1002 descends, the rotation angle of the take-up lever 1034 is reduced, and an increase in the take-up amount is avoided.

As described above, according to the screen cleaning apparatus 1000 of the present embodiment, the screen 18 can be cleaned easily and quickly only with the wiping sheet 1016. Further, since the wiping sheet 1016 is wound up by using the elevation of the wiping head 1002, the winding shaft 102 is wound.
The device can be configured easily and inexpensively as compared with the case where a dedicated drive source for rotating the 2 is provided.
Furthermore, since the wiping sheet 1016 is wound around the take-up shaft 1022 so that the surface on the dirty side is on the inside, the dirt adhering to the wiping sheet 1016 is a constituent member of the screen cleaning device, the screen printing machine, or the operator. And the wiping sheet 1016 wound around the winding shaft 1022.
Can be easily processed.

As is apparent from the above description, in the present embodiment, the pressing roller 1020 constitutes a pressing device, and the pressing roller 1020, the supply shaft 1014 and the winding shaft 10 are provided.
22 and the guide roller 1018 constitute a wiping sheet holding device, and the support shaft 1032, the winding lever 1034, the tension coil spring 1036, and the adjustment bolt 104.
6, the lifting device 1006 constitutes a wipe sheet feeding device. The adjusting bolt 1046 also constitutes a wipe sheet feeding length adjusting device.

In the embodiment shown in FIGS. 1 to 24, the cleaning agent is supplied at two points, the upstream side and the downstream side of the ultrasonic vibrator in the cleaning sheet feeding direction. The cleaning agent supply member may be provided in only one of the members, and the cleaning agent may be supplied in only one of the members. When the cleaning agent is supplied only to the downstream side, the upstream side portion in the moving direction of the cleaning sheet is dry, and the screen has a portion where the cleaning agent is impregnated with the cleaning agent It is possible to wipe off and omit drying after cleaning. Alternatively, a cleaning agent supply member is provided at each of the upstream side and the downstream side of the ultrasonic vibrator in the cleaning sheet feeding direction, and the cleaning agent is supplied only to the upstream cleaning agent feeding member when the cleaning sheet is fed, When the cleaning sheet is moved with respect to the screen for cleaning, the cleaning agent may be supplied only to the cleaning agent supply member on the downstream side.

Although the scraping member 874 of the wiping head 890 is made of rubber in the embodiments shown in FIGS. 1 to 24, it may be made of metal. Since the scraping member 874 is brought into contact with the screen 18 via the wiping sheet 820, the cream-like solder can be reliably scraped off without damaging the screen 18.

Furthermore, the cleaning sheet 710 and the wiping sheet 820 in the embodiment shown in FIGS.
The cleaning surface and the wiping surface are renewed every time the cleaning is performed, but they may be sent during cleaning. The cleaning sheet 710 and the wiping sheet 820 are moved while being moved along the screen 18.

Further, the cleaning sheet 710 and the wiping sheet 82
The feed amount of 0 is the air cylinder 832 for feeding the wipe sheet.
Although the number of times the piston rods 748, 834 of the cleaning sheet feeding air cylinder 734 are expanded and contracted is reduced according to the winding amount, they are made substantially constant, but the stopper members 756, 846 are attached to the brackets 758, 844. By adjusting the amount of screwing to adjust the extended end positions of the piston rods 748, 834 and reducing the rotation angle of the winding shafts 722, 824 due to one expansion / contraction of the piston rods 748, 834, the piston rods 748, 834 Even if the number of expansions and contractions of 834 is the same, the cleaning sheet 710 and the wiping sheet 8
The feed amount of 20 may be substantially constant. In this case, the winding amount may be estimated from the number of expansions and contractions of the piston rods 748 and 834, and the operator may be notified that the extension end position of the piston rods 748 and 834 should be changed, or the stopper member is automatically operated. A device that adjusts the screwing amount by rotating it automatically may be provided and automatically adjusted,
Alternatively, the operator may watch the winding amount and adjust the extension end position according to the amount of the winding amount. Or, even if the winding amount increases and the feed length increases, the feed length is not adjusted,
You can leave it as it is.

The screen cleaning device 1000 shown in FIG.
In the above, the feed length of the wiping sheet 1016 is adjusted by the operator adjusting the screwing amount of the adjustment bolt 1046, but it may be automatically adjusted. For example, the wiping sheet 1016 is calculated from the number of times of cleaning (for example, the number of times the wiping head is moved up and down).
The winding amount of the
A device for automatically rotating 6 is provided, and the adjusting bolt 1046 is automatically rotated to automatically adjust the rotation angle of the winding shaft 1022.

Further, the screen cleaning device 1 shown in FIG.
In 000, the soiled portion of the wiping sheet 1016 was retracted by one elevating / lowering of the wiping head 1002, but the contact length of the wiping sheet with the screen during wiping is long, When the retracted (replaced) length is long, the wiping head may be moved up and down a plurality of times to cause the winding shaft to perform the winding operation a plurality of times. If the wiping head is moved up and down multiple times, the dirty part of the wiping sheet will come into contact with the screen, but when the cleaning of the dirty screen is started, the wiping sheet is sent or the screen is removed. If you do not have it, send it at that time.

Further, in each of the above-described embodiments, the cleaning head 620 and the wiping heads 890, 1002 can be reciprocated once when cleaning the screen 18 once, but they can be reciprocated a plurality of times. Good. Wiping head 1
In 002, the wiping sheet 1016 is also used on the return path.
May be brought into contact with the screen 18 to clean the screen 18. In addition, the cleaning head 620 cleans the screen 18 in both the forward and backward paths,
You may make it wipe off by 90. In this case, it is necessary to provide each of the cleaning head 620 and the wiping head 890 with a drying device that dries the substrate contact surface 590 and the printing material pressing surface 594 that have been wetted by the cleaning agent during the backward movement. The substrate contact surface 590 and the printing agent pressing surface 594 may not be dried on the outward path, and may be dried only on the return path.

Further, the screen may be cleaned by moving only one way without reciprocating the cleaning head and the wiping head. In this case, the retracted positions are set on both sides of the screen in the direction parallel to the screen cleaning direction, and the engaged portions that constitute the locking device are provided at the portions corresponding to both the retracted positions of the screen support base. The cleaning head or the wiping head of the embodiment shown in FIG. 25 may be locked to the screen support base at the retracted position on the side where cleaning has been completed. Further, when the screen is cleaned using the cleaning head and the wiping head as in the embodiment shown in FIGS. 1 to 24, the cleaning head and the wiping head are moved in only one way to clean and wipe the screen.
The structure is such that the drying can be completed. For example, in the cleaning head,
A cleaning sheet side drying device is provided on each of the upstream side and the downstream side of the contact portion between the cleaning sheet and the screen in the moving direction during screen cleaning, and the wiping head is provided with the wiping sheet and the screen in the moving direction during screen cleaning. A wiping sheet side drying device is provided on each of the upstream side and the downstream side of the contact portion.

Further, in the embodiment shown in FIGS. 1 to 24, the cleaning sheet 710 and the wiping sheet 820 are designed to be fed prior to cleaning.
May be sent after cleaning. The cleaning sheet 710 is impregnated with the cleaning agent at the time of feeding. Therefore, if the cleaning agent is sent after cleaning, the cleaning agent will be dried before the next cleaning. Therefore, the cleaning sheet is sent before cleaning. Sheet 820
The cleaning agent may not be soaked in the cleaning agent, so it may be sent after cleaning.

Further, a cleaning head may be provided on both sides of the screen, and a cleaning agent may be supplied from both sides and ultrasonic vibration may be performed for cleaning. When the printing agent is stored in the printing agent container like the screen printing machine of the above-described embodiment, the printing agent is not left on the screen, so that the printing agent is not retreated to the retreat position when cleaning the screen, A cleaning agent can be supplied to the printing agent pushing surface side of the screen for cleaning. When the screen is arranged horizontally, the cleaning head provided on the printing agent pressing surface side can supply the cleaning agent downward, and the supply is easy.

Further, in the embodiment shown in FIGS. 1 to 24, the cleaning sheet and the wiping sheet are made of paper, but it is sufficient that they have porosity, and in addition to paper, they are foamed of non-woven fabric, sponge or the like. The body etc. can be adopted. The same applies to the wiping sheet of the embodiment shown in FIG.

Further, in the embodiment shown in FIGS. 1 to 24, as in the embodiment shown in FIG. 25, the cleaning sheet 710 and the wiping sheet 820 are wound so that the surfaces with the stains are on the inside. It may be wound around the take-up shafts 724 and 824.

Further, in the embodiment shown in FIGS. 1 to 24, the movable cleaning agent supply member 644 and the fixed cleaning agent supply member 67 are used.
Although the cleaning agent is supplied from different cleaning agent supply sources to 0 and 0, respectively, the cleaning agent supply source is common and the cleaning agent is separately supplied by opening and closing two electromagnetic opening / closing valves. It may be blocked. Alternatively, the cleaning agent supply source and the electromagnetic opening / closing valve may be common, and the cleaning agent may be supplied and shut off at the same time.

Further, in the embodiment shown in FIGS. 1 to 24, the wiping head 890 and the wiping head lifting device are provided on the slide 80 provided with the print head 150 and the like, and together with the print head 150 and the like during screen printing. However, like the cleaning head 620 and the like, a member whose position is fixed by the locking device, such as the screen support base 52, in the retracted position that does not interfere with the screen printing during the screen printing, such as the cleaning head 620. The print head 1 is locked by the print head 1 and is moved to the retracted position.
Only 50 and the like are moved by the slide 80 for screen printing, and the wiping head 89 is used for cleaning the screen.
0 may be connected to the slide 80 by a connecting device and moved by the squeegee moving device 94.

Further, in each of the embodiments shown in FIGS. 1 to 24 and 25, the screen cleaning device is provided in the screen printing machine, and the screen is cleaned while being attached to the screen printing machine. However, the screen cleaning device may be provided separately from the screen printing machine.

Further, in each of the above embodiments, the cleaning head 620 and the wiping heads 890, 1002 are provided on the screen 80 on the slide 80 which moves during screen cleaning.
However, a member that moves along the screen may be provided on a member that approaches and separates from the screen, and a cleaning head and a wiping head may be provided on the member.

Further, in the cleaning device, an air injection member is provided on the upstream side of the contact portion between the cleaning sheet and the screen in the moving direction when the cleaning sheet is brought into contact with the screen for cleaning, and while the cleaning sheet moves, Air may be jetted onto the screen to dry the screen. Further, it is not essential to provide the wiping device in the embodiments shown in FIGS. 1 to 24 and may be omitted.

Further, in the embodiment shown in FIGS. 1 to 24, the cleaning head 620 and the wiping head 890 are respectively
It may be moved by a dedicated moving device different from the squeegee moving device 94, or the cleaning head 620 and the wiping head 890 may be moved by a common moving device different from the squeegee moving device 94.

Furthermore, in the embodiment shown in FIG.
The wiping head, the pallet and the like may be moved by a dedicated moving device provided separately from the squeegee moving device.

Furthermore, in the embodiment shown in FIGS. 1 to 24, the reading of the reference mark is performed when the screen is replaced, and the cleaning of the screen is performed at a low speed. The screen may be cleaned when reading is performed.
For example, as described above, when the print result is detected and the print position is deviated from the regular position, one of the causes may be the position of the screen. Therefore, the reference mark on the screen may be read again, and any misalignment may be corrected, and the screen is cleaned prior to reading the reference mark. However, in this case, since it is in the middle of screen printing, it is desirable to perform cleaning in a short time, and only the wiping sheet is brought into contact with the printing agent pushing surface of the screen,
Clean with a screen cleaning pattern that moves at high speed. Alternatively, a cleaning sheet, an ultrasonic vibrator, and a cleaning agent supply device are used together with the wiping sheet, and the cleaning agent is moved at high speed to allow the cleaning agent to enter the printing agent pressing surface side and remove the creamy solder attached to the reference mark. You may do it.

Further, instead of the laser displacement sensor 592, C
You may make it image | photograph cream-like solder using a CD camera. In this case, it is desirable to use a color CCD camera to distinguish between the printed circuit board and the cream solder.

Further, in the embodiment shown in FIG. 25, two one-way clutches are provided so that the winding shaft 1022 does not rotate when the winding lever 1034 rotates in the direction opposite to the winding direction. However, for example, the winding shaft 10
If the winding resistance of the take-up shaft 1022 is prevented by the frictional resistance between the 22 (rotating body 1030) and the support member 1010, the take-up direction between the take-up shaft 1022 and the take-up lever 1034 may be changed. Only a one-way clutch that prevents relative rotation but allows relative rotation in the opposite direction to the winding direction may be provided. The friction resistance may be increased by providing a friction member.

Furthermore, the present invention can be applied to an apparatus and method for cleaning the screen of a screen printing machine that prints a printing agent other than cream solder such as an adhesive. In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a side view showing a screen printing machine equipped with a screen cleaning device for carrying out a screen cleaning method according to an eighth invention, which is an embodiment common to the first to seventh inventions.

FIG. 2 is a front view showing the screen printing machine.

FIG. 3 is a plan view showing the screen printing machine.

FIG. 4 is a front view showing a printing apparatus of the screen printing machine.

FIG. 5 is a diagram illustrating a circuit for supplying air to a contact load adjusting air cylinder that adjusts a contact load of the printing apparatus.

FIG. 6 is a side view showing the printing apparatus.

FIG. 7 is a side view showing another portion of the printing apparatus.

FIG. 8 is a plan view showing the printing apparatus.

FIG. 9 is a front cross-sectional view showing a positioning device that positions a first plate-shaped member forming a printing agent container of the printing device of the screen printing machine with respect to the second plate-shaped member.

FIG. 10 is an enlarged view showing a connecting portion between the second plate member and the rotating plate of the rotating device.

FIG. 11 is a diagram illustrating an operation of the printing apparatus when a printing agent is supplied.

FIG. 12 is a side view schematically showing the screen cleaning device.

FIG. 13 is a side view showing a cleaning device of the screen cleaning device.

FIG. 14 is a side view showing another portion of the cleaning device.

FIG. 15 is a front view showing a portion of the cleaning device where a cleaning sheet feeding device is provided.

FIG. 16 is a plan view (partial cross section) showing a portion of the cleaning device where a cleaning sheet feeding device is provided.

FIG. 17 is a plan sectional view showing a supply passage for a cleaning agent and air of the cleaning device.

FIG. 18 is a front view showing the cleaning device together with a screen support base.

FIG. 19 is a side view showing a wiping device of the screen cleaning device.

FIG. 20 is a front view showing a connecting device that connects the cleaning head of the cleaning device and the wiping head of the wiping device.

FIG. 21 is a side view showing the coupling device.

FIG. 22 is a plan view showing the coupling device.

FIG. 23 is a block diagram showing a part of the control device for controlling the screen printing machine, which is deeply related to the present invention.

FIG. 24 is a computer RO that constitutes the above control device.
7 is a flowchart showing a screen cleaning routine stored in M.

FIG. 25 is a side view showing a main part of a screen cleaning device according to an embodiment of the ninth invention.

[Explanation of symbols]

 18 screen 22 printing device 24 screen cleaning device 94 squeegee moving device 130 control device 592 cleaning device 596 wiping device 620 cleaning head 632 ultrasonic vibrator 644 movable cleaning agent supply member 670 fixed cleaning agent supply member 710 cleaning sheet 712 supply shaft 722 Winding shaft 730 Cleaning sheet feeding device 820 Wiping sheet 822 Supply shaft 824 Winding shaft 830 Wiping sheet feeding device 890 Wiping head 900 Connecting device 1000 Screen cleaning device 1002 Wiping head 1006 Lifting device 1014 Supply shaft 1016 Wiping sheet 1020 Pressing roller 1022 Take-up shaft 1046 Adjust bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Adachi No. 19 Chausan, Yamamachi, Chiryu City, Aichi Prefecture Fuji Machine Manufacturing Co., Ltd.

Claims (9)

[Claims] 1. An apparatus for cleaning a screen, comprising: an ultrasonic vibration member; and a cleaning agent supply device for supplying a cleaning agent between the ultrasonic vibration member and a screen for a screen printing machine. A cleaning sheet holding device for holding a porous cleaning sheet in contact with the screen is disposed between the sound wave vibrating member and the screen, and the cleaning agent supply device supplies the cleaning agent to the cleaning sheet. A screen cleaning device, which is provided in the. 2. The cleaning sheet is a belt-shaped sheet, and the screen cleaning device is provided rotatably around an axis and a supply rotary body around which the cleaning sheet is wound, and rotatably around another axis. The screen cleaning device according to claim 1, further comprising: a cleaning sheet feeding device having a winding rotary member that winds up the cleaning sheet and a rotation drive device that rotationally drives the winding rotary member. 3. A wiping sheet holding device for holding a porous wiping sheet in contact with the screen is provided on the opposite side of the screen from the ultrasonic vibrating member and the like. The screen cleaning device according to claim 1, wherein the screen cleaning device is a screen cleaning device. 4. The cleaning sheet holding device, the ultrasonic vibrating member, and the cleaning agent supply device are arranged on the side of the printing material contact surface of the screen that comes into contact with the printing material. The screen cleaning device according to any one of claims. 5. A contact / separation device for contacting and separating at least the ultrasonic vibrating member and the cleaning sheet from the cleaning surface of the screen, and at least an ultrasonic vibrating member contacting / separating device, and at least the ultrasonic vibrating member, the cleaning sheet and the screen. And a relative moving device such as an ultrasonic vibration member for relatively moving the screen in a direction parallel to the cleaning surface of the screen, and one of a plurality of preset screen cleaning patterns is selected, and at least the ultrasonic vibration member and the cleaning are selected. Screen cleaning control means for controlling the agent supply device, the contact / separation device such as an ultrasonic vibrating member, and the relative moving device such as an ultrasonic vibrating member according to the selected screen cleaning pattern to clean the screen. Claims 1, 2, 4
The screen cleaning device according to any one of 1. 6. A contact such as a wiping sheet for contacting and separating at least the wiping sheet and the screen.
A separation device, including a relative moving device such as a wiping sheet that relatively moves at least the wiping sheet and the screen in a direction parallel to the surface of the screen, and the screen cleaning control means is a plurality of types of screen cleaning patterns. Select one of them, and at least the ultrasonic vibration member, the cleaning agent supply device, the contact / separation device for the ultrasonic vibration member, the relative movement device for the ultrasonic vibration member, and the contact for the wiping sheet, etc.
6. The screen cleaning device according to claim 5, further comprising a wipe sheet control screen cleaning control unit that controls a separating device and a relative moving device such as a wipe sheet according to the selected screen cleaning pattern to clean the screen. 7. The screen cleaning control means sets a plurality of types of screen cleaning start conditions for starting cleaning of the screen, and a plurality of types of screen cleaning patterns set corresponding to the respective screen cleaning start conditions. When one of the storage means for storing and the screen cleaning start condition stored in the storage means is satisfied, the screen is displayed on the ultrasonic vibration member or the like according to the screen cleaning pattern set corresponding to the satisfied screen cleaning start condition. 7. The screen cleaning device according to claim 5, further comprising cleaning control means for cleaning when a screen cleaning start condition is satisfied. 8. A cleaning agent is supplied to a porous cleaning sheet disposed between a screen for a screen printing machine and an ultrasonic vibrating member, ultrasonically vibrates and is brought into contact with the screen to clean the screen. Screen cleaning method characterized by. 9. A screen cleaning device for cleaning a printing material contact surface of a screen printing machine, which is brought into contact with a printing material, wherein a strip-shaped wiping sheet has a part of the wiping sheet. A wiping sheet feeding device that holds the contact surface in a contactable manner and sends it in the longitudinal direction, a pressing device that presses a part of the wiping sheet against a part of the printing material contact surface, the screen and at least the pressing device. And a relative moving device such as a pressing device that relatively moves the device in a direction parallel to the feeding direction of the wiping sheet.