JPWO2020084695A1 - Cleaning system, cleaning method - Google Patents

Abstract

This is to reduce the load on the take-up motor that winds up the sheet in the cleaning system.
In the cleaning system according to the present disclosure, the moving direction of the cleaning device and the feeding direction of the sheet are opposite to each other. In this way, the direction of the frictional force acting between the mask and the cleaning device and the sheet feeding direction are the same, so compared to the case where the direction of these frictional forces and the sheet feeding direction are opposite. , It is possible to reduce the load of the take-up motor that winds up the sheet.

Description

The present disclosure relates to a cleaning system and a cleaning method for cleaning a screen mask of a screen printing machine.

Patent Document 1 describes a mask by winding a cleaning sheet (hereinafter, simply abbreviated as a sheet) and moving the cleaning device forward and backward along a screen mask (hereinafter, may be simply abbreviated as a mask). A cleaning system that removes residual solder is described in. In this cleaning system, it is possible to change the winding speed of the sheet depending on the section.

Japanese Unexamined Patent Publication No. 10-235843

Summary of disclosure

Issues that disclosure seeks to solve

The present disclosure is to reduce the load on the take-up motor that winds up the sheet in the cleaning system.

Solutions, actions and effects

In the cleaning system according to the present disclosure, the roll holding portion that holds the seat roll is not provided with an electric motor that rotationally drives the seat roll. Further, the moving direction of the cleaning device and the feeding direction of the sheet are opposite to each other. In this way, the direction of the frictional force acting between the mask and the sheet and the feeding direction of the sheet are the same, so compared to the case where the direction of the frictional force and the feeding direction of the sheet are opposite, the sheet It is possible to reduce the load on the take-up motor that takes up the air. In the cleaning system described in Patent Document 1, an electric motor for rotationally driving the seat roll is provided.

It is a side view which shows typically the mask printing machine which includes the cleaning system which concerns on this disclosure. It is a top view which shows the mask holding device of the said mask printing machine. It is a perspective view which shows the periphery of the cleaning apparatus of the said cleaning system. It is a top view of the said cleaning apparatus. It is a side view (partial cross section) which shows the said cleaning apparatus. It is a figure which shows the state which the cleaning head of the said cleaning apparatus was in contact with the lower surface of a mask. (7A), (7B) It is a figure which shows the state which the solder is transferred to a sheet by the said cleaning apparatus. (8A) to (8D) are views showing the operating state of the cleaning device. (9A) to (9D) are views showing another operating state of the cleaning device. It is a flowchart which shows the cleaning control program stored in the control device of the mask printing machine. (11A), (11B) It is a figure which shows the operating state of the conventional cleaning apparatus.

Hereinafter, the mask printing machine provided with the cleaning system according to the embodiment of the present disclosure will be described with reference to the drawings.

As schematically shown in FIG. 1, the mask printing machine includes a main body 10, a circuit board transfer device 12, a circuit board holding device 14, a mask holding device 16, a squeegee device 18, a cleaning device 20, a control device 22, and the like. ..
The circuit board transfer device 12 conveys the circuit board 30. In the present embodiment, the transport direction of the circuit board 30 is the x direction, the direction orthogonal to the transport direction in the horizontal plane is the y direction (the front-back direction of the mask printing machine), and the direction orthogonal to the x direction and the y direction is Let it be the z direction (vertical direction).

The circuit board holding device 14 holds the circuit board 30 and raises and lowers it. The circuit board holding device 14 brings the circuit board 30 close to and separated from the screen mask (hereinafter abbreviated as mask) 32 held by the mask holding device 16. In the present embodiment, the mask 32 is in the form of a sheet made of metal, for example, stainless steel, as shown in FIG. A plurality of openings 34 are formed in the mask 32.

The mask holding device 16 holds the mask 32 in the mask frame 36, adjusts the position of the mask 32, and holds the mask 32 in a horizontal posture.

As shown in FIG. 1, the squeegee device 18 applies solder to the mask 32 by moving the squeegee, and is a squeegee device main body 40, a pair of squeegee heads 42, a squeegee moving device 44, and a pair of squeegee elevating devices. Includes device 46. A squeegee 48 is held in each of the pair of squeegee heads 42. The squeegee moving device 44 moves a pair of squeegee heads 42 in the front-rear direction (y direction), and includes an electric motor 50 as a drive source, a motion conversion mechanism 51 including a pair of pulleys and a belt, and a pair of squeegee heads 42. Includes a slider 52 and the like for holding. The rotation of the electric motor 50 is converted into a linear movement of the slider 52 by the motion conversion mechanism 51. As a result, the pair of squeegees 48 are moved in the front-rear direction. The squeegee lifting device 46 raises and lowers the squeegee head 42, respectively. In the squeegee device 18, the squeegee 48 is moved in the front-rear direction by the squeegee moving device 44, and the creamy solder (hereinafter abbreviated as solder) 58 placed on the upper surface 56 of the mask 32 is printed on the substrate 30.

As shown in FIG. 1, the cleaning device 20 is located between a portion of the printing device main body 10 provided with the circuit board transfer device 12 and the circuit board holding device 14 and a portion provided with the mask holding device 16 and the squeegee device 18. It is provided in the part of. As shown in FIGS. 4 to 6, the cleaning device 20 is a device that cleans the lower surface 62 and the like of the mask 32 with a cleaning sheet 60 (hereinafter, abbreviated as sheet 60) which is a long cleaning sheet.

The cleaning device 20 is moved by the cleaning device moving device 68 as a moving device. As shown in FIG. 3, the cleaning device moving device 68 moves a pair of guides 69 extending in the front-rear direction (y direction), a slider 70 for holding the cleaning device 20, and a slider 70 in the front-rear direction (y direction). Includes a slider moving device 72. The slider moving device 72 includes an electric motor 74 as a drive source, and a motion conversion device 76 that converts the rotation of the electric motor 74 into linear movement and transmits it to the slider 70. The slider 70 is engaged with a pair of guides 69. The cleaning device 20 is moved in the front-rear direction by the cleaning device moving device 68. Further, the moving motor 74, which is an electric motor 74, can rotate in both forward and reverse directions, and the cleaning device 20 can change the moving direction.

The cleaning device 20 includes a main body 78, a roll holding unit 80, a winding unit 82, a cleaning head 84, a head elevating device 86, and the like. In the cleaning device 20, the roll holding portion 80, the cleaning head 84, and the winding portion 82 are located side by side in the front-rear direction.

The roll holding portion 80 includes a pair of roll holders 90 and 91 that are relatively rotatable and held by the main body 78, and a braking device 92 provided on the roll holder 90. A sheet roll 98 around which the sheet 60 is wound is held in the pair of roll holders 90 and 91. The brake device 92 suppresses the rotation of the seat roll 98 by suppressing the rotation of the roll holder 90. The brake device 92 brings the flange 94, the friction engaging member 96, and the friction engaging member 96, which are rotatably provided integrally with the roll holder 90, into contact with the outer peripheral surface of the flange 94. It includes an air cylinder 99 as a driving unit for moving the contact position to a separated position separated from the outer peripheral surface of the flange 94. By controlling the air supply state in the air cylinder 99, the friction engaging member 96 is moved between the contact position and the separation position. At the contact position of the friction engaging member 96, the rotation of the seat roll 98 is suppressed, and at the separation position, the rotation of the seat roll 98 is allowed. In the rotation restrained state, the pressing force of the friction engaging member 96 on the outer peripheral surface of the flange 94 can be controlled by controlling the air supply state in the air cylinder 99. In addition, the rotation restraint state also includes a rotation prevention state in which the rotation of the seat roll 98 is blocked. The drive unit 99 can also be a solenoid. Further, the roll holding portion 80 can also be referred to as a feeding portion for feeding (supplying) the cleaning sheet 60.

The take-up unit 82 includes a pair of rotary shafts 104 and 105 rotatably held by the main body 78, and an electric motor (which can be referred to as a take-up motor) 108 for driving the rotary shaft 104 to rotate. include. Rollers for winding (for example, a paper tube) 110 are attached to the rotating shafts 104 and 105. One end of the sheet 60 in the longitudinal direction is unwound from the sheet roll 98 and used for cleaning, and the used portion is wound around the roller 110.

The cleaning head 84 has a hollow cylindrical shape, and includes a suction hole 112 having an open upper surface. The suction hole 112 is connected to a suction device (for example, a vacuum pump) via a suction tube (not shown), and the solder is sucked by the vacuum pump and held on the sheet 60. Further, the cleaning head 84 can be raised and lowered by an air cylinder 86 which is a head raising and lowering device 86. By controlling the air supply state to the air cylinder 86, the cleaning head 84 has a separation position (see FIG. 5) in which the cleaning head 84 is separated from the lower surface 62 of the mask 32, and the cleaning head 84 is seated on the lower surface 62 of the mask 32. It is moved up and down to the contact position (see FIG. 6) that abuts via 60. When the mask 32 is cleaned, the cleaning head 84 is in the contact position.

The control device 22 is mainly a computer, and includes an execution unit, a storage unit, an input / output unit, and the like (not shown). Various sensors (not shown) are connected to the input / output section of the control device 22, and are not shown. A solenoid valve, a solenoid valve (not shown) connected to the head elevating device (air cylinder) 86 is connected, and the operating state of the air cylinders 99 and 86 is controlled by controlling the solenoid valve.

In the mask printing machine configured as described above, the solder 58 is printed on the substrate 30. The substrate 30 is carried into the mask printing machine by the circuit board transfer device 12, held by the circuit board holding device 14, raised, and brought into contact with the lower surface 62 of the mask 32. Then, one of the pair of squeegees 48 is lowered and brought into contact with the upper surface 56 of the mask 32, and is moved by the squeegee moving device 44. As a result, the solder 58 is moved along the upper surface 56, and the solder 58 is printed on the substrate 30 through the openings 34. After the printing is completed, the substrate 30 is lowered and separated from the mask 32, the holding by the circuit board holding device 14 is released, and the substrate 30 is carried out from the mask printing machine by the circuit board conveying device 12.

When printing is performed, the cleaning device 20 is in the retracted position shown in FIG. In the present embodiment, the retracted position is a position deviated from below the mask 32 of the mask printing machine. A sheet roll 98 is rotatably supported on the roll holding portion 80, and a roller 110 is attached to the winding portion 82.

When cleaning the mask 32, both pairs of squeegees 48 are separated from the mask 32. Then, as shown in FIG. 6, the cleaning head 84 is raised to the contact position, and the sheet 60 is brought into contact with the lower surface 62 of the mask 32. In that state, the cleaning device 20 is moved from the retracted position by the cleaning device moving device 68, the sheet 60 is moved along the lower surface 62 of the mask 32, and the solder remaining on the mask 32 is wiped off. Further, air is sucked by the suction device, and the solder remaining on the mask 32 at the cleaning head 84 is adhered to the upper surface of the sheet 60. In this embodiment, the sheet 60 may be wound up as the cleaning device 20 moves, or the sheet 60 may not be wound up.

When the mask 32 is cleaned, the cleaning program shown in the flowchart of FIG. 10 is executed.
In step 1 (hereinafter abbreviated as S1; the same applies to other steps), the solenoid valve connected to the air cylinder 99 of the brake device 92 is controlled, and in S2, the take-up motor 108 is controlled. In S3, the moving motor 74 is controlled.

For example, in the brake device 92, when the friction engaging member 96 is positioned at the contact position and the take-up motor 108 is stopped by the control of the air cylinder 99, the seat 60 is taken up. There is no. When the friction engaging member 96 is pressed against the outer peripheral surface of the flange 94, the rotation of the seat roll 98 is suppressed, so that the rotation is suppressed. As a result, the rotation of the sheet roll 98 is prevented, so that the sheet 60 can be satisfactorily prevented from being pulled out due to the frictional force, and the slack of the sheet 60 due to the movement of the cleaning device 20 can be prevented. Can be done.

Further, in the brake device 92, when the friction engaging member 96 is positioned at a separated position by the control of the air cylinder 99 to allow rotation and the take-up motor 108 is operated, the seat 60 Is taken up. For example, when the moving direction of the cleaning device 20 and the feeding direction of the sheet 60 are opposite to each other, the direction of the frictional force between the sheet 60 and the mask 32 and the feeding direction of the sheet 60 are the same. In this case, the seat 60 can be wound so as not to sag by controlling the rotation speed, torque, etc. of the winding motor 108. Further, when the sheet 60 is pulled out from the sheet roll 98 and wound up by the frictional force between the mask 32 and the sheet 60, it is considered that the feed of the sheet 60 and the movement of the cleaning head 84 are substantially synchronized. .. In other words, it is considered that the winding speed of the sheet 60 and the moving speed of the cleaning device 20 substantially correspond to each other.

A case where the sheet 60 is wound up with the movement of the cleaning device 20 will be described with reference to FIG. 7. Since the winding unit 82 is located behind the roll holding unit 80 in the moving direction of the cleaning device 20, the moving direction of the cleaning device 20 and the feeding direction of the sheet 60 are opposite to each other as shown in FIG. 7A. In other words, the direction of the frictional force acting between the sheet 60 and the mask 32 and the direction of feeding of the sheet 60 are the same. Therefore, the load applied to the take-up motor 108 can be reduced as compared with the case where the feed direction of the seat 60 and the frictional force are opposite to each other. Further, since the sheet 60 is pulled out from the sheet roll 98 by the frictional force, the sheet 60 can be pulled out as the cleaning device 20 moves.

On the other hand, as shown in FIGS. 11A and 11B, when the moving direction of the cleaning device 20a and the feeding direction of the sheet 60 are the same, the opening of the mask 32 with respect to the opening size of the suction hole 112a of the cleaning head 84a. When the 34 is small, even if the solder is held on the sheet 60 by the cleaning head 84a, the sheet 60 also moves toward the wall portion 34h as the opening 34 of the cleaning head 84a moves toward the wall portion 34h. , The solder held on the sheet 60 will be attracted to the wall portion 34h, and it may be difficult to remove the solder from the opening 34.

On the other hand, in this embodiment, the cleaning head 84 is moved toward the wall portion 34h, while the seat 60 is moved away from the wall portion 34h. Further, the sheet 60 is fed as the cleaning head 84 moves. Therefore, as shown in FIG. 7B, the solder held in the sheet 60 can be satisfactorily removed from the opening 34.

Based on FIG. 8, a case where the sheet 60 is wound or is not wound when the cleaning head 84 is moved will be described. In this embodiment, the winding unit 82 is located behind the roll holding unit 80 in the moving direction of the cleaning device 20.
Even if the cleaning device 20 is moved from the retracted position to the position shown in FIG. 8A, the cleaning sheet 60 is not wound up. The cleaning device 20 moves to the portion of the mask 32 where the opening 34 is not formed, the portion where the opening 34 is formed but the density is low, that is, the portion where high printing accuracy is not required, without the sheet 60 being wound up. Be made to. In this case, since the brake device 92 prevents the seat roll 98 from rotating, it is possible to satisfactorily prevent the seat 60 from being pulled out by the frictional force.

Then, the sheet 60 is wound up in a portion where the opening 34 is small, the density is high (the pattern is fine), and high printing accuracy is required, such as between the position shown in FIG. 8A and the position shown in FIG. 8B. The cleaning device 20 is moved while being moved. Since the feeding direction of the sheet 60 and the moving direction of the cleaning device 20 are opposite to each other, the solder located inside the opening 34 of the mask 32 and the solder adhering to the lower surface 62 can be satisfactorily removed.
After that, as shown in FIG. 8C, the cleaning device 20 is moved without the sheet 60 being wound up. In this way, since the sheet 60 is wound only when necessary, it is possible to reduce the consumption of the sheet 60.

A case where the moving direction of the cleaning device 20 is changed during cleaning will be described with reference to FIG.
For example, the cleaning device 20 is moved from the position shown in FIG. 9A to the position shown in FIG. 9B without winding the sheet 60. Cleaning is performed using the same portion of the sheet 60. In the cleaning device 20, the winding unit 82 is moved from the roll holding unit 80 in a direction in which the cleaning device 20 is located on the front side in the moving direction of the cleaning device 20.
When the position shown in FIG. 9B is reached, as shown in FIG. 9C, the cleaning device 20 is oriented in the opposite direction while the sheet 60 is being wound, that is, the winding unit 82 is behind the roll holding unit 80 in the moving direction of the cleaning device 20. It can be moved in the direction that is located on the side. In the previous step (movement from the position shown in FIG. 9A to the position shown in FIG. 9B), the portion of the used sheet 60 is wound up, and the portion of the new sheet 60 is brought into contact with the lower surface 62 of the mask 32. .. Further, when the sheet 60 is wound, the moving direction of the cleaning device 20 and the feeding direction of the sheet 60 are opposite to each other. Therefore, the wall portion in the opening 34 in the previous process while reducing the load applied to the winding motor 108. The solder attracted to 34h can be satisfactorily removed.
After that, as shown in FIG. 9D, the cleaning device 20 is moved in the opposite direction without the sheet 60 being wound up. The winding unit 82 is located on the front side of the roll holding unit 80 in the moving direction of the cleaning device 20. In this case, the new portion of the sheet 60 comes into contact with the lower surface 62 of the mask 32.

It is not essential to move the cleaning device 20 from the position shown in FIG. 9B to the position shown in FIG. 9D, from the position shown in FIG. 9B to the position intermediate between the position shown in FIG. 9B and the position shown in FIG. 9D. You can also move it. Further, the cleaning device 20 can be moved from the position shown in FIG. 9D to the position shown in FIG. 9B in a state where the cleaning head 84 is lowered to a separated position where the sheet 60 is separated from the mask 32. This is because the need to clean the section between the position shown in FIG. 9B and the position shown in FIG. 9D three times is low.

As described above, in the present embodiment, the cleaning system is configured by the cleaning device 20, the cleaning device moving device 68, the portion that stores the cleaning program of the control device 22, the portion that executes the cleaning program, and the like. Further, in the cleaning system, the brake control unit is composed of the part that stores S1 and the part that executes it, and the part that stores S2 and the part that executes S2 are used for the first winding motor control unit and the second winding. The motor control unit is configured, and the movement control unit is composed of a portion that stores S3, a portion that executes S3, and the like.
Further, the execution shown in FIGS. 7A and 7B, the execution between the position shown in FIG. 8A and the position shown in FIG. 8B, and the execution between the position shown in FIG. 9B and the position shown in FIG. 9C correspond to the first cleaning step. , Between the retracted position and the position shown in FIG. 8A, between the position shown in FIG. 8B and the position shown in FIG. 8C, between the position shown in FIG. 9A and the position shown in FIG. The execution with and from the position shown in 9D corresponds to the second cleaning step. Further, the execution between the position shown in FIG. 9A and the position shown in FIG. 9B, and the execution between the position shown in FIG. 9C and the position shown in FIG. 9D corresponds to the first moving step, and the position shown in FIG. 9B and FIG. 9C The execution with and from the position shown in is corresponding to the second moving step.

In the above embodiment, when the moving direction of the cleaning device 20 and the feeding direction of the sheet 60 are opposite to each other, the friction engaging member is applied from the outer peripheral surface of the flange 94 in a state where the sheet roll 98 is allowed to rotate. Although the 96s were separated from each other, the friction engaging member 96 may be in sliding contact with the outer peripheral surface of the flange 94. Cleaning while the seat 60 is wound by the winding unit 82 in a state where the rotation of the seat roll 98 is slightly suppressed by controlling the pressing force of the friction engaging member 96 against the flange 94 by controlling the air of the air cylinder 99. The device 20 can be moved. The load applied to the take-up motor 108 is larger than that in the above embodiment, but the take-up motor 108 can be easily controlled.

Further, the take-up motor 108 is controlled so that the feed of the sheet 60 and the movement of the cleaning device 20 are synchronized, in other words, the sheet 60 is fed with the movement of the cleaning device 20. be able to.

In addition to the above examples, the present disclosure can be carried out in various forms with various changes and improvements based on the knowledge of those skilled in the art.

20: Cleaning device 22: Control device 32: Mask 34: Opening 60: Sheet 68: Cleaning device Moving device 74: Electric motor 72: Feed screw 80: Feeding part 82: Winding part 84: Cleaning head 92: Rotation suppression device 94 : Flange 96: Friction engaging member 98: Sheet roll 108: Winding motor 110: Winding roll 112: Suction hole

Claims (8)

A cleaning device that presses the cleaning sheet against the screen mask by a cleaning head while feeding the cleaning sheet, and a moving device that moves the cleaning device along the screen mask are included, and the screen mask is used with the cleaning sheet. It is a cleaning system that cleans
The cleaning device includes a roll holding portion for holding a sheet roll in which the cleaning sheet is rolled into a roll, and a winding portion for winding a used cleaning sheet drawn out from the sheet roll and used.
The roll holding unit does not include an electric motor that rotationally drives the sheet roll, and the winding unit includes a winding motor that is an electric motor that rotationally drives a roller that winds up the used cleaning sheet.
A cleaning system including a movement control unit in which the cleaning system controls the moving device to move the cleaning device in a direction opposite to the feeding direction of the cleaning sheet. A cleaning system that cleans screen masks
(a) A roll holding portion that holds a sheet roll in which a long cleaning sheet is rolled into a roll, and (b) a cream-like solder remaining on the screen mask adheres to the cleaning sheet drawn from the sheet roll. A cleaning device including a cleaning head for winding the used cleaning sheet, and (c) a winding portion for winding the used cleaning sheet drawn from the sheet roll by an electric motor for winding.
The cleaning device includes a moving device that moves the cleaning device along the screen mask.
The roll holding portion does not include an electric motor that rotationally drives the seat roll, but includes a brake device that suppresses the rotation of the roll holder that rotatably holds the seat roll with respect to the screen device main body.
Cleaning including a brake control unit in which the cleaning system switches the rotation of the roll holder between a restrained rotation state and a permitted rotation state by controlling the brake device during the cleaning operation of the screen mask. system. The cleaning according to claim 1 or 2, wherein the cleaning system includes a first winding motor control unit that winds up the cleaning sheet drawn from the sheet roll without loosening by controlling the winding motor. system. Any one of claims 1 to 3, wherein the cleaning system includes a second take-up motor control unit that controls the take-up motor so that the cleaning sheet is sent as the cleaning device moves. The cleaning system described in. This is a cleaning method in which the cleaning sheet is used to clean the screen mask by moving the cleaning device that presses the cleaning sheet against the screen mask by the cleaning head while feeding the cleaning sheet along the screen mask. hand,
The cleaning device includes a roll holding portion that holds a sheet roll in which the cleaning sheet is rolled into a roll shape, and a winding portion that winds up the used cleaning sheet that has been pulled out from the sheet roll and used. ,
The roll holding unit does not include an electric motor that rotationally drives the sheet roll, but the winding unit includes a winding motor that is an electric motor that rotationally drives a roller that winds up the used cleaning sheet. ,
A cleaning method characterized in that the cleaning device is moved in a direction opposite to the feeding direction of the cleaning sheet. A cleaning method in which a cleaning device that presses a cleaning sheet against a screen mask by a cleaning head is moved along the screen mask to clean the screen mask using the cleaning sheet.
The cleaning device holds a seat roll around which the cleaning sheet is wound, and does not include an electric motor that rotationally drives the seat roll, but includes a roll holding portion provided with a brake device that suppresses the rotation of the seat roll. A winding portion for winding the used cleaning sheet drawn from the sheet roll and used by a winding motor which is an electric motor is included.
The first cleaning step of moving the cleaning device while winding the used cleaning sheet by the winding motor while allowing the rotation of the sheet roll.
A cleaning method including a second cleaning step of moving the cleaning device without winding the used cleaning sheet by the winding motor while the rotation of the seat roll is suppressed by the brake device. A roll holder for holding a sheet roll on which a long cleaning sheet is wound, a cleaning head for pressing the cleaning sheet pulled out from the sheet roll against a screen mask, and a used used sheet pulled out from the sheet roll. A cleaning method for cleaning the screen mask by moving a cleaning device including a winding portion for winding the cleaning sheet along the screen mask.
During the cleaning of the screen mask, the first moving step of moving the cleaning device in the direction in which the winding portion is located on the front side in the moving direction from the roll holding portion.
After the first moving step, the cleaning sheet is wound by the winding portion, and the cleaning device is moved in a direction in which the winding portion is located behind the roll holding portion in the moving direction. Cleaning method including steps. The first moving step is performed without the rotation of the sheet roll held by the roll holding portion being suppressed and the used cleaning sheet being wound by the winding portion.
The cleaning method according to claim 7, wherein the second moving step is performed while the used cleaning sheet is being wound up by the winding unit while the sheet roll held by the roll holding unit is allowed to rotate.

Images