WO2015128929A1 - スクリーン印刷機 - Google Patents
スクリーン印刷機 Download PDFInfo
- Publication number
- WO2015128929A1 WO2015128929A1 PCT/JP2014/054448 JP2014054448W WO2015128929A1 WO 2015128929 A1 WO2015128929 A1 WO 2015128929A1 JP 2014054448 W JP2014054448 W JP 2014054448W WO 2015128929 A1 WO2015128929 A1 WO 2015128929A1
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- WIPO (PCT)
- Prior art keywords
- squeegee
- screen
- pressure
- air
- cylinder
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/44—Squeegees or doctors
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
- H05K3/1233—Methods or means for supplying the conductive material and for forcing it through the screen or stencil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/08—Machines
- B41F15/0881—Machines for printing on polyhedral articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/40—Inking units
- B41F15/42—Inking units comprising squeegees or doctors
- B41F15/423—Driving means for reciprocating squeegees
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2215/00—Screen printing machines
- B41P2215/10—Screen printing machines characterised by their constructional features
- B41P2215/13—Devices for increasing ink penetration
- B41P2215/132—Devices for increasing ink penetration by increasing pressure above the screen
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3457—Solder materials or compositions; Methods of application thereof
- H05K3/3485—Applying solder paste, slurry or powder
Definitions
- the present invention relates to a screen printer that presses a squeegee against a screen, and relates to control of a pressing force that presses the squeegee.
- the screen printing machine disclosed in Patent Document 1 is provided with a load sensor for detecting a load applied to the squeegee.
- the squeegee is subjected to a biasing force of the compression coil spring as a load.
- the screen printing machine is equipped with an air cylinder that acts on the squeegee in a direction against the urging force of the compression coil spring, and controls the pressure of the air cylinder based on the output value of the load sensor to adjust the pressing force. I am trying.
- the load sensor accurately detects the load applied to the squeegee without affecting the movement of the squeegee so that the total weight of the members moving integrally with the squeegee and the urging force of the compression coil spring can be detected. It needs to be provided at a position where it works properly. For this reason, in the above-described screen printing machine, since a dedicated sensor is provided, the structure of the frame for holding the squeegee is complicated, which may increase the manufacturing cost.
- the present invention has been made in view of the above-described problems, and the screen printing capable of accurately adjusting the pressing force for pressing the squeegee against the screen with a simple configuration and thus reducing the manufacturing cost.
- the purpose is to provide a machine.
- a screen printing machine made in view of the above problems, a screen having a plurality of through holes, sliding on the screen, and printing a printing material on an object from the through holes of the screen.
- a unit for the squeegee, a fluid pressure cylinder that urges the squeegee toward or away from the screen according to the internal pressure of the cylinder housing, a pressure sensor that detects the internal pressure of the cylinder housing, and a unit for the fluid pressure cylinder A control unit that controls the internal pressure based on the response time from the start of control for changing the internal pressure by supplying or discharging a fluid at a predetermined flow rate per time until the detected value of the pressure sensor reaches the target value. And.
- FIG. 1 is a front view of a cream solder printer 100 according to the present embodiment.
- a cream solder printer 100 (hereinafter simply referred to as “printer”) is an apparatus that prints cream solder (not shown) on a screen 10 (see FIG. 2) onto a printed circuit board 20 using a squeegee 120. is there.
- the direction in which the squeegee 120 moves is the Y-axis direction (left-right direction in FIG. 2), and the direction parallel to the horizontal plane of the screen 10 and perpendicular to the Y-axis direction is 2) and will be described.
- FIG. 2 is a side view of the printing press 100.
- the screen 10 shown in FIG. 2 has a plurality of through holes (not shown) penetrating in the thickness direction (vertical direction in FIG. 2), and the periphery of the screen 10 is fixed to a screen frame (not shown).
- the screen frame is placed on a screen support base whose position is fixed, the positions in the X-axis direction and the Y-axis direction are determined by a positioning device, and are fixed to the screen support base by a fixing device.
- the printing machine 100 conveys the printed circuit board 20 along the X-axis direction to the lower side of the screen 10 by the substrate conveyor, and then lifts and lowers the printed circuit board 20 by the lifting device so as to contact or separate from the screen 10.
- the printed circuit board 20 is brought into contact with the lower surface of the screen 10 at the time of printing cream solder. After the cream solder is printed, the printed board 20 is carried out by a board conveyor. In FIG. 2, the screen 10 and the printed circuit board 20 are shown closer to the squeegee 120 than in practice for the sake of illustration.
- the printing press 100 has a squeegee moving device (not shown).
- the squeegee moving device has a Y-axis slide (not shown) held so as to be movable in the Y-axis direction, and drives the servo motor 34 (see FIG. 4) to move the Y-axis slide in the Y-axis direction.
- a frame 38 is provided on the Y-axis slide.
- Two sets of squeegee units 40 are attached to the frame 38.
- the frame 38 is moved in the Y-axis direction together with the Y-axis slide by the squeegee moving device.
- the two sets of squeegee units 40 are provided at symmetrical positions in the Y-axis direction and have the same configuration. In the following description, one squeegee unit 40 will be representatively described.
- the frame 38 is provided with a squeegee elevating air cylinder 42 facing downward.
- the cylinder housing 44 of the squeegee elevating air cylinder 42 is fixed to the frame 38.
- the piston rod 46 of the air cylinder 42 for raising and lowering the squeegee protrudes downward from the cylinder housing 44 and is inserted into a through hole 48 formed in the frame 38.
- a pressing force adjusting air cylinder 56 is provided between the cylinder housings 44 provided in each of the two sets of squeegee units 40 in the Y-axis direction.
- the cylinder housing 64 of the pressing force adjusting air cylinder 56 has a first air chamber 72 formed on the upper side of the piston 62 and a second air chamber 74 formed on the lower side.
- the piston rod 58 of the piston 62 protrudes downward from the inside of the cylinder housing 64, and the tip is fixed to the frame 38.
- the portion of the piston 62 that slides with the cylinder housing 64 is not provided with a seal member. Instead, the clearance to be fitted is made smaller than usual, so that substantially airtightness is maintained. It has become.
- Two annular relief grooves 76 are formed on the outer peripheral surface of the piston 62.
- two annular relief grooves 78 are formed in the insertion hole of the cylinder housing 64 through which the piston rod 58 is inserted. As a result, the piston 62 slides smoothly even if the clearance with the cylinder housing 64 is small.
- a compression coil spring 86 is disposed between the frame 38 and the cylinder housing 64 in the vertical direction, and urges the frame 38 downward.
- the piston rod 46 of the air cylinder 42 for raising and lowering the squeegee inserted into the through hole 48 provided in the frame 38 has a tip connected to the support member 102.
- a linear movement member 104 is fixed to the lower surface of the support member 102.
- the support shaft 106 is held by the linear moving member 104.
- the rotation member 108 is held by a support shaft 106 along the Y-axis direction so as to be rotatable about the support shaft 106.
- a squeegee holding member 118 of the print head 116 is attached to the lower surface of the rotating member 108.
- the squeegee 120 is attached to the squeegee holding member 118.
- the print head 116 can be rotated together with the rotation member 108 and is moved up and down by the squeegee lifting air cylinder 42 and the pressing force adjusting air cylinder 56.
- a pair of linear guide rods 124 are provided on the upper surface of the linear moving member 104 at positions separated in the X-axis direction. These guide rods 124 are fitted to two guide cylinders 126 provided on the frame 38 in the vertical direction so as to be slidable in the axial direction, and the linear moving member 104, the rotating member 108 and the squeegee 120 are moved up and down. Guide the direction to go.
- the squeegee holding member 118 has a substantially rectangular plate shape and is arranged so that the direction orthogonal to the main surface is the Y-axis direction, and the squeegee 120 is detachable.
- the squeegee 120 is made of, for example, rubber or metal (for example, stainless steel) and is formed in a substantially rectangular plate shape.
- the squeegee 120 is held by a squeegee holding member 118 so that the main surface faces the Y-axis direction.
- the squeegee 120 is held by the squeegee holding member 118 in a state inclined with respect to the horizontal plane of the screen 10 (see FIG. 2).
- air is supplied from the air regulator 96 to the second air chamber 74 of the cylinder housing 64 through the opening 64 ⁇ / b> A of the cylinder housing 64.
- the piston 62 of the cylinder housing 64 moves up and down according to the internal pressure of the second air chamber 74.
- the air regulator 96 is connected between the air source 98 and the second air chamber 74.
- the air regulator 96 adjusts the pressure of air having a predetermined value supplied from the air source 98 based on the control of the control unit 148 and then supplies the air to the second air chamber 74.
- the second air chamber 74 is supplied with air according to the pressure of the air supplied from the air regulator 96, or the air is discharged and the internal pressure is changed.
- a pressure sensor 114 that detects the internal pressure of the second air chamber 74 is provided between the air regulator 96 and the cylinder housing 64. The pressure sensor 114 outputs the detection result to the control unit 148.
- FIG. 3 shows a state in which printing is not performed, which is the rising end position.
- the control unit 148 controls the air regulator 96 to supply air having a pressure higher than the atmospheric pressure to the second air chamber 74, and raises the squeegee 120 to the rising end position in FIG.
- the control unit 148 has a PU 140 that is a processing circuit, a ROM 142 that stores a control program, a RAM 144 that is a working memory, and a bus 146 that connects them.
- An input interface 150 is connected to the bus 146 and the value of the internal pressure of the second air chamber 74 detected by the pressure sensor 114 is input.
- a plurality of drive circuits 156 to 158 are connected to the bus 146 via the output interface 154.
- the control unit 148 controls the servo motor 34 via the drive circuit 156. Further, the control unit 148 controls the air regulator 94 that adjusts the pressure of the air supplied to each of the squeegee lifting air cylinders 42 via the drive circuit 157. Further, the control unit 148 controls the air regulator 96 described above via the drive circuit 158.
- the printing press 100 of this embodiment performs printing alternately by the two sets of squeegee units 40.
- the control unit 148 controls the squeegee moving device (servo motor 34) to move the two sets of squeegee units 40 from one side to the other side in the Y-axis direction.
- the control unit 148 lowers the squeegee 120 of the squeegee unit 40 located on the upstream side in the moving direction and brings it into contact with the screen 10 with a desired pressing force.
- the squeegee unit 40 is moved along the screen 10 and prints on the printed circuit board 20 through the through holes provided in the screen 10 while scraping the cream solder placed on the screen 10 with the squeegee 120.
- the squeegee unit 40 located on the downstream side makes the piston rod 46 of the air cylinder 42 for raising and lowering the squeegee and the cylinder housing 64 of the air cylinder 56 for adjusting the pressing force as the rising end positions, and makes the squeegee 120 contact the screen 10. Do not let it.
- the printing press 100 carries out the printed board 20 after printing and carries in the next printed board 20. Then, the printing press 100 raises the squeegee 120 used in the previous printing, lowers the squeegee 120 not used in the previous printing, and swaps the positions of the squeegee units 40. Print while moving to.
- FIG. 5 is a schematic diagram showing a state before the squeegee 120 contacts the screen 10.
- the controller 148 first drives the air regulator 94 corresponding to the squeegee lifting air cylinder 42 (see FIG. 1) via the drive circuit 157 to lower the squeegee 120.
- the squeegee lifting air cylinder 42 lowers the squeegee 120 to a position slightly above the screen 10 (for example, a position 3 mm above the screen 10).
- the control unit 148 lowers the squeegee 120 by the pressing force adjusting air cylinder 56.
- the air cylinder 56 for adjusting the pressing force applies a force in a direction against the urging force of the compression coil spring 86 from the piston rod 58 to the frame 38.
- the force exerted on the frame 38 by the pressing force adjusting air cylinder 56 acts on the squeegee 120 via the squeegee elevating air cylinder 42, the linear moving member 104, the squeegee holding member 118, and the like.
- the force exerted on the squeegee 120 by the pressing force adjusting air cylinder 56 decreases as the internal pressure of the second air chamber 74 decreases.
- FC FA + W-FB
- FA in the above formula (1) is a downward biasing force by the compression coil spring 86.
- W denotes various members (the frame 38, the squeegee lifting / lowering air cylinder 42, the supporting member 102, the linear moving member 104, the rotating member 108, the supporting shaft 106, the squeegee holding member 118, This is the total weight of the squeegee 120).
- FB is an upward force that resists the biasing force of the compression coil spring 86 that the pressing force adjusting air cylinder 56 acts on the squeegee 120.
- the control unit 148 controls the air regulator 96 to reduce the internal pressure of the second air chamber 74. As the second air chamber 74 is depressurized, the force FB decreases, and the squeegee 120 is lowered by the force FA of the compression coil spring 86. The squeegee 120 stops at a position where the upward force and the downward force are balanced (the force FC becomes zero).
- the control unit 148 designates the time from the start of the pressure reduction instruction to the air regulator 96 until the detection value of the pressure sensor 114 reaches the target value as the “response time”, and based on the response time. A state in which the squeegee 120 contacts the screen 10 or the squeegee 120 is separated from the screen 10 is detected.
- force FA of the above formula (1) is expressed by the following formula.
- FA k ⁇ L (2)
- K in the above equation (2) is a spring constant of the compression coil spring 86.
- L is the length of the compression coil spring 86 along the vertical direction.
- force FB of the said Formula (1) is represented by following Formula.
- FB S ⁇ P (3)
- S in the above formula (3) is a sectional area of the cylinder housing 64 (surface area when the piston 62 in the cylinder housing 64 is viewed from one side in the vertical direction).
- P is the internal pressure of the second air chamber 74.
- the volume of the second air chamber 74 is reduced by the amount by which the piston 62 is lowered.
- the change amount ⁇ V1 of the volume of the second air chamber 74 is expressed by the following equation using the above equation (6).
- the cylinder housing 64 is formed with an opening 64A (see FIG. 3) having a predetermined size to which the air regulator 96 and the second air chamber 74 are connected. For this reason, as the internal pressure P changes, the second air chamber 74 is supplied or discharged with air at a predetermined flow rate from the opening 64A per unit time.
- the flow rate per unit time of the air flowing through the opening 64A is Q
- the control unit 148 instructs the air regulator 96 to depressurize from the pressure P1 to the pressure P2
- the detected value of the pressure sensor 114 becomes the target value (pressure Response time RT1 until reaching P2) is expressed by the following equation using equation (7).
- the position of the squeegee 120 does not change.
- the pressure of the second air chamber 74 is changed with the volume kept constant. That is, the state change of the second air chamber 74 is different before and after the squeegee 120 contacts the screen 10.
- the air corresponding to the change amount ⁇ V2 expressed by the following equation is discharged from the second air chamber 74 until the internal pressure is changed from the pressure P3 to the pressure P4 by the air regulator 96. .
- V3 in the above formula (9) is the volume of the second air chamber 74 when the squeegee 120 is in contact with the screen 10.
- the response time RT2 from when the control unit 148 instructs the air regulator 96 to reduce the pressure P3 to the pressure P4 until the detected value of the pressure sensor 114 reaches the target value (pressure P4) is Is expressed by the following equation using the above equation (9).
- FC a force corresponding to the pressure reduction (reduction of the force FB) of the second air chamber 74.
- the response time RT1 before the squeegee 120 contacts the screen 10 is different from the response time RT2 after the contact.
- the change amount ⁇ V1 changes compared to the change amount ⁇ V2 because the vertical position of the cylinder housing 64 (squeegee 120) fluctuates and the volume of the second air chamber 74 changes greatly. The amount increases. For this reason, the response times RT1 and RT2 correlated with the change amounts ⁇ V1 and ⁇ V2 are faster than the response time RT1.
- the control unit 148 of the present embodiment measures the response time while reducing the internal pressure P of the second air chamber 74 and detects that the response time RT1 has changed to the response time RT2, the squeegee 120 detects that the screen 10 It is determined that it is in a state of touching.
- the control unit 148 detects the contact of the squeegee 120 with the screen 10
- the control unit 148 controls the internal pressure P based on the set pressure at the time of detection, and sets the pressing force to press the squeegee 120 against the screen 10 to a desired magnitude. change.
- the graph in FIG. 7 shows the relationship between the control pressure PX of the air regulator 96 and the response times RT1, RT2.
- the vertical axis indicates the control pressure PX at which the control unit 148 controls the air regulator 96.
- the horizontal axis indicates time.
- control for reducing the pressure of the second air chamber 74 is started from time T1, and the squeegee 120 contacts the screen 10 at time T4.
- the internal pressure P is 1 MPa (megapascals) in the state of time T1 when pressure reduction is started.
- control unit 148 changes the control pressure PX for the air regulator 96 so that the pressure is reduced or increased by 0.1 MPa every 60 seconds (S).
- control unit 148 determines the response times RT1 and RT2 every 60 seconds.
- the control period of 60 seconds is, for example, a time sufficient for the air regulator 96 to depressurize or pressurize the second air chamber 74 by 0.1 MPa, that is, a time sufficiently longer than the response times RT1 and RT2. Is set.
- the control unit 148 starts control to reduce the control pressure PX, that is, the internal pressure P of the second air chamber 74 from 1 MPa to 0.9 MPa with respect to the air regulator 96 at time T1.
- the control pressure PX that is, the internal pressure P of the second air chamber 74 from 1 MPa to 0.9 MPa with respect to the air regulator 96 at time T1.
- the detection value of the pressure sensor 114 reaches 0.9 MPa, and the detection result is the control unit. 148 is input.
- the control unit 148 determines the response time at time T2 after 60 seconds from time T1.
- the control unit 148 determines that the response time is the response time RT1.
- the control unit 148 reduces the control pressure PX by 0.1 MPa every 60 seconds.
- the control unit 148 starts control to reduce the control pressure PX from 0.7 MPa to 0.6 MPa at time T3.
- the squeegee 120 contacts the screen 10.
- the control unit 148 detects that the response time has changed from the response time RT1 to the response time RT2, and the squeegee 120 contacts the screen 10. judge. Strictly speaking, the squeegee 120 is not in contact with the screen 10 from time T3 to time T4, and the squeegee 120 is in contact with the screen 10 from time T4 to time T5.
- the response time RT2 measured between the time T3 and the time T5 is compared with the response time RT2 measured after the time T5 by the amount including the period in which the squeegee 120 is separated from the screen 10. growing.
- the control unit 148 determines that the state has changed to the state of the response time RT2 (the squeegee 120 contacts the screen 10). It becomes possible to respond.
- control unit 148 performs control to further reduce the control pressure PX on the basis of the control pressure PX at which the contact of the squeegee 120 to the screen 10 is detected, in this case, 0.6 MPa.
- the size of the controller 148 has a preset pressure reduction range indicating how much pressure is further reduced from the control pressure PX that has detected contact.
- the control unit 148 further reduces the pressure by 0.3 MPa from the control pressure PX (0.6 MPa) at which contact is detected.
- the control unit 148 reduces the control pressure PX to a pressure (0.3 MPa in this case) reduced by 0.3 MPa with respect to 0.6 MPa.
- the control unit 148 starts the printing operation at time T6 when the control pressure PX becomes 0.3 MPa.
- the printing press 100 is in a state in which the squeegee 120 is pressed against the screen 10 with a desired pressing force, and printing can be suitably performed.
- control unit 148 can detect the contact between the squeegee 120 and the screen 10 from the change in the response times RT1 and RT2 in the pressurization control, similarly to the control for reducing the control pressure PX.
- the squeegee 120 is separated from the screen 10 at time T7.
- the control unit 148 performs control based on the control pressure PX whose response time has changed from the response time RT2 to the response time RT1. It becomes possible to do.
- the response times RT1 and RT2 may differ depending on whether the control pressure PX is reduced or increased. This is because, for example, when the squeegee 120 that has once contacted the screen 10 is separated, the cream solder on the screen 10 adheres to the force corresponding to the viscosity of the cream solder (the direction in which the squeegee 120 is separated from the screen 10). The response times RT1 and RT2 are different between contact and separation due to the action of the direction force. Alternatively, in the pressing force adjusting air cylinder 56, the frictional resistance generated when the piston 62 and the cylinder housing 64 slide may be different depending on whether the piston 62 is raised or lowered.
- the control unit 148 uses the response times RT1 and RT2 optimized for the case where the squeegee 120 is raised and the case where the squeegee 120 is lowered, so that the squeegee 120 and the screen 10 are in contact with and separated from each other. It becomes possible to detect the control pressure PX more accurately.
- the response time RT2 after the squeegee 120 contacts the screen 10 is earlier than the response time RT1 before the contact. For this reason, when the control unit 148 measures the response time while reducing the internal pressure P of the second air chamber 74 and detects that the response time has changed from the response time RT1 to the response time RT2, the squeegee 120 detects that the screen 10 It is determined that it is in a state of touching. If the control is performed based on the internal pressure P (control pressure PX of the air regulator 96) that detects the response times RT1 and RT2, the pressing force for pressing the squeegee 120 against the screen 10 can be adjusted.
- control pressure PX of the air regulator 96 control pressure PX of the air regulator 96
- the pressure sensor 114 is provided not only in the pressing force adjusting air cylinder 56 but also in an air cylinder that changes the position of the movable portion. Therefore, according to the printing press 100, it is not necessary to separately provide a dedicated sensor (such as a load sensor) for detecting the pressing force of the squeegee 120 by using the existing pressure sensor 114.
- a dedicated sensor such as a load sensor
- the load sensor when the load sensor is provided on the squeegee holding member 118 or the like as in the prior art, it is necessary to provide the load sensor at an appropriate position in order to accurately measure the load applied to the squeegee 120.
- the structure may be complicated.
- the pressing force of the squeegee 120 can be accurately adjusted with a simple configuration, and as a result, the manufacturing cost can be reduced.
- the control unit 148 measures response times RT1 and RT2 required to reduce or increase the control pressure PX of the air regulator 96 by 0.1 MPa. Further, the control unit 148 detects whether the squeegee 120 and the screen 10 are in contact with or separated from each other based on the measured changes in the response times RT1 and RT2. When the control unit 148 detects contact of the squeegee 120 with the screen 10, the control pressure PX at the time of detection is used as a reference, and the control pressure PX is further controlled so that the pressing force of the squeegee 120 has a desired magnitude. It is possible to change to.
- an air regulator 96 that adjusts the pressure of air supplied from the air source 98 is provided between the air source 98 and the cylinder housing 64.
- the control unit 148 can adjust the internal pressure P of the second air chamber 74 of the cylinder housing 64 with high accuracy by controlling the control pressure PX of the air regulator 96.
- the printing press 100 is provided with a compression coil spring 86 that urges the squeegee 120 in a direction (downward in FIG. 5) against the urging force of the air cylinder 56 for adjusting the pressing force.
- the pressing force of the squeegee 120 can be changed by adjusting the urging force by the pressing force adjusting air cylinder 56 and the urging force by the compression coil spring 86.
- the squeegee 120 In addition to the total weight of various members (such as the linearly moving member 104) that move integrally with the squeegee 120, the squeegee 120 is subjected to the urging force of the compression coil spring 86. Therefore, in such a configuration, even when the appropriate pressing force of the squeegee 120 is larger than the total weight of the members moving integrally with the squeegee 120, the squeegee 120 is applied to the screen 10 with the appropriate pressing force. It can be pressed, and an appropriate amount of cream solder can be printed on the printed circuit board 20.
- the air cylinder 56 for adjusting the pressing force is not provided with a seal member at a portion where the cylinder housing 64 and the piston 62 slide.
- relief grooves 76 and 78 are formed in the sliding portion instead of disposing the seal member, so that substantial airtightness is ensured.
- the pressing force adjusting air cylinder 56 is free from variations in drag due to the frictional force of the seal member that occurs in a general air cylinder. Therefore, according to the air cylinder 56 for adjusting the pressing force, it is possible to improve the accuracy of controlling the pressing force of the squeegee 120 to the screen 10.
- the solder paste printer 100 is an example of a screen printer.
- the air cylinders 42 and 56 are examples of fluid pressure cylinders.
- the compression coil spring 86 is an example of an elastic member.
- the air source 98 is an example of a fluid supply unit.
- Response times RT1 and RT2 required to reduce or increase the control pressure PX by 0.1 MPa are examples of predetermined response times.
- Cream solder is an example of a printing material.
- the printed circuit board 20 is an example of an object.
- Air is an example of a fluid.
- the configuration for controlling the internal pressure P of the second air chamber 74 is an example.
- an electromagnetic direction switching valve that switches between supply and discharge of air is provided instead of the air regulator 96, and the control unit The electromagnetic direction switching valve may be controlled by 148.
- the control unit 148 may set the timing for switching the electromagnetic direction switching valve as the timing for starting the measurement of the response times RT1 and RT2.
- the printing press 100 may be configured to control the internal pressure of the first air chamber 72 instead of controlling the internal pressure P of the second air chamber 74.
- the squeegee unit 40 may be configured such that the squeegee 120 descends when the internal pressure P of the second air chamber 74 is increased.
- the compression coil spring 86 is not limited to one, and a plurality of compression coil springs 86 may be provided. Further, the pressing force adjusting air cylinder 56 may have a configuration in which a seal member is disposed in a portion where the cylinder housing 64 and the piston 62 slide.
- the printing press 100 performs printing by moving the squeegee 120 relative to the fixed screen 10, but the screen 10 may be moved relative to the squeegee 120. Further, the printing press 100 may perform printing while moving both the screen 10 and the squeegee 120.
- the fluid supplied to the pressing force adjusting air cylinder 56 is not limited to air, but may be a gas such as nitrogen or a liquid such as oil.
- the control unit uses the response times that are different between control for causing the squeegee to approach the screen and control for separating the squeegee from the screen.
- a screen printing machine according to any one of the above. According to the screen printing machine, the control unit uses the optimized response time for when the squeegee approaches the screen and when the squeegee moves away from the screen, so that the squeegee and the screen come into contact with each other. It becomes possible to detect the internal pressure at the time of separation more accurately.
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- Screen Printers (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
Abstract
Description
図3に示すように、シリンダハウジング64の第2エア室74には、エアレギュレータ96からシリンダハウジング64の開口64Aを通じてエアが供給される。シリンダハウジング64のピストン62は、第2エア室74の内部圧力に応じて昇降する。エアレギュレータ96は、エア源98と第2エア室74との間に接続されている。エアレギュレータ96は、エア源98から供給される所定値の圧力のエアを、制御部148の制御に基づいて圧力を調整してから第2エア室74に供給する。第2エア室74は、エアレギュレータ96から供給されるエアの圧力に応じてエアが供給され、あるいはエアが排出されて内部圧力が変更される。また、エアレギュレータ96とシリンダハウジング64との間には、第2エア室74の内部圧力を検出する圧力センサ114が設けれている。圧力センサ114は、検出結果を制御部148に出力する。なお、図3は、印刷を実施していない状態を示しており、上昇端位置となっている。制御部148は、例えば、エアレギュレータ96を制御して大気圧に比べて高い圧力のエアを第2エア室74に供給し、スキージ120を図3の上昇端位置まで上昇させる。
本実施形態の印刷機100は、2組のスキージユニット40により交互に印刷を行う。制御部148は、スキージ移動装置(サーボモータ34)を制御し、2組のスキージユニット40をY軸方向の一方から他方に向かって移動させる。制御部148は、スキージユニット40を移動させる際に、移動方向において上流側に位置するスキージユニット40のスキージ120を下降させてスクリーン10に所望の押付力で接触させる。スキージユニット40は、スクリーン10に沿って移動させられ、スクリーン10上に載せられたクリーム半田をスキージ120により掻き取りつつ、スクリーン10に設けられた透孔を通してプリント基板20上に印刷する。この際、下流側に位置するスキージユニット40は、スキージ昇降用エアシリンダ42のピストンロッド46と、押圧力調節用エアシリンダ56のシリンダハウジング64とを上昇端位置とし、スキージ120をスクリーン10に接触させないようにする。また、印刷機100は、印刷が終了すると、印刷が終了したプリント基板20の搬出、及び次のプリント基板20の搬入を実施する。そして、印刷機100は、先の印刷で使用したスキージ120を上昇させるとともに、先の印刷で使用していないスキージ120を下降させ互いの位置を入れ替え、今度はスキージユニット40をY方向の逆方向に移動させながら印刷を実施する。
FC=FA+W-FB・・・・・・・(1)
上記式(1)におけるFAは、圧縮コイルスプリング86による下方向きの付勢力である。Wは、押圧力調節用エアシリンダ56によって昇降させられる各種部材(フレーム38、スキージ昇降用エアシリンダ42、支持部材102、直線移動部材104、回動部材108、支持軸106、スキージ保持部材118及びスキージ120)の総重量である。FBは、押圧力調節用エアシリンダ56がスキージ120に作用させる圧縮コイルスプリング86の付勢力に抗する上方向きの力である。
FA=k×L・・・・・・・・・・・・・・(2)
上記式(2)におけるkは、圧縮コイルスプリング86のバネ定数である。Lは、圧縮コイルスプリング86の上下方向に沿った長さである。
また、上記式(1)の力FBは、次式で表される。
FB=S×P・・・・・・・・・・・・・・(3)
上記式(3)におけるSは、シリンダハウジング64の断面積(シリンダハウジング64内のピストン62を上下方向の一方から見た場合の表面積)である。Pは、第2エア室74の内部圧力である。
FC=k×L1+W-S×P1・・・・・・(4)
FC=k×L2+W-S×P2・・・・・・(5)
スキージ120がスクリーン10に接触していない状態において力の釣り合った位置で停止した場合に力FCがゼロとなるため、圧縮コイルスプリング86の長さLの変化量ΔLは、上記式(4)、(5)から次式で表される。
ΔL=L2-L1=(P2-P1)S/k・・・・(6)
ΔV1=S×ΔL=S2(P2-P1)/k・・・・(7)
従って、シリンダハウジング64は、エアレギュレータ96によって内部圧力がP1からP2に変更されスキージ120の下降が停止するまでの間に、変化量ΔV1に相当するエアが第2エア室74から排出されることとなる。
RT1=ΔV1/Q={S2(P2-P1)/k}/Q・・・・・・(8)
ΔV2=V3-(P3/P4)V3=V3×(P4-P3)/P4・・(9)
上記式(9)におけるV3は、スキージ120がスクリーン10に接触した状態における第2エア室74の体積である。
RT2=ΔV2/Q={V3×(P4-P3)/P4}/Q・・・・・(10)
そして、スキージ120は、第2エア室74の減圧(力FBの減少)に応じた力FC(式(1)参照)でスクリーン10に押し付けられることとなる。
<効果1>スキージ120は、押圧力調節用エアシリンダ56の第2エア室74の内部圧力Pが減圧されると、スクリーン10に接近する方向に向かって下降する。制御部148は、エアレギュレータ96に対して第2エア室74の内部圧力Pを減圧、あるいは加圧する制御を開始してから圧力センサ114の検出値が目標の内部圧力Pの値に到達するまでの応答時間RT1,RT2に基づいて、エアレギュレータ96に対する制御を実行する。
例えば、上記実施形態において、第2エア室74の内部圧力Pを制御する構成は一例であり、例えば、エアレギュレータ96に代えてエアの供給及び排出を切り替える電磁方向切換弁を設けて、制御部148によって電磁方向切換弁を制御してもよい。この場合、例えば、制御部148は、電磁方向切換弁を切り替えるタイミングを、応答時間RT1,RT2の計測を開始するタイミングとしてもよい。
また、印刷機100は、第2エア室74の内部圧力Pの制御に代えて、第1エア室72の内部圧力を制御する構成でもよい。また、スキージユニット40は、第2エア室74の内部圧力Pが加圧されることでスキージ120が下降する構成でもよい。
また、押圧力調節用エアシリンダ56は、シリンダハウジング64とピストン62とが摺動する部分にシール部材が配設された構成でもよい。
また、押圧力調節用エアシリンダ56に供給する流体は、エアに限らず、窒素等の気体でもよく、油等の液体でもよい。
(イ)前記制御部は、前記スキージを前記スクリーンに接近させる制御と、前記スキージを前記スクリーンから離間させる制御とで、異なる前記応答時間を用いることを特徴とする請求項1乃至請求項5のいずれかに記載のスクリーン印刷機。
当該スクリーン印刷機によれば、制御部は、スキージがスクリーンに接近する場合と、スキージがスクリーンから離間する場合とに分けて最適化された応答時間を用いることで、スキージとスクリーンとが接触及び離間する際の内部圧力をより正確に検出することが可能となる。
Claims (5)
- 複数の透孔を有するスクリーンと、
前記スクリーン上を摺動し、前記スクリーンの前記透孔から被印刷剤を対象物に印刷するスキージと、
シリンダハウジングの内部圧力に応じて前記スキージを前記スクリーンに接近、あるいは離間するいずれかの方向に付勢する流体圧シリンダと、
前記シリンダハウジングの内部圧力を検出する圧力センサと、
前記流体圧シリンダに対する単位時間あたりの所定流量の流体の供給あるいは排出により前記内部圧力を変更する制御を開始してから、前記圧力センサの検出値が目標の値に到達するまでの応答時間に基づいて前記内部圧力を制御する制御部と、
を備えることを特徴とするスクリーン印刷機。 - 前記制御部は、前記内部圧力を所定の圧力だけ変更するのに要する前記応答時間を、所定応答時間として計測し、前記所定応答時間の変化に基づいて前記スクリーンに対する前記スキージの接触又は離間の別を検出し、前記スキージの前記スクリーンへの接触を検出した後に、さらに前記内部圧力を制御して前記スキージを前記スクリーンに押しつける押圧力を変更することを特徴とする請求項1に記載のスクリーン印刷機。
- 前記流体圧シリンダに流体を供給する流体供給部と、
前記流体供給部と前記流体圧シリンダとの間に接続され、前記流体供給部から供給される前記流体の圧力を前記制御部の制御に基づいて所定の圧力に調整するレギュレータと、
を備えることを特徴とする請求項1又は請求項2に記載のスクリーン印刷機。 - 前記スキージを、前記流体圧シリンダによる付勢力に抗する向きに付勢する弾性部材を備えることを特徴とする請求項1乃至請求項3のいずれかに記載のスクリーン印刷機。
- 前記流体圧シリンダは、エアシリンダであり、前記シリンダハウジングとピストンとが摺動する部分にシール部材が配設されていないことを特徴とする請求項1乃至請求項4のいずれかに記載のスクリーン印刷機。
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PCT/JP2014/054448 WO2015128929A1 (ja) | 2014-02-25 | 2014-02-25 | スクリーン印刷機 |
CN201480076183.3A CN106029383B (zh) | 2014-02-25 | 2014-02-25 | 丝网印刷机 |
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