JP2009241286A - Printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing apparatus for suppressing a situation that printing quality of a solder for a large substrate is made different from printing quality of the solder for a small substrate. <P>SOLUTION: The printing apparatus 100 is equipped with a solder supply part 72 arranged on a printed board 200 and supplying the solder to an upper surface of a mask 300 where an aperture of a predetermined pattern corresponding to the printed board 200 is formed, and a regulator 750 for adjusting an amount of the solder supplied from the solder supply part 72 corresponding to the total area of the aperture of the mask 300 arranged on the printed board 200 that is an object to be printed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing apparatus, and more particularly to a printing apparatus including a solder supply unit that supplies solder.

  2. Description of the Related Art Conventionally, a printing apparatus including a solder supply unit that supplies solder is known (see, for example, Patent Document 1).

  In the printing apparatus of Patent Document 1, a paste supply unit (solder supply unit) is provided above the mask plate. The paste supply unit includes a syringe containing cream solder, and cream solder is supplied to the upper surface of the mask plate by discharging cream solder from a discharge nozzle (supply port) provided at the lower end of the syringe. It is comprised so that.

  Conventionally, a paste coating apparatus for coating a paste on a test plate is known (see, for example, Patent Document 2). In the paste coating apparatus of Patent Document 2, a dispenser is provided that discharges paste from a syringe by supplying pressurized gas to the syringe. In this paste coating apparatus, the amount of paste applied on the test plate is detected by a sensor, and the pressure of the pressurized gas of the dispenser can be adjusted based on the detected amount of coating. . Thereby, it is possible to control the amount of paste applied to be a predetermined amount.

  When the configuration of Patent Document 2 is applied to the configuration of Patent Document 1, the amount of solder on the mask is detected by a sensor, and the pressure of the pressurized gas in the syringe is set based on the detection result of the sensor. By adjusting, the printing apparatus is configured to be able to control the supply amount of the solder to a predetermined amount.

JP 2004-58299 A JP 2007-245033 A

  Here, in the printing apparatus, when the substrate to be printed is large, the total area of the openings of the mask used for printing the substrate also increases, so that the amount of solder required for printing the substrate also increases. Further, when the substrate is small, the total area of the openings of the mask used for printing the substrate is also reduced, so that the amount of solder required for printing the substrate is also reduced. However, in the configuration in which the above-described Patent Documents 1 and 2 are combined, the amount of solder discharged is simply controlled so as to be a predetermined amount, so that a large substrate is printed and a small substrate is printed. It is considered that the same fixed amount of solder is supplied (discharged) in some cases. For this reason, there is a problem in that the print quality of solder on a large substrate is different from the print quality of solder on a small substrate.

  The present invention has been made to solve the above problems, and one object of the present invention is that the print quality of solder on a large board differs from the print quality of solder on a small board. It is an object of the present invention to provide a printing apparatus that can be suppressed.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, a printing apparatus according to an aspect of the present invention includes a solder supply unit that is disposed on a substrate and supplies solder to the upper surface of a mask in which openings of a predetermined pattern corresponding to the substrate are formed. And a solder supply adjusting unit for adjusting the amount of solder supplied from the solder supply unit in accordance with the total area of the mask opening. The solder supply adjustment unit may be configured to adjust the amount of solder supplied from the solder supply unit by a user operation, or to adjust the amount of solder supplied from the solder supply unit by electric control. It may be configured. Furthermore, the mask may be arranged on the substrate by placing the mask on the stationary or moving substrate, or by bonding the substrate from below to the lower surface of the stationary or moving mask. Also good.

  In the printing apparatus according to this aspect, as described above, the amount of solder supplied from the solder supply unit is adjusted according to the total area of the openings of the masks arranged on the substrate to be printed, thereby increasing the size of the substrate. When printing a small substrate, increase the amount of solder to be supplied so as to correspond to the total area of the openings of the mask used for printing the large substrate. It is possible to reduce the amount of solder supplied so as to correspond to the total area of the openings of the mask used. As a result, the amount of solder on the mask can be kept constant when printing a large board and when printing a small board, so the print quality of solder on a large board and the print quality of solder on a small board can be reduced. It is possible to suppress the difference.

  In the printing apparatus according to the above aspect, the solder supply unit preferably stores the solder therein and has a supply port for discharging the stored solder, and solders a gas having a predetermined pressure. A gas source to be supplied to the housing part, and a switch provided in a gas passage between the gas source and the solder housing part to switch the pressure of the solder housing part between a pressurized state and an atmospheric pressure state based on the gas supplied from the gas source. The solder supply adjusting unit is provided in a gas passage between the gas source and the solder accommodating unit, and supplies the gas pressure from the gas source to the solder accommodating unit corresponding to the total area of the mask opening. It is comprised so that the 1st pressure adjustment part which can adjust the pressure of the gas to be adjusted is included. With this configuration, when printing a large substrate, the pressure of the gas supplied to the solder accommodating portion can be increased by the first pressure adjusting portion, so that the amount of solder supplied per unit time is increased. be able to. Thus, when a large amount of solder is supplied to print a large substrate, the large amount of solder can be supplied in a short time. Further, when printing a small substrate, the pressure of the gas supplied to the solder accommodating portion can be reduced by the first pressure adjusting portion, so that the amount of solder supplied per unit time can be reduced. Thus, when a small amount of solder is supplied to print a small substrate, the small amount of solder can be supplied over a relatively long time. Thereby, unlike a case where a small amount of solder is supplied in a short time, it is possible to suppress a deviation between a necessary supply amount and an actually supplied amount. That is, since the viscosity of the solder is relatively high, even when a gas is supplied to the solder accommodating portion, the supply amount varies due to the viscosity. Since it is possible to suppress the variation in the supply amount by supplying the solder over a relatively long time, it is possible to suppress the deviation between the necessary supply amount and the actually supplied amount.

  In the configuration in which the solder supply adjusting unit includes the first pressure adjusting unit, it is preferable that the solder supply adjusting unit is provided at a position where the user can operate, and the second pressure capable of adjusting the adjusting pressure of the first pressure adjusting unit. A pressure adjustment unit is further provided. If comprised in this way, it will become difficult for a user to operate a 1st pressure adjustment part directly resulting from providing a 1st pressure adjustment part in the gas passage between a gas source and a solder accommodating part. Even in this case, the adjustment pressure of the first pressure adjustment unit can be easily adjusted by operating the second pressure adjustment unit. Thereby, the user can easily adjust the pressure of the gas from the gas source corresponding to the size of the substrate.

  In the configuration in which the solder supply adjustment unit includes the first pressure adjustment unit, it is preferable that the solder supply unit further includes at least a control unit that controls driving of the solder supply unit, and the solder supply unit has a remaining amount of solder stored in the solder storage unit. The control unit holds a set value of the solder supply amount set corresponding to the total area of the mask opening, and the control unit is controlled by the remaining amount detection unit. Based on the detected remaining amount of solder in the solder container, the amount of solder supplied from the supply port is calculated, and when the calculated supply exceeds the set value, the pressure in the solder container is at atmospheric pressure. It is comprised so that a switching means may be controlled. According to this configuration, when the supply amount of solder reaches a set value, the on-off valve can be opened to end the supply of solder. Therefore, an amount of solder corresponding to the total area of the mask opening can be removed. Can be supplied accurately.

  In the configuration in which the solder supply adjustment unit includes the first pressure adjustment unit, preferably, the solder supply adjustment unit further includes at least a control unit that controls driving of the solder supply unit, and when supplying solder to the upper surface of the mask, the control unit The switching means is configured to control the pressure of the solder accommodating portion to be in a pressurized state for a time corresponding to the total area of the opening. If comprised in this way, supply of solder can be performed easily, without providing a residual amount detection part.

  In the configuration in which the solder supply unit includes the switching unit, the switching unit has a first state in which the gas source side and the solder accommodating unit side communicate with each other with the switching unit as a boundary, and the gas path switching unit as a boundary. And a valve mechanism for switching to a second state in which the solder accommodating portion side is opened to the atmosphere with the gas passage switching means as a boundary. According to this configuration, when the valve mechanism is switched to the second state, the supply of solder can be stopped by setting the pressure of the solder accommodating portion to atmospheric pressure, and the gas source with the switching means, that is, the valve mechanism as a boundary. Since the pressure of the gas passage on the side is maintained, when the valve mechanism is next switched to the first state, the pressure is quickly applied to the solder accommodating portion, and the solder can be supplied without delay.

  In this case, it is preferable that the solder supply unit is provided on the solder accommodating unit side of the gas passage in the gas passage, and when the switching unit is switched from the first state to the second state, It further includes an exhaust device that releases the pressure to the atmosphere. With this configuration, when the switching unit is set to the second state in order to end the supply of the solder, extra solder is supplied due to the pressure inside the solder accommodating portion remaining. Can be suppressed. As a result, the amount of solder corresponding to the total area of the mask openings can be supplied more accurately.

  In the configuration in which the solder supply adjustment unit includes the first pressure adjustment unit, it is preferable that the solder supply unit further includes at least a control unit that controls driving of the solder supply unit. The discharge stop member further includes a cutting member that cuts the solder suspended from the supply port, and a closing member that closes the supply port, and the control unit sets the pressure of the solder accommodating unit to an atmospheric pressure state. When the switching means is switched, the discharge stop member is controlled so that the solder suspended from the supply port is cut by the cutting member and the discharge stop member is moved so as to close the supply port by the closing member. It is configured. With this configuration, when the switching unit is set to the second state in order to end the supply of the solder, the discharge stop member is moved, thereby not only cutting the solder suspended from the supply port by the cutting member. The supply port can be closed by the closing member.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 and 2 are a perspective view and a plan view, respectively, showing the overall configuration of the printing apparatus according to the first embodiment of the present invention. 3 to 7 are diagrams for explaining the structure of the printing apparatus shown in FIG. The structure of the printing apparatus 100 according to the first embodiment of the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 and 2, the printing apparatus 100 according to the first embodiment includes a base 1, a substrate transport unit 2 that is provided on the base 1 and transports a printed circuit board 200, and a substrate transport unit 2. The printing unit 3 is provided above and prints solder on the printed circuit board 200. The printed circuit board 200 is an example of the “board” in the present invention. The board conveyance unit 2 is provided between the conveyor 4a that carries in the printed board 200 before printing, the conveyor 4b that carries out the printed board 200 after printing, and the conveyors 4a and 4b, and holds the printed board 200. And a substrate positioning / elevating device 5 for placing the printed circuit board 200 at a printing position P (see FIG. 2) in contact with the lower surface of the mask 300 described later. The conveyors 4a and 4b are provided so as to extend in the substrate transport direction (X direction). In addition, the printing unit 3 includes a mask support unit 6 that supports a mask 300 used for printing, a printing unit 7 that prints solder on the printed circuit board 200 through the mask 300, and a printing unit 7 that prints in the printing direction (Y Drive unit 8 driven in the direction). The mask 300 is made of a plate-like member having flexibility, and has an opening region 301 in which openings having a predetermined pattern are formed. The mask 300 is fixed to a frame 302 made of a highly rigid member.

  The substrate positioning lifting device 5 includes a Y-axis table 51, an X-axis table 52, an R-axis table 53, and a Z-axis table 54, and includes an X direction, a Y direction, a Z direction, and an R direction (rotation directions in a horizontal plane). ) Can be moved.

  As shown in FIG. 2, a rail 51a is provided on the base 1 so as to extend in the Y direction, and the Y-axis table 51 is slidably attached to the rail 51a. Further, the Y-axis table 51 is configured to be driven in the Y direction by a servo motor and a ball screw mechanism (not shown). On the Y-axis table 51, a rail 52a is provided so as to extend in the X direction. The X-axis table 52 is slidably attached to the rail 52a, and the X-axis table is driven by a servo motor and a ball screw mechanism (not shown). 52 is configured to be driven in the X direction with respect to the Y-axis table 51. A support mechanism 53a is provided on the X-axis table 52, and the R-axis table 53 is rotatably supported by the support mechanism 53a in a horizontal plane. Further, the R-axis table 53 is rotationally driven by a servo motor and a ball screw mechanism (not shown). A guide shaft 54 a that is fixed to the Z-axis table 54 and extends in the Z direction is inserted into the R-axis table 53, and the Z-axis table 54 is moved relative to the R-axis table 53 by a servo motor and a ball screw mechanism 54 b (not shown). It is configured to be driven in the direction.

  The Z-axis table 54 is provided with a pair of conveyors 55 extending in the X direction. As shown in FIG. 1, the conveyor 55 is arranged so as to be connected to the conveyors 4a and 4b in a state where the Z-axis table 54 is lowered. Thereby, it is possible to transfer the printed circuit board 200 before printing from the conveyor 4a to the conveyor 55 and transfer the printed circuit board 200 after printing from the conveyor 55 to the conveyor 4b.

  Further, the Z-axis table 54 is provided with a lifting table 56 (see FIG. 2) that can be lifted in the vertical direction (Z direction) in the region between the pair of conveyors 55. A plurality of pins (not shown) for supporting the printed circuit board 200 from below are arranged on the upper surface of the lifting table 56, and the lifting table 56 is attached to the Z-axis table 54 via a slide shaft 56a extending in the vertical direction. On the other hand, it is slidably attached in the vertical direction. The lift table 56 is configured such that the lift table 56 is driven in the Z direction by a servo motor and a rack and pinion mechanism (not shown). When the lifting table 56 is raised and lowered, the printed board 200 on the conveyor 55 is raised and positioned at the same height as the clamp pieces 57a and 57b, and is also held by the clamp pieces 57a and 57b. The lower surface of 200 is supported by a pin (not shown). Further, after the printing, after the holding of the printed board 200 by the clamp pieces 57a and 57b is released, the lifting table 56 is lowered, so that the printed board 200 can be placed on the conveyor 55. After the printed printed board 200 is placed on the conveyor 55, the lifting table 56 is further lowered to a position where it does not interfere with the printed board 200 to be carried out and carried in.

  The Z-axis table 54 is provided with clamp pieces 57 a and 57 b that clamp the printed circuit board 200 on the conveyor 55. The clamp piece 57a is fixed to the Z-axis table 54, while the clamp piece 57b is provided to be movable in the Y direction. Thus, by moving the clamp piece 57b in the Y direction while pressing the printed board 200, the printed board 200 can be easily clamped by the clamp piece 57a and the clamp piece 57b.

  The mask support 6 is fixedly installed above the substrate positioning lift 5 via the frame members 1a and 1b of the base 1, and a pair of support plates 6a for supporting the vicinity of the outer edge of the mask 300 from below (FIG. 1). The mask 300 is supported by a clamp piece 6b that presses the upper surface of the frame 302 of the mask 300 placed on the support plate 6a from above.

  The printing unit 7 slides on the upper surface of the mask 300 while pressing the solder to squeeze the solder onto the printed circuit board 200 through the opening of the mask 300, and the solder supply for supplying the solder onto the mask 300. And a support member 73 that supports the solder supply unit 72 and the squeegee unit 71 and can reciprocate in the printing direction (Y direction).

  The squeegee unit 71 is provided on the side surface of the support member 73 on the arrow Y1 direction side, and slides on the upper surface of the mask 300 with the printed circuit board 200 supported by the lifting table 56 in contact with the lower surface of the mask 300 during printing. The squeegee 711 is moved around the squeegee 711, and the squeegee 711 is moved around the squeegee 711 up and down, and a lifting mechanism 712 that applies a downward printing pressure load to the squeegee 711 at the time of printing, and a rotation shaft 713b extending in the X direction And a rotating mechanism portion 713 to be moved. At the time of printing, the squeegee 711 is lowered by the lifting mechanism 712 and brought into contact with the mask 300, and when the printing direction is changed, the squeegee 711 is rotated by the lifting mechanism 712 being lifted. It is rotated by the part 713. The rotation mechanism unit 713 rotates the squeegee 711 to the first inclination angle so that the solder pressing surface 711a faces the arrow Y1 direction during printing in the arrow Y1 direction, and the solder pressing surface 711a moves to the arrow Y2 during printing in the arrow Y2 direction. The squeegee 711 is configured to rotate at the second inclination angle so as to face the direction. By switching the first tilt angle and the second tilt angle of the squeegee 711 by the rotation mechanism unit 713, it is possible to perform printing in the direction of the arrow Y1 and printing in the direction of the arrow Y2 with one squeegee 711.

  The elevating mechanism 712 includes a fixing portion 712a fixed to the side surface of the support member 73, a servo motor 712b (see FIG. 1) provided on the side of the fixing portion 712a in the X direction, a ball screw shaft 712c, and a servo motor. And a belt 712d for transmitting the rotation of the motor shaft 712b to the ball screw shaft 712c. The ball screw shaft 712c is fixed to the fixing portion 712a so as to be rotatable. In addition, a movable portion 712e that is movable in the vertical direction with respect to the fixed portion 712a is provided on a side surface of the fixed portion 712a. The movable portion 712e is screwed with the ball screw shaft 712c, and the movable portion 712e can be moved in the vertical direction by rotating the ball screw shaft 712c via the belt 712d by the servo motor 712b. The movable portion 712e is attached to the fixed portion 712a via a compression coil spring (not shown), and the driving force of the servo motor 712b is transmitted to the movable portion 712e via the belt 712d, the ball screw shaft 712c, and the compression coil spring. In addition, the squeegee 711 presses the printed board 200 in a state where the lower surface is supported by the elevating table 56 and is in contact with the lower surface of the mask 300, and becomes a printing pressure load.

  The rotation mechanism unit 713 includes a servo motor 713a provided in the movable unit 712e and a rotation shaft 713b to which the squeegee 711 is fixed. The rotation of the motor shaft of the servo motor 713a is configured to be transmitted to the rotation shaft 713b by a plurality of gears (not shown).

  The solder supply unit 72 includes a syringe 721 in which solder is accommodated, and an arm 722 that supports the syringe 721 and is fixed to a side surface of the support member 73 on the arrow Y1 direction side. The syringe 721 is an example of the “solder housing portion” in the present invention. The syringe 721 supported by the arm 722 is arranged at a predetermined interval on the arrow Y1 direction side with respect to the approximate center portion of the squeegee 711 in the X direction. As shown in FIGS. 5 and 6, a supply port 721 a for discharging solder is provided at the lower portion of the syringe 721. The supply port 721a is provided so as to protrude downward from the lower surface 723a of the support member 723 that supports the syringe 721. As shown in FIG. 6, the syringe 721 has a built-in piston 721b. In addition, it is possible to supply air of a predetermined pressure into the syringe 721 via the air supply pipe 724 connected to the upper part of the syringe 721 and exhaust the air from the syringe 721. By supplying air to the syringe 721 and pressurizing the piston 721b, solder is discharged from the supply port 721a. Further, a capacitive sensor 725 is provided on the side of the syringe 721. This sensor 725 can detect that the solder in the syringe 721 is less than a predetermined amount. In addition, a sensor 721c (see FIG. 6) for detecting the position of the piston 721b is provided on the upper portion of the syringe 721. The sensor 721c includes a light emitting unit that emits laser light toward the piston 721b and a light receiving unit that receives the reflected light of the laser light from the piston 721b. The light emitting unit emits laser light under the control of the control unit 9 (see FIG. 3), and the detection signal detected by the light receiving unit is input to the control unit 9. The sensor 721c is an example of the “remaining amount detection unit” in the present invention. Air is an example of the “gas” in the present invention.

  Further, as shown in FIGS. 5 and 6, the solder supply unit 72 further includes a discharge stop member 726 and a cylinder unit 727 for driving the discharge stop member 726. The discharge stop member 726 is configured to be movable in the X direction along the lower surface 723 a of the support member 723 that supports the syringe 721. The discharge stop member 726 is fixed to the piston 727a of the cylinder unit 727. A space on one side of the piston 727a inside the cylinder unit 727 is connected to an air supply pipe 727b, and a space on the other side is connected to an air supply pipe 727c. The piston 727a is configured to move in the X direction by the air supplied via the air supply pipes 727b and 727c. Further, the discharge stop member 726 is provided at a plate-like closing member 726a disposed at a height position near the lower side of the supply port 721a, and a distal end portion in the arrow X1 direction of the closing member 726a. And a wire 726b arranged to extend in a direction orthogonal to the direction (X direction). The wire 726b is an example of the “cutting member” in the present invention. The discharge stop member 726 has a retracted position (shown by a solid line in FIG. 6) where the wire 726b is located on the arrow X2 direction side with respect to the supply port 721a, and a standby position (see FIG. 6) where the closing member 726a is positioned below the supply port 721a. 6 is illustrated in FIG. 6, and when the solder is supplied, the discharge stop member 726 moves to the retracted position, and when the solder is not supplied, the discharge is stopped. The member 726 is moved to the standby position, and the supply port 721a is closed by the closing member 726a.

  In the first embodiment, as shown in FIG. 4, the solder supply unit 72 further includes a pressurized air supply unit 740 that supplies air of a predetermined pressure to the syringe 721 and the cylinder unit 727. 4 and 7, the pressurized air supply unit 740 is connected to an air source 741, a valve 742a connected to the air supply pipe 724 of the syringe 721, and air supply pipes 727b and 727c of the cylinder unit 727. An electromagnetic valve 742b. The electromagnetic valve 742 including the electromagnetic valves 742a and 742b is attached to the end portion of the support member 73 in the arrow X1 direction. The air source 741 is an example of the “gas source” in the present invention, and the electromagnetic valve 742a is an example of the “valve mechanism” in the present invention. The air source 741 is configured to supply air with a constant pressure to the syringe 721 and the cylinder unit 727. The electromagnetic valve 742a is provided in the air passage A between the air source 741 and the syringe 721. The state in which the air passage A communicates with the air source 741 (first state) and the open state in which the air passage A is opened to the atmosphere. (Second state. In this state, the air passage between the air source 741 and the electromagnetic valve 742a is sealed by the electromagnetic valve 742a). The electromagnetic valve 742b includes two air passages: an air passage from the air source 741, an air passage B to the air supply pipe 727b of the cylinder unit 727, and an air passage C to the air supply pipe 727c of the cylinder unit 727. The open air pipes (not shown) are connected to each other. A third state in which the air passage B is connected to the air source 741 and the air passage C is opened to the atmosphere by the electromagnetic valve 742b, and a fourth state in which the air passage B is opened to the atmosphere and the air passage C is connected to the air source 741. It can be switched to and. The air passage A is an example of the “gas passage” in the present invention.

  In the first embodiment, as shown in FIGS. 4 and 7, a regulator 750 is provided between the electromagnetic valve 742 a in the air passage A and the syringe 721. The regulator 750 can reduce the pressure of the air from the air source 741 and supply the syringe 721 with a stable pressure with little fluctuation. The air passage A1 between the electromagnetic valve 742a and the regulator 750 and the air passage A2 between the regulator 750 and the syringe 721 are connected via a check valve 751 (a backflow prevention valve). The check valve 751 is configured to allow the fluid to pass only in one direction and to automatically close when the fluid tries to flow in the opposite direction. By providing the check valve 751, the air flowing from the syringe 721 toward the electromagnetic valve 742 a in the air passage A passes through the check valve 751, and the air flowing from the electromagnetic valve 742 a toward the syringe 721 is blocked by the check valve 751. Is done. That is, since the check valve 751 is provided, when the electromagnetic valve 742a is switched to the second state, the air passage A1 drops to atmospheric pressure, and air higher than the atmospheric pressure in the syringe 721 passes through the air passage A2 and the regulator 750 It is possible to bypass the check valve 751 and flow to the air passage A1. As a result, the air in the syringe 721 becomes the same as the atmospheric pressure, and the solder supply is stopped. The regulator 750 is an example of the “solder supply adjusting unit” and the “first pressure adjusting unit” in the present invention. Further, the solenoid valve 742a and the check valve 751 as an example of the “valve mechanism” of the present invention constitute an example of the “switching means” of the present invention.

  The regulator 750 is a so-called air operator regulator, and is provided with an air supply pipe 750a (see FIG. 4). By changing the pressure of the air supplied to the regulator 750 via the air supply pipe 750a, the regulator 750 can make the pressure of the air passage A2 lower (depressurize) than the pressure of the air passage A1, and the air passage A2 It is possible to adjust the pressure to a stable pressure (pressure regulation level) with little fluctuation. The air supply pipe 750a of the regulator 750 is connected via an air passage D to an external regulator 760 that is provided outside the printing apparatus 100 and can be easily operated by the user. The external regulator 760 is connected to the air source 741 via the air passage E. When the user operates the external regulator 760, the air supplied to the air supply pipe 750a of the regulator 750 via the air passage D is controlled. It is possible to change the pressure. Thus, the user can operate the external regulator 760 to change the pressure regulation level of the regulator 750 provided inside the printing apparatus 100, so the pressure of the air supplied to the syringe 721 can be changed by the user. Can be easily adjusted. The external regulator 760 is an example of the “second pressure adjusting unit” in the present invention.

  The air supply pipe 724 connected to the upper portion of the syringe 721 is provided with a quick exhaust valve 770 composed of a so-called electromagnetic on-off valve. The quick exhaust valve 770 opens the air supply pipe 724 to the atmosphere by opening the electromagnetic valve 742a in conjunction with the transition from the first state to the second state, thereby quickly bringing the air in the syringe 721 to atmospheric pressure. It is configured to lower. Specifically, when the electromagnetic valve 742a changes from the first state to the second state, the air passage A1 first passes through the electromagnetic valve 742a and first decreases to the atmospheric pressure, and air higher than the atmospheric pressure in the syringe 721 flows. The air passes through the air passage A2, passes through the check valve 751, flows to the air passage A1, and the pressure of the air in the air passage A2, the air supply pipe 724, and the syringe 721 decreases later than the air passage A1. At this time, since the quick exhaust valve 770 is configured to open, the air supply pipe 724 is directly opened to the atmosphere via the quick exhaust valve 770, so that the quick exhaust valve 770 disposed in the vicinity of the syringe 721 causes the syringe 721. The inside air can be exhausted rapidly to reduce the pressure. The quick exhaust valve 770 is an example of the “exhaust device” in the present invention.

  The drive unit 8 includes a pair of guide rails 81 that support the support member 73 so as to be movable in the Y direction, a ball screw shaft 82 that extends in the Y direction, and a servo motor 83 that rotates the ball screw shaft 82. The support member 73 is provided with a ball nut 73a to which the ball screw shaft 82 is screwed. The support member 73 is configured to move in the Y direction when the ball screw shaft 82 is rotated by the servo motor 83. In the first embodiment, the squeegee unit 71 and the solder supply unit 72 are supported by the support member 73, and the support member 73 is driven by the drive unit 8, whereby the squeegee 711 of the squeegee unit 71 and the syringe of the solder supply unit 72. 721 is integrally driven by one drive unit 8.

  Further, as shown in FIG. 3, the servo motor 83 of the drive unit 8 for moving the support member 73 in the printing direction (Y direction) and the squeegee 711 are moved up and down, and the squeegee 711 is loaded with a printing pressure load. The controller 9 controls the drive of the servo motor 712b, the servo motor 713a for rotating the squeegee 711, the electromagnetic valve 742a for discharging the solder, the electromagnetic valve 742b for driving the discharge stop member 726, and the like. The control unit 9 is configured to supply solder by driving the electromagnetic valves 742a and 742b based on the detection results of the sensors 721c and 725. Further, substrate data is stored in the storage unit 9 a of the control unit 9. The board data includes a supply start time when supplying solder (a time during which the electromagnetic valve 742a is in the first state), a supply amount (set value) in one solder supply, and a supply time (electromagnetic valve 742a). From the first state to the second state). The supply amount (set value) in one solder supply is set to a large value in the case of printing a large printed circuit board 200 using the mask 300 having a large total area of the opening, and the mask having a small total area of the opening. In the case of printing a small substrate 200 using 300, it is set to a small value. The supply time is set to a short time in the case of printing a large printed circuit board 200 using the mask 300 having a large total area of the openings, and the supply time of the small board 200 using the mask 300 having a small total area of the openings is set. In some cases it is set to a relatively long time. In addition, the user can set the supply interval for supplying the solder every time the printed circuit board 200 is printed, and the set value is also stored in the storage unit 9 a of the control unit 9. .

  As shown in FIG. 3, a display unit 101 is provided outside the printing apparatus 100 so that the printing status of the printing apparatus 100 is displayed. The display unit 101 is a touch panel type and displays a solder supply button 101a (see FIG. 3) for the user to instruct the printing apparatus 100 to supply solder regardless of the set supply interval. It is configured. The user can cause the printing apparatus 100 to supply solder by pressing the solder supply button 101a.

  FIG. 8 is a flowchart for explaining the printing operation of the printing apparatus according to the first embodiment. Next, a printing operation of the printing apparatus 100 according to the first embodiment will be described with reference to FIGS. 2, 3, and 8. In the following description, printing performed by moving the printing unit 7 in the arrow Y2 direction and the arrow Y1 direction will be referred to as forward printing and backward printing, respectively.

  At the time of printing, first, in step S1, preparation for starting printing is performed. Specifically, the control unit 9 calls the board data of the printed circuit board 200 to be printed from the storage unit 9a (see FIG. 3). In addition, the user operates the external regulator 760 to adjust the pressure regulation level of the regulator 750 so that the pressure regulation level corresponds to the size of the printed circuit board 200. That is, in the case of printing a large printed circuit board 200 using the mask 300 having a large total opening area, the degree of pressure reduction is made small so that the pressure of the air passage A2 becomes high. In the case of printing on a small printed circuit board 200 using a mask 300 having a small total area of openings, the pressure is greatly reduced. Thereafter, the printing operation is started.

  Next, in step S <b> 2, the printed circuit board 200 to be printed is carried from the conveyor 4 a to the conveyor 55 of the substrate positioning lifting device 5. Then, the printed board 200 is lifted by the board positioning lift 5 and moved to the printing position P (see FIG. 2). Specifically, the side surface of the printed circuit board 200 is clamped by the clamp pieces 57a and 57b, and the printed circuit board 200 on the conveyor 55 is raised by the lifting table 56 (see FIG. 2). Thereafter, the Z-axis table 54 is raised, so that the printed circuit board 200 is moved to the printing position P in contact with the lower surface of the mask 300.

  Next, in step S3, the control unit 9 determines whether or not the printing to be performed is a backward printing. If the printing to be performed is not return printing (in the case of forward printing), the supply of solder is not performed and the process proceeds to step S9. If the printing to be performed is return pass printing, it is determined in step S4 whether or not the number of prints has reached a preset set number (supply interval). When the number of printed sheets reaches a preset number, it is necessary to supply solder, and the process proceeds to step S6. If the number of prints has not reached the preset number, it is determined in step S5 whether or not soldering has been instructed by the user. Specifically, it is determined whether or not the solder supply button 101a is pressed on the display unit 101. If solder supply is not instructed by the user, the process proceeds to step S9 without supplying solder. If soldering is instructed by the user, the soldering is performed and the process proceeds to step S6.

  In step S6, solder is supplied. The specific operation of supplying solder will be described in detail later.

  Next, in step S <b> 7, it is determined whether or not the solder 721 is sufficiently contained in the syringe 721. Specifically, it is determined whether the amount of solder is sufficient based on the detection result of the capacitance type sensor 725. If the amount of solder in the syringe 721 is sufficient, the process proceeds to step S9. If the amount of solder in the syringe 721 is not sufficient, in step S8, the display unit 101 displays a content indicating that the remaining amount of solder is low and warns. Even when it is determined that the amount of solder in the syringe 721 is not sufficient, the remaining amount for printing a plurality of printed circuit boards 200 is secured. Thereafter, the process proceeds to step S9.

  Next, in step S9, forward pass printing or return pass printing is executed. Specifically, the squeegee 711 is lowered by driving the servo motor 712b, and a predetermined printing pressure load is further applied. In this state, printing is performed by moving the printing unit 7 in the Y direction by driving the servo motor 83. At this time, since the solder pressing surface 711a of the squeegee 711 moves while sliding on the upper surface of the opening region 301 of the mask 300, the solder is pressed against the solder pressing surface 711a of the squeegee 711 from the rear side, and the squeegee 711 moves. Move. As the squeegee 711 moves, the solder is pushed out onto the printed circuit board 200 through the opening of the mask 300. As a result, solder is printed on the printed circuit board 200 in contact with the lower surface of the mask 300 corresponding to the pattern of the opening of the mask 300. When printing is finished, the Y-direction movement of the printing unit 7 is stopped, the squeegee 711 is raised by driving the servo motor 712b, and the squeegee 711 is rotated by changing the tilt angle by driving the servo motor 713a. 7 is further moved from the print end position by a predetermined amount in the Y direction and stopped.

  Next, in step S10, the printed board 200 (see FIG. 5) after printing is lowered by the board positioning lift 5 and the printed board 200 after printing is carried out from the board positioning lift 5 via the conveyor 4b. The

  Next, in step S11, the control unit 9 determines whether or not the remaining solder amount is being warned. That is, it is determined in step S8 whether or not a warning is displayed on the display unit 101. If a warning is displayed, it is determined in step S12 whether or not the solder supply unit 72 has supplied solder for a specified time. In other words, even when the remaining amount warning is given, an amount capable of printing a predetermined number of printed circuit boards 200 remains in the syringe 721, so it is determined whether or not the number has been printed. Since the supply time of one solder supply (the time for opening the electromagnetic valve 742a) is determined by the size of the printed circuit board 200 and the total area of the opening of the mask 300 corresponding to the size, the predetermined number of printed circuit boards 200 are printed. Based on the number of times of supplying the solder and the time for supplying one solder, the total solder supply time after the remaining amount warning is calculated is calculated. By comparing the total of the solder supply times with the designated time, it is determined whether or not the solder for the designated time has been supplied. When the solder for the designated time is supplied, since no solder remains in the syringe 721, the printing operation is stopped (error stop). If the solder for the specified time is not supplied, the next printed circuit board 200 can be printed, and the process proceeds to step S13.

  In step S13, it is determined whether there is a printed board 200 to be printed next. If there is a printed circuit board 200 to be printed, the process returns to step S2, and the printing of solder is performed by repeating steps S2 to S13.

  FIG. 9 is a flowchart for explaining the solder supply operation of the printing apparatus according to the first embodiment. Next, the solder supply operation of the printing apparatus 100 according to the first embodiment will be described with reference to FIG.

  When supplying the solder, first, in step S21, the control unit 9 moves the discharge stop member 726 from the standby position to the retracted position. Specifically, the control unit 9 supplies air to the cylinder unit 727 by bringing the electromagnetic valve 742b into the third state in which the air passage B is connected to the air source 741 and the air passage C is opened to the atmosphere. Thereby, since the piston 727a in the cylinder unit 727 is moved in the arrow X2 direction, the discharge stop member 726 fixed to the piston 727a is also moved in the arrow X2 direction. Then, when the piston 727a moves to the end portion in the direction of the arrow X2, the discharge stop member 726 is moved to the retracted position. As a result, the supply port 721a closed by the closing member 726a is opened, so that solder can be supplied onto the mask 300 from the supply port 721a.

  Next, in step S22, the control unit 9 opens the electromagnetic valve 742a. As a result, the pressure adjusted according to the total area of the opening of the mask 300 by the regulator 750 whose pressure adjustment level is adjusted by the user operating the external regulator 760 is supplied to the syringe 721. Thereby, the pressure in the syringe 721 becomes the same as the pressure of the air passage A2 regulated by the regulator 750. Since the piston 721b is pushed downward by the pressure of the air, the solder accommodated below the piston 721b is pushed out from the supply port 721a.

  In step S23, it is determined whether or not a predetermined supply amount of solder has been supplied. Specifically, the control unit 9 calculates the position of the piston 721b based on the detection result of the sensor 721c, and calculates the moving distance of the piston 721b from the time when the supply of solder is started. Then, the amount of solder supplied is calculated from the moving distance of the piston 721b and the cross-sectional area of the piston 721b. By comparing the calculated amount of solder with the data value of the board data, it is determined whether or not an amount of solder corresponding to a preset size of the printed board 200 has been supplied. If a preset amount of solder is not supplied, this determination is repeated until the amount is supplied.

  When the preset supply amount of solder is supplied, in step S24, the control unit 9 changes the electromagnetic valve 742a from the first state to the second state. As a result, the air in the syringe 721 is released to the atmosphere via the air passage A2, the check valve 751, and the air passage A1, and then escapes. Thus, the pressure in the syringe 721 is lowered, and the supply of solder is finished. On the other hand, the quick exhaust valve 770 is opened in conjunction with the electromagnetic valve 742a being changed from the first state to the second state, whereby the air in the syringe 721 is released to the atmosphere via the quick exhaust valve 770. As a result, the pressure of the air in the syringe 721 drops rapidly, so that the piston 721b is pushed down by the pressure remaining in the syringe 721 even after the electromagnetic valve 742a is brought into the second state in order to end the supply of solder, and soldering is performed. Can be prevented from being supplied excessively.

  Then, after the supply of the solder is completed, in step S25, the control unit 9 moves the discharge stop member 726 from the retracted position to the standby position. Specifically, the control unit 9 supplies air to the cylinder unit 727 by setting the electromagnetic valve 742b to a fourth state in which the air passage B is opened to the atmosphere and the air passage C is connected to the air source 741. Thereby, since the piston 727a in the cylinder unit 727 is moved in the direction of the arrow X1, the discharge stop member 726 fixed to the piston 727a is also moved in the direction of the arrow X1. When the discharge stop member 726 moves in the direction of the arrow X1, the solder hanging from the supply port 721a after the supply of the solder is terminated is cut by the wire 726b and dropped onto the mask 300. Then, the piston 727a moves to the end in the arrow X1 direction as it is, so that the discharge stop member 726 is moved to the standby position. As a result, the closing member 726a of the discharge stop member 726 is positioned below the supply port 721a, thereby closing the supply port 721a. In the first embodiment, the solder is supplied in this way.

  In the first embodiment, as described above, the amount of solder supplied from the solder supply unit 72 is adjusted according to the total area of the openings of the mask 300 used for printing of the printed circuit board 200, thereby increasing the size of the large printed circuit board 200. Is printed, the amount of solder to be supplied is increased so as to correspond to the increase in the total area of the opening of the mask 300, and when the small printed circuit board 200 is printed, the total area of the opening of the mask 300 Therefore, it is possible to reduce the amount of solder to be supplied so as to cope with the decrease in size. Thereby, since the amount of solder on the mask 300 can be kept constant when printing a large printed circuit board 200 and when printing a small printed circuit board 200, the print quality of solder on the large printed circuit board 200 and small prints can be maintained. It can suppress that the printing quality of the solder with respect to the board | substrate 200 differs.

  In the first embodiment, as described above, the pressure of the air from the air source 741 is adjusted in the air passage A between the air source 741 and the syringe 721 in accordance with the total area of the opening of the mask 300. By providing the regulator 750 capable of printing, when printing a large printed circuit board 200, the pressure of air supplied to the syringe 721 can be increased by the regulator 750, so that the amount of solder supplied per unit time can be reduced. The amount of solder can be increased, and a large amount of solder can be supplied in a short time. Further, when printing a small printed circuit board 200, the pressure of air supplied to the syringe 721 can be reduced by the regulator 750, so that the amount of solder supplied per unit time can be reduced. Thereby, when supplying a small amount of solder for printing the small printed circuit board 200, the small amount of solder can be supplied over a relatively long time. Thereby, unlike a case where a small amount of solder is supplied in a short time, it is possible to suppress a deviation between a necessary supply amount and an actually supplied amount. That is, since the viscosity of the solder is relatively high, even when air is supplied to the syringe 721, the supply amount varies due to the viscosity. Since it is possible to suppress the variation in the supply amount by supplying the solder over a relatively long time, it is possible to suppress the deviation between the necessary supply amount and the actually supplied amount.

  In the first embodiment, as described above, the air source is provided by providing the external regulator 760 that is provided at a position where the user can operate and can adjust the pressure regulation level of the regulator 750. Even when it is difficult for the user to directly operate the regulator 750 due to the provision of the regulator 750 in the air passage A between the cylinder 741 and the syringe 721, the regulator can be operated by operating the external regulator 760. 750 pressure regulation levels can be adjusted. Thereby, the user can easily adjust the pressure of the air from the air source 741 corresponding to the total area of the opening of the mask 300.

  In the first embodiment, as described above, the amount of solder supplied from the supply port 721a is calculated based on the remaining amount of solder in the syringe 721 calculated based on the detection result of the sensor 721c. When the calculated supply amount becomes equal to or larger than a set value corresponding to the total area of the openings of the mask 300, the electromagnetic valve 742a is changed from the open state to the open state, so that the electromagnetic supply is made when the solder supply amount becomes the set value. Since the supply of solder can be terminated by opening the valve 742a, the amount of solder corresponding to the total area of the opening of the mask 300 can be accurately supplied.

  Further, in the first embodiment, as described above, by providing the quick exhaust valve 770 that releases the pressure inside the syringe 721 to the atmosphere when the electromagnetic valve 742a is changed from the first state to the second state, soldering is performed. When the electromagnetic valve 742a is set to the second state in order to end the supply of the solder, it is possible to suppress the excessive supply of solder due to the pressure inside the syringe 721 remaining. . As a result, the amount of solder corresponding to the total area of the openings of the mask 300 can be supplied more accurately.

  In the first embodiment, as described above, when the discharge stop member 726 that can move in the vicinity of the lower portion of the supply port 721a is provided and the electromagnetic valve 742a changes from the first state to the second state, the supply port The solder suspended from 721a is cut by the wire 726b, and the discharge stop member 726 is moved so as to close the supply port 721a by the closing member 726a. Thus, when the electromagnetic valve 742a is set to the second state in order to end the supply of the solder, by moving the discharge stop member 726, not only the solder hanging from the supply port 721a by the wire 726b is cut, The supply port 721a can be closed by the closing member 726a.

(Second Embodiment)
FIG. 10 is a fluid circuit diagram of the printing apparatus according to the second embodiment of the present invention. Referring to FIG. 10, in the second embodiment, unlike the first embodiment in which the user adjusts the air pressure at the time of supplying solder, the air pressure at the time of supplying solder is automatically adjusted by the control of control unit 9. An example will be described.

  In the printing apparatus 600 according to the second embodiment, a regulator 780 including a so-called electropneumatic regulator capable of electrically controlling the air pressure is provided instead of the regulator 750 and the external regulator 760 of the first embodiment. The board data of the printed circuit board 200 to be printed includes air pressure data corresponding to the size of the printed circuit board 200 at the time of supplying the solder. The controller 9 is configured to be able to change the pressure regulation level of the regulator 780 based on the substrate data. The configuration of the printing apparatus 600 according to the second embodiment other than the above-described configuration is the same as that of the first embodiment.

  FIG. 11 is a flowchart for explaining the solder supply operation of the printing apparatus according to the second embodiment. Next, a solder supply operation of the printing apparatus 600 according to the second embodiment will be described with reference to FIG. Note that the printing operation of the printing apparatus 600 according to the second embodiment is the same as that of the first embodiment except that the user does not perform pressure adjustment in step S1 of FIG.

  In the solder supply operation of the printing apparatus 600 according to the second embodiment, first, in step S31, the control unit 9 determines the pressure regulation level corresponding to the size of the printed circuit board 200 based on the substrate data of the printed circuit board 200 to be printed. The pressure regulation level of the regulator 780 is adjusted so that Thereafter, in steps S32 to S36, operations similar to those in steps S21 to S25 of the first embodiment are performed.

  In the second embodiment, as described above, by using the regulator 780 that can be electrically controlled, by changing the pressure regulation level at the time of supplying solder based on the board data, the user can automatically operate without operating the regulator. In particular, air having a pressure corresponding to the total area of the openings of the mask 300 can be supplied to the syringe 721. As a result, it is possible to prevent a printing defect from occurring due to the user operating the regulator incorrectly.

  Other effects of the second embodiment are the same as those of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first embodiment and the second embodiment, the example in which the electromagnetic valve 742a is set to the second state based on the supplied solder amount calculated based on the detection result of the sensor 721c has been described. Not limited to this, the electromagnetic valve 742a may be set to the second state after a predetermined time has elapsed after the electromagnetic valve 742a is set to the first state and the supply of solder is started. In this case, it is determined whether or not a predetermined time has elapsed in step S23 of FIG. 9 or step S34 of FIG. With this configuration, it is possible to easily supply solder without providing the sensor 721c.

  In the first embodiment and the second embodiment, the supply of solder corresponds to the total area of the opening of the mask 300 used for printing on the printed circuit board 200 to be printed by changing the air pressure supplied to the syringe 721. Although an example in which the amount is changed is shown, the present invention is not limited to this, and the amount of solder supply may be changed by changing the solder supply time corresponding to the total area of the openings of the mask 300. Further, the supply amount of solder may be changed by changing the size of the supply port 721a of the syringe 721 corresponding to the total area of the opening of the mask 300.

  Moreover, in the said 1st Embodiment and 2nd Embodiment, the syringe 721 of the solder supply part 72 does not move to a X direction (direction orthogonal to a printing direction), but the example which supplies solder by the point of a X direction is shown. However, the present invention is not limited thereto, and the syringe of the solder supply unit may be configured to be movable in the X direction, and may be configured to supply the solder while moving the syringe in the X direction. As a result, so-called drawing supply can be performed.

  In the first embodiment and the second embodiment, the supply port 721a is arranged at a predetermined interval in the arrow Y1 direction from the approximate center portion of the squeegee 711 in the X direction. The supply port 721a is not limited to the substantially central portion in the X direction of the squeegee 711, and the supply port 721a may be an arrow Y1 from any portion as long as it is included in an intermediate region between both ends of the squeegee 711 in the X direction. You may arrange | position at predetermined intervals in the direction.

  In the first embodiment and the second embodiment, the example in which the solder is supplied for each reciprocal printing is shown. However, the present invention is not limited to this, and the solder is supplied every 2 reciprocations or every 3 reciprocations. May be.

  Moreover, in the said 1st Embodiment and 2nd Embodiment, although the example which used air as "gas" of this invention was shown, this invention is not restricted to this, You may use gas other than air.

  Further, the electromagnetic valves 742a and 742b in the first embodiment and the second embodiment may be configured by a 3-port switching valve, a 4-port switching valve, or a combination of a plurality of on-off valves. .

  In the first and second embodiments, the electromagnetic valve 742a is disposed in the air passage between the air source 741 and the regulator 750 as the “switching means” and “valve mechanism” of the present invention. A valve mechanism may be disposed in the air passage between 721. In this case, the check valve 751 can be eliminated, and only the electromagnetic valve 742a as an example of the valve mechanism is an example of the “switching means” of the present invention. At the time of switching from the first state to the second state and from the second state to the first state, the pressure in the syringe 721 can be changed quickly, so that the response of supply start and stop can be improved. Also in this case, an example using air is shown, but the present invention is not limited to this, and a gas other than air may be used.

1 is a perspective view showing a printing apparatus according to a first embodiment of the present invention. It is a side view which shows the printing apparatus by 1st Embodiment shown in FIG. It is a block diagram which shows the structure of the printing apparatus by 1st Embodiment shown in FIG. It is a perspective view for demonstrating the structure of the solder supply part of the printing apparatus by 1st Embodiment shown in FIG. It is a perspective view for demonstrating the structure of the solder supply part of the printing apparatus by 1st Embodiment shown in FIG. It is sectional drawing for demonstrating the structure of the solder supply part of the printing apparatus by 1st Embodiment shown in FIG. FIG. 2 is a fluid circuit diagram of the printing apparatus according to the first embodiment shown in FIG. 1. 3 is a flowchart for explaining a printing operation of the printing apparatus according to the first embodiment shown in FIG. 1. 2 is a flowchart for explaining a solder supply operation of the printing apparatus according to the first embodiment shown in FIG. 1. It is a fluid circuit diagram of the printing apparatus by 2nd Embodiment of this invention. It is a flowchart for demonstrating the solder supply operation | movement of the printing apparatus by 2nd Embodiment shown in FIG.

Explanation of symbols

9 Control Unit 72 Solder Supply Unit 100 Printing Device 300 Mask 721c Sensor (Remaining Amount Detection Unit)
721 Syringe (solder housing part)
726 Discharge stop member 726a Closure member 726b Wire (cutting member)
741 Air source 742a Solenoid valve (valve mechanism, switching means)
750 Regulator (solder supply adjustment unit, first pressure adjustment unit)
760 External regulator (second pressure regulator)
770 Quick exhaust valve (exhaust device)
780 Regulator (solder supply adjustment unit, first pressure adjustment unit)

Claims (8)

A solder supply unit for supplying solder to an upper surface of a mask disposed on a substrate and having an opening of a predetermined pattern corresponding to the substrate;
A printing apparatus comprising: a solder supply adjusting unit configured to adjust the amount of solder supplied from the solder supply unit corresponding to the total area of the opening of the mask. The solder supply unit
A solder containing portion having a supply port for discharging the contained solder, and containing the solder inside;
A gas source for supplying a gas having a predetermined pressure to the solder accommodating portion;
Switching means that is provided in a gas passage between the gas source and the solder accommodating portion, and switches the pressure of the solder accommodating portion between a pressurized state based on a gas supplied from the gas source and an atmospheric pressure state;
The solder supply adjusting unit is provided in a gas passage between the gas source and the solder accommodating unit, and the pressure of the gas from the gas source is applied to the solder accommodating unit corresponding to the total area of the opening of the mask. The printing apparatus according to claim 1, wherein the printing apparatus is configured to include a first pressure adjustment unit capable of adjusting a pressure of a supplied gas.   The printing apparatus according to claim 2, further comprising a second pressure adjustment unit that is provided at a position where the user can operate and can adjust the adjustment pressure of the first pressure adjustment unit. A control unit that controls at least the driving of the solder supply unit;
The solder supply unit further includes a remaining amount detection unit that detects a remaining amount of solder accommodated in the solder accommodation unit,
The control unit holds a set value of the supply amount of solder set corresponding to the total area of the opening of the mask,
The control unit calculates a supply amount of solder supplied from the supply port based on the remaining amount of solder in the solder housing unit detected by the remaining amount detection unit, and the calculated supply amount is the set value. 4. The printing apparatus according to claim 2, wherein the switching unit is configured to control the pressure of the solder housing portion to be in an atmospheric pressure state when the temperature becomes as described above. A control unit that controls at least the driving of the solder supply unit;
When supplying solder to the upper surface of the mask, the control unit controls the switching unit so that the pressure of the solder accommodating unit is in a pressurized state for a time corresponding to the total area of the opening of the mask. The printing apparatus according to claim 2, wherein the printing apparatus is configured.   The switching means includes a first state in which the gas source side communicates with the solder accommodating portion side with the switching means as a boundary in the gas passage, and the gas source side with the switching means in the gas passage as a boundary. And a valve mechanism for switching to a second state in which the solder accommodating portion side is opened to the atmosphere with the switching means of the gas passage as a boundary. The printing apparatus according to item 1.   The solder supply unit is provided in the gas passage closer to the solder accommodating unit than the valve mechanism, and when the valve mechanism is switched from the first state to the second state, The printing apparatus according to claim 6, further comprising an exhaust device that releases internal pressure to the atmosphere. A control unit that controls at least the driving of the solder supply unit;
The solder supply unit further includes a discharge stop member that is movable in the vicinity below the supply port,
The discharge stop member has a cutting member for cutting the solder hanging from the supply port, and a closing member for closing the supply port,
The control unit cuts the solder suspended from the supply port by the cutting member and supplies the supply by the closing member when the switching unit is switched so that the pressure of the solder accommodating unit is changed to an atmospheric pressure state. The printing apparatus according to claim 2, wherein the discharge stop member is controlled to move the discharge stop member so as to close the mouth.

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