JP2009119820A - Screen printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of a defect in printing caused by the sticking of a cover body in a cartridge. <P>SOLUTION: A cartridge 73 for soldering paste feeding composed of an extrusion vessel 81 and a cover body 82 is made freely attachable/detachable. A squeegee head 42 is provided with an air cylinder 66 pressing the cover body 83 and a squeegee 6 applying soldering paste 72 in a soldering paste room 75 to a mask plate 6. The printer is equipped with a lifting device lifting/lowering the squeegee head 42 and a moving device moving the squeegee head 42 along the mask plate 6 to the horizontal direction. The printer is equipped with a sticking detection device detecting the sticking of the cover body 82 to the extrusion vessel 81 and an informing device, when the sticking is detected, informing an operator of the fact in the mounted cartridge 73. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a screen printer used for applying a solder paste to a printed wiring board by printing.

  As a conventional screen printing machine of this type, for example, there is one described in Patent Document 1. The screen printer disclosed in Patent Document 1 prints a solder paste on a portion to be soldered on a printed wiring board by applying the solder paste to the mask plate superimposed on the printed wiring board with a squeegee. Is. The screen printing machine includes a squeegee head in which the squeegee is provided at a lower end, a lifting device for moving the squeegee head up and down, a moving device for moving the squeegee head in a horizontal direction, and the like. .

In the squeegee head, a solder paste chamber is formed so as to be positioned in the vicinity of the upper portion of the squeegee, and a cartridge mounting portion is formed so as to be positioned on the solder paste chamber. A solder paste supply cartridge is detachably mounted on the cartridge mounting portion.
The cartridge includes a bottomed cylindrical extrusion container that opens upward, and a lid that closes the opening of the extrusion container, and contains a solder paste therein.

  The extrusion container is composed of a cylindrical wall whose upper end is the opening, and a bottom plate integrally formed at the lower end of the cylindrical wall by integral molding. The bottom plate has a large number of through holes through which the solder paste passes. The lid is slidably inserted into the opening portion of the cylindrical wall, and is pressed toward the bottom plate by a cylinder provided in the squeegee head. When the lid is pressed toward the bottom plate, the solder paste in the cartridge is supplied to the lower solder paste chamber through the through hole.

  A solder inlet through which the solder paste discharged from the cartridge passes is formed at the upper end portion of the solder paste chamber, and a solder outlet opening downward is formed at the lower end portion of the solder paste chamber. This solder outlet is covered with a mask plate during screen printing. Plate-like squeegees are provided on both sides of the solder outlet, that is, on the front side and the rear side where the squeegee head moves during screen printing.

When the cylinder presses the lid while the solder paste chamber is filled with the solder paste, the pressing force is transmitted to the solder paste in the solder paste chamber via the solder paste in the cartridge. The paste is supplied from the solder outlet to the mask plate side.
JP 2006-168028 A

  In the conventional screen printing machine configured as described above, there is a possibility that the lid of the solder paste supply cartridge is fixed to the extrusion container. The lid is fixed to the extrusion container in this way because the solder paste is made by mixing the solder fine particles and the activator, so that the volatile components constituting the activator volatilize during long-term use and storage of the cartridge, This is because the viscosity is increased and the solder paste is solidified in the gap between the lid and the extrusion container, and the movement of the lid is restricted.

  When the lid is fixed to the cylinder wall, the lid cannot be moved even when pressed by the cylinder, so that the solder paste cannot be supplied from the cartridge to the solder paste chamber. In conventional screen printing machines, when the lid is fixed to the cylinder wall, such as by using the cartridge for a long time from the start of use, printing is performed in a state where the solder paste is insufficient, and printing failure occurs. there were.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a screen printing machine capable of preventing the occurrence of printing failure due to the fixing of the lid of the cartridge.

  In order to achieve this object, a screen printing machine according to the present invention comprises a bottomed cylindrical extrusion container in which solder paste is stored and an extrusion lid, and the lid is pushed into the extrusion container. The solder paste supply cartridge from which the solder paste comes out from the bottom of the extrusion container is made detachable, a pressurizing device that presses the lid toward the bottom of the extrusion container, and the supply from the cartridge and stored in the solder paste chamber A squeegee for applying the solder paste applied to the screen printing mask plate is provided on the squeegee head, and an elevating device for raising and lowering the squeegee head between a printing position and a retracted position above the mask plate; and A moving device that moves horizontally along the mask plate and a control device that controls the operation of these devices. In the obtained screen printing machine, a sticking detection device that detects sticking of the lid to the push-out container in the mounted solder paste supply cartridge, and a notification device that notifies an operator when sticking is detected. It is to be prepared.

  In the present invention, in addition to the notification device, the present invention includes a notification unit that stops the screen printing operation when sticking is detected.

  According to the present invention, in the above invention, the sticking detection device includes a load detector that detects a magnitude of a reaction force generated when the squeegee presses the mask plate, and the control device. In the state in which the squeegee head is lowered by the elevating control unit, the elevating control unit that lowers the squeegee head by the elevating device so that the load detected by the load detector reaches a predetermined initial value. A pressure control unit that presses the lid with a predetermined pressure by a pressure device; and a load detection value and an initial value detected by the load detector after the pressure device is operated by the control of the pressure control unit. And an arithmetic processing unit that determines whether or not there is sticking.

  According to the present invention, in the above invention, the arithmetic processing unit is not fixed when a difference between the load detection value and the initial value is larger than a predetermined determination value, and when the difference is smaller than a predetermined determination value. Indicates that there is sticking.

  According to the present invention, in the invention, the sticking detection device includes a pressure sensor that detects a pressure of the solder paste in the solder paste chamber and the control device, and the control device is a load detected by the load detector. Elevating control unit for lowering the squeegee head by the elevating device such that the squeegee head is lowered by the control of the elevating control unit. A pressure control unit that presses with the pressure of the pressure, and an arithmetic processing unit that determines whether or not there is a sticking based on a pressure detection value detected by the pressure sensor after the pressurization device is operated by the control of the pressure control unit. Is provided.

  According to the present invention, in the invention described above, the arithmetic processing unit determines that there is no sticking when the pressure detection value is larger than a predetermined determination value, and there is sticking when the pressure detection value is smaller than a predetermined determination value. To do.

According to the present invention, when the lid of the cartridge is fixed to the extrusion container, the sticking detection device detects this and the notification device operates, so that the operator can be prompted to replace the cartridge. Therefore, according to the present invention, it is possible to provide a screen printer capable of preventing a printing defect from occurring due to the fixing of the lid of the cartridge.
According to the invention including the notifying unit that stops the screen printing operation when the sticking is detected, it is possible to reliably prevent the occurrence of printing failure due to the sticking of the lid of the cartridge.

  In the screen printing machine according to the present invention, in a normal state in which the lid of the cartridge is not fixed, the pressurizing device presses the lid to discharge the solder paste from the inside of the cartridge and supply it to the solder paste chamber. The At this time, if the solder paste chamber is filled with the solder paste and the squeegee is pressed against the mask plate, the solder paste in the cartridge and the solder paste chamber is pressed by the pressing device. Pressure increases. Thus, when the pressure of the solder paste in the solder paste chamber increases, the squeegee head is biased upward by this pressure.

  On the other hand, if the lid of the cartridge is fixed to the extrusion container or is not completely fixed but is difficult to move with respect to the extrusion container, the soldering device will not be soldered even if the pressure device presses the cover. The pressure of the solder paste in the paste chamber does not change or even increases slightly if it changes. In a state where the cartridge lid is completely fixed to the extrusion container, the squeegee head is not biased upward by the pressure.

  Therefore, according to the invention including the load detector that detects the magnitude of the reaction force generated when the squeegee presses the mask plate, it is possible to determine whether or not the lid is fixed using the above-described phenomenon. In this invention, since the pressing force when the pressurizing device presses the lid of the cartridge is predetermined, the condition for determining the presence or absence of the sticking is always constant even when the cartridge is replaced. . Therefore, according to the present invention, it can be accurately determined whether or not the lid of the cartridge is fixed to the extrusion container.

  The load detector used when implementing the present invention can also be used to detect a load when pressing the squeegee head against the mask plate, in other words, a printing load. For this reason, according to the present invention, it is possible to detect the printing load and the presence / absence of fixation with a single load detector, and therefore, a sensor for detecting the presence / absence of fixation of the lid is exclusively used. Compared to the case, it is possible to provide a screen printer with a low manufacturing cost.

  According to the invention in which the difference between the load detection value detected by the load detector and the initial value is compared with a predetermined determination value to determine the presence or absence of fixation, it is determined whether or not the lid is fixed to the extrusion container. Since it is possible to make the standard when doing so, it is possible to more accurately determine the presence or absence of the sticking.

  According to the invention including the pressure sensor for detecting the pressure of the solder paste in the solder paste chamber, the pressure in the solder paste chamber increases due to the pressing of the pressure device when the cartridge lid is not fixed to the extrusion container. The pressure value detected by the pressure sensor increases. On the other hand, if the lid is fixed to the extrusion container or is not completely fixed but difficult to move with respect to the extrusion container, the solder in the solder paste chamber will not be moved even if the pressure device presses the lid. The pressure of the paste does not change, or even if it changes, the pressure value detected by the pressure sensor does not change or changes before and after the pressing device presses the lid. If it does, it will only increase slightly.

Therefore, according to the present invention, it is possible to determine whether or not the lid is fixed based on the pressure of the solder paste detected by the pressure sensor.
In particular, according to the present invention, since the pressure of the solder paste in the solder paste chamber is detected by the pressure sensor, it is possible to directly detect whether or not the solder paste is discharged from the cartridge. It is possible to detect the presence or absence of sticking with high accuracy.

  According to the invention in which the pressure detection value detected by the pressure sensor is compared with a predetermined determination value to determine the presence or absence of fixation, the reference for determining whether or not the lid is fixed to the extrusion container is constant. Therefore, the presence / absence of the sticking can be determined more accurately.

(First embodiment)
Hereinafter, an embodiment of the screen printing machine according to the present invention will be described in detail with reference to FIGS.
FIG. 1 is a front view of a screen printing machine according to the present invention, FIG. 2 is a cross-sectional view showing a configuration of a main part, FIG. 3 is a perspective view showing a configuration of a lifting device, and FIG. 4 is a configuration of a lower end portion of a squeegee head. FIG. 5 is a block diagram showing the configuration of the screen printing machine according to the present invention.
6 to 9 are flowcharts for explaining the operation of the screen printing machine according to the present invention. FIG. 6 shows the entire operation of the printing process, and FIG. 7 shows the operation when checking the presence or absence of the fixed state. FIG. 8 shows the operation when the fixed state is broken, and FIG. 9 shows the operation during printing.

  In these drawings, what is denoted by reference numeral 1 is a screen printing machine according to this embodiment. As shown in FIG. 1, the screen printing machine 1 is provided on a base 2 and an end of the base 2 in the left-right direction in FIG. 1 (hereinafter, this direction is simply referred to as X direction). The carry-in conveyor 3 and the carry-out conveyor 4, a printing stage 5 provided on the base 2 so as to be positioned between the two conveyors 3, 4, and extending substantially horizontally above the printing stage 5 And a squeegee unit 7 positioned above the mask plate 6.

  The carry-in conveyor 3 and the carry-out conveyor 4 are configured to convey the printed wiring board 8 from the right side to the left side in FIG. The carry-in conveyor 3 conveys the printed wiring board 8 carried out from an apparatus (not shown) that performs a pre-process for screen printing to the main conveyor 11 of the printing stage 5 described later. The unloading conveyor 4 unloads the printed wiring board 8 on which the solder paste screen printing has been completed on the printing stage 5 to an apparatus (not shown) in a subsequent process.

  The printing stage 5 has a fixed table 12 fixed on the base 2 and a Y that moves on the fixed table 12 in the front-rear direction perpendicular to the plane of FIG. The axis table 13, the X axis table 14 that moves in the X direction on the Y axis table 13, and the vertical axis on the X axis table 14 (hereinafter, this direction is simply referred to as the Z direction). A moving R-axis table 15, a lifting table 16 that moves up and down on the R-axis table 15, the main conveyor 11, a pin unit 17, a clamp unit 18, and the like provided on the lifting table 16 are provided.

As shown in FIG. 1, the main conveyor 11 carries in the printed wiring board 8 from the carry-in conveyor 4 while being positioned at the same height as the carry-in and carry-out conveyors 3 and 4, or carries out the carry-out conveyor. 4 to carry out the printed wiring board 8.
The said pin unit 17 supports the printed wiring board 8 conveyed on the main conveyor 11 from the downward direction with many pins 17a.

The clamp unit 18 clamps the printed wiring board 8 supported by the pin unit 17 so as not to move with respect to the lifting table 16.
The Y-axis table 13 and the X-axis table 14 move the printed wiring board 8 fixed to the lifting table 16 by the clamp unit 18 to a predetermined position below the mask plate 6. The Y-axis table 13 is driven by a ball screw unit 19 on the fixed table 12, and the X-axis table 14 is driven by a ball screw unit 20 on the Y-axis table 13. The R-axis table 15 is rotated by a rotation unit 21 provided on the Y-axis table 13.

The lifting table 16 is for overlapping the printed wiring board 8 on the mask plate 6 from below, and is driven by a ball screw unit 22 on the R-axis table 15.
The position of the printed wiring board 8 with respect to the mask plate 6 in the X direction, the Y direction, and the angle around the axis in the Z direction is detected by imaging the printed wiring board 8 from above with the board imaging camera 23, and the Y axis table 13, The X-axis table 14 and the R-axis table 15 are moved so as to coincide with the mask plate 6.
The mask plate 6 is formed in a thin plate shape, and both ends in the X direction are supported by the base 2 as shown in FIG. The position of the mask plate 6 with respect to the base 2 is detected by imaging the mask plate 6 with a mask imaging camera 24 (see FIG. 5).

  The printed wiring board 8 is aligned with the mask plate 6 so that the alignment mark imaged by the board imaging camera 23 coincides with the alignment mark of the mask plate 6 imaged by the mask imaging camera 24. This is performed by controlling the position of the table 16.

  As shown in FIG. 1, the squeegee unit 7 is attached to a horizontal frame 31 that extends in the X direction above the base 2. The horizontal frame 31 is supported so as to be movable in the Y direction on rails 34a (see FIG. 2) attached to a Y direction frame member 34 supported on a base on both sides in the X direction. The horizontal frame 31 is driven by a ball screw unit 33 having a ball screw shaft 32 extending in the Y direction, as shown in FIG. The ball screw shaft 32 is rotatably supported by the Y direction frame member 34. A head Y-axis motor 35 is connected to one end of the ball screw shaft 32. A ball screw nut 36 to which the ball screw shaft 32 is screwed is attached to the horizontal frame 31.

  When the horizontal frame 31 is moved in the Y direction by driving by the ball screw unit 33, the squeegee unit 7 supported by the horizontal frame 31 is moved in the Y direction along the mask plate 6. In this embodiment, the horizontal frame 31 and the ball screw unit 33 constitute a moving device 37 referred to in the present invention.

2 to 4, the squeegee unit 7 includes a main body frame 41 attached to the horizontal frame 31, a squeegee head 42 supported by the main body frame 41 so as to be movable up and down, and the squeegee head 42 as a main body. It is comprised by the raising / lowering apparatus 43 (refer FIG. 3) etc. which raise / lower with respect to the flame | frame 41. FIG.
As shown in FIG. 3, the main body frame 41 is formed in a plate shape extending in the X direction and the Z direction. First compression coil springs 44 are provided upright at both lower ends of the main body frame 41 in the X direction to support the weight of a squeegee head 42 described later. These first compression coil springs 44 are attached to a mounting seat 45 projecting from the lower end of the main body frame 41 so as to extend upward therefrom.

A pair of first guide rails 46 for supporting the squeegee head 42 movably in the Z direction is attached between the first compression coil springs 44, 44 in the main body frame 41. A support plate 48 of the squeegee head 42 is supported on the first guide rails 46 and 46 through a plurality of sliders 47 so as to be movable in the Z direction. A pressure receiving member 49 placed on the first compression coil spring 44 is attached to both ends of the support plate 48 in the X direction. By placing the pressure receiving member 49 on the first compression coil spring 44, the entire weight of the squeegee head 42 having the support plate 48 is supported by the first compression coil spring 44.
Between the pair of first guide rails 46, 46 in the main body frame 41, a second guide rail 52 for supporting a lifting member 51 of a lifting device 43, which will be described later, movably in the Z direction is attached. Yes.

As shown in FIG. 3, the lifting / lowering device 43 includes a ball screw shaft 53 that is rotatably supported at the center portion in the X direction of the main body frame 41 in a state of extending in the Z direction, and a belt on the upper end portion of the ball screw shaft 53. The head raising / lowering motor 55 is connected via 54, and the raising / lowering member 51 has a ball screw nut 56 to which the ball screw shaft 53 is screwed.
The head lifting / lowering motor 55 is attached to one end of the main body frame 41 in the X direction and outside the first compression coil spring 44.

The ball screw nut 56 is attached to the center of the elevating member 51 in the X direction. The elevating member 51 has a slider 57 attached to one end in the X direction adjacent to the head elevating motor 55, and is supported by the second guide rail 52 through the slider 57 so as to be movable in the vertical direction. Has been.
A pusher 58 for pushing the squeegee head 42 downward against the elastic force of the first compression coil spring 44 is provided at the other end of the elevating member 51 in the X direction. The pressing element 58 is positioned so as to overlap the pressure receiving plate 59 protruding from the lower end portion of the support plate 48 when viewed from above.

Between the pressing element 58 and the pressure receiving plate 59, a second compression coil spring 60 is mounted. That is, when the ball screw shaft 53 is rotationally driven by driving the head elevating motor 55 and a downward force is applied to the elevating member 51 via the ball screw nut 56, this force is applied to the pressing element 58, the second Are transmitted to the support plate 48 through the compression coil spring 60 and the pressure receiving plate 59. When this downward force becomes larger than the elastic force of the two first compression coil springs 44, the entire squeegee head 42 having the support plate 48 moves downward.
As shown in FIG. 2, the elevating device 43 has a squeegee head between a printing position where a squeegee 61 (described later) of the squeegee head 42 contacts the mask plate 6 and a retracted position where the squeegee 61 is spaced upward from the mask plate 6. It is comprised so that 42 can be raised / lowered.

  As shown in FIGS. 2 and 4, the squeegee head 42 includes the support plate 48 and a mounting member projecting from the upper end of the support plate 48 toward the front of the apparatus (leftward in FIG. 2). 62, a support member 64 attached to the attachment member 62 via a load cell 63, a cartridge holder 65 provided at the lower end portion of the support member 64, and the pair attached to the lower end portion of the cartridge holder 65 Squeegees 61, 61, an air cylinder 66 attached to the front portion of the support member 64, and the like.

  The load cell 63 is of a strain gauge type, resists the elastic force of the first compression coil spring 44 by driving the head lifting / lowering motor 55, and is applied from the mounting member 62 via the second compression coil spring 60. What can detect the magnitude | size of the downward force to be used is used. As will be described later, when the air cylinder 66 is not turned on, the load cell 63 has the same size applied from the substrate 8 via the mask plate 6, the squeegee 61, and the support member 64. The reaction force can be detected. Hereinafter, the reaction force detected by the load cell 63 is referred to as a load cell detection load.

The load cell 63 is connected to a control device 71 (see FIG. 5) described later, and sends the load cell detection load as a signal to the control device 71. In this embodiment, the load cell 63 constitutes a load detector referred to in the present invention, and the load cell 63 and a control device 71 described later constitute a sticking detection device referred to in the present invention.
The support member 64 is formed by combining a plurality of members, and is attached to the load cell 63 so as to extend in the vertical direction in front of the support plate 48.

  The cartridge holder 65 holds the cartridge 73 for supplying the solder paste 72 (see FIG. 2) and temporarily stores the solder paste 72. The cartridge holder 65 and the cartridge mounting portion 74 in which the cartridge 73 is loaded The solder paste chamber 75 is formed under the cartridge mounting portion 74. The cartridge mounting portion 74 has a rectangular tube shape that opens upward, and is formed so that the cartridge 73 can be detachably fitted.

  As shown in FIG. 2, the cartridge 73 includes a bottomed cylindrical extrusion container 81 that opens upward, and an extrusion lid 82 that closes the opening at the upper end of the extrusion container 81. The solder paste 72 is stored inside. The extrusion container 81 is made of plastic, and includes a cylindrical wall 81a having an oval shape that is long in the X direction in a plan view, and a bottom plate 81b integrally formed at the lower end of the cylindrical wall 81a by integral molding. It is configured. The bottom plate 81b has a plurality of through holes 81c through which the solder paste 72 is discharged.

  The lid 82 is slidably fitted into an opening having an elliptical shape that is long in the X direction of the cylindrical wall 81a, and is pressed downward by an air cylinder 66 described later. When the lid 82 is pressed downward, the lid 82 functions as a piston, and the solder paste 72 in the cartridge 73 is discharged into the solder paste chamber 75 through the through hole 81c.

  The solder paste chamber 75 is for temporarily storing the solder paste 72 discharged from the cartridge 73, and is formed to extend downward from the bottom of the cartridge mounting portion 74 as shown in FIG. Yes. As shown in FIG. 4, the solder paste chamber 75 according to this embodiment is formed inside a housing 83 protruding from the cartridge mounting portion 74 on both sides in the X direction. The bottom of the solder paste chamber 75 is constituted by a squeegee 61 described later.

  In this embodiment, the squeegee 61 is formed of a metal plate extending from one end portion in the X direction of the housing 83 to the other end portion. As shown in FIG. 2, the squeegees 61 and 61 are provided at the lower end portion of the cartridge holder 65 and at one end side and the other end side in the Y direction so as to be separated from each other. Further, these squeegees 61 are inclined so as to gradually approach the other squeegee 61 as it goes downward. Since the squeegee 61 is attached to the cartridge holder 65 in this way, a solder outlet 84 of the solder paste chamber 75 is formed between the squeegees 61.

  As shown in FIG. 2, the air cylinder 66 is attached to the front portion of the support member 64 so that the piston rod 85 presses the lid 82 from above. In this embodiment, as shown in FIG. 4, two air cylinders 66, 66 are provided at intervals in the X direction. A pressure plate 85a having an oval shape in plan view is fixed to the lower ends of the two piston rods 85, 85 of the air cylinders 66, 66. That is, when these air cylinders 66 and 66 extend (simple expression, the piston rods 85 and 85 agree with the expansion of each cylinder of the air cylinders 66 and 66), the lid body 82 of the cartridge 73 moves downward. Is pressed. These air cylinders 66 constitute a pressurizing device in the present invention.

  Air passages (not shown) through which air supplied to these air cylinders 66 are supplied to the air cylinders 66 in order to control the amount of pressing force when the air cylinders 66 press the lid 82. An electropneumatic regulator 86 (see FIG. 5) for changing the pressure of the air is provided. The electropneumatic regulator 86 is also connected to a control device 71 described later, and its operation is controlled by the control device 71.

  The control device 71 is for controlling the operation of each of the above-described devices of the screen printer 1, and as shown in FIG. 5, an arithmetic processing unit 91, a print program storage unit 92, a data storage unit 93, and a motor control unit. 94, an ON / OFF control unit 95, a pressure control unit 96, a sensor data input unit 97, an image processing unit 98, an external input / output unit 99, a notification unit 100, and the like.

The arithmetic processing unit 91 performs arithmetic operations to be described later, and executes various programs such as a printing program by linking the above-described units of the control device 71.
The print program storage unit 92 includes a memory that stores various programs described below. The various programs are, for example, the entire operation procedure of the printing process shown in FIG. 6, the operation procedure when checking the presence / absence of the fixing state shown in FIG. 7, and the operation when destroying the fixing state shown in FIG. This is a procedure, an operation procedure at the time of printing shown in FIG.

The data storage unit 93 includes a memory that stores initial values necessary for executing a program to be described later, various setting values, and the like.
The motor control unit 94 controls operations of various motors provided in the screen printing machine 1. The various motors include four motors 101 to 104 (see FIG. 5) for driving the X-axis table 14, the Y-axis table 13, the R-axis table 15, the lifting table 16 and the like of the printing stage 5, and for loading. The motor of the conveyor driving device 105, the motor of the carry-out conveyor driving device 106, the motor of the main conveyor driving device 107, the head lifting / lowering motor 55, the head Y-axis motor 35, and the like.

The ON / OFF control unit 95 turns on / off solenoids provided in the clamp unit 18 and the pin unit 17 of the printing stage 5 and an electromagnetic valve 108 provided in an air passage connected to the air cylinder 66. Switch between opening and closing.
The pressurization control unit 96 controls the operation of the electropneumatic regulator 86 so that the air cylinder 66 presses the lid 82 with a predetermined pressing force.

Since the pressurization control unit 96 pressurizes the solder paste in the solder paste chamber 75 from the cartridge 73 through the through hole 81c during printing, the air cylinder 66 presses the lid 82 with a relatively small pressing force. Thus, the electropneumatic regulator 86 is controlled. The pressurization control unit 96 is an electropneumatic regulator that causes the air cylinder 66 to press the lid 82 with a relatively large pressing force in order to break the adhesion when the lid 82 is fixed to the opening portion of the cartridge 73. 86 is controlled.
The sensor data input unit 97 measures the magnitude of the force based on the signal sent from the load cell 63, or is provided in other sensors such as the carry-in / carry-out conveyors 3 and 4 and the main conveyor 11. Various types of information are detected based on the state of other sensors 111.

The image processing unit 98 performs image processing on the image data sent from the board imaging camera 23 or the mask imaging camera 24 to obtain predetermined information.
The external input / output unit 99 is connected to a display unit 112 for displaying an operation state of the screen printing machine 1 and an input device 113 for an operator to input various data. The external input / output unit 99 displays an abnormality content on the display unit 112 so that the operator can visually recognize the abnormal state in the case of an abnormality described later.

  The notification unit 100 operates a notification device 114 provided in the screen printing machine 1. The notification device 114 according to this embodiment is constituted by a warning light. As this warning light, one that blinks yellow and one that blinks red are used. Note that the notification device 114 can be configured by a display device such as a CRD or a liquid crystal display that can display a warning screen, a buzzer, a visual indicator such as a warning light or a display device, and a buzzer. It can also be constituted by both of the voice type such as.

  Next, the operation of the screen printing machine 1 according to this embodiment will be described with reference to the flowcharts shown in FIGS. This operation will be described together with a more detailed description of the control device 71. Here, description will be made assuming that the squeegee head 42 is loaded with the cartridge 73 and the solder paste chamber 75 is filled with the solder paste 72.

  When screen printing is performed by the screen printer 1 according to this embodiment, first, initial setting is performed in step S601 of the flowchart shown in FIG. As the initial setting, the scheduled number of printed sheets N1 of the printed wiring board 8 that performs screen printing, the maximum number of executions A0 that is the upper limit of the number of times that an operation of destroying the fixed state described later can be performed, The load B3 when the fixed state is broken, the determination reference value B for determining the presence or absence of the fixed state, and the supply air pressure C1 (fixed state of the fixed state) to the air cylinder 66 for continuing to press the lid 82 during printing. In the case of checking, the supply air pressure C1 is the same as that during printing) and the supply air pressure C2 to the air cylinder 66 when the fixed state is broken.

The loads B1 and B3 are loads detected by the load cell 63. The load B1 is set to an appropriate value as a load slightly larger than the printing pressure load in which the squeegee 61 is supported by the printed wiring board 8 and presses the mask plate 6 during printing. Further, at the time of initial setting, N indicating the number of printed printed wiring boards 8 is set to 0, and A indicating the number of operations to be performed to destroy the fixed state is set to 0.
After the initial setting is completed, in step S602, it is determined whether or not the current print number N is smaller than the planned print number N1. If NO is determined here, that is, if the number of printed sheets N has reached the planned number of printed sheets N1, the control device 71 ends the printing operation and stops the screen printer 1 (step S603).

  If the current print number N is smaller than the planned print number N1, the printed wiring board 8 is positioned at a printable position in step S604. Here, the printed wiring board 8 is carried onto the printing stage 5 by the carry-in conveyor 3, the printed wiring board 8 is clamped by the clamp unit 18, the imaging by the board imaging camera 23, and the lifting / lowering table 16 is lifted to raise both conveyors 3, 4. The position of the printed wiring board 8 by the X-axis, Y-axis, and R-axis tables 13, 14, and 15 in the middle of ascent and the lifting table 16 are raised to the mask plate 6 of the printed wiring board 8 from the point of time away from the position. Are superimposed.

  After superimposing the printed wiring board 8 on the mask plate 6 in this manner, the squeegee head 42 is lowered by the elevating device 43 in step S605. As the squeegee head 42 descends, the squeegee 61 contacts the mask plate 6 from above. In this state, the lifting device 43 further biases the squeegee head 42 downward, so that the squeegee head 42 receives a reaction force consisting of an upward force from the mask plate 6. This reaction force is detected by the load cell 63.

  In step S605, the control device 71 stops the lifting device 43 when the load cell detection load detected by the load cell 63 reaches the load B1 at the start of printing. At this time, the contraction of the first compression coil spring 44 and the second compression coil spring 60 generates a load B1 slightly larger than the desired printing pressure load. In order to maintain this load B1, The vertical position of the elevating member 51 and the ball screw nut 56 is held, and for this holding, the rotational direction position of the ball screw shaft 53 fitted to the ball screw nut 56 is held. The rotational position of the ball screw shaft 53 is held by a head lifting motor 55 via a belt 54. The detected load B1 of the load cell 63 is measured by the sensor data input unit 97, and the operation of the lifting device 43 is controlled by the motor control unit 94. That is, in this embodiment, the motor control unit 94 and the sensor data input unit 97 constitute an elevation control unit referred to in the present invention.

  Next, in step S606, it is determined whether or not the current state of the screen printing machine 1 matches a predetermined condition described later. The predetermined condition is, for example, that the current printing number N is a predetermined number, and the elapsed time from the start of use of the cartridge 73, which is the first printing after cartridge replacement, has reached a predetermined time. Or the like, there is a possibility that the cartridge 73 may be fixed to the opening portion of the lid 82, or the confirmation of the fixation is required. At least one of these conditions is set as a predetermined condition.

If the current state of the screen printing machine 1 matches the predetermined condition, the process proceeds to step S607 to check whether there is a fixed state as will be described later, and if not, the process proceeds to step S608 to be described later. Print. In step S607 of the flowchart shown in FIG. 6, the check for the presence or absence of the fixed state is simply referred to as “fixed check”.
The presence / absence of the fixed state is checked as shown in FIG. In order to check the presence or absence of the fixed state, first, as shown in step S701, the air cylinder 66 (pressurizing cylinder) is operated so that the pressurizing pressure becomes C1. The pressurizing pressure C1 at this time is set by the pressurizing control unit 96 so that the air cylinder 66 presses the lid 82 with a relatively small pressing force.

  When the lid 82 of the cartridge 73 is pressed by the air cylinder 66, if the lid 82 is not fixed to the extrusion container 81, the solder paste 72 is discharged from the cartridge 73 to the solder paste chamber 75, and the solder paste chamber 75. The pressure of the solder paste 72 inside increases. When the pressure increases in this way, the squeegee head 42 is biased upward by this pressure, so that the magnitude of the reaction force substantially increases as described above, and the load cell detection load increases.

  In the operation of the air cylinder 66, the position of the head elevating motor 55 is stopped and held, and the vertical position of the elevating member 51 is also maintained, but the support plate 48 is raised and the first compression coil spring 44 is raised. And the contraction state of the 2nd compression coil spring 60 changes, and a load cell detection load increases. The load cell detection load at this time is the sum of the reaction force from the mask plate 6 by the squeegee 61 and the reaction force against the mask plate 6 pressing force by the solder paste pressure at the solder outlet 84. The reaction force based on the solder paste pressure at the solder outlet 84 is smaller than the reaction force at the squeegee 61, and the rising amount of the support plate 48 is slight. The amount of deflection of the squeegee 61 changes as the support plate 48 rises, and the reaction force from the mask plate 6 slightly decreases from B1. Strictly speaking, this reaction force slightly reduced from B1 becomes the printing pressure load.

  After operating the air cylinder 66 as described above, the control device 71 measures the current load cell detection load B2 by the load cell 63 in step S702, and detects the load cell 63 at the start of printing from the load cell detection load B2. The load B1 is subtracted and the value is set as the differential load B. The detection value referred to in the invention described in claim 1 is constituted by the load cell detection load B2. The sensor data input unit 97 measures the load cell detection load B2. Further, the calculation processing section 91 performs the calculation of B2-B1 for obtaining the differential load B and the comparison of numerical values in step S703 described later.

  Next, in step S703, the control device 71 determines whether or not the differential load B is greater than a predetermined determination load B0. When there is no sticking, the load B2 is larger than the load B1, while when it is completely stuck, the load B2 and the load B1 are the same. When it is slightly adhered, the load B2 is slightly larger than the load B1. The determination load B0 changes depending on where the reference for determining fixation is placed. This determination load B0 can be set to 0, for example, or a value obtained through experiments or the like. In obtaining the determination load B0 by an experiment or the like, the difference between the detected load of the load cell 63 detected when a necessary amount of the solder paste 72 is discharged from the cartridge 73 and the detected load B of the load cell 63 at the start of printing is used. be able to. The load B constitutes the detection value referred to in the present invention, and the determination load B0 constitutes the determination value referred to in the present invention.

  In step S701, when the lid 82 of the cartridge 73 is inserted into the extrusion container 81 and a necessary amount of solder paste 72 is discharged from the cartridge 73, in other words, when the lid 82 is not fixed to the extrusion container 81. The load cell detection load B2 is larger than the detection load B1 of the load cell 63 at the start of printing. In this case, YES is determined in step S703, and the process proceeds to step S704. On the other hand, when the lid 82 is fixed to the extrusion container 81, the solder paste 72 is not discharged from the cartridge 73, and the squeegee head 42 is not biased upward. B2 is equal to the load B1 at the start of printing, or the difference load B of the difference is smaller than the determination load B0. In this case, NO is determined in step S703, and the process proceeds to step S705.

In step S <b> 704, 0 indicating that the object is not fixed is substituted for a variable F indicating whether the object is fixed. In step S 705, 1 indicating substitution is substituted for the variable F.
In this way, when 0 or 1 is substituted into the variable F, the sticking check is completed. In step 706, the pressurization by the air cylinder 66 is stopped, and then the process proceeds to step S609 in the flowchart shown in FIG.

  In step S609 in FIG. 6, it is determined whether or not the lid 82 is fixed. If the lid 82 is fixed to the extrusion container 81, that is, if the variable F = 1, the process proceeds to step S610. In step S610, it is determined whether or not the number A of operations for destroying the fixed state described later is smaller than the maximum number of executions (upper limit of the number of operations for destroying the fixed state) A0. On the other hand, if the lid 82 is not fixed to the extrusion container 81, that is, if F = 0, the process proceeds to step S608 and printing described later is performed.

  If it is determined in step S610 that the number of times A for performing the operation for destroying the fixed state has reached the maximum number of times A0, the process proceeds to step S611, where the notification unit 100 operates the notification device 114. Then, the screen printer 1 is stopped. In this case, the alarm by the notification device 114 is performed by blinking a red warning light. At this time, it is displayed that the lid is fixed to the display unit 112. In step S610, when the number A of times of performing the operation for destroying the fixed state is less than the maximum number of times A0, the process proceeds to step 612, and an operation for destroying the fixed state is performed as described later. In step S612 of the flowchart shown in FIG. 6, destroying the fixed state is simply described as “fixed failure”.

  When the process proceeds to step S611, the operator replaces the cartridge 73 with a non-sticky non-defective product and presses the restart switch. When the restart switch is turned on, the execution of the flowchart is resumed from step S607. Thereby, generation | occurrence | production of a printing defect board | substrate is prevented. Further, when steps S610 and S612 are omitted in this flowchart, if it is determined in step S609 that there is sticking, the process proceeds to step S611, where an alarm is immediately performed and the screen printing machine 1 is stopped.

  The breaking operation in the fixed state is performed as shown in FIG. In order to destroy the fixed state, first, in step S801, the squeegee head 42 is lowered by the elevating device 43 to a position where the load cell detection load becomes B3. In this embodiment, the load cell detection load B3 is set so as to be larger than the load cell detection load B2 when there is no sticking, and further set so as to increase as the number A of times of performing the breaking operation in the sticking state increases. Has been.

  Next, in step S802, the cover 82 is pressed by applying a pressurizing pressure C2 to the air cylinder 66, and the pressurization by the air cylinder 66 is stopped after a predetermined time has elapsed. The pressurizing pressure C2 is set to be larger than the pressurizing pressure C1 when the above-described check for the presence or absence of the fixed state is performed. In this embodiment, the pressurizing pressure C2 is set so as to increase as the number of times A of the fixing fracture is increased. When performing step S802, the notification unit 100 blinks a yellow warning light.

As described above, the lid 82 is repeatedly pressed by the air cylinder 66 with a relatively large pressure C2, whereby the lid 82 can be moved relative to the extrusion container 81 in many cases. The fixed state of 82 can be eliminated.
The pressing of the lid 82 by the pressurizing pressure C2 of the air cylinder 66 and the holding for a predetermined time are repeatedly performed a predetermined number of times M. The number of times M can also be set to increase as the number of times A increases.

After the pressing and holding for a predetermined time are repeated M times, the control device 71 moves the squeegee head 42 to the position where the load cell detection load becomes a load B1 smaller than the load B3 by the lifting device 43 as shown in step S803. Raise. Then, 1 is added to the number A of times when the operation for destroying the fixed state is performed.
After the operation for destroying the fixed state is completed as described above, the process proceeds to step S607 in the flowchart shown in FIG. 6 to check again whether or not the fixed state exists. If it is determined in step S609 that there is no sticking after checking for the sticking state, printing is performed in step S608.

  Printing is performed as shown in FIG. In performing printing, first, as shown in step S901, the control device 71 detects the current position of the squeegee head 42 in the Y direction. If the squeegee head 42 is positioned at the front end of the apparatus (the left end in FIG. 2), it means that the variable Y indicating the target movement direction of the squeegee head 42 is behind in step S902. Assign a value. This value is a position value of an encoder (not shown) provided in the head Y-axis motor 35. As this value increases, the position of the squeegee head 42 becomes the rear side.

On the other hand, when the squeegee head 42 is located at the end portion on the front side of the apparatus, a value indicating that it is the front is substituted for the variable Y in step S903.
Next, in step S904, the air cylinder 66 (pressurizing cylinder) is operated so that the pressurizing pressure becomes C1, and in step S905, the current load cell detection load is measured by the load cell 63. Since the load cell detected load measured here does not necessarily coincide with the load cell detected load B2 measured at the time of checking the presence / absence of the above-mentioned fixed state, the load cell detected load in this case is defined as B2a.

  After measuring the load cell detection load B2a in this way, a predetermined small numerical value ΔB2a is subtracted from the load cell detection load B2a to obtain a lower limit load B4, and the above small numerical value ΔB2a is added to the load cell detection load B2a to obtain an upper limit load B5. Ask for. This calculation is performed by the calculation processing unit 91 of the control device 71.

  Thereafter, in step S906, the control device 71 controls the operation of the moving device 37. When the squeegee head 42 is stopped at the end in the Y direction, the squeegee head 42 is moved toward the other end, and when the squeegee head 42 is moving, the movement is continued so as to maintain a predetermined speed. Let In step S907, the load cell 63 measures the current load cell detection load B (a load different from the differential load B obtained in step S705). The current load cell detection load B is the sum of the reaction force that acts on the squeegee head 42 by the pressing force of the air cylinder 66 and the reaction force that is generated when the lifting device 43 lowers the squeegee head 42. Thereafter, in step S908, it is determined whether or not the load cell detected load B is larger than the lower limit load B4.

  When the load cell detection load B is less than or equal to the lower limit load B4, the process proceeds to step S909, the squeegee head 42 is lowered by a predetermined minute amount by the elevating device 43, and the process returns to step S907. If the load cell detected load B is greater than the lower limit load B4, it is determined in step S910 whether the load cell detected load B is smaller than the upper limit load B5. When the load cell detection load B is equal to or greater than the upper limit load B5, the process proceeds to step S911, the squeegee head 42 is lifted by a predetermined minute amount by the elevating device 43, and the process returns to step S907.

  By performing the feedback control in steps S907 to S911, the printing pressure load during printing can be maintained at a desired value. When the printed wiring board 8 is not distorted and is held flat by the pin unit 17, the printing load can be set to a desired value during printing without performing this feedback control.

  When the load cell detection load B is larger than the lower limit load B4 and smaller than the upper limit load B5, the current position value Y of the encoder provided in the head Y-axis motor 35 is detected in step S912. Next, in step S913, based on the position value Y, it is determined whether or not the squeegee head 42 is moving. This determination is performed using the encoder position value Y1 when the squeegee head 42 is positioned at the front end and the encoder position value Y2 when the squeegee head 42 is positioned at the rear end. The position value Y1 is set to be smaller than the position value Y2.

  That is, when the current position value Y is larger than Y1 and smaller than Y2, it is determined that the vehicle is moving, and the process returns to step S907. If the determination condition does not match, it is determined that the squeegee head 42 has moved to the front end or the rear end, and the movement of the squeegee head 42 in the Y direction by the moving device 37 is stopped in step S914. Let At this time, the supply of pressurized air to the air cylinder 66 is stopped after the stop to cancel the pressing force, and then the squeegee head 42 is raised by the elevating device 43 so that the squeegee 61 is located at the retracted position.

As described above, when the squeegee head 42 is raised at the end in the Y direction, one printing is completed.
After the printing is completed, the printed wiring board 8 is unloaded in step S613 of the flowchart shown in FIG. This unloading includes lowering of the lifting table 16, returning to the transport position of the X-axis table 14, Y-axis table 13, and R-axis table 15 during the lowering, positioning the main conveyor 11, and releasing the clamp of the printed wiring board 8. After the implementation, the printed wiring board 8 is carried out by the main conveyor 11 and the carry-out conveyor 4 to an apparatus for performing a post-process. Thereafter, in step S614, 1 is added to the variable N indicating the number of printed sheets, and the process returns to step S602.

  In the screen printing machine 1 configured as described above, the lid 82 of the cartridge 73 is fixed to the extrusion container 81 or is not completely fixed, but is difficult to move with respect to the extrusion container 81. (Abnormal state) is detected using the air cylinder 66 and the load cell 63, and when such an abnormal state occurs, the notification device 114 operates. In this embodiment, in this case, the red warning light blinks, and the abnormality content is displayed on the display unit 112.

  Therefore, according to this embodiment, it is possible to prompt the operator to replace the cartridge 73 in the abnormal state. Moreover, in the screen printing machine 1, since the screen printing operation is stopped together with the operation of the notification device 114, no printing failure occurs.

  In this embodiment, since the load cell 63 provided in the squeegee head 42 is used to detect whether the lid 82 is fixed, the squeegee head 42 is attached to the mask plate 6 for screen printing. The load (printing pressure, the load cell detection load B) and the detection of the presence or absence of the fixed state can be detected by one load cell 63. For this reason, compared with the case where the sensor for detecting the presence or absence of the adhering state of the cover body 82 is equipped exclusively, cost reduction can be aimed at.

The more correct printing pressure load is obtained by subtracting the reaction force of the load that the solder paste presses the mask plate 6 through the solder outlet 84 from the load cell detection load B during the printing movement of the squeegee head 42.
Assuming that the total pressure receiving area of the pistons (not shown) in the two air cylinders 66 is A1, the area of the opening (substantially equal to the area of the lid 82) is A2, and the area of the solder outlet 84 is A3, the reaction force is C1 × A1 ÷ A2 × A3. That is, C1 × A1 × A3 / A2. Since the area A2 of the lid 82 is larger than A1 and A3, the reaction force is smaller than the load cell detection load B.

In this embodiment, the operation of the lifting device 43 is controlled by feedback control so that the load cell detection load B becomes a value between the lower limit load B4 and the upper limit load B5 when performing the printing operation. For this reason, for example, even when the printed wiring board 8 is distorted and the upper surface thereof is not flat, the squeegee 61 can be moved so as to follow the upper surface of the printed wiring board 8 having the distortion. The printing pressure will always be appropriate.
In this embodiment, an example in which the sticking detection device is configured by the load cell 63 that is a load detector and the control device 71 is shown, but the load detector used in the sticking detection device according to the present invention is limited to the load cell 63. Other types of pressure sensors can be used.

(Second embodiment)
In order to check the presence or absence of the fixed state, the pressure in the solder paste chamber can be directly detected as shown in FIGS.
FIG. 10 is a cross-sectional view of a main part showing another embodiment, FIG. 11 is a block diagram of another embodiment, and FIG. 12 is a flowchart showing an operation when checking the presence or absence of a fixed state. In these drawings, the same or equivalent members as those described with reference to FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof is omitted as appropriate.

  A pressure sensor 121 for detecting the pressure of the solder paste 72 is attached to the cartridge holder 65 of the squeegee head 42 shown in FIG. The pressure sensor 121 is attached to the cartridge holder 65 so that the pressure detection unit on the tip side faces the solder paste chamber 75, and is connected to the sensor data input unit 97 of the control device 71 as shown in FIG. ing. The pressure sensor 121 measures the pressure of the solder paste 72 in the solder paste chamber 75 and sends it to the sensor data input unit 97 as a signal. In this embodiment, the pressure sensor 121 and the control device 71 constitute a sticking detection device according to the present invention.

  The screen printing machine 1 according to this embodiment uses the pressure sensor 121 to detect whether the lid 82 is fixed to the extrusion container 81. This check of the adhering state is performed in step S607 shown in FIG. 6 as in the first embodiment.

  In order to check the presence or absence of the sticking state using the pressure sensor 121, first, as shown in step S121 of the flowchart shown in FIG. 12, the pressurizing pressure of the air cylinder 66 (pressurizing cylinder) becomes C1. To make it work. Next, in step S122, the pressure P in the solder paste chamber 75 is measured by the pressure sensor 121, and in step S123, it is determined whether or not the paste pressure P is greater than a predetermined determination pressure P0. The paste pressure P constitutes the detection value referred to in the invention according to claim 2, and the determination pressure P0 constitutes the determination value referred to in the invention according to claim 2.

When the lid 82 of the cartridge 73 is not fixed to the extrusion container 81, the pressure of the solder paste 72 in the solder paste chamber 75 increases, so that YES is determined in step S123, and whether or not there is a fixed state in step S124. 0 is substituted into a variable F indicating. On the other hand, if the paste pressure P is equal to or smaller than the determination pressure P0, in step S125, 1 is substituted into the variable F indicating the presence / absence of the fixed state, whereby the fixing determination is completed, and in step S126. Pressurization by the air cylinder 66 is stopped.
After checking for the presence or absence of the fixed state in this way, the process proceeds to step S609 in the flowchart shown in FIG. 6 to perform the same operation as in the first embodiment.

As described above, even when the pressure sensor 121 detects the pressure of the solder paste 72 in the solder paste chamber 75, the same effect as that of the first embodiment is obtained.
In particular, as shown in this embodiment, it is possible to directly detect whether or not the solder paste 72 is discharged from the cartridge 73 by using the pressure sensor 121. The presence or absence of a state can be detected with high accuracy.
As a result, it is possible to reliably perform alarms and notifications when there is a fixed state, prevent printing from being stopped by stopping printing, and perform good printing by replacing or maintaining the cartridge 73. Can be recovered.

1 is a front view of a screen printing machine according to the present invention. It is sectional drawing which shows the structure of the principal part. It is a perspective view which shows the structure of a raising / lowering apparatus. It is a perspective view which shows the structure of the lower end part of a squeegee head. It is a block diagram which shows the structure of the screen printer concerning this invention. It is a flowchart which shows operation | movement of a printing process. It is a flowchart which shows the operation | movement when checking the presence or absence of the adhering state. It is a flowchart which shows operation | movement when destroying an adhering state. It is a flowchart which shows the operation | movement at the time of printing. It is sectional drawing of the principal part which shows another Example. It is a block diagram of another Example. It is a flowchart which shows the operation | movement when checking the presence or absence of the adhering state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Screen printer, 6 ... Mask plate, 7 ... Squeegee unit, 8 ... Printed wiring board, 37 ... Moving device, 42 ... Squeegee head, 43 ... Lifting device, 61 ... Squeegee, 63 ... Load cell, 66 ... Air cylinder, DESCRIPTION OF SYMBOLS 71 ... Control apparatus, 72 ... Solder paste, 73 ... Cartridge, 75 ... Solder paste chamber, 81 ... Extrusion container, 82 ... Lid, 91 ... Arithmetic processing part, 94 ... Motor control part, 96 ... Pressure control part, 97 ... sensor data input unit, 100 ... notification unit, 114 ... notification device, 121 ... pressure sensor.

Claims (6)

A solder paste supply cartridge that consists of a bottomed cylindrical extrusion container in which solder paste is stored and an extrusion lid, and the lid is pushed into the extrusion container so that the solder paste comes out from the bottom of the extrusion container. It ’s free,
A pressure device that presses the lid toward the bottom of the extrusion container;
The squeegee head is provided with a squeegee for applying the solder paste supplied from the cartridge and stored in the solder paste chamber to the mask plate for screen printing,
A lifting device that lifts and lowers the squeegee head between a printing position and a retracted position above the mask plate;
A moving device for moving the squeegee head horizontally along the mask plate;
In a screen printing machine provided with a control device for controlling the operation of these devices,
In the mounted solder paste supply cartridge, an adhesion detection device for detecting adhesion of the lid to the extrusion container;
A screen printing machine comprising: a notification device that notifies an operator when sticking is detected.   The screen printing machine according to claim 1, further comprising a notification unit that stops a screen printing operation when sticking is detected, in addition to the notification device. The sticking detection device includes a load detector that detects a magnitude of a reaction force generated by the squeegee pressing the mask plate, and the control device.
The control device includes a lifting control unit that lowers the squeegee head by the lifting device so that the load detected by the load detector reaches a predetermined initial value;
In a state where the squeegee head is lowered by the control of the elevation control unit, a pressure control unit that presses the lid with a predetermined pressure by the pressure device,
An arithmetic processing unit that determines whether or not there is a sticking based on a load detection value detected by the load detector and the initial value after the pressurization device is operated by the control of the pressurization control unit. The screen printing machine according to claim 1 or 2.   The arithmetic processing unit determines that there is no fixation when the difference between the load detection value and the initial value is greater than a predetermined determination value, and that there is fixation when the difference is smaller than a predetermined determination value. The screen printing machine according to claim 3. The sticking detection device is composed of a pressure sensor for detecting the pressure of the solder paste in the solder paste chamber and the control device,
The control device includes a lifting control unit for lowering the squeegee head by the lifting device so that the load detected by the load detector reaches a predetermined value,
In a state where the squeegee head is lowered by the control of the elevation control unit, a pressure control unit that presses the lid with a predetermined pressure by the pressure device,
2. An arithmetic processing unit for determining whether or not there is sticking based on a pressure detection value detected by the pressure sensor after the pressurization device is operated by the control of the pressurization control unit. The screen printer according to claim 2.   The arithmetic processing unit determines that there is no sticking when the pressure detection value is larger than a predetermined determination value, and there is sticking when the pressure detection value is smaller than a predetermined determination value. 5. A screen printing machine according to 5.

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