JP2009297897A - Screen printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a recognition mark added to a screen to be surely recognized. <P>SOLUTION: A screen support body 25 constituting a screen support means 13 is composed of a pair of supporting body 25A, a pair of opposing L-shaped crosssectional screen support member 25B fitted and fixed on this support body 25A and respectively supporting the undersurfaces of the opposing side parts of a screen frame SW of the screen S, and a U-shaped crosssection spring support body 25C which supports both opposing proximal end parts of respective sheet springs 20 curved and projected inward in channel part 25CK, and makes the intermediate parts of respective sheet springs 20 project from an opening part 25BK opened at one screen support member 25B and brings them into contact with the side face of the screen frame SW to support the screen S so as to energize the screen S in the direction of another screen support member 25B. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In the present invention, the screen and the printed board are aligned with the screen plate whose peripheral edge is supported by the screen frame, and the coating agent on the screen is applied to the printed board through the pattern holes by moving the squeegee. The present invention relates to a screen printing machine.

This type of screen printing machine is disclosed in, for example, Japanese Patent Application Laid-Open No. H10-228707. For example, the screen and the printed board are aligned, and the pattern hole is formed on the printed board by moving the coating agent on the screen by moving the squeegee. It is applied through.
JP 10-44370 A

  And it is necessary to replace the screen every time the type of printed circuit board to be screen printed is changed. However, when this screen is mounted and supported on the screen support, there is a problem that the mounting position is not fixed. If it is not fixed, the imaging position of the recognition mark attached to the screen for recognizing the position of the screen varies, and there arises a problem that the recognition mark cannot be reliably recognized.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to ensure the installation of a screen and to surely recognize a recognition mark attached to the screen.

  For this reason, the present invention aligns the screen with the peripheral edge of the screen plate supported by the screen frame and the printed board, and moves the coating agent on the screen through the pattern hole on the printed board by moving the squeegee. In the screen printing machine to be applied, a pair of opposed screen support members that respectively support the lower surfaces of the opposed side portions of the screen frame, and opposed base ends of curved plate springs, and the plate A spring support for projecting an intermediate portion of the spring from an opening provided in the one screen support member and contacting the side of the screen frame to urge the screen toward the other screen support member; It is provided.

  According to the present invention, it is possible to ensure the attachment of the screen and to reliably recognize the recognition mark attached to the screen.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the main part of the screen printing machine, FIG. 2 is a right side view of the main part of the screen printing machine, and FIG. 3 is a plan view of a state where the screen is attached to and supported by the screen support.

  First, in FIG. 1, a screen printing machine 1 includes a substrate support table 12 installed on a base 11, screen support means 13 disposed above the substrate support table 12, substrate support table 12, and screen support. A first image pickup means 14 for picking up an image of a substrate recognition mark placed diagonally on the printed circuit board P arranged between the means 13 and supported by the board support table 12, and a screen arranged above the screen support means 13; Second imaging means 15 for imaging a screen recognition mark attached to the screen S supported by the supporting means 13, a pair of print heads 16A and 16B (see FIG. 2) disposed above the screen S, and the substrate P Supply conveyor 17 for supplying the substrate P onto the substrate support table 12, and a discharge controller for discharging the substrate P from the substrate support table 12. And A 18, and a later monitor (not shown) to project an image captured by the first and second imaging means 14, 15.

  The screen S has a quadrangular shape in plan view, and the peripheral edge of the screen plate ST is supported by the screen frame SW.

  The substrate support table 12 has a first moving mechanism 21 for moving in the direction of the X axis (see FIG. 1) extending in the horizontal direction, and a rotation for rotating in a horizontal plane provided on the first moving mechanism 21. A mechanism 22; a second moving mechanism 23 provided on the rotating mechanism 22 for moving in the direction of the Z axis extending in the vertical direction; a substrate support plate 24 provided on the second moving mechanism 23; A transport mechanism (not shown) is provided on the upper surface of the substrate support plate 24 and transports the printed circuit board P in the X-axis direction.

  The screen support means 13 includes a screen support 25 that supports the screen S, a total of four cylinders 26 that are arranged above the screen support 25 and press the screen S against each screen support 25, respectively. And a moving mechanism 27 for moving in the direction of the Y axis extending in the horizontal direction.

  The screen support 25 that constitutes the screen support means 13 is a pair of support main bodies 25A and a pair of opposed main bodies that are attached and fixed to the support main body 25A and support the lower surfaces of the opposite sides of the screen frame SW of the screen S. The screen support member 25B having an L-shaped cross section and the opposite front and rear base ends of the plate springs 20 that are curved and project inward are supported in the groove 25CK, and the intermediate portions of the plate springs 20 A spring having a U-shaped cross section that protrudes from an opening 25BK opened in one screen support member 25B and abuts against the side surface of the screen frame SW to support the screen S in a direction toward the other screen support member 25B. It is comprised from the support body 25C. The spring support 25 is detachably attached to the screen support member 25B with screws, for example.

  In this way, the screen S is positioned with reference to the right screen support member 25B side. Moreover, the screen S is pressed and urged against the right screen support member 25B by the two leaf springs 20, so that the screen S is positioned without rattling. Further, since each leaf spring 20 is supported by the spring support 25C, not the support member 25B having the opening 25BK, the spring support 25C can be removed from the screen support member 25B without removing the support member 25B. Therefore, it can be easily exchanged.

  The first imaging means 14 includes a substrate recognition camera 28, a moving mechanism 29 that moves the substrate recognition camera 28 in the X-axis and Y-axis directions, and an illumination device that irradiates light onto the substrate P on the substrate support table 12 ( (Not shown). The second imaging means 15 includes a screen recognition camera 31, a moving mechanism 32 that moves the camera 31 in the X-axis direction, and an illumination device (not shown) that irradiates the substrate P on the substrate support table 12 with light. The screen recognition camera 31 is moved in the Y-axis direction by the moving mechanism 34 of the print heads 16A and 16B.

  As shown in FIG. 2, the print heads 16A and 16B are arranged at intervals in the Y-axis direction, and squeegees 33A and 33B are attached to the lower end portions, respectively, and are simultaneously moved in the Y-axis direction by the moving mechanism 34. While moving, the vertical movement mechanisms 35A and 35B individually move in the Z-axis direction. When the print heads 16A and 16B move to the left in FIG. 2, the right print head 16A descends and the squeegee 33A slides on the screen plate ST of the screen S and moves to the right in FIG. In doing so, the left print head 16B descends and the squeegee 33B slides on the screen plate ST. Therefore, two printing processes are performed by one reciprocating movement of the print heads 16A and 16B.

  The supply conveyor 17 is connected to the substrate support table 12 by moving the substrate support table 12 to the left in FIG. 1, and when the supply conveyor 17 is driven in this state, the transport mechanism of the substrate support table 12 is interlocked. ing. Further, the discharge conveyor 18 is connected to the substrate support table 12 by moving the substrate support table 12 in the right direction in FIG. 1. When the discharge conveyor 18 is driven in this state, the transport mechanism of the substrate support table 12 is interlocked. It has become.

  Next, the operation of the screen printer 1 will be described. First, when the printed circuit board P is placed on the supply conveyor 17, a photo sensor (not shown) detects this, and a board stopper (not shown) descends to hold the board P so that it does not move during transport. . Next, the substrate support table 12 moves to the left in FIG. 1 and is connected to the supply conveyor 17.

  Then, the supply conveyor 17 is driven, and the substrate P is transferred onto the substrate support table 12 in conjunction with the transfer mechanism of the substrate support table 12, and when the predetermined position is reached, the supply conveyor 17 stops. Then, after the substrate P is positioned on the substrate support table 12 by a positioning mechanism (not shown), the substrate support table 12 moves rightward to the initial position (hereinafter referred to as “origin position”). Return.

  Next, the board recognition camera 28 of the first imaging means 14 moves in the X-axis direction and the Y-axis direction to pick up two board recognition marks on the diagonal line of the printed board P, and the image is a recognition processing device. The position information is stored in the storage means.

  Further, the screen recognition camera 31 of the second image pickup means 15 moves in the X-axis direction and the Y-axis direction to pick up two screen recognition marks on the screen S, and the image is recognized by the recognition processing device. This position information is stored in the storage means.

  Then, the control means compares the position of each substrate recognition mark stored in the storage means with the position of each screen recognition mark, and calculates a positional deviation amount for relatively positioning the substrate P and the screen S. And stored in the storage means.

  Therefore, based on the amount of deviation, the control means drives the moving mechanism 21 of the substrate support table 12, the rotating mechanism 22, and the movement mechanism 27 of the screen support means 13, so that the relative positional deviation between the printed board P and the screen S is achieved. Correct the position.

  Next, one of the print heads 16A and 16B, for example, the right print head 16A is lowered by the vertical movement mechanism 35A, the squeegee 33A is moved in the Y-axis direction by the movement mechanism 34, and the squeegee 33A is the screen of the screen S. By sliding on the plate ST, a solder paste as a coating agent is applied onto the land of the printed circuit board P through the printing pattern holes H provided in the screen plate ST.

  A case where another printed board P is processed instead of the printed board P to be processed will be described below. First, the cylinder 26 is operated to stop pressing the screen S against each of the screen supports 25, and the operator removes the screen S from the pair of L-shaped screen support members 25B. Next, when a new type of different screen S is moved to the back while sliding on the pair of screen support members 25B as shown in FIG. 4, one screen support member 25B is moved in the middle of the movement. The left side surface of the screen S comes into contact with the top of the curved leaf spring 20 that protrudes from the opening 25BK that is opened at the front side. Further, when the plate spring 20 is pushed against the urging force of the leaf spring 20, the movement becomes possible, the left side surface of the screen S abuts on the top of the plate spring 20 on the back side, and further against the urging force of the leaf spring 20. When it is pushed in, it becomes possible to move, and eventually the rear side surface of the screen S comes into contact with a stopper (not shown), and the movement becomes impossible.

  Therefore, in this stopped state, the screen S is pressed and urged by the leaf spring 20 to the right screen support member 25B and positioned. That is, the screen S is positioned with reference to the right screen support member 25B side. In addition, the screen S is pressed and urged to the right screen support member 25B by the front and rear leaf springs 20, so that the screen S can be positioned without rattling. Therefore, the screen recognition camera 31 can surely capture the screen recognition mark attached to the screen S, recognize the positions of the printed circuit board P and the screen S, and align them.

  Although the embodiments of the present invention have been described above, various alternatives, modifications, and variations can be made by those skilled in the art based on the above description. It encompasses alternatives, modifications or variations.

It is a front view of a screen printing machine. It is a right view of the principal part of a screen printer. It is a top view of the state which attached and supported the screen to the screen support body. It is a top view of the state which is going to attach a screen to a screen support body. It is a cross-sectional top view of a left screen support member and a spring support body. It is a vertical front view of a left screen support member and a spring support.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen printer 13 Screen support means 20 Leaf spring 25 Screen support body 25A Support main body 25B Screen support member 25C Spring support body 25BK Opening part 25CK Groove part S Screen

Claims (1)

  A screen printing machine that aligns a screen whose peripheral part is supported by a screen frame and a printed board, and applies a coating agent on the screen to the printed board through a pattern hole by moving a squeegee. A pair of opposing screen support members for supporting the lower surfaces of the opposing side portions of the screen frame, and opposing base ends of the curved leaf springs, and an intermediate portion of the leaf spring as the intermediate portion. A spring support that protrudes from an opening formed in one screen support member and contacts the side surface of the screen frame to support the screen so as to bias the screen toward the other screen support member; Screen printing machine.

Images