JP2557747B2 - Screen printing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen printing machine for applying a coating material on a screen plate to a printed circuit board by moving a squeegee through the screen plate.

[0002]

2. Description of the Related Art In this type of screen printing machine, when printing of a coating agent on a printed circuit board is performed a predetermined number of times, the coating agent adheres to the back surface of the screen plate and it is necessary to perform manual cleaning. Although there are devices that automatically perform this cleaning, automatic cleaning is often insufficient, and manual cleaning is required.

Further, in this type of device, the device is shielded by a safety door so that an operator does not come in contact with the movable part of the device, and when the safety door is opened, power is supplied to a motor as a drive source of the movable part. It is designed so that the supply is stopped.

[0004]

However, in the above-mentioned prior art, when the safety door is opened in order to manually clean the screen plate, the power supply to the motor for driving the movable part is stopped. When the motor is de-energized, if the worker comes into contact with a stopped moving part, it will move without trying to hold that position, and the rotation position of the motor will change from the position stored in the CPU. I will end up. Even in the case of a servo motor, the position is unknown because the encoder circuit does not work when the power is not supplied.

Due to such a possibility, after the cleaning of the screen plate is completed, each motor must be returned to the origin position before starting the printing operation, which is troublesome.
It has the drawback of reducing the operating rate of the screen printing machine.

Therefore, an object of the present invention is to reduce the labor involved in cleaning the screen plate by hand and to increase the operating rate of the screen printing machine.

[0007]

Therefore, the present invention provides a screen printing machine for applying a coating material on a screen board to a printed circuit board by moving a squeegee through the screen board. A more shieldable safety door, a door switch that operates when the safety door is closed, and a cleaning switch that operates when performing manual cleaning of the screen plate,
A power supply circuit capable of supplying power to the drive source of the movable portion when either the door switch or the cleaning switch is in an operating state, and the movable portion of the movable portion when performing manual cleaning of the screen plate. The control means for controlling the position is provided.

[0008]

When the screen plate is manually cleaned, the power supply circuit supplies power to the drive source of the movable part even if the cleaning switch is activated and the operator opens the safety door and the door switch is no longer in operation. Then, the control means controls to hold the position of the movable part.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. 2 to 4, (1) is a screen printing machine, (2) is a supply conveyor section for supplying a printed circuit board (20) described later from an upstream device, and (4) is the substrate (20). It is a chuck positioning unit that positions the chuck (5) to be fixed.

(6) is a printing section for printing paste solder (178) described later on the board (20), and (8) is a supply conveyor section (2) for discharging the board (20) from the printing section (6). ) Is a discharge conveyor section having the same structure as the above. (9)
When a chuck (5) is exchanged, is a chuck supply part on which a new chuck (5) is placed, and (10) is a chuck discharge table on which the exchanged chuck (5) is discharged.

Reference numeral (11) is a recognition camera driving section for driving the recognition camera (12). (14) is a cleaning section,
(15) is an operation unit, (16) is a tower light, (1
7) and 17) are safety doors that can shield the movable part of the printing machine from the operator. (18) (18) are door opening / closing switches that detect opening / closing of the safety door (17).

Next, the chuck (5) will be described.
In FIGS. 5 and 6, reference numeral (20) is a printed circuit board, which is gripped and fixed by chuck rails (23) provided on the movable wall (21) and the fixed wall (22). The fixed wall (22) is fixed to the chuck base (24), and the movable wall (21) is fixed to the fixed wall (22) along a guide rail (25) provided on the chuck base (24). It is possible to move while keeping parallel with each other, and it is possible to change the interval with the fixed wall (22). A guide rod (26) extending from the fixed wall (22) in parallel with the guide rail (25) penetrates the movable wall (21), and a screw (27) fixes the movable wall (21) to the guide rod (26). By doing so, it is fixed to the chuck base (24).

Pulleys (28) are provided on the fixed wall (22) and the movable wall (21), and the chuck belt (3)
0) is suspended. A supply gear (31) is attached to the pulley (28) at the end on the supply conveyor section (2) side,
A discharge gear (32) is axially attached to the pulley (28) at the end on the printing section (6) side.

(41) is a backup pin plate (4
2) A plurality of backup pins installed upright on the backup pin plate (4
As the substrate 2 is moved up and down, the substrate (20) is supported by the chuck belt (30) represented by the solid line in FIG. 5, and the upper surface of the substrate (20) represented by the chain double-dashed line is the upper surface of the chuck rail (23). Raise and lower between positions that have approximately the same height.

Next, the supply conveyor section (2) will be described. In FIGS. 7 and 8, (49) is a supply side motor which rotates the drive pulley (50). The pulley (5
0) and the transmission pulley (51) between the transmission belt (5
2) is suspended, and a belt driving pulley (53) is axially mounted on the transmission pulley (51). The belt drive pulley (53) is pivotally supported on the pulley shaft (54). A supply belt (57) is wound around the belt driving pulley (53) and a pulley (56) arranged on the support wall (55), and the pulley (51) is driven by the supply side motor (49).
The supply belt (57) rotates via (53) and (56) to convey the printed circuit board (20).

Reference numeral (58) is a movable support wall, which is movable along the guide shaft (59) and the pulley shaft (54). Also on the side of the movable support wall (58), the belt drive pulley (5
3) is pivotally supported by the pulley shaft (54), and the supply belt (57) is hung between the pulley (56) and the pulley (56). Belt (57)
The gear drive pulley (60) closest to the chuck position determining section (4) among the pulleys (56) around which the drive gear (62) is separated from the support wall (55) or the movable support wall (58). ) Is pivotally mounted, and a transmission gear (63) is engaged with the drive gear (62).

The transmission gear (63) is attached to an oscillating plate (64) which can oscillate about the rotary shaft of the drive gear (62), and (65) shows the oscillating plate (64). 7 is a spring that urges it to rotate in the counterclockwise direction, and (66) is a stopper that restricts the swing plate (64) that rotates in the same direction. The transmission gear (62) can be meshed with the supply side gear (31) of the chuck (5) fixed to the chuck positioning part (4), and the supply side gear (31) is rotated by the rotation of the supply belt (57). To rotate.

Similarly, the discharge conveyor section (8) is also provided with a mechanism for driving the discharge side gear (32) of the chuck (5).

Next, the chuck position determining section (4) will be described. 9 to 11, (87) is an XY-θ table on which the chuck (5) extruded from the chuck supply unit (9) is placed. The table (87)
Is composed of an X table (88), a Y table (89) and a θ table (90).

The X table (88) is moved along the pair of X guide rails (93) provided on the base (91) by the rotation of the X screw shaft (95) by the driving of the X motor (94).
It moves in the X direction via the nut body (96). The X guide rail (93) is provided so that the XY-θ table (87) can be moved within the range from the chuck positioning unit (4) to the printing unit (6).

The Y table (89) is a pair of Y guides provided on the X table (88) via the Y nut body (99) by the rotation of the Y screw shaft (98) driven by the Y motor (97). Move in the Y direction along the rail (100).

The rotation of the θ ball screw shaft (102) by the drive of the θ motor (101) causes the nut body (104) having the roller (103) at one end to move along the screw shaft (102). (103) is the θ table (9
0) is fitted into the notch (105), and the θ (rotation shaft) (106) is used as a fulcrum to move the θ by the movement of the roller (103).
The table (90) rotates in the θ direction.

The θ table (90) is provided with a guide (108) for guiding the movement of the chuck (5).
The guide (108) on the right side in FIG. 11 is cut away at two positions, and the θ table (90) is attached to the lock lever shaft (10
A lock lever (110) for fixing the chuck base (24) is provided so as to be swingable around 9). The lock lever (110) swings counterclockwise as shown in FIG. 9 when a cylinder (112) provided on the θ table (90) contacts and is pressed by a cam follower (111) provided on the lower portion thereof. Lock the chuck base (24). The lock lever (110) is biased by a spring (not shown) so as to swing clockwise in FIG.

In FIG. 11, (118) is XY-θ.
A table standby position detection sensor for detecting a standby position of the table (87) on the side of the supply conveyor section (2).

Next, the recognition camera drive section (11) will be described. In FIGS. 3, 4, 12, and 13, (1
26) is an X moving body, and includes an X camera drive motor (12
Rotation of the X camera screw shaft (128) by driving 7) causes the X camera guide (130) via the nut (129).
Move in the X direction along. The X moving body (126) is driven by a Y camera drive motor (131) to rotate Y.
The camera screw shaft (132) is attached, and the recognition camera (12) attached to the Y nut body (133) fitted to the screw shaft (132) is the Y camera provided on the X moving body (126). By moving the screw shaft (132) along the camera guide (134), the screw shaft (132) is moved in the Y direction, and the substrate (20) is moved.
And the position of the screen plate (144) described later are recognized.

A stopper cylinder (136) is further attached to the Y-nut body (133) so as to extend and retract the rod (137) in the vertical direction, and a chuck positioning portion is provided via a stopper pin holder (138). A stopper pin (139) for restricting the printed circuit board (20) of (4) is connected at the tip of the rod (137). The stopper pin (139) is moved to Y by the operation of the cylinder (136).
It moves up and down while being guided through the nut body (133). The stopper pin holder (138) has a substrate (20).
A substrate sensor (140) for detecting is attached.

Next, the printing section (6) will be described. 14 to 19, reference numeral (142) is a screen base, and a screen plate (14) is swingable around a screen support shaft (143) provided on the base (142).
4) A screen mount (145) for mounting is attached. The screen base (142) is provided with a screen positioning pin (146), and the screen mount (1
The screen mounting base (145) is positioned and fixed on the screen base (142) by inserting the pin (146) between the pair of positioning rollers (147) provided in 45).

Numeral (149) is a squeegee mount which can be swung around the screen support shaft (143), which is placed on the screen mount (145) and is connected by the connecting plate (150) to the screen mount (145). Connected with. The squeegee mount (149) is provided with a stopper (151) and a stopper (152), and the stopper (151) abuts on a stopper bolt (153) provided on the screen base (142) and the stopper (152). ) Is a stopper bolt (15) provided on the screen mount (145).
4), and the vertical positions of the screen mount (145) and the squeegee mount (149) with respect to the screen base (142) are restricted.

The connecting plate (150) is connected to the squeegee mounting base (149) with a support bolt (156) as a fulcrum. The connecting cylinder (15) is also provided on the squeegee mounting base (149).
It is attached so that it can be swung according to 7). The connecting plate (1
The engaging groove (158) is notched in the groove (50), and the connecting plate (150) is swung by the operation of the cylinder (157) so that the engaging groove (158) is provided in the screen mount (145). The engagement bolt (159) is fitted to the screen mount (145) and the squeegee mount (149) as shown in FIG.

A pillar (161) is erected on the screen base (142), and a support shaft (1) above the pillar (161).
62) and the support shafts (163) provided on the squeegee mount (149), respectively, support shafts (162) (163).
The screen upper and lower cylinders (16
4) is attached, and the operation of the cylinder (164) causes the squeegee mount (149) to move the screen support shaft (1).
43) Swing around. Squeegee mount (149) and screen mount (145) by connecting plate (150)
When the cylinders are connected, the screen mount (145) and the squeegee mount (14) are operated by the operation of the cylinder (164).
It swings together with 9).

The squeegee mount (149) is further provided with a squeegee base guide (166).
A squeegee base (167) is movable along the direction 66) in the X direction. The rotation of the print motor (168) is decelerated by the speed reducer (169), transmitted to the drive pulley (170), rotated, and squeegeeed between the drive pulley (170) and the driven pulley (171). Belt (172)
The squeegee base (167) attached to the belt (172) moves by rotating. Squeegee stand (16
7) is provided with a shading plate (173), and the shading plate (17)
The origin position of the squeegee base (167) is detected by detecting 3) by the origin detection sensor (174).

Two squeegees (175) facing each other are mounted on the squeegee base (167) so as to be vertically movable by the operation of the squeegee vertical cylinder (177) guided by the squeegee vertical guide (176). The squeegee (175)
20 and 23, the paste solder (178) moves on the XY-θ table (87) through the pattern hole formed in the center of the screen plate (144). It is printed on the printed circuit board (20).

Next, referring to FIG. 15, a ball screw shaft (179) for supporting the screen base (142) on the base (91) and moving it up and down to bring the screen plate (144) and the printed circuit board (20) into and out of contact with each other. ) Are provided. The screen vertical drive pulley (181) is rotated by driving the screen vertical motor (180) to rotate the belt (182).
Also, the screen vertical rotation shaft (184) is rotated through the screen vertical driven pulley (183). The rotating shaft (184) is provided with a worm (185),
The ball screw shaft (179) is rotated by meshing with a worm wheel (186) provided on the screw shaft (179) and rotating the rotating shaft (184). The rotating shaft (18
4) is provided with a bevel gear (187), which engages with a bevel gear (188) axially attached to a rotation shaft (not shown) which is provided orthogonally to the rotation shaft (184), so that the rotation is performed. The rotation of the shaft (184) is transmitted to the ball screw shaft (179) on the opposite side of FIG. 15 by a similar structure.

The four ball screw shafts (1
The nut (189) provided on the screen base (142) is fitted to the screen base (142), and the screen base (142) is attached to the screen vertical guide (19) provided on the base (91).
It moves up and down along 0). The screen up-down motor (180) separates the paste solder (178) from the printed board (20) after the paste solder (178) is applied to the end surface of the pattern hole of the screen board (144). Servomotors or pulse motors are used to raise the screen plate (144) at a low speed such that 178) does not remain.

Next, the cleaning section (14) will be described. 24 to 27, reference numeral (192) denotes a cleaning unit which is guided by the X guide rail (93) and is movable below the screen plate (144) in the X direction. The belt joint (193) serves as a belt (19).
It is joined to 4). The belt (194) has a driving pulley (19) driven by a cleaning unit motor (195).
6) and the driven pulley (197), and the cleaning unit (1) is rotated by the rotation of the motor (195).
92) moves. Reference numeral (198) is a cleaning origin detection sensor for detecting the origin of movement of the cleaning unit (192) in the X direction.

The cleaning unit (192) is provided with a paper supply roll (200) for winding the cleaning paper (199) with its end fixed, and the cleaning paper (1) supplied from the roll (200).
99) is wound around the paper feed detection roll (201), then wound around the surface of the cleaning roller (202) and wound around the winding roll (203).

Reference numeral (205) is a take-up motor, and a take-up drive pulley (207) is provided through a torque limiter (206).
Is rotated, and the winding roll (203) is rotated via the winding belt (208) and the winding driven pulley (209). When the cleaning paper (199) is supplied to the end and the material runs out, the take-up roll (203) stops rotating and a predetermined load is applied to the torque limiter (206),
The torque limiter (206) turns off the motor (205)
Only the idle is made.

(211) is a paper feed detection roll (201)
The disk is axially attached to the disk, and slits (212) are provided at equal intervals on the periphery of the disk. When the cleaning paper (199) is wound by the rotation of the winding motor (205), the roll (201) is rotated by the amount of the feed and the disc (21) is rotated.
1) rotates by the same feed amount, but the feed amount detection sensor (21
The feed amount of the cleaning paper (199) is detected by detecting the slit (212) through which 3) passes. The supply roll (200) has a brake spring (2
14) It is sandwiched by a predetermined force into the winding motor (205).
When the winding motor (205) is stopped by braking the rotation of the supply roll (200) by the supply roll (20).
0) is also stopped at the same time so that the paper (199) is always in tension. The spring (214) clamps the supply roll (200) with a force that does not cut the torque limiter (206).

The cleaning roller (202) is provided at the tip of an arm (217) swingable around a support shaft (216), and the roller up-down cylinder (218).
Since the tip end of the rod (219) that moves up and down by the operation of is connected to the arm (217) via the spring (220), the cleaning roller (202) moves up and down by the operation of the cylinder (218). The roller (202)
Of the paper (19) on the lower surface of the screen plate (144).
9) in contact with the cleaning unit (19
The screen plate (14) is automatically moved by moving 2).
4) The lower surface is cleaned.

Reference numeral (222) is an actuator, which is swingable around the support shaft (223), and which has a spring hook (2).
The spring (225) hung on (24) presses the cleaning paper (199) wound around the supply roll (200) biased in the counterclockwise direction in FIG. 27, and the position is determined by the winding diameter. . Reference numeral (226) is a paper run-out notice switch which is used when the winding diameter of the cleaning paper (199) reaches a predetermined amount.
It is turned “ON” by 2) and outputs the paper end notice signal.

Next, the control system will be described. In FIG. 1, reference numeral (229) is a CPU, which performs various operations related to the printing operation of the printed circuit board (20) of the screen printing machine (1) based on information stored in the RAM (230).
This is performed according to the program stored in the OM (231).

Reference numeral (232) is an interface, which is an operation unit (15), a recognition camera (12), a CRT (233),
A tower lamp (16) and various sensors are connected, and a relay (260) is connected. (239) is a drive circuit for driving each motor and each cylinder.
(261) is a relay contact of the relay (260) and is closed when the relay (260) operates.

The door opening / closing switches (18) attached to the two safety doors (17) that open and close with the right end of FIG.
61) connected in parallel to the relay contact (26
A relay (262) is connected in series with 1) and the switch (18). The switch (18) is closed when the corresponding safety door (17) is closed and is opened when the safety door (17) is opened.

Reference numeral (263) is a relay contact of the relay (262), and reference numeral (264) is an electromagnetic contactor, both of which are connected in series with each other and are connected between the AC lines supplied from the power source (265). It The relay contact (263) is closed when the relay (262) is activated. A power supply (265) is connected to the drive circuit (239), and a contact (266) of the electromagnetic contactor (264) is provided on each line connecting the drive circuit (239) and the power supply (265). When the relay contact (263) is closed and the contactor (264) is operated, the contact (26) is provided.
6) is closed and the drive circuit (239) is energized.

When the motor driven by the drive circuit (239) is a servo motor, the encoder circuit for detecting the rotational position of the motor is energized by a power supply line to the drive circuit (239) as a part of the drive circuit (239). Therefore, when the contact (266) is opened, the position detection is not performed.

During normal operation of the screen printing machine (1), the CPU (229) does not operate the relay (260) and the relay contact (261) is opened.
Door open / close switch (18) when safety door (17) is opened
Is opened and the power supply (265) is cut off, but when it comes to the timing of cleaning the lower surface of the screen plate (144) and the replacement of the cleaning paper (199) by a manual operation described later, the relay (260) is turned on. The relay contact (261) is closed when activated, so that the power supply (265) is not shut off even when the safety door (17) is opened.

The RAM (230) outputs a print counter (240) that counts the printing operation of the substrate (20) for each sheet, a cleaning counter (241) that counts the number of times of automatic cleaning, and a paper-out warning signal. A paper out advance notice counter (242) that is subtracted from the number of times set after the automatic cleaning is provided, and the number of automatic cleanings set in the paper out advance notice counter (242) after the NC data and the paper out advance notice signal are output. Is set and stored.

Next, the operation section (15) will be described. A numeric keypad (24) for inputting data is input to the operation unit (15).
9), a cursor key (250), a PB key (268), which is pressed when the cleaning of the lower surface of the screen plate (144) by manual work is completed and the operation of the relay (260) is stopped by the CPU (229), NC. Teaching key (252) to enter the data setting mode, manual key (25 to enter the manual operation mode such as home return)
3), automatic key (25
4), a start key (255) for starting the operation, an operation key (256) for starting the home-return operation, and a stop key (257) for stopping the operation.

Next, the setting operation of the NC data will be described. First, when the teaching key (252) is pressed, the CRT
The screen of (233) is OPE for setting NC data.
The RATITION DATA EDIT screen appears (Fig. 28
reference). Next, the operator operates the ten keys (249) or the like to input each data as shown in the screen of FIG.

Each data in FIG. 28 will be described. "A
UTOMATIC CLEANING INTERVA
“L” indicates the number of (for example, 10) substrates (2) for the timing of the automatic cleaning operation of the lower surface of the screen plate (144).
This is the data specified by printing 0), and
The number of printed sheets of 0) is set.

"AUTOMATIC CLEANING
COUNT "is a manual screen plate (144)
This data is used to specify the timing for cleaning the lower surface, and the number of times of automatic cleaning operation (for example, 12 times) is set.

The operation will be described below with the above configuration. First, the chuck (5) is pushed out from the chuck supply section (9) and placed on the XY-θ table (87). Then, the cylinder (112) operates and the lock lever (110) fixes the chuck base (24), so that the chuck (5) is fixed on the XY-θ table (87).

Next, when the operator presses the automatic key (254) and the start key (255), the X motor (94) rotates and the XY-θ table (87) is shown in FIGS. Moving to the left, the supply side gear (31) of the chuck (5) engages with the transmission gear (63) of the supply conveyor section (2) as shown in FIGS. 7 and 8.

Then, the supply side motor (49) rotates to rotate the supply belt (57) via the drive pulley (50), the transmission belt (52), the transmission pulley (51) and the belt drive pulley (53). The printed circuit board (20) is moved and is conveyed. The gear drive pulley (60) is rotated by the rotation of the supply belt (57), the drive gear (62) is rotated, and the supply gear (31) is driven via the transmission gear (63). As a result, the pulley (28) pivotally attached to the gear (31)
Is rotated so that the chuck belt (30) is rotated, and the substrate (20) conveyed to the supply belt (57) is conveyed.

When the supply / transport operation of the substrate (20) is started, the X camera drive motor (127) and the Y camera drive motor (131) rotate to move the substrate () to the center position of the chuck (5) in the X direction. The stopper pin (139) moves to a position where the center of 20) is stopped. Then, the stopper cylinder (136) is operated and the stopper pin (139) is lowered.

In this way, when the printed board (20) is conveyed to the chuck belt (30), the board (20) comes into contact with the stopper pin (139) and is stopped, and the board sensor (140). Detects the substrate (20), and the detection signal causes the CPU (229) to stop the supply side motor (49) and stop the rotation of the chuck belt (30).

Next, the backup pin plate (42) on which a large number of backup pins (41) are arranged is raised by an unillustrated up-and-down moving means to support the substrate (20) on the chuck belt (30). 2 is raised to the upper position of the chuck rail (23) indicated by the chain double-dashed line.

Then, the chuck rails (23) move along the guide rails (25) in the direction in which the distance between the chuck rails (23) is narrowed, and the printed circuit board (20) is gripped and fixed. When the fixing operation of the substrate (20) is completed, the X-Y-θ table (87) is moved in the direction of separating from the supply conveyor section (2) by the rotation of the X motor (94).

Next, the substrate (2
The position recognition of 0) is performed. That is, the recognition camera (12) is moved onto a positioning mark (not shown) of the board (20) by the rotation of the X camera drive motor (127) and the Y camera drive motor (131), and the position of the board (20) is recognized. . Based on this recognition result and the recognition result of the already recognized position of the screen plate (144), the substrate (20) is moved to the screen plate (14) with respect to the screen plate (144).
4) The XY-θ table 87 is rotated by the rotation of the X motor 94 so that the Y motor 97 rotates in the X direction along the X guide rail 93. Due to the movement, it moves in the Y direction along the Y guide rail (100) and stops below the screen plate (144).

After that, the θ table (90) is rotated in the θ direction with the θ support shaft (106) as a fulcrum by the rotation of the θ motor (101), and the substrate (20) is positioned with respect to the screen plate (144). It is positioned at the position to be.

Next, the screen up / down motor (180) is rotated, and the screen up / down rotating shaft (184) is moved through the screen up / down driving pulley (181), the belt (182) and the screen up / down driven pulley (183). The worm wheel (186) that rotates and meshes with the worm (185) provided on the shaft (184) rotates, and the ball screw shaft (179) rotates. And the rotating shaft (184)
The rotating shaft provided with the bevel gear (188) that meshes with the bevel gear (187) provided on the screen is rotated, and the ball screw of the similar structure (not shown) is also rotated to rotate the screen vertical guide (190). Along with this, the screen base (142) descends from the position shown in FIG. 15 to the printing position shown in FIG.

After that, the printing operation of the paste solder (178) on the substrate (20) by the movement of the squeegee (175) is performed. This printing operation will be described.

The print motor (168) is rotated, and the squeegee base (167) is moved from the original position to the position immediately before the substrate (20) via the drive pulley (170), the driven pulley (171) and the squeegee belt (172). It stops as shown in FIG.

Next, as shown in FIG. 21, the squeegee (1
44) is lowered by the operation of the cylinder (177),
The print motor (168) rotates and the squeegee table (167) moves, so that the squeegee (175) moves to the position of FIG. 22 while printing the paste solder (178) on the substrate (20).

Thus, the printing of the paste solder (178) on the printed circuit board (20) is completed.

Next, the descending right squeegee (17
5) rises as shown in FIG. 23 and moves to the position shown in FIG. At this time, the print counter (240) counts "1".

Next, the screen up / down motor (180) rotates, the screen base (142) rises, and the screen plate (144) rises up from the substrate (20) to the position shown in FIG.

Next, X for mounting the printed circuit board (20)
The -Y-θ table (87) is set to a position where the substrate (20) can be discharged by moving in the Y direction and rotating in the θ direction, and moved to the discharge conveyor section (8) side by rotating the X motor (94). Then, the discharge side gear (32) is engaged with a gear (not shown) of the discharge conveyor section (8) in the same manner as in the supply conveyor section (2).

Then, the chuck rail (23) is opened,
The substrate (20) is released, the backup pin (41) moves downward, and the substrate (20) is placed on the chuck belt (30). Then, when the discharge conveyor unit (8) starts to rotate, the chuck belt (30) conveys the substrate (20) and transfers it onto the discharge conveyor unit (8), and the discharge conveyor unit (8) transfers the substrate (20). 20) is discharged to a downstream device.

Then, the X-motor (94) is rotated to move the X-
The Y-θ table (87) moves to the supply conveyor section (2) side, and the supply side gear (31) engages with the transmission gear (63) of the supply conveyor section (2) as described above. Then, the supply side motor (49) is rotated and the supply belt (57) conveys the next substrate (20) to transfer the substrate (20) onto the chuck belt (30).

Then, in the same manner as described above, the substrate (20) is fixed and positioned below the screen plate (144). Then, the screen plate (144) descends, the paste solder (178) is printed by the squeegee (175), and the print counter (240) is incremented to "2".

After that, the substrate (20) is discharged, and the same operation as described above is performed for printing the next substrate (20).

In this way, the number of prints on the substrate (20) is counted by the print counter (240) and the NC data “AUTO” is counted.
After "10" (10 sheets) set in "MATIC CLEANING INTERVAL", the board (2
0) is discharged by the discharge conveyor unit (8), an automatic cleaning operation of the lower surface of the screen plate (144) is performed. The print counter (240) is cleared to "0" when the set value is reached. This automatic cleaning operation will be described.

When the substrate (20) printed as described above is discharged, the XY-θ table (87) moves to the supply conveyor section (2) side by the rotation of the X motor (94), It stops at the position detected by the table standby position detection sensor (118). The detection sensor (118) is X
After detecting the -Y-θ table (87), the cleaning unit (192) causes the cleaning unit motor (195).
By the rotation of the belt (194) by the rotation of (1), the belt (194) moves below the screen plate (144) along the X guide rail (93).

Next, the roller up-and-down cylinder (218) is actuated, the arm (217) swings upward with the support shaft (216) as a fulcrum, and the roller (202) around which the cleaning paper (199) is wound becomes the screen plate. (144) A spring (2
20) Abuts in a state of being urged. Laura (20
2) moves up and the cleaning unit motor (195) rotates while the cleaning paper (199) is in contact with the screen plate (144), the roller (202) runs, and the cleaning paper (199) moves to the screen plate. The lower surface of (144) is wiped off.

When the motor (195) is stopped, the cleaning paper (199) wound around the roller (202).
Rotates the take-up motor (205) to wind the take-up roll (2
It is wound up in 03). The cleaning paper (199) is supplied from the supply roll (200), and while rotating the paper feed detection roll (201) without slipping, the roller (2
It is wound on the winding roll (203) via
When the sensor (213) detects the slit (212) of the disk (211) attached to the end of the paper feed detection roll (201) and detects that the set feed amount has been fed, the take-up motor ( The rotation of (205) is stopped. And
The roller upper and lower cylinders (218) are actuated and the arm (21
7) swings downward, and the roller (202) separates from the lower surface of the screen plate (144).

Next, the cleaning unit motor (195) is rotated, and the cleaning unit (192) is moved to the discharge conveyor unit (8) side to detect the cleaning origin sensor (198).
Move to the position detected by. Thus, when the automatic cleaning operation is completed, the cleaning counter (2
41) counts the number of times of automatic cleaning "1".

While the cleaning operation is being performed, the next substrate (20) is supplied from the supply conveyor section (2) onto the chuck belt (30) and the chuck rail (2).
Although it is gripped and fixed in the same manner as described above by 3), the automatic cleaning operation is completed and the cleaning origin detection sensor (198) is replaced by the cleaning unit (19).
2) is detected, the XY-θ table (87) moves along the X guide rail (93) to the screen plate (14).
4) Move downward to position the substrate (20),
The paste solder (178) is printed in the same manner as described above.

The above-described operation is repeated and the cleaning counter (241) indicates that the NC data "AUTOMATI".
"1" set to "C CLEANING COUNT"
When the number becomes 2 "(12 times), an operation for manually cleaning is performed.

That is, when the cleaning counter (241) becomes "12" and the cleaning unit (192) moves and is detected by the cleaning origin detection sensor (198), the CPU (229) causes the interface (232).
The relay (260) is activated via the relay contact (2
61) is closed.

The screen up / down cylinder (164) operates while the connecting plate (150) is engaged with the engagement bolt (159) to integrally connect the squeegee mount (149) and the screen mount (145). Then, the space between the screen plate (144) and the screen base (142) is opened as shown in FIG. 17, and the cleaning counter (241) is cleared. After this, the power is turned on, but the CPU (22
The drive command is not output from 9), all the motors and cylinders are not driven, and the current position is maintained. in this case,
The next substrate (20) is fixed to the chuck (5) and the substrate (2)
It is assumed that the recognition by the recognition camera (12) of 0) has been completed. Then, the yellow lamp of the tower light (16) blinks, and the operator manually operates the screen plate (144).
Notify that the lower surface needs to be cleaned.
At this time, the screen of the CRT (233) also indicates that it is in a standby state for cleaning the manual screen plate (144).

Next, when the worker comes and opens the safety door (17), the door opening / closing switch (18) is opened, but the relay contact (261) is closed, so the relay (260).
Keeps operating and supplies power (2) to the drive circuit (239).
The connection of 65) is also maintained.

The CPU (229) as a control means does not issue a command to drive the motor and the cylinder, but the rotation position of each motor and the state of each cylinder are RAM (230).
It is stored in.

At this time, even if each motor is in a stopped state, the pulse motor is excited and therefore has a force for holding the current rotation position. In the case of the servo motor, if the operator touches the movable part of the motor. However, even if an external force for rotating the motor is applied, the drive circuit (239) drives the motor so as to maintain the position instructed by the CPU (229), so that the current rotation position is also to be maintained.

The operation section (15) does not accept any operation other than checking the CRT screen, turning off the power, or the PB key (268). In this state, the operator manually wipes and cleans the lower surface of the screen plate (144).

When the cleaning is completed, the worker closes the safety door (17) and then presses the PB key (268).
When the safety door (17) is closed, the door opening / closing switch (18) is closed, and then the PB key (268) is pressed, so that the CPU (229) detects that the manual cleaning is completed. The relay contact (261) is opened and the relay (260) is deactivated.
Relay (262) remains energized and contacts (26
6) keeps closed. In addition, the PB key (26
8) is pressed, the CPU (229) causes the operation unit (1)
The operation of 5) will be accepted.

After that, when the start key (255) is pressed, the CPU (229) detects the completion of the manual cleaning by pressing the PB key (268), and therefore the screen vertical cylinder (164). To activate the screen plate (144) and the screen base (142)
To the state shown in FIG. However, the substrate (20)
There is no. Then, the XY-θ table (8
7) moves to the lower side of the screen plate (144), the positioning is performed as described above, and the printing operation is performed.

The above-described operation is repeated, but if the safety door (17) is opened for some reason during this normal operation, the switch (18) is opened and the relay contact (26) is opened.
Since 1) is also in the open state, the relay (262) is demagnetized. Then, the relay contact (263) is opened, the operation of the electromagnetic contactor (264) is stopped, the contact (266) is opened, and the connection between the drive circuit (239) and the power supply (265) is cut off.

In this way, when the drive circuit (239) is de-energized, each motor and cylinder are stopped, and the excitation is cut off in the case of the pulse motor, and the excitation is cut off in the case of the servo motor. Since the drive circuit (239) for holding the rotation position does not work, the recognition camera (12), the cleaning unit (192) or the squeegee (17) driven by those motors.
When a worker touches a movable part such as 5), the movable part moves, and the motor changes its rotational position.

Not only the motor such as a pulse motor having no encoder circuit for detecting the rotational position, but also the servo motor having an encoder circuit, the drive circuit is de-energized so that the encoder circuit is de-energized. Therefore, the CPU (229) cannot detect the rotation position. Therefore, when the worker takes some action and the safety door (17) is closed, the origin return operation of each motor and cylinder is performed.

Therefore, first, the manual key (253) is pressed and the cursor (258) is moved on the MANUAL SELECTION screen of FIG. 29 to return the RETURN OPE.
When the operation key (256) is pressed in accordance with the ration, the origin return operation of each motor and cylinder is performed.
Then, press the automatic key (254) to start the start key (25
When 5) is pressed, the printed circuit board (20) is conveyed to the supply conveyor section (2) and the above-described printing operation is performed.

The above operation is repeated, but the cleaning paper (199) is wound around the winding roll (203) and the paper ((200) wound around the supply roll (200) each time the automatic cleaning operation is performed. The winding diameter of 199) gradually decreases. When the winding diameter of the paper (199) of the supply roll (200) is reduced, the actuator (222) is urged by the spring (225) so that the support shaft (223).
27, the notice switch (226) is turned “ON” at the position of the chain double-dashed line shown in FIG. 27 to output a paper-out notice signal.

The CPU (229) turns on the yellow lamp of the tower lamp (16) in accordance with the paper-out warning signal and displays the paper-out warning display on the screen of the CRT (233). Then, the available number of times of automatic cleaning "5" is set in the paper out notice counter (242). After that, unless the paper is replaced, the counter (242) is decremented for each automatic cleaning. At this time, the counter (24
The possible number of times stored in 2) may be displayed on the screen of the CRT (233). 5 after the paper is run out
When the automatic cleaning is performed once and the counter (242) becomes "0", the yellow lamp of the tower lamp (16) blinks and the printing operation is stopped.

Then, an operation for exchanging the cleaning paper (199) similar to the operation for manually cleaning is performed.

That is, when the counter (242) becomes "0", the CPU (229) actuates the relay (260) to close the relay contact (261), and at the same time as in the case of manual cleaning. Board (14
4) and the screen base (142) are opened, the cleaning unit (192) is moved to a predetermined position where paper replacement is easy, and the cleaning roller (202) is moved to the cylinder (218) to facilitate paper replacement. Is raised by the operation of. If there is a position where the paper can be exchanged without raising the screen plate (144), it may be moved to that position and the screen plate (144) may not be raised. At the same time, a paper out display is displayed on the screen of the CRT (233).

Next, when the worker comes and opens the safety door (17), the door opening / closing switch (18) is opened, but the relay contact (261) is closed, so that the drive circuit (23) is opened.
The power supply (265) to 9) is also maintained, and each motor and cylinder is stopped at each predetermined position as in the case of manual cleaning.

At this time, similarly to the case of the manual cleaning, each motor tries to hold the stop position, and the operation of the operation unit (15) is performed by checking the CRT screen, P
Nothing can be accepted except the B key (268) or power off.

After the replacement of the cleaning paper (199), the worker closes the safety door (17) and then presses the PB key (268). Then, the CPU (229) detects the end of paper exchange, stops the operation of the relay (260), the relay contact (261) is opened, and the operation of the operation unit (15) is accepted.

After that, when the start key (255) is pressed, the cleaning roller (202) moves to the cylinder (21
When the cleaning unit (19)
2) moves to the position detected by the cleaning origin detection sensor (198), the screen plate (144) is closed with respect to the screen base (142), and the printing operation as described above is continued.

In the present embodiment, the CPU (229) determines the timing of manual cleaning when the automatic cleaning is performed a set number of times. May be printed when a set number of times have been printed.

Alternatively, the above timing may be set to a time when a set time elapses from the time when the power is turned on or the time when printing is first performed after the power is turned on, and thereafter, the timing of the manual cleaning is set at each set time. You may make a judgment.

Alternatively, a fixed time every day may be set as the above-mentioned timing, or the operator may select which of the above-mentioned judgments is to be made by the changeover switch or at the time of setting.

Further, in the case of this embodiment, the safety door (17) is provided after the manual cleaning or the paper replacement is completed.
If the PB key (268) is pressed before the
The CPU (229) detects this and stops the operation of the relay (260), the relay contact (261) is opened and the drive circuit (239) is cut off by the power source (265), but the switch (18) The CPU (229) can detect the opening and closing of the safety door (17) by opening and closing the safety door (17).
(229) can be detected so that the pressing of the PB key (268) can be accepted only after the safety door (17) is closed.

Alternatively, the CPU (22) indicates that the safety door (17) is closed regardless of the pressing of the PB key (268).
If 9) is detected, it is judged that the cleaning or the paper replacement is completed, and the operation unit (15) can be accepted.
The operation of the relay (260) may be stopped.

In this embodiment, the CPU (229) actuates the relay (260) when a manual cleaning is to be performed or when the cleaning paper (199) is replaced. If it is necessary to open the safety door (17) during the automatic operation of the printing machine to perform the work, the CPU (229) is required before the work
May activate the relay (260).

Further, not only the screen printing machine but also a safety door is provided so that when the door is opened, the supply of power to the drive source such as the motor for driving the movable part of the apparatus is stopped. For devices such as a device that mounts electronic components on a printed circuit board and a device that applies adhesive to temporarily fix electronic components to the printed circuit board, work performed by the operator by opening the safety door during automatic operation If there is any, especially if it is a work to be performed on a regular basis, a circuit such as the relay (260) of this embodiment is provided so as to supply power to the drive source even if the safety door is opened. can do.

Furthermore, the relay (260) of this embodiment.
And the relay contact (261) instead of the relay contact (261).
A switch for manually opening and closing may be provided at the position 1) so that power is supplied even when the safety door is opened.

Further, in the present embodiment, the drive circuit (239)
For the sake of convenience, the circuit is shown to be common to all the motors and cylinders. However, when the drive circuits that drive the motors and cylinders are independent, the connection line from the power supply to each drive circuit has contacts (266 ), The drive circuit side may be connected to each drive circuit in parallel.

[0109]

As described above, according to the present invention, the power source is supplied to the drive source even when the safety door is opened when the screen plate is manually cleaned, and the screen plate is manually cleaned. Since the position of the movable part is held, the movable part does not easily move due to contact with the operator, and the printing operation can be started immediately after the cleaning work is completed. This reduces the troublesome work and improves the operating rate of the screen printing machine.

[Brief description of drawings]

FIG. 1 is a control block diagram of the present invention.

FIG. 2 is a front view of a screen printing machine to which the present invention is applied.

FIG. 3 is a plan view of the printing machine with a safety door removed.

FIG. 4 is a front view of the printing machine with a safety door removed.

FIG. 5 is a side view of the chuck.

FIG. 6 is a front view of a chuck.

FIG. 7 is a front view of a supply conveyor unit and a chuck.

FIG. 8 is a plan view of a supply conveyor unit and a chuck.

FIG. 9 is a front view of a chuck positioning unit.

FIG. 10 is a front view showing a scene where the lock lever is released.

FIG. 11 is a plan view showing an XY-θ table.

FIG. 12 is a plan view of a recognition camera driving unit.

FIG. 13 is a front view of a recognition camera driving unit.

FIG. 14 is a plan view of a printing unit.

FIG. 15 is a front view of a printing unit.

FIG. 16 is a front view of a printing unit.

FIG. 17 is a front view of a printing unit.

FIG. 18 is a side view of the printing unit.

FIG. 19 is a side view of the printing unit.

FIG. 20 is a front view showing a printing operation.

FIG. 21 is a front view showing a printing operation.

FIG. 22 is a front view showing the printing operation.

FIG. 23 is a front view showing the printing operation.

FIG. 24 is a front view showing a cleaning unit.

FIG. 25 is a front view in which a cleaning unit is cut away.

FIG. 26 is a plan view of the cleaning unit.

FIG. 27 is a front view of the cleaning unit for explaining the operation of giving notice of running out of paper.

FIG. 28 is a diagram showing a CRT screen.

FIG. 29 is a diagram showing a CRT screen.

[Explanation of symbols]

 17 Safety Door 18 Door Open / Close Switch (Door Switch) 20 Printed Circuit Board 144 Screen Board 175 Squeegee 178 Paste Solder (Coating Agent) 260 Relay (Cleaning Switch) 261 Relay Contact (Cleaning Switch) 262 Relay (Power Supply Circuit) 263 Relay Contact (power supply circuit) 264 Electromagnetic contactor (power supply circuit) 265 Power supply 266 Contact (power supply circuit)

Claims (1)

(57) [Claims] 1. A screen printing machine for applying a coating material on a screen board to a printed board by moving a squeegee through the screen board, and a safety door capable of shielding a movable part of the printing machine from an operator, and the safety door. If the door switch that operates when the door is closed, the cleaning switch that operates when performing manual cleaning of the screen plate, and either the door switch or the cleaning switch are in the operating state A power supply circuit capable of supplying power to the drive source of the movable part, and a control means for controlling to hold the position of the movable part when performing manual cleaning of the screen plate are provided. Screen printing machine.