JP6803669B2 - Screen printing machine - Google Patents

Description

The present invention relates to a screen printing machine that prevents an operator working in the machine from touching the cream solder adhering to the squeegee.

In the screen printing machine, the substrate carried in by the transport device is held and placed at the printing position under the mask, and then the cream solder is printed on the substrate from the upper side of the mask through the printing pattern (through hole) by the squeegee. At that time, the cream solder is pushed into the print pattern while rolling on the mask by the squeegee, but the cream solder adheres to the squeegee after use and remains, and the cream solder drips like an icicle, and further. It will drip down. Then, the cream solder will reach the operator during the setup change and maintenance in the machine. In order to prevent the cream solder from adhering to the operator, it is necessary to remove the cream solder adhering to the squeegee, but the removal work is very troublesome, and it is also necessary to remove the squeegee holder to which the squeegee is attached.

Japanese Unexamined Patent Publication No. 06-210827

For example, Patent Document 1 below discloses a screen printing machine in which a receiving plate that can be moved below the squeegee by a cylinder is provided so that a coating agent falling from the squeegee can be received. However, in the backing plate structure of Patent Document 1, since the backing plate is taken in and out by using a driving means such as a cylinder, the structure becomes complicated and the cost increases. Moreover, since the backing plate receives the cream solder falling from the squeegee downward, it is not configured to avoid contact between the squeegee on which the cream solder has adhered and the operator. In other words, for workers who work in the machine, the problem of cream solder adhering cannot be solved.

Therefore, an object of the present invention is to provide screen printing that prevents an operator from touching the cream solder adhering to the squeegee in order to solve such a problem.

In the screen printing machine according to the present invention, cream solder is rolled by a squeegee device on the upper side of a mask in which a printing pattern composed of a plurality of through holes is formed, and cream solder is printed on a substrate arranged under the mask. The squeegee device has a squeegee cover that surrounds the squeegee on the side surface side and the lower surface side, and an opening is provided on the side surface portion of the squeegee cover that surrounds the squeegee on the side surface side. It was printed .

According to the screen printing of the present invention, the cream solder is rolled by the squeegee on the upper side of the mask, printing is performed on the substrate under the mask, and the cream solder adheres to the squeegee due to the repeated printing process, but the squeegee cover is formed. By surrounding the squeegee from the side surface side to the lower surface side, it is possible to prevent the operator from touching the cream solder adhering to the squeegee.

It is a figure which showed the internal structure of 1st Embodiment of a screen printing machine simply. It is a perspective view which showed the squeegee head which attached the squeegee cover. It is a longitudinal side view of the squeegee head which attached the squeegee cover. It is a perspective view which showed the squeegee cover. It is a side view which showed the modification of the squeegee device simply. It is a side view which showed the other modification of the squeegee device simply. It is a figure which showed the internal structure of the 2nd Embodiment of a screen printing machine simply. It is a figure which showed the internal structure of the 2nd Embodiment of a screen printing machine simply.

Next, an embodiment of the screen printing machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a diagram simply showing the internal structure of the screen printing machine of the present embodiment. The screen printing machine 1 is configured to form a pre-process of a component mounting machine for mounting electronic components on a substrate 10. The screen printing machine 1 is provided with a substrate transfer device 3, a squeegee device 4, a clamp device 5 for gripping the substrate, an elevating device (not shown) for positioning the substrate in the vertical direction, and the like. Then, a control device for controlling the entire screen printing machine is mounted, and predetermined control for the drive unit of each device is performed.

In the screen printing machine 1, the substrate 10 is carried in and out by the substrate transport device 3, and the substrate transport device 3 is composed of a pair of conveyor belts 11 that support both sides of the substrate 10, and is a drawing of FIG. The substrate 10 is fed in the direction of penetrating (the width direction of the machine body). The substrate transfer device 3 is provided in a clamp device 5 that holds the substrate 10, and is configured to be able to move up and down by an elevating device (not shown). In the clamp device 5, side frames 13 and 14 are arranged in pairs in front of and behind the table 12, and a ball screw mechanism in which a screw shaft is screwed into an internal fixing nut is configured on one side frame 14, which is not shown. The distance from the side frame 13 can be adjusted by the rotation of the clamp motor.

Clamp portions 15 are formed at the upper ends of the side frames 13 and 14, and the substrate 10 can be gripped by the distance between them. A conveyor belt 11 is attached to the lower side of the clamp portion 15 on the side frames 13 and 14, and a substrate transport device 3 for transporting the substrate 10 between the side frames 13 and 14 is configured. A backup mechanism is provided between the side frames 13 and 14. The backup mechanism has a configuration in which a plurality of backup pins 18 are attached to a backup table 17 so as to avoid electronic components mounted on the board 10, the backup table 17 is supported by a guide rod 19, and can be raised and lowered by a backup lifting device. It has become. The entire clamp device 5 including the backup mechanism is also configured to be able to move up and down by a lifting device (not shown).

Above the clamp device 5, a mask 8 having a printed pattern composed of a plurality of minute through holes is installed. The mask 8 is attached to the rectangular frame 801 in a stretched state, and is installed in the machine via a mask holder. A squeegee device 4 for spreading the cream solder is provided above the mask 8. In the squeegee device 4, a pair of squeegee heads 21 and 22 having a squeegee 32 are fixed to the lower ends of the piston rods of cylinders 23 prepared for each, and are suspended in a state where they can be raised and lowered.

The two cylinders 23 are mounted on one traveling table 25, and the traveling table 25 is slidably assembled with respect to a guide rod 26 erected in the horizontal direction (front-back direction of the machine body) in the drawing, and moves linearly in the horizontal direction. Is configured to be possible. Further, a screw shaft (not shown) parallel to the guide rod 26 is erected on the screen printing machine 1 in a rotatable state, and rotation is given by a drive motor. The pedestal 25 has a ball screw mechanism composed of an internal fixing nut and a screw shaft, and can move along the guide rod 26 under the control of a drive motor.

In the screen printing machine 1 having the above configuration, when the substrate 10 is carried between the side frames 13 and 14 by driving the conveyor belt 11, the backup table 17 is raised and pushed up to the backup pin 18. The substrate 10 is lifted from the conveyor belt 11. Then, as the side frame 14 moves, the substrate 10 is sandwiched and gripped by the clamp portions 15 of the pair of side frames 13 and 14, and the entire clamping device 5 holding the substrate 10 rises to raise the mask. Printing is possible on the substrate 10 located directly under 8.

After that, on the upper side of the mask 8, the supplied cream solder is pushed into the print pattern while being rolled on the mask 8 by the squeegee device 4. In the screen printing machine 1, one of the corresponding squeegee heads 21 and 22 is lowered by the drive of the cylinder 23 according to the moving direction of the reciprocating traveling table 25, and the cream solder is spread by the squeegee 32. As a result, the cream solder is printed on the substrate 10 located under the mask 8 through the printing pattern.

The cream solder printed on the substrate 10 in this way has viscosity. Therefore, the cream solder adheres to the squeegee 32 by the repeated printing process, and when the squeegee 32 rises, the cream solder drips. The worker needs to change the setup of the backup pin 18 in accordance with the change in the production content, and in such a case, he / she has to put his / her hand in the machine to perform the work. However, as it is, as described in the above-mentioned problem, the worker touches the cream solder dripping from the squeegee 32, and even if he / she is careful, the dripping cream solder reaches the worker. Therefore, the screen printing machine 1 of the present embodiment is provided with a removable squeegee cover 28 so that the operator can perform the work without touching the cream solder adhering to the squeegee 32.

In FIG. 1, the left side of the drawing is the front side of the screen printing machine 1. The worker stands on the front side of the machine, opens the opening / closing cover, and puts his / her body in the work. Therefore, the squeegee cover 28 is attached to the squeegee head 21 on the left side of the drawing, that is, on the front side of the machine body, which is the standing position of the operator. Here, FIG. 2 is a perspective view showing the squeegee heads 21 and 22, and the attached squeegee cover 28 is shown by a chain line. Further, FIG. 3 is a side view in the longitudinal direction of the squeegee heads 21 and 22, and the squeegee cover 28 is shown in the AA cross section of FIG. FIG. 4 is a perspective view showing a specific example of the squeegee cover 28.

First, the pair of squeegee heads 21 and 22 are configured in the same manner and are arranged symmetrically in the front-rear direction of the machine body, which is the moving direction of the traveling table 25. The squeegee heads 21 and 22 are attached to a rod-shaped base 31 having a long dimension in the width direction of the machine body so that the squeegee 32, which is a strip-shaped plate material, protrudes downward. At that time, the squeegees 32 are fixed in a posture of leaning forward in the opposite direction, that is, in each traveling direction. Then, in the squeegee heads 21 and 22, the L-shaped hook 33 is fixed to the upper surface of the base 31, and the hook 33 is interposed with respect to the connecting member 24 (see FIG. 1) fixed to the lower end of the piston rod 23 of the cylinder. It can be attached and detached. Further, a rail 35 is fixed to the base 31 in the longitudinal direction, and a paste doctor 36 for preventing the cream solder from protruding is inserted from both sides and bolted.

By the way, guide blocks 37 are fixed to both ends of the upper surface of the base 31, and substantially fan-shaped swinging members 38 integrally formed with the squeegee 32 are fitted therein. By sliding the arc portion with respect to the guide block 37, the swing member 38 makes it possible to adjust the tilt angle of the squeegee 32 by swinging it around the lower end thereof. Further, the guide block 37 is provided with a fastening member 39 with a screw for restraining the swing member 38, and the inclination angle of the squeegee 32 can be adjusted by tightening the screw.

Next, as shown in FIG. 3, the squeegee cover 28 is formed so as to surround the squeegee heads 21 and 22 from above to the sides and downward. As shown in FIG. 4, the squeegee cover 28 formed of the thin plate has two mounting portions 41 formed in the width direction in accordance with the guide blocks 37 at two locations of the squeegee head 21, and further inclined side surface portions 42 and the like. The lower receiving portion 43 is formed.

In the mounting portion 41, a hook portion 45 cut out in a U shape is formed at the tip of a horizontal surface, and a magnet 46 is fixed inside the vertical surface. On the other hand, the fastening member 39 of the squeegee head 21 has a neck portion 392 between the knob 391 and the screw portion 393, and an annular hook groove 395 is formed in the neck portion 392. Therefore, the hooking portion 45 of the squeegee cover 28 is fitted into the hooking groove 395, and at this time, the magnet 46 is attracted to the metal guide block 37. The squeegee cover 28 is adapted to maintain the attached state shown in FIGS. 2 and 3 by being hooked on the squeegee head 21 by the hooking portion 45 and being attracted by the magnet 46.

The squeegee cover 28 has a large notch between the two mounting portions 41 in the width direction toward the side surface portion 42, and an opening 47 is formed so that the operator can visually recognize the squeegee head 21 at the time of mounting. .. A receiving portion 43 is formed at the tip of the inclined side surface portion 42 so that the receiving portion 43 is horizontally arranged directly under the squeegee 32 when attached. The receiving portion 43 is formed with an inclined tapered portion 48 at the tip portion in order to facilitate scooping of cream solder like dustpan. Further, wall portions 49 are formed on both edges of the squeegee cover 28 in the width direction to ensure the rigidity of the cover shape formed of the thin plate and to prevent the cream solder from spilling laterally.

Such a squeegee cover 28 is usually removed from the screen printing machine 1 and stored, but is attached to the squeegee head 21 when performing work such as setup change or maintenance. Since the attached squeegee cover 28 surrounds the squeegee heads 21 and 22 from the operator side, even if cream solder adheres to the squeegee 32, the operator who puts his / her hand in the machine and works touches the cream solder. Can be avoided. In addition, it is possible to drip fell cream solder receive so as not to arrive to the operator. Therefore, the working environment in the machine is improved, and the worker can proceed with the work without being bothered by the dripping or dripping cream solder. Further, until now, the work of removing the cream solder from the squeegee 32 has been performed before the setup change, but by omitting the work of removing the cream solder, the downtime of the screen printing machine 1 can be shortened.

The squeegee cover 28 can be mounted by simply fitting the hooking portion 45 of the squeegee cover 28 into the hooking groove 395 of the squeegee head 21 and attracting the magnet 46 to the guide block 37. The removal can be done easily as well. Further, at the time of mounting, since the hooking portion 45 may be aligned with the hooking groove 395, it is easy for the operator to see and positioning is very easy. Since the squeegee cover 28 is formed with a large opening 47, the squeegee cover 28 can be attached by scooping out the dripping cream solder while checking the tip portion (tapered portion 48) of the squeegee 32. It is preferable that the screen printing machine 1 is provided with an interlock sensor for the squeegee cover 28. This is because the drive unit of the screen printing machine 1 can be prevented from operating while attached to the squeegee head 21, and the squeegee cover 28 can be prevented from being forgotten to be removed.

By the way, the squeegee cover 28 functions as a cover for preventing the operator from coming into contact with the cream solder as described above, but it can also be applied to the use as a transport cover. FIG. 5 is a side view simply showing a modified example of the squeegee device showing the use of such a squeegee cover. In this squeegee device 50, as in the above embodiment, two cylinders 52 are mounted on a traveling table 51 that can move in the front-rear direction of the machine body, and a pair of squeegee heads 55 and 56 having a squeegee 53 are each cylinder. It is fixed to a piston rod extending downward from 52.

Then, in the squeegee device 50, an elevating plate 57 is horizontally fixed to the squeegee heads 55 and 56 so as to project in the front-rear direction (left-right direction in the drawing), respectively, and further, in the vertical direction which is the elevating direction. The upright side shaft 58 is fixed. On the other hand, the support block 59 is horizontally fixed to the traveling table 51 so as to protrude in the front-rear direction of the machine body, and the side shaft 58 penetrates through the bush 61 fitted therein. The two side shafts 58 are formed with annular hook grooves 63 and 64 at two upper and lower positions into which the hook portions of the squeegee cover 280 (see “hanging portion 45” shown in FIG. 4) are fitted. ing. The squeegee cover 280 is formed in substantially the same shape as the squeegee cover 28 shown in FIG. 4, but is mounted on the horizontal surface of the mounting portion 410 so as to be hooked on the two side shafts 58. A change has been made to lengthen the dimensions of the notched U-shaped hook.

Therefore, in the squeegee device 50, the corresponding squeegee head 55 or 56 is lowered according to the traveling direction of the traveling table 51, and the cream solder is spread by the squeegee 53. When the squeegee heads 55 and 56 move up and down, the respective raising and lowering plates 57 and the side shafts 58 move up and down as a unit. The squeegee cover 28 is removed from the squeegee device 50 during such a printing process, but is attached when work in the machine such as setup change or maintenance is performed. At the time of mounting, the squeegee heads 55 and 56 are in the raised position as shown in the figure, and the squeegee cover 28 is fitted into the two hooking grooves 63 located on the lower side as shown by the alternate long and short dash line. Then, the magnet 46 is attracted to the metal block 65 fixed to the lower surface of the elevating plate 57.

Further, the squeegee cover 280 can be attached as shown by a solid line. That is, the hooking portion of the mounting portion 410 is fitted into the two hooking grooves 64 located on the upper side, and the magnet 46 is attracted to the metal support block 59. In such a second mounting state, the lowering of the side shaft 58 is restricted, so that the lowering of the squeegee heads 55 and 56 is also restricted, and the movement of the squeegee device 50 is stopped. Therefore, in this embodiment, the squeegee cover 280 can be mounted in two patterns, and when the squeegee cover 280 is hooked on the lower hook groove 63, the operator does not touch the cream solder adhering to the squeegee 53 in the machine. You can proceed with the work. Further, when hooked on the upper hook groove 64, the squeegee cover 280 can stabilize the state of the squeegee device 50 when the screen printing machine is conveyed or moved.

Next, the squeegee cover 28 can also be used as a recovery plate for cream solder. FIG. 6 is a side view simply showing another modification of the squeegee device showing the use of such a squeegee cover, and the solder recovery steps are shown step by step in (A) to (E). In this squeegee device 70, as in the above embodiment, two cylinders 52 are mounted on a traveling table 51 that can move in the front-rear direction of the machine body, and a pair of squeegee heads 55 and 56 provided with the squeegee 53 are each cylinder 52. It is fixed to a piston rod that extends downward from. Then, the cover cylinder 71 is fixed to the squeegee head 55 located on the front side of the machine body in a horizontal posture, the piston rod protrudes toward the front side of the machine body (left side in the drawing), and the squeegee cover 28 is removable at the tip portion. It is attached with.

In the normal squeegee device 70, the squeegee cover 28 is removed, and as described above, the squeegee 53 performs a printing process of spreading the cream solder on the mask 8. On the other hand, when the screen printing machine is to be set up or maintained, the squeegee cover 28 is attached to the cover cylinder 71. Therefore, as shown in FIG. 6A, the squeegee covers 28 surround the squeegee heads 55 and 56, making it easier for the operator to perform the work in the machine.

Further, in the present embodiment, when the cream solder remains on the mask 8 to be replaced, the cream solder 100 can be recovered by the squeegee device 70. First, as shown in FIG. 6B, the squeegee head 55 and the squeegee cover 28 are integrally lowered with the cover cylinder 71 extended. The squeegee cover 28 is formed with long holes long in the vertical direction, and the piston rod of the cover cylinder 71 is connected thereto. Therefore, as shown in FIGS. 6B to 6C, after the squeegee cover 28 descends and comes into contact with the mask 8, the squeegee head 55 descends within the range of play of the elongated hole (not shown), so that the mask 8 is moved. The squeegee cover 28 can be brought into close contact without bending.

Next, as shown in FIG. 6C, the squeegee device 70 descends to a position where the squeegee cover 28 comes into contact with the mask 8 with the cover cylinder 71 extended. Then, the squeegee head 56 side is lowered and the squeegee 53 is arranged with respect to the cream solder 100. After that, as shown in FIG. 6D, the cover cylinder 71 contracts and the cream solder 100 supported by the squeegee 53 is placed on the squeegee cover 28. Then, as shown in FIG. 6E, both cylinders 52 contract and the squeegee heads 55 and 56 and the squeegee cover 28 rise, so that the cream solder 100 remaining on the mask 8 can be recovered.

Subsequently, a second embodiment of the screen printing machine will be described. FIG. 7 is a diagram simply showing the internal structure of the screen printing machine of the second embodiment. The screen printing machine 80 has a configuration in which substrate devices 82 and 83 are provided below the mask 81 at two locations so that cream solder can be collected on the mask 81. The substrate devices 82 and 83 perform positioning by loading and unloading the substrate, holding the substrate, and raising and lowering the substrate. On the other hand, above the mask 81, a squeegee device 84 is provided as in the above embodiment, and a pair of squeegees 841, 842 can be raised and lowered. The first solder recovery device 85 and the second solder recovery device 86 are provided so as to sandwich the squeegee device 84 from the front-rear direction (horizontal direction in the drawing) of the machine body.

The squeegee device 84, the first solder recovery device 85, and the second solder recovery device 86 are configured such that a common screw shaft 87 is screwed into each internal nut and simultaneously moves in the front-rear direction of the machine body by the rotation of the drive motor 88. ing. Further, the squeegee device 84 and the first solder recovery device 85 are each provided with a moving motor 843,853, and can be moved independently by giving rotation to the internal nut via the rotation transmission mechanism 845,855. It has become. Further, in the first solder recovery device 85 and the second solder recovery device 86, the recovery plates 91 and 92 are attached so as to be able to move up and down by a built-in cylinder.

The recovery plate 92 on the rear side of the machine body is formed of a tapered plate material, but the recovery plate 91 on the front side of the machine body is formed in the same shape as the squeegee cover 28 shown in FIG. That is, the squeegees 841,842 (specifically, the squeegee head) are formed so as to be able to be surrounded from the front side of the machine body, and the lower receiving portion 43 and the tapered portion 48 shown in FIG. 4 recover the solder in the same manner as the recovery plate 92. It is designed to perform its function.

Therefore, in this screen printing machine 80, during the printing process of rolling the cream solder in one direction, the cream solder is placed on the recovery plates 91 and 92 before and after printing. Therefore, the squeegees 841, 842 at the time of printing first come into contact with the collection plates 91 and 92 and descend so as not to come into contact with the mask 81. Therefore, it is possible to suppress the bending of the mask 81 without supporting it from below. Further, since the squeegee 842 rides on the recovery plate 91 at the end of printing, the substrate can be immediately lowered without waiting for time.

In addition to the solder recovery function, the recovery plate 91 covers the squeegees 841,842 by bringing the first solder recovery device 85 close to the squeegee device 84 and raising the recovery plate 91, as shown in FIG. Can be done. Therefore, as in the first embodiment, the recovery plate 91 as the squeegee cover allows the operator to proceed with the work in the machine without touching the cream solder adhering to the squeegees 841 and 842.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the U-shaped hook portion 45 is fitted into the annular hook groove 395 or the like as the hook structure of the squeegee cover 28, but the posture when the squeegee cover 28 is mounted can be maintained. Any other configuration may be used as long as it is suitable.
Further, the shape of the squeegee cover is not limited to that shown in FIG.

1 ... Screen printing machine 4 ... Squeegee device 5 ... Clamping device 8 ... Mask 10 ... Substrate 21, 22 ... Squeegee head 23 ... Cylinder 25 ... Running platform 28 ... Squeegee cover 37 ... Guide block 39 ... Fastening member 41 ... Mounting part 42 ... Side surface 43 ... Receiving part 45 ... Hooking part 46 ... Magnet 47 ... Opening 48 ... Tapered part 395 ... Hooking groove

Claims (8)

In a screen printing machine in which cream solder is rolled by a squeegee device on the upper side of a mask in which a printing pattern consisting of a plurality of through holes is formed and cream solder is printed on a substrate arranged under the mask.
It has a squeegee cover in which the squeegee is surrounded by a side surface side and a lower surface side with respect to the squeegee device .
A screen printing machine characterized in that an opening is provided in a side surface portion of the squeegee cover that surrounds the squeegee on the side surface side . The squeegee device includes a squeegee head that is connected to an elevating actuator to hold the squeegee in an ascending / descending manner, and the squeegee cover is removable from the squeegee head. The screen printing machine described in. The second aspect of the present invention, wherein the squeegee cover is attached by a hooking portion formed between the squeegee cover and the squeegee head and an attractive force of a magnetic force formed by a magnet portion. Screen printing machine. The screen printing machine according to claim 2, wherein a lateral actuator that can be expanded and contracted in a direction parallel to the mask is fixed to the squeegee head, and the squeegee cover is attached to the lateral actuator. .. The cream solder recovery device for collecting the cream solder on the mask is provided, and the cream solder recovery device is formed in such a shape that the recovery plate on which the cream solder on the mask is placed functions as the squeegee cover. The screen printing machine according to claim 1, wherein the screen printing machine is provided. In a screen printing machine in which cream solder is rolled by a squeegee device on the upper side of a mask in which a printing pattern consisting of a plurality of through holes is formed and cream solder is printed on a substrate arranged under the mask.
It has a squeegee cover that surrounds the squeegee with the side surface side and the lower surface side with respect to the squeegee device.
The squeegee device includes a squeegee head that is connected to an elevating actuator to hold the squeegee in an ascending / descending manner, and the squeegee cover is removable from the squeegee head.
The squeegee cover is attached by the hooking portion formed between the squeegee cover and the squeegee head and the attractive force of the magnetic force by the magnet portion.
An elevating member that can move in the elevating direction is fixed to the squeegee head, and the squeegee cover is hooked on the elevating member so that the hooking portion limits the descent of the elevating member. A screen printing machine that features that. The screen printing machine according to claim 6, wherein a lateral actuator that can be expanded and contracted in a direction parallel to the mask is fixed to the squeegee head, and the squeegee cover is attached to the lateral actuator. .. The cream solder recovery device for collecting the cream solder on the mask is provided, and the cream solder recovery device is formed in such a shape that the recovery plate on which the cream solder on the mask is placed functions as the squeegee cover. The screen printing machine according to claim 6, wherein the screen printing machine is provided.

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