JP2017164948A - Screen printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printer that prevents an operator from touching cream solder adhering to a squeegee.SOLUTION: A screen printer 1 rolls cream solder with a squeegee device 4 on an upper side of a mask 8 formed with a printing pattern constituted of a plurality of open holes and prints to a substrate 10 disposed on a lower side of the mask 8 with the cream solder. The screen printer includes a squeegee cover 28 surrounding the squeegee 32 from a lateral surface side and a lower surface side relative to the squeegee device 4.SELECTED DRAWING: Figure 1

Description

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

  In the screen printing machine, after the substrate carried by the transport device is held and placed at the printing position under the mask, the cream solder is printed on the substrate through the printing pattern (through hole) from the upper side of the mask by the squeegee. At that time, the cream solder will be pushed into the printed pattern while rolling on the mask with the squeegee, but the cream solder will remain attached to the squeegee after use, and the cream solder will droop in icicles, It will dripping. If it does so, cream solder will arrive at an operator in the case of setup change and maintenance in a machine. In order to prevent the cream solder from adhering to the operator, the cream solder adhering to the squeegee must be removed. However, the removal operation is very troublesome, and it is also necessary to remove the squeegee holder with the squeegee attached.

Japanese Patent Application Laid-Open No. 06-210827

  For example, Patent Document 1 below discloses a screen printing machine provided with a receiving plate that can be moved by a cylinder below a squeegee so as to receive the coating agent falling from the squeegee. However, since the receiving plate structure of Patent Document 1 uses a driving means such as a cylinder to insert and remove the receiving plate, the structure becomes complicated and the cost increases. Moreover, since the receiving plate receives the cream solder falling from the squeegee below, it is not configured to avoid contact between the squeegee to which the cream solder is attached and the operator. That is, it does not solve the problem with respect to the adhesion of cream solder to the operator who performs the work in the machine.

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

  In the screen printing machine according to the present invention, cream solder is rolled onto a substrate disposed on the lower side of the mask by rolling the cream solder on the upper side of the mask on which a printing pattern including a plurality of through holes is formed. And a squeegee cover in which the squeegee is surrounded by the side surface and the lower surface side of the squeegee device.

  According to the screen printing of the present invention, the cream solder is rolled by the squeegee on the upper side of the mask, the printing is performed on the substrate on the lower side of the mask, and the cream solder adheres to the squeegee by the repeated printing process. 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 adhered to the squeegee.

It is the figure which showed simply the internal structure of 1st Embodiment of the screen printer. It is the perspective view which showed the squeegee head equipped with the squeegee cover. It is a longitudinal direction side view of the squeegee head which equipped the squeegee cover. It is the perspective view which showed the squeegee cover. It is the side view which showed the modification of the squeegee apparatus simply. It is the side view which showed the other modification of the squeegee apparatus simply. It is the figure which showed simply the internal structure of 2nd Embodiment of the screen printer. It is the figure which showed simply the internal structure of 2nd Embodiment of the screen printer.

  Next, an embodiment of a screen printer 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 according to the present embodiment. The screen printing machine 1 is configured as a pre-process of a component execution machine that mounts electronic components on a substrate 10. The screen printing machine 1 is provided with a substrate transport device 3, a squeegee device 4, a clamp device 5 for gripping the substrate, a lifting device (not shown) for positioning the substrate in the vertical direction, and the like. And the control apparatus which controls the whole screen printing machine is mounted, and the predetermined control with respect to the drive part of each apparatus is performed.

  In the screen printing machine 1, the substrate 10 is carried in and out by the substrate conveying device 3, and the substrate conveying device 3 is constituted by a pair of conveyor belts 11 that support both sides of the substrate 10. The substrate 10 is fed in a direction penetrating through (machine body width direction). The substrate transfer device 3 is provided in the clamp device 5 that holds the substrate 10 and can be moved up and down by a lifting device (not shown). The clamp device 5 is arranged with a pair of side frames 13 and 14 on the front and rear of the table 12, and one side frame 14 is configured with a ball screw mechanism in which a screw shaft is screwed to an internal fixing nut, which is not shown. The distance from the side frame 13 can be adjusted by the rotation of the clamping motor.

  A clamp portion 15 is formed at the upper end portions of the side frames 13 and 14 so that the substrate 10 can be held by the distance between them. The conveyor belt 11 is assembled to the side frames 13 and 14 below the clamp portion 15, and the substrate transfer device 3 is configured to transfer the substrate 10 between the side frames 13 and 14. 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 substrate 10, the backup table 17 is supported by a guide rod 19, and can be moved up and down by a backup lifting device. It has become. The entire clamping device 5 including the backup mechanism is also configured to be lifted and lowered by a lifting device (not shown).

  Above the clamp device 5, a mask 8 on which a printing pattern composed of a plurality of minute through holes is formed is installed. The mask 8 is attached in a stretched state to the rectangular frame 801, and is installed in the machine via a mask holder. A squeegee device 4 for spreading cream solder is provided above the mask 8. In the squeegee device 4, a pair of squeegee heads 21, 22 each having a squeegee 32 is fixed to the lower end of a piston rod of a cylinder 23 provided for each squeegee head 32, and is suspended in a liftable state.

  The two cylinders 23 are mounted on one traveling table 25. The traveling table 25 is slidably assembled with a guide rod 26 installed in the horizontal direction (the longitudinal direction of the machine body) 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 installed in the screen printing machine 1 in a rotatable state, and is rotated by a drive motor. The traveling table 25 has a ball screw mechanism constituted by an internal fixing nut and a screw shaft, and can be moved along the guide rod 26 under the control of a drive motor.

  In the screen printing machine 1 configured as described above, when the substrate 10 is loaded 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. When the side frame 14 moves, the substrate 10 is sandwiched and held by the clamp portions 15 of the pair of side frames 13 and 14, and the entire clamp device 5 in a state of holding the substrate 10 is raised, so that the mask 8 is ready for printing on the substrate 10 located immediately below the substrate 8.

  Thereafter, on the upper side of the mask 8, the supplied cream solder is pushed onto the print pattern while rolling on the mask 8 by the squeegee device 4. In the screen printing machine 1, one of the corresponding squeegee heads 21, 22 is lowered by driving the cylinder 23 according to the moving direction of the traveling table 25 that reciprocates, and the cream solder is spread by the squeegee 32. Thereby, cream solder is printed on the substrate 10 located under the mask 8 through the printing pattern.

  Thus, the cream solder printed on the substrate 10 has viscosity. Therefore, cream solder adheres to the squeegee 32 due to repeated printing processes, and the cream solder drips when the squeegee 32 rises. The operator needs to change the backup pin 18 in accordance with the change in the production contents, and in such a case, the operator puts his hand in the machine and performs the work. However, as described in the above problem, the operator touches the cream solder dripping from the squeegee 32 as it is, and the dripped cream solder arrives at the operator even if care is taken. Therefore, the screen printing machine 1 according to the present embodiment is provided with a detachable squeegee cover 28 so that the operator can work without touching the cream solder attached to the squeegee 32.

  In FIG. 1, the left side of the drawing is the front side of the screen printer 1. The worker will stand on the front side of the machine body, open the open / close cover and insert the body. Accordingly, 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 operator's standing position. Here, FIG. 2 is a perspective view showing the squeegee heads 21 and 22, and the attached squeegee cover 28 is indicated by a one-dot chain line. 3 is a longitudinal side view 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 specifically showing an 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 longitudinal direction of the machine body, which is the moving direction of the traveling platform 25. The squeegee heads 21 and 22 are attached to a rod-like base 31 having a long dimension in the body width direction so that a squeegee 32 that is a belt-like plate material projects downward. At this time, the squeegees 32 are fixed in a posture inclined forward in the facing direction, that is, in each traveling direction. The squeegee heads 21 and 22 have an L-shaped hook 33 fixed to the upper surface of the base 31 and are connected to the connecting member 24 (see FIG. 1) fixed to the lower end of the piston rod 23 of the cylinder via the hook 33. Can be removed. A rail 35 is fixed to the base 31 in the longitudinal direction, and a paste doctor 36 for preventing 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 swing members 38 formed integrally with the squeegee 32 are fitted therein. The swinging member 38 allows adjustment of the inclination angle of the squeegee 32 swinging around its lower end by sliding the arc portion with respect to the guide block 37. The guide block 37 is provided with a fastening member 39 with a screw for restraining the swinging 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 the upper side to the side and downward. As shown in FIG. 4, the squeegee cover 28 formed of a thin plate is formed with two attachment portions 41 in the width direction in accordance with the guide blocks 37 at two locations of the squeegee head 21, and further inclined side portions 42 and A lower receiving portion 43 is formed.

  The attachment portion 41 has a hook portion 45 cut out in a U shape 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 hooking groove 395 is formed in the neck portion 392. Therefore, the hook portion 45 of the squeegee cover 28 is fitted into the hook groove 395, and at this time, the magnet 46 is attracted to the metal guide block 37. The squeegee cover 28 is configured to be attached to the squeegee head 21 by the hook portion 45 and the attracting force of the magnet 46 so as to maintain the attached state shown in FIGS.

  The squeegee cover 28 is largely cut off between the two attachment portions 41 in the width direction over the side surface portion 42, and an opening 47 is formed so that the operator can see the squeegee head 21 when attaching. . And the receiving part 43 is formed in the tip of the inclined side part 42 so that it may be arrange | positioned in a horizontal state directly under the squeegee 32, when it attaches. The receiving portion 43 is formed with a tapered portion 48 which is inclined at the tip portion so as to easily scoop out the cream solder like dust removal. Further, on both edges in the width direction of the squeegee cover 28, wall portions 49 are formed to ensure the rigidity of the cover shape formed of a thin plate and prevent the cream solder from spilling sideways.

  The 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. The attached squeegee cover 28 surrounds the squeegee heads 21 and 22 from the operator side, so that even if cream solder adheres to the squeegee 32, an operator who puts his hand in the machine and touches the cream solder touches it. Can not be. Moreover, it is possible to receive the dripped cream solder so as not to reach the operator. Therefore, the working environment in the machine is improved, and the worker can proceed with the work without being bothered by the cream solder dripping or dripping. In the past, the work of removing the cream solder from the squeegee 32 has been performed before the setup change, but the downtime of the screen printing machine 1 can be shortened by omitting the removal work.

  The squeegee cover 28 can be mounted by simply fitting the hook portion 45 of the squeegee cover 28 into the hook groove 395 of the squeegee head 21 and attracting the magnet 46 to the guide block 37. The same can be done for removal. In addition, since the hooking portion 45 only needs to be aligned with the hooking groove 395 at the time of attachment, it is easy to see for the operator and positioning is very simple. And since the large opening part 47 is formed in the squeegee cover 28, it can also be attached so that the dripping cream solder may be scooped out, confirming the front-end | tip part (taper part 48) of the squeegee 32. FIG. The screen printer 1 is preferably 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 when the squeegee head 21 is mounted, and forgetting to remove the squeegee cover 28 can be prevented.

  By the way, the squeegee cover 28 functions to prevent contact with the cream solder by the operator as described above, but can also be applied to use as a transport cover. FIG. 5 is a side view schematically showing a modification of the squeegee device showing the use of such a squeegee cover. In this squeegee device 50, two cylinders 52 are mounted on a traveling platform 51 that can move in the longitudinal direction of the machine body, and a pair of squeegee heads 55 and 56 each having a squeegee 53 are provided in each cylinder. A piston rod extending downward from 52 is fixed.

  In the squeegee device 50, an elevating plate 57 is fixed horizontally so as to protrude in the longitudinal direction of the machine body (left and right direction in the drawing) with respect to the squeegee heads 55 and 56, and further in the vertical direction as the elevating direction. The standing side shaft 58 is fixed. On the other hand, a support block 59 is fixed horizontally so as to protrude in the longitudinal direction of the vehicle body 51, and a side shaft 58 passes through a bush 61 fitted therein. The two side shafts 58 are formed with two annular hook grooves 63 and 64 into which the hooks of the squeegee cover 280 (see “Hook 45” 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. Changes have been made to lengthen the dimensions of the notched U-shaped hooks.

  Therefore, in the squeegee device 50, the corresponding squeegee head 55 or 56 is lowered according to the traveling direction of the traveling platform 51, and the cream solder is spread by the squeegee 53. When the squeegee heads 55 and 56 are moved up and down, the respective lift plates 57 and the side shafts 58 are moved up and down integrally. In such a printing process, the squeegee cover 28 is removed from the squeegee device 50, but is attached when work in the machine such as setup change or maintenance is performed. As shown in the figure, the squeegee heads 55 and 56 are in the ascending position, and the squeegee cover 28 is fitted into the two engaging grooves 63 located on the lower side as indicated by the one-dot chain line. Then, the magnet 46 is attracted to a 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 hook portion of the mounting portion 410 is fitted into the two hook grooves 64 positioned on the upper side, and the magnet 46 is attracted to the metal support block 59. In such a second attachment state, the lowering of the side shaft 58 is restricted, so that the squeegee heads 55 and 56 are also lowered, and the movement of the squeegee device 50 is stopped. Therefore, in this embodiment, the squeegee cover 280 can be mounted in two patterns. When the squeegee cover 280 is hooked on the lower hooking groove 63, the operator does not touch the cream solder adhering to the squeegee 53 in the machine. Work can proceed. Further, when hooked on the upper hooking 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 be used as a cream solder collecting plate. FIG. 6 is a side view schematically showing another modification of the squeegee device showing the use of such a squeegee cover, and the solder recovery process is shown step by step in (A) to (E). In the squeegee device 70, two cylinders 52 are mounted on a traveling platform 51 that can move in the longitudinal direction of the machine body, and a pair of squeegee heads 55, 56 each having a squeegee 53 is provided in each cylinder 52, as in the above embodiment. It is being fixed to the piston rod extended below. The cover cylinder 71 is fixed in a horizontal posture to the squeegee head 55 located on the front side of the machine body, the piston rod protrudes toward the front of the machine body (left side in the drawing), and the squeegee cover 28 is detachable at the tip part. It is attached with.

  In the normal squeegee device 70, the squeegee cover 28 is removed, and a printing process is performed in which cream solder is spread on the mask 8 by the squeegee 53 as described above. On the other hand, the squeegee cover 28 is attached to the cover cylinder 71 when changing the setup or performing maintenance on the screen printing machine. Therefore, as shown in FIG. 6A, the squeegee heads 55 and 56 are surrounded by the squeegee cover 28, so that the operator can easily perform the work in the machine.

  Furthermore, in this embodiment, when the cream solder remains on the mask 8 to be replaced, the cream solder 100 can be collected by the squeegee device 70. First, as shown in FIG. 6B, the squeegee head 55 and the squeegee cover 28 are integrally lowered while the cover cylinder 71 is extended. The squeegee cover 28 is formed with an elongated hole in the vertical direction, and a piston rod of the cover cylinder 71 is connected thereto. Accordingly, 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 play range of a long hole (not shown). The squeegee cover 28 can be brought into close contact without being bent.

  Next, as shown in FIG. 6C, the squeegee device 70 is lowered to a position where the squeegee cover 28 contacts 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. Thereafter, 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. As shown in FIG. 6E, the cream solder 100 remaining on the mask 8 can be recovered by contracting both cylinders 52 and raising the squeegee heads 55 and 56 and the squeegee cover 28.

  Next, a second embodiment of the screen printer will be described. FIG. 7 is a diagram simply showing the internal structure of the screen printing machine according to the second embodiment. The screen printing machine 80 has a configuration in which substrate devices 82 and 83 are provided at two locations below the mask 81, and the 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. On the other hand, a squeegee device 84 is provided above the mask 81 as in the above-described embodiment, and the pair of squeegees 841 and 842 are configured to be movable up and down. And the 1st solder collection | recovery apparatus 85 and the 2nd solder collection | recovery apparatus 86 are provided so that the squeegee apparatus 84 may be pinched | interposed from the body front-back direction (drawing horizontal direction).

  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 moves simultaneously in the longitudinal direction of the machine body by the rotation of the drive motor 88. ing. In addition, the squeegee device 84 and the first solder recovery device 85 are each provided with motors 843 and 853 for movement, and can be moved independently by rotating the internal nuts via the rotation transmission mechanisms 845 and 855. It has become. Further, the first solder recovery device 85 and the second solder recovery device 86 are attached so that the recovery plates 91 and 92 can be moved up and down by built-in cylinders.

  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 and 842 (specifically, the squeegee head) are formed so as 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. It is supposed to fulfill its function.

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

  In addition to such a solder recovery function, the recovery plate 91 covers the squeegees 841 and 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 do. Therefore, similarly to the first embodiment, the work in the machine can be performed without the operator touching the cream solder attached to the squeegees 841 and 842 by the collection plate 91 serving as the squeegee cover.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.
For example, in the above embodiment, the U-shaped hooking portion 45 is fitted into the annular hooking groove 395 as the hooking 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.
Further, the shape of the squeegee cover is not limited to that shown in FIG.

DESCRIPTION OF SYMBOLS 1 ... Screen printer 4 ... Squeegee apparatus 5 ... Clamp apparatus 8 ... Mask 10 ... Board | substrate 21, 22 ... Squeegee head 23 ... Cylinder 25 ... Running stand 28 ... Squeegee cover 37 ... Guide block 39 ... Fastening member 41 ... Mounting part 42 ... Side surface portion 43 ... Receiving portion 45 ... Hook portion 46 ... Magnet 47 ... Opening portion 48 ... Tapered portion 395 ... Hook groove

Claims (6)

In a screen printing machine that performs cream solder printing on a substrate disposed on the lower side of the mask by rolling the cream solder on the upper side of the mask on which a printing pattern composed of a plurality of through holes is formed,
A screen printing machine comprising a squeegee cover in which a squeegee is surrounded by a side surface and a lower surface side of the squeegee device.   The squeegee device includes a squeegee head that is connected to an elevating actuator to hold the squeegee so that the squeegee can be raised and lowered, and the squeegee cover is detachable from the squeegee head. The screen printing machine described in 1.   The said squeegee cover is attached by the hook by the hook part formed between the said squeegee heads, and the adsorption force of the magnetic force by a magnet part, The Claim 2 characterized by the above-mentioned. Screen printing machine.   The squeegee head is fixed with an elevating member movable in the elevating direction, and the squeegee cover is hooked on the elevating member so that the hooking part restricts the lowering of the elevating member. The screen printer according to claim 3.   The screen printing machine according to claim 2, wherein a sideways actuator that can extend and contract in a direction parallel to the mask is fixed to the squeegee head, and the squeegee cover is attached to the sideways actuator. . A cream solder collecting device for collecting the cream solder on the mask, wherein the cream solder collecting device is formed such that a collecting 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.

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