JP2017154445A - Screen printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printer of which workability is enhanced.SOLUTION: A screen printer 1 which performs printing of a cream solder for a substrate by use of a mask in which a printing pattern comprising plural open holes is formed. A printer body cover 8, which covers the whole interior of the printer, comprises a top opening/closing cover 15 which is located on a top face of the printer, and a front opening/closing cover 16 which is located on a front face of the printer, and a printer interior front space 10, into which an operator can enter, is provided inside the front opening/closing cover 16.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a screen printing machine that makes it easy for an operator to perform work inside the machine body from the front side of the machine body.

  The screen printing machine is configured such that a screen mask having a printing pattern (printing through-hole) is held inside the machine body, and screen printing with cream solder is performed on the substrate conveyed by the substrate conveying device under the screen mask. ing. In addition to the substrate transfer device, the screen printing machine includes a substrate holding device for holding the transferred substrate and positioning it at a printing location, a screen mask holding device for positioning and holding the screen mask, and Is provided with a squeegee device for spreading cream solder on the screen mask from the upper surface.

  For example, in a substrate holding device of a screen printing machine, a conveyed substrate is lifted to a clamp position by a backup mechanism. The backup mechanism has a plurality of backup pins attached so as to avoid the position of electronic components mounted on the substrate. For this reason, when changing the production content, the operator must change the setup of the backup pin inside the machine body. In addition to this, cleaning of the substrate table soiled with cream solder is performed, and in any case, an operator standing in front of the machine body has to work on the back of the machine.

JP 2010-149299 A

  The screen printing machine described in Patent Document 1 is configured with an openable and closable shutter that moves up and down on the front side of the machine body in consideration of the difficulty of such work. This is to make it easier for the operator who is in a leaning posture to perform the work toward the back of the machine body. Furthermore, this screen printing machine has a central portion on the front side of the machine body that is recessed rearward and has a U-shape when viewed in plan view. The operator performs work into the machine at the standing position that enters the dent. However, the concave part of the front part of the fuselage does not substantially shorten the distance from the operator to the work position, so partial opening of the front part by the shutter is limited for improving workability. there were.

  Therefore, an object of the present invention is to provide a screen printing machine with improved workability in order to solve such a problem.

  The screen printing machine according to the present invention prints cream solder on a substrate using a mask on which a printing pattern composed of a plurality of through holes is formed. And a front opening / closing cover arranged on the front side of the machine body, and an in-machine front space where an operator can enter is provided inside the front opening / closing cover.

  According to the present invention, by opening not only the upper surface opening / closing cover but also the front surface opening / closing cover, the operator can work at a standing position that has stepped into the front space in the machine, and workability is improved.

It is a perspective view of the upper surface opening-and-closing cover which showed one Embodiment of the screen printing machine in an open state. It is a perspective view in the state where an upper surface open / close cover and a front open / close cover which showed one embodiment of a screen printer were opened. It is the side view which showed simply the internal structure of one Embodiment of a screen printer. It is the figure which showed the operation | movement of the safety arm simply. It is the perspective view which showed the relationship between the front opening / closing cover of a machine body cover, and the cleaning apparatus located in an evacuation place. It is the perspective view which showed the front opening / closing cover which mounts a solvent supply apparatus. It is a perspective view which shows the reference example of a screen printer.

  Next, an embodiment of a screen printer according to the present invention will be described below with reference to the drawings. 1 and 2 are perspective views showing the screen printing machine according to the present embodiment. FIG. 1 shows a state in which only the top cover is opened, and FIG. 2 shows that the top cover and the front cover are open. The state is shown. FIG. 3 is a side view schematically showing the internal structure of the screen printing machine. This screen printing machine 1 is for printing cream solder on a substrate, and constitutes a circuit board production line together with, for example, an inspection machine for inspecting the printing state and a component mounting machine for mounting electronic components on a substrate. It is.

  In the screen printing machine 1, a substrate is transported and held under a mask installed horizontally within the machine body, and cream solder is applied to the lower substrate from the upper surface of the mask through a printing pattern (through hole). As shown in FIG. 3, the screen printing machine 1 has a mask holder 2 on the upper side, which holds a mask fixed to a mask frame. A squeegee device 3 is installed on the upper side of the mask holder, and is attached so as to be movable in the left-right direction of FIG. On the other hand, a substrate table 5 is installed below the mask holder 2. The substrate table 5 includes a transfer device that loads and unloads the substrate in the body width direction, a clamp device that clamps the substrate in the longitudinal direction of the body, and a backup device that moves the substrate up and down to the clamp position.

  Further, the substrate table 5 is configured to be able to move up and down in a range indicated by an arrow A1 via a drive motor 11 and a ball screw mechanism. Further, between the mask holder 2 and the substrate table 5, a cleaning device 6 that wipes and cleans the mask dirt from the lower surface side and a camera unit 7 for imaging the marks attached to the substrate and the mask are provided. Yes. The cleaning device 6 and the camera unit 7 are integrally configured via a slider and can move along guide rails arranged in the longitudinal direction of the machine body. For example, the cleaning device 6 and the camera unit 7 are connected to a rotating belt stretched around a pair of pulleys, and can be moved in the longitudinal direction of the machine body in a range indicated by an arrow A2 by rotation control of the drive motor.

  Such a screen printing machine 1 is entirely covered with a machine body cover 8, and a conveyance port 801 for carrying in or carrying out a substrate is formed on both side surfaces in the width direction. Accordingly, the substrate carried by the transport device from the transport port 801 on the upstream side of the circuit board production line is lifted by the backup device and then held by the clamp device, and in that state, the substrate table is further moved to the printing position under the mask. Ascends every 5th. Then, the squeegee device 3 prints the cream solder on the substrate through the printing pattern of the mask. Thereafter, the substrate returned to the transfer position is unloaded from the transfer port 801 on the downstream side and sent to the next component mounter or the like.

  When the printing process on the substrate is repeated, the cleaning device 6 and the camera unit 7 move in the front-rear direction of the machine body shown by the arrow A2 in a state where the substrate table 5 is lowered as shown in FIG. At this time, a recognition mark or the like of the substrate is imaged by the camera unit 7, or the mask lower surface is wiped and cleaned by the cleaning device 6 at a predetermined timing. Since the cleaning device 6 and the camera unit 7 are located between the substrate table 5 and the mask holder 2, it is necessary not to interfere with the rising substrate table 5. Therefore, as shown in FIG. 3, the cleaning device 6 and the camera unit 7 are moved to a retreating place provided at the front of the machine body and can avoid interference with the rising substrate table 5.

  The screen printing machine 1 is formed with a framework 12 in which pillar members, beam members, and the like are assembled, and the devices are assembled thereto, and a machine body cover 8 is attached so as to cover the whole. In addition, an in-machine front space 10, which is an empty space indicated by a broken line in FIGS. 2 and 3, is provided in the in-machine front portion covered with the body cover 8 in order to secure the above-described retreat location. The body front portion of the skeleton 12 has a concave shape in a U-shape when viewed in plan so that both left and right sides protrude and an in-machine front space 10 is formed at the central portion therebetween. Even if the frame 12 has a concave structure, the machine body cover 8 has a flat surface in which the entire front surface of the screen printing machine 1 is substantially the same in order to secure a retreating place for the cleaning device 6 and the like. That is, unlike the screen printing machine described in Patent Document 1, the front surface of the body cover is not recessed.

  By the way, in the screen printing machine 1, the operator performs setup change of the backup device in the substrate table 5, maintenance in the machine, and the like. At this time, a part of the machine body cover 8 has a door-type opening / closing structure in this embodiment so that an operator's work from the front of the screen printing machine 1 can be easily performed. Specifically, not only the upper surface opening / closing cover 15 opened from the front surface of the aircraft to the upper surface but also a front opening / closing cover 16 configured to open the front surface of the aircraft. That is, as shown in FIG. 2, when the upper surface opening / closing cover 15 and the front surface opening / closing cover 16 are opened, the operator can work at a standing position that is stepped into the in-machine front space 10. .

  In this regard, the conventional screen printing machine has a fixed front surface, so that the operator stands in front of the machine with the front cover as shown in FIG. The table 5 and the like had to be folded greatly to be in a forward leaning posture or to extend the hand to work. Even in the case of the screen printing machine described in Patent Document 1, although the shutter is partially formed, the front surface of the machine body cover is fixed, and the distance from the operator's standing position to the substrate table is short. There wasn't. That is, even if the shape of the machine body cover is formed in a U-shape, the retracting place of the cleaning device is provided in the same manner as in this embodiment (see FIG. 1 of Patent Document 1), so the position outside the recessed machine body This is because the distance from the board to the board table is not short.

  Therefore, in the present embodiment, by providing a front door opening / closing cover 16 of a single door type with respect to the machine body cover 8, the internal front space 10 is made to function as a space that can be used when an operator works. . This in-machine front space 10 has a width of, for example, about 800 mm and is sufficient for an operator to enter. On the other hand, in a structure that allows an operator to enter the machine, care must be taken so that the work can be performed safely. Therefore, the screen printer 1 of the present embodiment is provided with a safety device. First, as shown in FIG. 2, a detection switch 25 for detecting the open state of the front opening / closing cover 16 is attached to the front opening, and the drive stop control of each device is performed by a detection signal transmitted by detecting the open state. To be done.

  The front opening / closing cover 16 has a safety arm 26 attached to the back side thereof. Here, FIG. 4 is a diagram simply showing the operation of the safety arm 26. In particular, the front portion of the screen printing machine 1 is shown in a plan view, and the in-machine front space 10 is indicated by a broken line. The front opening / closing cover 16 and the safety arm 26 are indicated by a solid line when the front opening / closing cover 16 is open, and are indicated by an alternate long and short dash line.

  In this safety arm 26, two belt-like plates 261 and 262 are connected to each other by a hinge, and the end of the belt-like plate 261 is attached to the back surface of the front opening / closing cover 16 via a hinge. The ends are attached to the in-flight framework 12 by hinges. Therefore, the safety arm 26 can be deformed by changing the angle of the belt-like plates 261 and 262 as the front opening / closing cover 16 is opened and closed.

  Specifically, when the front opening / closing cover 16 is opened, as shown in FIGS. 2 and 4, the angle between the belt-like plates 261 and 262 is large and close to a straight line so as to follow the front opening / closing cover 16. Will be placed. The safety arm 26 is arranged at a position that slightly crosses the in-machine front space 10. On the other hand, when the front opening / closing cover 16 is closed, as shown by a broken line in FIG. 4, the angle between the belt-like plates 261 and 262 is bent at an acute angle so that the front opening / closing cover 16 is separated. It will be arranged so as to protrude into the space 10.

  Therefore, when the front opening / closing cover 16 is opened, the safety arm 26 is arranged so as not to interfere with an operator standing in the front space 10 of the machine, while when the front opening / closing cover 16 is closed, The safety arm 26 hits an operator in the front space 10. That is, when the operator is working in the in-machine front space 10, the safety arm 26 is in the way and the front opening / closing cover 16 is not closed. This safety device is arranged so that the interference with the front space 10 in the machine is reduced when the front opening / closing cover 16 is open, and when it is closed, it protrudes to the position where it interferes and hits the operator. If it does, it is not restricted to the structure like the safety arm 26.

  5 and 6 are perspective views showing the front opening / closing cover 16 of the body cover 8 from the back side, and particularly FIG. 5 shows the relationship with the cleaning device 6 located at the retreat location. 6 shows a state in which a solvent supply device for supplying a solvent to the cleaning device 6 is mounted. The cleaning device 6 is configured to wipe the dirt on the mask from the lower surface side by the cleaning paper 21 by reciprocating in the front-rear direction of the screen printer 1 as indicated by the white arrow. Specifically, the cleaning paper 21 before use is unwound from the first roller 23, and the portion that has been used after being wiped off is wound up by the second roller 24. The first roller 23 and the second roller 24 are rotatably supported in parallel, and the cleaning paper 21 wound across the both is pressed against the lower surface of the mask.

  In the cleaning paper 21, a solvent is applied to the wiping portion that directly hits the mask by the solvent supply device 9. The solvent supply device 9 is assembled to the front opening / closing cover 16 as shown in FIG. 6, and the application of the solvent to the cleaning paper 21 is applied to the cleaning paper 21 as shown in FIG. It will be performed at a position close to. As shown in FIG. 2, the solvent supply device 9 has a solvent tank 31 containing a solvent placed in a case 32 located in the front space 10 in the apparatus. The case 32 fixed to the column member of the framework 12 is open on the front surface, and the front opening / closing cover 16 is formed with an opening 161 at a corresponding position. Therefore, even when the front opening / closing cover 16 is closed, the solvent tank 31 can be replaced.

  The solvent tank 31 located below is connected to the nozzle 33 located above by a flexible tube, and the solvent inside the solvent tank 31 is pumped up by a pump and discharged from the nozzle 33. The drive unit of the solvent supply device 9 provided with the nozzle 33 is assembled to a single support plate 35 and attached to the front opening / closing cover 16 via the support plate 35. A guide rail 36 is fixed horizontally to the support plate 35, and a slidable guide block 37 is fitted to the guide rail 36. A traveling table 34 having a nozzle 33 is fixed to the guide block 37.

  A servo motor 38 is fixed to the support plate 35, and a rotating belt 39 is stretched around a pulley fixed to the rotating shaft. The rotating belt 39 is also stretched over other pulleys 41 and 42 attached to the support plate 35, the tension roller 43, and the like. The traveling platform 34 is connected to the linear portion 391 of the rotating belt 39. Accordingly, the solvent supply device 9 can move as indicated by the arrow A3 along the edge above the front opening / closing cover 16 by the travel belt 34 being pulled by the rotation of the rotating belt 39 by the drive control of the servo motor 38. ing. A solenoid valve is connected to a tube connecting the solvent tank 31 and the nozzle 33, and the solvent discharged from the nozzle 33 is adjusted by opening / closing control thereof.

  As described above, in the screen printing machine 1 according to the present embodiment, not only the upper surface opening / closing cover 15 but also the front surface opening / closing cover 16 is configured as described above. The front opening / closing cover 16 can be opened and the work can be performed at a standing position that is stepped into the front space 10 in the machine. In that case, the cleaning device 6 and the camera unit 7 have moved to the rear of the machine body (the right side in FIG. 3). Therefore, the distance from the worker's standing position to the work location is shortened, and the workability is improved, for example, the hand can be easily seen and the work can be performed without the forward leaning posture with a large hip. Become.

  Further, the front opening / closing cover 16 is a single-open door type, and is not a completely detachable type that is screwed. Therefore, the front opening / closing cover 16 can be easily opened and closed. That is, it can be opened and closed without using a tool or the like, and the workability by the operator is not impaired. However, since it is easy to open and close, the screen printing machine 1 may be driven in the open state. In this embodiment, the drive stop control of each device is performed by the detection of the detection switch 25. Accordingly, not only forgetting to close the front opening / closing cover 16, but also the drive of the screen printing machine 1 stops even when it is opened unexpectedly. Even if the front opening / closing cover 16 is to be closed in a state where there is an operator in the front space 10 in the machine, the front opening / closing cover 16 is not closed by the safety arm 26.

  Furthermore, in this embodiment, since the front opening / closing cover 16 is a single door type, there is no problem in handling even if the solvent supply device 9 is attached to the back surface. In other words, it is difficult to attach the solvent supply device 9 in the shutter type as in the above-mentioned Patent Document 1, and the workability by the operator is impaired because the tube and cable need to be disconnected in the complete removal type that is screwed. On the other hand, in the present embodiment, the drive unit of the solvent supply device 9 assembled to the support plate 35 turns according to the opening and closing of the front opening / closing cover 16, but is connected to the tube connected to the nozzle 33 and the servo motor 38. There is no need to disconnect cables or the like, and no extra work is given to workers who perform setup changes. In addition, the solvent supply device 9 does not interfere with the operator who works in the front space 10 in the machine with the front opening / closing cover 16 opened.

  Next, another reference example of the screen printer will be described with reference to FIG. FIG. 7 is a perspective view showing a reference example of the screen printing machine. The screen printing machine 100 has the same internal structure as the screen printing machine 1 of the embodiment shown in FIG. 3 and is entirely covered with a machine body cover 108. The body cover 108 is formed with an upper surface opening / closing cover 115 that opens from the front surface of the body to the upper surface, and a front surface opening / closing cover 116 that also opens the front surface of the body. However, the front opening / closing cover 116 of this reference example is only a part of the front cover 112, and the opening is formed in the upper part so as to be continuous with the opening of the upper opening / closing cover 115.

  The upper surface opening / closing cover 115 and the front surface opening / closing cover 116 constitute an outer shell of the screen printing machine 100 as shown by a solid line in the closed state, and when opened, the upper surface opening / closing cover 115 rotates upward and rearward as shown by a broken line, The front opening / closing cover 116 is configured to rotate downward and forward. Further, since the front opening / closing cover 116 uses a free stop hinge or the like for the rotating shaft portion, the front opening / closing cover 116 can be maintained in an open state by stopping the rotation at an arbitrary angle without opening it vigorously. It is like that.

  Therefore, in the screen printing machine 100, the upper opening / closing cover 115 and the front opening / closing cover 116 are fully opened, so that an operator can easily lean forward by putting his body into the opening of the front opening / closing cover 116 at the time of setup change or maintenance. You can take a posture and work in the back of the aircraft. Further, by opening the front opening / closing cover 116, a margin is provided below the mask to be taken in and out, so that the replacement work is facilitated. Further, by allowing the cleaning paper of the cleaning device to be taken in and out through the opening where the front opening / closing cover 116 is opened, it is possible to proceed with work without stopping production. Moreover, since the area of the opening part by the front opening / closing cover 116 is small, the temperature change in a machine by opening / closing can be suppressed to the minimum. Further, since the front opening / closing cover 116 has a rotating shaft portion constituted by a free stop hinge, the front opening / closing cover 116 does not vigorously fully open due to its own weight when opened, and the operator's hand is caught or the device is damaged. Can be avoided. Further, since the front opening / closing cover 116 can be stopped at an arbitrary rotation angle, it can be used as a work table by positioning in a horizontal posture using a stopper mechanism.

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 embodiment, the safety arm 26 is adopted as one of the safety devices, but an optical sensor or the like for confirming the presence of the worker may be installed instead.
In addition, since the front space 10 of the cabin also becomes a storage space by closing the front opening / closing cover 16, a storage unit that can be easily taken out is configured so as not to interfere with safety devices such as the safety arm 26. Also good.

DESCRIPTION OF SYMBOLS 1 ... Screen printer 2 ... Mask holder 3 ... Squeegee device 5 ... Substrate table 6 ... Cleaning device 7 ... Camera unit 8 ... Machine body cover 9 ... Solvent supply device 10 ... In-machine front space 15 ... Top opening / closing cover 16 ... Front opening / closing Cover 26 ... Safety arm 31 ... Solvent tank 33 ... Nozzle

Claims (4)

In a screen printing machine for printing cream solder on a substrate using a mask on which a printing pattern consisting of a plurality of through holes is formed,
The aircraft cover that covers the entire interior of the aircraft is provided with an upper surface opening / closing cover arranged on the upper surface of the aircraft and a front opening / closing cover arranged on the front surface of the aircraft,
A screen printing machine characterized in that a front space inside the machine where an operator can enter is provided inside the front opening / closing cover. The upper surface opening and closing cover is an opening and closing door that opens so as to jump upward by a horizontal axis,
2. The screen printing according to claim 1, wherein the front opening / closing cover is a one-sided opening / closing door that opens to the front side by a vertical axis, and a predetermined work device is mounted on the rear surface thereof. Machine.   The screen printing machine according to claim 1, further comprising a door detection unit that detects an open state of the front opening / closing cover. It is a modified structure that is attached to the back surface of the front opening / closing cover and changes its form with opening / closing, and has safety means that exists so as to protrude into the front space in the machine when the front opening / closing cover is closed. The screen printing machine according to any one of claims 1 to 3, wherein:

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