JP2007190731A - Screen printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To arrange compactly members constituting a cleaning apparatus while interference with other members is avoided, and to facilitate maintenance and inspection in a screen printing machine. <P>SOLUTION: The cleaning apparatus 8 assembled in the screen printing machine is equipped with a cleaning unit 80 arranged below a mask sheet installing position and movable in the definite direction, a filter 86 arranged outside of a range which a printing stage 10 on a base 2 occupies and connected with the cleaning unit through a first air suction pipe 85a, and a suction apparatus 87 arranged below the upper face of the base 2 and connected with the filter 86 through a second air suction pipe 85b. In addition, an openable/closeable cover 110 is provided at least at a position positioning outside of the filter 86 in a housing 1 for the printing machine. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen printing machine that applies a solder paste to a printed circuit board through a mask sheet and includes a cleaning device that removes the solder paste attached to the mask sheet.

  2. Description of the Related Art Conventionally, various types of screen printers that apply solder paste to a printed circuit board through a mask sheet are equipped with a cleaning device that removes solder paste adhered to the mask sheet after printing.

  For example, in the screen printing machine shown in Patent Document 1, a cleaning unit that can move along the lower surface of the mask sheet is disposed below the location where the mask sheet is placed, and this cleaning unit is equipped with a wiping tape. In addition, a large number of holes are provided in a portion that supports the tape, and a communicating portion that communicates with the holes is connected to the suction unit. And the solder paste adhering to a mask sheet | seat is removed by the wiping off with the said tape and the attraction | suction force which acts from the said hole part with the action | operation of a suction unit.

Further, in the screen printing machine disclosed in Patent Document 2, a cleaning unit movable along the lower surface of the mask sheet is arranged below the mask sheet installation location, and a spatula and ink for scraping are disposed in the cleaning unit. A residue intake port is provided, and a portion communicating with the ink residue intake port is connected to the air intake means via a filter. Along with the operation of the suction means, a suction force acts on the ink residue intake port so that the ink residue attached to the mask sheet is removed.
JP 9-193362 A Japanese Patent No. 2599824

  By the way, when the screen printer is equipped with a cleaning device as described above, it is necessary to incorporate a cleaning unit (cleaning unit), a suction unit (intake means), a filter, and the like into the screen printer, and depending on how these are arranged. May interfere with other members or may require extra installation space.

  The filter requires maintenance and inspection such as cleaning and replacement when the element is clogged. However, depending on the arrangement, the maintenance and inspection becomes difficult.

  These points have not been sufficiently considered in the past, and there is room for improvement.

  The present invention has been made in view of the above circumstances, and the members constituting the cleaning device are arranged compactly without interfering with other members and taking up as little installation space as possible. The purpose is to provide a screen printer that can be easily inspected and maintained.

  In order to solve the above problems, the present invention is provided with a printing stage that supports a substrate for printing on a base in a printing machine housing, and a mask sheet holding unit that holds a mask sheet above the printing stage, A screen printing machine provided with a squeegee unit for applying solder paste to the substrate through the mask sheet, and also provided with a cleaning device for removing the solder paste adhered to the mask sheet, wherein the cleaning device comprises the mask A cleaning unit disposed below the sheet installation location and movable in a certain direction, and disposed outside the range occupied by the printing stage on the base, and a first intake pipe in the cleaning unit Connected to the filter through the second intake pipe to this filter It is equipped with a suction device, the said press housing, at a position located outside of at least the filter, in which an openable cover is provided.

  According to this screen printing machine, the filter is disposed in an empty space that exists outside the area occupied by the printing stage on the base, so that interference with the printing stage and the like can be avoided, and an extra installation place in the housing. It is arranged compactly without taking.

  Further, since the filter is located on the base and a cover that can be opened and closed is provided on the outside thereof, maintenance inspection such as cleaning and replacement of the filter element can be easily performed.

  In this screen printing machine, it is preferable that the filter is disposed above the upper surface of the base, while the suction device is disposed below the upper surface of the base.

  In this way, maintenance and inspection such as cleaning and replacement of the filter element can be easily performed on the base, while a suction device that is less frequently required for inspection than the filter is disposed below the upper surface of the base. Therefore, the filter and the suction device are rationally arranged while the space on the base is effectively used and the interference with the printing stage or the like is avoided.

  When arranging in this way, it is preferable that a recess is formed at the end of the base on the side where the cover is provided, and a suction device is installed in the recess.

  In this way, maintenance inspection of the suction device is also possible. Furthermore, by installing the suction device in the concave portion, it is possible to suppress the thermal influence due to the heat generated from the suction device from reaching the printing stage.

  The upstream portion of the first intake pipe is supported by a deformable intake pipe support member. The intake pipe support member is bent at an intermediate portion, and one end is connected to the cleaning unit and the other end is fixed. It is connected to the frame, and the downstream side portion of the first intake pipe is preferably fixedly arranged from the fixed frame to the filter.

  In this case, the first intake pipe is laid out in the printer housing in a state where the first intake pipe is supported so as to be deformable as the cleaning unit moves.

  Further, it is preferable that an exhaust pipe is connected to the suction device, and a discharge side end portion of the exhaust pipe is led out to the outside through a side wall of the printer main body housing.

  If it does in this way, it will not be exhausted in a printer housing, and exhaust from an exhaust pipe will not have a bad influence on printing operation etc.

  If a muffler is provided at the discharge side end of the exhaust pipe, quietness is enhanced.

  According to the screen printing machine of the present invention, members such as a filter and a suction device constituting the cleaning device can be compactly arranged in the printer housing while avoiding interference with other members, and the filter or the like. Maintenance inspection can be easily performed.

  Embodiments of the present invention will be described with reference to the drawings.

  1 and 2 schematically show a screen printing machine according to the present invention, FIG. 1 is a side view, and FIG. 2 is a front view showing the screen printing machine.

  As shown in these drawings, a printing stage 10 is provided on a base 2 in a printing machine housing 1, and a printed board W is carried into and out of the printing stage 10 on both sides of the printing stage 10. Therefore, an upstream conveyor 11 and a downstream conveyor 12 are arranged along the X-axis direction (conveyance line).

  Further, the printing machine includes a clamp unit 3 for clamping the printed circuit board W, a positioning unit 4 for engaging and positioning the upper surface of the substrate W when clamping the substrate W, and an upper part of the printing stage 10. A mask sheet holding unit 5 and a squeegee unit 6, a camera unit 7 for photographing the substrate W and the mask sheet 51 (see FIGS. 3 and 4), and a solder paste attached to the mask sheet 51. The substrate W clamped by the clamp unit 3 is placed on the mask sheet 51 of the mask sheet holding unit 5 and screen printing is performed by the squeegee 61 of the squeegee unit 6 in this state. It has come to be.

  The printing stage 10 includes a Y-axis table 21, an X-axis table 22, an R-axis table 23, and an elevating table 24, and the substrate W is placed horizontally and the X-axis, Y-axis, Z-axis, and R-axis (around the Z-axis) It is designed to be displaceable in the direction of rotation.

  That is, a rail 211 is arranged on the base 2 along a Y-axis direction orthogonal to the X-axis in a horizontal plane, and a Y-axis table 21 is slidably attached to the rail 211 in the Y-axis direction. The Y-axis table 21 is driven via a ball screw mechanism by an external Y-axis servo motor. An X-axis table 22 is slidably mounted on the Y-axis table 21 in the X-axis direction, and the X-axis table 22 is driven via a ball screw mechanism by an X-axis servo motor (not shown). Yes. An R-axis table 23 is mounted on the X table 22 so as to be rotatable about a vertical line (Z-axis direction). The R-axis table 23 is driven to rotate by a R-axis servo motor (not shown) via a ball screw mechanism. It has come to be. Further, an elevating table 24 is mounted on the R-axis table 23 so as to be movable up and down, and the elevating table 24 is driven up and down via a ball screw mechanism by a Z-axis servo motor (not shown).

  A pair of main conveyors 20 is provided on the lifting table 24 along the X-axis direction. The main conveyor 20 is arranged with the upstream end and the downstream end facing the end of the upstream conveyor 11 and the end of the downstream conveyor 12 in a state where the elevating table 24 is lowered, In this state, the substrate W can be transferred between the main conveyor 20 and the conveyors 11 and 12 on both sides.

  A mounting table 29 is provided between the pair of main conveyors 20 on the lifting table 24 so as to be vertically movable via a slide column 291. A ball screw mechanism (not shown) is provided between the mounting table 29 and the lifting table 24, and the mounting table 29 moves up and down with respect to the table 24 by driving the ball screw mechanism. It is configured as follows. The placement table 29 is for allowing the substrate W to be placed. When the placement table 29 is raised, the substrate W on the main conveyor 20 is transferred onto the placement table 29 and moved upward, while it is lowered. Thus, the substrate W on the placement table 29 is configured to be transferred to the main conveyor 20 side.

  The clamp unit 3 provided on the lift table 24 includes a pair of strip-shaped clamp pieces 31a and 31b arranged along the X-axis direction above the pair of main conveyors 20, and one of the clamp pieces 31a is The other side clamp piece 31b is fixed to the lifting table 24, and the other side clamp piece 31b is slidable in the Y-axis direction so as to be able to contact and separate from the one side clamp piece 31a. When the placement table 29 on which the substrate W is placed rises, the other side clamp piece 31b is driven by a driving means (not shown) and moves in a direction approaching the one side clamp piece 31a. The substrates 31a and 31b are clamped by sandwiching the substrate W from both sides.

  Further, the positioning unit 4 includes a pair of belt-like positioning plates 41a and 41b arranged corresponding to the clamp pieces 31a and 31b, respectively. Then, the positioning plates 41a and 41b are disposed on the clamp pieces 31a and 31b with the retracted positions arranged outside the clamp pieces 31a and 31b while maintaining the horizontal posture by the drive mechanism including the parallel link mechanism and the like. Thus, the positioning plate 41a, 41b is set to the positioning position when the mounting table 29 on which the substrate W is placed is lifted so that it can be displaced to the positioning position protruding inward from the clamp pieces 31a, 31b. The substrate W is positioned in contact with the substrate W.

  FIG. 3 is a perspective view showing the positional relationship of each part of the printing press.

  As shown in the figure, the mask sheet holding unit 5 has a mask sheet support base 52 fixedly provided on both the left and right sides above the printing stage 10, and a paste application portion is provided on the mask sheet support base 52. The mask sheet 51 having an opening is placed in a state where the mask sheet 51 projects in a horizontal arrangement. Two mask sheet clamps 53 are provided on the left and right mask sheet support bases 52 on the front and rear sides, respectively, and the mask sheet clamps 53 are driven by a driving means (not shown) such as an air cylinder. Is fixed on the mask sheet support base 52.

  The squeegee unit 6 provided on the upper side of the mask sheet holding unit 5 is supported by a squeegee support frame 63 erected on both the left and right sides of the printing stage 10. Guide rails 64 extending in the Y-axis direction are provided on the upper surfaces of the left and right squeegee support frames 63, and a movable beam 65 movable along the guide rails 64 is provided so as to straddle the upper side of the printing stage 10. A pair of squeegees 61 are attached to the beam 5 so as to be movable up and down.

  FIG. 4 is a perspective view showing a portion in which the camera unit and the cleaning unit of the cleaning device are incorporated in the screen printing machine of the present embodiment.

  As shown in FIGS. 3 and 4, on the left and right sides of the printing stage 10, lower guide rails 74 extending in the Y-axis direction are provided on the lower surface side of the squeegee support frame 63. A moving beam 75 is supported so as to be stretched. The moving beam 75 is movable in the Y-axis direction along the lower guide rail 74, and the height position thereof is set between the printing stage 10 in the lowered state and the mask sheet 51.

  A ball screw 76 is provided outside the squeegee support frame 3 along the Y-axis direction, and a nut (not shown) provided on the moving beam 75 is screwed to the ball screw 76. The moving beam 75 is moved in the Y-axis direction by being driven to rotate.

  A camera unit 7 for photographing the substrate W and the mask sheet 51 and a cleaning unit 80 of the cleaning device 8 are attached to the moving beam 75. Thus, in this embodiment, the moving beam 75 is shared as a moving mechanism for the camera unit 7 and the cleaning unit 80. Further, the lower guide rail 74 that supports the moving beam 75 is provided from the printing work area below the mask sheet 51 to the rear thereof. When the printing work is executed, the camera unit 7 and the cleaning unit 80 are printed. By retracting to a standby position behind the work area, interference with the printing stage 10 is prevented.

  The camera unit 7 is attached in front of the moving beam 75. The camera unit 7 includes a camera head 71 including an upward-facing mask sheet photographing camera 711 and a downward-facing substrate photographing camera 712, and includes an X-axis direction guide and a ball screw mechanism provided on the front surface of the moving beam 75. The camera movement mechanism 77 can be driven to travel in the X-axis direction. As a result, the camera head 71 moves on the XY plane and performs shooting by using the camera moving mechanism 77 in the X-axis direction and the moving mechanism of the camera unit 7 and the cleaning unit 80 in the Y-axis direction. Can be done.

  The cleaning unit 80 is attached to the rear of the moving beam 75 and is movable in the Y-axis direction in the space between the mask sheet 51 and the printing stage 10 formed when the table 24 is lowered. The cleaning unit 81 is provided with a cleaning head 81 that can be moved up and down, and the cleaning head 81 is slidably brought into contact with the lower surface of the mask sheet 51 at the raised position to perform cleaning.

  FIG. 5 is a perspective view schematically showing the cleaning head 81 as seen from the back side of the printing press. As shown in this figure, the cleaning head is equipped with a belt-like wiping tape 82, and the wiping tape 82 is sequentially supplied from a roll. A suction opening 83 having a width corresponding to the size of the mask sheet 51 in the X-axis direction is disposed below the wiping tape 82, and a connection port 84 communicating with the suction opening 83 is connected to an intake pipe 85a described later. It has become.

  In order to apply a suction force to the suction opening 83, a first intake pipe 85a, a filter 86, a second intake pipe 85b, a suction device 87, and the like are provided in the printing press housing 1 as shown in FIGS. The cleaning device 8 is configured by these. 6 to 8 show a part constituting the cleaning device 8 in the screen printing machine of this embodiment by a solid line, and the other parts are schematically shown by a two-dot chain line. FIG. 6 is a rear view. 7 is a plan view, and FIG. 8 is a side view. The configuration of the cleaning device 8 shown in FIGS. 6 to 8 will be specifically described.

  The cleaning device 8 is provided with a filter 86 in the middle of a path for introducing air from the cleaning unit 80 to the suction device 87. It is placed outside the occupied area. That is, on the base 2, the printing stage 10 occupies a certain range including the movement range in the X-axis direction and the Y-axis direction. Since a certain amount of empty space exists on the front side and the rear side, the filter 86 is arranged using the empty space. In the illustrated embodiment, the filter 86 is arranged on the rear side (back side) on the base 2. ing.

  The inlet 861 of the filter 86 is connected to the connection port of the cleaning unit 80 via the first intake pipe 85a. The upstream side portion of the first intake pipe 85a is formed of a flexible hose and is supported by a deformable bare cable 850 (intake pipe support member). The bare cable 850 has an intermediate portion bent in a U shape, one end is connected to the cleaning unit 80, and the other end is connected to a fixed frame 101 provided on one side portion above the printing machine housing 1. As the cleaning unit 80 moves in the Y-axis direction, the bare cable 850 is deformed so as to follow it. The upstream side of the first intake pipe 85a passes from the connection port of the cleaning unit 80 through the bare cable 850 and reaches the fixed frame 101, and the downstream side of the first intake pipe 85a extends downward from the fixed frame 101 through one rear side of the housing 1. And bends laterally on the base 2 to reach the inlet 861 of the filter 86.

  As shown in FIG. 9, the filter 86 includes a container 860 having an air inlet 861 and an outlet 862, a filtering element 863 accommodated in the container 860, and an upper opening of the container 860. A lid 864 that can be opened and closed is configured such that air that has flowed into the container 860 from the inlet 861 passes through the element 863 and then flows out from the outlet 862.

  Returning to FIGS. 6 to 8, a suction device 87 is connected to the outlet 862 of the filter 86 via a second intake pipe 85 b. The suction device 87 is composed of an electric fan or the like, and is disposed below the upper surface of the base 2 so as not to interfere with the printing stage 10. Specifically, a recessed portion 201 that is recessed downward is provided on the side portion on the rear side of the base 2, and the suction device 87 is installed in the recessed portion 201. A second intake pipe 85 b is connected to the suction port of the suction device 87, and an exhaust pipe 88 is connected to the discharge port of the suction device 87.

  The exhaust pipe 88 passes through the side wall of the printing press housing 1 and is led out to the outside. A muffler 89 is attached to the end of the exhaust pipe 88.

  Further, the printing machine housing 1 is provided with a cover 110 that can be opened and closed at least at a position located outside the filter 86. In the present embodiment, a back surface portion that is outside the filter 86, and a front surface portion, A cover 110 that can be opened and closed is provided.

  Next, the operation of the printing machine of this embodiment will be described.

  At the time of printing, the substrate W to be printed is first carried from the upstream conveyor 11 onto the main conveyor 20 of the printing stage 10, and then the placement table 29 is lifted and the substrate W is pushed up to a predetermined height before the clamp unit. 3, the elevating table 24 is further raised, and the substrate W is placed on the lower surface of the mask sheet 51 held by the mask sheet holding unit 5. After the substrate W is set in this way, the squeegee unit 6 is operated, and the solder paste is applied to the substrate W through the mask sheet 51 by the squeegee 61, and printing is performed.

  After completion of printing, clamping by the clamp unit 3 is released, the mounting tail 29 and the lifting table 24 are lowered, and the printed substrate W is transferred to the main conveyor 20 and further to the downstream conveyor 12. It is carried out.

  Further, when the mask sheet 51 is cleaned, the moving beam 75 including the cleaning unit 80 is sent into a space generated below the mask sheet 51 by the lowering of the printing stage 10. Then, the cleaning head 81 of the cleaning unit 80 rises and the wiping tape 82 comes into contact with the lower surface of the mask sheet 51. In this state, the cleaning unit 80 moves in the Y-axis direction along the lower surface of the mask sheet 51. At the same time, the suction device 87 is actuated to suck out air from the cleaning head 81.

  As a result, a suction force acts on the mask sheet 51 from the suction opening 83 via the wiping tape 82, and the solder paste adhering to the mask sheet 51 is sucked and wiped off by the wiping tape 82.

  Further, during this cleaning, the air sucked from the cleaning unit 80 passes through the filter 86 from the first intake pipe 85a, and after the solder paste and other foreign matters mixed in the air are filtered by the filter 86, The air is sucked into the suction device 87 through the second intake pipe 85b. Further, the air flowing out from the discharge port of the suction device 87 is discharged outside the printing press through the exhaust pipe 88 and the muffler 89.

  In order to clean the mask sheet 51 as described above, the cleaning device 8 including the cleaning unit 80, the filter 86, the suction device 87, the intake pipes 85a and 85b, the exhaust pipe 88, and the like is incorporated in the printing machine. In this printing machine, the members constituting the cleaning device 8 are compactly incorporated into the printing machine without interfering with other members. That is, the filter 86 is disposed here by utilizing an empty space existing in the rear portion outside the occupation range of the printing stage 10 on the base 2, and the suction device 87 is located on one side behind the base 2. The filter 86 and the suction device 87 can be made compact without taking extra space in the printing machine housing 1 while being arranged in the concave portion 201 formed in the printing section 10 while avoiding interference between them and the printing stage 10. Be placed.

  The first and second intake pipes 85a and 85b and the exhaust pipe 88 are also laid out in the printing press housing 1 so as not to interfere with other members. Further, since the downstream side of the exhaust pipe 88 is led out of the printing press housing 1, the exhaust from the exhaust pipe 88 does not adversely affect the printing operation or the like. Further, if a muffler 89 is provided at the end of the exhaust pipe 88, silence can be improved.

  Further, since the filter 86 clogs the filter element 863 when used for a long period of time, it is necessary to periodically clean or replace the filter 86, but the printing press housing 1 located outside the filter installation location. Since the rear surface portion is provided with a cover 110 that can be opened and closed, if the cover 110 is opened, maintenance inspection such as cleaning and replacement of the filter 86 can be easily performed.

  Further, since the suction device 87 is also arranged at a position close to the cover 110, maintenance and inspection of the suction device 87 can be easily performed. Further, by disposing the suction device 87 in the recess 201 provided in the base 2, it is possible to avoid the thermal influence on the printing stage 10. That is, the suction device 87 itself generates heat, and the air in the exhaust pipe 88 on the downstream side of the suction device 87 is also hot. However, by arranging the suction device 87 and the exhaust pipe 88 on the lower side of the base 2, printing is performed. It is possible to prevent thermal influence on the stage 10.

  In addition, the specific structure of the screen printing machine of this invention is not limited to the said embodiment, A various change is possible.

  For example, in the above embodiment, the filter 86 is disposed in the rear part on the base 2, but the filter 86 may be disposed in an empty space in the front part on the base 2.

  Further, in the above embodiment, the covers 110 are provided on both the front and rear sides of the printing machine housing 1, but the covers 110 may be provided only at locations outside the filter 86.

  Further, the cover 110 that is arranged so as to be openable and closable so that the rear portion of the printing stage 10 can be inspected together with the filter 86 is configured to be positioned slightly from the lower part to the upper part of the upper surface of the base 2, and A cover that covers the concave portion 201 that opens to the rear end or the rear end of the side end of the base 2 may be provided independently of the cover 110 and configured to be openable and closable.

  In the above embodiment, the suction device 87 is disposed below the upper surface of the base 2 so that another device can be disposed in the space above the base 2. Alternatively, the suction device 87 may be arranged using an empty space existing in the rear part or the front part.

It is a side view of the screen printer concerning one embodiment of the present invention. It is a front view of the printing machine. It is a schematic perspective view showing the positional relationship of each part of the printing press. It is a schematic perspective view which shows the camera unit and cleaning unit of the said printing machine. It is the schematic perspective view which looked at the cleaning head from the printing machine back side. It is a rear view which shows arrangement | positioning of each member of the cleaning apparatus in the said printing machine. It is a top view which shows arrangement | positioning of each member of the said cleaning apparatus. It is a side view which shows arrangement | positioning of each member of the said cleaning apparatus. It is sectional drawing which shows a filter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing press housing 2 Base 10 Printing stage 5 Mask sheet holding unit 51 Mask sheet 6 Squeegee unit 61 Squeegee 8 Cleaning device 80 Cleaning unit 85a, 85b Intake pipe 850 Bare cable (intake pipe support member)
86 Filter 87 Suction device 88 Exhaust pipe 89 Muffler W Printed circuit board

Claims (6)

A printing stage for supporting a substrate to be printed is provided on a base in a printing machine housing, and a mask sheet holding unit for holding a mask sheet is provided above and a solder paste is applied to the substrate through the mask sheet. In a screen printing machine provided with a squeegee unit and provided with a cleaning device for removing solder paste adhered to the mask sheet,
The cleaning device
A cleaning unit disposed below the mask sheet installation location and movable in a certain direction;
A filter disposed outside the range occupied by the printing stage on the base and connected to the cleaning unit via a first intake pipe;
A suction device connected to the filter via a second intake pipe;
With
A screen printing machine, wherein the printing machine housing is provided with an openable / closable cover at least at a position located outside the filter.   2. The screen printing machine according to claim 1, wherein the filter is disposed above the upper surface of the base, while the suction device is disposed below the upper surface of the base.   3. A screen printing machine according to claim 2, wherein a recess is formed at the end of the base on the side where the cover is provided, and a suction device is installed in the recess.   The upstream portion of the first intake pipe is supported by a deformable intake pipe support member. The intake pipe support member is bent at an intermediate portion so that one end is connected to the cleaning unit and the other end is a fixed frame. The screen printing according to any one of claims 1 to 3, wherein the screen printing is connected, and a downstream portion of the first intake pipe is fixedly arranged from the fixed frame to the filter. Machine.   The exhaust pipe is connected to the suction device, and a discharge side end portion of the exhaust pipe is led out to the outside through a side wall of the printer main body housing. Screen printing machine.   6. The screen printing machine according to claim 5, wherein a muffler is provided at a discharge side end of the exhaust pipe.

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