JP4946364B2 - SCREEN PRINTING APPARATUS AND SUBJECT EXCHANGE METHOD FOR SCREEN PRINTING APPARATUS - Google Patents

Description

  The present invention relates to a screen printing apparatus that prints a paste such as cream solder or conductive paste on a substrate, and a base replacement operation in a screen printing apparatus that replaces a base receiving portion that supports and holds the substrate in the screen printing apparatus. It is about the method.

In screen printing in which a paste such as cream solder or conductive paste is printed on a substrate in an electronic component mounting process, the substrate needs to be in close contact with the mask plate and held in a correct posture. For this reason, the substrate positioning portion that positions and holds the substrate is provided with a substrate receiving portion that contacts and supports the lower surface of the substrate (see, for example, Patent Document 1). Here, an example is shown in which a suction block that holds the substrate from the lower surface by vacuum suction is used as the substrate receiving portion. The substrate receiving portion is detachably mounted on the lower surface of the substrate held by the substrate transport mechanism, and is detachably mounted on the upper surface (that is, the lower mounting surface) of the lifting mechanism that performs this contact / separation operation. . Then, every time the board type to be produced is switched, a board exchange operation for exchanging the board lowering part with one corresponding to the board type is executed.
JP-A-7-214748

  The board support section has various forms and sizes depending on the type of the corresponding board, and when replacing the support, pay careful attention to the correspondence with the board and the mounting position to prevent work mistakes. There is a need to. However, in the screen printing apparatus shown in the above-mentioned patent document example, a measure for preventing work mistakes in the base replacement work is not taken into consideration, and whether or not the board base is correctly attached is determined only by the skill of the operator. Relied on degree and attention.

  That is, in the prior art, the base replacement work has been performed in a state where the base mounting surface is lowered by an elevating mechanism from the viewpoint of ensuring work clearance as much as possible. For this reason, when aligning the substrate support part with the support mounting surface, the positional relationship between the substrate transfer mechanism, such as a transport rail that supports and transports the substrate, and the substrate support part is directly visually confirmed. In some cases, it is difficult to perform the operation, such as selecting the position of the mounting hole by mistake of the operator, or mounting other types of products having different dimensions. When a printing operation is started with such an operation error being overlooked, the substrate receiving portion raised by the elevating mechanism interferes with the substrate transport mechanism, and in some cases, the apparatus is damaged. Such work mistakes have become a more prominent problem due to an increase in the frequency of product switching due to the normalization of recent multi-product and small-volume production.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a screen printing apparatus and a base replacement work method for a screen printing apparatus that can prevent the apparatus from being damaged due to a work mistake in the base replacement work.

In the screen printing apparatus of the present invention, the substrate is brought into contact with the mask plate provided with the pattern hole, the paste is supplied onto the mask plate, and the squeegee is slid, whereby the paste is applied to the substrate through the pattern hole. A screen printing apparatus for printing, a substrate transport mechanism for transporting the substrate from a upstream side to a printing position by a transport rail and transporting the substrate from the printing position to a downstream side, and receiving the substrate transported to the printing position from below And a substrate receiving part that is detachably mounted on the lower mounting surface, and a lowering / lowering means that moves the lifting part provided with the lower mounting surface relative to the substrate transport mechanism. Stop height position setting means for setting and storing a stop height position of the lifting / lowering part in the lifting / lowering operation by the lower / lowering lifting / lowering means, and the stop height position is located in front of the substrate receiving part. Including a base replacement work height position set to execute a base replacement work to be mounted on the base mounting surface. A first height position where positional interference occurs between the substrate receiving portion and the transport rail when the substrate receiving portion is mounted at an abnormal position with respect to the mounting surface, and the substrate receiving portion is the lower mounting surface. Among the heights in which positional interference between the substrate receiving portion and the transport rail occurs when mounted at an abnormal position with respect to the height position, the height position is different from the first height position. And a second height position where a lower surface contacting the substrate in the substrate lowering portion coincides with a substrate conveying surface by the conveying rail, and the substrate lowering portion is abnormal with respect to the lower mounting surface. When mounted in a position, the height of the position where the positional interference between the substrate support and the transport rail occurs. Chi, the first a height position different from height position, the third height position of the lower receiving surface is positioned downward by the substrate thickness of the upper surface of the clamp member which clamps sandwich the substrate from both sides One of them.

In the screen printing apparatus according to the present invention, the substrate replacement work method is such that the substrate is brought into contact with the mask plate provided with the pattern hole, the paste is supplied on the mask plate, and the squeegee is slid to slide the pattern hole. In a screen printing apparatus for printing paste on a substrate via a screen, the screen printing apparatus for receiving and holding the substrate conveyed from below and replacing the substrate receiving portion that is detachably mounted on the lower mounting surface The screen printing apparatus is transported to the printing position by a substrate transport mechanism for transporting the substrate from the upstream side to the printing position and transporting the substrate from the printing position to the downstream side by a transport rail. A substrate lower receiving portion that receives and holds the substrate from below and is detachably mounted on the lower mounting surface, and an elevation provided with the lower mounting surface And a lower / lifting / lowering means for moving the board lower / lower relative to the substrate transport mechanism, and when performing the lowering / replacement operation for mounting the substrate lowering portion on the lower mounting / mounting surface, The raising and lowering part is moved up and down to hold the lower attachment mounting surface at a lower position for the lower base replacement work set in advance for the lower base replacement work. the first height position positional interference between the transfer rail and the board bearing portion when said board bearing portion is attached to the non-normal position relative to the lower受装deposition surface occurs, the substrate Of the heights that cause positional interference between the substrate support portion and the transport rail when the support portion is mounted at an abnormal position with respect to the support mounting surface, the first height is selected. a position and different heights, the lower abutting the substrate in said board bearing portion receiving surface The second and the height position corresponding to the substrate transport surface by the conveying rails, when the board bearing portion is attached to the non-normal position relative to the lower受装deposition surface and the substrate lower support conveyor The height of the substrate from the top surface of the clamp member that is different from the first height position among the heights at which positional interference with the rail occurs and the lower surface sandwiches the substrate from both sides and clamps it. It is one of the third height positions located below by the minute.

  According to the present invention, when performing the base replacement operation for mounting the base plate mounting portion on the base mounting surface, the lifting portion provided with the base mounting surface is moved up and down by the base lifting and lowering means, so By holding at the base stop height position set for the replacement work, it is possible to directly check the positional relationship between the substrate transport mechanism and the base support part, resulting from work mistakes in the base replacement work. Damage to the device can be prevented.

  Next, embodiments of the present invention will be described with reference to the drawings. 1 is a side view of a screen printing apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the screen printing apparatus according to an embodiment of the present invention, and FIG. 3 is a screen printing apparatus according to an embodiment of the present invention. FIG. 4 is a diagram for explaining the configuration of the substrate receiving portion of the screen printing apparatus according to the embodiment of the present invention. FIG. 5 is a block diagram showing the configuration of the control system of the screen printing apparatus according to the embodiment of the present invention. FIG. 6, FIG. 7, FIG. 7, FIG. 8 and FIG. 9 are explanatory views of a method for replacing a base in a screen printing apparatus according to an embodiment of the present invention. FIG. 10 and FIG. It is explanatory drawing of.

  First, the structure of the screen printing apparatus will be described with reference to FIG. 1, FIG. 2, and FIG. In FIG. 1, the screen printing apparatus is configured by disposing a screen printing mechanism above a substrate positioning unit 1. The substrate positioning unit 1 is configured by stacking a Y-axis table 2, an X-axis table 3, and a θ-axis table 4, and further combining a first Z-axis table 5 and a second Z-axis table 6 thereon. Yes.

  The configuration of the first Z-axis table 5 will be described. Similarly, on the upper surface side of the horizontal base plate 4 a provided on the upper surface of the θ-axis table 4, the horizontal base plate 5 a is held up and down by an elevating guide mechanism (not shown). The base plate 5a is moved up and down by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 5c via a belt 5d by a transport rail lifting motor 5b. Vertical frames 5e and 5f are erected on the base plate 5a, and two transport rails 8a constituting the substrate transport mechanism 8 are held at upper ends of the vertical frames 5e and 5f.

The transport rails 8a are arranged in parallel to the substrate transport direction (X direction--the direction perpendicular to the paper surface in FIG. 1), and the both ends of the substrate 10 to be printed are moved by the substrate transport conveyors provided on these transport rails 8a. Transport in support. Here, of the vertical frames 5e and 5f, one vertical frame 5f is slidable in the Y direction by a slide mechanism including a guide rail 5g and a slider 5h arranged in the Y direction on the upper surface of the base plate 5a. That is, among the two transport rails 8a, the transport rail 8a held by the vertical frame 5f is movable in the Y direction so that the transport width of the substrate transport mechanism 8 can be changed according to the substrate type. It has become.

  By driving the first Z-axis table 5, the substrate 10 held by the substrate transport mechanism 8 can be lifted and lowered with respect to the screen printing mechanism described later together with the transport rail 8 a. As shown in FIGS. 2 and 3, the substrate transport mechanism 8 extends to the upstream side (left side in FIGS. 2 and 3) and the downstream side, and the substrate 10 carried from the upstream side is transported by the substrate transport mechanism 8. Further, the substrate positioning unit 1 positions the printing position by the screen printing mechanism. Then, the substrate 10 after being printed by the screen printing mechanism is carried out downstream by the substrate transport mechanism 8.

  The configuration of the second Z-axis table 6 will be described. A horizontal base plate 6a is disposed between the substrate transport mechanism 8 and the base plate 5a so as to be movable up and down along a lifting guide mechanism (not shown). The base plate 6a is lifted and lowered by a Z-axis lifting mechanism configured to rotationally drive a plurality of feed screws 6c via a belt 6d by a lower part lift motor 6b. The upper surface of the base plate 6a is a lower mounting surface 6e for mounting the substrate lower receiving portion 7 provided with a lower receiving surface for holding the substrate 10 on the upper surface. The part 7 is detachably mounted.

  The substrate receiving unit 7 receives and holds the substrate conveyed from below to the printing position by the screen printing mechanism. Accordingly, the base plate 6 a is an elevating part provided with a lower mounting surface 6 e for mounting the substrate lower receiving part 7, and the second Z-axis table 6 moves the base plate 6 a, which is an elevating part, to the substrate transport mechanism 8. It is a lowering and raising means for moving up and down relatively. The substrate receiving portion 7 shown in FIGS. 1 and 2 is intended for a substrate having a flat bottom surface and capable of supporting the entire surface, such as a bottom surface side of a one-side mounting substrate or an unmounted surface of a double-side mounting substrate. is there. On the other hand, when targeting an already mounted substrate in which electronic components are already mounted on one side in the previous step in a double-sided mounting substrate, as described later, a dedicated under plate corresponding to each substrate is provided. A substrate support is used.

  By driving the second Z-axis table 6, the substrate receiving unit 7 moves up and down with respect to the substrate 10 held by the substrate transport mechanism 8. Then, the substrate receiving portion 7 supports the substrate 10 from the lower surface side when the lower surface of the substrate receiving portion 7 contacts the lower surface of the substrate 10. A clamp mechanism 9 is disposed on the upper surface of the substrate transport mechanism 8. The clamp mechanism 9 includes two clamp members 9a that are disposed opposite to each other on the left and right sides, and the clamp member 9a on one side is advanced and retracted by the drive mechanism 9b to clamp and fix the substrate 10 from both sides (see FIG. (See also 3).

  Next, the screen printing mechanism disposed above the substrate positioning unit 1 will be described. 1 and 2, a mask plate 12 is extended on a mask frame 11 held by a mask holder (not shown). The shape and position of an electrode 10 a to be printed on the substrate 10 are extended on the mask plate 12. Corresponding to (see FIG. 3), pattern holes 12a are provided. A squeegee driving mechanism 13 is disposed on the mask plate 12. The squeegee driving mechanism 13 has a structure in which two squeegee raising / lowering mechanisms 15 for raising and lowering a pair of squeegee heads 16 arranged opposite to each other are arranged on a horizontal plate 14. A plate-like squeegee member 16a is held on each squeegee head 16B coupled to the lifting shaft 15a of each squeegee lifting mechanism 15.

  By driving the squeegee raising / lowering mechanism 15, the squeegee head 16 moves up and down, whereby the squeegee member 16 a comes into contact with the upper surface of the mask plate 12. A feed screw 18 that is rotationally driven by a squeegee moving motor 17 is screwed onto a nut 19 fixed to the lower surface of the plate 14. By driving the squeegee moving motor 17, the squeegee head 16 moves together with the plate 14 in the Y direction. Move horizontally in the direction.

  As shown in FIG. 2, a guide rail 23 is disposed in the Y direction on a bracket 22 disposed on the vertical frame 21, and a slider 24 slidably fitted on the guide rail 23 is provided on the plate 14. Connected to both ends. Thereby, the squeegee drive mechanism 13 is slidable in the Y direction. The plate 14 is horizontally moved in the Y direction by a squeegee moving means including a nut 19, a feed screw 18 and a squeegee moving motor 17 (see FIG. 1) that rotationally drives the feed screw 18.

  In FIG. 2, a guide rail 27 is disposed on the vertical frame 21 in the Y direction. A slider 28 slidably fitted to the guide rail 27 is coupled to the head X-axis table 26 via a bracket 26a. Yes. Thereby, the head X-axis table 26 is slidable in the Y direction. The head X-axis table 26 is horizontally moved in the Y direction by a head Y-axis moving mechanism 25 including a nut 30, a feed screw 29, and a head moving motor (not shown) that rotationally drives the feed screw 29.

  As shown in FIGS. 1 and 2, the camera head unit 20 is mounted on the head X-axis table 26. The camera head unit 20 includes a substrate recognition camera 20a for imaging the substrate 10 from above, and a mask recognition camera 20b for imaging the mask plate 12 from the lower surface side. The head Y-axis moving mechanism 25, the head By driving the X-axis table 26 and moving the camera head unit 20, recognition of the substrate 10 and recognition of the mask plate 12 can be performed simultaneously. When the substrate 10 and the mask plate 12 are not recognized by the camera head unit 20, the camera head unit 20 is in a position retracted from the upper side of the substrate positioning unit 1 as shown in FIG.

  Next, the printing operation by the screen printing mechanism will be described with reference to FIG. First, when the substrate 10 is carried into the printing position by the substrate transport mechanism 8, the second Z-axis table 6 is driven to raise the substrate receiving portion 7 and receive the lower surface of the substrate 10. In this state, the substrate positioning unit 1 is driven to align the substrate 10 with the mask plate 12. Thereafter, the first Z-axis table 5 is driven to raise the substrate 10 together with the substrate transport mechanism 8 so as to contact the lower surface of the mask plate 12 provided with the pattern holes 12a. Clamp. Thereby, the horizontal position of the board | substrate 10 is fixed in the squeegee which moves squeegee head 16A, 16B by the squeegee drive mechanism 13. FIG.

  Then, in this state, one of the two squeegee heads 16 is lowered corresponding to the squeegeeing direction in the squeezing operation, and the squeegee member 17 is brought into contact with the mask plate 12. Next, the cream solder is printed on the substrate 10 through the pattern holes 12a by sliding the squeegee member 17 in the squeegeeing direction (Y direction) on the mask plate 12 to which cream solder as paste is supplied. .

Next, with reference to FIG. 4, the board receiving portion 7 </ b> A used for the already mounted surface of the double-sided mounting board will be described. As shown in FIG. 4A, when the substrate to be received is the substrate 10A having the mounted component P on the lower surface, the substrate receiving portion 7 having the flat upper surface as described above is used. I can't. In such a case, the substrate receiving portion 7A having a configuration in which the lower receiving plate 71 provided with the recesses 71a corresponding to the arrangement of the electronic components P on the substrate 10A is held by the holding block 70 as the substrate receiving portion 7A. Is used. When receiving the substrate 10A by the substrate receiving portion 7A, as shown in FIG. 4B, the lower receiving plate 71 is brought close to the lower surface of the substrate 10A, and the electronic component P is inserted into the recess 71a. Thus, the lower receiving plate 71 is brought into contact with a portion where the electronic component P does not exist on the lower surface of the substrate 10A.

  In the case where the substrate receiving portion 7A having such a configuration is used, there has been a considerable frequency of occurrence of damage to the apparatus due to an operation mistake at the time of replacing the support. In other words, in the prior art, when the support replacement work is performed, the base plate 6a is lowered in the second Z-axis table 6 as shown in FIG. For this reason, as shown in FIG. 10 (b), the operation of aligning the substrate receiving portion 7A in the horizontal direction in order to attach the substrate receiving portion 7A to the receiving mounting surface 6e is performed downward from the substrate transport mechanism 8. It was carried out at a position separated from each other.

  For this reason, it is difficult for the operator to confirm in detail the horizontal relative positional relationship between the lower support plate 71 and the substrate transport mechanism 8 on the upper portion of the substrate support portion 7A, and the substrate support portion 7A is originally mounted. There is a situation in which the end of the lower plate 71 is erroneously mounted due to a positional relationship in which the end of the lower plate 71 is slightly submerged directly below the transport rail 8a of the substrate transport mechanism 8 from the position to be horizontally shifted (see arrow a). It was. Such a work mistake may be a mistake in the combination of the mounting hole and the fastening hole that should be originally selected when the mounting hole provided in the holding block 70 is aligned with the fastening hole provided in the lower mounting surface 6e. It often occurs when the operator has neglected careful attention.

  Then, when the printing operation is started with this operation error being overlooked, as shown in FIG. 11A, the substrate transport mechanism 8 keeps the substrate receiving portion 7A displaced from the correct position, as shown in FIG. Is brought into the printing position. Then, when the base plate 6a is raised by driving the lower receiving part raising / lowering motor 6b in this state, as shown in FIG. 11 (b), the lower receiving plate 71 mounted in a positional relationship to be submerged under the transport rail 8a. Of the substrate interferes with the transport rail 8a, and equipment troubles such as deformation and breakage of the substrate transport mechanism 8 occur. In the screen printing apparatus shown in the present embodiment, the height of the base plate 6a at the time of replacing the base plate as will be described later in order to prevent problems caused by work mistakes at the time of aligning the substrate base portion. The position is set to a height position at which no alignment error inherently occurs.

  Next, the configuration of the control system will be described with reference to FIG. In FIG. 5, only the part related to the function for preventing an operation error at the time of alignment of the above-described substrate support part is shown in the overall control system of the screen printing apparatus. The control unit 31 controls operation processing of each unit described below. The drive unit 34 is a motor driver for driving the receiving unit lifting / lowering motor 6 b of the second Z-axis table 6, and drives the receiving unit lifting / lowering motor 6 b according to a control command from the control unit 31.

  The stop height position setting processing unit 32 has a processing function for setting the stop height position of the base plate 6a in the raising / lowering operation of the base plate 6a by the lower part raising / lowering motor 6b. The stop height position storage unit 33 stores the stop height position set by the stop height position setting processing unit 32. Accordingly, the stop height position setting processing unit 32 and the stop height position storage unit 33 are set as stop height position setting means for setting and storing the stop height position of the base plate 6a (elevating part) in the elevating operation by the lower elevating means. It has become. Here, by setting the stop height position, the height position of the base plate 6a at the time of performing the base replacement operation for mounting the base plate support on the base plate 6a is defined.

That is, in the present embodiment, this stop height position is a height position for the base replacement work that is set in order to perform the base replacement work for mounting the board base part on the base mounting surface 6e. It is a form to include. By predefining the height position for the base replacement work in this way, as described below, in mounting the board base 7A on the base mounting surface 6e, the horizontal position shift is overlooked. It is possible to eradicate work mistakes that would be made.

  Next, in the above-described screen printing apparatus, a base replacement operation method for replacing the base support will be described with reference to FIGS. Here, an example of work in the case where the substrate support 7 shown in FIG. 1 is removed and the substrate support 7A is newly mounted is shown. FIG. 6 shows an operation of removing the substrate receiving part 7 for the substrate 10. As shown in FIG. 6A, when the printing operation for the substrate 10 is completed, the substrate receiving portion 7 is lowered together with the base plate 6a. Then, as shown in FIG. 6B, after the substrate 10 is carried downstream by the substrate transport mechanism 8, the substrate lower receiving portion 7 is removed from the lower mounting surface 6 e. Thereby, as shown in FIG.6 (c), the upper surface of the baseplate 6a will be in a free state. Then, the vertical frame 5f is slid to set the movable conveyance rail 8a to the conveyance width corresponding to the new substrate 10A, so that the substrate receiving portion corresponding to the substrate 10A can be mounted.

  Next, the mounting of a new substrate receiving portion 7A is performed. In the present embodiment, the height position of the base plate 6a when mounting the substrate receiving portion 7A on the receiving mounting surface 6e, that is, the height position for receiving replacement work is shown in FIGS. As shown, each can be appropriately selected from three height positions.

  The first height position shown in FIG. 7 will be described. FIG. 7A shows the state shown in FIG. 6C. From this state, as shown in FIG. 7B, the base plate 6a is set in advance by the stop height position setting processing unit 32, and the stop height position is set. The first height position h1 stored in the storage unit 33 is raised. Here, the first height position h1 refers to the position between the substrate support portion 7A and the transport rail 8a when the substrate support portion 7A is mounted at an abnormal position with respect to the support mounting surface 6e. It is a height position where general interference occurs. More specifically, the distance d1 from the lower surface of the conveyor portion protruding inward on the transport rail 8a to the lower mounting surface 6e is the total thickness dimension of the holding block 70 and the lower receiving plate 71 that constitute the substrate lowering portion 7A. It is the height position of the base plate 6a which becomes smaller.

  Then, with the base plate 6a in such a first height position h1, as shown in FIG. 7 (c), the base plate receiving portion 7A is aligned with the base mounting position on the base mounting surface 6e and mounted. To do. By performing the support replacement operation in such a state, if the horizontal alignment of the substrate support portion 7A on the support mounting surface 6e is abnormal due to an operation error, the substrate support portion 7A The end portion always interferes with the transport rail 8a (see FIG. 11B). As a result, the operator can reliably recognize that there is a misalignment, and can prevent problems caused by continuing work while overlooking work mistakes.

Next, the second height position shown in FIG. 8 will be described. FIG. 8A shows the state shown in FIG. 6C. From this state, as shown in FIG. 8B, the base plate 6a is set in advance by the stop height position setting processing unit 32, and the stop height position is set. It is raised to the second height position h2 stored in the storage unit 33. Here, the second height position h2 is a height at which the lower receiving surface 71b in contact with the substrate 10A in the substrate lower receiving portion 7A coincides with the substrate transfer surface 8b by the transfer rail 8a. More specifically, the distance d2 from the upper surface of the conveyor portion protruding inward on the transport rail 8a to the lower mounting surface 6e is the total thickness dimension of the holding block 70 and the lower receiving plate 71 constituting the substrate receiving portion 7A. Is the height position of the base plate 6a.

Then, with the base plate 6a in such a second height position h2, as shown in FIG. 8 (c), the base plate receiving portion 7A is mounted in alignment with the base plate 6a. By performing the base replacement work in such a state, in addition to the effect of preventing the above-mentioned work mistakes, the base plate receiving portion 7A is positioned on the base mounting surface 6e and temporarily placed on the base plate 10A. Can be held by the transport rail 8a and the substrate receiving portion 7A. Thereby, it is possible to confirm whether the alignment of the substrate receiving portion 7A is good or not, together with whether or not the arrangement of the electronic components P on the lower surface of the substrate 10A matches the recess 71a of the receiving plate 71. . Here, the distance d2 does not need to be completely coincident with the above-mentioned total thickness dimension, and may be coincident to the extent that the quality of the alignment can be easily confirmed.

  Next, the third height position shown in FIG. 9 will be described. FIG. 9A shows the state shown in FIG. 6C. From this state, as shown in FIG. 9B, the base plate 6a is set in advance by the stop height position setting processing unit 32 and the stop height position is set. It is raised to the third height position h3 stored in the storage unit 33. Here, the third height position h3 is a height at which the lower surface of the substrate receiving portion 7A is positioned below the upper surface of the clamp member 9a that clamps the substrate 10A from both sides by the thickness of the substrate. That's it. More specifically, the distance d3 from the upper surface of the clamp member 9a to the lower mounting surface 6e matches the total thickness dimension of the holding block 70, the lower receiving plate 71, and the substrate 10A constituting the substrate lower receiving portion 7A. This is the height position of the base plate 6a.

  Then, in a state where the base plate 6a is at the third height position h3, as shown in FIG. 9C, the base plate receiving portion 7A is mounted in alignment with the base plate 6a. By performing the support replacement operation in such a state, in addition to the above-described work error prevention effect, the substrate support 10A is placed in a state where the substrate support 7A is positioned on the support mounting surface 6e and temporarily placed. It can be held on the substrate receiving portion 7A in a state substantially equal to the actual clamped state. Thereby, it is possible to confirm the quality of the alignment in the height direction together with the alignment in the horizontal direction of the substrate receiving portion 7A.

  That is, in the above-described base replacement work method, when performing base replacement work for attaching and detaching the substrate base part to the base mounting surface 6e, the base plate 6a is moved up and down by the base lifting and lowering means so that the base mounting surface 6e is moved. It is held at the height position for the undercarriage replacement work, which is the stop height position set in advance for the undercarriage exchange work. As a result, it is possible to directly confirm the positional relationship between the substrate transport mechanism and the substrate support part, and it is possible to prevent damage to the apparatus due to an operation error in the support replacement operation. In the present embodiment, any one of the first height position h1, the second height position h2, and the third height position h3 can be selected as the height position for the support replacement work. It is like that. As a result, it is possible to more reliably check the alignment state of the substrate support portion in the support replacement operation.

  In the present embodiment, as a form of the substrate receiving portion, there is a block-shaped substrate receiving portion 7 having a flat receiving surface for a substrate having a flat lower surface, and the already mounted component P exists on the lower surface. Two examples of the substrate lower receiving portion 7A having the structure in which the substrate 10A is the target and the lower receiving plate 71 is held by the holding block 70 are shown, but the present invention is not limited to these forms. Any configuration that can be detachably mounted on the receiving / mounting surface 6e is an application target of the present invention.

  INDUSTRIAL APPLICABILITY The screen printing apparatus and the screen printing method of the present invention have an effect of preventing the apparatus from being damaged due to a work mistake in the substituting replacement work, and are useful for printing solder on a substrate.

The side view of the screen printing apparatus of one embodiment of this invention 1 is a front view of a screen printing apparatus according to an embodiment of the present invention. The top view of the screen printing apparatus of one embodiment of this invention Structure explanatory drawing of the board | substrate receiving part of the screen printing apparatus of one embodiment of this invention The block diagram which shows the structure of the control system of the screen printing apparatus of one embodiment of this invention Explanatory drawing of the base exchange work method in the screen printing apparatus of one embodiment of this invention Explanatory drawing of the base exchange work method in the screen printing apparatus of one embodiment of this invention Explanatory drawing of the base exchange work method in the screen printing apparatus of one embodiment of this invention Explanatory drawing of the base exchange work method in the screen printing apparatus of one embodiment of this invention Explanatory diagram of under-compliance in conventional screen printing devices Explanatory diagram of under-compliance in conventional screen printing devices

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate positioning part 5 1st Z-axis table 6 2nd Z-axis table (under-lifting means)
6a Base plate 6b Lower part raising / lowering motor 6e Lower part mounting surface 7, 7A Substrate lower part 8 Substrate conveying mechanism 8a Conveying rail 8b Substrate conveying surface 9 Clamp mechanism 9a Clamp member 10, 10A Substrate 70 Holding block 71 Lower receiving plate

Claims (2)

A screen printing apparatus for printing a paste on a substrate through the pattern hole by bringing the substrate into contact with a mask plate provided with a pattern hole, supplying paste onto the mask plate, and sliding a squeegee. ,
A substrate transport mechanism that transports the substrate from the upstream side to the printing position by the transport rail and transports the substrate from the printing position to the downstream side, and receives and holds the substrate transported to the printing position from below on the bottom mounting surface. A base plate receiving portion that is detachably mounted, a base lifting and lowering means that lifts and lowers a lifting portion provided with the base mounting surface relative to the substrate transport mechanism, and a lifting operation by the base lifting and lowering means. And a stop height position setting means for setting and storing a stop height position of the elevating part in
The stop height position includes a base replacement work height position set in order to perform a base replacement work for mounting the substrate base part on the base mounting surface,
The height position for the base replacement operation is such that positional interference between the base plate receiving portion and the transport rail when the base plate receiving portion is mounted at an abnormal position with respect to the base mounting surface. When the substrate receiving portion is mounted at an abnormal position with respect to the lower mounting surface, positional interference occurs between the substrate receiving portion and the transport rail. Of the heights, the second height is a height position different from the first height position, and the receiving surface that contacts the substrate in the substrate receiving portion coincides with the substrate transfer surface by the transfer rail. Of the position and the height at which positional interference occurs between the substrate support and the transport rail when the substrate support is mounted at an abnormal position with respect to the support mounting surface. a height position different from the first height position, Kura the lower receiving surface is sandwich the substrate from both sides Screen printing apparatus, characterized in that the upper surface of the are backing up the clamping member is either in the third height position located downward by the substrate thickness of. In a screen printing apparatus that prints a paste on a substrate through the pattern holes by contacting the substrate with a mask plate provided with pattern holes, supplying paste onto the mask plate, and sliding a squeegee A substrate replacement work method in a screen printing apparatus for receiving and holding a substrate conveyed to a position from below and exchanging a substrate substrate portion that is detachably mounted on a substrate mounting surface,
The screen printing apparatus has a substrate transport mechanism that transports the substrate from the upstream side to the print position and transports the substrate from the print position to the downstream side by a transport rail, and receives and holds the substrate transported to the print position from below. A base plate receiving portion that is detachably mounted on the base mounting surface; and a base lifting and lowering means that moves the lifting portion provided with the base mounting surface relative to the substrate transport mechanism. ,
When performing a base replacement operation for mounting the base plate mounting portion on the base mounting surface, the base lifting / lowering means is moved up and down by the base lifting / lowering means so that the base mounting surface is previously used for the base replacement operation. It is held at the set height position for undercarriage replacement work.
The height position for the base replacement operation is such that positional interference between the base plate receiving portion and the transport rail when the base plate receiving portion is mounted at an abnormal position with respect to the base mounting surface. When the substrate receiving portion is mounted at an abnormal position with respect to the lower mounting surface, positional interference occurs between the substrate receiving portion and the transport rail. Of the heights, the second height is a height position different from the first height position, and the receiving surface that contacts the substrate in the substrate receiving portion coincides with the substrate transfer surface by the transfer rail. Of the position and the height at which positional interference occurs between the substrate support and the transport rail when the substrate support is mounted at an abnormal position with respect to the support mounting surface. a height position different from the first height position, Kura the lower receiving surface is sandwich the substrate from both sides Lower receiving replacement method in the screen printing apparatus, characterized in that the upper surface of the are backing up the clamping member is either in the third height position located downward by the substrate thickness of.

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