JP5884009B2 - Screen printing machine and mask tension measuring method for screen printing machine - Google Patents

Description

  The present invention relates to a screen printing machine for printing a paste on a substrate through a mask and a mask tension measuring method for the screen printing machine.

  A screen printer that prints paste such as solder on the board contacts the mask with the mask so that the electrode and the opening are aligned with the mask having an opening provided in accordance with the arrangement of the electrode on the board. Then, by sliding the squeegee on the mask supplied with the paste and scraping the paste, the paste is pushed into the opening of the mask and transferred to the electrode.

  In such a screen printing machine, the mask is usually a thin thickness in which an opening corresponding to the arrangement of the electrodes on the substrate is provided in the center of a sheet-like member made of resin (for example, polyester) whose periphery is fixed to a rectangular mask frame. The entire mask is almost flat due to the tension generated when the four sides of the sheet-like member are supported by the mask frame. However, as the number of times the mask is used increases, The tension of the entire mask (or the local tension of the metal plate portion) decreases due to the weight of the plate part and the downward tensile load when the plate is separated from the substrate. In some cases, the mask separation timing is delayed and printing failure occurs. For this reason, before starting the screen printing operation, the tension of the entire mask (and the local tension of the metal plate part) is measured, and if the degree of decrease in the tension of the mask exceeds a predetermined standard, The mask is exchanged. Conventionally, as a method for examining the degree of decrease in the tension of the mask, for example, a weight is attached to the mask before contacting the substrate and a constant downward load is applied to the mask. A method for obtaining the tension of the mask based on the relationship with the amount of displacement is known (for example, Patent Document 1).

JP 2001-62996 A

  However, when a weight is attached to the mask as described above to determine the tension of the mask, it is necessary to move the mask to a different location from the inside of the screen printer and hold the mask with a dedicated mask holding jig. There is a problem that the cost may increase in terms of workability and equipment.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a screen printing machine and a mask tension measuring method for a screen printing machine which can easily and quickly obtain the tension of the mask.

The screen printing machine according to claim 1, wherein the pair of clamp members that hold both sides of the substrate and the pair of clamp members that hold the substrate are relatively pressed from below, so that the pair of clamp members and A mask in contact with the upper surface of each of the substrates; a base member that is moved in a horizontal direction with respect to the mask; a squeegee shaft that extends downward from the base member and is movable up and down with respect to the base member; The squeegee attached to the lower end of the squeegee and the base member is moved in the horizontal direction with respect to the mask while the squeegee is in contact with the upper surface of the mask by the downward movement of the squeegee shaft. Transfer operation control means for scraping and transferring to the substrate, and descent amount detection for detecting the descent amount of the squeegee axis when the squeegee axis is moved downward A step, a load measuring means for measuring an axial load of the squeegee shaft, and a squeegee in contact with the mask on one of the clamp members in a state where the pair of clamp members are in contact with the mask, and then measured by the load measuring means. The lowering amount of the squeegee shaft detected by the lowering amount detecting means when the squeegee shaft is moved downward until the axial load of the squeegee shaft reaches a predetermined value is acquired as a first lowering amount, and then a pair of Measure by load measuring means after contacting the squeegee to the part of the mask that is not in contact with the pair of clamp members without separating the upper surface of the clamp member from the lower surface of the mask or the pair of clamp members from the mask. The squeegee shaft detected by the descending amount detecting means when the squeegee shaft is moved downward until the axial load of the squeegee shaft is equal to the predetermined value. A descending amount obtaining unit that obtains the descending amount as the second descending amount; and a tension calculating unit that calculates the mask tension from the difference between the first descending amount and the second descending amount obtained by the descending amount obtaining unit. Prepared.

  The screen printing machine according to claim 2 is the screen printing machine according to claim 1, wherein the load measuring means includes a load cell attached to an elastic body interposed between the squeegee shaft and the squeegee. Become.

The mask tension measuring method for a screen printing machine according to claim 3, wherein the pair of clamp members that hold both sides of the substrate and the pair of clamp members that hold the substrate are relatively pressed from below. The mask is in contact with the upper surfaces of the pair of clamp members and the substrate, the base member is moved in the horizontal direction with respect to the mask, and extends downward from the base member so as to be movable up and down with respect to the base member. The squeegee shaft, the squeegee attached to the lower end of the squeegee shaft, and the base member is moved horizontally with respect to the mask while the squeegee is in contact with the upper surface of the mask by the downward movement of the squeegee shaft. The transfer operation control means for scraping the paste supplied to the substrate with the squeegee and transferring it to the substrate, and the squeegee when the squeegee shaft is moved downward A method for measuring the tension of a mask of a screen printing machine comprising a descent amount detecting means for detecting a descent amount of the squeegee and a load measuring means for measuring an axial load of the squeegee shaft, wherein a pair of clamp members are brought into contact with the mask. After the squeegee is brought into contact with the mask on one of the clamp members, the squeegee shaft is moved downward until the axial load of the squeegee shaft measured by the load measuring means reaches a predetermined value. A step of acquiring the amount of lowering of the squeegee shaft detected by the means as a first amount of lowering, and after acquiring the first amount of lowering, the upper surfaces of the pair of clamp members are separated from the lower surface of the mask, without separating the member from the mask, after contacting the squeegee portion not in contact with the pair of clamping members of the mask is measured by the load measuring means The step of lowering the squeegee shaft until the axial load of the squeegee shaft reaches the predetermined value, and acquiring the lowering amount of the squeegee shaft detected by the lowering amount detection means as the second lowering amount, and And a step of calculating a mask tension from a difference between the first lowering amount and the second lowering amount.

  In the present invention, the squeegee shaft is moved downward until the axial load of the squeegee shaft reaches a predetermined value after the squeegee is brought into contact with the mask on one of the clamp members while the pair of clamp members are in contact with the mask. The squeegee shaft lowering amount (first lowering amount) detected when the squeegee is brought into contact with a portion of the mask that is not in contact with the pair of clamp members, and then the axial load of the squeegee shaft is the same. The amount of lowering of the squeegee shaft (second amount of lowering) detected when the squeegee shaft is moved downward until the value is obtained, and the mask tension (the tension of the entire mask or the metal plate) (The local tension of the part) is calculated, and it is not necessary to remove the mask from the screen printer during the mask tension measurement. And it can be quickly determined.

The principal part perspective view of the screen printer in one embodiment of this invention The side view of the screen printer in one embodiment of the present invention The top view of the mask hold | maintained at the mask holder with which the screen printing machine in one embodiment of this invention is equipped, and a mask holder The perspective view of the vicinity part of the squeegee with which the screen printer in one embodiment of this invention is provided The front view of the vicinity part of the squeegee with which the screen printer in one embodiment of this invention is provided The flowchart of the main routine which shows the operation | movement procedure of the screen printer in one embodiment of this invention. The subroutine flowchart which shows the operation | movement procedure of the screen printer in one embodiment of this invention. (A) (b) (c) Explanatory drawing of the procedure of the mask tension measuring operation of the screen printer in one embodiment of the present invention (A) (b) (c) Explanatory drawing of the procedure of the mask tension measuring operation of the screen printer in one embodiment of the present invention The graph explaining the calculation process of the mask tension of the screen printing machine in one embodiment of this invention (A) (b) Explanatory drawing of the procedure of the screen printing work by the screen printer in one embodiment of this invention (A) (b) Explanatory drawing of the procedure of the screen printing work by the screen printer in one embodiment of this invention (A) (b) Explanatory drawing of the procedure of the screen printing work by the screen printer in one embodiment of this invention

  Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a screen printing machine 1 executes a screen printing operation for screen printing a paste Pt such as solder on each of a large number of electrodes 3 provided on a substrate 2, and a base 10 (see FIG. 2). ) The substrate holding unit 11 provided above, a pair of mask holders 12 fixed to the base 10 so as to extend horizontally and parallel above the substrate holding unit 11, and the pair of mask holders 12 horizontally. The mask 13 held in the posture, the squeegee head 14 provided above the mask 13, the camera unit 15 provided in the area between the substrate holding unit 11 and the mask 13, the display device 16, and operation control of these parts are performed. A control device 17 is provided.

  1 and 2, the substrate holding unit 11 is moved (including rotation) in the horizontal plane (in the XY plane) and moved in the vertical direction (Z-axis direction) by a unit moving mechanism 11M composed of an XYZ robot. The unit base 21, the pair of conveyors 22 attached to the unit base 21 and transporting the substrate 2 in one direction (X-axis direction) in the horizontal plane, and the lower receiving part lifting cylinder 23 provided in the unit base 21 The substrate 2 is lifted from below and supported (see FIG. 2) so that both ends of the substrate 2 conveyed and positioned at a predetermined work position (position shown in FIG. 1) by the conveyor 22 are separated from the conveyor 22 upward. The receiving portion 24 and the substrate 2 are provided so as to be openable and closable in a horizontal plane direction (Y-axis direction) perpendicular to the transport direction (X-axis direction). Across Chiage supported on both sides of the substrate 2 from the Y-axis direction and a (clamps with) a pair of clamping members 25 for holding.

  In FIG. 3, a mask 13 includes a sheet-like member 13a made of resin (for example, polyester) whose four sides are supported by a mask frame 13W having a rectangular frame shape, and a thin metal plate 13b provided at the center of the sheet-like member 13a. In the metal plate 13b, a large number of openings 13h (see also FIG. 1) corresponding to the respective electrodes 3 on the substrate 2 and two substrate-side marks 2m (FIG. 1) provided on one diagonal line of the substrate 2 are formed. ), Two mask side marks 13m are provided. The mask 13 is supported from below by two pairs facing the X-axis direction by a pair of mask holders 12 arranged facing the X-axis direction (see also FIG. 1).

  4 and 5, the squeegee head 14 is moved in the horizontal direction (Y-axis direction) with respect to the mask 13 held by the mask holder 12 by a base member moving mechanism 14M (FIG. 1) including an actuator (not shown). A pair of (two) base plate members 31 extending downward from the base member 31 and freely movable up and down with respect to the base member 31 by a squeegee shaft vertical movement mechanism 32 provided on the base member 31. A squeegee shaft 33 and a squeegee unit 34 attached to the lower end of each squeegee shaft 33 are provided.

  Each squeegee unit 34 includes a squeegee holder 41 attached to the squeegee shaft 33 and a squeegee 42 made of a thin plate member attached to the squeegee holder 41 and extending in the X-axis direction. That is, each squeegee 42 is attached to the lower end of the squeegee shaft 33 via the squeegee holder 41, and the pair of squeegees 42 oppose the paste scraping surfaces 42a (FIG. 2) in the Y-axis direction.

  An operator (not shown) for operating the screen printing machine 1 is usually located on one side in the direction in which the two squeegees 42 face each other (Y-axis direction). The front side of the screen printer 1 and the opposite side are the rear side of the screen printer 1.

  4 and 5, a pair of guide rods 51 are provided extending in the vertical direction at a position sandwiching the squeegee shaft 33 on the upper surface of the squeegee holder 41. The pair of guide rods 51 extend through the base member 31 and a cylindrical rod guide portion 31a provided on the upper surface of the base member 31 in the vertical direction.

  4 and 5, each squeegee shaft 33 is formed of a ball screw and extends vertically through a base member 31 and a cylindrical squeegee shaft guide portion 31b provided on the upper surface of the base member 31 to guide the squeegee shaft. A bearing 31c (see an enlarged view shown in FIG. 5) provided in the portion 31b is rotatably held around the vertical axis.

  4 and 5, the squeegee shaft vertical movement mechanism 32 includes a cylindrical nut member 61 provided above the squeegee shaft guide portion 31 b and extending by being screwed through the squeegee shaft 33 in the vertical direction. A ring-shaped driven pulley 62 that is fixed to the upper portion of the member 61 and extends through the squeegee shaft 33 (freely fitted), and two squeegee shaft guide portions 31b are sandwiched between the upper surface of the base member 31 in the X-axis direction. Two squeegee shaft drive motors 63 provided at the positions with the drive shaft 63a facing upward, two drive pulleys 64 attached to the drive shaft 63a of each squeegee shaft drive motor 63, and two drive pulleys Two transmissions spanned between one of the two driven pulleys 62 and one of the two driven pulleys 62 and between the other of the two driving pulleys 64 and the other of the two driven pulleys 62. Consisting of a belt 65.

  When the drive pulley 64 is rotated by the rotational drive of the drive shaft 63a of the squeegee shaft drive motor 63, the driven pulley 62 rotates about its vertical axis (this axis coincides with the vertical axis of the squeegee shaft 33) via the transmission belt 65. As the nut member 61 rotates together with the driven pulley 62, the squeegee shaft 33 moves up and down with respect to the nut member 61 (that is, with respect to the base member 31). As a result, the squeegee holder 41 attached to the lower end of the squeegee shaft 33 is lifted and lowered while being guided by the pair of guide rods 51 and extending in the X-axis direction, and accordingly, the squeegee 42 attached to the squeegee holder 41. However, it moves up and down with respect to the base member 31 while maintaining the posture extending in the X-axis direction. Since the relative position of the mask 13 and the base member 31 in the vertical direction does not change, the squeegee 42 can be brought into contact with the mask 13 from above by lowering each squeegee shaft 33 with respect to the base member 31.

  As described above, the lower end of the squeegee shaft 33 is attached to the upper surface of the squeegee holder 41. However, as shown in FIGS. An elastic body 66 is interposed, and a load measuring device 67 (load measuring means) composed of a strain gauge type load cell is attached to the elastic body 66. When a vertical axial load (compression load or tensile load) is applied to the squeegee shaft 33 via the squeegee 42, the load measuring device 67 receives a squeegee shaft from the distortion of the elastic body 66 that is elastically deformed under the load. Measure (detect) 33 axial loads.

  As shown in FIGS. 4 and 5, each squeegee shaft drive motor 63 has a squeegee shaft when the squeegee shaft 33 is moved downward from the rotational speed (rotational position) of the drive shaft 63 a of the squeegee shaft drive motor 63. A descending amount detector 68 (descending amount detecting means) comprising an encoder for detecting the descending amount of 33 relative to the base member 31 is provided (see also FIG. 1).

  1 and 2, the camera unit 15 includes a lower imaging camera 15a whose imaging field is directed downward and an upper imaging camera 15b whose imaging field is directed upward. The camera unit 15 is moved in a horizontal plane in a region between the substrate holding unit 11 and the mask 13 by a camera unit moving mechanism 15M including an actuator (not shown).

  The substrate holding unit 11 conveys the substrate 2 by the conveyer 22 and positions the substrate 2 at the work position, performs the receiving operation by the lower receiving portion 24 and the clamping operation by the pair of clamp members 25 with respect to the substrate 2 positioned at the working position. Is performed by controlling the operation of a substrate holding mechanism 71 (FIG. 1) including an actuator including the above-described under-lifting cylinder 23, and moving the substrate holding unit 11 holding the substrate 2 in the horizontal plane and in the vertical direction. The operation is performed when the control device 17 controls the operation of the unit moving mechanism 11M.

  In FIG. 1, the reciprocating movement of the squeegee head 14 (base member 31) in the Y-axis direction is performed by the control device 17 controlling the operation of the base member moving mechanism 14M. The raising / lowering operation of the unit 34 with respect to the base member 31 is performed when the control device 17 controls the operation of the two squeegee shaft drive motors 63.

  In FIG. 1, the movement operation of the camera unit 15 in the horizontal plane is performed by the control device 17 performing the operation control of the camera unit movement mechanism 15M. Control of the imaging operation by the lower imaging camera 15a and control of the imaging operation by the upper imaging camera 15b are respectively performed by the control device 17, and obtained by the image data obtained by the imaging operation of the lower imaging camera 15a and the imaging operation of the upper imaging camera 15b. The obtained image data is transmitted to the control device 17 and subjected to image recognition processing in the image recognition unit 17a of the control device 17.

  In FIG. 1, the values of the axial loads of the two squeegee shafts 33 measured by the load measuring devices 67 are also input to the control device 17 and detected by the descending amount detectors 68 with respect to the base member 31 of the squeegee shaft 33. The value of the descending amount is also input to the control device 17.

  Next, in addition to the flowcharts of FIGS. 6 and 7 and the explanatory diagrams of FIGS. 8 to 13, the operation procedure of the screen printing machine 1 (screen printing work on the substrate 2 and tension of the mask 13 performed before the screen printing work) (Measurement work) will be described. Here, FIG. 6 is a flowchart of the main routine of the operation of the screen printing machine 1 and shows the procedure of the screen printing work. FIG. 7 is a flowchart of the subroutine in the main routine, and the work of measuring the tension of the mask 13 ( The procedure of the method of measuring the tension of the mask 13 is shown.

  The control device 17 of the screen printing machine 1 performs the work of measuring the tension of the mask 13 before executing the screen printing work on the substrate 2 (step ST1 shown in FIG. 6 → the subroutine shown in FIG. 7). In the measurement of the tension of the mask 13, the descending amount acquisition operation control unit 17b (FIG. 1) of the control device 17 first moves the substrate holding unit 11 in a state where the substrate 2 is not held by the pair of clamp members 25 to the unit moving mechanism 11M. The upper surface of the pair of clamp members 25 is brought into contact with the lower surface of the mask 13 from below (step ST21 shown in FIG. 7).

  When the upper surface of the pair of clamp members 25 is brought into contact with the lower surface of the mask 13, the descending amount acquisition operation control unit 17b of the control device 17 controls the operation of the base member moving mechanism 14M so that one squeegee 42 is one clamp member. The squeegee shaft drive motor 63 corresponding to the squeegee shaft 33 to which the squeegee 42 is attached is controlled so as to move the squeegee shaft 33 downwardly (see FIG. 8A). 8 (arrow A1 shown in FIG. 8A), and the lower edge of the squeegee 42 is brought into contact with the mask 13 on the one clamp member 25 located immediately below the squeegee 42 (FIG. 8B). Step ST22 shown in FIG. ).

  When the lower edge acquisition operation control unit 17b of the control device 17 makes the lower edge of the squeegee 42 contact the mask 13 on the one clamp member 25, the load of the squeegee shaft 33 to which the squeegee 42 is attached is measured. The squeegee shaft drive motor 63 is operated to lower the squeegee shaft 33 until the output from the load measuring device 67 (axial load of the squeegee shaft 33) reaches a predetermined value P (FIG. 10) (FIG. 8). (C) arrow A2), the amount of descent of the squeegee shaft 33 at that time (when the output from the load measuring device 67 reaches a predetermined value P) is read from the output of the descent amount detector 68 and read. It memorize | stores in the memory | storage part 17c (FIG. 1) as 1st fall amount S1 (FIG. 10). That is, the descending amount acquisition operation control unit 17b of the control device 17 moves the squeegee shaft 33 downward until the axial load of the squeegee shaft 33 reaches a predetermined value P, and determines the descending amount of the squeegee shaft 33 at that time. 1 as a descending amount S1 (step ST23 shown in FIG. 7).

  As described above, in the present embodiment, step ST23 is performed by the load measuring device 67 after the squeegee 42 is brought into contact with the mask 13 on the one clamp member 25 in a state where the pair of clamp members 25 are in contact with the mask 13. The squeegee shaft 33 is moved downward until the axial load of the squeegee shaft 33 to be measured reaches a predetermined value P. At this time, the descending amount of the squeegee shaft 33 detected by the descending amount detector 68 is set as the first descending amount S1. It is a process to acquire as.

  When the descending amount acquisition operation control unit 17b of the control device 17 acquires the first descending amount S1, the descending amount acquiring operation control unit 17b moves the squeegee shaft 33 moved downward (step ST24 shown in FIG. 7). Then, the unit moving mechanism 11M is operated to separate the upper surfaces of the pair of clamp members 25 from the lower surface of the mask 13 (step ST25 shown in FIG. 7).

  When the pair of clamp members 25 are separated from the mask 13, the descending amount acquisition operation control unit 17 b of the control device 17 is in a state where the pair of clamp members 25 are not in contact with the mask 13 and the first descending amount is as described above. After the squeegee head 14 is moved so that the squeegee 42 at the time of acquiring S1 is positioned almost directly above the center of the mask 13 (FIG. 9A), the squeegee shaft 33 to which the squeegee 42 is attached is moved. The operation of the corresponding squeegee shaft drive motor 63 is controlled to move the squeegee shaft 33 downward (arrow B1 shown in FIG. 9A), and the lower edge of the squeegee 42 is brought into contact with the central portion of the mask 13 (FIG. 9). (B) Step ST26 shown in FIG.

  When the lower edge acquisition operation control unit 17b of the control device 17 makes the lower edge of the squeegee 42 contact the center of the mask 13, the load measuring device 67 measures the axial load of the squeegee shaft 33 to which the squeegee 42 is attached. The squeegee shaft drive motor 63 is operated to lower the squeegee shaft 33 until the output (the axial load of the squeegee shaft 33) reaches the same predetermined value P as in step ST23 (FIG. 9C). The arrow B2 shown in the figure), the amount of descent of the squeegee shaft 33 at that time (when the output from the load measuring device 67 reaches a predetermined value P) is read from the output of the descent amount detector 68 and this is read as a second value. It memorize | stores in the memory | storage part 17c as descent | fall amount S2 (FIG. 10). That is, the squeegee shaft 33 is moved downward until the axial load of the squeegee shaft 33 reaches a predetermined value P, and the descending amount of the squeegee shaft 33 at that time is acquired as the second descending amount S2 (shown in FIG. 7). Step ST27).

  Thus, in the present embodiment, step ST27 is the axial direction of the squeegee shaft 33 measured by the load measuring device 67 after the squeegee 42 is brought into contact with the portions of the mask 13 that are not in contact with the pair of clamp members 25. The squeegee shaft 33 is moved downward until the load reaches a predetermined value P, and the descending amount of the squeegee shaft 33 detected by the descending amount detector 68 at that time is acquired as the second descending amount S2.

  The axial load acting on the squeegee shaft 33 when acquiring the first descending amount S1 is the same as the axial load acting on the squeegee shaft 33 when acquiring the second descending amount S2. When acquiring the descending amount S2 of 2, the mask 13 is pushed by the squeegee 42 and bends downward, so that the second descending amount S2 is larger than the first descending amount S1. When the descending amount acquisition operation control unit 17b of the control device 17 acquires the second descending amount S2, the descending amount acquisition operation control unit 17b moves the squeegee shaft 33 moved downward (step ST28 shown in FIG. 7).

  When the descending amount acquisition operation control unit 17b of the control device 17 acquires the second descending amount S2 and then moves the squeegee shaft 33 moved downward, the tension calculating unit 17d of the control device 17 (FIG. 1). Are the first descent amount S1 acquired by the descent amount acquisition operation control unit 17b in step ST23 and stored in the storage unit 17c, and the descent amount acquisition operation control unit 17b is acquired in step ST27 and stored in the storage unit 17c. The tension of the mask 13 is calculated from the difference from the second lowered amount S2 that has been made (step ST29 shown in FIG. 7). As a result, the tension value T of the mask 13 is obtained by the downward deflection amount T = S2-S1 (FIG. 10).

  As described above, in the present embodiment, step ST28 is a step of calculating the tension of the mask 13 from the difference between the acquired first descending amount S1 and the second descending amount S2.

  The storage unit 17c of the control device 17 stores the upper limit value (T0) of the normal range of the tension of the mask 13, and the control device 17 masks the tension value T of the mask 13 calculated in step ST29. 13 is compared with the upper limit value T0 of the normal range of tension 13 to determine whether or not the calculated tension of the mask 13 is normal (step ST30 shown in FIG. 7). In this determination, if the calculated tension of the mask 13 is equal to or less than the upper limit value T0 of the normal range, it is determined to be normal, and if the calculated tension value T of the mask 13 exceeds the upper limit value T0, it is determined to be abnormal.

  When determining that the tension of the mask 13 is normal, the control device 17 notifies the display device 16 that the tension of the mask 13 is normal (step ST31 shown in FIG. 7). Return to the main routine.

  On the other hand, when the control device 17 determines that the tension of the mask 13 is abnormal, it notifies the display device 16 that the tension of the mask 13 is abnormal (step shown in FIG. 7). ST32), a standby state is entered (step ST33 shown in FIG. 7). Then, the control device 17 operates the operation signal of the operation resuming button 69 (FIG. 1) operated by the operator who has received notification that the tension of the mask 13 is abnormal in the display device 16 after replacing the mask 13. Based on the output, the determination as to whether or not the operator has operated the operation resuming button 69 is repeatedly executed at regular intervals (step ST34 shown in FIG. 7). As a result, when it is determined that the operator has operated the operation resuming button 69, the control device 17 returns to step ST21 and re-measures the tension of the mask 13.

  Accordingly, it is possible to prevent the defective substrate from being produced by performing the screen printing operation while the tension of the mask 13 is in an abnormal state (the amount of downward deflection is large).

  As described above, in this embodiment, the descending amount acquisition operation control unit 17b of the control device 17 moves the squeegee 42 to the mask 13 on one clamp member 25 in a state where the pair of clamp members 25 are in contact with the mask 13. After the contact, the squeegee shaft 33 detected by the descending amount detector 68 when the squeegee shaft 33 is moved downward until the axial load of the squeegee shaft 33 measured by the load measuring device 67 reaches a predetermined value P. Of the squeegee shaft 33 measured by the load measuring device 67 after the squeegee 42 is brought into contact with portions of the mask 13 that are not in contact with the pair of clamp members 25. The lowering amount of the squeegee shaft 33 detected by the lowering amount detector 68 when the squeegee shaft 33 is moved downward until the directional load becomes the same predetermined value P is the second lowering amount. It has a lowered amount acquisition means for acquiring a 2.

  Further, the tension calculating unit 17d of the control device 17 determines the tension of the mask 13 from the difference between the first descending amount S1 and the second descending amount S2 acquired by the descending amount acquiring operation control unit 17b as the descending amount acquiring unit. It is a tension calculating means for calculating.

  When the measurement of the tension of the mask 13 (step ST1) by the descending amount acquisition operation control unit 17b and the tension calculation unit 17d of the control device 17 is completed as described above, the transfer operation control unit 17e (FIG. 1) of the control device 17 is completed. Detects that the substrate 2 has been sent from another device or the like (not shown) installed on the upstream side of the screen printing machine 1, operates the conveyor 22 of the substrate holding unit 11 to activate the screen printing machine. The board | substrate 2 is carried in in 1 (step ST2 shown in FIG. 6).

  After carrying in the substrate 2, the transfer operation control unit 17e of the control device 17 controls the operation of the substrate holding mechanism 71 to hold the substrate 2 (step ST3 shown in FIG. 6). Specifically, the holding of the substrate 2 is performed by pushing up the lower receiving portion 24 by the lower receiving portion lifting cylinder 23 to lift the substrate 2 from the conveyor 22 (arrow C1 shown in FIG. 11A), This is done by driving the pair of clamp members 25 in the closing direction and sandwiching both ends of the substrate 2 (arrow D1 shown in FIG. 11A) (FIG. 11A).

  When the transfer operation control unit 17e of the control device 17 holds the substrate 2, it controls the operation of the camera unit moving mechanism 15M, positions the lower imaging camera 15a directly above the substrate side mark 2m provided on the substrate 2, and moves downward. The imaging camera 15a captures the substrate-side mark 2m, while the upper imaging camera 15b is positioned immediately below the mask-side mark 13m provided on the mask 13 to cause the upper imaging camera 15b to capture the mask-side mark 13m. . Then, the transfer operation control unit 17e of the control device 17 grasps the position of the substrate 2 from the obtained image data of the substrate side mark 2m, and grasps the position of the mask 13 from the obtained image data of the mask side mark 13m. Then, the substrate holding unit 11 is moved in the horizontal plane direction so that the substrate side mark 2m and the mask side mark 13m face each other in the vertical direction so that the alignment of the substrate 2 with respect to the mask 13 in the horizontal plane direction is performed (FIG. 6). Step ST4 shown).

  When the positioning of the substrate 2 with respect to the mask 13 is finished, the transfer operation control unit 17e of the control device 17 controls the operation of the unit moving mechanism 11M to raise the substrate holding unit 11 with respect to the base 10 (FIG. 11 ( b) Arrow E1 shown in the figure, the pair of clamp members 25 holding the substrate 2 are pressed against the lower surface of the mask 13 from below, so that the upper surfaces of the pair of clamp members 25 and the substrate 2 respectively. Is brought into contact with the lower surface of the mask 13 (FIG. 11B) (step ST5 shown in FIG. 6). As a result, the electrode 3 on the substrate 2 and the opening 13h of the mask 13 are brought into alignment.

  When the upper surfaces of the pair of clamp members 25 and the substrate 2 are in contact with the lower surface of the mask 13 as described above, a horizontal plane perpendicular to the conveyance direction (X-axis direction) of the substrate 2 by the conveyor 22 is placed on the mask 13. In the inward direction (Y-axis direction), a region in contact with the substrate 2 (mask region R1 on the substrate 2) and two regions in contact with each clamp member 25 (mask region R2 on the clamp member 25) are formed. The

  When the transfer operation control unit 17e of the control device 17 brings the substrate 2 into contact with the mask 13, the display device 16 displays a message prompting the operator to supply the paste Pt (step ST6 shown in FIG. 6). On the other hand, the operator visually checks the paste Pt remaining on the mask 13 and determines whether or not to supply (supplement) the paste Pt based on the amount of the paste Pt. When it is determined that the paste Pt should be supplied, the paste Pt is supplied onto the mask 13 by using a separately prepared paste supply syringe 80 (FIG. 12A). When the supply of the paste Pt is finished, the operation restart button 69 described above is operated. The operator operates the operation resuming button 69 even when it is determined that the supply of the paste Pt is unnecessary.

  In step ST6, the transfer operation control unit 17e of the control device 17 displays a message prompting the supply of the paste Pt on the display device 16, and then determines whether or not the operation restart button 69 has been operated at regular intervals. (Step ST7 shown in FIG. 6) Based on the signal output from the operation restart button 69, when it is detected that the operation restart button 69 has been operated by the operator, the squeegee head 14 is moved to one of the pair of clamp members 25. The upper surface of the mask 13 in which one of the two squeegees 42 is lowered and the lower edge of the squeegee 42 is in contact with the clamp member 25 (mask region R2 on the clamp member 25) is positioned above. (Step ST8 shown in FIG. 6).

  The squeegee 42 that is lowered (abuts against the mask 13) at this time is the front squeegee 42 when the squeegee head 14 is positioned above the front clamp member 25, and the squeegee head 14 is moved to the rear clamp member. When it is positioned above 25, it is the rear squeegee 42.

  When the squeegee 42 is brought into contact with the upper surface of the mask region R2 on the clamp member 25 by the downward movement of the squeegee shaft 33, the transfer operation control unit 17e of the control device 17 operates the base member moving mechanism 14M to move the squeegee 42. The base member 31 (that is, the squeegee 42) is moved in the horizontal direction (Y-axis direction) with respect to the mask 13 while being in contact with the upper surface of the mask 13 (arrow F shown in FIG. 12B). Then, the paste Pt supplied onto the mask 13 is scraped by the squeegee 42 and pushed into the opening 13h of the mask 13 to transfer the paste Pt to the electrode 3 (step ST9 shown in FIG. 6).

  As described above, the transfer operation control unit 17 e of the control device 17 moves the base member 31 in the horizontal direction with respect to the mask 13 in a state where the squeegee 42 is in contact with the upper surface of the mask 13 by the downward movement of the squeegee shaft 33. As a result, the paste Pt supplied on the mask 13 is transferred by the squeegee 42 and transferred to the substrate 2.

  In step ST9, the transfer operation control unit 17e of the control device 17 moves the squeegee 42 from the mask region R2 on one clamp member 25 through the mask region R1 on the substrate 2 to the mask region on the other clamp member 25. Move to R2. Specifically, the front squeegee 42 is moved from the mask region R2 on the front clamp member 25 to the mask region R2 on the rear clamp member 25, and the rear squeegee 42 is moved to the rear clamp. The mask region R2 on the member 25 is moved to the mask region R2 on the front clamp member 25.

  When the transfer operation control unit 17e of the control device 17 detects that the squeegee 42 has reached the mask region R2 on the other clamp member 25 from the mask region R1 on the one clamp member 25, the transfer of the paste Pt is completed. After the movement of the base member 31 is stopped, the squeegee shaft 33 of the squeegee 42 that is in contact with the mask 13 is moved upward with respect to the base member 31 to separate the squeegee 42 from the mask 13 (shown in FIG. 6). Step ST10).

  When the squeegee 42 is separated from the mask 13, the transfer operation control unit 17e of the control device 17 operates the unit moving mechanism 11M to lower the substrate holding unit 11 (arrow E2 shown in FIG. 13A), and the mask. The substrate 2 and the pair of clamp members 25 are separated from the plate 13 to release the plate (FIG. 13A) (step ST11 shown in FIG. 6).

  When the plate separation is completed, the transfer operation control unit 17e of the control device 17 operates the substrate holding mechanism 71 to open the pair of clamp members 25 (arrow D2 shown in FIG. 13B), and The receiving part 24 is lowered (arrow C2 shown in FIG. 13B), and both ends of the substrate 2 are lowered onto the pair of conveyors 22 (FIG. 13B). Thereby, the holding of the substrate 2 by the substrate holding unit 11 is released (step ST12 shown in FIG. 6).

  When the transfer operation control unit 17e of the control device 17 releases the holding of the substrate 2, the unit moving mechanism 11M is operated to move the substrate holding unit 11 in the horizontal plane, and the direction of the conveyor 22 is adjusted. Is operated to carry the substrate 2 out of the screen printer 1 (step ST13 shown in FIG. 6).

  When the transfer operation control unit 17e of the control device 17 carries out the substrate 2, it determines whether there is another substrate 2 on which screen printing is to be performed (step ST14 shown in FIG. 6). As a result, if there is another substrate 2 to be screen-printed, the process returns to step ST2 to carry in a new substrate 2, and if there is no other substrate 2 to be screen-printed, a series of screen printing operations. Exit.

  Thus, according to the screen printing machine 1 (the tension measuring method for the mask 13 of the screen printing machine 1) in the present embodiment, the tension of the entire mask 13 can be measured, but the pair of clamp members 25 are masked. After the squeegee 42 is brought into contact with the portion of the mask 13 (mask region R1 on the substrate 2) that is not in contact with the pair of clamp members 25, the squeegee shaft is measured by the load measuring device 67. The descending amount of the squeegee shaft 33 detected by the descending amount detector 68 when the squeegee shaft 33 is moved downward until the axial load of 33 reaches a predetermined value P is acquired as the second descending amount S2. By doing so, the local tension of the portion of the metal plate 13b can be measured. Specifically, in step ST25 of the subroutine for measuring the tension of the mask 13 (FIG. 7), the pair of clamp members 25 are not separated from the mask 13 (without executing step ST25) and subsequent steps ST26. This can be realized by executing the process.

  As described above, in the screen printing machine 1 according to the present embodiment, the squeegee 42 is brought into contact with the mask 13 on the one clamp member 25 in a state in which the pair of clamp members 25 are in contact with the mask 13, and then the squeegee. A descending amount (first descending amount S1) of the squeegee shaft 33 detected when the squeegee shaft 33 is moved downward until the axial load of the shaft 33 reaches a predetermined value P, and a pair of clamp members of the mask 13 The squeegee shaft 33 is lowered when the squeegee shaft 33 is moved downward until the axial load of the squeegee shaft 33 reaches the same predetermined value P after the squeegee 42 is brought into contact with a portion not in contact with the squeegee 25. The amount (second descending amount S2) is obtained, and the tension of the mask 13 (the tension of the entire mask 13 or the local portion of the metal plate 13b is determined from the difference between these descending amounts S1 and S2. Pensions) adapted to calculate a, between the tension measurement of the mask 13, it is not necessary to remove the mask 13 from the screen printing machine 1, it is possible to determine the tension of the mask 13 conveniently and quickly.

  Provided are a screen printing machine and a mask tension measuring method for a screen printing machine, in which a mask tension can be obtained easily and quickly.

DESCRIPTION OF SYMBOLS 1 Screen printer 2 Board | substrate 13 Mask 17b Falling amount acquisition operation control part (falling amount acquisition means)
17d Tension calculation unit (tension calculation means)
17e Transfer operation control unit (transfer operation control means)
25 Clamp member 31 Base member 33 Squeegee shaft 42 Squeegee 66 Elastic body 67 Load measuring device (load measuring means)
68 Descent amount detector (Descent amount detection means)
Pt paste

Claims (3)

A pair of clamp members for holding both sides of the substrate;
A pair of clamp members holding the substrate are relatively pressed from below so that the mask contacts the upper surfaces of the pair of clamp members and the substrate, and
A base member that is moved horizontally relative to the mask;
A squeegee shaft that extends downward from the base member and is vertically movable with respect to the base member;
A squeegee attached to the lower end of the squeegee shaft;
By moving the base member horizontally with respect to the mask while the squeegee is in contact with the upper surface of the mask by the downward movement of the squeegee shaft, the paste supplied on the mask is scraped by the squeegee and transferred to the substrate. A transfer operation control means;
A descent amount detecting means for detecting a descent amount of the squeegee shaft when the squeegee shaft is moved down;
Load measuring means for measuring the axial load of the squeegee shaft;
After the squeegee is brought into contact with the mask on one clamp member while the pair of clamp members are in contact with the mask, the squeegee shaft is moved until the axial load of the squeegee shaft measured by the load measuring means reaches a predetermined value. The lowering amount of the squeegee shaft detected by the lowering amount detecting means when it is moved downward is acquired as the first lowering amount, and then the upper surfaces of the pair of clamp members are separated from the lower surface of the mask, or the pair of clamp members After the squeegee is brought into contact with a portion of the mask that is not in contact with the pair of clamp members without being separated from the mask, the squeegee is loaded until the axial load of the squeegee shaft measured by the load measuring means reaches the predetermined value. Descent amount acquisition means for acquiring the descent amount of the squeegee shaft detected by the descent amount detection means when the shaft is moved down as a second descent amount;
A screen printing machine comprising: a tension calculating unit that calculates a mask tension from a difference between the first descending amount and the second descending amount acquired by the descending amount acquiring unit.   2. The screen printing machine according to claim 1, wherein the load measuring means comprises a load cell attached to an elastic body interposed between the squeegee shaft and the squeegee. A pair of clamp members that hold both sides of the substrate and a pair of clamp members that hold the substrate relatively pressed from below so that the pair of clamp members and the mask that contacts the upper surfaces of the substrate, A base member that is moved in a horizontal direction with respect to the mask, a squeegee shaft that extends downward from the base member and is movable up and down relative to the base member, a squeegee attached to a lower end of the squeegee shaft, and a squeegee shaft Transfer operation to scrape the paste supplied on the mask with the squeegee and transfer it to the substrate by moving the base member horizontally with respect to the mask with the squeegee in contact with the upper surface of the mask Control means, descent amount detecting means for detecting the descent amount of the squeegee axis when the squeegee axis is moved down, and measuring the axial load of the squeegee axis. A tension measuring method for a mask of a screen printing machine comprising a load measuring means for,
After the squeegee is brought into contact with the mask on one clamp member while the pair of clamp members are in contact with the mask, the squeegee shaft is moved until the axial load of the squeegee shaft measured by the load measuring means reaches a predetermined value. Obtaining a first descending amount, a descending amount of the squeegee shaft detected by the descending amount detecting means at that time;
After obtaining the first descending amount, the upper surfaces of the pair of clamp members are separated from the lower surface of the mask, and the pair of clamp members are not separated from the mask and are not in contact with the pair of clamp members of the mask. After the squeegee is brought into contact, the squeegee shaft is moved downward until the axial load of the squeegee shaft measured by the load measuring means reaches the predetermined value. Obtaining the second descending amount;
A mask tension measuring method for a screen printing machine, comprising: calculating a mask tension from a difference between the acquired first descending amount and the second descending amount.

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