JP4567517B2 - Printing device - Google Patents

Description

This invention also relates to paste such as cream solder printing equipment which is adapted to print on the substrate.

  Conventionally, a stencil (mask) for screen printing is placed on a substrate set on a printing stage, and paste (such as cream solder) supplied on the stencil is expanded with a squeegee to form openings (pattern holes) on the stencil. A screen printing apparatus that prints (applies) a paste to a predetermined position of a substrate via a) is well known.

  Many of such printing apparatuses include an elevating mechanism for elevating the substrate relative to the stencil.

  For example, in the printing apparatus shown in Patent Document 1, two-stage lifting / lowering is performed by a first lifting / lowering unit that lifts and lowers a placement unit on which a substrate is placed, and a second lifting / lowering unit that raises and lowers a base unit that supports the placement unit. The mechanism has a mechanism and corresponds to the thickness of the substrate by adjusting the lifting / lowering stroke of the first lifting / lowering means, while the second lifting / lowering means integrally raises and lowers the mounting portion and the base portion to stencil the substrate. It is designed to be raised to a printing height close to.

And these two raising / lowering means are equipped with the ball screw arrange | positioned in four places, both a mounting part and a base part, and raise / lower drive a mounting part and a base part by rotating these interlockingly by winding of a timing belt. It is configured as follows.
Japanese Patent No. 3323450 (paragraphs 0011 to 0014)

  However, according to such an elevating mechanism that wraps the timing belt, if the positions of the ball screws are not sufficiently aligned, the heights of the ball screws arranged at the four positions are not matched, and the substrate is tilted to hold the elevating operation. End up.

  Further, even if a thrust bearing necessary for the support portion of each ball screw is worn, the substrate is tilted during the lifting operation.

  Even if the inclination of the substrate by the individual elevating means is slight, the inclination of the substrate is increased by stacking the elevating means in two stages in series, and the substrate does not follow the stencil correctly, and the print quality is liable to deteriorate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a printing apparatus capable of realizing high print quality by suppressing the inclination of the substrate.

  The present invention provides the following means.

[1] A printing apparatus for applying a paste to a substrate supported by a supporting means,
The support means includes a first support means capable of supporting the substrate, a second support means for supporting the first support means, and a first support means for moving the first support means up and down relative to the second support means. 1 elevating means, and second elevating means for elevating the second support means relative to the apparatus main body,
At least one of the first and second elevating means includes at least diagonal positions of the elevating drive means for applying elevating driving force to the central portion of the first or second support means, and the first or second support means And an operation direction restricting means for restricting the operation direction .
The elevating driving means for elevating and driving the first supporting means with respect to the second supporting means includes two rack and pinion mechanisms,
The rack and pinion mechanism is disposed at two locations in the center with respect to the longitudinal direction of the first support means,
One rack and pinion mechanism is driven by a motor, and the rotational driving force of this one rack and pinion mechanism is transmitted to the other rack and pinion mechanism via a power transmission shaft,
At least one of the first and second lifting means includes a parallel link mechanism,
The parallel link mechanism is provided between the first support means and the second support means,
The parallel link mechanism includes four link arms that are respectively arranged at four positions slightly inside near the four corner positions of the first support means and bend in a dogleg shape.
The link arm is arranged in a line-symmetric position about a line connecting the two rack and pinion mechanisms,
Each of the four link arms is a pair, and the upper end portion and the lower end portion thereof are rotatably attached to the first support means and the second support means, and the bent portions of all the link arms. but printing apparatus characterized that you have been connected by a connecting plate.

  [2] The printing apparatus according to [1], wherein the operation direction restricting means is disposed in the vicinity of the four corner positions of the first or second support means.

According to the printing apparatus according to the invention [1], since the elevating drive means is disposed at the center of the support means, it is possible to prevent the elevating drive force from being transmitted unbalanced to each part of the support means. In addition, since the inclination of the support means is prevented by the operation direction restricting means arranged at least in the diagonal position, it is possible to realize high print quality by suppressing the inclination of the substrate. Further, since the elevating drive means includes a rack and pinion mechanism, the rotational motion of a rotational drive source such as a motor can be converted into linear motion with high efficiency, and power loss can be suppressed to a low level. Furthermore, since the parallel link mechanism is provided, the horizontal state of the support means can be more reliably ensured, the tilt of the substrate can be prevented, and high print quality can be realized.

  According to the printing apparatus according to the invention [2], since the operation direction restricting means is disposed in the vicinity of the four corner positions of the support means, the tilt of the support means can be prevented more reliably.

  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 apparatus, FIG. 3 is a plan view of the apparatus, and FIG. 4 is a main part (printing stage 10) of the apparatus. It is a perspective view. As shown in these drawings, a printing stage 10 is provided on the base 2 of the screen printing apparatus, and a printed circuit board W is carried into and out of the printing stage 10 on both sides of the printing stage 10. Upstream conveyor 11 and downstream conveyor 12 are arranged along the X-axis direction (conveyance line).

  Further, this printing apparatus is provided above the printing stage 10, a clamping unit 3 for clamping the printed board W, a positioning unit 4 for engaging and positioning the board W on the upper surface side of the board, and the printing stage 10. The substrate W clamped by the clamp unit 3 is placed on the stencil 51 of the stencil holding unit 5 as described later, and in this state, the squeegee 61 of the squeegee unit 6 Screen printing is performed.

  As shown in FIGS. 1 and 2, a rail 211 is disposed on the base 2 along the Y-axis direction orthogonal to the X-axis direction in the horizontal plane, and the Y-axis table 21 is mounted on the rail 211. It is slidably attached in the Y-axis direction. Further, a ball screw mechanism (not shown) is provided between the Y-axis table 21 and the base 2, and the Y-axis table 21 moves in the Y-axis direction with respect to the base 2 by driving the ball screw mechanism. It is configured as follows.

  A rail 221 is disposed on the Y-axis table 21 along the X-axis direction, and the X-axis table 22 is slidably attached to the rail 221 in the X-axis direction. Further, a ball screw mechanism (not shown) is provided between the X-axis table 22 and the Y-axis table 21, and the X-axis table 22 moves in the X-axis direction with respect to the Y-axis table 21 by driving the ball screw mechanism. It is configured to move.

  The X-axis table 22 is provided with an R-axis table 23 via a rotation unit 231 so as to be rotatable around an axis line in the vertical line (Z-axis direction). The R-axis table 23 is configured to be rotationally driven around the Z axis by a rotational driving means (not shown).

  Slide struts 241 are attached to the four corners of the R-axis table 23 so as to be slidable in the vertical direction (Z-axis direction), and an elevating table 24 is attached to the upper part of the slide strut 241. A lifting table 24 is attached to the R-axis table 23 so as to be movable up and down in the Z-axis direction. Further, a ball screw mechanism 243 is provided between the lift table 24 and the R-axis table 23, and the lift table 24 is driven in the Z-axis direction (vertical direction) with respect to the R-axis table 23 by driving the ball screw mechanism 243. It is configured to move. The lifting table 24 constitutes second support means, and the ball screw mechanism 243 constitutes second lifting means.

  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 lifting table 24 is lowered. . In this opposed state, the gap between the main conveyor 20 and the two-side conveyors 11 and 12 is set to an interval at which the substrate W can be connected between the conveyors, and specifically, set to a small value of about 5 mm. Therefore, in this embodiment, the main conveyor 20 moves in the X-axis and R-axis directions by the movement of the X-axis and R-axis tables 22 and 23 in the lowered state in order to avoid interference with the both-side conveyors 11 and 12. In addition, the movement in the Y-axis and R-axis directions due to the movement of the Y-axis and R-axis tables 21 and 23 is restricted in order to prevent positional deviation with respect to the both-side conveyors 11 and 12. That is, in the lowered state, the main conveyor 20 is restricted from moving in the horizontal direction (X-axis, Y-axis, and R-axis directions) due to the movement of the X-axis, Y-axis, and R-axis tables 21 to 23.

  As shown in FIGS. 1 to 5, the clamp unit 3 provided on the lifting table 24 includes a pair of strip-shaped clamp pieces 31 a and 31 b disposed along the X-axis direction above the pair of main conveyors 20. is doing. The one side clamp piece 31a is fixed on the structural material 25 (see FIG. 5) of the lifting table 24, and the other side clamp piece 31b is slidable in the Y-axis direction with respect to the structural material 25 of the lifting table 24. It is attached and is configured to be able to contact and separate from the one side clamp piece 31a.

  Furthermore, a bracket 26 b is provided on the other side clamp 31 b, and an air cylinder 33 is provided between the bracket 26 b and the structural material 25. When the cylinder 33 is driven forward (extension drive), the other side clamp piece 31b moves in the direction away from the one side clamp piece 31a along the Y-axis direction, and the clamp pieces 31a and 31b are opened. When the cylinder 33 is driven backward (shortening drive), the other side clamp 31b moves in the direction approaching the one side clamp piece 31a along the Y-axis direction, and the clamp pieces 31a and 31b are closed. . As described later, the substrate W is held / released by opening and closing the pair of clamp pieces 31a and 31b.

  As shown in FIGS. 3 and 4, a plurality of suction holes 35 are provided on the upper surfaces of the clamp pieces 31a and 31b. Each suction hole 35 is configured to be set to a negative pressure by suction means (not shown). When the stencil 51 is overlaid on the clamp pieces 31a and 31b, each suction hole 35 is set to a negative pressure, so that the stencil 51 is sucked and held on the upper surfaces of the clamp pieces 31a and 31b. ing.

  As shown in FIG. 5, the positioning unit 4 as the pressing means provided on the lifting table 24 includes a pair of belt-like positioning plates 41a and 41b arranged corresponding to the clamp pieces 31a and 31b, respectively. Yes. The one side positioning plate 41a is provided on the structural member 25 via the parallel link mechanism 42, and the other side positioning plate 41b is provided on the bracket 26b via the parallel link mechanism 42. With the rotation of the parallel link mechanisms 42, 42, the positioning plates 41a, 41b are arranged on both sides of the pair of clamp pieces 31a, 31b as shown in FIG. As shown in FIG. 6 (b), the retraction position is configured to be freely displaceable between the pair of clamp pieces 31a and 31b. Further, the upper surfaces of the positioning plates 41a and 41b are arranged in the same horizontal plane with respect to the upper surfaces of the pair of clamp pieces 31a and 31b in the retracted position, and a part of the lower end surface is a pair of clamp pieces in the positioning position. It arrange | positions so that it may protrude in the Y-axis direction rather than 31a and 31b.

  The lifting table 24 and the bracket 26b are provided with a cylinder 43 for driving the parallel link mechanisms 42. When the cylinder 43 is driven forward (extension drive), the pair of positioning plates 41a and 41b are located inside. The pair of positioning plates 41a and 41b is opened and moved to the retracted position by moving forward to the positioning position and moving to the positioning position and by performing backward driving (shortening driving).

  As shown in FIG. 4, pillars 44 as support members for supporting the positioning plate are erected at the four corners of the lifting table 24. In the state where the positioning plate 41a is disposed at the retracted position (retracted state), the positioning plates 41a and 41b are supported by the support poles 44 so that the printing pressure during paste expansion by the squeegee 61 described later can be supported. ing.

  As shown in FIG. 4, the positioning plates 41a and 41b are provided with a plurality of suction holes 45. Each suction hole 45 is configured to be set to a negative pressure by suction means (not shown) via a suction pipe 46. As will be described later, when the stencil 51 is overlaid on the positioning plates 41a and 41b, the suction hole 45 is set to a negative pressure, whereby the stencil 51 is attracted and held on the upper surfaces of the positioning plates 41a and 41b. It is configured as follows.

  FIG. 7 is a perspective view of the lifting table and the mounting table, and FIG. 8 is a rear view of the lifting table and the mounting table.

  As shown in FIGS. 1 to 5 and FIGS. 7 and 8, the lifting table 24 is provided with a mounting table 29 at a position corresponding to between the pair of main conveyors 20 so as to be vertically movable via a slide column 291 and the like. It has been. The mounting table 29 functions as a first support unit that supports the substrate W, and the elevating table 24 that supports the mounting table 29 functions as a second support unit.

  Between the mounting table 29 and the lifting table 24, lifting driving means 27 for driving the mounting table 29 up and down with respect to the lifting table 24 is provided. The elevating drive means 27 includes a rack and pinion mechanism including an elevating drive shaft 272 that functions as a rack gear and a pinion gear 273 in a gear box 271 that is rotationally driven by a motor 274. The upper end of the elevating drive shaft 272 is attached to the mounting table 29, and the gear box 271 is attached to the elevating table 24. The elevating drive shaft 272 is moved up and down (elevating operation) by the rack and pinion mechanism. Thus, the mounting table 29 is driven up and down with respect to the lifting table 24. By adopting the rack and pinion mechanism in this way, the rotational motion of the motor 274 can be efficiently converted into the linear motion (lifting motion) of the lifting drive shaft 272 to reduce power loss. .

  In this embodiment, two gear boxes 271 constituting a rack and pinion mechanism are provided, and any of the lifting drive shafts 272 that are lifted and lowered by the respective rack and pinion mechanisms is mounted on the mounting table 29 that is lifted and lowered. In the longitudinal direction (X-axis direction). As a result, the lifting drive force from the lifting drive shaft 272 is applied to the central portion of the mounting table (first support means) 29 to eliminate the transmission of the unbalanced lifting driving force that causes the mounting table 29 to tilt. It can be done.

  In addition, the motor 274 serving as a drive source for the pinion gear 273 in the two gear boxes 271 is arranged so as to be reversed by 180 ° with respect to each other via two high-rigidity power transmission shafts 275 and 275 that rotate in reverse with each other. A rotational driving force is transmitted to the box 271. Accordingly, the transmission timing of the raising / lowering driving force by the two raising / lowering driving shafts 272 is prevented.

  One gear box 271 is rotationally driven by a motor 274, and a pinion & driven gear (not shown) in the gear box (main drive) 271 and one highly rigid power transmission shaft 275 connected to the driven gear are provided. The other gear box (driven) 271 may be rotationally driven through the via. In this case, the internal components of the gear box (main drive) 271 and the gear box (follower drive) 271 are partially changed from each other.

  In the present invention, the central portion to which the raising / lowering driving force is transmitted by the support means such as the mounting table 29 refers to a region located at an equal distance from both ends in at least the longitudinal direction.

The slide columns 291 are respectively arranged at four positions near the four corner positions of the mounting table 29, and their upper ends are fixedly coupled to the mounting table 29 and pass through bearings 295 provided on the lifting table 24. Since this bearing 295 does not bear a thrust load, there is very little risk of wear and the like, and the posture can be more reliably regulated in the vertical direction while allowing the slide column 291 to slide in the vertical direction. For this reason, the mounting table 29 coupled to the slide column 291 in the vicinity of the four corner positions moves up and down reliably while maintaining the horizontal state. The slide column 291 and the bearing 295 constitute an operation direction restricting unit that restricts the ascending / descending operation direction of the mounting table 29 and ensures its horizontal state.

  A parallel link mechanism 28 is also provided between the mounting table 29 and the lifting table 24. The parallel link mechanism 28 includes link arms 281 that are arranged at four positions slightly inside the mounting position of the slide column 291 and bend in a dogleg shape. Each of these four link arms 281 is a set of two on the right side and the left side, and its upper end and lower end are rotatably attached to an attachment part coupled to the lifting table 24 and the mounting table 29, all The bent portions of the link arm 281 are connected by a connecting plate 283 via a connecting rod 284 so that the positional relationship is constrained. By providing such a parallel link mechanism 28, the parallel state of the mounting table 29 and the lifting table 24, and thus the horizontal state of the mounting table 29, can be ensured more reliably.

The mounting table 29 includes a substrate mounting plate 292 on which the substrate W is directly mounted, and a base plate 293 that is directly coupled to the slide column 291. Then, by the substrate mounting plate 29 2 is attached to the base plate 29 3 via a mounting screw 294 of the outer four corners from the coupling portion of the slide pillar 291, by adjusting the screwing amount of the mounting screws 294 individually by, which is this even when the base plate 29 3 is very small initial slope or the like can be corrected.

  As described above, the mounting table 29 constitutes the first supporting means for supporting the substrate W, and when it is raised, the substrate W on the main conveyor 20 is transferred onto the mounting table 29 and moved upward. In addition, the substrate W on the placement table 29 is transferred to the main conveyor 20 side by being lowered.

  It should be noted that the mounting table 29 as the first support means is moved up and down with respect to the lift table 24 as the second support means, an elevating drive means 27, an operation direction restricting means comprising a slide column 291 and a bearing 295, and The parallel link mechanism 28 constitutes first lifting means.

  The stencil holding unit 5 provided above the printing stage 10 is configured to hold a stencil 51 having an opening (pattern hole) in a solder application portion in a horizontally stretched state.

  The squeegee unit 6 provided on the upper side of the stencil holding unit 5 has a squeegee holder 62 that is movable along the Y-axis direction. The squeegee holder 62 is provided with a pair of squeegees 61 and 61 that can move up and down. . Then, by moving one squeegee 61 to one side in the Y-axis direction while being lowered, the cream solder S can be expanded on the stencil 51 while rolling (kneading) toward one side in the Y-axis direction, while the other By moving the squeegee 61 to the other side in the Y-axis direction while being lowered, the cream solder S can be expanded on the stencil 51 while rolling toward the other side in the Y-axis direction.

  The screen printing apparatus having this configuration performs the following operation. In the initial state, the elevating table 24 and the placing table 29 are in a lowered state, and the main conveyor 20 is disposed at a position corresponding to the upstream conveyor 11 and the downstream conveyor 12. Furthermore, the clamp pieces 31a and 31b of the clamp unit 3 are in an open state, and the positioning plates 41a and 41b of the positioning unit 4 are in a retracted state.

  From this state, the printed board W is carried into the main conveyor 20 from the upstream conveyor 11, and the board W is conveyed to a predetermined position by the main conveyor 20 as shown in FIG.

  Thereafter, the positioning plates 41a and 41b of the positioning unit 4 are moved inward as shown in FIG. 5B and arranged at the positioning position, and then the mounting table 29 is raised as shown in FIG. I will do it. Then, when the upper surface of the substrate W is in contact with and locked to the lower surfaces (reference surfaces) of the positioning plates 41a and 41b and arranged in the same plane with respect to the upper surfaces of the clamp pieces 31a and 31b, FIG. Thus, when the clamp pieces 31a and 31b are closed, the substrate W is sandwiched and held by the clamp pieces 31a and 31b.

  Subsequently, as shown in FIG. 10 (a), the positioning plates 41a and 41b move outward and are arranged at the retracted position. At this time, the upper surfaces of the positioning plates 41a and 41b and the upper surfaces of the clamp pieces 31a and 31b are arranged in the same plane, and as described above, the upper surfaces of the clamp pieces 31a and 31b and the upper surface of the substrate W are in the same plane. Be placed.

  In the present embodiment, a camera 7 (see FIG. 1) that is movable in the horizontal direction and a cleaner 8 that is movable in the Y-axis direction are provided between the printing stage 10 in the lowered state and the stencil holding unit 5. It has been. The camera 7 identifies the position and type (product number) of the substrate W and the position and type of the stencil 51, and fine adjustment (correction) of the position caused by individual differences and the like, as will be described later, based on the identification information. ) And the like are performed. Further, the stencil 51 is cleaned by the cleaner 8 every time a predetermined number of substrates W are processed.

  Next, as shown in FIG. 4B, when the lift table 24 is raised by a small amount and the main conveyor 20 comes out above the conveyors 11 and 12, the Y-axis table 21 and the X-axis table 22 are used as necessary. The R-axis table 23 is appropriately moved in the Y-axis, X-axis, and R-axis directions, and the horizontal position of the substrate W with respect to the stencil 51 is finely adjusted (corrected).

  When the position is corrected in this way, the lifting table 24 is raised as shown in FIG. 5C, and the positioning plates 41a and 41b, the clamp pieces 31a and 31b, and the upper surface of the substrate W are the lower surfaces of the stencil 51 of the stencil holding unit 5. It is overlaid so that it is superimposed on. Subsequently, the suction holes 35 of the clamp pieces 31a and 31b and the suction holes 45 of the positioning plates 41a and 41b are set to a negative pressure, and the stencil 51 is sucked and fixed to the clamp pieces 31a and 31b and the positioning plates 41a and 41b.

  Thereafter, the one-side squeegee 61 of the squeegee unit 6 descends and moves in the Y-axis direction along the stencil 51, whereby the cream solder S as the paste supplied on the stencil 51 is expanded, and the cream solder S is printed (applied) on a predetermined position of the substrate W through the pattern hole of the stencil 51.

  Here, when performing solder application in the present embodiment, after the area of the squeegee 61 on the stencil 51 corresponding to, for example, the one-side positioning plate 41a and the one-side clamp piece 31a (one-side running area) is run, A region (printing area) on the stencil 51 corresponding to the upper side of W is slid. For this reason, before the cream solder S is applied to the substrate W, the cream solder S is rolled (kneaded) in the run-up area and the viscosity decreases. As a result, the cream solder S is reliably filled in the pattern holes of the stencil 51 and applied to the substrate W with high accuracy.

  After the cream solder S is applied to the substrate W, the lift table 24 is lowered by a small amount, and the substrate W is detached from the stencil 51 (plate separation). Thereafter, if necessary, the Y-axis table 21, the X-axis table 22, and the R-axis table 23 are appropriately moved in the Y-axis, X-axis, and R-axis directions, and the horizontal position of the substrate W is returned to the original position.

  Subsequently, at the same time when the elevating table 24 is lowered, the clamp pieces 31a and 31b are released and the holding on the substrate W is released. Then, the elevating table 24 is returned to the initial lowering position, the mounting table 29 is lowered, and the substrate W is transferred from the mounting table 29 onto the main conveyor 20.

  Next, the substrate W is transported to the downstream conveyor 12 by the main conveyor 20 and sent to the next process via the downstream conveyor 12.

  In this way, the substrate W is carried out to the downstream conveyor 12, while the next substrate W is transferred to the main conveyor 20 by the upstream conveyor 11, and the same printing process as described above is performed. Thus, the substrates W are sequentially fed and sequentially printed.

  As described above, according to the printing apparatus of the present embodiment, the second configuration is such that the ball screw mechanisms 243 arranged at the four corners of the lifting table 24 are synchronously interlocked with a timing belt (not shown) and one motor. The timing belt is made of a polymer material because the positioning of each ball screw is insufficient, the thrust bearing of the support portion of each ball screw shaft is worn, or it is necessary to provide flexibility. There is a possibility that the substrate may be slightly tilted due to a rotational phase difference between the ball screw shafts due to the extension of the timing belt after long-term use. However, since the elevating drive means 27 that elevates and lowers the mounting table 29 with respect to the elevating table 24 is configured to apply an elevating driving force to the center of the mounting table 29, the elevating driving force is applied to the mounting table 29. It is possible to prevent unbalanced transmission to each part. Further, since the elevating direction restricting means including the slide column 291 and the bearing 295 to which the thrust load does not act is provided in the vicinity of the four corner positions of the mounting table 29, the inclination of the mounting table 29 can be prevented. Thereby, the inclination of the base | substrate W when the mounting table 29 raises / lowers can be prevented, and high print quality can be implement | achieved.

  In addition, in the present embodiment, since the parallel link mechanism 28 is provided between the mounting table 29 and the lifting table 24, the parallel state of the mounting table 29 and the lifting table 24, and hence the horizontal state of the mounting table 29, are maintained. It is ensured more reliably, the inclination of the base W when the mounting table 29 moves up and down can be prevented, and high print quality can be realized.

  In this embodiment, since the rack and pinion mechanism is adopted for the lifting drive means 27, the rotational motion of the motor 274 is efficiently converted into the linear motion (lifting motion) of the lifting drive shaft 272, and the power loss is reduced. The mounting table 29 can be driven up and down.

Note in the above embodiment, the elevation driving means 27 for vertically driving the first support means (mount table 29) relative to the second support means (elevating table 24), the longitudinal direction of the loading table 2 9 Although the raising / lowering driving force is transmitted to two places in the central portion, the raising / lowering driving force may be transmitted to only one place in the center in the lateral direction.

  Moreover, in the said embodiment, the slide support | pillar 291 and the bearing 295 which function as an operation | movement direction control means which controls the operation direction with respect to the 2nd support means (elevating table 24) of the 1st support means (mounting table 29) are made into 1st. Although four are provided in the vicinity of the four corner positions of one support means, at least two diagonal positions may be provided. Further, three or more motion direction regulating means including two of the diagonal positions may be provided.

  Moreover, in the said embodiment, although a table type thing (mounting table 29) is used as a 1st support means, it is not restricted only to it, This invention is a board | substrate with a some pin, for example as a 1st support means. Pin-type support means for supporting the above may be adopted.

  In the above-described embodiment, the rack and pinion mechanism is used as the lifting / lowering driving means of the first lifting / lowering means for lifting / lowering the mounting table (first support means) 29. May be configured by a ball screw mechanism or the like.

  Moreover, in the said embodiment, although the 1st raising / lowering means was comprised so that a raising / lowering driving force might be transmitted to the center part of a support means, as a structure which transmits a raising / lowering driving force to the center part of a supporting means, the 2nd raising / lowering means Alternatively, both the first and second elevating means may be configured to transmit the elevating driving force to the central portion of such support means.

It is a side view of the printing apparatus concerning one Embodiment of this invention. It is a front view which shows the said printing apparatus. It is a perspective view which shows the said printing apparatus roughly. It is a perspective view which shows the principal part of the said printing apparatus. It is a side view which shows the clamp unit periphery of the said printing apparatus. FIG. 2 is a perspective view showing a positional relationship of the printing apparatus with respect to a clamp of a positioning plate, where FIG. 1A is a perspective view of a positioning plate retracted position, and FIG. 2B is a perspective view of a positioning plate positioning position. It is a perspective view of a raising / lowering table and a mounting table. It is a rear view of a raising / lowering table and a mounting table. It is a side view for demonstrating operation | movement of the said printing apparatus, Comprising: The figure (a) is a side view at the time of board | substrate carrying in, the figure (b) is a side view at the time of positioning board advance, the figure (c) is a board | substrate. A side view at the time of ascent and FIG. 4D is a side view at the time of substrate clamping. It is a side view for demonstrating operation | movement of the said printing apparatus, Comprising: The figure (a) is a side view of positioning board retraction, The figure (b) is a side view in the raising / lowering table raising, The figure (c) is soldering It is a side view at the time of expansion.

Explanation of symbols

10 Printing stage 24 Lifting table (second support means)
243 Ball screw mechanism (second lifting means)
27 Lifting drive means (first lifting means)
272 Rack 273 Pinion 274 Motor (drive source)
275 Power transmission shaft 28 Parallel link mechanism 29 Placement table (first support means)
291 Slide strut (motion direction regulating means)
292 Substrate placing plate 293 Base plate 295 Bearing (operation direction regulating means)
51 Stencil 61 Squeegee S Cream solder (paste)
W substrate

Claims (2)

A printing apparatus for applying a paste to a substrate supported by a support means,
The support means includes a first support means capable of supporting the substrate, a second support means for supporting the first support means, and a first support means for moving the first support means up and down relative to the second support means. 1 elevating means, and second elevating means for elevating the second support means relative to the apparatus main body,
At least one of the first and second elevating means includes at least diagonal positions of the elevating drive means for applying elevating driving force to the central portion of the first or second support means, and the first or second support means And an operation direction restricting means for restricting the operation direction .
The elevating driving means for elevating and driving the first supporting means with respect to the second supporting means includes two rack and pinion mechanisms,
The rack and pinion mechanism is disposed at two locations in the center with respect to the longitudinal direction of the first support means,
One rack and pinion mechanism is driven by a motor, and the rotational driving force of this one rack and pinion mechanism is transmitted to the other rack and pinion mechanism via a power transmission shaft,
At least one of the first and second lifting means includes a parallel link mechanism,
The parallel link mechanism is provided between the first support means and the second support means,
The parallel link mechanism includes four link arms that are respectively arranged at four positions slightly inside near the four corner positions of the first support means and bend in a dogleg shape.
The link arm is arranged in a line-symmetric position about a line connecting the two rack and pinion mechanisms,
Each of the four link arms is a pair, and the upper end portion and the lower end portion thereof are rotatably attached to the first support means and the second support means, and the bent portions of all the link arms. but printing apparatus characterized that you have been connected by a connecting plate. The printing apparatus according to claim 1, wherein the operation direction restricting unit is disposed in the vicinity of the four corner positions of the first or second support unit.

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