JP2008246760A - Printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing device capable of effectively using a printing material and attaining high quality printing. <P>SOLUTION: The printing device 1 has a printing material feeding means 19 feeding the printing material M, a printing roller 11 capable of carrying out translation motion and arranged so as to roll forward based on the direction Y1 of the translation motion and a squeegee 41 arranged so as to push and press a substrate K to be printed following the translation motion of the printing roller 11, and is constituted so as to print the printing material M fed from the printing material feeding means 19 to the substrate K to be printed by the translation motion and rotation by the printing roller 11 and the pushing and pressing by the squeegee 41. The step portions 15 are arranged in both end portions of the printing roller 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a printing apparatus. More specifically, the printing material supply means for supplying the printing material, the printing roller that is capable of translational movement and provided to rotate forward with reference to the direction of translational movement, and the translational movement of the printing roller follow. And a squeegee provided so as to press the printed substrate, and the printing material supplied from the printing material supply means is printed on the printed substrate by translation and rotation by a printing roller and pressing by the squeegee. Related to the printing apparatus.

  As this type of printing apparatus, for example, an apparatus described in Patent Document 1 can be cited. FIG. 6 is a partial front sectional view showing a main part of a conventional printing apparatus. As shown in FIG. 6, the conventional printing apparatus includes a substrate holding stage 4, a screen mask 5, a first squeegee 410, a second squeegee 420, a printing roller 11, a horizontal driving unit 12, a rotation driving unit 13, and a vertical driving unit 18. The first squeegee driving unit 43 and the second squeegee driving unit 44 are provided.

  The printing roller 11 can be selectively rotated in the forward and reverse directions by the rotation driving unit 13. Further, translational movement is enabled by the horizontal drive unit 12. The first squeegee 410 and the second squeegee 420 are configured to translate together with the printing roller 11. In addition, the first squeegee 410 and the second squeegee 420 can be selectively placed alternately at the pressing position P1 (lower side) and the retreating position P2 (upper side) according to the translational movement direction Y1 or Y2. It is said.

  The operation of the conventional printing apparatus will be described. In FIG. 6, the circuit board K to be printed with the printing material M is placed and held on the substrate holding stage 4, and the screen mask 5 is overlaid and fixed on the circuit board K.

  First, forward printing is performed. First, the printing roller 11 is made to stand by in the vicinity of the screen mask 5 by driving the vertical driving unit 18. Subsequently, the first squeegee driving unit 43 is driven to place the first squeegee 410 in the pressing position P1, and the second squeegee driving unit 44 is driven to place the second squeegee 420 in the retracted position P2.

  Subsequently, the printing material M is supplied to the peripheral surface of the printing roller 11 or one surface of the screen mask 5 by the printing material supply unit 19. Then, the printing roller 11 is moved forward in the Y1 direction along one surface of the screen mask 5 while the peripheral surface of the printing roller 11 is brought close to one surface of the screen mask 5, and at the same time, the printing roller 11 is rotated forward in the clockwise direction. To drive.

  In the process in which the printing roller 11 moves forward while rotating forward, the first squeegee 410 follows the printing roller 11 and presses one surface of the circuit board K through the screen mask 5 while translating in the Y1 direction. Since the first squeegee 410 is pressed against one surface of the screen mask 5, the printing material M pushed between the printing roller 11 and the screen mask 5 is restricted from escaping backward with respect to the moving direction of the printing roller 11. Is done. In other words, the printing material M is fed between the printing roller 11 and the screen mask 5 by the rotation and translational movement of the printing roller 11, and is strong by the resultant force of the filling force of the first squeegee 410 and the filling force of the printing roller 11. While being pressurized, the pattern hole 51h is pushed and filled.

When the forward printing is finished, the backward printing is performed. During reverse printing, the first squeegee 410 is in the retracted position P2 (upper side), and the second squeegee 420 is in the pressing position P1 (lower side). The printing roller 11 translates in the Y2 direction and is driven in reverse (counterclockwise direction) to perform a printing operation in the same manner as forward printing. The printing material M pressed and filled into the pattern hole 51h by such forward and backward printing is discharged from the pattern hole 51h by differential pressure filling or the like to the printed portion Kh such as a through hole formed in the circuit board K. Form a pattern.
Japanese Patent Laid-Open No. 2005-229094

  In the printing apparatus described above, the space S <b> 1 surrounded by the printing roller 11 and the first squeegee 410 is closed except for both ends of the printing roller 11. The printing material M is fed into the closed space S1 by the rotation of the printing roller 11, and the pressure rises. Due to the increase in pressure, a part of the supplied printing material M protrudes from the both ends of the printing roller 11 one after another as the printing roller 11 rotates and translates, and the screen mask 5 and the printing apparatus are soiled. In the embodiment in which the printing roller 11 is directly rotated and translated with respect to the circuit board K without using the screen mask 5, the protruding printing material M contaminates the circuit board K, the substrate holding stage 4 and the printing apparatus. In any case, since the amount of the printing material M corresponding to the protruding amount has to be replenished one after another, the printing material M is wasted.

  Further, the printing material M in the vicinity of both ends of the printing roller 11 adheres around the both ends of the printing roller 11 and rotates around. The adhering printing material M becomes a factor that causes density unevenness by drying over time. Further, although the printing material M is pressurized by the rotation of the printing roller 11, the pressure is continuously reduced at a stroke until it passes the squeegee contact and reaches the upstream side of the printing roller 11 (see FIG. 5B). For this reason, the bubbles contained in the printing material M cannot be sufficiently removed, which causes a reduction in printing quality.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a printing apparatus that can effectively use a printing material and realize high-quality printing.

  In order to achieve the above object, the printing apparatus of claim 1 includes a printing material supply means (19) for supplying the printing material (M), a translational movement and a direction (Y1) of the translational movement. A printing roller (11) provided to rotate forward, and a squeegee (41) provided to press the printed substrate (K) following the translational movement of the printing roller (11), The printing material (M) supplied from the printing material supply means (19) is configured to be printed on the printing substrate (K) by translation and rotation by the printing roller (11) and pressing by the squeegee (41). The printing apparatus (1) is characterized in that step portions (15) are provided at both ends of the printing roller (11).

  According to the printing apparatus of claim 1, since both end portions of the printing roller (11) are stepped portions (15) as shown in FIG. 3, the squeegee (41) and the printing roller (11) A wide space is formed between the two. This wide space makes it difficult for the pressure of the printing material (M) to rise more than the conventional one (see FIG. 5B) (see FIG. 5A), so that it protrudes outward from both ends of the printing roller (11). The amount of the printing material (M) is suppressed.

  The printing apparatus according to claim 2, wherein the stepped portion (15) has a substantially bracket shape in which an opening when seen in a plan view opens toward the printing roller (11) and is formed on the printed substrate (K). A scraping guide (16) that can be pressed against is provided.

  According to the printing apparatus of the second aspect, the scraping guide (16) moves in the translational movement direction (Y1) while pressing the substrate (K) to be printed along with the translational movement of the printing roller (11). The second half of the scraping guide (16) based on the translation direction (Y1) drives the printing material (M) remaining upstream in the translation direction (Y1) in the translation direction (Y1). Therefore, the printing material (M) on the upstream side moves toward the center of the substrate (K) to be printed, and the printing material (M) can be used effectively.

  The printing apparatus according to claim 3 further comprises a protrusion preventing member (8) disposed opposite and parallel to each other along the translational movement direction (Y1) of the printing roller (11) with the printing roller (11) interposed therebetween. Prepare.

  According to the printing apparatus of the third aspect, the protrusion preventing member (8) restricts the printing material (M) from protruding outside the printing roller (11), so that the printing material (M) overflows to the outside. There is no.

  The printing apparatus according to claim 4, wherein the squeegee (41) has a hardness higher than that of the printing roller (11) and is 60 to 80 degrees, and the thickness (T) of the attack portion is 10 mm or more. The attack angle (θ) is an acute angle of 5 ° to 10 °.

  According to the printing apparatus of the fourth aspect, the pressure by the squeegee (41) can be reliably transmitted to the printing material (M).

  The printing apparatus according to claim 5, wherein the printing roller (11) and the squeegee (41) have a constant interval (d) in a state where the squeegee (41) is in the pressing position (P1), and even during a printing operation. The interval (d) is configured to be maintained.

  According to the printing apparatus of the fifth aspect, with the above configuration, the printing material (M) is pressurized in two stages as shown in FIG. That is, since the pressure of the pressurized printing material (M) can be once released, the bubbles confined in the printing material (M) can be sufficiently discharged, and the pressing force can be improved. As a result, the quality of the printed product can be improved.

  The printing apparatus according to claim 6 includes a doctor knife (17A) for scraping off the printing material (M) attached to the printing roller (11). According to a seventh aspect of the present invention, the printing apparatus includes a screen mask (5) interposed between the printing roller (11) and the squeegee (41) and the substrate to be printed (K).

  In addition, the reference numerals in parentheses attached to each component in each column of the means for solving the claims and the problem correspond to the representative ones of the specific means described in the embodiments described later. It is shown.

  ADVANTAGE OF THE INVENTION According to this invention, the printing apparatus which can implement | achieve good quality printing while being able to use a printing material effectively is provided.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic front view of a printing apparatus according to the present invention, FIG. 2 is a view taken along line I-I in FIG. 1, FIG. 3 is a view taken along arrow C in FIG. FIG. 5 is a partial front view of the material pressing portion, and FIG. 5 is a pressure fluctuation of the printing material during printing by the printing apparatus according to the present invention (FIG. A) and a pressure fluctuation of the printing material during printing by the conventional printing apparatus (FIG. B). FIG. In each figure, the three axes of the orthogonal coordinate system are X, Y, and Z, the XY plane is the horizontal plane, and the Z direction is the vertical direction.

  As shown in FIG. 1, a printing apparatus 1 according to the present invention includes a chamber 2, a vacuum generation unit 3, a substrate holding stage 4, a screen mask 5, a printing material pressing unit 6, and a control device 7.

  The chamber 2 forms a sealed space in which the substrate holding stage 4, the screen mask 5, and the printing material pressing unit 6 can be stored, and an upper surface of the chamber 2 is an acrylic resin lid 21 that can be opened and closed. The lid body 21 has such a rigidity that it can withstand even if the internal vacuum reaches 50 Pa to 100 Pa. The sealed space is separated into an upper sealed chamber 22 and a lower sealed chamber 23 by installing a screen mask 5.

  The vacuum generation unit 3 includes a vacuum pump 31, a leak valve 32, a leak valve 33, a stop valve 34 and a stop valve 35. The vacuum pump 31 is connected to the upper sealed chamber 22 through a stop valve 34 and a leak valve 32. The pipe is connected to the lower sealed chamber 23 through the stop valve 35 and the leak valve 33. By combining the opening and closing operations of these valves, a vacuum can be freely generated in the upper sealed chamber 22 and / or the lower sealed chamber 23.

  The substrate holding stage 4 includes a placement surface 4a on which the circuit board K is placed horizontally. The mounting surface 4a is processed to have sufficient flatness, and includes a number of minute suction holes for holding the mounted circuit board K by vacuum suction. Further, the substrate holding stage 4 can be driven in the vertical direction so that the height can be adjusted. In addition, positioning pins for positioning the circuit board K are provided.

  As shown in FIGS. 2 and 3, the screen mask 5 includes a mask main body 51, a mask support 52 and a frame 53. The mask main body 51 is made of a metal thin plate made of a metal such as stainless steel and having a thickness of about 0.05 mm to 2 mm, and includes a pattern hole 51h corresponding to a target print pattern. The mask support 52 is made of a magnetic material such as iron or magnetic stainless steel, and is made of a thin metal plate having a thickness similar to that of the mask body 51 and penetrating inside. The mask support 52 is integrated with the mask main body 51 by joining means such as welding at the inner edge thereof. The frame 53 is made of a metal such as stainless steel and is attached to the mask support 52 so as to form a weir having a height of about 1 cm to 2 cm. That is, the frame 53 surrounds the joined body of the mask main body 51 and the mask support 52.

  Two protrusion preventing members 8 are detachably attached to the screen mask 5. The protrusion preventing member 8 is made of a long rail material made of a metal such as stainless steel or aluminum. In plan view, it has a substantially “I” shape with a thick portion 81 at both ends. Both front and back surfaces of the protrusion preventing member 8 are flat surfaces. Permanent magnets 82 are embedded in the back surface of each thick portion 81. The protrusion preventing member 8 is fixed to the screen mask 5 by magnetically attracting the permanent magnet 82 to the surface of the mask support 52. Since the magnetic attraction is used, the protrusion preventing member 8 can be easily attached to and detached from the screen mask 5, and its mounting position can be changed as appropriate according to the width of the mask main body 51.

  As shown in FIG. 4, the printing material pressing unit 6 includes a printing material supply unit 19, a roller assembly 61, and a squeegee assembly 62.

  The printing material supply unit 19 includes a storage tank that stores the printing material M, a pump that pumps the printing material M in the storage tank, and a discharge nozzle that discharges the printing material M that has been fed. In FIG. 4, only the discharge nozzle is shown. As the printing material M, a liquid resin such as an epoxy resin mixed with a filler (for sealing), a conductive paste / epoxy resin with a copper or silver content of 80% or more with an epoxy resin as a binder, copper or silica gel, etc. Non-conductive paste mixed with filler (for filling holes), solder paste (for bump formation), polyimide resin / liquid resist (for circuit board insulation), and the like.

  The roller assembly 61 includes a printing roller 11, a scraping guide 16, a horizontal driving unit 12, a rotation driving unit 13, and a vertical driving unit 18. The surface of the printing roller 11 is a rotation pressing surface, and is supported by a shaft 14 so as to be rotatable about a horizontal axis. Both ends of the printing roller 11 are stepped portions 15 (see FIGS. 2 and 3). The step portion 15 is formed by the difference between the diameter of the printing roller 11 and the diameter of the shaft 14. The step portion 15 may be formed by, for example, tapering the both ends of the printing roller 11. Alternatively, the print roller 11 may be formed by providing grooves on the outer periphery in the vicinity of both ends.

  The scraping guide 16 is attached so as to penetrate the shaft 14 at the step portion 15. The shape exhibits a substantially bracket shape in which the opening when viewed in plan opens toward the printing roller 11 (see FIG. 2). In addition, it is good also as a general substantially bracket shape with roundness without a corner | angular part, without using a substantially bracket shape. The scraping guide 16 can be pressed against the mask main body 51 of the screen mask 5 independently of the first squeegee 41 and the second squeegee 42.

  The horizontal drive unit 12 is configured to allow the printing roller 11 to move in the translation direction Y along one surface of the circuit board K. Specifically, for example, a rack arranged along the translational direction Y and a pinion that meshes with the rack and moves linearly while rotating can be used. The moving direction of the printing roller 11 by the horizontal driving unit 12 is a forward direction and a backward direction, and the forward direction is denoted as Y1 and the backward direction as Y2.

  The rotation driving unit 13 is configured to rotationally drive the printing roller 11 while the horizontal driving unit 12 translates the printing roller 11. The rotation of the printing roller 11 in the forward direction (clockwise direction in the figure) is the forward rotation, and the rotation in the opposite direction, that is, the forward direction with respect to the backward direction Y2 (see FIG. The rotation in the counterclockwise direction is reversed. The vertical drive unit 18 is configured to allow the printing roller 11 to move in the vertical direction. Above the printing roller 11, a first doctor knife 17A and a second doctor knife 17B are provided. These two doctor knives 17A and 17B are provided so as to sandwich the printing roller 11, and scrape the printing material M adhering to the printing roller 11.

  The squeegee assembly 62 includes a first squeegee 41, a second squeegee 42, a first squeegee drive unit 43, and a second squeegee drive unit 44. The first squeegee 41 and the second squeegee 42 are provided on the front and rear objects with the printing roller 11 as a boundary and based on the forward movement direction Y1. The hardness of the first squeegee 41 and the second squeegee 42 is 60 to 80 degrees, which is higher than the hardness of the printing roller 11. The thicknesses T of the attack parts of the first squeegee 41 and the second squeegee 42 are each 10 mm or more, preferably 15 mm or more. The attack angle θ with respect to the mask body 51 is an acute angle of 5 ° to 10 °. As a result, the first squeegee 41 and the second squeegee 42 can reliably transmit the pressure to the printing material M.

  The first squeegee driving unit 43 is configured to include an air cylinder and a link mechanism so that the first squeegee 41 can turn along the circumferential surface of the printing roller 11. Specifically, it is rotatably attached to the slide 411 via the operating rod 412. The second squeegee driving unit 44 is configured similarly to the first squeegee driving unit 43.

  The first squeegee driving unit 43 and the second squeegee driving unit 44 selectively select the first squeegee 41 and the second squeegee 42 in the pressing position P1 and the retracting position P2 described below according to the translation direction Y of the printing roller 11. Can be arranged alternately. That is, the pressing position P <b> 1 is a position where the first squeegee 41 or the second squeegee 42 is in an upright posture and pressed against one surface of the mask body 51. The retreat position P2 is a position where the first squeegee 41 or the second squeegee 42 is in an inclined posture and is lifted from one surface of the mask main body 51. FIG. 4 shows a state where the first squeegee 41 is in the pressing position P1 and the second squeegee 42 is in the retracted position P2 (see the solid line portion). The first squeegee 41 or the second squeegee 42 in front of the printing roller 11 with respect to the translation direction Y becomes the retracted position P2, and the first squeegee 41 or second squeegee 42 in the rear becomes the pressing position P1.

  The printing roller 11 and the first squeegee 41 are configured to have a constant interval d in a state where the first squeegee 41 is in the pressing position P1, and to maintain this interval d during the printing operation. The same applies to the positional relationship between the printing roller 11 and the second squeegee 42.

  The control device 7 includes an input / output device such as a touch panel, appropriate hardware mainly including a memory chip and a microprocessor, a hard disk device incorporating a computer program for operating the hardware, and data communication with each component. The printing apparatus 1 is configured to send a command signal for performing a series of printing operations to each component.

  Next, the printing operation of the printing apparatus 1 will be described.

  First, the circuit board K is placed on the substrate holding stage 4. Then, the circuit board K is positioned using positioning pins (not shown) provided on the substrate holding stage 4 and further held by vacuum suction. Subsequently, the screen mask 5 is superposed on the circuit board K and fixed. Note that the screen mask 5 is not necessary when an appropriate place on one surface of the circuit board K is previously laminated (coated) with a film or the like.

  First, forward printing is performed. That is, first, the printing roller 11 is made to stand by in the vicinity of the screen mask 5 by driving the vertical driving unit 18. Subsequently, the first squeegee drive unit 43 is driven to place the first squeegee 41 in the pressing position P1, and the second squeegee drive unit 44 is driven to place the second squeegee 42 in the retracted position P2 (FIG. (See solid line part 4).

  Subsequently, the printing material M is supplied to the peripheral surface of the printing roller 11 or one surface of the screen mask 5 by the printing material supply unit 19. Subsequently, the lid 21 is closed, the stop valves 34 and 35 are opened, and the vacuum pump 31 is operated with the leak valves 32 and 33 closed, whereby the upper sealed chamber 22 and the lower sealed chamber 23 are simultaneously evacuated. To do. In this process, bubbles (voids) hidden inside the printing material M under atmospheric pressure can be discharged (defoamed).

  Subsequently, while moving the printing roller 11 in the forward movement direction Y1 while bringing the peripheral surface of the printing roller 11 close to one surface of the screen mask 5, the printing roller 11 is rotated forward.

  In the process in which the printing roller 11 moves forward while rotating forward, the first squeegee 41 follows the printing roller 11 and presses one surface of the circuit board K through the screen mask 5. Since the first squeegee 41 is pressed against one surface of the screen mask 5, the printing material M pushed between the printing roller 11 and the screen mask 5 is restricted from escaping backward with respect to the moving direction of the printing roller 11. Is done. In other words, the printing material M is fed between the printing roller 11 and the screen mask 5 by the rotation and translational movement of the printing roller 11, and is strong by the resultant force of the filling force of the first squeegee 41 and the filling force of the printing roller 11. While being pressurized, the pattern hole 51h is pushed and filled.

  During forward printing, a part of the supplied printing material M protrudes outward from both ends of the printing roller 11 as the first squeegee 41, the second squeegee 42, and the printing roller 11 move in translation. This is because the pressure of the printing material M increases in the space surrounded by the first squeegee 41 and the printing roller 11.

  According to the printing apparatus 1, as shown in FIGS. 2 and 3, both end portions of the printing roller 11 are formed with step portions 15, so that a wide space surrounded by the first squeegee 41 and the printing roller 11. Is formed. Because of this wide space, the pressure of the printing material M is less likely to increase than in the past (see FIG. 5B) (see FIG. 5A), so the printing material M that protrudes outward from both ends of the printing roller 11 The amount is suppressed.

  Further, the printing roller 11 and the first squeegee 41 are configured to have a constant interval d in a state where the first squeegee 41 is in the pressing position P1, and to maintain this interval d during printing. As a result, as shown in FIG. 5A, the printing material M is pressurized in two stages. That is, since the pressure of the pressurized printing material M can be once released, the bubbles confined in the printing material M can be sufficiently discharged, and the pressing force can be improved. As a result, good quality printing can be realized.

  Further, at the time of forward printing, the lower half (FIG. 2) of the scraping guide 16 moves while driving the printing material M remaining on the screen mask 5 in the forward direction Y1, so that the upstream of the forward direction Y1. The printing material M on the side moves toward the center of the screen mask 5 and is used effectively during reverse printing.

  Furthermore, since the protrusion preventing member 8 restricts the printing material M from protruding outward in the X direction of the mask main body 51, the printing material M does not overflow to the outside.

  The forward printing has been described above. However, the backward printing is basically performed in the same manner as the forward printing. That is, during reverse printing, the first squeegee 41 is in the retracted position P2, and the second squeegee 42 is in the pressing position P1 (see the one-dot chain line portion in FIG. 4). Then, the printing roller 11 moves in the backward movement direction Y2 while being reversely rotated. At the time of reverse printing, the upper half (FIG. 2) of the scraping guide 16 moves while returning the printing material M remaining on the mask main body 51 in the backward movement direction Y2, so that the upstream side of the backward movement direction Y2 The existing printing material M moves toward the center of the screen mask 5. Thereby, the printing material M can be used effectively.

  The positional relationship between the printing roller 11 and the second squeegee 42 is the same as the positional relationship between the printing roller 11 and the first squeegee 41, and the printing material M is disposed at both ends of the printing roller 11 as in forward printing. The amount of protrusion from the outside is suppressed. And the bubble confine | sealed in the printing material M can fully be discharged | emitted, and a pressurizing force can be improved. As a result, good quality printing can be realized.

  When the reciprocating printing operation is completed, a differential pressure is generated by the vacuum generating unit 3 between the upper sealed chamber 22 and the lower sealed chamber 23 separated by the screen mask 5. That is, closing the stop valve 34 and opening the leak valve 32 increases the pressure in the upper sealed chamber 22. As a result, the printing material M tends to be pushed downward from the pattern holes 51 h of the screen mask 5. Furthermore, if the substrate holding stage 4 is slightly lowered, the printing material M is satisfactorily transferred to the circuit board K without remaining in the pattern holes 51h. In other words, the printing material M forms a pattern on a printing portion Kh such as a through-hole formed in the circuit board K through the pattern hole 51h. Thereafter, the upper sealed chamber 22 and the lower sealed chamber 23 are returned to atmospheric pressure, the lid 21 is opened, the screen mask 5 is further removed, and the circuit board K is removed from the printing apparatus 1 to complete the series of manufacturing steps. .

  As mentioned above, although embodiment of this invention was described, embodiment disclosed above is an illustration to the last, Comprising: The scope of the present invention is not limited to these embodiment. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment, printing is performed through the screen mask 5, but a form in which the circuit board K is directly pressed and filled without the screen mask is also possible. In this case, for example, the substrate holding stage 4 is raised and a circuit board having the same size as the screen mask 5 is installed in place of the screen mask 5. In the form without the screen mask, the protrusion preventing member 8 is fixed on the circuit board or on both sides by an appropriate fixing means such as a screw or a clip. In this case, the protrusion preventing member 8 restricts the printing material M from protruding outward in the X direction of the circuit board, so that the printing material M does not overflow to the outside.

1 is a schematic front view of a printing apparatus according to the present invention. It is the II arrow directional view of FIG. It is C arrow line drawing of FIG. It is a front fragmentary sectional view of the printing material press part in the printing apparatus which concerns on this invention. It is a comparison figure of the pressure fluctuation (A figure) of the printing material at the time of printing by the printing apparatus which concerns on this invention, and the pressure fluctuation (B figure) of the printing material at the time of printing by the conventional printing apparatus. It is a front fragmentary sectional view of the printing material press part in the conventional printing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing apparatus 5 Screen mask 8 Overflow prevention member 11 Printing roller 15 Step part 16 Scraping guide 17A 1st doctor knife (doctor knife)
17B Second Doctor Knife (Doctor Knife)
19 Printing Material Supply Unit 41 First Squeegee (Squeegee)
42 Second Squeegee
d Interval K Circuit board (printed board)
M Printing material P1 Pressing position T Thickness Y1 Direction of translation θ Attack angle

Claims (7)

  A printing material supply means (19) for supplying the printing material (M), a printing roller (11) that is capable of translational movement and is provided to rotate forward with reference to the direction of translational movement (Y1), A squeegee (41) provided to press the printed substrate (K) following the translational movement of the printing roller (11), and the printing material (M) supplied from the printing material supply means (19) In the printing apparatus (1) configured to print on the substrate to be printed (K) by translation and rotation by the printing roller (11) and pressing by the squeegee (41), both ends of the printing roller (11) A printing apparatus characterized in that a step (15) is provided for each.   The stepped portion (15) has a substantially bracket shape in which an opening in a plan view opens toward the printing roller (11) and can be pressed against the printed substrate (K). The printing apparatus according to claim 1, comprising: (16).   The protrusion prevention member (8) arrange | positioned mutually facing parallel along the direction (Y1) of translational movement of the printing roller (11) on both sides of the said printing roller (11). The printing apparatus as described in.   The squeegee (41) has a hardness higher than that of the printing roller (11) and is 60 to 80 degrees, the thickness (T) of the attack portion is 10 mm or more, and the attack angle (θ The printing apparatus according to claim 1, wherein an acute angle of 5 ° to 10 ° is set.   The printing roller (11) and the squeegee (41) have a certain interval (d) in a state where the squeegee (41) is in the pressing position (P1), and this interval (d) is maintained during the printing operation. The printing apparatus according to claim 1, configured as described above.   The printing apparatus according to any one of claims 1 to 5, further comprising a doctor knife (17A, 17B) for scraping off the printing material (M) attached to the printing roller (11).   The printing apparatus according to any one of claims 1 to 6, further comprising a screen mask (5) interposed between the printing roller (11) and the squeegee (41) and the substrate to be printed (K).

Images