JP7130160B1 - Squeegee mechanism in screen printer - Google Patents

Abstract

A squeegee mechanism is provided in which a squeegee can be tilted with respect to a screen mask and moved in the front-rear and left-right directions. A linear motor (1) and a linear guide (2) for moving sliders (1a, 2a) in the front-rear direction are arranged on a base. A linear motor 4 for moving a slider 4a is provided on a bridge member 3 bridging between a linear motor 1 and a slider of a linear guide 2. - 特許庁A slider 4a of the linear motor 4 is provided with a linear motor for moving the slider in the vertical direction. A vertical movement supporting plate 7 is attached to the slider of the linear motor, and a moving base 8 is horizontally attached to the lower end of the vertical movement supporting plate 7 . The moving base 8 is provided with a print head section rotating mechanism 9 for rotating the print head section 16 about its axis. The print head unit 16 includes a squeegee elevating mechanism capable of adjusting printing pressure, and a printing agent scooping mechanism 24 that scoops up the printing agent on the screen mask with a scraper. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a squeegee mechanism in a screen printer, and more particularly, the squeegee can be moved back and forth, left and right, and obliquely with respect to the screen mask, and the squeegee can move along the screen mask. On the other hand, it relates to a squeegee mechanism that can be tilted and moved in the front-rear and left-right directions.

A squeegee mechanism in a conventional screen printer has a squeegee moving direction fixed to the front and back or left and right with respect to the screen mask.

However, depending on the shape of the pattern of the screen mask, it may be possible to obtain better printing results by changing the angle of the squeegee moving direction with respect to the screen mask.

For example, as shown in FIG. 13, when the pattern 101 formed in the screen mask 100 consists only of the pattern openings 101A that are long in the front-rear direction (Y-axis direction) with respect to the screen mask 100, the squeegee is moved in the front-rear direction (Y-axis direction). When the squeegee is moved in the left-right direction ( X-axis direction), as shown in FIG. 14(B), the fluidity of the solder paste P in the pattern openings 101A is low, so that a sufficient filling amount cannot be obtained. In this case, printing unevenness occurs.

In the case of such a pattern 101, in the case of a squeegee mechanism that moves the squeegee in the longitudinal direction (Y-axis direction) with respect to the screen mask, the movement of the squeegee may remain as it is, or in the lateral direction with respect to the screen mask. In the case of a squeegee mechanism that moves the squeegee (in the X-axis direction), this can be dealt with by changing the orientation of the screen mask by 90 degrees.

However, as shown in FIG. 15, the pattern 101 formed on the screen mask 100 has pattern openings 101A that are long in the front-rear direction (Y-axis direction) with respect to the screen mask 100, and pattern openings 101A that are long in the horizontal direction (X-axis direction) with respect to the screen mask 100. In the case of combination with pattern openings 101B that are long in the axial direction), a squeegee mechanism that moves the squeegee in the front-rear direction (Y-axis direction) with respect to the screen mask 100 and a squeegee mechanism in the horizontal direction (X-axis direction) with respect to the screen mask. Since the squeegee mechanism for moving the squeegee in the direction ) is as described above, it is impossible to evenly and sufficiently fill the pattern openings 101A and 101B of the pattern 101 with the solder paste in any of them.

Therefore, as a result of extensive research by the inventors of the present invention, as shown in FIGS. It has been found that the pattern openings 101A and 101B of the pattern 101 can be evenly and sufficiently filled with the bonding paste by utilizing the bonding paste filling action when the squeegee is moved. The terms "bonding paste" and "printing agent" used in this specification include not only solder paste, but also suitable materials such as flaking material and silver paste within the scope of the present invention.

The present invention has been made in view of the above points. In addition, a single unit can sufficiently cope with a combination of pattern openings that are long in the front-rear direction and pattern openings that are long in the left-right direction with respect to the screen mask. To provide a squeegee mechanism in a screen printer capable of changing the angle of the squeegee quickly and accurately.

The gist of the present invention is that a front-rear drive linear motor for moving a slider in the front-rear direction and a linear guide are arranged in parallel on a base, and a front-rear drive linear motor and a linear guide are arranged between the sliders. A horizontal drive linear motor for moving the slider in the horizontal direction is provided on the bridge member bridging between the horizontal drive linear motor, a vertical drive linear motor for moving the slider in the vertical direction is provided on the slider of the horizontal drive linear motor, and the vertical drive linear motor is provided for moving the slider in the vertical direction. A vertical movement support plate is attached to the slider of the motor, and a horizontal movement base is attached to the lower end of the vertical movement support plate. A squeegee mechanism for a screen printing machine comprising a print head rotation mechanism that allows the print head rotation mechanism to rotate, the rotation drive motor vertically fixed to a moving base and capable of adjusting the rotation angle, and a speed reducer. and in a screen printing machine, which is a print head rotation mechanism comprising a rotation shaft connected to the rotation shaft of the rotation drive motor via a coupling, and a print head connection plate fixed to the lower end of the rotation shaft in the squeegee mechanism.

Further, in the above configuration, the print head unit connected to the print head unit rotation mechanism scoops up the printing agent on the screen mask using a squeegee elevating mechanism capable of adjusting printing pressure and a scraper. wherein the squeegee elevating mechanism capable of adjusting the printing pressure includes a low-friction cylinder whose pressure is adjusted by an electro-pneumatic regulator, a floating joint connected to the piston rod of the low-friction cylinder, and connected to the floating joint. A squeegee mechanism for a screen printing machine, which is a squeegee elevating mechanism capable of adjusting printing pressure, comprising a load cell connected to the load cell, a squeegee bar connected to the load cell, and a squeegee holder and squeegee attached to the squeegee bar. .

Further, in the above configuration, the print head unit connected to the print head unit rotation mechanism scoops up the printing agent on the screen mask using a squeegee elevating mechanism capable of adjusting printing pressure and a scraper. The printing agent scooping mechanism includes a spatula-shaped scraper facing the squeegee, a scraper opening/closing arm holding the scraper at the lower end, and a fulcrum for vertically rotating the scraper opening/closing arm. A screen printing machine, which is a printing agent scooping mechanism comprising a rotating support shaft, a connecting rod that connects the upper end of the scraper opening/closing arm and the piston rod of the cylinder, and a cylinder that rotates the scraper opening/closing arm. The squeegee mechanism in is also the gist thereof.

Further, in the above configuration, the print head unit connected to the print head unit rotation mechanism scoops up the printing agent on the screen mask using a squeegee elevating mechanism capable of adjusting printing pressure and a scraper. and a print head section in which a print head section rotation mechanism connection plate provided at the upper end is detachably connected to the print head section connection plate in the print head section rotation mechanism; The squeegee elevating mechanism capable of adjusting the printing pressure and the printing material scooping mechanism are supported on a pair of supporting plates vertically provided in parallel with the central portion of the print head rotation mechanism connecting plate in the longitudinal direction. The central portion of the swingable support rod is pivotally connected to the pivot shaft, and both ends of the swingable support rod are provided at both side ends of the swingable support rod. A squeegee mechanism in a screen printing machine, in which the squeegee and the screen mask are adjusted to a position parallel to each other by abutting push-down adjustment bolts and held, is also the gist of the present invention.

Further, in the above configuration, the present invention provides that the connection between the print head rotation mechanism connection plate in the print head portion and the print head connection plate in the print head rotation mechanism is arranged in the longitudinal direction of the print head connection plate. A long hole with an enlarged diameter on one end side is provided in the vicinity of both ends of the print head rotation mechanism connecting plate, and a shaft having an enlarged head is provided at the same position as the long hole provided in the print head portion connecting plate in the print head rotating mechanism connecting plate. A squeegee mechanism for a screen printing machine, in which the shaft body is erected, inserted through an enlarged diameter portion of an elongated hole provided in the print head connection plate, and then shifted laterally to be connected. , is the gist of it.

Since the present invention is configured as described above, the squeegee can be moved in the front-rear, left-right and oblique directions with respect to the screen mask, and the squeegee can be obliquely moved in the front-rear and left-right directions with respect to the screen mask. It will be possible to move to Therefore, in addition to the case where the shape of the pattern formed on the screen mask consists only of pattern openings that are long in the front-back direction or the left-right direction with respect to the screen mask, pattern openings that are long in the front-back direction with respect to the screen mask and screen Even in the case of combination with pattern openings that are long in the left-right direction with respect to the mask, a single unit can sufficiently cope with the case.

Also, the print head rotation mechanism includes a rotation drive motor vertically fixed to the movement base and capable of adjusting the rotation angle, a rotation shaft connected to the rotation shaft of the rotation drive motor through a reduction gear and a coupling, Since the print head rotation mechanism is composed of the print head connection plate fixed to the lower end of the rotation shaft, the rotation of the print head about the axis can be automatically performed by the motor. It is possible to quickly change the rotation angle of the head part without stopping the operation of the machine. In addition, it is possible to accurately set the rotation angle.

Further, the print head section connected to the print head section rotation mechanism is provided with a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism for scooping the printing agent on the screen mask with a scraper. An adjustable squeegee lifting mechanism is composed of a low friction cylinder whose pressure is adjusted by an electropneumatic regulator, a floating joint connected to the piston rod of the low friction cylinder, a load cell connected to the floating joint, and a squeegee bar connected to the load cell. and a squeegee holder and a squeegee attached to the squeegee bar. are arranged in optimum mutual positions and orientations, printing can be performed smoothly. Further, when changing the angle of the squeegee, the printing agent scooping mechanism moves integrally with the squeegee, so that the printing agent scooping mechanism does not get in the way when changing the angle of the squeegee.

Further, the squeegee is moved up and down very quickly from the position where the squeegee is lifted until it comes into contact with the screen mask, or just before that, by a vertical drive linear motor as the first lifting means, Since the squeegee comes into contact with the screen mask or is gently lowered from the position just before that by the squeegee elevating mechanism capable of adjusting the printing pressure as the second elevating means, the first elevating means of the squeegee is used. This makes it possible to perform a large up-and-down motion more quickly.

Also, the pressing force of the squeegee against the screen mask, that is, the printing pressure can be appropriately maintained during printing by the squeegee lifting mechanism capable of adjusting the printing pressure as the second lifting means.

Further, the print head section connected to the print head section rotation mechanism includes a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism for scooping the printing agent on the screen mask with a scraper. The printing agent scooping mechanism includes a spatula-shaped scraper facing the squeegee, a scraper opening/closing arm holding the scraper at the lower end, a pivot shaft serving as a fulcrum for pivoting the scraper opening/closing arm in the vertical direction, and the In the case of a squeegee mechanism in a screen printing machine, which is a printing agent scooping mechanism comprising a connecting rod that connects the upper end of a scraper opening/closing arm and a piston rod of a later-described cylinder, and a cylinder that rotates the scraper opening/closing arm. , the scraper can scrape off almost all of the residual solder paste after printing. Therefore, solder paste, which is an expensive printing agent, can be used without waste.

The print head unit connected to the print head unit rotation mechanism has a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism that scoops up the printing agent on the screen mask with a scraper. A print head section in which a print head section rotation mechanism connection plate is detachably connected to a print head section connection plate in the print head section rotation mechanism, and further, in the print head section rotation mechanism connection plate A pair of support plates vertically extending in parallel to the central portion in the longitudinal direction is provided with a central portion of a swing support rod that supports the squeegee elevating mechanism capable of adjusting the printing pressure and the printing material scooping mechanism. The squeegee and the screen are movably pivotally connected, and the squeegee and the screen are connected by push-down adjustment bolts whose both ends are provided at both side ends and whose tips are in contact with the print head rotation mechanism connecting plate. In the case of a squeegee mechanism in a screen printing machine that is adjusted to a position parallel to the mask and held, the print head rotation mechanism connection plate and the print head connection plate are superimposed on each other. Since the squeegee can be connected and separated easily, cleaning and replacement of the squeegee can be performed easily and quickly.

In addition, the squeegee elevating mechanism and the printing agent scooping mechanism that can adjust the printing pressure in the print head section are made to oscillate with the oscillating support rod, and the squeegee and the screen mask are adjusted to a position where the squeegee and the screen mask are parallel with the push-down adjustment bolt. Therefore, the printing pressure of the squeegee against the screen mask can be made uniform over the entire length.

Further, the connection between the print head rotation mechanism connection plate in the print head portion and the print head portion connection plate in the print head rotation mechanism is extended to the vicinity of both ends of the print head portion connection plate in the length direction. A long hole with a diameter is provided, and a shaft having an enlarged head is erected at the same position as the long hole provided in the print head portion connecting plate in the print head portion rotating mechanism connecting plate. In the case of a squeegee mechanism in a screen printing machine, in which the squeegee mechanism is connected by shifting it sideways after being inserted through the enlarged diameter portion of the elongated hole provided in the print head section connection plate, the print head section circuit This makes it possible to connect and disconnect the driving mechanism connecting plate and the print head portion connecting plate more easily and quickly.

FIG. 4 is a perspective view of the squeegee mechanism in the screen printer according to the embodiment of the present invention, viewed from the upper left, in a state in which the squeegee is moved in the front-rear direction. It is the perspective view seen from the upper right side of the same. It is the same front view. FIG. 4 is an enlarged view showing a partially cutaway connection portion between the print head rotation mechanism and the print head in FIG. 3 ; It is a right side view of the same. It is the same top view. 7 is an enlarged cross-sectional view taken along the line AA in FIG. 6; FIG. FIG. 4 is a perspective view of the squeegee mechanism in the screen printer according to the embodiment of the present invention, viewed from the upper left, in a state in which the squeegee is moved in the left-right direction. It is the perspective view seen from the upper right side of the same. It is the same front view. FIG. 4 is a perspective view of the squeegee mechanism of the screen printing machine according to the embodiment of the present invention, viewed from the upper right, in a state in which the squeegee moves obliquely. FIG. 4 is an explanatory diagram of the moving direction of the squeegee with respect to the screen mask in the present invention; FIG. 4 is a plan view of a screen mask in which the pattern consists only of pattern openings that are long in the front-rear direction with respect to the screen mask; 14 shows a difference in filling amount of the bonding paste due to a difference in moving direction of the squeegee with respect to the screen mask shown in FIG. 13. FIG. FIG. 3 is a plan view of a screen mask in which a pattern is formed by a combination of pattern openings that are long in the front-rear direction with respect to the screen mask and pattern openings that are long in the left-right direction with respect to the screen mask. FIG. 16 shows how the joining paste is filled into each pattern opening when the squeegee is obliquely moved with respect to the screen mask shown in FIG. 15 .

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated with reference to drawings.

In the drawing, reference numeral 1 denotes a front-rear drive linear motor arranged on a base (not shown) along the front-rear direction, and a slider 1a moves in the front-rear direction (Y-axis direction).

A linear guide 2 is arranged parallel to the longitudinal drive linear motor 1, and a slider 2a moves in the longitudinal direction (Y-axis direction).

A bridge member 3 bridges between the slider 1a of the longitudinal drive linear motor 1 and the slider 2a of the linear guide 2. As shown in FIG.

Reference numeral 4 denotes a left-right drive linear motor provided on the front vertical wall of the bridge member 3, for moving a slider 4a in the left-right direction (X-axis direction).

Reference numeral 5 denotes a vertical drive linear motor provided on the slider 4a of the horizontal drive linear motor 4, and the slider 5a moves in the vertical direction (Z-axis direction). The vertical drive linear motor 5 is attached to the slider 4a of the horizontal drive linear motor 4 via a support plate 6. As shown in FIG.

Reference numeral 7 denotes a vertical movement support plate attached to the slider 5a of the vertical drive linear motor 5. As shown in FIG.

A movable base 8 is horizontally attached to the lower end of the vertical movement support plate 7 .

Reference numeral 9 denotes a print head rotation mechanism provided on the moving base 8 for rotating the print head portion described later about an axis. The print head rotation mechanism 9 includes a rotation driving motor 10 vertically fixed to the moving base 8 and adjustable in rotation angle, and a reduction gear 11 and a coupling 12 for rotating the rotation driving motor 10 . It consists of a rotary shaft 13 connected to the shaft, and a print head section connecting plate 14 fixed to the lower end of the rotary shaft 13 . A cross roller bearing 15 supports the rotating shaft 13 .

A print head portion 16 is rotated about its axis by the print head portion rotating mechanism 9 . The print head unit 16 also includes a squeegee elevating mechanism 17 capable of adjusting the printing pressure, and a printing agent scooping mechanism (described later) that scoops up the printing agent on the screen mask with a scraper. and the printing agent scooping mechanism are supported by a later-described oscillating support rod via a later-described relay frame. The squeegee elevating mechanism 17 capable of adjusting the printing pressure includes a low-friction cylinder 18 whose pressure is adjusted by an electro-pneumatic regulator (not shown), a floating joint 19 connected to the piston rod of the low-friction cylinder 18, It comprises a load cell 20 connected to the floating joint 19, a squeegee bar 21 connected to the load cell 20, and a squeegee holder 22 and a squeegee 23 attached to the squeegee bar 21. Reference numerals 21a and 21a denote lift guide bodies for guiding the lift of the squeegee bar 21. As shown in FIG. Also, the low-friction cylinder 18 is vertically fixed to a relay frame, which will be described later.

Reference numeral 24 denotes a printing agent scooping mechanism comprising a spatula-shaped scraper 25 facing the squeegee 23, a scraper opening/closing arm 26 holding the scraper 25 at its lower end, and a fulcrum rotating the scraper opening/closing arm 26 in the vertical direction. a connecting rod 28 for connecting the upper end of the scraper opening/closing arm 26 and a piston rod of a cylinder described later; and a cylinder 29 for rotating the scraper opening/closing arm 26. The printing agent scooping mechanism 24 is provided on a scraper bar 31 connected to a piston rod of a cylinder 30 vertically fixed to the relay frame, which will be described later. Incidentally, the cylinder 29 is an air cylinder in this embodiment.

The printing agent scooping mechanism 24 operates as follows.
When the squeegee 23 is moving over the screen mask 38 and printing, the piston rod of the cylinder 29 extends to push the upper end of the scraper opening/closing arm 26 , and the scraper opening/closing arm 26 moves the pivot shaft 27 accordingly. It rotates as a fulcrum, and the scraper 25 and the squeegee 23 are separated and maintained in an open state. When the squeegee 23 moves on the screen mask 38 and reaches the printing end position, the piston rod of the cylinder 29 retracts and pulls the upper end of the scraper opening/closing arm 26, which causes the scraper opening/closing arm 26 to rotate. The scraper 25 rotates around the movable support shaft 27 as a fulcrum, and the scraper 25 approaches the squeegee 23 and closes. At this time, the printing agent on the screen mask 38 is scooped up and held between the scraper 25 and the squeegee 23 . In this state, the scraper 25 and the squeegee 23 are raised, returned to the original printing start position, and then lowered onto the screen mask 38 again. It opens. As a result, the printing agent is put on the screen mask 38 again, and printing by the squeegee 23 becomes possible. When the printing agent runs out, the printing agent is supplied by an appropriate printing agent supply mechanism (not shown).

Further, the print head section 16 has a print head rotation mechanism connection plate 32 provided at the upper end thereof, which is detachably connected to the print head section connection plate 14 of the print head rotation mechanism 9. The squeegee elevating mechanism 17 capable of adjusting the printing pressure and the printing agent scooping mechanism 17 are mounted on a pair of support plates 33, 33 which are vertically provided in parallel with the central portion of the printing head rotation mechanism connecting plate 32 in the longitudinal direction. The central portion of a rocking support rod 34 that supports the mechanism 24 is pivotally connected with a pivot shaft 35, and both ends 34a and 34b of the rocking support rod 34 are provided at both ends, The squeegee and the screen mask are adjusted to a position parallel to each other by push-down adjusting bolts 36, 36 whose tips are in contact with the printing head rotation mechanism connecting plate 32, and are held. A relay frame 37 holds the squeegee elevating mechanism 17 capable of adjusting the printing pressure and the printing agent scooping mechanism 24 and is supported by the swing support rod 34 .

Further, the connection between the print head rotation mechanism connection plate 32 and the print head connection plate 14 in the print head rotation mechanism 9 is arranged near both ends of the print head connection plate 14 in the longitudinal direction. An elongated hole 14a having an enlarged diameter 14a' on the side is provided, and a shaft having an enlarged head portion 32a' at the same position as the elongated hole 14a provided in the print head portion connecting plate 32 in the print head portion rotating mechanism connecting plate 32. The shaft 32a is erected, inserted through the enlarged diameter portion of the elongated hole 14a provided in the print head connecting plate 14, and then laterally displaced for connection.

In addition, reference numeral 38 in the figure denotes a screen mask, 39 denotes a screen mask holding frame, and 40 denotes a pattern formed on the screen mask 38. FIG.

Next, the operation of the above embodiment will be described.

First, the case of moving the squeegee in the front-rear direction (the Y-axis direction, the direction of A in FIG. 12) with respect to the screen mask will be described.

In this case, the sliders 1a and 2a of the longitudinal drive linear motor 1 and the linear guide 2 are positioned at one end in the moving direction, and the slider 4a of the lateral drive linear motor 4 is positioned at the center in the moving direction. Then, the print head unit 16 is rotated so that the squeegee 23 is orthogonal to the longitudinal drive linear motor 1, and the slider 5a of the vertical drive linear motor 5 is positioned at the lower end side in the moving direction. Then, the squeegee 23 of the squeegee elevating mechanism 17 capable of adjusting the printing pressure is brought into contact with the screen mask 38 . In this state, the longitudinal drive linear motor 1 is operated to move the squeegee 23 in the longitudinal direction (Y-axis direction) with respect to the screen mask 38 .

Next, a description will be given of a case where the squeegee is moved in the horizontal direction (X-axis direction, direction B in FIG. 12) with respect to the screen mask.

In this case, the sliders 1a and 2a of the longitudinal drive linear motor 1 and the linear guide 2 are positioned at the center in the moving direction, and the slider 4a of the lateral drive linear motor 4 is positioned at one end side in the moving direction. Then, the print head unit 16 is rotated so that the squeegee 23 is orthogonal to the horizontal drive linear motor 4, and the slider 5a of the vertical drive linear motor 5 is positioned at the lower end side in the moving direction. Then, the squeegee 23 of the squeegee elevating mechanism 17 capable of adjusting the printing pressure is brought into contact with the screen mask 38 . In this state, the horizontal drive linear motor 4 is operated to move the squeegee 23 in the horizontal direction (X-axis direction) with respect to the screen mask 38 .

Next, the case of moving the squeegee in an oblique direction (direction c in FIG. 12) with respect to the screen mask will be described.

In this case, the sliders 1a and 2a of the longitudinal drive linear motor 1 and the linear guide 2 are positioned at one end in the movement direction, and the slider 4a of the lateral drive linear motor 4 is positioned at one end in the movement direction. Then, the print head unit 16 is rotated so that the squeegee 23 faces the intermediate direction between the Y axis and the X axis, and the slider 5a of the vertical drive linear motor 5 is positioned at the lower end side in the movement direction. Then, the squeegee 23 of the squeegee elevating mechanism 17 capable of adjusting the printing pressure is brought into contact with the screen mask 38 . In this state, the longitudinal drive linear motor 1 and the lateral drive linear motor 4 are simultaneously operated to move the squeegee 23 obliquely with respect to the screen mask 38 .

Next, a description will be given of a case where the squeegee is obliquely moved with respect to the screen mask in the front-rear direction (direction D in FIG. 12).

In this case, the sliders 1a and 2a of the longitudinal drive linear motor 1 and the linear guide 2 are positioned at one end in the moving direction, and the slider 4a of the lateral drive linear motor 4 is positioned at the center in the moving direction. Then, the print head unit 16 is rotated so that the squeegee 23 faces the intermediate direction between the Y axis and the X axis, and the slider 5a of the vertical drive linear motor 5 is positioned at the lower end side in the movement direction. Then, the squeegee 23 of the squeegee elevating mechanism 17 capable of adjusting the printing pressure is brought into contact with the screen mask 38 . In this state, the longitudinal drive linear motor 1 is operated to move the squeegee 23 in the longitudinal direction (Y-axis direction) with respect to the screen mask 38 .

Next, a description will be given of a case where the squeegee is obliquely moved with respect to the screen mask in the horizontal direction (direction E in FIG. 12).

In this case, the sliders 1a and 2a of the longitudinal drive linear motor 1 and the linear guide 2 are positioned at the center in the moving direction, and the slider 4a of the lateral drive linear motor 4 is positioned at one end side in the moving direction. Then, the print head unit 16 is rotated so that the squeegee 23 faces the intermediate direction between the Y axis and the X axis, and the slider 5a of the vertical drive linear motor 5 is positioned at the lower end side in the moving direction. Then, the squeegee 23 of the squeegee elevating mechanism 17 capable of adjusting the printing pressure is brought into contact with the screen mask 38 . In this state, the horizontal drive linear motor 4 is operated to move the squeegee 23 in the horizontal direction (X-axis direction) with respect to the screen mask 38 .

Since the present embodiment is configured as described above, the squeegee can be moved in the front-rear, left-right, and oblique directions with respect to the screen mask, and the squeegee can be obliquely moved in the front-rear and left-right directions with respect to the screen mask. It will also be possible to move to Therefore, in addition to the case where the shape of the pattern formed on the screen mask consists only of pattern openings that are long in the front-back direction or the left-right direction with respect to the screen mask, pattern openings that are long in the front-back direction with respect to the screen mask and screen Even in the case of combination with pattern openings that are long in the left-right direction with respect to the mask, a single unit can sufficiently cope with the case.

The print head rotation mechanism 9 is attached to a rotation driving motor 10 vertically fixed to the moving base 8 and capable of adjusting the rotation angle. Since the print head rotating mechanism is formed of the connected rotating shaft 13 and the print head connecting plate 14 fixed to the lower end of the rotating shaft 13, the print head 16 is rotated around the axis by the motor. It can be done automatically. Therefore, the rotation angle of the print head can be changed quickly without stopping the operation of the machine. In addition, it is possible to accurately set the rotation angle.

The print head unit 16 connected to the print head unit rotating mechanism 9 is provided with a squeegee elevating mechanism 17 capable of adjusting the printing pressure, and a printing agent scooping mechanism 24 that scoops up the printing agent on the screen mask with a scraper. a low-friction cylinder 18 whose pressure is adjusted by an electro-pneumatic regulator (not shown); a floating joint 19 connected to the piston rod of the low-friction cylinder 18; A squeegee elevating mechanism capable of adjusting the printing pressure is provided, comprising a load cell 20 connected to a floating joint 19, a squeegee bar 21 connected to the load cell 20, and a squeegee holder 22 and a squeegee 23 attached to the squeegee bar 21. By providing the squeegee elevating mechanism 17 and the printing agent scooping mechanism 24 together at optimum mutual positions and directions, printing can be performed smoothly. Further, when changing the angle of the squeegee, the printing agent scooping mechanism 24 moves integrally with the squeegee, so the printing agent scooping mechanism 24 does not interfere with changing the angle of the squeegee.

Further, the squeegee 23 is moved up and down from the raised position until the squeegee 23 comes into contact with the screen mask 38, or the squeegee 23 moves up and down very quickly until it touches the screen mask 38 or just before that. 5, and the squeegee 23 comes into contact with the screen mask 38 or gently descends from the position just before that, by the squeegee lifting mechanism 17 capable of adjusting the printing pressure as the second lifting means. It is possible to perform a large lifting operation of the squeegee by the first lifting means more quickly.

Further, the pressing force of the squeegee 23 against the screen mask 38, that is, the printing pressure can be appropriately maintained during printing by the squeegee lifting mechanism 17 capable of adjusting the printing pressure as the second lifting means.

The printing agent scooping mechanism 24 is composed of a spatula-shaped scraper 25 facing the squeegee 23, a scraper opening/closing arm 26 holding the scraper 25 at the lower end, and a fulcrum for rotating the scraper opening/closing arm 26 in the vertical direction. a connecting rod 28 that connects the upper end of the scraper opening/closing arm 26 and the piston rod of the cylinder described later; and a cylinder 29 that rotates the scraper opening/closing arm 26. Because of the mechanism, the scraper 25 can scrape off almost all of the residual solder paste after printing. Therefore, solder paste, which is an expensive printing agent, can be used without waste.

The print head portion 16 is formed by detachably connecting a print head rotation mechanism connection plate 32 provided at the upper end to the print head portion connection plate 14 of the print head rotation mechanism 9 . Furthermore, the squeegee elevating mechanism 17 capable of adjusting the printing pressure and the printing pressure adjustable squeegee elevating mechanism 17 are attached to a pair of supporting plates 33, 33 vertically provided downward in parallel with the central portion of the print head rotation mechanism connecting plate 32 in the longitudinal direction. The central portion of a rocking support rod 34 that supports the medicine scooping mechanism 24 is pivotally connected by a pivot 35, and both ends 34a and 34b of the rocking support rod 34 are connected to both ends thereof. The squeegee 23 and the screen mask 38 are adjusted to a position parallel to each other by push-down adjusting bolts 36, 36 whose tips are in contact with the printing head rotation mechanism connecting plate 32, and are held. The print head rotating mechanism connecting plate 32 and the print head connecting plate 14 can be connected in a superimposed state, and can be easily separated. Therefore, cleaning and replacement of the squeegee can be performed easily and quickly.

The squeegee elevating mechanism 17 and the printing agent scooping mechanism 24 which can adjust the printing pressure in the print head section 16 are made to swing by a swing support rod 34, and the squeegee 23 and the screen mask are moved by push-down adjusting bolts 36, 36. 38 can be adjusted so that the printing pressure of the squeegee 23 against the screen mask 38 can be made uniform over the entire length.

Also, the connection between the print head rotation mechanism connection plate 32 in the print head portion 16 and the print head rotation mechanism connection plate 14 in the print head rotation mechanism 9 is positioned near both ends of the print head connection plate 14 in the length direction. In addition, an elongated hole 14a having an enlarged diameter 14a' at one end is provided, and an enlarged head portion 32a' is provided in the print head rotating mechanism connecting plate 32 at the same position as the elongated hole 14a provided in the print head connecting plate 14. is erected, and the shaft 32a is inserted through the enlarged diameter portion of the elongated hole 14a provided in the print head portion connecting plate 14, and then laterally shifted to connect the shaft 32a. Therefore, it is possible to connect and disconnect the print head rotation mechanism connecting plate 32 and the print head connecting plate 14 more easily and quickly.

1 Front-rear drive linear motor 1a Front-rear drive linear motor slider 2 Linear guide 2a Linear guide slider 3 Bridge member 4 Left-right drive linear motor 4a Left-right drive linear motor slider 5 Vertical drive linear motor 5a Vertical drive linear motor slider 6 Support plate 7 vertical movement support plate 8 movement base 9 print head rotation mechanism 10 rotary drive motor 13 rotary shaft 14 print head connection plate 14a connection long hole 16 print head 17 squeegee elevating mechanism capable of adjusting printing pressure 18 low friction cylinder 19 Floating joint 20 Load cell 21 Squeegee bar 22 Squeegee holder 23 Squeegee 24 Printing material scooping mechanism 25 Scraper 26 Scraper opening/closing arm 27 Rotation support shaft 28 Connection rod 29 Cylinder 30 Cylinder 31 Scraper bar 32 Print head rotation mechanism connection plate 32a Connection Shafts 33, 33 Pair of bearing plates 34 Swing bearing rod 35 Pivot shafts 36, 36 Push-down adjustment bolts 38 Screen mask 39 Screen mask holding frame 40 Pattern formed on the screen mask

Claims (5)

A front-rear drive linear motor and a linear guide for moving a slider in the front-rear direction are arranged in parallel on a base, and a bridge member bridging between the front-rear drive linear motor and the slider of the linear guide moves the slider in the left-right direction. further, a slider of the horizontal drive linear motor is provided with a vertical drive linear motor for moving the slider in the vertical direction; a vertical movement support plate is attached to the slider of the vertical drive linear motor; Screen printing in which a horizontal movement base is attached to the lower end of a vertical movement support plate, and a printing head section rotating mechanism for rotating a printing head section equipped with a squeegee holder, a squeegee, etc. around an axis is provided on the moving base. A squeegee mechanism in a printer, wherein the print head rotation mechanism comprises a rotary drive motor fixed vertically to a movement base and capable of adjusting a rotary angle, and a rotation shaft of the rotary drive motor via a speed reducer and a coupling. A squeegee mechanism in a screen printing machine, which is a print head section rotating mechanism comprising a rotary shaft connected to the rotary shaft and a print head section connecting plate fixed to the lower end of the rotary shaft. The print head section connected to the print head section rotation mechanism includes a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism for scooping the printing agent on the screen mask with a scraper. An adjustable squeegee elevating mechanism comprises a low-friction cylinder whose pressure is adjusted by an electro-pneumatic regulator, a floating joint connected to the piston rod of the low-friction cylinder, a load cell connected to the floating joint, and a squeegee bar connected to the load cell. 2. A squeegee mechanism for a screen printing machine according to claim 1, wherein said squeegee elevating mechanism comprises a squeegee holder and a squeegee attached to said squeegee bar and capable of adjusting printing pressure. The print head unit connected to the print head unit rotation mechanism includes a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism for scooping the printing agent on the screen mask with a scraper, and the printing agent. The scooping mechanism includes a spatula-shaped scraper facing the squeegee, a scraper opening/closing arm holding the scraper at the lower end, a pivot shaft serving as a fulcrum for vertically rotating the scraper opening/closing arm, and the scraper opening/closing. 2. A squeegee mechanism in a screen printing machine according to claim 1, wherein said squeegee mechanism is a printing agent scooping mechanism comprising a connecting rod for connecting the upper end of said arm and said piston rod of said cylinder, and said cylinder for rotating said scraper opening/closing arm. The print head unit connected to the print head unit rotation mechanism has a squeegee elevating mechanism capable of adjusting the printing pressure, and a printing agent scooping mechanism that scoops up the printing agent on the screen mask with a scraper. A print head section in which a print head section rotation mechanism connection plate is detachably connected to a print head section connection plate in the print head section rotation mechanism, and further, in the print head section rotation mechanism connection plate A pair of support plates vertically extending in parallel to the central portion in the longitudinal direction is provided with a central portion of a swing support rod that supports the squeegee elevating mechanism capable of adjusting the printing pressure and the printing material scooping mechanism. The squeegee and the screen are movably pivotally connected, and the squeegee and the screen are connected by push-down adjustment bolts whose both ends are provided at both side ends and whose tips are in contact with the print head rotation mechanism connecting plate. 2. A squeegee mechanism for a screen printer according to claim 1, wherein the squeegee mechanism is adjusted to a position parallel to the mask and held. The connection between the print head rotation mechanism connection plate in the print head portion and the print head portion connection plate in the print head rotation mechanism is expanded near both ends in the length direction of the print head portion connection plate. A long hole is provided, and a shaft having an enlarged head is erected at the same position as the long hole provided in the print head section connection plate in the print head section rotation mechanism connection plate, and the shaft is used for the printing. 5. A squeegee mechanism for a screen printing machine according to claim 4, wherein the squeegee mechanism is connected by shifting it laterally after being inserted through the enlarged diameter portion of the elongated hole provided in the head portion connecting plate.

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