JPH0718839U - Screen printing machine - Google Patents

Abstract

(57) [Summary] [Purpose] The squeegee's bottom edge position for the squeegee to be pressed in advance during printing operation can be quickly moved and set so that the printing pressure on the workpiece through the screen printing plate can be adjusted. [Configuration] The squeegee mechanism 10 of the squeegee unit 5,
A push-up / down moving mechanism 21 for moving the squeegee 17 up and down set in advance at a push-in height position, and a push-in amount adjusting device having a detection control means 31 for detecting the lower end edge position of the squeegee 17 and regulating and controlling the vertical moving interval of the squeegee 17. 20 is provided.
The pushing up / down moving mechanism 21 vertically moves the adjusting block 25, which is driven by a stepping motor 23 by a screw feeding operation, in the adjusting pipe 22 and moves the position of the squeegee 17 up and down via a squeegee joint plate 27 at the lower end of the adjusting block 25. To configure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention makes it possible to constantly press the squeegee at a constant amount when printing on a screen printing plate, regardless of whether the squeegee is upright or tilted when screen printing is performed by a squeegee that descends and rubs against the screen printing plate. The present invention relates to a screen printing machine capable of automatically adjusting and setting the height position of a squeegee before lowering and lowering operations so that the screen can be maintained.

[0002]

[Prior art]

 Conventionally, in this type of screen printing machine, an object to be printed set on a printing table is printed by a squeegee that slides down onto the upper surface of the screen printing plate held above it. After the printing operation, the squeegee is raised and retracted, while the lowered doctor is rubbed against the upper surface of the screen printing plate to perform ink leveling (ink return).

In connection with the lifting operation of the squeegee performed at this time, the printing pressure on the printing material is set by setting the printing pressure depending on the pushing amount of the squeegee when it is moved down and rubs against the upper surface of the screen printing plate. Since it is necessary to perform uniform print application from the start position to the print end position, if the lifting range is constant, the initial squeegee height position set before the lowering operation is always adjusted to a constant position. Must be set.

[0004]

[Problems to be solved by the device]

 However, in the conventional screen printing machine, since the lower edge of the squeegee is gradually worn away when the upper surface of the screen printing plate is rubbed, the amount of pushing in is reduced with repeated printing operations. In addition, when the squeegee is upright or inclined due to press printing, drawing printing, etc. during printing application, the lower edge position of the squeegee naturally differs.

Therefore, conventionally, the adjustment of the pressing amount of the squeegee is such that the distance from the screen for printing the screen is directly measured on a scale and the lower edge position of the squeegee is set by operating the adjustment handle or the like. Not only is it extremely troublesome due to the manual work, but the uniformity cannot be guaranteed because the operator's perception must be relied on to some extent. Also, when measuring and adjusting this with a position sensor, etc., since the squeegee itself is long in the left-right direction, the measurement at that one point is not reliable, so it is necessary to measure multiple points. The arrangement and configuration of was complicated.

Therefore, the present invention has been devised in view of various existing conditions as described above, and the squeegee before and after being moved up and down so as to have a predetermined pushing amount by the squeegee at the time of printing operation. The lower edge position can be quickly set up and down, and it can be set accurately regardless of whether the squeegee is in the upright state or the inclined state, and the printing pressure by the squeegee pushing amount against the printing material through the screen printing plate is set. It is an object of the present invention to provide a screen printing machine capable of finely adjusting and adjusting the left and right balances.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, the screen printing plate S arranged on the printing material (W) is turned upside down and reciprocally turned up and down during printing. The squeegee unit 5 having a squeegee mechanism 10 having a squeegee 17 that rubs against the screen printing plate S and a doctor mechanism 18 having a doctor 19 that runs downward when leveling the ink. In the squeegee mechanism 10 in which printing is applied, a squeegee vertically moving mechanism 21 for vertically moving a squeegee 17, which is vertically set at a predetermined height position, and a lower edge position of the squeegee 17 are detected. Therefore, the squeegee 17 is characterized by being provided with the pushing amount adjusting device 20 having the detection control means 31 for regulating and controlling the advance vertical movement interval of the squeegee 17.

The pushing up / down moving mechanism 21 fixes a stepping motor 23 on an upper portion of an adjusting pipe 22 fixed to a squeegee joint block 13 of the squeegee mechanism 10, and a squeegee adjusting bolt 24 connected to a motor shaft of the stepping motor 23. The squeegee holder that holds the squeegee 17 in the adjust block 25 protruding from the lower end of the adjust pipe 22 is engaged with the adjust ball screw 26 that is connected to the adjust block 25 that slidably moves up and down in the adjust pipe 22. It can be configured by connecting the squeegee joint plates 27 that connect the sixteen.

The detection control means 31 has a pair of transmissive photoelectric sensors 32, one of which is a light projecting portion and the other of which is a light receiving portion, and which is provided either before or after either side of the traveling direction of the squeegee unit 5. The squeegee unit 5 is provided with either one of the light emitting / receiving unit and the other of the front and rear of the other side, or the other of the light emitting / receiving unit on the other side. The detection path F can be formed so as to be formed, and the height position of the light detection path F can be set to the lower edge position of the squeegee unit 5.

[0010]

[Action]

 In the screen printing machine according to the present invention, the squeegee unit 5 before the printing operation sets a predetermined position within the traveling range of the squeegee unit 5 in order to set the height position of the squeegee 17 of the squeegee mechanism 10 before the descent. When the squeegee 17 is in a stopped state, the squeegee 17 is previously adjusted by moving the squeegee 17 up and down.

The pushing up / down moving mechanism 21 guides and moves up and down the adjusting block 25 in the adjusting pipe 22 by the screw feeding action accompanying the driving of the stepping motor 23, and the squeegee joint plate 27 at the lower end of the adjusting block 25 is used. Move the squeegee 17 position up and down.

When the squeegee 17 moved up and down by the pushing up / down moving mechanism 21 reaches the position of the light detection path F formed by the detection control means 31, the lower edge position of the squeegee 17 is detected. The vertical movement of the pushing vertical movement mechanism 21 is stopped, and the squeegee 17 is set at a predetermined pushing height position.

When the squeegee 17 set at a predetermined pushing height position travels while the squeegee unit 5 itself travels while maintaining the height position, the detection control means formed obliquely to the traveling direction. The light detection path F of 31 detects the height from the central position of the squeegee 17 to the edge on either the left or right side as the squeegee unit 5 runs.

[0014]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 indicates, for example, that a work W such as a printed circuit board, which is an object to be printed, is put in, and printing coating such as liquid photoresist is applied. It is a printing device in a screen printing machine designed to be performed. The printing apparatus 1 travels on, for example, a printing table 3 supported on an upper part of a column frame 2 standing upright at four corners, and a screen printing plate S surface set on the printing table 3 via a printing plate support mechanism 4. A squeegee unit 5 having a squeegee 17 and a doctor 19 is provided, and the screen printing plate S is held and fixed at a predetermined position above the printing table 3. When the squeegee unit 5 travels back and forth, the squeegee 17 descends during the forward travel and rubs against the upper surface of the screen printing plate S to print and apply ink such as liquid photoresist to the work W on the printing table 3. In addition, at the time of returning, the doctor 19 descends and rubs against the upper surface of the screen printing plate S to perform ink leveling (ink return) to make the ink that has been displaced even.

The squeegee unit 5 is mounted on the right and left squeegee base members 6 mounted between the front and rear of the left and right pillar frames 2 and mounted so as to be integrated with each other along the squeegee base members 6. Right and left squeegee block members 8 connected by the center pipe 7, a squeegee mechanism 10 mounted between the squeegee block members 8 and moved up and down by an elevating means 11, and a doctor mechanism 18 also mounted and moved up and down, The squeegee 17 of the squeegee mechanism 10 and the doctor 19 of the doctor mechanism 18 are provided with a control means (not shown) for vertically inverting and raising and lowering the squeegee block member 8 as the squeegee block member 8 reciprocates. The squeegee unit 5 itself is lifted and lowered at a predetermined squeegee lift interval L (see FIG. 2) by the operation of the squeegee lift cylinder 9, and the squeegee unit 5 is raised and retracted before the printing operation. 10. When the doctor mechanism 18 is held in the neutral position and lowered in the printing operation, the squeegee 17 of the squeegee mechanism 10 set in the lowered position rubs and prints on the upper surface of the screen printing plate S, On the contrary, the doctor 19 of the doctor mechanism 18 set to the lowered position rubs the upper surface of the screen printing plate S to level the ink. Then, the squeegee 17 of the squeegee unit 5 corresponds to the squeegee lift interval L when the squeegee lift cylinder 9 of the squeegee unit 5 moves up and down so as to face the upper surface of the work W by the pushing amount adjusting device 20 in the ascending / retracting position. Then, it is adjusted and positioned at a predetermined pushing height position set at a predetermined interval. That is, the squeegee mechanism 10 is provided with a pushing amount adjusting device 20 that adjusts and positions the initial pushing set height of the squeegee 17, and the squeegee 17 is raised and lowered through the raising and lowering means 11 according to a control instruction from the control means, and the screen is moved. The pressing amount when rubbing on the S surface of the printing plate can be adjusted in advance.

The squeegee base member 6 is a plate-shaped member, and is guided by guide means laid on the upper surface of the squeegee base member 6, so that the right and left squeegee block members 8 run forward and backward by appropriate driving means. To be done. Further, a square pipe-shaped sensor support member 6A is fixedly arranged on the lower surface of the squeegee base member 6 to accommodate a photoelectric sensor 32 described later.

As shown in FIG. 5, the squeegee mechanism 10 has a squeegee joint block 13 that is moved up and down between the left and right squeegee block members 8 via an elevating means 11 associated with the squeegee block members 8. It is provided by mounting the pipe-shaped squeegee holder 16. By pushing the squeegee holder 16 up and down by the pushing amount adjusting device 20 associated with the squeegee joint block 13, the lower end edge position of the squeegee 17 attached to the squeegee holder 16 is initialized. Further, the elevating means 11 guides the cylinder rod of the switching elevating cylinder 12 fixed to the squeegee carriage plate 15 linked to the squeegee block member 8 in the vertical direction by the guide member 14 formed on the squeegee carriage plate 15. The squeegee joint block 13 is connected to the squeegee joint block 13 via a floating joint, and the squeegee holder 16 is mounted between the pushing amount adjusting devices 20 attached to the left and right squeegee joint blocks 13.

As shown in FIGS. 1 and 4 to 6, the pushing amount adjusting device 20 includes a pushing vertical movement mechanism 21 for vertically moving a squeegee 17 which is vertically set to a pushing height position, and a squeegee 17. The squeegee unit 5 has a detection control means 31 for controlling the advance vertical movement interval of the squeegee 17 by detecting the lower edge position, and further travels the squeegee unit 5 back and forth in association with the detection operation by the detection control mechanism 31. It is provided with a traveling control means.

As shown in FIGS. 5 and 6, the pushing up / down moving mechanism 21 fixes the stepping motor 23 on the upper portion of the adjusting pipe 22 fixed to the squeegee joint block 13, and connects the stepping motor 23 to the motor shaft of the stepping motor 23. A squeegee holder is attached to the adjusting block 25 protruding from the lower end of the adjusting pipe 22 by engaging the adjusting ball screw 26 to which the adjusting block 25 that slidably moves up and down in the adjusting pipe 22 is connected to the squeegee adjusting bolt 24. 16 is formed by connecting squeegee joint plates 27 that connect 16 to each other. The stepping motor 23 in the pushing up / down moving mechanism 21 is driven by moving the adjusting block 25 up and down via the adjusting ball screw 26 as the squeegee adjusting bolt 24 is rotated. The squeegee holder 16 connected through the plate 27 and a squeegee angle adjusting mechanism 35 described later is also moved up and down. Further, the pushing up / down moving range of the adjusting block 25 in the pushing up / down moving mechanism 21 is detected and regulated by the upper and lower limit sensors 28 arranged at the upper and lower limit positions, respectively.

As shown in FIGS. 1 to 3, the detection control means 31 includes a pair of transmissive photoelectric sensors 32, one of which is a light emitting portion and the other of which is a light receiving portion. The squeegee unit is equipped with either one of the light emitter / receiver unit on the front or back of one of the two sides, and the other of the light emitter / receiver on the other of the other front / rear side of the other side. 5 is arranged so as to form a light detection path F that is oblique to the traveling direction of 5, and the height position of the light detection path F is set at the lower edge position of the squeegee unit 5. Further, as shown in the drawing, the light projecting portion and the light receiving portion of the photoelectric sensor 32 itself are provided inside the sensor supporting member 6A fixedly arranged on the lower surface of the squeegee base member 6 by forming a light hole portion therein. The projection unit is disposed on the rear side of the printing apparatus 1 and the light receiving unit is disposed on the front side of the printing apparatus 1 to form a pair on the left and right sides. Incidentally, reference numeral 33 in the figure is an optical fiber.

In the photoelectric sensor 32, when the light detection is turned off, the operation of the pushing up / down moving mechanism 21 is stopped, and it is oblique to the traveling direction of the squeegee unit 5. By the set light detection path F, it is possible to detect any position of the lower edge of the squeegee 17 as the squeegee unit 5 travels. Further, the vertical movement by the pushing vertical movement mechanism 21 is adjusted and controlled so as to have an arbitrary pushing amount by positioning the lower edge of the squeegee 17 above and below the light detection path F.

The traveling control means is configured to reciprocate on at least one of the front and rear sides of the center position of the traveling range, which is the origin position of the squeegee unit 5, and return to the origin position again. 21, in association with the detection operation by the detection control means 31, it is preprogrammed and incorporated into the traveling drive mechanism of the squeegee unit 5. Then, after the adjustment setting of the pushing-in height position of the squeegee 17 at the origin position is completed, the running control means causes the squeegee unit 5 to run in parallel at a predetermined height position with respect to the upper surface of the screen printing plate S. The detection control means 31 detects whether or not the lower edge of the squeegee 17 moves vertically during the leveling operation. Further, when the return to the origin position is made after the detection of the presence / absence of the up / down movement during traveling as described above, the left and right pushing up / down moving mechanisms 21 respectively move up and down a proper number of times at the origin position to perform the detection control. The lower end edge of the squeegee 17 is set at a predetermined pushing height position where the left and right balances are corrected together with the detection operation of the means 31.

Further, as shown in the drawing, a squeegee angle adjusting mechanism 35 for tilting the squeegee 17 at an arbitrary angle along the traveling direction thereof is provided, and the squeegee joint plate 27 and the squeegee holder 16 at the left and right are provided. It is installed between and. As shown in FIGS. 7 and 8, the squeegee angle adjusting mechanism 35 is rotatably supported by an adjust base 36 fixed to the squeegee joint plate 27, and the squeegee holder 16 is fixed to the worm wheel. 37 and the worm gear 39 linked to the motor shaft of the stepping motor 38 fixedly supported by the adjust base 36 (see FIG. 7), while floating on the cylinder rod of the regulation cylinder 41 fixedly supported by the adjust base 36. A regulation rack 43, which is connected via a joint and guided and slid by a guide member 42, is engaged with the worm wheel 37 (see FIG. 8). Here, the stepping motor 38 is rotationally driven by rotating the worm wheel 37 through the worm gear 39 to rock the squeegee holder 16 and set the inclination angle of the squeegee 17. Further, the rocking operation of the squeegee holder 16 is controlled and held by the cylinder pressure of the restricting cylinder 41 that restricts the movement of the restricting rack 43 that meshes with the worm wheel 37. The screen printing plate S, the work W, etc. during the printing operation. The inclination angle of the squeegee 17 is kept constant against the friction resistance due to.

As shown in the drawing, one of the left and right worm wheels 37 arranged at both ends of the squeegee holder 16 is engaged with the worm gear 39, and the other is engaged with the restriction rack 43, whereby either of the squeegee holder 16 is engaged. One side gives an instruction to set the rocking angle, and the other one tries to maintain the rocking angle, thereby simplifying the overall configuration. Further, when the inclination angle of the squeegee 17 is arbitrarily set by the squeegee angle adjusting mechanism 35, the pushing amount adjusting device 20 is associated so as to be actuated correspondingly, and both are driven by a motor. Therefore, the numerical control setting by the parameter is made easy. In particular, since the inclination angle of the squeegee 17 can be numerically controlled by electrification by the stepping motor 38, the adjustment setting can be simplified, which can be greatly useful for shortening the work setup time.

Next, an example of the operation of the screen printing machine of the present invention will be described. Since the printing application and the ink leveling are alternately performed by the reciprocating movement of the squeegee unit 5, the application is performed before the printing application operation. The pushing amount adjusting device 20 is operated and controlled according to the printing pressure by the pushing amount of the squeegee 17 with respect to the workpiece W to set the pushing lower edge position of the squeegee 17. At this time, when the squeegee 17 is set to a predetermined tilt angle by the squeegee angle adjusting mechanism 35, and when the initial lower end edge position of the squeegee 17 is at the upper position due to wear or the like, the stepping motor 23 is rotated. The squeegee 17 is moved downward by driving. When the squeegee 17 is in the upright state and the bottom edge position is in the lower position, the squeegee 17 is moved upward by the rotational driving of the stepping motor 23.

The adjustment control of the pushing bottom edge position of the squeegee 17 by the pushing amount adjusting device 20 is performed programmatically by operating an origin position return switch (not shown), and the squeegee unit 5 prints. It is performed after the vehicle has returned to the origin position, which is almost the center of the position. That is, when the squeegee unit 5 returns to the origin position, the squeegee 17 is moved up and down by the vertical movement of the pushing up / down moving mechanism 21 to the light detection path F position where the detection control means 31 projects the light in the pushing amount adjusting device 20. When the squeegee 17 reaches the light detection path F when the squeegee 17 moves up and down and is aligned, the squeegee 17 stops its up and down movement. Next, with the squeegee 17 still held at the same height position, the squeegee unit 5 travels from the origin position in either the forward or rearward traveling direction, and the optical detection path is oblique to the traveling direction. The pushing height position is detected by F to reach the right and left edges of the squeegee 17. After that, in the squeegee unit 5 after returning to the origin position, the height positions of the left and right portions of the squeegee 17 which are individually moved up and down by the operation of the left and right pushing up / down moving mechanisms 21 in the pushing amount adjusting device 20 are detected. The indentation height position of the entire squeegee 17 which is controlled and the left-right balance is corrected is adjusted.

In this way, when the pushing lower edge position of the squeegee 17 is adjusted, the squeegee 17 of the squeegee mechanism 10 lowered by the lifting means 11 is moved while the squeegee unit 5 lowered by the squeegee lift cylinder 9 is running. By rubbing the upper surface of the screen printing plate S, the work W put on the printing table 3 is printed and applied through the screen printing plate S to form a predetermined print pattern on the work W. To be done. At this time, even if the squeegee lift cylinder 9 has a certain range of vertical movement intervals, the print application is performed by the squeegee 17 in which the printing pressure is set by a predetermined pressing amount by adjusting and positioning the lower end edge position of the pressing in advance. Of.

[0028]

[Effect of device]

 The present invention is configured as described above, and therefore, the lower end edge position of the squeegee 17 to be pushed in advance before the printing operation by the squeegee unit 5 can be quickly set up and down by the pushing amount adjusting device 20, and This can be performed accurately regardless of whether the squeegee 17 is in the upright state or the inclined state, and the printing pressure can be adjusted and set by a predetermined pressing amount with respect to the work W through the screen printing plate S. .

That is, the squeegee mechanism 10 of the squeegee unit 5 detects the vertical movement mechanism 21 for vertically moving the squeegee 17, which is set up and down at a predetermined height position, and the lower edge position of the squeegee 17. This is because the squeegee 17 is provided with the indentation amount adjusting device 20 having the detection control means 31 that regulates the indentation vertical movement interval of the squeegee 17 in advance. This is because the push-in height position for pressure adjustment can be adjusted to an appropriate one, or to an arbitrary one that sets the strength as needed.

In addition, the pushing up / down moving mechanism 21 is arranged such that the adjusting block 25 in the adjusting pipe 22 is driven by the screw feeding action of both the squeegee adjusting bolt 24 and the adjusting ball screw 26 which are meshed with each other as the stepping motor 23 is driven. The squeegee 17 can be moved up and down with a squeegee joint plate 27 at the lower end of the adjusting block 25, so that the squeegee 17 can be moved up and down very smoothly and at a predetermined pushing height position. It not only makes the detection of the printing speed quick, but also facilitates the management by digitizing it and makes it possible to control the printing pressure at a constant level at all times.

Moreover, when the lower edge position is vertically moved when the squeegee angle adjusting mechanism 35 arbitrarily adjusts the inclination angle of the squeegee 17, the pushing amount adjusting device 20 adjusts this so that the pushing amount becomes an appropriate pushing amount. Therefore, the work can be speeded up, and an appropriate printing pressure can be realized by controlling the numerical setting arbitrarily.

Since the detection control means 31 forms the light detection path F by the transmissive photoelectric sensor 32 obliquely to the traveling direction of the squeegee unit 5, for example, the central position of the traveling range of the squeegee unit 5 When there is a squeegee 17 in the squeegee 17, even if the height at the center position of the squeegee 17 is detected, when the squeegee unit 5 runs, the height from the center position of the squeegee 17 to one of the left and right edges. The detection accuracy can be remarkably improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view of an embodiment of the present invention.

FIG. 2 is a front sectional view of the same.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a partially cutaway plan view of a main part of the squeegee unit.

FIG. 5 is a partially cutaway front view of a main part of the squeegee unit.

FIG. 6 is a cross-sectional view of a pushing vertical movement mechanism in the pushing amount adjusting device.

FIG. 7 is a side view of the squeegee angle adjusting mechanism on the angle adjustment drive side.

FIG. 8 is a side view of an angle adjustment holding side in the squeegee angle adjustment mechanism.

[Explanation of symbols]

F Light detection path L Squeegee lift interval S Screen printing plate W Work 1 Printing device 2 Strut frame 3 Printing table 4 Printing plate support mechanism 5 Squeegee unit 6 Squeegee base member 6A Sensor support member 7 Center pipe 8 Squeegee block material 9 Squeegee lift cylinder 10 Squeegee mechanism 11 Elevating means 12 Switching elevating cylinder 13 Squeegee joint block 14 Guide member 15 Squeegee carriage plate 16 Squeegee holder 17 Squeegee 18 Doctor mechanism 19 Doctor 20 Push amount adjustment device 21 Push up / down moving mechanism 22 Adjust pipe 23 Stepping motor 24 Squeeze adjust bolt 25 Adjust Block 26 Adjust Ball Screw 27 Squeegee Joint Plate 28 Upper and Lower Limit Sensor 31 Inspection Output control means 32 Photoelectric sensor 33 Optical fiber 35 Squeegee angle adjusting mechanism 36 Adjust base 37 Worm wheel 38 Stepping motor 39 Worm gear 41 Control cylinder 42 Guide member 43 Control rack

Claims (3)

[Scope of utility model registration request] 1. A squeegee mechanism having squeegees, which are turned upside down in relation to reciprocating movement on a screen printing plate arranged on a material to be printed, and are lowered during printing to rub against the screen printing plate. In a screen printing machine in which a squeegee unit having a doctor mechanism having a doctor that runs downward when leveling ink is used to perform print coating on the surface of a printed material, the squeegee mechanism is set up and down at a predetermined height position. A squeegee up-and-down moving mechanism for moving the squeegee up and down, and a push-in amount adjusting device having a detection control means for restricting and controlling the squeegee's advance up-and-down moving interval by detecting the position of the lower edge of the squeegee. And a screen printing machine. 2. The pushing vertical movement mechanism has a stepping motor fixed to an upper portion of an adjusting pipe fixed to a squeegee joint block in a squeegee mechanism, and is freely slidable within the adjusting pipe to a squeegee adjusting bolt connected to a motor shaft of the stepping motor. 2. A squeegee joint plate for connecting a squeegee holder holding a squeegee is connected to an adjust block screwing out of a lower end of the adjust pipe by engaging an adjust ball screw connected to an adjust block which moves up and down. Screen printing machine. 3. The detection control means comprises a transmission type photoelectric sensor, one of which is a light projecting portion and the other of which is a light receiving portion.
Arrange one of the light emitting / receiving parts on either side of the squeegee unit in the running direction, and the other of the light emitting / receiving parts on the other side of the other side. 3. The squeegee unit is arranged so as to form a light detection path oblique to the traveling direction, and the height position of the light detection path is set to the lower edge position of the squeegee unit. Screen printing machine.